Baryogenesis from Mixing of Lepton Doublets
  It is shown that the mixing of lepton doublets of the Standard Model can
yield sizeable contributions to the lepton asymmetry, that is generated through
the decays of right-handed neutrinos at finite temperature in the early
Universe. When calculating the flavour-mixing correlations, we account for the
effects of Yukawa as well as of gauge interactions. We compare the freeze-out
asymmetry from lepton-doublet mixing to the standard contributions from the
mixing and direct decays of right-handed neutrinos. The asymmetry from lepton
mixing is considerably large when the mass ratio between the right-handed
neutrinos is of order of a few, while it becomes Maxwell-suppressed for larger
hierarchies. For an intermediate range between the case of degenerate
right-handed neutrinos (resonant Leptogenesis) and the hierarchical case,
lepton mixing can yield the main contribution to the lepton asymmetry.
