The Higgs-boson line shape is studied within the pinch technique resum
mation formalism. shown that to one-loop order in perturbation theory
any resonant Higgs-boson amplitude contains a universal part which is
gauge independent, renormalization-group invariant, satisfies the opti
cal and equivalence theorems, and constitutes the natural extension of
the QED effective charge to the case of the Higgs scalar.