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// -*- C++ -*-
//
// ClusterFinder.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_ClusterFinder_H
#define HERWIG_ClusterFinder_H
#include <ThePEG/Interface/Interfaced.h>
#include "CluHadConfig.h"
#include "ClusterFinder.fh"
namespace Herwig {
using namespace ThePEG;
/*! \ingroup Hadronization
* \class ClusterFinder
* \brief This class forms clusters from the partons produced in the Shower.
* \author Philip Stephens
* \author Alberto Ribon
*
* This class scans through the particles in the event and produces a
* collection of clusters, defined as a colour-singlet combinations of
* colour-connected particles. There are no assumptions about the type
* (i.e. quark or diquark) or number of the component particles of the
* cluster; however, most of the time clusters are formed by quark-antiquark
* pairs. In special situations, such as baryon-violating processes in
* R-nonconserved Susy, three quarks (or three antiquarks) could form a
* cluster. Because at the moment we don't know how to handle 3-component
* clusters (i.e. how to fission heavy ones, or how to decay clusters), we
* provide also a separate method, reduceToTwoComponents, which
* does the job of redefining these 3-component clusters as "normal"
* 2-component ones, simply by randomly considering two (anti-) quarks as a
* (anti-) diquark. Notice that if in the future the method
* reduceToTwoComponents is modified or even eliminated, the
* main method for finding clusters, formClusters, will not need
* any change.
*
* @see \ref ClusterFinderInterfaces "The interfaces"
* defined for ClusterFinder.
*/
class ClusterFinder: public Interfaced {
public:
/**
* This routine forms the clusters of the event.
*
* Form clusters starting from the list of partons given.
* It also checks if the cluster is a beam cluster, that is if
* at least one of its components is a beam remnant.
*/
ClusterVector formClusters(const PVector & partons)
;
/**
* Reduces three component clusters into two components.
*
* For the eventual clusters that have three components
* (quark, quark, quark) or (antiquark, antiquark, antiquark),
* it redefines them as "normal" clusters with two components:
* (quark,diquark) or (antiquark,antidiquark), by a random drawing.
* This could be eliminated or changed in the future.
*/
void reduceToTwoComponents(ClusterVector&)
;
public:
/**
* 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.
*/
ClusterFinder & operator=(const ClusterFinder &);
};
}
#endif /* HERWIG_ClusterFinder_H */

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