Evidence for eta(c)(2S) in psi(3686) -> gamma(KSK +/-)-K-0 pi(-/+)pi(+)pi(-)
- Ablikim, M.
- Achasov, M. N.
- Albayrak, O.
- Ambrose, D. J.
- An, F. F.
- An, Q.
- Bai, J. Z.
- Ferroli, R. Baldini
- Ban, Y.
- Becker, J.
- Bennett, J. V.
- Bertani, M.
- Bian, J. M.
- Boger, E.
- Bondarenko, O.
- Boyko, I.
- Briere, R. A.
- Bytev, V.
- Cai, H.
- Cai, X.
- Cakir, O.
- Calcaterra, A.
- Cao, G. F.
- Cetin, S. A.
- Chang, J. F.
- Chelkov, G.
- Chen, G.
- Chen, H. S.
- Chen, J.C.
- Chen, M.L.
- Chen, S. J.
- Chen, X.
- Chen, Y.B.
- Cheng, H. P.
- Chu, Y. P.
- Cronin-Hennessy, D.
- Dai, H. L.
- Dai, J.P.
- Dedovich, D.
- Deng, Z. Y.
- Denig, A.
- Denysenko, I.
- Destefanis, M.
- Ding, W. M.
- Ding, Y.
- Kalantar-Nayestanaki, N.
- Kavatsyuk, M.
- Liu, Cheng
- Loehner, H.
- Messchendorp, J. G.
DOIAbstract
We search for the M1 radiative transition psi(3686) -> gamma eta(c)(2S) by reconstructing the exclusive eta(c)(2S) -> (KSK +/-)-K-0 pi(-/+)pi(+)pi(-) decay using 1.06 X 10(8) psi(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 eta(c)(2S) is 3646.9 +/- 1.6(stat) +/- 3.6(syst) MeV/c(2), and the width is 9.9 +/- 4.8(stat) +/- 2.9(syst) MeV/c(2). The product branching fraction is measured to be B(psi(3686) -> gamma eta(c)(2S)) X B(eta(c)(2S) -> gamma(KSK +/-)-K-0 pi(-/+)pi(+)pi(-) = (7.03 +/- 2.10(stat) +/- 0.70(syst)) X 10(-6). This measurement complements a previous BESIII measurement of psi(3686) -> gamma eta...
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