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File indexing completed on 2021-10-19 10:28:42

0001 //*****************************************************************************
0002 // File:      EgammaRecHitIsolation.cc
0003 // ----------------------------------------------------------------------------
0004 // OrigAuth:  Matthias Mozer, hacked by Sam Harper (ie the ugly stuff is mine)
0005 // Institute: IIHE-VUB, RAL
0006 //=============================================================================
0007 //*****************************************************************************
0008 
0009 #include "RecoEgamma/EgammaIsolationAlgos/interface/EcalPFClusterIsolation.h"
0010 
0011 #include "DataFormats/RecoCandidate/interface/RecoEcalCandidate.h"
0012 #include "DataFormats/RecoCandidate/interface/RecoChargedCandidate.h"
0013 #include "DataFormats/EgammaCandidates/interface/GsfElectron.h"
0014 #include "DataFormats/EgammaCandidates/interface/Photon.h"
0015 
0016 #include <DataFormats/Math/interface/deltaR.h>
0017 
0018 template <typename T1>
0019 EcalPFClusterIsolation<T1>::EcalPFClusterIsolation(double drMax,
0020                                                    double drVetoBarrel,
0021                                                    double drVetoEndcap,
0022                                                    double etaStripBarrel,
0023                                                    double etaStripEndcap,
0024                                                    double energyBarrel,
0025                                                    double energyEndcap)
0026     : drMax_(drMax),
0027       drVetoBarrel_(drVetoBarrel),
0028       drVetoEndcap_(drVetoEndcap),
0029       etaStripBarrel_(etaStripBarrel),
0030       etaStripEndcap_(etaStripEndcap),
0031       energyBarrel_(energyBarrel),
0032       energyEndcap_(energyEndcap) {}
0033 
0034 template <typename T1>
0035 EcalPFClusterIsolation<T1>::~EcalPFClusterIsolation() {}
0036 
0037 template <typename T1>
0038 bool EcalPFClusterIsolation<T1>::computedRVeto(T1Ref candRef, reco::PFClusterRef pfclu) {
0039   float dR2 = deltaR2(candRef->eta(), candRef->phi(), pfclu->eta(), pfclu->phi());
0040   if (dR2 > (drMax_ * drMax_))
0041     return false;
0042 
0043   if (candRef->superCluster().isNonnull()) {
0044     // Exclude clusters that are part of the candidate
0045     for (reco::CaloCluster_iterator it = candRef->superCluster()->clustersBegin();
0046          it != candRef->superCluster()->clustersEnd();
0047          ++it) {
0048       if ((*it)->seed() == pfclu->seed()) {
0049         return false;
0050       }
0051     }
0052   }
0053 
0054   return true;
0055 }
0056 
0057 template <>
0058 bool EcalPFClusterIsolation<reco::RecoChargedCandidate>::computedRVeto(T1Ref candRef, reco::PFClusterRef pfclu) {
0059   float dR2 = deltaR2(candRef->eta(), candRef->phi(), pfclu->eta(), pfclu->phi());
0060   if (dR2 > (drMax_ * drMax_) || dR2 < drVeto2_)
0061     return false;
0062   else
0063     return true;
0064 }
0065 
0066 template <typename T1>
0067 double EcalPFClusterIsolation<T1>::getSum(const T1 cand, edm::Handle<reco::PFClusterCollection> clusterHandle) {
0068   drVeto2_ = -1.;
0069   float etaStrip = -1;
0070 
0071   if (std::abs(cand.eta()) < 1.479) {
0072     drVeto2_ = drVetoBarrel_ * drVetoBarrel_;
0073     etaStrip = etaStripBarrel_;
0074   } else {
0075     drVeto2_ = drVetoEndcap_ * drVetoEndcap_;
0076     etaStrip = etaStripEndcap_;
0077   }
0078 
0079   float etSum = 0;
0080   for (size_t i = 0; i < clusterHandle->size(); i++) {
0081     reco::PFClusterRef pfclu(clusterHandle, i);
0082 
0083     if (std::abs(cand.eta()) < 1.479) {
0084       if (std::abs(pfclu->pt()) < energyBarrel_)
0085         continue;
0086     } else {
0087       if (std::abs(pfclu->energy()) < energyEndcap_)
0088         continue;
0089     }
0090 
0091     float dEta = std::abs(cand.eta() - pfclu->eta());
0092     if (dEta < etaStrip)
0093       continue;
0094     if (not computedRVeto(cand, pfclu))
0095       continue;
0096 
0097     etSum += pfclu->pt();
0098   }
0099 
0100   return etSum;
0101 }
0102 
0103 template <typename T1>
0104 double EcalPFClusterIsolation<T1>::getSum(T1Ref ref, edm::Handle<std::vector<reco::PFCluster> > clusts) {
0105   return getSum(*ref, clusts);
0106 }
0107 
0108 template <typename T1>
0109 bool EcalPFClusterIsolation<T1>::computedRVeto(T1 cand, reco::PFClusterRef pfclu) {
0110   float dR2 = deltaR2(cand.eta(), cand.phi(), pfclu->eta(), pfclu->phi());
0111   if (dR2 > (drMax_ * drMax_))
0112     return false;
0113 
0114   if (cand.superCluster().isNonnull()) {
0115     // Exclude clusters that are part of the candidate
0116     for (reco::CaloCluster_iterator it = cand.superCluster()->clustersBegin(); it != cand.superCluster()->clustersEnd();
0117          ++it) {
0118       if ((*it)->seed() == pfclu->seed()) {
0119         return false;
0120       }
0121     }
0122   }
0123 
0124   return true;
0125 }
0126 
0127 template class EcalPFClusterIsolation<reco::RecoEcalCandidate>;
0128 template class EcalPFClusterIsolation<reco::RecoChargedCandidate>;
0129 template class EcalPFClusterIsolation<reco::Photon>;
0130 template class EcalPFClusterIsolation<reco::GsfElectron>;