Monte Carlo simulation of the diffractive excitation model

✍ Scribed by J. Kasman

• Publisher: Elsevier Science
• Year: 1975
• Tongue: English
• Weight: 649 KB
• Volume: 9
• Category: Article
• ISSN: 0010-4655
• DOI: 10.1016/0010-4655(75)90105-8

✦ Synopsis

Title of program: DEM Nature of physical problem The diffractive excitation model for multiparticle production Catalogue number: ABCK in proton-proton collisions provides a framework for the calculation of experimentally observable distributions [1], both in-Program obtainable from: CPC program library, Queen's clusive and exclusive. The dynamics occurs in two steps: University of Belfast, N. Ireland (see application form in this

(1) excitation of the proton into a massive cluster issue).

(2) de-excitation of the diffractive cluster by the subsequent emission of pions. Computer: IBM 360/195; Installation: Rutherford Lab., Didcot, Events are characterized by the 4-momenta of two nucleons UK and the decay pions.

Operating system: MVT Rel. 21 HASP Version 3.1

Method of solution

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

High speed storage required: 48K words

Restrictions on the complexity of the problem No. of bits in a word: 32

Only pions are produced, with an upper limit of 200 pions per cluster. Overlay structure: None Typical running time No. of magnetic tapes required: None 1.7 x 10~sec/event atpINC = 30GeV/c, 1.0 X lIT 2 sec/event atpINC = 1100 GeV/c. Otherperipherals used: Line printer Unusual features of the program No. of cards in combined program and test deck: 689 All events respect exact kinematic constraints, being generated from tree diagrams, as in the CERN phase-space routine FOWL Cardpunching code: EBCDIC [2]. Events must be used in sets, each consisting of a fixed number (NUMB) of decay events.