0000000000423379

AUTHOR

K. Schubert

showing 2 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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First study of the CP-violating phase and decay-width difference in Bs0→ψ(2S)ϕ decays

2016

A time-dependent angular analysis of Bs0→ψ(2S)ϕ decays is performed using data recorded by the LHCb experiment. The data set corresponds to an integrated luminosity of 3.0fb−1 collected during Run 1 of the LHC. The CP-violating phase and decay-width difference of the Bs0 system are measured to be ϕs=0.23−0.28+0.29±0.02rad and ΔΓs=0.066−0.044+0.041±0.007ps−1, respectively, where the first uncertainty is statistical and the second systematic. This is the first time that ϕs and ΔΓs have been measured in a decay containing the ψ(2S) resonance.

PhysicsNuclear and High Energy PhysicsParticle physicsLarge Hadron ColliderLuminosity (scattering theory)010308 nuclear & particles physicsPhase (waves)Astrophysics01 natural sciencesResonance (particle physics)Angular distribution0103 physical sciencesCP violation010306 general physicsPhysics Letters B
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