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semanticscholar（2018）
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摘要
Article history: Received 27 April 2018 Received in revised form 29 June 2018 Accepted 17 July 2018 Available online 25 July 2018 Editor: W.-D. Schlatter The decay Λ0 b → Λ+ c ppπ− is observed using pp collision data collected with the LHCb detector at centreof-mass energies of √ s = 7 and 8 Tev, corresponding to an integrated luminosity of 3 fb−1. The ratio of branching fractions between Λ0 b → Λ+ c ppπ− and Λ0 b → Λ+ c π− decays is measured to be B(Λ0 b → Λ+ c ppπ−) B(Λ0 b → Λ+ c π−) = 0.0540 ± 0.0023 ± 0.0032. Two resonant structures are observed in the Λ+ c π− mass spectrum of the Λ0 b → Λ+ c ppπ− decays, corresponding to the Σc(2455) and Σ∗ c (2520)0 states. The ratios of branching fractions with respect to the decay Λ0 b → Λ+ c ppπ− are B(Λ0 b → Σ0 c pp) ×B(Σ0 c → Λ+ c π−) B(Λ0 b → Λ+ c ppπ−) = 0.089 ± 0.015 ± 0.006, B(Λ0 b → Σ∗0 c pp) ×B(Σ∗0 c → Λ+ c π−) B(Λ0 b → Λ+ c ppπ−) = 0.119 ± 0.020 ± 0.014.
