Associated production of a photon with dark matter pair at the ILC within the Littlest Higgs model with T-parity

TL;DR

This paper explores the potential to detect heavy photon dark matter candidates at the ILC through associated photon production, analyzing the process and its observable signatures within the Littlest Higgs model with T-parity.

Contribution

It provides a detailed analysis of the production rate and signatures of heavy photons at the ILC, highlighting a feasible detection channel for dark matter within this theoretical framework.

Findings

Production rate can reach several fb at low mass parameters.

Characteristic signal is a high-energy photon with missing energy.

Potential for detection with high luminosity at the ILC.

Abstract

Within the context of the Littlest Higgs model with T-parity, the heavy photon ($A_{H}$) is supposed to be an ideal dark matter (DM) candidate. One direct proof of validity of the model is to produce the heavy photon at collider. In this paper, we investigate the associated production of a photon with heavy photon pair at the planned international $e^ +e^ -$ linear collider (ILC), i.e., $ e^+ e^-\to A_{H}A_{H}{\gamma}$ and show the distributions of the transverse momenta of the photon. The numerical results indicate that the heavy photon production rate could reach several $fb$ at the low mass parameter space and the characteristic signal is a single high energetic photon and missing energy, carried by the heavy photons. All in all, it can be good chance to observe the heavy photon via this process with the high yearly luminosity of the ILC.