Electroweak Baryogenesis in R-symmetric Supersymmetry

TL;DR

This paper shows that electroweak baryogenesis can be achieved in an R-symmetric supersymmetric model, which naturally avoids light stops and electric dipole moment constraints, while explaining the baryon asymmetry.

Contribution

It introduces a minimal R-symmetric supersymmetric model that enables electroweak baryogenesis with a strong phase transition and sufficient Higgs mass without light stops or EDM constraints.

Findings

Electroweak baryogenesis is possible in R-symmetric SUSY models.

The model achieves a 125 GeV Higgs with heavy stops.

Large CP phases can generate baryon asymmetry without EDM constraints.

Abstract

We demonstrate that electroweak baryogenesis can occur in a supersymmetric model with an exact R-symmetry. The minimal R-symmetric supersymmetric model contains chiral superfields in the adjoint representation, giving Dirac gaugino masses, and an additional set of "R-partner" Higgs superfields, giving R-symmetric \mu-terms. New superpotential couplings between the adjoints and the Higgs fields can simultaneously increase the strength of the electroweak phase transition and provide additional tree-level contributions to the lightest Higgs mass. Notably, no light stop is present in this framework, and in fact, we require both stops to be above a few TeV to provide sufficient radiative corrections to the lightest Higgs mass to bring it up to 125 GeV. Large CP-violating phases in the gaugino/higgsino sector allow us to match the baryon asymmetry of the Universe with no constraints from electric dipole moments due to R-symmetry. We briefly discuss some of the more interesting phenomenology, particularly of the of the lightest CP-odd scalar.