Dark matter pair production at the ILC in the Littlest Higgs model with T-parity

TL;DR

This paper investigates the production of heavy photon dark matter candidates in the Littlest Higgs model with T-parity at the ILC, analyzing the production rates, distributions, and detection prospects.

Contribution

It provides the first detailed analysis of heavy photon pair production rates and distributions at the ILC within the Littlest Higgs model with T-parity, highlighting potential observability.

Findings

Production rate could reach 0.1 fb at certain parameters.

Heavy photon production is detectable with high luminosity at the ILC.

Discussion on distinguishing heavy photon from other dark matter candidates.

Abstract

In the Littlest Higgs model with T-parity, the heavy photon ($A_{H}$) is supposed to be a possible dark matter (DM) candidate. A direct proof of validity of the model is to produce the heavy photon at accelerator. In this paper, we study the production rate of $ e^ + e^ - \to A_{H}A_{H}$ at the international $e^ + e^ -$ linear collider (ILC) in the Littlest Higgs model with T-parity and show the distributions of the transverse momenta of $A_{H}$. The numerical results indicate that the heavy photon production rate could reach the level of $10^{-1} fb$ at some parameter space, so it can be a good chance to observe the heavy photon via the pair production process with the high luminosity at the ILC (500 $fb^{-1}$) . We know that DM is composed of weakly-interacting massive particles (WIMPs), so the interactions with standard model (SM) particles are weakness, how to detect heavy photon at a collider and distinguish it from other DM candidates are simply discussed in the final sector of the paper.