Searching for GeV-scale Majorana Dark Matter: inter spem et metum

Understand

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 ($\sigma_{\mathrm{SI}}$) 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, $\sigma_{\mathrm{SI}}$ 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.