Pseudoscalar Portal Dark Matter and New Signatures of Vector-like Fermions

Understand

Fermionic dark matter interacting with the Standard Model sector through a pseudoscalar portal could evade the direct detection constraints while preserving a WIMP miracle.

• We study the LHC constraints on the pseudoscalar production in simplified models with the pseudoscalar either dominantly coupled to b quarks or tau leptons and explore their implications for the GeV excesses in gamma ray observations.
• We also investigate models with new vector-like fermions that could realize the simplified models of pseudoscalar portal dark matter.
• These models yield new decay channels and signatures of vector-like fermions, for instance, bbb, btautau, and tautautau resonances.