Flavour Anomalies

Abstract

The experimental data on $b\to c\tau {\bar{\nu }}_{\tau }$ and $b\to s{\ell }^{+}{\ell }^{-}$ transitions exhibit sizeable discrepancies with the Standard Model expectations. We present an overview of the present status and discuss possible interpretations within a model-independent effective Lagrangian approach. We also briefly elaborate on some other claimed flavour anomalies such as the recently observed CP asymmetry in $D^0$ decays or the $K^0\to \pi \pi$ ratio ${\epsilon }_K^{\prime }/{\epsilon }_K^{}$. The Standard Model prediction for the direct $CP$-violating ratio ${\epsilon }_K^{\prime }/{\epsilon }_K^{}$ agrees with its measured value, once all theoretical ingredients are correctly taken into account.

Comments: Invited talk at LHCP2019 (Puebla, México, 20-25 May 2019). 12 pages, 3 figures