#include <SeedFromConsecutiveHitsCreator.h>

Inheritance diagram for SeedFromConsecutiveHitsCreator:

Public Member Functions
virtual void	init (const TrackingRegion &region, const edm::EventSetup &es, const SeedComparitor *filter) GCC11_FINAL
virtual void	makeSeed (TrajectorySeedCollection &seedCollection, const SeedingHitSet &hits) GCC11_FINAL
	SeedFromConsecutiveHitsCreator (const std::string &propagator="PropagatorWithMaterial", double seedMomentumForBOFF=-5.0, double aOriginTransverseErrorMultiplier=1.0, double aMinOneOverPtError=1.0)
	SeedFromConsecutiveHitsCreator (const edm::ParameterSet &cfg)
virtual	~SeedFromConsecutiveHitsCreator ()
Protected Attributes
edm::ESHandle< MagneticField >	bfield
const SeedComparitor *	filter = nullptr
bool	isBOFF = false
float	nomField
edm::ESHandle< Propagator >	propagatorHandle
const TrackingRegion *	region = nullptr
double	theBOFFMomentum
double	theMinOneOverPtError
double	theOriginTransverseErrorMultiplier
std::string	thePropagatorLabel
edm::ESHandle< TrackerGeometry >	tracker
Private Member Functions
void	buildSeed (TrajectorySeedCollection &seedCollection, const SeedingHitSet &hits, const FreeTrajectoryState &fts) const dso_hidden
bool	checkHit (const TrajectoryStateOnSurface &tsos, const TransientTrackingRecHit::ConstRecHitPointer &hit) const dso_hidden
CurvilinearTrajectoryError	initialError (float sin2Theta) const dso_hidden
virtual bool	initialKinematic (GlobalTrajectoryParameters &kine, const SeedingHitSet &hits) const
TransientTrackingRecHit::RecHitPointer	refitHit (const TransientTrackingRecHit::ConstRecHitPointer &hit, const TrajectoryStateOnSurface &state) const dso_hidden

Detailed Description

Definition at line 15 of file SeedFromConsecutiveHitsCreator.h.

Constructor & Destructor Documentation

SeedFromConsecutiveHitsCreator::SeedFromConsecutiveHitsCreator ( const edm::ParameterSet & cfg ) [inline]

Definition at line 18 of file SeedFromConsecutiveHitsCreator.h.

                                                              :
    thePropagatorLabel(cfg.getParameter<std::string>("propagator")),
    theBOFFMomentum(cfg.existsAs<double>("SeedMomentumForBOFF") ? cfg.getParameter<double>("SeedMomentumForBOFF") : 5.0),
    theOriginTransverseErrorMultiplier(cfg.existsAs<double>("OriginTransverseErrorMultiplier") ? cfg.getParameter<double>("OriginTransverseErrorMultiplier") : 1.0),
    theMinOneOverPtError(cfg.existsAs<double>("MinOneOverPtError") ? cfg.getParameter<double>("MinOneOverPtError") : 1.0)
      {}

SeedFromConsecutiveHitsCreator::SeedFromConsecutiveHitsCreator	(	const std::string &	propagator = `"PropagatorWithMaterial"`,
		double	seedMomentumForBOFF = `-5.0`,
		double	aOriginTransverseErrorMultiplier = `1.0`,
		double	aMinOneOverPtError = `1.0`
	)		`[inline]`

Definition at line 25 of file SeedFromConsecutiveHitsCreator.h.

    : thePropagatorLabel(propagator), theBOFFMomentum(seedMomentumForBOFF), 
    theOriginTransverseErrorMultiplier(aOriginTransverseErrorMultiplier), theMinOneOverPtError(aMinOneOverPtError) { }

SeedFromConsecutiveHitsCreator::~SeedFromConsecutiveHitsCreator ( ) [virtual]

Definition at line 23 of file SeedFromConsecutiveHitsCreator.cc.

{}

Member Function Documentation

void SeedFromConsecutiveHitsCreator::buildSeed	(	TrajectorySeedCollection &	seedCollection,
		const SeedingHitSet &	hits,
		const FreeTrajectoryState &	fts
	)		const `[private]`

Definition at line 106 of file SeedFromConsecutiveHitsCreator.cc.

References alongMomentum, checkHit(), SeedComparitor::compatible(), filter, TrackingRecHit::geographicalId(), TrajectoryStateOnSurface::isValid(), trajectoryStateTransform::persistentState(), Propagator::propagate(), LargeD0_PixelPairStep_cff::propagator, edm::OwnVector< T, P >::push_back(), DetId::rawId(), refitHit(), SeedingHitSet::size(), and tracker.

Referenced by makeSeed().

{
  const Propagator*  propagator = &(*propagatorHandle);
  
  // get updator
  KFUpdator  updator;
  
  // Now update initial state track using information from seed hits.
  
  TrajectoryStateOnSurface updatedState;
  edm::OwnVector<TrackingRecHit> seedHits;
  
  const TrackingRecHit* hit = 0;
  for ( unsigned int iHit = 0; iHit < hits.size(); iHit++) {
    hit = hits[iHit]->hit();
    TrajectoryStateOnSurface state = (iHit==0) ? 
      propagator->propagate(fts,tracker->idToDet(hit->geographicalId())->surface())
      : propagator->propagate(updatedState, tracker->idToDet(hit->geographicalId())->surface());
    if (!state.isValid()) return;
    
    TransientTrackingRecHit::ConstRecHitPointer const &  tth = hits[iHit]; 
    
    TransientTrackingRecHit::RecHitPointer const & newtth = refitHit( tth, state);
    
    if (!checkHit(state,newtth)) return;

    updatedState =  updator.update(state, *newtth);
    if (!updatedState.isValid()) return;
    
    seedHits.push_back(newtth->hit()->clone());

  } 

  
  PTrajectoryStateOnDet const & PTraj = 
    trajectoryStateTransform::persistentState(updatedState, hit->geographicalId().rawId());
  TrajectorySeed seed(PTraj,std::move(seedHits),alongMomentum); 
  if ( !filter || filter->compatible(seed)) seedCollection.push_back(seed);

}

bool SeedFromConsecutiveHitsCreator::checkHit	(	const TrajectoryStateOnSurface &	tsos,
		const TransientTrackingRecHit::ConstRecHitPointer &	hit
	)		const `[private]`

Definition at line 158 of file SeedFromConsecutiveHitsCreator.cc.

References SeedComparitor::compatible(), and filter.

Referenced by buildSeed().

{ 
    return (filter ? filter->compatible(tsos,hit) : true); 
}

void SeedFromConsecutiveHitsCreator::init	(	const TrackingRegion &	region,
		const edm::EventSetup &	es,
		const SeedComparitor *	filter
	)		`[virtual]`

Implements SeedCreator.

Definition at line 25 of file SeedFromConsecutiveHitsCreator.cc.

References bfield, filter, edm::EventSetup::get(), isBOFF, nomField, propagatorHandle, region, thePropagatorLabel, and tracker.

Referenced by SeedGeneratorFromProtoTracksEDProducer::produce().

                                         {
  region = &iregion;
  filter = ifilter;
  // get tracker
  es.get<TrackerDigiGeometryRecord>().get(tracker);
  // get propagator
  es.get<TrackingComponentsRecord>().get(thePropagatorLabel, propagatorHandle);
  // mag field
  es.get<IdealMagneticFieldRecord>().get(bfield);
  nomField = bfield->nominalValue();
  isBOFF = (0==nomField);  
}

CurvilinearTrajectoryError SeedFromConsecutiveHitsCreator::initialError ( float sin2Theta ) const [private]

Definition at line 85 of file SeedFromConsecutiveHitsCreator.cc.

References funct::C, max(), TrackingRegion::originRBound(), TrackingRegion::originZBound(), TrackingRegion::ptMin(), region, funct::sqr(), theMinOneOverPtError, and theOriginTransverseErrorMultiplier.

Referenced by makeSeed().

{
  // Set initial uncertainty on track parameters, using only P.V. constraint and no hit
  // information.
  AlgebraicSymMatrix55 C = ROOT::Math::SMatrixIdentity();

// FIXME: minC00. Prevent apriori uncertainty in 1/P from being too small, 
// to avoid instabilities.
// N.B. This parameter needs optimising ...
  // Probably OK based on quick study: KS 22/11/12.
  float sin2th = sin2Theta;
  float minC00 = sqr(theMinOneOverPtError);
  C[0][0] = std::max(sin2th/sqr(region->ptMin()), minC00);
  float zErr = sqr(region->originZBound());
  float transverseErr = sqr(theOriginTransverseErrorMultiplier*region->originRBound());
  C[3][3] = transverseErr;
  C[4][4] = zErr*sin2th + transverseErr*(1.f-sin2th);

  return CurvilinearTrajectoryError(C);
}

bool SeedFromConsecutiveHitsCreator::initialKinematic	(	GlobalTrajectoryParameters &	kine,
		const SeedingHitSet &	hits
	)		const `[private, virtual]`

Reimplemented in GCC11_FINAL< T, TOPO >, and GCC11_FINAL< T, TOPO >.

Definition at line 57 of file SeedFromConsecutiveHitsCreator.cc.

References bfield, GlobalTrajectoryParameters::charge(), SeedComparitor::compatible(), filter, isBOFF, GlobalTrajectoryParameters::momentum(), nomField, TrackingRegion::origin(), GlobalTrajectoryParameters::position(), region, theBOFFMomentum, Vector3DBase< T, FrameTag >::unit(), and unlikely.

Referenced by makeSeed().

                                                                                       {

  TransientTrackingRecHit::ConstRecHitPointer tth1 = hits[0];
  TransientTrackingRecHit::ConstRecHitPointer tth2 = hits[1];
  const GlobalPoint& vertexPos = region->origin();

  FastHelix helix(tth2->globalPosition(), tth1->globalPosition(), vertexPos, nomField,&*bfield);
  if (helix.isValid()) {
    kine = helix.stateAtVertex();
  } else {
    GlobalVector initMomentum(tth2->globalPosition() - vertexPos);
    initMomentum *= (100./initMomentum.perp()); 
    kine = GlobalTrajectoryParameters(vertexPos, initMomentum, 1, &*bfield);
  } 

  if unlikely(isBOFF && (theBOFFMomentum > 0)) {
      kine = GlobalTrajectoryParameters(kine.position(),
                                        kine.momentum().unit() * theBOFFMomentum,
                                        kine.charge(),
                                        &*bfield);
  }
  return (filter ? filter->compatible(hits, kine, helix, *region) : true); 
}

void SeedFromConsecutiveHitsCreator::makeSeed	(	TrajectorySeedCollection &	seedCollection,
		const SeedingHitSet &	hits
	)		`[virtual]`

Implements SeedCreator.

Definition at line 40 of file SeedFromConsecutiveHitsCreator.cc.

References buildSeed(), error, initialError(), initialKinematic(), PV3DBase< T, PVType, FrameType >::mag2(), GlobalTrajectoryParameters::momentum(), PV3DBase< T, PVType, FrameType >::perp2(), and SeedingHitSet::size().

Referenced by SeedGeneratorFromProtoTracksEDProducer::produce().

                                                                          {
  if ( hits.size() < 2) return;

  GlobalTrajectoryParameters kine;
  if (!initialKinematic(kine, hits)) return;

  float sin2Theta = kine.momentum().perp2()/kine.momentum().mag2();

  CurvilinearTrajectoryError error = initialError(sin2Theta);
  FreeTrajectoryState fts(kine, error);

  buildSeed(seedCollection,hits,fts); 
}

TransientTrackingRecHit::RecHitPointer SeedFromConsecutiveHitsCreator::refitHit	(	const TransientTrackingRecHit::ConstRecHitPointer &	hit,
		const TrajectoryStateOnSurface &	state
	)		const `[private]`