Measurement of the Absolute Branching Fraction of the Inclusive Decay Λ_{c}^{+}→Λ+X

Physical Review Letters
M AblikimBESIII Collaboration

Abstract

Based on an e^{+}e^{-} collision data sample corresponding to an integrated luminosity of 567  pb^{-1} taken at the center-of-mass energy of sqrt[s]=4.6  GeV with the BESIII detector, we measure the absolute branching fraction of the inclusive decay Λ_{c}^{+}→Λ+X to be B(Λ_{c}^{+}→Λ+X)=(38.2_{-2.2}^{+2.8}±0.9)% using the double-tag method, where X refers to any possible final state particles. In addition, we search for direct CP violation in the charge asymmetry of this inclusive decay for the first time, and obtain A_{CP}≡[B(Λ_{c}^{+}→Λ+X)-B(Λ[over ¯]_{c}^{-}→Λ[over ¯]+X)]/[B(Λ_{c}^{+}→Λ+X)+B(Λ[over ¯]_{c}^{-}→Λ[over ¯]+X)]=(2.1_{-6.6}^{+7.0}±1.6)%, a statistically limited result with no evidence of CP violation.

References

Feb 1, 1992·Physical Review. D·G CrawfordR S Galik
Aug 1, 1992·Physical Review. D·H Y Cheng, B Tseng
Nov 1, 1993·Physical Review. D·H Y Cheng, B Tseng
May 19, 1986·Physical Review Letters·R M BaltrusaitisG Wolf
Feb 20, 2016·Physical Review Letters·M AblikimUNKNOWN BESIII Collaboration
Sep 28, 2017·Physical Review Letters·R AaijUNKNOWN LHCb Collaboration

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