Type-II seesaw model with two-Higgs doublets

TL;DR

This paper investigates the production and detection prospects of doubly charged Higgs particles in a two-Higgs-doublet extension of the type-II seesaw model, highlighting new decay patterns and potential observability at the LHC.

Contribution

It introduces the effects of mixing between singly charged Higgs bosons on the production and decay of doubly charged Higgs in an extended seesaw model.

Findings

Doubly charged Higgs below 330 GeV detectable at 13 TeV LHC with 40 fb$^{-1}$.

Mixing effects lead to new production and decay channels.

Potential to observe Higgs up to 450 GeV with 300 fb$^{-1}$.

Abstract

A study of searching for doubly charged Higgs $(\delta^{\pm\pm})$ is performed in two-Higgs-doublet extension of the type-II seesaw model. We find that a significant mixing effect between singly charged Higgs of Higgs doublet and of triplet is arisen from the scalar potential. The mixing leads to new production processes and decay patterns of doubly charged Higgs. With luminosity of 40 fb$^{-1}$ and collision energy of 13 TeV at the LHC, we show that $\delta^{\pm\pm}$ with mass below $330$ GeV could be observed at the $5\sigma$ level. Moreover, for the luminosity of 300 fb$^{-1}$, the observed mass of $\delta^{\pm\pm}$ could reach up to 450 GeV.