DISKinematics.hh

// -*- C++ -*-
#ifndef RIVET_DISKinematics_HH
#define RIVET_DISKinematics_HH
 
#include "Rivet/Event.hh"
#include "Rivet/Particle.hh"
#include "Rivet/Projection.hh"
#include "Rivet/Projections/Beam.hh"
#include "Rivet/Projections/DISLepton.hh"
 
namespace Rivet {
 

  enum class DISFrame { HCM, XCM, BREIT, LAB };
 

  class DISKinematics : public Projection {
  public:

    DISKinematics(const DISLepton& lepton = DISLepton())
        : _theQ2(-1.0), _theW2(-1.0), _theX(-1.0), _theY(-1.0), _theS(-1.0), _theGH(-1.0) {
      setName("DISKinematics");
      //addPdgIdPair(ANY, hadid);
      declare(Beam(), "Beam");
      declare(lepton, "Lepton");
    }

    RIVET_DEFAULT_PROJ_CLONE(DISKinematics);

    using Projection::operator=;
 
 
  protected:

    virtual void project(const Event& e);

    virtual CmpState compare(const Projection& p) const;
 
 
  public:

    double Q2() const {
      return _theQ2;
    }

    double W2() const {
      return _theW2;
    }

    double x() const {
      return _theX;
    }

    double y() const {
      return _theY;
    }

    double s() const {
      return _theS;
    }

    double gammahad() const {
      return _theGH;
    }
 

    const LorentzTransform& boostHCM() const {
      return _hcm;
    }

    const LorentzTransform& boostBreit() const {
      return _breit;
    }

    const Particle& beamHadron() const {
      return _inHadron;
    }

    const Particle& beamLepton() const {
      return _inLepton;
    }

    const Particle& scatteredLepton() const {
      return _outLepton;
    }

    int orientation() const {
      return sign(_inHadron.pz());
    }
 
 
  protected:

    double _theQ2;

    double _theW2;

    double _theX;

    double _theY;

    double _theS;
    double _theGH;
 

    Particle _inHadron, _inLepton, _outLepton;

    LorentzTransform _hcm;

    LorentzTransform _breit;
  };
 
 
}
 
#endif