Search results for " BESIII"

showing 3 items of 3 documents

Measurement of the absolute branching fraction for Λc+→Λμ+νμ

2017

Abstract We report the first measurement of the absolute branching fraction for Λ c + → Λ μ + ν μ . This measurement is based on a sample of e + e − annihilation data produced at a center-of-mass energy s = 4.6  GeV , collected with the BESIII detector at the BEPCII storage rings. The sample corresponds to an integrated luminosity of 567  pb − 1 . The branching fraction is determined to be B ( Λ c + → Λ μ + ν μ ) = ( 3.49 ± 0.46 ( stat ) ± 0.27 ( syst ) ) % . In addition, we calculate the ratio B ( Λ c + → Λ μ + ν μ ) / B ( Λ c + → Λ e + ν e ) to be 0.96 ± 0.16 ( stat ) ± 0.04 ( syst ) .

Nuclear and High Energy PhysicsBESIII детекторElectron–positron annihilationAnalytical chemistryAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciencesLuminosityNOлептоны0103 physical sciencesAbsolute branching fraction010306 general physicsNuclear ExperimentPhysicsAnnihilation010308 nuclear & particles physicsBranching fraction?c +Absolute branching fraction; BESIII; Semi-leptonic decay; Λc+; Nuclear and High Energy PhysicsBESIIIΛc+lcsh:QC1-999BaryonBEPCII коллайдерSemi-leptonic decayHigh Energy Physics::ExperimentAstrophysics::Earth and Planetary Astrophysicslcsh:Physics
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Measurements of the center-of-mass energies of e+e- collisions at BESIII

2021

Chinese physics / C 45(10), 103001 (2021). doi:10.1088/1674-1137/ac1575

Nuclear and High Energy PhysicsParticle physicsFOS: Physical sciences53001 natural sciencescenter-of-mass energy; e(+)e(-) annihilation; BESIIINO030218 nuclear medicine & medical imagingHigh Energy Physics - ExperimentSubatomär fysikHigh Energy Physics - Experiment (hep-ex)03 medical and health sciences0302 clinical medicineAstronomi astrofysik och kosmologi0103 physical sciencesSubatomic PhysicsAstronomy Astrophysics and Cosmologyddc:530Instrumentationcenter-of-mass energyPhysicscenter-of-mass energy e+e- annihilation BESIII010308 nuclear & particles physicsBESIIIE+e-annihilationAstronomy and Astrophysicse(+)e(-) annihilationannihilationExcited stateCenter of masscenter-of-mass energy e+e-
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Dark photon search in the mass range between 1.5 and 3.4 GeV/c2

2017

Physics letters / B 774, 252 - 257 (2017). doi:10.1016/j.physletb.2017.09.067

Particle physicsBESIII; Dark photon search; Initial state radiation; Nuclear and High Energy PhysicsNuclear and High Energy PhysicsPhotonBESIII детекторElectron–positron annihilationFOS: Physical sciences01 natural sciences530Dark photonVector bosonStandard ModelHigh Energy Physics - ExperimentNONuclear physicsHigh Energy Physics - Experiment (hep-ex)Dark photon search0103 physical sciencesInvariant massddc:530Dark photon search; Initial state radiation; BESIII010306 general physicsNuclear ExperimentPhysicsGauge boson010308 nuclear & particles physicsтемные фотоныBESIIIlcsh:QC1-999BEPCII коллайдерMass spectrumHigh Energy Physics::ExperimentInitial state radiationlcsh:PhysicsPhysics Letters B
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