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//
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// $Id: TrackerIsolationPt.cc,v 1.4 2008/03/03 16:45:29 lowette Exp $
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//
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#include "PhysicsTools/PatUtils/interface/TrackerIsolationPt.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/Common/interface/Handle.h"
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#include "CLHEP/Vector/LorentzVector.h"
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#include "DataFormats/GeometryVector/interface/GlobalVector.h"
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#include "FWCore/ParameterSet/interface/InputTag.h"
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#include "DataFormats/Common/interface/View.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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TrackerIsolationPt::TrackerIsolationPt() {
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}
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/// destructor
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TrackerIsolationPt::~TrackerIsolationPt() {
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}
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/// calculate the TrackIsoPt for the lepton object
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float TrackerIsolationPt::calculate(const Electron & theElectron, const edm::View<reco::Track> & theTracks, float isoConeElectron) const {
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return this->calculate(*theElectron.gsfTrack(), theTracks, isoConeElectron);
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}
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float TrackerIsolationPt::calculate(const Muon & theMuon, const edm::View<reco::Track> & theTracks, float isoConeMuon) const {
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return this->calculate(*theMuon.track(), theTracks, isoConeMuon);
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}
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/// calculate the TrackIsoPt for the lepton's track
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float TrackerIsolationPt::calculate(const reco::Track & theTrack, const edm::View<reco::Track> & theTracks, float isoCone) const {
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// initialize some variables
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float isoPtLepton = 0;
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const reco::Track * closestTrackDRPt = 0, * closestTrackDR = 0;
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float closestDRPt = 10000, closestDR = 10000;
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// use all these pointless vector conversions because the momenta from tracks
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// are completely unusable; bah, these math-vectors are worthless!
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HepLorentzVector lepton(theTrack.px(), theTrack.py(), theTrack.pz(), theTrack.p());
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for (edm::View<reco::Track>::const_iterator itTrack = theTracks.begin(); itTrack != theTracks.end(); itTrack++) {
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HepLorentzVector track(itTrack->px(), itTrack->py(), itTrack->pz(), itTrack->p());
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float dR = lepton.deltaR(track);
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if (dR < isoCone) {
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isoPtLepton += track.perp();
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// find the closest matching track
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// FIXME: we could association by hits or chi2 to match
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float pRatio = track.perp()/lepton.perp();
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if (dR < closestDRPt && pRatio > 0.5 && pRatio < 1.5) {
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closestDRPt = dR;
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closestTrackDRPt = &*itTrack;
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}
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if (dR < closestDR) {
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closestDR = dR;
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closestTrackDR = &*itTrack;
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}
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}
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}
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if (closestTrackDRPt) {
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GlobalVector closestTrackVector(closestTrackDRPt->px(), closestTrackDRPt->py(), closestTrackDRPt->pz());
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isoPtLepton -= closestTrackVector.perp();
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} else if (closestTrackDR) {
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GlobalVector closestTrackVector(closestTrackDR->px(), closestTrackDR->py(), closestTrackDR->pz());
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isoPtLepton -= closestTrackVector.perp();
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}
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// back to normal sum - S.L. 30/10/2007
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if (isoPtLepton<0) isoPtLepton = 0;
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// isoPtLepton <= 0.01 ? isoPtLepton = -1 : isoPtLepton = log(isoPtLepton);
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return isoPtLepton;
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}
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