TrackExtrapolator Class Reference

#include <RecoTracker/TrackExtrapolator/src/TrackExtrapolator.cc>

Inheritance diagram for TrackExtrapolator:

Public Member Functions
	TrackExtrapolator (const edm::ParameterSet &)
	~TrackExtrapolator () override
Public Member Functions inherited from edm::stream::EDProducer<>
	EDProducer ()=default
bool	hasAbilityToProduceInBeginLumis () const final
bool	hasAbilityToProduceInBeginProcessBlocks () const final
bool	hasAbilityToProduceInBeginRuns () const final
bool	hasAbilityToProduceInEndLumis () const final
bool	hasAbilityToProduceInEndProcessBlocks () const final
bool	hasAbilityToProduceInEndRuns () const final

Private Member Functions
void	produce (edm::Event &, const edm::EventSetup &) override
bool	propagateTrackToVolume (const reco::Track &fTrack, const MagneticField &fField, const Propagator &fPropagator, const FiducialVolume &volume, reco::TrackBase::Point &resultPos, reco::TrackBase::Vector &resultMom)
	track quality of the tracks we care about More...

Private Attributes
reco::TrackBase::TrackQuality	trackQuality_
	Input tracks. More...
edm::EDGetTokenT< reco::TrackCollection >	tracksSrc_

Additional Inherited Members
Public Types inherited from edm::stream::EDProducer<>
typedef CacheContexts< T... >	CacheTypes
typedef CacheTypes::GlobalCache	GlobalCache
typedef AbilityChecker< T... >	HasAbility
typedef CacheTypes::LuminosityBlockCache	LuminosityBlockCache
typedef LuminosityBlockContextT< LuminosityBlockCache, RunCache, GlobalCache >	LuminosityBlockContext
typedef CacheTypes::LuminosityBlockSummaryCache	LuminosityBlockSummaryCache
typedef CacheTypes::RunCache	RunCache
typedef RunContextT< RunCache, GlobalCache >	RunContext
typedef CacheTypes::RunSummaryCache	RunSummaryCache

Detailed Description

Description: Extrapolates tracks to Calo Face. Migrating this functionality from RecoJets/JetAssociationAlgorithms/JetTracksAssociatorDRCalo.h, which will now essentially be defunct.

Implementation:

Definition at line 57 of file TrackExtrapolator.h.

Constructor & Destructor Documentation

TrackExtrapolator()

TrackExtrapolator::TrackExtrapolator ( const edm::ParameterSet &  iConfig )

explicit

Definition at line 10 of file TrackExtrapolator.cc.

                                                                   {
  tracksSrc_ = consumes<reco::TrackCollection>(iConfig.getParameter<edm::InputTag>("trackSrc"));
  trackQuality_ = reco::TrackBase::qualityByName(iConfig.getParameter<std::string>("trackQuality"));
  if (trackQuality_ == reco::TrackBase::undefQuality) {  // we have a problem
    throw cms::Exception("InvalidInput") << "Unknown trackQuality value '"
                                         << iConfig.getParameter<std::string>("trackQuality")
                                         << "'. See possible values in 'reco::TrackBase::qualityByName'";
  }
 
  produces<std::vector<reco::TrackExtrapolation>>();
}

References Exception, edm::ParameterSet::getParameter(), reco::TrackBase::qualityByName(), AlCaHLTBitMon_QueryRunRegistry::string, trackQuality_, tracksSrc_, and reco::TrackBase::undefQuality.

~TrackExtrapolator()

TrackExtrapolator::~TrackExtrapolator ( )

override

Definition at line 22 of file TrackExtrapolator.cc.

{}

Member Function Documentation

produce()

void TrackExtrapolator::produce ( edm::Event &  iEvent, const edm::EventSetup &  iSetup  )

overrideprivate

Definition at line 29 of file TrackExtrapolator.cc.

                                                                             {
  // get stuff from Event Setup
  edm::ESHandle<MagneticField> field_h;
  iSetup.get<IdealMagneticFieldRecord>().get(field_h);
  edm::ESHandle<Propagator> propagator_h;
  iSetup.get<TrackingComponentsRecord>().get("SteppingHelixPropagatorAlong", propagator_h);
  edm::ESHandle<DetIdAssociator> ecalDetIdAssociator_h;
  iSetup.get<DetIdAssociatorRecord>().get("EcalDetIdAssociator", ecalDetIdAssociator_h);
  FiducialVolume const& ecalvolume = ecalDetIdAssociator_h->volume();
 
  // get stuff from Event
  edm::Handle<reco::TrackCollection> tracks_h;
  iEvent.getByToken(tracksSrc_, tracks_h);
 
  auto extrapolations = std::make_unique<std::vector<reco::TrackExtrapolation>>();
 
  // Get list of tracks we want to extrapolate
  std::vector<reco::TrackRef> goodTracks;
  for (reco::TrackCollection::const_iterator trkBegin = tracks_h->begin(), trkEnd = tracks_h->end(), itrk = trkBegin;
       itrk != trkEnd;
       ++itrk) {
    reco::TrackBase::TrackQuality trackQuality = reco::TrackBase::TrackQuality(trackQuality_);
 
    // Cut on track quality
    if (itrk->quality(trackQuality)) {
      goodTracks.push_back(reco::TrackRef(tracks_h, itrk - trkBegin));
    }
  }
  std::vector<reco::TrackBase::Point> vresultPos(1);
  std::vector<reco::TrackBase::Vector> vresultMom(1);
 
  // Now loop through the list of tracks and extrapolate them
  for (std::vector<reco::TrackRef>::const_iterator trkBegin = goodTracks.begin(),
                                                   trkEnd = goodTracks.end(),
                                                   itrk = trkBegin;
       itrk != trkEnd;
       ++itrk) {
    if (propagateTrackToVolume(**itrk, *field_h, *propagator_h, ecalvolume, vresultPos[0], vresultMom[0])) {
      extrapolations->push_back(reco::TrackExtrapolation(*itrk, vresultPos, vresultMom));
    }
  }
  iEvent.put(std::move(extrapolations));
}

References j2tParametersCALO_cfi::extrapolations, edm::EventSetup::get(), get, goodTracks_cfi::goodTracks, iEvent, eostools::move(), propagateTrackToVolume(), StandaloneTrackMonitor_cfi::trackQuality, trackQuality_, tracksSrc_, and DetIdAssociator::volume().

propagateTrackToVolume()

bool TrackExtrapolator::propagateTrackToVolume ( const reco::Track &  fTrack, const MagneticField &  fField, const Propagator &  fPropagator, const FiducialVolume &  volume, reco::TrackBase::Point &  resultPos, reco::TrackBase::Vector &  resultMom  )

private

track quality of the tracks we care about

Propagate a track to a given radius, given the magnetic field and the propagator. Store the resulting position, momentum, and direction.

Definition at line 75 of file TrackExtrapolator.cc.

                                                                               {
  GlobalPoint trackPosition(fTrack.vx(), fTrack.vy(), fTrack.vz());   // reference point
  GlobalVector trackMomentum(fTrack.px(), fTrack.py(), fTrack.pz());  // reference momentum
  if (fTrack.extra().isAvailable()) {                                 // use outer point information, if available
    trackPosition = GlobalPoint(fTrack.outerX(), fTrack.outerY(), fTrack.outerZ());
    trackMomentum = GlobalVector(fTrack.outerPx(), fTrack.outerPy(), fTrack.outerPz());
  }
 
  GlobalTrajectoryParameters trackParams(trackPosition, trackMomentum, fTrack.charge(), &fField);
  FreeTrajectoryState trackState(trackParams);
 
  TrajectoryStateOnSurface propagatedInfo = fPropagator.propagate(
      trackState, *Cylinder::build(volume.minR(), Surface::PositionType(0, 0, 0), Surface::RotationType()));
 
  // if the track went through either side of the endcaps, repropagate the track
  double minz = volume.minZ();
  if (propagatedInfo.isValid() && propagatedInfo.globalPosition().z() > minz) {
    propagatedInfo =
        fPropagator.propagate(trackState, *Plane::build(Surface::PositionType(0, 0, minz), Surface::RotationType()));
 
  } else if (propagatedInfo.isValid() && propagatedInfo.globalPosition().z() < -minz) {
    propagatedInfo =
        fPropagator.propagate(trackState, *Plane::build(Surface::PositionType(0, 0, -minz), Surface::RotationType()));
  }
 
  if (propagatedInfo.isValid()) {
    resultPos = propagatedInfo.globalPosition();
    resultMom = propagatedInfo.globalMomentum();
    return true;
  } else {
    return false;
  }
}

References Plane::build(), Cylinder::build(), reco::TrackBase::charge(), reco::Track::extra(), TrajectoryStateOnSurface::globalMomentum(), TrajectoryStateOnSurface::globalPosition(), edm::Ref< C, T, F >::isAvailable(), TrajectoryStateOnSurface::isValid(), FiducialVolume::minR(), FiducialVolume::minZ(), reco::Track::outerPx(), reco::Track::outerPy(), reco::Track::outerPz(), reco::Track::outerX(), reco::Track::outerY(), reco::Track::outerZ(), Propagator::propagate(), reco::TrackBase::px(), reco::TrackBase::py(), reco::TrackBase::pz(), reco::btau::trackMomentum, reco::TrackBase::vx(), reco::TrackBase::vy(), reco::TrackBase::vz(), and PV3DBase< T, PVType, FrameType >::z().

Referenced by produce().

Member Data Documentation

trackQuality_

reco::TrackBase::TrackQuality TrackExtrapolator::trackQuality_

private

Input tracks.

Definition at line 68 of file TrackExtrapolator.h.

Referenced by produce(), and TrackExtrapolator().

tracksSrc_

edm::EDGetTokenT<reco::TrackCollection> TrackExtrapolator::tracksSrc_

private

Definition at line 67 of file TrackExtrapolator.h.

Referenced by produce(), and TrackExtrapolator().