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

Ustyuzhanin A., Likhomanenko T., Derkach D., Rogozhnikov A., Borisyak M., LHCb c.

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 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.