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// $Id: $
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#include "MitAna/DataTree/interface/Electron.h"
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Double_t mithep::Electron::ComputeTrackIsolation( Double_t extRadius, Double_t intRadius,
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Double_t ptLow, Double_t maxVtxZDist, Collection<Track> *tracks) {
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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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int counter;
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double ptSum =0.;
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const Track *electronTrack = this->Trk() ;
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ThreeVector *electronTrackMomentum = new ThreeVector(electronTrack->Mom().X(),electronTrack->Mom().Y(),electronTrack->Mom().Z());
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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(),tracks->At(i)->Mom().Y(),tracks->At(i)->Mom().Z());
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double tmpPt = tracks->At(i)->Pt();
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double deltaZ = fabs(electronTrack->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 dphi = (fabs(tmpTrackMomentum->Phi() - electronTrackMomentum->Phi()) > TMath::Pi())?(fabs(tmpTrackMomentum->Phi() - electronTrackMomentum->Phi()) - 2*TMath::Pi()):(fabs(tmpTrackMomentum->Phi() - electronTrackMomentum->Phi()));
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double deta = fabs(tmpTrackMomentum->Eta() - electronTrackMomentum->Eta());
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double dr = TMath::Sqrt(dphi*dphi + deta*deta);
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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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++counter ;
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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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Double_t mithep::Electron::ComputeEcalIsolation( Double_t coneSize, Double_t etLow, Collection<BasicCluster> *basicClusters) {
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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 ecalIsol=0.;
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ThreeVector *SClusterPosition = new ThreeVector (this->SCluster()->X(),this->SCluster()->Y(),this->SCluster()->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 basicClusterChi2 = basicCluster->ChiSq();
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double basicClusterEnergy = basicCluster->Energy();
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double basicClusterEta = basicCluster->Eta();
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double basicClusterEt = basicClusterEnergy*sin(2*atan(exp(basicClusterEta)));
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if (basicClusterEt > etLow && basicClusterChi2 < 30.) {
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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<this->SCluster()->ClusterSize(); j++) {
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const BasicCluster *tempBasicClusterInSuperCluster = this->SCluster()->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 dphi = (fabs(SClusterPosition->Phi() - basicClusterPosition->Phi()) > TMath::Pi())?(fabs(SClusterPosition->Phi() - basicClusterPosition->Phi()) - 2*TMath::Pi()):(fabs(SClusterPosition->Phi() - basicClusterPosition->Phi()));
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double deta = fabs(SClusterPosition->Eta() - basicClusterPosition->Eta());
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double dr = TMath::Sqrt(dphi*dphi + deta*deta);
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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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ClassImp(mithep::Electron)
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