Current and future constraints on Higgs couplings in the nonlinear Effective Theory

TL;DR

This paper uses Bayesian analysis to constrain Higgs couplings within the nonlinear Effective Theory, utilizing current LHC data and projecting future collider sensitivities, with implications for composite Higgs models.

Contribution

It provides the first comprehensive Bayesian bounds on Higgs effective coefficients in the nonlinear framework using LHC data and explores future collider sensitivities.

Findings

Current LHC data constrains Higgs couplings within the nonlinear Effective Theory.

Future colliders could significantly improve sensitivity to Wilson coefficients.

Results are interpreted in the context of minimal composite Higgs models.

Abstract

We perform a Bayesian statistical analysis of the constraints on the nonlinear Effective Theory given by the Higgs electroweak chiral Lagrangian. We obtain bounds on the effective coefficients entering in Higgs observables at the leading order, using all available Higgs-boson signal strengths from the LHC runs 1 and 2. Using a prior dependence study of the solutions, we discuss the results within the context of natural-sized Wilson coefficients. We further study the expected sensitivities to the different Wilson coefficients at various possible future colliders. Finally, we interpret our results in terms of some minimal composite Higgs models.