@article{5797d6043e194791b73f1c3b23949730,
title = "Study of electromagnetic Dalitz decays χcJ →μ+μ-J /ψ",
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.",
author = "\{(BESIII Collaboration)\} and M. Ablikim and Achasov, \{M. N.\} and S. Ahmed and M. Albrecht and M. Alekseev and A. Amoroso and An, \{F. F.\} and Q. An and Y. Bai and O. Bakina and \{Baldini Ferroli\}, R. and Y. Ban and K. Begzsuren and Bennett, \{D. W.\} and Bennett, \{J. V.\} and N. Berger and M. Bertani and D. Bettoni and F. Bianchi and J. Bloms and I. Boyko and Briere, \{R. A.\} and H. Cai and X. Cai and A. Calcaterra and Cao, \{G. F.\} and Cetin, \{S. A.\} and J. Chai and Chang, \{J. F.\} and Chang, \{W. L.\} and G. Chelkov and G. Chen and Chen, \{H. S.\} and Chen, \{J. C.\} and Chen, \{M. L.\} and Chen, \{S. J.\} and Chen, \{Y. B.\} and W. Cheng and G. Cibinetto and F. Cossio and Dai, \{H. L.\} and Dai, \{J. P.\} and A. Dbeyssi and D. Dedovich and Deng, \{Z. Y.\} and A. Denig and I. Denysenko and M. Destefanis and \{De Mori\}, F. and Y. Ding",
note = "Publisher Copyright: {\textcopyright} 2019 authors. Published by the American Physical Society.",
year = "2019",
month = mar,
day = "1",
doi = "10.1103/PhysRevD.99.051101",
language = "English",
volume = "99",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "5",
}