TildeKinematics.h

// -*- C++ -*-
//
// TildeKinematics.h is a part of Herwig - A multi-purpose Monte Carlo event generator
// Copyright (C) 2002-2019 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_TildeKinematics_H
#define HERWIG_TildeKinematics_H
//
// This is the declaration of the TildeKinematics class.
//
 
#include "ThePEG/Handlers/HandlerBase.h"
#include "ThePEG/Handlers/StandardXComb.h"
 
#include "Herwig/MatrixElement/Matchbox/Dipoles/SubtractionDipole.h"
 
namespace Herwig {
 
using namespace ThePEG;
 
class TildeKinematics: public HandlerBase {
 
public:
 
  Ptr<TildeKinematics>::ptr cloneMe() const {
    return dynamic_ptr_cast<Ptr<TildeKinematics>::ptr>(clone());
  }
 
  const Lorentz5Momentum& realEmitterMomentum() const {
    return theRealXComb->meMomenta()[theDipole->realEmitter()];
  }
 
  const Lorentz5Momentum& realEmissionMomentum() const {
    return theRealXComb->meMomenta()[theDipole->realEmission()];
  }
 
  const Lorentz5Momentum& realSpectatorMomentum() const {
    return theRealXComb->meMomenta()[theDipole->realSpectator()];
  }
 
  const Lorentz5Momentum& bornEmitterMomentum() const { return theBornEmitterMomentum; }
 
  const Lorentz5Momentum& bornSpectatorMomentum() const { return theBornSpectatorMomentum; }
 
  const vector<double>& subtractionParameters() const { return theDipole->subtractionParameters(); }
 
  virtual bool doesTransform() const { return false; }
 
  virtual Lorentz5Momentum transform(const Lorentz5Momentum& p) const { return p; }
 
  virtual void getShowerVariables() const {}
 
  virtual double jacobianRatio() const { return 1.; }
 
public:
 
  void prepare(tcStdXCombPtr newRealXComb,
               tcStdXCombPtr newBornXComb) {
    theRealXComb = newRealXComb; theBornXComb = newBornXComb;
  }
 
  void dipole(Ptr<SubtractionDipole>::tptr dip) { theDipole = dip; }
 
  Ptr<SubtractionDipole>::tptr dipole() { return theDipole; }
 
  Ptr<SubtractionDipole>::tcptr dipole() const { return theDipole; }
 
  virtual bool doMap() = 0;
 
  virtual Energy lastPt() const = 0;
  
  
  virtual Energy lastPt(Lorentz5Momentum,Lorentz5Momentum,Lorentz5Momentum) const =0 ;
 
 
  virtual pair<double,double> zBounds(Energy pt, Energy hardPt ) const = 0;
  
  
  virtual double lastZ() const = 0;
 
  virtual Energy lastScale() const;
  
  virtual bool aboveAlpha() const {
        cerr<<"only implemented for light kinematics";
        assert(false);
        return false;
  }
 
  cPDPtr realEmitterData() const { 
    return 
      (theDipole && theRealXComb) ? 
      theRealXComb->mePartonData()[theDipole->realEmitter()] :
      cPDPtr();
  }
 
  cPDPtr realEmissionData() const { 
    return 
      (theDipole && theRealXComb) ? 
      theRealXComb->mePartonData()[theDipole->realEmission()] :
      cPDPtr();
  }
 
  cPDPtr realSpectatorData() const { 
    return 
      (theDipole && theRealXComb) ? 
      theRealXComb->mePartonData()[theDipole->realSpectator()] :
      cPDPtr();
  }
 
  cPDPtr bornEmitterData() const { 
    return 
      (theDipole && theBornXComb) ? 
      theBornXComb->mePartonData()[theDipole->bornEmitter()] :
      cPDPtr();
  }
 
  cPDPtr bornSpectatorData() const { 
    return 
      (theDipole && theBornXComb) ? 
      theBornXComb->mePartonData()[theDipole->bornSpectator()] :
      cPDPtr();
  }
 
protected:
 
  Lorentz5Momentum& bornEmitterMomentum() { return theBornEmitterMomentum; }
 
  Lorentz5Momentum& bornSpectatorMomentum() { return theBornSpectatorMomentum; }
 
  vector<double>& subtractionParameters() { return theDipole->subtractionParameters(); }
 
public: 
  double emitterX() const {
    return
    theDipole->bornEmitter() == 0 ?
    theBornXComb->lastX1() :
    theBornXComb->lastX2();
  }
  
  
  double spectatorX() const {
    return
    theDipole->bornSpectator() == 0 ?
    theBornXComb->lastX1() :
    theBornXComb->lastX2();
  }
 
  
public:
 
  void persistentOutput(PersistentOStream & os) const;
 
  void persistentInput(PersistentIStream & is, int version);
 
  static void Init();
 
 
// If needed, insert declarations of virtual function defined in the
// InterfacedBase class here (using ThePEG-interfaced-decl in Emacs).
 
 
protected:
 
  virtual void rebind(const TranslationMap & trans);
 
  virtual IVector getReferences();
 
 
private:
 
  Ptr<SubtractionDipole>::tptr theDipole;
 
  tcStdXCombPtr theRealXComb;
 
  tcStdXCombPtr theBornXComb;
 
  Lorentz5Momentum theBornEmitterMomentum;
 
  Lorentz5Momentum theBornSpectatorMomentum;
 
private:
 
  TildeKinematics & operator=(const TildeKinematics &) = delete;
 
};
 
}
 
#endif /* HERWIG_TildeKinematics_H */