Evidence of gamma(1S) -> J/Psi +chi(c1) and search for double-charmonium production in gamma(1S) and gamma(2S) decays

Yang, S. D. ; Shen, C. P. ; Ban, Y. ; Abdesselam, A. ; Adachi, I. ; Aihara, H. ; Al Said, S. ; Arinstein, K. ; Asner, D. M. ; Aulchenko, V. ; Aushev, T. ; Ayad, R. ; Bakich, A. M. ; Bansal, V. ; Behera, P. ; Bhuyan, B. ; Bobrov, A. ; Bozek, A. ; Bracko, M. ; Browder, T. E. ; Cervenkov, D. ; Chekelian, V. ; Chen, A. ; Cheon, B. G. ; Chilikin, K. ; Chistov, R. ; Cho, K. ; Chobanova, V. ; Choi, S. -K. ; Choi, Y. ; Cinabro, D. ; Dalseno, J. ; Danilov, M. ; Dingfelder, J. ; Dolezal, Z. ; Drasal, Z. ; Drutskoy, A. ; Dutta, K. ; Eidelman, S. ; Farhat, H. ; Fast, J. E. ; Ferber, T. ; Gaur, V. ; Gabyshev, N. ; Ganguly, S. ; Garmash, A. ; Gillard, R. ; Goh, Y. M. ; Golob, B. ; Haba, J. ; Hara, T. ; Hayasaka, K. ; Hayashii, H. ; He, X. H. ; Hou, W. -S. ; Huschle, M. ; Iijima, T. ; Inami, K. ; Ishikawa, A. ; Itoh, R. ; Jaegle, I. ; Joffe, D. ; Joo, K. K. ; Julius, T. ; Kawasaki, T. ; Kim, D. Y. ; Kim, H. J. ; Kim, J. B. ; Kim, J. H. ; Kim, K. T. ; Kinoshita, K. ; Ko, B. R. ; Kodys, P. ; Korpar, S. ; Krizan, P. ; Krokovny, P. ; Kuzmin, A. ; Kwon, Y. -J. ; Lange, J. S. ; Li, J. ; Li, Y. ; Gioi, L. Li ; Libby, J. ; Liventsev, D. ; Lukin, P. ; Miyabayashi, K. ; Miyata, H. ; Moll, A. ; Mussa, R. ; Nakano, E. ; Nakao, M. ; Nanut, T. ; Nisar, N. K. ; Nishida, S. ; Okuno, S. ; Ostrowicz, W. ; Park, C. W. ; Park, H. ; Pedlar, T. K. ; Pestotnik, R. ; Petric, M. ; Piilonen, L. E. ; Ribezl, E. ; Ritter, M. ; Rostomyan, A. ; Sakai, Y. ; Sandilya, S. ; Santelj, L. ; Sanuki, T. ; Schneider, O. ; Schnell, G. ; Schwanda, C. ; Semmler, D. ; Senyo, K. ; Shebalin, V. ; Shibata, T. -A. ; Shiu, J. -G. ; Shwartz, B. ; Sibidanov, A. ; Simon, F. ; Sohn, Y. -S. ; Sokolov, A. ; Staric, M. ; Steder, M. ; Sumiyoshi, T. ; Tamponi, U. ; Tanida, K. ; Tatishvili, G. ; Teramoto, Y. ; Uchida, M. ; Uehara, S. ; Uglov, T. ; Unno, Y. ; Uno, S. ; Urquijo, P. ; Usov, Y. ; Vahsen, S. E. ; Van Hulse, C. ; Vanhoefer, P. ; Varner, G. ; Vinokurova, A. ; Vorobyev, V. ; Vossen, A. ; Wagner, M. N. ; Wang, C. H. ; Wang, M. -Z. ; Wang, P. ; Wang, X. L. ; Watanabe, M. ; Watanabe, Y. ; Won, E. ; Yamaoka, J. ; Yashchenko, S. ; Yook, Y. ; Yuan, C. Z. ; Zhang, Z. P. ; Zhilich, V. ; Zhulanov, V. ; Belle Collaboration

Using data samples of 102 x 10(6) gamma(1S) and 158 x 10(6) gamma(2S) events collected with the Belle detector, a first experimental search has been made for double-charmonium production in the exclusive decays gamma(1S, 2S) --> J/psi(psi') + X, where X = eta(c).chi(cJ) (J = 0, 1, 2), eta(c)(2S), X(3940), and X(4160). No significant signal is observed in the spectra of the mass recoiling against the reconstructed J/psi or psi' except for the evidence of chi(c1) production with a significance of 4.6 sigma for gamma(1S) -> J/psi + chi(c1). The measured branching fraction B(gamma(1S) -> J/psi + chi(c1)) is [3.90 +/- 1.21 (stat) +/- 0.23(syst) x 10(-6). The 90% C.L. upper limits on the branching fractions of the other modes having a significance of less than 3 sigma are determined. These results are consistent with theoretical calculations using the nonrelativistic QCD factorization approach.


Published in:
Physical Review D, 90, 11, 112008
Year:
2014
Publisher:
College Pk, Amer Physical Soc
ISSN:
1550-7998
Laboratories:




 Record created 2015-04-13, last modified 2018-12-03


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