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Manuscript Title: ZFITTER v6.21, a semi-analytical program for fermion pair production in e+e- annihilation.
Authors: D. Bardin, M. Bilenky, P. Christova, M. Jack, L. Kalinovskaya, A. Olchevski, S. Riemann, T. Riemann
Program title: ZFITTER version 6.21
Catalogue identifier: ADMJ_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 133(2001)229
Programming language: Fortran.
Computer: Pentium II PC (400MHz).
Operating system: UNIX, HP-UX, Linux.
RAM: 2M words
Keywords: Elementary, Particle physics, QCD, Quantum electrodynamics, Standard model, Electroweak interactions, Heavy boson Z, e+e- -annihilation, Radiative corrections, Initial-state radiation (ISR), Final state radiation (FSR), QED interference, LEP1, LEP2, Linear collider, TESLA.
Classification: 11.5.

Nature of problem:
Fermion pair production is important for the study of the properties of the Z-boson and for precision tests of the Standard Model at LEP and future linear colliders at higher energies. QED corrections and combined electroweak and QCD corrections have to be calculated for this purpose with high precision, including higher order effects. For multi-parameter fits a program is needed with sufficient flexibility and also high calculational speed. ZFITTER combines the two aspects by at most one-dimensional numerical intergrations and a variety of flags, defining the physics contents used. The Standard Model predictions are typically at the per mille precision level, sometimes better.

Solution method:
Numerical integration of analytical formulae.

Restrictions:
Fermion pair production is described below the top quark production threshold. Photonic corrections ar taken into account with relatively simple cuts on photon energy, or the energies and acollinearity of the two fermions, and one fermion production angle. Bhabha scattering is treated poorly.

Running time:
On a Pentium II PC installation (400 MHz), Linux 2.0.34, approximately 140 sec are needed to run the standard test with subroutine ZFTEST. This result is for a default/recommended setting of the input parameters, with all corrections in the Standard Model switched on. ZFTEST computes 12 cross-sections and cross-section asymmetries for 8 energies with 5 interfaces, i.e. about 360 cross-sections in 140 seconds.