Enhanced di-Higgs Production in the Complex Higgs Singlet Model

TL;DR

This paper explores an extension of the Standard Model with a complex scalar singlet, showing that it can significantly enhance di-Higgs production rates through resonant processes, consistent with current experimental constraints.

Contribution

It introduces a complex scalar singlet extension allowing large resonant di-Higgs production, expanding the potential for discovering new scalar states at high-energy colliders.

Findings

Large di-Higgs production rates are possible within experimental constraints.

Resonant production of scalar states can dominate over SM processes.

Enhanced signals are predicted at collider energies of 13, 27, and 100 TeV.

Abstract

We consider the Standard Model extended by the addition of a complex scalar singlet, with no assumptions about additional symmetries of the potential. This model provides for resonant di-Higgs production of Higgs particles with different masses. We demonstrate that regions of parameter space allowed by precision electroweak measurements, experimental limits on single Higgs production, and perturbative unitarity allow for large di-Higgs production rates relative to the SM rates. In this scenario, the dominant production mechanism of the new scalar states is di-Higgs production. Results are presented for $\sqrt{S}=13$, $27$ and $100~TeV$.