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Rencontres de Moriond EW 2014

présidé par Lydia Iconomidou-Fayard (LAL), Jean Marie Frere (ULB Brussels)
de à (Europe/Paris)

The XLIXth Rencontres de Moriond session devoted to ELECTROWEAK INTERACTIONS AND UNIFIED THEORIES will be held in La Thuile from Saturday March 15th to Saturday March 22th, 2014.

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

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  • dimanche 16 mars 2014
    • 08:30 - 12:10 Heavy Flavours
      Sunday March 16th: Heavy Flavours
      • 08:30 Recent constraints on CKM and New Physics by Belle 20'
        Recent constraints on CKM and New Physics by Belle
        Intervenant: Martin Ritter (Max-Planck-Institut für Physik)
        Documents: Slides pdf file
      • 08:55 Latest rare decays results from LHCb 15'
        Latest rare decays results from LHCb
        Intervenant: Dr. Mitesh Patel (Imperial College London)
        Documents: Slides pdf file
      • 09:15 Recent Lattice results relevant for heavy flavour phenomenology 20'
        Intervenant: Dr. Francesco Sanfilippo (University of Southampton)
        Documents: Paper pdf file Transparents pdf file
      • 09:40 Constraining the CKM Angle Gamma at LHCb 15'
        The latest results from the LHCb experiment relating to measurements of the CKM angle Gamma are summarised.
        Intervenant: Dr. Laurence Carson (University of Edinburgh)
        Documents: Paper unknown type file Transparents powerpoint file pdf file
      • 10:00 Tea or Coffee break 15'
      • 10:20 Charm mixing and CP violation at LHCb 15'
        Recent results on charm mixing and CP violation from the LHCb experiment
        Intervenant: Dr. Angelo Di Canto (CERN)
        Documents: Slides pdf file
      • 10:40 Global fits to radiative b->s transitions 15'
        Global fits to radiative b->s transitions
        Intervenant: Dr. Sébastien Descotes-Genon (LPT Orsay)
        Documents: Transparents pdf file
      • 11:00 New Physics in radiative b->s transitions 15'
        Recent experimental results on angular observables in the rare decay B --> K* mu+mu- show deviations from Standard Model predictions. In this talk I will discuss the possibility that these deviations are due to new physics.
        Intervenant: Dr. Wolfgang Altmannshofer (Perimeter Institute)
        Documents: Slides unknown type file pdf filedown arrow
    • 17:00 - 20:20 Heavy Flavours
      Sunday March 16th: Heavy Flavours
      • 17:00 A bound on the charm chromo-EDM and its implications 15'
        We derive bounds on the electric and chromo-electric dipole moments of the charm quark. The second one turns out to be particularly strong, and we quantify its impact on models that allow for a sizeable flavour violation in the up quark sector, like flavour alignment and Generic U(2)^3. In particular we show how the bounds coming from the charm and up CEDMs constrain the size of new physics contributions to direct flavour violation in D decays. We also specialize our analysis to the cases of Supersymmetry with split families and composite Higgs models. The results exposed in this talk motivate both an increase in experimental sensitivity to fundamental hadronic dipoles, and a further exploration of the SM contribution to flavour violating D decays.
        Intervenant: Filippo Sala (IPhT CEA-Saclay)
        Documents: Slides pdf file
      • 17:20 Highlights of charm physics at BESIII 10'
        The BESIII experiment at the BEPCII in Beijing had collected about 2.9 fb-1 data sample at psi(3770) peak, which is almost three times of that from CLEO-c. We present the most recent charm results from the BESIII experiment. Especially, the strong phase measurements is addressed by using the Quantum Correlation at DDbar threshold.
        Intervenant: Dr. Hai-Bo Li (Institute of High Energy Physics)
        Documents: Paper pdf file Slides pdf file
      • 17:35 Latest results on radiative penguin decays at Babar 10'
        Intervenant: Eli Ben-Haim (LPNHE, IN2P3-CNRS, Universities of Paris VI)
        Documents: Slides pdf file
      • 17:50 Tevatron heavy flavor results on lifetimes, decays and mixing 15'
        Intervenant: Simone Donati (University of Pisa - INFN)
        Documents: Paper pdf file Slides pdf file
      • 18:10 B_q -> ll and electroweak interactions 15'
        Flavour changing rare decays provide important tools to test the standard model and 
        constrain the parameter space of physics beyond the standard model. 
        The decay of a B_s or B_s meson into two charged leptons has a unique sensitivity to new physics and can be calculated with high precision in the standard model. I will discuss the recently calculated two-loop electroweak corrections to this decay and show how the previously large electroweak scheme ambiguities are rendered negligible at this order.
        Intervenant: Martin Gorbahn (University of Liverpool)
        Documents: Slides pdf file
      • 18:30 Tea or Coffee break 15'
      • 18:45 Updated SM predictions for B_q ‐ >ll at NLO EW and NNLO QCD 15'
        The latest Standard Model predictions are reviewed for the rare leptonic B_{d,s} -> ell^+ ell^- decays, based on recent results of NLO electroweak and NNLO QCD corrections.
        Intervenant: Dr. Christoph Bobeth (TU Munich, IAS)
        Documents: Slides pdf file
      • 19:05 Anomalous dimuon charge asymmetry in proton-antiproton collisions 15'
        The D0 Collaboration presents the final
        measurement of the inclusive muon and like-sign dimuon
        charge asymmetries in proton-antiproton	collisions.
        The measurements differ from the Standard Model 
        prediction by 3.6 standard deviations.
        Intervenant: Prof. Bruce Hoeneisen (Universidad San Francisco de Quito)
        Documents: Paper unknown type file Slides pdf file
      • 19:30 Electroweak Heavy Flavour Measurements with ATLAS and CMS 20'
        Intervenant: Dr. Stefano Argiro (University of Torino)
        Documents: Slides pdf file
      • 19:55 CP violation in the B(s)0 system at LHCb 15'
        CP violation in the B(s)0 system at LHCb.
        Intervenant: Mrs. Francesca Dordei (Heidelberg University)
        Documents: Slides pdf file summary unknown type file pdf file
  • lundi 17 mars 2014
    • 08:30 - 12:00 Neutrino experiments
      Monday March 17th : Neutrino experiments
      • 08:30 An introduction to: Neutrinos today 25'
        Intervenant: Guido Altarelli (CERN)
        Documents: Paper pdf file Slides pdf file
      • 09:00 Latest results of OPERA 15'
        The OPERA experiment, located in the underground Gran Sasso laboratory is designed to detect mu-neutrino to tau-neutrino oscillations in appearance mode. The detectors, placed on the long-baseline CERN to Gran Sasso neutrino beam (CNGS) 730 km away from the source, consists of an emulsion/lead target complemented by electronic detectors. OPERA has been taking data for five years, from 2008 to 2012, and on the analyzed statistics three tau candidate events were confirmed by end of 2013.
        In this talk I will describe the detector as well as the special procedures used to locate the interactions vertices and detect different topologies. The three candidate events found so far and the results on oscillations with the latest analyzed statistics will be presented.
        Intervenant: Dr. Cecile Jollet (IPHC/Universite de Strasbourg)
        Documents: Paper unknown type file Slides pdf file
      • 09:20 Oscillation results from T2K 15'
        The Tokai to Kamioka (T2K) experiment is a long baseline neutrino oscillation experiment situated in Japan. A high intensity neutrino beam is produced at the Japan Proton Accelerator Research Complex, in Tokai, Japan. A near detector complex, situated 280 m from the neutrino production target, and the far detector at 295 km, are used to detect the neutrinos from this beam. This talk will review the latest T2K results on neutrino oscillation using the data collected up to May 2013, including the observation of electron neutrino appearance from a muon neutrino beam and a high precision measurement of muon neutrino disappearance. Now that all of the neutrino mixing angles have been measured, the next step is to search for CP violation in the lepton sector, to which only appearance experiments are sensitive. Efforts towards high precision measurements of CP violation, theta23, and sensitivity to the neutrino mass hierarchy will be discussed.
        Intervenant: Mr. Patrick de Perio (University of Toronto)
        Documents: Paper unknown type file pdf file Slides pdf file
      • 09:40 Sensitivity of oscillation experiments to the neutrino mass hierarchy 15'
        The large value of $\theta_{13}$ recently discovered at reactor neutrino experiments has opened the door to determine the ordering of their mass eigenstates in the near future. However, since the neutrino mass ordering is a discrete parameter it is not clear whether the median sensitivity of a given experiment would coincide with the usual values reported in the literature. I will present a summary of the different possibilities to determine the neutrino mass ordering in the near future, and I will briefly discuss the statistical issues related to the significance of the signal for this measurement.
        Intervenant: Pilar Coloma (Virginia Tech)
        Documents: Paper pdf file Slides pdf file
      • 10:00 Double Chooz: new results towards the near detector phase 15'
        New oscillation results from the Double Chooz experiment will be presented, accounting for the data collected in 467.9 live days. The precision in the measurement of the mixing angle theta13 has been improved by means of a higher signal-to-background ratio and reduced systematic uncertainties in detection, backgrounds and energy scale. This new powerful analysis will boost the results of the experiment during the near detector phase, to be started in summer 2014, when the reactor-related systematics will be canceled out almost completely.
        Intervenant: Dr. Pau Novella Garijo (CNRS/APC)
        Documents: Paper unknown type file pdf file Slides pdf file
      • 10:20 Tea or Coffee break 15'
      • 10:40 Neutrino mixing from a minimum principle 15'
        The Standard Theory of elementary particle physics admits a large flavor symmetry in the absence of Yukawa interactions. This symmetry is assumed to be exact at high energies but hidden in the regime explored so far. The naturalness of this assumption is explored with emphasis on the possible explanation of the difference in the observed mixing patterns in the lepton and quark sectors.
        Intervenant: Dr. Rodrigo Alonso (UCSD)
        Documents: Slides pdf file summary unknown type filedown arrow pdf file
      • 11:00 Recent Borexino results and prospects for the near future 15'
        The Borexino experiment located in the Gran Sasso National Laboratory, is an organic liquid scintillator detector concieved for the real time spectroscopy of low energy solar neutrinos. The data taking campaign phase I (2007 - 2010) has allowed the first independent measurements of  7Be and pep solar neutrino fluxes as well as the first measurement of anti-neutrinos from the earth. After a purification of teh scintillator Borexino is now in phase II since 2011. We review here the recent results achieved during 2013, concerning the seasonal modulation in the 7Be signal, new limits on rare processes, the study of cosmogenic backgrounds and the upgraded measurement of geo-neutrinos. We also review the upcoming measurements on low energy solar neutrino components (pp, pep, CNO) and the new project SOX devoted to the study of sterile neutrinos via the use of a 51Cr neutrino and a 144Ce antienutrino sources placed in close proximity of the active material.
        Intervenant: Dr. Davide D'Angelo (Universita' degli Studi di Milano)
        Documents: Paper pdf file Slides pdf file
      • 11:20 Recent results from Daya Bay 15'
        Intervenant: Zhe Wang (Tsinghua University, Beijing)
        Documents: Slides pdf file
    • 17:00 - 19:30 Neutrino experiments
      Monday March 17th : Neutrino experiments
      • 17:00 The GERDA Experiment and the Search for Neutrinoless Double Beta Decay 15'
        Solid evidence for non-zero neutrino masses has been established by oscillation experiments but their absolute scale remains unknown. The neutrino mass can be composed of Dirac and Majorana mass terms. A Majorana mass term would result in total lepton number violation and have fundamental implications for cosmology. The only feasible experimental approach to investigate the Majorana nature of neutrinos is neutrinoless double beta decay (0νββ). The rate of the 0νββ decay is connected with the effective neutrino mass and aids in the determination of the absolute neutrino mass scale.
        The Gerda experiment (GERmanium Detector Array) investigates 0νββ in 76Ge and
        is among the leading experiments that aim to probe the degenerated mass hierarchy. The experiment is planned in two phases; the data taking of Phase I ended last summer after ≈ 21 kg · yr exposure with a background level of 2e−2 cts/(kg · yr · keV) before pulse shape discrimination. A lower 0νββ half-life limit T1/2 > 2.1e25 yr was established. The transition to Phase II with major upgrades and additional target mass is currently ongoing. The goal for Phase II is a background level of 1e−3 cts/(kg · yr · keV). With an exposure of 100 kg · yr a final sensitivity up to 2e26 yr half-life can be expected.
        This talk will introduce the Gerda experiment with a focus on the recent results of Phase I data along with their implications with respect to the controversial claim of 0νββ observation by a subgroup of the Heidelberg-Moscow experiment.
        Intervenant: Mr. Bjoern Lehnert (TU-Dresden)
        Documents: Paper pdf file Slides pdf file
      • 17:20 Neutrino-nucleus cross section measurements at MINERvA 15'
        An accurate and precise understanding of neutrino-nucleus interactions in the few-GeV energy region is vital for the success of the worldwide neutrino oscillation programme. In this talk, I will show measurements of neutrino cross sections taken at the MINERvA experiment which constrain interaction channels that are relevant for oscillation experiments.
        Intervenant: Dr. Philip Rodrigues (University of Rochester)
        Documents: Paper pdf file Slides pdf file
      • 17:40 Status of sterile neutrinos and neutrino anomalies 25'
        In this talk we will discuss neutrino oscillations involving eV-scale neutrino mass states, in the context of global neutrino oscillation data including short and long-baseline accelerator, reactor, and radioactive source experiments, as well as atmospheric and solar neutrinos. We consider sterile neutrino mass schemes involving one or two mass-squared differences at the eV^2 scale denoted by 3+1, 3+2, and 1+3+1. We discuss the hints for eV-scale neutrinos from nu_e disappearance (reactor and Gallium anomalies) and nu_mu -> nu_e appearance (LSND and MiniBooNE) searches, and we present constraints on sterile neutrino mixing from nu_mu and neutral-current disappearance data.
        Intervenant: Dr. Michele Maltoni (Instituto de Física Teórica UAM/CSIC)
        Documents: Slides pdf file
      • 18:10 Results and status from KamLAND-Zen 15'
        KamLAND-Zen is an experiment of search for neutrinoless double beta decay with KamLAND Detector,
        in Kamioka mine, Japan.
        We achieved the most stringent limit on neutrinoless double beta decay of Xe-136,
        and the purification for background reduction has been processed in the last year and a half.
        I report the results and current status from KamLAND-Zen.
        Intervenant: Dr. Hisataka YOSHIDA (RCNS, Tohoku University)
        Documents: Slides pdf file
      • 18:30 Tea or Coffee break 15'
      • 18:50 Status of the CUOREand CUORE-0 experiments at Gran Sasso 15'
        Intervenant: Fabio Bellini (Universita di Roma Sapienza and INFN Rome)
        Documents: Slides pdf file
      • 19:10 Search for Neutrinoless Double-β Decay of 100Mo and latest Double-β decay measurements using the final NEMO-3 dataset 15'
        The NEMO-3 detector, installed in the Modane underground laboratory, ran between February 2003 and January 2011. The NEMO-3 experiment employed a tracker and calorimeter detector technology to fully reconstruct the topology of the events generated in thin foils of active material. Thanks to its unique design, NEMO-3 studied the details of the Double-β decay in seven isotopes (100Mo, 82Se, 116Cd, 150Nd, 96Zr, 48Ca and 130Te). We searched for neutrinoless Double-β (0νββ) decay of 100Mo, the largest sample of NEMO-3, using the complete set of collected data. With an exposure of 34.7 kg·y, no evidence for the 0νββ signal has been found, yielding the best limit for the light Majorana neutrino mass,  mechanism in this isotope. Taking into account nuclear model uncertainties this result is in the same sensitivity range as recently reported constraints for the isotopes of 136Xe and 76Ge.  The same dataset is used to constrain other lepton number violating mechanisms of  the 0νββ decay. In particular the most stringent constraints so far have been obtained for right-left symmetric and SUSY models. We describe this measurement together with the latest results obtained with all other isotopes. 
        Intervenant: Dr. Stefano Torre (University College London)
        Documents: Slides pdf file
    • 19:30 - 20:30 Young Scientist Forum: YSF1
      Young Scientist Forum
      • 19:30 Forward-Backward Asymmetry of b quarks in B‐>J/psi K decays at DZero 5'
        I present an analysis of the forward-backward asymmetry A_FB in the B --> J/psi K decay channel at the DZero experiment. This asymmetry reflects the probability for b-bbar pairs to be produced without directional bias. We use the tools of DZero flavor physics analyses to measure this asymmetry in charged B decays. The charged B --> J/psi K process is not affected by neutral B meson mixing, and regular magnet polarity changes allow for cancellation of many first-order detector effects.
        A_FB is extracted from a maximum likelihood fit to the difference between forward and backward B+/- mass distributions, using a boosted decision tree to reduce background. Corrections are made for reconstruction asymmetries of the decay products. In this blinded trial A_FB is consistent with zero, with a statistical uncertainty of 0.3%.
        Intervenant: Mrs. Julie Hogan (Rice University)
        Documents: Paper unknown type file pdf file Slides pdf file
      • 19:38 Measurement of R = B (t → Wb) /B (t →Wq) in Top–quark–pair Decays using Dilepton Events and the Full CDF Run II Data set 5'
        We present a measurement of the ratio of the top-quark branching fraction $R
        = B (t -> Wb) /B (t -> Wq), where q represents quarks of type d, s or b, in the final state with two charged leptons, missing transverse energy and at least two jets. The measurement uses  sqrt{s} =1.96 TeV  proton-antiproton collision data collected with the Collider Detector at Fermilab during Run II, corresponding to an integrated luminosity of 8.7 fb^{-1}. We measure R=0.87 +- 0.07 (stat+syst) and extract the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element | V_{tb} | = 0.93 +- 0.04 (stat+syst) assuming three generations of quarks. Under the same assumption a lower limit on | V_{tb} | >  0.86 at 95% confidence level is set.
        Intervenant: Ms. Camilla Galloni (University of Zurich)
        Documents: Slides pdf file
      • 19:46 B-hadron lifetimes at LHCb 5'
        Intervenant: Thomas Nikodem (Physikalisches Institut, Heidelberg)
        Documents: Slides unknown type file pdf file
      • 19:54 Charmless B decays in LHCb 5'
        Searches for Lb and Xib decays to KSppi and KSpK decays at LHCb are reported.
        Intervenant: Mr. Rafael Silva Coutinho (University of Warwick (GB))
        Documents: Paper unknown type file pdf file Slides pdf file
      • 20:02 Low mass NP search of CP_odd Higgs A0 ‐ >ss,gg in BaBar 5'
        Search for a CP odd Higgs boson decaying to ss or gluon gluon at BaBar
        Intervenant: Ms. Elisa Guido (University and INFN Genova)
        Documents: Paper unknown type file pdf file Transparents pdf file
      • 20:10 Measurement of B->Xs gamma at Belle 5'
        Intervenant: Tomoyuki SAITO (Tohoku University)
        Documents: Paper unknown type file pdf file Slides pdf file
  • mardi 18 mars 2014
    • 08:30 - 12:20 Astrophysical neutrinos - Dark Matter
      Tuesday March 18th: Astrophysical neutrinos - Dark Matter
      • 08:30 The AMS-02 detector on the International Space Station 15'
        The AMS-02 detector is operating on the International Space Station
        (ISS) since May 2011. More than 45 billion events have been collected by
        the instrument in the first 1000 days of data taking. This unprecedented
        amount of data is being used to perform accurate measurements of the
        different Cosmic Rays components. In this contribution, the published
        results and the highlights of the on-going analyses will be presented.
        Intervenant: Dr. Matteo Duranti (INFN Sez. Perugia)
        Documents: Slides powerpoint file pdf file
      • 08:50 Recent Results from IceCube 15'
        The spectrum of cosmic rays includes the most energetic particles ever observed. The mechanism of their acceleration and their sources are, however, still mostly unknown. Observing astrophysical neutrinos can help solve this problem. Because neutrinos are produced in hadronic interactions and are neither absorbed nor deflected, they will point directly back to their source. Neutrinos may also be produced in other astrophysical processes, such as WIMP annihilation, and the detection of such particles would allow insight into these processes. This talk will cover searches for high-energy neutrinos (> 100 TeV) at the IceCube neutrino observatory, which have recently produced the first evidence for a flux beyond standard expectations from neutrinos generated in the Earth's atmosphere. This includes the detection of events with energies above 1 PeV -- the highest energy neutrinos ever observed. The current status of these astrophysical neutrino searches will be discussed. Additional focus will be given to searches for dark matter with IceCube.
        Intervenant: Dr. Claudio Kopper (University of Wisconsin--Madison, WIPAC)
        Documents: Paper unknown type file pdf file Slides pdf file
      • 09:10 PEV neutrinos from Ultra high energy cosmic rays 15'
        Intervenant: Günter Sigl (University of Hamburg)
        Documents: Slides pdf file
      • 09:30 Neutrinos probe supernova dynamics 15'
        Despite their extremely weak interactions, neutrinos are crucial to the dynamics of the most spectacular events in our galaxy: the deaths of massive stars in violent supernova explosions. In the delayed explosion scenario of core-collapse supernovae, neutrinos play a fundamental role reviving the explosion and carry imprints of the supernova hydrodynamics. Neutrino signal variations from first three-dimensional hydrodynamical simulations as well as their detection perspectives will be discussed. I will also talk about perspectives on what we could learn from such a measurement concerning the physics in the  supernova core and the explosion mechanism.
        Intervenant: Dr. Irene Tamborra (GRAPPA Institute, University of Amsterdam)
        Documents: Slides pdf file
      • 09:50 Tea or Coffee break 15'
      • 10:10 First results from the LUX Dark Matter Experiment 15'
        The discovery of the nature of the dark matter is presently one of the greatest challenges in fundamental physics. One favored class of dark matter candidates, the Weakly Interacting Massive Particles (WIMPs), are expected to interact with ordinary matter. LUX is one of the experiments that aim to detect nuclear recoils of energies of several keV resulting from the interaction of galatic WIMPs at a rate of less than 1 event/kg/year. For that, it employs a double-phase (liquid/gas) time projection chamber with 370 kg of mass, operating in the Davis Cavern of the Sanford Underground Laboratory, South Dakota USA.
        In this talk we will present the results from the first WIMP search run of LUX.  From a total exposure of 85 live-days, we found no evidence of signal above expected background, constraining scalar WIMP-nucleon interactions above 7.6x10-46 cm2 at 33 GeV/c2 WIMP mass (90% C.L.) - three times more sensitive than any competing experiment. The improvement in the sensitivity is more significant at low energies and seriously challenges the interpretation of hints of signal detected in other experiments as arising from low-mass WIMPs. This improvement in the current limits was achieved due the large mass of the detector and the high efficiency of detection of scintillation photons, the latter  enabling to  decrease the  energy threshold for nuclear recoils to 3 keV.
         LUX is preparing a new dark-matter search run that will last around one year and will improve significantly the current limits. We are also planning a multi-tonne successor to LUX: the LZ experiment. This instrument will have sensitivity ideally matched to explore the bulk of the remaining theoretically favoured electroweak phase space for galactic Dark Matter discovery.
        Intervenant: Dr. Cláudio Silva (LIP Coimbra)
        Documents: Slides pdf file
      • 10:30 Light Neutralino Dark Matter > 24 GeV from LHC data 15'
        We investigate the current status of the light neutralino dark matter scenario within the MSSM taking into account latest results from the LHC. A discussion of the relevant constraints, in particular from the dark matter relic abundance, leads us to a manageable simplified model defined by a subset of MSSM parameters. Within this simplified model we reinterpret a recent search for electroweak supersymmetric particle production based on a signature including multi-taus plus missing transverse momentum performed by the ATLAS collaboration. In this way we derive stringent constraints on the light neutralino parameter space. In combination with further experimental information from the LHC, in particular the bounds on possible invisible decays of the SM scalar, we obtain a lower bound on the lightest neutralino mass of about 24 GeV. This limit is stronger than any current limit set by underground direct dark matter searches or indirect detection experiments. With a mild improvement of the sensitivity of the multi-tau search, light neutralino dark matter can be fully tested up to about 30 GeV.
        Intervenant: Lorenzo Calibbi (ULB, Brussels)
        Documents: Paper unknown type file pdf file Slides pdf file
      • 10:50 Constraints on Light WIMPs with SuperCDMS 15'
        The SuperCDMS experiment has operated a 9kg array of cryogenic detectors to search for weakly interacting massive particles (WIMPs) in the Soudan Underground Lab since early 2012. We have recently analyzed 577 kg-d of low-energy data on a subset of detectors with 1.6 keVnr energy threshold. The athermal phonon measurement of the detectors provides position sensitivity, and therefore signal/background discrimination, near the energy threshold of the experiment. Using boosted decision trees and background simulations to optimize our sensitivity to light WIMPs, we set an upper limit on the WIMP-nucleon cross section of 1.2e-42 cm2 at 90% CL. This talk will present the results of this low-energy analysis in the context of other recent CDMS results using CDMSlite and CDMSII-Si data.
        Intervenant: Mr. Adam Anderson (Massachusetts Institute of Technology)
        Documents: Slides pdf file
      • 11:10 Dark Matter, Baryogenesis and Neutrino Oscillations from Right Handed Neutrinos 15'
        I discuss the possibility that right handed neutrinos with experimentally accessible masses alone can simultaneously explain neutrino oscillations, the baryon asymmetry of the universe and Dark Matter. Since these are the only confirmed pieces of evidence for particle physics beyond the Standard Model, this testable scenario can in principle be valid as a complete effective field theory of particle physics up to the Planck scale. The predictions for decaying right handed neutrino Dark Matter are in excellent agreement with the recent tentative evidence for a 3.5keV emission line, while the heavier right handed neutrinos responsible for baryogenesis can be searched for in the next run of the LHC.
        Intervenant: Dr. Marco Drewes (TU Munich)
        Documents: Slides pdf file
    • 17:00 - 19:30 Astrophysical neutrinos - Dark Matter
      Tuesday March 18th: Astrophysical neutrinos - Dark Matter
      • 17:00 Axions and Axion-like particles 25'
        Intervenant: Andreas Ringwald (DESY Hamburg)
        Documents: Slides pdf file
      • 17:30 Latest results of CAST and future prospects 15'
        The status of the solar axion search with the CERN Axion Solar Telescope (CAST) will be discussed. The latest results from the second part of CAST phase II where the magnet bores were filled with 3He gas at variable pressure scanning axion masses up to 1.2 eV will be presented. In 2013 CAST has improved its sensitivity to solar axions with rest mass below 0.02 eV/c2 by upgrading the Micromegas detectors and it will continue in 2014 with the implementation of a second X-ray optic and a new type of detector (InGRID). In addition, CAST has extended its sensitivity into the sub-keV energy range using a silicon detector (SDD), to search for solar chameleons. Thus, CAST also became sensitive to dark energy particles. A description of the upgrades will be given together with preliminary results on the chameleons search. A new generation axion helioscope (IAXO) aims to improve the current axion-photon coupling  by 1-1.5 order of magnitudes. This will be possible by building a dedicated magnet and dedicated optics and X-ray detectors.
        Intervenant: Dr. Theodoros Vafeiadis (CERN)
        Documents: Slides pdf file
      • 17:50 The Status of the PICO Dark Matter Experiment 15'
        This talk will present the current status of the PICO dark matter experimental program. PICO arose from the recent merger of the PICASSO and COUPP collaborations. They are currently operating two superheated liquid bubble chambers, PICO-2L and COUPP-60 at SNOLAB. The most recent results on the performance of these two detectors will be presented.
        Intervenant: Prof. Anthony Noble (Queen's University Kingston)
        Documents: Slides pdf file
      • 18:10 Tea or Coffee break 15'
      • 18:30 Scattering rates and spectator effects in leptogenesis 15'
        In recent years tremendous progress was made in a rigorous treatment of leptogenesis, using methods from non equilibrium and thermal quantum field theory. I will review some of the recent developments, like new results for scattering rates and effects from partially equilibrated spectator processes, and explain why they can have a substantial impact on the final baryon asymmetry. Finally I will comment on possible implications for neutrino masses and model building.
        Intervenant: Dr. Pedro Schwaller (CERN)
        Documents: Paper unknown type file pdf file Transparents pdf file
      • 18:50 Analysis of 3.4 years of CoGeNT Data 15'
        The CoGeNT dark matter detector has been taking data at the Soudan mine since December 2009.  The data have been analyzed for a possible WIMP signal using multi-dimensional PDFs in energy, time, and pulse rise-time.  The bulk event (fast rise-time pulses) and surface (slow rise-time) event fractions are determined through this analysis.  We have also done extensive simulations of backgrounds for the CoGeNT detector, and these backgrounds are compared to the CoGeNT data.  The current plans for the next generation detector, C4, are also outlined.   We will detail specific improvements in background reduction and energy resolution.  Finally, our results are compared to other experiments in the context of low-mass dark matter.
        Intervenant: Dr. Marek Kos (Pacific Northwest National Laboratory)
        Documents: Slides powerpoint file
    • 19:30 - 20:30 Young Scientist Forum 2: YSF2
      • 19:30 Neutrinos from active galactic nuclei to Icecube 5'
        we calculate the column densities of radio galaxies by considering new Icecube signals
        Intervenant: Mr. Isaac Saba (Theorretische Physik IV Bochum, Germany)
        Documents: Transparents pdf file
      • 19:38 Probing the mass hierarchy in reactor neutrino oscillations 5'
        One of the most promising method to probe neutrino mass hierarchy is studying medium-baseline reactor neutrino oscillations. The requirements are huge statistics, high energy resolution, precision calculations and refined statistical analyses of event spectra. In such a context, we consider essential to take into account the following ingredients:  nucleon recoil in inverse beta decay and its impact on energy reconstruction and resolution, hierarchy and matter effects in the oscillation probability, spread of reactor distances, irreducible backgrounds from geoneutrinos and from far reactors, and degeneracies between energy scale and spectrum shape uncertainties. We also introduce a continuous parameter α, which interpolates smoothly between normal hierarchy (α = +1) and inverted hierarchy (α = −1). The determination of the hierarchy is then transformed from a test of hypothesis to a parameter estimation, with a sensitivity given by the distance of the true case (either α = +1 or α = −1) from the “undecidable” case (α = 0). Our numerical simulations show that for the specific set up envisaged for the JUNO project there is a sensitivity of  about 2σ to mass hierarchy, which, however, will decrease significantly if energy scale and spectrum shape systematics are not under control.
        Intervenant: Dr. Francesco Capozzi (INFN Bari - Università degli studi di Bari)
        Documents: Paper unknown type file Slides pdf file
      • 19:46 First measurements with the KATRIN spectrometer and detector section 5'
        The next generation large-scale tritium beta-decay experiment KATRIN (Karlsruhe Tritium Neutrino experiment) is designed to determine the effective mass of the electron-antineutrino with a sensitivity of 200 meV (90% C.L.). It is currently being assembled at the Karlsruhe Institute of Technology, with a planned start of tritium operation in 2016. The talk covers an introduction to the working principle of KATRIN as well as an insight into the first measurements with the combined spectrometer and detector section, focusing on the topic of radon-induced background processes.
        Intervenant: Dr. Nancy Wandkowsky (Karlsruhe Institute of Technology (KIT))
        Documents: Slides pdf file
      • 19:54 Search for Dark Matter with Liquid Argon and Pulse Shape Discrimination: Results from DEAP-1 and status of DEAP-3600. 5'
        In the last decade, Direct Dark Matter search has become a very active research program, spawning dozen of projects world wide and leading to contradictory results. It is on this stage that the DEAP detector is about to enter. With a 3600kg liquid Argon target and a 1000kg fiducial mass, it is designed to run background free during 3 years, reaching an unprecedented sensitivity of 10-46 cm2 for a WIMP mass of 100 GeV. In order to achieve this impressing feat, the collaboration followed a two-pronged approach: a careful selection of every material entering the construction of the detector in order to suppress the backgrounds, and optimum use of the pulse shape discrimination (PSD) technique to separate the nuclear recoils from the electronic recoils.
        Using the experience acquired with the 7kg-prototype DEAP-1, whose results will be presented during this talk, a 3600 kg detector is being completed at SNOLAB (Sudbury, CANADA) and is expected to start taking data mid-2014.
        Intervenant: Dr. Pierre Gorel (University of Alberta)
        Documents: Paper unknown type file pdf file Slides pdf file
      • 20:02 Lepton Flavor Violation with dimension 6 operators 5'
        I will talk about Lepton Flavor violation in the extension of the Standard Model with gauge invariant operators of dimension-6.I will discuss 3-body charged lepton decays and decay of Z boson to lepton pair and then comparing the obtained analytical expression with the current experimental results. Finally, I will discuss the numerical bounds on the magnetic of the so-called Wilson coefficient, parameterizing the allowed size of new physics effects.
        Intervenant: Saereh Najjari (University of Warsaw)
        Documents: Slides pdf file
      • 20:10 Search for Non-Standard Interactions by atmospheric neutrino 5'
        It is known that neutral current Non-Standard Interactions (NSI) in
        propagation cause additional matter effect for neutrinos and that large
        NSI, which is comparable in strength to those in the Standard Model, can be
        consistent with the existing data.  We investigate the effects of NSI in
        propagation to atmospheric neutrino experiments such as Super-Kamiokande
        and Hyper-Kamiokande.  With the ansatz where the parameters which have
        strong constraints from other experiments are neglected, we show how these
        experiments put constraints on the remaining parameters of the Non-Standard
        Intervenant: Mr. Shinya FUKASAWA (Tokyo Metropolitan University)
        Documents: Slides pdf file
  • mercredi 19 mars 2014
    • 08:30 - 12:05 Standard Model Physics & Cosmology
      Wednesday March 19th: Standard Model Physics  & Cosmology  
      • 08:30 Review of Electric Dipole Moments (EDMs) 20'
        Electric dipole moments are sensitive to CP violation in physics beyond the standard model, since they are accidentally suppressed in the standard model. In this talk, I will review the current experimental bounds on  EDMs, theoretical evaluation of the EDMs, first. I will also discuss the sensitivities to physics around and above TeV scale.
        Intervenant: Prof. Junji Hisano (Nagoya university)
        Documents: Slides pdf file
      • 08:55 Tevatron measurement on Z boson asymmetry 15'
        Intervenant: Breese Quinn (University of Mississippi)
        Documents: Paper unknown type file Slides pdf file
      • 09:15 Other SM measurements: Boson + jets and diboson production at ATLAS and CMS 15'
        Recent standard model results from CMS and ATLAS are reviewed.
        Intervenant: Lindsey Gray (Fermi National Accelerator Laboratory)
        Documents: Transparents pdf file
      • 09:35 Tevatron Top Quark Mass Measurement 15'
        The discovery of the top quark in 1995 has been one of the great successes of the CDF and D0 experiments at the Tevatron collider.
        Since then, both collaborations have measured the properties of the
        top quark in many channels and using different methods.
        The importance of measuring its mass lies in the possibility
        of verifying the predictions and the consistency of the Standard Model as well as in setting constraints on possible, still unobserved physics.
        The most precise measurement is still coming from the last Tevatron
        combination (March 2013), using data samples corresponding to integrated luminosities up to 8.7 fb-1: 
        Mtop = 173.20 +- 0.51(stat) +- 0.71(syst) GeV.
        In this talk a selected review of the most recent or relevant results obtained by the CDF and D0 Collaborations is presented, with updates not included in the combination.
        Intervenant: Luca Brigliadori (University of Bologna)
        Documents: Paper unknown type file pdf file Slides pdf file
      • 09:55 Tevatron t-tbar asymmetry 15'
        A_{FB}s in t-tbar production at the Tevatron
        Intervenant: Amnon Harel (University of Rochester)
        Documents: Slides pdf filedown arrow
      • 10:15 Tea or Coffee break 15'
      • 10:35 Top quark: Production at ATLAS and CMS 15'
        A review of the main recent results on top quark production from the ATLAS and CMS experiments is presented. Results on both electroweak single top quark production and strong top pair production are presented.
        Intervenant: Dr. Luca Lista (INFN - Naples)
        Documents: Slides pdf file
      • 10:55 Measurement of the Z boson production via vector-boson fusion in ATLAS 15'
        Intervenant: Andrew Pilkington (University College London)
        Documents: Slides pdf file
      • 11:15 Tevatron single top 15'
        The latest results on the measurements of electroweak top-quark production at the Tevatron are presented with the full RunII dataset. The CDF and D0 Collaborations have performed measurements of the s-channel, t-channel and s+t cross sections in both l+jets and MET+jets final states and have extracted the CMK matrix element |Vtb|.
        Intervenant: Reinhard Schwienhorst (Michigan State University)
        Documents: Paper unknown type file pdf file Slides pdf file
    • 17:00 - 20:10 Standard Model Physics & Cosmology
      Wednesday March 19th: Standard Model Physics  & Cosmology  
      • 17:00 Measurement of the top quark mass and properties at the LHC 15'
        The latest measurements of the top quark and properties by the ATLAS and CMS experiments will be presented.
        Intervenant: Dr. Nuno Castro (LIP)
        Documents: Paper link unknown type file Transparents pdf file
      • 17:20 Constraints on pdf's and alpha_s measurement at LHC 20'
        Intervenant: Dr. Mark Sutton (The University of Sussex)
        Documents: Slides pdf file
      • 17:45 Planck 2013 cosmological results 15'
        The Planck collaboration released last year CMB temperature anisotropies observations from data taken during the nominal duration of the mission.
        From high resolution sky maps in 9 frequency bands, we derived constraints on parameters of the Lambda-CMD model and its extensions. This talk will give an overview of the main  results presented, and prospects for improvements with the 2014 Planck data release.
        Intervenant: Dr. olivier perdereau (Laboratoire de l'Accelerateur Lineaire)
        Documents: Slides pdf file
      • 18:05 Tea or Coffee break 15'
      • 18:25 Introduction to BICEP2 B modes results 10'
        This short presentation was prepared on the spot to introduce to the audience the recent results from Bicep2, which were made public 2 days before this talk and in which the author has had no part (and hence should not get credit from !), and their context.
        Intervenant: Dr. olivier perdereau (Laboratoire de l'Accelerateur Lineaire)
        Documents: Slides pdf file
      • 18:40 Inflation after Planck 15'
        Intervenant: Jan Hamann (CERN)
        Documents: Slides pdf file
      • 19:00 Neutrinos properties from Cosmology 25'
        Intervenant: Yvonne Wong (The University of New South Wales)
        Documents: Slides pdf file
      • 19:30 Gravitino LSP and Leptogenesis after the first LHC results 15'
        Supersymmetric scenarios where the lightest superparticle (LSP) is the gravitino are an attractive alternative to the widely studied case of a neutralino LSP. A strong motivation for a gravitino LSP arises from the possibility of achieving higher reheating temperatures and thus potentially allow for thermal leptogenesis. The predictions for the primordial abundances of light elements in the presence of a late decaying next-to-LSP (NSLP) as well as the currently measured dark matter abundance allow us to probe the cosmological viability of such a scenario. Here we consider a gravitino-stau scenario. Utilizing a pMSSM scan we work out the implications of the 7 and 8 TeV LHC results as well as other experimental and theoretical constraints on the highest reheating temperatures that are cosmologically allowed. Our analysis shows that points with T_R>10^9 GeV survive only in a very particular corner of the SUSY parameter space. Those spectra feature a distinct signature at colliders that could be looked at in the upcoming LHC run.
        Intervenant: Dr. Jan Heisig (RWTH Aachen University)
        Documents: Paper unknown type file Slides pdf file
      • 19:50 Quantum Einstein gravity meets ATLAS & CMS 15'
        We explain how ATLAS & CMS data constrain the fundamental parameters of quantum Einstein gravity with extra dimensions. We exploit constraints from unitarity and make predictions for gravitational Drell-Yan production, graviton emission, and mini-black hole production. When combined with LHC data, our findings lead to new bounds on the fundamental Planck scale, which are weakener than those obtained by effective theory.
        Intervenant: Dr. Daniel Litim (University of Sussex)
        Documents: Slides pdf file
  • jeudi 20 mars 2014
    • 08:30 - 12:00 Physics of the Scalar Boson
      Thursday March 20th: Physics of the Scalar Boson
      • 08:30 Tevatron measurements on SM Higgs 15'
        We present the study of the SM Higgs properties obtained from the combined analysis of the up-to 10 fb-1 dataset collected by the CDF and D0 experiments during the ppbar collision at 1.96 TeV center-of-mass energy of Tevatron Run II. The observed local significance for the SM Higgs boson signal is of 3.0 sigma at mH=125 GeV. After a brief review of analysis channels  contributing the most, where the Higgs boson decays to a pair of W bosons or to a pair of b-quarks jets, the signal production cross section and its coupling to fermions and vector bosons are analyzed. Other presented results are the recent study of the spin and parity of the SM Higgs performed by the D0 collaboration, leading to 3 sigma level exclusion of the JP=0- and JP=2+ hypothesis, and the investigation of exotics final states with invisible decay products of the Higgs, excluded by the CDF collaboration for masses below 120 GeV.
        Intervenant: Dr. Sforza Federico (CDF)
        Documents: Paper pdf file Transparents pdf file
      • 08:50 Where could beyond SM physics hide in the Scalar sector? 20'
        Intervenant: Mr. Alex Pomarol (Barcelona Univ. Spain)
        Documents: Slides pdf file
      • 09:15 Analysis of the ttH channels 15'
        Intervenant: Cristina Botta (CERN)
        Documents: Slides unknown type file pdf file
      • 09:35 Hot topic talk from ATLAS 15'
        Intervenant: Eve Le Menedeu (IFAE (Barcelona) Institut de Física d'Altes Energies)
        Documents: Transparents pdf file
      • 09:55 Tea or Coffee break 15'
      • 10:15 Hot topic talk from CMS: Higgs width 15'
        Constraints on Higgs-boson total width using H*(126) --> ZZ events
        Intervenant: Roberto Covarelli (University of Rochester)
        Documents: Proceedings unknown type file pdf file Slides pdf file
      • 10:35 Measurement of SM Higgs couplings to fermions and bosons 15'
        Intervenant: Eilam Gross (Weizmann Institute)
        Documents: Slides pdf file
      • 10:55 Measurement of the Higgs properties (spin, mass, width, ..) 15'
        Intervenant: Pasquale Musella (CERN)
        Documents: Slides pdf file
      • 11:15 The universal scalar fit 15'
        I present global fits to all available (pre-Moriond) scalar boson data from the LHC and Tevatron. The result implies metastable Standard Model scalar potential with a global minimum above the Planck scale with the statistical  significance at 3 sigma level. I discuss implications of the BEH boson properties for our understanding of physics beyond the Standard Model.
        Intervenant: Dr. Martti Raidal (NICPB)
        Documents: Slides pdf file
    • 17:00 - 18:30 Physics of the Scalar Boson
      Thursday March 20th: Physics of the Scalar Boson
      • 17:20 BSM Higgs boson searches 15'
        Intervenant: Dr. Paul Thompson (University of Birmingham)
        Documents: Slides pdf file
      • 17:40 Scale invariance and the Higgs mass 15'
        Intervenant: Prof. martin schmaltz (boston university)
        Documents: Slides pdf file
      • 18:00 Tea or Coffee break 15'
      • 18:15 One extra complex singlet = stability+DM+Inflaton 15'
        I show that the most minimal completion of the Standard Model with stable
        vacuum is obtained by extending it with one complex singlet scalar. The model contains a stable Dark Matter candidate due to CP conservation without imposing additional discrete symmetries, and may accommodate inflation at the same time.
        Intervenant: Dr. Kristjan Kannike (NICPB, Estonia)
        Documents: Slides pdf file
    • 18:30 - 19:10 Young Scientist Forum 3: ysf3
      • 18:30 UHE neutrinos and Z'/W' 5'
        A wide range of models beyond the Standard Model predict charged and neutral resonances, generically called W′- and Z′-bosons, respectively. During this talk I will present our study on the impact of such resonances on the deep inelastic scattering of ultra-high energy neutrinos as well as on the resonant charged current ν¯ee− scattering (Glashow resonance). We find that the effects of such resonances can not be observed with the Pierre Auger Observatory or any foreseeable upgrade of it.
        Intervenant: Mr. Florian Lyonnet (LPSC)
        Documents: Paper pdf file Slides pdf file
      • 18:38 Model-independent analysis of scenarios with heavy vector-like top partners 5'
        While a fourth generation of quarks is now strongly disfavored from the LHC results, many New Physics models predict the existence of new Vector-Like quarks as smoking gun signatures. Searches for new fermionic states heavier than the top quark are being pursued by the CMS & ATLAS collaborations, pushing the mass bounds towards the TeV scale. 
        In this talk, I will review the phenomenology of new heavy vector-like top partners, assuming generic couplings to the Standard Model quarks. A model-independent and general framework to study their peculiar signatures from both pair and single production will be presented, in terms of few parameters with a clear and simple connection with experimental observables.
        Finally, I will present a reinterpretation of the existing bounds for non-minimal scenarios with general branching ratio assumptions and multiple vector-like quarks, and discuss new search strategies for the forthcoming searches at the LHC.
        Intervenant: Mr. Mathieu Buchkremer (Universite catholique de Louvain)
        Documents: Paper unknown type file Transparents pdf file
      • 18:46 The New Muon g-2 Experiment at Fermilab 5'
        The measurement of the anomalous magnetic moment of the muon provides a test of the standard model and a handle on physics beyond the standard model. There is currently a three sigma discrepancy between theory and experiment. With 20 times the statistics and a factor of four improvement in the systematic errors, a new experiment at Fermilab aims to resolve this difference. I will present the current status of the experiment and show results from recent beam tests of the calorimeter and the tracker.
        Intervenant: Mandy Rominsky (Fermilab)
        Documents: Slides pdf file
      • 18:54 Gamma lines and cosmic continuum from DM decay 5'
        We show that there exists only a quite limited number of higher dimensional operators which can naturally lead to a slow decay of dark matter particles into monochromatic photons. As each of these operators inevitably induces decays into particles other than photons, we show that the gamma-lines it induces are always accompanied by a continuum flux of cosmic rays. Hence constraints on cosmic-ray fluxes imply constraints on the intensity of gamma-lines and vice-versa. A comparison with up to date observational bounds shows the possibilities to observe or exclude cosmic rays associated to gamma-line emission, so that one could better determine the properties of the DM particle, possibly discriminating between some of the operators.
        Intervenant: Tiziana Scarna (ULB)
        Documents: Paper unknown type file pdf filedown arrow Transparents pdf file
  • vendredi 21 mars 2014
    • 08:30 - 12:00 Beyond the Standard Model
      Friday March 21th: Beyond the Standard Model
      • 08:30 Strong SUSY production searches in LHC 20'
        Intervenant: Dr. Pedrame Bargassa (Lip Lisbon)
        Documents: Slides pdf filedown arrow
      • 08:55 NMSSM and natural scalars 15'
        In the motivated hypothesis that the scalar bosons of the next-to-minimal supersymmetric Standard Model (NMSSM) be the lightest new particles around, we outline a possible overall strategy to search for signs of the extra CP-even states. 
        In a generic NMSSM which minimises the fine-tuning of the electroweak scale, we show how the measurements of the couplings of the 126 GeV boson constrain the region of the physical parameters; we also determine the cross section for the production of a CP-even scalar, together with its total width and its most relevant branching ratios.
        Intervenant: Dr. Dario Buttazzo (Institute for Advanced Study - TUM, Munich)
        Documents: Slides pdf file
      • 09:15 EW SUSY production searches at ATLAS and CMS 15'
        The discovery of weak-scale supersymmetric (SUSY) particles is one of the primary goals of the Large Hadron Collider experiments. Depending on the mechanism of SUSY breaking, it could be that strongly interacting squarks and gluinos are too massive to produce at the LHC. In this case, the primary SUSY production mode is of charginos, neutralinos and sleptons, mediated by electroweak interactions. However, the experimental signatures for discovery vary widely, depending on the mass hierarchy, SUSY particle mixing parameters and conservation/violation of R-parity, necessitating a large and complex suite of experimental search strategies. These strategies include searching for events with multiple charged leptons, photons, reconstructed higgs bosons or new long-lived particles. In this presentation, the latest ATLAS and CMS search results in these channels are presented, based mainly on 20 fb$^{-1}$ of pp collisions at $\sqrt{s} = 8$ TeV collected in 2012. The resulting constraints on the parameter spaces of various SUSY models are shown.
        Intervenant: Dr. Michael Flowerdew (Max-Planck-Institut für Physik, München)
        Documents: Paper unknown type file pdf file Transparents pdf file
      • 09:35 Multilepton and Multiphoton signatures of SUSY at the LHC 15'
        Motivated by the absence of any clear signal of physics beyond the Standard Model (SM) at the LHC after Run 1, I will discuss one slight (but tantalizing) hint of new physics and one non-minimal extension of the SM. In the first part of the talk I will do the exercise of explaining a small excess of multilepton events recently observed by the CMS collaboration by means of a simplified model of gauge mediated supersymmetry breaking (GMSB). In the second part of the talk I will discuss how the standard phenomenology of GMSB can be significantly modified by the non-minimal assumption that supersymmetry is broken in more than one hidden sector. Multiple hidden sectors give rise to light neutral fermions called pseudo-goldstini and due to the extra decay steps they give rise to, where soft photons are emitted, these models give rise to multiphoton plus missing energy signatures. I will compare against existing LHC searches and propose new searches designed to probe these models.
        Intervenant: Mr. Christoffer Petersson (ULB, Brussels)
        Documents: Slides pdf file
      • 09:55 Tea or Coffee break 15'
      • 10:15 Impact of TeV-scale sterile neutrinos on precision low-energy observables 15'
        We study the impact of TeV-scale sterile neutrinos on electro-weak precision observables and lepton number and flavour violating decays in the framework of a type-I see-saw extension of the Standard Model. At tree level sterile neutrinos manifest themselves via non-unitarity of the PMNS matrix and at one-loop level they modify the oblique radiative corrections. We derive explicit formulae for the S,T,U parameters in terms of the neutrino masses and mixings and perform a numerical fit to the electro-weak observables. We find regions of parameter space with a sizable active-sterile mixing which provide a better over-all fit compared to the case where the mixing is negligible. Specifically we find improvements of the invisible Z-decay width, the charged-to-neutral-current ratio for neutrino scattering experiments and of the deviation of the W boson mass from the theoretical expectation.
        Intervenant: Dr. Alexander Kartavtsev (Max-Planck Institut für Physik)
        Documents: Paper unknown type filedown arrow pdf filedown arrow Slides pdf file
      • 10:35 Dark Matter searches in LHC 15'
        Multiple cosmological observations indicate the existence of Dark Matter, which may be a weakly interacting massive particle (WIMP). In this case, Dark Matter could be produced in proton-proton collisions at the LHC, but would escape the detector without interacting. Final states consisting in pair-produced Dark Matter candidates would however be balanced by radiated particles from colliding partons. ATLAS and CMS experiments can therefore search for Dark Matter signal in events involving large amount of missing transverse energy in the detector. Analyses have been carried out in the context of the mono-jet, mono-photon, mono-W and mono-Z signatures, including both hadronic and leptonic W and Z decays. No evidence of physics beyond the Standard Model expectation has been observed, and the pair production of Dark Matter particles has been interpreted in the context of an effective field theory and simplified models. Limits on the suppression scale of the effective theory have been translated into bounds on the WIMP-nucleon scattering and WIMP annihilation cross sections. Results were derived from datasets of collisions at a center-of-mass energy of 7 and 8TeV, with an integrated luminosity of up to 20/fb.
        Intervenant: Philippe Calfayan (LMU Munich)
        Documents: Proceedings unknown type file Transparents pdf file
      • 10:55 Lepton flavour violating Higgs decays 15'
        In the inverse seesaw, the smallness of the neutrino mass is related to the smallness of a lepton number violating mass term while the seesaw scale is naturally close to the TeV. This allows for large effects in lepton flavour and universality violating observables as was previously demonstrated. With the ongoing and planned measurements of the Higgs boson properties at the LHC, we found timely to investigate the possibility of having large lepton flavour violating branching ratios in Higgs decays. In this presentation, we will discuss our results on the lepton flavour violating Higgs decay rates and their implication for the inverse seesaw.
        Intervenant: Dr. Cedric Weiland (IFT UAM/CSIC)
        Documents: Transparents pdf file
      • 11:15 Enhanced diphoton signal of a light singlet-like scalar in NMSSM 15'
        NMSSM with a light singlet-like scalar and strongly suppressed couplings to b and τ is investigated. It is shown that in such a scenario the singlet-like scalar to diphoton signal can be larger than for the SM Higgs for a wide range of masses between 60 and 110 GeV, in agreement with all the LEP and LHC data. Enhancement of the singlet-like scalar to diphoton signal is correlated with positive correction to the SM-like Higgs mass from mixing between SM-like Higgs and the singlet. It is also shown that the couplings to b and τ and, in consequence, branching ratios of the SM-like Higgs are anti-correlated with those of the singlet-like scalar. If the singlet-like scalar to diphoton signal is enhanced, the signal strengths of the 125 GeV Higgs in the diphoton and WW∗/ZZ∗ channels are predicted to be smaller than for the SM Higgs.
        Intervenant: Mr. Marcin Badziak (University of Warsaw)
        Documents: Slides pdf file
    • 17:00 - 19:30 Beyond the Standard Model
      Friday March 21th: Beyond the Standard Model
      • 17:00 Is the Standard Model scalar the first discovered SUSY particle? 15'
        The scalar particle recently discovered at the LHC has the same gauge quantum numbers as the neutrino, so they could be one the superpartner of the other. In this talk I will discuss such a possibility, discussing a model where this is indeed realised. This model has an interesting phenomenology at the LHC.
        Intervenant: Mrs. Carla Biggio (Università di Genova)
        Documents: Slides pdf file
      • 17:20 BSM Physics: Boosted object searches at ATLAS and CMS 15'
        Several models of physics beyond the Standard Model predict new heavy particles that can decay to boosted W,Z,H or top, that is, with a transverse momentum that considerably exceeds their rest mass. This is a new kinematic regime where classical reconstruction approach relying on one-to-one jet to parton assignment is not adequate anymore. New techniques for the reconstruction of such objects at the LHC have been recently developed and succesfully applied to analyses based on the Run I data at 8TeV allowing to extend the sensitivity of BSM searches. These new reconstruction approaches are now even more crucial for the incoming Run II at 13 TeV.
        Intervenant: Dr. Patrizia Azzi (INFN)
        Documents: Slides unknown type filedown arrow pdf file
      • 17:40 Limits on the Electron EDM and EDMs in Two-Higgs-Doublet Models 15'
        Intervenant: Dr. Martin Jung (TU Dortmund)
        Documents: Slides pdf file
      • 18:00 Exotic Searches in LHC 15'
        Some of the newest results of searches from Physics Beyond the Standard Model in the Large Hadron Collider are presented, both from the ATLAS and CMS Collaborations. Model-independent searches, Excited Fermions, Vector-like Quarks and Leptoquark searches are discussed.
        Intervenant: Mr. Thiago Rafael Tomei Fernandez (UNESP)
        Documents: Paper unknown type file pdf file Slides pdf file
      • 18:20 Tea or Coffee break 15'
      • 18:40 New physics and surprises in B->D(D*)taunu 15'
        Intervenant: Dr. Andrey Tayduganov (Osaka University)
        Documents: Transparents pdf file
    • 19:30 - 20:42 Young Scientist Forum 4: YSF4
      • 19:30 Search for direct stop pair production in OS dileptons ATLAS 5'
        Intervenant: Federico Meloni (INFN Milano)
        Documents: Slides pdf file
      • 19:38 High SUSY scale and a few-parameter description of the scalar sector 5'
        We analyze the Minimal Supersymmetric extension of the Standard Model that we have after the discovery of the Higgs boson at the LHC, i.e. a model in which the lighter h boson has a mass of approximately 125 GeV which, together with the non-observation of superparticles at the LHC, indicates that the SUSY-breaking scale MS is rather high. We first demonstrate that the value Mh≈125 GeV fixes the dominant radiative corrections that enter the MSSM Higgs boson masses, leading to a Higgs sector that can be described, to a good approximation, by only two free parameters. In a second step, we consider the direct supersymmetric radiative corrections and show that, to a good approximation, the phenomenology of the lighter Higgs state can be described by its mass and three couplings : those to massive gauge bosons and to top and bottom quarks. We perform a fit of these couplings using the latest LHC data on the production and decay rates of the light h boson and combine it with the limits from the negative search of the heavier H,A and H± states.
        Intervenant: Jérémie Quevillon (LPT)
        Documents: Transparents pdf file
      • 19:46 Evidence for Higgs boson decays to a pair of tau leptons 5'
        After the discovery of a Higgs boson in the  $\gamma\gamma$, $ZZ^{*}$ and $WW^{*}$ final states in 2012, the search for leptonic decay modes plays a crucial role in the identification of this particle as the Standard Model Higgs boson. Tau leptons, as the heaviest charged leptons do contribute significantly to the decay width of a SM Higgs boson of mass $m_H = 125.5$ GeV. 
        Recent results on the search for Higgs boson decays to the $\tau\tau$ final state with the ATLAS detector are presented based on $21 fb^{-1}$ proton-proton collision data collected at $\sqrt{s}=8$ TeV. 
        To effectively suppress the high rate $Z\rightarrow \tau\tau$ background, the analysis exploits the distinct event topology of Higgs bosons produced via Vector-Boson-Fusion.
        Based on multivariate classifiers the analysis offers a significant increase in sensitivity compared to results presented previously.
        Intervenant: Mr. Nils Ruthmann (Universitaet Freiburg)
        Documents: Slides pdf file summary unknown type file pdf file
      • 19:54 Measurements of the Electron Reconstruction and Identification Efficiencies in ATLAS 5'
        Isolated, high-energy electrons constitute a very clean signature at hadron collider experiments. As the final states of many Standard Model processes, as well as physics beyond the Standard Model, electrons are a vital part of the ATLAS physics program. A precise knowledge of the efficiency to correctly reconstruct and identify these electrons is thus important. In this contribution the measurement of these efficiencies is described. It is performed with a tag-and-probe method using Z and J/psi decays to electrons in 20.3 ifb of pp collisions recorded in 2012 at sqrt(s)=8 TeV. The combination of the measurements results in identification efficiencies determined with an accuracy of a few per mil for electrons with a transverse energy of Et>30 GeV.
        Intervenant: Mr. Philip Sommer (Albert-Ludwigs-Universität Freiburg)
        Documents: Paper unknown type file pdf file Slides pdf file
      • 20:02 Window on new physics via the scaling of SM effective operators 5'
        We study deformations of the SM via higher dimensional operators. Focusing on bosonic operators relevant for electroweak and scalar boson physics, we compute their one-loop RG scaling equations. Assuming absence of tuning or correlations, these allow us to derive RG-induced bounds, stronger than the direct constraints, on some SM scalar boson couplings and anomalous triple gauge couplings. Any future experimental evidence of violation of these bounds would suggest a particular pattern of correlations among the Wilson coefficients, thus offering a new window on the new physics sector.
        Intervenant: Mr. David Marzocca (SISSA)
        Documents: Paper unknown type file pdf file Slides pdf file
      • 20:10 Measurement of VZ production XS in Vbb decay channels in CMS 5'
        Intervenant: Caterina Vernieri (Scuola Normale Superiore, Pisa)
        Documents: Slides pdf file
      • 20:18 Search for a heavy Higgs boson in the H->ZZ->2l2nu channel in pp collisions at sqrt(s) = 7 and 8 TeV at CMS experiment. 5'
        A search for a heavy Higgs boson in the H->ZZ->2l2nu decay channel, where l = e or μ, in pp collisions at a center-of-mass energy of both 7 and 8 TeV is presented. The search is optimised separately for the vector boson fusion and the gluon fusion production processes. No significant excess is observed above the background expectation. A re-interpretation of the results as a search for an electroweak singlet extension of the Standard Model is also presented.
        Intervenant: Mr. Arun Kumar (University of Delhi, India)
        Documents: Slides pdf file
      • 20:26 Evidence of the SM Higgs Boson in the Decay Channel into Tau Leptons 5'
        A search for the standard model Higgs boson decaying into a pair of tau leptons is performed using events recorded by the CMS experiment at the LHC in 2011 and 2012. The dataset corresponds to an integrated luminosity of 4.9/fb at a centre-of-mass energy of 7 TeV and 19.7/fb at 8 TeV. An excess of events is observed over the expected background contributions, with a local significance larger than 3 standard deviations for mH values between 110 and 130 GeV.
        Intervenant: Riccardo Manzoni (INFN Milano Bicocca)
        Documents: Slides pdf file proceedings pdf file proceedings archive unknown type file
      • 20:34 Status of the two-Higgs-doublet model of type II 5'
        After the Higgs boson discovery at the LHC one of the main questions is whether the Standard Model Higgs sector is really minimal. A very popular extension of the Standard Model is the two-Higgs-doublet model of type II (2HDM). In a global analysis of this model large parts of the parameter space can be excluded by taking into account LHC Higgs search results, electroweak precision observables and certain flavour observables. We present the latest status of 2HDM fits with a special emphasis on the future measurement of triple Higgs couplings, which could be used to distinguish between the Standard Model and the 2HDM.
        Intervenant: M. Otto Eberhardt (INFN)
        Documents: Slides pdf file summary unknown type file pdf file
  • samedi 22 mars 2014
    • 09:00 - 11:30 Summaries
      • 09:00 Theory Summary 45'
        Intervenant: Jean Iliopoulos (Ecole Normal Superieure Paris)
        Documents: Slides pdf file summary unknown type file pdf file
      • 09:50 Experimental Summary 45'
        Intervenant: Kevin Einsweiler (Lawrence Berkeley Lab)
        Documents: Slides pdf file