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ClusterHadronizationHandler.h
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// -*- C++ -*-
//
// ClusterHadronizationHandler.h is a part of Herwig++ - A multi-purpose Monte Carlo event generator
// Copyright (C) 2002-2011 The Herwig Collaboration
//
// Herwig++ is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef HERWIG_ClusterHadronizationHandler_H
#define HERWIG_ClusterHadronizationHandler_H
#include <ThePEG/Handlers/HadronizationHandler.h>
#include "PartonSplitter.h"
#include "ClusterFinder.h"
#include "ColourReconnector.h"
#include "ClusterFissioner.h"
#include "LightClusterDecayer.h"
#include "ClusterDecayer.h"
#include "ClusterHadronizationHandler.fh"
namespace Herwig {
using namespace ThePEG;
/** \ingroup Hadronization
* \class ClusterHadronizationHandler
* \brief Class that controls the cluster hadronization algorithm.
* \author Philip Stephens // cerr << *ch.currentEvent() << '\n';
cerr << finalHadrons.size() << '\n';
cerr << "Finished hadronizing \n";
* \author Alberto Ribon
*
* This class is the main driver of the cluster hadronization: it is
* responsible for the proper handling of all other specific collaborating
* classes PartonSplitter, ClusterFinder, ColourReconnector, ClusterFissioner,
* LightClusterDecayer, ClusterDecayer;
* and for the storing of the produced particles in the Event record.
*
* @see PartonSplitter
* @see ClusterFinder
* @see ColourReconnector
* @see ClusterFissioner
* @see LightClusterDecayer
* @see ClusterDecayer
* @see Cluster
* @see \ref ClusterHadronizationHandlerInterfaces "The interfaces"
* defined for ClusterHadronizationHandler.
*/
class ClusterHadronizationHandler: public HadronizationHandler {
public:
/** @name Standard constructors and destructors. */
//@{
/**
* The default constructor.
*/
ClusterHadronizationHandler()
: _minVirtuality2( 0.1*GeV2 ), _maxDisplacement( 1.0e-10*mm )
{}
//@}
public:
/**
* The main method which manages the all cluster hadronization.
*
* This routine directs "traffic". It determines which function is called
* and on which particles/clusters. This function also handles the
* situation of vetos on the hadronization.
*/
virtual void handle(EventHandler & ch, const tPVector & tagged,
const Hint & hint);
/**
* It returns minimum virtuality^2 of partons to use in calculating
* distances. It is used both in the Showering and Hadronization.
*/
Energy2 minVirtuality2() const
{ return _minVirtuality2; }
/**
* It returns the maximum displacement that is allowed for a particle
* (used to determine the position of a cluster with two components).
*/
Length maxDisplacement() const
{ return _maxDisplacement; }
/**
* It returns true/false according if the soft underlying model
* is switched on/off.
*/
bool isSoftUnderlyingEventON() const
{ return _underlyingEventHandler; }
/**
* pointer to "this", the current HadronizationHandler.
*/
static const ClusterHadronizationHandler * currentHandler() {
assert(currentHandler_);
return currentHandler_;
}
public:
/** @name Functions used by the persistent I/O system. */
//@{
/**
* Function used to write out object persistently.
* @param os the persistent output stream written to.
*/
void persistentOutput(PersistentOStream & os) const;
/**
* Function used to read in object persistently.
* @param is the persistent input stream read from.
* @param version the version number of the object when written.
*/
void persistentInput(PersistentIStream & is, int version);
//@}
/**
* Standard Init function used to initialize the interfaces.
*/
static void Init();
protected:
/** @name Clone Methods. */
//@{
/**
* Make a simple clone of this object.
* @return a pointer to the new object.
*/
virtual IBPtr clone() const;
/** Make a clone of this object, possibly modifying the cloned object
* to make it sane.
* @return a pointer to the new object.
*/
virtual IBPtr fullclone() const;
//@}
private:
/**
* Private and non-existent assignment operator.
*/
ClusterHadronizationHandler & operator=(const ClusterHadronizationHandler &);
/**
* This is a pointer to a Herwig::PartonSplitter object.
*/
PartonSplitterPtr _partonSplitter;
/**
* This is a pointer to a Herwig::ClusterFinder object.
*/
ClusterFinderPtr _clusterFinder;
/**
* This is a pointer to a Herwig::ColourReconnector object.
*/
ColourReconnectorPtr _colourReconnector;
/**
* This is a pointer to a Herwig::ClusterFissioner object.
*/
ClusterFissionerPtr _clusterFissioner;
/**
* This is a pointer to a Herwig::LightClusterDecayer object.
*/
LightClusterDecayerPtr _lightClusterDecayer;
/**
* This is a pointer to a Herwig::ClusterDecayer object.
*/
ClusterDecayerPtr _clusterDecayer;
/**
* The minimum virtuality^2 of partons to use in calculating
* distances.
*/
Energy2 _minVirtuality2;
/**
* The maximum displacement that is allowed for a particle
* (used to determine the position of a cluster with two components).
*/
Length _maxDisplacement;
/**
* The pointer to the Underlying Event handler.
*/
StepHdlPtr _underlyingEventHandler;
/**
* Tag the constituents of the clusters as their parents
*/
void _setChildren(ClusterVector clusters) const;
/**
* pointer to "this", the current HadronizationHandler.
*/
static ClusterHadronizationHandler * currentHandler_;
};
}
#endif /* HERWIG_ClusterHadronizationHandler_H */

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