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P. Adlarson; A. Amoroso; Y. Bai; R. Baldini Ferroli; I. Balossino; K. Begzsuren; F. Bianchi; W. L. Chang; Y. B. Chen; R. B. de Boer; A. Denig; Y. Fang; G. Felici; W. Gradl; R. P. Guo; Y. P. Guo; F. H. Heinsius; L. Q. Huang; N. Huesken; H. B. Jiang; X. S. Jiang; O. B. Kolcu; A. Kupsc; M. G. Kurth; P. Larin; T. Lenz; H. J. Li; Ke Li; S. Y. Li; W. D. Li; Z. B. Li; Z. Y. Li; H. Liang; H. Liang; J. Libby; C. X. Lin; H. B. Liu; Huanhuan Liu; Q. Liu; Z. A. Liu; Y. F. Long; C. L. Luo; X. R. Lyu; F. C. Ma; Q. M. Ma; R. Q. Ma; X. Y. Ma; Z. X. Meng; T. J. Min; N. Yu. Muchnoi; H. Muramatsu; Y. Nefedov; I. B. Nikolaev; Z. Ning; S. Nisar; S. L. Olsen; R. Poling; T. Y. Qi; S. Qian; X. P. Qin; J. F. Qiu; M. Rolo; M. Savrié; M. Shao; X. Y. Shen; R. S. Shi; J. Tang; B. L. Wang; Meng Wang; W. H. Wang; Ziyi Wang; G. Wilkinson; Z. Wu; L. Xia; S. Y. Xiao; T. Y. Xing; G. F. Xu; X. P. Xu; Xu Yan; H. J. Yang; H. X. Yang; L. Yang; J. S. Yu; Z. Y. Yuan; Guangyi Zhang; H. H. Zhang; H. Y. Zhang; J. W. Zhang; Jiawei Zhang; L. Zhang; Yi Zhang; J. Zhao; Ling Zhao; M. G. Zhao; Y. Zheng; B. Zhong; L. P. Zhou; X. K. Zhou; S. H. Zhu; B. S. Zou
The European physical journal. C, Particles and fields, 10/2020, Letnik: 80, Številka: 10Journal Article
Abstract We report the first measurement of the absolute branching fraction of the inclusive decay $$\Lambda _c^+ \rightarrow K_S^0X$$ Λ c + → K S 0 X . The analysis is performed using an $$e^+e^-$$ e + e - collision data sample corresponding to an integrated luminosity of 567 $$\hbox {pb}^{-1}$$ pb - 1 taken at $$\sqrt{s}$$ s = 4.6 GeV with the BESIII detector. Using eleven Cabibbo-favored $${\bar{\Lambda }}_c^-$$ Λ ¯ c - decay modes and the double-tag technique, this absolute branching fraction is measured to be $${\mathcal {B}}(\Lambda _c^+ \rightarrow K_S^0X)=(9.9\pm 0.6\pm 0.4)\%$$ B ( Λ c + → K S 0 X ) = ( 9.9 ± 0.6 ± 0.4 ) % , where the first uncertainty is statistical and the second systematic. The relative deviation between the branching fractions for the inclusive decay and the observed exclusive decays is $$(18.7\pm 8.3)\%$$ ( 18.7 ± 8.3 ) % , which indicates that there may be some unobserved decay modes with a neutron or excited baryons in the final state.
