Evidence of (1S) →j /ψ+χc1 and search for double-charmonium production in (1S) and (2S) decays
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.
Yang, SD; Shen, CP; Ban, Y; Abdesselam, A; Adachi, I; Aihara, H; Al Said, S; Arinstein, K; Asner, DM; Aulchenko, V; Aushev, T; Ayad, R; Bakich, AM; Bansal, V; Behera, P; Bhuyan, B; Bobrov, A; Bozek, A; Bračko, M; Browder, TE; Červenkov, D; Chekelian, V; Chen, A; Cheon, BG; Chilikin, K; Chistov, R; Cho, K; Chobanova, V; Choi, SK; Choi, Y; Cinabro, D; Dalseno, J; Danilov, M; Dingfelder, J; DoleŽal, Z; Drásal, Z; Drutskoy, A; Dutta, K; Eidelman, S; Farhat, H; Fast, JE; Ferber, T; Gaur, V; Gabyshev, N; Ganguly, S; Garmash, A; Gillard, R; Goh, YM; Golob, B; Haba, J; Hara, T; Hayasaka, K; Hayashii, H; He, XH; Hou, WS; Huschle, M; Iijima, T; Inami, K; Ishikawa, A; Itoh, R; Jaegle, I; Joffe, D; Joo, KK; Julius, T; Kawasaki, T; Kim, DY; Kim, HJ; Kim, JB; Kim, JH; Kim, KT; Kinoshita, K; Ko, BR; Kodyš, P; Korpar, S; KriŽan, P; Krokovny, P; Kuzmin, A; Kwon, YJ; Lange, JS; Li, J; Li, Y; Li Gioi, L; Libby, J; Liventsev, D; Lukin, P; Miyabayashi, K; Miyata, H; Moll, A; Mussa, R; Nakano, E; Nakao, M; Nanut, T; Nisar, NK; Nishida, S; Okuno, S; Ostrowicz, W; Park, CW; Park, H; Pedlar, TK; Pestotnik, R
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