PHOJET Home Page
General information
- Program name:
- PHOJET
- Current version:
- 1.10 from Dec. 4th, 1997
- Program size:
- about 38.000 lines
- Author:
- Ralph Engel
- email:
-
Ralph.Engel(at)ik.fzk.de
An update to run the program with the Glück-Reya-Stratmann photon PDF
parametrizations (Phys. Rev. D51 (1995) 3220 and references therein)
can be found here.
Short writeup
Purpose
The Monte Carlo (MC) event generator PHOJET can be used to simulate
hadronic multiparticle production at high energies for
hadron-hadron, photon-hadron, and photon-photon interactions
(hadron = proton, antiproton, neutron, or pion).
The generator includes the photon flux simulation for photon-hadron
and photon-photon processes in lepton-lepton,
lepton-hadron, and heavy ion-heavy ion collisions. In addition, various photon
flux spectra of relevance to planned linear colliders are implemented
(bremsstrahlung, beamstrahlung, laser-backscattering).
In order to simulate hadron and jet production in
photon-nucleus or lepton-nucleus collisions for
real and weakly-virtual photons the MC event generator
DPMJET-III
can be used. DPMJET-III is based on the Gribov-Gauber model of
high-energy hadron-nucleus and nucleus-nucleus collisions and
incorporates an interface to PHOJET.
Physics
The ideas and methods used in the program
are based mainly on the Dual Parton Model (DPM).
In order to combine the DPM on soft processes with the
predictive power of perturbative QCD, the event generator is
formulated as a two-component model (soft and hard component).
On the basis of the optical theorem, Regge phenomenology is used to
parametrize the
total and elastic cross sections as well as a series of partial
inelastic cross sections. In order to preseve s-channel unitarity,
Gribov's Reggeon calculus is applied. Consequently, the model predicts
so called "multiple parton interactions" in one event. Since the unitarization
of soft and hard processes is treated in unified way, multiple soft and
hard interactions may be generated in one event.
Hard scattering processes are simulated using lowest-order perturbative
QCD. Initial state and final state parton showers are generated
in leading-log approximation. Some coherence effects (angular ordering in
the emissions) are taken into account.
For the fragmentation of the parton configurations, the Lund program
JETSET
is used.
Concerning many aspects of the program, the realization of DPM is similar
to the MC event generator DTUJET-93
simulating multiparticle production in proton-proton and
proton-anitproton collisions up to very high energies.
A detailed description of
the physics in PHOJET and various applications of this generator
can be found in the
thesis of the author.
Program code
Currently, the PHOJET program can be obtained by e-mail
request
from the author or via download of the compressed tar
archive (version 1.05c,
1.10). If you send an email to the
author you will get informed regularly about bug-fixes and updates.
User manual
- Version 1.05: physics and manual
(University Siegen preprint 95-05) in one file:
two-page format (about 60 pages) or
standard format (about 120 pages)
- Version 1.10 in preparation,
See also the publications listed at the end of this page.
Some changes between version 1.05c and 1.10 are described
here.
Examples how to use the program
Here, we give the input cards for needed to run the program
(versions 1.04 and 1.05)
for various experimental setups.
-
input file
for proton-antiproton scattering at a collider (CMS)
-
input file
for proton-proton scattering fixed targed setup (LAB)
-
input file
for photoproduction at the HERA ep collider
-
input file
for photoproduction at LEP 2 with electron anti-tagging
-
input file
for photoproduction in heavy-ion collisions
-
input file
for photoproduction via bremsstrahlung at TESLA 500
-
input file
for photoproduction via beamstrahlung at TESLA 500
-
input file
for photoproduction via laser backscattering at TESLA 500
It is important to ensure that the program can
read the file fitpar.dat to initialize the model
parameters correctly.
Parameter tuning
To simplify the model tuning, a short
summary of some important program switches and parameters
has been collected.
Related publications
In the following,
some publications related to the Dual Parton Model and the implementation
of this model in the PHOJET event generator are collected.
- Dual Parton Model
- A. Capella, U. Sukhatme, Chung I Tan and J. Tran Thanh Van:
Dual Parton Model Phys. Rep. 236 (1994) 225
- Event generator DTUJET and related papers
- P. Aurenche, F. W. Bopp, A. Capella, J. Kwiecinski, M. Maire, J. Ranft,
and J. Tran Thanh Van: Multiparticle production in a
two-component dual parton model Phys. Rev. D45 (1992) 92
- R. Engel, F.W. Bopp, D. Pertermann, and J. Ranft:
Extrapolation of hadron cross sections to supercollider
energies within the two-component dual parton model
Phys. Rev. D46 (1992) 5192
- F.W. Bopp, R. Engel, D. Pertermann, and J. Ranft:
New parton structure functions and minijets in the
two-component dual parton model
Phys. Rev. D49 (1994) 3236
- J. Ranft: The Dual Parton Model at cosmic ray energies
Phys. Rev. D51 (1995) 64
- Event generator PHOJET and related papers
- R. Engel: Photoproduction within the two-component Dual Parton Model:
Amplitudes and Cross Sections Z. Phys. C66 (1995) 203
- R. Engel and J. Ranft, and S. Roesler:
Hard diffraction in hadron-hadron interactions and in
photoproduction Phys. Rev. D52 (1995) 1459
- R. Engel and J. Ranft: Hadronic photon-photon collisions at
high energies Phys. Rev. D54 (1996) 4244
- R. Engel, M.A. Braun, C. Pajares, and J. Ranft:
Diffraction dissociation, an important background to
photon-photon collisions via heavy ion beams at LHC
Z. Phys. C74 (1997) 687
- Photoproduction off nuclei (DTUNUC with interface to PHOJET)
- R. Engel, J. Ranft, and S. Roesler:
Photoproduction off nuclei and point-like photon interactions,
cross sections and nuclear shadowing
Phys. Rev. D55 (1997) 6957
- S. Roesler, R. Engel, and J. Ranft:
Photoproduction off nuclei: particle and jet production
Phys. Rev. D57 (1998) 2889
Comments or suggestions are welcome.
Ralph Engel
Apr 20th, 1998