Bound States via Higgs Exchanging and Resonant Di-Higgs

TL;DR

This paper explores the formation of bound states mediated by Higgs exchange in various new physics models and discusses their potential experimental signatures at the LHC.

Contribution

It introduces the concept of Higgs-mediated bound states in new physics sectors and analyzes their phenomenology, including resonant di-Higgs signals and modifications to Higgs decay channels.

Findings

Bound states $B_h$ can form via Higgs exchange in models like SUSY and composite Higgs.

$B_h$ states produce resonant di-Higgs signatures detectable at the LHC.

Higgs radiative decays may be significantly altered if the new particles are charged or colored.

Abstract

The standard model (SM)-like Higgs boson $h$ has spin zero and light mass around weak scale, so it has the potential to mediate a new and relatively strong force for the particle $\phi$ in the new physics (NP) sector; then $\phi$ may form bound state $B_h$ via exchanging $h$. This phenomena may arise in a wide context, for instance composite Higgs, supersymmetry (SUSY) and radiative neutrino (or more widely in the models with a strong Higgs portal for triggering classical scale symmetry breaking or strong first-order phase transition). For illustration we focus on two typical examples, the stop/sbottom sector and an inert Higgs doublet. Furthermore, we point out that $B_h$ must give rise to a clear resonant di-Higgs signature, which recently has been extensively searched for at the large hadron collider (LHC). Moreover, Higgs radiative decay such as to di-photon probably will be significantly modified provided that $\phi$ is charged or/and colored.