Observation of e+e- → γx(3872) at BESIII

M. Ablikim, M. N. Achasov, X. C. Ai, O. Albayrak, D. J. Ambrose, F. F. An, Q. An, J. Z. Bai, R. Baldini Ferroli, Y. Ban, J. V. Bennett, M. Bertani, J. M. Bian, E. Boger, O. Bondarenko, I. Boyko, S. Braun, R. A. Briere, H. Cai, X. CaiO. Cakir, A. Calcaterra, G. F. Cao, S. A. Cetin, J. F. Chang, G. Chelkov, G. Chen, H. S. Chen, J. C. Chen, M. L. Chen, S. J. Chen, X. Chen, X. R. Chen, Y. B. Chen, H. P. Cheng, X. K. Chu, Y. P. Chu, D. Cronin-Hennessy, H. L. Dai, J. P. Dai, D. Dedovich, Z. Y. Deng, A. Denig, I. Denysenko, M. Destefanis, W. M. Ding, Y. Ding, C. Dong, H. Muramatsu, R. Poling, BESIII Collaboration

Research output: Contribution to journalArticlepeer-review

159 Scopus citations


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).

Original languageEnglish (US)
Article number092001
JournalPhysical review letters
Issue number9
StatePublished - Mar 3 2014

Bibliographical note

Publisher Copyright:
© 2014 American Physical Society.


Dive into the research topics of 'Observation of e+e- → γx(3872) at BESIII'. Together they form a unique fingerprint.

Cite this