Leptoquarks in Flavour Physics

TL;DR

This paper explores how leptoquarks could explain recent anomalies in flavor physics and the muon's magnetic moment, linking experimental hints to potential new physics beyond the Standard Model.

Contribution

It discusses the role of leptoquarks as a unified explanation for multiple flavor anomalies and their implications for future precision experiments.

Findings

Leptoquarks can account for lepton flavor universality violations.

They provide an explanation for the muon anomalous magnetic moment discrepancy.

Leptoquark effects could be observed in future Z boson decay measurements.

Abstract

While the LHC has not directly observed any new particle so far, experimental results from LHCb, BELLE and BABAR point towards the violation of lepton flavour universality in $b\to s\ell^{+}\ell^{-}$ and $b\to c\ell\nu$. In this context, also the discrepancy in the anomalous magnetic moment of the muon can be interpreted as a sign of lepton flavour universality violation. Here we discuss how these hints for new physics can also be explained by introducing leptoquarks as an extension of the Standard Model. Indeed, leptoquarks are good candidates to explain the anomaly in the anomalous magnetic moment of the muon because of an $m_{t}/m_{\mu}$ enhanced contribution giving correlated effects in $Z$ boson decays which is particularly interesting in the light of future precision experiments.