reco::PFTrack Class Reference

Base class for particle flow input reconstructed tracks and simulated particles. More...

#include <PFTrack.h>

Inheritance diagram for reco::PFTrack:

Public Member Functions
void	addPoint (const reco::PFTrajectoryPoint &trajPt)
double	charge () const
const reco::PFTrajectoryPoint &	extrapolatedPoint (unsigned layerid) const
std::vector< reco::PFTrajectoryPoint >::const_iterator	innermostMeasurement () const
	iterator on innermost tracker measurement More...
unsigned int	nTrajectoryMeasurements () const
unsigned int	nTrajectoryPoints () const
std::vector< reco::PFTrajectoryPoint >::const_iterator	outermostMeasurement () const
	iterator on outermost tracker measurement More...
	PFTrack ()
	PFTrack (double charge)
	PFTrack (const PFTrack &other)
void	setPoint (unsigned int index, const reco::PFTrajectoryPoint &measurement)
	set a trajectory point More...
const reco::PFTrajectoryPoint &	trajectoryPoint (unsigned index) const
const std::vector< reco::PFTrajectoryPoint > &	trajectoryPoints () const

Protected Attributes
double	charge_
	charge More...
unsigned int	indexInnermost_
	index innermost tracker measurement More...
unsigned int	indexOutermost_
	index outermost tracker measurement More...
std::vector< reco::PFTrajectoryPoint >	trajectoryPoints_
	vector of trajectory points More...

Static Protected Attributes
static const unsigned int	nMaxTrackingLayers_ = 17
	maximal number of tracking layers More...

Detailed Description

Base class for particle flow input reconstructed tracks and simulated particles.

A PFTrack contains a vector of PFTrajectoryPoint objects. These points are stored in a vector to benefit from the random access. One must take care of storing the points in the right order, and it might even be necessary to insert dummy points.

For a PFRecTrack, the ordering of the points is the following:

• point 1: Closest approach
• point 2: Beam Pipe
• point 3 to n: Trajectory measurements (from the tracker layers)
• point n+1: Preshower Layer 1, or dummy point if not in the preshower zone
• point n+2: Preshower Layer 2, or dummy point if not in the preshower zone
• point n+3: ECAL Entrance
• point n+4: ECAL expected position of the shower maximum, assuming the track is an electron track.
• point n+5: HCAL Entrance

For a PFSimParticle, the ordering of the points is the following.

• If the particle decays before ECAL:
• point 1: start point
• point 2: end point
• If the particle does not decay before ECAL:
• point 1: start point
• point 2: PS1 or dummy
• point 3: PS2 or dummy
• point 4: ECAL entrance
• point 5: HCAL entrance

PFRecTracks and PFSimParticles are created in the PFTrackProducer module.

Author

Renaud Bruneliere

Date

July 2006

Definition at line 63 of file PFTrack.h.

Constructor & Destructor Documentation

PFTrack() [1/3]

PFTrack::PFTrack

(

)

Definition at line 12 of file PFTrack.cc.

References reco::PFTrajectoryPoint::NLayers, nMaxTrackingLayers_, and trajectoryPoints_.

                 : charge_(0.), indexInnermost_(0), indexOutermost_(0) {
  // prepare vector of trajectory points for propagated positions
  trajectoryPoints_.reserve(PFTrajectoryPoint::NLayers + nMaxTrackingLayers_);
}

PFTrack() [2/3]

PFTrack::PFTrack

(

double

charge

)

Definition at line 17 of file PFTrack.cc.

References reco::PFTrajectoryPoint::NLayers, nMaxTrackingLayers_, and trajectoryPoints_.

                              : charge_(charge), indexInnermost_(0), indexOutermost_(0) {
  // prepare vector of trajectory points for propagated positions
  trajectoryPoints_.reserve(PFTrajectoryPoint::NLayers + nMaxTrackingLayers_);
}

PFTrack() [3/3]

PFTrack::PFTrack

(

const PFTrack &

other

)

Definition at line 22 of file PFTrack.cc.

    : charge_(other.charge_),
      trajectoryPoints_(other.trajectoryPoints_),
      indexInnermost_(other.indexInnermost_),
      indexOutermost_(other.indexOutermost_) {}

Member Function Documentation

addPoint()

void PFTrack::addPoint

(

const reco::PFTrajectoryPoint &

trajPt

)

add a trajectory measurement

Definition at line 28 of file PFTrack.cc.

References reco::PFTrajectoryPoint::BeamPipeOrEndVertex, indexInnermost_, indexOutermost_, reco::PFTrajectoryPoint::isTrackerLayer(), and trajectoryPoints_.

Referenced by PFTrackTransformer::addPoints(), and PFTrackTransformer::addPointsAndBrems().

                                                      {
  if (trajPt.isTrackerLayer()) {
    if (!indexOutermost_) {  // first time a measurement is added
      if (trajectoryPoints_.size() < PFTrajectoryPoint::BeamPipeOrEndVertex + 1) {
        PFTrajectoryPoint dummyPt;
        for (unsigned iPt = trajectoryPoints_.size(); iPt < PFTrajectoryPoint::BeamPipeOrEndVertex + 1; iPt++)
          trajectoryPoints_.push_back(dummyPt);
      } else if (trajectoryPoints_.size() > PFTrajectoryPoint::BeamPipeOrEndVertex + 1) {
        edm::LogWarning("PFTrack") << "trajectoryPoints_.size() is too large = " << trajectoryPoints_.size();
      }
      indexOutermost_ = indexInnermost_ = PFTrajectoryPoint::BeamPipeOrEndVertex + 1;
    } else
      indexOutermost_++;
  }
  // Use push_back instead of insert in order to gain time
  trajectoryPoints_.push_back(trajPt);
}

charge()

double reco::PFTrack::charge ( ) const

inline

Returns

electric charge

Definition at line 81 of file PFTrack.h.

References charge_.

{ return charge_; }

extrapolatedPoint()

const reco::PFTrajectoryPoint & PFTrack::extrapolatedPoint

(

unsigned

layerid

)

const

Returns

an extrapolated point

Definition at line 46 of file PFTrack.cc.

References Exception, indexInnermost_, reco::PFTrajectoryPoint::NLayers, nTrajectoryMeasurements(), and trajectoryPoints_.

Referenced by PFElecTkProducer::isSharingEcalEnergyWithEgSC(), and ConvBremPFTrackFinder::runConvBremFinder().

                                                                              {
  const unsigned offset_layerid = nTrajectoryMeasurements() + layerid;
  if (layerid >= reco::PFTrajectoryPoint::NLayers || offset_layerid >= trajectoryPoints_.size()) {
    throw cms::Exception("SizeError") << "PFRecTrack::extrapolatedPoint: cannot access " << layerid
                                      << " #traj meas = " << nTrajectoryMeasurements()
                                      << " #traj points = " << trajectoryPoints_.size() << endl
                                      << (*this);
  }
  if (layerid < indexInnermost_)
    return trajectoryPoints_[layerid];
  else
    return trajectoryPoints_[offset_layerid];
}

innermostMeasurement()

std::vector<reco::PFTrajectoryPoint>::const_iterator reco::PFTrack::innermostMeasurement ( ) const

inline

iterator on innermost tracker measurement

Definition at line 102 of file PFTrack.h.

References indexInnermost_, and trajectoryPoints_.

                                                                                {
      return trajectoryPoints_.begin() + indexInnermost_;
    }

nTrajectoryMeasurements()

unsigned int reco::PFTrack::nTrajectoryMeasurements ( ) const

inline

Returns

number of trajectory measurements in tracker

Definition at line 87 of file PFTrack.h.

References indexInnermost_, and indexOutermost_.

Referenced by extrapolatedPoint().

                                                 {
      return (indexOutermost_ ? indexOutermost_ - indexInnermost_ + 1 : 0);
    }

nTrajectoryPoints()

unsigned int reco::PFTrack::nTrajectoryPoints ( ) const

inline

Returns

number of trajectory points

Definition at line 84 of file PFTrack.h.

References trajectoryPoints_.

{ return trajectoryPoints_.size(); }

outermostMeasurement()

std::vector<reco::PFTrajectoryPoint>::const_iterator reco::PFTrack::outermostMeasurement ( ) const

inline

iterator on outermost tracker measurement

Definition at line 107 of file PFTrack.h.

References indexOutermost_, and trajectoryPoints_.

                                                                                {
      return trajectoryPoints_.begin() + indexOutermost_;
    }

setPoint()

void reco::PFTrack::setPoint ( unsigned int  index, const reco::PFTrajectoryPoint &  measurement  )

inline

set a trajectory point

Definition at line 76 of file PFTrack.h.

References trajectoryPoints_.

                                                                                {
      trajectoryPoints_[index] = measurement;
    }

trajectoryPoint()

const reco::PFTrajectoryPoint& reco::PFTrack::trajectoryPoint ( unsigned  index ) const

inline

Returns

a trajectory point

Definition at line 95 of file PFTrack.h.

References trajectoryPoints_.

{ return trajectoryPoints_[index]; }

trajectoryPoints()

const std::vector<reco::PFTrajectoryPoint>& reco::PFTrack::trajectoryPoints ( ) const

inline

Returns

vector of trajectory points

Definition at line 92 of file PFTrack.h.

References trajectoryPoints_.

{ return trajectoryPoints_; }

Member Data Documentation

charge_

double reco::PFTrack::charge_

protected

charge

Definition at line 116 of file PFTrack.h.

Referenced by charge().

indexInnermost_

unsigned int reco::PFTrack::indexInnermost_

protected

index innermost tracker measurement

Definition at line 122 of file PFTrack.h.

Referenced by addPoint(), extrapolatedPoint(), innermostMeasurement(), and nTrajectoryMeasurements().

indexOutermost_

unsigned int reco::PFTrack::indexOutermost_

protected

index outermost tracker measurement

Definition at line 125 of file PFTrack.h.

Referenced by addPoint(), nTrajectoryMeasurements(), and outermostMeasurement().

nMaxTrackingLayers_

const unsigned PFTrack::nMaxTrackingLayers_ = 17

staticprotected

maximal number of tracking layers

Definition at line 113 of file PFTrack.h.

Referenced by PFTrack().

trajectoryPoints_

std::vector<reco::PFTrajectoryPoint> reco::PFTrack::trajectoryPoints_

protected

vector of trajectory points

Definition at line 119 of file PFTrack.h.

Referenced by addPoint(), extrapolatedPoint(), innermostMeasurement(), nTrajectoryPoints(), outermostMeasurement(), PFTrack(), setPoint(), trajectoryPoint(), and trajectoryPoints().