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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.

Restrictions:
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.