Flavour anomalies: a review
The concept of lepton flavour universality (LFU), according to which the three lepton families are equivalent except for their masses, is a cornerstone prediction of the Standard Model (SM). LFU can be violated in models beyond the SM by new physics particles that couple preferentially to certain generations of leptons. In the last few years, hints of LFU violation have been observed in both tree-level b → cℓν and loop-level b → sℓℓ transitions. These measurements, combined with the tensions observed in angular observables and branching fractions of rare semileptonic b decays, point to a coherent pattern of anomalies that could soon turn into the first observation of physics beyond the SM. These proceedings review the anomalies seen by collider experiments, and give an outlook for the near future.
Journal of Physics Conference Series
- Pub Date:
- January 2019
- High Energy Physics - Experiment;
- High Energy Physics - Phenomenology
- 8 pages, 6 figures. Proceedings of the 13th International Conference on Beauty, Charm and Hyperon hadrons (BEACH 2018)