#include <EgammaHLTPixelMatchElectronAlgo.h>

Public Member Functions
	EgammaHLTPixelMatchElectronAlgo (const edm::ParameterSet &conf)

void	run (edm::Event &, reco::ElectronCollection &)

void	setupES (const edm::EventSetup &setup)

	~EgammaHLTPixelMatchElectronAlgo ()

Private Member Functions
	EgammaHLTPixelMatchElectronAlgo (const EgammaHLTPixelMatchElectronAlgo &rhs)

bool	isInnerMostWithLostHits (const reco::GsfTrackRef &, const reco::GsfTrackRef &, bool &)

EgammaHLTPixelMatchElectronAlgo &	operator= (const EgammaHLTPixelMatchElectronAlgo &rhs)

void	process (edm::Handle< reco::TrackCollection > tracksH, edm::Handle< reco::GsfTrackCollection > gsfTracksH, reco::ElectronCollection &outEle, Global3DPoint &bs)

Private Attributes
edm::InputTag	bsProducer_

unsigned long long	cacheIDMagField_

int unsigned long long	cacheIDTDGeom_

edm::InputTag	gsfTrackProducer_

edm::ESHandle< MagneticField >	magField_

MultiTrajectoryStateMode *	mtsMode_

MultiTrajectoryStateTransform *	mtsTransform_

edm::ESHandle< TrackerGeometry >	trackerGeom_

edm::InputTag	trackProducer_

bool	useGsfTracks_

Detailed Description

Class to reconstruct electron tracks from electron pixel seeds keep track of information about the initiating supercluster

Author: Monica Vazquez Acosta (CERN)

Description: top algorithm producing TrackCandidate and Electron objects from supercluster driven pixel seeded Ckf tracking for HLT

Definition at line 31 of file EgammaHLTPixelMatchElectronAlgo.h.

Constructor & Destructor Documentation

EgammaHLTPixelMatchElectronAlgo::EgammaHLTPixelMatchElectronAlgo ( const edm::ParameterSet & conf )

Definition at line 49 of file EgammaHLTPixelMatchElectronAlgo.cc.

                                                                                             :
   trackProducer_(conf.getParameter<edm::InputTag>("TrackProducer")),
   gsfTrackProducer_(conf.getParameter<edm::InputTag>("GsfTrackProducer")),
   useGsfTracks_(conf.getParameter<bool>("UseGsfTracks")),
   bsProducer_(conf.getParameter<edm::InputTag>("BSProducer")), 
   mtsMode_(new MultiTrajectoryStateMode()),
   mtsTransform_(0),
   cacheIDTDGeom_(0),
   cacheIDMagField_(0)
 {
 
 }

EgammaHLTPixelMatchElectronAlgo::~EgammaHLTPixelMatchElectronAlgo ( )

Definition at line 62 of file EgammaHLTPixelMatchElectronAlgo.cc.

References mtsMode_, and mtsTransform_.

 {
   delete mtsTransform_;
   delete mtsMode_;
  }

EgammaHLTPixelMatchElectronAlgo::EgammaHLTPixelMatchElectronAlgo ( const EgammaHLTPixelMatchElectronAlgo & rhs )

inlineprivate

Definition at line 41 of file EgammaHLTPixelMatchElectronAlgo.h.

41 {}

Member Function Documentation

bool EgammaHLTPixelMatchElectronAlgo::isInnerMostWithLostHits	(	const reco::GsfTrackRef &	nGsfTrack,
		const reco::GsfTrackRef &	iGsfTrack,
		bool &	sameLayer
	)

private

Definition at line 233 of file EgammaHLTPixelMatchElectronAlgo.cc.

Referenced by process().

                                                                                                                                                  {
   
   // define closest using the lost hits on the expectedhitsineer
   unsigned int nLostHits = nGsfTrack->trackerExpectedHitsInner().numberOfLostHits();
   unsigned int iLostHits = iGsfTrack->trackerExpectedHitsInner().numberOfLostHits();
   
   if (nLostHits!=iLostHits) {
     return (nLostHits > iLostHits);
   } else {
     sameLayer = true;
     return  false; 
   }
 }

EgammaHLTPixelMatchElectronAlgo& EgammaHLTPixelMatchElectronAlgo::operator= ( const EgammaHLTPixelMatchElectronAlgo & rhs )

inlineprivate

Definition at line 42 of file EgammaHLTPixelMatchElectronAlgo.h.

42 {return *this;}

void EgammaHLTPixelMatchElectronAlgo::process	(	edm::Handle< reco::TrackCollection >	tracksH,
		edm::Handle< reco::GsfTrackCollection >	gsfTracksH,
		reco::ElectronCollection &	outEle,
		Global3DPoint &	bs
	)

private

Definition at line 118 of file EgammaHLTPixelMatchElectronAlgo.cc.

References MultiTrajectoryStateTransform::extrapolatedState(), i, trajectoryStateTransform::innerFreeState(), MultiTrajectoryStateTransform::innerStateOnSurface(), isInnerMostWithLostHits(), TrajectoryStateOnSurface::isValid(), j, PV3DBase< T, PVType, FrameType >::mag(), magField_, MultiTrajectoryStateMode::momentumFromModeCartesian(), mtsMode_, mtsTransform_, edm::ESHandle< class >::product(), pileupReCalc_HLTpaths::scale, reco::Electron::setSuperCluster(), useGsfTracks_, PV3DBase< T, PVType, FrameType >::x(), PV3DBase< T, PVType, FrameType >::y(), and PV3DBase< T, PVType, FrameType >::z().

                                                                                                                                                                            {
 
   if (!useGsfTracks_) {
 
     for (unsigned int i=0; i<tracksH->size(); ++i) {
       
       const TrackRef trackRef = edm::Ref<TrackCollection>(tracksH, i);
       edm::RefToBase<TrajectorySeed> seed = trackRef->extra()->seedRef();
       ElectronSeedRef elseed=seed.castTo<ElectronSeedRef>();
       
       edm::RefToBase<CaloCluster> caloCluster = elseed->caloCluster() ;
       SuperClusterRef scRef = caloCluster.castTo<SuperClusterRef>() ;
       
       // Get the momentum at vertex (not at the innermost layer)
       TSCPBuilderNoMaterial tscpBuilder;
       
       FreeTrajectoryState fts = trajectoryStateTransform::innerFreeState(*trackRef, magField_.product());
       TrajectoryStateClosestToPoint tscp = tscpBuilder(fts, bs);
       
       float scale = scRef->energy()/tscp.momentum().mag();
       
       const math::XYZTLorentzVector momentum(tscp.momentum().x()*scale,
                          tscp.momentum().y()*scale,
                          tscp.momentum().z()*scale,
                          scRef->energy());
 
       Electron ele(trackRef->charge(), momentum, trackRef->vertex());
       ele.setSuperCluster(scRef);
       edm::Ref<TrackCollection> myRef(tracksH, i);
       ele.setTrack(myRef);
       outEle.push_back(ele);
     }  // loop over tracks
   } else {
 
     // clean gsf tracks
     std::vector<unsigned int> flag(gsfTracksH->size(), 0);
     if (gsfTracksH->size() == 0)
       return;
 
     for (unsigned int i=0; i<gsfTracksH->size()-1; ++i) {
       const GsfTrackRef trackRef1 = edm::Ref<GsfTrackCollection>(gsfTracksH, i);
       ElectronSeedRef elseed1 = trackRef1->extra()->seedRef().castTo<ElectronSeedRef>();
       SuperClusterRef scRef1 = elseed1->caloCluster().castTo<SuperClusterRef>();
 
       TrajectoryStateOnSurface inTSOS = mtsTransform_->innerStateOnSurface((*trackRef1));
       TrajectoryStateOnSurface fts = mtsTransform_->extrapolatedState(inTSOS, bs);
       GlobalVector innMom;
       float pin1 = trackRef1->pMode();
       if (fts.isValid()) {
     mtsMode_->momentumFromModeCartesian(fts, innMom);  
     pin1 = innMom.mag();
       }
 
       for (unsigned int j=i+1; j<gsfTracksH->size(); ++j) {
     const GsfTrackRef trackRef2 = edm::Ref<GsfTrackCollection>(gsfTracksH, j);
     ElectronSeedRef elseed2 = trackRef2->extra()->seedRef().castTo<ElectronSeedRef>();
     SuperClusterRef scRef2 = elseed2->caloCluster().castTo<SuperClusterRef>();
 
     TrajectoryStateOnSurface inTSOS = mtsTransform_->innerStateOnSurface((*trackRef2));
     TrajectoryStateOnSurface fts = mtsTransform_->extrapolatedState(inTSOS, bs);
     GlobalVector innMom;
     float pin2 = trackRef2->pMode();
     if (fts.isValid()) {
       mtsMode_->momentumFromModeCartesian(fts, innMom);  
       pin2 = innMom.mag();
     }
     
     if (scRef1 == scRef2) {
       bool isSameLayer = false;
       bool iGsfInnermostWithLostHits = isInnerMostWithLostHits(trackRef2, trackRef1, isSameLayer);
       
       if (iGsfInnermostWithLostHits) {
         flag[j] = 1;
       } else if(isSameLayer) {
         if(fabs((scRef1->energy()/pin1)-1) < fabs((scRef2->energy()/pin2)-1))
           flag[j] = 1;
       } else {
         flag[i] = 1;
       }
     }
       }
     }
 
     for (unsigned int i=0; i<gsfTracksH->size(); ++i) {
       if (flag[i] == 1)
     continue;
 
       const GsfTrackRef trackRef = edm::Ref<GsfTrackCollection>(gsfTracksH, i);
       ElectronSeedRef elseed = trackRef->extra()->seedRef().castTo<ElectronSeedRef>();
       SuperClusterRef scRef = elseed->caloCluster().castTo<SuperClusterRef>();
       
       // Get the momentum at vertex (not at the innermost layer)
       TrajectoryStateOnSurface inTSOS = mtsTransform_->innerStateOnSurface((*trackRef));
       TrajectoryStateOnSurface fts = mtsTransform_->extrapolatedState(inTSOS, bs);
       GlobalVector innMom;
       mtsMode_->momentumFromModeCartesian(inTSOS, innMom);
       if (fts.isValid()) {
     mtsMode_->momentumFromModeCartesian(fts, innMom);  
       }
       
       float scale = scRef->energy()/innMom.mag();
       const math::XYZTLorentzVector momentum(innMom.x()*scale,
                          innMom.y()*scale,
                          innMom.z()*scale,
                          scRef->energy());
       
       Electron ele(trackRef->charge(), momentum, trackRef->vertex());
       ele.setSuperCluster(scRef);
       edm::Ref<GsfTrackCollection> myRef(gsfTracksH, i);
       ele.setGsfTrack(myRef);
       outEle.push_back(ele);
     }
   }
 }

void EgammaHLTPixelMatchElectronAlgo::run	(	edm::Event &	e,
		reco::ElectronCollection &	outEle
	)

Definition at line 94 of file EgammaHLTPixelMatchElectronAlgo.cc.

References bsProducer_, edm::Event::getByLabel(), gsfTrackProducer_, process(), trackProducer_, and useGsfTracks_.

Referenced by EgammaHLTPixelMatchElectronProducers::produce().

                                                                                 {
   
   // get the input 
   edm::Handle<TrackCollection> tracksH;
   if (!useGsfTracks_)
     e.getByLabel(trackProducer_,tracksH);
 
   // get the input 
   edm::Handle<GsfTrackCollection> gsfTracksH;
   if (useGsfTracks_)
     e.getByLabel(gsfTrackProducer_, gsfTracksH);
 
   //Get the Beam Spot position
   edm::Handle<reco::BeamSpot> recoBeamSpotHandle;
   e.getByLabel(bsProducer_,recoBeamSpotHandle);
 
   // gets its position
   const BeamSpot::Point& bsPosition = recoBeamSpotHandle->position(); 
   Global3DPoint bs(bsPosition.x(),bsPosition.y(),0);
   process(tracksH, gsfTracksH, outEle, bs);
   
   return;
 }

void EgammaHLTPixelMatchElectronAlgo::setupES ( const edm::EventSetup & setup )

Definition at line 68 of file EgammaHLTPixelMatchElectronAlgo.cc.

References edm::eventsetup::EventSetupRecord::cacheIdentifier(), cacheIDMagField_, cacheIDTDGeom_, edm::EventSetup::get(), magField_, mtsTransform_, edm::ESHandle< class >::product(), trackerGeom_, and useGsfTracks_.

Referenced by EgammaHLTPixelMatchElectronProducers::produce().

                                                                      {
   //services
   
   bool updateField(false);
   if (cacheIDMagField_!=es.get<IdealMagneticFieldRecord>().cacheIdentifier()){
     updateField = true;
     cacheIDMagField_=es.get<IdealMagneticFieldRecord>().cacheIdentifier();
     es.get<IdealMagneticFieldRecord>().get(magField_);
   }
   
   if(useGsfTracks_){ //only need the geom and mtsTransform if we are doing gsf tracks
     bool updateGeometry(false);
     if (cacheIDTDGeom_!=es.get<TrackerDigiGeometryRecord>().cacheIdentifier()){
       updateGeometry = true;
        cacheIDTDGeom_=es.get<TrackerDigiGeometryRecord>().cacheIdentifier();
        es.get<TrackerDigiGeometryRecord>().get(trackerGeom_);
     }
     if ( updateField || updateGeometry || !mtsTransform_ ) {
       delete mtsTransform_;
       mtsTransform_ = new MultiTrajectoryStateTransform(trackerGeom_.product(),magField_.product());
     }
   }
   
   
 }