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Résumé |
Recent data on $b \to c \ell \nu$ and $b \to s \ell \ell$ transitions exhibit
an
interesting pattern of
deviations from Standard Model expectations, hinting at the violation of lepton
flavour universality. I will recall the current situation for the various
observables of interest. I will discuss the theoretical approaches used to
determine the Standard Model predictions for these observables and some of
their shortcomings, before explaining how the observed deviations can be
analysed in a model-independent framework. I will then briefly discuss some of
the simplified New Physics models used to explain the deviations observed.
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