Measurement of the Absolute Branching Fraction for Λ_c⁺ → Λe⁺ν_e

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dc.contributor.Scopus56366505900 (Lou, X)en_US
dc.contributor.authorAblikim, M.en_US
dc.contributor.authorAchasov, M. N.en_US
dc.contributor.authorAi, X. C.en_US
dc.contributor.authorAlbayrak, O.en_US
dc.contributor.authorAlbrecht, M.en_US
dc.contributor.authorAmbrose, D. J.en_US
dc.contributor.authorAmoroso, A.en_US
dc.contributor.authorLou, Xinchouen_US
dc.contributor.authorBESIII Collaborationen_US
dc.contributor.utdAuthorLou, Xinchouen_US
dc.date.accessioned2016-07-01T14:33:13Z
dc.date.available2016-07-01T14:33:13Z
dc.date.created2015-11-25en_US
dc.date.issued2015-11-25en_US
dc.description.abstractWe report the first measurement of the absolute branching fraction for Λ_c⁺. This measurement is based on 567 pb⁻¹ of e⁺e⁻ annihilation data produced at √s = 4.599 GeV, which is just above the Λ_c⁺ Λ̅_c̅ threshold. The data were collected with the BESIII detector at the BEPCII storage rings. The branching fraction is determined to be ℬ(Λ_c⁺ → Λe⁺ν_e) = [3.63 ± 0.38(stat) ± 0.20(syst)]%, representing a significant improvement in precision over the current indirect determination. As the branching fraction for Λ_c⁺ → Λe⁺ν_e is the benchmark for those of other Λ_c⁺ semileptonic channels, our result provides a unique test of different theoretical models, which is the most stringent to date.en_US
dc.description.sponsorshipThis work is supported in part by National Key Basic Research Program of China under Contract No. 2015CB856700; National Natural Science Foundation of China (NSFC) under Contracts No. 11125525, No. 11235011, No. 11275266, No. 11322544, No. 11322544, No. 11335008, No. 11425524, and No. 11505010; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; the CAS Center for Excellence in Particle Physics (CCEPP); the Collaborative Innovation Center for Particles and Interactions (CICPI); Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No. 11179007, No. U1232201, and No. U1332201; CAS under Contracts No. KJCX2-YW-N29 and No. KJCX2-YW-N45; 100 Talents Program of CAS; National 1000 Talents Program of China; INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology; German Research Foundation DFG under Contract No. Collaborative Research Center CRC-1044; Istituto Nazionale di Fisica Nucleare, Italy; Koninklijke Nederlandse Akademie van Wetenschappen (KNAW) under Contract No. 530-4CDP03; Ministry of Development of Turkey under Contract No. DPT2006K-120470; Russian Foundation for Basic Research under Contract No. 14-07-91152; The Swedish Resarch Council; U. S. Department of Energy under Contracts No. DE-FG02-04ER41291, No. DE-FG02-05ER41374, No. DE-SC0012069, and No. DESC0010118; U.S. National Science Foundation; University of Groningen (RuG) and the Helmholtzzentrum fuer Schwerionenforschung GmbH (GSI), Darmstadt; and WCU Program of National Research Foundation of Korea under Contract No. R32-2008-000-10155-0.en_US
dc.identifier.bibliographicCitationAblikim, M., M. N. Achasov, X. C. Ai, O. Albayrak, et al. 2015. "Measurement of the Absolute Branching Fraction for Λ_c⁺ → Λe⁺ν_e." Physical Review Letters 115(22), doi: 10.1103/PhysRevLett.115.221805.en_US
dc.identifier.issn0031-9007en_US
dc.identifier.issue22en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/4853
dc.identifier.volume115en_US
dc.language.isoenen_US
dc.publisherAmer Physical Socen_US
dc.relation.urihttp://dx.doi.org/10.1103/PhysRevLett.115.221805
dc.rights©2015 American Physical Societyen_US
dc.sourcePhysical Review Letters
dc.subjectSemileptonic decaysen_US
dc.subjectBaryonsen_US
dc.subjectQuarksen_US
dc.subjectAnnihilation reactionsen_US
dc.subjectBranching fractions (Nuclear physics)en_US
dc.subjectLambda baryonsen_US
dc.titleMeasurement of the Absolute Branching Fraction for Λ_c⁺ → Λe⁺ν_een_US
dc.type.genrearticleen_US

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