Amplitude.h

// -*- C++ -*-
//
// Amplitude.h is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 1999-2007 Leif Lonnblad
//
// ThePEG is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef ThePEG_Amplitude_H
#define ThePEG_Amplitude_H
// This is the declaration of the Amplitude class.


#include "ThePEG/Handlers/HandlerBase.h"
#include "ThePEG/PDT/ParticleData.h"
#include "ThePEG/EventRecord/Particle.h"

namespace ThePEG {

class Amplitude: public HandlerBase {

  virtual Complex value(const tcPDVector & particles,
                        const vector<Lorentz5Momentum> & momenta, 
                        const vector<int> & helicities) = 0;

  virtual Complex overestimateValue(const tcPDVector & particles,
                                    const vector<Lorentz5Momentum> & momenta, 
                                    const vector<int> & helicities);

  Complex value(const PVector & particles, const vector<int> & helicities);

  Complex overestimateValue(const PVector & particles,
                            const vector<int> & helicities);

public:

  static void Init();

  static AbstractNoPIOClassDescription<Amplitude> initAmplitude;

  Amplitude & operator=(const Amplitude &);

};

}


namespace ThePEG {

template <>
struct BaseClassTrait<Amplitude,1>: public ClassTraitsType {
  typedef HandlerBase NthBase;
};

template <>
struct ClassTraits<Amplitude>: public ClassTraitsBase<Amplitude> {
  static string className() { return "ThePEG::Amplitude"; }
};

}

#endif /* ThePEG_Amplitude_H */

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