Constraints on Loryons in a Two Higgs Doublet Model

TL;DR

This paper investigates the constraints on Loryons, particles with significant mass from electroweak symmetry breaking, within a two Higgs doublet model, highlighting the viability of neutral singlet Loryons up to 700 GeV and the restrictions on charged scalar representations.

Contribution

It introduces a detailed analysis of Loryon constraints in a two Higgs doublet model, focusing on various representations and experimental bounds, which is a novel exploration in this context.

Findings

Neutral singlet Loryons viable up to 700 GeV

Charged scalar representations are heavily constrained by LHC data

Constraints increase with the fraction of mass from symmetry breaking

Abstract

We consider Loryons, particles beyond the Standard Model that receive a significant fraction of their masses from electroweak symmetry breaking, in the context of a two Higgs doublet model. Using scalar Loryons in the the $[1,1]$, $[1,3]$ (as well as the equivalent $[3,1]$) and the $[2,2]$ representations of the custodial $SU(2)_L \times SU(2)_R$ global symmetry as benchmarks, we study the constraints on the Loryon parameter space, focusing on unitarity, Higgs decay observables, and the absence of Loryon vacuum expectation values. We find that while neutral singlet Loryons remain viable for masses up to 700 GeV, representations containing charged scalars are severely constrained by LHC data, particularly as the fraction of mass generated by symmetry breaking increases.