Observation of Λb 0→ ψ(2S)pK−and Λb 0→ J/ψπ+π−pK−decays and a measurement of the Λb 0baryon mass

LHCb Collaboration

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17 Citations (Scopus)

Abstract

Abstract: The decays Λb 0→ ψ(2S)pKand Λb 0→ J/ψπ+πpKare 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+μand ψ(2S) → J/ψπ+π. The branching fractions relative to that of Λb 0→ J/ψpKare measured to beℬ(Λb 0→ψ(2S)pK)/ℬ(Λb 0→J/ψpK)=(20.70±0.76±0.46±0.37)×10−2, ℬ(Λb 0→ψ(2S)pK)/ℬ(Λb 0→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 Λb 0baryon is measured to be M(Λb 0)=5619.65±0.17±0.17MeV/c2, where the uncertainties are statistical and systematic.

Original language English 132 Journal of High Energy Physics 132 23 May 2016 https://doi.org/10.1007/JHEP05(2016)132 E-pub ahead of print - 23 May 2016

Keywords

• B physics
• Flavor physics