Interference effects of two scalar boson propagators on the LHC search for the singlet fermion DM

Understand

A gauge invariant UV-completion for singlet fermion DM interacting with the standard model (SM) particles involves a new singlet scalar.

• Therefore the model contains two scalar mediators, mixtures of the SM Higgs boson and a singlet scalar boson.
• Collider phenomenology of the interference effect between these two scalar propagators is studied in this work.
• This interference effect can be either constructive or destructive in the DM production cross section depending on both singlet scalar and DM masses, and it will soften the final state jets in the full mass region.