Exploring Higgs Triplet Models via Vector Boson Scattering at the LHC

TL;DR

This study investigates the potential to detect Higgs triplet bosons predicted by various models at the LHC through vector boson scattering, emphasizing the importance of luminosity and model constraints.

Contribution

It provides a detailed analysis of Higgs triplet detection prospects at the LHC across different models and decay channels, highlighting the Georgi-Machacek model as most promising.

Findings

Detection is feasible with high luminosity, especially in the Georgi-Machacek model.

Higgs triplet bosons of 1.0 and 1.5 TeV can be observed with 41 and 119 fb^{-1} in W^\u00b1 W^b1 channels.

Observation in W^b1 Z channel requires higher luminosity, around 171 to 474 fb^{-1}.

Abstract

We present the results of a study of Higgs triplet boson production arising in the Littlest Higgs, Left-Right Symmetric, and Georgi-Machacek models in the W^\pm W^\pm, W^\pm Z, W^+ W^-, and Z Z channels at the LHC. We focus on the "gold-plated" purely leptonic decay modes and consider the irreducible electroweak, QCD, and t-quark backgrounds, applying a combination of forward-jet-tagging, central-jet-vetoing, and stringent leptonic cuts to suppress the backgrounds. We find that, given the constraints on the triplet vacuum expectation value (vev), considerable luminosity is required to observe Higgs triplet bosons in vector boson scattering. Observing a Higgs triplet at the LHC is most promising in the Georgi-Machacek model due to a weaker constraint on the triplet vev. In this model, we find that a Higgs triplet boson with a mass of 1.0 (1.5) TeV can be observed at the LHC with an integrated luminosity as low as 41 (119) fb^{-1} in the W^\pm W^\pm channel and as low as 171 (474) fb^{-1} in the W^\pm Z channel. Observation of Higgs triplet bosons in these channels would help identify the underlying theory.