Dr
Helena Santos
(LIP)
21/07/2011 09:00
Parallel session talk
A wide research program provided by heavy ion collisions is ongoing at the Large Hadron Collider with the aim of studying the properties of QCD matter at extreme temperatures and densities. The large acceptance, high granularity and broad pseudorapidity coverage of the ATLAS Detector is well suited to perform detailed analyses on bulk phenomena, jets and leptonic probes. Measurements of these...
Joerg Behr
21/07/2011 09:00
Parallel session talk
Differential inclusive-jet cross sections have been measured in photoproduction for boson virtualities Q2 < 1 GeV2 with the ZEUS detector at HERA using an integrated luminosity of 300 pb-1. These cross sections have the potential to constrain the gluon density in the proton and the photon when included as input to fits to extract the proton parton distribution functions. A value of...
Alexander Kappes
(Humboldt-University Berlin / DESY)
21/07/2011 09:00
Dr
Fanrong Xu
(National Taiwan University)
21/07/2011 09:00
Flavour Physics and Fundamental Symmetries
Parallel session talk
New experiments under construction aim to push neutron electric dipole moment down by one to two orders of magnitude, to an eventual sensitivity of 10^{−28} e cm. The Standard Model would still be out of reach. However, there is renewed interest in the direct search for a possible fourth generation of quarks, which may carry sufficient CP violation for the baryon asymmetry of the Universe. We...
Artem Baghdasaryan
21/07/2011 09:15
Parallel session talk
Inclusive-jet, dijet and trijet differential cross sections have been measured in neutral current deep-inelastic ep scattering for exchanged boson virtualities 150 < Q2 < 15000 GeV2 with the H1 detector at HERA. The measurements are used to determine value of the strong coupling alpha_s(M_Z). Additionally, the production of jets is studied at low four momentum transfer squared $5 < Q2 < 100...
Dr
Peter Geltenbort
(Institut Laue-Langevin)
21/07/2011 09:15
Flavour Physics and Fundamental Symmetries
Parallel session talk
Due to their outstanding property to be storable and hence observable for long periods of time (several hundreds of seconds) in suitable material or magnetic traps, ultra-cold neutrons (UCN) with energies around 100 neV are an unique tool to study fundamental properties of the free neutron, like its beta-decay lifetime, its electric dipole moment and its wave properties.
The search for the...
Nicolas Houdeau
(LPTHE (CNRS - UPMC))
21/07/2011 09:30
We consider the problem of assigning a meaningful confidence
to uncertainty estimates of perturbative series. We analyse the assumptions
which are implicit in the conventional estimates made using renormalisation
scale variations. We then formulate a Bayesian model that, given equivalent
initial hypotheses, allows one to characterise a perturbative theoretical
uncertainty in a rigorous...
Shabnam Jabeen
(Brown University)
21/07/2011 09:30
We present studies of single top production using the D0 experiment. Single top events are selected with an isolated electron or muon missing transverse energy, two, three or four jets, with one or of them identified as originating from the fragmentation of $b$ quarks. From the cross section measurement we obtain new bounds on the Kobayashi-Maskawa $|V_{tb}|$ matrix element. A...
Yen-Jie Lee
(Massachusetts Institute of Technology)
21/07/2011 09:30
Parallel session talk
We will present results of the CMS experiment from PbPb collisions at $srqrt{s_{NN}}$ = 2.76 TeV, probing quark and gluon matter at unprecedented values of energy density. The CMS apparatus provides calorimetry, muon and tracking systems covering a large range in pseudorapidity, complemented by a flexible two-level trigger system. This allows us to study the production of jets, photons,...
Dr
Geza Zsigmond
21/07/2011 09:30
Flavour Physics and Fundamental Symmetries
Parallel session talk
The search for a permanent neutron electric dipole moment with ultracold neutrons (UCN) is one of the prominent experiments to test CP-violation at the low-energy precision frontier. Extensions to the SM can provide enough CP violation to accommodate for the observed baryon asymmetry of the universe, while at the same time predicting nEDM values in the range of 10^-26 to 10^-28 ecm. This is...
Dr
VIVIANA cavaliere
(CDF Collaboration, University of Illinois at Urbana Champaign)
21/07/2011 09:30
Parallel session talk
We present an updated study of the invariant mass and other kinematic distributions of jet pairs produced in association with a $W$ boson using data collected with the CDF detector utilizing an integrated luminosity of $\sim$ 7~fb$^{-1}$. The distributions are compared in detail to the Standard Model predictions.
Dr
Hans Pieter Mumm
(NIST)
21/07/2011 09:45
Flavour Physics and Fundamental Symmetries
Parallel session talk
We have measured the D-coefficient in the triple correlation of the neutron spin with proton and electron momenta by observing coincidences in the decay of polarized neutrons. A non-zero value of D can arise due to parity-even-time-reversal-odd interactions that imply CP violation due to the CPT theorem. (Final-state effects also contribute to D at the level of 1e-5 and can be calculated with...
Keith Jarid Rose
21/07/2011 09:45
We present inclusive jet and dijet cross-section measurements in proton-proton collisions at a center-of-mass energy of 7 TeV at the CERN LHC, using the 2010 data collected by the CMS experiment. The data are compared to NLO pQCD predictions and are found to be in good agreement.
Dr
Jadranka Sekaric
(University of Kansas)
21/07/2011 09:45
Parallel session talk
We present a study of the dijet invariant mass spectrum in events with at least two jets produced
in association with a $W$ boson, using data collected with the D0 detector which correspond
to an integrated luminosity of 4.3 fb$^{-1}$. We perform a detailed comparison of the observed
distribution with the background prediction, taking into account systematic uncertainties, to
check the...
Dr
Apostolos Tsirigotis
(Physics Laboratory, School of Science and Technology, Hellenic Open University)
21/07/2011 09:45
KM3NeT ($km^3$ Neutrino Telescope) will be one of the world’s largest particle detectors, built at the bottom of the Mediterranean Sea, providing a window for the observation of the Universe through high energy neutrinos. KM3NeT will complement the South Polar IceCube neutrino telescope in its field of view and significantly surpass it in sensitivity and discovery potential. The underwater...
Dr
Boris Hippolyte
(IPHC Strasburg)
21/07/2011 10:00
Parallel session talk
ALICE (A Large Ion Collider Experiment) is the LHC experiment specifically designed to study QCD matter under extreme conditions of temperature and pressure. The aim is to study the Quark-Gluon Plasma obtained with high energy nucleus-nucleus collisions and to characterize its properties. Results from the ALICE experiment for sqrt(s_NN)=2.76 TeV Pb-Pb collisions will be presented and compared...
Prof.
Panagiotis Kokkas
(University of Ioannina - Greece)
21/07/2011 10:00
We present measurements sensitive to QCD multijet production using data from proton-proton collisions at sqrt(s) = 7 TeV collected with the CMS detector at the CERN LHC. The hadronic event shapes, the dijet azimuthal decorrelation and the ratio of the 3 jet to 2 jet production cross-sections confront the QCD multijet dynamics at a previously unexplored kinematic regime. The data are compared...
Dr
Grégory MOREAU
(LPT/Orsay)
21/07/2011 10:00
Parallel session talk
The last decade of particle physics beyond the Standard Model has seen extensive developments on an alternative to supersymmetry: the scenarios with warped extra dimensions. Those constitute a new paradigm in the sense that they are dual, through the AdS/CFT correspondence, to composite Higgs models. These scenarios predict strong deviations from the Standard Model mainly in the bottom and top...
Prof.
Guey-Lin Lin
(Institute of Physics, National Chiao-Tung University)
21/07/2011 10:00
The determination of neutrino flavor transition mechanism by
neutrino telescopes is presented. We first propose a model-independent parameterization for flavor transitions (such as standard three-flavor oscillations, neutrino decays or others)of astrophysical neutrinos propagating from their sources to the Earth. We demonstrate how one can constrain parameters
of the above parameterization...
Mme
Aleksandra Adametz
21/07/2011 10:00
Flavour Physics and Fundamental Symmetries
Parallel session talk
We report recent BABAR results in tau physics, including a search for CP violation in tau -> Ks0 pu nu, a search for second class currents in the process tau -> K/pi eta nu, and discuss recent results of exclusive branching fraction measurements related to V_us.
Alberto Orso Maria Iorio
(stituto Nazionale di Fisica Nucleare (INFN))
21/07/2011 10:10
We present a measurement of the inclusive single top production cross
section in proton-proton collisions at the LHC at a centre-of-mass
energy of 7 TeV, using data collected with the CMS experiment during
the year 2011. The analysis considers decay channels where the W from
the top decays into electron-neutrino or muon-neutrino, and makes
use of kinematic characteristics of electroweak...
Thorsten Kuhl
21/07/2011 10:15
Parallel session talk
We summarize the analysis of events with top, top-like and diboson final states in pp collision data recorded with the ATLAS detector. The data are compared to the Standard Model predictions with the goal of searching for new phenomena, e.g. searches for anomalous top-quark production and decay in several channels, including a search for top-quark pair production with anomalous missing...
M.
Paolo Francavilla
(Universita' di Pisa)
21/07/2011 10:15
Single and multiple et cross sections have been measured in proton-proton collisions at a centre-of-mass energy of 7 TeV using the ATLAS detector. The anti-kt algorithm is used to identify jets. Inclusive single-jet differential cross sections are presented as functions of jet transverse momentum and rapidity. Dijet cross sections are presented as functions of dijet mass and angle. The...
Henrik Melbéus
(Royal Institute of Technology (KTH))
21/07/2011 10:15
We discuss experimental signatures of non-minimal Kaluza-Klein dark matter. In the minimal Universal Extra Dimensions model, there is a unique possible dark matter candidate, the first Kaluza-Klein excitation of the U(1) gauge boson B. On the other hand, in non-minimal models, allowing for general boundary localized terms, the mass spectrum is different, and such models allow for other dark...
Dr
Kiyoshi Hayasaka
(Nagoya University)
21/07/2011 10:15
Flavour Physics and Fundamental Symmetries
Parallel session talk
We report results of a search for tau lepton decays strongly suppressed
in the Standard Model based on the world-largest data sample
accumulated with the Belle detector at the KEKB asymmetric-energy
e+e- collider. The decays include: lepton flavor and lepton number
violating tau decays into a lepton (e or mu) and two charged mesons
(K or pi), lepton flavor violating decays into a...
Eugenia Puccio
21/07/2011 11:00
Flavour Physics and Fundamental Symmetries
Parallel session talk
We present recent BABAR results on charmless hadronic B decays. In particular, we measure the branching fractions, longitudinal polarization fraction f_L and charge asymmetry in B -> rho(f_0) K* events, and report results of studies of B -> phi phi K and B0->K+pi-pi0. We also present the results of a recent study of the inclusive branching fractions of B-meson decays to charmless final...
Dr
Christian Schwanenberger
(University of Manchester)
21/07/2011 11:00
We present measurements of the inclusive top quark pair production
cross section in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV
utilizing data collected with the D0 detector at the Fermilab Tevatron Collider. Results for the lepton (e or mu)+jet, dilepton, tau+jet and fully hadronic decay modes are provided. We also present a measurement of the forward-backward charge asymmetry in top...
Dr
Peter Svoisky
(University of Oklahoma)
21/07/2011 11:00
We present the first measurement of the inclusive three-jet differential
cross section as a function of the invariant mass of the three jets
with the largest transverse momenta in an event in
$p\bar{p}$ collisions at $\sqrt{s}=1.96\, \mathrm{TeV}$.
The measurement is made in different rapidity regions
and for different jet transverse momentum requirements
and is based on a data set...
Dr
Jose Guilherme Milhano
(CENTRA-IST, Lisbon & CERN PH-TH)
21/07/2011 11:00
Parallel session talk
The LHC offers unprecedented opportunities to study the jets produced in heavy ion collisions. The release of the first LHC heavy ion data on jets has been accompanied by a surge of related theoretical activity. These recent efforts have focused on the identification and development of necessary ingredients to promote and complement the existing theoretical formulations, originally developed...
Kai Yi
21/07/2011 11:00
Parallel session talk
We present results of a number of searches for new physics in all-hadronic final state using pp data at the center-of-mass energy of 7 TeV collected with the CMS detector at the LHC in 2010 and 2011. The sought signals include monojet production in models with large extra dimensions, high-mass resonances decaying in ttbar pairs in all-hadronic decay channel, microscopic black holes, quark...
Dr
Simone Alioli
(DESY)
21/07/2011 11:15
I will review recent developments and applications of the POWHEG method, to merge NLO calculations with Shower Monte Carlo programs,
in the POWHEG-BOX framework. Particular emphasis will be given to
comparisons with LHC data and on the implementation of new processes.
M.
Denis Derkach
21/07/2011 11:15
Flavour Physics and Fundamental Symmetries
Parallel session talk
We report on the study of the decay B+ ->D0(D0bar) K+ where the D0 or D0bar decaying to Kpipi0, with the Atwood Dunietz and Soni (ADS) method. We measure the ratios Rads, R+, and R- that, since the processes B+ -> D0barK+ and B+ -> D0K+ are proportional to Vcb and Vub, respectively, are sensitive to rB and to the weak phase gamma. We also report the results of CP violation studies of B->Dcp...
Adam Gibson
21/07/2011 11:20
Parallel session talk
We summarize the analysis of events with jets in the final state in pp collision data recorded with the ATLAS detector. The data are compared to Standard Model predictions with the goal of searching for new phenomena: heavy resonances, contact interactions and gravitationally-mediated effects in large extra dimensions, including gravitational scattering and quantum micro-black holes.
Dr
Corinne Berat
(LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut Polytechnique de Grenoble)
21/07/2011 11:30
Authorship: The Pierre Auger Collaboration
The Pierre Auger Observatory is measuring the ultra-high energy cosmic ray extended air showers from simultaneous observation of fluorescence and surface detectors with unprecedented precision. The high statistics of the surface detector allows a good determination of the cosmic ray flux above an energy of 3 EeV. This bound is extended down to 1 EeV...
Dr
Jeremy Dalseno
(MPI, Munich)
21/07/2011 11:30
Flavour Physics and Fundamental Symmetries
Parallel session talk
We present a time-dependent measurement of CP violation parameters
in $B^0 \to \pi^+\pi^-$ decays.
We present also a measurement of the branching fraction of
$B^0 \to \rho^0 \rho^0$ decays,
which could provide a tighter constraint of the CKM angle $\phi_2$.
In addition we present measurements of branching ratios of other
charmless $B$ decays into 4 charged pions.
We present a...
M.
Raz Alon
(Weizmann Institute of Science)
21/07/2011 11:30
We present a study of the substructure of jets with transverse momentum greater than 400 GeV/c produced in proton-antiproton collisions
at a center-of-mass energy of 1.96 TeV at the Fermilab Tevatron Collider and recorded by the CDF II detector.
We measure for the first time the distributions of the jet mass, angularity and planar flow in a 5.95/fb data sample.
The observed substructure...
Dr
Chris Pinkenburg
(BNL)
21/07/2011 11:30
Parallel session talk
The PHENIX Experiment at the Relativistic Heavy Ion Collider of the Brookhaven National Laboratory has been taking data for over 10 years. The accumulated data sets span multiple beam energies and collision systems that provide an increasingly detailed picture of the hot and dense medium produced in central heavy ion collisions. I will summarize our latest results and give an outlook of our...
Christos Leonidopoulos
(FNAL)
21/07/2011 11:40
Parallel session talk
We present the results of a search for non-resonant signal for new physics in leptonic and photonic final states in pp collisions at 7 TeV collected with CMS in 2010 and 2011. These include searches for W'(lv), first and second generation leptoquarks, large extra dimensions in dilepton and diphoton channel, quark-lepton compositeness, anomalies in the transverse momentum of the leptonically...
Dr
Paoti Chang
(NTU, Taipei)
21/07/2011 11:45
Flavour Physics and Fundamental Symmetries
Parallel session talk
We report the measurements of branching fractions and direct $CP$
asymmetries
for neutral $B$ meson decays to the $hh$ final states, where $h$ stands
for
a pion or a kaon. We also study the charged $B$ meson decays into one
charged and one neutral kaon or pion.
We present improved measurements of the branching fraction and the $CP$
asymmetry of $B\to\eta h$. Here $h$ denotes...
Prof.
Zoltan Trocsanyi
(University of Debrecen)
21/07/2011 11:45
Parallel session talk
We introduce a twiki page with collections of generated event samples at LHC energies including a heavy quark-antiquark pair. These samples are generated with the POWHEG method and can be used to preparedistributions at the NLO accuracy with first radiation treated according to the parton shower approach. The event files are stored according to the Les Houches accord and standard parton...
Haris, for the Pierre Auger Collaboration Lyberis
(Institut de Physique Nucléaire d'Orsay, Università degli Studi di Torino, Université Paris VII Denis Diderot)
21/07/2011 11:45
We report on the analysis of the distribution of the arrival directions of ultra high energy cosmic rays detected at the Pierre Auger Observatory. From $2.10^{17}~$eV to $3.10^{19}~$eV, we present the results of searches for first harmonic modulations in the right-ascension distribution of cosmic rays and discuss the obtained upper limits which constitute the most stringent bounds at present...
Tetiana Hryn'ova
(LAPP)
21/07/2011 12:00
Parallel session talk
Studies of leptons and photons at the Large Hadron Collider are some of the most direct and sensitive ways to search for new phenomena. We present the results based on data collected with the ATLAS detector at the LHC and discuss current sensitivities and future discovery prospects.
Dr
Hernan Wahlberg
(IFLP - Universidad Nacional de La Plata)
21/07/2011 12:00
Authorship: The Pierre Auger Collaboration
The mass composition of ultra-high energy cosmic rays is a critical issue to understand their origin and nature. The Pierre Auger Observatory is a hybrid instrument which
provides a powerful environment for the determination of the primary mass, being able to discriminate between photons, neutrinos and hadrons. Results on limits of photon
and...
David Miller
21/07/2011 12:00
Parallel session talk
The internal properties of jets are sensitive to fragmentation and QCD radition. Jet substricture may
be used to indentify the decays of boosted hadronically decaying particles. Measurements of jets shapes,
of single-jet mass, of charged particle multiplcitites, and of some key substructure variables are presented
and compared to QCD calculations.
Dr
Michael Mitrovski
(STAR Collaboration)
21/07/2011 12:00
Parallel session talk
For almost 30 years, hadron production in heavy ion collisions has been an important observable for probing the state of nuclear matter. Mapping out the phase diagram of strongly interacting matter is a challenging open task in quantum chromodynamics (QCD). The goal of the RHIC $Beam$ $Energy$ $Scan$ program (BES) is to study the phase diagram of strongly interacting matter to search for the...
Dr
Andreas Scharf
(SUNY Buffalo)
21/07/2011 12:00
I want to discuss the next-to-leading order QCD
corrections to the production of a top-quark pair in association
with a hard photon. This process allows a direct measurement
of the top quark electromagnetic couplings.
For a realistic description of this process we incorporated top quark and W-boson decays using the narrow width approximation. Photon radiation off top quark decay products...
Dr
Michael Joseph Morello
(INFN and University of Pisa)
21/07/2011 12:00
Flavour Physics and Fundamental Symmetries
Parallel session talk
We present the updated analysis of Bd, Bs , and Lambda_b decays into
charmless two-body
final states using 6/fb of data collected by the CDF experiment.
We report the first evidence for
the pure-annihilation decay Bs->pi^+pi^- and improved limits
on the Bd->K+K- branching ratio.
We also report the first measurement of branching fractions
and CP-violating asymmetries
of ...
Dr
Leonardo Vernazza
(Johannes-Gutenberg-Universität)
21/07/2011 12:15
Extending previous results obtained in arXiv:0903.1126, we perform a diagrammatic analysis of the anomalous-dimension matrix of n-jet operators in SCET, investigating for possible new structures arising at 4 loop.
Dr
takeo Higuchi
(KEK, Tsukuba)
21/07/2011 12:15
Flavour Physics and Fundamental Symmetries
Parallel session talk
Using the large data sample collected at the $\Upsilon(4S)$
resonance with the Belle detector
at the KEKB asymmetric-energy $e^+e^-$ collider,
we present an improved measurement of time-dependent CP violation
in the neutral $B$ decays into charmonium and $K^0$.
CPT is expected to be a fundamental symmetry with no significant
deviations.
Nonetheless we can introduce an artificial...
Dr
Paolo Camarri
(University of Roma "Tor Vergata" and INFN Roma Tor Vergata)
21/07/2011 12:15
The ARGO-YBJ detector, located 4300 m a.s.l. on the Tibet plateau, is a ground-based, full-coverage array of Resistive Plate Chambers (RPCs) covering a surface of 78 x 74 m^2, surrounded by a guard ring of RPCs enclosing a total surface of about 11000 m^2. ARGOYBJ was designed to detect extensive air showers generated by cosmic rays and gamma rays with primary energy greater than few hundred...
Jordan Tucker
21/07/2011 12:20
Parallel session talk
We discuss the results of searches for narrow resonances decaying into pairs of leptons, photons, or jets, using pp collisions at 7 TeV delivered by LHC and collected with the CMS detector in 2010 and 2011. These include searches for Z' bosons, RS gravitons, dijet resonances, and excited leptons.
Andreas von Manteuffel
(University of Zurich)
21/07/2011 12:20
At LHC, top-quark pair production is an important process to test the
Standard Model and search for new physics. I discuss an analytical approach to the virtual corrections at NNLO in QCD. Some technical details will be given for the methods employed in the calculation.
Prof.
Alessia Tricomi
(University and INFN Catania)
21/07/2011 12:30
The LHCf experiment is a double arm sampling calorimeter, installed +/-140 m away from the Atlas LHC interaction point. The detectors allow precise measurement of energy and impact point of the neutral particles (mainly photons and neutrons) produced very forward
in the LHC proton-proton interactions, in the pseudorapidity region greater than 8; this measurement is crucial for the...
M.
Francesco D'Eramo
(MIT)
21/07/2011 12:30
Parallel session talk
The propagation of hard partons through the strongly interacting matter
created in high energy heavy-ion collisions involves widely separated
scales. The methods of Effective Field Theories (EFT) can provide a
factorized description at lowest nontrivial order, and a formalism where
the correction to this factorization are calculable systematically order
by order in the small ratios...
M.
Angelo Carbone
21/07/2011 12:30
Flavour Physics and Fundamental Symmetries
Parallel session talk
Temporary : merging of (abstracts 380,386,396)
The relative abundances of the three decay modes B0 -> DK, B0 -> Dπ and Bs ->Dsπ produced
in 7 TeV pp collisions at the LHC are determined from data corresponding to an integrated luminosity
of ∼35 pb−1. The relative branching ratio of B0 -> DK with respect to B0 -> Dπ is found to be
B(B0 ->DK) = (2.01 \pm 0.18 stat \pm 0.12 syst ) x...
Ignazio Scimemi
(Univ. Complutense de Madrid)
21/07/2011 12:30
Soft-Collinear Effective Theory (SCET) has been in covariant gauges. We argue that SCET, as it stands, is not capable to define in a gauge invariant way certain non-perturbative matrix elements that are an integral part of many factorization theorems. Those matrix elements involve two quark or gluon fields separated not only in light-cone direction but also in the transverse one. This...
Jie Chen
21/07/2011 12:35
Parallel session talk
Several models of new physics, including split supersymmetry, predict the existence of a heavy particle, which is long-lived on timescales of the bunch spacing of the LHC. We present the results of several searches for these particles, using various experimental techniques, from out-of-time decays in the CMS calorimeter to use of highly displaced vertices, timing, and dE/dx techniques. We...
Ben Pecjak
(Johannes Gutenberg-Universitaet Mainz)
21/07/2011 12:40
Techniques and results concerning soft gluon resummation at the level
of total and differential cross sections
in top-quark pair production at hadron colliders are presented.
In particular, the theoretical framework underlying resummation
at NLO+NNLL level for differential cross sections is briefly review,
and the consequences for observables such as the total inclusive
pair-production...
Dr
Cristina Carloganu
(LPC Clermont Ferrand)
21/07/2011 12:45
Their capability to penetrate through large depths of material renders high-energy atmospheric muons a unique probe for geophysical studies. Provided the topography is known, the measurement of the attenuation of the muon flux permits a cartography of density distributions revealing spatial and possibly also temporal variations.
A Collaboration between volcanologists, astroparticle- and...
Dr
Roman Planeta
(Institute of Physics Jagiellonian University)
21/07/2011 12:45
Parallel session talk
This presentation will summarize status and plans of the NA61/SHINE ion program.
The NA61/SHINE at the CERN SPS facility is the successor of the former NA49 experiment.
The study of central Pb+Pb collisions by NA49 indicate that the threshold for
deconfinement is reached already at the low SPS energies. Theoretical considerations predict
that SPS accelerator will cover one of the most...
M.
Alberto Lusiani
21/07/2011 12:45
Flavour Physics and Fundamental Symmetries
Parallel session talk
The study of B_{u,d,s} and D decays at SuperB can provide both
stringent constraints on new physics scenarios, and over constraints on
the CKM description of quark mixing and CP violation in the Standard
Model. The rich landscape of new physics sensitive observables
in both tree dominated and loop or flavor changing neutral current
rare decays complements measurements possible at...
Dr
Aidan Robson
(Glasgow University)
21/07/2011 12:50
We report on a search for heavy resonances decaying into pairs
of Z bosons using 6fb^-1 of ppbar collisions at sqrt(s)=2TeV
collected by CDF.
The analysis explores three final states corresponding to decays
of Z pairs into four charged leptons, two charged leptons plus
neutrinos, and two charged leptons plus jets.
The results of the search are interpreted in the framework of
theoretical...
Prof.
Sudeshna Banerjee
(Tata Institute of Fundamental Research)
21/07/2011 14:30
Parallel session talk
We report on a search for charged massive long-lived particles (CMLLPs), based on 5.2 fb$^{-1}$ of data collected
with the D0 detector at the Fermilab Tevatron $p\bar{p}$ collider. CMLLPs are predicted in many theories of physics
beyond the Standard Model. We look for events in which one or more particles are reconstructed as muons
but have speed and ionization energy loss $dE/dx$...
Shiraz Habib
21/07/2011 14:30
Parallel session talk
The inclusive single differential cross section $d\sigma/dQ2$ and the reduced double differential cross section $\tilde{\sigma}(x,Q2)$ are presented for neutral and charged current processes, $e^{\pm}p \rightarrow \nu X$, in interactions with longitudinally polarised lepton beams using the complete HERA-II data set. The cross sections are measured in the region of large negative four-momentum...
Dr
Javier L. Albacete
(Universidade de Santiago de Compostela)
21/07/2011 14:30
Parallel session talk
I will present a brief review of the different approaches to the description of bulk particle production in heavy ion collisions at RHIC and the LHC, with emphasis in the Color Glass Condensate approach (CGC). In the CGC approach coherence effects are taken into account through non-linear QCD renormalization group equations and also in the use of semi-classical methods appropriate at high...
Dr
Teresa Marrodán Undagoitia
(Universität Zürich)
21/07/2011 14:30
Dr
Andreas Crivellin
(ITP Bern)
21/07/2011 14:30
Flavour Physics and Fundamental Symmetries
Parallel session talk
In this talk I review the consequences of radiative flavour violation in the MSSM. Since self-energies can be chirally enhanced and therefore of order one it is possible to generate the light-quark masses and the CKM matrix via loops. In the case of CKM generation in the down-sector constraints from b->s gamma, and in the case of CKM generation in the up-sector from epsilon_K, are observed. In...
Vladimir Chekelian
21/07/2011 14:45
Parallel session talk
A combination of the inclusive cross sections measured by the H1 and ZEUS Collaborations in neutral and charged current deep-inelastic ep scattering at HERA is presented. The combination uses data from unpolarised ep scattering taken during the HERA-I phase as well as measurements with longitudinally polarised electron or positron beams from the HERA-II running period. The combination method...
Prof.
Dhiman Chakraborty
(Northern Illinois University)
21/07/2011 14:45
Parallel session talk
We present two searches involving final states with top quarks or with
topologies similar to those observed in top quark decays. The first is a search
for the pair production of a fourth generation $t'$ quark and its antiparticle,
followed by their decay to a W boson and a jet, based on an integrated
luminosity of 5.3 fb$^{-1}$ of $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV.
The second...
Dr
David Straub
(Scuola Normale Superiore, Pisa)
21/07/2011 14:45
Flavour Physics and Fundamental Symmetries
Parallel session talk
Rather than sticking to the full U(3)^3 approximate symmetry normally invoked in Minimal Flavour Violation, we analyze the consequences on the current flavour data of a suitably broken U(2)^3 symmetry acting on the first two generations of quarks and squarks. A definite correlation emerges between the mixing amplitudes in the K, B_d and B_s systems, which can resolve the current tension in the...
Dr
Remi Louvot
(EPFL, Lausanne)
21/07/2011 15:00
Flavour Physics and Fundamental Symmetries
Parallel session talk
Using fully reconstructed $B_{s}$ mesons, we measure the
branching fractions for the decays of $B_s \to
D_s^{(*)+}D_s^{(*)-}$ exclusively. Assuming these decay modes
saturate decays to CP-even final states, the branching fraction
determines the relative width difference between the $CP$-odd and
$CP$-even $B_s$ states.
We study the decay $B^0_s\to J/\psi \phi$, $\phi \to K^+ K^-$. In...
Dr
Panos Christakoglou
(NIKHEF)
21/07/2011 15:00
Parallel session talk
Fluctuations of thermodynamic quantities are fundamental for the study of the QGP phase transition. Among the several observables calculated on an event-by-event basis, the different measures of the charge and mean transverse momentum fluctuations are of particular interest since they are considered to be indicators of the existence and of the order of this transition as well as of the...
Gianluca Petrillo
(University of Rochester)
21/07/2011 15:00
We report on measurements of the top quark mass using dilepton and lepton+jet data collected with the D0 detector. These results are compared to the top mass extracted from the $t\bar{t}$ cross section using higher-order quantum chromodynamics calculations. We also present a direct measurement of the mass difference between top and antitop quarks ($\Delta m$) in lepton+jets $t\bar{t}$ final...
M.
Hayk Pirumov
(PI Heidelberg)
21/07/2011 15:00
Parallel session talk
New results on searches at HERA with the H1 Experiment are presented.
Jules Gascon
(Universite de Lyon, Universite Lyon 1, CNRS/IN2P3)
21/07/2011 15:00
EDELWEISS is a direct search for WIMP dark matter using cryogenic heat-and-ionization germanium detectors. We report the final results of the second stage of the experiment, EDELWEISS-II, obtained with an array of ten 400 g detectors equipped with interleaved electrodes for the rejection of surface events. Limits on the elastic and inelastic cross-sections of spin-independent interactions of...
Paul Laycock
21/07/2011 15:15
Parallel session talk
In 2004, the H1 Collaboration at HERA installed the Very Forward Proton Spectrometer (VFPS) located at 220m from the interaction point, in the cold section of the proton ring. The spectrometer consists of two Roman Pot stations equipped with scintillating fiber detectors. The device allows the measurement of diffractive proton momentum in the range 0.009 < xpom < 0.025, where xpom is the...
Mme
Cecilia Maiano
(University of Milano Bicocca and INFN, Sezione di Milano-Bicocca)
21/07/2011 15:15
The Cryogenic Underground Observatory for Rare Events (CUORE) is an
experiment to search for neutrinoless double beta decay in
Te-130 and other rare processes. CUORE is a bolometric detector
composed of 988 TeO2 crystals, with the total mass of about 1 tonne.
The large detector mass, low backgrounds, and the low energy threshold
of a few keV make the experiment well suited for direct...
Dr
Sergey Burdin
(University of Liverpool)
21/07/2011 15:15
Flavour Physics and Fundamental Symmetries
Parallel session talk
We report a new measurement of the $CP$-violating phase $\phi_s$,
of the decay width difference for the two mass eigenstates $\Delta
\Gamma_s$, of the mean $B^0_s$ lifetime $\overline{\tau}_s$, and of
magnitudes of the decay amplitudes, from the flavor-tagged decay
$B^0_s\to J/\psi \phi$. For the first time, we consider possible
contributions from the decay $B^0_s \rightarrow J/\psi...
Dr
Robert Pak
(Brookhaven National Laboratory)
21/07/2011 15:15
Parallel session talk
Measurement of anisotropic particle production transverse to the beam direction, referred to as collective flow, has provided a powerful tool for characterizing ultrarelativistic heavy-ion collisions. We will present recent results on higher-order flow harmonics for different particle species at various Au+Au collision energies measured with the PHENIX experiment at the Relativistic Heavy Ion...
Lorenzo Bellagamba
21/07/2011 15:15
Parallel session talk
Various channels were explored to look for physics beyond the
standard model.
A search for first generation leptoquarks as a unique signal for
new physics was augmented by searches for unnaturally large number
of events in channels where the number of events predicted in the SM
is small. Such a channel is the production of single top.
Another such channel is the production of tau...
Guennadi Borissov
21/07/2011 15:30
Flavour Physics and Fundamental Symmetries
Parallel session talk
We present an improved measurement of the charge asymmetry $A$ of like-sign
dimuon events in 9 fb$^{-1}$ of $p\overline{p}$ collisions recorded with the
D0 detector at a center-of-mass energy $\sqrt{s} = 1.96$ TeV at the
Fermilab Tevatron collider. From $A$, we extract the like-sign dimuon
charge asymmetry in semileptonic $b$-hadron decays. We also study the
dependence of charge asymmetry...
Philippe Di Stefano (and the CDMS Collaboration)
(Department of Physics, Queen's University)
21/07/2011 15:30
The CDMS experiment is a search for dark matter employing subkelvin germanium detectors. A dual phonon-ionization measurement allows to reject the dominant radioactive background. We present results from CDMS and progress towards SuperCDMS. We will also report the result of a joint analysis of CDMS and EDELWEISS data.
Dr
Amanda Deisher
(UCLA/ETH)
21/07/2011 15:30
We present measurements of various differential cross sections in top
pair production in proton-proton collisions at the LHC at a
centre-of-mass energy of 7 TeV. We use data collected by the CMS
experiment during the year 2011. Cross sections are measured
differentially as a function of various variables.
We also present a measurement of the charge asymmetry in top-pair
production. In...
Prof.
David d'Enterria
(CERN)
21/07/2011 15:30
Isolated prompt photon production in proton-(anti)proton collisions proceeds mostly through quark-gluon Compton scattering [1] and has been proposed since long to directly constrain the gluon distribution in the proton. There exist 25 pT-differential measurements of isolated photon production at collider energies in the range sqrt(s)=0.2-7 TeV which are well reproduced by next-to-leading-order...
Dr
Michal Sumbera
(Nuclear Physics Institute ASCR)
21/07/2011 15:30
Parallel session talk
Three-dimensional source imaging techniques in conjunction with detailed model comparisons have shown the viability of disentangling the spatio-temporal information contained in two-pion interferometric
measurements from ultra-relativistic heavy ion collisions. This has led
to the observation of non-Gaussian tails in the 3D pion source function
and the extraction of finite pion emission...
M.
Christian Linn
21/07/2011 15:45
Flavour Physics and Fundamental Symmetries
Parallel session talk
The determination of the CP-violating phase $\phi_s$ in
$B^0_s \rightarrow J/\psi \phi$ decays is one of the key goals of the
LHCb experiment. Its value is predicted to be very small in the
Standard Model but can be significantly enhanced in many models of
new physics. To perform the first LHCb analysis of $\phi_s$ on 2010
data at a centre of mass energy of 7 TeV, many milestones...
Dr
Anne-Isabelle ETIENVRE
(CEA-DAPNIA)
21/07/2011 15:45
We present a measurement of the top-quark mass in proton-proton collisions at =
7 TeV with the ATLAS detector at the Large Hadron Collider. The top mass is
extracted directly in the single lepton channel with template methods and
indirectly from the measurement of the production cross-section.
Dr
Roberto Preghenella
(INFN Bologna)
21/07/2011 15:45
Parallel session talk
The measurement of identified charged hadron production at mid-rapidity (|y| < 0.5) performed with the ALICE experiment is resented for PbPb collisions at a nucleon-nucleon c.m. energy of 2.76 TeV. The transverse momentum spectra of charged pions, kaons, protons and antiprotons are measured from 200 MeV/c up to 3 GeV/c for pions and kaons and from 400 MeV/c up to 5 GeV/c for protons and...
M.
Alexander Khodjamirian
(Siegen University)
21/07/2011 16:30
Flavour Physics and Fundamental Symmetries
Parallel session talk
I will report on the QCD calculation of the hadronic matrix elements
relevant for the exclusive rare $B$ decays, such as
$B\to K^{(*)}\ell^+\ell^-$ and $B\to K^*\gamma$.
The hadronic input for the decay observables,
in addition to the heavy-light form factors,
contains specific contributions, generated by the four-quark
and penguin operators, such as the charm-loop effects....
Dr
Yvonne Pachmayer
(University of Heidelberg)
21/07/2011 16:30
The measurement of heavy flavour production in proton-proton collisions at the LHC allows to study the production mechanisms and to test perturbative Quantum Chromodynamics at a new energy domain. Furthermore, it will provide important reference for investigations of medium effects in Pb-Pb collisions, where charm and beauty are regarded as a good probe for parton-medium interaction dynamics....
Torsten Bringmann Bringmann
(Hamburg University)
21/07/2011 16:30
The self-annihilation, or decay, of dark matter particles could result in significant contributions to cosmic ray fluxes of various kinds, providing a unique opportunity to detect dark matter by means other than through its gravitational interaction. A wealth of observational data, both existing and upcoming, makes these indirect detection channels ever more interesting.
I review the various...
M.
Jihun Kim
(Seoul National Univerity)
21/07/2011 16:30
Parallel session talk
We introduce a jet shape observable, N-subjettiness, that helps to discriminate the fat jet from a highly boosted color singlet particle decaying to N partons and the QCD jet. As an illustration, a toy scheme for the light Standard Model Higgs search via fully hadronic decay channels from `pp -> H W/Z' is suggested. Issues regarding the subjet definition as required by the N-subjettiness are...
M.
Karolos Potamianos
(Purdue University)
21/07/2011 16:30
We present the recent results of top-quark physics using up to 8fb-1 of ppbar collisions analyzed by the CDF collaboration. The large number of top quark events analyzed, of the order of several thousands, allows stringent checks of the Standard Model predictions. Also, the top quark is widely believed to be a window to new physics. We will present the latest measurements of top quark...
Benoit Blossier
(CNRS)
21/07/2011 16:45
Flavour Physics and Fundamental Symmetries
Parallel session talk
Precision tests of the Standard Model as well as several New Physics
scenarios in the beauty flavour physics are possible, due to the large amount of experimental data already available now and to come in the future. While the theoretical uncertainty is limiting the significance of such tests, lattice QCD offers a powerful approach to compute the necessary non-perturbative hadronic...
M.
Thibault Guillemin
(LAPP)
21/07/2011 16:45
Parallel session talk
We present the result of measurements of the cross sections for the simultaneous
production of two vector bosons ($WW$, $WZ$, $ZZ$) in lepton plus jets decays at
a center-of-mass energy of $\sqrt{s}=1.96$ TeV using data collected with the
CDF and D0 detectors at the Fermilab Tevatron. We then present the results of
searches for the $WZ$ or $ZZ$ production where one ot the bosons...
Dr
Dmitri Melikhov
(HEPHY, Vienna & SINP, Moscow)
21/07/2011 17:00
Flavour Physics and Fundamental Symmetries
Parallel session talk
We present the sum-rule extraction of the decay constants of the D, Ds, B, and Bs mesons from the two-point correlator of heavy-light pseudoscalar currents. We use the OPE of this correlator in terms of the running heavy-quark mass, for which the perturbative expansion exhibits a reasonable convergence. Our main emphasis is laid on the control over the uncertainties in the decay constants,...
Dr
Tzvetalina Stavreva
(LPSC)
21/07/2011 17:00
Parallel session talk
We present a detailed phenomenological study of the associated production of a prompt photon and a heavy quark jet (charm or bottom) in proton-nucleus (p-A) and nucleus-nucleus (A-A) collisions. The dominant contribution to the cross-section comes from the gluon--heavy-quark (gQ) initiated subprocess, making this process very sensitive to the gluon and the heavy-quark nuclear parton densities....
Dr
Marco Regis
(University of Turin and INFN)
21/07/2011 17:00
In most of particle dark matter (DM) models, the DM candidate injects sizable fluxes of high-energy electrons and positrons through its annihilations or decays. Emitted in regions with magnetic field, they in turn give raise to a synchrotron radiation, which typically covers radio and infrared bands. We discuss the possibility of detecting signatures of Galactic and extra-galactic DM in the...
Boris Tuchming
(Saclay)
21/07/2011 17:00
Parallel session talk
We present the result of searches for the Standard Model Higgs boson produced
via the $H\to W W^{(*)}\to\ell^+\ell'^-$ ($\ell,\ell'=e,\mu,\tau$) process at
a center-of-mass energy of $\sqrt{s}=1.96$ TeV with the CDF and D0 detectors
at the Fermilab Tevatron collider. A Higgs particle with a mass greater than
140 GeV decays primarily into a pair of $W$-bosons and the leptonic...
Alessandro Cerri
21/07/2011 17:15
Flavour Physics and Fundamental Symmetries
Parallel session talk
The ATLAS B physics program relies on exclusive decays, in particular involving a J/\psi.
ATLAS capabilities to reconstruct the properties of D-mesons and B-hadrons
in exclusive decay modes will be demonstrated and prospects for future
measurements highlighted.
Dr
Diego Stocco
(Subatech)
21/07/2011 17:15
Parallel session talk
The ALICE experiment studies the properties of the QCD matter at the extreme energy densities of the ultra-relativistic heavy-ion collisions at the LHC. Produced on a very short time-scale in the initial hard-scattering processes, the heavy quarks (charm and beauty) experience the whole collision evolution: measuring the open heavy flavour spectra allows to investigate the mechanisms of...
Mlle
Jelena Aleksić
(IFAE)
21/07/2011 17:15
MAGIC is a ground-based system of two, 17 m diameter Imaging Atmospheric Cherenkov Telescopes (IACT) located in the Canary island of La Palma. MAGIC-I has been operational since 2004 and it already achieved the lowest energy threshold among the current generation of IACTs. In 2009 it was joined by MAGIC-II, and together, in the stereoscopic mode, they allow for the observations of...
Prof.
Svjetlana Fajfer
(Institute Jozef Stefan and Ljubljana University)
21/07/2011 17:15
The most general new physics effective operators in the decay of an unpolarized top quark into a bottom quark and a W gauge boson are considered at next-to-leading order in QCD. We find that the dipole operator O_{LR} contribution to the transverse-plus W helicity fraction F_+ is significantly enhanced compared to the leading order result at non-vanishing bottom quark mass. Nonetheless,...
Dr
Antonio Limosani
(University of Melbourne)
21/07/2011 17:20
Parallel session talk
We present the result of searches for the Standard Model Higgs boson at
the Tevatron in channels which provide additional sensitivity in the high
mass region. These include specialized searches for the $H\to W W^{(*)}\to\ell^+\ell'^-$
associated production with a $W$ or a $Z$ boson, resulting in three-leptons
final states, searches for the $H\to W W^{(*)}$ decay in final states with
2...
Prof.
Antoni Szczurek
(Rzeszow University and Institute of Nuclear Physics PAN)
21/07/2011 17:30
We discuss the central exclusive production of Higgs boson
and $q\bar{q}$ pairs in proton-proton (proton-antiproton) collisions
at LHC and Tevatron.
The amplitude for both processes is derived within the $k_t$-factorization
approach and discussed in different kinematical asymptotia.
In particular, we consider important high-$p_t$ and massless quark
limits for $q \bar q$...
Dr
Guillaume Lambard
(IFIC)
21/07/2011 17:30
Using the ANTARES neutrino telescope, the largest neutrino telescope in the Northern hemisphere, with its first configuration with 5 lines of photodetectors to the actual nominal one corresponding to a total of 12 lines, we have studied our ability to search indirectly for an evidence of Dark Matter annihilations in heavy astrophysical objects as the Sun and the Galactic centre. First results...
Alexander Grohsjean
(CEA Saclay Irfu/SPP)
21/07/2011 17:30
A number of results on the production and decay properties of top quark are presented. Results include a study of spin correlations in ttbar production, a search for favor changing neutral currents in top decays, a measurement of color-flow in ttbar events and a measurement of the W boson helicity.
M.
Christopher Powell
(Lawrence Berkeley National Laboratory)
21/07/2011 17:30
Parallel session talk
The production of quarkonium has been studied to provide information
about the hypothesized Quark Gluon Plasma (QGP) that is expected to be
created in relativistic heavy ion collisions at RHIC. Lattice QCD
predicts a suppression of quarkonium production in the presence of a hot
and dense medium relative to proton-proton collisions, with the
suppression pattern of the various quarkonium...
M.
Manuel Franco Sevilla
21/07/2011 17:30
Flavour Physics and Fundamental Symmetries
Parallel session talk
We present recent results of studies of semileptonic B and charm
decays from BABAR. In particular, we describe a recent measurement of
the B-> D(*)tau nu branching fraction, and a study of Bs production and semileptonic decays using BABAR data collected above the Upsilon(4S).
We also discuss the determination of |Vub| from exclusive B->pi/rho l nu and and from fully inclusive...
Prof.
Stefan Dittmaier Dittmaier
(University of Freiburg)
21/07/2011 17:35
Parallel session talk
Higgs strahlung off W/Z bosons at Tevatron and the LHC, ppbar/pp -> WH/ZH,
is an important process class for discovering a light Higgs boson. In the
talk, first results on electroweak (and QCD) corrections for these
reactions are shown that support the full differential information
and the decays of the W/Z bosons, i.e. the actually considered
processes are ppbar/pp -> l nu H / l l H. The...
Olena Bachynska
21/07/2011 17:45
Parallel session talk
The production of D*+, D0, D+, D+_s and lambda_c+ charm hadrons in ep scattering at HERA was measured with the ZEUS detector using the full HERA II data sample. The measurement has been performed in the photoproduction regime. The fractions of c quarks hadronising as a particular charm hadron, f(c-> D,lambda_c) were derived and are compared
to the previous HERA results and to those obtained...
M.
Livio Bianchi
(INFN Torino - Universita' di Torino)
21/07/2011 17:45
Parallel session talk
ALICE is the experiment dedicated to heavy-ion studies at the LHC and, in particular, it aims at a comprehensive study of the hot and dense colour-deconfined state of matter called Quark-Gluon Plasma.
Quarkonia resonances are considered as powerful probes of the deconfined phase since the heavy quark pairs pairs are produced in the early stages of the collision and their bound states are very...
Dr
Fei-Fan Lee
(National Chiao Tung University)
21/07/2011 17:45
The deployment of DeepCore array significantly lowers IceCube’s energy threshold to about 10 GeV and enhances the sensitivity of detecting neutrinos from annihilations and decays of light dark matter. To match this experimental development, we provide a complete analysis of track and cascade event rates in DeepCore array due to neutrino flux produced by annihilations and decays of galactic...
M.
Alessandro Gaz
21/07/2011 17:45
Flavour Physics and Fundamental Symmetries
Parallel session talk
We report on recent results of measurements of hadronic B decay branching fractions from BABAR. These results include B0->D(*)0h0 (where h0 is a neutral hadron), B->D(*)D(*)K, B->D(*)ppbar and B->D(*)0Ks0.
Karolos Potamianos
21/07/2011 17:50
Parallel session talk
We present the result of searches for a low mass Standard Model Higgs boson produced in association with a $W$
or a $Z$ boson at a center-of-mass energy of $\sqrt{s}=$1.96~TeV with the CDF and D0 detectors at the Fermilab
Tevatron collider. The search is performed in events containing one or two $b$-tagged jets in association with
either two leptons, or one lepton and an imbalance in...
Dr
Phillip Urquijo Urquijo
(University of Bonn)
21/07/2011 18:00
Flavour Physics and Fundamental Symmetries
Parallel session talk
We report a search for $B$ decays into invisible final states.
The signal is identified by fully
reconstructing the accompanying $B$ meson and requiring no other
charged particles and no extra energy deposited in the calorimeter.
The upper limit obtained will be reported and the corresponding
physics will be discussed.
We report measurements of the $B \to D_{s}^{(*)} K \ell \nu$ decay...
Andreas Meyer
21/07/2011 18:00
Parallel session talk
Measurements of cross sections for events with charm and beauty jets in deep inelastic scattering with the H1 detector at HERA are presented. The numbers of charm and beauty jets are determined using variables reconstructed using the H1 vertex detector with which the impact parameters of the tracks to the primary vertex and the position of secondary vertices are measured. The measurements are...
Oscar Adriani
(University of Florence and INFN Sez. di Firemze)
21/07/2011 18:00
The PAMELA satellite-borne experiment was launched from the Bajkonur cosmodrome in June 2006. The combination of a permanent magnet silicon strip spectrometer and a silicon-tungsten imaging calorimeter allows precision studies of the charged cosmic rays to be conducted over a wide energy range with high statistics.
After five years of successfully operation in space, the data gathered by the...
Pamela Ferrari
21/07/2011 18:00
We present results on top quark decay properties using data collected in 7 TeV
LHC proton-proton collisions with the ATLAS detector, including W boson
polarisation in top quark decays and the search for FCNC in decays of top
quarks.
Mme
Catherine Silvestre
(LPSC, UIC, LANL (now LPSC, work done with UIC and LANL))
21/07/2011 18:00
Parallel session talk
CMS is fully equipped to measure hard probes in the di-muon decay channel in the high multiplicity environment of nucleus-nucleus collisions. Such probes are especially relevant for studying the quark gluon plasma since they are produced at early times and propagate through the medium, mapping its evolution. Quarkonia and bottomonia are sensitive to the evolution of the medium. In particular,...
Azeddine Kasmi
21/07/2011 18:10
Parallel session talk
Although the sensitivity to a low mass Standard Model Higgs boson at the Fermilab Tevatron is highest for channels
involving the $H\to b\bar{b}$ decay, other channels contribute significantly to the combined Higgs search. We
report the results of searches for the Higgs boson in the diphoton final state using up to 8.5~fb$^{-1}$ of
integrated luminosity collected by the CDF and D0 detectors...
M.
Mykhailo Lisovyi
(DESY)
21/07/2011 18:15
Parallel session talk
The production of charm and beauty quarks in deep inelastic scattering has been measured with the ZEUS detector using the full HERA II data set. The charm and beauty contents in events with a jet were determined using the decay length significance and invariant mass of inclusive secondary decay vertices. Differential cross sections as functions of Q2, Bjorken x, E_T^jet and eta^jet were...
Mme
Marina Artuso
21/07/2011 18:15
Flavour Physics and Fundamental Symmetries
Parallel session talk
In a data sample corresponding to ∼36 pb−1 of pp collisions at a centre-of-mass energy sqrt(s) = 7 TeV,
we make the first observation of the decay Lambda_b -> Lambda_c+Ds- and measure its branching fraction
relative to that of Lambda_b -> Lambda_c+π-. We also present related measurements of B hadron decays.
In a data sample corresponding to ∼36 pb−1 of pp collisions at a centre-of-mass...
767.
Production of lepton, quark and meson pairs in peripheral ulrarelativistic heavy ion collisions
Prof.
Antoni Szczurek
(Rzeszow University and Institute of Nuclear Physics PAN)
21/07/2011 18:15
Parallel session talk
We discuss exclusive production of lepton-antilepton,
quark-antiquark, $\pi \pi$ and $\rho^0 \rho^0$ and $D \bar D$ meson
pairs in ultraperipheral, ultrarelativistic
heavy-ion collisions i.e. processes initiated by photon-photon
fusion which could be studied at RHIC and LHC.
The cross sections for exclusive muon pair production
in nucleus - nucleus collisions was calculated...
Gianluca Cerminara
(CERN)
22/07/2011 09:00
Fast and efficient methods for the calibration and the alignment of the detector are a key asset to exploit the physics potential of the CMS detector.
The CMS experiment has set up a powerful framework for alignment and calibration, which is based on dedicated skims providing a highly compact dedicated input for the various workflows computing the constants. This includes a prompt...
Dr
Luis Silva
(LIP Lisbon)
22/07/2011 09:00
One of the missing keys in the present understanding of the spin structure of the nucleon is the contribution from the gluons: the so-called gluon polarisation. This quantity can be determined in DIS through the Photon-Gluon Fusion (PGF) process, in which two analysis methods may be used: (i) identifying open charm events or (ii) selecting events with high-p_T hadrons. The data used in the...
Dr
Philippe Brax
(CEA-Saclay)
22/07/2011 09:00
Parallel session talk
Despite more than 10 years of intense experimental and theoretical work, no plausible explanation to the acceleration
of the universe is available yet. Dark energy and modified gravity are two likely candidates. I will review their current status and state the problems that they both face. In particular, it turns out that at low energy both approaches reduce to scalar field models...
amarjit soni
(BNL)
22/07/2011 09:00
Flavour Physics and Fundamental Symmetries
Parallel session talk
Adding another generation to the Standard Model is just about the simplest extension available to us; yet it has profound consequences.While there are many motivations for it, it appears now that the data from B-factories is very difficult to reconcile with the CKM-paradigm with just three families. Addition of a new family is just about the simplest way to address these difficulties. That...
Ia Iashvili
(SUNY Buffalo), Dr
Manfred Krammer
(HEPHY, Vienna)
22/07/2011 09:15
We present results on the jet energy calibration and jet transverse momentum resolution at CMS. In-situ measurements are performed using couple of 100/pb of proton-proton collisions at 7 TeV center of mass energy. The transverse momentum balancing in dijet and photon/Z+jet events is used to measure the jet energy response in the CMS detector, as well as the transverse momentum resolution. The...
Dr
Joel Jones-Perez
(INFN - LNF)
22/07/2011 09:15
Flavour Physics and Fundamental Symmetries
Parallel session talk
The current run of the LHC experiment shall be able to probe gluino and squark masses up to values of about 1 TeV. Assuming that hints for SUSY are found by the end of this run, we explore the flavour constraints on the parameter space of the CMSSM, with and without massive neutrinos. In particular, we focus on decays that might have been measured by the time the run is concluded, such as...
Adrian Buzatu
22/07/2011 09:30
Parallel session talk
We present the combination of the searches for the Standard Model Higgs boson at a
center-of-mass energy of $\sqrt{s}=$1.96~TeV, using up to 8.9~fb$^{-1}$ of data
collected with the CDF detector at the Fermilab Tevatron collider. The major
contributing processes include associated production ($WH\to \ell\nu bb$, $ZH\to\nu\nu bb$,
$ZH\to \ell\ell bb$, and $WH\to WWW^{(*)}$) and gluon...
Dr
Frank Nerling
(University of Freiburg)
22/07/2011 09:30
The COMPASS experiment at CERN SPS is dedicated to the study of hadron structure and spectroscopy. One goal of the physics programme using hadron beams is the search for new states, in particular the search for J^{PC} spin-exotic states and glueballs. Apart from a short pilot run in 2004 (190 GeV/c negative pion beam, lead target), we started our hadron spectroscopy programme in 2008 by...
Dimitri Bourilkov
(University of Florida)
22/07/2011 09:30
Measurements of inclusive W, Z and Drell Yan production cross sections and the W lepton charge asymmetry in pp collisions at 7 TeV center-of-mass energy, based on data recorded by the CMS detector at thE LHC in 2010 and 2011 are presented. The measurements are performed in the electron and muon channels. The charge asymmetry measurements cover the central region up to 2.4 in lepton pseudo...
M.
Vincent Hedberg
(Lund University)
22/07/2011 09:30
A precision luminosity measurement is of critical importance for the ATLAS physics program, both for searches for new physics as well as for precision measurements of Standard Model cross-sections. The calibration of the luminosity is based on three so-called van der Meer scans that were performed in 2010.
The calibration determines the convolved beam sizes in the vertical and horizontal...
M.
Maurizio Martinelli
22/07/2011 09:30
Flavour Physics and Fundamental Symmetries
Parallel session talk
We report recent BABAR charm physics results, including CP violation studies in D+->Ks0pi+ and D+ ->Ks0 h+h+h-, a study of the Dalitz plot of Ds+->K+K-pi+, measurements of the mass and width of the Ds1(2536)+, measurements of charm semileptonic and leptonic branching fractions, and searches for non-hadronic rare D decays.
sebastien greder
(IPHC)
22/07/2011 09:45
Parallel session talk
We present the combination of the searches for the Standard Model Higgs boson at a
center-of-mass energy of $\sqrt{s}=$1.96~TeV, using up to 8.5~fb$^{-1}$ of data
collected with the D0 detector at the Fermilab Tevatron collider. The major
contributing processes include associated production ($WH\to \ell\nu bb$, $ZH\to\nu\nu bb$,
$ZH\to \ell\ell bb$, and $WH\to WWW^{(*)}$) and gluon fusion...
Dr
Marko Staric
(Jozef Stefan Institute)
22/07/2011 09:45
Flavour Physics and Fundamental Symmetries
Parallel session talk
We report a measurement of $D^0$ - $\bar D^0$ mixing in
$D^{0} \to K_S^0 \pi^{+} \pi^{-}$ decays using a time-dependent Dalitz
plot analysis.
We will also present an updated measurement of the mixing parameter
$y_{CP}$ in decays $D^0 \to K^+K^-$ and $D^0 \to \pi^+\pi^-$.
We will present a measurement to search for $CP$ violation in charged
$D$ meson decays by measuring the...
Emilie Passemar
(IFIC-University of Valencia)
22/07/2011 09:45
Recently, an important effort has been devoted at KLOE, MAMI and COSY to precisely measure the eta --> 3 pi decays. These new measurements require to revisit the theoretical analyses of these decays. In this talk, we will present a new analysis of the eta --> 3 pi decay amplitude relying on dispersive methods. We will show how the study of this decay allows to extract a fundamental parameter...
Dr
Delphine Hardin
(LPNHE)
22/07/2011 09:45
Parallel session talk
We present the recent results from the analysis of the Supernova Legacy Survey 3-years data sample.
For the dark energy equation of state, assuming a flat universe, we measure a w parameter consistent with a cosmological constant
with a precision of 0.2. We have paid particular attention to the systematic uncertainties.
We combine the SNe data with baryon acoustic oscillation measurements...
M.
Matthew Charles
22/07/2011 10:00
Flavour Physics and Fundamental Symmetries
Parallel session talk
LHCb has collected a large sample of open charm events in the 2010 run. Indirect CP violation in charm is an excellent probe for new physics due to the smallness of the standard model predictions. Preliminary measurements of mixing parameters and searches for CP violation in the time-dependence of two-body charm decays are presented. The prospects of improving the sensitivity of these...
Dr
Martin van Beuzekom
(Nikhef)
22/07/2011 10:00
The status and performance of the LHCb detector during the physics LHC physics run is described. The detector has a number of notable features including: 13 micron resolution in the transverse plane on 25 track primary vertices, pion and kaon separation from 1 to 100 GeV, and 1 MHz full readout of all sub-systems. The detector is being operating above its design luminosity. The detector is...
Dr
Dmitri Melikhov
(HEPHY, Vienna, Austria & SINP, Moscow, Russia)
22/07/2011 10:00
We study the pion elastic and the pi-gamma transition form factors at large values of the momentum transfers making use of the existing experimental data and two theoretical approaches: (i) the local-duality QCD sum rules and (ii) quantum-mechanical potential models with an interaction consisting of Coulomb and confining parts in which case the ground-state form factors satisfy factorization...
Dr
Fabrice Couderc
(CEA/DAPNIA/SPP)
22/07/2011 10:00
Parallel session talk
We present searches for Higgs bosons in final states with $b$-quarks and/or taus
at a center-of-mass energy of $\sqrt{s}=$1.96~TeV using up to 8.5~fb$^{-1}$ of data
collected with the D0 detector. In Supersymmetric models the Higgs boson production
cross section can be significantly enhanced compared to the Standard Model, and in
such models the Higgs boson has a significant branching...
Dr
Federico Nguyen
(INFN Roma TRE),
Paolo Gauzzi
(Universita' degli Studi "La Sapienza" and Sezione INFN "Roma")
22/07/2011 10:15
The KLOE experiment has collected 2.5 fb-1 at the peak of the phi resonance at the e+e- collider DAPHNE in Frascati. The whole data set includes 100 million eta's produced through the radiative decay
phi --> eta gamma and tagged by means of the monochromatic recoil photon. Measurements of eta decay channels, such as pi+ pi- gamma, are in progress. We have also measured the branching ratio of...
M.
FLORENT LACROIX
(UIC/FERMILAB)
22/07/2011 10:15
In this talk we report comprehensive results of studies of missing transverse energy (MET) measured by the CMS detector in pp collisions at a centre-of-mass energy of 7 TeV. Three MET reconstruction algorithms are deployed for various physics analyses. The scale and resolution for MET are validated using vector boson and dijet events, and severe mismeasurements due to the detector are studied....
Yuriy Onishchuk
22/07/2011 10:15
Flavour Physics and Fundamental Symmetries
Parallel session talk
The production of the excited charm mesons D1(2420)0 and D*2(2460) in ep
collisions was measured with the ZEUS detector at HERA using an integrated
luminosity of 373 pb-1. The masses, widths and helicity parameters of these
resonances were determined and compared with previous measurements, with
theoretical expectations and with published ZEUS results of an independent
sample with an...
Aruna Kumar NAYAK
(LIP, Lisbon, Portugal)
22/07/2011 10:15
Parallel session talk
We present results from a search for an exotic Higgs Boson in the channel H++ --> l+l+ with the CMS detector using data accumulated in the 2010 & 2011 running of the LHC at sqrt s = 7 TeV. We also present results from a search for a charged Higgs Boson in ttbar decays in the channel H+ -> Tau nu with the CMS detector using data accumulated in the 2010 & 2011 running of the LHC at sqrt s = 7 TeV
Dr
Jean-Loic Kneur
(LCC Montpellier)
22/07/2011 11:00
A recent extension of a variationally optimized perturbation method, combined with renormalization group properties in a straightforward way, can provide a series of approximations to nonperturbative quantities such as the chiral symmetry breaking order parameters. We apply this to evaluate, up to the third order in this modified perturbation, the ratio F_\pi/\Lambda_MS
where F_\pi is the...
Ryan Reece
(University of Pennsylvania)
22/07/2011 11:00
Differential and inclusive cross sections for electroweak boson production are presented, in the electron,
muon and tau decay channels. The data are compared to the predictions of next-to-leading-order and, where
available, next-to-next-leading order QCD.
Martin Flechl
22/07/2011 11:00
Parallel session talk
The search for the neutral Higgs boson(s) beyond the Standard Model is presented,
based on the ATLAS data collected in 2011. A wide region of the MSSM parameter
space is tested via searches for Higgs decays into two tau-leptons. Additionaly,
the obtained results are interpreted in terms of the exclusion limits for the
Standard Model-like Higgs boson production.
The experimental...
Eugeni Grauges
22/07/2011 11:00
Flavour Physics and Fundamental Symmetries
Parallel session talk
We present recent BABAR results of searches for rare decays with new physics sensitivity. In particular, we present the results of searches for B -> gammma gamma and the lepton and baryon number violating modes
B->Lambda(c)l and B->K/pi tau l. We also describe recent searches for the charm decays D-> Xl+l-, D0 -> gamma gamma and D0->l+l-.
Dr
Christophe Yeche
(IRFU-SPP / CEA-Saclay)
22/07/2011 11:00
Parallel session talk
The SDSS-III Baryon Oscillation Spectroscopic Survey (BOSS), a five-year spectroscopic survey of 10,000 deg^2, achieved first light in late 2009. One of the key goals of BOSS is to measure the signature of baryon acoustic oscillations in the distribution of Ly-alpha absorption from the spectra of a sample of ~150,000 z>2.2 quasars. Along with measuring the angular diameter distance at...
Simone Gennai
(CERN/INFN)
22/07/2011 11:15
Parallel session talk
We present results from a search for the Higgs Boson in the channel H --> Tau Tau with the CMS detector using data accumulated in the 2010 & 2011 running of the LHC at sqrt s = 7 TeV
Dr
Martha Constantinou
(University of Cyprus)
22/07/2011 11:15
We present results on the nucleon electromagnetic/axial form factors,
as well as the lower moments of the nucleon generalized parton
distributions, within lattice QCD using two dynamical flavors
of degenerate twisted mass fermions. Our simulations are performed on lattices with three different values of the lattice spacings, namely
a=0.089 fm, a=0.070 fm and a=0.056 fm, allowing...
Thomas Kuhr
22/07/2011 11:15
Flavour Physics and Fundamental Symmetries
Parallel session talk
We report the latest results of a CDF search for B->mumu decays
using 6.9/fb of data.
Doubled statistics with respect to the previous iteration and several
analysis improvement provide
results that are the most sensitive from a single-experiment to date.
M.
Dario Barberis
(Genoa University/INFN)
22/07/2011 11:30
The ATLAS experiment is taking data steadily since Autumn 2009, collecting
close to 1 fb-1 of data (several petabytes of raw and reconstructed data
per year of data-taking). Data are calibrated, reconstructed, distributed
and analysed at over 100 different sites using the World-wide LHC
Computing Grid and the tools produced by the ATLAS Distributed Computing
project.
In addition to...
Ricardo Goncalo
22/07/2011 11:30
Parallel session talk
The decay of the Standard Model-like Higgs boson into bb is the dominant decay
process in the region of low Higgs boson masses. The Higgs search in this channel
requirese an associated heavy object, allowing for strong discrimination from the
dominant multi-jet background processes. We present the status of the Higgs searches
in the H->bb channel based on the ATLAS data collected so far in 2011.
Urs Langenegger
(PSI)
22/07/2011 11:30
Flavour Physics and Fundamental Symmetries
Parallel session talk
The rare decays B_{s,d}->mumu provide an excellent test of the flavor sector of the Standard Model with sensitivity to many new physics models. We report on a search for these decays with the CMS experiment using data collected until Summer 2011.
Jean Wicht
22/07/2011 11:45
Parallel session talk
We report the observation of the $h_b(1P)$ and $h_b(1P)p$ spin-singlet bottomonium states produced in the reaction $e^+e^-\to h_b(1P)n\pi^+\pi^-$ with significances of $5.5\,\sigma$ and $11.2\,\sigma$, respectively. We find that $M[h_b(1P)]=(9898.25\pm 1.06^{+1.03}_{-1.07})\,\mathrm{MeV}/c^2$ and $M[h_b(1P)p]=(10259.76\pm0.64^{+1.43}_{-1.03})\,\mathrm{MeV}/c^2$, which correspond to...
Marumi Kado
22/07/2011 11:45
Parallel session talk
The search for the Standard Model-like Higgs boson decaying to two photons
is one of the best ways to identify a low mass Higgs boson at LHC. The results
of the search in this channel are presented, based on the ATLAS data collected
in 2011 and giving sensitivity exceeding any currently reported. The detailed
analysis of the background contributions is included.
Mme
Justine Serrano
22/07/2011 11:45
Flavour Physics and Fundamental Symmetries
Parallel session talk
Review of the search for the very rare decays $B^{0}_{s} \rightarrow \mu^+ \mu^-$ and $B^{0} \rightarrow \mu^+ \mu^-$ with the LHCb experiment is presented. These decays are suppressed within the Standard Model as they can only occur via helicity suppressed loop diagrams. However, their amplitudes can be significantly different in many New Physics scenarios, especially in those with an...
Prof.
Michael Drinkwater
(University of Queensland)
22/07/2011 11:45
Parallel session talk
The WiggleZ Dark Energy Survey on the Anglo-Australian Telescope has measured redshifts for 220,000 emission line galaxies. The galaxies sample a volume of 1 cubic Gpc and a redshift range of 0.2<z<1. This is the first survey to measure the cosmology of the universe over such a wide range of epochs. Our analysis provides strong evidence that dark energy is real.
In our first major...
Dr
Paolo VALENTE
(INFN Roma1),
Riccardo Fantechi
(INFN Pisa and Cern)
22/07/2011 12:00
The NA62 experiment at CERN aims at the very challenging task of measuring with 10% relative error the Branching Ratio of the ultrarare decay of the K+ into pi+ neutrino and antineutrino, which is expected to occur only in about 8 out of 10^11 kaon decays. This will be achieved by means of an intense hadron beam, an accurate kinematical reconstruction and a redundant veto system for...
Daniele del Re
(Universita' "Sapienza" & INFN Rome)
22/07/2011 12:00
Parallel session talk
We present results from a search for the SM Higgs Boson in the channel H --> Gamma Gamma with the CMS detector using data accumulated in the 2010 & 2011 running of the LHC at sqrt s = 7 TeV
Dr
Christoph Bobeth
(TU München - IAS/Excellence Cluster Universe, Germany)
22/07/2011 12:00
Flavour Physics and Fundamental Symmetries
Parallel session talk
The final data sets of BaBar, Belle and CDF as well as the current run
of LHCb are about to significantly improve the experimental knowledge
on rare $B$-decays governed by b -> s l^+l^-$. In view of this, we
will present new tests of the electroweak short-distance couplings in
the Standard Model and beyond, including a general set of non-standard
interactions. Especially, the angular...
Mlle
Monika Grothe
(Univ. of Wisconsin)
22/07/2011 12:05
We present studies of the associated production of jets with vector bosons in pp collisions at 7-TeV center-of-mass energy at the LHC, based on data recorded by the CMS detector at the LHC in 2010 and 2011. The jet multiplicity distributions are efficiency corrected and unfolded. The studies extend to the measurement of b-jets in association with Z bosons, and of charm-jets in association with...
Dr
Sébastien Descotes-Genon
(LPT Orsay)
22/07/2011 12:15
Flavour Physics and Fundamental Symmetries
Parallel session talk
The Wilson coefficient C_7 governing the radiative electromagnetic decays of B meson has been calculated to a very high accuracy in the Standard Model, but till date there is no convincing model-independent experimental bound on either the magnitude or the sign of C_7. In the present paper, we attempt at constraining both the magnitude and sign of C_7 using a systematic approach. We consider...
Konstantinos Nikolopoulos
22/07/2011 12:15
Parallel session talk
The search for the Standard Model-like Higgs boson via its decays into two Z bosons
is presented, based on the ATLAS data collected in 2011. The results obtained in the
fully leptonic 'golden' decay channel cover a wide range of Higgs boson masses.
Above 200 GeV, the sensitivity is highly improved using channels in which one of the
Z bosons decays into neutrinos or hadrons. The good...
Dr
Maurizio Bonesini
(INFN Milano Bicocca)
22/07/2011 12:15
The International Muon Ionization Cooling Experiment (MICE) will carry out a systematic investigation of ionization cooling of a muon beam, for the future Neutrino Factory and the Muon Collider. As the emittance measurement will be done on a particle-by-particle basis, a sophisticated beam instrumentation is needed to measure both particle coordinates and timing vs RF in a harsh environment...
Dr
Dominique Rebreyend
(LPSC/CNRS-IN2P3/UJF)
22/07/2011 12:30
Parallel session talk
The GRANIT project is the follow-up of the pionnering experiments that first observed the quantum states of neutrons trapped in the earth’s gravitational field at the Institute Laue Langevin (ILL) [1]. Due to the weakness of the gravitational force, these quantum states exhibit most unusual properties: peV energies and spatial extensions of order 10 m. Whereas the first series of...
Collaboration KLOE-2
(LNF-INFN), Dr
Dario Moricciani
(INFN - Sez. Roma "Tor Vergata")
22/07/2011 12:30
The KLOE experiment at the DAFNE e+e- collider of the Frascati
Laboratories of INFN is about to start a second data-taking campaign (KLOE-2). The interaction region of DAFNE has been modified using a crabbed waist scheme.
The KLOE-2 scientific program aims to further improve the precision studies on kaon and low energy hadron physics, e.g. CKM unitarity and lepton universality, CPT...
Dr
Hideki Miyake
(KEK, Tsukuba)
22/07/2011 12:30
Flavour Physics and Fundamental Symmetries
Parallel session talk
We present updated measurements of branching fractions, polarization,
and muon forward-backward asymmetry in B-->K(*) mu mu final states using
6.7/fb of data collected by the CDF detector.
A search for Lambda_b --> Lambda mu mu decays will also be shown.
The results are the most sensitive from a single experiment to date.
Roberto Salerno
22/07/2011 12:35
Parallel session talk
We present results from a search for the SM Higgs Boson in the channels H -> ZZ -> 4l, 2l 2nu and 2l2j with the CMS detector using data accumulated in the 2010 & 2011 running of the LHC at sqrt (s) = 7 TeV
Mitesh Patel
22/07/2011 12:45
Flavour Physics and Fundamental Symmetries
Parallel session talk
The first LHCb measurements of the decay Bd->K*mumu will be presented. In particular, the forward-backward asymmetry, fraction of K* longitudinal polarisation and partial branching fraction as a function of the di-muon invariant mass squared will be shown from 309pb-1 of the 2011 data.
Dr
Johan Bregeon
(INFN-Pisa)
22/07/2011 12:45
The Large Area Telescope (LAT) is the main instrument onboard the Fermi Gamma-ray Space Telescope, an orbital observatory launched in low-Earth orbit on June 11 2008 to survey the high-energy gamma-ray sky. The LAT tracker/converter serves the twofold purpose of converting the incoming gamma-ray into an electron-positron pair and tracking the latter in order to measure the original photon...
Mlle
Anna Vinokurova
(Budker Institute)
22/07/2011 14:30
Flavour Physics and Fundamental Symmetries
Parallel session talk
We report results of a study of charmonium and X, Y, Z states
using the world-largest data sample accumulated with the Belle detector
at the KEKB asymmetric-energy e+e- collider. :
We present results from a study of $X(3872) \to J/\psi \pi^+ \pi^-$
decays produced in exclusive $B\to K \pi^+ \pi^- J/\psi$ decays
using the full Belle data set. We present new measurements of the...
Dr
Christian Reichardt
(Dept. of Physics, University of California, Berkeley)
22/07/2011 14:30
Parallel session talk
The South Pole Telescope (SPT) is a 10-meter telescope designed to survey the millimeter-wave sky. The telescope and its 960-element bolometric camera were successfully installed at the South Pole in 2007. Since then, the SPT has imaged 2200 square degrees of the sky with low noise and arcminute resolution. I will report on the CMB power spectrum results from SPT. In conjunction with data...
Dr
Gioacchino Ranucci
(INFN)
22/07/2011 14:30
Borexino is a massive, calorimetric liquid scintillator detector installed at the underground Gran Sasso Laboratory. With its unprecedented radiopurity levels achieved in the core of the detection medium, it is the only real time experiment in operation able to study solar neutrino interactions in the challenging sub-MeV energy region.
The recent precise measurement of the 7Be solar neutrino...
Jonas Strandberg
22/07/2011 14:30
Parallel session talk
The search for the Standard Model-like Higgs boson via its decays into two W bosons
is presented, based on the ATLAS data collected in 2011. The search in the dilepton
final state is more powerful than any public result for intermediate mass Higgs
bosons and has the highest sensitivity of any of the LHC Higgs searches. It is
complemented by semi-leptonic WW decays which give good...
M.
Dmytro Kovalskyi
(UCSB/CERN)
22/07/2011 14:45
Parallel session talk
We present results from a search for the SM Higgs Boson in the channel H -> WW -> 2l 2nu with the CMS detector using data accumulated in the 2010 & 2011 running of the LHC at sqrt s = 7 TeV. A Higgs signal in the Vector Boson Fusion channel, by exploiting the distinctive signature of the events, where the Higgs decay is accompanied by two high rapidity jets, is also presented.
Dr
Tomas Brauner
(Bielefeld University)
22/07/2011 14:45
Parallel session talk
We revisit the center-symmetric dimensionally reduced effective theory for two-color Yang-Mills theory at high temperature. This effective theory includes an order parameter for center symmetry breaking/restoration and thus allows to broaden the range of validity of the conventional three-dimensional effective theory (EQCD) to lower temperatures, towards the confining phase transition. We...
M.
Bilmis Selcuk
(Middle East Technical University, Ankara, Turkey)
22/07/2011 14:45
The ν̅e-e- elastic scattering cross-section was measured with a CsI(Tl) scintillating crystal array having a total mass of 187 kg. The detector was exposed to an average reactor neutrino flux of 6.4 × 1012 cm-2s-1 at the Kuo-Sheng Nuclear Power Station in Taiwan.
The experimental design, conceptual merits,detector hardware, data analysis and background understanding of the experiment will...
Dr
Evgeny Baldin
(Budker Institute)
22/07/2011 14:45
Flavour Physics and Fundamental Symmetries
Parallel session talk
We report results from the KEDR detector operating at the VEPP-4M electron-positron collider in the Budker Institute in Novosibirsk. They include: high-precision measurements of J/psi, psi' and tau lepton masses as well as determination of the main parameters of the psi(3770) resonance.
Raffaello D'Alessandro
(Università di Firenze INFN-Firenze)
22/07/2011 14:45
CMS started a campaign to identify the future silicon sensor technology baseline for a new Tracker for the high-luminosity phase of LHC, coupled to a new effective way of providing tracking information to the experiment trigger. To this end a large variety of 6” wafers was acquired in different thickness's and technologies at HPK and new detector module designs were investigated. Detector...
M.
Alessandro La Rosa
(University of Wisconsin)
22/07/2011 15:00
With the LHC collecting data at 7 TeV, plans are already advancing for a
series of upgrades leading eventually to about five times the LHC design
luminosity some 10 years from now in the high luminosity LHC (HI-LHC)
project. The upgrades for the ATLAS detector will be staged in preparation
for HI-LHC. The first upgrade for the pixel detector will be the
construction of a new pixel layer...
Dr
Kyle Cranmer Cranmer
(New York University)
22/07/2011 15:00
Parallel session talk
Combined ATLAS results on the Standard Model-like Higgs boson search are presented,
based on the ATLAS data collected in 2010 and 2011. Several Higgs boson decay
channels are combined: H->gammagamma, H->ZZ->4l, H->ZZ->llnunu, H->ZZ->llqq,
H->WW->lnulnu and H->WW->lnuqq in a mass range from 110 GeV to 600 GeV. Models with
a fourth generation of heavy leptons and quarks with Standard...
Prof.
Liaoyuan Dong
(Institute of High Energy Physics, Beijing)
22/07/2011 15:00
Flavour Physics and Fundamental Symmetries
Parallel session talk
In July 2008 the BESIII experiment in Beijing recorded the first hadronic event from e+e- collisions at the BEPCII storage ring. Since then over 100 million psi(2S) and over 200 million J/psi events, as well as a data sample corresponding to an integrated luminosity of about 2.9fb-1 at the psi(3770) resonance have been accumulated. This provides the opportunity to improve the precision on many...
Prof.
Hugh Gallagher
(Tufts University)
22/07/2011 15:00
Neutrino event generators play an important role in the design and execution of neutrino experiments. In this talk I will describe several programs that simulate neutrino-nucleus interactions in the 1-100 GeV energy regime, focussing in particular on a discussion of the underlying physics models and identifying key assumptions.
Christian Kiesling
(Max-Planck-Institute for Physics)
22/07/2011 15:15
With the completion of the first-generation experiments at asymmetric $e^+ e^-$ colliders (BaBar and Belle) studying CP violation in the B-meson system, a new era of high luminosity machines is at the horizon. We report here on the plans for future experiments on CP violation and searches for physics beyond the Standard Model at the upgraded KEKB machine in Japan (``SuperKEKB''), providing an...
Dr
Min-Zu Wang
(NTU, Taipei)
22/07/2011 15:15
Flavour Physics and Fundamental Symmetries
Parallel session talk
We report measurements of branching fractions and $CP$
violation asymmetries for $B\to \phi\phi K$ decays. Results of the study
of $B^{\pm}\to J/\psi K^{\pm}$ and $B^{\pm}\to\eta_C K^{\pm}$,
that result in a final state of five kaons, will also be presented.
We study the $B^-$ meson decays to the final state of $\overline{p}
\Lambda D^0$. The decay $B^-\to\overline{p}
\Lambda D^{*0}$...
Dr
Hagop Sazdjian
(IPN, Universite Paris-Sud 11, Orsay)
22/07/2011 15:15
Using an exact integrodifferential equation, the spectral properties of the gauge invariant quark two-point Green's function are analyzed in two-dimensional QCD in the large N_c limit. The singularities of the Green's function arise from contributions of the colored sector of quarks (here in the fundamental representation) and give information about their spectrum. The problem is solved...
Guillaume Hurier
(LPSC)
22/07/2011 15:15
Parallel session talk
The PLANCK mission will provide the most precise mesurement of the cosmic microwave background (CMB) anisotropies in temperature and polarization, allowing us to set tight constraints on the cosmological parameters. In addition, the PLANCK mission, because of its frequency coverage, is sensitive to the interaction of CMB photons and hot electrons in galaxy clusters via the thermal...
Andrey Korytov
22/07/2011 15:20
Parallel session talk
We report on the combined results from several searches for the SM Higgs boson conducted by the CMS experiment with the data accumulated during the 2010 & 2011 running of the LHC at sqrt(s) = 7 TeV.
Dr
Filippo Varanini
(INFN Padova)
22/07/2011 15:20
ICARUS-T600 is the first example of an innovative detection technology, the liquid Argon TPC, which
is a sort of "electronic bubble chamber", potentially scalable to huge masses.
The excellent topology reconstruction, tracking and particle identification capabilities,
together with the calorimetric measurement of deposited energy, make the LAr-TPC an ideal detector for
the study of rare...
Dr
auguste besson
(Institut Pluridisciplinaire Hubert Curien)
22/07/2011 15:30
CMOS Pixel Sensors (CPS) are foreseen to equip vertex detectors
where priority is given to granularity, material budget and power
consumption, potentially at the expense of read-out speed and
radiation tolerance. Being initially developed for an experiment
at the ILC, the sensors came out to be well suited to Heavy Ion
Collision experiments (STAR at RHIC, CBM at FAIR, ...) and...
Riccardo Brugnera
22/07/2011 15:30
Parallel session talk
The proton-dissociative diffractive photoproduction of J/psi mesons has been studied in ep collisions with the ZEUS detector at HERA using an integrated luminosity of 112 pb. The cross section is presented as a function of the photon-proton centre-of-mass energy and of the squared four-momentum transfer at the proton vertex. The results are compared to perturbative QCD calculations. The...
Dr
Daniele Fasanella
(INFN and University of Bologna)
22/07/2011 15:30
Flavour Physics and Fundamental Symmetries
Parallel session talk
A measurement of the ratio of X(3872) and \psi(2S) signal yields in pp collisions at 7 TeV is presented, using data recorded with the CMS experiment in 2010. The corresponding integrated luminosity is 36/pb. X and Psi(2S) decays are reconstructed in the final state $J/\psi \pi^+ \pi^-$, with the subsequent decay of the $J/\psi$ into two muons. The measured ratio is compared to theoretical...
Benjamin Audren
(EPFL)
22/07/2011 15:35
Parallel session talk
I will discuss the new numerical implementation in CLASS of two semi analytical methods for computing the matter power spectrum, namely the one-loop and Time Renormalization Group method. I will present our result compared against accurate N-body simulation and the halofit method on the BAO region. I will also discuss about the new implementation of the one-loop method, showing a great...
Dr
DUSINI Stefano
(Padova University and INFN)
22/07/2011 15:35
The OPERA neutrino detector built in the underground Gran Sasso Laboratory is designed to detect muon-neutrino to tau-neutrino oscillations in direct appearance mode. The hybrid apparatus consists of an emulsion/lead target complemented by electronic detectors. It is placed in the long-baseline CERN to Gran Sasso neutrino beam (CNGS) 730 km away from the source.
The experimental set-up and...
Dr
Matthias Schott
(CERN)
22/07/2011 15:40
Parallel session talk
In the global fit of the Standard Model using Gfitter, electroweak precision observables as well as constraints from direct Higgs searches are compared with state-of-the-art electroweak predictions. We use the most recent results for direct Higgs searches, including updates on precision measurements such as MW and mtop from Tevatron and LHC experiments. Moreover, the Gfitter results for the...
Harris Kagan
(The Ohio State University),
William Trischuk
(University of Toronto)
22/07/2011 15:45
Progress in experimental particle physics in the coming decade depends crucially upon the ability to carry out experiments at high energies and high luminosities. These two conditions imply that future experiments will take place in very high radiation areas. In order to perform these complex and perhaps expensive experiments new radiation hard technologies will have to be developed. ...
Dr
Peter Bussey
(University of Glasgow)
22/07/2011 15:45
Flavour Physics and Fundamental Symmetries
Parallel session talk
Using 4.2 fb^-1 of data collected by the displaced track trigger, we report the
observation of the Xi_b^- baryon
through its hadronic decay into a Xi_0c pi- final state and a measurement of its
mass.
In addition, we report the results of a search for the Xi_b^0 baryon.
Dr
Alexander Korzenev
(Universite de Geneve, Section de physique, DPNC)
22/07/2011 15:50
An overview of the recent NA61/SHINE results on determination of
charged kaon and pion yields in proton-carbon reactions is presented.
The results aim to improve predictions of the neutrino flux
in the T2K experiment. The data were recorded during the first
physics run of NA61 in 2007 where a proton beam of 31 GeV/c
momentum scattered off a graphite target. Thin target,
4% of a...
Dr
Luigi Pilo
(Department of Physics University of L'aquila)
22/07/2011 16:30
Parallel session talk
In GR the static gravitational potential of a self-gravitating body goes as 1/r at large distances and any slower decrease leads to infinity energy. We show that in a class of four-dimensional massive gravity theories there exists spherically symmetric solutions with finite total energy, featuring an asymptotic behavior slower than 1/r and generically of the form $r^\gamma$. This suggests that...
Ulrich Ellwanger
(LPT Orsay)
22/07/2011 16:30
Parallel session talk
We review possible properties of Higgs bosons which are
specific to the NMSSM as light CP-even scalars consistent with LEP
bounds, decays into a pair of light CP-odd scalars, and enhanced
branching ratios into two photons. The status of analyses to detect such
unconventionally decaying Higgs bosons is descussed.
Dr
Nazario Tantalo
(University of Rome "Tor Vergata")
22/07/2011 16:30
Flavour Physics and Fundamental Symmetries
Parallel session talk
I will review state of the art lattice calculations of hadronic matrix elements that play a role in flavour physics (decay constants, bag parameters, form factors parametrizing semileptonic decays) both for light and heavy flavoured mesons. I will also briefly discuss how the present accuracy on some of these quantities can eventually be improved by considering effects that have been neglected...
Ursula Bassler
(LPNHE-Paris)
22/07/2011 16:30
The diboson cross sections in the WZ,ZZ,Wgamma and Zgamma channels
are measured using data collected with by the D0 experiment.
The results are compared to SM predictions and constraints are set
on anomolous triple gauge couplings.
Dr
Anna M Holin
(University College London)
22/07/2011 16:30
MINOS is a long baseline neutrino oscillation experiment which utilises the NuMI muon neutrino beam from Fermilab. MINOS has two detectors, a Near Detector 1km from the beam source, and a Far Detector 735km away in the Soudan mine in Minnesota. New results from MINOS will be presented and discussed.
Vasily Mochalov
(IHEP,Protvino)
22/07/2011 16:30
PANDA is an experiment designed for the future FAIR facility at GSI to challenge our understanding of the strong interact ion and of hadronic matter. Exploiting the high luminosity and good quality of the cooled antiproton beam, PANDA will search for new forms of matter, namely for precise measurements of possible exotic states, such as glueballs, hybrids, pentaquarks etc. in the quark...
Amanda Cooper-Sarkar
22/07/2011 16:30
Parallel session talk
This talk will present a summary of QCD fits of H1 and ZEUS data to determine improved PDFs. The QCD fit analysis of the combined HERA-I inclusive deep inelastic cross sections has been extended to include combined HERA II measurements at high Q2. The precision of the PDFs at high-x is considerably improved - particularly in the valence sector. A preliminary NNLO QCD analysis is presented...
M.
Mikhail Danilov
(ITEP-Moscow)
22/07/2011 16:45
The CALICE collaboration has developed highly granular calorimeter prototypes to
evaluate technologies for experiments at a future lepton collider, and evaluated
their performance in test beams. One important use of these data is the
validation of the physics models in GEANT4, especially those related to hadronic
showers. This validation is crucial if Monte Carlo simulations are to...
Alberto Lusiani
22/07/2011 16:45
Parallel session talk
We present the results of direct searches for light new physics with BABAR. In particular, we describe studies of narrow Upsilon and B decays with sensitivity to possible light pseudoscalar Higgs bosons and invisibly decaying dark matter candidates. We also present results of searches for hidden sector gauge and Higgs bosons.
Dr
Osamu Seto
(Hokka-Gakuen University)
22/07/2011 16:50
We show that in a class of two Higgs doublet model, where one Higgs doublet generates masses of quarks and charged leptons whereas the other Higgs doublet with a tiny vacuum expectation value generates neutrino Dirac masses, large Yukawa couplings lead to a large enough CP asymmetry of the right-handed neutrino decay. Thermal leptogenesis suitably works at low energy scale as keeping no...
Dr
Claudio Giganti
(IFAE Barcelona)
22/07/2011 16:50
The T2K (Tokai to Kamioka) experiment is a long baseline neutrino oscillation experiment designed to probe the θ13 neutrino mixing parameter by looking for the appearance of νe in an almost pure νμ beam. The concurrent measurement of νμ disappearance allows refined measurements of the atmospheric Δm2 and of the θ23 mixing parameters. A neutrino beam is produced at the Japan Proton Accelerator...
Dr
Joachim Brod
(Excellence Cluster Universe, TU Munich)
22/07/2011 16:50
Flavour Physics and Fundamental Symmetries
Parallel session talk
Neutral Kaon mixing plays an important role in the phenomenology of the standard model and its extensions because of its sensitivity to high-energy scales. In this talk I will give a summary of the theory prediction of epsilon_K and Delta M_K and present our new NNLO QCD calculation of the charm-quark contribution eta_cc to the Delta S = 2 effective Hamiltonian.
Mlle
Jennifer Bowles
(University of Glasgow)
22/07/2011 17:00
Parallel session talk
The HERMES experiment at DESY, Hamburg used the HERA 27.6GeV electron/positron polarised beam to study the structure of the nucleon. Deeply Virtual Compton Scattering (DVCS) provides access to Generalised Parton Distributions via measured azimuthal asymmetries at HERMES. Data was collected from 1995 to 2007 with unpolarised and both longitudinally and transversely polarised gas targets (H, D...
Jamal Rorie
22/07/2011 17:00
Parallel session talk
We search for a CP-odd light Higgs among 102 M $\Upsilon(1S)$ events recorded with
the Belle detector at KEKB. Our signal mode is
$\Upsilon(1S)\to\gamma A_0;A_0\to \tau^+\tau^-$, where the $\tau$ is
detected via its leptonic decay modes. We determine the upper limits
on the production rates for a CP-odd light Higgs with a mass between
the $\tau^+\tau^-$ threshold and 9.4...
Matthieu MARIONNEAU
(SPP-IRFU CEA/Saclay)
22/07/2011 17:00
We present studies of diboson production in pp collisions at 7 TeV center-of-mass energy based on data recorded by the CMS detector at the LHC in 2010 and 2011. These include precise measurements of W and Z production in association with a photon and of WW production, as well as possible first observations of WZ and ZZ productions at the LHC. The results are interpreted in terms of constraints...
Dr
Evgueni Goudzovski
(University of Birmingham)
22/07/2011 17:05
Flavour Physics and Fundamental Symmetries
Parallel session talk
The results from the CERN kaon experiments are presented. A precision test of lepton universality by measurement of the helicity suppressed ratio of kaon leptonic decay rates BR(K --> e nu)/BR(K --> mu nu) has been performed with over 10^5 K+- --> e+- nu decays collected by the NA62 experiment in 2007-08. A record accuracy of 0.4% has been achieved, which constrains the parameter space of new...
Aurélien Barrau
(LPSC)
22/07/2011 17:10
Parallel session talk
Loop Quantum Gravity is a very attractive attempt to perform a non-perturbative and background-independant quantization of general relativity. Applied to the Universe as a whole, the resulting framework, Loop Quantum Cosmology (LQC) has led to several important results beginning by the fact that the Big Bang singularity is resolved and replaced by a Big Bounce. In this talk, I will focus on...
Dr
bernard Pire
(cpht polytechnique)
22/07/2011 17:15
Exclusive hard reactions have seen much recent progress, both theoretically and experimentally. I shall first review some new results on the Transition distribution amplitudes (TDAs) which appear in the QCD factorized amplitude of some "backward" exclusive processes (ref : Phys.Rev. D82, 094030,2010 and papers in preparation). I will also show new results on NLO QCD corrections for timelike...
Dr
Francesco Lacava
(Dep. Physics University "Sapienza - Roma / INFN - Roma)
22/07/2011 17:15
The energy resolution of the hadronic calorimeters is determined by fluctuations in the development of the shower. In non compensating calorimeters the dominant contribution comes from the fluctuation of the electromagnetic shower fraction. The dual readout technique proposed by DREAM aims to correct event by event for the fluctuations of the e.m. component measuring at the same time...
Mme
Caterina Bloise,
Collaboration KLOE-2
(LNF-INFN)
22/07/2011 17:20
Flavour Physics and Fundamental Symmetries
Parallel session talk
A phi-factory offers the possibility to select pure kaon beams: neutral kaons from phi → KSKL are in fact produced in pairs and the detection of a KS (KL) tags the presence of a KL (KS), the same holds for charged kaons. This allows to perform precise measurement of kaon properties.
The KLOE experiment has measured most decay branching ratios of K_S, K_L amd K^+- mesons providing the basis...
Prof.
Michele Maltoni
(Instituto de Fisica Teorica UAM/CSIC)
22/07/2011 17:20
We present an up-to-date global analysis of solar, atmospheric,
reactor and accelerator neutrino data in the framework of
three-neutrino oscillations, discussing in detail the statistical
significance of the observed "hint" of non-zero theta_13 and
determining the presently allowed ranges of masses and mixing. We then
turn to models with one or two sterile neutrinos and present...
Dr
Ivanka Bozovic-Jelisavcic
(VINCA Institute of Nuclear Sciences)
22/07/2011 17:30
[On behalf of the FCAL Collaboration]
Detectors at future e+e- collider need special calorimeters in the very forward region for a fast estimate and precise measurement of the luminosity, to improve the hermeticity and mask the central tracking detectors from back-scattered particles. Using Monte Carlo simulations, designs optimized for the ILC and CLIC colliders are presented. Sensor...
Mlle
alexia gorecki
(LPSC)
22/07/2011 17:30
The Large Synoptic Survey Telescope (LSST) system will produce a 6-band wide and deep field astronomical survey of over 20,000 square degrees of the southern sky using an 8.4-meter ground-based telescope. Each patch of sky will be visited about 1000 times in ten years.
Its camera will be the world largest one, with 3200 Megapixels. It will cover a huge 9.6 square degree field of view, and...
Dr
Jennifer Girrbach
(TU Munich)
22/07/2011 17:35
Flavour Physics and Fundamental Symmetries
Parallel session talk
In a supersymmetric grand-unified model proposed by Chang, Masiero and Murayama the atmospheric neutrino mixing angle induces large new b --> s transitions. Relating the supersymmetric low-energy parameters to seven new parameters a_0, m_0^2, m_{\tilde g}, D, xi, tan(beta) and arg(mu) of this SO(10) GUT model, we perform a correlated study of several FCNC processes. The LEP limit on the ...
Prof.
Stefan Antusch
(Basel University)
22/07/2011 17:40
What is the origin of the observed fermion masses and mixing parameters? Neutrinos, with their small mass and large mixing, contribute an important part of this flavour puzzle. Could they possibly also provide the key towards its solution? We review the present status and discuss some recent developments regarding the flavour puzzle, from the neutrino physics perspective.
Alexander Oh
22/07/2011 17:45
Measurements of the diboson cross sections in the WW,WZ,and ZZ channels are presented. The data are compared to SM predictions and constraints are set on anomolous triple gauge couplings.
Eric KAJFASZ
(CPPM)
22/07/2011 17:45
Parallel session talk
We present the result of various searches for the production of supersymmetric
particles in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV using data collected
by the CDF and D0 detectors at the Fermilab Tevatron Collider and corresponding
to integrated luminosities of up to 6 fb$^{-1}$. We present results for the
searches for the pair production of stop squark and searches for the...
Georgios Tsipolitis
(National Technical University of Athens)
22/07/2011 17:45
The luminosity upgrade of the Large Hadron Collider at CERN (sLHC) foresees a luminosity increase by a factor five compared to the LHC. To cope with the corresponding increase in background rates, the Muon System of the ATLAS experiment at CERN will likely need major changes in the very forward/backward regions. The Muon ATLAS MicroMegas Activity (MAMMA) is focused on the development and...
M.
Raoul Rontsch
(University of Oxford)
22/07/2011 17:45
The process W^+W^- + dijet is of great importance at the LHC, not only in itself but also as a primary background to moderately heavy Higgs production in association with two jets. I present next-to-leading order results for this process calculated recently using unitarity methods. By looking at specific kinematic distributions, I will show how the reduced theoretical uncertainty can improve...
M.
Valentin Niess
(LPC, Clermont)
22/07/2011 17:50
Flavour Physics and Fundamental Symmetries
Parallel session talk
We present updated results for the CKM matrix elements from a global fit to Flavour Physics data within the Standard Model theoretical context. We describe some current discrepancies, established or advocated, between the available observables. These discrepancies are further examined in the light of New Physics scenarii.
Ignacio Sevilla
(CIEMAT, Madrid)
22/07/2011 17:50
Parallel session talk
The Dark Energy Survey will employ a powerful instrument, the Dark Energy Camera, and a state-of-the-art data management system on the improved Blanco 4-meter telescope at CTIO to probe the nature of dark energy and the cause of cosmic acceleration. The instrument includes a 520-Megapixel optical imager with red-sensitive CCDs covering a 3 square degree field of view and an active alignment...
M.
Salvatore Alessandro Tupputi
(Politecnico di Bari and INFN Sezione di Bari)
22/07/2011 18:00
The RPC muon system of the CMS detector at the CERN LHC remains uninstrumented in the pseudorapidity region 1.6<|eta|<2.4. An ongoing project aims at covering the region of the muon endcaps with large-area triple- GEM detectors whose features are suited to enhance muon tracking and preserve triggering capabilities for the CMS detector upgrade. The design and assembling of small (10cm×10cm) and...
Prof.
Mark Adams
(University of Illinois at Chicago)
22/07/2011 18:00
Parallel session talk
We report the result of searches for final states with 2 vector bosons,
either two photons or one photon plus one $Z$, in association with large missing
transverse energy produced in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV.
The data were collected with the D0 detector at the Fermilab Tevatron
Collider and correspond to up to 6.3 fb$^{-1}$ of integrated luminosity.
The observed...
Dr
Giovanni Ossola
(New York City College of Technology - CUNY)
22/07/2011 18:05
There are several solutions on the market for the automated computation of multi-particle scattering amplitudes at the one-loop
level. In this presentation I will review the results obtained in the past year and describe the main features of the Golem/Samurai
approach, that employs a d-dimensional extension of the OPP reduction method, in combination with an automated generation of...
Dr
Marcella Bona
(Queen Mary, University of London)
22/07/2011 18:05
Flavour Physics and Fundamental Symmetries
Parallel session talk
We present the summer 2011 update of the Unitarity Triangle (UT) analysis performed by the UTfit Collaboration within the Standard Model (SM) and beyond. Within the SM, combining the direct measurements on sides and angles, the UT is over-constrained allowing for the most accurate SM predictions and for investigation on the tensions due to the most recent updates from experiments and...
nicolas Chotard
(Institut de physique nucléaire de Lyon)
22/07/2011 18:10
Parallel session talk
Type Ia supernovae (SNe~Ia) are used as standard candles to measure the history of the universe expansion. However, precise measurements need an empirical standardization of the luminosities usually done with two light-curve derived parameters (stretch and color): brighter SNe~Ia exhibit a broader light curve, and redder objects are fainter. Employing the flux calibrated spectra sample...
MasterCode Collaboration
(MasterCode),
Samuel Rogerson
(Imperial College London)
22/07/2011 18:15
Parallel session talk
We present the latest results of the MasterCode collaboration on global SUSY fits.
Currently available experimental data are used to determine the preferred
SUSY and Higgs boson mass scales. The data comprise a combination of
high-energy SUSY searches, low-energy precision measurements and astrophysical
data. We include all relevant LHC searches for SUSY, electroweak
precision...
M.
Bjoern Penning
(University of Freiburg)
22/07/2011 18:15
We present measurements of inclusive W/Z + n jet cross sections (n=1-4), presented as total inclusive cross sections and differentially in the $n^{th}$ jet transverse momentum and rapidity, as well as the heavy flavor content in these jets up to n=2. The measurements are made using 4.2 to 6 fb$^{-1}$ of data collected by the D0 detector at the Fermilab Tevatron Collider. The measurements are...
M.
Cristoforo Simonetto
(TU Munich)
22/07/2011 18:15
In this talk I will consider an extension of the Standard Model by heavy right-handed neutrinos and a second Higgs doublet. In the decoupling limit of the extra particles, this model provides an explanation for the small neutrino masses and for the mild hierarchy observed between the atmospheric and solar mass splittings without jeopardizing any of the successes of the Standard Model. Finally...
M.
Johannes Bergström
(Royal Intstitute of Technology)
23/07/2011 09:00
We investigate numerically how accurately one could constrain the strengths of different short-range contributions to neutrinoless double beta decay in effective field theory. Depending on the outcome of near-future experiments yielding information
on the neutrino masses, the corresponding bounds or estimates can be stronger or weaker. A particularly interesting case, resulting in strong...
Dr
Tatyana Dimova
(Budker Institute of Nuclear Physics, Novosibirsk, Russia)
23/07/2011 09:00
The results of the first data taking run in the 1-2 GeV range with
SND detector at VEPP-2000 e+e- collider are presented. The reported data
are based on the integrated luminosity of 5.5pb^{-1}. The preliminary results on multihadron cross sections, e.g., e+e->\pi^+\pi^-\pi^0, 2\pi^0\gamma, \pi^+\pi^-\pi^0\pi^0 are obtained. The future program is discussed.
Elias Kiritsis
(UoC and APC)
23/07/2011 09:00
Parallel session talk
We propose holographic models based on Einstein-dilaton gravity with a potential in 5 dimensions. Such theories, for a judicious choice of potential are very close to the physics of large-N YM theory both at zero and finite temperature. The zero temperature glueball spectra as well as their finite temperature thermodynamic functions compare well with lattice data. The model can be used to...
Dr
Alberto Garfagnini
(Universita' di Padova e INFN)
23/07/2011 09:15
Observation of 0nbb would determine an absolute mass scale for neutrinos, prove that neutrinos are massive Majorana particles (indistinguishable from their own antiparticles), and constitute physics beyond the Standard Model. There are several experiments based on cryogenic crystals that try to find evidence on this reaction. A review of the current state of the field and the plans for the...
Dr
Simon Eidelman
(Budker Institute)
23/07/2011 09:15
The CMD-3 detector at the VEPP-2000 electron-positron collider in the Budker Institute in Novosibirsk collected about 20/pb in the center-of-mass energy range from 1 to 2 GeV during the first year of operation. First results on the hadronic cross sections are reported important for improving the precision of the theoretical predictions for the muon anomalous magnetic moment.
Peter Bussey
23/07/2011 09:30
Parallel session talk
Isolated photon production in deep inelastic ep scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of 320pb-1. Measurements were made in the isolated-photon transverse-energy and pseudorapidity ranges 4 < ET < 15 GeV and -0.7 < eta < 0.9 for exchanged photon virtualities, Q2, in the range 10 < Q2 < 350 GeV and for
invariant masses of the hadronic...
M.
Nils-Erik Bomark
(University of Bergen)
23/07/2011 09:30
Parallel session talk
Adding trilinear R-parity violating terms to a supersymmetric scenario, has large implications for collider phenomenology. We show that a large fraction of parameter space yields a scenario reminiscent of the standard MSSM but where the neutralino instead of escaping the detector, decays to standard model particles. This would give rise to spectacular multi-lepton and/or multi-jet...
Dr
Michal Heller
(Universiteit van Amsterdam / Institute for Nuclear Studies)
23/07/2011 09:30
Parallel session talk
We report on the evolution of boost-invariant N=4 super Yang-Mills plasma covering a large range of proper times starting from various nonequilibrium states at tau=0, through a transition to a hydrodynamic regime and following subsequent hydrodynamic expansion. The results are obtained through numerical solution of Einstein's equations for the dual geometries. Despite the very rich far from...
Dr
Graziano Venanzoni
(INFN - Laboratori Nazionali di Frascati)
23/07/2011 09:30
The KLOE experiment at the $\phi$ factory DA$\Phi$NE in Frascati
(near Rome) is the first to have employed Initial State Radiation (ISR)
to precisely determine the $e^+e^-\to\pi^+\pi^-(\gamma)$ cross section below 1 GeV. Such a measurement is particularly important to test the Standard Model calculation for the (g-2) of the muon, where a long standing 3$\sigma$ discrepancy is...
Dr
Mike Marino
(TU Munich)
23/07/2011 09:35
Observation of 0nbb would determine an absolute mass scale for neutrinos, prove that neutrinos are massive Majorana particles (indistinguishable from their own antiparticles), and constitute physics beyond the Standard Model. There are several experiments based on liquid detector technology that try to find evidence for this reaction. A review of the current state of the field and the plans...
Dr
Costas Vellidis
(Fermilab)
23/07/2011 09:45
We report a measurement of the cross section of prompt isolated photon pair production in ppbar collisions at a total CM energy of 1.96 TeV using data of 5.4/fb integrated luminosity
collected with the CDF II detector at the Fermilab Tevatron.
The measured differential cross section
is compared with three perturbative QCD predictions,
a Leading Order (LO) parton shower Monte Carlo and...
Dr
Ayan Mukhopadhyay
(LPTHE, University of Paris VI, France)
23/07/2011 09:45
Parallel session talk
We argue, using inputs from both field theory and gravity, that all non-equilibrium phenomena holographically dual to solutions of pure gravity, are determined completely by a closed set of equations of motion of the energy-momentum tensor. These phenomenological equations include energy-momentum conservation, but additional equations for evolution of the shear-stress tensor also. A class of...
Paul Jackson
23/07/2011 09:45
Parallel session talk
R-parity violation in supersymmetry gives rise to many unique experimental signatures. We describe searches with the ATLAS detector for supersymmetry with R-parity violation. Examples include searches for sneutrino decay to electron plus muon, and displaced vertices from the late decays of heavy objects. The most recent results on these channels will be given based on data recorded in 2010 and 2011.
M.
Sebastian Fischer
(For the KATRIN Collaboration - Karlsruhe Institute of Technology)
23/07/2011 09:55
The KATRIN experiment is the next generation tritium beta decay experiment which aims for a direct, model-independent measurement of the electron neutrino mass with 200 meV/c^2 sensitivity (90% C.L.). This corresponds to an improvement of the sensitivity by one order of magnitude in comparison to current results of tritium beta decay neutrino mass experiments. KATRIN uses a high-luminosity...
Prof.
Nikolay SKACHKOV
(Joint Institute for Nuclear Research)
23/07/2011 10:00
Samples of inclusive $\gamma+{\rm 2~jet}$ and $\gamma+{\rm 3~jet}$ events collected by the D0 experiment
with an integrated luminosity of about 1~fb$^{-1}$ in $p\bar{p}$ collisions
at $\sqrt{s}=1.96$ TeV are used to measure cross sections
as a function of the angle in the plane transverse to the beam direction
between the transverse momentum ($p_T$)
of the $\gamma+$leading jet system...
Prof.
Jan Kalinowski
(University of Warsaw)
23/07/2011 10:00
Parallel session talk
The Higgs sector of the $R$-symmetric supersymmetric model includes two iso-doublets R_{d,u} in addition to the standard iso-doublets H_{d,u}. Masses and interactions of these novel states are analysed and their decay modes and production channels at the LHC and e+e- colliders are calculated.
Dr
Kyo Shibata
(High Energy Accelerator Research Organization (KEK))
23/07/2011 10:00
SuperKEKB, which is an upgrade of KEKB B-factory (KEKB), is a next-generation high luminosity electron-positron collider with asymmetric energies of 7 GeV (e-) and 4 GeV (e+).
Its predecessor, KEKB, was operated from 1998 to 2010 and had been a leader in the race to provide the world’s highest luminosity since 2001. It delivered a total integrated luminosity more than 1 /ab to Belle detector...
Dr
Frank Saueressig
(Institut für Physik, Johannes Gutenberg Universität Mainz)
23/07/2011 10:00
Parallel session talk
Weinberg's asymptotic safety scenario proposes that gravity constitutes a consistent and predictive Quantum Field Theory within Wilson’s generalized framework of renormalization. The key ingredient in the construction is a non-trivial fixed point of the gravitational renormalization group flow which controls the UV behavior of the theory and renders it safe from unphysical divergences. This...
Prof.
Alessandro Strumia
(Pisa University and INFN)
23/07/2011 10:10
Assuming that the new particles introduced by type-I, type-II, type-III see-saw in order to mediate neutrino masses are below a TeV, we describe their resulting manifestations at LHC.
Dr
Amine Benhenni
(LCC Montpellier)
23/07/2011 10:15
Parallel session talk
We consider no-scale supergravity inspired scenarios, with emphasize on the possible dynamical determination of the gravitino mass and connected soft supersymmetry-breaking parameters, through radiative corrections to an essentially flat tree-level potential in the hidden sector.
We (re)emphasize the important role played by the scale-dependent vacuum energy contribution to the...
Dr
Andres Collinucci
(LMU, Munich)
23/07/2011 11:00
Parallel session talk
F-theory was developed in the mid-nineties as a tool to study IIB string theory beyond its perturbative regime. Although conceptually less understood than its "spouse", M-theory, F-theory is a more practical tool for model building mainly because it is anchored to algebraic geometry. This well-studied field of mathematics facilitates spectacularly detailed calculations and provides for endless...
Hannes Jung
23/07/2011 11:00
Parallel session talk
We present measurements of the forward (3 < |eta| < 5) energy flow in minimum bias events and in events with either hard jets or W and Z bosons produced at central rapidities, as well as measurements of the inclusive forward jet cross section and of associated production of forward and central jets. The dijet "k-factor", defined as the ratio of the inclusive to the exclusive dijet cross...
Iacopo Vivarelli
23/07/2011 11:00
Parallel session talk
The most sensitive channels to Supersymmetry in proton-proton collisions are composed of jet(s) and missing transverse momentum final states (with and without b-jets). The most recent results on these channels will be given based on data recorded in 2011
Dr
Susanne Westhoff
(Mainz University)
23/07/2011 11:00
A theory review of the forward-backward anomaly observed in top-quark pair production at the Tevatron is presented. I discuss various attempts to explain the large forward-backward asymmetry by physics beyond the Standard Model model. Significants constraints arise from flavour and electroweak precision observables, as well as direct production of new particles at hadron colliders. A large...
Jonathan Jason Hollar
23/07/2011 11:15
Parallel session talk
A measurement of the total, inelastic pp cross section at 7 TeV, based on the observation of pile-up events, is presented.
Measurements of soft and hard diffractive processes obtained with the CMS detector at various centre-of-mass energies are presented and compared with the PYTHIA6, PHOJET and PYTHIA8 Monte Carlo generators. The ratio of diffractive to inclusive jet production is obtained...
Dr
Thierry Lasserre
(Saclay)
23/07/2011 11:15
Recently new reactor antineutrino spectra have been provided for 235U, 239Pu, 241Pu and 238U, increasing the mean flux by about 3 percent. We will review the synthesis of published experiments at reactor-detector distances <100 m leading to a ratio of observed event rate to predicted rate of 0.943(0.023), deviating from unity at the 98.6% C.L.. The compatibility of this new result with the...
M.
Christian Autermann
(Hamburg University)
23/07/2011 11:20
Parallel session talk
We present the results of searches for Supersymmetry in all-hadronic final states with jets and missing transverse energy, including the cases of jets identified as b-jets, the decay products of top quarks and hadronically decaying tau leptons. The searches are performed using data collected by the CMS experiment at the LHC in pp-collisions at a center-of-mass energy of 7 TeV. Various...
Prof.
Bozzo Marco
(INFN Genova)
23/07/2011 11:30
The TOTEM experiment at the LHC, placed symmetrically with respect to the CMS Interaction Point IP5, is optimized to measure in dedicated special-optics runs, luminosity independently, the total pp cross-section and to study elastic pp scattering over a wide range in momentum transfer from -t ~ 10 -3 to 10 GeV2. Furthermore, diffractive dissociation, including single, double and central...
Dr
Eran Palti
(Ecole Polytechnique)
23/07/2011 11:30
Parallel session talk
We study proton decay in Grand Unified Models based on F-theory. We calculate the coupling of the heavy Higgs triplet modes to the light quark generations. This coupling plays an essential part in dimension 5 proton decay and we show that it is very different from the associated Yukawa coupling.
Dr
Emiliano Molinaro
(CFTP - IST)
23/07/2011 11:40
We study a type I see-saw scenario where the right-handed (RH) neutrinos, responsible for the light neutrino mass generation, lie at the electroweak scale. Under certain conditions, the strength of the charged (CC) and neutral current (NC) weak interactions of the Standard Model particles with the heavy RH neutrinos can be large enough to allow the production of the latter at the LHC, opening...
Alessandro Broggio
(Johannes Gutenberg Universität)
23/07/2011 11:40
Parallel session talk
We use a recent approach to threshold soft gluon resummation, based on
effective field theory, to quantify the dynamical enhancement of the
partonic threshold region for Drell-Yan and slepton pair production in
supersymmetry. We evaluate the resummed invariant mass distribution
and total cross section at the NNLL order, and match the result onto NLO
fixed order calculation.
Thomas Ruf
23/07/2011 11:45
Parallel session talk
The phase space coverage of the LHCb detector allows a unique insight into the
particle production in the forward region at the LHC. Due to its unique pseudorapidity
coverage and the possibility of extending the measurements to low transverse
momenta, the LHCb data provide important input to the understanding of particle
production in a kinematical range where QCD models have large...
Dr
Michele Cicoli
(DESY, Hamburg)
23/07/2011 11:45
Parallel session talk
We present examples of string compactifications with an anisotropic shape of the extra dimensions which are very promising to make contact with current experiments since they allow the existence of micron-sized extra dimensions, TeV scale strings and hidden Abelian gauge bosons with a kinetic mixing with the ordinary photon.
Ilias Efthymiopoulos
(CERN)
23/07/2011 11:50
An outline of the present and future long-baseline neutrino facilities with emphasis on the possibilities at CERN is presented. Accelerator-made neutrinos for long baseline oscillation experiments open the exploration to a broad and rather interesting field of physics experiments, with the measurement of the neutrino mixing angle (θ13), the determination of the sign of neutrino mass hierarchy...
Dr
Francois-Xavier Josse-Michaux
(CFTP,IST)
23/07/2011 11:55
We present a UV-completion of the Inverse-Seesaw model for the Neutrino masses, where 3 right-handed Neutrinos and one extra Higgs doublet are added to the Standard Model. Through the addition of two extra scalar fields, the model provides a natural mechanism for the generation at of the Baryon Asymmetry of the Universe and for thermal Dark Matter. A Global U(1) spontaneously broken explains...
Helen Hayward
23/07/2011 11:55
Parallel session talk
Channels with one or several leptons or photons and high missing transverse momentum (and potentially high pT jets or b-jets) are a natural place to search for supersymmetry at the LHC. The most recent results on these channels will be given based on data recorded in 2011
Dieter Luest
(Max-Planck-Institut fuer Physik, Ludwig-Maximilians-Universitaet)
23/07/2011 12:00
Parallel session talk
In this talk I will discuss possible stringy signatures at hadron colliders.
I will concentrate on D-brane models with a low string scale in the TeV region.
The production of string resonances in di-jet events as well as leptophobic Z'-gauge bosons
will be discussed. Also some more formal aspects of low string scale
compactifications in connection with black holes will be mentioned at the end.
Dr
Martin Hentschinski
(IFT-UAM Madrid)
23/07/2011 12:00
We present a definition of an unintegrated seaquark density
for the LO CCFM Monte-Carlo CASCADE and discuss determination of a NLO
BFKL unintegrated gluon density from a fit to combined HERA data. The
kT-dependent sea-quark density is defined using high energy
factorization, while the quark-gluon splitting is treated with exact
kinematics. The latter is found to agree with the...
Andre Rubbia
(ETH Zurich)
23/07/2011 12:10
The talk will summarise the current status and potential of future long baseline experiments.
Sanjay Padhi
(University of California, San Diego)
23/07/2011 12:15
Parallel session talk
We present the results of searches for Supersymmetry in various topologies that lead to final states with jets and missing transverse momentum together with one or more isolated leptons, one or two photons or a photon and a lepton. The searches are performed using data collected by the CMS experiment at the LHC in pp-collisions at a center-of-mass energy of 7 TeV. Various data-driven...
Dr
Samuel Wallon
(LPT Orsay and UPMC university)
23/07/2011 12:15
We present the first next-to-leading BFKL study of the cross section and azimuthal decorrellation of Mueller Navelet jets. This includes both next-to-leading corrections to the Green's function and next-to-leading corrections to the Mueller Navelet vertices. The obtained results for standard observables proposed for studies of Mueller Navelet jets show that both sources of corrections are of...
Prof.
Gail Hanson
(University of California, Riverside)
23/07/2011 12:15
A muon accelerator facility that leads to a multi-TeV Muon Collider presents the unique opportunity to explore new physics within a number of distinct programs that can be brought online as the facility evolves. An introduction to the Muon Collider facility and its capabilities will be given. The Muon Accelerator Program, hosted by Fermilab, has recently been approved by the U.S. Department of...
Richard Polifka
23/07/2011 12:30
Parallel session talk
The cross section for the diffractive deep-inelastic scattering process ep -> e X p is measured, with the leading final state proton detected in the H1 Forward Proton Spectrometer. The data are compared to perturbative QCD predictions at next-to-leading order based on diffractive parton distribution functions previously extracted from complementary measurements of inclusive diffractive...
Gabriele Honecker
(Universitaet Mainz)
23/07/2011 12:30
Parallel session talk
Fractional D6-branes on toroidal orbifold backgrounds are known to be able to accommodate the particle spectrum and gauge group of the Standard Model, but up to now exact results for their low-energy effective action are missing.
In this talk, I will discuss how the conceptual ansatz for the field theory on the torus is generalised to those orbifold backgrounds on which the Standard Model...
Dr
Adam Dobbs
(Imperial College London)
23/07/2011 12:40
The muon ionization cooling experiment (MICE) is a strategic R&D project intending to demonstrate the only practical solution to prepare high brilliance beams necessary for a neutrino factory or muon colliders. MICE is under development at the Rutherford Appleton Laboratory (UK). It comprises a dedicated beam line to generate a range of input emittance and momentum, with time-of-flight and...
Dr
Paul Soler
(University of Glasgow)
23/07/2011 12:45
We illustrate that the baseline Neutrino Factory configuration being developed within the International Design Study for the Neutrino Factory (the IDS-NF) is optimized for standard oscillation-physics measurements and for searches for new physics. For small values of θ13 (sin22θ13 < 10-2) a Neutrino Factory with two storage rings in which 25 GeV muons decay, pointing to two neutrino...
Dr
Cezar Condeescu
(CPHT - Ecole Polytechnique)
23/07/2011 12:45
Parallel session talk
We investigate the transmutation of D-branes into Abelian magnetic backgrounds on the world-volume of higher-dimensional branes, within the framework of global models with compact internal space. The phenomenon, T-dual to brane recombination in the intersecting-brane picture, shares some similarities to small-instanton transitions in non-compact space, though in this case the Abelian magnetic...
Prof.
Fabio ZWIRNER
(Univ. and INFN, Padova)
23/07/2011 14:30
ECFA plenary
Steinar Stapnes
(CERN)
23/07/2011 14:40
ECFA plenary
Tatsuya Nakada
(EPFL Lausanne)
23/07/2011 14:55
ECFA plenary
Marcello Giorgi
(Univ. di Pisa & INFN Pisa)
23/07/2011 15:05
ECFA plenary
Guido Altarelli
(Roma Tre Univ.)
23/07/2011 15:25
ECFA plenary
Steve Myers
(CERN)
23/07/2011 16:05
ECFA plenary
Pippa Wells
(CERN)
23/07/2011 17:15
ECFA plenary
David Wark
(Rutherford Appleton Laboratory)
23/07/2011 17:55
ECFA plenary
Francis Halzen
(Univ. Wisconsin–Madison)
23/07/2011 18:15
ECFA plenary
23/07/2011 18:40
ECFA plenary
George Smoot
(LBNL & UC Berkeley & Univ. Paris 7)
25/07/2011 10:30
Plenary talk
Arnaud Duperrin
(CPPM-Marseille)
25/07/2011 11:30
Plenary talk
Guido Tonelli
(INFN & Univ. Pisa)
25/07/2011 12:00
Plenary talk
Dave Charlton
(Univ. Birmingham)
25/07/2011 12:30
Plenary talk
Giulia Zanderighi
(Oxford Univ.)
25/07/2011 15:00
Plenary talk
Lance Dixon
(CERN & SLAC)
25/07/2011 17:00
Plenary talk
Carlos Salgado
(Univ. Santiago de Compostela)
25/07/2011 18:00
Plenary talk
Yoichiro Suzuki
(Kamioka Obs. & IPMU Tokyo)
26/07/2011 09:00
Plenary talk
Teresa Montaruli
(Univ. Wisconsin & INFN & Univ. Bari)
26/07/2011 11:00
Plenary talk
Julien Lesgourgues
(LAPTh - Annecy & CERN & LPHE Lausanne)
26/07/2011 11:30
Plenary talk
Marek Kowalski
(Univ. Bonn)
26/07/2011 12:00
Plenary talk
Steve Myers
(CERN)
26/07/2011 15:00
Plenary talk
Koichiro Nishikawa
(KEK)
26/07/2011 17:00
Plenary talk
Stefan Schoenert
(TU München)
26/07/2011 17:30
Plenary talk
Peter Krizan
(Ljubljana Univ. & Stefan Inst.)
27/07/2011 11:30
Plenary talk
Toshinori Mori
(ICEPP Univ. Tokyo)
27/07/2011 12:00
Plenary talk
Slava Rychkov
(LPTENS & Univ. Paris-6)
27/07/2011 14:30
Plenary talk
Mme
Stefania bordoni
(LPNHE-Universites Paris 6-Paris 7)
Top and Electroweak Physics
Poster
This poster presents measurements of the inclusive differential cross-section of electron production in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. From a data sample of 1.4 pb−1 collected by the ATLAS detector at the Large Hadron Collider, the electron cross-section measurement is presented as a function of transverse momentum, pT , in the range 7 < pT < 26 GeV and...
428.
A light-front coupled-cluster method for the nonperturbative solution of quantum field theories
Prof.
John Hiller
(University of Minnesota Duluth)
Poster
We propose a new nonperturbative method that is based on a light-front Hamiltonian approach and the exponential-operator techniques of the many-body, coupled-cluster method. The mass eigenstates of the field theory are written as infinite expansions in Fock space but approximated by the exponentiation of an operator acting on a projection onto the lowest Fock sector. The full eigenvalue...
Dr
Marcos Dracos
(IPHC Strasbourg)
Accelerators
Poster
In the framework of the EUROnu design study, we have developed a new design for the
CERN to Fréjus neutrino beam based on the proposed linear accelerator SPL. The aim of this beam is to study CP violation in the neutrino sector, with a proton beam of 4.5 GeV/c, a baseline of 130 km and the water Cherenkov MEMPHYS (440 kton fiducial mass) as the far detector.
The main challenge of this...
Dr
Paul Soler
(University of Glasgow)
Accelerators
Poster
The Neutrino Factory produces high-energy neutrino beams with a well-defined flavour content and energy spectrum from the decay of intense, high-energy, stored muon beams. The muon storage rings include long straight sections that are directed toward neutrino detectors that are sited several thousand kilometers away. This talk describes the status of the accelerator facility described in the...
Mlle
Louise Skinnari
(UC Berkeley / LBNL)
Detector R & D and data handling
Poster
ATLAS is a multipurpose experiment that records the products of the LHC collisions. In order to reconstruct trajectories of charged particle produced in these collisions, ATLAS is equipped with a tracking system built using two different technologies, silicon planar sensors (pixel and microstrips) and drift-tube based detectors. Together they constitute the ATLAS Inner Detector, which is...
Meriem Hadjer LAGRAA
(Laboratoire de Physique Théorique d'Oran (LPTO), Université d'Oran Es-Sénia.)
Poster
Inspiring by the Holst case, the Palatini (Palatini-Holst) action was generalized by adding term of real function depending on the Torsion which has no effects on the obtained evolution equations which are the classical vacuum Einstein equations (M. Dubois-Violette and M. Lagraa Lett. Math. Phys, 91 83, 2010). Through this poster, we shall expose an analysis of these new actions which shows...
Mlle
Jiyeon Han
(University of Rochester)
Top and Electroweak Physics
Parallel session talk
We report on the measurement of angular coefficients and the forward and backward asymmetry (Afb) of Drell-Yan dilepton pairs from $p\bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV. The data sample is collected by the CDF II detector. The angular distributions are studied as a function of the transverse momentum of dilepton pair and Afb is measured using the event weighting technique. The...
M.
Nicolas Arnaud
(in2p3-LAL)
Detector R & D and data handling
Poster
Charged particle identification (PID) is a key input for the physics program of the SuperB experiment. In the barrel region, the main detector for K/$\pi$ separation will be the 'Focusing Detector of Internally Reflected Cherenkov light' (FDIRC), the successor of the successful BaBar DIRC, which camera has been completely re-designed. In addition, R&D is ongoing to add a detector on the...
Dr
Wolfgang Lucha
(Austrian Academy of Sciences)
QCD
Poster
The decay constants of the heavy pseudoscalar mesons D and D_s are revisited within a recently developed novel approach to dispersive QCD sum rules relying on an unprejudiced implementation of quark–hadron duality. The proposed modifications of standard sum-rule techniques are assessed by applying our prescriptions to quantum mechanics, where exact solutions may be easily found by simply...
Guillaume Toucas
(Laboratoire de Physique Théorique d'Orsay)
Flavour Physics and Fundamental Symmetries
Poster
Due to the intermediate position of the strange quark in the hierarchy of quark masses, a numerical competition may arise in chiral series between leading (LO) and next-to-leading order (NLO) in three-flavour Chiral Perturbation Theory (ChPT), as it was suggested by several studies performing a chiral extrapolation of Nf=2+1 lattice data. A way to study this question is to use a modified...
Dr
Valeriy Dvoeglazov
(Universidad de Zacatecas)
QCD
Poster
Trace theorems for the S=1 Barut-Muzinich-Williams matrices
are considered. The formulas of the relativistic scalar product
\gamma_{\mu\alpha}\ldots \gamma_{\beta\mu}, etc.,
are found. They are analogs of the well-known
Chisholm-Caianiello-Fubini identities. The obtained results
could be useful in the higher-order calculations
of the high-energy processes with S=1 and S=0 particles...
Nicolas BOUSSON
(Centre de Physique des Particules de Marseille)
Poster
The ability to identify jets containing b-hadrons is important for the high-pT physics program of a general-purpose experiment at the LHC such as ATLAS. Two robust b-tagging algorithms taking advantage of the impact parameter of tracks or reconstructing secondary vertices have been swiftly commissioned and used for several analyses of the 2010 data: bottom and top quark production...
M.
Marco Schreck
(Institut für Theoretische Physik, Karlsruhe Institute of Technology (KIT))
Poster
Lorentz symmetry is one of the fundamental cornerstones on which the Standard Model of elementary particle physics is based. However, toy models of physics at the Planck scale, such as space time foams, lead to Lorentz symmetry breaking. In the low energy limit such a violation of Lorentz invariance can be described in the framework of an effective quantum field theory. Background fields are...
Riccardo Maria Bianchi
(CERN)
Detector R & D and data handling
Poster
The ATLAS experiment at the Large Hadron Collider at CERN relies on a complex and highly distributed Trigger and Data Acquisition (TDAQ) system to gather and select particle collision data at unprecedented energy and rates.
The control and configuration (CC) system is responsible for all the software required to configure and control the ATLAS data taking. This ranges from high level...
Dr
Tomas Brauner
(Bielefeld University)
Flavour Physics and Fundamental Symmetries
Poster
Generating sufficient amount of CP violation that would account for the observed matter-antimatter asymmetry in the universe is a long-standing problem in particle physics. It is a common lore that new physics beyond the Standard Model is needed for this purpose. This claim is based on earlier perturbative estimates of effective CP violation in the bosonic sector of the Standard Model induced...
Dr
Robert Kaminski
(Institute of Nuclear Physics Polish Academy of Sciences)
QCD
Poster
Recently presented new-one subtracted dispersion relations with imposed crossing symmetry condition for the pi-pi S - and P -wave scattering amplitudes and the well known Roy's equations with two subtractions have led to a set of many partial wave amplitudes in very wide energy range [1].
They allow for. e.g. a very precise and unambiguous determination of scattering lengths and ...
Ingo Schienbein
(LPSC)
QCD
Poster
We calculate transverse momentum ($p_T$) distributions for the inclusive hadroproduction at next-to-leading order in the general-mass variable-flavor-number scheme. We present results for the ATLAS, CMS, LHCb and ALICE experiments and compare with first data.
Roger Barlow
(Huddersfield University)
Accelerators
Poster
Measurement of delta, the CP violating phase in the neutrino mixing matrix, is a crucial next step in our understanding of the universe. It appears as a +- sin(delta) term in the expression for the rate of oscillation from muon to electron neutrinos: CP violation makes the rate for nu_mu to nu_e transitions different from nu_mu bar to nu_e bar. However delta can be determined by measuring...
Mlle
Katja Klein
(RWTH Aachen University)
Detector R & D and data handling
Poster
The CMS experiment foresees upgrades of its silicon pixel and strip detectors for the luminosity upgrade of the LHC. Due to an increase in the number of readout channels and higher complexity larger currents will have to be provided to the detector. Since cable channels are hardly accessible and space for cables is limited, this would lead to excessively large resistive power losses in the...
Dr
Oliver Grimm
(ETH Zurich)
Detector R & D and data handling
Poster
A camera for ground-based based Cherenkov astronomy using Geiger-mode Avalanche Photodiodes (GAPD) was developed within the FACT project (First G-APD Cherenkov Telescope). Its essential design components are solid light concentrators to make full use of the large angular acceptance of G-APDs and camera-integated digitizaton and trigger electronics. Data transfer from the camera to the counting...
Dr
Paul Soler
(University of Glasgow)
Detector R & D and data handling
Poster
Studies carried out in the framework of the International Design Study for the Neutrino Factory (the IDS-NF) show that the sensitivity to the CP violating phase and the last unknown mixing angle θ13 is maximised when two far detectors optimized to detect the sub-leading νe to νμ oscillation are combined. Several technologies are being discussed for these detectors: magnetised iron...
Martin Zdrahal
(IPNP, Faculty of Mathematics and Physics, Charles University in Prague)
Flavour Physics and Fundamental Symmetries
Poster
A natural method for the precise determination of the $m_d-m_u$ mass difference, which is still beyond the reach of direct lattice simulations, is a comparison of a measured value of some quark-mass dependent observable with its chiral perturbation theory prediction. The most promising processes for such study seem to be eta->3pi decays. Unfortunately, achieving this goal is complicated by...
M.
George Iakovidis
(NTUA)
Detector R & D and data handling
Poster
The luminosity upgrade of the Large Hadron Collider at CERN (sLHC) foresees a luminosity increase by a factor five compared to the LHC. To cope with the corresponding increase in background rates, the Muon System of the ATLAS experiment at CERN will need major changes in the high rapidity region. The Muon ATLAS MicroMegas Activity (MAMMA) focuses on the development and testing of large-area...
Prof.
Dhiman Chakraborty
(Northern Illinois University)
Detector R & D and data handling
Poster
Scintillator tiles directly coupled to photo-sensors (without wavelength shifting fiber) offer greatly simplified construction for highly granular detectors. The performance of these detectors requires uniform response across the surface of the scintillator. Flat and shaped scintillator tiles directly coupled to silicon photo-multipliers have been investigated with both a radioactive source...
M.
Timothée Theveneaux-Pelzer
(LPNHE/IN2P3/CNRS)
Top and Electroweak Physics
Poster
The understanding of the reconstruction of electrons in the ATLAS experiment at LHC is one of the key issues for the run at a center of mass energy of 7 TeV and is of particular importance in any analysis with isolated electrons in final state. We describe the measurements performed using tag-and-probe techniques to establish reference electron efficiencies at low transverse energies based on...
Prof.
Paul Newman (for the LHeC study group)
(University of Birmingham)
Poster
The Large Hadron electron Collider (LHeC) is a proposed facility which will exploit the LHC heavy ion beam for electron-nucleus scattering, using a new electron accelerator. This contribution, which is derived from the draft CERN-ECFA-NuPECC Conceptual Design report (due for release in 2011), addresses the expected physics impact of the LHeC for heavy ion physics. The kinematic coverage at low...
Dr
Masaya Kohda
(National Taiwan University, Taiwan)
Poster
We address the electroweak baryogenesis based on the standard model with a fourth generation. The conventional three-generation standard model (SM3) fails to explain the baryon asymmetry of the universe, although it can satisfy all three Sakharov’s conditions in principle. One of the reasons of this failure is the insufficiency of the CP violation from the Kobayashi-Maskawa phase. An existence...
Dr
Oliver Grimm
(ETH Zurich)
Detector R & D and data handling
Poster
Experiments integrating several hardware and software components require, except for the simplest cases, a control system. Comprehensive control system frameworks exist, for example EPICS, DOOCS or the commercial PVS-II. For a small scale application, these systems are however often too complicated and need professional support for their installation and maintenance. This presentation gives an...
Dorota Sokolowska
(University of Warsaw)
Poster
Inert Doublet Model is a minimal extension of the Standard Model with the second scalar doublet that may provide a Dark Matter candidate. We consider possible evolutions of the Universe to this state during cooling down of the Universe after inflation, taking into account first order of the temperature corrections to the potential. We argue that in the past Universe could pass through phase...
Dr
Antonio Uras
(IPNL Lyon)
Detector R & D and data handling
Poster
ALICE is the experiment dedicated to the study of the quark gluon plasma in heavy-ion collisions
at the LHC. Improvement of ALICE sub-detectors for the upgrade plans of the year 2017 are
ongoing. The Muon Forward Tracker (MFT) is a proposal in view of this upgrade. The MFT is a
silicon pixels detector added in the Muon Spectrometer acceptance ($−4 < \eta < −2.5$) upstream
of the hadronic...
M.
Guido Magazzu Magazzu
(University of California Santa Barbara (UCSB) / INFN-Pisa)
Detector R & D and data handling
Poster
In future High Energy Physics experiments severe power and radiation hardness requirements and non-homogeneous latency and bandwidth constraints in data transfers from Front-End electronics to remote trigger processors and readout systems will push toward “standard” and flexible protocols and modular architectures. The use of IP-cores available to ASIC and FPGA designers will contribute to...
Dr
Harleen Dahiya
(Dr. B.R. Ambedkar National Institute of Technology)
QCD
Poster
The chiral constituent quark model ($\chi$CQM) is known to provide a satisfactory explanation of the proton spin and related issues in the nonperturbative regime. It has been extended to understand the effects of nonperturbatively generated ``quark sea'' to determine the flavor structure of the octet baryons. In particular, we have calculated the sea quark distribution functions, quark sea...
Krzysztof Piotrzkowski
(UCLouvain)
Detector R & D and data handling
Poster
Development of GasToF, a picosecond resolution Cherenkov gas detector using the fastest single anode MCP-PMTs, is reviewed including its various design options. New results obtained from measurements at the CERN test-beams in August and September 2010 are presented. In particular, the measured timing resolution of about 5 ps is discussed in depth. This is confronted with detailed modelling of...
Andrea Lavagno
(Politecnico di Torino)
Poster
We study the hadron yield ratios at finite value of baryon density and temperature by means of an effective relativistic mean-field model with the inclusion of the full octet of baryons, the Delta-isobars degrees of freedom and the lightest pseudoscalar and vector mesons. These last particles are considered in the so-called one-body contribution, taking into account of an effective chemical...
Prof.
Francisco Fernandez
(University of Salamanca)
QCD
Poster
The discovery of the $J/\psi$ meson in 1974 was the experimental confirmation of the existence of the charmed quark introduced theoretically in 1970 by Glashow, Iliopoulus and Maiani to explain the cancellation of loop diagrams in $K^0$ weak decays. Consisting of a charmed $c$ quark and a $\bar c$ antiquark the $J/\psi$ particle became the starting point of a whole family of bound states...
Dr
Patrizia Conde-Muino
(LIP)
Higgs and New Physics
Poster
The decay of the Standard Model-like Higgs boson into bb is the dominant decay
process in the region of low Higgs boson masses. The Higgs search in this channel
requires an associated heavy object, allowing for strong discrimination from the
dominant multi-jet background processes. We present the status of the Higgs searches
in the H->bb channel based on the ATLAS data collected so far in 2011.
Dr
Pelin Kurt
(Vanderbilt University)
QCD
Poster
Using 36 pb-1 of proton-proton collisions at a center-of-mass energy of 7TeV collected by the CMS detector at the Large Hadron Collider at CERN, we have performed studies of the jet transverse structure. The fractional transverse momentum distribution as a function of the distance from the jet axis, is used to define the differential and the integrated jet shape variables. The unfolded...
M.
Daniel Albornoz Vasquez
(LAPTH)
Astroparticle Physics
Poster
Next-to-Minimal Supersymmetric Standard Model neutralino dark matter candidates in the 1-15 GeV range are found with a Markov Chain Monte Carlo scanning code. A very light, singlet-like Higgs and/or CP-odd Higgs are needed to achieve such masses. Implications for direct detection (spin independent and spin dependent interactions) and indirect detection (gamma-rays, radio and antimatter) will...
Linda GHEGAL
(LPMPS Mentouri University, Constantine, ALGERIA.)
Poster
We discuss the limits on the scale of noncommutative (NC) parameter Λ_{NC} via studying ttbar pair production in noncommutative extension of the standard model (SM) using the Seiberg-Witten maps and the star product to the first order of the noncommutative parameter Θ_{μν}.
Prof.
Chun-Khiang Chua
(Chung Yuan Christian University)
Flavour Physics and Fundamental Symmetries
Poster
We estimate the long-distance contribution to the width difference Delta Gamma_s in the B_s- Bbar_s system from color-allowed two-body and three-body modes. For two-body modes, in addition to the usual D_s^(*) Dbar^(*)_s states, modes with excited states, D^(*)_{s0,s1}, are also included. We find that the contributions from the latter and three-body D^(*)_s Dbar^(*) Kbar^(*) modes are...
Dr
Biagio Di Micco Di Micco
(CERN)
QCD
Poster
We present the measurement of the muon inclusive differential cross section dSigma/dpT in pp collisions at sqrt(s) = 7 TeV. The analysis is performed in the pseudorapidity interval |eta| <2.5 for muon of transverse momentum 4 < pT < 100 GeV. The data have been recorded using different configurations of the level-1 muon trigger for an integrated luminosity of 1.4 pb-1. The result is compared...
Mme
Carolina Gabaldon
(CERN)
Accelerators
Poster
The luminosity is measured in ATLAS by several detectors and methods, both online and offline.
This poster will present briefly the luminosity detectors in ATLAS and explain in some detail
how they were used to extract and publish luminosity during the 2010 data taking. One of the
challenges in measuring the luminosity at the LHC comes from the fact that many interactions
typically occur...
Dr
Antonio BARONCELLI
(INFN/Roma TRE)
QCD
Parallel session talk
Measurements of W+jets and Z+jets cross sections (including the case where at least one jet contains a b-hadron) in proton-proton collisions with the ATLAS detector are reported. Cross sections, in both the electron and muon decay modes of the bosons, are presented as a function of jet multiplicity and of the transverse momentum of the leading and next-to-leading jets in the event....
Clemens Lange
(DESY)
Top and Electroweak Physics
Poster
The measurement of the top-quark pair production cross-section is a powerful tool to test the Standard Model (SM) at a new energy. With the recent advances in theoretical calculations that led
to predictions at a precision level of 10\%, this
measurement particularly provides a precision test of the theory of Quantum Chromodynamics.
At the same time, the decays of top-quark pairs are...
Hovhannes Khandanyan
(UI Urbana)
Top and Electroweak Physics
Poster
We present a measurement of the production cross section of top quark pairs in proton-proton collisions at sqrt(s) = 7 TeV recorded with the ATLAS detector at the CERN Large Hadron Collider. Using the 2011 ATLAS dataset, candidate events are selected in the dilepton topology with large missing transverse energy and at least two jets.
In this analysis backgrounds from Z->ll and...
Andreas Petridis
(ATLAS)
Top and Electroweak Physics
Poster
A measurement of ZZ production cross section in proton-proton collisions at sqrt{s} = 7 TeV using ~1 fb-1 of data collected by the ATLAS experiment at the LHC is presented. In this poster we discuss in detail the systematic uncertainties to the cross section measurement, and the data driven background estimate technique, which is also used in the
measurement of the WZ production cross...
Sunil Bansal
(University of Antwerp, Antwerpen, Belgium)
QCD
Poster
A measurement of underlying events (UE) using Drell-Yan (DY) process around Z-resonance, is performed in proton-proton collision at centre of mass energy $\sqrt{s}$ = 7 TeV using data collected by CMS experiment at the LHC during the year 2010 and corresponding to an integrated luminosity of 36 pb$^{-1}$. %Experimentally, it is difficult to separate hard and soft components in most of the...
M.
HERBERT ROHRINGER
(Inst HOCHENERGIEPHYSIK WIEN AUSTRIA)
QCD
Poster
The Υ production cross section in proton-proton collisions at √s = 7 TeV is measured using a data sample collected with the CMS detector at the LHC. We also report the measurement of the Υ(1S), Υ(2S), and Υ(3S) differential cross sections as a function of transverse momentum and rapidity.
Prof.
George W.S. Hou
(National Taiwan University)
Flavour Physics and Fundamental Symmetries
Poster
CPV measurment in Bs -> J/psi phi at the Tevatron, sin2Phi_Bs, hint at new physics, with the 4th generation the simplest explanation. At the same time, great progress is made already at the LHC for the direct search of 4th generation quarks. We show that a precise measurement of sin2Phi_Bs by LHCb, together with a measurement (combining LHCb, ATLAS and CMS) of Bs -> mu+mu- at slightly above...
Noureddine Mebarki
(Mentouri University)
Poster
New cosmological aspects of Seiberg-Witten noncommutative geometry (NCG) are discussed and an FRW like model is presented. The NCG black hole apparent horizon is determined and the corresponding Hawking temperature is obtained by a Kodama like observer via the tunelling effect. Moreover, it is shown that because of the torsion and anisotropy generated by NCG, a new mechanism explaining...
Dr
Oliver Rosten
(University of Sussex)
Poster
Using scalar field theory as a template, I will discuss new insights into the structure of theory space emerging from the Exact Renormalization Group. I will outline how conformal symmetry is realized in this framework and then discuss the spectrum of fixed-points and how this is tied up with the renormalization of composite operators. Finally, I will mention possible constraints on asymptotic...
Dr
Zhao-Ting PAN
(LPSC Grenoble)
Flavour Physics and Fundamental Symmetries
Poster
The measurements of inclusive semileptonic B-meson decays allow a precise
determination of the CKM matrix elements |V_{ub}| and |V_{cb}|, relevant
for the study of flavor and CP violation in the quark sector. This requires,
from the theoretical counterpart, the calculation of the NNLO corrections
to differential decay distributions, from which it is possible to derive
predictions for...
Zhao-ting Pan
(LPSC Grenoble)
Top and Electroweak Physics
Poster
The measurements of inclusive semileptonic B-meson decays allow a precise
determination of the CKM matrix elements |V_{ub}| and |V_{cb}|, relevant
for the study of flavor and CP violation in the quark sector. This requires,
from the theoretical counterpart, the calculation of the NNLO corrections
to differential decay distributions, from which it is possible to derive
predictions for...
Dr
Carla Distefano
(LNS-INFN)
Astroparticle Physics
Poster
ANTARES is currently the largest neutrino detector on the Northern Hemisphere. Operating since May 2008 in its full configuration, it aims to detect high-energy cosmic neutrinos.
In the absence of an astrophysical standard candle, a possible way to measure the angular resolution and the pointing accuracy for a neutrino telescope is to look at “Moon shadow” in the atmospheric muon flux. The...
Dr
Valery Lyuboshitz
(Joint Institute for Nuclear Research ( Dubna, Russia ))
Poster
The coherent inelastic processes of the type a --> b, which may take place in the interaction of hadrons and $\gamma$ quanta with nuclei at very high energies (the nucleus remains the same), are theoretically investigated. For taking into account the influence of matter inside the nucleus, the optical model, based on the conception of the refraction index, is used .
Analytical formulas for...
Diego Aristizabal
(Universite de Liege)
Neutrino Physics
Poster
In the standard seesaw mechanism, finite corrections to the neutrino mass matrix arise from one-loop self-energy diagrams mediated by a heavy neutrino. In this talk I will discuss the impact that these corrections may have in the different entries of the tree-level neutrino mass matrix, paying special attention to their dependence with the seesaw model parameters. It will be shown that due to...
Manuela Vecchi on behalf of the ANTARES Collaboration
(CPPM)
Astroparticle Physics
Poster
The ANTARES Collaboration has developed a Target of Opportunity strategy to enhance the detection prospects to transient sources of high energy neutrinos, searching for an optical counterpart associated either to a single neutrino of high energy, either to a doublet of events in space and time coincidence.
The ANTARES alert system can trigger the observation with
a network of optical...
Prof.
Ali N. khorramian
(Semnan university and IPM)
QCD
Poster
In this article we present the results of our QCD analysis for
proton structure function $F_{2}^{p} (x,Q^2)$ in order to
determine the parton distributions at next-to-leading order (NLO)
of QCD. We also study the heavy quark contributions to the proton
structure function $F_2^i(x,Q^2)$, with $i$ = $c$, $b$ within the
framework of the so called `fixed flavor number scheme' (FFNS)
parton...
Joana Machado Miguéns
(LIP (Lisbon))
Detector R & D and data handling
Poster
ATLAS has been successfully collecting 7 TeV pp collision data from the LHC since 2010, at a rate that will ultimately reach 40 MHz for nominal LHC conditions. The ATLAS trigger system handles this enormous data flow, providing efficient rejection and maintaining an unbiased efficiency for rare signals.
It is organized in three levels that reduce the rate to approximately 200 Hz, by...
Frank Seifert
(TU Dresden)
Top and Electroweak Physics
Poster
Identification and reconstruction of hadronically decaying tau leptons is essential for many physics studies at the LHC, e.g. searches for new physics like the Higgs boson. In about 35% of the cases tau leptons decay leptonically into electrons or muons and in about 65% of the cases they decay hadronically.
Since it is impossible to distinguish the leptonically decaying tau leptons from...
Daci Nadir
(Cern)
Detector R & D and data handling
Poster
The CMS high-resolution electromagnetic calorimeter (ECAL)
comprises 75848 lead tungstate (PbWO4) crystals and is
optimized for the discovery of the SM Higgs boson in its twophoton
decay mode. With the unprecedented collision rate at
the Large Hadron Collider (LHC), the electron/photon (EG)
Trigger plays a major role in selecting the collisions most
likely to yield something new and...
Dr
Kirika Uchida
(Universität Bonn)
Top and Electroweak Physics
Poster
Many physics analyses with the ATLAS detector expect to have jets originating from b-quarks. Algorithms that allow to identify those jets are thus of great importance and it is crucial to understand their performance, namely the b-tagging efficiencies, misidentification efficiencies and calibration.
The final state of single lepton top pair decays is characterized by at least four jets...
Dr
Michael Sarrazin
(University of Namur (FUNDP))
Poster
We show that at low energy, any multidimensional universe containing two branes can be described as a two-sheeted spacetime in the formalism of the noncommutative geometry. This equivalence implies a model-independent phenomenology.
Matter swapping between two branes is predicted through fermionic oscillations at very low energy. This phenomenon can be experimentally studied with present-day...
Dr
tomas Jezo
(LPSC)
Higgs and New Physics
Poster
We present the phenomenology of a class of models with an extended electroweak gauge group of the form SU(2)xSU(2)xU(1), often denoted as G(221) models. This includes Grand Unified Theory motivated models such as "left-right" as well as "non-universal" models. Given the most recent bounds on the parameter space derived from the low-energy precision measurements, we show expected signals for...
Adrien Besse
(LPT Orsay / Soltan Institute for Nuclear Physics)
QCD
Poster
Exclusive leptoproduction of vector mesons has been the subject of recent significant progress, both theoretically and experimentally. In particular, the hard regime with a highly virtual photon exchange allows to separate a short distance dominated amplitude of hard subprocess from suitably defined hadronic objects. However, a consistent picture is still missing, in particular for...
Mauro Verzetti
Higgs and New Physics
Poster
The importance of decays of new particles to taus led to the development of innovative tau reconstruction programs by the CMS collaboration. The performance of tau reconstruction algorithms, their validation by the measurement of isolated taus from vector boson decays and searches for new physics processes, e.g., MSSM higgs decays to taus, will be discussed.
Dr
Valery Lyuboshitz
(Joint Institute for Nuclear Research ( Dubna, Russia ))
Poster
Spin correlations for the $\Lambda \Lambda$ and
$\Lambda \bar{\Lambda}$ pairs, generated in relativistic
heavy ion collisions, and related angular correlations at the
joint registration of hadronic decays of two hyperons, in which
space parity is not conserved, are analyzed. The correlation
tensor components can be derived from the double angular
distribution of products of two decays by...
Miguel Pato
(Universita' Padova / IAP Paris / ITP Zurich)
Astroparticle Physics
Parallel session talk
We investigate the reconstruction capabilities of Dark Matter properties from future ton-scale direct detection experiments using several targets. Adopting realistic values for the exposure, energy threshold and resolution of Dark Matter experiments which will come online within 10 years, the degree of complementarity between different targets is quantified. While a measurement of the Dark...
Dr
Subhayan Mandal
(University Of Liege)
Poster
We establish the equation of motion of pseudoscalar particles coupled to an electromagnetic field in a classical gravitational background through the use of conformal time and flat geometry. We show that in general the expansion of the universe leads to larger mixing than in a stationary universe. We also show that for a broad range of parameters, one can obtain a resonance mixing, i.e. a...
Christian Faerber
Detector R & D and data handling
Poster
The LHCb calorimeter comprises the scintillator pad detector, preshower, electromagnetic Shashlyk type (ECAL) and hadronic Tile calorimeters, arranged in pseudo-projective geometry. All the four detectors follow the general principle of reading the light from scintillator tiles with wave-length shifting fibers, and transporting the light towards photomultipliers, all following the 25 ns...
Dr
Oliver Maria Kind
(Humboldt University Berlin)
Top and Electroweak Physics
Poster
The electro-weak production of single top quarks is of great interest for many aspects in and beyond the standard model. The reconstruction of such events is a demanding task and requires skilful analysis methods in order to achieve a good background suppression. At ATLAS, a simple cut-based analysis is used for the reconstruction of single-top t-channel events, as well as more complex...
Dr
Luigi Scorzato
(ECT*)
Flavour Physics and Fundamental Symmetries
Poster
We report on preliminary non-perturbative computations of the renormalization constants in the RI-MOM scheme relevant for the lattice action with Nf=4 dynamical flavours currently used by the European Twisted Mass Collaboration (ETMC). The knowledge of these constants is necessary in order to extract physical quantities from the rich program of lattice QCD simulations being performed by the...
Dr
Martin Spinrath
(SISSA)
Flavour Physics and Fundamental Symmetries
Poster
We propose new classes of models which predict both tri-bimaximal lepton mixing and a right-angled Cabibbo-Kobayashi-Maskawa (CKM) unitarity triangle, alpha approximately 90 degrees. The ingredients of the models include a supersymmetric (SUSY) unified gauge group such as SU(5), a discrete family symmetry such as A4 or S4, a shaping symmetry including products of Z2 and Z4 groups as well as...
M.
Djamel GHAFFOR
(Laboratoire de Physique Théorique d'Oran)
Higgs and New Physics
Poster
We present a scalar extension of the Standard Model with two singlets. The first singlet is stable and will be considered as WIMP candidate and the second is unstable and will mix to the Higgs boson field. The WIMP candidate will have mass of few GeV (the DAMA/LIBRA and CoGenT collaborations). The Higgs boson decay modes into dark(hidden) sector is discussed.
Dr
Alex Martyniuk
(University of Manchester)
Higgs and New Physics
Poster
We present the search results for a light charged Higgs boson produced in top pair events and decaying into csbar in pp collisions at sqrt(s)= 7 TeV with the ATLAS detector. The analysis uses a data sample corresponding to an integrated luminosity of 35 pb^{-1}. The search is based on the semi-leptonic channel of ttbar candidates and analyzes the invariant mass distribution of two jets in the...
Xifeng RUAN
(LAL)
Higgs and New Physics
Poster
Using about 1 fb-1 of ATLAS data at 7 TeV proton-proton centre-of-mass energy taken in 2011, Higgs boson searches in the Higgs decay mode H → WW (∗) → lνlν (l = e, μ) have been performed with sensitivity exceeding anything currently available. Important sensitivity to Higgs bosons masses between about 140 and 180GeV is available. The results are also interpreted in a model with a fourth...
Mme
Sarah Heim
(Michigan State University)
Poster
We present a search for high mass dielectron resonances using 7 TeV pp collisions recorded by the ATLAS detector in 2011. The reconstructed invariant mass spectrum is compared to standard model expectations. Possible signals include heavy neutral gauge bosons and the Randall-Sundrum graviton. In the absence of a signal we set exclusion limits for various models using a Bayesian approach.
Simon Viel
(University of British Columbia - TRIUMF)
Poster
This poster describes the search for high mass mu+mu- resonances in pp collisions at sqrt(s) = 7 TeV at the LHC. A first search was conducted using data recorded by the ATLAS experiment during 2010, corresponding to a total integrated luminosity of 40 pb-1. No statistically significant excess above the Standard Model processes was observed in our search region of dimuon invariant mass above...
M.
Jeremiah Jet Goodson
(Stony Brook University)
Poster
The results of a search for supersymmetry in multilepton final states using the ATLAS detector is presented. Such signals require three or more leptons, jets, and missing transverse energy. This channel provides the advantage that the contribution due to standard model backgrounds is expected to be very low. Results from the 2011 data-taking will be reported.
Elena Ferri
(University of Milano Bicocca and INFN, Sezione di Milano-Bicocca)
Neutrino Physics
Poster
The Cryogenic Underground Observatory for Rare Events (CUORE) is an
experiment to search for neutrinoless double beta decay (0nuDBD) in
Te-130 and other rare processes. The observation of 0nuDBD would
indicate that neutrinos are Majorana particles and would provide
information about the absolute neutrino mass scale. CUORE is a
bolometric detector composed of 988 TeO2 crystals, with the...
Thorsten Dietzsch
(University of Heidelberg)
Poster
We present a search for physics beyond the Standard Model in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV, performed with the ATLAS Detector at the Large Hadron Collider (LHC). In 2010, no sign of new physics was observed in dijet mass and angular distributions and the world's best limits were set on a variety of models of new physics, including excited quarks, quark...
Predrag Milenovic
(ETH Zurich, Switzerland)
Poster
The results of searches for Supersymmetry in events with two same-sign isolated leptons, hadronic jets, and missing transverse energy in the final state are presented. The searches use pp collisions at 7 TeV collected in 2011 by the CMS experiment.
Xabier Anduaga
(Instituto de Fisica La Plata (CONICET -UNLP))
Poster
A variety of new physics models involving extra dimensions predict
photons in the final states from pp collisions at energies accessible at the Large Hadron Collider. The search for new particles in the diphoton channel, such as the Kaluza-Klein resonant mode of the graviton in the Randall-Sundrum model, carried out by the ATLAS experiment is presented. Event selection and optimization, as...
Miroslav Myska
(IP ASCR, Prague)
Top and Electroweak Physics
Poster
Searches for the kinematic selection criteria for
estimation of multiple parton interaction fraction in pp collisions
at \sqrt{s} = 14 TeV are presented using the eikonalization of the
cross section implemented in the HERWIG++ MC generator. W^+ boson
pair production is studied in the muon decay channel. Four types of
the main background processes are discussed and analyzed. These
include...
Carolina Deluca
(Stony Brook University)
Poster
Searches for the pair production of first and second generation scalar leptoquarks have been performed using 35 pb−1 of proton-proton collision data recorded by the ATLAS detector at sqrt(s) = 7 TeV, delivered by the LHC during 2010. We search for leptoquarks in events with two oppositely charged muons or electrons and at least two jets, and in events with one muon or electron, missing...
Dr
Monica D'Onofrio
(University of Liverpool)
Poster
Results are presented of a search for new physics in events with large missing transverse energy and heavy flavor jet candidates in √s=7 TeV proton-proton collisions recorded by the ATLAS experiment at the Large Hadron Collider in 2011. Events are required to contain energetic jets, of which one or two must be identified as a b-jet, large missing transverse energy and at least one isolated...
Mme
Jeanette Lorenz
(Fakultaet fuer Physik, LMU Muenchen)
Poster
One of the promising channels in the searches for Supersymmetry is the 1-lepton channel which requires one isolated electron or muon, multiple jets and a high Missing Transverse Energy. Some SM processes like top, W and QCD can show similar experimental signatures. The magnitude of these backgrounds must be understood well. Various methods to estimate these backgrounds are presented.
Mme
Angelika Georgakopoulou
(NTUA)
Astroparticle Physics
Poster
A High Spectral Resolution Lidar (HSRL) design study, which will lead to a prototype, is being developed for atmospheric monitoring in Ultra High Energy Cosmic Ray Observatories aiming to improve the accuracy of the measurement of the differential scattering coefficients of the aerosol and clouds in near UV region. The specification studies of the candidate Fabry-Perot receivers for the...
Dr
Airton Deppman
(São Paulo University)
Poster
The statistical approach first proposed by Hagedorn was suceesful in the interpretation of many aspects of high energy hadron collisions. One important result of Hagedorn's theory~\cite{Hagedorn} is the existence of a critical temperature, $T_c$, above which the composed system, the so-called fireball, is impossible to go.
However, when still higher energies were available at new...
Daniel Muenstermann
(CERN)
Neutrino Physics
Poster
The determination of two important properties of the neutrino is still pending: its rest mass and its nature - Dirac or Majorana particle. The observation of neutrinoless double beta decay would clarify both, but the expected half-life of more than 10^25 years for this decay is an ambitious challenge.
Recently, first experiments have been commissioned that will be able to probe this...
M.
Benjamin Jones
(Massachusetts Institute of Technology)
Neutrino Physics
Poster
The high resolution 3D tracking offered by liquid argon time projection chambers make them an excellent candidate for future neutrino detectors in the next generation of long baseline experiments. In order to utilize this emerging detector design for such experiments, the scalability and physics capabilities of the technology must be proven.
The MicroBooNE experiment is a 170 ton liquid...
Essma REDOUANE-SALAH
(Physics)
Detector R & D and data handling
Poster
The electronic states of an atom in a uniform electric field are modified by the Stark effect. If the field is strong enough, ionization of the atom eventually occurs due to the tunnel effect.
In the case where the electron is initially in a state of orbital angular momentum < L > perpendicular to the field F, it was expected that the transverse velocity of the extracted electron is in...
Dr
David Emmanuel-Costa
(Instituto Superior Tecnico, Lisboa, Portugal)
Poster
The idea of grand unification in a minimal supersymmetric SU(5)xSU(5) framework is revisited. It is shown that the unification of gauge couplings into a unique coupling constant can be achieved at a high-energy scale compatible with proton decay constraints. This requires the addition of a minimal particle content at intermediate energy scales. In particular, the introduction of the SU(2)_L...
Dr
Luis Gonzalez-Mestres
(LAPP)
Astroparticle Physics
Poster
It is not yet clear whether the observed flux suppression for ultra-high energy cosmic rays (UHECR) at energies above 4.10E19 eV (AUGER, HiRes) is a signature of the Greisen-Zatsepin-Kuzmin (GZK) cutoff or corresponds to the maximum energies available at the relevant sources. Both phenomena can be sensitive to violations of standard special relativity modifying cosmic-ray propagation or...
Danilo Enoque Ferreira de Lima
(University of Glasgow)
Detector R & D and data handling
Poster
The online event selection is crucial to reject most of the events containing uninteresting background collisions while preserving as much as possible the interesting physical signals. The b-jet selection is part of the trigger strategy of the ATLAS experiment and a set of dedicated triggers is presently contributing to the event selection for the 2011 running.
The b-jets acceptance is...
Dr
Alexey Guskov
(Joint Institute for Nuclear Research)
QCD
Poster
The COMPASS experiment at CERN uses either muon or hadron beams with a longitudinally or transversely polarized solid target, liquid hydrogen or heavy nuclear targets. The COMPASS Collaboration has recently submitted a proposal for additional measurements in the next years. The proposal (COMPASS-II) was approved by the CERN Research Board in December 2010. It includes studies of: 1) Drell-Yan...
M.
Yung-Shun Yeh
(Institute of Physics, National Chiao Tung University)
Neutrino Physics
Poster
The Daya Bay Neutrino Experiment, located in Shenzhen, China, will be probing the last unknown neutrino mixing angle $\theta_{13}$ with a sensitivity of 0.01 or better in $\sin^{2}2\theta_{13}$ at 90% C.L. through a measurement of the relative rates and energy spectra of reactor antineutrinos at different baselines. This measurement will provide a better understanding of the neutrino mixing...
Dr
HERVE DE KERRET
(APC)
Neutrino Physics
Poster
The Double Chooz neutrino experiement is taking data at the French nuclear plant of Chooz, and will be very soon improving the world best limit on the teta 13 neutirno mixing angle, which is the last non measured measured oscillation angle.
This expeirment is the first of a new neutrino generation of experiment, and the only one currently taking data. These are Reno in Korea, Daya...
Prof.
Ali N. Khorramian
(Semnan university and IPM)
QCD
Poster
We describe the most recent H1 and ZEUS diffractive DIS data obtained by various methods with very large uncertainties associated with the treatment of proton dissociation processes and compare them in detail. We consider pomeron as an object with parton distribution function, evolving according to the DGLAP equations. Having performed a global t analysis, we achieve a very good description of...
Dr
Daniele Fargion
(Physics Departm Rome 1 INFN 1)
Neutrino Physics
Poster
Atmospheric neutrino may trace cosmic rays spectra, muon and electron neutrino secondaries and their final upgoing nature after mixing inside the Earth. The muon flavor change is oscillating in all directions and they are maximal in vertical axis at 24 GeV ; the upgoing muon neutrino rate and the neutral current or tau or electron showers at tens GeV should combine in a very tuned way in...
Prof.
Paul Newman (for the LHeC study group)
(University of Birmingham)
Detector R & D and data handling
Poster
This year the CERN-ECFA-NuPECC Conceptual Design Report on the Large Hadron Electron Collider (LHeC) will be released. This contribution describes design concepts for a new detector, which combines the demands of very high precision with those of large acceptance into a novel device for electron-proton physics at TeV energies. The physics and technical requirements, choices of detector...
Prof.
Ad van den Berg
(KVI/University of Groningen)
Astroparticle Physics
Poster
Authorship: The Pierre Auger Collaboration
The Pierre Auger collaboration uses its observatory in Argentina to study ultra-high energy cosmic rays (E> 1 EeV). The baseline detectors are a surface detector array with 1660 water-Cherenkov detectors distributed over an area of 3000 km2 overseen by 24 fluorescence telescopes mounted at the perimeter of this array. Recently, the collaboration has...
Dr
Valeriy Dvoeglazov
(Universidad de Zacatecas)
Poster
The Bargmann-Wigner procedure for constructions spin-1 and spin-3/2 fields are well described in the textbooks. We modify this procedure based mainly on the motivations of the ideas of dual electrodynamics and the possibility of the QFT construct with the bosons of opposite parities, and the necessity to have the causal behaviour of the corresponding particles (even in the presence of external...
Denis Parganlija
(Frankfurt University - Institute for Theoretical Physics)
QCD
Poster
Current experimental data provide us with five scalar isoscalar meson states in the low-energy region, i.e. the region up to 1.8 GeV: f0(600), f0(980), f0(1370), f0(1500) and f0(1710). The issue of the structure of these states (quark-antiquark, tetraquark, meson-meson molecules...) has been extensively, but not conclusively, debated in the last decades. We use a U(3)xU(3) Linear Sigma Model...
Dr
Nicolas Arnaud
(LAL)
Detector R & D and data handling
Poster
The SuperB experiment is a next generation Super Flavour Factory
expected to accumulate 75ab^-1 of data at the Y(4S) in five
years of nominal running. In addition to running data at the
Y(4S), SuperB will be able to accumulate data from the psi(3770)
up to the Y(6S). A polarized electron beam enables unique
physics opportunities at SuperB. We discuss the detector design
for this new facility.
Prof.
Elşen Veli Veliev
(Department of Physics , Kocaeli University)
QCD
Poster
In this study, we investigated the temperature dependence of mass and leptonic decay constants for pseudoscalar heavy quarkonium states. We take into account the additional operators in the Wilson expansion at finite temperature and calculate thermal spectral density in the QCD side. Analysis of obtained thermal QCD sum rules shows that at critical temperature, the decay constant decreases...
Dr
Adrian Bevan
(Queen Mary University of London)
Flavour Physics and Fundamental Symmetries
Poster
CP violation in the charm sector at the precisions accessible by current experiments could be a signature for new physics. So far, time-integrated measurements have provided upper limits in the 1% region, and D0 mixing studies limit any weak mixing phase to be less than 10 or 20 degrees. Future experiments are expected to provide greater precision and may be able to explore time-dependent CP...
Diane Cinca
(Laboratoire de Physique Corpusculaire Clermont-Ferrand (LPC)-In)
Top and Electroweak Physics
Poster
The top quark has been discovered in 1995 at Fermilab. Being the heaviest known elementary particle, it plays a special role in the Standard Model. The LHC produced first pp collisions at 7 TeV centre-of-mass energies in fall 2009. The top quark was observed in both experiments ATLAS and CMS during 2010.
First top mass measurement by ATLAS have been made using 35 pb-1 of data recorded in...
Dr
Daniele Fargion
(Physics Departm Rome 1 INFN 1)
Astroparticle Physics
Poster
UHECR do not arrive from Virgo, do cluster in a spread way around Cen A, do show a nuclei composition. The recent arrival event maps do not confirm an Super Galactic plane arrival as expected on early 2007. To solve the puzzle we suggest a light nuclei UHECR nature whose fragmentation on flight from Virgo make them suppressed, whose spread bending on galactic plane agrees with Cen A cluster,...
Dr
Conrado Albertus-Torres
(Departamento de Física Fundamental. Universidad de Salamanca)
Flavour Physics and Fundamental Symmetries
Poster
Accuracy on the measurement of the Cabbibo - Kobayashi - Maskawa matrix elements demands a detailed knowledge of semileptonic decays of b -hadrons. In particular, decays involving orbitally excited c-mesons provide an important contribution to the total semileptonic width. Therefore, a better understanding of these processes will reduce the uncertainties in the above mentioned matrix elements....
Dr
Antonio Baroncelli
(INFN / Roma TRE)
Top and Electroweak Physics
Parallel session talk
We present a measurement of the Z boson forward-backward asymmetry of the process pp --> γ*/Z + X -> l+l- + X in collisions at sqrt(s) = 7 TeV, where l= e or muon. The asymmetry is measured in the Collins-Soper frame using the angle θ between the incoming quark and outgoing lepton. The measurement uses recent data from the ATLAS experiment. At high dilepton invariant mass, the measurement is...
