Measurement of $D^0$--$\overline{D}^0$ mixing and search for $C\!P$ violation with $D^0 \to K^+\pi^-$ decays

About

Studying flavour oscillations and CP violation in charm mesons provides a complementary and unique probe of possible interactions beyond the Standard Model with beauty mesons, and allows exploring even higher energy scales. The LHCb experiment collected the largest sample of charm hadrons ever, and in 2019 reported the first observation of CP violation in $D^0 \to K^{+}K^{-}$ and $D^0 \to \pi^{+}\pi^{-}$ decays, marking a milestone in flavour physics. However, the compatibility of this 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 non-perturbative QCD effects beyond expectations. In this seminar, we present a new measurement of mixing and CP-violating parameters in $D^0 \to K^{+} \pi^{-}$ decays, using the data sample collected by the LHCb experiment during LHC Run 2. New analysis methods are used to achieve world-best results, drastically reducing the systematic uncertainties and paving the way for future measurements with larger data samples. Refreshments will be served at 10:30 .

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