0000000000056386

AUTHOR

Q.j. Liu

showing 2 related works from this author

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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Observation of Λc+→nKS0π+

2017

We report the first direct measurement of decays of the Lambda(+)(c) baryon involving the neutron. The analysis is performed using 567 pb(-1) of e(+)e(-) collision data collected at root s = 4.599 GeV with the BESIII detector at the BEPCII collider. We observe the decay Lambda(+)(c) -> nK(S)(0)pi(+) and measure the absolute branching fraction to be B(Lambda(+)(c) -> nK(S)(0)pi(+)) = [1.82 +/- 0.23(stat) +/- 0.11(syst)]%. A comparison to B[Lambda(+)(c) -> p( (K) over bar pi)(0)] provides an important test of isospin symmetry and final state interactions.

PhysicsParticle physics010308 nuclear & particles physicsBranching fractionElectron–positron annihilationAnalytical chemistryGeneral Physics and AstronomyLambda01 natural sciencesBaryonCharmed baryonsIsospin0103 physical sciencesPiHigh Energy Physics::ExperimentNeutronNuclear Experiment010306 general physicsPhysical Review Letters
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