Speaker
Description
CP violation plays a crucial role in accounting for the matter–antimatter imbalance observed in the Universe. This talk presents measurements of branching fractions and CP asymmetries in the decays $\Lambda_b^0(\Xi_b^0)\to pK_{\mathrm S}^0h^-$, where $h^-$ denotes either a pion or a kaon, using proton–proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of $9\,\mathrm{fb}^{-1}$. The decays $\Lambda_b^0 \to pK_{\mathrm S}^0K^-$ and $\Xi_b^0 \to pK_{\mathrm S}^0K^-$ are observed for the first time, with significances reaching eight standard deviations. The integrated CP asymmetries are measured for the $\Lambda_b^0 \to pK_{\mathrm S}^0\pi^-$, $\Lambda_b^0 \to pK_{\mathrm S}^0K^-$, and $\Xi_b^0 \to pK_{\mathrm S}^0K^-$ decays. For the decay $\Lambda_b^0 \to pK_{\mathrm S}^0\pi^-$, the CP asymmetries are measured in different regions of the Dalitz plot. No evidence of CP violation is observed in any of the decay modes.
