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\,Te -0.1em V. The products of the relative branching fractions and fragmentation fractions for each signal mode, relative to the B⁻ → Λc⁺ p̄ π⁻ mode, are measured, with Ξb⁻ →Λc⁺ K⁻ π⁻, Ξb⁻ →Λc⁺ K⁻ K⁻ and Ωb⁻ →Λc⁺ K⁻ K⁻ decays being observed at over 5\,σ 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⁺ p̄ K⁻ decay is observed for the first time, and its branching fraction is measured relative to that of the B⁻ → Λc⁺ p̄ π⁻ mode.