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Pakhlova, G; Aihara, H; Arinstein, K; Aulchenko, V; Aushev, T; Bakich, A M; Balagura, V; Bedny, I; Bhardwaj, V; Bitenc, U; Bondar, A; Bracko, M; Brodzicka, J; Browder, T E; Chang, P; Chiang, C-C; Dalseno, J; Danilov, M; Dash, M; Gabyshev, N; Haba, J; Hayasaka, K; Hazumi, M; Heffernan, D; Hoshi, Y; Hou, W-S; Hsiung, Y B; Iijima, T; Inami, K; Ishikawa, A; Ishino, H; Iwasaki, M; Iwasaki, Y; Kah, D H; Kang, J H; Kawai, H; Kawasaki, T; Kim, H J; Kim, H O; Kim, S K; Kim, Y I; Kim, Y J; Kinoshita, K; Kumar, R; Kuzmin, A; Kwon, Y-J; Lange, J S; Lee, J S; Lesiak, T; Limosani, A; Liu, C; Liventsev, D; Mandl, F; Matyja, A; Miyazaki, Y; Mizuk, R; Nakano, E; Nakao, M; Natkaniec, Z; Nishida, S; Nitoh, O; Noguchi, S; Ogawa, S; Ohshima, T; Olsen, S L; Ozaki, H; Palka, H; Park, C W; Park, H; Park, H K; Peak, L S; Poluektov, A; Sahoo, H; Sakai, Y; Schneider, O; Senyo, K; Shen, C P; Shiu, J-G; Shwartz, B; Sokolov, A; Stanic, S; Staric, M; Sumiyoshi, T; Taylor, G N; Tikhomirov, I; Uglov, T; Uno, S; Urquijo, P; Usov, Y; Varner, G; Wang, C H; Wang, M-Z; Wang, X L; Wedd, R; Won, E; Yabsley, B D; Yamauchi, M; Zhang, Z P; Zhulanov, V; Zupanc, A
Physical review letters, 2008-Oct-24, 20081024, Letnik: 101, Številka: 17Journal Article
We report a measurement of the exclusive e+ e- -->Lambda+_(c)Lambda-_(c) cross section as a function of center-of-mass energy near the Lambda+_(c)Lambda-_(c) threshold. A clear peak with a significance of 8.2sigma is observed in the Lambda+_(c)Lambda-_(c) invariant mass distribution just above threshold. With an assumption of a resonance origin for the observed peak, a mass and width of M=4634 (+8)_(-7)(stat)(+5)_(-8)(syst) MeV/c(2) and Gamma_(tot)=92 (+40)_(-24)(stat)(+10)_(-21)(syst) MeV are determined. The analysis is based on a study of events with initial-state-radiation photons in a data sample collected with the Belle detector at the Upsilon(4S) resonance and nearby continuum with an integrated luminosity of 695 fb(-1) at the KEKB asymmetric-energy e+ e- collider.
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