Phys. Rev. Lett.
98,
262001
(2007)
[6 pages]
Experimental Constraints on the Spin and Parity of the Λc(2880)+
R. Mizuk et al. Belle Collaboration
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R. Mizuk12, K. Abe7, I. Adachi7, H. Aihara45, D. Anipko1, V. Aulchenko1, T. Aushev17,12, A. M. Bakich40, V. Balagura12, E. Barberio20, A. Bay17, I. Bedny1, K. Belous11, U. Bitenc13, I. Bizjak13, S. Blyth23, A. Bondar1, A. Bozek26, M. Bračko7,19,13, J. Brodzicka26, T. E. Browder6, M.-C. Chang3, A. Chen23, K.-F. Chen25, W. T. Chen23, B. G. Cheon5, R. Chistov12, Y. Choi39, Y. K. Choi39, S. Cole40, J. Dalseno20, M. Danilov12, A. Drutskoy2, S. Eidelman1, D. Epifanov1, S. Fratina13, N. Gabyshev1, A. Garmash34, T. Gershon7, G. Gokhroo41, B. Golob18,13, H. Ha15, J. Haba7, K. Hayasaka21, H. Hayashii22, M. Hazumi7, D. Heffernan31, T. Hokuue21, Y. Hoshi43, S. Hou23, W.-S. Hou25, T. Iijima21, K. Ikado21, A. Imoto22, K. Inami21, A. Ishikawa45, R. Itoh7, M. Iwasaki45, Y. Iwasaki7, H. Kaji21, J. H. Kang49, P. Kapusta26, N. Katayama7, H. R. Khan46, H. Kichimi7, Y. J. Kim4, K. Kinoshita2, S. Korpar19,13, P. Križan18,13, P. Krokovny7, R. Kulasiri2, R. Kumar32, C. C. Kuo23, A. Kuzmin1, Y.-J. Kwon49, G. Leder10, J. Lee37, M. J. Lee37, S. E. Lee37, T. Lesiak26, S.-W. Lin25, D. Liventsev12, G. Majumder41, F. Mandl10, T. Matsumoto47, A. Matyja26, S. McOnie40, H. Miyake31, H. Miyata28, Y. Miyazaki21, M. Nakao7, Z. Natkaniec26, S. Nishida7, S. Ogawa42, T. Ohshima21, S. Okuno14, Y. Onuki35, H. Ozaki7, P. Pakhlov12, G. Pakhlova12, H. Park16, K. S. Park39, L. S. Peak40, R. Pestotnik13, L. E. Piilonen48, Y. Sakai7, N. Satoyama38, O. Schneider17, J. Schümann24, R. Seidl8,35, K. Senyo21, M. E. Sevior20, M. Shapkin11, H. Shibuya42, J. B. Singh32, A. Somov2, N. Soni32, S. Stanič29, M. Starič13, H. Stoeck40, S. Y. Suzuki7, F. Takasaki7, K. Tamai7, M. Tanaka7, G. N. Taylor20, Y. Teramoto30, X. C. Tian33, I. Tikhomirov12, T. Tsuboyama7, T. Tsukamoto7, S. Uehara7, T. Uglov12, K. Ueno25, S. Uno7, P. Urquijo20, Y. Usov1, G. Varner6, S. Villa17, C. H. Wang24, Y. Watanabe46, E. Won15, Q. L. Xie9, B. D. Yabsley40, A. Yamaguchi44, Y. Yamashita27, M. Yamauchi7, C. Z. Yuan9, L. M. Zhang36, Z. P. Zhang36, V. Zhilich1, and A. Zupanc13 (Belle Collaboration)
1Budker Institute of Nuclear Physics, Novosibirsk
2University of Cincinnati, Cincinnati, Ohio 45221
3Department of Physics, Fu Jen Catholic University, Taipei
4The Graduate University for Advanced Studies, Hayama, Japan
5Hanyang University, Seoul
6University of Hawaii, Honolulu, Hawaii 96822
7High Energy Accelerator Research Organization (KEK), Tsukuba
8University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
9Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
10Institute of High Energy Physics, Vienna
11Institute of High Energy Physics, Protvino
12Institute for Theoretical and Experimental Physics, Moscow
13J. Stefan Institute, Ljubljana
14Kanagawa University, Yokohama
15Korea University, Seoul
16Kyungpook National University, Taegu
17Swiss Federal Institute of Technology of Lausanne, EPFL, Lausanne
18University of Ljubljana, Ljubljana
19University of Maribor, Maribor
20University of Melbourne, Victoria
21Nagoya University, Nagoya
22Nara Women’s University, Nara
23National Central University, Chung-li
24National United University, Miao Li
25Department of Physics, National Taiwan University, Taipei
26H. Niewodniczanski Institute of Nuclear Physics, Krakow
27Nippon Dental University, Niigata
28Niigata University, Niigata
29University of Nova Gorica, Nova Gorica
30Osaka City University, Osaka
31Osaka University, Osaka
32Panjab University, Chandigarh
33Peking University, Beijing
34Princeton University, Princeton, New Jersey 08544
35RIKEN BNL Research Center, Upton, New York 11973
36University of Science and Technology of China, Hefei
37Seoul National University, Seoul
38Shinshu University, Nagano
39Sungkyunkwan University, Suwon
40University of Sydney, Sydney NSW
41Tata Institute of Fundamental Research, Bombay
42Toho University, Funabashi
43Tohoku Gakuin University, Tagajo
44Tohoku University, Sendai
45Department of Physics, University of Tokyo, Tokyo
46Tokyo Institute of Technology, Tokyo
47Tokyo Metropolitan University, Tokyo
48Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
49Yonsei University, Seoul
Received 12 January 2007; published 28 June 2007
We report the results of several studies of the Λc+π+π-X final state in continuum e+e- annihilation data collected by the Belle detector. An analysis of angular distributions in Λc(2880)+→Σc(2455)0,++π+,- decays strongly favors a Λc(2880)+ spin assignment of 5/2 over 3/2 or 1/2. We find evidence for Λc(2880)+→Σc(2520)0,++π+,- decay and measure the ratio of Λc(2880)+ partial widths Γ(Σc(2520)π)/Γ(Σc(2455)π)=0.225±0.062±0.025. This value favors the Λc(2880)+ spin-parity assignment of 5/2+ over 5/2-. We also report the first observation of Λc(2940)+→Σc(2455)0,++π+,- decay and measure Λc(2880)+ and Λc(2940)+ mass and width parameters. These studies are based on a 553 fb-1 data sample collected at or near the Υ(4S) resonance at the KEKB collider.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.262001
DOI:
10.1103/PhysRevLett.98.262001
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