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arXiv · 1310.2704

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

Belle Collaboration·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. Cho·V. 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. Kodyš·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
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Abstract

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.

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Belle Collaboration, 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. Cho, V. 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. Kodyš, 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. 2013-10-10. 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. https://doi.org/10.1093/ptep/ptu043

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