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# Rencontres de Moriond EW 2012

présidé par ,
de à (Europe/Paris)
 Description The XLVIIth Rencontres de Moriond session devoted to ELECTROWEAK INTERACTIONS AND UNIFIED THEORIES will be held in La Thuile from Saturday March 3rd to Saturday March 10th, 2012. 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 CNRS, IN2P3, CEA/IRFU (France) FNRS, Belgian Science Policy (Belgique) NSF (USA) Documents: document Support Email: moriond@lpsc.in2p3.fr
Go to day
• dimanche 4 mars 2012
• 08:30 - 11:35 Neutrinos
• 08:30 Opera results 15'  Intervenant: Dr. Andrea Longhin (INFN LNF Frascati) Documents:
• 08:50 The Price for Neutrino- Superluminality 15'  Intervenant: Alexander Vikman (CERN) Documents:
• 09:10 Results from T2K 15'  Intervenant: Masashi Otani (Kyoto univ.) Documents:
• 09:30 First result from the Double Chooz reactor-neutrino experiment 15'
The first results of neutrino oscillation analysis from the Double Chooz experiment is presented. Double Chooz aims to measure theta_13 precisely using two detectors with different baselines at approximately 400 m for near and 1 km for far detectors. Systematic uncertainties will be strongly suppressed by the two detectors. Double Chooz started physics data taking by the far detector since April 2011. Neutrino oscillation analysis was carried out using 100 days of physics data. As a result of the analysis using the number of neutrino candidate event and the energy spectrum, deficit of reactor electron anti-neutrino was observed. If confirmed with more data and lower systematics, this deficit indicates the existence of reactor-neutrino oscillation at short baseline as a consequence of non-zero theta_13.
 Intervenant: Dr. Tsunayuki Matsubara (Tokyo Metropolitan univiersity) Documents:
• 09:50 Solar-neutrino physics with Borexino 15'
Borexino is a large-volume liquid scintillator detector installed in
the underground halls of the Laboratori Nazionali del Gran Sasso in
Italy. After several years of construction, data taking started in May
2007. The Borexino phase I ended after about three years of data
taking. Borexino provided the first real time measurement of the 7Be solar neutrino interaction rate and confirmed the absence of its day-night assymetry with 1.4% precision; gave the first direct evidence of the pep neutrino signal and the strongest constraint of the CNO solar neutrino  flux to date. Borexino provided the measurement of the solar 8B neutrino rate with 3 MeV energy threshold.
In addition, Borexino sets the world best limits on hypothetical antineutrino fluxes from the Sun assuming undistorted 8B spectrum.
The review of all Borexino results within its solar neutrino program will be provided.
 Intervenant: Dr. Livia Ludhova (INFN Milano) Documents: Paper
• 10:10 coffee & tea break 20'
• 10:35 Review of neutrinoless double beta decay searches and recent results from EXO-200. 20'
Double beta decay can be the dominant decay mode of some even-even nuclei for which the single beta decay is energetically forbidden or highly spin suppressed. This is a Standard Model second order weak process that produces, among other things, two neutrinos (2νββ). Should neutrinos be Majorana in nature, double beta decay could proceed without the emission neutrinos (0νββ). The observation of this process would require neutrinos to have Majorana masses, which can be related to the 0νββ decay rate, and lepton number conservation would be violated. I will review the status of current neutrinoless double beta decay searches.

EXO-200, in particular, is a 200 kg liquid Xe time projection chamber that has been installed underground at the WIPP facility outside Carlsbad, New Mexico. EXO-200 is a prototype for a future 1-10 ton Xe detector but, due to its ultra low background, it has already provided the first measurement of the 2νββ decay mode of Xe-136. While 2νββ decay has been observed by other experiments, this is the first observation using Xe-136 and, with a half-life of 2.11±0.04(stat.)±0.21(syst.)x10^21 yr, also the rarest decay directly observed. EXO-200 is currently collecting more data in an attempt to observe or to otherwise set new limits on the half-life of the 0νββ decay mode of Xe-136. On behalf of the EXO Collaboration, I will provide an update on the status of our search for double beta decay.
 Intervenant: Dr. Ryan MacLellan (University of Alabama) Documents: Paper
• 11:00 Neutrinoless Double Beta Decay and Heavy Sterile Neutrinos 15'
The experimental rate of neutrinoless double beta decay can be saturated by the exchange of virtual sterile neutrinos, that mix with the ordinary neutrinos and are heavier than 200 MeV. Interestingly, this hypothesis is subject only to marginal experimental constraints, because of the new nuclear matrix elements. This possibility has been analyzed in the context of the Type I seesaw model, performing also exploratory investigations of the implications for heavy neutrino mass spectra, rare decays of mesons as well as neutrino-decay search, LHC, and lepton flavor violation.The heavy sterile neutrinos can saturate the rate only when their masses are below some 10 TeV, but in this case, the suppression of the light-neutrino masses has to be more than the ratio of the electroweak scale and the heavy-neutrino scale; i.e., more suppressed than the naive seesaw expectation. We have classified  the cases when this condition holds true in the minimal version of the seesaw model, showing its compatibility (1)~with neutrinoless double beta  rate being dominated by heavy neutrinos and (2)~with any light neutrino mass spectra. The absence of excessive fine-tunings and the radiative stability of light neutrino mass matrices, together with  a saturating sterile neutrino contribution, imply an upper bound  on the heavy neutrino masses of about 10 GeV. We extend our analysis to the Extended seesaw scenario, where the light and the heavy sterile neutrino contributions are completely decoupled, allowing the sterile neutrinos to saturate the present experimental bound on neutrinoless double beta decay. In the models analyzed, the rate of this process is not strictly connected with the values of the light neutrino masses,  and a fast transition rate is compatible with neutrinos lighter than 100 meV.
 Intervenant: Manimala Mitra (INFN, Laboratori Nazionali del Gran Sasso (LNGS), Assergi, Italy) Documents:
• 17:00 - 19:30 Neutrinos (cont)
• 17:00 First Results from KamLAND-Zen : Double beta decay with Xe-136 15'
KamLAND-Zen (KamLAND ZEro Neutrino double beta decay search) is a double beta decay experiment with ~300 kg of 90% enriched Xe-136 nuclei loaded into liquid scintillator.
Double beta decay (2nu mode) described by the process A(Z) -> A(Z+2) +2e- + 2nu is allowed by the standard model and has been measured with various isotopes. On the other hand, 0nu mode described as A(Z) -> A(Z+2) +2e- which violate the lepton number conservation and will provide the nature of neutrino (Majorana/Dirac test, its mass hierarchy and effective mass), is expected, however not yet observed.
In this talk, we will present the KamLAND-Zen first results, measurement of Xe-136 2nu mode half-life and new limit of 0nu mode with 10 ton-day data.
 Intervenant: Mrs. Azusa GANDO (Research Center for Neutrino Science, Tohoku University) Documents:
• 17:20 Nemo3 double beta decay 15'  Intervenant: Dr. Emmanuel Chauveau (University of Manchester) Documents:
• 17:40 Minerva 15'  Intervenant: Aaron Mislivec Documents:
• 18:00 Recent results from IceCube 15'
The IceCube detector, which is embedded in the glacial ice at the geographic South
Pole, is the first neutrino telescope to comprise a volume of one cubic kilometer. With
the construction of the detector being completed in early 2011, it now consists of a
total of 5484 optical modules. While its primary goal is search for neutrinos of
astrophysical origin, in conjunction with its surface component IceTop it also forms a
versatile cosmic ray laboratory. I will present the most recent results from data
accumulated during the construction phase with a focus on searches for electron
neutrinos, transient neutrino sources as well as cosmic ray observations.
 Intervenant: Dr. Sebastian Böser (Universität Bonn) Documents:
• 18:20 break 20'
• 18:45 Results from MEG 15'  Intervenant: Dr. Wataru Ootani (ICEPP, University of Tokyo) Documents:
• 19:30 - 20:19 YSF1
• 19:30 Multiple mechanisms in Neutrinoless Double beta decay 5'  Intervenant: Mlle. AURORA MERONI (SISSA) Documents:
• 19:37 Neutrino Directionality with Double Chooz 5'  Intervenant: Erica Caden Documents:
• 19:44 Probing neutrino masses in the RPV cMSSM at sqrt(s)=7 TeV 5'  Intervenant: Ms. Marja Hanussek (Bonn University) Documents:
• 19:51 Coherent Neutrino Scattering with Cryogenic Semiconductor Detectors 5'
Coherent neutrino scattering (CNS) is an unmeasured, well-predicted standard model process observable via low-energy nuclear recoils.  The latest generation of dark matter detectors is now achieving the recoil energy thresholds and fiducial masses needed to detect CNS for the first time.  We discuss an optimization of cryogenic phonon-mediated semiconductor detectors for measuring CNS from reactor neutrinos, intense electron capture neutrino sources, and decay-at-rest neutrino sources.  These configurations are able to place new neutral current constraints on sterile neutrinos, non-standard neutrino interactions, and other exotic physics.
 Intervenant: Mr. Adam Anderson (Massachusetts Institute of Technology) Documents:
• 19:58 Gamma-ray lines constraints in the NMSSM 5'  Intervenant: Dr. Guillaume Chalons (KIT-TTP Karlsruhe) Documents:
• 20:05 First light at the HAWC gamma ray detector in Mexico 5'  Intervenant: Daniel Fiorino Documents:
• 20:12 Critical nucleus charge in a superstrong magnetic field: effect of screening 5'
The results of the recent paper (http://arxiv.org/abs/1112.1891, accepted in Phys.Rev.) written in collaboration with B.Machet and M.I.Vysotsky are presented.

We investigated how radiative corrections in QED in a superstrong magnetic field change the value of critical charge Z_{cr}. We discovered that the phenomenon of screening of the Coulomb potential which has been discovered recently leads to the significant change: the nuclei with Z<52 never becomes critical; stronger B is needed for a nucleus with Z>52 to become critical  than without taking screening into account. We also analysed the contribution of higher loops to the effect of screening.
 Intervenant: Mr. Sergey Godunov (ITEP) Documents:
• lundi 5 mars 2012
• 08:30 - 11:30 Neutrinos and Dark Matter
• 08:30 CDMS dark matter search 15'  Intervenant(s): Nader Mirabolfathi, Dr. Jeter Hall (Fermi National Accelerator Laboratory) Documents:
• 08:50 Recent results of the CoGeNT Dark Matter experiment 15'
The CoGeNT experiment is searching for Dark Matter using a p-type point-contact germanium detector deployed underground in the Soudan Underground Laboratory in Soudan, Minnesota, USA.  The low-capacitance of the detector yields exceptionally low electronic noise and sub-keV thresholds, making it an excellent technology choice to search for a low-energy Dark Matter signal.  Recent results from data spanning 15 months indicate a modulation in the low-energy spectrum consistent with an annual period and with a significance of 2.8\sigma.  These results and related analyses will be discussed, including recent analyses and simulations aiming to investigate possible backgrounds contributing to the modulation.
 Intervenant: Dr. Michael Marino (Technische Universität München) Documents:
• 09:10 DAMA and CoGeNT : mu-bckgd and higher harmonic contributions 15'  Intervenant: Dr. Josef Josef Pradler (Perimeter Institute for Theoret) Documents:
• 09:30 COUPP dark matter search 15'  Intervenant: Dr. Jeter Hall (Fermi National Accelerator Laboratory) Documents:
• 09:50 KIMS dark matter search 15'  Intervenant: Dr. SeungCheon Kim (Department of Physics and Astronomy, Seoul National University) Documents:
• 10:10 tea & coffee break 20'
• 10:35 alternative DM models –a review 15'  Intervenant: Dr. maxim pospelov (university of victoria) Documents:
• 10:55 Limits on Lorentz Invariance Violation at the Planck Energy 15'  Intervenant: Prof. Tsvi Piran (Racah Institute for Physics Hebrew University Jerusalem Israel) Documents:
• 17:00 - 19:30 Dark matter (cont); Heavy flavour physics
• 17:00 CAST results and axion review 15'  Intervenant: Thomas Papaevangelou Documents:
• 17:20 Theoretical update on B-mixing 15'
We review the current status of the theory predictions for different observables in the B_s- and B_d mixing systems. A particular emphasis is given to some minor discrepancies between experiment and standard model predictions.
 Intervenant: Mr. Alexander Lenz (CERN) Documents:
• 17:40 LHCb Results on CP Violation in Bs Mixing 15'
LHCb has recorded approx 1fb-1 in 2011. Using these data we have measured the CP Violating phase "phis" in the Bs->J/PsiPhi channel and the Bs->J/PsiPiPi channel. In the former we also measure the Bs lifetime and lifetime difference. We have also resolved the two fold ambiguity in the solutions for phis and sign of the lifetime difference. These results will be described and the combined result for phis presented.
 Intervenant: Pf. peter clarke (CERN/ University Edinburgh) Documents:
• 18:00 New physics in Bs mixing and decay 15'  Intervenant: Ulrich Haisch Documents:
• 18:20 tea & coffee break 20'
• 18:45 Rare decays in LHCb 15'  Intervenant: Jose A Hernando (Universidade de Santiago de Compostela) Documents:
• 19:30 - 21:13 YSF2
• 19:30 A Solution to the Flavor Problem of Warped Extra Dimensions 5'
Extensions of the Standard Model (SM) featuring warped extra dimensions (Randall-Sundrum models) have a build-in protection mechanism, called RS-GIM, which prevents the occurrence of large flavor changing neutral currents. This mechanism is extremely successful and brings the RS model into agreement with a new physics scale of a few TeV in almost all flavor sectors. The single exception is CP violation in K-Kbar mixing, which receives excessive contributions from mixed-chirality operators absent in the SM. This is the so-called flavor problem of warped extra dimensions. We have recently shown that an extension of the strong interaction bulk gauge group can cancel these contributions to first order in the new-physics scale, so that the extended RS model represents a consistent theory of flavor at the TeV scale.
 Intervenant: Mr. Martin Bauer (Johannes-Gutenberg Universität Mainz) Documents:
• 19:37 Minimal flavour violation with non-linear realized EWSB 5'  Intervenant: Juan Yepes Documents:
• 19:44 Studies of the decay Bs -> DsK 45'
The decay mode $B^0_s \to D_s^\pm K^\mp$ allows for one of the theoretically cleanest time dependent measurements of the CKM angle $\gamma$. This contribution reports the observation of this decay mode at LHCb and the measurement of its world best measurement branching fraction relative to the Cabibbo--favoured mode $B^0_s \to D_s^-\pi^+$
based on data sample of 0.37 $\rm fb^{-1}$ proton--proton collisions at $\sqrt{s} = 7$~TeV collected in 2011.
 Intervenant: Ms. Barbara Storaci (Nikhef) Documents:
• 20:31 K^+ -> pi^+ pi^0 gamma in the Standard Model and Beyond 5'
After a short motivation to look for K^+ -> pi^+ pi^0 gamma we report improvements made on its theoretical description and exemplify its efficiency to constrain New Physics.
 Intervenant: M. Philippe Mertens (Université catholique de Louvain UCL - CP3) Documents: Sources
• 20:38 B->K(*)ll branching fractions and asymmetries from BABAR 5'
In a sample of 471 million BB events collected with the BABAR detector at the PEPII e+e- collider we study the rare decays B->K(*)l+l-, where l+l- is either e+e- or mu+mu-. We report results on partial branching fractions and isospin asymmetries in six bins of di-lepton mass squared. We further present CP and lepton-flavor symmetries for di-lepton masses below and above the J/Psi resonance. We find no evidence of CP or lepton-flavor violation. The partial branching fractions and isospin asymmetries are consistent with the Standard Model predictions and results from other experiments.
 Intervenant: Dr. Liang Sun (University of Cincinnati) Documents:
• 20:45 Measurement of the time-dependent CP-violation in $B^0 \to D^{*+} D^{*-}$ decays at Belle 5'
In this talk, the measurement of the branching fraction, polarization, and time-dependent CP-violation in $B^0 \to D^{*+} D^{*-}$ decays will be presented. It was performed with a data sample of 772 million $B \bar{B}$ pairs, collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider.
The time-dependent CP-violation in this $b \to c \bar{c} d$ transition is directly related to $\phi_1$, one of the angles of the CKM triangle. Depending on the relative angular momentum of the two $D^*$ mesons, both CP-even and CP-odd final states occur. For their statistical separation, an angular analysis was performed, using two of three angles of the transversity base.
 Intervenant: Bastian Kronenbitter (EKP, Karlsruhe Institue of Technology) Documents:
• 20:52 Time Integrated Analysis of B_s -> Phi Phi at LHCb 5'
Measurements of the polarization amplitudes are presented using a time integrated analysis for the decay B_s to phi phi using data collected by the LHCb experiment between March and November 2011. Also presented are measurements of T-violating triple product asymmetries, which if observed to be significantly different from zero could indicate the presence of new physics.
 Intervenant: Mr. Dean Lambert (University of Edinburgh) Documents:
• 21:00 ICARUS and Status of Liquid Argon Technology 5'
Icarus is the largest liquid Argon TPC detector ever built (~600 ton LAr mass). It operates underground at the LNGS laboratory in Gran Sasso. It has been smoothly running since summer 2010, collecting data with the CNGS beam and with cosmics. Liquid argon TPCs are really electronic bubble chambers'' providing a completely uniform imaging and calorimetry with unprecedented accuracy on massive volumes. Icarus is internationally considered as a milestone towards the realization of next generation of massive detectors (~tens of ktons) for neutrino and rare event physics. Results will be presented on the data collected during Run 2010 with the detector at LNGS.
 Intervenant: Ms. Izabela Kochanek (University of Silesia and LNGS, INFN) Documents:
• mardi 6 mars 2012
• 08:30 - 11:30 Heavy flavour physics (cont)
• 08:30 Search for the Bs and B0 decays to dimuons at CMS 15'  Intervenant: Mr. Luca Martini (INFN Pisa, CMS experiment) Documents:
• 08:50 Overview of constraints on new physics in rare B decays 15'
Rare B decays are sensitive probes of physics beyond the Standard Model. New physics effects can be parametrized by contributions to coefficients of dimension-six effective operators. Experimental data from the B-factories, Tevatron and in particular new LHCb results can be used to put model-independently constraints on these coefficients. This talk gives an overview of the current constraints, their implications for concrete new physics models and the impact on the prospects of future measurements.
 Intervenant: Dr. David Straub (Scuola Normale Superiore, Pisa) Documents:
• 09:10 Rare decays and MSSM phenomenology 15'  Intervenant: Dr. Andreas Crivellin (ITP Bern) Documents:
• 09:30 Heavy flavour measurements at the Tevatron 15'  Intervenant: Mr. Guennadi Borissov (Lancaster University) Documents:
• 09:50 Heavy flavour measurements in ATLAS and CMS 15'  Intervenant: Jochen Schieck Documents:
• 10:10 coffee & tea break 20'
• 10:35 Lattice & Flavour review 15'  Intervenant: Gilberto Colangelo Documents:
• 10:55 A selection of recent results from BABAR 20'
We present recent results from the BABAR collaboration in several areas of research. These include searches for new physics via CP violation in tau lepton decays, lepton-flavor violation in B decays, and measurements of radiative-penguin B decays.
 Intervenant: Dr. Vincent Poireau (LAPP) Documents:
• 17:00 - 19:30 Heavy flavour and charm physics
• 17:00 Results on direct CP Violation on B decays in LHCb 15'
Three recent results from the LHCb experiment on direct CP violation in the B and Bs systems are presented.

1) A study of B± → J/ψπ± and B± → ψ(2S)π± decays was performed with data corresponding to 0.35 fb−1 of proton-proton collisions at √s = 7 TeV. No evidence of direct CP violation is seen.

2) Using the same data sample, also the K±π∓ final state is analysed. First evidence of CP violation in the decays of Bs0 mesons to K±π∓ pairs is reported: ACP (Bs0 → Kπ) = 0.27 ± 0.08 (stat) ± 0.02 (syst), with a significance of 3.3σ.

3) On the full 2011 dataset of 1fb-1, the decays B± → DK± and B± → Dπ± were analyzed, where the D is reconstructed in the two-body final states: KK, Kπ and ππ. Measurements of several observables are made, that bear significance to a measurement of CKM angle gamma. This includes the first observation of the suppressed mode: B± → [π±K∓]DK±. In a combined fit to all the  modes DK± considered, CP -violation is observed with a significance of 5.8σ.
 Intervenant: Till Moritz Karbach (TU Dortmund) Documents:
• 17:20 Recent electroweak physics results at Belle 20'
Flavor sector is the largest contributor to the total number of free
parameters within the standard model (SM) of elementary particle, a
confluence of electroweak interactions and quantum chromodynamics.
Therefore, it provides an excellent ground to test SM predictions and
by doing so to look for possible new physics signature. We summarize
recent results on an array of electroweak measurements performed by
the Belle experiment with the data collected near the Y(4S) and Y(5S)
resonances at the KEKB asymmetric-energy e+e- collider.
 Intervenant: Dr. Gagan Mohanty (Tata Institute of Fundamental Research) Documents:
• 17:45 Precision flavor physics from the lattice 15'
I present recent precision results from lattice QCD regarding the masses of light quarks and neutral kaon mixing. These calculations were carried out directly at the physical point with full control over all systematic uncertainties. The masses of the u, d and s quarks are determined with an accuracy of a few percent while the neutral kaon mixing parameter B_K has an overall uncertainty of slightly over one percent. In particular, we find that m_u is more than 20 standard deviations away from 0 and that our standard model prediction for indirect CP violation in K->\pi\pi decays is in agreement with observation.
 Intervenant: Dr. Christian Hoelbling (Wuppertal University) Documents:
• 18:05 Direct CP violation in D decays 15'  Intervenant: Jure Zupan (SISSA) Documents:
• 18:25 tea & coffee break 20'
• 18:50 CP Violation in charm and other LHCb charm results 15'
LHCb's vast heavy flavour datasets provide a new opportunity for precision tests of the Standard Model and searches for New Physics such as new sources of CP violation in charm decays, and new physics contribution to highly suppressed decays such as D->mu mu.
 Intervenant: Dr. Jonas Rademacker (University of Bristol) Documents:
• 19:30 - 20:45 YSF3
• 19:30 Abelian symmetries in N-Higgs-doublet Models 5'  Intervenant: Mrs. Venus Ebrahimi-Keus (University of Liege) Documents:
• 19:37 A vectophobic 2HDM in the light of the LHC 5'  Intervenant: Mlle. Elvira Cervero (UCLouvain) Documents: Papier
• 19:44 Effective couplings approach: neutralino dark matter relic density 5'  Intervenant: Suchita Kulkarni Documents:
• 19:51 Gravitino DM: Long-lived staus at the LHC 5'  Intervenant: Jan Heisig (Hamnburg University) Documents:
• 19:58 Search for SUSY R-hadrons in ATLAS 5'  Intervenant: Morten Jorgensen (Niels Bohr Institute) Documents:
• mercredi 7 mars 2012
• 08:30 - 12:30 EWSB in the Standard Model
• 08:30 Symmetry breaking and the Scalar boson - evolving perspectives 25'
The mechanism extending spontaneous symmetry breaking to gauge fields had a considerable impact on elementary particle physics. It is corroborated by the discovery of the Z and the W, and by the precision electroweak tests. A detection of its Scalar boson(s) would not only constitute a direct verification of the mechanism, but knowledge of its couplings to known particles could pave the way to the world hitherto hidden beyond the Standard Model. These topics are discussed with emphasis on conceptual issues.
 Intervenant: Prof. François ENGLERT (UNIVERSITE LIBRE DE RUXELLES) Documents:
• 09:00 The Search for the BroutEnglertHiggs Boson New Results from the DØ Experiment 20'  Intervenant: Joseph Haley (Princeton University) Documents:
• 09:25 The Search For The BroutEnglertHiggs Boson With Up To 10/fb With CDF 15'  Intervenant: Dr. Homer Wolfe (The Ohio State University) Documents:
• 09:45 Seeking the BroutEnglertHiggs Boson New Results from Tevatron Experiments 15'  Intervenant: Wade Fisher Documents: Paper
• 10:05 coffee & tea 20'
• 10:30 SM scalar boson search with ATLAS 25'
Latest results of the Standard Model searches for the Scalar Boson with the ATLAS experiment are presented, based on a dataset corresponding to an integrated luminosity of up to 4.9 fb−1  of pp collisions collected at s√  = 7 TeV at the LHC. A wide range of the Scalar Boson masses from 110 GeV to 600 GeV has been explored. The exclusion limits at the 95% confidence level are given as a function of the Scalar Boson mass for individual channels and their combination. An observed small excess of events above the background expectation is addressed.
 Intervenant: Dr. Sandra Kortner (Max-Planck-Institut für Physik) Documents:
• 11:00 Searches for the SM Scalar Boson at CMS 25'
The methods and results of the searches for the Standard Model scalar boson predicted by the BEH mechanism will be described.
The analysis is based on 5 fb-1 of proton-proton collision data collected with the CMS detector at LHC at 7 TeV centre-of-mass energy in 2011.
The results of these searches exclude at 95% CL a large mass range.
At low mass, between approximately 115 and 130 GeV, we observe some excess in the data that will be described in details.
 Intervenant: Dr. Marco Pieri (UC San Diego) Documents:
• 11:30 Introduction to the discussion on searches for the BEH scalar boson 25'
As an introduction to the discussion to follow, the recent results on searches for the BEH scalar boson are (sometimes critically) summarized.
 Intervenant: Mr. Jean-Francois Grivaz (LAL - Orsay) Documents:
• 17:00 - 20:20 EWSB (SM and beyond). Precision tests
• 17:00 LHC: Standard and Hidden Scalar Bosons 15'
The scalar Higgs boson is the final missing piece of the Standard Model and crucial to understand electro-weak symmetry breaking. After its
discovery, the next step will be to determine its properties, in
particular also its couplings, as precisely as possible.
In this talk, we will discuss the prospects of measuring these couplings
at the LHC. Thereby, we can test their agreement with the Standard Model
prediction, or look for possible modifications in models of new physics
and quantify deviations.
 Intervenant: Dr. Michael Rauch (Univ. Karlsruhe, KIT) Documents:
• 17:20 Tevatron searches for BSM BEH Bosons 15'
Using the full dataset (10 fb-1) delivered by the Fermilab Tevatron, the CDF and D0 experiments are actively seeking evidence for the Brout-Englert-Higgs (BEH) boson in beyond the standard model (BSM) scenarios, particularly in supersymmetric models and fermiophobic scenarios.   The simplest supersymmetric extension to the standard model, the Minimal Supersymmetric Standard Model (MSSM), requires the introduction of two Higgs doublet fields, which predict the existence of five physical BEH bosons after symmetry breaking.  Alternatively, in fermiophobic models, the symmetry breaking mechanism responsible for giving masses to gauge bosons is separate from that which generates the fermion masses.  A selection of final results from searches for the BSM BEH boson carried out by CDF and D0 are presented.
 Intervenant: Azeddine Kasmi (Baylor University) Documents:
• 17:40 Strong electroweak symmetry breaking 15'
In the absence of an elementary scalar boson the perturbative description of the Standard Model breaks down at energies around 1TeV. Heavy spin-1 fields coupled to W and Z bosons can extend the validity of the theory up to higher scales. In my talk I will discuss the prospects to observe the degrees of freedom that unitarize the WW scattering amplitudes in the context of strong electroweak symmetry breaking saturated by vector resonances. The study performed in a simple self-consistent setup with a well defined range of validity will enable us to answer the question about the allowed mass range for the lightest set of resonances.
 Intervenant: Mrs. Anna Kaminska (University of Warsaw) Documents:
• 18:00 How to tell apart non-standard EW symmetry breaking mechanisms 20'
In this talk we briefly summarize non-standard EWSB scenarios and the ways to tell them apart at the LHC.
 Intervenant: Prof. Veronica Sanz (York University) Documents:
• 18:25 SUSY and BSM Scalar searches in ATLAS and CMS 20'  Intervenant: Sridhara Dasu Documents:
• 18:50 coffee & tea break 20'
• 19:15 W mass measurement from D0 15'  Intervenant: Dr. Hengne LI (LPSC) Documents:
• 19:35 W mass measurement from CDF 15'  Intervenant: Dr. Bodhitha Jayatilaka (Duke University) Documents:
• 19:55 EW measurements from ATLAS and CMS 20'  Intervenant: Jan Kretzschmar (jan.kretzschmar@liverpool.ac.uk) Documents:
• jeudi 8 mars 2012
• 08:30 - 11:25 EWSB (SM and beyond), Precision tests, SUSY
• 08:30 New spectra in the HEIDI models 20'
We construct new spectra in the HEIDI models and compare with
recent LHC results
 Intervenant: Prof. Jochum van der Bij (Physik Freiburg) Documents:
• 08:55 Single W and Z production asymetries at Tevatron 15'  Intervenant: Thomas Phillips (Duke University) Documents: Paper
• 09:15 Diboson physics from the Tevatron 20'
We present recent measurements of diboson production at
the Tevatron Collider at sqrt{s}=1.96 TeV, analyzing fully
leptonic and semileptonic final states (including heavy
flavor jets) in data collected by the CDF and D0 detectors
between 2002-2011. The analyzed final states in Vgamma and
VV decays (V = W,Z) are of significant importance for testing
the electroweak sector of the Standard Model (SM) and they
are directly relevant to searches for a low mass Higgs boson
and the physics beyond the SM.
 Intervenant: Dr. Jadranka Sekaric (University of Kansas) Documents:
• 09:40 Implication of LHC scalar searches on warped extra dimensions 25'  Intervenant: Matthias Neubert Documents:
• 10:10 coffee & tea break 20'
• 10:35 SUSY searches in LHC 20'  Intervenant: Steven Lowette Documents:
• 11:00 SUSY status after one year of LHC 20'  Intervenant: Sabine Kraml (LPSC Granoble) Documents:
• 17:00 - 19:00 SUSY , Top physics
• 17:00 SUSY and a 125 GeV Scalar 15'  Intervenant: Dr. Nazila Mahmoudi (LPC Clermont) Documents:
• 17:15 Search for Dark Matter in Monojet and Monophoton events (CMS) 15'  Intervenant: Dr. Steve Worm (CERN / RAL) Documents:
• 17:30 Supersymmetric models with light higgsinos 15'
In the Minimal Supersymmetric Standard Model, the higgsinos can have masses around the electroweak scale, while the other supersymmetric particles have TeV-scale masses. This happens in models of gauge-mediated SUSY breaking with a high messenger scale, which are motivated from string theory. Multi-TeV squark and gluino masses are natural for particular choices of the messenger field content, somewhat similar to focus point supersymmetry. They can lead to Higgs masses of 124-126 GeV, while making the discovery of supersymmetry at the LHC unlikely. The light higgsinos are also difficult to see at the LHC but may eventually be discovered at a linear collider.
 Intervenant: Dr. Felix Bruemmer (DESY) Documents:
• 17:45 Gluinos lighter than s-quarks and detection at LHC 15'
I present a revisited overview on FCNC constraints for models where gluinos are of O(1) TeV and s-quarks of O(10) TeV. Then I extend the analysis of possible signals of these models at the LHC, such as gluino decay chains and typical wino decays producing soft pions at the final state.
 Intervenant: Prof. Liliana Velasco-Sevilla (Cinvestav) Documents:
• 18:00 Phenomenology of SUSY with intermediate scale physics 15'
The presence of fields at an intermediate scale between the Electroweak and the Grand Unification scale modifies the evolution of the gauge couplings and consequently the running of other parameters of the Minimal Supersymmetric Standard Model, such as gauginos and scalar masses. The net effect is a modification of the low energy spectrum. I will discuss the main phenomenological consequences and the possibility of testing intermediate scale physics at the LHC.
 Intervenant: Carla Biggio (IFAE) Documents:
• 18:15 Single top physics in ATLAS 15'  Intervenant: Martin zur Nedden Documents:
• 19:00 - 20:00 Moriond discussion
• vendredi 9 mars 2012
• 08:30 - 11:35 Beyond the Standard Model, Lepton flavour
• 08:30 Searches for 3rd generation SUSY in ATLAS 15'  Intervenant: Dr. Antoine Marzin (University of Oklahoma) Documents:
• 08:50 Natural Explanation for Light Stops 25'  Intervenant: Lisa Randall Documents:
• 09:20 BSM searches in ATLAS and CMS 20'  Intervenant: David Adams Documents:
• 09:45 Realistic SO(5)xU(1) model in RS space 15'
The gauge bosons and Higgs boson are unified in the five dimensional RS spacetime.
The Higgs boson is identified with a part of the fifth dimensional component
of the gauge potential.  In the SO(5)xU(1) gauge-Higgs unification
the EW symmetry is dynamically broken.  The Higgs boson, predicted with a mass
around 130 GeV,  naturally becomes stable so that it appears as missing energy and momentum in the LHC experiments.  Collider signatures such as gauge couplings of
quarks and leptons and production of KK gamma and Z are also discussed.
 Intervenant: Prof. Yutaka Hosotani (Osaka University) Documents:
• 10:05 coffee & tea break 20'
• 10:30 Long Lived Exotica at the LHC 15'  Intervenant: Tomer Volansky Documents:
• 10:50 Tensions with the 3 - neutrino paradigm 20'  Intervenant: Dr. Boris Kayser (Fermilab) Documents:
• 11:15 Minos Nova, Fnal perspective 15'  Intervenant: Mark Messier Documents:
• 17:00 - 19:10 Top Physics
• 17:00 Top quark production at the Tevatron 15'
We present the most recent Tevatron  results on top pairs and single top production obtained by the CDF and D0 collaborations. We'll  show the cross section measurements, the ttbar forward-backward asymmetry analyses, the evidence for spin correlation in ttbar production, the ratio R measurement and the determination of the CKM matrix element Vtb.
 Intervenant: Dr. Sandra Leone (INFN Pisa) Documents:
• 17:15 The ttbar asymmetry in the SM 20'
A sizeable difference in the differential production cross section of top- compared to antitopquark production, denoted charge asymmetry, has been observed at the Tevatron. The experimental results seem to exceed the theory predictions based on the Standard Model by a significant amount and have triggered a large number of suggestions for ”new physics”. In this talk we review the Standard Model predictions for Tevatron and LHC experiments.
 Intervenant: Dr. German Rodrigo (IFIC Valencia) Documents:
• 17:35 Top properties (mass, width, spin correlations) at the Tevatron 15'  Intervenant: Mr. Viatcheslav Shary (CEA, Saclay, France) Documents: Papier
• 17:50 Top physics in ATLAS and CMS 20'  Intervenant: Pedro Ferreira da Silva Documents:
• 19:10 - 20:30 YSF4
• 19:10 Strong SO(10)-inspired leptogenesis: predictions and justification. 5'
Focusing on the SO(10)-inspired model of leptogenesis, I will show that a class of solutions respects the restrictive strong thermal leptogenesis requirements.

When strong thermal leptogenesis is achieved, pre-existing flavoured B-L asymmetries produced by potential external mechanism are completely washed out during the same leptogenesis. As a consequence the amount of Baryon Asymmetry produced is totally independent of the initial conditions, encoded in the state of the Universe after the inflation era.

Therefore, by adopting these solutions, the SO(10)-inspired model of leptogenesis justifies the measured amount of Baryon Asymmetry in our Universe and, at the same time, provides sharp predictions on the low energy neutrino parameters.
 Intervenant: Mr. Luca Marzola (University of Southampton) Documents: Transparents
• 19:17 Measurement of the Z+b cross section at CMS 5'
Production of a Z boson in association with b jets is a background in multiple searches for physics beyond the Standard Model, as well as in different searches for the Higgs boson. Furthermore, the measurement of the Z+b cross section can be used to measure PDFs and to test the predictions from theory. In this talk the measurement of the Z+b cross-section, using a sample of 2.1fb-1 of proton-proton collisions collected at a center-of-mass energy of 7 TeV at the CMS experiment, is presented, and compared with predictions from MC event generators.
 Intervenant: Dr. Tristan du Pree (UCLouvain) Documents:
• 19:24 b-tagging calibration using top pair events with the ATLAS experiment 5'
Many physics analyses with the ATLAS detector expect to have jets originating from b-quarks. Algorithms that allow to identify those jets are thus of great importance and it is crucial to understand their performance. In the final state of top quark pairs decays at least two b-jets are present. This b-enriched sample provides a perfect environment for calibration of b-tagging algorithms for analyses with large multiplicity of high pT jets, for example Higgs or SUSY searches. This approach takes advantage of the large cross-section of the top quark pair production at the LHC and a good understanding of this process after the initial phase of data taking with the ATLAS detector. To measure the b-tagging efficiency in the single lepton channel a slightly modified tag and probe method is applied to top quark pairs events selected from data. Alternatively, in both single lepton and dilepton channels, b-tagged jets in an event can be counted. This method provides as well a top quark pairs production cross-section estimation.
 Intervenant: Agnieszka Leyko Leyko (University of Bonn) Documents:
• 19:31 Search for the SM scalar boson in ZH -> nunubb at D0 5'  Intervenant: Abhinav Dubey (University of Delhi) Documents:
• 19:38 Observation of Diffractively Produced W bosons in pp collision with the CMS Experiment 5'
I present a study of the forward energy flow in leptonically decaying W bosons using data of an integrated luminosity corresponding to 36 pb-1 of pp collision data at a centre-of-mass energy of 7 TeV. This data was recorded with the CMS detector during the 2010 running of the LHC. In this sample of W events, about 300 events with a rapidity gap of no significant energy deposit in one of the forward calorimeters are observed. This corresponds to a large pseudorapidity gap of at least 1.9 units. The majority of the charged leptons from these W decays are found in the hemisphere opposite to the gap. This gives a strong indication of a diffractive component in the W production, which can be explained in terms of diffractive PDFs which peak at smaller x than the conventional proton PDFs.
 Intervenant: M. Juerg Eugster (Institute for Particle Physics, ETH Zurich) Documents: Papier
• 19:45 H->WW->lnulnu in ATLAS 5'  Intervenant: Joshua Kunkle (University of Pennsylvania) Documents: Slides
• 19:52 Measurement of the ttbar Production Cross Section at √s = 7 TeV in Lepton + Jets Events using b-quark Jet Identification Techniques 5'
An updated measurement of the production cross section for pp -> ttbar at a center-of- mass energy of 7 TeV using data collected by the CMS detector at the Large Hadron Collider is presented. Top quark pair production candidate events are selected based one the presence of an isolated muon or electron of high transverse momentum, large missing transverse energy and hadronic jets. At least one jet is required to be consistent with originating from a b-quark. The analysed dataset corresponds to an integrated luminosity of 0.8 (1.1)/fb for the electron (muon) sample. The cross section is extracted with a profile likelihood method using a fit to the number of reconstructed jets, the number of b-tagged jets, and the secondary vertex mass distribution. The measured cross section is 164.4 ± 2.8 (stat.) ± 11.9 (syst.) ± 7.4 (lum.) pb, consistent with higher order QCD calculations.
 Intervenant: Dr. Sadia Khalil (Kansas State University) Documents:
• 19:59 Single Top Quark Production at DØ 5'
We present new measurements of the single top quark production cross section in ppbar collisions at sqrt(s) = 1.96 TeV using data corresponding to 5.4 fb^−1 of integrated luminosity collected by the D0 detector at the Fermilab Tevatron Collider. The large mass of the top quark, close to the electroweak symmetry-breaking scale, makes it a good candidate for probing physics beyond the Standard Model, including possible anomalous couplings. We examine the data to study the Lorentz structure of the Wtb coupling. We find that the data prefer the left-handed vector coupling and set upper limits on the anomalous couplings.
 Intervenant: Ms. Jyoti Joshi (University of California, Riverside) Documents: Paper
• samedi 10 mars 2012
• 09:00 - 11:00 Conference summaries
• 09:00 Experimental summary 45'  Intervenant: Alain Blondel (UNIGE) Documents:
• 09:55 Theory summary 45'  Intervenant: Wilfried Buchmuller Documents: