PROGRAM SUMMARY
Title of program:
ZFITTER version 6.21
Catalogue identifier:
ADMJ
Ref. in CPC:
133(2001)229
Distribution format: tar gzip file
Operating system: UNIX, HP-UX, Linux
High speed store required:
2MK words
Number of lines in distributed program, including test data, etc:
23893
Keywords:
Elementary particle physics, QCD, Electrodynamics quantum,
Standard model, Electroweak interactions, Heavy boson Z,
e+e- -annihilation, Radiative corrections, Initial-state radiation
(ISR), Final state radiation (FSR), Interference QED, LEP1, LEP2,
Linear collider, TESLA.
Programming language used: Fortran
Computer:
Pentium II PC (400MHz) .
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.
Method of solution:
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.
Typical 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.