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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.date.accessioned2018-05-24T18:18:20Z
dc.date.available2018-05-24T18:18:20Z
dc.date.created2017en_US
dc.date.issued2017en_US
dc.identifier.issn0031-9007en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/5762
dc.description.abstractUsing 4.479 x 10⁸ ψ(3686) events collected with the BESIII detector, we search for the decays ψ(3686)→ e⁺e⁻χ_{cJ} and χ_{cJ} → e⁺e⁻J/ψ, where J=0, 1, 2. The decays ψ(3686) → e⁺e⁻χ_{cJ} and χ_{cJ} → e⁺e⁻J/ψ are observed for the first time. The measured branching fractions are ℬ(ψ(3686) → e⁺e⁻χ_{cJ}) = (11.7 ± 2.5 ± 1.0) × 10⁻⁴, (8.6 ± 0.3 ± 0.6) × 10⁻⁴, (6.9 ± 0.5 ± 0.6) × 10⁻⁴ for J=0, 1, 2, and ℬ(χ_{cJ} → e⁺e⁻J/ψ) = (1.51 ± 0.30 ± 0.13) × 10⁻⁴, (3.73 ± 0.09 ± 0.25) × 10⁻³, (2.48 ± 0.08 ± 0.16) × 10⁻³ for J=0, 1, 2, respectively. The ratios of the branching fractions ℬ(ψ(3686)→ e+e-χ_{cJ}) / ℬ(ψ(3686) → γχ_{cJ}) and ℬ(χ_{cJ} → e⁺e⁻J/ψ) / ℬ(χ_{cJ} → γJ/ψ) are also reported. Also, the α values of helicity angular distributions of the e⁺e⁻ pair are determined for ψ(3686) → e⁺e⁻χ_{c1,2} and χ_{c1,2} → e⁺e⁻J/ψ.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. 11322544, No. 11335008, No. 11425524, No. 11521505, and No. 11575198; 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; German Research Foundation DFG under Contracts No. Collaborative Research Center CRC-1044, No. FOR 2359; 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; U.S. Department of Energy under Contracts No. DE-FG02-05ER41374, No. DE-SC-0010504, No. DE-SC0012069, and No. DESC0010118; U.S. National Science Foundation; WCU Program of National Research Foundation of Korea under Contract No. R32-2008-000-10155-0.en_US
dc.language.isoenen_US
dc.publisherAmerican Physical Societyen_US
dc.relation.urihttp://dx.doi.org/10.1103/PhysRevLett.118.221802
dc.rights©2017 American Physical Society.en_US
dc.sourcePhysical Review Letters
dc.subjectElectron-positron interactionsen_US
dc.subjectElectroweak interactionsen_US
dc.subjectMesonsen_US
dc.subjectElectronsen_US
dc.subjectBranching fractions (Nuclear physics)en_US
dc.subjectParticles (Nuclear physics)—Helicityen_US
dc.titleObservation of ψ(3686) → e⁺e⁻χ_{cJ} and χ_{cJ} → e⁺e⁻J/ψen_US
dc.type.genrearticleen_US
dc.description.departmentSchool of Natural Sciences and Mathematicsen_US
dc.identifier.bibliographicCitationAblikim, M., M. N. Achasov, X. C. Ai, O. Albayrak, et al. 2017. "Observation of ψ (3686) → e⁺e⁻χ_{cJ} and χ_{cJ} → e⁺e⁻J/ψ." Physical Review Letters 118(22), doi:10.1103/PhysRevLett.118.221802en_US
dc.identifier.volume118en_US
dc.identifier.issue22en_US
dc.contributor.utdAuthorLou, Xinchouen_US
dc.contributor.ORCID0000-0003-0867-2189 (Lou, X)en_US


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