#include <MuonSeedFromRecHits.h>

Inheritance diagram for MuonSeedFromRecHits:

Public Member Functions
void	add (MuonTransientTrackingRecHit::MuonRecHitPointer hit)
void	clear ()
TrajectorySeed	createSeed (float ptmean, float sptmean, MuonTransientTrackingRecHit::ConstMuonRecHitPointer last) const
MuonTransientTrackingRecHit::ConstMuonRecHitPointer	firstRecHit () const
	MuonSeedFromRecHits ()
unsigned int	nrhit () const
void	setBField (const MagneticField *field)
void	setPtExtractor (const MuonSeedPtExtractor *extractor)
virtual	~MuonSeedFromRecHits ()
Protected Types
typedef MuonTransientTrackingRecHit::ConstMuonRecHitPointer	ConstMuonRecHitPointer
typedef MuonTransientTrackingRecHit::MuonRecHitContainer	MuonRecHitContainer
typedef MuonTransientTrackingRecHit::MuonRecHitPointer	MuonRecHitPointer
Protected Attributes
const MagneticField *	theField
const MuonSeedPtExtractor *	thePtExtractor
MuonTransientTrackingRecHit::MuonRecHitContainer	theRhits

Detailed Description

Author:: A. Vitelli - INFN Torino; porting R.Bellan - INFN Torino

Generate a seed starting from a list of RecHits

Definition at line 19 of file MuonSeedFromRecHits.h.

Member Typedef Documentation

typedef MuonTransientTrackingRecHit::ConstMuonRecHitPointer MuonSeedFromRecHits::ConstMuonRecHitPointer [protected]

Definition at line 39 of file MuonSeedFromRecHits.h.

typedef MuonTransientTrackingRecHit::MuonRecHitContainer MuonSeedFromRecHits::MuonRecHitContainer [protected]

Definition at line 37 of file MuonSeedFromRecHits.h.

typedef MuonTransientTrackingRecHit::MuonRecHitPointer MuonSeedFromRecHits::MuonRecHitPointer [protected]

Definition at line 38 of file MuonSeedFromRecHits.h.

Constructor & Destructor Documentation

MuonSeedFromRecHits::MuonSeedFromRecHits ( )

Definition at line 35 of file MuonSeedFromRecHits.cc.

: theField(0)
{
}

virtual MuonSeedFromRecHits::~MuonSeedFromRecHits ( ) [inline, virtual]

Definition at line 23 of file MuonSeedFromRecHits.h.

{}

Member Function Documentation

void MuonSeedFromRecHits::add ( MuonTransientTrackingRecHit::MuonRecHitPointer hit ) [inline]

Definition at line 28 of file MuonSeedFromRecHits.h.

References theRhits.

Referenced by MuonSeedFinder::seeds().

{ theRhits.push_back(hit); }

void MuonSeedFromRecHits::clear ( void ) [inline]

Definition at line 31 of file MuonSeedFromRecHits.h.

References theRhits.

Referenced by MuonSeedFinder::seeds().

{theRhits.clear();}

TrajectorySeed MuonSeedFromRecHits::createSeed	(	float	ptmean,
		float	sptmean,
		MuonTransientTrackingRecHit::ConstMuonRecHitPointer	last
	)		const

Definition at line 41 of file MuonSeedFromRecHits.cc.

References alongMomentum, DeDxDiscriminatorTools::charge(), clone(), debug, error, prof2calltree::l, metname, PV3DBase< T, PVType, FrameType >::perp(), trajectoryStateTransform::persistentState(), edm::OwnVector< T, P >::push_back(), funct::sqr(), lumiQTWidget::t, theField, theRhits, and PV3DBase< T, PVType, FrameType >::theta().

Referenced by MuonCSCSeedFromRecHits::createDefaultEndcapSeed(), MuonCSCSeedFromRecHits::makeSeed(), MuonOverlapSeedFromRecHits::makeSeed(), MuonDTSeedFromRecHits::seed(), and ExhaustiveMuonTrajectoryBuilder::trajectories().

{
  
  const std::string metname = "Muon|RecoMuon|MuonSeedFromRecHits";

  MuonPatternRecoDumper debug;

  // FIXME: put it into a parameter set!
  double theMinMomentum = 3.0;
 
  // Minimal pt
  if ( fabs(ptmean) < theMinMomentum ) ptmean = theMinMomentum * ptmean/fabs(ptmean) ;

  AlgebraicVector t(4);
  AlgebraicSymMatrix mat(5,0) ;

  // Fill the LocalTrajectoryParameters
  LocalPoint segPos=last->localPosition();
  GlobalVector mom=last->globalPosition()-GlobalPoint();
  GlobalVector polar(GlobalVector::Spherical(mom.theta(),
                                             last->globalDirection().phi(),
                                             1.));
  polar *=fabs(ptmean)/polar.perp();
  LocalVector segDirFromPos=last->det()->toLocal(polar);
  int charge=(int)(ptmean/fabs(ptmean));

  LocalTrajectoryParameters param(segPos,segDirFromPos, charge);

  // this perform H.T() * parErr * H, which is the projection of the 
  // the measurement error (rechit rf) to the state error (TSOS rf)
  // Legenda:
  // H => is the 4x5 projection matrix
  // parError the 4x4 parameter error matrix of the RecHit

  // LogTrace(metname) << "Projection matrix:\n" << last->projectionMatrix();
  // LogTrace(metname) << "Error matrix:\n" << last->parametersError();

  mat = last->parametersError().similarityT( last->projectionMatrix() );
  

  float p_err = sqr(sptmean/(ptmean*ptmean));
  mat[0][0]= p_err;
  

  LocalTrajectoryError error(asSMatrix<5>(mat));
  
  // Create the TrajectoryStateOnSurface
  TrajectoryStateOnSurface tsos(param, error, last->det()->surface(), theField);

  // The following LogTraces must be moved somewhere else (StandAloneTrajectoryBuilder)
  // Here the TSOS does not have the magnetic field set, so dumpTSOS causes a crash
  // (when LogTrace/LogDebug is activated)
  //LogTrace(metname) << "Trajectory State on Surface before the extrapolation"<<endl;
  //LogTrace(metname) << debug.dumpTSOS(tsos);
  
  // Take the DetLayer on which relies the rechit
  DetId id = last->geographicalId();
  // Segment layer
  //LogTrace(metname) << "The RecSegment relies on: "<<endl;
  //LogTrace(metname) << debug.dumpMuonId(id);
  //LogTrace(metname) << debug.dumpTSOS(tsos);

  // Transform it in a TrajectoryStateOnSurface
  
  
  PTrajectoryStateOnDet const & seedTSOS =
    trajectoryStateTransform::persistentState( tsos ,id.rawId());
  
  edm::OwnVector<TrackingRecHit> container;
  for (unsigned l=0; l<theRhits.size(); l++) {
      container.push_back( theRhits[l]->hit()->clone() );
  }

  TrajectorySeed theSeed(seedTSOS,container,alongMomentum);
   
  return theSeed;
}