%0 Journal Article
%T ZFITTER -- An Analytical Program for Fermion Pair Production in e+e- Annihilation
%A D. Bardin
%A M. Bilenky
%A A. Chizhov
%A O. Fedorenko
%A S. Ganguli
%A A. Gurtu
%A M. Lokajicek
%A G. Mitselmakher
%A A. Olshevsky
%A J. Ridky
%A S. Riemann
%A T. Riemann
%A M. Sachwitz
%A A. Sazonov
%A A. D. Schaile
%A Yu. Sedykh
%A I. Sheer
%A L. Vertogradov
%J Physics
%D 1994
%I arXiv
%X We describe how to use ZFITTER, a program based on a semi-analytical approach to fermion pair production in e+e- annihilation and Bhabha scattering. A flexible treatment of complete ${\cal O}(\alpha)$ QED corrections, also including higher orders, allows for three calculational {\bf chains} with different realistic sets of restrictions in the photon phase space. {\tt ZFITTER} consists of several {\bf branches} with varying assumptions on the underlying hard scattering process. One includes complete ${\cal O}(\alpha)$ weak loop corrections with a resummation of leading higher-order terms. Alternatively, an ansatz inspired from S-matrix theory, or several model-independent effective Born cross sections may be convoluted. The program calculates cross sections, forward-backward asymmetries, and for $\tau$~pair production also the final-state polarization. Various {\bf interfaces} allow fits to be performed with different sets of free parameters.
%U http://arxiv.org/abs/hep-ph/9412201v3