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Observation of J/psi-->3gamma |
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| Authors: | Adams G S Anderson M Cummings J P Danko I Hu D Moziak B Napolitano J He Q Insler J Muramatsu H Park C S Thorndike E H Yang F Artuso M Blusk S Khalil S Li J Mountain R Nisar S Randrianarivony K Sultana N Skwarnicki T Stone S Wang J C Zhang L M Bonvicini G Cinabro D Dubrovin M Lincoln A Naik P Rademacker J Asner D M Edwards K W Reed J Briere R A Ferguson T Ma J S Y Tatishvili G Vogel H Watkins M E Rosner J L Alexander J P Cassel D G Duboscq J E Ehrlich R Fields L Galik R S Gibbons L Gray R Gray S W Hartill D L Heltsley B K Hertz D Hunt J M Kandaswamy J Kreinick D L Kuznetsov V E Ledoux J |
| Institution: | Rensselaer Polytechnic Institute, Troy, New York 12180, USA. |
| Abstract: | We report the first observation of the decay J/psi-->3gamma. The signal has a statistical significance of 6sigma and corresponds to a branching fraction of B(J/psi-->3gamma)=(1.2+/-0.3+/-0.2)x10;{-5}, in which the errors are statistical and systematic, respectively. The measurement uses psi(2S)-->pi;{+}pi;{-}J/psi events acquired with the CLEO-c detector operating at the CESR e;{+}e;{-} collider. |
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