Abstract
Precision measurements of flavour observables provide powerful tests of many extensions of the Standard Model. This contribution covers a range of flavour measurements of $b\to s\ell^+\ell^-$ transitions, several of which are in tension with the Standard Model of particle physics, as well as their theoretical interpretation. The basics of the theoretical background are discussed before turning to the main question of the field: whether the anomalies can be explained by QCD effects or whether they may be indicators of effects beyond the Standard Model.
Highlights
Flavour physics has a long track record of discoveries that paved the way for advances in particle physics
In particular the discovery of B0 meson oscillations in 1987 [1] is a great example to demonstrate the potential of flavour physics to infer physics of high mass scales through precision measurements at low scales: the observed rate of oscillations was the first indication of the top quark being much heavier than the other five quark flavours
The discovery of the leptonic decay B0s → μ+μ− by the CMS and LHCb collaborations was a major breakthrough of precision flavour physics with data from Run 1 of the Large Hadron Collider
Summary
Flavour physics has a long track record of discoveries that paved the way for advances in particle physics. In particular the discovery of B0 meson oscillations in 1987 [1] is a great example to demonstrate the potential of flavour physics to infer physics of high mass scales through precision measurements at low scales: the observed rate of oscillations was the first indication of the top quark being much heavier than the other five quark flavours. There has been huge experimental progress in measurements of rare b → s processes in the past five years. This has been driven by the large bb production cross-section in pp collisions at the LHC, which enabled the LHC experiments to collect unprecedented samples of decays with dimuon finalstates
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