An analytical program for fermion pair production in e+e- annihilation

Bardin, Dmitri Yu.; Sachwitz, M.; Lokajicek, M.; Bilenky, Mikhail S.; Olshevsky, A.; Chizhov, A.; Vertogradov, L.; Riemann, T.; Sazonov, A.; Mitselmakher, Guenakh; Gurtu, A.; Ganguli, Som N.; Sheer, I.; Schaile, A.D.; Ridky, J.; Fedorenko, O.; Riemann, S.; Sedykh, Yu.

Report
Report number	hep-ph/9412201 ; CERN-TH-6443-92 ; CERN-TH-6443-92
Title	An analytical program for fermion pair production in e+e- annihilation
Author(s)	Bardin, Dmitri Yu. (Dubna, JINR) ; Bilenky, Mikhail S. (Dubna, JINR ; Bielefeld U. ; Bielefeld U.) ; Chizhov, A. (Dubna, JINR) ; Fedorenko, O. (Petrozavodsk State U.) ; Ganguli, Som N. (Tata Inst.) ; Gurtu, A. (Tata Inst.) ; Lokajicek, M. (Dubna, JINR) ; Mitselmakher, Guenakh (Dubna, JINR) ; Olshevsky, A. (Dubna, JINR) ; Ridky, J. (Dubna, JINR) ; Riemann, S. (DESY) ; Riemann, T. (DESY ; CERN) ; Sachwitz, M. (DESY) ; Sazonov, A. (Dubna, JINR) ; Schaile, A.D. (Freiburg U.) ; Sedykh, Yu. (Dubna, JINR) ; Sheer, I. (UC, San Diego) ; Vertogradov, L. (Dubna, JINR)
Affiliation	(JINR Dubna) ; (Univ. Bielefeld) ; (State Univ. Petrosavodsk) ; (Tata Inst. Bombay) ; (DESY) ; (Inst. H.E.-Phys. Zeuthen) ; (CERN) ; (Albert-Ludwigs-Univ. Freiburg) ; (Univ. Calif. San Diego)
Publication	Geneva : CERN, 1995 - 78.
Subject category	Particle Physics - Phenomenology
Keywords	e+ e-
Abstract	We describe how to use {\tt 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.
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