Benchmarking dark matter candidates in the 2HDMS: Prospects for future colliders

About

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).

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