Observation of Ξ c(2930) 0 and updated measurement of B-K- Λc+Λ¯c- at Belle: Belle Collaboration

Published

Journal Article

© 2018, The Author(s). We report the first observation of the Ξ c(2930) 0 charmed-strange baryon with a significance greater than 5σ. The Ξ c(2930) 0 is found in its decay to K-Λc+ in B-→K-Λc+Λ¯c- decays. The measured mass and width are [2928.9±3.0(stat.)-12.0+0.9(syst.)] MeV/c2 and [19.5±8.4(stat.)-7.9+5.9(syst.)] MeV, respectively, and the product branching fraction is B(B-→Ξc(2930)0Λ¯c-)B(Ξc(2930)0→K-Λc+)=[1.73±0.45(stat.)±0.21(syst.)]×10-4. We also measure B(B-→K-Λc+Λ¯c-)=[4.80±0.43(stat.)±0.60(syst.)]×10-4 with improved precision, and search for the charmonium-like state Y(4660) and its spin partner, Yη, in the Λc+Λ¯c- invariant mass spectrum. No clear signals of the Y(4660) nor its spin partner are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined. These measurements are obtained from a sample of (772 ± 11) × 10 6BB¯ pairs collected at the Υ (4 S) resonance by the Belle detector at the KEKB asymmetric energy electron–positron collider.

Full Text

Duke Authors

Cited Authors

  • Li, YB; Shen, CP; Adachi, I; Ahn, JK; Aihara, H; Al Said, S; Asner, DM; Aushev, T; Ayad, R; Babu, V; Badhrees, I; Bakich, AM; Ban, Y; Bansal, V; Behera, P; Berger, M; Bhardwaj, V; Bhuyan, B; Biswal, J; Bonvicini, G; Bozek, A; Bračko, M; Browder, TE; Červenkov, D; Chekelian, V; Chen, A; Cheon, BG; Chilikin, K; Cho, K; Choi, SK; Choi, Y; Cinabro, D; Cunliffe, S; Dash, N; Di Carlo, S; Doležal, Z; Drásal, Z; Eidelman, S; Epifanov, D; Fast, JE; Ferber, T; Fulsom, BG; Garg, R; Gaur, V; Gabyshev, N; Garmash, A; Gelb, M; Giri, A; Goldenzweig, P; Guido, E; Haba, J; Hara, T; Hayasaka, K; Hayashii, H; Hedges, MT; Hou, WS; Iijima, T; Inami, K; Inguglia, G; Ishikawa, A; Itoh, R; Iwasaki, M; Iwasaki, Y; Jacobs, WW; Jia, S; Jin, Y; Joo, KK; Julius, T; Karyan, G; Kato, Y; Kawasaki, T; Kichimi, H; Kiesling, C; Kim, DY; Kim, JB; Kim, KT; Kim, SH; Kinoshita, K; Kodyš, P; Korpar, S; Kotchetkov, D; Križan, P; Kroeger, R; Krokovny, P; Kulasiri, R; Kumita, T; Kuzmin, A; Kwon, YJ; Lee, IS; Lee, SC; Li, LK; Li Gioi, L; Libby, J; Liventsev, D; Lubej, M; Luo, T; MacNaughton, J; Masuda, M; Matsuda, T; Merola, M

Published Date

  • March 1, 2018

Published In

Volume / Issue

  • 78 / 3

Electronic International Standard Serial Number (EISSN)

  • 1434-6052

International Standard Serial Number (ISSN)

  • 1434-6044

Digital Object Identifier (DOI)

  • 10.1140/epjc/s10052-018-5720-5

Citation Source

  • Scopus