Z-peak subtracted representation of four-fermion processes at futuree+e−colliders

We propose a representation of four-fermion processes at one loop, at variable c.m. energy, in which the theoretical input contains certain quantities measured on top of the Z resonance at CERN LEP 1 and SLC, rather than the more familiar input parameter ${\mathit{G}}_{\mathrm{\mu }}$. This choice allows the calculation of the ‘‘residual’’ one-loop expressions in a way that exhibits interesting properties for cases of new physics, as shown with two specific examples of models of technicolor-type and of models with anomalous triple gauge couplings.