CP violation measurements in three-body charmless B decays

This study reports $\mathit{\text{CP}}$ asymmetry measurements in charmless three-body decays of $\mathit{\text{B}}$ mesons, both using the Run II data from proton-proton collisions at a center-of-mass energy of 13 $TeV$, collected by the LHCb detector from 2015 to 2018, with an integrated luminosity of 5.9 $f{b}^{-1}$. Significant $\mathit{\text{CP}}$ asymmetries are observed in $B^{\pm }\to {\pi }^{\pm }{\pi }^{+}{\pi }^{-}$ and $B^{\pm }\to K^{\pm }{K}^{+}{K}^{-}$ decays, while the previously observed asymmetry in $B^{\pm }\to {\pi }^{\pm }{K}^{+}{K}^{-}$ decays is confirmed, and the $\mathit{\text{CP}}$ asymmetry of $B^{\pm }\to K^{\pm }{\pi }^{+}{\pi }^{-}$ decays is found to be compatible with zero. Additionally, a new method is used to measure the $\mathit{\text{CP}}$ asymmetry in charmless $B\to PV$ decays, showing significant asymmetry in $B^{\pm }\to K^{\pm }{\pi }^{+}{\pi }^{-}$ decays dominated by $\rho (770)$, representing the first observation of $\mathit{\text{CP}}$ violation in this process. Other decay channels show $\mathit{\text{CP}}$ asymmetries compatible with zero.