Abstract
In contrast to the conclusion for an SO(10) model including gravity induced correction through a five-dimensional operator we note that low-mass right-handed gauge bosons are ruled out as the parity restoring gauge group SU(2) L × SU(2) R × U(1) B− L × SU(3) C ( g 2L = g 2R) is not allowed at low-mass scales. Using the mechanism of decoupling parity and SU(2) R breakings the low-mass right-handed gauge bosons ( M R ∼ 100 GeV-10TeV) without observable parity restoration are found to be permitted when the five-dimensional operator is scaled by the compactification mass.
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