Study of b-hadron decays to Λc+ h− h′− final states

Decays of Ξb− and Ωb− baryons to Λc+ h− h′− final states, with h− h′− being π− π−, K− π− and K− K− meson pairs, are searched for using data collected with the LHCb detector. The data sample studied corresponds to an integrated luminosity of 8.7 fb^−1 of pp collisions collected at centre-of-mass energies √s = 7, 8 and 13 TeV. The products of the relative branching fractions and fragmentation fractions for each signal mode, relative to the B− → Λc+ anti-p π− mode, are measured, with Ξb− → Λc+ K− π−, Ξb− → Λc+ K− K− and Ωb− → Λc+ K− K− decays being observed at over 5σ significance. The Ξb− → Λc+ K− π− mode is also used to measure the Ξb− production asymmetry, which is found to be consistent with zero. In addition, the B− → Λc+ anti-p K− decay is observed for the first time, and its branching fraction is measured relative to that of the B− → Λc+ anti-p π− mode.