Observation of X(3872)→J/ψγ and search for X(3872)→ψ<sup>′</sup>γ in B decays

Date Issued
26-08-2011
Author(s)
Bhardwaj, V.
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.
BraÄ ko, M.
Brodzicka, J.
Browder, T. E.
Chen, A.
Chen, P.
Cheon, B. G.
Cho, K.
Choi, Y.
Dalseno, J.
Doležal, 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.
Križan, P.
Kumar, R.
Kumita, T.
Kuzmin, A.
Kwon, Y. J.
Lange, J. S.
Lee, M. J.
Lee, S. H.
Li, Y.
Indian Institute of Technology, Madras
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.
PetriÄ , M.
Piilonen, L. E.
DOI
Abstract
We report a study of B→(J/ψγ)K and B→(ψ ′γ)K decay modes using 772×106 BB̄ 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 χc2→J/ψγ in B→(Xcc̄γ)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 ±→χc2K±)=(1.11-0.34+0. 36±0.09)×10-5, B(B±→X(3872)K ±)B(X(3872)→ψ′γ)<3. 45×10-6 (upper limit at 90% C.L.), and also provide upper limits for other searches. © 2011 American Physical Society.
Volume
107