Electroweak Baryogenesis, Electric Dipole Moments, and Higgs Diphoton Decays

TL;DR

This paper explores whether electroweak baryogenesis can occur in a two Higgs doublet model with vector-like fermions, consistent with current experimental constraints, and discusses potential future signals.

Contribution

It demonstrates the viability of electroweak baryogenesis within this model while satisfying existing EDM and Higgs decay constraints, highlighting testable future signatures.

Findings

Achieves observed baryon asymmetry in a specific parameter space

Remains consistent with current electron EDM and Higgs diphoton decay limits

Predicts potential signals for future experiments like electron EDM detection or Higgs decay measurements

Abstract

We study the viability of electroweak baryogenesis in a two Higgs doublet model scenario augmented by vector-like, electroweakly interacting fermions. Considering a limited, but illustrative region of the model parameter space, we obtain the observed cosmic baryon asymmetry while satisfying present constraints from the non-observation of the permanent electric dipole moment (EDM) of the electron and the combined ATLAS and CMS result for the Higgs boson diphoton decay rate. The observation of a non-zero electron EDM in a next generation experiment and/or the observation of an excess (over the Standard Model) of Higgs to diphoton events with the 14 TeV LHC run or a future $e^+e^-$ collider would be consistent with generation of the observed baryon asymmetry in this scenario.