An Improved Limit for Γ_{ee} of X(3872) and Γ_{ee} Measurement of ψ(3686)

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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.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.accessioned2017-03-31T19:34:36Z
dc.date.available2017-03-31T19:34:36Z
dc.date.created2015-08-07en_US
dc.date.issued2015-08-07en_US
dc.description.abstractUsing the data sets taken at center-of-mass energies above 4 GeV by the BESIII detector at the BEPCII storage ring, we search for the reaction e⁺e⁻→ γ(ISR}X(3872) → γ{ISR}π⁺π⁻J/ψ via the Initial State Radiation technique. The production of a resonance with quantum numbers JPC=1⁺⁺ such as the X(3872) via single photon e+e- annihilation is forbidden, but is allowed by a next-to-leading order box diagram. We do not observe a significant signal of X(3872), and therefore give an upper limit for the electronic width times the branching fraction Γ{ee} ^{X(3872)} ℬ(X(3872) → π⁺π⁻J/ψ) < 0.13 eV at the 90% confidence level. This measurement improves upon existing limits by a factor of 46. Using the same final state, we also measure the electronic width of the ψ(3686) to be Γ {ee} ^{ψ(3686)} = 2213 ± 18{stat} ± 99{sys} eV. © 2015 The Authors.en_US
dc.description.sponsorshipNational Key Basic Research Program of China (Contract no.2015CB856700); National Natural Science Foundation of China (NSFC) (Contract nos..11125525, 11235011, 11322544, 11335008, 11425524); Joint Large-Scale Scientific Facility Funds of the NSFC and CAS (contract nos. 11179007, U1232201, U1332201); CAS (contract nos. KJCX2-YW-N29, KJCX2-YW-N45); German Research Foundation DFG (contract no. CRC-1044); Seventh Framework Programme of the European Union under Marie Curie International Incoming Fellowship Grant (agreement no. 627240; Ministry of Development of Turkey (contract no. DPT2006K-120470); Russian Foundation for Basic Research (contract no. 14-07-91152); U.S. Department of Energy (contract nos. DE-FG02-04ER41291, DE-FG02-05ER41374, DE-FG02-94ER40823, DESC0010118); WCU Program of National Research Foundation of Korea (contract no. R32-2008-000-10155-0).en_US
dc.identifier.bibliographicCitationAblikim, M., M. N. Achasov, X. C. Ai, O. Albayrak, et al. 2015. "An improved limit for Γ_{ee} of X(3872) and Γ_{ee} measurement of ψ(3686)." Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 749, doi: 10.1016/j.physletb.2015.08.013en_US
dc.identifier.issn0370-2693en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/5331
dc.identifier.volume749en_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.urihttp://dx.doi.org/10.1016/j.physletb.2015.08.013
dc.rightsCC BY 4.0 (Attribution)en_US
dc.rights©2015 The Authorsen_US
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en_US
dc.sourcePhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
dc.subjectCharmoniumen_US
dc.subjectX(3872) mesonsen_US
dc.subjectΨ(3686) mesonsen_US
dc.subjectAtomic spectroscopyen_US
dc.subjectElectron-positron interactionsen_US
dc.subjectBranching fractions (Nuclear physics)en_US
dc.subjectParticles (Nuclear physics)—Charmen_US
dc.titleAn Improved Limit for Γ_{ee} of X(3872) and Γ_{ee} Measurement of ψ(3686)en_US
dc.type.genreArticleen_US

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