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Rencontres de Moriond EW 2009

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La Thuile

La Thuile

Rencontres de Moriond Planibel Hotel - La Thuile Aosta Valley 11016 La Thuile (Aosta), Italy Phone : 39 (0)1 65 88 45 41 Fax : 39 (0)1 65 88 45 35
Jean Marie Frere (ULB Brussels), Lydia Iconomidou-Fayard (LAL)
Description

The XLIVth Rencontres de Moriond session devoted to ELECTROWEAK INTERACTIONS AND UNIFIED THEORIES will be held in La Thuile from Saturday March 7th to Saturday March 14th, 2009. La Thuile is a pleasant winter sport resort located in the Italian Alps, at 1450 m alt., about 120 km from Geneva. The nearest international airport is Geneva (Switzerland). If you arrive in Geneva International Airport, do not forget that you* may need a transit visa, coming through Switzerland to Italy.

Since its foundation in 1966 by Jean Tran Thanh Van, the Rencontres de Moriond bring together theorists and experimentalists for in-depth discussions on recent findings and new ideas in elementary particle physics in a pleasant, relaxed and intimate atmosphere.

The meeting is intended to promote fruitful collaboration between experimentalists and theorists and between various institutions by bringing together a limited number of physicists and astrophysicists in beautiful and inspiring surroundings.

This session is devoted to electroweak interactions and to unified theories.
The Rencontres de Moriond are sponsored by

document
Support
  • dim. 8 mars
    • SM and beyond at colliders: Sunday AM
      • 08:25
        Welcome address
      • 1
        W and Z masses and production properties
        Orateur: Dr Jan Stark (LPSC Grenoble, CNRS/IN2P3)
        Slides
      • 2
        Diboson physics
        Orateur: M. Thomas Phillips (Duke univ. Durham NC USA)
        Paper
        Slides
      • 3
        Standard Model Physics with ATLAS and CMS
        The study of Standard Model (SM) physics is very important at the LHC. Before any discovery can be claimed a detailed understanding of the detectors should be reached and benchmark SM processes should be measured. A precise measurement of the various parameters is crucial as a consistecy check of the SM. Moreover, SM processes can be directly sensitive to new physics, they will allow to test QCD predictions and measure PDFs and are backgrounds for many new physics channels. In this report, the status of some analysis at ATLAS and CMS is reported focusing on W and Z inclusive cross sections and on W and top quark mass measurements. Results on early data (awaited before the end of the year) are also shown.
        Orateur: Dr Fabrizio Petrucci (Universita' Roma Tre - Dipartimento di Fisica)
        Paper
        Slides
      • 09:35
        Tea or coffee break
      • 4
        Readiness of the ATLAS Experiment for First Data
        The ATLAS detector is one of the experiments at the LHC that will detect high-energy proton collisions at 14 TeV. The commissioning of the detector has started already in 2005 in parallel to the detector installation and is still in progress. The data taken corresponds to noise runs, cosmic muon events and beam background events from single beam in September 2008. We present the current status of the detector and performance results obtained during commissioning.
        Orateur: M. Thilo Pauly Pauly (CERN)
        Paper
        Slides
      • 5
        QCD and backgrounds for LHC
        Orateur: Mlle Giulia Zanderighi (Oxford Univ., UK)
        Slides
      • 6
        Readiness of the CMS Detector for First Data
        The CMS Detector completed the first phase of commissioning in September 2008. The detector, data acquisition and distribution, reconstruction and analysis chains were successfully commissioned in a first phase with cosmic ray triggers. On September 10, 2008 CMS captured the first events from the LHC beam. In the following few days the experiment accumulated many beam-splash and beam halo events from circulating beams. After the LHC setback on September 19th, CMS went back to cosmics operation. Continuous running with full magnetic field and the tracker detectors in full swing allowed the collection of large samples of muon tracks to be used for alignment and calibration, and improved the stability and efficiency of data taking. I will present results of the analysis of data from the three phases, which have enabled establishing good starting points for time and space alignment, and accuracy of detector measurements. I will subsequently discuss the status of the detector, and prospects for the collider run in 2009-2010.
        Orateur: Emilio Meschi (CERN)
        Paper
        Slides
    • SM and beyond at colliders: Sunday PM
      • 7
        EW physics at HERA
        Orateur: Mlle Nao Okazaki (KEK)
        Paper
        Slides
      • 8
        High mass SM Higgs (Tevatron)
        Orateur: M. Douglas Benjamin (Duke University,Durham - NC USA)
        Proceedings(figure 1)
        Proceedings(figure 2)
        Proceedings(figure 3)
        Proceedings (pdf)
        Proceedings(source)
        Slides
      • 9
        Low mass SM Higgs (Tevatron)
        Orateur: M. Yuji Enari (LPNHE, Paris, France)
        Slides
      • 10
        Higgs Physics and Beyond the SM at ATLAS/CMS
        Perspective searches for Higgs bosons and new particles expected by supersymmetric and extra dimension models are presented in the context of current strategies of the CMS and ATLAS experiments. An excess of events will be looked for in the first data taking period at LHC as an indication of the existence of new particles. Focus is on the potential both of the discovery and of the exclusion in the main decay channels. A combination of the most important analyses is also presented.
        Orateur: Dr Nicola De Filippis (LLR - Ecole Polytechnique)
        Paper
        Slides
      • 11
        Revisiting the Global Electroweak Fit of the Standard Model and Beyond with Gfitter
        The global fit of the Standard Model to electroweak precision data, routinely performed by the LEP electroweak working group and others, demonstrated impressively the predictive power following from electroweak unification. We have revisited this fit in view of (i) the new generic fitting package Gfitter, developed to allow flexible model testing in high-energy physics, and (ii) a more thorough statistical interpretation of the results. Gfitter is a modular fitting toolkit, which features predictive theoretical models as independent plugins,and a statistical analysis of the fit results using toy Monte Carlo techniques. The state-of-the-art electroweak Standard Model is fully implemented, as well as generic extensions to it. Theoretical uncertainties are explicitly included in the fit through scale parameters varying within given error ranges. This talk introduces the Gfitter project, and presents the most recent results for the global electroweak fit in the Standard Model, and for a model with an extended Higgs sector (2HDM).
        Orateur: M. Martin Goebel (DESY / University of Hamburg)
        Latex
        Paper
        Slides
      • 18:30
        Tea or coffee break
      • 12
        BSW Higgs (Tevatron)
        Orateur: M. Abid Patwa (Brookhaven National Lab NY USA)
        Paper
        Slides
      • 13
        Searches in lepton final states
        Orateur: M. Marc Hohlfeld (Universität Mainz, Germany)
        Material
        Paper
        Slides
      • 14
        Searches for new physics at the Tevatron in photon and jet final states
        Photons and jets are the most copiously produced particles at the Fermilab Tevatron. By analyzing events with photons and jets, we may search for hints of physics beyond the standard model of elementary paticles. Models which predict photon and jet signatures include SUSY, extra dimension, leptoquarks, etc. Both model-driven and signature-based searches have been performed. I will present the latest results using data from an integrated luminosity of 1.0--2.5/fb of p-pbar collisions at sqrt(s)=1.96 TeV, collected with the CDF and D0 detectors.
        Orateur: Dr Shin-Shan Yu (Fermi National Accelerator Laboratory)
        Paper
        Slides
      • 15
        Beyond SM : noncommutative approach
        Alain Connes' noncommutative geometry (NCG) allows to unify the classical Yang-Mills-Higgs theory and General relativity in a single geometrical framework. This unification implies restrictions for the couplings of the Standard Model (SM) at a given cut-off energy which reduce the degrees of freedom compared to the classical SM. I will give an introduction to the basic ideas of NCG and present models beyond the SM that are compatible with NCG and produce phenomenologically interesting extensions of the SM.
        Orateur: Dr Christoph Stephan (Institut für Mathematik, Universität Potsdam)
        Proceedings
        Slides
  • lun. 9 mars
    • Flavour physics: Monday AM
      • 16
        Search for new Physics at HERA
        Orateur: Mlle Thi Nguyet Thrinh (LPNHE, Paris, France)
        Paper
        Slides
      • 17
        Review of phi1,phi2,ph3 measurements
        Orateur: Dr Karim Trabelsi (KEK)
        Paper
        Slides
      • 18
        Radiative and electroweak penguin measurements at B-factories
        Belle and BaBar have been exploring radiative and electroweak B meson decays that are sensitve to physics beyond the Standard Model, and the CKM unitarity triangle parameters within the context of the Standard Model. In this talk I review the latest measurements on inclusive and exclusive b -> s gamma and b -> d gamma processes and exclusive b -> s l+ l- processes, and discuss their implications.
        Orateur: Prof. Mikihiko Nakao (KEK)
        Paper
        Slides
      • 19
        Mixing and DeltaGamma_s, Tevatron
        Orateur: Dr Avdhesh Chandra (UC Riverside)
        Slides
      • 09:55
        Tea or coffee break
      • 20
        New perspectives for heavy flavour physics from the lattice
        We give a short account of the present status of the computation of QCD matrix elements needed for connecting experimental B- and D-meson decays to the fundamental electroweak Lagrangian. We then emphasise present developments, in particular the European Coordinated Lattice Simulations. These provide perspectives for precision determinations with all sources of errors accounted for.
        Orateur: Dr Rainer Sommer Sommer (DESY)
        Paper
        Slides
      • 21
        Review of Vub and Vcb
        Orateur: M. Fabrizio Bianchi (Dipartimento di Fisica Sperimentale, Turin, Italy)
        Paper
        Slides
    • Flavour physics: Monday PM
      • 22
        Readiness of the LHCb experiment for first data
        The talk deals with the present status of the LHCb detector, with special emphasis on the commissioning tests and analysis. The detector response has been widely tested by means of cosmic ray events and with the very first beam before the LHC rupture in September 2008. The results of these studies are reported. Finally, ideas on the planned use of the first beam data, expected in 2009, are presented.
        Orateur: Dr Adriano Lai (INFN)
        Paper
        Slides
      • 23
        Symmetries and Asymmetries of B -> K* mu+ mu- Decays in the Standard Model and Beyond
        The rare decay B -> K* (-> K pi) mu+ mu- is regarded as one of the crucial channels for B physics as the polarization of the K* allows a precise angular reconstruction resulting in many observables that offer new important tests of the Standard Model and its extensions. These angular observables can be expressed in terms of CP-conserving and CP-violating quantities which we study in terms of the full form factors calculated from QCD sum rules on the light-cone, including QCD factorization corrections. We investigate all observables in the context of the Standard Model and various New Physics models, in particular the Littlest Higgs model with T-parity and various MSSM scenarios, identifying those observables with small to moderate dependence on hadronic quantities and large impact of New Physics. One important result of our studies is that new CP-violating phases will produce clean signals in CP-violating asymmetries. We also identify a number of correlations between various observables which will allow a clear distinction between different New Physics scenarios.
        Orateur: Mlle Aoife Bharucha (IPPP, Durham)
        Minutes
        Proceedings
        Slides
      • 24
        Lifetimes and rare decays (Tevatron)
        Orateur: M. Jonathan Lewis (Fermilab Batavia - IL)
        Slides
      • 25
        Hot Topics in BaBar
        This presentation covers the recent BaBar results on a search for a light Higgs decaying to mu+mu- in Y(3S) decays as well as the searches for charged lepton flavor violation in the decays Y(3S) -> l tau (l=e,mu) and of tau -> 3l (l=e,mu)
        Orateur: M. Joao Costa (phD)
        Paper
        Slides
      • 26
        Hot topic Belle
        Orateur: M. Andrzej Bozek (H. Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Cracow, Poland)
        Paper
        Slides
      • 18:35
        Tea or coffee break
      • 27
        4th generation and B decays
        Orateur: M. Amarjit Soni (Brookhaven National Lab , NY, USA)
        Slides
      • 28
        Review of rare decays (Babar & Belle)
        Orateur: Mlle Elisabetta Baracchini (University of California Irvine USA)
        Paper
        picture
        Slides
      • 29
        S4 and A4 -based flavour models
        Orateur: Dr Federica Bazzocchi (VU Amsterdam)
        Slides
  • mar. 10 mars
    • Flavour physics: the future
      • 30
        CKM fits as of winter 2009 and sensitivity to New Physics
        The BaBar and Belle experiments, at the B-factories SLAC-PEPII and KEK-B, have collected over the last decade an unprecedented sample of about 1300 million of $B_d-\bar B_d$ pairs at the $\Upsilon$(4S) resonance. At the same time the CDF and D0 experiments at TeVatron, with about 2.8/fb each, have performed extensive measurements on $B_s-\bar B_s$ mesons mixing. Right before the startup of data taking at LHC, and to a longer extent before the future experiments at Super-B factories, we present the status of the CKM matrix parameters, as of early March 2009, in the frame of the Standard Model. Using the same dataset and from our global fit, we perform a model independent analysis to set constraints on additional effective parameters accounting for possible New Physics effects and to evaluate the present allowed space for these effects both from $B_d$ and $B_s$ mesons.
        Orateur: Dr Vincent Tisserand (LAPP IN2P3 CNRS et Université de Savoie)
        Latex Source
        Paper
        proceedings Figures 1a
        proceedings Figures 1b
        proceedings Figures 2a
        proceedings Figures 2b
        Slides
      • 31
        CKM elements from squark-gluino loops
        We compute the finite renormalisation of the CKM matrix induced by gluino-squark diagrams in the MSSM with non-minimal sources of flavour violation. Stringent bounds on the flavour-off-diagonal elements of the squark mass matrices are obtained by requiring that the radiative corrections to the CKM elements do not exceed the experimental values. Our bounds on several flavour-changing trilinear terms are stronger than those from FCNC processes if gluino and squarks are heavier than roughly 500 GeV. We point out that it is possible to generate the CKM matrix and the quark masses of the first two generations radiatively from soft SUSY-breaking terms without violating present-day FCNC constraints.
        Orateur: M. Andreas Crivellin (TTP Karlsruhe)
        Paper
        Slides
      • 32
        Status of the Unitarity Triangle analysis
        The experimental efforts on flavor physics carried on by the B-factories and Tevatron experiments allows to test the Standard Model in the fermion sector. We present here the update of the Unitarity Triangle analysis, exploiting all the available information. Combining the direct measurements on sides and angles of the Unitarity Triangle, we determine the values of the CKM parameters $\bar{\rho}$ and $\bar{\eta}$ assuming the validity of the Standard Model. Thanks to the abundance of experimental information, the fit is overconstraint. This allows to determine bounds on NP parameters, simultaneously to the determination of UT parameters. Similarly, from the fit one can predict hadronic QCD parameters without relying on any theoretical calculation of hadronic elements.
        Orateur: Dr viola sordini (ETH Zurich)
        Proceedings
        Slides
      • 33
        Looking for New Physics - Prospects of B-Physics at LHCb
        With the startup of the LHCb experiment the next round of precision B experiments will be launched. LHCb has access to about 10^12 B meson decays per year allowing significant measurements of even very rare B decays and in particular the precision study of the Bs system. With the measurement of rates, kinematics and CP asymmetries of loop suppressed B decays LHCb will probe the quantum corrections predicted by the Standard Model. Many of the observables show large sensitivities to New Physics contributions. The presentation will summarize the prospects for the key measurements planned at LHCb.
        Orateur: Ulrich Uwer (Physikalisches Institut, Heidelberg University)
        Paper
        Slides
      • 09:50
        break
      • 34
        Review on flavor in a warped extra dimension
        Orateur: M. Matthias Neubert (Johannes Gutenberg University Mainz Germany)
        Slides
      • 35
        NA62: New Opportunities in Rare Kaon Decays
        There are three main directions in elementary particle physics. On the one hand experiments are made at the highest possible energies searching for the origin of electroweak breaking and direct evidence of New Physics (NP); a second line of attack aims to study the properties of the neutrinos, both of accelerator and cosmic origin, and of other astro-particle messengers. The third strategy is to explore the precision frontier looking for deviations from the Standard Model (SM) predictions in rare or forbidden processes. In this latter case, the sensitivity to NP originates from the virtual fluctuations that can involve all discovered and not yet discovered particles in higher order quantum loops and therefore can address, indirectly, energy scales even beyond those reachable at colliders. Some of the most interesting rare decays are those Flavour Changing neutral Currents (FCNC) that can be predicted with small hadronic uncertainty in the SM. There are only very few observables where sensitivity to NP and predictability within SM coexist. A very prominent example is given by the K --> pi nu nubar decays and it is precisely on this subject that the future CERN kaon physics strategy is being developed. The CERN proton complex is unique. The Super Proton Synchrotron (SPS) will remain in operation for the foreseeable future as LHC injector. This injection task should occupy only a few hours per day, leaving the SPS available to send 400 GeV/c primary protons to fixed target experiments for the rest of the time. I my talk I will present physics sensitivity of the NA62 experiment to study ultra-rare decays at the CERN-SPS and its present status.
        Orateur: M. Augusto Ceccucci (CERN)
        Paper
        Slides
      • 36
        The SuperB factory project
        Orateur: Dr Adrian Bevan (Queen Mary University of London)
        Slides
    • Flavour physics, top properties, lepton universality
      • 37
        CLEO's Impact on CKM
        In the six-quark Standard Model, flavor changing due to the weak force is described by a unitary transformation represented by the 3 × 3 matrix, known as the Cabibbo-Kobayashi-Maskawa (CKM) matrix. The elements of this matrix, constrained theoretically by unitarity, must be determined experimentally. By investigating e+ e- collisions around the charm-quark threshold, the CLEO-c experiment has gleaned results relevant to the elements Vcs , Vcd , Vub , and Vcb from semi-leptonic, leptonic, and multi-hadronic decays of D mesons. We present these results.
        Orateur: Philip Rubin (George Mason University)
        Slides
      • 38
        Measurement of top quark properties at the Tevatron
        I will cover results from CDF and DZero on top quark properties, specifically the top mass, top charge, W helicity in top decays, and top anomalous couplings.
        Orateur: Prof. Meenakshi Narain (Brown University)
        Slides
      • 39
        t-tbar production, etc (Tevatron)
        Orateur: M. Thomas Schwarz (University of California Davis USA)
        Paper
        Slides
      • 40
        Single Top Physics at the Tevatron
        We present the first observation of the single top quark production at the Fermilab Tevatron experiments, CDF and D0. After applying the event selection, there is a small expected signal hidden under large and uncertain backgrounds.In order to further separate signal from background events, highly sophisticated methods are needed. The results of the different analyses performed by both collaborations are shown here. Searches for non-standard-model single top-quark production are also discussed.
        Orateur: Dr Enrique Palencia (Fermilab)
        Paper
        Slides
      • 41
        Flavor violation in SUSY
        I review opportunities from flavor physics for collider searches and b-physics.
        Orateur: Gudrun Hiller (Dortmund)
        proceedings -PDF
        Slides
      • 42
        A stringent test of $\mu-e$ universality in $K\rightarrow l\nu$ decays by NA62 at CERN
        The SM prediction for the ratio of purely leptonic decay rates of the charged kaon $R_K=\Gamma(K_{e2}/\Gamma(K_{\mu2}))$ has an excellent sub-permille precision. Due to the helicity suppression of the SM contribution, the ratio is sensitive to non-SM effects; in particular, LFV contributions in the MSSM can modify it by a few percent without contradicting any other presently known experimental constraints. Current experimental precision is limited to 4.5%, and is insufficient for a stringent SM test. The NA62 experiment at the CERN SPS is aiming at improving the precision by almost an order of magnitude, using a dedicated data set collected in 2007/08. The status of the analysis will be discussed in detail.
        Orateur: Dr Andreas Winhart (University of Mainz)
        Paper
        Slides
    • Young Scientists Forum 1
      • 43
        Early Measurement of the W and Z Cross Sections in the Electron Decay Channels with CMS
        Measurements of the inclusive cross-sections of W and Z in the electron decay modes will be among the first results from the LHC. An overview of the motivation and plans for such measurements with CMS will be presented, with emphasis on describing the use of data-driven methods for efficiency and background determination.
        Orateur: David Wardrope (Imperial College London)
        Paper
        Slides
      • 44
        ZZ → l l nu nu production ( D0 )
        Orateur: M. Emanuel Strauss (SUNY Stony Brook USA)
        Paper
        Slides
      • 45
        Measurement of Z → mumu cross section in LHC
        One of the first measurements at the LHC will be th Z boson production cross section in proton proton collisions. The different decay channels of the Z boson will also used in the initial data taking period as benchmark process for the calibration of detectors and performance measurements. The overall cross section pp→Z→mu+mu- measurement with first data in ATLAS is discussed.
        Orateur: M. Roberto Di Nardo (University & INFN Roma Tor Vergata)
        Paper
        Slides
      • 46
        Unification in Higher Dimensional Scenario
        In this talk, I will briefly describe how the characteristics of gauge, Yukawa and quartic coupling evolution change in the presence of universal extra dimensions. The gauge coupling unification scale depends on compactification radius R, and is much lower in comparison to the four-dimensional case. Later, I will mention that the supersymmetric extension of this scenario requires a much larger value of $R^-1$, in order that the gauge couplings remain perturbative up to the unification scale.
        Orateur: Dr Swarup Kumar Majee (CP3-UCL)
        Paper
        Slides
      • 47
        First evidence of WW,WZ->l nu qq at Tevatron
        Orateur: M. Joseph Haley (Princeton University Princeton - NJ USA)
        Paper
        Slides
      • 48
        Hierarchical Soft Terms and Flavor Physics
        We study the framework of hierarchical soft terms, in which the first two generations of squarks and sleptons are heavier than the rest of the supersymmetric spectrum. This scheme gives distinctive predictions for the pattern of flavor violations, which we compare to the case of nearly degenerate squarks. Experiments in flavor physics have started to probe the most interesting parameter region, especially in $b\leftrightarrow s$ transitions, where hierarchical soft terms can predict a phase of $B_s$ mixing much larger than in the Standard Model.
        Orateur: M. Marco Nardecchia (SISSA)
        proceedings
        Slides
  • mer. 11 mars
    • Flavour Physics - Dark Matter
      • 49
        Results from KLOE
        Orateur: M. tommaso spadaro (KLOE/NA62)
        proceedings
        Slides
      • 50
        Search for an Ultra Light Higgs Boson in the Rare Decay $K_{L}\rightarrow\pi^{0}\pi^{0}\mu^{+}\mu^{-}$
        Using data collected by the KTeV Experiment at Fermi National Accelerator Laboratory in Batavia, Illinois, this study will be the first experimental analysis of $K_{L}\rightarrow\pi^{0}\pi^{0}\mu^{+}\mu^{-}$. Although this decay mode is possible within the Standard Model, it is limited to a very narrow band of phase space. The HyperCP Experiment has recently observed three $\Sigma^{+}\rightarrow{\it p}\mu^{+}\mu^{-}$ events within a narrow dimuon mass range of 213.8 MeV/$c^{2}$ to 214.8 MeV/$c^{2}$. This suggests that the process could occur via a neutral intermediary particle, $\Sigma^{+}\rightarrow{\it p}X^{0}\rightarrow{\it p}\mu^{+}\mu^{-}$, with an $X^{0}$ mass of 214.3 MeV/$c^{2}$$\pm$0.5 MeV/$c^{2}$. Since the $X^{0}$ has a light mass and a low interaction probability, then it is most likely a new neutral boson that exists beyond the Standard Model; potentially an ultra light higgs boson in the Next-to-Minimal Supersymmetric Standard Model (NMSSM). Recent theoretical predictions suggest that the decay mode $K_{L}\rightarrow\pi^{0}\pi^{0}\mu^{+}\mu^{-}$ can also occur via the aforementioned neutral boson: $K_{L}\rightarrow\pi^{0}\pi^{0}X^{0}\rightarrow\pi^{0}\pi^{0}\mu^{+}\mu^{-}$. Therefore, in addition to a Standard Model measurement, the search for $K_{L}\rightarrow\pi^{0}\pi^{0}\mu^{+}\mu^{-}$ is also carried out in an effort to address the viability of $X^{0}$ in explaining the HyperCP phenomena.
        Orateur: M. David Phillips (Graduate Student)
        Paper
        Slides
      • 51
        Heavy scalar dark matter : constraints and observability
        We investigate the possibility of having a TeV scale scalar dark matter candidate for different representations of SU(2)L. Aside from gauge interactions, scalar couplings are shown to play a key role. Their contributions to annihilation and DM-nucleon cross-sections are derived, and discussed in light of current direct and indirect dark matter detection experiments.
        Orateur: Dr Fu-Sin LING (Service de Physique Théorique - U.L.B. (Brussels))
        Paper
        Slides
      • 52
        The PAMELA Space Experiment
        On the 15th of June 2006, the PAMELA satellite-borne experiment was launched from the Baikonur cosmodrome and it has been collecting data since July 2006. The apparatus comprises a time-of-flight system, a silicon-microstrip magnetic spectrometer, a silicon-tungsten electromagnetic calorimeter, an anticoincidence system, a shower tail counter scintillator and a neutron detector. The combination of these devices allows precision studies of the charged cosmic radiation to be conducted over a wide energy range (100 MeV - 100's GeV) with high statistics. The primary scientific goal is the measurement of the antiproton and positron energy spectrum in order to search for exotic sources, such as dark matter particle annihilations. PAMELA is also searching for primordial antinuclei (anti-helium), and testing cosmic-ray propagation models through precise measurements of the antiparticle energy spectrum and precision studies of light nuclei and their isotopes. Moreover, PAMELA is investigating phenomena connected with solar and earth physics.
        Orateur: Dr Emiliano Mocchiutti (INFN (Istituto Nazionale di Fisica Nucleare) Trieste)
        Paper
        Slides
      • 53
        ATIC
        Orateur: M. Joachim Isbert (Louisiana State University Baton Rouge USA)
        Slides
      • 10:10
        break
      • 54
        Dark Matter and the PAMELA data
        Recent data from the PAMELA satellite and a number of balloon experiment have reported unexpected excesses in the measured fluxes of cosmic rays. Are these the first direct evidences for Dark Matter? If yes, which DM models and candidates can explain these anomalies and what do they imply for future searches? Is this all compatible with other constraints?
        Orateur: M. Marco CIRELLI (SPhT - CEA/Saclay)
        Paper
        Slides
      • 55
        Pamela and ATIC - an Astrophysicist View
        I review the astrophysical issues that are at the heart of the Pamela and ATIC observations. Specifically I stress the importance of diffusion and escape of Cosmic Rays from the Galaxy as well as the issue of cooling of Cosmic Ray leptons while traveling in the Galaxy. I summarize various astrophysical resolutions of these two observations. I then present a novel idea - the concentration of cosmic ray sources, SNRs, in the spiral arms (that was previously ignored) explains naturally both results in a model whose only parameters are direct observable quantities. That is - it is quite likely that both experiments don't require either new physics (WIMPS) or new Astrophysical sources.
        Orateur: Prof. Tsvi Piran (Racah Institute for Physics Hebrew University Jerusalem Israel)
        Slides
      • 56
        Antimatter cosmic rays : backgrounds or signals ?
        Recent PAMELA data seem to indicate an excess in positron cosmic rays around ~10 GeV that may be due to galactic Dark Matter particle annihilation. I will explain how the background of this signal is estimated and focus on the uncertainties that make our task difficult in constraining Dark Matter. I will explain how analysing simultaneously different cosmic ray particles is the only way to have an insight in the nature of Dark Matter.
        Orateur: M. Timur Delahaye (LAPTh (Annecy, France))
        Paper
        Slides
    • Dark Matter
      • 57
        Dark matter: the MiMac project
        Orateur: M. Cyril Grignon (LPSC)
        Paper
        Slides
      • 58
        Review of direct searches of dark matters and status of EdelweissII
        I will review the experimental status in the domain of direct searches for Dark Matter and present future prospects.
        Orateur: Prof. Jules Gascon (Universite de Lyon, Universite Lyon 1, CNRS/IN2P3)
        Slides
      • 59
        Solar system dark matter and constraints
        I review constraints on solar system-bound dark matter, and discuss the possibility that dark matter could be gravitationally bound to the earth and other planets. I briefly survey various empirical constraints on such planet-bound dark matter, and discuss effects it could produce if present, including anomalous planetary heating and flyby velocity changes.
        Orateur: Dr Stephen Adler (Institute for Advanced Study)
        Paper
        Slides
      • 60
        Solar system dark matter and simulations
        One method to search for particle dark matter is to hunt down its annihilation products. A goal of the next generation of neutrino telescopes is to find, or better constrain, dark matter by looking for a neutrino flux from dark matter annihilation in the Sun and the Earth. Signals from both sources depend not only on the details of the dark matter model, but on the dynamics of dark matter once it becomes bound to the solar system (captured either by interactions with nuclei in the Sun or gravitational interactions with planets). Using a set of simulations of dark matter orbits in the solar system, I show that the neutrino event rate from annihilations in the Sun may be substantially smaller than currently predicted for very massive WIMPs. I demonstrate that the neutrino event rate from the Earth, while small for dark matter models consistent with experimental constraints assuming a standard dark matter halo, may be significant for the halo dark matter distributions favored by recent cosmological N-body+hydro simulations. In this case, reliably estimating dark matter parameters from the neutrino flux from the Earth will require high-precision estimates of the distribution function of dark matter bound to the solar system.
        Orateur: Dr Annika Peter (California Institute of Technology)
        Paper
        Slides
      • 18:30
        break
      • 61
        Particle Dark Matter in the galactic halo: results from DAMA/LIBRA
        The highly radiopure DAMA/LIBRA set-up (about 250 kg highly radiopure NaI(Tl) sensitive mass) is running at the Gran Sasso National Laboratory of the I.N.F.N..The presented results have been obtained - with an exposure of 0.53 ton x yr - by exploiting the model independent annual modulation signature for Dark Matter particles in the galactic halo. The DAMA/LIBRA data confirm the evidence for the presence of Dark Matter particles in the galactic halo as observed by the former DAMA/NaI experiment. The combined analysis of the data of the two experiments (total exposure 0.82 ton x yr) gives a C.L. at 8.2 sigma. Present works and perspectives will be addressed.
        Orateur: Dr Riccardo Cerulli (INFN-LNGS)
        Paper
        Slides
      • 62
        Dark matter in view of recent experiments
        Recent results from direct and indirect detection of dark matter experiments may be giving early clues to the nature of the dark matter. I review these results and discuss the implications for models of electroweak scale dark matter.
        Orateur: Mlle Kathryn Zurek (FNAL, USA)
        Slides
    • Young Scientists Forum 2
      • 63
        SU(5) and A(4)
        We consider the possibility to take into account the role of the discrete A(4) flavor group into a context of unification obtained through the SU(5) gauge symmetry. Our attention is dedicated to the possibility to preserve the renormalizability of the entire theory avoiding the presence of higher order operators, without forsaking to the usual elegance trough which A(4) can sketch out the correct path of mixing in the leptonic sector, reproducing the tri-bimaximal hypothesis.
        Orateur: Dr Alfredo Urbano (Department of Physics and INFN, University of Salento)
        Slides
      • 64
        SUSY searches in Leptonic Final States with CMS
        Within the mSUGRA model, the observability of the decay of the next to lightest neutralino into leptons has been studied using a full simulation of the CMS detector. The final state signature consists of two opposite sign leptons, several hard jets and missing transverse energy. The expected precision of the measurement of the dileptonic mass edge is reported for 1~fb$^{-1}$ of data, including systematic and statistic uncertainties.
        Orateur: M. Niklas Mohr (RWTH Aachen)
        Paper
        Slides
      • 65
        Higgs in two photons
        Orateur: M. Jean-François MARCHAND (LAPP)
        Slides
      • 66
        SUSY Gauge Singlets and Dualities
        By including gauge singlets in supersymmetric gauge theories, we have been able to construct and test new types of duality which may help in finding dual theories for supersymmetric GUTs.
        Orateur: M. James Barnard (University of Durham)
        Paper
        Slides
      • 67
        TGC Limits and Search for Resonances in WZ Final State
        Studies of the WZ production at the LHC allows testing the standard model of electroweak interactions by measuring triple gauge boson couplings. Any deviation of the strength of these couplings would manifest new physics. We present the status report of the preparation for the WZ cross section and TGC measurement with CMS detector and its potential in search for new physics with WZ final state.
        Orateur: Mlle Ketino Kaadze (Kansas State University)
        Paper
        Slides
      • 68
        Particle production in an early supersymmetric universe
        The mechanism of preheating in supersymmetric models of inflation will be introduced in context of existence of flat directions. Flat directions, a typical feature of supersymmetric models, can acquire large vacuum expectation values (VEVs) during inflation. A recent discussion about the impact of such large VEVs on the process of non-perturbative particle production will be presented, signalizing the role of supergravity corrections.
        Orateur: Mme Anna Kaminska (University of Warsaw, Institute of Theoretical Physics)
        Proceedings
        Slides
  • jeu. 12 mars
    • Dark Matter - Astroparticle Physics
      • 69
        CAST results and Axion Review
        Axions have been invented to accommodate the vanishingly small CP Violation in the strong interactions, probed mainly by the stringent limits on the neutron electric dipole moment. Additionally, their discovery may offer a solution to the so much wanted Cold Dark Matter constituent. CAST, the CERN Axion Solar Telescope, searched for axions with masses up to ~0.02eV and improved the axion to photon coupling beyond the ones derived from astrophysical arguments for the first time, g(aγ)<8.8x10^-11GeV^-1. CAST has recently extended its research potential to higher masses, by introducing in the magnet bore a buffer gas, initially 4He (completed) and currently 3He, and has published the best experimental limit in almost the full mass range up to 0.39eV. The CAST experiment has scanned already masses up to 0.64eV and will continue to reach beyond the HDM axion mass limit of ~1eV. The plans are to extend its searches to the sub-keV range. CAST was the first helioscope to operate in the visible. New generation, extra low noise Micromegas detectors of the microbulk technology offer the opportunity to reach a level of g(aγ)~ (few)x10^-11 GeV^-1. ADMX, the Axion Dark Matter eXperiment, on the other side is searching for relic galactic halo axions and is in the reach of the theoretically (KSVZ and DFSZ) favored “axion line” at the μeV mass scale. The results obtained up to now with a GaAs HFET amplifier are going to be superseded with the use of a SQUID amplifier, the world’s quitest spectral receiver, which boosts the sensitivity down to the detection of one rf photon (axion) per minute. ADMX targets at a definitive axion search in the phase space bounded by the astrophysical constraints and the universe overclosure reasoning.
        Orateur: Dr Theodoros Geralis (NCSR Demokritos)
        Paper
        Slides
      • 70
        High energy gamma rays observations with the Fermi gamma-ray Telescope
        The Fermi Gamma-ray Space Telescope, formerly called GLAST, is a mission to measure the cosmic gamma-ray flux in the energy range 20 MeV to >300 GeV, with supporting measurements for gamma-ray bursts from 8 keV to 30 MeV. In addition to breakthrough capabilities in energy coverage and localization, the very large field of view enables observations of 20% of the sky at any instant, and the entire sky on a timescale of a few hours. With its recent launch on 11 June 2008, Fermi now opens a new and important window on a wide variety of phenomena, including pulsars, black holes and active galactic nuclei, gamma-ray bursts, the origin of cosmic rays and supernova remnants, and searches for hypothetical new phenomena such as supersymmetric dark matter annihilations. This talk will review latest results on many of these items.
        Orateur: Prof. nicola giglietto (dipartimento di fisica università e politecnico bari - infn bari)
        Paper
        Slides
      • 71
        Less-dimensions and the origin of Dark Matter
        The origin and the nature of Dark Matter cannot be addressed in the context of Standard Model. If the topology of the Universe is based on 2 flat +1 compact space dimension, constraints on the number of particles and on their quantum numbers occur from the requirement of gauge invariance in the 3-dimensional subspace. This scenario, called less-dimensions, suggests the GUT group of particle physics to be $SO(10)$ with the breaking pattern $SO(10)\to SU(5)\times U(1),$ where only $SU(5)$ is gauged. Interpreting the remaining $U(1)$ as the source of a discrete symmetry of Nature, the covering $SO(10)$ determines all matter fields either odd or even under the discrete symmetry. The minimal model based on $Z_2$ predicts only two possible Dark Matter candidates at low energy, the inert scalar doublet $H_2$ and the scalar singlet $S.$ We work out Dark Matter phenomenology of that model and analyze PAMELA, ATIC and future FERMI data implications on it. At LHC, the SM Higgs sector is the portal to the Dark Matter world.
        Orateur: Dr Martti Raidal (NICPB)
        Paper
        Slides
      • 72
        Results from the Pierre Auger Observatory
        The Pierre Auger Cosmic Ray Observatory has been designed to investigate the origin and the nature of Ultra High Energy Cosmic Rays using a hybrid detection technique. It consists of a surface array overlooked by air fluorescence telescopes which together provide a powerful instrument for air shower reconstruction. The southern part of the Auger Observatory is taking data smoothly since 2004. A review of recent results is presented.
        Orateur: Dr Lorenzo Perrone (Universita' del Salento and INFN Lecce)
        Paper
        Slides
      • 73
        UHECR Source correlations and the Auger analysis
        The Pierre Auger collaboration announced evidence for a correlation of the arrival directions of ultrahigh energy cosmic rays with active galactic nuclei. I discuss this analysis as well as possible tests with neutrino and gamma observations.
        Orateur: Michael Kachelriess (Department of Physics, NTNU)
        Paper
        Slides
      • 10:15
        break
      • 74
        Status and first results of the ANTARES neutrino telescope
        The ANTARES (Astronomy with a Neutrino Telescope and Abyss enviromental RESearch) Collaboration constructed and deployed the world's largest operational underwater neutrino telescope, optimised for the detection of Cherenkov light produced by neutrino-induced muons. The detector has an effective area of the order of 0.1 square km and it is a first step towards a kilometric scale detector. The detector consists of a three-dimensional array of 885 photomultiplier tubes, arranged in 12 lines anchored at a depth of 2475 m in the Mediterranean Sea, 40 km offshore from Toulon (France). An additional instrumented line is used for environmental monitoring and for acoustic neutrino detection R&D. ANTARES is taking data with its full twelve-line configuration since May 2008 and had been also doing so for more than a year before a five and ten-line setups. The detector performance will be discussed. First results obtained for the study of cosmic ray muons and atmospheric neutrinos will be presented.
        Orateur: Mlle Giada Carminati (University and INFN Bologna)
        Paper
        Slides
      • 75
        Latest Results from the IceCube Neutrino Observatory
        Nearly a century after the discovery of cosmic rays their sources remain a mystery. The study of neutrinos along with other cosmic messengers is vital for ultimately identifying the sources of cosmic rays and understanding the nature of the underlying acceleration mechanisms. Neutrinos are especially important as they propagate nearly unperturbed through the universe and point back to their sources. Neutrino astronomy enters a new era with the IceCube neutrino observatory that will instrument a volume of one gigaton of ice by 2011 and is now almost three quarters complete. Current neutrino flux predictions from potential sources suggest that at volume of this scale is needed to detect neutrinos at statistically significant rates. We will present the latest results in the search for astrophysical neutrinos with IceCube and its predecessor AMANDA, which has been operational for the last eight years. We will further present results on indirect searches for dark matter, studies of atmospheric neutrinos, and cosmic rays performed with this multi-purpose experiment. Future extensions to IceCube and the status of the DeepCore sub-detector, whose construction has already started, will be given together with an outlook of future physics potential.
        Orateur: Dr Carsten Rott (Ohio State University)
        Paper
        Slides
      • 76
        Final Results from the HiRes Experiment/Telescope Array Status
        Final results on the cosmic ray spectrum, composition and anisotropy from the HiRes air-fluorescence experiment will be presented. Results on the ankle and GZK cutoff using both monocular and stereo data, cosmic ray composition using the Xmax method, and searches for correlation of the highest energy cosmic rays with putative sources such as AGN's an BL-Lacs will be given. A description of the new US/Japan/Korea/Russia Telescope Array experiment will be given and its current status and prospects for physics will be presented.
        Orateur: Prof. Pierre Sokolsky (University of Utah)
        Slides
    • Young Scientists Forum 3
      • 77
        Scalar Dark Matter and DAMA
        A light scalar WIMP is studied in view of the recent results of the DAMA collaboration. In a scenario where both the WIMP's annihilation and its elastic scattering on nuclei occur dominantly through Higgs exchange, a one-to-one relation between the WIMP’s relic density and its spin-independent direct detection rate is established. The ratio of the relevant cross sections depends only on the dark matter mass if the range allowed by the DAMA results (m < 10 GeV) is considered. We show that if such a light scalar WIMP possesses a direct detection rate compatible with DAMA, it naturally obtains a relic abundance in agreement with WMAP. Indirect detection both with gammas from the Galactic centre and neutrinos from the Sun opens possibilities to test this light dark matter scenario.
        Orateur: Mlle Sarah Andreas (Institut für Theoretische Physik E, RWTH Aachen University, D-52056 Aachen)
        Paper
        Slides
      • 78
        Direct determination of neutrino mass parameters at future colliders
        We investigate in the framework of type-II see-saw mechanism the relationships between the neutrino parameters and the Higgs triplet. The mass matrix of the neutrinos is directly related to the branching ratios of the doubly charged component of the triplet allowing an insight to the neutrino parameters by measuring the branching ratios to leptons. We derive relevant analytic results to tell the neutrino mass hierarchy and lowest neutrino mass as well as give estimates on the Majorana phases. This study also has implications on the searches that are performed at the colliders.
        Orateur: Dr Mario Kadastik (NICPB)
        Paper
        Slides
      • 79
        Measurement of the relative fraction of the gluon-gluon fusion in top-antitop production process at 1.96 TeV proton-antiproton collisions using CDF
        We present the measurement of the relative fraction of the subprocess where the initial states are gluon-gluon pairs or quark-antiquark pairs in top-antitop production at 1.96 TeV proton-antiproton collisions. We identify and reconstruct the signal using events which include two high-momentum leptons, and we distinguish the two subproceses by utilizing the correlated spin states of top and antitop quarks. The analysis is based on 2.0 fb$^{-1}$ of data collected with the Collider Detector at Fermilab (CDF) at the Fermilab Tevatron between March 2002 and May 2007. We find the fraction of the gluon-gluon fusion subprocess to be Fgg=$0.53^{+0.36}_{-0.38}$. That is in agreement with the next-to-leading order calculations of Fgg=$0.15\pm0.05$.
        Orateur: M. Naoki Kimura (University of Tsukuba)
        Paper
        Slides
      • 80
        Measurement of topquark mass
        Orateur: M. Paul Lujan (Lawrence Berkeley National Laboratory Berkeley - CA USA)
        Paper
        Slides
      • 81
        Is antigravity possible?
        Orateur: M. Michael Bebronne (Université Libre de Bruxelles Brussels Belgium)
        Paper
        Slides
    • Neutrino Physics - Leptogenesis
      • 82
        Electromagnetic Leptogenesis
        After briefly reviewing standard leptogenesis, we describe a new scenario, electromagnetic leptogenesis, that can fully explain the baryon-antibaryon asymmetry of the universe, just as standard leptogenesis can. Electromagnetic leptogenesis is driven by CP violation in the decays of heavy Majorana neutrinos to three-body final states that contain, in addition to the particles in standard leptogenesis, an electroweak gauge boson, which may be a photon, a Z, or a W.
        Orateur: Dr Boris Kayser (Fermilab)
        proceedings
        Slides
      • 83
        Results of Cuoricino and review of neutrinoless double beta searches
        Status of DBD searches will be reviewed with particular emphasis on the experiments being prepared now with the goal of taking data in the next couple of year. Cuoricino, the succesfull demonstrator of the bolometric technique, has been stopped for making place to preparatiom of CUORE. The (almost) final results will be presented.
        Orateur: Prof. Fernando Ferroni (Sapienza Universita di Roma &amp; INFN)
        Paper
        Slides
      • 18:30
        break
      • 84
        Can LHC disprove leptogenesis?
        Orateur: M. gilles vertongen (ULB - Service de Physique Théorique)
        Slides
      • 85
        Higgs dependent leptogenesis
        Orateur: M. Yuji Kajiyama (National Institute of Chemical Physics and Biophysics)
        Paper
        Slides
    • Moriond Discussion
  • ven. 13 mars
    • Neutrino Physics - Dark Matter
      • 86
        Instability in coupled dark sectors
        In my talk, I will present our recent work on Coupled Dark matter-Dark energy model. I will show the results of our analysis of background and first order perturbation evolution equations. In particular, I will clarify the origin of early time non-adiabatic large scales instabilities, and point out a viable class of model in which the interaction in directly proportional to the dark energy density. I will then confront that model to recent cosmological data and show the correlations between the dark coupling and several cosmological parameters.
        Orateur: Mlle Laura Lopez Honorez (Universidad Autonoma de Madrid)
        proceedings (pdf)
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        Slides
      • 87
        MiniBoone (fermilab neutrino oscillations)
        Orateur: Dr Zelimir Djurcic (Columbia University)
        Paper
        Slides
      • 88
        Initial Results from Electron-Neutrino Appearance in MINOS
        MINOS is a long baseline neutrino oscillation experiment designed to make precision measurements of the neutrino mixing parameters associated with the atmospheric neutrino mass splitting. Using a neutrino beam from the Main Injector (NuMI) facility at Fermilab, it compares the neutrino energy spectrum for charged current muon neutrino interactions observed in two large detectors located at Fermilab and in the Soudan mine in northern Minnesota at a distance of 735km. The MINOS Collaboration has recently published the world’s best measurement of the atmospheric mass scale by studying muon neutrino disappearance. It has also studied the possibility of muon neutrinos oscillating into sterile neutrinos. Beyond summarizing these recently published results, I will focus on describing our new results on electron neutrino appearance in MINOS after two years of data-taking.
        Orateur: Dr Mayly Sanchez (Argonne National Laboratory)
        Paper
        Slides
      • 89
        The OPERA experiment
        The OPERA experiment aims at measuring the numu->nutau oscillation through the nutau appearance in an almost pure numu beam produced at CERN SPS, 730 Km far from the detector. The nutau appearance signal is detected through the measurement of the decay daughter particles of the tau lepton produced in CC nutau interaction. Since the short-lived tau particle owns, at the energy of the beam, an average decay length of about 1 mm, a micrometric detection resolution is needed. For this purpose the OPERA detector placed in the hall ”C” of the Gran Sasso National Underground Laboratories, makes use of nuclear emulsions, the highest spatial resolution tracking detector, combined with lead plates in an emulsion cloud chamber structure (ECC). The ECCs are arranged in a compact structure called ”brick” and composed by 57 300-micron tick, emulsion films alternated with 56 1-micron tick, lead layers. The target is made of 150 000 bricks for a total mass of 1.3 ktons. Electronic detectors complete the target section of the apparatus, while muon identification is performed by means of two magnetised spectrometers The detector construction was fully equipped in summer 2008 and data taking started at the end of June 2008. In five years of data taking, the experiment is expected to collect about 10 to 15 nutau interactions while the estimated background is less than ~0.8 events. In this talk, we will review the physics potential of the experiment, the performances of the detector and the first results obtained in the analysis of the 2008 run events.
        Orateur: Natalia Di Marco (L'Aquila University & INFN)
        Paper
        Slides
      • 09:55
        break
      • 90
        Non Standard Neutrino Interactions
        I tackle non standard neutrino interactions (NSIs) from the perspective of effective field theories. A general overview of the theoretical aspects of the subject will be given along with current experimental bounds. Our recent work on the constraints implied by the Standard Model gauge symmetries, along with some examples of possible gauge invariant NSI models, is provided.
        Orateur: M. Daniel Hernández (Universidad Autónoma de Madrid, Theoretical Physics Department)
        Paper
        Slides
        tex source
      • 91
        SciBoone
        Orateur: Dr Hide-Kazu TANAKA (Columbia University)
        Slides
    • Latest news from the Tevatron
      • 92
        Tevatron SM Higgs Combined Result (low and high mass regions)
        Orateurs: Doug Benjamin (Duke University), M. Yuji Enari (LPNHE, Paris, France)
        Slides
    • Neutrino Physics
      • 93
        Neutrino data and implications for theta_13
        Pinning down the unknown neutrino mixing angle theta_13 is one of the most important goals in particle physics in connection with future investigation on CP violation in the leptonic sector. In this context, I shall present the results of an updated global analysis of neutrino oscillation data, focusing on this puzzling parameter. I shall discuss two independent and converging hints of theta_13 > 0. An older one coming from atmospheric neutrino data, and a newer one coming from the combination of solar and long-baseline reactor neutrino data. Their combination provides an intriguing preference for theta_13 > 0 at a non-negligible statistical significance ( 90% C.L.). I will discuss possible refinements of the data analyses, which might sharpen such indications.
        Orateur: Dr Antonio Palazzo (IFIC, CSIC/University of Valencia)
        Paper
        Slides
      • 94
        Search for nucleon decay in Super-Kamiokande
        The standard model has been successful in accounting for many experimental results. However, the standard model has unanswered questions: why there are so many parameters? Various attempts have been made to resolve the shortcomings by unifying the electroweak and the strong interactions in the context of Grand Unified Theory (GUT). One of the generic predictions of GUTs is the instability of nucleons. The experimental observation of nucleon decay would provide a strong evidence of GUTs. In this talk, I will present about nucleon decay search in Super-Kamiokande, a large water cherenkov detector, with total exposure 2,288 days (SK1:1489 days, SK2:799days). As a result, we did not observe statistically significant evidence for the nucleon decay and updated their lifetime limits.
        Orateur: Dr Makoto Miura (Kamioka observatory, ICRR, University of Tokyo)
        Paper
        Slides
      • 95
        To Measure Theta_13: The Daya Bay Reactor Neutrino Experiment
        By determining the disappearance rate of anti-neutrinos emitted from the Daya Bay and Ling Ao nuclear power plants in Southeast China, the Daya Bay Reactor Neutrino Experiment will achieve a 1% sensitivity to sin(2*theta_13). The current best limit, by Chooz, is 17%. Beginning three years of data taking in 2011, Daya Bay will be the most precise of the new generation of experiments intended to determine the magnitude of theta_13 , the smallest, and as yet the only unmeasured, angle in the PMNS mixing matrix. A non-zero value is necessary for CP-violation in the neutrino sector. We present an overview of the technique to be employed and the status of construction.
        Orateur: Philip Rubin (George Mason University)
        Slides
      • 96
        Status report on Double Chooz
        Double Chooz main target is to measure the Theta13 oscillation parameter by comparing the reactor neutrino fluxes in two identical detectors located respectively at 400 m and 1 km away from the 2 Chooz reactor cores. The detector target consists of 10 m3 of Gd-doped liquid scintillator surrounded by a 55 cm-thick g-catcher of non-loaded liquid scintillator. This central part is observed by 390 photomultipliers immersed in a non-scintillating mineral oil buffer of thickness 105 cm. The buffer is surrounded by a 50 cm-thick liquid scintillator muon veto and by a 15 cm passive steel shielding. An extra plastic scintillator muon veto is placed on the top of the detector. The far detector is now under construction, while we are in the last design phase of the near one. The expected sensitivity for the phase 1 (far detector only, 1.5 years of statistics) is sin^2(2 Theta13)>0.06 (90% C.L., Dm^2(atm)=2.5 10^-3 eV^2), while it is sin^2(2 Theta13)>0.03 (90% C.L., Dm^2(atm)=2.5 10^-3 eV^2 ) for the phase 2 (3 years of data taking with the 2 detectors). A brief report on the present status of the detector construction will be presented.
        Orateur: Dr Amanda Porta (CEA Saclay)
        proceeding (figure1)
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        proceeding (my photo)
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        Slides
      • 97
        Reconciling dark matter and neutrino masses in mSUGRA
        We study the minimal SUGRA phenomenology in the case of an alternative seesaw mechanism for generating neutrino masses. Changes in the neutrino sector lead to a modification of the supersymmetric particle spectrum and the sneutrino naturally arises as the lightest supersymmetric particle. The obtained sneutrino has a relic density within the WMAP range and is compatible with present nuclear recoil bounds.
        Orateur: Mme Chiara Arina (Universite Libre de Bruxelles)
        Paper
        Slides
      • 18:30
        break
      • 98
        Collective flavor transitions of supernova neutrinos
        When the neutrino density is very high, as in core-collapse supernovae, neutrino-neutrino interactions are not negligible and can appreciably influence the evolution of flavor. The physics of these phenomena is briefly highlighted, and their effects are shown on observable energy spectra from a future galactic supernova. Detection of such effects could provide a handle on two unknowns: the neutrino mass hierarchy, and the 1-3 mixing angle.
        Orateur: Mme Irene Tamborra (Department of Physics, University of Bari & INFN, Bari)
        Paper
        Slides
      • 99
        Current Kamland Results
        KamLAND is a one-kiloton liquid scintillating detector located in the Kamioka Mine in Kamioka, Japan. KamLAND measurements have shown evidence for neutrino oscillation in reactor anti-neutrinos and indications of geological produced anti-neutrinos. The first phase of KamLAND acquired almost 1500 days of data. An analysis of this full data set with improvements in calibration and the understanding of backgrounds now verify the spectral distortions predicted by neutrino oscillations at greater than 5σ. The details of this analysis will be presented along with the current status and future plans for geo-neutrino and solar neutrino measurements with KamLAND.
        Orateur: Lindley Winslow (Massachusetts Institute of Technology)
        Paper
        Slides
      • 100
        Neutrino dipole moments and solar experiments
        We investigate the resonant spin flavour conversion of solar neutrinos to sterile ones, a mechanism which is added to the well known LMA one. We show that the data from all solar neutrino experiments except Borexino exhibit a clear preference for a sizable magnetic field. We argue that the solar neutrino experiments are capable of tracing the possible modulation of the solar magnetic field. In this way Borexino alone may play an essential role although experimental redundance from other experiments will be most important.
        Orateur: Dr Marco Picariello (Università del salento)
        Paper
        Slides
      • 101
        Results from the Borexino experiment
        Borexino is a low threshold liquid-scintillator detector for solar neutrinos located in the LNGS underground laboratory, Italy. Because of the ultra-high radio purity it is the first experiment able to do a real time analysis of the low energetic solar neutrinos. A detection of the solar ⁷Be neutrinos with a rate of 47+-7 counts/day/100tons was reported (192 days of live time measurement). ⁸B neutrinos were observed with a rate of 0.26+-0.06 counts/day/100tons after 246 live days. All detected neutrino fluxes agree with the SSM predictions in case of the MSW-LMA oscillation solution.
        Orateur: M. Timo Lewke (Borexino/ Technische Universität München)
        Paper
        Slides
  • sam. 14 mars
    • Summaries
      • 102
        Theory Summary
        Orateur: M. Mariano Quiros (IFAE Barcelona Spain)
        Slides
      • 103
        Experimental Summary
        Orateur: M. Abolhassan Jawahery (University of Maryland College Park - MD USA)
        Slides
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