PROGRAM SUMMARY
Title of program:
POMWIG 1.1
Catalogue identifier:
ADPP
Ref. in CPC:
144(2002)104
Distribution format: tar gzip file
Operating system: Red Hat, SUSE Linux
High speed store required:
9MK words
Number of lines in distributed program, including test data, etc:
7009
Keywords:
Diffraction, Monte Carlo simulation, Pomeron, Elementary
particle physics, Event simulation.
Programming language used: Fortran
CPC Program Library subprograms used:
Cat. Id. Title Ref. in CPC ACBY HERWIG 5.1 67(1992)465
Nature of physical problem:
The nature of the pomeron, a strongly interacting colorless exchange,
has been studied widely in both proton-proton and electron-proton
collisions. Factorizable models, in which the proton 'emits' a pomeron
which undergoes a hard interaction with the other beam particle, have
met with considerable success in electron-proton collisions [2],
although their applicability in proton-proton collisions is as yet
uncertain. In understanding the nature of diffraction experimentally,
it is crucial to have a full simulation not only of the underlying
dynamics, but also of the hadronic final state. A full Monte Carlo
generator is therefore necessary to understand both the experimental
data and to test factorizable models in detail.
Method of solution:
POMWIG implements the factorizable pomeron model into the HERWIG Monte
Carlo generator [1]. This allows diffractive collisions to be generated
using all hard sub-processes available in HERWIG, with a range of beam
particles, and for a full simulation of the hadronic final state.
Subleading (reggeon) exchanges are also implemented. The structure of
the exchange and the nature of the flux factors are user definable.
The routines supplied will function with all currently available
versions of HERWIG [1] from 5.9 onwards.
Restrictions:
The factorizable model of diffraction is fully implemented. POMWIG
allows the user to implement arbitrarily complex structure functions and
flux factors.
Typical running time:
Dependent on the hard subprocess and center of mass energy of the
incoming particles, but similar to HERWIG.
Unusual features:
None.
References:
[1] G. Marchesini et al., Comp. Phys. Comm. 67 (1992) 465; G. Corcella
et al., JHEP 0101 (2001) 010
(http://hepwww.rl.ac.uk/theory/seymour/herwig/)
[2] H1 Collaboration: C. Adloff et al., Z.Phys. C74 (1997) 221.