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Preditions of ZFITTER v.6 for fermion-pair production with acollinearity cut

Bishop Konstantin Preslavsky Univ., Shoumen (Bulgaria). Faculty of Physics)
Jack, M.
Riemann, S.
Riemann, T. (Deutsches Elektronen-Synchrotron (DESY), Zeuthen (Germany))
Christova, P. (Joint Inst. for Nuclear Research, Dubna (Russian Federation). Lab. of Nuclear Problems
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)

Publication date

January 1999

Abstract

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/S...

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