Observation of the Helicity-Selection-Rule Suppressed Decay of the χ(c2) Charmonium State

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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.authorAhmed, S.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.authorLou, Xinchouen_US
dc.contributor.authorBESIII Collaborationen_US
dc.contributor.utdAuthorLou, Xinchouen_US
dc.date.accessioned2018-10-01T16:50:56Z
dc.date.available2018-10-01T16:50:56Z
dc.date.created2017-12-07en_US
dc.date.issued2018-10-01
dc.descriptionIncludes supplementary materialen_US
dc.description.abstractThe decays of χ(c2) → K⁺K⁻ π⁰, K(S)K(±)π(∓), and π⁺π⁻π⁰ are studied with the ψ(3686) data samples collected with the Beijing Spectrometer ( BESIII). For the first time, the branching fractions of χ(c2) → K*K̅, χ(c2) → a₂(±)(1320)π(∓)/a₂⁰(1320)π⁰, and χ(c2) → ρ(770)(±)π(∓) are measured. Here, K*K̅ denotes both K*(±)K(∓) and its isospin-conjugated process K*⁰K̅⁰ + c.c., and K* denotes the resonances K*(892), K₂*(1430), and K₃*(1780). The observations indicate a strong violation of the helicity selection rule in χ(c2) decays into vector and pseudoscalar meson pairs. The measured branching fractions of χ(c2) → K*(892)K̅ are more than ten times larger than the upper limit of χ(c2) → ρ(770)(±)π(∓), which is so far the first direct observation of a significant U-spin symmetry breaking effect in charmonium decays.en_US
dc.description.departmentSchool of Natural Sciences and Mathematicsen_US
dc.identifier.bibliographicCitationAblikim, M., M. N. Achasov, S. Ahmed, X. C. Ai, et al. 2017. "Observation of the helicity-selection-rule suppressed decay of the χ(c2) charmonium state." Physical Review D 96(11), doi:10.1103/PhysRevD.96.111102en_US
dc.identifier.issn2470-0010en_US
dc.identifier.issue11en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/6174
dc.identifier.volume96en_US
dc.language.isoenen_US
dc.publisherAmer Physical Socen_US
dc.relation.urihttp://dx.doi.org/10.1103/PhysRevD.96.111102
dc.rights©2017 American Physical Society. All Rights Reserved.en_US
dc.sourcePhysical Review D
dc.subjectMesonsen_US
dc.subjectIsobaric spinen_US
dc.subjectBranching fractions (Nuclear physics)en_US
dc.subjectCharmoniumen_US
dc.titleObservation of the Helicity-Selection-Rule Suppressed Decay of the χ(c2) Charmonium Stateen_US
dc.type.genrearticleen_US

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