/data/doxygen/doxygen-1.7.3/gen/CMSSW_4_2_8/src/DataFormats/BTauReco/src/IsolatedTauTagInfo.cc

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#include "DataFormats/BTauReco/interface/IsolatedTauTagInfo.h"
#include "DataFormats/TrackReco/interface/Track.h" 
#include "DataFormats/TrackReco/interface/TrackFwd.h" 
#include <Math/GenVector/VectorUtil.h>

using namespace edm;
using namespace reco;

const RefVector<TrackCollection> IsolatedTauTagInfo::tracksInCone( const math::XYZVector myVector, const float size,  const float pt_min) const { 
  
  RefVector<TrackCollection> tmp;
 
  RefVector<TrackCollection>::const_iterator myTrack = selectedTracks_.begin();
  for(;myTrack != selectedTracks_.end(); myTrack++)
    {
      const math::XYZVector trackMomentum = (*myTrack)->momentum() ;
      float pt_tk = (*myTrack)->pt();
      float deltaR = ROOT::Math::VectorUtil::DeltaR(myVector, trackMomentum);
      if ( deltaR < size && pt_tk > pt_min) tmp.push_back( *myTrack);
      }

  //  sort(tmp.begin(), tmp.end(), SortByDescendingTrackPt());
  return tmp;
}

const RefVector<TrackCollection> IsolatedTauTagInfo::tracksInCone( const math::XYZVector myVector, const float size,  const float pt_min, const float z_pv, const float dz_lt) const { 
  
  RefVector<TrackCollection> tmp;
 
  RefVector<TrackCollection>::const_iterator myTrack = selectedTracks_.begin();
  for(;myTrack != selectedTracks_.end(); myTrack++)
    {
      const math::XYZVector trackMomentum = (*myTrack)->momentum() ;
      float pt_tk = (*myTrack)->pt();
      float deltaR = ROOT::Math::VectorUtil::DeltaR(myVector, trackMomentum);
      if ( deltaR < size && pt_tk > pt_min && fabs((*myTrack)->dz() - z_pv) < dz_lt) tmp.push_back( *myTrack);
      }

  //  sort(tmp.begin(), tmp.end(), SortByDescendingTrackPt());
  return tmp;
}


void IsolatedTauTagInfo::setLeadingTrack(const TrackRef leadTk) {
  leadTrack_ = leadTk ;

}

const TrackRef  IsolatedTauTagInfo::leadingSignalTrack() const {
  return leadTrack_;
}

const TrackRef IsolatedTauTagInfo::leadingSignalTrack(const float rm_cone, const float pt_min) const {

  const Jet & myjet = * jet(); 
  math::XYZVector jet3Vec   (myjet.px(),myjet.py(),myjet.pz()) ;

  const  RefVector<TrackCollection>  sTracks = tracksInCone(jet3Vec, rm_cone, pt_min);
  TrackRef leadTk;
  float pt_cut = pt_min;
  if (sTracks.size() >0) 
    {
      RefVector<TrackCollection>::const_iterator myTrack =sTracks.begin();
      for(;myTrack!=sTracks.end();myTrack++)
        {
          if((*myTrack)->pt() > pt_cut) {
            leadTk = *myTrack;
            pt_cut = (*myTrack)->pt();
          }
        }
    }
  return leadTk;
}


const TrackRef  IsolatedTauTagInfo::leadingSignalTrack(const math::XYZVector myVector, const float rm_cone, const float pt_min) const {
  const RefVector<TrackCollection> sTracks = tracksInCone(myVector, rm_cone, pt_min);
  TrackRef leadTk;
  float pt_cut = pt_min;
  if (sTracks.size() >0) 
    {
      RefVector<TrackCollection>::const_iterator myTrack =sTracks.begin();
      for(;myTrack!=sTracks.end();myTrack++)
        {
          if((*myTrack)->pt() > pt_cut) {
            leadTk = *myTrack;
            pt_cut = (*myTrack)->pt();
          }
        }
    }
  return leadTk;
}

float IsolatedTauTagInfo::discriminator(float m_cone, float sig_cone, float iso_cone, float pt_min_lt, float pt_min_tk, int nTracksIsoRing) const
{
  double myDiscriminator = 0.;
  const TrackRef leadTk = leadingSignalTrack(m_cone, pt_min_lt);

  if(!leadTk) {
    return myDiscriminator;
  }
  //if signal cone is greater then the isolation cone and the leadTk exists, the jet is isolated.
  if(sig_cone > iso_cone) return 1.;

  math::XYZVector trackMomentum = leadTk->momentum() ;
  const RefVector<TrackCollection> signalTracks = tracksInCone(trackMomentum, sig_cone, pt_min_tk);
  const RefVector<TrackCollection> isolationTracks = tracksInCone(trackMomentum, iso_cone, pt_min_tk); 
  
  if (signalTracks.size() > 0 && (int)(isolationTracks.size() - signalTracks.size()) <= nTracksIsoRing)
    myDiscriminator=1;

  return myDiscriminator;
}

float IsolatedTauTagInfo::discriminator(math::XYZVector myVector, float m_cone, float sig_cone, float iso_cone, float pt_min_lt, float pt_min_tk, int nTracksIsoRing) const
{
  double myDiscriminator = 0;
  //if signal cone is greater then the isolation cone and the leadTk exists, the jet is isolated.
  if(sig_cone > iso_cone) return 1.;

const  TrackRef leadTk = leadingSignalTrack(myVector, m_cone, pt_min_lt);
  if(!leadTk) return myDiscriminator;

  //if signal cone is greater then the isolation cone and the leadTk exists, the jet is isolated.
  if(sig_cone > iso_cone) return 1.;

  math::XYZVector trackMomentum = leadTk->momentum() ;
  const RefVector<TrackCollection> signalTracks = tracksInCone(trackMomentum, sig_cone, pt_min_tk);
  const RefVector<TrackCollection> isolationTracks = tracksInCone(trackMomentum, iso_cone, pt_min_tk); 
  
  if (signalTracks.size() > 0 && (int)(isolationTracks.size() - signalTracks.size()) <= nTracksIsoRing)
    myDiscriminator=1;

  return myDiscriminator;
}

float IsolatedTauTagInfo::discriminator(float m_cone, float sig_cone, float iso_cone, float pt_min_lt, float pt_min_tk, int nTracksIsoRing, float dz_lt) const
{
  double myDiscriminator = 0;

  const TrackRef leadTk = leadingSignalTrack(m_cone, pt_min_lt);

  if(!leadTk) {
    return myDiscriminator;
  }
  //if signal cone is greater then the isolation cone and the leadTk exists, the jet is isolated.
  if(sig_cone > iso_cone) return 1.;

  math::XYZVector trackMomentum = leadTk->momentum() ;
  float z_pv = leadTk->dz();
  const RefVector<TrackCollection> signalTracks = tracksInCone(trackMomentum, sig_cone, pt_min_tk, z_pv, dz_lt);
  const RefVector<TrackCollection> isolationTracks = tracksInCone(trackMomentum, iso_cone, pt_min_tk, z_pv, dz_lt); 
  
  if (signalTracks.size() > 0 && (int)(isolationTracks.size() - signalTracks.size()) <= nTracksIsoRing)
    myDiscriminator=1;

  return myDiscriminator;
}

float IsolatedTauTagInfo::discriminator(math::XYZVector myVector, float m_cone, float sig_cone, float iso_cone, float pt_min_lt, float pt_min_tk, int nTracksIsoRing, float dz_lt) const
{
  double myDiscriminator = 0;

const  TrackRef leadTk = leadingSignalTrack(myVector, m_cone, pt_min_lt);
  if(!leadTk) return myDiscriminator;
  //if signal cone is greater then the isolation cone and the leadTk exists, the jet is isolated.
  if(sig_cone > iso_cone) return 1.;

  math::XYZVector trackMomentum = leadTk->momentum() ;
  float z_pv = leadTk->dz();
  const RefVector<TrackCollection> signalTracks = tracksInCone(trackMomentum, sig_cone, pt_min_tk, z_pv, dz_lt);
  const RefVector<TrackCollection> isolationTracks = tracksInCone(trackMomentum, iso_cone, pt_min_tk, z_pv, dz_lt); 
  
  if (signalTracks.size() > 0 && (int)(isolationTracks.size() - signalTracks.size()) <= nTracksIsoRing)
    myDiscriminator=1;

  return myDiscriminator;
}