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

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 $f{b}^{-1}$) . 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.

Comments: 11 pages, 5 figures