Heavy quarks and tau leptons: New physics opportunities

TL;DR

This paper explores how heavy quarks and tau leptons can be used to detect new physics, focusing on scalar sector effects, lepton flavor violation, and lepton universality violations in tau-related processes.

Contribution

It highlights the potential of heavy quarks and tau leptons in revealing new physics effects related to the scalar sector, especially in lepton flavor violation and tauonic B decays.

Findings

Enhanced scalar sector effects for heavy fermions due to mass hierarchy

Potential signals of lepton flavor violation in tau decays

Possible violations of lepton universality in tauonic B decays

Abstract

In this talk I discuss the role of heavy quarks in new physics searches with tau leptons. I focus on new physics effects associated to the scalar sector which are naturally enhanced for the heaviest fermions due to the large hierarchy of the fermion masses. I will discuss two topics within this context: lepton flavour violation in the $\tau - \ell$ ($\ell=e,\mu$) sector and violations of lepton universality in tauonic $B$ decays.