Abstract
We study popular scalar extensions of the Standard Model, namely the singlet extension, the 2-Higgs doublet model (2HDM) and its extension by a singlet scalar. We focus on the contributions of the added scalars to the anomalous magnetic moment of the muon, (g − 2)μ in the presence of CP-violation, and the electric dipole moment of the electron (eEDM) in these models. In the absence of CP-violation, CP-even and CP-odd scalars contribute with an opposite sign to the anomalous magnetic moment of the muon and as a result these models generally require very light scalars to explain the observed discrepancy in (g − 2)μ. We study the effect of CP-violation on the anomalous magnetic moment of the muon and its compatibility with the eEDM constraints. We show that given the current status of the global set of constraints applied on all values of cot β, in the CP-violating scalar extensions, there exist no viable parameter space in agreement with both aμ and eEDM bounds.
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Keus, V., Koivunen, N. & Tuominen, K. Singlet scalar and 2HDM extensions of the Standard Model: CP-violation and constraints from (g − 2)μ and eEDM. J. High Energ. Phys. 2018, 59 (2018). https://doi.org/10.1007/JHEP09(2018)059
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DOI: https://doi.org/10.1007/JHEP09(2018)059