Signals of New Gauge Bosons in Gauged Two Higgs Doublet Model

TL;DR

This paper investigates the signals of new gauge bosons in a gauged two Higgs doublet model, analyzing their production, detection prospects at colliders, and distinguishing features from similar models.

Contribution

It introduces a gauged two Higgs doublet model with new gauge bosons and studies their collider signatures and distinguishability from other models.

Findings

$Z'$ can be constrained by current LHC data.

High-luminosity collider could discover $Z'$ via Drell-Yan signals.

Distinct kinematic features differentiate the model from the littlest Higgs with T-parity.

Abstract

Recently a gauged two Higgs doublet model, in which the two Higgs doublets are embedded into the fundamental representation of an extra local $SU(2)_H$ group, is constructed. Both the new gauge bosons $Z^\prime$ and $W^{\prime (p,m)}$ are electrically neutral. While $Z^\prime$ can be singly produced at colliders, $W^{\prime (p,m)}$, which is heavier, must be pair produced. We explore the constraints of $Z^\prime$ using the current Drell-Yan type data from the Large Hadron Collider. Anticipating optimistically that $Z^\prime$ can be discovered via the clean Drell-Yan type signals at high luminosity upgrade of the collider, we explore the detectability of extra heavy fermions in the model via the two leptons/jets plus missing transverse energy signals from the exotic decay modes of $Z^\prime$. For the $W^{\prime (p,m)}$ pair production in a future 100 TeV proton-proton collider, we demonstrate certain kinematical distributions for the two/four leptons plus missing energy signals have distinguishable features from the Standard Model background. In addition, comparisons of these kinematical distributions between the gauged two Higgs doublet model and the littlest Higgs model with T-parity, the latter of which can give rise to the same signals with competitive if not larger cross sections, are also presented.