Impact of Higgs-boson measurements on SMEFT fits

TL;DR

This paper analyzes how Higgs-boson measurements constrain SMEFT operators, highlighting the impact of precision physics on setting bounds on new physics scales and discussing future improvements.

Contribution

It provides updated bounds on SMEFT operators from Higgs data, considering flavor assumptions and scale evolution, and compares results with existing literature.

Findings

Higgs observables significantly constrain SMEFT operators.

Precision measurements are starting to set lower bounds on new physics scales.

Considering scale evolution of SMEFT coefficients is relevant for accurate bounds.

Abstract

We present current bounds on SMEFT operators that are mainly constrained by Higgs-boson observables, under different assumptions for the flavour structure of the UV theory. We investigate how the accuracy reached through a dedicated Higgs-boson precision physics program is starting to have a major impact in setting a lower bound on the scale of new physics, and we discuss the relevance of considering the scale evolution of the SMEFT coefficients in this context. We compare our results with the literature, pointing out the consistency of the results in spite of the different assumptions adopted in each analysis, and we discuss future steps aimed at improving the accuracy of the fit.