Evidence for ηc(2S) in ψ(3686)→γKS0K ±π+π+π-

M. Ablikim, M. N. Achasov, O. Albayrak, D. J. Ambrose, F. F. An, Q. An, J. Z. Bai, R. Baldini Ferroli, Y. Ban, J. Becker, J. V. Bennett, M. Bertani, J. M. Bian, E. Boger, O. Bondarenko, I. Boyko, R. A. Briere, V. Bytev, 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, Y. B. Chen, H. P. Cheng, 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, L. Y. Dong, M. Y. Dong, S. X. Du, H. Muramatsu, R. Poling, BESIII Collaboration

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Abstract

We search for the M1 radiative transition ψ(3686) →γηc(2S) by reconstructing the exclusive ηc(2S)→KS0K±π+π +π- decay using 1.06×108 ψ(3686) events collected with the BESIII detector. The signal is observed with a statistical significance of greater than 4 standard deviations. The measured mass of the ηc(2S) is 3646.9±1.6(stat)±3.6(syst) MeV/c2, and the width is 9.9±4.8(stat)±2.9(syst) MeV/c2. The product branching fraction is measured to be B(ψ(3686)→γηc(2S)) ×B(ηc(2S)→KS0K±π+π +π-)=(7.03±2.10(stat)±0.70(syst)) ×10-6. This measurement complements a previous BESIII measurement of ψ(3686)→γηc(2S) with ηc(2S)→KS0K±π+ and K +K-π0.

Original languageEnglish (US)
Article number052005
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume87
Issue number5
DOIs
StatePublished - Mar 4 2013

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