Probing Doubly and Singly Charged Higgs at $pp$ Collider HE-LHC

TL;DR

This paper investigates the potential to detect doubly and singly charged Higgs bosons through multi-lepton signals at the future HE-LHC collider, considering neutrino parameter dependencies and uncertainties.

Contribution

It provides a detailed analysis of multi-lepton signals from charged Higgs decays in a type-II seesaw model at 27 TeV collider, including neutrino parameter effects.

Findings

Sensitivity estimates for charged Higgs detection at HE-LHC.

Impact of neutrino oscillation parameters on leptonic branching ratios.

Correlation between singly and doubly charged Higgs decay modes.

Abstract

We analyse the signal sensitivity of multi-lepton final states at collider that can arise from doubly and singly charged Higgs decay in a type-II seesaw framework. We assume triplet vev to be very small and degenerate masses for both the charged Higgs states. The leptonic branching ratio of doubly and singly charged Higgs states have a large dependency on the neutrino oscillation parameters, lightest neutrino mass scale, as well as neutrino mass hierarchy. We explore this as well as the relation between the leptonic branching ratios of the singly and doubly charged Higgs states in detail. We evaluate the effect of these uncertainties on the production cross-section. Finally, we present a detailed analysis of multi-lepton final states for a future hadron collider HE-LHC, that can operate with center of mass energy $\sqrt{s}=27$ TeV.