Electroweak Baryogenesis And The Fermi Gamma-Ray Line
  Many particle physics models attempt to explain the 130 GeV gamma-ray feature
that the Fermi-LAT observes in the Galactic Center. Neutralino dark matter in
non-minimal supersymmetric models, such as the NMSSM, is an especially
well-motivated theoretical setup which can explain the line. We explore the
possibility that regions of the NMSSM consistent with the 130 GeV line can also
produce the observed baryon asymmetry of the universe via electroweak
baryogenesis. We find that such regions can in fact accommodate a strongly
first-order electroweak phase transition (due to the singlet contribution to
the effective potential), while also avoiding a light stop and producing a
Standard Model-like Higgs in the observed mass range. Simultaneously,
CP-violation from a complex phase in the wino-higgsino sector can account for
the observed baryon asymmetry through resonant sources at the electroweak phase
transition, while satisfying current constraints from dark matter, collider,
and electric dipole moment (EDM) experiments. This result is possible by virtue
of a relatively light pseudoscalar Higgs sector with a small degree of mixing,
which yields efficient s-channel resonant neutralino annihilation consistent
with indirect detection constraints, and of the moderate values of $\mu$
required to obtain a bino-like LSP consistent with the line. The wino mass is
essentially a free parameter which one can tune to satisfy electroweak
baryogenesis. Thus, the NMSSM framework can potentially explain the origins of
both baryonic and dark matter components in the Universe. The tightness of the
constraints we impose on this scenario makes it extraordinarily predictive, and
conclusively testable in the near future by modest improvements in EDM and dark
matter search experiments.
