Phys. Rev. Lett.
94,
122002
(2005)
[5 pages]
Observation of an Isotriplet of Excited Charmed Baryons Decaying to Λc+π
R. Mizuk et al. Belle Collaboration
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R. Mizuk11, K. Abe7, K. Abe39, H. Aihara41, M. Akatsu20, Y. Asano44, V. Aulchenko1, T. Aushev11, A. M. Bakich36, V. Balagura11, Y. Ban31, S. Banerjee37, I. Bedny1, U. Bitenc12, I. Bizjak12, S. Blyth24, A. Bondar1, A. Bozek25, M. Bračko7,18,12, J. Brodzicka25, T. E. Browder6, Y. Chao24, A. Chen22, B. G. Cheon3, R. Chistov11, S.-K. Choi5, Y. Choi35, A. Chuvikov32, S. Cole36, J. Dalseno19, M. Danilov11, M. Dash45, J. Dragic19, A. Drutskoy4, S. Eidelman1, S. Fratina12, N. Gabyshev1, A. Garmash32, T. Gershon7, G. Gokhroo37, J. Haba7, N. C. Hastings7, K. Hayasaka20, H. Hayashii21, M. Hazumi7, T. Hokuue20, Y. Hoshi39, S. Hou22, W.-S. Hou24, Y. B. Hsiung24, T. Iijima20, A. Imoto21, K. Inami20, A. Ishikawa7, R. Itoh7, M. Iwasaki41, Y. Iwasaki7, J. H. Kang46, J. S. Kang14, P. Kapusta25, N. Katayama7, H. Kawai2, T. Kawasaki27, H. R. Khan42, H. Kichimi7, H. J. Kim15, J. H. Kim35, S. K. Kim34, S. M. Kim35, P. Koppenburg7, S. Korpar18,12, P. Križan17,12, P. Krokovny1, R. Kulasiri4, C. C. Kuo22, A. Kuzmin1, Y.-J. Kwon46, S. E. Lee34, S. H. Lee34, T. Lesiak25, J. Li33, S.-W. Lin24, D. Liventsev11, G. Majumder37, F. Mandl10, T. Matsumoto43, W. Mitaroff10, H. Miyake29, H. Miyata27, D. Mohapatra45, T. Mori42, T. Nagamine40, Y. Nagasaka8, E. Nakano28, M. Nakao7, S. Nishida7, S. Ogawa38, T. Ohshima20, T. Okabe20, S. Okuno13, S. L. Olsen6, W. Ostrowicz25, H. Ozaki7, P. Pakhlov11, H. Palka25, C. W. Park35, H. Park15, N. Parslow36, R. Pestotnik12, L. E. Piilonen45, H. Sagawa7, Y. Sakai7, T. Schietinger16, O. Schneider16, P. Schönmeier40, J. Schümann24, S. Semenov11, K. Senyo20, R. Seuster6, H. Shibuya38, J. B. Singh30, A. Somov4, N. Soni30, R. Stamen7, S. Stanič44,*, M. Starič12, K. Sumisawa29, T. Sumiyoshi43, S. Y. Suzuki7, O. Tajima7, F. Takasaki7, N. Tamura27, M. Tanaka7, Y. Teramoto28, X. C. Tian31, S. Uehara7, T. Uglov11, K. Ueno24, S. Uno7, G. Varner6, K. E. Varvell36, S. Villa16, C. C. Wang24, C. H. Wang23, M.-Z. Wang24, B. D. Yabsley45, A. Yamaguchi40, Y. Yamashita26, M. Yamauchi7, Heyoung Yang34, J. Ying31, C. C. Zhang9, J. Zhang7, L. M. Zhang33, Z. P. Zhang33, V. Zhilich1, D. Žontar17,12, and D. Zürcher16 (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
13Kanagawa University, Yokohama
14Korea University, Seoul
15Kyungpook National University, Taegu
16Swiss Federal Institute of Technology of Lausanne, EPFL, Lausanne
17University of Ljubljana, Ljubljana
18University of Maribor, Maribor
19University of Melbourne, Victoria
20Nagoya University, Nagoya
21Nara Women’s University, Nara
22National Central University, Chung-li
23National United University, Miao Li
24Department of Physics, National Taiwan University, Taipei
25H. Niewodniczanski Institute of Nuclear Physics, Krakow
26Nihon Dental College, Niigata
27Niigata University, Niigata
28Osaka City University, Osaka
29Osaka University, Osaka
30Panjab University, Chandigarh
31Peking University, Beijing
32Princeton University, Princeton, New Jersey 08545
33University of Science and Technology of China, Hefei
34Seoul National University, Seoul
35Sungkyunkwan University, Suwon
36University of Sydney, Sydney NSW
37Tata Institute of Fundamental Research, Bombay
38Toho University, Funabashi
39Tohoku Gakuin University, Tagajo
40Tohoku University, Sendai
41Department of Physics, University of Tokyo, Tokyo
42Tokyo Institute of Technology, Tokyo
43Tokyo Metropolitan University, Tokyo
44University of Tsukuba, Tsukuba
45Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
46Yonsei University, Seoul
Received 23 December 2004; published 1 April 2005
We report the observation of an isotriplet of excited charmed baryons, decaying into Λc+π-, Λc+π0, and Λc+π+. We measure the mass differences M(Λc+π)-M(Λc+) and widths to be 515.4-3.1-6.0+3.2+2.1 MeV/c2, 61-13-13+18+22 MeV for the neutral state; 505.4-4.6-2.0+5.8+12.4 MeV/c2, 62-23-38+37+52 MeV for the charged state; and 514.5-3.1-4.9+3.4+2.8 MeV/c2, 75-13-11+18+12 MeV for the doubly charged state, where the uncertainties are statistical and systematic, respectively. These results are obtained from a 281 fb-1 data sample collected with the Belle detector near the Υ(4S) resonance, at the KEKB asymmetric energy e+e- collider.
© 2005 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.122002
DOI:
10.1103/PhysRevLett.94.122002
*On leave from Nova Gorica Polytechnic, Nova Gorica.
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