Abstract
The electroweak radiative correction parameter T= δρ ∗ α is estimated in dynamical models such as technicolour and fourth family condensate models in the presence of Majorana neutrino masses. The parameter T is calculated in lowest order dynamical perturbation theory from a generalisation of the Pagel-Stokar formulae. Parameter ranges exist that give negative values of T which may help to alleviate problems with technicolour models with orthogonal technicolour groups, SO( N) TC.
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