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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.accessioned2016-07-20T21:13:27Z
dc.date.available2016-07-20T21:13:27Z
dc.date.created2016-01-14en_US
dc.date.issued2016-01-14en_US
dc.identifier.issn1550-7998en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/4934
dc.description.abstractBased on data samples collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energies √s̅ > 4.4 GeV, the processes e⁺e⁻ → ωχ(c1,2) are observed for the first time. With an integrated luminosity of 1074 pb⁻¹ near √s̅ = 4.42 GeV, a significant ωχ(c2) signal is found, and the cross section is measured to be (20.9 ± 3.2 ± 2.5) pb. With 567 pb⁻¹ near √s̅ = 4.6 GeV, a clear ωχ(c1) signal is seen, and the cross section is measured to be (9.5 ± 2.1 ± 1.3) pb, while evidence is found for an ωχ(c2) signal. The first errors are statistical, and the second are systematic. Due to low luminosity or low cross section at other energies, no significant signals are observed. In the ωχ(c2) cross section, an enhancement is seen around √s̅ = 4.42 GeV. Fitting the cross section with a coherent sum of the ψ(4415) Breit-Wigner function and a phase-space term, the branching fraction B(ψ(4415) → ωχ(c2)) is obtained to be of the order of 10⁻¹.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; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No. 11179007, No. U1232201, No. U1332201; CAS under Contracts No. KJCX2-YW-N29, No. KJCX2-YW-N45; German Research Foundation DFG under Contract No. Collaborative Research Center CRC-1044; 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-FG02-04ER41291, No. DE-FG02-05ER41374, No. DE-FG02-94ER40823, No. DESC0010118; 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/PhysRevD.93.011102
dc.rights©2016 American Physical Societyen_US
dc.sourcePhysical Review D - Particles, Fields, Gravitation and Cosmology
dc.subjectLuminescenceen_US
dc.subjectBranching fractions (Nuclear physics)en_US
dc.subjectUncertaintyen_US
dc.subjectPhase space (Statistical physics)en_US
dc.subjectLeptonic decaysen_US
dc.subjectPhotonsen_US
dc.subjectAtomic massen_US
dc.titleObservation of e⁺e⁻ → ωχ_{c1, 2} near √s̅ = 4.42 and 4.6 GeVen_US
dc.type.genreArticleen_US
dc.identifier.bibliographicCitationAblikim, M., M. N. Achasov, X. C. Ai, O. Albayrak, et al. 2016. "Observation of e⁺e⁻ → ωχ_{c1, 2} near √s̅ = 4.42 and 4.6 GeV" Physical Review D - Particles, Fields, Gravitation and Cosmology 93(1), doi:10.1103/PhysRevD.93.011102.en_US
dc.identifier.volume93en_US
dc.identifier.issue1en_US
dc.contributor.utdAuthorLou, Xinchouen_US
dc.contributor.ORCID0000-0003-0867-2189 (Lou, X)en_US


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