The production and decay of the top partner $T$ in the left-right twin higgs model at the ILC and CLIC

TL;DR

This paper investigates the production and decay of the top partner T in the left-right twin Higgs model at future electron-positron colliders, analyzing cross sections, resonance enhancements, and potential detectability.

Contribution

It provides a systematic analysis of single and pair production of the top partner T, including associated scalar productions, with detailed phenomenological predictions for future colliders.

Findings

Production cross sections can reach several or tens of femtobarns.

Resonance production cross sections can be significantly enhanced to the picobarn level.

Decay T→ϕ⁺b→tar{b}b yields distinctive signals with manageable SM backgrounds.

Abstract

The left-right twin Higgs model (LRTHM) predicts the existence of the top partner $T$. In this work, we make a systematic investigation for the single and pair production of this top partner $T$ through the processes: $e^{+}e^{-}\to t\ov{T} + T\bar{t}$ and $ T\ov{T}$, the neutral scalar (the SM-like Higgs boson $h$ or neutral pseudoscalar boson $\phi^{0}$) associate productions $e^{+}e^{-}\to t\ov{T}h +T\bar{t}h$, $T\ov{T}h$, $t\ov{T}\phi^{0}+T\bar{t}\phi^{0}$ and $ T\ov{T}\phi^{0}$. From the numerical evaluations for the production cross sections and relevant phenomenological analysis we find that (a) the production rates of these processes, in the reasonable parameter space, can reach the level of several or tens of fb; (b) for some cases, the peak value of the resonance production cross section can be enhanced significantly and reaches to the level of pb; (c) the subsequent decay of $T\to \phi^{+}b \to t\bar{b}b$ may generate typical phenomenological features rather different from the signals from other new physics models beyond the standard model(SM); and (d) since the relevant SM background is generally not large, some signals of the top partner $T$ predicted by the LRTHM may be detectable in the future ILC and CLIC experiments.