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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.

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.