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Manuscript Title: PHOTOS: a universal Monte Carlo for QED radiative corrections in decays.
Authors: E. Barberio, B. van Eijk, Z. Was
Program title: PHOTOS version 1.3
Catalogue identifier: ABZI_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 66(1991)115
Programming language: Fortran.
Computer: IBM 3090, VAX.
Operating system: VM/CMS, VMS, ULTRIX.
RAM: 5K words
Word size: 32
Keywords: Particle physics, Elementary, Radiative corrections, Heavy leptons, Resonances, Particle decays, Monte carlo simulation, Quantum electrodynamics, Leading-log Approximations.
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 may affect shape of the measured distributions, detection efficiencies and/ or experimental selection criteria.

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

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

Running time:
140 events/sec (VAX8350) for the Z-> mu+mu- decay mode.