Electroweak right-handed neutrinos and new signals at the LHC

TL;DR

This paper investigates a model with electroweak-scale right-handed neutrinos, featuring an extended Higgs sector, and analyzes its Higgs phenomenology and potential signals at the LHC.

Contribution

It introduces a model with right-handed neutrinos at the electroweak scale and an extended Higgs sector, detailing its phenomenology and LHC detection prospects.

Findings

Scalar spectrum includes two CP-even and one CP-odd Higgs states.

Higgs branching ratios and cross-sections are analyzed for LHC detection.

Model parameters are constrained by perturbativity criteria.

Abstract

We explore in detail the Higgs phenomenology that results in a model where right-handed neutrinos have a mass scale of the order of the electroweak scale. In this model all scales arise from spontaneous symmetry breaking, and this is achieved with a Higgs sector that includes an extra Higgs singlet in addition to the standard model Higgs doublet. The scalar spectrum includes two neutral CP-even states ($h$ and $H$ with $m_{h} < m_{H}$)and a neutral CP-odd state ($\sigma$) that can be identified as a pseudo-Majoron. The parameter of the Higgs potential are constrained using a perturbativity criteria. Higgs BR and cross-sections are discussed, with special emphasis on the detection at the LHC.