Phys. Rev. D
77,
051101(R)
(2008)
[6 pages]
Search for B̅ 0→Λc+Λ̅ c- decay at Belle
Y. Uchida et al. Belle Collaboration
Show All Authors/Affiliations
Hide All Authors/Affiliations
Y. Uchida5, H. Ozaki6, H. Kichimi6, I. Adachi6, H. Aihara7, K. Arinstein1, T. Aushev8,9, A. M. Bakich10, V. Balagura9, E. Barberio11, A. Bay8, K. Belous12, V. Bhardwaj13, U. Bitenc14, A. Bondar1, A. Bozek15, M. Bračko14,16, T. E. Browder17, M.-C. Chang4, Y. Chao18, A. Chen19, W. T. Chen19, B. G. Cheon20, R. Chistov9, I.-S. Cho21, Y. Choi22, J. Dalseno11, M. Dash23, A. Drutskoy3, S. Eidelman1, N. Gabyshev1, B. Golob14,24, H. Ha25, J. Haba6, K. Hayasaka26, M. Hazumi6, D. Heffernan27, Y. Hoshi28, W.-S. Hou18, Y. B. Hsiung18, H. J. Hyun29, K. Ikado26, K. Inami26, A. Ishikawa30, R. Itoh6, M. Iwabuchi5, M. Iwasaki7, Y. Iwasaki6, D. H. Kah29, H. Kaji26, J. H. Kang21, N. Katayama6, H. Kawai2, T. Kawasaki31, Y. J. Kim5, K. Kinoshita3, S. Korpar14,16, P. Križan14,24, P. Krokovny6, C. C. Kuo19, A. Kuzmin1, Y.-J. Kwon21, J. S. Lee22, M. J. Lee32, S. E. Lee32, T. Lesiak15, S.-W. Lin18, D. Liventsev9, F. Mandl33, S. McOnie10, T. Medvedeva9, W. Mitaroff33, H. Miyake27, H. Miyata31, Y. Miyazaki26, R. Mizuk9, G. R. Moloney11, Y. Nagasaka34, E. Nakano35, M. Nakao6, H. Nakazawa19, Z. Natkaniec15, S. Nishida6, O. Nitoh36, T. Nozaki6, S. Ogawa37, T. Ohshima26, S. Okuno38, S. L. Olsen17,39, P. Pakhlov9, G. Pakhlova9, C. W. Park22, H. Park29, L. S. Peak10, R. Pestotnik14, L. E. Piilonen23, Y. Sakai6, O. Schneider8, K. Senyo26, M. E. Sevior11, M. Shapkin12, C. P. Shen39, H. Shibuya37, J.-G. Shiu18, B. Shwartz1, J. B. Singh13, A. Somov3, S. Stanič40, M. Starič14, T. Sumiyoshi41, S. Y. Suzuki6, F. Takasaki6, M. Tanaka6, G. N. Taylor11, Y. Teramoto35, I. Tikhomirov9, K. Ueno18, T. Uglov9, Y. Unno20, S. Uno6, P. Urquijo11, Y. Usov1, G. Varner17, K. Vervink8, C. C. Wang18, C. H. Wang42, M.-Z. Wang18, P. Wang39, Y. Watanabe38, R. Wedd11, E. Won25, Y. Yamashita43, M. Yamauchi6, C. C. Zhang39, Z. P. Zhang44, V. Zhulanov1, A. Zupanc14, and O. Zyukova1 (Belle Collaboration)
1Budker Institute of Nuclear Physics, Novosibirsk
2Chiba University, Chiba
3University of Cincinnati, Cincinnati, Ohio 45221
4Department of Physics, Fu Jen Catholic University, Taipei
5The Graduate University for Advanced Studies, Hayama
6High Energy Accelerator Research Organization (KEK), Tsukuba
7Department of Physics, University of Tokyo, Tokyo
8École Polytechnique Fédérale de Lausanne (EPFL), Lausanne
9Institute for Theoretical and Experimental Physics, Moscow
10University of Sydney, Sydney, New South Wales
11University of Melbourne, School of Physics, Victoria 3010
12Institute of High Energy Physics, Protvino
13Panjab University, Chandigarh
14J. Stefan Institute, Ljubljana
15H. Niewodniczanski Institute of Nuclear Physics, Krakow
16University of Maribor, Maribor
17University of Hawaii, Honolulu, Hawaii 96822
18Department of Physics, National Taiwan University, Taipei
19National Central University, Chung-li
20Hanyang University, Seoul
21Yonsei University, Seoul
22Sungkyunkwan University, Suwon
23Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
24University of Ljubljana, Ljubljana
25Korea University, Seoul
26Nagoya University, Nagoya
27Osaka University, Osaka
28Tohoku Gakuin University, Tagajo
29Kyungpook National University, Taegu
30Saga University, Saga
31Niigata University, Niigata
32Seoul National University, Seoul
33Institute of High Energy Physics, Vienna
34Hiroshima Institute of Technology, Hiroshima
35Osaka City University, Osaka
36Tokyo University of Agriculture and Technology, Tokyo
37Toho University, Funabashi
38Kanagawa University, Yokohama
39Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
40University of Nova Gorica, Nova Gorica
41Tokyo Metropolitan University, Tokyo
42National United University, Miao Li
43Nippon Dental University, Niigata
44University of Science and Technology of China, Hefei
Received 5 October 2007; published 6 March 2008
We search for the doubly charmed baryonic decay B̅ 0→Λc+Λ̅ c-, in a data sample of 520×106 BB̅ events accumulated at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We find no significant signal and set an upper limit of B(B̅ 0→Λc+Λ̅ c-)<6.2×10-5 at 90% confidence level. The result is significantly below a naive extrapolation from B(B-→Ξc0Λ̅ c-) assuming a simple Cabibbo-suppression factor of |Vcd/Vcs|2. The small branching fraction may be attributed to a suppression due to the large momentum of the baryonic decay products, which has been observed in other charmed baryonic two-body B decays.
© 2008 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.77.051101
DOI:
10.1103/PhysRevD.77.051101
|
|
