Conversion.h

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#ifndef DataFormats_PatCandidates_Conversion_h
#define DataFormats_PatCandidates_Conversion_h

#include "DataFormats/EgammaCandidates/interface/GsfElectron.h"
#include "DataFormats/EgammaCandidates/interface/GsfElectronFwd.h"
#include "DataFormats/EgammaCandidates/interface/GsfElectronCore.h"
#include "DataFormats/EgammaCandidates/interface/GsfElectronCoreFwd.h"
#include "DataFormats/GsfTrackReco/interface/GsfTrack.h"
#include "DataFormats/PatCandidates/interface/Lepton.h"

// Define typedefs for convenience
namespace pat {
  class Conversion;
  typedef std::vector<Conversion> ConversionCollection;
  typedef edm::Ref<ConversionCollection> ConversionRef;
  typedef edm::RefVector<ConversionCollection> ConversionRefVector;
}  // namespace pat

//we use index to match with electron. However, can we do this with gsfTrack instead of index?
namespace pat {
  class Conversion {
  public:
    Conversion() {}
    Conversion(int index);
    virtual ~Conversion() {}

    const double vtxProb() const { return vtxProb_; }
    void setVtxProb(double vtxProb);
    const double lxy() const { return lxy_; }
    void setLxy(double lxy);
    const int nHitsMax() const { return nHitsMax_; }
    void setNHitsMax(int nHitsMax);
    const int index() const { return index_; }

  private:
    double vtxProb_;
    double lxy_;
    int nHitsMax_;

    //electron index matched with conversion
    int index_;
  };
}  // namespace pat

#endif