Charm Mixing And CP Violation At LHCb

LHCb collected the world's largest sample of open charm decays during Run 1 of the Large Hadron Collider. This has permitted many precision measurements of charm mixing and CP violation parameters, the most precise of which is $ΔA_{CP}$ , a measurement of the relative strength of direct, time-integrated CP asymmetries between two singly-Cabibbo suppressed $D^0$ decays. This measurement has recently been updated using promptly produced $D^0$ mesons with the full Run 1 dataset, and has a precision below the per mille level. In addition, LHCb has recently made the first observation of $D^0$ mixing in a multibody $D^0$ decay, also measuring associated coherence parameters which can be used as input to measurements of the CKM angle γ. LHCb has also measured the mixing parameters x and y with a model-independent analysis of $D^0$ → $K^0_S π^+ π^−$ decays, and the size of direct CP violation in $D^0$ → $K^0_S K^0_S$ decays.