Search for $C\text{\hspace{0.17em}⁣}P$ violation in ${\mathrm{\Lambda }}_b^0\to p{K}^{-}$ and ${\mathrm{\Lambda }}_b^0\to p{\pi }^{-}$ decays

A search for $C\text{\hspace{0.17em}⁣}P$ violation in ${\mathrm{\Lambda }}_b^0\to p{K}^{-}$ and $\Lambda^0_b \to p \pi^-$decaysispresentedusingasampleof$pp$ collisions collected with the LHCb detector and corresponding to an integrated luminosity of 3.0 fb${}^{-1}$. The $C\text{\hspace{0.17em}⁣}P$-violating asymmetries are measured to be $A_{\mathrm{C}\mathrm{P}}^{p{K}^{-}}=-0.020\pm 0.013\pm 0.019$ and $A_{\mathrm{C}\mathrm{P}}^{p{\pi }^{-}}=-0.035\pm 0.017\pm 0.020$, and their difference $A_{\mathrm{C}\mathrm{P}}^{p{K}^{-}}-A_{\mathrm{C}\mathrm{P}}^{p{\pi }^{-}}=0.014\pm 0.022\pm 0.010$, where the first uncertainties are statistical and the second systematic. These are the most precise measurements of such asymmetries to date.