Constraining four-heavy-quark operators with top-quark, Higgs, and electroweak precision data

TL;DR

This paper constrains four-heavy-quark operators in SMEFT using LHC top-Higgs data and electroweak measurements, highlighting the importance of the $ ext{gamma}_5$ scheme choice in calculations.

Contribution

It provides the first comprehensive analysis combining LHC and electroweak data to constrain four-heavy-quark operators, emphasizing scheme dependence in SMEFT fits.

Findings

Constraints on four-heavy-quark operators established

Impact of $ ext{gamma}_5$ scheme on SMEFT fits demonstrated

Combined data improves sensitivity to new physics

Abstract

We establish constraints on the dimension-six four-heavy-quark operators in the Standard Model Effective Field Theory (SMEFT) by synthesising LHC measurements of top-quark and single-Higgs production with electroweak precision observables. We scrutinise the choice of the $\gamma_5$ scheme in single-Higgs calculations, demonstrating its non-negligible impact on SMEFT fits.