Determination of the Spin and Parity of the Z_c (3900)

dc.contributor.ORCID0000-0003-0867-2189 (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.utdAuthorLou, Xinchouen_US
dc.date.accessioned2018-05-24T18:18:20Z
dc.date.available2018-05-24T18:18:20Z
dc.date.created2017en_US
dc.date.issued2017en_US
dc.description.abstractThe spin and parity of the Z_{c}(3900)^{±} state are determined to be J^{P} =1⁺ with a statistical significance larger than 7σ over other quantum numbers in a partial wave analysis of the process e⁺e⁻ → π⁺π⁻J/ψ. We use a data sample of 1.92 fb⁻¹ accumulated at √s̅=4.23 and 4.26 GeV with the BESIII experiment. When parametrizing the Z_{c}(3900)^{±} with a Flatté-like formula, we determine its pole mass M_{pole} = (3881.2 ± 4.2_{stat} ± 52.7_{syst}) MeV/c² and pole width Γ_{pole} = (51.8 ± 4.6_{stat} ± 36.0_{syst}) MeV. We also measure cross sections for the process e⁺e⁻→ Z_{c}(3900)^{±}π⁻ + c.c.→ J/ψπ⁺π⁻ and determine an upper limit at the 90% confidence level for the process e⁺e⁻→ Z_{c}(4020)^{±}π⁻ + c.c.→J/ψπ⁺π⁻en_US
dc.description.departmentSchool of Natural Sciences and Mathematicsen_US
dc.description.sponsorshipThis work is supported in part by the Ministry of Science and Technology of China under Contract No. 2009CB825200; Joint Funds of the National Natural Science Foundation of China under Contracts Nos. U1332201; National Natural Science Foundation of China (NSFC) under Contracts No. 11175188, No. 11375205, No. 11235011, No. 11375221, No. 11565006, and No. 10825524; German Research Foundation DFG under Collaborative Research Center Contract No. CRC-1044, 627240; Ministry of Development of Turkey under Contract No. DPT2006K-120470; U.S. Department of Energy under Contracts No. DE-SC-0012069, No. DE-SC-0010504, No. DE-SC-0010118, and No. DE-FG02-05ER41374; University of Groningen (RuG) under Contract No. 530-4CDP03, 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. 2017. "Determination of the Spin and Parity of the Z_c (3900)." Physical Review Letters 119(7), doi:10.1103/PhysRevLett.119.072001en_US
dc.identifier.issn0031-9007en_US
dc.identifier.issue7en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/5761
dc.identifier.volume119en_US
dc.language.isoenen_US
dc.publisherAmerican Physical Societyen_US
dc.relation.urihttp://dx.doi.org/10.1103/PhysRevLett.119.072001
dc.rights©2017 American Physical Society. All Rights Reserved.en_US
dc.sourcePhysical Review Letters
dc.subjectObserved confidence levels (Statistics)en_US
dc.subjectQuantum theoryen_US
dc.subjectElectron-positron interactionsen_US
dc.subjectMesonsen_US
dc.subjectNuclear spinen_US
dc.subjectParticles (Nuclear physics)en_US
dc.titleDetermination of the Spin and Parity of the Z_c (3900)en_US
dc.type.genrearticleen_US

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