Collider search of light dark matter model with dark sector decay

TL;DR

This paper investigates a light dark matter model where dark matter is produced via decay of heavier dark sector particles, and assesses the potential of future lepton colliders to detect such signatures more effectively than hadron colliders.

Contribution

It introduces a concrete light dark matter model with dark sector decay and evaluates collider signatures, highlighting the advantages of future lepton colliders over hadron colliders.

Findings

Future lepton colliders can better probe light dark matter models.

A 250 GeV Higgs factory has superior detection potential compared to a 350 GeV one.

Lepton colliders offer promising signatures for dark sector decay detection.

Abstract

We explore the possibility that the dark matter relic density is not produced by thermal mechanism directly, but by the decay of other heavier dark sector particles which on the other hand can be produced by the thermal freeze-out mechanism. Using a concrete model with a light dark matter from dark sector decay, we study the collider signature of the dark sector particles in association with Higgs production processes. We find that the future lepton colliders can be a better place to probe the signature of this kind of light dark matter model than the hadron collider such as LHC. Meanwhile, it is found that a Higgs factory with center of mass energy 250 GeV has a better potential to resolve the signature of this kind of light dark matter model than the Higgs factory with center of mass energy 350 GeV.