#include <FastElectronSeedGenerator.h>

Public Types
typedef TransientTrackingRecHit::ConstRecHitPointer	ConstRecHitPointer
enum	mode { HLT, offline, unknown }
typedef edm::OwnVector < TrackingRecHit >	PRecHitContainer
typedef TransientTrackingRecHit::RecHitContainer	RecHitContainer
typedef TransientTrackingRecHit::RecHitPointer	RecHitPointer
Public Member Functions
	FastElectronSeedGenerator (const edm::ParameterSet &pset, double pTMin, const edm::InputTag &beamSpot)
void	run (edm::Event &e, const reco::SuperClusterRefVector &sclRefs, const SiTrackerGSMatchedRecHit2DCollection theGSRecHits, const edm::SimTrackContainer theSimTracks, TrajectorySeedCollection *seeds, reco::ElectronSeedCollection &out)
void	setup (bool)
void	setupES (const edm::EventSetup &setup)
	~FastElectronSeedGenerator ()
Private Member Functions
void	addASeedToThisCluster (edm::Ref< reco::SuperClusterCollection > seedCluster, std::vector< TrackerRecHit > &theHits, const TrajectorySeed &theTrackerSeed, std::vector< reco::ElectronSeed > &result)
bool	prepareElTrackSeed (ConstRecHitPointer outerhit, ConstRecHitPointer innerhit, const GlobalPoint &vertexPos)
Private Attributes
math::XYZPoint	BSPosition_
float	deltaPhi1High_
float	deltaPhi1Low_
float	deltaPhi2_
bool	dynamicphiroad_
bool	fromTrackerSeeds_
float	highPtThreshold_
float	lowPtThreshold_
FastPixelHitMatcher *	myGSPixelMatcher
float	phimax2_
float	phimin2_
double	pTMin2
PTrajectoryStateOnDet	pts_
PRecHitContainer	recHits_
bool	searchInTIDTEC
float	sizeWindowENeg_
const edm::InputTag	theBeamSpot
const GeometricSearchTracker *	theGeomSearchTracker
TrajectorySeedCollection *	theInitialSeedColl
const MagneticField *	theMagField
const MagneticFieldMap *	theMagneticFieldMap
PropagatorWithMaterial *	thePropagator
const edm::EventSetup *	theSetup
const TrackerGeometry *	theTrackerGeometry
const TrackerInteractionGeometry *	theTrackerInteractionGeometry
KFUpdator *	theUpdator
double	zmax1_
double	zmin1_

Detailed Description

Class to generate the trajectory seed from two hits in the pixel detector which have been found compatible with an ECAL cluster.

Author:: Patrick Janot

Description: Top algorithm producing ElectronSeeds, ported from FAMOS

Implementation: future redesign...

Definition at line 51 of file FastElectronSeedGenerator.h.

Member Typedef Documentation

typedef TransientTrackingRecHit::ConstRecHitPointer FastElectronSeedGenerator::ConstRecHitPointer

Definition at line 57 of file FastElectronSeedGenerator.h.

typedef edm::OwnVector<TrackingRecHit> FastElectronSeedGenerator::PRecHitContainer

Definition at line 56 of file FastElectronSeedGenerator.h.

typedef TransientTrackingRecHit::RecHitContainer FastElectronSeedGenerator::RecHitContainer

Definition at line 59 of file FastElectronSeedGenerator.h.

typedef TransientTrackingRecHit::RecHitPointer FastElectronSeedGenerator::RecHitPointer

Definition at line 58 of file FastElectronSeedGenerator.h.

Member Enumeration Documentation

enum FastElectronSeedGenerator::mode

Enumerator:

HLT
offline
unknown

Definition at line 62 of file FastElectronSeedGenerator.h.

{HLT, offline, unknown};  //to be used later

Constructor & Destructor Documentation

FastElectronSeedGenerator::FastElectronSeedGenerator	(	const edm::ParameterSet &	pset,
		double	pTMin,
		const edm::InputTag &	beamSpot
	)

Definition at line 53 of file FastElectronSeedGenerator.cc.

References gather_cfg::cout, fromTrackerSeeds_, edm::ParameterSet::getParameter(), myGSPixelMatcher, and searchInTIDTEC.

  :
  dynamicphiroad_(pset.getParameter<bool>("dynamicPhiRoad")),
  lowPtThreshold_(pset.getParameter<double>("LowPtThreshold")),
  highPtThreshold_(pset.getParameter<double>("HighPtThreshold")),
  sizeWindowENeg_(pset.getParameter<double>("SizeWindowENeg")),
  phimin2_(pset.getParameter<double>("PhiMin2")),
  phimax2_(pset.getParameter<double>("PhiMax2")),
  deltaPhi1Low_(pset.getParameter<double>("DeltaPhi1Low")),
  deltaPhi1High_(pset.getParameter<double>("DeltaPhi1High")),
  deltaPhi2_(pset.getParameter<double>("DeltaPhi2")),
  pTMin2(pTMin*pTMin),
  myGSPixelMatcher(0),
  fromTrackerSeeds_(pset.getParameter<bool>("fromTrackerSeeds")),
  theUpdator(0), thePropagator(0),
  //   theMeasurementTracker(0),
  //   theNavigationSchool(0)
  theSetup(0), theBeamSpot(beamSpot)
{

#ifdef FAMOS_DEBUG
  std::cout << "FromTrackerSeeds  = " << fromTrackerSeeds_ << std::endl;
#endif

  // Instantiate the pixel hit matcher
  searchInTIDTEC = pset.getParameter<bool>("searchInTIDTEC");
  myGSPixelMatcher = new FastPixelHitMatcher(pset.getParameter<double>("ePhiMin1"),
                                           pset.getParameter<double>("ePhiMax1"),
                                           pset.getParameter<double>("pPhiMin1"),
                                           pset.getParameter<double>("pPhiMax1"),
                                           pset.getParameter<double>("PhiMin2"),
                                           pset.getParameter<double>("PhiMax2"),
                                           pset.getParameter<double>("z2MinB"),
                                           pset.getParameter<double>("z2MaxB"),
                                           pset.getParameter<double>("r2MinF"),
                                           pset.getParameter<double>("r2MaxF"),
                                           pset.getParameter<double>("rMinI"),
                                           pset.getParameter<double>("rMaxI"),
                                           pset.getParameter<bool>("searchInTIDTEC"));

}

FastElectronSeedGenerator::~FastElectronSeedGenerator ( )

Definition at line 98 of file FastElectronSeedGenerator.cc.

References myGSPixelMatcher, thePropagator, and theUpdator.

                                                      {

  //  delete theNavigationSchool;
  delete myGSPixelMatcher;
  //  delete myMatchPos;
  delete thePropagator;
  delete theUpdator;

}

Member Function Documentation

void FastElectronSeedGenerator::addASeedToThisCluster	(	edm::Ref< reco::SuperClusterCollection >	seedCluster,
		std::vector< TrackerRecHit > &	theHits,
		const TrajectorySeed &	theTrackerSeed,
		std::vector< reco::ElectronSeed > &	result
	)		`[private]`

Definition at line 308 of file FastElectronSeedGenerator.cc.

References alongMomentum, BSPosition_, FastPixelHitMatcher::compatibleHits(), gather_cfg::cout, deltaPhi1High_, deltaPhi1Low_, deltaPhi2_, dir, dynamicphiroad_, fromTrackerSeeds_, FastPixelHitMatcher::getVertex(), highPtThreshold_, lowPtThreshold_, myGSPixelMatcher, prepareElTrackSeed(), pts_, recHits_, alignCSCRings::s, FastPixelHitMatcher::set1stLayer(), FastPixelHitMatcher::set2ndLayer(), reco::ElectronSeed::setCaloCluster(), funct::sin(), sizeWindowENeg_, v, and TrackValidation_HighPurity_cff::valid.

Referenced by run().

{

  float clusterEnergy = seedCluster->energy();
  GlobalPoint clusterPos(seedCluster->position().x(),
                         seedCluster->position().y(),
                         seedCluster->position().z());
  const GlobalPoint vertexPos(BSPosition_.x(),BSPosition_.y(),BSPosition_.z());

#ifdef FAMOS_DEBUG
  std::cout << "[FastElectronSeedGenerator::seedsFromThisCluster] "
            << "new supercluster with energy: " << clusterEnergy << std::endl;
  std::cout << "[FastElectronSeedGenerator::seedsFromThisCluster] "
            << "and position: " << clusterPos << std::endl;
  std::cout << "Vertex position : " << vertexPos << std::endl;
#endif

  //Here change the deltaPhi window of the first pixel layer in function of the seed pT
  if (dynamicphiroad_) {
    float clusterEnergyT = clusterEnergy*sin(seedCluster->position().theta()) ;

    float deltaPhi1 = 0.875/clusterEnergyT + 0.055;
    if (clusterEnergyT < lowPtThreshold_) deltaPhi1= deltaPhi1Low_;
    if (clusterEnergyT > highPtThreshold_) deltaPhi1= deltaPhi1High_;

    float ephimin1 = -deltaPhi1*sizeWindowENeg_ ;
    float ephimax1 =  deltaPhi1*(1.-sizeWindowENeg_);
    float pphimin1 = -deltaPhi1*(1.-sizeWindowENeg_);
    float pphimax1 =  deltaPhi1*sizeWindowENeg_;

    float phimin2  = -deltaPhi2_/2.;
    float phimax2  =  deltaPhi2_/2.;

    myGSPixelMatcher->set1stLayer(ephimin1,ephimax1,pphimin1,pphimax1);
    myGSPixelMatcher->set2ndLayer(phimin2,phimax2);

  }



  PropagationDirection dir = alongMomentum;

  // Find the best pixel pair compatible with the cluster
  std::vector<std::pair<ConstRecHitPointer,ConstRecHitPointer> > compatPixelHits =
    myGSPixelMatcher->compatibleHits(clusterPos, vertexPos, clusterEnergy, theHits);

  // The corresponding origin vertex
  double vertexZ = myGSPixelMatcher->getVertex();
  GlobalPoint theVertex(BSPosition_.x(),BSPosition_.y(),vertexZ);

  // Create the Electron pixel seed.
  if (!compatPixelHits.empty() ) {
#ifdef FAMOS_DEBUG
    std::cout << "[FastElectronSeedGenerator::seedsFromThisCluster] "
              << " electron compatible hits found " << std::endl;
#endif
    // Pixel-matching case: create the seed from scratch
    if (!fromTrackerSeeds_) {

      std::vector<std::pair<ConstRecHitPointer,ConstRecHitPointer> >::iterator v;
      for (v = compatPixelHits.begin(); v != compatPixelHits.end(); ++v ) {

                bool valid = prepareElTrackSeed(v->first,v->second, theVertex);
                if (valid) {
                  reco::ElectronSeed s(pts_,recHits_,dir) ;
                  s.setCaloCluster(reco::ElectronSeed::CaloClusterRef(seedCluster)) ;
                  result.push_back(s);
            }

      }

    // Here we take instead the seed from a-priori seed collection
    } else {

      reco::ElectronSeed s(theTrackerSeed);
          s.setCaloCluster(reco::ElectronSeed::CaloClusterRef(seedCluster)) ;
          result.push_back(s);
    }

  }

#ifdef FAMOS_DEBUG
    else
      std::cout << "[FastElectronSeedGenerator::seedsFromThisCluster] "
                << " No electron compatible hits found " << std::endl;
#endif


  // And return !
  return ;

}

bool FastElectronSeedGenerator::prepareElTrackSeed	(	ConstRecHitPointer	outerhit,
		ConstRecHitPointer	innerhit,
		const GlobalPoint &	vertexPos
	)		`[private]`

Definition at line 404 of file FastElectronSeedGenerator.cc.

References edm::OwnVector< T, P >::clear(), TrajectoryStateOnSurface::isValid(), LogDebug, trajectoryStateTransform::persistentState(), PropagatorWithMaterial::propagate(), pts_, edm::OwnVector< T, P >::push_back(), recHits_, FreeTrajectoryState::setCurvilinearError(), thePropagator, and theSetup.

Referenced by addASeedToThisCluster().

{

  // debug prints
  LogDebug("") <<"[FastElectronSeedGenerator::prepareElTrackSeed] "
               << "inner PixelHit   x,y,z "<<innerhit->globalPosition();
  LogDebug("") <<"[FastElectronSeedGenerator::prepareElTrackSeed] "
               << "outer PixelHit   x,y,z "<<outerhit->globalPosition();

  // make a spiral from the two hits and the vertex position
  FastHelix helix(outerhit->globalPosition(),innerhit->globalPosition(),vertexPos,*theSetup);
  if ( !helix.isValid()) return false;

  FreeTrajectoryState fts = helix.stateAtVertex();

  // Give infinite errors to start the fit (no pattern recognition here).
  AlgebraicSymMatrix55 errorMatrix= AlgebraicMatrixID();
  fts.setCurvilinearError(errorMatrix*100.);

   TrajectoryStateOnSurface propagatedState = thePropagator->propagate(fts,innerhit->det()->surface()) ;
  if (!propagatedState.isValid()) return false;

  // The persitent trajectory state
  pts_ =  trajectoryStateTransform::persistentState(propagatedState, innerhit->geographicalId().rawId());

  // The corresponding rechits
  recHits_.clear();
  recHits_.push_back(innerhit->hit()->clone());
  recHits_.push_back(outerhit->hit()->clone());


  return true;

}

void FastElectronSeedGenerator::run	(	edm::Event &	e,
		const reco::SuperClusterRefVector &	sclRefs,
		const SiTrackerGSMatchedRecHit2DCollection *	theGSRecHits,
		const edm::SimTrackContainer *	theSimTracks,
		TrajectorySeedCollection *	seeds,
		reco::ElectronSeedCollection &	out
	)

Definition at line 142 of file FastElectronSeedGenerator.cc.

References addASeedToThisCluster(), BSPosition_, gather_cfg::cout, fromTrackerSeeds_, edm::RangeMap< ID, C, P >::get(), edm::Event::getByLabel(), i, edm::EventBase::id(), edm::RangeMap< ID, C, P >::ids(), TrackerRecHit::layerNumber(), LogDebug, CoreSimTrack::momentum(), myGSPixelMatcher, pTMin2, TrajectorySeed::recHits(), TrackerRecHit::ringNumber(), searchInTIDTEC, FastPixelHitMatcher::set1stLayerZRange(), findQualityFiles::size, edm::RefVector< C, T, F >::size(), edm::RangeMap< ID, C, P >::size(), mathSSE::sqrt(), TrackerRecHit::subDetId(), theBeamSpot, theInitialSeedColl, and theTrackerGeometry.

Referenced by FastElectronSeedProducer::produce().

                                                                       {

  // Take the seed collection.
  theInitialSeedColl=seeds;

  // Get the beam spot
  edm::Handle<reco::BeamSpot> recoBeamSpotHandle;
  e.getByLabel(theBeamSpot,recoBeamSpotHandle);

  // Get its position
  BSPosition_ = recoBeamSpotHandle->position();
  double sigmaZ=recoBeamSpotHandle->sigmaZ();
  double sigmaZ0Error=recoBeamSpotHandle->sigmaZ0Error();
  double sq=sqrt(sigmaZ*sigmaZ+sigmaZ0Error*sigmaZ0Error);
  double zmin1 = BSPosition_.z()-3*sq;
  double zmax1 = BSPosition_.z()+3*sq;
#ifdef FAMOS_DEBUG
  std::cout << "Z Range for pixel matcher : " << zmin1 << " " << BSPosition_.z() << " " << zmax1 << std::endl;
#endif
  myGSPixelMatcher->set1stLayerZRange(zmin1,zmax1);

  // A map of vector of pixel seeds, for each clusters
  std::map<unsigned,std::vector<reco::ElectronSeed> > myPixelSeeds;

  // No seeding attempted if no hits !
  if(theGSRecHits->size() == 0) return;

  if ( !fromTrackerSeeds_ ) {

    // The vector of simTrack Id's carrying GSRecHits
    const std::vector<unsigned> theSimTrackIds = theGSRecHits->ids();

    // Loop over the simTrack carrying GSRecHits
    for ( unsigned tkId=0;  tkId != theSimTrackIds.size(); ++tkId ) {

      unsigned simTrackId = theSimTrackIds[tkId];
      const SimTrack& theSimTrack = (*theSimTracks)[simTrackId];

      // Request a minimum pT for the sim track
      if ( theSimTrack.momentum().perp2() < pTMin2 ) continue;

      // Request a minimum number of RecHits (total and in the pixel detector)
      unsigned numberOfRecHits = 0;

      // The vector of rechits for seeding

      // 1) Cluster-pixel match seeding:
      //    Save a collection of Pixel +TEC +TID hits for seeding electrons
      std::vector<unsigned> layerHit(6,static_cast<unsigned>(0));
      // const SiTrackerGSMatchedRecHit2D *hit;
      TrackerRecHit currentHit;
      std::vector<TrackerRecHit> theHits;
      TrajectorySeed theTrackerSeed;

      SiTrackerGSMatchedRecHit2DCollection::range theRecHitRange = theGSRecHits->get(simTrackId);
      SiTrackerGSMatchedRecHit2DCollection::const_iterator theRecHitRangeIteratorBegin = theRecHitRange.first;
      SiTrackerGSMatchedRecHit2DCollection::const_iterator theRecHitRangeIteratorEnd   = theRecHitRange.second;
      SiTrackerGSMatchedRecHit2DCollection::const_iterator iterRecHit;
      SiTrackerGSMatchedRecHit2DCollection::const_iterator iterRecHit2;

      for ( iterRecHit = theRecHitRangeIteratorBegin;
            iterRecHit != theRecHitRangeIteratorEnd;
            ++iterRecHit) {
        ++numberOfRecHits;

        currentHit = TrackerRecHit(&(*iterRecHit),theTrackerGeometry);
        if ( ( currentHit.subDetId() <= 2 ) ||  // Pixel Hits
             // Add TID/TEC (optional)
             ( searchInTIDTEC &&
               ( ( currentHit.subDetId() == 3 &&
                   currentHit.ringNumber() < 3 &&
                   currentHit.layerNumber() < 3 ) || // TID first two rings, first two layers
                 ( currentHit.subDetId() == 6 &&
                   currentHit.ringNumber() < 3 &&
                   currentHit.layerNumber() < 3 ) ) ) ) // TEC first two rings, first two layers
          theHits.push_back(currentHit);
      }

      // At least 3 hits
      if ( numberOfRecHits < 3 ) continue;

      // At least 2 pixel hits
      if ( theHits.size() < 2 ) continue;

      // Loop over clusters

      unsigned csize = sclRefs.size();
      for  (unsigned int i=0;i<csize;++i) {

        // Find the pixel seeds (actually only the best one is returned)
        LogDebug ("run") << "new cluster, calling addAseedFromThisCluster";
        addASeedToThisCluster(sclRefs[i],theHits,theTrackerSeed,myPixelSeeds[i]);

      }

    }
  // 2) Check if the seed is in the a-priori seed collection
  } else {

    // Loop over the tracker seed
#ifdef FAMOS_DEBUG
    std::cout << "We have " << seeds->size() << " tracker seeds!" << std::endl;
#endif
    for (unsigned int i=0;i<seeds->size();++i) {

      TrackerRecHit currentHit;
      std::vector<TrackerRecHit> theHits;
      const TrajectorySeed& theTrackerSeed = (*seeds)[i];
      TrajectorySeed::range theSeedRange=theTrackerSeed.recHits();
      TrajectorySeed::const_iterator theSeedRangeIteratorBegin = theSeedRange.first;
      TrajectorySeed::const_iterator theSeedRangeIteratorEnd   = theSeedRange.second;
      TrajectorySeed::const_iterator theSeedItr = theSeedRangeIteratorBegin;

      for ( ; theSeedItr != theSeedRangeIteratorEnd; ++theSeedItr ) {
        const SiTrackerGSMatchedRecHit2D * theSeedingRecHit =
          (const SiTrackerGSMatchedRecHit2D*) (&(*theSeedItr));
        currentHit = TrackerRecHit(theSeedingRecHit,theTrackerGeometry);
        theHits.push_back(currentHit);
      }

      // Loop over clusters
      unsigned csize = sclRefs.size();
      for  (unsigned int i=0;i<csize;++i) {

        // Find the pixel seeds (actually only the best one is returned)
#ifdef FAMOS_DEBUG
        std::cout << "new cluster, calling addAseedFromThisCluster" << std::endl;
#endif
        addASeedToThisCluster(sclRefs[i],theHits,theTrackerSeed,myPixelSeeds[i]);

      }
      // End loop over clusters
    }
    // End loop over seeds
  }
  // end else

  // Back to the expected collection

  std::map<unsigned,std::vector<reco::ElectronSeed> >::const_iterator px = myPixelSeeds.begin();
  std::map<unsigned,std::vector<reco::ElectronSeed> >::const_iterator pxEnd = myPixelSeeds.end();
  for ( ; px!=pxEnd; ++px ) {
    unsigned nSeeds = (px->second).size();
    for ( unsigned ipx = 0; ipx<nSeeds; ++ipx ) {
      out.push_back((px->second)[ipx]);
      reco::ElectronSeed is = px->second[ipx];
    }
  }

  LogDebug ("run") << ": For event "<<e.id();
  LogDebug ("run") <<"Nr of superclusters: "<<sclRefs.size()
                   <<", no. of ElectronSeeds found  = " << out.size();
#ifdef FAMOS_DEBUG
  std::cout << ": For event "<<e.id() << std::endl;
  std::cout <<"Nr of superclusters: "<<sclRefs.size()
            <<", no. of ElectronSeeds found  = " << out.size() << std::endl;
#endif

}

void FastElectronSeedGenerator::setup ( bool )

Referenced by setupES().

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

Definition at line 109 of file FastElectronSeedGenerator.cc.

References alongMomentum, geometry, edm::EventSetup::get(), myGSPixelMatcher, FastPixelHitMatcher::setES(), setup(), theGeomSearchTracker, theMagField, theMagneticFieldMap, thePropagator, theSetup, theTrackerGeometry, and theTrackerInteractionGeometry.

Referenced by FastElectronSeedProducer::beginRun().

                                                                  {

  theSetup= &setup;

  edm::ESHandle<MagneticField> pMF;
  setup.get<IdealMagneticFieldRecord>().get(pMF);
  theMagField = &(*pMF);

  edm::ESHandle<TrackerGeometry>        geometry;
  setup.get<TrackerDigiGeometryRecord>().get(geometry);
  theTrackerGeometry = &(*geometry);

  edm::ESHandle<GeometricSearchTracker> recoGeom;
  setup.get<TrackerRecoGeometryRecord>().get( recoGeom );
  theGeomSearchTracker = &(*recoGeom);

  edm::ESHandle<TrackerInteractionGeometry> interGeom;
  setup.get<TrackerInteractionGeometryRecord>().get( interGeom );
  theTrackerInteractionGeometry = &(*interGeom);

  edm::ESHandle<MagneticFieldMap> fieldMap;
  setup.get<MagneticFieldMapRecord>().get(fieldMap);
  theMagneticFieldMap = &(*fieldMap);

  thePropagator = new PropagatorWithMaterial(alongMomentum,.000511,&(*theMagField));

  myGSPixelMatcher->setES(theMagneticFieldMap,
                          theTrackerGeometry,
                          theGeomSearchTracker,
                          theTrackerInteractionGeometry);

}