Search for $CP$ violation in ${\Lambda }_b^0\to p{K}^{-}$ and ${\Lambda }_b^0\to p{\pi }^{-}$ decays

Abstract

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

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2018-025.html

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