FastPixelHitMatcher Class Reference

#include <FastPixelHitMatcher.h>

Public Types
typedef TransientTrackingRecHit::ConstRecHitPointer	ConstRecHitPointer
typedef TransientTrackingRecHit::RecHitContainer	RecHitContainer
typedef TransientTrackingRecHit::RecHitPointer	RecHitPointer

Public Member Functions
bool	checkRZCompatibility (double zCluster, double rCluster, double zVertex, float rzMin, float rzMax, GlobalPoint &theHit, bool forward)
std::vector< std::pair < ConstRecHitPointer, ConstRecHitPointer > >	compatibleHits (const GlobalPoint &xmeas, const GlobalPoint &vprim, float energy, std::vector< TrackerRecHit > &theHits)
	FastPixelHitMatcher (float, float, float, float, float, float, float, float, float, float, float, float, bool)
double	getVertex ()
bool	isASeed (const ParticlePropagator &myElec, const ParticlePropagator &myPosi, const GlobalPoint &theVertex, double rCluster, double zCluster, const TrackerRecHit &hit1, const TrackerRecHit &hit2)
bool	propagateToLayer (ParticlePropagator &myPart, const GlobalPoint &theVertex, GlobalPoint &theHit, double phimin, double phimax, unsigned layer)
void	set1stLayer (float ephimin, float ephimax, float pphimin, float pphimax)
void	set1stLayerZRange (double zmin1, double zmax1)
void	set2ndLayer (float phimin, float phimax)
void	setES (const MagneticFieldMap *aFieldMap, const TrackerGeometry *aTrackerGeometry, const GeometricSearchTracker *geomSearchTracker, const TrackerInteractionGeometry *interactionGeometry)
double	zVertex (double zCluster, double rCluster, GlobalPoint &theHit)
virtual	~FastPixelHitMatcher ()

Private Attributes
const TrackerInteractionGeometry *	_theGeometry
float	ephi1max
float	ephi1min
RecHitContainer	hitsInTrack
float	phi2max
float	phi2min
float	pphi1max
float	pphi1min
float	r2maxF
float	r2minF
float	rMaxI
float	rMinI
bool	searchInTIDTEC
const MagneticFieldMap *	theFieldMap
const GeometricSearchTracker *	theGeomSearchTracker
const MagneticField *	theMagneticField
std::vector< const TrackerLayer * >	thePixelLayers
const TrackerGeometry *	theTrackerGeometry
double	vertex
float	z1max
float	z1min
float	z2maxB
float	z2minB

Detailed Description

Description: central class for finding compatible hits

Implementation: <Notes on="" implementation>="">

Description: Class to match an ECAL cluster to the pixel hits. Two compatible hits in the pixel layers are required.

Implementation: future redesign

Definition at line 38 of file FastPixelHitMatcher.h.

Member Typedef Documentation

typedef TransientTrackingRecHit::ConstRecHitPointer FastPixelHitMatcher::ConstRecHitPointer

Definition at line 42 of file FastPixelHitMatcher.h.

typedef TransientTrackingRecHit::RecHitContainer FastPixelHitMatcher::RecHitContainer

Definition at line 44 of file FastPixelHitMatcher.h.

typedef TransientTrackingRecHit::RecHitPointer FastPixelHitMatcher::RecHitPointer

Definition at line 43 of file FastPixelHitMatcher.h.

Constructor & Destructor Documentation

FastPixelHitMatcher::FastPixelHitMatcher	(	float	ephi1min,
		float	ephi1max,
		float	pphi1min,
		float	pphi1max,
		float	phi2min,
		float	phi2max,
		float	z2minB,
		float	z2maxB,
		float	r2minF,
		float	r2maxF,
		float	rMinI,
		float	rMaxI,
		bool	searchInTIDTEC
	)

Definition at line 30 of file FastPixelHitMatcher.cc.

                                          :
  ephi1min(ephi1min), ephi1max(ephi1max), 
  pphi1min(pphi1min), pphi1max(pphi1max), 
  phi2min(phi2min), phi2max(phi2max), 
  z2minB(z2minB), z2maxB(z2maxB), 
  r2minF(r2minF), r2maxF(r2maxF),
  rMinI(rMinI), rMaxI(rMaxI), 
  searchInTIDTEC(searchInTIDTEC),
  theTrackerGeometry(0),
  theMagneticField(0),
  theGeomSearchTracker(0),
  _theGeometry(0),
  thePixelLayers(50,static_cast<TrackerLayer*>(0)),
  vertex(0.) {}

FastPixelHitMatcher::~FastPixelHitMatcher ( )

virtual

Definition at line 51 of file FastPixelHitMatcher.cc.

{ }

Member Function Documentation

bool FastPixelHitMatcher::checkRZCompatibility	(	double	zCluster,
		double	rCluster,
		double	zVertex,
		float	rzMin,
		float	rzMax,
		GlobalPoint &	theHit,
		bool	forward
	)

Definition at line 321 of file FastPixelHitMatcher.cc.

References PV3DBase< T, PVType, FrameType >::perp(), PV3DBase< T, PVType, FrameType >::z(), and zVertex().

Referenced by isASeed().

{

  // The hit position
  double zHit = theHit.z();
  double rHit = theHit.perp();

  // Compute the intersection of a line joining the cluster position 
  // and the predicted z origin (zVertex) with the layer hit 
  // (returns R for a forward layer, and Z for a barrel layer)
  double checkRZ = forward ?
    (zHit-zVertex)/(zCluster-zVertex) * rCluster
    :
    zVertex + rHit * (zCluster-zVertex)/rCluster;

  // This value is then compared to check with the actual hit position 
  // (in R for a forward layer, in Z for a barrel layer)

  return forward ?
    checkRZ+rzMin < rHit && rHit < checkRZ+rzMax 
    :
    checkRZ+rzMin < zHit && zHit < checkRZ+rzMax;
    
}

std::vector< std::pair< FastPixelHitMatcher::ConstRecHitPointer, FastPixelHitMatcher::ConstRecHitPointer > > FastPixelHitMatcher::compatibleHits	(	const GlobalPoint &	xmeas,
		const GlobalPoint &	vprim,
		float	energy,
		std::vector< TrackerRecHit > &	theHits
	)

Definition at line 81 of file FastPixelHitMatcher.cc.

References GenericTransientTrackingRecHit::build(), gather_cfg::cout, isASeed(), PV3DBase< T, PVType, FrameType >::mag(), PV3DBase< T, PVType, FrameType >::perp(), ParticlePropagator::propagateToNominalVertex(), query::result, theFieldMap, PV3DBase< T, PVType, FrameType >::x(), PV3DBase< T, PVType, FrameType >::y(), and PV3DBase< T, PVType, FrameType >::z().

Referenced by FastElectronSeedGenerator::addASeedToThisCluster().

                                                     { 
  
  std::vector< std::pair<FastPixelHitMatcher::ConstRecHitPointer, 
    FastPixelHitMatcher::ConstRecHitPointer> > result;
#ifdef FAMOS_DEBUG
  std::cout << "[FastPixelHitMatcher::compatibleHits] entering .. " << std::endl;
#endif
  
  double zCluster = thePos.z();
  double rCluster = thePos.perp();
  
  // The cluster inferred energy-momentum
  double theLength = thePos.mag();
  XYZTLorentzVector theMom(thePos.x(), thePos.y(), thePos.z(), theLength);
  theMom *= energy / theLength;
  XYZTLorentzVector theVert(thePos.x(),thePos.y(),thePos.z(),0.);
  XYZTLorentzVector theNominalVertex(theVertex.x(), theVertex.y(), theVertex.z(), 0.);
  
  // The corresponding RawParticles (to be propagated for e- and e+
  ParticlePropagator myElec(theMom,theVert,-1.,theFieldMap);
  ParticlePropagator myPosi(theMom,theVert,+1.,theFieldMap); 
#ifdef FAMOS_DEBUG
  std::cout << "elec/posi before propagation " << std::endl << myElec << std::endl << myPosi << std::endl;
#endif
  
  // Propagate the e- and the e+ hypothesis to the nominal vertex
  // by modifying the pT direction in an appropriate manner.
  myElec.propagateToNominalVertex(theNominalVertex);
  myPosi.propagateToNominalVertex(theNominalVertex);
#ifdef FAMOS_DEBUG
  std::cout << "elec/posi after propagation " << std::endl << myElec << std::endl << myPosi << std::endl;
#endif
  
  // Look for an appropriate see in the pixel detector
  bool thereIsASeed = false;
  unsigned nHits = theHits.size();
  
  for ( unsigned firstHit=0; firstHit<nHits-1; ++firstHit ) { 
    for ( unsigned secondHit=firstHit+1; secondHit<nHits; ++secondHit ) {      

      // Is there a seed associated to this pair of Pixel hits?
      thereIsASeed = isASeed(myElec,myPosi,theVertex,
                 rCluster,zCluster,
                 theHits[firstHit],
                 theHits[secondHit]);

#ifdef FAMOS_DEBUG
      std::cout << "Is there a seed with hits " << firstHit << " & "<< secondHit << "? " << thereIsASeed << std::endl;
#endif
      if ( !thereIsASeed ) continue;
      
      ConstRecHitPointer theFirstHit = 
    GenericTransientTrackingRecHit::build(theHits[firstHit].geomDet(),
                          theHits[firstHit].hit());
      ConstRecHitPointer theSecondHit = 
    GenericTransientTrackingRecHit::build(theHits[secondHit].geomDet(),
                          theHits[secondHit].hit());
      result.push_back(std::pair<
               FastPixelHitMatcher::ConstRecHitPointer,
               FastPixelHitMatcher::ConstRecHitPointer>(theFirstHit,theSecondHit));
      
    }
  }
  
  return result;
}

double FastPixelHitMatcher::getVertex ( )

inline

Definition at line 62 of file FastPixelHitMatcher.h.

References vertex.

Referenced by FastElectronSeedGenerator::addASeedToThisCluster().

{ return vertex; }

bool FastPixelHitMatcher::isASeed	(	const ParticlePropagator &	myElec,
		const ParticlePropagator &	myPosi,
		const GlobalPoint &	theVertex,
		double	rCluster,
		double	zCluster,
		const TrackerRecHit &	hit1,
		const TrackerRecHit &	hit2
	)

Definition at line 151 of file FastPixelHitMatcher.cc.

References checkRZCompatibility(), gather_cfg::cout, TrackerRecHit::cylinderNumber(), ephi1max, ephi1min, TrackerRecHit::globalPosition(), TrackerRecHit::isOnTheSameLayer(), phi2max, phi2min, pphi1max, pphi1min, propagateToLayer(), r2maxF, r2minF, rMaxI, rMinI, TrackerRecHit::subDetId(), vertex, z1max, z1min, z2maxB, z2minB, and zVertex().

Referenced by compatibleHits().

                                           {
  
  // Check that the two hits are not on the same layer
  if ( hit2.isOnTheSameLayer(hit1) ) return false;
#ifdef FAMOS_DEBUG
  std::cout << "isASeed: The two hits are not on the same layer - OK " << std::endl;
#endif

  // Check that the first hit is on PXB or PXD
  if ( hit1.subDetId() > 2 ) return false;
#ifdef FAMOS_DEBUG
  std::cout << "isASeed: The first hits is on the pixel detector " << std::endl;
#endif

  // Impose the track to originate from zVertex = 0. and check the 
  // compatibility with the first hit (beam spot constraint)
  GlobalPoint firstHit = hit1.globalPosition();
  bool rzok = checkRZCompatibility(zCluster, rCluster, 0., z1min, z1max, firstHit, hit1.subDetId()>1);
#ifdef FAMOS_DEBUG
  std::cout << "isASeed: rzok (1) = " << rzok << std::endl;
#endif
  if ( !rzok ) return false;
  
  // Refine the Z vertex by imposing the track to pass through the first RecHit, 
  // and check the compatibility with the second rechit 
  GlobalPoint secondHit = hit2.globalPosition(); 
  rzok = false;

  // The orgin Z vertex for thet track passing through the first rechit
  vertex = zVertex(zCluster, rCluster, firstHit);

  // Compute R (forward) or Z (barrel) predicted for the second hit and check compatibility
  if ( hit2.subDetId() == 1 ) {
    rzok = checkRZCompatibility(zCluster, rCluster, vertex, z2minB, z2maxB, secondHit, false);
  } else if ( hit2.subDetId() == 2 ) {  
    rzok = checkRZCompatibility(zCluster, rCluster, vertex, r2minF, r2maxF, secondHit, true);
  } else { 
    rzok = checkRZCompatibility(zCluster, rCluster, vertex, rMinI, rMaxI, secondHit, true);
  }
#ifdef FAMOS_DEBUG
  std::cout << "isASeed: rzok (2) = " << rzok << std::endl;
#endif
  if ( !rzok ) return false;

  // Propagate the inferred electron (positron) to the first layer,
  // check the compatibility with the first hit, and propagate back
  // to the nominal vertex with the hit constraint
  ParticlePropagator elec(myElec);
  ParticlePropagator posi(myPosi);
#ifdef FAMOS_DEBUG
  std::cout << "isASeed: elec1 to be propagated to first layer" << std::endl;
#endif
  bool elec1 = propagateToLayer(elec,theVertex,firstHit,
                ephi1min,ephi1max,hit1.cylinderNumber());
#ifdef FAMOS_DEBUG
  std::cout << "isASeed: posi1 to be propagated to first layer" << std::endl;
#endif
  bool posi1 = propagateToLayer(posi,theVertex,firstHit,
                pphi1min,pphi1max,hit1.cylinderNumber());

#ifdef FAMOS_DEBUG
  std::cout << "isASeed: elec1 / posi1 " << elec1 << " " << posi1 << std::endl;
#endif
  // Neither the electron not the positron hypothesis work...
  if ( !elec1 && !posi1 ) return false;
  
  // Otherwise, propagate to the second layer, check the compatibility
  // with the second hit and propagate back to the nominal vertex with 
  // the hit constraint
#ifdef FAMOS_DEBUG
  std::cout << "isASeed: elec2 to be propagated to second layer" << std::endl;
#endif
  bool elec2 = elec1 && propagateToLayer(elec,theVertex,secondHit,
                     phi2min,phi2max,hit2.cylinderNumber());
  
#ifdef FAMOS_DEBUG
  std::cout << "isASeed: posi2 to be propagated to second layer" << std::endl;
#endif
  bool posi2 = posi1 && propagateToLayer(posi,theVertex,secondHit,
                     phi2min,phi2max,hit2.cylinderNumber());
  
#ifdef FAMOS_DEBUG
  std::cout << "isASeed: elec2 / posi2 " << elec2 << " " << posi2 << std::endl;
#endif
  if ( !elec2 && !posi2 ) return false;

  return true;

}

bool FastPixelHitMatcher::propagateToLayer	(	ParticlePropagator &	myPart,
		const GlobalPoint &	theVertex,
		GlobalPoint &	theHit,
		double	phimin,
		double	phimax,
		unsigned	layer
	)

Definition at line 248 of file FastPixelHitMatcher.cc.

References gather_cfg::cout, M_PI, PV3DBase< T, PVType, FrameType >::perp(), PV3DBase< T, PVType, FrameType >::phi(), BaseParticlePropagator::propagate(), ParticlePropagator::propagateToNominalVertex(), BaseParticlePropagator::setPropagationConditions(), RawParticle::setVertex(), summarizeEdmComparisonLogfiles::success, thePixelLayers, vertex, RawParticle::vertex(), PV3DBase< T, PVType, FrameType >::x(), PV3DBase< T, PVType, FrameType >::y(), and PV3DBase< T, PVType, FrameType >::z().

Referenced by isASeed().

                                    {

  // Set the z position of the particle to the predicted one
  XYZTLorentzVector theNominalVertex(theVertex.x(), theVertex.y(), vertex, 0.);
  myPart.setVertex(theNominalVertex);
#ifdef FAMOS_DEBUG
  std::cout << "propagateToLayer: propagateToLayer: Before propagation (0) " << myPart << std::endl;
#endif

  // Propagate the inferred electron (positron) to the first layer
  // Use the radius (barrel) or the z (forward) of the hit instead 
  // of the inaccurate layer radius and z.
  double rCyl = thePixelLayers[layer]->forward() ? 999. : theHit.perp();
  double zCyl = thePixelLayers[layer]->forward() ? fabs(theHit.z()) : 999.;
  BaseParticlePropagator* myBasePart = (BaseParticlePropagator*)(&myPart);
  myBasePart->setPropagationConditions(rCyl,zCyl);
  // myPart.setPropagationConditions(*(thePixelLayers[layer]));

  // bool success = myPart.propagateToBoundSurface(*(thePixelLayers[layer]));
  bool success = myPart.propagate();
#ifdef FAMOS_DEBUG
  std::cout << "propagateToLayer: Success ? " << success << std::endl;
  std::cout << "propagateToLayer: After  propagation (1) " << myPart << std::endl;
  std::cout << "propagateToLayer: The hit               " << theHit << std::endl; 
#endif
      
  // Check that propagated particle is within the proper phi range.
  if ( success ) {
    double dphi = myPart.vertex().phi() - theHit.phi();
    if ( dphi < -M_PI ) 
      dphi = dphi + 2.*M_PI;
    else if ( dphi > M_PI ) 
      dphi = dphi - 2.*M_PI;
#ifdef FAMOS_DEBUG
    std::cout << "propagateToLayer: Phi range ? " << phimin << " < " << dphi << " < " << phimax << std::endl; 
#endif
    if ( dphi < phimin || dphi > phimax ) success = false;
  }
      
  // Impose the track to go through the hit and propagate back to 
  // the nominal vertex
  if ( success ) {
    myPart.setVertex( XYZTLorentzVector(theHit.x(), theHit.y(), theHit.z(), 0.) );
    myPart.propagateToNominalVertex(theNominalVertex);
#ifdef FAMOS_DEBUG
    std::cout << "propagateToLayer: After  propagation (2) " << myPart << std::endl;
#endif
  }

  return success;

}

void FastPixelHitMatcher::set1stLayer ( float  ephimin, float  ephimax, float  pphimin, float  pphimax  )

inline

Definition at line 64 of file FastPixelHitMatcher.h.

References ephi1max, ephi1min, pphi1max, and pphi1min.

Referenced by FastElectronSeedGenerator::addASeedToThisCluster().

                                          {

    ephi1min = ephimin;
    ephi1max = ephimax;
    pphi1min = pphimin;
    pphi1max = pphimax;

  }

void FastPixelHitMatcher::set1stLayerZRange ( double  zmin1, double  zmax1  )

inline

Definition at line 105 of file FastPixelHitMatcher.h.

References z1max, and z1min.

Referenced by FastElectronSeedGenerator::run().

                                                     {
    z1max = zmax1;
    z1min = zmin1;
  }

void FastPixelHitMatcher::set2ndLayer ( float  phimin, float  phimax  )

inline

Definition at line 74 of file FastPixelHitMatcher.h.

References phi2max, phi2min, phimax, and phimin.

Referenced by FastElectronSeedGenerator::addASeedToThisCluster().

                                                {
    phi2min = phimin;
    phi2max = phimax;
  }

void FastPixelHitMatcher::setES	(	const MagneticFieldMap *	aFieldMap,
		const TrackerGeometry *	aTrackerGeometry,
		const GeometricSearchTracker *	geomSearchTracker,
		const TrackerInteractionGeometry *	interactionGeometry
	)

Definition at line 54 of file FastPixelHitMatcher.cc.

References _theGeometry, TrackerInteractionGeometry::cylinderBegin(), TrackerInteractionGeometry::cylinderEnd(), theFieldMap, theGeomSearchTracker, thePixelLayers, and theTrackerGeometry.

Referenced by FastElectronSeedGenerator::setupES().

                                                                    {
  
  // initialize the tracker geometry and the magnetic field map
  theTrackerGeometry = aTrackerGeometry; 
  //theMagneticField = aMagField;
  theGeomSearchTracker = geomSearchTracker;
  _theGeometry = interactionGeometry;
  theFieldMap = aFieldMap;
  
  // Initialize (if not already done) the simplified magnetic field geometry
  // MagneticFieldMap::instance( theMagneticField, _theGeometry );
  
  // The pixel layers in the simplified geometry 
  unsigned layer = 1;
  std::list<TrackerLayer>::const_iterator cyliter = _theGeometry->cylinderBegin();
  for ( ; cyliter != _theGeometry->cylinderEnd() ; ++cyliter ) {
    if ( layer != cyliter->layerNumber() ) continue;
    thePixelLayers[layer++] = &(*cyliter);
  }
  
}

double FastPixelHitMatcher::zVertex	(	double	zCluster,
		double	rCluster,
		GlobalPoint &	theHit
	)

Definition at line 307 of file FastPixelHitMatcher.cc.

References PV3DBase< T, PVType, FrameType >::perp(), and PV3DBase< T, PVType, FrameType >::z().

Referenced by checkRZCompatibility(), and isASeed().

{

  // Refine the Z vertex by imposing the track to pass through the RecHit
  double pxHitz = theHit.z();
  double pxHitr = theHit.perp();
  return pxHitz - pxHitr*(zCluster-pxHitz)/(rCluster-pxHitr);

}

Member Data Documentation

const TrackerInteractionGeometry* FastPixelHitMatcher::_theGeometry

private

Definition at line 126 of file FastPixelHitMatcher.h.

Referenced by setES().

float FastPixelHitMatcher::ephi1max

private

Definition at line 114 of file FastPixelHitMatcher.h.

Referenced by isASeed(), and set1stLayer().

float FastPixelHitMatcher::ephi1min

private

Definition at line 114 of file FastPixelHitMatcher.h.

Referenced by isASeed(), and set1stLayer().

RecHitContainer FastPixelHitMatcher::hitsInTrack

private

Definition at line 112 of file FastPixelHitMatcher.h.

float FastPixelHitMatcher::phi2max

private

Definition at line 116 of file FastPixelHitMatcher.h.

Referenced by isASeed(), and set2ndLayer().

float FastPixelHitMatcher::phi2min

private

Definition at line 116 of file FastPixelHitMatcher.h.

Referenced by isASeed(), and set2ndLayer().

float FastPixelHitMatcher::pphi1max

private

Definition at line 115 of file FastPixelHitMatcher.h.

Referenced by isASeed(), and set1stLayer().

float FastPixelHitMatcher::pphi1min

private

Definition at line 115 of file FastPixelHitMatcher.h.

Referenced by isASeed(), and set1stLayer().

float FastPixelHitMatcher::r2maxF

private

Definition at line 119 of file FastPixelHitMatcher.h.

Referenced by isASeed().

float FastPixelHitMatcher::r2minF

private

Definition at line 119 of file FastPixelHitMatcher.h.

Referenced by isASeed().

float FastPixelHitMatcher::rMaxI

private

Definition at line 120 of file FastPixelHitMatcher.h.

Referenced by isASeed().

float FastPixelHitMatcher::rMinI

private

Definition at line 120 of file FastPixelHitMatcher.h.

Referenced by isASeed().

bool FastPixelHitMatcher::searchInTIDTEC

private

Definition at line 121 of file FastPixelHitMatcher.h.

const MagneticFieldMap* FastPixelHitMatcher::theFieldMap

private

Definition at line 127 of file FastPixelHitMatcher.h.

Referenced by compatibleHits(), and setES().

const GeometricSearchTracker* FastPixelHitMatcher::theGeomSearchTracker

private

Definition at line 125 of file FastPixelHitMatcher.h.

Referenced by setES().

const MagneticField* FastPixelHitMatcher::theMagneticField

private

Definition at line 124 of file FastPixelHitMatcher.h.

std::vector<const TrackerLayer*> FastPixelHitMatcher::thePixelLayers

private

Definition at line 128 of file FastPixelHitMatcher.h.

Referenced by propagateToLayer(), and setES().

const TrackerGeometry* FastPixelHitMatcher::theTrackerGeometry

private

Definition at line 123 of file FastPixelHitMatcher.h.

Referenced by setES().

double FastPixelHitMatcher::vertex

private

Definition at line 129 of file FastPixelHitMatcher.h.

Referenced by Tau.Tau::dxy(), Tau.Tau::dz(), getVertex(), isASeed(), and propagateToLayer().

float FastPixelHitMatcher::z1max

private

Definition at line 117 of file FastPixelHitMatcher.h.

Referenced by isASeed(), and set1stLayerZRange().

float FastPixelHitMatcher::z1min

private

Definition at line 117 of file FastPixelHitMatcher.h.

Referenced by isASeed(), and set1stLayerZRange().

float FastPixelHitMatcher::z2maxB

private

Definition at line 118 of file FastPixelHitMatcher.h.

Referenced by isASeed().

float FastPixelHitMatcher::z2minB

private

Definition at line 118 of file FastPixelHitMatcher.h.

Referenced by isASeed().