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The first observation of the decays $\Lambda_b^0 \to \chi_{c1} p K^-$ and$\Lambda_b^0 \to \chi_{c2} p K^-$ is reported using a data sample correspondingto an integrated luminosity of $3.0$ fb$^{-1}$, collected by the LHCbexperiment in $pp$ collisions at centre-of-mass energies of 7 and 8 TeV. Thefollowing ratios of branching fractions are measured  \begin{eqnarray*}  \frac{{\cal B}(\Lambda_b^0 \to \chi_{c1} p K^-)}{{\cal B}(\Lambda_b^0 \toJ/\psi p K^-)} = 0.242 \pm 0.014 \pm 0.013 \pm 0.009,  \frac{{\cal B}(\Lambda_b^0 \to \chi_{c2} p K^-)}{{\cal B}(\Lambda_b^0 \toJ/\psi p K^-)} = 0.248 \pm 0.020 \pm 0.014 \pm 0.009,  \frac{{\cal B}(\Lambda_b^0 \to \chi_{c2} p K^-)}{{\cal B}(\Lambda_b^0 \to\chi_{c1} p K^-)} = 1.02 \pm 0.10 \pm 0.02 \pm 0.05,  \end{eqnarray*} where the first uncertainty is statistical, the secondsystematic and the third due to the uncertainty on the branching fractions ofthe $\chi_{c1}\to J/\psi\gamma$ and $\chi_{c2} \to J/\psi\gamma$ decays. Usingboth decay modes, the mass of the $\Lambda_b^0$ baryon is also measured to be$m_{\Lambda_b^0} = 5619.44 \pm 0.28 \pm 0.26$ MeV/$c^2$, where the first andsecond uncertainties are statistical and systematic, respectively.

Observation of the decays $\Lambda_b^0 \to \chi_{c1} p K^-$ and $\Lambda_b^0 \to \chi_{c2} p K^-$