Search results for "BEPCII"

showing 5 items of 5 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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Measurement of cross sections of the interactions e+e−→ ϕϕω and e+e−→ ϕϕϕ at center-of-mass energies from 4.008 to 4.600 GeV

2017

Abstract Using data samples collected with the BESIII detector at the BEPCII collider at six center-of-mass energies between 4.008 and 4.600 GeV, we observe the processes e + e − → ϕ ϕ ω and e + e − → ϕ ϕ ϕ . The Born cross sections are measured and the ratio of the cross sections σ ( e + e − → ϕ ϕ ω ) / σ ( e + e − → ϕ ϕ ϕ ) is estimated to be 1.75 ± 0.22 ± 0.19 averaged over six energy points, where the first uncertainty is statistical and the second is systematic. The results represent first measurements of these interactions.

Nuclear and High Energy PhysicsBESIII детекторe+e- annihilationElectron–positron annihilation01 natural sciencesNOlaw.inventionNuclear physicsCross section (physics)law0103 physical sciencesCross section; e+e−annihilation; Triple quarkonia; Nuclear and High Energy Physics010306 general physicsColliderTriple quarkoniaPhysicsAnnihilationCross section010308 nuclear & particles physicse+e−annihilatione+e− annihilationlcsh:QC1-999BEPCII коллайдерe+e? annihilationCenter of massCross section; e+e- annihilation; Triple quarkonia; Nuclear and High Energy Physicslcsh:Physics
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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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Measurement of e+ e- → DD cross sections at the ψ(3770) resonance

2018

Chinese physics / C High energy physics and nuclear physics C 42(8), 083001 (2018). doi:10.1088/1674-1137/42/8/083001

Particle physicsNuclear and High Energy PhysicsMesoncharm mesonsElectron–positron annihilation01 natural sciencesResonance (particle physics)530BESIII/BEPCIIlaw.inventionHigh Energy Physics - ExperimentNOlaw0103 physical sciencesddc:530010306 general physicsColliderInstrumentationDECAY LIBRARY TAUOLAPhysicsLuminosity (scattering theory)Annihilation010308 nuclear & particles physicsSigmacross sectionsAstronomy and AstrophysicsBESIII/BEPCII; charm mesons; cross sections; Nuclear and High Energy Physics; Instrumentation; Astronomy and AstrophysicsHigh Energy Physics::ExperimentBar (unit)
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Measurement of the branching fraction for ψ(3770) → γχc0

2016

Kolcu, Onur Buğra (Arel Author) --- Makale 70 yazarlıdır.

PhysicsNuclear and High Energy PhysicsParticle physicsBESIII детектор010308 nuclear & particles physicsBranching fractionElectron–positron annihilationMonte Carlo methodDetectorCollision01 natural scienceslcsh:QC1-999NOData setNuclear physicsBEPCII коллайдер0103 physical sciences010306 general physicslcsh:Physics
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