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The Cabibbo-suppressed decay $\Lambda_b^0\rightarrow\chi_{c1}p\pi^-$ isobserved for the first time using data from proton-proton collisionscorresponding to an integrated luminosity of 6fb$^{-1}$, collected with theLHCb detector at a centre-of-mass energy of 13TeV. Evidence for the$\Lambda_b^0\rightarrow\chi_{c2}p\pi^-$ decay is also found. Using the$\Lambda_b^0\rightarrow\chi_{c1}pK^-$ decay as normalisation channel, theratios of branching fractions are measured to be $$\begin{array}{rcl} \frac{\mathcal{B} (\Lambda_b^0\rightarrow\chi_{c1}p\pi^-)}{\mathcal{B}(\Lambda_b^0\rightarrow\chi_{c1}pK^-)} & = & (6.59 \pm 1.01 \pm 0.22 ) \times10^{-2} \,,  \frac{\mathcal{B} (\Lambda_b^0\rightarrow\chi_{c2}p\pi^-)}{\mathcal{B}(\Lambda_b^0\rightarrow\chi_{c1}p\pi^-)} & = & 0.95 \pm 0.30 \pm 0.04 \pm 0.04\,,  \frac{\mathcal{B} (\Lambda_b^0\rightarrow\chi_{c2}pK^-)}{\mathcal{B}(\Lambda_b^0\rightarrow\chi_{c1}pK^-)} & = & 1.06 \pm 0.05 \pm 0.04 \pm 0.04\,,\end{array}$$ where the first uncertainty is statistical, the second issystematic and the third is due to the uncertainties in the branching fractionsof $\chi_{c1,2}\rightarrow J/\psi\gamma$ decays.

Observation of the decay $\Lambda_b^0\rightarrow\chi_{c1}p\pi^-$