Leptogenesis from Oscillations of Heavy Neutrinos with Large Mixing
  Angles
  The extension of the Standard Model by heavy right-handed neutrinos can
simultaneously explain the observed neutrino masses via the seesaw mechanism
and the baryon asymmetry of the Universe via leptogenesis. If the mass of the
heavy neutrinos is below the electroweak scale, they may be found at the LHC,
BELLE II, NA62, the proposed SHiP experiment or a future high-energy collider.
In this mass range, the baryon asymmetry is generated via CP-violating
oscillations of the heavy neutrinos during their production. We study the
generation of the baryon asymmetry of the Universe in this scenario from first
principles of non-equilibrium quantum field theory,including spectator
processes and feedback effects. We eliminate several uncertainties from
previous calculations and find that the baryon asymmetry of the Universe can be
explained with larger heavy neutrino mixing angles, increasing the chance for
an experimental discovery. For the limiting cases of fast and strongly
overdamped oscillations of right-handed neutrinos, the generation of the baryon
asymmetry can be calculated analytically up to corrections of order one.
