Lepton Flavour Universality tests in $B$ decays as a probe for New Physics

TL;DR

This paper reviews recent tests of lepton flavour universality in B decays at LHCb, highlighting tensions with the Standard Model that could indicate new physics beyond current theories.

Contribution

It summarizes the latest experimental results on lepton flavour universality tests in B decays, emphasizing potential signs of new physics.

Findings

Tensions observed in rare $b o s\,\ell\ell$ decays.

Anomalies in semileptonic $b\to c\tau\bar{\nu}_\tau$ transitions.

Results suggest possible violation of lepton flavour universality.

Abstract

In the Standard Model (SM), the coupling of the electroweak gauge bosons to the leptons is lepton flavour universal. Tests of this property constitute sensitive probes for new physics models that violate lepton flavour universality. Recent tests of lepton universality in rare $b\to s\ell\ell$ decays and semileptonic $b\to c\tau\bar{\nu}_\tau$ transitions have shown some tensions with the precise SM predictions. These proceedings summarise the latest results on lepton flavour universality from the LHCb experiment.