ElectronSqPtTkIsolation Class Reference

#include <ElectronSqPtTkIsolation.h>

Public Member Functions
	ElectronSqPtTkIsolation (double extRadius, double intRadius, double ptLow, double lip, const reco::TrackCollection *)
int	getNumberTracks (const reco::GsfElectron *) const
double	getPtTracks (const reco::GsfElectron *) const
	~ElectronSqPtTkIsolation ()

Private Member Functions
std::pair< int, double >	getIso (const reco::GsfElectron *) const

Private Attributes
double	extRadius_
double	intRadius_
double	lip_
double	ptLow_
const reco::TrackCollection *	trackCollection_

Detailed Description

Definition at line 17 of file ElectronSqPtTkIsolation.h.

Constructor & Destructor Documentation

ElectronSqPtTkIsolation::ElectronSqPtTkIsolation	(	double	extRadius,
		double	intRadius,
		double	ptLow,
		double	lip,
		const reco::TrackCollection *	trackCollection
	)

Definition at line 20 of file ElectronSqPtTkIsolation.cc.

                                                            :
  extRadius_(extRadius),
  intRadius_(intRadius),
  ptLow_(ptLow),
  lip_(lip),
  trackCollection_(trackCollection)  
{
}

ElectronSqPtTkIsolation::~ElectronSqPtTkIsolation

(

)

Definition at line 33 of file ElectronSqPtTkIsolation.cc.

{
}

Member Function Documentation

std::pair< int, double > ElectronSqPtTkIsolation::getIso ( const reco::GsfElectron *  electron ) const

private

Definition at line 38 of file ElectronSqPtTkIsolation.cc.

References extRadius_, reco::GsfElectron::gsfTrack(), intRadius_, lip_, and ptLow_.

Referenced by getNumberTracks(), and getPtTracks().

{
  int counter  =0 ;
  double ptSum =0.;
  //Take the electron track
  reco::GsfTrackRef tmpTrack = electron->gsfTrack() ;
  math::XYZVector tmpElectronMomentumAtVtx = (*tmpTrack).momentum () ; 

  for ( reco::TrackCollection::const_iterator itrTr  = (*trackCollection_).begin() ; 
                                              itrTr != (*trackCollection_).end()   ; 
                              ++itrTr ) 
    {
    math::XYZVector tmpTrackMomentumAtVtx = (*itrTr).momentum () ; 
    double this_pt  = (*itrTr).pt();
    if ( this_pt < ptLow_ ) 
      continue ;  
    if (fabs( (*itrTr).dz() - (*tmpTrack).dz() ) > lip_ )
          continue ;
    double dr = DeltaR(tmpTrackMomentumAtVtx,tmpElectronMomentumAtVtx) ;
    if ( fabs(dr) < extRadius_ && 
         fabs(dr) >= intRadius_ )
      {
        ++counter ;
        ptSum += this_pt*this_pt;    // sum of squared pT
      }
    }//end loop over tracks                 

  std::pair<int,double> retval;
  retval.first  = counter;
  retval.second = ptSum;

  return retval;
}

int ElectronSqPtTkIsolation::getNumberTracks

(

const reco::GsfElectron *

electron

)

const

Definition at line 73 of file ElectronSqPtTkIsolation.cc.

References getIso().

{  
  //counter for the tracks in the isolation cone
  return getIso(electron).first ;
}

double ElectronSqPtTkIsolation::getPtTracks

(

const reco::GsfElectron *

electron

)

const

Definition at line 79 of file ElectronSqPtTkIsolation.cc.

References getIso().

Referenced by ElectronSqPtTkIsolationProducer::produce().

{
  return getIso(electron).second ;
}

Member Data Documentation

double ElectronSqPtTkIsolation::extRadius_

private

Definition at line 36 of file ElectronSqPtTkIsolation.h.

Referenced by getIso().

double ElectronSqPtTkIsolation::intRadius_

private

Definition at line 37 of file ElectronSqPtTkIsolation.h.

Referenced by getIso().

double ElectronSqPtTkIsolation::lip_

private

Definition at line 39 of file ElectronSqPtTkIsolation.h.

Referenced by getIso().

double ElectronSqPtTkIsolation::ptLow_

private

Definition at line 38 of file ElectronSqPtTkIsolation.h.

Referenced by getIso().

const reco::TrackCollection* ElectronSqPtTkIsolation::trackCollection_

private

Definition at line 41 of file ElectronSqPtTkIsolation.h.