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Manuscript Title: Monte Carlo simulation of the diffractive excitation model.
Authors: J. Kasman
Program title: DEM
Catalogue identifier: ABCK_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 9(1975)182
Programming language: Fortran.
Computer: IBM 360/195.
Operating system: MVT REL. 21 HASP VERSION 3.1.
RAM: 48K words
Word size: 32
Keywords: High energy, Particle physics, Elementary particles, Multiparticle production, Diffractive excitation, Proton, Nova, Monte carlo simulation, Empirical model.
Classification: 11.6.

Nature of problem:
The diffractive excitation model for multiparticle production in proton-proton collisions provides a framework for the calculation of experimentally observable distributions, both inclusive and exclusive. The dynamics occurs in two steps: (1) excitation of the proton into a massive cluster (2) de-excitation of the diffractive cluster by the subsequent emission of pions. Events are characterized by the 4- momenta of two nucleons and the decay pions.

Solution method:
Importance sampling techniques are used in the Monte Carlo simulation of a random event. The events may be analyzed exactly like those from an experimental data summary tape.

Restrictions:
Only pions are produced, with an upper limit of 200 pions per cluster.

Unusual features:
All events respect exact kinematic constraints, being generated from tree diagrams, as in the CERN phase-space routine FOWL. Events must be used in sets, each consisting of a fixed number (NUMB) of decay events.

Running time:
1.7*10**-3 sec/event at pINC = 30 GeV/c, 1.0 X 10**-2 s/event at pINC= 1100 GeV/c.