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//
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// $Id: CaloIsolationEnergy.cc,v 1.2 2008/02/28 14:54:25 llista Exp $
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//
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#include "PhysicsTools/PatUtils/interface/CaloIsolationEnergy.h"
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#include "FWCore/MessageLogger/interface/MessageLogger.h"
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#include "FWCore/Utilities/interface/Exception.h"
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#include "FWCore/Framework/interface/ESHandle.h"
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#include "DataFormats/CaloTowers/interface/CaloTower.h"
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#include "DataFormats/PatCandidates/interface/Electron.h"
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#include "DataFormats/PatCandidates/interface/Muon.h"
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#include "DataFormats/GsfTrackReco/interface/GsfTrack.h"
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#include <vector>
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using namespace pat;
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/// constructor
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CaloIsolationEnergy::CaloIsolationEnergy() {
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}
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/// destructor
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CaloIsolationEnergy::~CaloIsolationEnergy() {
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}
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/// calculate the CalIsoE from the lepton object
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float CaloIsolationEnergy::calculate(const Electron & theElectron, const std::vector<CaloTower> & theTowers, float isoConeElectron) const {
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float isoE = this->calculate(*theElectron.gsfTrack(), theElectron.energy(), theTowers, isoConeElectron);
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return isoE - theElectron.caloEnergy();
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}
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float CaloIsolationEnergy::calculate(const Muon & theMuon, const std::vector<CaloTower> & theTowers, float isoConeMuon) const {
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return this->calculate(*theMuon.track(), theMuon.energy(), theTowers, isoConeMuon);
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}
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/// calculate the CalIsoE from the lepton's track
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float CaloIsolationEnergy::calculate(const reco::Track & theTrack, const float leptonEnergy, const std::vector<CaloTower> & theTowers, float isoCone) const {
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float isoELepton = 0;
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// calculate iso energy
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const CaloTower * closestTower = 0;
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float closestDR = 10000;
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for (std::vector<CaloTower>::const_iterator itTower = theTowers.begin(); itTower != theTowers.end(); itTower++) {
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// calculate dPhi with correct sign
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float dPhi = theTrack.phi() - itTower->phi();
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if (dPhi > M_PI) dPhi = -2*M_PI + dPhi;
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if (dPhi < -M_PI) dPhi = 2*M_PI + dPhi;
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// calculate dR
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float dR = sqrt(pow(theTrack.eta()-itTower->eta(), 2) + pow(dPhi, 2));
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// calculate energy in cone around direction at vertex of the track
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if (dR < isoCone) {
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isoELepton += itTower->energy();
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if (dR < closestDR) {
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closestDR = dR;
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closestTower = &(*itTower);
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}
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}
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}
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// subtract track deposits from total energy in cone
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// if (closestTower) isoELepton -= closestTower->energy();
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// return the iso energy
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return isoELepton;
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}
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