Diffraction in Pythia
The PYTHIA program can be used to generate high-energy-physics 'events'
with sets of outgoing particles produced in the interactions between two
incoming particles. The objective is to provide a representation, as
accurate as possible, of event properties in a wide range of reactions.
One such reaction, that is not well understood is Diffraction. Among the
several alternative approaches that have been proposed, in PYTHIA, we
follow a fairly conventional Pomeron based one, but fully integrated to
use the standard PYTHIA machinery for multiple interactions, parton
showers and hadronization. This note reports the development in PYTHIA in
the way diffraction is modeled without providing specific details for
usage. Results are compared with an alternative event generator called
PHOJET. The code and further information may be found on the Pythia web
LU TP 09-23