Measurement of branching fractions and $CP$ asymmetries in ${\Lambda }_b^0({\Xi }_b^0)\to p{K}_{\mathrm{S}}^0{h}^{-}$ decays

Abstract

A study of ${\Lambda }_b^0$ and ${\Xi }_b^0$ baryon decays to the final states $p{K}_{\mathrm{S}}^0{\pi }^{-}$ and $p{K}_{\mathrm{S}}^0{K}^{-}$ is performed using $pp$ collision data collected by the LHCb experiment, corresponding to an integrated luminosity of $9{\mathrm{fb}}^{-1}$. The decays ${\Lambda }_b^0\to p{K}_{\mathrm{S}}^0{K}^{-}$ and ${\Xi }_b^0\to p{K}_{\mathrm{S}}^0{K}^{-}$ are observed for the first time, with significances reaching eight standard deviations. The branching fractions and integrated $CP$ asymmetries are measured for the ${\Lambda }_b^0\to p{K}_{\mathrm{S}}^0{\pi }^{-}$, ${\Lambda }_b^0\to p{K}_{\mathrm{S}}^0{K}^{-}$, and ${\Xi }_b^0\to p{K}_{\mathrm{S}}^0{K}^{-}$ decays. For the decay ${\Lambda }_b^0\to p{K}_{\mathrm{S}}^0{\pi }^{-}$, the $CP$ asymmetries are measured in different regions of the Dalitz plot. No evidence of $CP$ violation is observed.

arXiv commentAll figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://lbfence.cern.ch/alcm/public/analysis/full-details/4179/ (LHCb public pages)

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