Rencontre de Physique des Particules 2010

25 janv. 2010, 13:50 → 27 janv. 2010, 17:00 Europe/Paris

Amphi Dirac (IPN Lyon)

Aldo Deandrea (IPNL), Sacha Davidson (IPNL)

L'édition 2010 de la Rencontre de Physique des Particules aura lieu du lundi 25 janvier à 14h00 au mercredi 27 janvier à 17h00 à l'Institut de Physique Nucléaire de Lyon. Les participants, particulièrement les jeunes, sont invités à présenter leurs travaux lors d'exposés de vingt minutes. Nous vous invitons donc à vous inscrire sur le site, en indiquant notamment le titre et le résumé de votre contribution, avant le 10 janvier. Nous prévoyons également un certain nombre d'exposés de revue ainsi qu'une table ronde sur les perspectives de notre discipline. The participants are invited to give 20 minute presentations of their work (in the language of their choice). People wishing to speak should indicate the title and abstract of their presentation when they register. Preference will be given to postdocs and students, and to those who register prior to January 10th. Some reviews on topics of recent interest, and a general discussion of the perspectives of the field are also planned. Grace à l'IN2P3 et à l'IPNL, nous disposons d'une petite somme d'argent pour financer les jeunes à la RPP. Si vous avez besoin d'aide financiere, SVP envoyer un mel à rpp2010@ipnl.in2p3.fr (support, à gauche). Some money is available to subsidise young people to attend the meeting. Please contact rpp2010@ipnl.in2p3.fr if you would like financial assistance. We thank the IN2P3 and the IPNL for this support. Comité local X. Artru, G. Cacciapaglia, S. Davidson, A. Deandrea, F. Gieres Comité scientifique D. Becirevic (LPT Orsay) G. Bélanger (LAPTH Annecy) J. Charles (CPT Marseille) A. Deandrea (IPN Lyon) C. Deffayet (APC Paris) A. Djouadi (LPT Orsay) E. Dudas (CPhT Palaiseau) P. Fayet (LPTENS Paris) B. Fuks (IPHC Strasbourg) Th. Gousset (Subatech Nantes) M. Klasen (LPSC Grenoble) G. Moultaka (LPTA Montpellier) J. Orloff (LPC Clermont-Ferrand) G. Salam (LPTHE Jussieu) G. Servant (IPhT Saclay) C. Volpe (IPN Orsay)

Slides Konstandin.pdf

lundi 25 janvier

1 Bienvenue

2 LHC Physics prospects (Exp.)

Orateur: Dr Silvano Tosi (CNRS/IPNL)

Slides tosi_rpp.pdf

3 Study on MSSM models with effective operators

In this talk I will discuss some implications of higher order operators (dimension 5 and 6) on the MSSM spectrum. In particular I will state how the effective parameters appearing in those operators are constrained by current measurements, and how we can use the allowed range of those parameters to vary the masses in the Higgs, neutralinos and charginos sectors.

Orateur: M. Guillaume Drieu La Rochelle (LAPTH)

Paper drieu_RPP_2010.pdf

Slides drieu_RPP_2010.ppsx

4 Impact of squark generation mixing on the search for superpartners at the LHC

In supersymmetric models beyond minimal flavour-violation, generation-mixing terms in the squark or slepton sector can be sizeable. These off-diagonal entries of the corresponding mass matrices affect both the production and subsequent decay of SUSY particles at colliders. I will discuss scenarios that agree with the relevant experimental constraints and where the branching fractions of squarks into charm- and top-quarks are simultaneously large. I will the present recent results on the production of squarks and discuss possibly interesting signatures at the LHC.

Orateur: Björn Herrmann (Universität Würzburg)

Slides Talk_Herrmann.pdf

5 Hidden Higgs

I will talk about a class of models where the light Higgs boson, 100 GeV or less, is consistent with all existing LEP constraints. Recent ideas along that direction include models where Higgs decays into four light hadronic jets, or into lepton jets. I will discuss the possibility to study this scenario at the LHC

Orateur: M. Adam Falkowski (CERN)

Slides Lyon_100125.pdf

15:45 coffee break

6 Associated production of charged Higgs and top at LHC: the role of the complete electroweak supersymmetric contribution

Orateur: Dr Luca Panizzi (IPNL)

Slides RPPLyon20100125-Panizzi.pdf

7 Hypercharge Anomaly-Mediated Supersymmetry Breaking at the LHC

I will discuss the phenomenological consequences of Hypercharge Anomaly-Mediated Supersymmetry Breaking at the LHC. This string-inspired model combines a U(1) form of mediation with anomaly mediation to provide a viable pattern of MSSM masses and interesting signatures at the LHC.

Orateur: M. Shibi Rajagopalan (University of Oklahoma)

Slides hcamsb.pdf

8 Gravity waves from cosmological first-order phase transitions

First-order phase transitions proceed by nucleation and expansion of bubbles filled with a new phase of the medium. An example in particle physics is given by the transition in the early Universe from unbroken to broken electroweak gauge symmetry. At the end of the phase transition the expanding bubbles collide and partially release their energy into gravitational wave radiation. I will focus on two aspects of this process: 1) The energy budget using hydrodynamic considerations. 2) The spectrum of the gravity waves given by geometric considerations and computer simulations.

Orateur: M. Thomas Konstandin (CERN)

Slides Konstandin.pdf

9 The MSSM with GUT-scale degenerate Higgs masses

An interesting class of UV completions of the MSSM gives rise to a specific structure of the Higgs mass matrix. Namely, in such models the diagonal and off-diagonal Higgs mass parameters are degenerate at the GUT scale. We explain the origins of this structure from higher dimensions, and we discuss some examples. We also present a numerical study of the phenomenological prospects of such models: By imposing Higgs mass degeneracy as a GUT-scale boundary condition for the RG evolution of the MSSM parameters, we can confront the emerging low-energy phenomenology with present experimental constraints.

Orateur: Dr Felix Bruemmer (IPPP Durham)

Slides ly10.pdf

mardi 26 janvier

10 Gravitino Dark matter and BBN

Supersymmetry is an elegant extension of the standard model that presents many interesting features such as interesting candidates for dark matter. I will focus on the case of a stable gravitino as the lightest supersymmetric particle (LSP). Models with a gravitino LSP can also solve the lithium problems linked to big bang nucelosynthesis (BBN). Predicted abundances in the standard description of BBN are incompatible with observations. If the decay of the next to lightest supersymmetric particle into the gravitino occurs during BBN, the lithium problems can be solved.

Orateur: M. Sean Bailly (LAPTH)

Slides Bailly_RPP.pdf

11 A Dark Matter candidate from Lorentz Invariance in 6 Dimensions

I will present the unique 6 dimensional orbifold with chiral fermions where a stable dark matter candidate is present due to Lorentz invariance on the orbifold, with no additional discrete symmetries imposed by hand. We propose a model of Universal Extra Dimensions where a scalar photon of few hundred GeV is a good candidate for dark matter. The spectrum of the model is characteristic of the geometry, and it has clear distinctive features for the LHC phenomenology compared to previous models of Kaluza-Klein dark matter.

Orateur: M. Jérémie Llodra-Perez (IPNL)

Slides talk_llodra_RPP.pdf

12 One-loop relic density with gauge pair production

With the increasing accuracy of forthcoming experiments (like PLANCK), on the theoretical side a high level of precision is also needed, therefore cross sections need to be evaluated at least at NLO. This has been applied to the calculation of the relic density of dark matter with gauge boson pair production with the help of the automatic program SloopS.

Orateur: M. Guillaume Chalons (LAPTH)

Slides RPP10chalons.pdf

13 SUSY GUTs with Yukawa Unification in the light of data

After a short overview of the hypothesis of Yukawa Unification within SUSY GUTs, I report on its viability in the light of the predictions for quark masses, EW precision data and FCNC processes. In particular, I discuss the phenomenological difficulties existing when universalities for the soft SUSY-breaking terms at the GUT scale are assumed, and how these difficulties can be overcome in simple and robustly motivated scenarios of non-universalities. Finally, I discuss the falsifiability of the latter scenarios at forthcoming experiments, primarily the LHC.

Orateur: Dr Diego Guadagnoli (TU Munich)

Slides Talk_guadagnoli.pdf.pdf

10:20 Coffee break

14 Direct detection review (Edelweiss, CDMS, Xenon)

15 A stable dark matter candidate and grand unification without supersymmetry

Orateur: Dr Michele Frigerio (SPhT, CEA-Saclay)

Slides FrigerioRPP2010.pdf.pdf

16 Dark matter in cosmic ray electrons and positrons

1 year after the "PAMELA buzz", I will make a status on the search for dark matter signatures in cosmic ray spectra, focusing on electrons and positrons.

Orateur: Dr Julien Lavalle (University of Torino)

12:15 déjeuner

17 Gravitational waves from cosmological phase transitions

Cosmology is to some extent a search for 'relics' of earlier phases of the Universe. A famous example of this is the is the cosmic microwave background. Another observational signature which would allow us to probe even earlier epochs of the Universe is a background of gravitational waves. In my talk I discuss the characteristics of the gravitational wave background we might expect from a first order phase transition in the early Universe and I outline the prospects of its observation.

Orateur: Prof. Ruth Durrer (Université de Genève)

Slides gws.pdf

18 Constraining dark matter scenarios with CMB

I will show how it is possible to use CMB observables to put constraints in different types of DM parameter space. In the case of self-annihilating DM the constraints are particularly strong, competitive with local, multimessenger ones. This method offers the advantage to get rid of astrophysical uncertainties and rely only on cosmological quantities and might have interesting consequences on our understanding of high redshift Universe as well.

Orateur: Dr Fabio Iocco (IAP - IPhT, CEA/Saclay)

Slides Iocco-Rpp.ppt.ppt

19 Neutrino mass hierarchy in the double seesaw model

Orateur: Dr Carla Biggio (Max Planck Institut fur Physik, Munich)

Slides rpp10.pdf

20 Minimal SUSY Inverse Seesaw

Orateur: Dr Albert Villanova del Moral (LPTA Montpellier)

Slides avm.pdf

15:45 coffee break

21 Turbulence and Supernova Neutrinos

It has long been feared that the presence of turbulence in supernovae would erase the characteristic features in the neutrino signal of the next Galactic supernova that would have allowed us to determine fundamental properties of the neutrino and observe the explosion while it is still deep in the star. We examine the effect of turbulence upon the neutrinos and find that the damage to the signal is not as great as feared and that turbulence might also leave its own characteristic fingerprints in unexpected places.

Orateur: Dr James KNELLER (IPNO)

Slides Kneller.pdf

22 Direct Photon Production In Association With A Heavy Quark Jet at Hadron and Ion Colliders

The associated production of direct photons and heavy quarks probes the gluon and heavy quark PDFs. As such this process can be used to constrain those nPDFs and to distinguish between different nPDFs sets. Predictions for hadron and ion colliders (ALICE, RHIC) are shown.

Orateur: Dr Tzvetalina Stavreva (Florida State University/LPSC)

Slides PhotQ_TS.pdf

23 Table ronde

19:30 diner

mercredi 27 janvier

24 Lepton flavour violation

Flavour violating processes are indirect probes of physics beyond the Standard Model, and are complementary to direct collider searches. In this talk, I will discuss lepton flavour violation in supersymmetric models, focusing on the possibility of disentangling various high-energy scenarios through correlations between different processes.

Orateur: Dr Stéphane Lavignac (SPhT Saclay)

Slides RPP_Lyon.pdf

25 CP violation beyond the MSSM

Orateur: Dr Cédric Delaunay (Weizmann Institute of Science)

Slides rpp2010-delaunay.pdf

26 Le régime de saturation de QCD mis en évidence à RHIC avec les nouvelles données d+Au

Orateur: Dr Cyrille Marquet (IPhT - CEA/Saclay)

Slides marquet.ppt

10:25 coffee break

27 Monopoles, Anomalies, and Electroweak Symmetry Breaking

I discuss how to formulate a low-energy theory of chiral monopoles and how monopoles can give rise to electroweak symmetry breaking and a sufficiently large top quark mass.

Orateur: Prof. John Terning (UC Davis/CERN)

Slides terning.pdf.pdf

28 Inflation from Phase Transitions in Scalar-Tensor theories

Inflation with tunneling from a false to a true vacuum is viable in the presence of a non-minimally coupled scalar field. As a by-product this field also sets dynamically the value of the Planck mass, which can be exponentially large. Therefore along with Inflation we also suggest a natural dynamical explanation for why gravity is so weak today. Moreover we predict a spectrum of gravity waves peaked at around 0.1 mHz, that will be detectable by the planned space inteferometer LISA and we discuss interesting predictions on cosmological scalar and tensor fluctuations in the CMB. Finally we discuss possible ways of making the additional scalar compatible with late-time constraints.

Orateur: Dr Alessio Notari (University of Heidelberg)

Slides NotaritalkLyon.pdf

29 NLO corrections to ee->gt;WWZ and ee->gt;ZZZ

Orateur: M. Hao Sun (LAPTH)

Slides rPP10-sunhao.pdf.pdf

12:20 déjeuner

30 Decoherence and thermalization in quantum field theory

Orateur: Julien Serreau (APC, University Paris 7)

Slides RPP2010-Serreau.pdf

31 La dualité AdS/CFT et le secteur scalaire de QCD

Les fonctions de corrélation des opérateurs associés aux boules de glu et aux mésons scalaires sont étudiées dans le cadre de la correspondance AdS/CFT. En particulier, les masses, les constantes de désintégration aussi bien que des constantes de couplage et des valeurs de condensats sont calculées et comparées avec leurs estimations dans QCD.

Orateur: Dr Frédéric Jugeau (IHEP)

Paper jugeau_rpp2010.pdf

32 Etude du contenu mésonique des protons via les processus exclusifs durs vers l'arrière

Je discuterai les possibilités offertes par l'étude de processus exclusifs durs dans le régime arrière, tels que, d'une part, la diffusion Compton profondément virtuelle et l'électroproduction de méson à JLAB et COMPASS, et, d'autre part, la production d'une paire dilepton-meson dans des annihilations proton-antiprotons à GSI-FAIR.

Orateur: Dr Jean-Philippe Lansberg (Ecole Polytechnique- CPHT)

Slides RPP2010_270110.pdf

33 Introduction du degré de liberté de spin dans les jets de quark

Les modèles actuels de fragmentation de quark ne tiennent pas compte du degré de liberté de spin. Or celui-ci influe sur les distributions azymutales (effet Collins et jet-handedness) et même sur le pT carré moyen. Nous présenterons un modèle ultra-simplifié où le spin est pris en compte tout au long de la cascade de fragmentation.

Orateur: Dr Xavier Artru (IPNL)

Slides Artru-RPP2010.pdf

34 Distributions inclusives des particles dans les jets dans le vide et dans le milieu

Orateur: Dr Redamy Perez (Universitat de Valencia IFIC-SCIC)

Slides rpp2010.pdf