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Manuscript Title: DPEMC: A Monte-Carlo for Double Diffraction
Authors: M. Boonekamp, T. Kúcs
Program title: DPEMC version 2.4
Catalogue identifier: ADVF_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 167(2005)217
Programming language: FORTRAN 77.
Computer: any computer with the FORTRAN 77 compiler under the UNIX or Linux operating systems.
Operating system: UNIX; Linux.
RAM: 25 MB
Keywords: Proton-(anti)proton collisions, diffraction, double pomeron exchange, double photon exchange.
PACS: 12.40.Nn, 13.85.-t.
Classification: 11.2, 11.6.

Nature of problem:
Proton diffraction at hadron colliders can manifest itself in many forms, and a variety of models exist that attempt to describe it [1, 2, 3, 4, 5]. This program implements some of the more significant ones, enabling the simulation of central particle production through color singlet exchange between interacting protons or antiprotons.

Solution method:
The Monte-Carlo method is used to simulate all elementary 2 → 2 and 2 → 1 processes available in HERWIG. The color singlet exchanges implemented in DPEMC are implemented as functions reweighting the photon flux already present in HERWIG.

The program relying extensively on HERWIG, the limitations are the same as in [6].

Running time:
Approximate times on a 800 MHz Pentium III : 5-20 minutes per 10000 unweighted events, depending on the process under consideration.

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