Lepton collider signatures of dark CP violation

Abstract

We study an extension of the Standard Model (SM) in which two copies of the SM Higgs doublet are added to the scalar sector. These extra doublets do not develop a vacuum expectation value, hence, they are \textit{inert}. This essentially leads to a 3-Higgs Doublet Model (3HDM) with 2 inert and 1 active scalar doublets, which we denote as I(2+1)HDM. 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 $Z_2$ symmetry, so that it is a Dark Matter (DM) candidate. For this scenario, we identify a smoking gun signature of dark CP-violation in the form of production thresholds of pairs of \textit{inert} neutral Higgs bosons at an $e^{+}{e}^{-}$ collider.

arXiv comment19 pages, 4 figures, published version

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Cited by in corpus (10)

• Search for a charged Higgs boson decaying into a heavy neutral Higgs boson and a W boson in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• The $Z_3$ symmetric I(2+1)HDM
• CP asymmetries of $\overline{B}\to X_s/X_d\gamma$ in models with three Higgs doublets
• Dark CP-violation through the $Z$-portal
• P-even, CP-violating Signals in Scalar-Mediated Processes
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• Probing Dark Sector CP Violation with Electric Dipole Moments and Colliders