Abstract
In many grand unified models as well as in many horizontal symmetry schemes fermion mass relations of the form mc/mt/mt,... = mµ/mτ/mL ... = ms/mb/mb, ... are expected. A gauge independent formulation for the effective quark mass based on the momentum substraction scheme is used to compute the naked t-threshold with the result: 2Mt = 51 ± 1 GeV. If the fourth charged lepton is at 30 GeV, the fourth generation quark masses are found to be Mb, ~ 73 ± 3 GeV, Mt, ~ 360 ± 10 GeV.
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