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Manuscript Title: PHOTOS: a universal Monte Carlo for QED radiative corrections: version 2.0.
Authors: E. Barberio, Z. Was
Program title: PHOTOS, version: 2.0
Catalogue identifier: ABZI_v2_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 79(1994)291
Programming language: Fortran.
Computer: IBM 3090.
Operating system: VM/CMS, VMS, ULTRIX, UNIX.
Word size: 32
Keywords: Particle physics, Radiative corrections, Heavy leptons, Resonances, Particle decays, Monte carlo simulation, Quantum electrodynamics, Leading-log Approximations, Elementary.
Classification: 11.4.

Nature of problem:
Most of the decay modes of particles or resonances are accompanied by the QED real photon corrections. The presence of (a) hard photon(s) may affect the shape of the measured distributions, detection efficiencies and/or experimental selection criteria.

Solution method:
The Monte Carlo simulation is best suited for studying the combined process of production and decay of unstable particles, including QED corrections and detector effciencies.

The QED O(alpha) and O(alpha**2) corrections are implemented in the leading-logarithm approximation with the proper soft photon behaviour. Emission of non-collinear hard photons is simulated, but the validity of distribution may be restricted.

Running time:
500 events/sec (VAX station 4000-90) for the Z -> mu+mu- decay mode.