TOPAZ0 2.0: a Program for Computing Deconvoluted and Realistic Observables around the $Z^{0}$ Peak

The program {\tt TOPAZ0} is designed for computing Z^0 parameters, de-convoluted and QED-dressed cross sections and forward-backward asymmetries of e^+ e^- annihilation into fermion pairs and of Bhabha scattering around the Z^0 peak, over both a completely inclusive experimental set-up and a realistic one, i.e. with cuts on acollinearity, energy or invariant mass and angular acceptance of the outgoing fermions. The new version, 2.0, offers the possibility of imposing different experimental cuts on cross sections and forward-backward asymmetries in a single run, and includes radiative corrections whose effect can become relevant in view of the present and foreseen experimental accuracy. Moreover, an additional option is included, which allows an estimate of the theoretical uncertainty due to unknown higher-order effects, both of electroweak and QCD origin. With respect to the version 1.0, the code is available in the form of {\tt SUBROUTINE}, in order to render more viable the use of the program for aims not planned by the {\tt TOPAZ0} package itself.