Probing the Higgs Sector of the Minimal Left-Right Symmetric Model at Future Hadron Colliders

TL;DR

This paper explores the extended Higgs sector in a minimal Left-Right symmetric model with TeV-scale symmetry breaking, analyzing its potential discovery at future high-energy colliders like the HL-LHC and FCC-hh.

Contribution

It provides a detailed analysis of the Higgs boson masses, couplings, production, and decay modes in this model, and estimates collider sensitivities for discovering new Higgs states.

Findings

Heavy Higgs bosons can be probed up to 15 TeV at a 100 TeV collider.

Identification of optimal discovery channels for non-Standard Model Higgs bosons.

Distinguishing features of the LR Higgs sector from other extended Higgs models.

Abstract

If neutrino masses arise from a TeV-scale minimal Left-Right seesaw model, the ensuing extended Higgs sector with neutral, singly and doubly-charged scalars has a plethora of implications for new Higgs boson searches beyond the Standard Model at future hadron colliders, such as the $\sqrt s=14$ TeV High-Luminosity Large Hadron Collider (HL-LHC) and the proposed $\sqrt s=100$ TeV collider (FCC-hh or SPPC). In this article, we provide a glimpse of this new physics in the Higgs sector. Our discussion focuses on the minimal non-supersymmetric version of the Left-Right model with high-scale parity breaking but TeV-scale $SU(2)_R$-breaking, a property desirable to suppress the type-II seesaw contribution to neutrino masses. We analyze the masses and couplings of the physical Higgs bosons in this model, and discuss their dominant production and decay modes at hadron colliders. We identify the best discovery channels for each of the non-SM Higgs bosons and estimate the expected SM backgrounds in these channels to derive the sensitivity reaches for the new Higgs sector at future hadron colliders under discussion. Following a rather conservative approach, we estimate that the heavy Higgs sector can be effectively probed up to 15 TeV at the $\sqrt s=100$ TeV machine. We also discuss how the LR Higgs sector can be distinguished from other extended Higgs sectors.