@article{c353bd34466a4d4588254311718fda2e,
title = "Observation of e(+)e(-) -> gamma X(3872) at BESIII",
abstract = "With data samples collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energies from 4.009 to 4.420 GeV, the process e(+)e(-) -> gamma X(3872) is observed for the first time with a statistical significance of 6.3 sigma. The measured mass of the X(3872) is (3871.9 +/- 0.7(stat) +/- 0.2(syst)) MeV/c(2), in agreement with previous measurements. Measurements of the product of the cross section sigma[e(+)e(-) -> gamma X(3872)] and the branching fraction B [X(3872) -> pi(+)pi(-)J/psi] 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) -> gamma X(3872).",
keywords = "ENERGY",
author = "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 Ferroli, {R. Baldini} 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 H.S. Chen and J.C. Chen and M.L. Chen and Chen, {S. J.} and X. Chen and Chen, {X. R.} and Y.B. Chen and Cheng, {H. P.} and Chu, {X. K.} and Chu, {Y. P.} and D. Cronin-Hennessy and Dai, {H. L.} and J.P. Dai and D. Dedovich and Deng, {Z. Y.} and A. Denig and I. Denysenko and M. Destefanis and N. Kalantar-Nayestanaki and M. Kavatsyuk and H. Loehner and Messchendorp, {J. G.} and H. Moeini and {BESIII Collaboration}",
note = "Library comment: authors and affiliations checked",
year = "2014",
month = mar,
day = "3",
doi = "10.1103/PhysRevLett.112.092001",
language = "English",
volume = "112",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "AMER PHYSICAL SOC",
number = "9",
}