The study of CP violation in charm mesons provides a complementary probe for possible interactions beyond the Standard Model with respect to beauty mesons, and allows the exploration of even higher energy scales. The LHCb experiment collected the largest sample of charm hadrons ever, order of billions of decays, and reported the first observation of CP violation in
$D^0 \to K^+ K^-$ and $D^0 \to pi^+ \pi^-$ decays in 2019, marking a milestone in flavour physics. However, two years later the compatibility of the observation with the Standard Model is still debated, and providing complementary experimental results is a crucial step towards clarifying whether we are facing new interactions or an enhancement of nonperturbative QCD effects beyond expectations. In this seminar, new measurements of CP violation in $D$-meson decays at LHCb, using the full Run 1 and Run 2 data samples, will be presented. New analysis methodologies allow to provide world-best measurements also for final states involving neutral hadrons, whose study at hadron colliders is particularly challenging.
Michelangelo Mangano, Monica Pepe-Altarelli and Pedro Silva.