Z-peak subtracted representation of Bhabha scattering and search for new   physics effects
  We extend to the special case of Bhabha scattering the "Z-peak subtracted" representation previously applied to e+e- to f f(bar) (f different from e). This allows us to analyze the process at any energy while imposing in an automatic way the constraints set by high precision measurements at the Z peak. The procedure turns out to be particularly convenient for the search of a certain class of new physics effects at variable energy. A few examples are considered and the information thus obtained is combined with the corresponding one that can be derived from the other e+e- annihilation processes, both at present (LEP2) and at future colliders. This shows that the role of Bhabha scattering in this respect can be quite relevant. 
M. Beccaria, F.M. Renard, S. Spagnolo and C. Verzegnassi