Speaker
Description
The Two Higgs Doublet model extended with a complex scalar singlet
(2HDMS) is a well-motivated Beyond-the-Standard Model candidate with the
potential to explain dark matter (DM). The extended scalar sector results
in three scalar, two charged, one pseudo-scalar and one pseudo-scalar DM
candidate. The DM candidate is provided by the imaginary component
of the complex scalar singlet. It is stabilized by a Z2 symmetry, which
is broken spontaneously by the real part of the complex scalar singlet
acquiring a vacuum expectation value.
In this presentation, we study the DM phenomenology of this model
and identify different benchmarks. The main focus lies on analyzing the
prospects at future colliders, the High-Luminosity Large Hadron Collider
(HL-LHC), the International Linear Collider (ILC), a Future Circular
Collider in electron-positron mode (FCC-ee, CEPC), the Compact Linear
Collider (CLIC), and a muon collider, for different benchmarks. These
benchmarks cover different regions of the allowed parameter space, while
taking into account theoretical as well as experimental constraints.
We discuss both possibilities, i.e. with and without accommodating
an experimental excess at 95 GeV observed both at the Large Electron
Positron Collider (LEP) and at the Large Hadron Collider (LHC).