Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-08-06
Physics
High Energy Physics
High Energy Physics - Phenomenology
28 pages, Latex2e, 16 figures, 8 tables; uses sprocl_mod.sty (included), rotating, epsfig, graphicx
Scientific paper
ZFITTER is a Fortran package for the description of fermion-pair production in e+e- annihilation. We report on results of a rederivation of the complete set of analytical O(alpha) formulae for the treatment of photonic corrections to the total cross-section and the integrated forward-backward asymmetry with combined cuts on acollinearity angle, acceptance angle, and minimal energy of the fermions. Numerically, the following changes result in ZFITTER v. 6.11 compared to ZFITTER v. 5.20/21: (i) at the Z resonance -- numerical changes are negligible; (ii) at LEP 1 energies off-resonance -- corrections amount to at most few per mil; (iii) at LEP 2 energies -- corrections amount to one per cent or less. Thus, the predictions for LEP/SLC data remain unchanged within the actual errors.
Christova Penka
Jack Mark
Riemann Sabine
Riemann Tord
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