Constraining new physics effective interactions via a global fit of electroweak, Drell-Yan, Higgs, top, and flavour observables

TL;DR

This paper performs a comprehensive global fit of the Standard Model and dimension-6 SMEFT Wilson coefficients using diverse experimental data to constrain potential new physics interactions.

Contribution

It introduces a consistent inclusion of scale dependence and considers different flavour symmetry limits in a global SMEFT fit using the HEPfit framework.

Findings

Constraints on Wilson coefficients from combined data

Impact of flavour symmetry assumptions on results

Updated bounds with latest experimental inputs

Abstract

We present results from a global fit of Standard Model parameters and dimension-6 SMEFT Wilson coefficients that includes electroweak, Drell-Yan, Higgs-boson, top-quark, and flavour observables. Fits obtained by floating individual coefficients are also discussed. The leading-order scale dependence of the SMEFT Wilson coefficients is consistently included in the evolution from the UV scale to the electroweak scale and the low-energy scale of flavour observables. In defining the SMEFT set of active operators we consider both the $U(3)^5$ and the $U(2)^5$ flavour symmetric limits. All fits are obtained within the $\texttt{HEPfit}$ framework and are based on the most recent experimental results and state-of-the-art theoretical predictions for all the observables considered.