PHOTOS - a universal Monte Carlo for QED radiative corrections: version 2.0

Abstract

This paper documents an update of the PHOTOS algorithm, by E. Barberio, B. van Eijk and Z. Wa̧s, for the Monte Carlo simulation of QED photon radiative corrections in decays. The algorithm is implemented as an independent package written in FORTRAN 77. The program is universal, i.e. it allows for easy interfacing with "any" program generating decays of "any" particle. The program can be used to estimate the size of the QED bremsstrahlung in the leading-logarithmic (collinear) approximation, but it provides final states with their full topology, including kinematical effects due to massive particles. The proper soft-photon behaviour is also reproduced. The algorithm is designed in such a way ..