Phenomenology of a Higgs triplet model at future $e^{+}e^{-}$ colliders

TL;DR

This paper explores how future electron-positron colliders can test a Higgs triplet model by analyzing the production and decay of additional Higgs states, highlighting distinctive features for model identification.

Contribution

It provides a detailed phenomenological analysis of Higgs triplet model signatures at future $e^{+}e^{-}$ colliders, focusing on observable states and their distinguishing features.

Findings

Second heaviest CP-even Higgs can be triplet-like, singlet-like, or mixed.

Future colliders can potentially observe additional Higgs states predicted by the model.

Distinctive collider signatures can differentiate this model from others.

Abstract

In this work, we investigate the prospects of future $e^{+}e^{-}$ colliders in testing a Higgs triplet model with a scalar triplet and a scalar singlet under $SU(2)$. The parameters of the model are fixed so that the lightest $CP-$even state corresponds to the Higgs particle observed at the LHC at around $125$ GeV. This study investigates if the second heaviest $CP-$even, the heaviest $CP-$odd and the singly charged states can be observed at existing and future colliders by computing their accessible production and decay channels. In general, the LHC is not well equipped to produce a Higgs boson which is not mainly doublet-like, so we turn our focus to lepton colliders. We find distinctive features of this model in cases when the second heaviest $CP-$even Higgs is triplet-like, singlet-like or a mixture. These features could distinguish the model from other scenarios at future $e^{+}e^{-}$ colliders.