Mixed hidden sector/visible sector dark matter and observation of CP odd Higgs at HL-LHC and HE-LHC

Understand

It is very likely that similar to the case of visible matter, dark matter too is composed of more than one stable component.

• In this work we investigate a two-component dark matter with one component from the visible sector and the other from the hidden sector.
• Specifically we consider a $U(1)_X$ hidden sector extension of MSSM/SUGRA where we allow for kinetic and Stueckelberg mass mixing between the two abelian $U(1)'s$, i.e., $U(1)_X$ and $U(1)_Y$.
• We further assume that the hidden sector has chiral matter which leads to a Dirac fermion as a candidate for dark matter.