Experimental constraints on the spin and parity of the Λc(2880)+

Mizuk, R. ; Abe, K. ; Adachi, I. ; Aihara, H. ; Anipko, D. ; Aulchenko, V. ; Aushev, T. ; Bakich, A.M. ; Balagura, V. ; Barberio, E. ; Bay, A. ; Bedny, I. ; Belous, K. ; Bitenc, U. ; Bizjak, I. ; Blyth, S. ; Bondar, A. ; Bozek, A. ; Bračko, M. ; Brodzicka, J. ; Browder, T.E. ; Chang, M.-C. ; Chen, A. ; Chen, K.-F. ; Chen, W.T. ; Cheon, B.G. ; Chistov, R. ; Choi, Y. ; Choi, Y.K. ; Cole, S. ; Dalseno, J. ; Danilov, M. ; Drutskoy, A. ; Eidelman, S. ; Epifanov, D. ; Fratina, S. ; Gabyshev, N. ; Garmash, A. ; Gershon, T. ; Gokhroo, G. ; Golob, B. ; Ha, H. ; Haba, J. ; Hayasaka, K. ; Hayashii, H. ; Hazumi, M. ; Heffernan, D. ; Hokuue, T. ; Hoshi, Y. ; Hou, S. ; Hou, W.-S. ; Iijima, T. ; Ikado, K. ; Imoto, A. ; Inami, K. ; Ishikawa, A. ; Itoh, R. ; Iwasaki, M. ; Iwasaki, Y. ; Kaji, H. ; Kang, J.H. ; Kapusta, P. ; Katayama, N. ; Khan, H.R. ; Kichimi, H. ; Kim, Y.J. ; Kinoshita, K. ; Korpar, S. ; Križan, P. ; Krokovny, P. ; Kulasiri, R. ; Kumar, R. ; Kuo, C.C. ; Kuzmin, A. ; Kwon, Y.-J. ; Leder, G. ; Lee, J. ; Lee, M.J. ; Lee, S.E. ; Lesiak, T. ; Lin, S.-W. ; Liventsev, D. ; Majumder, G. ; Mandl, F. ; Matsumoto, T. ; Matyja, A. ; McOnie, S. ; Miyake, H. ; Miyata, H. ; Miyazaki, Y. ; Nakao, M. ; Natkaniec, Z. ; Nishida, S. ; Ogawa, S. ; Ohshima, T. ; Okuno, S. ; Onuki, Y. ; Ozaki, H. ; Pakhlov, P. ; Pakhlova, G. ; Park, H. ; Park, K.S. ; Peak, L.S. ; Pestotnik, R. ; Piilonen, L.E. ; Sakai, Y. ; Satoyama, N. ; Schneider, O. ; Schümann, J. ; Seidl, R. ; Senyo, K. ; Sevior, M.E. ; Shapkin, M. ; Shibuya, H. ; Singh, J.B. ; Somov, A. ; Soni, N. ; Stanič, S. ; Starič, M. ; Stoeck, H. ; Suzuki, S.Y. ; Takasaki, F. ; Tamai, K. ; Tanaka, M. ; Taylor, G.N. ; Teramoto, Y. ; Tian, X.C. ; Tikhomirov, I. ; Tsuboyama, T. ; Tsukamoto, T. ; Uehara, S. ; Uglov, T. ; Ueno, K. ; Uno, S. ; Urquijo, P. ; Usov, Y. ; Varner, G. ; Villa, S. ; Wang, C.H. ; Watanabe, Y. ; Won, E. ; Xie, Q.L. ; Yabsley, B.D. ; Yamaguchi, A. ; Yamashita, Y. ; Yamauchi, M. ; Yuan, C.Z. ; Zhang, L.M. ; Zhang, Z.P. ; Zhilich, V. ; Zupanc, A.

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 52 over 32 or 12. 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 52+ over 52-. 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 553fb-1 data sample collected at or near the Υ(4S) resonance at the KEKB collider. © 2007 The American Physical Society.


Published in:
Physical Review Letters, 98, 26, 262001
Year:
2007
Other identifiers:
Scopus: 2-s2.0-34547292556
View record in Web of Science
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