Evidence for ηc→γγ and measurement of J/ψ→3γ

M. Ablikim, M. N. Achasov, D. J. Ambrose, F. F. An, Q. An, Z. H. An, J. Z. Bai, Y. Ban, J. Becker, J. V. Bennett, M. Bertani, J. M. Bian, E. Boger, O. Bondarenko, I. Boyko, R. A. Briere, V. Bytev, X. Cai, O. Cakir, A. CalcaterraG. 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, J. Fang, S. S. Fang, H. Muramatsu, R. Poling, BESIII Collaboration

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Abstract

The decay of J/ψ to three photons is studied using ψ(3686) →π+π-J/ψ in a sample of 1.0641×108 ψ(3686) events collected with the BESIII detector. Evidence of the direct decay of ηc to two photons, ηc→γγ , is reported, and the product branching fraction is determined to be B(J/ψ→γηcc→γγ)= (4.5±1.2±0.6)×10-6, where the first error is statistical and the second is systematic. The branching fraction for J/ψ→3γ is measured to be (11.3±1.8±2.0) ×10-6 with improved precision.

Original languageEnglish (US)
Article number032003
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume87
Issue number3
DOIs
StatePublished - Feb 8 2013

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