On suppressing the Higgsino-mediated proton decay in SUSY SO(10) GUT's

Using the freedom in SO(10) GUT's one can generalize the existing models without changing the mass spectrum of fermions to obtain a significant suppression of proton decay resulting from the dimension 5 operators with ΔB≠0. In some limiting cases, these operators can be made negligible compared to dimension 6 operators resulting from the heavy gauge bosons exchange.