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Baryogenesis and EDMs in the 2HDM with a complex singlet

Björn Garbrecht1,* and Edward Wang1,2,†

  • *Contact author: garbrecht@tum.de
  • †Contact author: edward.wang@tum.de
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Phys. Rev. D 114, 075031 – Published 27 October, 2026

DOI: https://doi.org/10.1103/cym4-8d9m

Abstract

We perform the first joint analysis of baryogenesis from initial Higgs charges (also called Higgsogenesis) and electric dipole moments (EDMs) in a model with two Higgs doublets, a complex scalar, and a Majorana fermion. In our proposed scenario, baryogenesis happens in three steps: (1) The decay of the scalar produces an asymmetry between the two Higgs doublets which is partly transferred to fermions via Standard Model processes. (2) This asymmetry is converted into a B−L charge via interactions mediated by the Majorana fermion. (3) The weak sphaleron processes partially convert the resulting B−L charge into a B asymmetry. We perform a numerical analysis of baryogenesis and the EDM contributions and find that, due to resonant enhancement, baryogenesis is possible with singlet masses as low as 105  GeV. We also find that for some parameters, the model can give large contributions to the electron and neutron EDM while also producing baryogenesis. The present scenario offers a new perspective on interpreting observational bounds in terms of cosmology: Because it relies on out-of-equilibrium decays, the questions of baryogenesis and CP violation in the Higgs sector may be linked with EDM signals without the additional assumption of a first order electroweak phase transition.

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Phys. Rev. D 114, 075031– Published 27 October, 2026
  • Received 18 February 2026
  • Accepted 25 August 2026
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