Abstract
Chang, Mohapatra and Parida (CMP) have recently examined a scenario within SO(10) grand unified theories wherein the breaking of SU(2) R and parity are decoupled thus allowing for the existence of a low right-handed mass scale. We extend the CMP analysis to include the effects of global supersymmetry (SUSY) on the one-loop renormalization group equations. Demanding sin 2 θ w ≈- 0.22 and τ p > 5 τ p (SU(5)) we find strong constraints on both the parity breaking and right-handed mass scales in these theories. The SUSY breaking scale is found to be quite high, comparable to the unification scale; minimal fine-tuning is assumed. Models compatible with current experiment are found if only the usual (i.e., non-SUSY) dimension-six operators contribute to proton decay. All these models have a heavy (⩾ 10 8 GeV) right-handed mass scale associated with them.
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