Charm mixing and CP violation at LHCb

LHCb has collected the world's largest sample of charmed hadrons. This sample is used to search for direct CP violation in the multibody prompt charm decays $D^0 \to \pi^- \pi^+ \pi^0$ The search employs an unbinned model independent method known as the energy test. Using the data collected by LHCb at centre-of-mass energy of 8 TeV, the world's best sensitivity to CP violation in this decay is achieved. The data are found to be consistent with the hypothesis of CP symmetry with a p-value of (2.6 ± 0.5)%. In addition, new measurements of indirect CP violation in muon-tagged $D^0$ decays to two-body CP even final states are presented. The time dependent CP asymmetries in the decay rates of the singly Cabibbo-suppressed decays $D^0 \to K^- K^+$ and $D^0 \to \pi^- \pi^+$ decays using the full LHCb run 1 data set are determined to be $A_r(K^- K^+)$ = $(-0.134 ± 0.077^{+0.026}_{-0.034})%$ and $A_r(\pi^- \pi^+)$ = $(-0.092 ± 0.145^{+0.026}_{-0.034})%$. These results are compatible with the hypothesis of no indirect CPV and with previous LHCb measurements.