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

A. Bala; A. Bondar; A. Bozek; A. Chen; A. Drutskoy; A. Frey; A. Ishikawa; A. Kuzmin; A. M. Bakich; A. Moll

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arxiv 1304.3975 v2 pith:PJPWROW7 submitted 2013-04-15 hep-ex

Evidence of a new narrow resonance decaying to chi_(c1)γ in B to chi_(c1) γ K

Belle Collaboration: V. Bhardwaj , K. Miyabayashi , I. Adachi , H. Aihara , D. M. Asner , V. Aulchenko , T. Aushev , T. Aziz

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A. M. Bakich A. Bala B. Bhuyan M. Bischofberger A. Bondar G. Bonvicini A. Bozek M. Bra\v{c}ko 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. Dole\v{z}al Z. Dr\'asal 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. Kody\v{s} S. Korpar P. Kri\v{z}an 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 M. Nakao Z. Natkaniec M. Nayak E. Nedelkovska N. K. Nisar S. Nishida O. Nitoh S. Ogawa S. Okuno S. L. Olsen P. Pakhlov G. Pakhlova E. Panzenb\"ock H. Park H. K. Park T. K. Pedlar R. Pestotnik M. Petri\v{c} L. E. Piilonen M. Ritter M. R\"ohrken A. Rostomyan H. Sahoo T. Saito K. Sakai Y. Sakai S. Sandilya D. Santel L. Santelj T. Sanuki Y. Sato V. Savinov O. Schneider G. Schnell C. Schwanda R. Seidl D. Semmler K. Senyo O. Seon M. E. Sevior M. Shapkin C. P. Shen T.-A. Shibata J.-G. Shiu B. Shwartz F. Simon J. B. Singh P. Smerkol Y.-S. Sohn A. Sokolov E. Solovieva M. Stari\v{c} M. Steder M. Sumihama T. Sumiyoshi U. Tamponi K. Tanida G. Tatishvili Y. Teramoto K. Trabelsi T. Tsuboyama M. Uchida S. Uehara T. Uglov Y. Unno P. Urquijo Y. Usov S. E. Vahsen C. Van Hulse P. Vanhoefer G. Varner K. E. Varvell A. Vinokurova M. N. Wagner C. H. Wang M.-Z. Wang P. Wang M. Watanabe Y. Watanabe E. Won B. D. Yabsley J. Yamaoka Y. Yamashita S. Yashchenko Y. Yook C. Z. Yuan C. C. Zhang Z. P. Zhang V. Zhilich V. Zhulanov A. Zupanc

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keywords gammaresonancedecaysevidencenarrowstateasymmetric-energybelle

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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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