PYBMS

PYBMS adds beamstrahlung and initial state bremsstrahlung to any process in the PYTHIA version 5.7 program.

Beamstrahlung is simulated with the Pisin Chen approximation in Phys.Rev.D46:1186-1191,1992.
Bremsstrahlung is simulated with the Fadin-Kuraev electron distribution function Sov.J.Nucl.Phys.41:466-472,1985.
In addition to the standard PYTHIA processes, a subprocess msub(191)=1 is defined which indicates that 4-vectors generated by the GRACE/BASES/SPRING Monte Carlo package are to be used as the parton 4-vectors in PYTHIA.
A *.tar.gz file containing the source code, Makefile, and sample shell script for PYBMS can be found here.