Observation of $X(3872)\\to J/\\psi \\gamma$ and search for $X(3872)\\to\\psi'\\gamma$ in B decays
Journal
Physical Review Letters
Journal Volume
107
Pages
091803
Date Issued
2011-05
Author(s)
Trabelsi, K.
Singh, J.B.
Choi, S.-K.
Olsen, S.L.
Adachi, I.
Adamczyk, K.
Asner, D.M.
Aulchenko, V.
Aushev, T.
Aziz, T.
Bakich, A.M.
Barberio, E.
Belous, K.
Bhuyan, B.
Bischofberger, M.
Bondar, A.
Bra?ko, M.
Brodzicka, J.
Browder, T.E.
Chen, A.
Chen, P.
Cheon, B.G.
Cho, K.
Choi, Y.
Dalseno, J.
Dole?al, Z.
Eidelman, S.
Epifanov, D.
Gaur, V.
Gabyshev, N.
Golob, B.
Haba, J.
Hayasaka, K.
Hayashii, H.
Horii, Y.
Hoshi, Y.
Hou, W.-S.
Hsiung, Y.B.
Hyun, H.J.
Iijima, T.
Inami, K.
Ishikawa, A.
Iwabuchi, M.
Iwasaki, Y.
Iwashita, T.
Joshi, N.J.
Julius, T.
Kang, J.H.
Kawasaki, T.
Kiesling, C.
Kim, H.O.
Kim, J.B.
Kim, J.H.
Kim, K.T.
Kim, M.J.
Kim, S.K.
Kim, Y.J.
Kinoshita, K.
Ko, B.R.
Kobayashi, N.
Korpar, S.
Kri?an, P.
Kumar, R.
Kumita, T.
Kuzmin, A.
Kwon, Y.-J.
Lange, J.S.
Lee, M.J.
Lee, S.-H.
Li, Y.
Libby, J.
Lim, C.-L.
Liventsev, D.
Louvot, R.
Matvienko, D.
McOnie, S.
Miyabayashi, K.
Miyata, H.
Miyazaki, Y.
Mizuk, R.
Mohanty, G.B.
Mussa, R.
Nakano, E.
Nakao, M.
Nakazawa, H.
Natkaniec, Z.
Ng, C.
Nishida, S.
Nitoh, O.
Nozaki, T.
Ohshima, T.
Okuno, S.
Onuki, Y.
Pakhlova, G.
Park, C.W.
Park, H.K.
Pestotnik, R.
Petri?, M.
Piilonen, L.E.
R?hrken, M.
Sahoo, H.
Sakai, K.
Sakai, Y.
Sanuki, T.
Schneider, O.
Schwanda, C.
Seon, O.
Shapkin, M.
Shebalin, V.
Shibata, T.-A.
Shiu, J.-G.
Shwartz, B.
Smerkol, P.
Sohn, Y.-S.
Sokolov, A.
Solovieva, E.
Stani?, S.
Stari?, M.
Sumiyoshi, T.
Tatishvili, G.
Teramoto, Y.
Uchida, M.
Uehara, S.
Uglov, T.
Unno, Y.
Uno, S.
Usov, Y.
Varner, G.
Vossen, A.
Wang, X.L.
Watanabe, M.
Watanabe, Y.
Williams, K.M.
Yabsley, B.D.
Yamashita, Y.
Yuan, C.Z.
Zhang, C.C.
Zhang, Z.P.
Zhilich, V.
Zhou, P.
Zhulanov, V.
Abstract
We report a study of B→(J/ψγ)K and B→(ψ'γ)K decay modes using 772×10⁶ B ̅B events collected at the Υ(4S) resonance with the Belle detector at the KEKB energy-asymmetric e(+)e(-) collider. We observe X(3872)→J/ψγ and report the first evidence for χ(c2)→J/ψγ in B→(X_{c ̅cγ)K decays, while in a search for X(3872)→ψ'γ no significant signal is found. We measure the branching fractions, B(B(±)→X(3872)K(±))B(X(3872)→J/ψγ)=(1.78(-0.44)(+0.48)±0.12)×10(-6), B(B(±)→χ(c2)K(±))=(1.11(-0.34)(+0.36)±0.09)×10(-5), B(B(±)→X(3872)K(±))B(X(3872)→ψ'γ)<3.45×10⁶ (upper limit at 90% C.L.), and also provide upper limits for other searches.
Type
journal article