DISLepton.hh

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// -*- C++ -*-
#ifndef RIVET_DISLepton_HH
#define RIVET_DISLepton_HH

#include "Rivet/Projections/Beam.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Particle.hh"
#include "Rivet/Event.hh"

namespace Rivet {


  /// This class projects out the incoming and outgoing leptons in a DIS
  /// event.
  class DISLepton : public Projection {
 
  public:
 
    /// @name Constructors.
    //@{
 
    DISLepton(){
      setName("DISLepton");
      addProjection(Beam(), "Beam");
      addProjection(FinalState(), "FS");
    }
 
    /// Clone on the heap.
    virtual const Projection* clone() const {
      return new DISLepton(*this);
    }
    //@}
 
 
  protected:
 
    /// Perform the projection operation on the supplied event.
    virtual void project(const Event& e);
 
    /// Compare with other projections.
    virtual int compare(const Projection& p) const;
 
  public:
 
    /// The incoming lepton.
    const Particle& in() const { return _incoming; }
 
    /// The outgoing lepton.
    const Particle& out() const { return _outgoing; }
 
    const double &pzSign() const { return _sign; }
 
  private:
 
    /// The incoming lepton.
    Particle _incoming;
 
    /// The outgoing lepton.
    Particle _outgoing;
     
    /// The sign of the PZ of the incoming lepton
    double _sign;
 
  };

}


#endif