@article{f3f4713271764a7b99d0662ba803bf03,
title = "Observation of e+e- → γx(3872) at BESIII",
abstract = "With data samples collected with the BESIII detector operating at the BEPCII storage ring at center-ofmass energies from 4.009 to 4.420 GeV, the process e+e-→ γX(3872) is observed for the first time with a statistical significance of 6.3σ. The measured mass of the X(3872) is (3871.9 ± 0.7stat± 0.2syst) MeV/c2, in agreement with previous measurements. Measurements of the product of the cross section σ[e+e-→ γX(3872)] and the branching fraction B[X(3872) → π+π-J/ψ] at center-of-mass energies 4.009, 4.229, 4.260, and 4.360 GeV are reported. Our measurements are consistent with expectations for the radiative transition process Y(4260) → γX(3872).",
author = "\{BESIII Collaboration\} and M. Ablikim and Achasov, \{M. N.\} and Ai, \{X. C.\} and O. Albayrak and Ambrose, \{D. J.\} and An, \{F. F.\} and Q. An and Bai, \{J. Z.\} and \{Baldini Ferroli\}, R. and Y. Ban and Bennett, \{J. V.\} and M. Bertani and Bian, \{J. M.\} and E. Boger and O. Bondarenko and I. Boyko and S. Braun and Briere, \{R. A.\} and H. Cai and X. Cai and O. Cakir and A. Calcaterra and Cao, \{G. F.\} and Cetin, \{S. A.\} and Chang, \{J. F.\} and G. Chelkov and G. Chen and Chen, \{H. S.\} and Chen, \{J. C.\} and Chen, \{M. L.\} and Chen, \{S. J.\} and X. Chen and Chen, \{X. R.\} and Chen, \{Y. B.\} and Cheng, \{H. P.\} and Chu, \{X. K.\} and Chu, \{Y. P.\} and D. Cronin-Hennessy and Dai, \{H. L.\} and Dai, \{J. P.\} and D. Dedovich and Deng, \{Z. Y.\} and A. Denig and I. Denysenko and M. Destefanis and Ding, \{W. M.\} and Y. Ding and C. Dong and J. Dong and Dong, \{L. Y.\}",
note = "Publisher Copyright: {\textcopyright} 2014 American Physical Society.",
year = "2014",
month = mar,
day = "3",
doi = "10.1103/PhysRevLett.112.092001",
language = "English",
volume = "112",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "9",
}