Fermion Portal Dark Matter

Understand

We study a class of simplified dark matter models in which one dark matter particle couples with a mediator and a Standard Model fermion.

• In such models, collider and direct detection searches probe complimentary regions of parameter space.
• For Majorana dark matter, direct detection covers the region near mediator-dark matter degeneracy, while colliders probe regions with a large dark matter and mediator mass splitting.
• For Dirac and complex dark matter, direct detection is effective for the entire region above the mass threshold, but colliders provide a strong bound for dark matter lighter than a few GeV.