0000000000423467

AUTHOR

P. H. Leruste

showing 3 related works from this author

Search for Production of Invisible Final States in Single-Photon Decays of Υ(1S)

2010

We search for single-photon decays of the Upsilon(1S) resonance, Upsilon->gamma+invisible, where the invisible state is either a particle of definite mass, such as a light Higgs boson A0, or a pair of dark matter particles, chi chi-bar. Both A0 and chi are assumed to have zero spin. We tag Upsilon(1S) decays with a dipion transition Upsilon(2S)->pi+pi-Upsilon(1S) and look for events with a single energetic photon and significant missing energy. We find no evidence for such processes in the mass range m_A0<=9.2 GeV and m_chi<=4.5 GeV in the sample of 98e6 Upsilon(2S) decays collected with the BaBar detector and set stringent limits on new physics models that contain light dark ma…

Particle physicsPhotonAstrophysics::High Energy Astrophysical PhenomenaPhysics beyond the Standard ModelElectron–positron annihilationDark matterFOS: Physical sciencesGeneral Physics and Astronomy01 natural sciencesResonance (particle physics)High Energy Physics - ExperimentNuclear physicsHigh Energy Physics - Experiment (hep-ex)PACS: 13.20.Gd 12.60.Jv 14.80.Da 95.35.+d0103 physical sciencessingle-photon decays of Upsilon(1S)[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]010306 general physicsLight dark matterPhysicsMissing energy010308 nuclear & particles physicsParticle physicsBABAR detectorHEPBaBarHiggs bosonHigh Energy Physics::ExperimentFísica de partículesExperimentsBaBar detector at SLAC
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Study of radiative bottomonium transitions using converted photons

2011

We use 111+/-1 million Upsilon(3S) and 89+/-1 million Upsilon(2S) events recorded by the BaBar detector at the PEP-II B-factory at SLAC to perform a study of radiative transitions between bottomonium states using photons that have been converted to e+e- pairs by the detector material. We observe Upsilon(3S) -> gamma chi_b0,2(1P) decay, make precise measurements of the branching fractions for chi_b1,2(1P,2P) -> gamma Upsilon(1S) and chi_b1,2(2P) -> gamma Upsilon(2S) decays, and search for radiative decay to the eta_b(1S) and eta_b(2S) states.

Nuclear and High Energy PhysicsParticle physicsMesonElectron–positron annihilationHadronbottomoniumFOS: Physical sciences01 natural sciencesHigh Energy Physics - ExperimentNuclear physicsHigh Energy Physics - Experiment (hep-ex)Particle decayBaBar detector at SLAC; radiative bottomonium transitions0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]Radiative transfer010306 general physicsPACS: 13.20.Gd 14.40.PqPhysics010308 nuclear & particles physicsBranching fractionParticle physicsQuarkoniumHEPconverted photons3. Good healthbottomonium; converted photonsPair productionradiative bottomonium transitionsBaBarBaBar detector at SLACFísica de partículesExperimentsPhysical Review D
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Study of high-multiplicity three-prong and five-prong τ decays at BABAR

2012

We present measurements of the branching fractions of three-prong and five-prong tau decay modes using a sample of 430 million tau lepton pairs, corresponding to an integrated luminosity of 468 fb(-1), collected with the BABAR detector at the PEP-II asymmetric-energy e_e storage rings at SLAC National Accelerator Laboratory. The tau(-) -> (3 pi)(-) eta nu(tau), tau(-) -> (3 pi)(-) omega nu(tau), and tau(-) f(1) (1285)nu(tau) branching fractions are presented, as well as a new limit on the branching fraction of the second-class current decay tau(-) -> pi(-) eta'(958)nu(tau). We search for the decay mode tau(-) -> K- eta'(958)nu(tau) and for five-prong decay modes with kaons, and place the fi…

Decays of taus; TausNuclear and High Energy PhysicsParticle physicsElectron–positron annihilationDecays of tausPACS: 13.35.Dx 14.60.FgHigh multiplicity01 natural sciencesTausNuclear physics0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]Decays of tau010306 general physicsCurrent decayPhysics010308 nuclear & particles physicsBranching fractionLeptons (Física nuclear)Particle physicsHEPLeptons (Nuclear physics)BaBarHigh Energy Physics::ExperimentExperimentsFísica de partículesLepton
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