ME2to2Base.h

// -*- C++ -*-
//
// ME2to2Base.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_ME2to2Base_H
#define ThePEG_ME2to2Base_H
// This is the declaration of the ME2to2Base class.

#include "ThePEG/MatrixElement/MEBase.h"
#include "ThePEG/MatrixElement/Tree2toNDiagram.h"
#include "ThePEG/Interface/Switch.fh"

namespace ThePEG {

class ME2to2Base: public MEBase {

public:

  ME2to2Base()
    : theScaleChoice(0), theLastTHat(ZERO), theLastUHat(ZERO),
      theLastPhi(0.0) {}

  virtual ~ME2to2Base();

public:

  virtual int nDim() const { return 1; }

  virtual bool generateKinematics(const double * r);

  virtual CrossSection dSigHatDR() const;

  virtual Energy2 scale() const;

  virtual void setKinematics();

  virtual double getCosTheta(double cthmin, double cthmax, const double * r);

  int scaleChoice() const { return theScaleChoice; }

public:

  Energy2 tHat() const { return theLastTHat; }

  Energy2 uHat() const { return theLastUHat; }

  double phi() const { return theLastPhi; }

public:

  void persistentOutput(PersistentOStream & os) const;

  void persistentInput(PersistentIStream & is, int version);

  static void Init();

protected:

  void tHat(Energy2 e2) { theLastTHat = e2; }

  void uHat(Energy2 e2) { theLastUHat = e2; }

  void phi(double phi) { theLastPhi = phi; }

protected:

  static Switch<ME2to2Base,int> & interfaceScaleChoice();

private:

  int theScaleChoice;

  Energy2 theLastTHat;

  Energy2 theLastUHat;

  double theLastPhi;


private:

  static AbstractClassDescription<ME2to2Base> initME2to2Base;

  ME2to2Base & operator=(const ME2to2Base &);

};

}


namespace ThePEG {

template <>
struct BaseClassTrait<ME2to2Base,1>: public ClassTraitsType {
  typedef MEBase NthBase;
};

template <>
struct ClassTraits<ME2to2Base>: public ClassTraitsBase<ME2to2Base> {
  static string className() { return "ThePEG::ME2to2Base"; }
};

}

#endif /* ThePEG_ME2to2Base_H */

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