Observation of Λ0b→ψ(2S)pK−Λb0→ψ(2S)pK− and Λ0b→J/ψπ+π−pK−Λb0→J/ψπ+π−pK− decays and a measurement of the Λ0bΛb0 baryon mass

LHCb Collaboration

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    Abstract

    The decays Λb0 → ψ(2S)pK− and Λb0 → J/ψπ+π−pK− are observed in a data sample corresponding to an integrated luminosity of 3 fb−1, collected in proton-proton collisions at 7 and 8 TeV centre-of-mass energies by the LHCb detector. The ψ(2S) mesons are reconstructed through the decay modes ψ(2S) → μ+μ− and ψ(2S) → J/ψπ+π−.

    The branching fractions relative to that of Λb0 → J/ψpK− are measured to be
    B(Λ0b→ψ(2S)pK−)B(Λ0b→J/ψpK−)=(20.70±0.76±0.46±0.37)×10−2,
    B(Λb0→ψ(2S)pK−)B(Λb0→J/ψpK−)=(20.70±0.76±0.46±0.37)×10−2,
    where the first uncertainties are statistical, the second are systematic and the third is related to the knowledge of J/ψ and ψ(2S) branching fractions. The mass of the Λb0 baryon is measured to be
    M(Λ0b)=5619.65±0.17±0.17 MeV/c2,
    M(Λb0)=5619.65±0.17±0.17 MeV/c2,
    where the uncertainties are statistical and systematic.
    Original languageEnglish
    Article number132
    JournalThe Journal of High Energy Physics
    Volume2016
    Issue number5
    DOIs
    Publication statusPublished - 23 May 2016

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