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GENERATORS for US/Canada Linear Collider Simulation Project
This page describes the Monte Carlo generators thought to be
best-suited for the US/Canada study. An extensive list of Monte Carlo
generators for Linear Collider studies can also be found here.
Index:
Please send comments on these pages to Tim
Barklow.
Beamstrahlung and Initial State Radiation
- We recommend that you use the
PANDORA
simulation of beamstrahlung and initial state bremsstrahlung for those
processes simulated by PANDORA. In order to output PANDORA events in
STDHEP format and to simulate final state gluon showering and
fragmentation use the package PANDORA_PYTHIA
For processes not simulated by PANDORA we recommend that you use PYBMS.
The PYBMS program is interfaced to PYTHIA
version 5.7 . A sample
shell script containing an interface to PYTHIA and NLC machine
parameters for Ecm=0.5, 1.0, 1.5 TeV is included in the PYBMS
package.
Standard Model 2-fermion Production
PANDORA_PYTHIA
should be used. Electron beam polarization is simulated.
Standard Model 4-fermion Production
- 4-Fermion final states arising from e+e- --> ZZ, eeZ, enuW can be
simulated with
PYTHIA
(subprocesses 22, 35, 36 respectively). Electron beam polarization is
not simulated.
4-Fermion final states arising from e+e- --> WW can also be
simulated with PYTHIA
(subprocess 25), but electron beam polarization and anomalous WWZ/WWgamma
couplings are not included. We therefore recommend that the WWHP Monte
Carlo program be used for this purpose. WWHP simulates e+e- --> W+W-
--> f1 f2 f3 f4 at tree level with electron beam polarization, finite
W width, full electroweak decay correlations and anomalous WWZ and
WWgamma couplings included. WWHP has been incorporated into the PYBMS
package as subprocess 192.
Other 4-fermion processes can be simulated with PANDORA_PYTHIA.
You will have to interface a function that calculates the differential
cross-section for e+e- --> f1 f2 f3 f4 to PANDORA to do this. Please
see the PANDORA
documention for instructions on how to add your own processes to
PANDORA.
Standard Model 6-fermion Production
- 6-fermion processes can be simulated with
PANDORA_PYTHIA.
You will have to interface a function that calculates the differential
cross-section for e+e- --> f1 f2 f3 f4 f5 f6 to PANDORA to do this.
Please see the PANDORA
documention for instructions on how to add your own processes to
PANDORA.
Gamma-Gamma Processes
- We recommend that you use the
BBHAD
simulation of gamma gamma production of hadrons and lepton pairs at an
e+e- linear collider. A sample
shell script containing adjustable gamma gamma --> hadron
parameters and NLC machine parameters for Ecm=0.5, 1.0, 1.5 TeV is
included in the BBHAD
package.
Top Quark
PANDORA_PYTHIA
should be used. Electron beam polarization is simulated.
Supersymmetry
ISAJET should
be used for supersymmetry event generation. See also the ISAJET
manual. Electron beam polarization is simulated, and beamstrahlung
and initial state bremsstrahlung are included in ISAJET versions 7.42
and beyond. Supersymmetry reactions, without account for beam
polarization, are also included in recent versions of PYTHIA.
Higgs Bosons
PYTHIA
should be used in combination with PYBMS.
Electron beam polarization is not simulated.
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