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FlatInvertibleLabframePhasespace.h
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// -*- C++ -*-
//
// FlatInvertiblePhasespaceLabFrame.h is a part of Herwig - A multi-purpose Monte Carlo event generator
// Copyright (C) 2002-2017 The Herwig Collaboration
//
// Herwig is licenced under version 3 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef Herwig_FlatInvertibleLabframePhasespace_H
#define Herwig_FlatInvertibleLabframePhasespace_H
//
// This is the declaration of the FlatInvertibleLabframePhasespace class.
//
#include "Herwig/MatrixElement/Matchbox/Phasespace/FlatInvertiblePhasespace.h"
namespace Herwig {
using namespace ThePEG;
/**
* \ingroup Matchbox
* \author Michael Rauch
*
* \brief FlatInvertibleLabframePhasespace implements flat, invertible phase space generation in the lab frame
*
*/
class FlatInvertibleLabframePhasespace: public FlatInvertiblePhasespace {
public:
/** @name Standard constructors and destructors. */
//@{
/**
* The default constructor.
*/
FlatInvertibleLabframePhasespace();
/**
* The destructor.
*/
virtual ~FlatInvertibleLabframePhasespace();
//@}
public:
/**
* Generate a phase space point and return its weight.
*/
virtual double generateTwoToNKinematics(const double*,
vector<Lorentz5Momentum>& momenta);
/**
* Return the number of random numbers required to produce a given
* multiplicity final state.
*/
virtual int nDimPhasespace(int nFinal) const {
if ( nFinal == 1 )
return 3;
return 3*nFinal - 2;
}
public:
/**
* Return true, if this phasespace generator will generate incoming
* partons itself.
*/
virtual bool haveX1X2() const { return true; }
/**
* Return true, if this phase space generator expects
* the incoming partons in their center-of-mass system
*/
virtual bool wantCMS() const { return false; }
/**
* Invert the given phase space point to the random numbers which
* would have generated it.
*/
virtual double invertTwoToNKinematics(const vector<Lorentz5Momentum>& momenta,
double* r) const;
private:
/**
* True if SHat should be generated flat in log(SHat/S),
* false if SHat should be generated flat in SHat.
*/
bool theLogSHat;
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);
//@}
/**
* The standard Init function used to initialize the interfaces.
* Called exactly once for each class by the class description system
* before the main function starts or
* when this class is dynamically loaded.
*/
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;
//@}
// If needed, insert declarations of virtual function defined in the
// InterfacedBase class here (using ThePEG-interfaced-decl in Emacs).
private:
/**
* The assignment operator is private and must never be called.
* In fact, it should not even be implemented.
*/
FlatInvertibleLabframePhasespace & operator=(const FlatInvertibleLabframePhasespace &) = delete;
};
}
#endif /* Herwig_FlatInvertiblePhasespace_H */

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