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Manuscript Title: ExHuME 1.3: A Monte Carlo Event Generator for Exclusive Diffraction.
Authors: J. Monk, A. Pilkington
Program title: ExHuME
Catalogue identifier: ADYA_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 175(2006)232
Programming language: C++, some FORTRAN.
Computer: Any computer with UNIX capability. Users should refer to the README file distributed with the source code for further details.
Operating system: Linux, Mac OS X.
RAM: 60 MB
Keywords: Durham Model, Central Exclusive, Monte-Carlo, Diffraction.
PACS: 02.70.Uu, 12.38.-t, 13.85.Hd, 13.88.te.
Classification: 11.2, 11.6.

External routines: LHAPDF [1], CLHEP v1.8 or v1.9 [2]

Subprograms used:
Cat Id Title Reference
ACTU_v2_0 Pythia[3] CPC 135(2001)307
ADHB_v1_0 HDECAY[4] CPC 108(1998)56

Nature of problem:
Central exclusive production offers the opportunity to study particle production in a uniquely clean environment for a hadron collider. This program implements the KMR model [5], which is the only fully perturbative model of exclusive production.

Solution method:
Monte Carlo techniques are used to produce the central exclusive parton level system. Pythia routines are then used to develop a realistic hadronic system.

Restrictions:
The program is, at present, limited to Higgs, di-gluon and di-quark production However, in principle it is not difficult to include more.

Additional comments:
Copies of the code for the two subprograms used, Pythia and HDecay, are included in the distribution package.

Running time:
Approximately 10 minutes for 10000 Higgs events on an Apple 1GHz G4 PowerPC.

References:
[1] http://durpdg.dur.ac.uk/lhapdf/
[2] L. Lönnblad, Comp. Phys. Comm. 84 (1994) 307. http://wwwinfo.cern.ch/asd/lhc++/clhep/}
[3] T. Sjostrand et al, Comp. Phys. Comm. 135 (2001) 238.
[4] A. Djouadi, J. Kalinowski and M. Spira, HDECAY: A program for Higgs boson decays in the standard model and its supersymmetric extension, Comp.\ Phys.\ Comm.\ 108 (1998) 56 (hep-ph/9704448).
[5] V.A.Khoze, A. D. Martin and M. G. Ryskin, Prospects for New Physics observations in diffractive processes at the LHC and Tevatron, Eur. Phys. J. C23 (2002) 311, hep-ph/0111078