TrackAssociatorByChi2 Class Reference

#include <TrackAssociatorByChi2.h>

Inheritance diagram for TrackAssociatorByChi2:

Public Types
typedef std::map< double, SimTrack >	Chi2SimMap
typedef std::pair< reco::Track, Chi2SimMap >	RecoToSimPair
typedef std::vector < RecoToSimPair >	RecoToSimPairAssociation

Public Member Functions
double	associateRecoToSim (reco::TrackCollection::const_iterator, TrackingParticleCollection::const_iterator, const reco::BeamSpot &) const
	compare reco::TrackCollection and TrackingParticleCollection iterators: returns the chi2 More...
reco::RecoToSimCollection	associateRecoToSim (const edm::RefToBaseVector< reco::Track > &, const edm::RefVector< TrackingParticleCollection > &, const edm::Event *event=0, const edm::EventSetup *setup=0) const
	Association Reco To Sim with Collections. More...
reco::RecoToSimCollection	associateRecoToSim (edm::Handle< edm::View< reco::Track > > &tCH, edm::Handle< TrackingParticleCollection > &tPCH, const edm::Event *event=0, const edm::EventSetup *setup=0) const
	compare reco to sim the handle of reco::Track and TrackingParticle collections More...
reco::SimToRecoCollection	associateSimToReco (const edm::RefToBaseVector< reco::Track > &, const edm::RefVector< TrackingParticleCollection > &, const edm::Event *event=0, const edm::EventSetup *setup=0) const
	Association Sim To Reco with Collections. More...
reco::SimToRecoCollection	associateSimToReco (edm::Handle< edm::View< reco::Track > > &tCH, edm::Handle< TrackingParticleCollection > &tPCH, const edm::Event *event=0, const edm::EventSetup *setup=0) const
	compare reco to sim the handle of reco::Track and TrackingParticle collections More...
double	compareTracksParam (reco::TrackCollection::const_iterator, edm::SimTrackContainer::const_iterator, const math::XYZTLorentzVectorD, GlobalVector, reco::TrackBase::CovarianceMatrix, const reco::BeamSpot &) const
	compare reco::TrackCollection and edm::SimTrackContainer iterators: returns the chi2 More...
RecoToSimPairAssociation	compareTracksParam (const reco::TrackCollection &, const edm::SimTrackContainer &, const edm::SimVertexContainer &, const reco::BeamSpot &) const
	compare collections reco to sim More...
std::pair< bool, reco::TrackBase::ParameterVector >	parametersAtClosestApproach (Basic3DVector< double >, Basic3DVector< double >, float, const reco::BeamSpot &) const
	propagate the track parameters of TrackinParticle from production vertex to the point of closest approach to the beam line. More...
	TrackAssociatorByChi2 (const edm::ESHandle< MagneticField > mF, edm::ParameterSet conf)
	Constructor with PSet. More...
	TrackAssociatorByChi2 (const edm::ESHandle< MagneticField > mF, double chi2Cut, bool onlyDiag, edm::InputTag beamspotSrc)
	Constructor with magnetic field, double, bool and InputTag. More...
	~TrackAssociatorByChi2 ()
	Destructor. More...
Public Member Functions inherited from TrackAssociatorBase
virtual reco::RecoToSimCollectionSeed	associateRecoToSim (const edm::Handle< edm::View< TrajectorySeed > > &, const edm::Handle< TrackingParticleCollection > &, const edm::Event *event=0, const edm::EventSetup *setup=0) const
virtual reco::RecoToSimCollectionTCandidate	associateRecoToSim (const edm::Handle< TrackCandidateCollection > &, const edm::Handle< TrackingParticleCollection > &, const edm::Event *event=0, const edm::EventSetup *setup=0) const
virtual reco::SimToRecoCollectionSeed	associateSimToReco (const edm::Handle< edm::View< TrajectorySeed > > &, const edm::Handle< TrackingParticleCollection > &, const edm::Event *event=0, const edm::EventSetup *setup=0) const
virtual reco::SimToRecoCollectionTCandidate	associateSimToReco (const edm::Handle< TrackCandidateCollection > &, const edm::Handle< TrackingParticleCollection > &, const edm::Event *event=0, const edm::EventSetup *setup=0) const
	TrackAssociatorBase ()
	Constructor. More...
virtual	~TrackAssociatorBase ()
	Destructor. More...

Private Attributes
edm::InputTag	bsSrc
double	chi2cut
bool	onlyDiagonal
edm::ESHandle< MagneticField >	theMF

Detailed Description

Class that performs the association of reco::Tracks and TrackingParticles evaluating the chi2 of reco tracks parameters and sim tracks parameters. The cut can be tuned from the config file: see data/TrackAssociatorByChi2.cfi. Note that the Association Map is filled with -ch2 and not chi2 because it is ordered using std::greater: the track with the lowest association chi2 will be the first in the output map.It is possible to use only diagonal terms (associator by pulls) seeting onlyDiagonal = true in the PSet

Date:

2010/05/18 15:40:39

Revision:

1.27

Author

cerati, magni

Definition at line 30 of file TrackAssociatorByChi2.h.

Member Typedef Documentation

typedef std::map<double, SimTrack> TrackAssociatorByChi2::Chi2SimMap

Definition at line 33 of file TrackAssociatorByChi2.h.

typedef std::pair< reco::Track, Chi2SimMap> TrackAssociatorByChi2::RecoToSimPair

Definition at line 34 of file TrackAssociatorByChi2.h.

typedef std::vector< RecoToSimPair > TrackAssociatorByChi2::RecoToSimPairAssociation

Definition at line 35 of file TrackAssociatorByChi2.h.

Constructor & Destructor Documentation

TrackAssociatorByChi2::TrackAssociatorByChi2 ( const edm::ESHandle< MagneticField >  mF, edm::ParameterSet  conf  )

inline

Constructor with PSet.

Definition at line 38 of file TrackAssociatorByChi2.h.

References onlyDiagonal, and theMF.

                                                                                  :
    chi2cut(conf.getParameter<double>("chi2cut")),
    onlyDiagonal(conf.getParameter<bool>("onlyDiagonal")),
    bsSrc(conf.getParameter<edm::InputTag>("beamSpot")) {
    theMF=mF;  
    if (onlyDiagonal)
      edm::LogInfo("TrackAssociator") << " ---- Using Off Diagonal Covariance Terms = 0 ---- " <<  "\n";
    else 
      edm::LogInfo("TrackAssociator") << " ---- Using Off Diagonal Covariance Terms != 0 ---- " <<  "\n";
  }

TrackAssociatorByChi2::TrackAssociatorByChi2 ( const edm::ESHandle< MagneticField >  mF, double  chi2Cut, bool  onlyDiag, edm::InputTag  beamspotSrc  )

inline

Constructor with magnetic field, double, bool and InputTag.

Definition at line 50 of file TrackAssociatorByChi2.h.

References bsSrc, chi2cut, onlyDiagonal, and theMF.

                                                                                                                    {
    chi2cut=chi2Cut;
    onlyDiagonal=onlyDiag;
    theMF=mF;  
    bsSrc = beamspotSrc;
  }

TrackAssociatorByChi2::~TrackAssociatorByChi2 ( )

inline

Destructor.

Definition at line 58 of file TrackAssociatorByChi2.h.

{}

Member Function Documentation

double TrackAssociatorByChi2::associateRecoToSim	(	reco::TrackCollection::const_iterator	,
		TrackingParticleCollection::const_iterator	,
		const reco::BeamSpot &
	)		const

compare reco::TrackCollection and TrackingParticleCollection iterators: returns the chi2

Referenced by KVFTest::analyze().

RecoToSimCollection TrackAssociatorByChi2::associateRecoToSim ( const edm::RefToBaseVector< reco::Track > &  tC, const edm::RefVector< TrackingParticleCollection > &  tPCH, const edm::Event *  event = 0, const edm::EventSetup *  setup = 0  ) const

virtual

Association Reco To Sim with Collections.

Implements TrackAssociatorBase.

Definition at line 164 of file TrackAssociatorByChi2.cc.

References edm::RefToBaseVector< T >::begin(), reco::deltaPhi(), edm::RefToBaseVector< T >::end(), f, edm::Event::getByLabel(), i, edm::AssociationMap< Tag >::insert(), j, LogDebug, LogTrace, reco::BeamSpot::position(), edm::AssociationMap< Tag >::post_insert(), edm::RefVector< C, T, F >::product(), and edm::RefVector< C, T, F >::size().

                                                                                                {
  edm::Handle<reco::BeamSpot> recoBeamSpotHandle;
  e->getByLabel(bsSrc,recoBeamSpotHandle);
  reco::BeamSpot bs = *recoBeamSpotHandle;      

  RecoToSimCollection  outputCollection;
  double chi2;

  TrackingParticleCollection tPC;
  if (tPCH.size()!=0)  tPC = *tPCH.product();

  int tindex=0;
  for (RefToBaseVector<reco::Track>::const_iterator rt=tC.begin(); rt!=tC.end(); rt++, tindex++){

    LogDebug("TrackAssociator") << "=========LOOKING FOR ASSOCIATION===========" << "\n"
                << "rec::Track #"<<tindex<<" with pt=" << (*rt)->pt() <<  "\n"
                << "===========================================" << "\n";
 
    TrackBase::ParameterVector rParameters = (*rt)->parameters();

    TrackBase::CovarianceMatrix recoTrackCovMatrix = (*rt)->covariance();
    if (onlyDiagonal){
      for (unsigned int i=0;i<5;i++){
    for (unsigned int j=0;j<5;j++){
      if (i!=j) recoTrackCovMatrix(i,j)=0;
    }
      }
    } 

    recoTrackCovMatrix.Invert();

    int tpindex =0;
    for (TrackingParticleCollection::const_iterator tp=tPC.begin(); tp!=tPC.end(); tp++, ++tpindex){
    
      //skip tps with a very small pt
      //if (sqrt(tp->momentum().perp2())<0.5) continue;
      Basic3DVector<double> momAtVtx(tp->momentum().x(),tp->momentum().y(),tp->momentum().z());
      Basic3DVector<double> vert=(Basic3DVector<double>) tp->vertex();

      std::pair<bool,reco::TrackBase::ParameterVector> params = parametersAtClosestApproach(vert, momAtVtx, tp->charge(), bs);
      if (params.first){
    TrackBase::ParameterVector sParameters=params.second;
    
    TrackBase::ParameterVector diffParameters = rParameters - sParameters;
        diffParameters[2] = reco::deltaPhi(diffParameters[2],0.f);
    
    chi2 = ROOT::Math::Similarity(diffParameters, recoTrackCovMatrix);
    chi2 /= 5;
    
    LogTrace("TrackAssociator") << "====TP index=" << tpindex << "  RECO TRACK index="<<tindex<<" WITH PT=" << (*rt)->pt() << "====\n" 
                    << "qoverp sim: " << sParameters[0] << "\n" 
                    << "lambda sim: " << sParameters[1] << "\n" 
                    << "phi    sim: " << sParameters[2] << "\n" 
                    << "dxy    sim: " << sParameters[3] << "\n" 
                    << "dsz    sim: " << sParameters[4] << "\n" 
                    << ": " /*<< */ << "\n" 
                    << "qoverp rec: " << (*rt)->qoverp() << " err: " << (*rt)->error(0) << "\n"
                    << "lambda rec: " << (*rt)->lambda() << " err: " << (*rt)->error(1) << "\n"
                    << "phi    rec: " << (*rt)->phi() << " err: " << (*rt)->error(2) << "\n"
                    << "dxy    rec: " << (*rt)->dxy(bs.position()) << " err: " << (*rt)->error(3) << "\n"
                    << "dsz    rec: " << (*rt)->dsz(bs.position()) << " err: " << (*rt)->error(4) << "\n"
                    << ": " /*<< */ << "\n" 
                    << "chi2: " << chi2 << "\n";
    
    if (chi2<chi2cut) {
      outputCollection.insert(tC[tindex], 
                  std::make_pair(edm::Ref<TrackingParticleCollection>(tPCH, tpindex),
                         -chi2));//-chi2 because the Association Map is ordered using std::greater
    }
      }
    }
  }
  outputCollection.post_insert();
  return outputCollection;
}

reco::RecoToSimCollection TrackAssociatorByChi2::associateRecoToSim ( edm::Handle< edm::View< reco::Track > > &  tCH, edm::Handle< TrackingParticleCollection > &  tPCH, const edm::Event *  event = 0, const edm::EventSetup *  setup = 0  ) const

inlinevirtual

compare reco to sim the handle of reco::Track and TrackingParticle collections

Reimplemented from TrackAssociatorBase.

Definition at line 96 of file TrackAssociatorByChi2.h.

References TrackAssociatorBase::associateRecoToSim(), event(), and HcalObjRepresent::setup().

                                                                                      {
    return TrackAssociatorBase::associateRecoToSim(tCH,tPCH,event,setup);
  }

SimToRecoCollection TrackAssociatorByChi2::associateSimToReco ( const edm::RefToBaseVector< reco::Track > &  tC, const edm::RefVector< TrackingParticleCollection > &  tPCH, const edm::Event *  event = 0, const edm::EventSetup *  setup = 0  ) const

virtual

Association Sim To Reco with Collections.

Implements TrackAssociatorBase.

Definition at line 245 of file TrackAssociatorByChi2.cc.

References edm::RefToBaseVector< T >::begin(), reco::deltaPhi(), edm::RefToBaseVector< T >::end(), f, edm::Event::getByLabel(), i, edm::AssociationMap< Tag >::insert(), j, LogDebug, LogTrace, reco::BeamSpot::position(), edm::AssociationMap< Tag >::post_insert(), edm::RefVector< C, T, F >::product(), edm::RefVector< C, T, F >::size(), and mathSSE::sqrt().

                                                                                                 {
  edm::Handle<reco::BeamSpot> recoBeamSpotHandle;
  e->getByLabel(bsSrc,recoBeamSpotHandle);
  reco::BeamSpot bs = *recoBeamSpotHandle;      

  SimToRecoCollection  outputCollection;
  double chi2;

  TrackingParticleCollection tPC;
  if (tPCH.size()!=0)  tPC = *tPCH.product();

  int tpindex =0;
  for (TrackingParticleCollection::const_iterator tp=tPC.begin(); tp!=tPC.end(); tp++, ++tpindex){
    
    //skip tps with a very small pt
    //if (sqrt(tp->momentum().perp2())<0.5) continue;
    
    LogDebug("TrackAssociator") << "=========LOOKING FOR ASSOCIATION===========" << "\n"
                << "TrackingParticle #"<<tpindex<<" with pt=" << sqrt(tp->momentum().perp2()) << "\n"
                << "===========================================" << "\n";
    
    Basic3DVector<double> momAtVtx(tp->momentum().x(),tp->momentum().y(),tp->momentum().z());
    Basic3DVector<double> vert(tp->vertex().x(),tp->vertex().y(),tp->vertex().z());
    
    std::pair<bool,reco::TrackBase::ParameterVector> params = parametersAtClosestApproach(vert, momAtVtx, tp->charge(), bs);
    if (params.first){
      TrackBase::ParameterVector sParameters=params.second;
      
      int tindex=0;
      for (RefToBaseVector<reco::Track>::const_iterator rt=tC.begin(); rt!=tC.end(); rt++, tindex++){
    
    TrackBase::ParameterVector rParameters = (*rt)->parameters();

    TrackBase::CovarianceMatrix recoTrackCovMatrix = (*rt)->covariance();
    if (onlyDiagonal) {
      for (unsigned int i=0;i<5;i++){
        for (unsigned int j=0;j<5;j++){
          if (i!=j) recoTrackCovMatrix(i,j)=0;
        }
      }
    }
    
    recoTrackCovMatrix.Invert();
    
    TrackBase::ParameterVector diffParameters = rParameters - sParameters;
        diffParameters[2] = reco::deltaPhi(diffParameters[2],0.f);
    
    chi2 = ROOT::Math::Similarity(recoTrackCovMatrix, diffParameters);
    chi2 /= 5;
    
    LogTrace("TrackAssociator") << "====TP index=" << tpindex << "  RECO TRACK index="<<tindex<<" WITH PT=" << (*rt)->pt() << "====\n" 
                    << "qoverp sim: " << sParameters[0] << "\n" 
                    << "lambda sim: " << sParameters[1] << "\n" 
                    << "phi    sim: " << sParameters[2] << "\n" 
                    << "dxy    sim: " << sParameters[3] << "\n" 
                    << "dsz    sim: " << sParameters[4] << "\n" 
                    << ": " /*<< */ << "\n" 
                    << "qoverp rec: " << (*rt)->qoverp() << " err: " << (*rt)->error(0) << "\n"
                    << "lambda rec: " << (*rt)->lambda() << " err: " << (*rt)->error(1) << "\n"
                    << "phi    rec: " << (*rt)->phi() << " err: " << (*rt)->error(2) << "\n"
                    << "dxy    rec: " << (*rt)->dxy(bs.position()) << " err: " << (*rt)->error(3) << "\n"
                    << "dsz    rec: " << (*rt)->dsz(bs.position()) << " err: " << (*rt)->error(4) << "\n"
                    << ": " /*<< */ << "\n" 
                    << "chi2: " << chi2 << "\n";
    
    if (chi2<chi2cut) {
      outputCollection.insert(edm::Ref<TrackingParticleCollection>(tPCH, tpindex),
                  std::make_pair(tC[tindex],
                         -chi2));//-chi2 because the Association Map is ordered using std::greater
    }
      }
    }
  }
  outputCollection.post_insert();
  return outputCollection;
}

reco::SimToRecoCollection TrackAssociatorByChi2::associateSimToReco ( edm::Handle< edm::View< reco::Track > > &  tCH, edm::Handle< TrackingParticleCollection > &  tPCH, const edm::Event *  event = 0, const edm::EventSetup *  setup = 0  ) const

inlinevirtual

compare reco to sim the handle of reco::Track and TrackingParticle collections

Reimplemented from TrackAssociatorBase.

Definition at line 104 of file TrackAssociatorByChi2.h.

References TrackAssociatorBase::associateSimToReco(), event(), and HcalObjRepresent::setup().

                                                                                      {
    return TrackAssociatorBase::associateSimToReco(tCH,tPCH,event,setup);
  }  

double TrackAssociatorByChi2::compareTracksParam	(	reco::TrackCollection::const_iterator	,
		edm::SimTrackContainer::const_iterator	,
		const math::XYZTLorentzVectorD	,
		GlobalVector	,
		reco::TrackBase::CovarianceMatrix	,
		const reco::BeamSpot &
	)		const

compare reco::TrackCollection and edm::SimTrackContainer iterators: returns the chi2

TrackAssociatorByChi2::RecoToSimPairAssociation TrackAssociatorByChi2::compareTracksParam	(	const reco::TrackCollection &	rtColl,
		const edm::SimTrackContainer &	stColl,
		const edm::SimVertexContainer &	svColl,
		const reco::BeamSpot &	bs
	)		const

compare collections reco to sim

Definition at line 40 of file TrackAssociatorByChi2.cc.

References reco::deltaPhi(), f, i, and j.

                                                   {
  
  RecoToSimPairAssociation outputVec;

  for (TrackCollection::const_iterator track=rtColl.begin(); track!=rtColl.end(); track++){
     Chi2SimMap outMap;

    TrackBase::ParameterVector rParameters = track->parameters();

    TrackBase::CovarianceMatrix recoTrackCovMatrix = track->covariance();
    if (onlyDiagonal){
      for (unsigned int i=0;i<5;i++){
    for (unsigned int j=0;j<5;j++){
      if (i!=j) recoTrackCovMatrix(i,j)=0;
    }
      }
    }
    recoTrackCovMatrix.Invert();

    for (SimTrackContainer::const_iterator st=stColl.begin(); st!=stColl.end(); st++){

      Basic3DVector<double> momAtVtx(st->momentum().x(),st->momentum().y(),st->momentum().z());
      Basic3DVector<double> vert = (Basic3DVector<double>)  svColl[st->vertIndex()].position();

      std::pair<bool,reco::TrackBase::ParameterVector> params = parametersAtClosestApproach(vert, momAtVtx, st->charge(), bs);
      if (params.first){
    TrackBase::ParameterVector sParameters = params.second;
      
    TrackBase::ParameterVector diffParameters = rParameters - sParameters;
        diffParameters[2] = reco::deltaPhi(diffParameters[2],0.f);
    double chi2 = ROOT::Math::Dot(diffParameters * recoTrackCovMatrix, diffParameters);
    chi2/=5;
    if (chi2<chi2cut) outMap[chi2]=*st;
      }
    }
    outputVec.push_back(RecoToSimPair(*track,outMap));
  }
  return outputVec;
}

pair< bool, TrackBase::ParameterVector > TrackAssociatorByChi2::parametersAtClosestApproach	(	Basic3DVector< double >	vertex,
		Basic3DVector< double >	momAtVtx,
		float	charge,
		const reco::BeamSpot &	bs
	)		const

propagate the track parameters of TrackinParticle from production vertex to the point of closest approach to the beam line.

Definition at line 136 of file TrackAssociatorByChi2.cc.

References FreeTrajectoryState::charge(), funct::cos(), Geom::halfPi(), PV3DBase< T, PVType, FrameType >::mag(), FreeTrajectoryState::momentum(), AlCaHLTBitMon_ParallelJobs::p, PV3DBase< T, PVType, FrameType >::perp(), PV3DBase< T, PVType, FrameType >::phi(), FreeTrajectoryState::position(), funct::sin(), PV3DBase< T, PVType, FrameType >::theta(), TrajectoryStateClosestToBeamLine::trackStateAtPCA(), v, PV3DBase< T, PVType, FrameType >::x(), Basic3DVector< T >::x(), PV3DBase< T, PVType, FrameType >::y(), Basic3DVector< T >::y(), PV3DBase< T, PVType, FrameType >::z(), and Basic3DVector< T >::z().

Referenced by VertexFitterResult::fill().

                                                    {
  
  TrackBase::ParameterVector sParameters;
  try {
    FreeTrajectoryState ftsAtProduction(GlobalPoint(vertex.x(),vertex.y(),vertex.z()),
                    GlobalVector(momAtVtx.x(),momAtVtx.y(),momAtVtx.z()),
                    TrackCharge(charge),
                    theMF.product());
    TSCBLBuilderNoMaterial tscblBuilder;
    TrajectoryStateClosestToBeamLine tsAtClosestApproach = tscblBuilder(ftsAtProduction,bs);//as in TrackProducerAlgorithm
    
    GlobalPoint v = tsAtClosestApproach.trackStateAtPCA().position();
    GlobalVector p = tsAtClosestApproach.trackStateAtPCA().momentum();
    sParameters[0] = tsAtClosestApproach.trackStateAtPCA().charge()/p.mag();
    sParameters[1] = Geom::halfPi() - p.theta();
    sParameters[2] = p.phi();
    sParameters[3] = (-v.x()*sin(p.phi())+v.y()*cos(p.phi()));
    sParameters[4] = v.z()*p.perp()/p.mag() - (v.x()*p.x()+v.y()*p.y())/p.perp() * p.z()/p.mag();
    
    return pair<bool,TrackBase::ParameterVector>(true,sParameters);
  } catch ( ... ) {
    return pair<bool,TrackBase::ParameterVector>(false,sParameters);
  }
}

Member Data Documentation

edm::InputTag TrackAssociatorByChi2::bsSrc

private

Definition at line 114 of file TrackAssociatorByChi2.h.

Referenced by TrackAssociatorByChi2().

double TrackAssociatorByChi2::chi2cut

private

Definition at line 112 of file TrackAssociatorByChi2.h.

Referenced by TrackAssociatorByChi2().

bool TrackAssociatorByChi2::onlyDiagonal

private

Definition at line 113 of file TrackAssociatorByChi2.h.

Referenced by TrackAssociatorByChi2().

edm::ESHandle<MagneticField> TrackAssociatorByChi2::theMF

private

Definition at line 111 of file TrackAssociatorByChi2.h.

Referenced by TrackAssociatorByChi2().