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A search for previously unobserved decays of beauty baryons to the finalstates $K^0_{\rm\scriptscriptstyle S} p \pi^{-}$ and$K^0_{\rm\scriptscriptstyle S}p K^{-}$ is reported. The analysis is based on adata sample corresponding to an integrated luminosity of $1.0\,$fb$^{-1}$ of$pp$ collisions. The $\Lambda^0_{b} \rightarrow \overline{\kern -0.2emK}^0_{\rm\scriptscriptstyle S}p \pi^{-}$ decay is observed with a significanceof $8.6\,\sigma$, with branching fraction \begin{eqnarray*}  {\cal{B}}(\Lambda^0_{b} \rightarrow \overline{\kern -0.2em K}^0 p \pi^{-}) &= & \left(1.26 \pm 0.19 \pm 0.09 \pm 0.34 \pm 0.05 \right) \times 10^{-5} \,,\end{eqnarray*} where the uncertainties are statistical, systematic, from theratio of fragmentation fractions $f_{\Lambda}/f_{d}$, and from the branchingfraction of the $B^0 \rightarrow K^0_{\rm\scriptscriptstyle S}\pi^{+}\pi^{-}$normalisation channel, respectively. A first measurement is made of the $CP$asymmetry, giving \begin{eqnarray*}  A_{C/!P} (\Lambda^0_{b} \rightarrow \overline{\kern -0.2em K}^0 p \pi^{-}) &= & 0.22 \pm 0.13\mathrm{\,(stat)} \pm 0.03\mathrm{\,(syst)} \, .\end{eqnarray*} No significant signals are seen for $\Lambda^0_{b} \rightarrowK^0_{\rm\scriptscriptstyle S}p K^{-}$ decays, $\Xi^{0}_{b}$ decays to both the$K^0_{\rm\scriptscriptstyle S}p \pi^{-}$ and $K^0_{\rm\scriptscriptstyle S}pK^{-}$ final states, and the $\Lambda^0_{b} \rightarrow D^{-}_{s} (\rightarrowK^0_{\rm\scriptscriptstyle S} K^{-}) p$ decay, and upper limits on theirbranching fractions are reported.

the journal of high energy physics/the journal of high energy physics

Searches for $\Lambda^0_{b}$ and $\Xi^{0}_{b}$ decays to $K^0_{\rm S} p  \pi^{-}$ and $K^0_{\rm S}p K^{-}$ final states with first observation of the  $\Lambda^0_{b} \rightarrow K^0_{\rm S}p \pi^{-}$ decay