  We propose a new scenario for predicting a one-loop neutron-antineutron
oscillation at a testable level, meanwhile, realizing a thermal or inflationary
baryogenesis at a very high scale. Besides the standard model content, this
scenario involves two real singlet scalars with very heavy masses, two
color-triplet and iso-singlet scalars at the TeV scale, as well as a Majorana
singlet fermion for a dark matter candidate.
