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Observation of X(3872) -> J/psi gamma and Search for X(3872) -> psi 'gamma in B Decays

作者	Bhardwaj, V; Trabelsi, K; Singh, JB; Choi, SK; Olsen, SL; Adachi, I; Adamczyk, K; Asner, DM; Aulchenko, V; Aushev, T; Aziz, T; Bakich, AM; Barberio, E; Belous, K; Bhuyan, B; Bischofberger, M; Bondar, A; Bracko, M; Brodzicka, J; Browder, TE; Chen, A; Chen, P; Cheon, BG; Cho, K; Choi, Y; Dalseno, J; Dolezal, Z; Eidelman, S; Epifanov, D; Gaur, V; Gabyshev, N; Golob, B; Haba, J; Hayasaka, K; Hayashii, H; Horii, Y; Hoshi, Y; Hou, WS; Hsiung, YB; Hyun, HJ; Iijima, T; Inami, K; Ishikawa, A; Iwabuchi, M; Iwasaki, Y; Iwashita, T; Joshi, NJ; Julius, T; Kang, JH; Kawasaki, T; Kiesling, C; Kim, HO; Kim, JB; Kim, JH; Kim, KT; Kim, MJ; Kim, SK; Kim, YJ; Kinoshita, K; Ko, BR; Kobayashi, N; Korpar, S; Krizan, P; Kumar, R; Kumita, T; Kuzmin, A; Kwon, YJ; Lange, JS; Lee, MJ; Lee, SH; Li, Y; Libby, J; Lim, CL; Liventsev, D; Louvot, R; Matvienko, D; McOnie, S; Miyabayashi, K; Miyata, H; Miyazaki, Y; Mizuk, R; Mohanty, GB; Mussa, R; Nakano, E; Nakao, M; Nakazawa, H; Natkaniec, Z; Ng, C; Nishida, S; Nitoh,

选自	期刊 PHYSICAL REVIEW LETTERS; 卷期 2011年107-9; 页码 91803-91803

关联知识点

[摘要]：We report a study of B -> (J/psi gamma)K and B -> (psi'gamma)K decay modes using 772 X 10(6) B (B) over bar events collected at the Y(4S) resonance with the Belle detector at the KEKB energy-asymmetric e(+)e(-) collider. We observe X(3872) -> J/psi gamma and report the first evidence for chi(c2) -> J/psi gamma in B -> (X(c (c) over bar)gamma)K decays, while in a search for X(3872) -> psi'gamma no significant signal is found. We measure the branching fractions, B(B(+/-) -> X(3872)K(+/-))B(X(3872) -> J/psi gamma) = (1.78(-0.44)(+0.48) +/- 0.12) X 10(-6), B(B(+/-) -> chi(c2)K(+/-)) = (1.11(-0.34)(+0.36) +/- 0.09) X 10(-5), B(B(+) -> X(3872)K(+))B(X(3872) -> psi'gamma) < 3.45 X 10(-6) (upper limit at 90% C. L.), and also provide upper limits for other searches.
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