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.
Highlights
The discovery of the Higgs boson at the Large Hadron Collider (LHC) has experimentally proven that fermions’ and gauge bosons’ masses in the Standard Model (SM) are generated via the Brout-Englert-Higgs (BEH) mechanism
We focus on the region of small triplet vacuum expectation value (VEV), where the doubly and singly charged Higgs naturally decay to same-sign dileptons and lepton plus neutrino, respectively
The model signatures in this low-VEV regime strongly depend on the neutrino oscillation parameters, the neutrino mass hierarchy, and the lightest neutrino mass scale
Summary
The discovery of the Higgs boson at the Large Hadron Collider (LHC) has experimentally proven that fermions’ and gauge bosons’ masses in the Standard Model (SM) are generated via the Brout-Englert-Higgs (BEH) mechanism. Searched for the same-sign dilepton final states with different flavors, and have excluded the mass of the doubly charged. An alternative search, where the HÆÆ is produced in association with two jets—i.e., vector boson fusion—gives relaxed constraints [36,37] In another scenario, the doubly charged Higgs decays to same-sign WÆ-. Collaboration have searched for the same final state and have excluded the doubly charged Higgs mass between 200 and 220 GeVat 95% C.L. We discuss how the inclusion of uncertainties in the neutrino oscillation parameters affect the theory cross section, which may in turn change the mass limits of doubly charged Higgs in ienndeirvgiyduapl ffisffic1⁄4han1n3eðlso.r. As 14Þ it is TeV well known that for c.m. LHC, the production of multi-TeV HÆÆ will be difficult due to the suppressed cross section.
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