SeedFromConsecutiveHitsStraightLineCreator Class Reference

#include <SeedFromConsecutiveHitsStraightLineCreator.h>

Inheritance diagram for SeedFromConsecutiveHitsStraightLineCreator:

Public Member Functions
	SeedFromConsecutiveHitsStraightLineCreator (const edm::ParameterSet &cfg)
virtual	~SeedFromConsecutiveHitsStraightLineCreator ()
Public Member Functions inherited from SeedFromConsecutiveHitsCreator
	SeedFromConsecutiveHitsCreator (const edm::ParameterSet &cfg)
	SeedFromConsecutiveHitsCreator (const std::string &propagator="PropagatorWithMaterial", double seedMomentumForBOFF=-5.0)
virtual const TrajectorySeed *	trajectorySeed (TrajectorySeedCollection &seedCollection, const SeedingHitSet &ordered, const TrackingRegion &region, const edm::EventSetup &es)
virtual	~SeedFromConsecutiveHitsCreator ()
Public Member Functions inherited from SeedCreator
virtual	~SeedCreator ()

Protected Member Functions
virtual GlobalTrajectoryParameters	initialKinematic (const SeedingHitSet &hits, const TrackingRegion &region, const edm::EventSetup &es) const
Protected Member Functions inherited from SeedFromConsecutiveHitsCreator
virtual const TrajectorySeed *	buildSeed (TrajectorySeedCollection &seedCollection, const SeedingHitSet &hits, const FreeTrajectoryState &fts, const edm::EventSetup &es) const
virtual bool	checkHit (const TrajectoryStateOnSurface &, const TransientTrackingRecHit::ConstRecHitPointer &hit, const edm::EventSetup &es) const
virtual CurvilinearTrajectoryError	initialError (const TrackingRegion &region, float sinTheta) const
virtual TransientTrackingRecHit::RecHitPointer	refitHit (const TransientTrackingRecHit::ConstRecHitPointer &hit, const TrajectoryStateOnSurface &state) const

Additional Inherited Members
Protected Attributes inherited from SeedFromConsecutiveHitsCreator
double	theBOFFMomentum
std::string	thePropagatorLabel

Detailed Description

Definition at line 8 of file SeedFromConsecutiveHitsStraightLineCreator.h.

Constructor & Destructor Documentation

SeedFromConsecutiveHitsStraightLineCreator::SeedFromConsecutiveHitsStraightLineCreator ( const edm::ParameterSet &  cfg )

inline

Definition at line 11 of file SeedFromConsecutiveHitsStraightLineCreator.h.

                                                                          :
    SeedFromConsecutiveHitsCreator(cfg) { }

virtual SeedFromConsecutiveHitsStraightLineCreator::~SeedFromConsecutiveHitsStraightLineCreator ( )

inlinevirtual

Definition at line 14 of file SeedFromConsecutiveHitsStraightLineCreator.h.

{}

Member Function Documentation

GlobalTrajectoryParameters SeedFromConsecutiveHitsStraightLineCreator::initialKinematic ( const SeedingHitSet &  hits, const TrackingRegion &  region, const edm::EventSetup &  es  ) const

protectedvirtual

Reimplemented from SeedFromConsecutiveHitsCreator.

Definition at line 11 of file SeedFromConsecutiveHitsStraightLineCreator.cc.

References edm::EventSetup::get(), TrackingRegion::origin(), PV3DBase< T, PVType, FrameType >::perp(), and lumiQueryAPI::q.

{
  GlobalTrajectoryParameters kine;

  const TransientTrackingRecHit::ConstRecHitPointer& tth1 = hits[0];
  const TransientTrackingRecHit::ConstRecHitPointer& tth2 = hits[1];

  const GlobalPoint& vertexPos = region.origin();
  edm::ESHandle<MagneticField> bfield;
  es.get<IdealMagneticFieldRecord>().get(bfield);

  // Assume initial state is straight line passing through beam spot
  // with direction given by innermost two seed hits (with big uncertainty)
  GlobalVector initMomentum(tth2->globalPosition() - tth1->globalPosition());
  double rescale = 1000./initMomentum.perp();
  initMomentum *= rescale; // set to approximately infinite momentum
  TrackCharge q = 1; // irrelevant, since infinite momentum
  kine = GlobalTrajectoryParameters(vertexPos, initMomentum, q, &*bfield);

  return kine;
}