TOPAZO 4.0 - A new version of a computer program for evaluation of deconvoluted and realistic observables atr LEP 1 and LEP 2

The program TOPAZO was developed for computing a variety of physical observables which are related to the e(+)e(-) annihilation into fermion pairs and to the large angle Bhabha scattering around the Z resonance. Among them the Z parameters or pseudo-observables, the deconvoluted cross sections and those dressed with QED radiation, and finally the forward-backward asymmetries; The calculations are performed both for a completely inclusive experimental setup and for a realistic one, i.e. a setup with cuts on the acollinearity angle, on the energy of the outgoing fermions or on their invariant mass and angular acceptance. The new version, 4.0, includes several innovative features; First of all, the most important new capabilities since previous versions are electroweak, QCD and QED correction factors that are relevant at the Z resonance in the light of the present experimental accuracy. Among them, the effect of the next-to-leading O(alpha(2)m(2),) corrections, the radiative corrections to the hadronic decay of the Z, providing complete corrections of O(alpha alpha(s)) to Gamma (Z --> q (q) over bar) with q = u, d, s, c, and b, and leading O(alpha(3)) QED corrections. Secondly, the program has been upgraded to cover two-fermion final states at LEP 2 energies, where some of the assumptions made for earlier versions are no longer valid. In particular, to this aim all the electroweak radiative corrections relevant far from the Z peak have been added for s-channel processes, e.g, purely weak boxes, next-to-leading O(alpha(2)) and leading O(alpha(3)) QED corrections. (C) 1999 Published by Elsevier Science B.V.