Global constraints on anomalous triple gauge couplings in effective field theory approach

TL;DR

This paper combines LHC Higgs and LEP-2 WW data within an Effective Field Theory framework to set model-independent constraints on anomalous triple gauge couplings, advancing precision tests of the Standard Model.

Contribution

It performs a comprehensive, order $ ext{Λ}^{-2}$ EFT analysis combining multiple data sets to constrain anomalous gauge couplings with all relevant operators included.

Findings

Stringent model-independent bounds on anomalous triple gauge couplings.

Combined data sets help resolve flat directions in EFT parameter space.

Provides combined fit results in various EFT bases.

Abstract

We present a combined analysis of LHC Higgs data (signal strengths) together with LEP-2 WW production measurements. To characterize possible deviations from the Standard Model (SM) predictions, we employ the framework of an Effective Field Theory (EFT) where the SM is extended by higher-dimensional operators suppressed by the mass scale of new physics $\Lambda$. The analysis is performed consistently at the order $\Lambda^{-2}$ in the EFT expansion keeping all the relevant operators. While the two data sets suffer from flat directions, together they impose stringent model-independent constraints on the anomalous triple gauge couplings. As a side product, we provide the results of the combined fit in different EFT bases.