CP violating scalar Dark Matter
A. Cordero-Cid, J. Hern\'andez-S\'anchez, V. Keus, S. F. King, S., Moretti, D. Rojas, D. Soko{\l}owska

TL;DR
This paper explores a CP-violating extension of the inert doublet model, introducing new dark matter candidates and analyzing their relic density, while constraining the model with collider and detection experiment data.
Contribution
It presents a novel CP-violating inert doublet model with a mixed CP-charge dark matter candidate, expanding the viable parameter space compared to CP-conserving models.
Findings
New regions of dark matter relic density are identified due to CP-violation.
Parameter space is constrained using LHC and detection experiment data.
CP-violation allows for a mixed CP-charge dark matter candidate.
Abstract
We study an extension of the Standard Model (SM) in which two copies of the SM scalar doublet which do not acquire a Vacuum Expectation Value (VEV), and hence are \textit{inert}, are added to the scalar sector. We allow for CP-violation in the \textit{inert} sector, where the lightest \textit{inert} state is protected from decaying to SM particles through the conservation of a symmetry. The lightest neutral particle from the \textit{inert} sector, which has a mixed CP-charge due to CP-violation, is hence a Dark Matter (DM) candidate. We discuss the new regions of DM relic density opened up by CP-violation, and compare our results to the CP-conserving limit and the Inert Doublet Model (IDM). We constrain the parameter space of the CP-violating model using recent results from the Large Hadron Collider (LHC) and DM direct and indirect detection experiments.
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