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// $Id: IsolationTools.cc,v 1.2 2008/09/10 03:33:29 loizides Exp $
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#include "MitPhysics/Utils/interface/IsolationTools.h"
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#include "MitCommon/MathTools/interface/MathUtils.h"
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using namespace mithep;
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//--------------------------------------------------------------------------------------------------
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Double_t IsolationTools::TrackIsolation(const Track *p, Double_t extRadius, Double_t intRadius,
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Double_t ptLow, Double_t maxVtxZDist,
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Collection<Track> *tracks)
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{
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//Computes the Track Isolation: Summed Transverse Momentum of all tracks inside an
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//annulus around the electron seed track.
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Double_t ptSum =0.;
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for (UInt_t i=0; i<tracks->GetEntries();i++) {
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ThreeVector *tmpTrackMomentum = new ThreeVector(tracks->At(i)->Mom().X(),
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tracks->At(i)->Mom().Y(),
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tracks->At(i)->Mom().Z());
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Double_t tmpPt = tracks->At(i)->Pt();
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Double_t deltaZ = fabs(p->Z0() - tracks->At(i)->Z0());
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//ignore the track if it is below the pt threshold
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if (tmpPt < ptLow)
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continue;
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//ingore the track if it is too far away in Z
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if (deltaZ > maxVtxZDist)
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continue;
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Double_t dr = MathUtils::DeltaR(p->Mom().Phi(),p->Mom().Eta(),tmpTrackMomentum->Phi(),
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tmpTrackMomentum->Eta());
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//add the track pt if it is inside the annulus
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if ( dr < extRadius &&
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dr >= intRadius ) {
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ptSum += tmpPt;
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}
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}
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return ptSum;
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}
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//--------------------------------------------------------------------------------------------------
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Double_t IsolationTools::EcalIsolation(const SuperCluster *sc, Double_t coneSize, Double_t etLow,
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Collection<BasicCluster> *basicClusters)
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{
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//Computes the Ecal Isolation: Summed Transverse Energy of all Basic Clusters inside a
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//cone around the electron, excluding those that are inside the electron super cluster.
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Double_t ecalIsol=0.;
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ThreeVector *SClusterPosition = new ThreeVector (sc->X(),sc->Y(),sc->Z());
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const BasicCluster *basicCluster= 0;
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for (UInt_t i=0; i<basicClusters->GetEntries();i++) {
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basicCluster = basicClusters->At(i);
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Double_t basicClusterChi2 = basicCluster->ChiSq();
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Double_t basicClusterEnergy = basicCluster->Energy();
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Double_t basicClusterEta = basicCluster->Eta();
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Double_t basicClusterEt = basicClusterEnergy*sin(2*atan(exp(basicClusterEta)));
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if (basicClusterEt > etLow && basicClusterChi2 < 30. && basicCluster->AlgoId()==0) {
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bool inSuperCluster = false;
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// loop over the basic clusters of the supercluster
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// to make sure that the basic cluster is not inside
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// the super cluster. We exclude those.
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for (UInt_t j=0; j<sc->ClusterSize(); j++) {
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const BasicCluster *tempBasicClusterInSuperCluster = sc->Cluster(j);
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if (tempBasicClusterInSuperCluster == basicCluster) {
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inSuperCluster = true;
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}
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}
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if (!inSuperCluster) {
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ThreeVector *basicClusterPosition = new ThreeVector(basicCluster->X(),
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basicCluster->Y(),
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basicCluster->Z());
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Double_t dr = MathUtils::DeltaR(SClusterPosition->Phi(), SClusterPosition->Eta(),
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basicClusterPosition->Phi(),basicClusterPosition->Eta());
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if(dr < coneSize) {
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ecalIsol += basicClusterEt;
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}
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}
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}
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}
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return ecalIsol;
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}
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//--------------------------------------------------------------------------------------------------
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Double_t IsolationTools::CaloTowerHadIsolation(const ThreeVector *p, Double_t extRadius,
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Double_t intRadius, Double_t etLow,
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Collection<CaloTower> *caloTowers)
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{
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//Computes the CaloTower Had Et Isolation: Summed Hadronic Transverse Energy of all Calo Towers
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//inside an annulus around the electron super cluster position.
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Double_t sumEt = 0;
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for (UInt_t i=0; i<caloTowers->GetEntries();i++) {
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Double_t caloTowerEt = caloTowers->At(i)->HadEt();
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Double_t dr = MathUtils::DeltaR(caloTowers->At(i)->Phi(), caloTowers->At(i)->Eta(),
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p->Phi(), p->Eta());
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if (dr < extRadius && dr > intRadius && caloTowerEt > etLow) {
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sumEt += caloTowerEt;
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}
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}
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return sumEt;
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}
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//--------------------------------------------------------------------------------------------------
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Double_t IsolationTools::CaloTowerEmIsolation(const ThreeVector *p, Double_t extRadius,
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Double_t intRadius, Double_t etLow,
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Collection<CaloTower> *caloTowers)
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{
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//Computes the CaloTower Em Et Isolation: Summed Hadronic Transverse Energy of all Calo Towers
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//inside an annulus around the electron super cluster position.
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Double_t sumEt = 0;
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for (UInt_t i=0; i<caloTowers->GetEntries();i++) {
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Double_t caloTowerEt = caloTowers->At(i)->EmEt();
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Double_t dr = MathUtils::DeltaR(caloTowers->At(i)->Phi(), caloTowers->At(i)->Eta(),
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p->Phi(), p->Eta());
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if (dr < extRadius && dr > intRadius && caloTowerEt > etLow) {
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sumEt += caloTowerEt;
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}
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}
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return sumEt;
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}
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