[7538969] | 1 |
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| 2 | /** \class TrackCountingTauTagging
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| 3 | *
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| 4 | * Determines origin of jet,
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| 5 | * applies b-tagging efficiency (miss identification rate) formulas
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| 6 | * and sets b-tagging flags
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| 7 | *
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| 8 | * $Date: 2013-07-12 00:22:27 +0200 (Fri, 12 Jul 2013) $
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| 9 | * $Revision: 1217 $
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| 10 | *
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| 11 | *
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| 12 | * \author P. Demin - UCL, Louvain-la-Neuve
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| 13 | *
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| 14 | */
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| 15 |
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| 16 | #include "modules/TrackCountingTauTagging.h"
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| 17 |
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| 18 | #include "classes/DelphesClasses.h"
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| 19 | #include "classes/DelphesFactory.h"
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| 20 | #include "classes/DelphesFormula.h"
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| 21 |
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| 22 | #include "ExRootAnalysis/ExRootResult.h"
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| 23 | #include "ExRootAnalysis/ExRootFilter.h"
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| 24 | #include "ExRootAnalysis/ExRootClassifier.h"
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| 25 |
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| 26 | #include "TMath.h"
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| 27 | #include "TString.h"
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| 28 | #include "TFormula.h"
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| 29 | #include "TRandom3.h"
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| 30 | #include "TObjArray.h"
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| 31 | #include "TDatabasePDG.h"
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| 32 | #include "TLorentzVector.h"
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| 33 |
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| 34 | #include <algorithm>
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| 35 | #include <stdexcept>
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| 36 | #include <iostream>
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| 37 | #include <sstream>
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| 38 |
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| 39 | using namespace std;
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| 40 |
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| 41 | //------------------------------------------------------------------------------
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| 42 |
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| 43 | class TrackCountingTauTaggingPartonClassifier : public ExRootClassifier
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| 44 | {
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| 45 | public:
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| 46 |
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| 47 | TrackCountingTauTaggingPartonClassifier(const TObjArray *array);
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| 48 |
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| 49 | Int_t GetCategory(TObject *object);
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| 50 |
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| 51 | Double_t fEtaMax, fPTMin;
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| 52 |
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| 53 | const TObjArray *fParticleInputArray;
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| 54 | };
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| 55 |
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| 56 | //------------------------------------------------------------------------------
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| 57 | TrackCountingTauTaggingPartonClassifier::TrackCountingTauTaggingPartonClassifier(const TObjArray *array) :
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| 58 | fParticleInputArray(array)
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| 59 | {
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| 60 | }
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| 61 |
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| 62 | //------------------------------------------------------------------------------
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| 63 |
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| 64 | Int_t TrackCountingTauTaggingPartonClassifier::GetCategory(TObject *object)
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| 65 | {
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| 66 | Candidate *tau = static_cast<Candidate *>(object);
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| 67 | Candidate *daughter1 = 0;
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| 68 | Candidate *daughter2 = 0;
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| 69 |
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| 70 | const TLorentzVector &momentum = tau->Momentum;
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| 71 | Int_t pdgCode, i, j;
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| 72 |
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| 73 | pdgCode = TMath::Abs(tau->PID);
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| 74 | if(pdgCode != 15) return -1;
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| 75 |
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| 76 | if(momentum.Pt() <= fPTMin || TMath::Abs(momentum.Eta()) > fEtaMax) return -1;
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| 77 |
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| 78 | if(tau->D1 < 0) return -1;
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| 79 |
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| 80 | if(tau->D2 < tau->D1) return -1;
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| 81 |
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| 82 | if(tau->D1 >= fParticleInputArray->GetEntriesFast() ||
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| 83 | tau->D2 >= fParticleInputArray->GetEntriesFast())
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| 84 | {
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| 85 | throw runtime_error("tau's daughter index is greater than the ParticleInputArray size");
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| 86 | }
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| 87 |
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| 88 | for(i = tau->D1; i <= tau->D2; ++i)
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| 89 | {
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| 90 | daughter1 = static_cast<Candidate *>(fParticleInputArray->At(i));
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| 91 | pdgCode = TMath::Abs(daughter1->PID);
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| 92 | if(pdgCode == 11 || pdgCode == 13 || pdgCode == 15) return -1;
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| 93 | else if(pdgCode == 24)
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| 94 | {
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| 95 | if(daughter1->D1 < 0) return -1;
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| 96 | for(j = daughter1->D1; j <= daughter1->D2; ++j)
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| 97 | {
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| 98 | daughter2 = static_cast<Candidate*>(fParticleInputArray->At(j));
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| 99 | pdgCode = TMath::Abs(daughter2->PID);
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| 100 | if(pdgCode == 11 || pdgCode == 13) return -1;
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| 101 | }
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| 102 |
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| 103 | }
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| 104 | }
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| 105 |
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| 106 | return 0;
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| 107 | }
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| 108 |
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| 109 | //------------------------------------------------------------------------------
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| 110 |
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| 111 | TrackCountingTauTagging::TrackCountingTauTagging() :
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| 112 | fClassifier(0), fFilter(0),
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| 113 | fItPartonInputArray(0), fItTrackInputArray(0), fItJetInputArray(0)
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| 114 | {
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| 115 | }
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| 116 |
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| 117 | //------------------------------------------------------------------------------
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| 118 |
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| 119 | TrackCountingTauTagging::~TrackCountingTauTagging()
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| 120 | {
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| 121 | }
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| 122 |
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| 123 | //------------------------------------------------------------------------------
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| 124 |
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| 125 | void TrackCountingTauTagging::Init()
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| 126 | {
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| 127 | map< Int_t, DelphesFormula * >::iterator itEfficiencyMap;
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| 128 | ExRootConfParam param;
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| 129 | DelphesFormula *formula;
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| 130 | Int_t i, size;
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| 131 |
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[7e227ae] | 132 | fBitNumber = GetInt("BitNumber", 0);
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| 133 |
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[7538969] | 134 | fDeltaR = GetDouble("DeltaR", 0.5);
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| 135 | fDeltaRTrack = GetDouble("DeltaRTrack", 0.2);
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| 136 | fTrackPTMin = GetDouble("TrackPTMin", 1.0);
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| 137 |
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| 138 | // read efficiency formulas
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| 139 | param = GetParam("EfficiencyFormula");
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| 140 | size = param.GetSize();
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| 141 |
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| 142 | fEfficiencyMap.clear();
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| 143 | for(i = 0; i < size/2; ++i)
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| 144 | {
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| 145 | formula = new DelphesFormula;
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| 146 | formula->Compile(param[i*2 + 1].GetString());
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| 147 |
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| 148 | fEfficiencyMap[param[i*2].GetInt()] = formula;
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| 149 | }
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| 150 |
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| 151 | // set default efficiency formula
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| 152 | itEfficiencyMap = fEfficiencyMap.find(0);
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| 153 | if(itEfficiencyMap == fEfficiencyMap.end())
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| 154 | {
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| 155 | formula = new DelphesFormula;
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| 156 | formula->Compile("0.0");
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| 157 |
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| 158 | fEfficiencyMap[0] = formula;
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| 159 | }
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| 160 |
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| 161 | // import input array(s)
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| 162 |
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| 163 | fParticleInputArray = ImportArray(GetString("ParticleInputArray", "Delphes/allParticles"));
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| 164 |
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| 165 | fClassifier = new TrackCountingTauTaggingPartonClassifier(fParticleInputArray);
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| 166 | fClassifier->fPTMin = GetDouble("TauPTMin", 1.0);
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| 167 | fClassifier->fEtaMax = GetDouble("TauEtaMax", 2.5);
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| 168 |
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| 169 | fPartonInputArray = ImportArray(GetString("PartonInputArray", "Delphes/partons"));
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| 170 | fItPartonInputArray = fPartonInputArray->MakeIterator();
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| 171 |
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| 172 | fTrackInputArray = ImportArray(GetString("TrackInputArray", "TrackMerger/tracks"));
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| 173 | fItTrackInputArray = fTrackInputArray->MakeIterator();
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| 174 |
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| 175 | fFilter = new ExRootFilter(fPartonInputArray);
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| 176 |
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| 177 | fJetInputArray = ImportArray(GetString("JetInputArray", "FastJetFinder/jets"));
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| 178 | fItJetInputArray = fJetInputArray->MakeIterator();
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| 179 | }
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| 180 |
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| 181 | //------------------------------------------------------------------------------
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| 182 |
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| 183 | void TrackCountingTauTagging::Finish()
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| 184 | {
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| 185 | map< Int_t, DelphesFormula * >::iterator itEfficiencyMap;
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| 186 | DelphesFormula *formula;
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| 187 |
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| 188 | if(fFilter) delete fFilter;
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| 189 | if(fClassifier) delete fClassifier;
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| 190 | if(fItJetInputArray) delete fItJetInputArray;
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| 191 | if(fItTrackInputArray) delete fItTrackInputArray;
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| 192 | if(fItPartonInputArray) delete fItPartonInputArray;
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| 193 |
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| 194 | for(itEfficiencyMap = fEfficiencyMap.begin(); itEfficiencyMap != fEfficiencyMap.end(); ++itEfficiencyMap)
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| 195 | {
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| 196 | formula = itEfficiencyMap->second;
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| 197 | if(formula) delete formula;
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| 198 | }
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| 199 | }
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| 200 |
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| 201 | //------------------------------------------------------------------------------
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| 202 |
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| 203 | void TrackCountingTauTagging::Process()
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| 204 | {
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| 205 | Candidate *jet, *tau, *track, *daughter;
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| 206 | TLorentzVector tauMomentum;
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[7e227ae] | 207 | Double_t pt, eta, phi, e;
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[7538969] | 208 | TObjArray *tauArray;
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| 209 | map< Int_t, DelphesFormula * >::iterator itEfficiencyMap;
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| 210 | DelphesFormula *formula;
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| 211 | Int_t pdgCode, charge, i, identifier;
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| 212 |
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| 213 | // select taus
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| 214 | fFilter->Reset();
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| 215 | tauArray = fFilter->GetSubArray(fClassifier, 0);
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| 216 |
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| 217 | if(tauArray == 0) return;
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| 218 |
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| 219 | TIter itTauArray(tauArray);
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| 220 |
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| 221 | // loop over all input jets
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| 222 | fItJetInputArray->Reset();
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| 223 | while((jet = static_cast<Candidate *>(fItJetInputArray->Next())))
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| 224 | {
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| 225 | identifier = 0;
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| 226 | const TLorentzVector &jetMomentum = jet->Momentum;
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| 227 | pdgCode = 0;
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| 228 | charge = 0;
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| 229 | eta = jetMomentum.Eta();
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| 230 | phi = jetMomentum.Phi();
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| 231 | pt = jetMomentum.Pt();
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[7e227ae] | 232 | e = jetMomentum.E();
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| 233 |
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[7538969] | 234 |
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| 235 | // loop over all input tracks
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| 236 | fItTrackInputArray->Reset();
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| 237 | while((track = static_cast<Candidate *>(fItTrackInputArray->Next())))
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| 238 | {
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| 239 | if((track->Momentum).Pt() < fTrackPTMin) continue;
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| 240 | if(jetMomentum.DeltaR(track->Momentum) <= fDeltaRTrack) {
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| 241 | identifier -= 1;
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| 242 | charge += track->Charge;
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| 243 | }
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| 244 | }
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| 245 |
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| 246 | // loop over all input taus
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| 247 | itTauArray.Reset();
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| 248 | bool matchedTau = false;
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| 249 | while((tau = static_cast<Candidate *>(itTauArray.Next())))
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| 250 | {
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| 251 | if(tau->D1 < 0) continue;
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| 252 |
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| 253 | if(tau->D1 >= fParticleInputArray->GetEntriesFast() ||
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| 254 | tau->D2 >= fParticleInputArray->GetEntriesFast())
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| 255 | {
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| 256 | throw runtime_error("tau's daughter index is greater than the ParticleInputArray size");
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| 257 | }
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| 258 |
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| 259 | tauMomentum.SetPxPyPzE(0.0, 0.0, 0.0, 0.0);
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| 260 |
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| 261 | for(i = tau->D1; i <= tau->D2; ++i)
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| 262 | {
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| 263 | daughter = static_cast<Candidate *>(fParticleInputArray->At(i));
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| 264 | if(TMath::Abs(daughter->PID) == 16) continue;
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| 265 | tauMomentum += daughter->Momentum;
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| 266 | }
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| 267 |
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| 268 | if(jetMomentum.DeltaR(tauMomentum) <= fDeltaR)
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| 269 | {
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| 270 | matchedTau = true;
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| 271 | pdgCode = 15;
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| 272 | }
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| 273 | }
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| 274 | if(matchedTau)
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| 275 | identifier *= -1;
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| 276 | // find an efficency formula
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| 277 | // If the identifier is larger than 2, set it to 2 (multiprong requires at least 2 tracks)
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| 278 | if (identifier > 2)
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| 279 | identifier = 2;
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| 280 | else if (identifier < -2)
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| 281 | identifier = -2;
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| 282 |
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| 283 |
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| 284 | itEfficiencyMap = fEfficiencyMap.find(identifier);
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| 285 | if(itEfficiencyMap == fEfficiencyMap.end())
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| 286 | {
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| 287 | itEfficiencyMap = fEfficiencyMap.find(0);
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| 288 | }
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| 289 | formula = itEfficiencyMap->second;
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| 290 |
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| 291 | // apply an efficency formula
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| 292 |
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| 293 | // apply an efficency formula
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[7e227ae] | 294 | jet->TauTag |= (gRandom->Uniform() <= formula->Eval(pt, eta, phi, e)) << fBitNumber;
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| 295 |
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| 296 |
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[7538969] | 297 | // set tau charge
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| 298 | jet->Charge = charge;
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| 299 | }
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| 300 | }
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| 301 |
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| 302 | //------------------------------------------------------------------------------
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