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arXiv · 1304.3975

Evidence of a new narrow resonance decaying to $\chi_{c1}\gamma$ in $B \to \chi_{c1} \gamma K$

Belle Collaboration·V. Bhardwaj·K. Miyabayashi·I. Adachi·H. Aihara·D. M. Asner·V. Aulchenko·T. Aushev·T. Aziz·A. M. Bakich·A. Bala·B. Bhuyan·M. Bischofberger·A. Bondar·G. Bonvicini·A. Bozek·M. Bračko·J. Brodzicka·T. E. Browder·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·Z. Drásal·A. Drutskoy·D. Dutta·K. Dutta·S. Eidelman·D. Epifanov·H. Farhat·J. E. Fast·T. Ferber·A. Frey·V. Gaur·N. Gabyshev·S. Ganguly·R. Gillard·Y. M. Goh·B. Golob·J. Haba·T. Hara·H. Hayashii·Y. Horii·Y. Hoshi·W. -S. Hou·Y. B. Hsiung·H. J. Hyun·T. Iijima·K. Inami·A. Ishikawa·R. Itoh·T. Iwashita·T. Julius·D. H. Kah·J. H. Kang·E. Kato·T. Kawasaki·H. Kichimi·C. Kiesling·D. Y. Kim·J. B. Kim·J. H. Kim·K. T. Kim·M. J. Kim·Y. J. Kim·K. Kinoshita·J. Klucar·B. R. Ko·P. Kodyš·S. Korpar·P. Križan·P. Krokovny·R. Kumar·T. Kumita·A. Kuzmin·Y. -J. Kwon·J. S. Lange·S. -H. Lee·J. Li·Y. Li·C. Liu·Z. Q. Liu·D. Liventsev·P. Lukin·D. Matvienko·H. Miyata·R. Mizuk·G. B. Mohanty·A. Moll·R. Mussa·E. Nakano
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Abstract

We report measurements of $B \to \chi_{c1} \gamma K$ and $\chi_{c2} \gamma K$ decays using $772 \times 10^{6}$ $B\bar{B}$ events collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. Evidence of a new resonance in the $\chi_{c1} \gamma$ final state is found with a statistical significance of $3.8 \sigma$. This state has a mass of $3823.1 \pm 1.8 {(stat)} \pm 0.7 {(syst)}$ MeV/$c^2$, a value that is consistent with theoretical expectations for the previously unseen $1^3 D_2$ $c\bar{c}$ meson. We find no other narrow resonance and set upper limits on the branching fractions of the $X(3872) \to \chi_{c1} \gamma$ and $\chi_{c2} \gamma$ decays.

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Belle Collaboration, V. Bhardwaj, K. Miyabayashi, I. Adachi, H. Aihara, D. M. Asner, V. Aulchenko, T. Aushev, T. Aziz, A. M. Bakich, A. Bala, B. Bhuyan, M. Bischofberger, A. Bondar, G. Bonvicini, A. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, 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, Z. Drásal, A. Drutskoy, D. Dutta, K. Dutta, S. Eidelman, D. Epifanov, H. Farhat, J. E. Fast, T. Ferber, A. Frey, V. Gaur, N. Gabyshev, S. Ganguly, R. Gillard, Y. M. Goh, B. Golob, J. Haba, T. Hara, H. Hayashii, Y. Horii, Y. Hoshi, W. -S. Hou, Y. B. Hsiung, H. J. Hyun, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, T. Iwashita, T. Julius, D. H. Kah, J. H. Kang, E. Kato, T. Kawasaki, H. Kichimi, C. Kiesling, D. Y. Kim, J. B. Kim, J. H. Kim, K. T. Kim, M. J. Kim, Y. J. Kim, K. Kinoshita, J. Klucar, B. R. Ko, P. Kodyš, S. Korpar, P. Križan, P. Krokovny, R. Kumar, T. Kumita, A. Kuzmin, Y. -J. Kwon, J. S. Lange, S. -H. Lee, J. Li, Y. Li, C. Liu, Z. Q. Liu, D. Liventsev, P. Lukin, D. Matvienko, H. Miyata, R. Mizuk, G. B. Mohanty, A. Moll, R. Mussa, E. Nakano. 2013-04-15. Evidence of a new narrow resonance decaying to $\chi_{c1}\gamma$ in $B \to \chi_{c1} \gamma K$. https://doi.org/10.1103/physrevlett.111.032001

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