Searching for GeV-scale Majorana Dark Matter: inter spem et metum
Adil Jueid, Salah Nasri, Rachik Soualah

TL;DR
This paper proposes a minimal GeV-scale Majorana dark matter model interacting with leptons via a charged scalar, highlighting its detectable cross-section below current bounds and potential collider signatures.
Contribution
It introduces a simple model linking Majorana dark matter to leptons and explores its experimental and collider phenomenology.
Findings
DM-nucleus cross-section is below current bounds but above neutrino floor.
Model can be tested at high-energy lepton colliders via mono-Higgs and charged Higgs pair production.
Anti-correlation between relic density and scattering cross-section.
Abstract
We suggest a minimal model for GeV-scale Majorana Dark Matter (DM) coupled to the standard model lepton sector via a charged scalar singlet. We show that there is an anti-correlation between the spin-independent DM-Nucleus scattering cross-section () and the DM relic density for parameters values allowed by various theoretical and experimental constraints. Moreover, we find that even when DM couplings are of order unity, is below the current experimental bound but above the neutrino floor. Furthermore, we show that the considered model can be probed at high-energy lepton colliders using e.g. the mono-Higgs production and same-sign charged Higgs pair production.
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