PositionAtECalEntranceComputer Class Reference

#include <PositionAtECalEntranceComputer.h>

Public Member Functions
void	beginEvent (const edm::EventSetup &)
reco::Candidate::Point	operator() (const reco::Candidate *particle, bool &success) const
	PositionAtECalEntranceComputer ()
	~PositionAtECalEntranceComputer ()

Private Attributes
double	bField_z_

Detailed Description

Extrapolate particle (charged or neutral) to ECAL entrance, in order to compute the distance of the tau to ECAL cracks and/or dead ECAL channels

Authors

Fabio Colombo, Christian Veelken

Definition at line 19 of file PositionAtECalEntranceComputer.h.

Constructor & Destructor Documentation

PositionAtECalEntranceComputer::PositionAtECalEntranceComputer

(

)

Definition at line 9 of file PositionAtECalEntranceComputer.cc.

: bField_z_(-1.) {}

PositionAtECalEntranceComputer::~PositionAtECalEntranceComputer

(

)

Definition at line 11 of file PositionAtECalEntranceComputer.cc.

{}

Member Function Documentation

void PositionAtECalEntranceComputer::beginEvent

(

const edm::EventSetup &

es

)

Definition at line 13 of file PositionAtECalEntranceComputer.cc.

References ecalTB2006H4_GenSimDigiReco_cfg::bField, bField_z_, edm::EventSetup::get(), MagneticField::inTesla(), and PV3DBase< T, PVType, FrameType >::z().

Referenced by AntiElectronDeadECAL::beginEvent(), and AntiElectronIDMVA6::beginEvent().

                                                                       {
  edm::ESHandle<MagneticField> bField;
  es.get<IdealMagneticFieldRecord>().get(bField);
  bField_z_ = bField->inTesla(GlobalPoint(0., 0., 0.)).z();
}

reco::Candidate::Point PositionAtECalEntranceComputer::operator()	(	const reco::Candidate *	particle,
		bool &	success
	)		const

Definition at line 19 of file PositionAtECalEntranceComputer.cc.

References bField_z_, reco::Candidate::charge(), BaseParticlePropagator::getSuccess(), reco::Candidate::p4(), BaseParticlePropagator::particle(), position, BaseParticlePropagator::propagateToEcalEntrance(), PhotonConversionTrajectorySeedProducerFromQuadruplets_cfi::propagator, reco::Candidate::vertex(), and RawParticle::vertex().

                                                                                                                {
  assert(bField_z_ != -1.);
  BaseParticlePropagator propagator = BaseParticlePropagator(
      RawParticle(particle->p4(),
                  math::XYZTLorentzVector(particle->vertex().x(), particle->vertex().y(), particle->vertex().z(), 0.),
                  particle->charge()),
      0.,
      0.,
      bField_z_);
  propagator.propagateToEcalEntrance(false);
  reco::Candidate::Point position;
  if (propagator.getSuccess() != 0) {
    position = propagator.particle().vertex().Vect();
    success = true;
  } else {
    success = false;
  }
  return position;
}

Member Data Documentation

double PositionAtECalEntranceComputer::bField_z_

private

Definition at line 30 of file PositionAtECalEntranceComputer.h.

Referenced by beginEvent(), and operator()().