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          Institute: MPI für Physik     Collection: YB 2016     Display Documents

ID: 715998.0, MPI für Physik / YB 2016
Measurement of branching fractions for B \\to J/\\psi \\eta K decays and search for a narrow resonance in the J/\\psi \\eta final state
Authors:Belle Collaboration; 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.; Cho, K.; Chobanova, V.; Choi, S. -K.; Choi, Y.; Cinabro, D.; Dalseno, J.; Danilov, M.; Doležal, Z.; Drásal, Z.; Dutta, D.; Eidelman, S.; Esen, S.; Farhat, H.; Fast, J. E.; Feindt, M.; Ferber, T.; Frey, A.; Gaur, V.; Gabyshev, N.; Ganguly, S.; Gillard, R.; Goh, Y. M.; Golob, B.; Haba, J.; Hara, T.; Hayasaka, K.; Hayashii, H.; Higuchi, T.; Horii, Y.; Hoshi, Y.; Hou, W. -S.; Hyun, H. J.; Iijima, T.; Ishikawa, A.; Itoh, R.; Iwasaki, Y.; Jaegle, I.; Julius, T.; Kah, D. H.; Kang, J. H.; Kato, E.; Kawasaki, T.; Kichimi, H.; Kiesling, C.; Kim, D. Y.; Kim, H. J.; Kim, H. O.; Kim, J. B.; Kim, J. H.; Kim, M. J.; Kim, Y. J.; Kinoshita, K.; Klucar, J.; Ko, B. R.; Kodyš, P.; Korpar, S.; Križan, P.; Krokovny, P.; Kuhr, T.; Kumita, T.; Kuzmin, A.; Kwon, Y. -J.; Lange, J. S.; Lee, S. -H.; Li, Y.; Libby, J.; Liu, C.; Liu, Y.; Lukin, P.; Matvienko, D.; Miyata, H.; Mizuk, R.; Moll, A.; Mori, T.; Nagasaka, Y.; Nakano, E.; Nakao, M.; Nakazawa, H.; Natkaniec, Z.; Nayak, M.; Ng, C.; Nisar, N. K.; Nishida, S.; Nitoh, O.; Ogawa, S.; Okuno, S.; Pakhlova, G.; Panzenbock, E.; Park, H.; Park, H. K.; Pedlar, T. K.; Pestotnik, R.; Petrič, M.; Piilonen, L. E.; Ritter, M.; Rohrken, M.; Rostomyan, A.; Ryu, S.; Sahoo, H.; Saito, T.; Sakai, K.; Sakai, Y.; Sandilya, S.; Santel, D.; Santelj, L.; Sanuki, T.; Savinov, V.; Schneider, O.; Schnell, G.; Schwanda, C.; Semmler, D.; Senyo, K.; Seon, O.; Sevior, M. E.; Shapkin, M.; Shen, C. P.; Shibata, T. -A.; Shiu, J. -G.; Shwartz, B.; Sibidanov, A.; Simon, F.; Sohn, Y. -S.; Sokolov, A.; Solovieva, E.; Stanic, S.; Starič, M.; Steder, M.; Sumiyoshi, T.; Tamponi, U.; Tanida, K.; Tatishvili, G.; Teramoto, Y.; Trabelsi, K.; Tsuboyama, T.; Uchida, M.; Uehara, S.; Unno, Y.; Uno, S.; Urquijo, P.; Vanhoefer, P.; Varner, G.; Varvell, K. E.; Vorobyev, V.; Vossen, A.; Wagner, M. N.; Wang, C. H.; Wang, M. -Z.; Wang, P.; Wang, X. L.; Watanabe, M.; Watanabe, Y.; Williams, K. M.; Won, E.; Yabsley, B. D.; Yamashita, Y.; Yashchenko, S.; Yook, Y.; Yuan, C. Z.; Zhang, Z. P.; Zhilich, V.; Zupanc, A.
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:We report an observation of the $B^{\\pm} \\to J/\\psi \\eta K^{\\pm}$ and $B^0 \\to J/\\psi \\eta K^0_S$ decays using 772$\\times 10^{6}$ $B\\bar{B}$ pairs collected at the $\\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We obtain the branching fractions ${\\cal B}(B^{\\pm}\\rightarrow J/\\psi\\eta K^{\\pm})=(1.27\\pm 0.11{\\rm (stat.)\\pm 0.11{\\rm (syst.)})}\\times10^{-4}$ and ${\\cal B}(B^0\\to J/\\psi \\eta K^0_S)=(5.22 \\pm 0.78 {\\rm(stat.)} \\pm 0.49{\\rm(syst.)})\\times10^{-5}$. We search for a new narrow charmonium(-like) state $X$ in the $J/\\psi \\eta$ mass spectrum and find no significant excess. We set upper limits on the product of branching fractions, ${\\cal B}(B^\\pm \\to XK^\\pm){\\cal B}(X \\to J/\\psi \\eta)$, at 3872 MeV$/c^2$ where a $C$-odd partner of X(3872) may exist, at $\\psi(4040)$ and $\\psi(4160)$ assuming their known mass and width, and over a range from 3.8 to 4.8 GeV$/c^2$. % at a 5 MeV$/c^2$ step. The obtained upper limits at 90% confidence level for $X^{C{\\rm -odd}}(3872)$, $\\psi(4040)$ and $\\psi(4160)$ are 3.8$\\times 10^{-6}$, 15.5$\\times 10^{-6}$ and 7.4$\\times 10^{-6}$, respectively.
Classification / Thesaurus:Belle II
Comment of the Author/Creator:Submitted to PTEP
Document Type:Article
Communicated by:MPI für Physik
Affiliations:MPI für Physik
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