Leptoquarks in Oblique Corrections and Higgs Signal Strength: Status and Prospects

TL;DR

This paper explores how scalar leptoquarks affect Higgs decay processes and electroweak precision observables, providing a framework to distinguish different leptoquark types at future colliders.

Contribution

It systematically analyzes all five scalar leptoquark representations, including their mixing, and studies their effects on Higgs signals and oblique parameters, revealing correlations among observables.

Findings

Current bounds are weak but future colliders can distinguish LQ types.

Correlations among Higgs decay channels and oblique parameters depend on LQ parameters.

The study provides a basis for future experimental searches for leptoquarks.

Abstract

Leptoquarks (LQs) are predicted within Grand Unified Theories and are well motivated by the current flavor anomalies. In this article we investigate the impact of scalar LQs on Higgs decays and oblique corrections as complementary observables in the search for them. Taking into account all five LQ representations under the Standard Model gauge group and including the most general mixing among them, we calculate the effects in $h\to\gamma\gamma$, $h\to gg$, $h \to Z \gamma$ and the Peskin-Takeuchi parameters $S$, $T$ and $U$. We find that these observables depend on the same Lagrangian parameters, leading to interesting correlations among them. While the current experimental bounds only yield weak constraints on the model, these correlations can be used to distinguish different LQ representations at future colliders (ILC, CLIC, FCC-ee and FCC-hh), whose discovery potential we are going to discuss.