Electroweak HEFT after LHC run 2

TL;DR

This paper uses Higgs effective field theory and LHC data to analyze electroweak interactions, aiming to distinguish the Higgs boson's nature and test the electroweak symmetry breaking mechanism.

Contribution

It introduces a comprehensive analysis of 25 anomalous couplings in Higgs EFT using LHC run 2 data, exploring correlations to differentiate Higgs doublet versus singlet scenarios.

Findings

Identifies correlations between observables that distinguish Higgs doublet from singlet.

Provides constraints on anomalous electroweak couplings from LHC data.

Improves understanding of electroweak symmetry breaking mechanisms.

Abstract

We analyze the electroweak interactions in the framework of the Higgs effective field theory using the available Higgs and electroweak diboson production results from LHC run 2 as well as the electroweak precision data. Assuming universality of the weak current, our study considers 25 possible anomalous couplings. To unveil the nature of the Higgs boson, i.e. isosinglet versus part of SU(2)L doublet, we explore the correlation effects between observables that are predicted to exist in the linear realization of the electroweak gauge symmetry but not in its non-linear counterpart. This improves previous studies aimed at investigating the Higgs nature and the origin of the electroweak symmetry breaking.