A Review of $C\!P$ Violation Measurements in Charm at LHCb

TL;DR

This review summarizes recent LHCb measurements of $C ext{P}$ violation in charm decays, including direct and time-dependent asymmetries, and reports the first observation of mass difference in neutral charm mesons.

Contribution

It compiles the latest experimental results from LHCb on $C ext{P}$ violation in charm, highlighting new measurements and the first observation of mass difference between neutral charm meson eigenstates.

Findings

Observation of $C ext{P}$ violation in charm decays.

Most precise measurement of time-dependent $C ext{P}$ asymmetry.

First observation of mass difference between neutral charm mesons.

Abstract

The LHCb experiment has been able to collect the largest sample ever produced of charm-hadron decays, performing a number of measurements of observables related to $C\!P$ violation in the charm sector. In this document, the most recent results from LHCb on the search of direct $C\!P$ violation in $D^0 \to K_s^0 K_s^0$, $D_{(s)}^+ \to h^+ \pi^0$ and $D_{(s)}^+ \to h^+ \eta$ decays are summarised, in addition to the most precise measurement of time-dependent $C\!P$ asymmetry in $D^0 \to h^+ h^-$ decays and the first observation of mass difference between neutral charm-meson eigenstates.