Phys. Rev. Lett.
95,
061802
(2005)
[5 pages]
Observation of B+→pΛ̅ γ
Y.-J. Lee et al. Belle Collaboration
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Y.-J. Lee23, M.-Z. Wang23, K. Abe7, K. Abe38, H. Aihara40, Y. Asano44, V. Aulchenko1, T. Aushev11, S. Bahinipati4, A. M. Bakich35, I. Bedny1, U. Bitenc12, I. Bizjak12, A. Bondar1, A. Bozek24, M. Bračko7,17,12, J. Brodzicka24, T. E. Browder6, M.-C. Chang23, P. Chang23, Y. Chao23, A. Chen21, K.-F. Chen23, W. T. Chen21, B. G. Cheon3, R. Chistov11, S.-K. Choi5, A. Chuvikov31, S. Cole35, J. Dalseno18, M. Danilov11, M. Dash45, A. Drutskoy4, S. Eidelman1, Y. Enari19, F. Fang6, S. Fratina12, N. Gabyshev1, A. Garmash31, T. Gershon7, G. Gokhroo36, B. Golob16,12, A. Gorišek12, J. Haba7, K. Hayasaka19, M. Hazumi7, L. Hinz15, T. Hokuue19, Y. Hoshi38, S. Hou21, W.-S. Hou23, Y. B. Hsiung23, T. Iijima19, A. Imoto20, K. Inami19, A. Ishikawa7, R. Itoh7, M. Iwasaki40, Y. Iwasaki7, J. H. Kang46, J. S. Kang13, P. Kapusta24, N. Katayama7, H. Kawai2, T. Kawasaki26, H. R. Khan41, H. Kichimi7, H. J. Kim14, S. K. Kim33, S. M. Kim34, K. Kinoshita4, S. Korpar17,12, P. Križan16,12, P. Krokovny1, S. Kumar29, C. C. Kuo21, A. Kuzmin1, Y.-J. Kwon46, G. Leder10, S. E. Lee33, T. Lesiak24, J. Li32, S.-W. Lin23, D. Liventsev11, F. Mandl10, T. Matsumoto42, A. Matyja24, W. Mitaroff10, H. Miyake28, H. Miyata26, R. Mizuk11, G. R. Moloney18, T. Nagamine39, Y. Nagasaka8, E. Nakano27, M. Nakao7, H. Nakazawa7, Z. Natkaniec24, S. Nishida7, O. Nitoh43, S. Ogawa37, T. Ohshima19, T. Okabe19, S. L. Olsen6, W. Ostrowicz24, H. Ozaki7, H. Palka24, C. W. Park34, N. Parslow35, L. S. Peak35, R. Pestotnik12, L. E. Piilonen45, N. Root1, M. Rozanska24, H. Sagawa7, Y. Sakai7, N. Sato19, T. Schietinger15, O. Schneider15, J. Schümann23, K. Senyo19, M. E. Sevior18, T. Shibata26, H. Shibuya37, B. Shwartz1, V. Sidorov1, J. B. Singh29, A. Somov4, R. Stamen7, S. Stanič44,*, M. Starič12, K. Sumisawa28, T. Sumiyoshi42, O. Tajima7, F. Takasaki7, K. Tamai7, N. Tamura26, M. Tanaka7, Y. Teramoto27, X. C. Tian30, T. Tsukamoto7, S. Uehara7, T. Uglov11, K. Ueno23, S. Uno7, P. Urquijo18, G. Varner6, K. E. Varvell35, S. Villa15, C. C. Wang23, C. H. Wang22, M. Watanabe26, Q. L. Xie9, A. Yamaguchi39, Y. Yamashita25, M. Yamauchi7, Heyoung Yang33, J. Ying30, C. C. Zhang9, L. M. Zhang32, Z. P. Zhang32, V. Zhilich1, D. Žontar16,12, and D. Zürcher15 (Belle Collaboration)
1Budker Institute of Nuclear Physics, Novosibirsk
2Chiba University, Chiba
3Chonnam National University, Kwangju
4University of Cincinnati, Cincinnati, Ohio 45221
5Gyeongsang National University, Chinju
6University of Hawaii, Honolulu, Hawaii 96822
7High Energy Accelerator Research Organization (KEK), Tsukuba
8Hiroshima Institute of Technology, Hiroshima
9Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
10Institute of High Energy Physics, Vienna
11Institute for Theoretical and Experimental Physics, Moscow
12J. Stefan Institute, Ljubljana
13Korea University, Seoul
14Kyungpook National University, Taegu
15Swiss Federal Institute of Technology of Lausanne, EPFL, Lausanne
16University of Ljubljana, Ljubljana
17University of Maribor, Maribor
18University of Melbourne, Victoria
19Nagoya University, Nagoya
20Nara Women’s University, Nara
21National Central University, Chung-li
22National United University, Miao Li
23Department of Physics, National Taiwan University, Taipei
24H. Niewodniczanski Institute of Nuclear Physics, Krakow
25Nihon Dental College, Niigata
26Niigata University, Niigata
27Osaka City University, Osaka
28Osaka University, Osaka
29Panjab University, Chandigarh
30Peking University, Beijing
31Princeton University, Princeton, New Jersey 08544
32University of Science and Technology of China, Hefei
33Seoul National University, Seoul
34Sungkyunkwan University, Suwon
35University of Sydney, Sydney, New South Wales
36Tata Institute of Fundamental Research, Bombay
37Toho University, Funabashi
38Tohoku Gakuin University, Tagajo
39Tohoku University, Sendai
40Department of Physics, University of Tokyo, Tokyo
41Tokyo Institute of Technology, Tokyo
42Tokyo Metropolitan University, Tokyo
43Tokyo University of Agriculture and Technology, Tokyo
44University of Tsukuba, Tsukuba
45Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
46Yonsei University, Seoul
Received 21 March 2005; published 5 August 2005
We report the first observation of the radiative hyperonic B decay B+→pΛ̅ γ, using a 140 fb-1 data sample recorded on the Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. The measured branching fraction is B(B+→pΛ̅ γ)=(2.16-0.53+0.58±0.20)×10-6. We examine its MpΛ̅ distribution and observe a peak near threshold. This feature is expected by the short-distance b→sγ transition. A search for B+→pΣ̅ 0γ yields no significant signal, and we set a 90% confidence-level upper limit on the branching fraction of B(B+→pΣ̅ 0γ)<4.6×10-6.
© 2005 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.061802
DOI:
10.1103/PhysRevLett.95.061802
PACS:
13.20.He, 13.25.Hw, 14.40.Nd
*On leave from Nova Gorica Polytechnic, Nova Gorica.
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