Observation of J/psi-->3gamma

• Published in: Physical review letters Vol. 101; no. 10; p. 101801
• Main 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, Mahlke-Krüger, H, Mohapatra, D, Onyisi, P U E, Patterson, J R, Peterson, D, Riley, D, Ryd, A, Sadoff, A J, Shi, X, Stroiney, S, Sun, W M, Wilksen, T, Athar, S B, Patel, R, Yelton, J, Rubin, P, Eisenstein, B I, Karliner, I, Mehrabyan, S, Lowrey, N, Selen, M, White, E J, Wiss, J, Mitchell, R E, Shepherd, M R, Besson, D, Pedlar, T K, Cronin-Hennessy, D, Gao, K Y, Hietala, J, Kubota, Y, Klein, T, Lang, B W, Poling, R, Scott, A W, Zweber, P, Dobbs, S, Metreveli, Z, Seth, K K, Tomaradze, A, Libby, J, Powell, A
• Format: Journal Article
• Language: English
• Published: United States 05.09.2008
• ISSN: 0031-9007

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.