Detection possibility of a pseudo-FIMP in the presence of a thermal WIMP

Abstract

A dark matter (DM) having feeble interaction with the visible sector can thermalize via substantial interaction with a weakly interacting massive particle (WIMP). Such DM candidates can be categorized as pseudofeebly interacting massive particles (pFIMPs). pFIMPs have both direct and indirect search prospects via a WIMP loop. This work focuses on such possibilities. We provide all such one loop graphs stemming from pFIMP-WIMP interactions involving scalar, fermion, and vector boson particles, assuming both of them are stabilized via Z2⊗Z2′ symmetries. We elaborate upon a model where a fermionic WIMP has a significant Yukawa interaction with a scalar pFIMP with negligible Higgs portal coupling. We study, in detail, the loop induced direct and indirect search prospects of the pFIMP in the relic density allowed region of the model along with collider expectations at the LHC. Published by the American Physical Society 2024