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Manuscript Title: GENTLE/4fan v. 2.O, a program for the semi-analytic calculation of predictions for the process e+e- -> 4f.
Authors: D. Bardin, J. Biebel, D. Lehner, A. Leike, A. Olchevski, T. Riemann
Program title: GENTLE/4fan v. 2.0
Catalogue identifier: ADGA_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 104(1997)161
Programming language: Fortran.
RAM: 0.5M words
Word size: 32
Keywords: Particle physics, Elementary, Event simulation, E+e- annihilation qed, Higher order corrections, Four-fermion production, Ww, Zz, Zgamma, Gamma gamma, Zh production.
Classification: 11.2.

Nature of problem:
Description of two-boson production in e+e- annihilation at high energies with selected possible background contributions; initial state QED corrections (ISR); selected final state corrections; anomalous triple gauge boson couplings.

Solution method:
Semi-analytic; numerical integration of analytic formulae: (i) Born approximation: Numerical integrations over two virtualities s1, s2 plus optionally over the boson production angle theta; (ii) QED corrections in the flux function approach (FF): one additional numerical integration over virtuality s'; (iii) QED corrections in the structure function approach (SF): alternatively to (ii), two additional numerical integrations over x1, x2.

Only selective experimental cuts are possible; the program calculates total cross-sections and the distribution in the boson production angle; background contributions are available only for selected final state configurations; no inclusion of pure weak corrections.

Running time:
The running time strongly depends upon the options used; one finds e.g.: Born cross-section on-shell: below one sec., off-shell: few secs.; LLA QED corrections (FF) on-shell: few secs.; off-shell: few mins.; LLA QED corrections (SF) on-shell: few secs.; off-shell: several mins.; complete ISR (FF): on-shell: few mins., off-shell: several hours; with background: from few secs. (no QED) to several hours (with QED); with anomalous couplings: from few secs. (no QED) to several mins. (with QED).