We study 2 \rightarrow n inelastic fermion- ( anti ) fermion scattering into multiple longitudinal weak gauge bosons and derive universal upper bounds on the scales of fermion mass generation by imposing unitarity of the S -matrix .
We place new upper limits on the scales of fermion mass generation , independent of the electroweak symmetry breaking scale .
We find that the strongest 2 \rightarrow n limits fall in a narrow range , 3 - 170 TeV ( with n = 2 - 24 ) , depending on the observed fermion masses .