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Rencontres de Moriond EW 2010

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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 XLVth Rencontres de Moriond session devoted to ELECTROWEAK INTERACTIONS AND UNIFIED THEORIES will be held in La Thuile from Saturday March 6th to Saturday March 13th, 2010. 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).

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

agenda
document
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  • dimanche 7 mars
    • 08:30 → 12:00
      The Higgs at TeVatron
      • 08:30
        Higgs production: higher orders and finite top mass 25m
        We review the status of the theory predictions for Higgs cross sections at hadron colliders. The focus is put on gluon fusion, where the latest developments concerning the inclusive cross section and distributions are described. Recent investigations concerning the heavy-top limit are reported on. A brief survey of the major differences between Standard Model and SUSY Higgs production is given.
        Orateur: Prof. Robert Harlander (Bergische Universitaet Wuppertal)
        Slides
      • 09:00
        Low Mass SM Higgs 15m
        Orateur: M. Wade Fisher (Michigan State University, USA)
        Slides
      • 09:20
        High mass SM Higgs 15m
        Orateur: M. Richard St Denis (University of Glasgow)
        Slides
      • 09:40
        The Higgs at the Tevatron: the production rates and their uncertainties 10m
        We update the theoretical predictions for the production cross sections of the Standard Model Higgs boson at the Tevatron, focusing on the two main search channels: the gluon fusion mechanism and the associated production with a gauge boson. We include all relevant g=higher order corrections and then estimate the various uncertainties affecting these predictions: the scale uncertainties which can be viewed as a measure of the unknown higher order corrections, the uncertainties from the parton distribution functions, those due to the electroweak effets and those originating from the errors on some important input parameters such as the strong coupling constant and the heavy quark masses. We show that, in a conservative approach, these uncertainties are rather large.
        Orateur: Dr Abdelhak Djouadi (LPT Orsay/CERN)
        Paper
        Slides
      • 09:55
        break 10m
      • 10:10
        Non-commutative approach :pre-and post-dictions 15m
        Connes' noncommutative geometry offers a beautiful way of unifying Einstein's gravity with a tiny class of Yang-Mills-Higgs models. The standard model of electro-weak and strong forces is in this tiny class if some of its parameters meet certain constraints. The pre- and post-dictions resulting from these constraints will be reviewed. Among these, the most striking prediction is certainly the mass of the Higgs boson at 170 +/- 10 GeV. A compilation of all theoretical predictions of the Higgs mass in the literature is also attempted.
        Orateur: M. Thomas Schucker (Centre de Physique Theorique, Marseille)
        Paper
        Slides
      • 10:30
        Higgs Coupling Determination at the LHC 20m
        After a discovery of the Higgs boson the next question is what are its couplings. At the LHC there should be many observable channels which can be exploited to measure the relevant parameters in the Higgs sector. Using the SFitter framework we map these measurements onto the parameter space of a weak-scale effective theory with free Higgs boson couplings. Our analysis benefits from the parameter determination tools and the error treatment used in new--physics searches, to study individual parameters and their error bars as well as parameter correlations. In this talk we will put a special focus on recent analyses using jet substructure techniques.
        Orateur: Dr Michael Rauch (Univ. Karlsruhe, KIT)
        Paper
        Slides
      • 10:55
        Tevatron Results on BSM Higgs Searches 15m
        We present the latest results of searches for beyond standard model Higgs boson production at the Tevatron collider of Fermilab. Analyses have been carried out on samples of about 1-4 inverse fb of data collected by the CDF and D0 detectors. In particular, Higgs bosons in supersymmetric models and fermiophobic scenario have been investigated, and limits on production cross sections and theory parameters have been established.
        Orateur: Dr Miguel Vidal (CIEMAT)
        Slides
    • 17:00 → 20:30
      The LHC start-up
      • 17:00
        The LHC machine status 25m
        The beam commissioning of the LHC in September 2008 was stopped abruptly after only a few days due to a magnet powering incident. An electric arc developed at the location of a poor soldering, releasing a large amount of energy into the magnets and the cryogenic system. The analysis of the incident and the subsequent repair of the affected arc of the LHC revealed a weakness in the protection of the magnet at the level of the interconnection of the magnets. To prevent similar incidents in the future, the LHC and its magnet protection system were subject to an important upgrade and consolidation program. After 14 months of repair, consolidation and recommissioning, beams were finally circulating again in the LHC end of November 2009, marking the beginning of the beam commissioning that lead to first collisions and acceleration to 1.2 TeV within 2 weeks of the startup. This presentation will discuss the issues leading to the incident of September 2008, the upgrade and consolidation program, and finally detail the beam commissioning of the LHC, including an outlook on the LHC run of 2010/2011.
        Orateur: Dr Jorg Wenninger (CERN)
        Slides
      • 17:30
        Running status and first results from LHCb 25m
        The LHCb experiment is optimised for precision measurements of CP violation and rare decays of B and D hadrons at the Large Hadron Collider (LHC) at CERN.  The experiment has seen its first proton-proton interactions in the 450 GeV per beam run of the LHC in 2009. We report on the status of the experiment and present results obtained with the first data.
        Orateur: Dr Wouter Hulsbergen (Nikhef)
        Slides
      • 18:00
        CMS experiment status & first results 25m
        After nearly two decades of design, construction and commissioning, the CMS detector was operated with colliding LHC proton beams for the first time in November and December 2009. Collision data was recorded at centre-off-mass energies of 0.9 and 2.36 TeV, and analyzed with a fast turn-around time by the CMS collaboration. In this talk I will present a selection of commissioning results and striking first physics resonances observed. Then I will discuss the analysis of the transverse momentum and rapidity distribution of charged hadrons, which led to the first CMS physics publication. The excellent performance of the CMS detector and agreement with predictions from simulation are impressive for a collider detector at startup and show a great potential for discovery physics in the upcoming LHC run.
        Orateur: Dr Martijn Mulders (CERN)
        proceedings
        Slides
        source files
      • 18:30
        break 10m
      • 18:45
        First Results of ATLAS 25m
        The ATLAS Experiment at the CERN Large Hadron Collider will study a broad range of particle physics at the highest available laboratory energies, from measurements of the standard model to searches for new physics beyond the standard model. The status of ATLAS commissioning and the ATLAS physics program will be reported, and physics prospects for the 2010 LHC run will be discussed.
        Orateur: Jean-Francois Arguin (Lawrence Berkeley Laboratory)
        Slides
      • 19:15
        Higgs look-alikes at the LHC 15m
        The discovery of a Higgs particle is possible in a variety of search channels at the LHC. However, the true identity of any putative Higgs boson will, at first, remain ambiguous until one has experimentally excluded other possible assignments of quantum numbers and couplings. We quantify the degree to which one can discriminate a Standard Model Higgs boson from "look-alikes" at, or close to, the moment of discovery at the LHC, focusing on the fully-reconstructible "golden" decay mode to a pair of Z bosons and a four lepton final state.
        Orateur: Christopher Rogan (California Institute of Technology)
        Paper
        Slides
      • 19:35
        Road Map for Discoveries at the Hadron Colliders 25m
        The future discovery potential of the two highest energy hadron colliders, the Tevatron and the LHC, will be discussed for a few selected examples. These include of course the Standard Model Higgs, Supersymmetry, and a few other illustrative possibilities. A speculative guess will be taken for the performance on the short-term for both facilities, as well as for the longer term at the LHC.
        Orateur: Dr Peter Jenni (CERN)
        Slides
  • lundi 8 mars
    • 08:30 → 12:00
      LHC future findings
      • 08:30
        The Next-to-Minimal Supersymmetric Standard Model 20m
        The motivations for the Next-to-Minimal Supersymmetric Standard Model (NMSSM) are reviewed, and possible unconventional signals for Higgs and sparticle production at the LHC are discussed. In the presence of a light pseudoscalar, the SM-like Higgs scalar can decay dominantly into a 4-tau final state. In the fully constrained NMSSM with mSUGRA-like soft SUSY breaking terms, the correct dark matter relic density is obtained for a singlino-like LSP and a stau NLSP, which modifies considerably all sparticle decay chains.
        Orateur: Prof. Ulrich Ellwanger (LPT Orsay)
        Paper
        Slides
      • 08:55
        Experimental signatures of extra dimensions at the LHC 15m
        Models for extra dimensions and some of the most promising ensuing signals for experimental discovery at the LHC are briefly reviewed. The emphasis will be put on the production of Kaluza Klein states from both flat and warped extra-dimensions models.
        Orateur: Dr Marc Besancon (CEA-Saclay/DSM/Irfu/SPP)
        Slides
      • 09:15
        Higgless Review 25m
        Orateur: Prof. John Terning (UC Davis)
        Slides
      • 09:45
        break 15m
      • 10:00
        Simple Z' in the early LHC 15m
        Extra vector bosons are a common feature of many extensions of the Standard Model and represent one of the easiest smoking gun of new physics to look for. I will discuss present bounds from direct and indirect searches on the existence of extra spin-1 particles coupled to the Standard Model fields through renormalizable interactions and the possibility of an early discovery at the LHC.
        Orateur: Dr Giovanni Villadoro (CERN)
        Slides
      • 10:20
        Yukawa-unified SUSY 15m
        The requirement of t-b-tau Yukawa coupling unification is common in simple grand unified models based on the gauge group SO(10), and it also places severe constraints on the expected spectrum of superpartners. For Yukawa-unified models with \mu>0, the spectrum is characterized by three mass scales: (i) first and second generation scalars in the multi-TeV range, (ii) third generation scalars, higgsinos and heavy Higgses in the few-TeV range and (iii) gluinos in the range of a few hundred GeV with chargino masses around 100-160 GeV. In such a scenario, gluino pair production should occur at large rates at the LHC, and perhaps even at the Tevatron, followed by gluino three-body decays into neutralinos or charginos. I will discuss the requirements for Yukawa unification, typical mass spectra, the resulting collider phenomenology, as well as the importance of b-tagging for discovering Yukawa-unified SUSY.
        Orateur: Sabine Kraml (LPSC Grenoble)
        Slides
      • 10:40
        Beyond the Minimal Composite Higgs Model 15m
        Strongly-coupled models of electroweak symmetry breaking have been resurrected in the guise of the Minimal Composite Higgs Model. I review the motivation for this model and describe the LHC phenomenology, which is much like that of the Standard Model. Finally, I show how going beyond the minimal model can lead to dramatically different LHC signatures.
        Orateur: Dr Ben Gripaios (CERN)
        Slides
    • 17:00 → 20:30
      Flavour Physics
      • 17:00
        CKM sides 15m
        Orateur: Dr Phillip Urquijo
        Slides
      • 17:20
        Status of CKM Angle Measurements, a report from BaBar and BELLE. 15m
        I will review the latest developments in determining the CP-violating phases of the CKM matrix elements from measurements by the BaBar and BELLE experiments at the high-luminosity B factories (PEP-II and KEKB). The emphasis will be on the angle gamma/phi3 of the Unitarity Triangle, which is the relative phase arg((-Vud Vub*)/(Vcd Vcb*)), or the CP-violating phase of the b->u transition in the commonly used Wolfenstein convention.
        Orateur: Prof. Owen Long (University of California Riverside)
        Paper
        Slides
      • 17:40
        $D^0 - \bar{D}^0$ mixing and charm $CP$ violation. 15m
        In this talk, experimental results of charm mixing and CP violation searches will be presented. Analyses of $D^0 \rightarrow K^+ \pi^-$, $D^0 \rightarrow K^+ K^-, \pi^+ \pi^-$, $D^0 \rightarrow K^{(\star) -} \ell^+ \nu$, $D^0 \rightarrow K^+ \pi^- \pi^0$, $D^0 \rightarrow \pi^+ \pi^- \pi^0$, $D^0 \rightarrow K^+ K^- \pi^0$, and $D^0 \rightarrow K_s \pi^+ \pi^- / K^+ K^-$ have been carried on within the BaBar and Belle collaborations. Though evidence of CP violation in the decay, mixing or interference has never been found, compelling evidence of mixing in the $D^0$ sector has been found in $D^0 \rightarrow K^+ \pi^-$ and $D^0 \rightarrow K^+ K^-, \pi^+ \pi^-$ events. The talk will dedicate special attention to time dependent analyses of three body $D$ meson decays, which provide the oportunity to measure the mixing parameters $x$ and $y$ directly.
        Orateur: Jordi Garra Ticó (Universitat de Barcelona)
        Slides
      • 18:00
        B decays with tau lepton in the final state at Belle 15m
        We present recent measurements of B -> tau nu and B->D(*) tau nu decays based on a data sample containing 657 millions of B-B-bar pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. Experimental aspects and theoretical implications are briefly discussed.
        Orateur: maria rozanska (H. Niewodniczanski Institute of Nuclear Physics)
        Slides
      • 18:20
        break 15m
      • 18:40
        Lattice QCD and Flavour Physics 20m
        I make a review of current lattice results and their impact on Flavour Phyics in the Standard Model and Beyond.
        Orateur: Dr Federico Mescia (Universitat de Barcelona)
        Slides
      • 19:05
        Strange Beauty and other Beasts from Υ(5S) at Belle 15m
        The B-factories have successfully exploited the unique advantages of the Upsilon(4S) resonance to study many aspects of the B_d and B_u mesons. The Upsilon(10860) resonance, also known as Upsilon(5S), which is above mass threshold for the B_s and shares many of the same advantages, has been relatively unexplored. The Belle experiment has collected more than 120 fb-1 at the Upsilon(10860) and 7.9 fb-1 at higher energies, corresponding to more than 10 million Bs events. Recent results based on ~20% of these data will be presented, and prospects for future possiblities will be discussed.
        Orateur: Prof. Kay Kinoshita (University of Cincinnati)
        Slides
      • 19:25
        Mixing and Delta Gamma_s (Tevatron) 15m
        Orateur: Dr Mark Williams
        Slides
      • 19:45
        Recent Results from CLEO-c 15m
        Results from the CLEO-c experiment have a significant impact on our understanding of and ability to control hadronic physics effects in the extraction of CKM matrix parameters, both via the validation of theoretical predictions and direct measurements of relevant phases. I will discuss its latest results on leptonic, semileptonic, and hadronic decays that are important for electroweak physics.
        Orateur: Dr Peter Onyisi (University of Chicago)
        Proceedings (PDF)
        Proceedings (source)
        Slides
  • mardi 9 mars
    • 08:30 → 12:00
      Standard Model and beyond
      • 08:30
        Wmass,W and Z properties(Tevatron) 15m
        Orateur: Dr Marco Rescigno
        Slides
      • 08:50
        Top Quark Production at the Tevatron 15m
        Discovered in 1995 by CDF and D0, the top quark is the heaviest known elementary particle until today. Due to its short lifetime and its high mass, the top quark is an interesting particle to study. In this talk we will present the latest measurements related to top quark production, such as the cross section of ttbar and single top. Some searches for new particles with signatures similar to those of the top quark will also be presented.
        Orateur: Dr Alison Lister (Université de Genève)
        Paper
        Proceedings Source
        Slides
      • 09:10
        Top Quark Properties at the Tevatron 15m
        This talk will show several highlights of top quark properties measurements, like for example the top quark mass, top quark width and ttbar spin correlations. Furthermore, a selection of beyond the SM top quark searches, in context with top properties measurements, will be presented.
        Orateur: Dr Yvonne Peters (University of Manchester)
        Latex file for proceedings
        Paper
        picture
        Slides
      • 09:30
        Measuring the running top-quark mass 15m
        We present the first direct determination of the running top-quark mass based on the total cross section of top-quark pair-production as measured at the Tevatron. Our theory prediction for the cross section includes various next-to-next-to-leading order QCD contributions, in particular logarithmically enhanced terms near threshold, the Coulomb corrections at two loops and all explicitly scale dependent terms at NNLO accuracy. For Tevatron and LHC we study the dependence of the cross section on the renormalization and and factorization scale, on the parton luminosity and on the top-quark mass using both the conventional pole mass definition as well as the running mass in the MS scheme. We extract for the top-quark an MS mass of m(μ = m) = 160.0+3.3−3.2GeV, which corresponds to a pole mass of mt = 168.9+3.5−3.4GeV. We observe that extracted value for the running mass is remarkable stable with respect to the perturbative order.
        Orateur: Prof. Peter Uwer (Humboldt-Universität zu Berlin)
        Slides
      • 09:50
        break 15m
      • 10:10
        Diboson Production at the Tevatron 15m
        We present the latest results on the production of WW, WZ, Wgamma, Zgamma and ZZ events at the Fermilab Tevatron Collider. The results are based on the analyses of ~1 -- 5/fb of data collected in ppbar collisions at sqrt{s}=1.96~TeV by CDF and DO experiments during the Tevatron Run II. Analyses of the diboson production processes provide crucial test of the Standard Model, directly probing its predictions on the Trilinear Gauge Couplings.
        Orateur: Dr Ia Iashvili (SUNY Buffalo)
        Slides
      • 10:30
        Tevatron Searches for New Physics with Leptons 15m
        The Fermilab Tevatron Collider experiments have now each collected almost 7 fb-1 of data, and are steadily increasing their sensitivity to physics beyond the standard model. In this talk, recent results from searches in final states containing leptons will be described.
        Orateur: Dr Jonathan Hays
        Paper
        Slides
      • 10:50
        Isolated leptons at HERA 10m
        Orateur: Dr Amita Raval
        Slides
      • 11:05
        EW Measurements at High Q2 at HERA
        Over 15 years of data taking at the HERA ep collider about 1 fb-1 was gathered in the H1 and ZEUS experiments for neutral and charge current deep inelastic processes at the center-of-mass energy of 320 GeV. This allows to provide the precise determination of the parton distribution functions in the proton and study of the EW effects using data from high Q2, where the contribution from W, Z bosons is significant.
        Orateur: M. Stanislav Shushkevich (MPIM)
        Slides
    • 17:00 → 19:30
      Standard Model and beyond
      • 17:00
        SOFT WALLS: AN ALTERNATIVE SOLUTION TO THE ELECTROWEAK HIERARCHY 15m
        Soft walls are alternative solutions (to RS ones) to the hierarchy problem in warped extra dimensions. Soft walls are generic models where extra scalars are propagating in the bulk and back react on the metric. They replace IR brane by a curvature singularity. Soft walls can provide very peculiar and unambiguous phenomenological features since KK modes (separated from the zero mode by a mass gap) can be very close to each other and a few of them be produced at LHC. In the continuous limit they describe unparticles. Electroweak breaking and bounds from electroweak constraints will be presented.
        Orateur: Prof. Mariano Quiros (ICREA)
        Slides
      • 17:20
        Cornering the Higgs at LEP 10m
        Orateur: Dr Kyle Cranmer
        Slides
      • 17:35
        Tevatron searches: New Physics with photons and jets 15m
        Orateur: Dr Ben Brau
        Paper
        Slides
      • 17:55
        Gauge mediation : mass patterns review 15m
        We give a general formulation of semi-direct gauge mediation of supersymmetry breaking where the messengers interact with the hidden sector only through a weakly gauged group. We discuss the resulting MSSM gaugino masses and sfermion squared masses. We comment on how such mechanism can successfully be combined with other mediation schemes.
        Orateur: Dr Alberto Mariotti (VUB)
        Slides
      • 18:15
        break 15m
      • 18:30
        Non-standard SUSY spectra in gauge mediation 15m
        The experimental signatures of supersymmetric extensions of the Standard Model, such as the Minimal Supersymmetric Standard Model (MSSM), depend on the actual spectrum of superpartners, which in turn is determined by the mechanism responsible for the breaking of supersymmetry and for its mediation to the MSSM. An attractive possibility, known as gauge mediation, is that supersymmetry breaking be transmitted by gauge interactions through loops of messenger fields. In this talk, I will discuss the possibility that the messenger fields couple to the Higgs multiplets of an underlying Grand Unified Theory. This leads to rather unusual supersymmetric spectra, with distinctive collider signatures and implications for cosmology.
        Orateur: Dr Stéphane Lavignac (IPhT Saclay)
        Proceedings file
        Proceedings source
        Slides
      • 18:50
        Higgs in MSSM with dim-5 and 6 operators 20m
        The presence of all R-parity conserving dimension-five and -six effective operators in the MSSM is analyzed in a model independent way, with emphasis on their implications to the Higgs sector and to LHC supersymmetry searches.
        Orateur: M. Igniatios Antoniadis (Ecole Polytechnique Centre de Physique Theorique (CPHT))
        Paper
        Slides
    • 19:40 → 20:30
      Young Scientist Forum 1
      • 19:40
        The W mass at D0 5m
        Orateur: Dr sahal Yacoob
        Slides
      • 19:47
        egamma results with early data on behalf of the ATLAS collaboration 5m
        First study of electron and photon candidates in the 900 GeV collision data collected by ATLAS at the end of 2009. Good agreement is demostrated between observation and expectation for low-pt electron and photon reconstruction and identification.
        Orateur: Henso ABREU (LAL-Orsay)
        Slides
      • 19:54
        Extraction of the Phi(1020)->KK signal with early CMS data 5m
        During a few days in December 2009 the Large Hadron Collider produced about 400 thousand proton-proton collisions at 900 GeV in the center of the CMS detector. This data have been very useful for a first check of the performance of the various detector elements, especially the silicon tracker. A signal of 1318+-95 Phi(1020)->K+K- decays was extracted from that early data using information on the energy loss of charged kaons in the silicon sensors of the CMS tracker.
        Orateur: Dr Luca Perrozzi (Padova & INFN)
        Slides
      • 20:01
        Luminosity measurement at LHCb 5m
        The high resolution of the LHCb vertex detector makes it possible to perform precise measurements of vertex positions of beam-gas and beam-beam interactions. With these measurements beam parameters such as width and position can be measured. A novel method for determining the absolute luminosity at the LHC using the directly measured beam parameters will be presented. The data taken in 2009 will be used to illustrate the procedure.
        Orateur: M. Plamen Hopchev (LAPP)
        latex_source_package
        Paper
        Slides
      • 20:15
        Tree Level Gauge Mediation 5m
        We propose a new scheme in which supersymmetry breaking is communicated to the MSSM sfermions by tree level gauge interactions. The constraints from the supertrace formula are avoided because the (positive) contribution to the supertrace of MSSM fields is automatically compensated by a (negative) contribution from heavy fields. Sfermion masses are flavour universal, thus solving the supersymmetric flavour problem. The mass relations of the sfermions are different with respect to other supersymmentry breaking and flavour universal scenario scenario like mSugra or the usual one loop gauge mediation, thus making this framework testable at the LHC.
        Orateur: M. Marco Nardecchia (SISSA)
        Slides
      • 20:20
        Search for the Higgs boson production in dilepton plus missing energy final states at DZero 5m
        We present a search for the Standard Model Higgs boson produced in p-pbar collsions via the $H\to WW^{(*)}\to l\nul\nu$ process at a center-of-mass energy of $\sqrt{s}=1.96$ TeV, using 5.4~fb$^{-1}$ of data collected with the D0 detector at the Fermilab Tevatron collider. We consider a final state where the Higgs boson decays into a pair of $W$ bosons which in turn decay leptonically. This channel, with its clear signature of two leptons and missing energy, provides the greatest sensitivity to the Higgs boson at the Tevatron in the high mass region. With the current dataset no excess above the Standard Model predictions is observed, and limits on the Higgs production cross-section are set for $m_{H}$ in the range $115-200$ GeV.
        Orateur: M. Davide Gerbaudo (Princeton University)
        Slides
  • mercredi 10 mars
    • 08:30 → 12:00
      Rare processes as probes of beyond the SM
      • 08:30
        Searches for New Physics in Upsilon Decays 15m
        Orateur: Dr Steven Robertson (IPP/McGill)
        Slides
      • 08:50
        Lepton universality and searches for lepton flavor violation 15m
        We present some recent results obtained by the \babar\ experiment on the search for new physics in leptonic and lepton flavor violating (LVF) decays, exploiting the complete datasets collected at the $\Upsilon(4S)$, $\Upsilon(3S)$ and $\Upsilon(2S)$ energies. We present new limits on the ratio $\Gamma(\Upsilon(1S)\to\tau^+\tau^-)/\Gamma(\Upsilon(1S)\to\mu^+\mu^-)$, on LFV decays of the $\Upsilon(3S)$ and $\Upsilon(2S)$, and on $\tau$ decays to three charged leptons or $\tau\to e/\mu \gamma$.
        Orateur: Mlle Elisa Guido (University and INFN Genova)
        Paper
        Slides
      • 09:10
        Lepton universality NA62 15m
        Orateur: Dr Evgeny Goudzofski
        Paper
        Slides
      • 09:30
        Kaon physics in the NA62 era 15m
        With about 10^13 charged kaon decays, the NA62 experiment at CERN will open a new frontier. In this talk, its physics reach will be briefly reviewed, as well as its relevance in the LHC era. We will start with the main goal of NA62, the rare decay K+ ---> pi+ nu anti-nu, and show how essential it is to investigate the flavor structures of any New Physics theory found at the LHC. Then, the tremendous luminosity opens many new opportunities to either probe for new physics or to learn about QCD at low-energy. This will be illustrated by several examples of rare, radiative, (semi)leptonic, and hadronic decays. Finally, we will argue that a future extension of NA62 to a neutral beam is crucial, especially if some new physics is found at the LHC.
        Orateur: Dr Christopher Smith (Karlsruhe Institute of Technology)
        Paper
        Slides
      • 09:50
        First results from the MEG experiment for the search of the Lepton Flavour Violating decay mu+ -> e+ gamma 15m
        We are going to present the first results from the MEG experiment for the search of the Lepton Flavour Violating decay mu+ -> e+ gamma. LFV decays are forbidden in the SM and highly suppressed in any minimal SM extension with tiny neutrino masses. On the other hand, several SUSY, GUT and ED models beyond the SM predict the mu+ -> e+ gamma rate at a level experimentally accessible. Hence, the MEG experiment will be able either to provide an incontrovertible evidence of physics beyond the SM or to significantly constrain the parameter space of SM extensions.
        Orateur: Mme Elisabetta Baracchini (University of California Irvine)
        Slides
      • 10:10
        break 15m
      • 10:25
        CP phases in leptonic flavour violation 15m
        We study a CP and T violating triple (spin) correlation in the muon to electron conversion in nuclei in the context of the seesaw mechanism. After concluding that the results are negative for all three seesaw types, we turn to the left-right symmetric theories as the original source of seesaw. We find that in general this correlation is of order one which offers a hope of observing CP violation in lepton flavor violating processes for a L-R scale below around 10-30 TeV. We discuss the conditions that could render to (unlikely) conspiracies as to suppress the CP violating effects.
        Orateur: Dr Miha Nemevsek (University of Hamburg)
        Slides
      • 10:45
        The Current Status of g-2 15m
        Recently, important updates were made for the hadronic contribution to the theoretical prediction of g-2. The isospin-breaking-corrections, needed in the comparison of the two pion spectral functions from tau decays and e+e- annihilations, were improved using new experimental and theoretical input. The recently published BABAR data were included in the global average of e+e- spectral functions. These data, as well as the ones from tau decays, were combined using newly developed software, featuring improved data interpolation and averaging, more accurate error propagation and systematic validation. The discrepancy between the e+e- and the tau-based result is reduced from previously 2.4 to 1.5 sigma. The full Standard Model prediction of g-2, obtained using e+e- data, differs from the experimental value by 3.2 standard deviations.
        Orateur: M. Bogdan MALAESCU (LAL, Orsay, FRANCE)
        Paper
        Slides
      • 11:05
        NMSSM Low Energy Effects 15m
        The Next-to-Minimal Supersymmetric Standard Model is a well motivated singlet extension of the MSSM, liable, e.g., to solve the "mu-problem". A remarkable feature of this NMSSM lies in the possibility of very light CP-odd Higgs states (below the B-Bbar threshold). While most of the aspects of the phenomenology of the NMSSM at low energy remain similar to the effects expected in the MSSM, such light particles may lead to significant new contributions. In the corresponding talk, we will thus review a few aspects of the low energy phenomenology of the NMSSM, focussing on rare B decays, muon (g-2) and bottomonium spectroscopy and decays. Special emphasis shall be given to the NMSSM specific effects, associated with a light CP-odd Higgs.
        Orateur: Dr Florian DOMINGO (Institut fuer Theoretische Teilchenphysik - Karlsruhe)
        Proceeding
        Proceeding source
        Slides
    • 17:00 → 19:00
      Rare processes, Neutrinos
      • 17:00
        Toward a sub-ppm measurement of $G_F$ 15m
        The weak coupling constant, $G_F,$ is determined most precisely from the mean life of the positive muon, $\tau_\mu$. Advances in theory have reduced the theoretical uncertainty on $G_F$ as calculated from $\tau_\mu$ to a few tenths of a ppm. The remaining uncertainty on $G_F$ is entirely experimental, and is dominated by the uncertainty on $\tau_\mu$. The MuLan experiment is designed to measure the muon lifetime to a precision of 1 ppm, a twenty-fold improvement over the previous generation of experiments. In 2007, we reported an intermediate result, $\tau_\mu=2.197013(24)$ $\mathrm{\mu s}$ (11 ppm), which is in excellent agreement with the previous world average. This mean life was measured using a pulsed surface muon beam stopped in a ferromagnetic target, surrounded by a symmetric scintillator detector array. Since this intermediate measurement, the detector was instrumented with waveform digitizers, the muon beam rate and beam extinction were increased, and two data sets were acquired on different targets, each containing over $10^{12}$ muon decays. These data will lead to a new determination of $G_F$ to better than a part per million.
        Orateur: David Webber (University of Illinois at Urbana-Champaign)
        Slides
      • 17:20
        Final results for muon decay parameters from TWIST 15m
        Muon decay offers an opportunity to test the Standard Model of particle physics in a purely leptonic low-energy situation where more ambiguous strong interaction processes are essentially absent. The TRIUMF Weak Interaction Symmetry Test (TWIST) was designed specifically to improve by an order of magnitude the precision of the decay parameters rho, delta, and Pmu*xi derived from energy and angle distributions of positrons from polarized positive muon decay. It tests the V-A structure of the decay by comparing the parameters to those predicted by the Standard Model in an analysis permitting more general Lorentz-invariant local terms. Since the completion of data taking in 2007, a careful analysis has been carried out with the aim of improving upon earlier intermediate results, by reducing systematic uncertainties, estimating residual biases, and evaluating consistency checks. The total uncertainties for rho, delta, and Pmu*xi, representing improvements of 9, 12, and 7 respectively when compared to pre-TWIST experiments, are dominated by systematics. The analysis was blind with respect to the central values of the parameters. The hidden parameters were recently revealed and final results are now available. The talk will describe muon decay and the way in which we measure it. The experimental apparatus and analysis procedures will be reviewed, with particular attention to the reduction of leading systematic uncertainties. The final results and their uncertainties will be presented along with implications and limitations for physics beyond the Standard Model. Interpretations in terms of left-right-symmetric extensions are shown to be complementary to those from high-energy experiments.
        Orateur: Dr Glen Marshall (TRIUMF)
        Paper
        Slides
      • 17:40
        EW rare decays (Belle) 15m
        Orateur: Dr Alex Bondar
        Slides
      • 18:00
        FCNC, lifetimes, rare decays (Tevatron) 15m
        Orateur: Dr Sneha Malde
        Paper
        Slides
      • 18:20
        break 15m
      • 18:35
        Search for neutrinoless double beta decay: from NEMO-3 to SuperNEMO 20m
        The NEMO-3 detector aimed to study double beta (bb) decays in general and to search for neutrinoless mode (0nbb) particularly provides unique tracko-calorimetric technique able to register full bb-signature. This information is crucial for investigation of 0nbb-mechanism once 0nbb-decay will be discovered. Continuing to take data since February 2003 at the moment the NEMO-3 is the only working bb-detector reached sub-1eV sensitivity to effective Majorana neutrino mass, which is at level of world best 0nbb-results. Latest 0nbb-results will be presented at the conference as well as 2nbb-results. The goal of SuperNEMO is to reach ~50 meV sensitivity to effective Majorana neutrino mass with 100 kg of Se-82 isotope extrapolating and improving successful NEMO-3 technique. This sensitivity scale is the main challenge for all leading next generation 0nbb-projects. SuperNEMO R&D program has been started at 2006 and currently collaboration is preparing to build first SuperNEMO module which must demonstrate the workability of the experimental technique. Latest R&D progress in calorimetry, tracking, low background measurements, software will be discussed.
        Orateur: Dr YURI SHITOV (Imperial College London)
        Slides
    • 19:10 → 20:30
      Young Scientist Forum 2
      • 19:10
        Tracking performance in V0 reconstruction with first data at LHCb 5m
        The reconstruction of $K^0_S$ and $\Lambda$ resonances is a crucial test of the performance of the LHCb tracking detectors, the reconstruction software and the status of the alignment of the LHCb spectrometer. We will present first results towards a measurement of the V0 production rate based on data taken at a center of mass energy of 900GeV in December 2009 with the LHCb experiment.
        Orateur: M. Sascha Stahl (Physikalisches Institut Heidelberg)
        Slides
      • 19:17
        Measuring the J/Psi Production Cross Section with CMS 5m
        The workflow of the measurement of the Jpsi cross section in the di-muon decay channel with CMS at the LHC will be given, with a particular emphasis in the description of the determination of the muon detection efficiency and acceptance.
        Orateur: Dr Luca Martini (Pisa)
        Paper
        Slides
        sources
      • 19:25
        Strategy for an early observation of the $ZZ^(*)$ di-boson production in four-lepton final states 5m
        The study of the production of two Z bosons at the TeV scale constitutes an important test of the Standard Model and it is a necessary step towards the discovery of new physics and new particles like the Higgs boson. We investigate the CMS potential for the observation and study of pp-> ZZ->4l reaction at LHC center of mass energies, using fully simulated signal and background samples. It is shown that these processes are accessible with early CMS data. Data driven methods are developed for the background determination.
        Orateur: M. Daniele Trocino (Università di Torino, INFN Torino)
        Paper
        Slides
        Source files
      • 19:32
        Optimization of the electron reconstruction and identification in ATLAS experiment and implications on the Higgs to 4 electrons analysis. 5m
        The search for the Higgs boson will be one of the main issues in the next year in the ATLAS detector. The H->ZZ*->4e channel in particular, is a very promizing channel to discover the Higgs for masses above 130 GeV with a clean electron signal. The electron reconstruction and identification plays here a key role. Since the CSC note published 2 years ago a lot of work as been done in order to futher optimize both reconstruction and identification efficiencies of , while maintaining a high rejection power against backgrounds. Those optimizations induce an increase of our discovery potential in the H->ZZ* channel.
        Orateur: Mme Fany Dudziak (Laboratoire de l'Accélérateur Linéaire)
        Paper
        Slides
      • 19:39
        The ATLAS discovery reach for SUSY models with early data 5m
        The search for physics beyond the Standard Model (BSM) is one of the most important goals for the general purpose detector ATLAS at the Large Hadron Collider at CERN. Already with early LHC data, the ATLAS experiment should be sensitive to discover physics beyond the Standard Model. In this talk I summarize the prospects of the ATLAS experiment to find experimental evidence for Supersymmetry (SUSY) in channels with jets, leptons and missing transverse energy for an integrated luminosity of L = 200pb-1 at a centre-of-mass energy of 10 TeV.
        Orateur: Mlle Janet Dietrich (University of Freiburg)
        Slides
      • 19:46
        New Physics bounds from CKM-unitarity 5m
        Using a effective Lagrangian approach we show how the bounds to the new operators that come from high energy data can be improved with the inclusion of the experimental information of the CKM-universality, a low energy observable. We assume U(3)^5 invariance, although some remarks will be done about the general case, with non-U(3)^5 invariant operators.
        Orateur: Martin Gonzalez-Alonso (Universidad de Valencia)
        Minutes
        Proceedings (source files)
        Slides
      • 19:53
        Muon identification in the LHCb experiment 5m
        Several key measurements of the LHCb experiment rely on the efficient identification of muons. Examples of these are the search for the rare decay Bs->mumu and the study of the angular distributions of the decay B0>K*mumu. A summary of the LHCb muon identification strategy is presented, covering both the baseline method, and also alternative approaches presently under development. First results on muon identification with 2009 data and their comparison to Monte Carlo simulations are also shown.
        Orateur: M. Xabier Cid Vidal (USC - IGFAE)
        Paper
        Slides
      • 20:00
        Sensitivity of T2KK to NSI in propagation 5m
        We study sensitivity to the non-standard interaction in neutrino propagation of the T2KK neutrino long baseline experiment, assuming only the non-zero electron and tau neutrino components epsilon_{ee}, epsilon_{e tau}, epsilon_{tau tau} of the non-standard matter effect, and taking into account the atmospheric neutrino constraint on these parameters. We found that T2KK can restrict the parameters |epsilon_{ee}| < 1, |epsilon_{e tau}|< 0.15. We also discuss how T2KK can distinguish the standard and non-standard CP phases in case these parameters are larger than these bounds.
        Orateur: Mlle Haruna Oki (Tokyo Metropolitan University)
        Slides
      • 20:07
        The fine tuning guide for SUSY searches 5m
        Low energy supersymmetry can be theoretically motivated as a solution to the hierarchy problem of the Standard Model if the superpartner states are not too heavy. The non-observation of SUSY and precision tests then introduces some tension in the attempt for naturalness. I will present a study of the amount of fine tuning at 2-loop order in the constrained MSSM and discuss which regions of the parameter space are preferred on naturalness grounds. The implications for the most promising collider and dark matter search strategies for observing SUSY will also be considered.
        Orateur: M. Sebastian Cassel Cassel (Oxford University)
        Slides
      • 20:15
        MSSM Forcast for the LHC 5m
        Orateur: Dr Maria Cabrera
        proceeding (LaTeX)
        proceeding (.ps)
        Slides
  • jeudi 11 mars
    • 08:30 → 12:05
      Neutrinos, Dark Matter
      • 08:30
        Dark matter detection in the BMSSM 20m
        The addition of non-renormalizable terms involving the Higgs fields to the MSSM (BMSSM) ameliorates the little hierarchy problem of the MSSM. For neutralino dark matter, new regions for which the relic abundance of the LSP is consistent with WMAP (as the bulk region and the stop coannihilation region) are now permitted. In this framework, we analyze in detail the direct dark matter detection prospects in a Xenon-like experiment. On the other hand, we study the capability of detecting gamma-rays, antiprotons and positrons produced in the annihilation of neutralino LSPs in the Fermi and oncoming AMS-02 experiments.
        Orateur: Dr Nicolás BERNAL (CFTP - IST)
        Paper
        Slides
      • 08:55
        Recent Results from CDMS 15m
        I will present the search for WIMP interactions with the final data collected by the CDMSII experiment. CDMS has pioneered the use of ionization and athermal phonon signals to discriminate between candidate (nuclear recoil) and background (electron recoil) events in Ge crystals cooled to ~ 50 mK. Our timing, yield, and position information allows us to maximize our discovery potential by adjusting the expected background in the signal region to less than one event. The analyzed dataset consists of ~600 kg-days of raw exposure. I will report on the blind analysis of this dataset, the significance of the results and the implications for future dark matter direct detection experiments.
        Orateur: Dr Lauren Hsu (Fermi National Accelerator Laboratory)
        Paper
        Slides
        tarball of proceedings
      • 09:15
        First EDELWEISS-II results 15m
        The EDELWEISS-II collaboration has performed a direct search for WIMP dark matter with an array of ten 400 g heat-and-ionization cryogenic detectors equipped with interleaved electrodes for the rejection of near-surface events. Six months of continuous operation at the Laboratoire Souterrain de Modane have been achieved. The observation of one nuclear recoil candidate above 20 keV in an effective exposure of 144 kgd is interpreted in terms of limits on the cross-section of spin-independent interactions of WIMPs and nucleons. A cross-section of 1.0x10^-7 pb is excluded at 90%CL for a WIMP mass of 80 GeV/c2. This result demonstrates for the first time the very high background rejection capabilities of these simple and robust detectors in an actual WIMP search experiment. The future prospects for this experiment are also discussed.
        Orateur: Dr Silvia Scorza (Institut de Physique Nucléaire de Lyon (IPNL))
        Slides
      • 09:35
        Determining WIMP parameters from direct detection experiments 15m
        I will discuss the information on the WIMP parameters (mass and cross-section) which can be extracted from current and upcoming direct detection experiments. In particular I will discuss the effects of astrophysical uncertainties (in the local WIMP density and velocity distribution).
        Orateur: Dr Anne Green (University of Nottingham)
        Paper
        Slides
      • 09:55
        SO(10) Dark Matter and Electroweak Symmetry Breaking 15m
        We consider a minimal model of GUT scalar dark matter with one complex scalar singlet and one 'inert' doublet from the 16 of non-SUSY SO(10). Both dark matter abundance and direct detection cross section are dominated by the new soft coupling between the SM Higgs boson, the singlet and the doublet. The soft coupling can be large without violating perturbativity below the GUT scale. The electroweak symmetry is broken radiatively by dark matter couplings to the Higgs boson. Demanding perturbativity and vacuum stability up to the GUT scale predicts the mass range on order of 0.1…1 TeV for thermal relic dark matter. The spin-independent direct detection cross section is predicted to be just at the present experimental sensitivity and can explain the observed CDMS II recoil events. The distinctive feature of LHC phenomenology will be a displaced dilepton vertex.
        Orateur: Dr Kristjan Kannike (NICPB, Estonia)
        Paper
        Slides
      • 10:15
        break 10m
      • 10:30
        Status of the T2K experiment 15m
        T2K is a long baseline neutrino oscillation experiment which aims to precisely measure the oscillation parameters associated with \nu_{\mu} disappearance and to search for \nu_{e} appearance. It utilizes the J-PARC proton synchrotron to produce the muon neutrino beam, which is measured by the near detectors and the Super-Kamiokande detector. The T2K neutrino beamline and the near detectors were commissioned with beam. The results including the performance of the beam monitors and neutrino events measured by the near detectors are presented.
        Orateur: M. Kodai Matsuoka (Kyoto University)
        Proceedings
        Slides
      • 10:50
        Recent results from MiniBooNE: update on low-energy excess and cross-section measurements 15m
        MiniBooNE is a neutrino oscillation experiment located in Fermilab, USA. Its primary goal was to verify or reject neutrino oscillations as the source of the excess of events observed by the LSND experiment at LANL From its start of operation in 2002, MiniBooNE has reported many interesting scientific results including low-energy excess in neutrino mode and various cross-section measurements. My talk will be concentrated on our recent studies aimed at better understanding of low-energy excess. I will describe new neutrino interaction channels proposed to explain the observed excess of events. Anti-neutrino mode results with updated statistics will be presented together with recent cross-sections measured in MiniBooNE detector.
        Orateur: Dr Bari Osmanov (University of Florida)
        Slides
      • 11:10
        SciBooNE and other neutrino cross section measurements 15m
        Accurate knowledge of neutrino cross section around 1 GeV energy is important for long baseline neutrino oscillation experiments. In this talk, latest results from SciBooNE, a neutrino cross section experiment at Fermilab, will be presented together with some of related results from other experiments.
        Orateur: Prof. Masashi Yokoyama (University of Tokyo)
        Paper
        Slides
        src
    • 17:00 → 18:00
      Neutrinos
      • 17:00
        Measuring Terrestrial and Solar Neutrinos with KamLAND 15m
        KamLAND, a large underground neutrino detector located in Japan, has measured neutrino properties by studying electron anti-neutrinos produced in the decay of fission products in nearby nuclear power reactors. KamLAND's 180km average distance to the reactors makes it well-suited to investigate the oscillation parameters in the (1,2) sector. Several shorter baseline reactor neutrino experiments currently under construction will search for the as-yet unknown theta13 neutrino parameter. This talk will review the KamLAND neutrino parameter measurements and provide an outlook on future reactor measurements. The KamLAND experiment underwent extensive purification in late 2008 to lower the radioactive backgrounds to allow for the measurement of solar neutrinos, in particular the contribution of Be7 neutrinos. I will finish the presentation with an update on the current solar phase of KamLAND.
        Orateur: Dr Patrick Decowski (Nikhef)
        Slides
      • 17:20
        Latest Results from SNO: The Low Energy Threshold Analysis 20m
        The SNO Collaboration has reanalyzed the data from the first two phases of the experiment -- the pure heavy water and salt phases -- in order to extend the acceptance of neutral- and charged-currents, and elastic scattering events down to an observed kinetic energy of 3.5 MeV. The combined nature of the analysis, with the reassessment of the systematic uncertainties and backgrounds, has resulted in an improved determination of the neutral-current flux of $^{8}$B solar neutrinos which is now measured with an accuracy of approximately 4\%. In the context of the solar standard model and neutrino oscillation theories, the newest SNO results are of great importance in understanding the energy production in the Sun and the interaction of neutrinos with matter. A new extraction method was developed to measure the absolute $^{8}$B flux scale and a set of analytic parameters describing the survival probability directly as a function of neutrino energy. The neutrino oscillation parameters were obtained from this new compact set of SNO-only observables, where the model survival probabilities were calculated in the context of matter-enhanced oscillations with the additional effect of $\theta_{13}$. A collection of results from solar and reactor experiments, combined with the SNO data, resulted in a global estimation of the neutrino mixing parameters with the interesting hint that $\theta_{13}$ might be different from zero.
        Orateur: M. Olivier Simard (CEA-Saclay)
        Slides
      • 17:45
        break 15m
    • 18:00 → 19:30
      Young Scientist Forum 3
      • 18:00
        Pion production from 30 GeV p+C at SHINE - first results 5m
        Orateur: Dr Sebastien Murphy
        Paper
        Slides
      • 18:05
        Lepton and Slepton mass matrices from $\Delta(54)$ symmetry 5m
        We have studied $\Delta(54)$ flavor model for leptons and sleptons. The tri-bimaximal mixing can be reproduced for arbitrary neutrino masses if vacuum alignments of scalar fields are guaranteed. The deviation from the tri-bimaximal mixing of leptons is predicted. The predicted upper bound for $\sin\theta_{13}$ is 0.06. The magnitude of $\sin\theta_{23}$ could be deviated from the maximal mixing considerably, but $\sin\theta_{12}$ is hardly deviated from the tri-maximal mixing. We have also studied SUSY breaking terms in the slepton sector. Three families of left-handed and right-handed slepton masses are degenerate. Even although flavor symmetry breaking effects are taken into account, our model leads to smaller values of flavor changing neutral currents than the present experimental bounds.
        Orateur: M. Hajime Ishimori (Niigata university)
        figure
        Paper
        Slides
      • 18:13
        Electron Neutrino Appearance Analysis at T2K 5m
        T2K is a long baseline neutrino beam experiment scheduled to begin operation in 2009. The energy of the muon neutrino beam from JPARC and the distance (295 km) to the far detector (Super-Kamiokande) have been chosen to maximize sensitivity to electron neutrino appearance through neutrino oscillation. By identifying this oscillation signal from among backgrounds, including NC pi0 production, a limit or measurement on theta 13 can be made.
        Orateur: Joshua Albert (Duke University)
        Paper
        proceedings source
        Slides
      • 18:21
        Probing Dark Matter with AGN Jets 5m
        Active Galactic Nuclei (AGN) are believed to reside in the center of massive dark matter (DM) halos. The energetic electrons and protons in AGN jets crossing regions of high DM density can scatter off the DM particles, producing gamma rays in the final state. If the DM is a weakly interacting massive particle (WIMP), its mass is such that the final state gamma-ray emission will be almost isotropic, unlike the collimated flux produced in standard processes of ambient photons up-scattering. For AGN jets pointing significantly off the line of sight, one might expect to detect the gamma-ray flux produced in DM-electron or DM-proton interactions and to disentangle it from the standard AGN off-axis gamma-ray emission, as well as from the gamma rays produced by DM pair annihilation. We study in detail processes involving electron-DM and proton-DM scattering with photons in the final state, in the context of supersymmetry and of universal extra dimensions. We then investigate if the spectral features can be detected by FERMI.
        Orateur: Lorenzo Ubaldi (University of California, Santa Cruz)
        proceedings
        Slides
      • 18:29
        Directional detection of galactic Dark Matter 5m
        Directional detection of galactic Dark Matter is a promising search strategy for discriminating geniune WIMP events from background ones. I will first review technical progress on directional detectors and present a comprehensive analysis method. The goal is to identify galactic Dark Matter by proving its correlation with the solar motion.
        Orateur: M. Julien Billard (LPSC Grenoble)
        Slides
      • 18:37
        One-loop Corrections to WIMP Annihilation Mediated by Boson with Finite Mass 5m
        Weakly interacting massive particle (WIMP) is a hopeful candidate of dark matter. In order to calculate the abundance of WIMP in the universe, its annihilation cross section is needed. We calculate the one-loop correction to the annihilation cross section in case that the correction is possible to be large. When a exchanged boson has negligible mass compared to the mass of annihilating WIMP, the loop correction is significantly enhanced. It is known as "Sommerfeld enhancement". Even if a boson mass is smaller than or equal to the WIMP mass, the correction cen be sizable. We calculate the correction in that case, and find a formula to include the one-loop correction to the thermally averaged cross section, which can be used in general WIMP model. We apply our result to neutralino dark matter in the minimal supersymmetric standard model (MSSM), and show the correction can be larger than 1%.
        Orateur: Mlle Keiko Nagao (Nagoya University)
        Paper
        Slides
      • 18:45
        Simulation of Antineutrino Rate From SONGS Reactor With DRAGON 5m
        Single-detector reactor-based oscillation experiments, like the first run of Double Chooz, require accurate predictions of the reactor flux. In this talk I present results from the deterministic lattice code DRAGON, which is used to simulate the nuclear fission rates of uranium and plutonium isotopes. These fission rates are then convoluted with the inverse beta decay cross section to obtain a prediction of the antineutrino rate as a function of time from the San Onofre Nuclear Generating Station (SONGS) reactor. The results are compared with data from the SONGS antineutrino detector. Applications to both nuclear nonproliferation and neutrino oscillation experiments are briefly discussed.
        Orateur: M. Christopher Jones (Massachusetts Institute of Technology)
        Paper
        Slides
      • 18:53
        Magnetic moment induced transition of neutrino between different mass states in matter 5m
        We consider the process of neutrino radiative transition between different mass states in medium. The neutrino wave functions, used in calculations of the process rate and power, are obtained within the method of exact solutions of the modified Dirac equation in medium. The contribution of magnetic moment induced transition is analyzed in details. It is shown how the background matter could influence the process substantially through the modification of initial and final neutrino states. We study the most important cases for the process total rate with different sets of parameters typical for astrophysical applications.
        Orateur: M. Alexey Lokhov (Graduate student)
        Slides
      • 19:01
        Dark Matter - but no Higgs - at the LHC? 5m
        While the Higgs Bosons of the Standard Model or MSSM have so far eluded direct detection, BSM models should address the strong hints pointing towards particle dark matter around or below the TeV scale. Based on a model [0805.1379v2] and parton level simulations in O'Mega/Whizard [0909.5330v1], I argue that thermal CDM candidates in alternative warped EWSB scenarios potentially exhibit a quite different phenomenology at the LHC compared to respective candidates in the MSSM, including increased chances of an early discovery.
        Orateur: Dr Alexander Knochel (Uni Freiburg)
        Slides
  • vendredi 12 mars
    • 08:30 → 12:00
      Neutrinos (cont)
      • 08:30
        NA61-SHINE: Hadron production measurements for neutrino/cosmic rays experiments 15m
        Both accelerator neutrino (e.g. T2K) and cosmic rays (e.g. Auger) experiments are detecting particles produced in primary and secondary hadronic interactions: neutrinos and muons from pi/K mesons decay respectively. The precise prediction of neutrino fluxes (for all species, different sources, etc) is crucial for the next generation of accelerator neutrino experiments to predict the expected number of signal and background events, while the precise prediction of air showers characteristics (longitudinal distribution, muon density, etc) is mandatory for the understanding of the composition of cosmic rays. In both cases those predictions can be improved by new hadron production measurements such as those performed in the NA61-SHINE experiment at CERN SPS. This talk presents the capabilities of hadron production measurements in NA61 in terms of acceptance and particle identification and how it covers the needs for the T2K neutrino flux predictions.
        Orateur: M. Nicolas Abgrall (University of Geneva, DPNC)
        Paper
        Slides
      • 08:50
        OPERA 15m
        Orateur: M. Dario Autiero (IPN Lyon, France)
        Slides
      • 09:10
        Recent Results and Prospects from MINOS 15m
        The MINOS experiment (Main Injector Neutrino Oscillation Search) uses two detectors separated from 735 km to measure the oscillation parameters of the beam of muon neutrinos produced by the NuMI facility. Neutrino oscillations are observed by comparing the observed energy spectrum at the Far Detector, in Northern Minnesota, with the expectation extrapolated from the measured spectrum at the Near Detector at Fermilab. This talk will describe three results. First, the observation of muon neutrino disappearance that gives the best measurement of $\Delta m^{2}_{23}$ to date. Secondly, the result from the 7% component of muon antineutrinos in the beam that allows us to study, for the first time in a long-baseline accelerator experiment, antineutrino oscillations and set a limit on their oscillation parameters. Finally, the search for electron neutrino appearance that sets a limit on the mixing angle $\sin^2(2\theta_{13})$.
        Orateur: Mlle Gwenaelle Lefeuvre (University of Sussex)
        Paper
        Slides
      • 09:30
        Supernova Neutrinos - a collective revolution of sorts 15m
        Understanding of supernova neutrinos has seen a qualitative change recently. It has been understood that neutrinos are not only affected by collisions with stellar matter, but also due to collisions among themselves. This effect, while ordinarily negligible, plays a crucial role in supernovae. The essential result is that close to the production surface, neutrino and anti-neutrinos of all energies undergo flavor conversion collectively. In this talk, I will review SN neutrino phenomenology, with an emphasis on collective oscillations and its possible signatures at neutrino detectors.
        Orateur: Dr Basudeb Dasgupta (Max Planck Institute for Physics)
        Slides
      • 09:50
        Results from SuperK 15m
        Super-Kamiokande is an underground water Cherenkov detector which consists of 50 ktons of pure water equipped with about 13000 photo-multipliers (PMTs). The front-end electronics and data acquisition system were upgraded in September 2008 and data-taking as a SK-IV phase was started. While it is a far detector of the T2K experiment, various other physics analyses are ongoing, such as atmospheric neutrino physics, solar neutrino, relic supernova neutrino search, indirect WIMP search etc. The current status and results from Super-K will be presented.
        Orateur: Dr Satoru Yamada (Institute for Cosmic Ray Research, the University of Tokyo)
        Paper
        Slides
      • 10:10
        break 15m
      • 10:30
        Detecting dark matter with IceCube 15m
        IceCube, a cubic kilometer neutrino telescope under construction at the South Pole, is a successor to the AMANDA neutrino telescope designed to search for astrophysical neutrino sources. When completed, it will consist of over 5000 optical modules buried in the Antarctic ice. The detector, which is currently 90% complete, includes an infill array known as DeepCore, improving sensitivity to neutrinos at energies below 100 GeV. IceCube can be used to indirectly probe the spin-dependent dark matter scattering and annihilation cross-section. I will present the current status of the IceCube dark matter analyses, as well as estimates for future IceCube sensitivity.
        Orateur: Dr Sven Lafebre (Dept. of Physics, Pennsylvania State University)
        Slides
      • 10:50
        Neutrino Properties from Large Neutrino Telescopes 15m
        We discuss new analysis for neutrinos from neutrino telescopes and the new physics that could be extracted from them. We show that high statistics atmospheric neutrino measurements in the IceCube Deep Core Array can provide useful information about neutrino oscillation parameters and other neutrino properties.
        Orateur: Irina Mocioiu (Pennsylvania State University)
        Paper
        Slides
    • 17:00 → 20:30
      Dark Matter, Astroparticles, Axions
      • 17:00
        Results from the ANITA Search for Ultra-High Energy Neutrinos 15m
        The ANITA (ANtarctic Impulsive Transient Antenna) experiment is an innovative balloon-borne radio telescope, designed to detect coherent Cherenkov emission from cosmogenic ultra high-energy neutrinos with energy greater than 10^18 eV. The second flight of the ANITA experiment launched on December 21st, 2008, and collected data for 30 days. This new data set allows for the most sensitive investigation to date of GZK neutrino flux models, which offer the exciting possibility of independently revealing the sources of the highest energy cosmic rays. I will present results of the analysis of the ANITA-II data set, and discuss calibration techniques, analysis methods, and background rejection.
        Orateur: Mlle Abigail Vieregg (UCLA)
        Paper
        Slides
      • 17:20
        Results from the Pierre Auger Observatory on Astroparticle Physics 20m
        The Pierre Auger Observatory has already collected more ultra high high energy cosmic ray data than all of the previous experiments. With an hybrid detection technique, it can provide coherent results on the flux, energy spectrum and arrival directions of the highest energy cosmic rays, and characterize the extensive air showers in order to probe the primary particle characteristics and its interactions. These results will be presented from the point of view of particle physics.
        Orateur: Dr Sofia Andringa (LIP)
        Minutes
        Slides
      • 17:45
        Dark Matter Constraints with the First Year of Fermi LAT Data 20m
        Our understanding of the Universe today includes overwhelming observational evidence for the existence of an elusive form of matter that is generally referred to as dark. Although many theories have been developed to describe its nature, very little is actually known about its properties. The launch of the Fermi Gamma-ray Space Telescope in 2008 opened a new window for the indirect experimental search for dark matter through high-energy gamma-rays. The principal instrument onboard, the Large Area Telescope (LAT), is designed to measure gamma-rays with energies ranging from 20 MeV to more than 300 GeV. The first year of Fermi LAT data has allowed for a large variety of dark matter searches and we present here a review of the results from the different analyses.
        Orateur: M. Tomi Ylinen (Royal Institute of Technology (KTH))
        Figures
        Paper
        Slides
      • 18:10
        Higgs in Space 15m
        In some classes of WIMP models, the Higgs boson could be copiously produced in association with a photon from dark matter annihilations in the center of our galaxy. The resulting photon spectrum possesses a line whose energy reflects the mass of the Higgs and of the WIMP and whose intensity depends on the WIMP spin and statistics. I will discuss how gamma-ray telescopes such as Fermi could provide information on the Higgs and dark matter complementary to that obtained at the LHC.
        Orateur: Geraldine Servant (CERN)
        Slides
      • 18:30
        break 15m
      • 18:50
        Axions and the transparency of the Universe 15m
        The propagation of high energy photons across the Universe is hindered by various radiation fields with which they interact. In this talk we will explain how the presence of an axion like particle can change this propagation and make the Universe more transparent. This results in high energy photons making it across cosmic gulfs we would normally not expect them to be able to traverse. We will review the observational situation and the uncertainties inherent in our lack of knowledge of the intergalactic radiation fields and indeed the magnetic field of the Milky Way.
        Orateur: Dr Malcolm Fairbairn (King's College London)
        Slides
      • 19:10
        Light through the wall (axions) : ALPS and review 20m
        In the last years it has been realized, that extensions of the Standard Model may manifest itself also at meV energy scales. The low energy frontier is a rich complement to the conventional high energy particle physics landscape. The search for this new particles initiated experimental activities around the world. "Light-shining-through-a-wall" experiments search for Weakly Interacting Sub-eV Particles (WISPs). Potential WISP candidates are axion like particles (ALPs) or hidden sector photons. The challenges and status of such enterprises as well as their future potential are presented with special emphasis on the ALPS experiment at DESY.
        Orateur: Dr Klaus Ehret (DESY)
        Paper
        Slides
  • samedi 13 mars
    • 08:30 → 10:35
      Summary talks
      • 09:00
        Summary - Theory 45m
        Orateur: Mlle Belen Gavela (Madrid autonoma Univ.Spain)
        Slides
      • 09:50
        Summary -Experiment 45m
        Orateur: M. Paul Grannis (Stony Brook University, USA)
        Slides
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