Measurement of the Absolute Branching Fraction of the Inclusive Decay Λ+c→Λ+X

BESIII Collaboration, M. Ablikim, M.N. Achasov, S. Ahmed, M. Albrecht, M. Alekseev, A. Amoroso, Zahra Haddadi, Nasser Kalantar-Nayestanaki, Myroslav Kavatsyuk, Johannes Messchendorp, Marcel Tiemens

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    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 √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+2.8−2.2±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 ACP≡[B(Λ+c→Λ+X)−B(¯Λ−c→¯Λ+X)]/[B(Λ+c→Λ+X)+B(¯Λ−c→¯Λ+X)]=(2.1+7.0−6.6±1.6)%, a statistically limited result with no evidence of CP violation.
    Original languageEnglish
    JournalPhysical Review Letters
    Volume121
    Issue number6
    DOIs
    Publication statusPublished - 7-Aug-2018

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