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The $\varLambda^0_b \to \varLambda^+_c K^+ K^- \pi^-$ decay is observed forthe first time using a data sample of proton-proton collisions atcentre-of-mass energies of $\sqrt{s}=7$ and 8 $\rm{TeV}$ collected by the$\mbox{LHCb}$ detector, corresponding to an integrated luminosity of$3{\rm{fb}^{-1}}$. The ratio of branching fractions between the $\varLambda^0_b\to \varLambda^+_c K^+ K^- \pi^-$ and the$\varLambda^{0}_{b}\to\varLambda^{+}_{c}D^{-}_{s}$ decays is measured to be\begin{equation*} \frac{\mathcal{B} ( \varLambda^0_b \to \varLambda^+_c K^+ K^-\pi^-) } {\mathcal{B} ( \varLambda^0_b \to \varLambda^+_c D^-_s)} = (9.26 \pm0.29 \pm 0.46 \pm 0.26)\times10^{-2}, \end{equation*} where the firstuncertainty is statistical, the second systematic and the third is due to theknowledge of the $D^-_s \to K^+ K^- \pi^-$ branching fraction. No structure onthe invariant mass distribution of the $\varLambda^+_c K^+$ system is found,consistent with no open-charm pentaquark signature.

Observation of the $\varLambda^0_b \to \varLambda^+_c K^+ K^- \pi^-$ decay