Type II Seesaw and tau lepton at the HL-LHC, HE-LHC and FCC-hh

TL;DR

This paper explores the potential to detect doubly charged Higgs particles via tau lepton signatures at future high-energy colliders, providing mass reach estimates for different neutrino mass hierarchies.

Contribution

It presents the first detailed analysis of tau lepton signatures from Type II Seesaw models at HL-LHC, HE-LHC, and FCC-hh, estimating the accessible Higgs mass ranges.

Findings

HL-LHC can probe doubly charged Higgs up to 655-695 GeV.

HE-LHC and FCC-hh extend the reach to 975-2070 GeV.

Tau lepton signatures are crucial for distinguishing neutrino mass patterns.

Abstract

The tau lepton plays important role in distinguishing neutrino mass patterns and determining the chirality nature in heavy scalar mediated neutrino mass models, in the light of the neutrino oscillation experiments and its polarization measurement. We investigate the lepton flavor signatures with tau lepton at LHC upgrades, i.e. HL-LHC, HE-LHC and FCC-hh, through leptonic processes from doubly charged Higgs in the Type II Seesaw. We find that for the channel with one tau lepton in final states, the accessible doubly charged Higgs mass at HL-LHC can reach 655 GeV and 695 GeV for the neutrino mass patterns of normal hierarchy (NH) and inverted hierarchy (IH) respectively, with the luminosity of 3000 fb$^{-1}$. Higher masses, 975-1930 GeV for NH and 1035-2070 GeV for IH, can be achieved at HE-LHC and FCC-hh.