Decoupling of massive right-handed neutrinos

We investigate the effect of (B + L)-violating anomalous generation of massive right-handled neutrinos on their decoupling, when the right-handed neutrino mass is considerably greater than the right-handed gauge bosom masses. Considering fermion-antifermion annihilation channels, the Lee-Weinberg type of calculation, in this case, gives an upper bound of about 700 GeV, which casts doubt on the existence of such a right-handed neutrino mass greater than right-handed gauge bosom masses. We examine the possibility that a consideration of anomalous effects related to the SU(2)(R) gauge group, together with the effect of WW channels, may turn this into a lower bound similar to 10(2) TeV.