ME2to2Base.h

// -*- C++ -*-
//
// ME2to2Base.h is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 1999-2019 Leif Lonnblad
//
// ThePEG is licenced under version 3 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 &) = delete;
 
};
 
}
 
 
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 */