Evidence of (1S) →j /ψ+χc1 and search for double-charmonium production in (1S) and (2S) decays

Date Issued
16-12-2014
Author(s)
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.
BraÄ ko, M.
Browder, T. E.
ÄŒervenkov, 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.
DoleŽal, Z.
Drásal, 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.
Kodyš, P.
Korpar, S.
KriŽan, P.
Krokovny, P.
Kuzmin, A.
Kwon, Y. J.
Lange, J. S.
Li, J.
Li, Y.
Li Gioi, L.
Indian Institute of Technology, Madras
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.
DOI
Abstract
Using data samples of 102×106 (1S) and 158×106 (2S) events collected with the Belle detector, a first experimental search has been made for double-charmonium production in the exclusive decays (1S,2S)→J/ψ(ψ′)+X, where X=ηc, χcJ(J=0,1,2), ηc(2S), X(3940), and X(4160). No significant signal is observed in the spectra of the mass recoiling against the reconstructed J/ψ or ψ′ except for the evidence of χc1 production with a significance of 4.6σ for (1S)→J/ψ+χc1. The measured branching fraction B((1S)→J/ψ+χc1) is [3.90±1.21(stat)±0.23(syst)]×10-6. The 90% C.L. upper limits on the branching fractions of the other modes having a significance of less than 3σ are determined. These results are consistent with theoretical calculations using the nonrelativistic QCD factorization approach.
Volume
90