Observation of X(3872)→J/ψγ and search for X(3872)→ψγ in B decays

V. Bhardwaj, K. Trabelsi, J. B. Singh, S. K. Choi, S. L. Olsen, I. Adachi, K. Adamczyk, D. M. Asner, V. Aulchenko, T. Aushev, T. Aziz, A. M. Bakich, E. Barberio, K. Belous, B. Bhuyan, M. Bischofberger, A. Bondar, M. Bračko, J. Brodzicka, T. E. BrowderA. Chen, P. Chen, B. G. Cheon, K. Cho, Y. Choi, J. Dalseno, Z. Doležal, S. Eidelman, D. Epifanov, V. Gaur, N. Gabyshev, B. Golob, J. Haba, K. Hayasaka, H. Hayashii, Y. Horii, Y. Hoshi, W. S. Hou, Y. B. Hsiung, H. J. Hyun, T. Iijima, K. Inami, A. Ishikawa, M. Iwabuchi, Y. Iwasaki, T. Iwashita, N. J. Joshi, T. Julius, J. H. Kang, T. Kawasaki, C. Kiesling, H. O. Kim, J. B. Kim, J. H. Kim, K. T. Kim, M. J. Kim, S. K. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, N. Kobayashi, S. Korpar, P. Križan, R. Kumar, T. Kumita, A. Kuzmin, Youngjoon Kwon, J. S. Lange, M. J. Lee, S. H. Lee, Y. Li, J. Libby, C. L. Lim, D. Liventsev, R. Louvot, D. Matvienko, S. McOnie, K. Miyabayashi, H. Miyata, Y. Miyazaki, R. Mizuk, G. B. Mohanty, R. Mussa, E. Nakano, M. Nakao, H. Nakazawa, Z. Natkaniec, C. Ng, S. Nishida, O. Nitoh, T. Nozaki, T. Ohshima, S. Okuno, Y. Onuki, G. Pakhlova, C. W. Park, H. K. Park, R. Pestotnik, M. Petrič, L. E. Piilonen, M. Röhrken, H. Sahoo, K. Sakai, Y. Sakai, T. Sanuki, O. Schneider, C. Schwanda, O. Seon, M. Shapkin, V. Shebalin, T. A. Shibata, J. G. Shiu, B. Shwartz, P. Smerkol, Y. S. Sohn, A. Sokolov, E. Solovieva, S. Stanič, M. Starič, T. Sumiyoshi, G. Tatishvili, Y. Teramoto, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, Y. Usov, G. Varner, A. Vossen, X. L. Wang, M. Watanabe, Y. Watanabe, K. M. Williams, B. D. Yabsley, Y. Yamashita, C. Z. Yuan, C. C. Zhang, Z. P. Zhang, V. Zhilich, P. Zhou, V. Zhulanov, A. Zupanc

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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)→ψγ 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)→ψγ)<3. 45×10-6 (upper limit at 90% C.L.), and also provide upper limits for other searches.

Original languageEnglish
Article number091803
JournalPhysical review letters
Volume107
Issue number9
DOIs
Publication statusPublished - 2011 Aug 26

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    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., Bračko, M., Brodzicka, J., ... Zupanc, A. (2011). Observation of X(3872)→J/ψγ and search for X(3872)→ψγ in B decays. Physical review letters, 107(9), [091803]. https://doi.org/10.1103/PhysRevLett.107.091803