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TwoBodyAllOnCalculator.h
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TwoBodyAllOnCalculator.h
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// -*- C++ -*-
//
// TwoBodyAllOnCalculator.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_TwoBodyAllOnCalculator_H
#define HERWIG_TwoBodyAllOnCalculator_H
// This is the declaration of the TwoBodyAllOnCalculator class.
#include "WidthCalculatorBase.h"
#include "TwoBodyAllOnCalculator.fh"
#include "GenericWidthGenerator.h"
namespace Herwig {
using namespace ThePEG;
/** \ingroup PDT
*
* The <code>TwoBodyAllOnCalculator</code> class is a wrapped around the the
* simple two body decay matrix elements in the <code>GenericWidthGenerator</code>
* class and is designed to allow these matrix elements to be integrated
* if the external particles can be off-shell.
*
* @see TwoBodyAllOnCalculator
*
*/
class TwoBodyAllOnCalculator: public WidthCalculatorBase {
public:
/**
* The GenericWidthGenerator class is a friend to allow easier access for the
* integration of the two body partial widths.
*/
friend class GenericWidthGenerator;
public:
/**
* Constructor.
* @param inwidth Pointer to the GenericWidthGenerator class.
* @param imode The mode in the GenericWidthGenerator class we are integrating
* @param m1 The mass of the first particle.
* @param m2 The mass of the second particle.
*/
TwoBodyAllOnCalculator(tGenericWidthGeneratorPtr inwidth,int imode,
Energy m1,Energy m2)
: _mode(imode),_mass1(m1),_mass2(m2),_widthgen(inwidth)
{}
/**
* member to calculate the partial width.
* @param scale The mass squared for the decaying particle.
* @return The partial width.
*/
Energy partialWidth(Energy2 scale) const;
/**
* Get the mass of one of the decay products. This must be
* implemented in classes inheriting from this one.
* @param imass The mass required.
* @param mass The new value.
* @return The mass required.
*/
void resetMass(int imass,Energy mass) {
if(imass==1) _mass1=mass;
else if(imass==2) _mass2=mass;
else throw Exception() << "Unknown particle in "
<< "TwoBodyAllOnCalculator::resetMass()"
<< Exception::runerror;
}
/**
* Get the mass of one of the decay products. This must be
* implemented in classes inheriting from this one.
* @param imass The mass required.
* @return The mass required.
*/
Energy getMass(const int imass) const {
if(imass==1) return _mass1;
else if(imass==2) return _mass2;
else throw Exception() << "Unknown particle in "
<< "TwoBodyAllOnCalculator::getMass()"
<< Exception::runerror;
}
/**
* Get the masses of all bar the one specified. Used to get the limits
* for integration.
* @param imass The particle not needed
* @return The sum of the other masses.
*/
Energy otherMass(const int imass) const {
if(imass==1) return _mass2;
else if(imass==2) return _mass1;
else throw Exception() << "Unknown particle in "
<< "TwoBodyAllOnCalculator::otherMass()"
<< Exception::runerror;
}
private:
/**
* Private and non-existent assignment operator.
*/
TwoBodyAllOnCalculator & operator=(const TwoBodyAllOnCalculator &);
private:
/**
* the mode
*/
int _mode;
/**
* Mass of the first particle.
*/
Energy _mass1;
/**
* Mass of the second particle.
*/
Energy _mass2;
/**
* the width generator
*/
GenericWidthGeneratorPtr _widthgen;
};
}
#endif /* HERWIG_TwoBodyAllOnCalculator_H */

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