Evidence for eta(c) -> gamma gamma and measurement of J/psi -> 3 gamma
- Ablikim, M.
- Achasov, M. N.
- Ambrose, D. J.
- An, F. F.
- An, Q.
- An, Z. H.
- Bai, J. Z.
- Ban, Y.
- Becker, J.
- Bennett, J. V.
- Bertani, M.
- Bian, J. M.
- Boger, E.
- Bondarenko, O.
- Boyko, I.
- Briere, R. A.
- Bytev, V.
- 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.
- Dong, L. Y.
- Dong, M. Y.
- Du, S. X.
- Kalantar-Nayestanaki, N.
- Kavatsyuk, M.
- Loehner, H.
- Messchendorp, J. G.
Publication date
February 2013
DOIAbstract
The decay of J/psi to three photons is studied using psi (3686) -> pi(+) pi(-) J/psi in a sample of 1.0641 X 10(8) psi (3686) events collected with the BESIII detector. Evidence of the direct decay of eta(c) to two photons, eta(c) -> gamma gamma, is reported, and the product branching fraction is determined to be B(J/psi -> gamma eta(c,) eta(c) -> gamma gamma = (4.5 +/- 1.2 +/- 0.6) X 10(-6), where the first error is statistical and the second is systematic. The branching fraction for J/psi -> 3 gamma is measured to be (11.3 +/- 1.8 +/- 2.0) X 10(-6) with improved precision. DOI: 10.1103/PhysRevD.87.032003</p
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