Supersymmetric SU(2)(L)xSU(2)(R)xSU(4)(c) and observable neutron-antineutron oscillations - art. no. 055004

We show that in a large class of supersymmetric SU(2)(L) X SU(2)(R) X SU(4) (c) models with the seesaw mechanism for neutrino masses and an R-parity-co nserving vacuum there are diquark Higgs bosons with masses (M-qq) near the weak scale even though the scale of SU(2)(R) X SU(4)(c) symmetry breaking i s around 10(10) GeV. This happens because these masses (M-qq) arise out of higher dimensional operators needed to stabilize the charge-conserving vacu um in the model. This feature has the interesting implication that the Delt a B = 2 processes such as neutron-antineutron oscillations can have observa ble rates while at the same time yield neutrino masses in the range of curr ent interest. [S0556-2821(98)05423-X].