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- W2950064595 abstract "Using 4.48×108 ψ(3686) events collected with the BESIII detector, we search for the decays χcJ→μ+μ−J/ψ through the radiative decays ψ(3686)→γχcJ, where J=0, 1, 2. The decays χc1,2→μ+μ−J/ψ are observed, and the corresponding branching fractions are measured to be B(χc1→μ+μ−J/ψ)=(2.51±0.18±0.20)×10−4 and B(χc2→μ+μ−J/ψ)=(2.33±0.18±0.29)×10−4, where the first uncertainty is statistical and the second one systematic. No significant χc0→μ+μ−J/ψ decay is observed, and the upper limit on the branching fraction is determined to be 2.0×10−5 at 90% confidence level. Also, we present a study of dimuon invariant mass dependent transition form factor for the decays χc1,2→μ+μ−J/ψ.Received 20 January 2019DOI:https://doi.org/10.1103/PhysRevD.99.051101Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasElectroweak interactionParticle interactionsPhysical SystemsCharm quarkMesonsMuonsTechniquesParticle decaysParticles & Fields" @default.
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