Signatures of Extra Gauge Bosons in the Littlest Higgs Model with T-parity at Future Colliders

TL;DR

This paper investigates how future colliders can detect and measure the properties of new gauge bosons predicted by the Littlest Higgs Model with T-parity, focusing on collider signatures, mass measurement, and model discrimination.

Contribution

It provides a detailed analysis of collider signatures of T-odd gauge bosons in the LHT, including mass and spin measurements at future colliders, and distinguishes LHT from other models.

Findings

LHC can discover W_H bosons via leptonic decay channels.

Mass of W_H can be accurately measured at the Linear Collider.

Spin correlation analysis helps differentiate LHT from other new physics models.

Abstract

We study the collider signatures of a T-odd gauge boson $W_{H}$ pair production in the Littlest Higgs Model with T-parity (LHT) at Large Hadron Collider (LHC) and Linear Collider (LC). At the LHC, we search for the $W_{H}$ boson using its leptonic decay, i.e. $pp\to W_{H}^{+}W_{H}^{-}\to A_{H}A_{H}\ell^{+}\nu_{\ell}\ell^{\prime-}\bar{\nu}_{\ell^{\prime}}$, which gives rise to a collider signature of $\ell^{+}\ell^{\prime-}+\met$. We demonstrate that the LHC not only has a great potential of discovering the $W_{H}$ boson in this channel, but also can probe enormous parameter space of the LHT. Due to four missing particles in the final state, one cannot reconstruct the mass of $W_{H}$ at the LHC. But such a mass measurement can be easily achieved at the LC in the process of $e^{+}e^{-}\to W_{H}^{+}W_{H}^{-}\to A_{H}A_{H}W^{+}W^{-}\to A_{H}A_{H}jjjj$. We present an algorithm of measuring the mass and spin of the $W_{H}$ boson at the LC. Furthermore, we illustrate that the spin correlation between the $W$ boson and its mother particle ($W_{H}$) can be used to distinguish the LHT from other new physics models.