Higgs couplings beyond the Standard Model

TL;DR

This paper develops a tailored parameterisation for Higgs boson processes to test new physics models beyond the Standard Model, comparing it with existing approaches and emphasizing the importance of detailed experimental data for future analyses.

Contribution

It introduces a new formalism for Higgs couplings that enhances the testing of beyond Standard Model physics, considering various existing parameterisations and their applications.

Findings

Comparison of formalism with existing parameterisations

Discussion on the impact of experimental data quality

Framework for future Higgs coupling analyses

Abstract

We consider the Higgs boson decay processes and its production, and provide a parameterisation tailored for testing models of new physics beyond the Standard Model. We also compare our formalism to other existing parameterisations based on scaling factors in front of the couplings and to effective Lagrangian approaches. Different formalisms allow to best address different aspects of the Higgs boson physics. The choice of a particular parameterisation depends on a non-obvious balance of quantity and quality of the available experimental data, envisaged purpose for the parameterisation and degree of model independence, importance of the radiative corrections, scale at which new particles appear explicitly in the physical spectrum. At present only simple parameterisations with a limited number of fit parameters can be performed, but this situation will improve with the forthcoming experimental LHC data. Detailed fits can only be performed by the experimental collaborations at present, as the full information on the different decay modes is not completely available in the public domain. It is therefore important that different approaches are considered and that the most detailed information is made available to allow testing the different aspects of the Higgs boson physics and the possible hints beyond the Standard Model.