Effective field theory interpretation of ATLAS measurements involving the Higgs boson, electroweak bosons and the top quark

TL;DR

This paper performs a comprehensive combined fit of ATLAS measurements to constrain Wilson coefficients in dimension-six effective field theory, covering Higgs, electroweak, and top-quark processes, with no significant deviations from the Standard Model found.

Contribution

It provides the most extensive EFT interpretation of ATLAS data to date, constraining 48 parameters including Wilson coefficients and models like 2HDM and heavy-vector-bosons.

Findings

48 parameters constrained simultaneously

No significant deviations from the Standard Model observed

Constraints applied to two-Higgs-doublet and heavy-vector-boson models

Abstract

Wilson coefficients in dimension-six effective field theory are constrained in a combined fit to several ATLAS measurements. These inputs probe Higgs-boson processes across multiple production and decay modes, di-Higgs signatures in the $b\bar{b}\gamma\gamma$ and $b\bar{b}\tau\tau$ final states, $WW$ and $WZ$ diboson signatures, electroweak $Zjj$ final states, high-mass Drell-Yan interactions, and top-antitop events in both resolved and boosted topologies. Precision electroweak observables from LEP, SLD, and ATLAS are also included. A total of 48 parameters, including individual Wilson coefficients in the Warsaw basis and linear combinations of Wilson coefficients, are constrained simultaneously. Constraints on two-Higgs-doublet models and heavy-vector-boson models are also obtained by matching a relevant sub-set of the results with their parameters. This combined fit provides the most comprehensive effective field theory interpretation of experimental data by the ATLAS Collaboration to date. No significant deviations from the Standard Model are observed.