Observation of $ Λ_b^0 \to ψ(2S)pK^-$ and $ Λ_b^0 \to J/ψ π^+ π^- pK^-$ decays and a measurement of the $Λ_b^0$ baryon massстатья
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Дата последнего поиска статьи во внешних источниках: 26 сентября 2016 г.
Аннотация:The decays Λ0b→ψ(2S)pK−
and Λ0b→J/ψπ+π−pK− are observed in a data sample corresponding to an integrated luminosity of 3fb−1, collected in proton-proton collisions at 7 and 8TeV 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 Λ0b→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(Λ0b→J/ψπ+π−pK−)B(Λ0b→J/ψpK−)=(20.86±0.96±1.34)×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 Λ0b baryon is measured to be
M(Λ0b)=5619.65±0.17±0.17MeV/c2,
where the uncertainties are statistical and systematic.