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Decays of the $\Xi_b^-$ and $\Omega_b^-$ baryons to the charmless finalstates $p h^{-}h^{\prime -}$, where $h^{(\prime)}$ denotes a kaon or pion, aresearched for with the LHCb detector. The analysis is based on a sample ofproton-proton collision data collected at centre-of-mass energies $\sqrt{s} =7$ and $8 TeV$, corresponding to an integrated luminosity of $3 {\rm fb}^{-1}$.The decay $\Xi_b^- \to p K^-K^-$ is observed with a significance of $8.7$standard deviations, and evidence at the level of $3.4$ standard deviations isfound for the $\Xi_b^- \to p K^-\pi^-$ decay. Results are reported, relative tothe $B^-\to K^+K^-K^-$ normalisation channel, for the products of branchingfractions and $b$-hadron production fractions. The branching fractions of$\Xi_b^- \to p K^-\pi^-$ and $\Xi_b^- \to p \pi^-\pi^-$ relative to $\Xi_b^-\to p K^-K^-$ decays are also measured.

Observation of the decay $\Xi_b^- \to p K^-K^-$