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(Last update: 16-Apr-2002)
THIS FILE CONTAINS SOME INFORMATION ABOUT THE CLASS STRUCTURE
IN THIS DIRECTORY, AND SOME NOTES ABOUT THE CLASSES.
--- Class Structure. The main class is *ClusterHadronizationHandler*
It interacts with the following classes:
*PartonSplitter*
*ClusterFinder*
*ColourReconnector*
*ClusterFissioner*
*LightClusterDecayer*
*ClusterDecayer*
all of these classes uses the fundamental (low-level) classes:
*Cluster*
*Component*
Furthermore *ClusterFissioner*, *LightClusterDecayer*, and *ClusterDecayer*
use the class *HadronsSelector*.
--- Class: *PartonSplitter* has still empty methods for the
splitting of space-like and/or space-like with sea quark.
--- Beam clusters: all the clusters are contained in the container
_collecCluPtr in the main driver class ClusterHadronizationHandler,
including the beam clusters (defined as clusters having at least one
beam remnant between their components) which can be identified by
the logical method Cluster::isBeamCluster(). These beam clusters
are properly treated in the Cluster Hadronization if the soft
underlying event is switched off. In the case it is switched on,
the beam clusters are tagged as not available (that is the logical
method Cluster::isAvailable() returns false), and are ignored
during the hadronization (although present in _collecCluPtr).
When, in the future, the soft underlying event is implemented,
it will be necessary, in some way, to pass these beam clusters
from ClusterHadronizationHandler to the class responsible for
the soft underlying event. It should be quite straightforward!
--- Class: *LightClusterDecayer* the choice of the candidate
reshuffling partner cluster, with whom the light cluster exchanged
momenta, is based on the minimal space-time distance from the
light cluster, between the available clusters.
--- Extensive debugging information on the full Cluster Hadronization
are produced by running with the switch -dHw10 for example:
runHerwig.exe -dHw10 SimpleLEP.run
(or even more with: -dHw100)
The debugging information are then in SimpleLEP.log.
Notice that you can also control the number of events (max
default is 10000) with -N , for example:
runHerwig.exe -N 100 -dHw 10 SimpleLEP.run
--- The class *HadronsSelector* , which implements Kupco's
method for the selection of a pair of hadrons giving the
flavour of the cluster, contains all hadrons as in PDG 2000.
However, because at the moment Pythia7 does not include
many of them, you can either comment out the lines
corresponding to the missing particles, or uncomment (use)
them, but in the latter case you will get a (single)
warning during initialization ( which means when running:
$ setupHewig.exe SimpleLEP.in ) saying that such particles
are not found in Pythia7 and therefore they will not be produced
(i.e. their overall weights are set to zero).

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