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We study the possibility of electroweak baryogenesis in the standard modelwith a complex scalar field, focusing mainly on a degenerate scalar scenario.In our setup, CP violation is provided by dimensional-5 Yukawa interactionsinvolving the complex scalar field. In contrast to previous studies in theliterature, we exemplify a case in which a complex phase in the singlet scalarpotential is transmitted to the fermion sector via the higher-dimensionaloperators and drives BAU. We point out that an electric dipole moment of theelectron can be suppressed due to the Higgs mass degeneracy and the presence ofa new electron Yukawa coupling. Thus, viable parameter space for electroweakbaryogenesis is still wide open for the latest experimental bound set by theJILA Collaboration.

Electron electric dipole moment and electroweak baryogenesis in a complex singlet extension of the Standard Model with degenerate scalars