B-anomalies related to leptons and lepton flavour violation: new directions in model building

TL;DR

This paper reviews recent B-decay anomalies suggesting lepton flavor universality violation, analyzing constraints and electroweak corrections, and discusses model modifications needed to explain all observed anomalies.

Contribution

It provides a comprehensive analysis of B-decay anomalies, including electroweak corrections, and explores model adjustments to account for all experimental data.

Findings

Simple models are ruled out by data

Electroweak corrections significantly impact interpretations

Modified models are needed to explain all anomalies

Abstract

B-decays mediated by both charged currents and neutral currents have provided hints of violation of lepton flavour universality. By assuming an explanation of these anomalies in terms of new physics at the TeV scale affecting the third fermion generation, we review the relevant constraints. In particular we illustrate the effects of electroweak radiative corrections and their impact on a consistent interpretation of the data. The simplest scenario is ruled out and we briefly discuss the modifications required to simultaneously describe the whole set of anomalies.