Measurement of branching fractions for B → J/ψηK decays and search for a narrow resonance in the J/ψη final state

T. Iwashita, K. Miyabayashi, V. Bhardwaj, I. Adachi, H. Aihara, D. M. Asner, T. Aushev, A. M. Bakich, A. Bala, B. Bhuyan, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, M. C. Chang, A. Chen, B. G. Cheon, K. Chilikin, R. Chistov, K. ChoV. Chobanova, S. K. Choi, Y. Choi, D. Cinabro, J. Dalseno, M. Danilov, Z. Doležal, Z. Drásal, D. Dutta, S. Eidelman, S. Esen, H. Farhat, J. E. Fast, M. Feindt, T. Ferber, A. Frey, V. Gaur, N. Gabyshev, S. Ganguly, R. Gillard, Y. M. Goh, B. Golob, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, T. Higuchi, Y. Horii, Y. Hoshi, W. S. Hou, H. J. Hyun, T. Iijima, A. Ishikawa, R. Itoh, Y. Iwasaki, I. Jaegle, T. Julius, D. H. Kah, J. H. Kang, E. Kato, T. Kawasaki, H. Kichimi, C. Kiesling, D. Y. Kim, H. J. Kim, H. O. Kim, J. B. Kim, J. H. Kim, M. J. Kim, Y. J. Kim, K. Kinoshita, J. Klucar, B. R. Ko, P. Kodyšs, S. Korpar, P. Križan, P. Krokovny, T. Kuhr, T. Kumita, A. Kuzmin, Y. J. Kwon, J. S. Lange, S. H. Lee, Y. Li, J. Libby, C. Liu, Y. Liu, P. Lukin, D. Matvienko, H. Miyata, R. Mizuk, A. Moll, T. Mori, Y. Nagasaka, E. Nakano, M. Nakao, H. Nakazawa, Z. Natkaniec, M. Nayak, C. Ng, N. K. Nisar, S. Nishida, O. Nitoh, S. Ogawa, S. Okuno, G. Pakhlova, E. Panzenböck, H. Park, H. K. Park, T. K. Pedlar, R. Pestotnik, M. Petrič, L. E. Piilonen, M. Ritter, M. Röhrken, A. Rostomyan, S. Ryu, H. Sahoo, T. Saito, K. Sakai, Y. Sakai, S. Sandilya, D. Santel, L. Santelj, T. Sanuki, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, D. Semmler, K. Senyo, O. Seon, M. E. Sevior, M. Shapkin, C. P. Shen, T. A. Shibata, J. G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, Y. S. Sohn, A. Sokolov, E. Solovieva, S. Stanič, M. Starič, M. Steder, T. Sumiyoshi, U. Tamponi, K. Tanida, G. Tatishvili, Y. Teramoto, K. Trabelsi, T. Tsuboyama, M. Uchida, S. Uehara, Y. Unno, S. Uno, P. Urquijo, P. Vanhoefer, G. Varner, K. E. Varvell, V. Vorobyev, A. Vossen, M. N. Wagner, C. H. Wang, M. Z. Wang, P. Wang, X. L. Wang, M. Watanabe, Y. Watanabe, K. M. Williams, Eunil Won, B. D. Yabsley, Y. Yamashita, S. Yashchenko, Y. Yook, C. Z. Yuan, Z. P. Zhang, V. Zhilich, A. Zupanc

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Abstract

We report an observation of the B<sup>±</sup>→ J/ψηK<sup>±</sup> and B<sup>0</sup> → J/ψηK<sup>0</sup>S decays using 772 × 10<sup>6</sup>BB¯ pairs collected at the γ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e<sup>+</sup>e<sup>-</sup> collider. We obtain the branching fractions B(B?→ J/ψηK<sup>±</sup>) = (1.27 ±0.11(stat.) ±0.11(syst.)) ×10<sup>-4</sup> and B(B<sup>0</sup> → J/ψηK<sup>0</sup> S ) = (5.22 ±0.78(stat.) ± 0.49(syst.)) ×10<sup>-5</sup>. We search for a new narrow charmonium(-like) state X in the J/ψη mass spectrum and find no significant excess. We set upper limits on the product of branching fractions, B(B±→ X K± )B(X → J/ψη), at 3872MeVc<sup>-2</sup> where aC-odd partner of X(3872) may exist, at ψ(4040) and ψ(4160) assuming their known mass and width, and over a range from 3.8 to 4.8 GeV c<sup>-2</sup>. The obtained upper limits at 90% confidence level for X<sup>C-odd</sup>(3872), ψ(4040), and ψ(4160) are 3.8 ×10<sup>-6</sup>, 15.5 ×10<sup>-6</sup>, and 7.4 ×10<sup>-6</sup>, respectively.

Original languageEnglish
Article number43C01
JournalProgress of Theoretical and Experimental Physics
Volume2014
Issue number4
DOIs
Publication statusPublished - 2014 Apr 16

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Iwashita, T., Miyabayashi, K., Bhardwaj, V., Adachi, I., Aihara, H., Asner, D. M., Aushev, T., Bakich, A. M., Bala, A., Bhuyan, B., Bonvicini, G., Bozek, A., Bračko, M., Browder, T. E., Chang, M. C., Chen, A., Cheon, B. G., Chilikin, K., Chistov, R., ... Zupanc, A. (2014). Measurement of branching fractions for B → J/ψηK decays and search for a narrow resonance in the J/ψη final state. Progress of Theoretical and Experimental Physics, 2014(4), [43C01]. https://doi.org/10.1093/ptep/ptu043