#include <TracksClusteringFromDisplacedSeed.h>

Classes
struct	Cluster

Public Member Functions
std::vector< Cluster >	clusters (const reco::Vertex &pv, const std::vector< reco::TransientTrack > &selectedTracks)

	TracksClusteringFromDisplacedSeed (const edm::ParameterSet &params)

Private Member Functions
std::pair< std::vector< reco::TransientTrack >, GlobalPoint >	nearTracks (const reco::TransientTrack &seed, const std::vector< reco::TransientTrack > &tracks, const reco::Vertex &primaryVertex) const

bool	trackFilter (const reco::TrackRef &track) const

Private Attributes
double	clusterMaxDistance

double	clusterMaxSignificance

double	clusterMinAngleCosine

double	distanceRatio

double	max3DIPSignificance

double	max3DIPValue

double	maxTimeSignificance

double	min3DIPSignificance

double	min3DIPValue

Detailed Description

Definition at line 25 of file TracksClusteringFromDisplacedSeed.h.

Constructor & Destructor Documentation

TracksClusteringFromDisplacedSeed::TracksClusteringFromDisplacedSeed ( const edm::ParameterSet & params )

Definition at line 5 of file TracksClusteringFromDisplacedSeed.cc.

                                                                                                   :
 //  maxNTracks(params.getParameter<unsigned int>("maxNTracks")),
     max3DIPSignificance(params.getParameter<double>("seedMax3DIPSignificance")),
     max3DIPValue(params.getParameter<double>("seedMax3DIPValue")),
     min3DIPSignificance(params.getParameter<double>("seedMin3DIPSignificance")),
     min3DIPValue(params.getParameter<double>("seedMin3DIPValue")),
     clusterMaxDistance(params.getParameter<double>("clusterMaxDistance")),
         clusterMaxSignificance(params.getParameter<double>("clusterMaxSignificance")), //3
         distanceRatio(params.getParameter<double>("distanceRatio")),//was clusterScale/densityFactor
         clusterMinAngleCosine(params.getParameter<double>("clusterMinAngleCosine")), //0.0
     maxTimeSignificance(params.getParameter<double>("maxTimeSignificance"))
 
 {
     
 }

Member Function Documentation

std::vector< TracksClusteringFromDisplacedSeed::Cluster > TracksClusteringFromDisplacedSeed::clusters	(	const reco::Vertex &	pv,
		const std::vector< reco::TransientTrack > &	selectedTracks
	)

Definition at line 97 of file TracksClusteringFromDisplacedSeed.cc.

References IPTools::absoluteImpactParameter3D(), gather_cfg::cout, mps_fire::i, max3DIPSignificance, max3DIPValue, min3DIPSignificance, min3DIPValue, nearTracks(), vertices_cff::ntracks, alignCSCRings::s, TracksClusteringFromDisplacedSeed::Cluster::seedingTrack, TracksClusteringFromDisplacedSeed::Cluster::seedPoint, and TracksClusteringFromDisplacedSeed::Cluster::tracks.

 {
     using namespace reco;
     std::vector<TransientTrack> seeds;
     for(std::vector<TransientTrack>::const_iterator it = selectedTracks.begin(); it != selectedTracks.end(); it++){
                 std::pair<bool,Measurement1D> ip = IPTools::absoluteImpactParameter3D(*it,pv);
                 if(ip.first && ip.second.value() >= min3DIPValue && ip.second.significance() >= min3DIPSignificance && ip.second.value() <= max3DIPValue && ip.second.significance() <= max3DIPSignificance)
                   { 
 #ifdef VTXDEBUG
                     std::cout << "new seed " <<  it-selectedTracks.begin() << " ref " << it->trackBaseRef().key()  << " " << ip.second.value() << " " << ip.second.significance() << " " << it->track().hitPattern().trackerLayersWithMeasurement() << " " << it->track().pt() << " " << it->track().eta() << std::endl;
 #endif
                     seeds.push_back(*it);  
                   }
  
     }
 
         std::vector< Cluster > clusters;
         int i = 0;
     for(std::vector<TransientTrack>::const_iterator s = seeds.begin();
         s != seeds.end(); ++s, ++i)
         {
 #ifdef VTXDEBUG
         std::cout << "Seed N. "<<i <<   std::endl;
 #endif // VTXDEBUG
             std::pair<std::vector<reco::TransientTrack>,GlobalPoint>  ntracks = nearTracks(*s,selectedTracks,pv);
 //          std::cout << ntracks.first.size() << " " << ntracks.first.size()  << std::endl;
 //                if(ntracks.first.size() == 0 || ntracks.first.size() > maxNTracks ) continue;
                 ntracks.first.push_back(*s);
             Cluster aCl;
                 aCl.seedingTrack = *s;      
                 aCl.seedPoint = ntracks.second; 
             aCl.tracks = ntracks.first; 
                 clusters.push_back(aCl); 
        }
         
 return clusters;
 }

std::pair< std::vector< reco::TransientTrack >, GlobalPoint > TracksClusteringFromDisplacedSeed::nearTracks	(	const reco::TransientTrack &	seed,
		const std::vector< reco::TransientTrack > &	tracks,
		const reco::Vertex &	primaryVertex
	)		const

private

Definition at line 21 of file TracksClusteringFromDisplacedSeed.cc.

References funct::abs(), IPTools::absoluteImpactParameter3D(), TwoTrackMinimumDistance::calculate(), TrajectoryStateOnSurface::cartesianError(), clusterMaxDistance, clusterMaxSignificance, clusterMinAngleCosine, gather_cfg::cout, reco::Vertex::covariance(), SimDataFormats::CaloAnalysis::cp, TwoTrackMinimumDistance::crossingPoint(), SoftLeptonByDistance_cfi::distance, VertexDistance3D::distance(), TwoTrackMinimumDistance::distance(), distanceRatio, reco::TransientTrack::dtErrorExt(), TrajectoryStateOnSurface::globalDirection(), reco::TransientTrack::impactPointState(), edm::isFinite(), funct::m, mag(), maxTimeSignificance, TwoTrackMinimumDistance::points(), CartesianTrajectoryError::position(), reco::Vertex::position(), funct::pow(), MetAnalyzer::pv(), mps_fire::result, Measurement1D::significance(), mathSSE::sqrt(), reco::TransientTrack::timeExt(), groupFilesInBlocks::tt, csvLumiCalc::unit, Vector3DBase< T, FrameTag >::unit(), w, PV3DBase< T, PVType, FrameType >::x(), PV3DBase< T, PVType, FrameType >::y(), CaloParticle::y(), and PV3DBase< T, PVType, FrameType >::z().

Referenced by clusters().

 {
       VertexDistance3D distanceComputer;
       GlobalPoint pv(primaryVertex.position().x(),primaryVertex.position().y(),primaryVertex.position().z());
       std::vector<reco::TransientTrack> result;
       TwoTrackMinimumDistance dist;
       GlobalPoint seedingPoint;
       float sumWeights=0;
       std::pair<bool,Measurement1D> ipSeed = IPTools::absoluteImpactParameter3D(seed,primaryVertex);
       float pvDistance = ipSeed.second.value();
       for(std::vector<reco::TransientTrack>::const_iterator tt = tracks.begin();tt!=tracks.end(); ++tt )   {
 
        if(*tt==seed) continue;
 
        if(dist.calculate(tt->impactPointState(),seed.impactPointState()))
             {
          GlobalPoint ttPoint          = dist.points().first;
          GlobalError ttPointErr       = tt->impactPointState().cartesianError().position();
              GlobalPoint seedPosition     = dist.points().second;
              GlobalError seedPositionErr  = seed.impactPointState().cartesianError().position();
                  Measurement1D m = distanceComputer.distance(VertexState(seedPosition,seedPositionErr), VertexState(ttPoint, ttPointErr));
                  GlobalPoint cp(dist.crossingPoint()); 
 
          double timeSig = 0.;
          if( primaryVertex.covariance(3,3) > 0. && 
              edm::isFinite(seed.timeExt()) && edm::isFinite(tt->timeExt()) ) { 
            // apply only if time available and being used in vertexing
            const double tError = std::sqrt( std::pow(seed.dtErrorExt(),2) + std::pow(tt->dtErrorExt(),2) );
            timeSig = std::abs( seed.timeExt() - tt->timeExt() ) / tError;
          }
 
                  float distanceFromPV =  (dist.points().second-pv).mag();
                  float distance = dist.distance();
          GlobalVector trackDir2D(tt->impactPointState().globalDirection().x(),tt->impactPointState().globalDirection().y(),0.); 
          GlobalVector seedDir2D(seed.impactPointState().globalDirection().x(),seed.impactPointState().globalDirection().y(),0.); 
          //SK:UNUSED//    float dotprodTrackSeed2D = trackDir2D.unit().dot(seedDir2D.unit());
 
                  float dotprodTrack = (dist.points().first-pv).unit().dot(tt->impactPointState().globalDirection().unit());
                  float dotprodSeed = (dist.points().second-pv).unit().dot(seed.impactPointState().globalDirection().unit());
 
                  float w = distanceFromPV*distanceFromPV/(pvDistance*distance);
              bool selected = (m.significance() < clusterMaxSignificance && 
                   ((clusterMinAngleCosine > 0) ? (dotprodSeed > clusterMinAngleCosine) : (dotprodSeed < clusterMinAngleCosine)) && //Angles between PV-PCAonSeed vectors and seed directions
                   ((clusterMinAngleCosine > 0) ? (dotprodTrack > clusterMinAngleCosine) : (dotprodTrack < clusterMinAngleCosine)) && //Angles between PV-PCAonTrack vectors and track directions
                   //dotprodTrackSeed2D > clusterMinAngleCosine && //Angle between track and seed
                   //distance*clusterScale*tracks.size() < (distanceFromPV+pvDistance)*(distanceFromPV+pvDistance)/pvDistance && // cut scaling with track density
                   distance*distanceRatio < distanceFromPV && // cut scaling with track density
                   distance < clusterMaxDistance &&
                   timeSig < maxTimeSignificance);  // absolute distance cut
 
 #ifdef VTXDEBUG
                     std::cout << tt->trackBaseRef().key() << " :  " << (selected?"+":" ")<< " " << m.significance() << " < " << clusterMaxSignificance <<  " &&  " << 
                     dotprodSeed  << " > " <<  clusterMinAngleCosine << "  && " << 
                     dotprodTrack  << " > " <<  clusterMinAngleCosine << "  && " << 
                     dotprodTrackSeed2D  << " > " <<  clusterMinAngleCosine << "  &&  "  << 
                     distance*distanceRatio  << " < " <<  distanceFromPV << "  crossingtoPV: " << distanceFromPV << " dis*scal " <<  distance*distanceRatio << "  <  " << distanceFromPV << " dist: " << distance << " < " << clusterMaxDistance << 
                   << "timeSig: " << timeSig << std::endl; // cut scaling with track density
 #endif           
                  if(selected)
                  {
                      result.push_back(*tt);
                      seedingPoint = GlobalPoint(cp.x()*w+seedingPoint.x(),cp.y()*w+seedingPoint.y(),cp.z()*w+seedingPoint.z());  
                      sumWeights+=w; 
                  }
             }
        }
 
    seedingPoint = GlobalPoint(seedingPoint.x()/sumWeights,seedingPoint.y()/sumWeights,seedingPoint.z()/sumWeights);
    return std::pair<std::vector<reco::TransientTrack>,GlobalPoint>(result,seedingPoint);
 
 }