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 observ ables which are related to the e(+)e(-) annihilation into fermion pairs and to the large angle Bhabha scattering around the Z resonance. Among them th e Z parameters or pseudo-observables, the deconvoluted cross sections and t hose dressed with QED radiation, and finally the forward-backward asymmetri es; The calculations are performed both for a completely inclusive experime ntal setup and for a realistic one, i.e. a setup with cuts on the acollinea rity angle, on the energy of the outgoing fermions or on their invariant ma ss and angular acceptance. The new version, 4.0, includes several innovativ e features; First of all, the most important new capabilities since previou s versions are electroweak, QCD and QED correction factors that are relevan t at the Z resonance in the light of the present experimental accuracy. Amo ng them, the effect of the next-to-leading O(alpha(2)m(2),) corrections, th e 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 pr ogram 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 val id. In particular, to this aim all the electroweak radiative corrections re levant far from the Z peak have been added for s-channel processes, e.g, pu rely weak boxes, next-to-leading O(alpha(2)) and leading O(alpha(3)) QED co rrections. (C) 1999 Published by Elsevier Science B.V.