# Observation of the decay Λ b 0  → ψ(2S)pπ −

27 August 2018

Abstract: The Cabibbo-suppressed decay Λ b 0  → ψ(2S)pπ − is observed for the first time using a data sample collected by the LHCb experiment in proton-proton collisions corresponding to 1.0, 2.0 and 1.9 fb −1 of integrated luminosity at centre-of-mass energies of 7, 8 and 13 TeV, respectively. The ψ(2S) mesons are reconstructed in the μ + μ − final state. The branching fraction with respect to that of the Λ b 0  → ψ(2S)pK − decay mode is measured to be

Published in: JHEP 1808 (2018) 131