Abstract In this paper we study a leptophilic dark matter scenario involving feeble dark matter coupling to the Standard Model (SM) and compressed dark matter-mediator mass spectrum.We consider a simplified model where the SM is extended with one Majorana fermion, the dark matter, and one charged scalar, the mediator, coupling Food Storage Container Sets to the SM leptons through a Yukawa interaction.We first discuss the dependence of the dark matter relic abundance on the Yukawa coupling going continuously from freeze-in D-pad/board to freeze-out with an intermediate stage of conversion driven freeze-out.
Focusing on the latter, we then exploit the macroscopic decay length of the charged scalar to study the resulting long-lived-particle signatures at collider and to explore the experimental reach on the viable portion of the parameter space.