| Literature DB >> 18999743 |
G Pakhlova1, I Adachi, H Aihara, K Arinstein, V Aulchenko, T Aushev, A M Bakich, V Balagura, I Bedny, V Bhardwaj, U Bitenc, A Bondar, A Bozek, M Bracko, J Brodzicka, T E Browder, P Chang, A Chen, B G Cheon, C-C Chiang, R Chistov, I-S Cho, S-K Choi, Y Choi, J Dalseno, M Danilov, M Dash, S Eidelman, N Gabyshev, H Ha, J Haba, K Hayasaka, M Hazumi, D Heffernan, Y Hoshi, W-S Hou, Y B Hsiung, H J Hyun, T Iijima, K Inami, A Ishikawa, H Ishino, R Itoh, M Iwasaki, Y Iwasaki, D H Kah, J H Kang, N Katayama, H Kawai, T Kawasaki, H Kichimi, H J Kim, H O Kim, S K Kim, Y I Kim, Y J Kim, K Kinoshita, P Krizan, P Krokovny, R Kumar, A Kuzmin, Y-J Kwon, S-H Kyeong, J S Lange, J S Lee, S E Lee, T Lesiak, J Li, A Limosani, C Liu, D Liventsev, F Mandl, A Matyja, K Miyabayashi, H Miyata, Y Miyazaki, R Mizuk, T Mori, E Nakano, M Nakao, Z Natkaniec, S Nishida, O Nitoh, S Noguchi, S Ogawa, T Ohshima, S Okuno, S L Olsen, H Ozaki, P Pakhlov, H Palka, C W Park, H Park, H K Park, L S Peak, L E Piilonen, A Poluektov, H Sahoo, Y Sakai, O Schneider, K Senyo, M Shapkin, C P Shen, J-G Shiu, B Shwartz, J B Singh, A Sokolov, S Stanic, M Staric, T Sumiyoshi, M Tanaka, G N Taylor, Y Teramoto, I Tikhomirov, S Uehara, T Uglov, Y Unno, S Uno, P Urquijo, Y Usov, G Varner, C H Wang, M-Z Wang, P Wang, X L Wang, Y Watanabe, R Wedd, E Won, B D Yabsley, Y Yamashita, M Yamauchi, C Z Yuan, C C Zhang, Z P Zhang, V Zhilich, V Zhulanov, T Zivko, A Zupanc, O Zyukova.
Abstract
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.Year: 2008 PMID： 18999743 DOI： 10.1103/PhysRevLett.101.172001
Source DB: PubMed Journal: Phys Rev Lett ISSN： 0031-9007 Impact factor: 9.161