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

TL;DR

A combined analysis of LHC Higgs data (signal strengths) together with LEP-2 WW production measurements using 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 Λ.

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 $Λ$. The analysis is performed consistently at the order $Λ^{-2}$ 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.

Figures (1)

• Figure 1: Allowed 68% and 95% CL region in the $\delta g_{1,z}$-$\delta \kappa_\gamma$ plane after considering LEP-2 $WW$ production data (TGC), Higgs data, and the combination of both datasets.