https://scholars.lib.ntu.edu.tw/handle/123456789/574845
標題: | Evidence of a structure in K¯0Λc+ consistent with a charged Ξ c(2930) + , and updated measurement of B¯0→K¯0Λc+Λ¯c- at Belle: Belle Collaboration | 作者: | Li Y.B. et al. Kang, K. H. Jacobs, W. W. Chilikin, K. Chekelian, V. Golob, B. Merola, M. Kim, D. Y. Bra?ko, M. Jin, Y. Inami, K. Fulsom, B. G. Liventsev, D. Jia, S. Fast, J. E. Hirose, S. Di Carlo, S. Lee, S. C. Kri?an, P. Bahinipati, S. Chang, P. Biswal, J. Cinabro, D. Gaur, V. Kaliyar, A. B. Bhardwaj, V. Kroeger, R. Badhrees, I. Luo, T. Ishikawa, A. Cunliffe, S. Kawasaki, T. Bobrov, A. Korpar, S. Goldenzweig, P. Kato, Y. Mori, T. Behera, P. Haba, J. Hayasaka, K. Itoh, R. Joo, K. K. PAO-TI CHANG MIN-ZU WANG WEI-SHU HOU |
公開日期: | 2018 | 卷: | 78 | 期: | 11 | 來源出版物: | European Physical Journal C | 摘要: | We report evidence for the charged charmed-strange baryon Ξ c(2930) + with a signal significance of 3.9σ with systematic errors included. The charged Ξ c(2930) + is found in its decay to KS0Λc+ in the substructure of B¯0→KS0Λc+Λ¯c- decays. The measured mass and width are [2942.3 ± 4.4 (stat.) ± 1.5 (syst.)] MeV/c2 and [14.8 ± 8.8 (stat.) ± 2.5 (syst.)] MeV, respectively, and the product branching fraction is B(B¯0→Ξc(2930)+Λ¯c-)B(Ξc(2930)+→K¯0Λc+)=[2.37±0.51(stat.)±0.31(syst.)]×10-4. We also measure B(B¯0→K¯0Λc+Λ¯c-)=[3.99±0.76(stat.)±0.51(syst.)]×10-4 with greater precision than previous experiments, and present the results of a 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) or Yη 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. ? 2018, The Author(s). |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85056570344&doi=10.1140%2fepjc%2fs10052-018-6425-5&partnerID=40&md5=35194ae55dc4034c71196a22a47d7011 https://scholars.lib.ntu.edu.tw/handle/123456789/574845 |
ISSN: | 14346044 | DOI: | 10.1140/epjc/s10052-018-6425-5 |
顯示於: | 物理學系 |
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