  A baryogenesis scenario in supersymmetric standard models with Dirac
neutrinos proposed by Abel and Page is reconsidered with introducing
intermediate scale physics to stabilize the runaway potential along a
right-handed sneutrino direction. In contrary with previous results, the baryon
number asymmetry can be explained even for higher reheating temperature without
entropy production if the lightest neutrino mass is small and/or thermal
effects induce early oscillation. We discuss the solution to the problem of
dark matter overproduction by the right-handed sneutrino decay by SU(2)_R gauge
interaction.
