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arXiv · 1512.02672

Inclusive and exclusive measurements of $B$ decays to $\chi_{c1}$ and $\chi_{c2}$ at Belle

V. Bhardwaj·K. Miyabayashi·E. Panzenböck·K. Trabelsi·A. Frey·A. Abdesselam·I. Adachi·H. Aihara·S. Al Said·K. Arinstein·D. M. Asner·H. Atmacan·V. Aulchenko·T. Aushev·R. Ayad·V. Babu·I. Badhrees·S. Bahinipati·A. M. Bakich·A. Bala·V. Bansal·E. Barberio·B. Bhuyan·J. Biswal·A. Bobrov·A. Bondar·A. Bozek·M. Bračko·T. E. Browder·D. Červenkov·V. Chekelian·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·D. Dutta·S. Eidelman·H. Farhat·J. E. Fast·T. Ferber·O. Frost·B. G. Fulsom·V. Gaur·N. Gabyshev·S. Ganguly·A. Garmash·R. Gillard·R. Glattauer·Y. M. Goh·P. Goldenzweig·B. Golob·D. Greenwald·J. Haba·P. Hamer·K. Hayasaka·H. Hayashii·X. H. He·W. -S. Hou·T. Iijima·K. Inami·A. Ishikawa·R. Itoh·Y. Iwasaki·I. Jaegle·D. Joffe·K. K. Joo·T. Julius·E. Kato·P. Katrenko·T. Kawasaki·C. Kiesling·D. Y. Kim·J. B. Kim·K. T. Kim·M. J. Kim·S. H. Kim·Y. J. Kim·K. Kinoshita·B. R. Ko·N. Kobayashi·P. Kodyš·S. Korpar·P. Križan·P. Krokovny·T. Kuhr·R. Kumar·T. Kumita·A. Kuzmin·Y. -J. Kwon·I. S. Lee·C. Li·Y. Li
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Abstract

We report inclusive and exclusive measurements for $\chi_{c1}$ and $\chi_{c2}$ production in $B$ decays. We measure $\mathcal{B}(B \to \chi_{c1} X)$= $(3.03 \pm 0.05(\mbox{stat}) \pm 0.24(\mbox{syst})) \times 10^{-3}$ and $\mathcal{B}(B \to \chi_{c2} X)$= $(0.70 \pm 0.06(\mbox{stat}) \pm 0.10(\mbox{syst})) \times 10^{-3}$. For the first time, $\chi_{c2}$ production in exclusive $B$ decays in the modes $B^0 \to \chi_{c2}\pi^- K^+$ and $B^+ \to \chi_{c2} \pi^+ \pi^- K^+$ has been observed, along with first evidence for the $B^+ \to \chi_{c2} \pi^+ K_S^0$ decay mode. For $\chi_{c1}$ production, we report the first observation in the $B^+ \to \chi_{c1} \pi^+ \pi^- K^+$, $B^0 \to \chi_{c1} \pi^+ \pi^- K_S^0$ and $B^0 \to \chi_{c1} \pi^0 \pi^- K^+$ decay modes. Using these decay modes, we observe a difference in the production mechanism of $\chi_{c2}$ in comparison to $\chi_{c1}$ in $B$ decays. In addition, we report searches for $X(3872)$ and $\chi_{c1}(2P)$ in the $B^+ \to (\chi_{c1} \pi^+ \pi^-) K^+$ decay mode. The reported results use $772 \times 10^{6}$ $B\overline{B}$ events collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider.

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V. Bhardwaj, K. Miyabayashi, E. Panzenböck, K. Trabelsi, A. Frey, A. Abdesselam, I. Adachi, H. Aihara, S. Al Said, K. Arinstein, D. M. Asner, H. Atmacan, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, I. Badhrees, S. Bahinipati, A. M. Bakich, A. Bala, V. Bansal, E. Barberio, B. Bhuyan, J. Biswal, A. Bobrov, A. Bondar, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, V. Chekelian, 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, D. Dutta, S. Eidelman, H. Farhat, J. E. Fast, T. Ferber, O. Frost, B. G. Fulsom, V. Gaur, N. Gabyshev, S. Ganguly, A. Garmash, R. Gillard, R. Glattauer, Y. M. Goh, P. Goldenzweig, B. Golob, D. Greenwald, J. Haba, P. Hamer, K. Hayasaka, H. Hayashii, X. H. He, W. -S. Hou, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, Y. Iwasaki, I. Jaegle, D. Joffe, K. K. Joo, T. Julius, E. Kato, P. Katrenko, T. Kawasaki, C. Kiesling, D. Y. Kim, J. B. Kim, K. T. Kim, M. J. Kim, S. H. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, N. Kobayashi, P. Kodyš, S. Korpar, P. Križan, P. Krokovny, T. Kuhr, R. Kumar, T. Kumita, A. Kuzmin, Y. -J. Kwon, I. S. Lee, C. Li, Y. Li. 2015-12-08. Inclusive and exclusive measurements of $B$ decays to $\chi_{c1}$ and $\chi_{c2}$ at Belle. https://doi.org/10.1103/physrevd.93.052016

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