The absence of results coming from direct searches of New Physics (NP) performed in high-energy colliders, indicates that if such NP exist, corresponding effects would arise beyond the electroweak scale. Thus, high precision measurements of rare processes in the heavy flavour sector are among the most promising paths to search for beyond Standard Model (SM) physics.
Indeed, new particles could enter virtually the loop diagrams mediating rare decays and thus modify their properties, such as CP asymmetry parameters, branching fractions or angular distributions.
This seminar will first review some of the recent results in heavy flavour physics exhibiting tensions with the SM predictions.
Then, the status and prospects of measurements probing the photon polarisation in $b\to s \gamma$ transitions will be discussed.