Study of b-hadron decays to c^+h^-h^ - final states

Decays of ₁^- and ₁^- baryons to ₂^+ h^- h^ - final states, with h^- h^ - being ^-^-, K^-^- 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^- ₂^+ p ^- mode, are measured, with ₁^- ₂^+ K^- ^-, ₁^- ₂^+ K^- K^- and ₁^- ₂^+ K^- K^- decays being observed at over 5\, significance. The ₁^- ₂^+ K^- ^- mode is also used to measure the ₁^- production asymmetry, which is found to be consistent with zero. In addition, the B^- ₂^+ p K^- decay is observed for the first time, and its branching fraction is measured relative to that of the B^- ₂^+ p ^- mode.