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arXiv · 1605.00990

Search for $XYZ$ states in $\Upsilon(1S)$ inclusive decays

Belle Collaboration·C. P. Shen·C. Z. Yuan·Y. Ban·H. Aihara·D. M. Asner·I. Badhrees·A. M. Bakich·E. Barberio·P. Behera·V. Bhardwaj·B. Bhuyan·J. Biswal·A. Bondar·G. Bonvicini·A. Bozek·M. Bračko·T. E. Browder·D. Červenkov·V. Chekelian·A. Chen·K. Chilikin·R. Chistov·K. Cho·V. Chobanova·S. -K. Choi·Y. Choi·D. Cinabro·J. Dalseno·M. Danilov·N. Dash·S. Di Carlo·Z. Doležal·Z. Drásal·D. Dutta·S. Eidelman·H. Farhat·J. E. Fast·T. Ferber·B. G. Fulsom·V. Gaur·N. Gabyshev·A. Garmash·P. Goldenzweig·J. Haba·K. Hayasaka·H. Hayashii·W. -S. Hou·T. Iijima·G. Inguglia·A. Ishikawa·R. Itoh·W. W. Jacobs·H. B. Jeon·K. K. Joo·T. Julius·K. H. Kang·D. Y. Kim·J. B. Kim·K. T. Kim·S. H. Kim·Y. J. Kim·K. Kinoshita·P. Kodyš·S. Korpar·D. Kotchetkov·P. Križan·P. Krokovny·T. Kuhr·A. Kuzmin·Y. -J. Kwon·J. S. Lange·C. H. Li·H. Li·L. Li·Y. Li·L. Li Gioi·J. Libby·D. Liventsev·T. Luo·M. Masuda·T. Matsuda·D. Matvienko·A. Moll·H. K. Moon·R. Mussa·M. Nakao·T. Nanut·K. J. Nath·Z. Natkaniec·M. Nayak·K. Negishi·S. Nishida·S. Ogawa·S. Okuno·S. L. Olsen·P. Pakhlov·G. Pakhlova·B. Pal·R. Pestotnik
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Abstract

The branching fractions of the $\Upsilon(1S)$ inclusive decays into final states with a $J/\psi$ or a $\psi(2S)$ are measured with improved precision to be $\BR(\Upsilon(1S)\to J/\psi + {\rm anything})=(5.25\pm 0.13(\mathrm{stat.})\pm 0.25(\mathrm{syst.}))\times 10^{-4}$ and $\BR(\Upsilon(1S)\to \psi(2S) + {\rm anything})=(1.23\pm 0.17(\mathrm{stat.})\pm 0.11(\mathrm{syst.}))\times 10^{-4}$. The first search for $\Upsilon(1S)$ decays into $XYZ$ states that decay into a $J/\psi$ or a $\psi(2S)$ plus one or two charged tracks yields no significant signals for $XYZ$ states in any of the examined decay modes, and upper limits on their production rates in $\Upsilon(1S)$ inclusive decays are determined.

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Belle Collaboration, C. P. Shen, C. Z. Yuan, Y. Ban, H. Aihara, D. M. Asner, I. Badhrees, A. M. Bakich, E. Barberio, P. Behera, V. Bhardwaj, B. Bhuyan, J. Biswal, A. Bondar, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, V. Chekelian, A. Chen, K. Chilikin, R. Chistov, K. Cho, V. Chobanova, S. -K. Choi, Y. Choi, D. Cinabro, J. Dalseno, M. Danilov, N. Dash, S. Di Carlo, Z. Doležal, Z. Drásal, D. Dutta, S. Eidelman, H. Farhat, J. E. Fast, T. Ferber, B. G. Fulsom, V. Gaur, N. Gabyshev, A. Garmash, P. Goldenzweig, J. Haba, K. Hayasaka, H. Hayashii, W. -S. Hou, T. Iijima, G. Inguglia, A. Ishikawa, R. Itoh, W. W. Jacobs, H. B. Jeon, K. K. Joo, T. Julius, K. H. Kang, D. Y. Kim, J. B. Kim, K. T. Kim, S. H. Kim, Y. J. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Križan, P. Krokovny, T. Kuhr, A. Kuzmin, Y. -J. Kwon, J. S. Lange, C. H. Li, H. Li, L. Li, Y. Li, L. Li Gioi, J. Libby, D. Liventsev, T. Luo, M. Masuda, T. Matsuda, D. Matvienko, A. Moll, H. K. Moon, R. Mussa, M. Nakao, T. Nanut, K. J. Nath, Z. Natkaniec, M. Nayak, K. Negishi, S. Nishida, S. Ogawa, S. Okuno, S. L. Olsen, P. Pakhlov, G. Pakhlova, B. Pal, R. Pestotnik. 2016-05-03. Search for $XYZ$ states in $\Upsilon(1S)$ inclusive decays. https://doi.org/10.1103/physrevd.93.112013

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