  Many different approaches have been made to explain the nature of dark matter
(DM), but it remains and unsolved mystery of our universe. In this work we
examine a type II two-Higgs-doublet model extended by a complex singlet
(2HDMS), where the pseudo-scalar component of the singlet acts as a natural DM
candidate. The DM candidate is stabilized by a Z'2 symmetry, which is broken
spontaneously by the singlet acquiring a vacuum expectation value (vev). This
vev in turn causes the scalar component of the singlet to mix with the scalar
components of the two doublets, which results in three scalar Higgs particles.
Additionally we aim to include an excess around 95 GeV, which was observed at
CSM and LEP and can be explained by one of the three scalar Higgs particles.
After introducing the model, we apply experimental and theoretical constraints
and find a viable benchmark point. We then look into the DM phenomenology as
well as collider phenomenology.
