Phys. Rev. Lett.
90,
121802
(2003)
[5 pages]
Observation of the Decay B̅ 0→Λc+p̅
N. Gabyshev et al. Belle Collaboration
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N. Gabyshev8, H. Kichimi8, K. Abe8, K. Abe41, R. Abe28, T. Abe42, I. Adachi8, H. Aihara43, M. Akatsu22, Y. Asano48, T. Aso47, V. Aulchenko1, T. Aushev12, A. M. Bakich38, Y. Ban32, E. Banas26, A. Bay18, I. Bedny1, I. Bizjak13, A. Bondar1, A. Bozek26, M. Bračko20,13, J. Brodzicka26, T. E. Browder7, B. C. K. Casey7, M.-C. Chang25, P. Chang25, Y. Chao25, K.-F. Chen25, B. G. Cheon37, R. Chistov12, S.-K. Choi6, Y. Choi37, Y. K. Choi37, M. Danilov12, L. Y. Dong10, J. Dragic21, A. Drutskoy12, S. Eidelman1, V. Eiges12, Y. Enari22, F. Fang7, C. Fukunaga45, A. Garmash1,8, T. Gershon8, B. Golob19,13, J. Haba8, C. Hagner50, F. Handa42, T. Hara30, K. Hasuko33, H. Hayashii23, M. Hazumi8, I. Higuchi42, L. Hinz18, T. Hojo30, T. Hokuue22, Y. Hoshi41, W.-S. Hou25, Y. B. Hsiung25, H.-C. Huang25, T. Igaki22, Y. Igarashi8, T. Iijima22, K. Inami22, A. Ishikawa22, R. Itoh8, H. Iwasaki8, Y. Iwasaki8, H. K. Jang36, J. H. Kang52, J. S. Kang15, P. Kapusta26, S. U. Kataoka23, N. Katayama8, H. Kawai2, H. Kawai43, T. Kawasaki28, D. W. Kim37, H. J. Kim52, H. O. Kim37, Hyunwoo Kim15, J. H. Kim37, S. K. Kim36, K. Kinoshita4, S. Kobayashi34, S. Korpar20,13, P. Križan19,13, P. Krokovny1, R. Kulasiri4, A. Kuzmin1, Y.-J. Kwon52, J. S. Lange5,33, G. Leder11, S. H. Lee36, J. Li35, S.-W. Lin25, D. Liventsev12, R.-S. Lu25, J. MacNaughton11, G. Majumder39, F. Mandl11, T. Matsuishi22, S. Matsumoto3, T. Matsumoto45, W. Mitaroff11, Y. Miyabayashi22, H. Miyake30, H. Miyata28, G. R. Moloney21, T. Mori3, T. Nagamine42, Y. Nagasaka9, T. Nakadaira43, E. Nakano29, M. Nakao8, J. W. Nam37, Z. Natkaniec26, S. Nishida16, O. Nitoh46, S. Noguchi23, T. Nozaki8, S. Ogawa40, T. Ohshima22, T. Okabe22, S. Okuno14, S. L. Olsen7, Y. Onuki28, W. Ostrowicz26, H. Ozaki8, P. Pakhlov12, H. Palka26, C. W. Park15, H. Park17, K. S. Park37, L. S. Peak38, J.-P. Perroud18, L. E. Piilonen50, M. Rozanska26, K. Rybicki26, H. Sagawa8, S. Saitoh8, Y. Sakai8, T. R. Sarangi49, M. Satapathy49, A. Satpathy8,4, O. Schneider18, S. Schrenk4, J. Schümann25, A. J. Schwartz4, S. Semenov12, K. Senyo22, R. Seuster7, M. E. Sevior21, H. Shibuya40, B. Shwartz1, V. Sidorov1, J. B. Singh31, N. Soni31, S. Stanič48,*, M. Starič13, A. Sugi22, A. Sugiyama22, K. Sumisawa8, T. Sumiyoshi45, S. Suzuki51, S. Y. Suzuki8, S. K. Swain7, T. Takahashi29, F. Takasaki8, K. Tamai8, N. Tamura28, J. Tanaka43, M. Tanaka8, G. N. Taylor21, Y. Teramoto29, S. Tokuda22, T. Tomura43, T. Tsuboyama8, T. Tsukamoto8, S. Uehara8, Y. Unno2, S. Uno8, G. Varner7, K. E. Varvell38, C. C. Wang25, C. H. Wang24, J. G. Wang50, M.-Z. Wang25, Y. Watanabe44, E. Won15, B. D. Yabsley50, Y. Yamada8, A. Yamaguchi42, Y. Yamashita27, Y. Yamashita43, M. Yamauchi8, H. Yanai28, Y. Yuan10, Y. Yusa42, C. C. Zhang10, Z. P. Zhang35, Y. Zheng7, V. Zhilich1, and D. Žontar19,13 (Belle Collaboration)
1Budker Institute of Nuclear Physics, Novosibirsk,
2Chiba University, Chiba
3Chuo University, Tokyo
4University of Cincinnati, Cincinnati, Ohio 45221
5University of Frankfurt, Frankfurt
6Gyeongsang National University, Chinju
7University of Hawaii, Honolulu, Hawaii 96822
8High Energy Accelerator Research Organization (KEK), Tsukuba
9Hiroshima Institute of Technology, Hiroshima
10Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
11Institute of High Energy Physics, Vienna
12Institute for Theoretical and Experimental Physics, Moscow
13J. Stefan Institute, Ljubljana
14Kanagawa University, Yokohama
15Korea University, Seoul
16Kyoto University, Kyoto
17Kyungpook National University, Taegu
18Institut de Physique des Hautes Énergies, Université de Lausanne, Lausanne
19University of Ljubljana, Ljubljana
20University of Maribor, Maribor
21University of Melbourne, Victoria
22Nagoya University, Nagoya
23Nara Women’s University, Nara
24National Lien-Ho Institute of Technology, Miao Li
25National Taiwan University, Taipei
26H. Niewodniczanski Institute of Nuclear Physics, Krakow
27Nihon Dental College, Niigata
28Niigata University, Niigata
29Osaka City University, Osaka
30Osaka University, Osaka
31Panjab University, Chandigarh
32Peking University, Beijing
33RIKEN BNL Research Center, Upton, New York 11973
34Saga University, Saga
35University of Science and Technology of China, Hefei
36Seoul National University, Seoul
37Sungkyunkwan University, Suwon
38University of Sydney, Sydney New South Wales
39Tata Institute of Fundamental Research, Bombay
40Toho University, Funabashi
41Tohoku Gakuin University, Tagajo
42Tohoku University, Sendai
43University of Tokyo, Tokyo
44Tokyo Institute of Technology, Tokyo
45Tokyo Metropolitan University, Tokyo
46Tokyo University of Agriculture and Technology, Tokyo
47Toyama National College of Maritime Technology, Toyama
48University of Tsukuba, Tsukuba
49Utkal University, Bhubaneswer
50Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
51Yokkaichi University, Yokkaichi
52Yonsei University, Seoul
Received 20 December 2002; published 26 March 2003
We report the measurement of the charmed baryonic decay B̅ 0→Λc+p̅ with a branching fraction of (2.19-0.49+0.56±0.32±0.57)×10-5 and a statistical significance of 5.8 σ. The errors are statistical, systematic, and the error of the Λc+→pK-π+ decay branching fraction. This is the first observation of a two-body baryonic B decay. The analysis is based on 78.2 fb-1 of data accumulated at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric e+e- collider.
© 2003 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.121802
DOI:
10.1103/PhysRevLett.90.121802
*On leave from Nova Gorica Polytechnic, Nova Gorica.
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