Fermion Singlet Dark Matter in a Pseudoscalar Dark Matter Portal

Understand

We explore a simple extension to the Standard Model containing two gauge singlets: a Dirac fermion and a real pseudoscalar.

• In some regions of the parameter space both singlets are stable without the necessity of additional symmetries, then becoming a possible two-component dark matter model.
• We study the relic abundance production via freeze-out, with the latter determined by annihilations, conversions and semi-annihilations.
• Experimental constraints from invisible Higgs decay, dark matter relic abundance and direct/indirect detection are studied.