Probing the Higgs boson through Yukawa force

TL;DR

This paper discusses how recent LHC measurements of Higgs decays and couplings have constrained new physics models beyond the Standard Model, especially in the context of composite Higgs and multi-Higgs scenarios.

Contribution

It analyzes the impact of Higgs coupling measurements on beyond Standard Model theories, projecting future constraints at HL-LHC and Higgs factories.

Findings

Higgs coupling measurements significantly restrict new physics parameter space.

Future collider data will further tighten constraints on composite and multi-Higgs models.

The study provides projections for various BSM scenarios based on upcoming experimental capabilities.

Abstract

The ATLAS and CMS collaborations of the LHC have observed that the Higgs boson decays into the bottom quark-antiquark pair, and have also established that the Higgs coupling with the top quark-antiquark pair is instrumental in one of the modes for Higgs production. This underlines the discovery of the Yukawa force at the LHC. We demonstrate the impact of this discovery on the Higgs properties that are related to the dynamics of electroweak symmetry breaking. We show that these measurements have considerably squeezed the allowed window for new physics contributing to the Higgs couplings with the weak gauge bosons and the third generation quarks. The expected constraints at the HL-LHC and future Higgs factories are also shown. We project these constraints on the parameter space of a few motivated scenarios beyond the Standard Model. We pick them under two broad categories, namely, the composite Higgs and its RS dual, as well as various types of multi-Higgs models. The latter category includes models with singlet scalars, Type I, II and BGL-type two-Higgs doublet models, and models with scalar triplets a la Georgi and Machacek.