[d7d2da3] | 1 |
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| 2 | /** \class TauTagging
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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 | * $Date$
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| 9 | * $Revision$
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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/TauTagging.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 TauTaggingPartonClassifier : public ExRootClassifier
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| 44 | {
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| 45 | public:
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| 46 |
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| 47 | TauTaggingPartonClassifier(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 | TauTaggingPartonClassifier::TauTaggingPartonClassifier(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 TauTaggingPartonClassifier::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 *daughter = 0;
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| 68 | const TLorentzVector &momentum = tau->Momentum;
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| 69 | Int_t pdgCode, i;
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| 70 |
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| 71 | pdgCode = TMath::Abs(tau->PID);
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| 72 | if(pdgCode != 15) return -1;
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| 73 |
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| 74 | if(momentum.Pt() <= fPTMin || TMath::Abs(momentum.Eta()) > fEtaMax) return -1;
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| 75 |
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| 76 | if(tau->D1 < 0) return -1;
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| 77 |
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| 78 | for(i = tau->D1; i <= tau->D2; ++i)
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| 79 | {
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| 80 | daughter = static_cast<Candidate *>(fParticleInputArray->At(i));
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| 81 | pdgCode = TMath::Abs(daughter->PID);
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| 82 | if(pdgCode == 11 || pdgCode == 13 || pdgCode == 15 || pdgCode == 24) return -1;
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| 83 | }
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| 84 |
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| 85 | return 0;
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| 86 | }
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| 87 |
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| 88 | //------------------------------------------------------------------------------
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| 89 |
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| 90 | TauTagging::TauTagging() :
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| 91 | fClassifier(0), fFilter(0),
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| 92 | fItPartonInputArray(0), fItJetInputArray(0)
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| 93 | {
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| 94 | }
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| 95 |
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| 96 | //------------------------------------------------------------------------------
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| 97 |
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| 98 | TauTagging::~TauTagging()
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| 99 | {
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| 100 | }
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| 101 |
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| 102 | //------------------------------------------------------------------------------
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| 103 |
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| 104 | void TauTagging::Init()
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| 105 | {
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| 106 | map< Int_t, DelphesFormula * >::iterator itEfficiencyMap;
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| 107 | ExRootConfParam param;
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| 108 | DelphesFormula *formula;
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| 109 | Int_t i, size;
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| 110 |
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| 111 | fDeltaR = GetDouble("DeltaR", 0.5);
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| 112 |
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| 113 | // read efficiency formulas
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| 114 | param = GetParam("EfficiencyFormula");
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| 115 | size = param.GetSize();
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| 116 |
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| 117 | fEfficiencyMap.clear();
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| 118 | for(i = 0; i < size/2; ++i)
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| 119 | {
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| 120 | formula = new DelphesFormula;
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| 121 | formula->Compile(param[i*2 + 1].GetString());
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| 122 |
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| 123 | fEfficiencyMap[param[i*2].GetInt()] = formula;
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| 124 | }
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| 125 |
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| 126 | // set default efficiency formula
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| 127 | itEfficiencyMap = fEfficiencyMap.find(0);
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| 128 | if(itEfficiencyMap == fEfficiencyMap.end())
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| 129 | {
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| 130 | formula = new DelphesFormula;
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| 131 | formula->Compile("0.0");
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| 132 |
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| 133 | fEfficiencyMap[0] = formula;
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| 134 | }
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| 135 |
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| 136 | // import input array(s)
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| 137 |
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| 138 | fParticleInputArray = ImportArray(GetString("ParticleInputArray", "Delphes/allParticles"));
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| 139 |
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| 140 | fClassifier = new TauTaggingPartonClassifier(fParticleInputArray);
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| 141 | fClassifier->fPTMin = GetDouble("TauPTMin", 1.0);
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| 142 | fClassifier->fEtaMax = GetDouble("TauEtaMax", 2.5);
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| 143 |
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| 144 | fPartonInputArray = ImportArray(GetString("PartonInputArray", "Delphes/partons"));
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| 145 | fItPartonInputArray = fPartonInputArray->MakeIterator();
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| 146 |
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| 147 | fFilter = new ExRootFilter(fPartonInputArray);
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| 148 |
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| 149 | fJetInputArray = ImportArray(GetString("JetInputArray", "FastJetFinder/jets"));
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| 150 | fItJetInputArray = fJetInputArray->MakeIterator();
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| 151 | }
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| 152 |
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| 153 | //------------------------------------------------------------------------------
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| 154 |
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| 155 | void TauTagging::Finish()
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| 156 | {
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| 157 | map< Int_t, DelphesFormula * >::iterator itEfficiencyMap;
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| 158 | DelphesFormula *formula;
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| 159 |
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| 160 | if(fFilter) delete fFilter;
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| 161 | if(fClassifier) delete fClassifier;
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| 162 | if(fItJetInputArray) delete fItJetInputArray;
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| 163 | if(fItPartonInputArray) delete fItPartonInputArray;
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| 164 |
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| 165 | for(itEfficiencyMap = fEfficiencyMap.begin(); itEfficiencyMap != fEfficiencyMap.end(); ++itEfficiencyMap)
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| 166 | {
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| 167 | formula = itEfficiencyMap->second;
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| 168 | if(formula) delete formula;
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| 169 | }
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| 170 | }
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| 171 |
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| 172 | //------------------------------------------------------------------------------
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| 173 |
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| 174 | void TauTagging::Process()
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| 175 | {
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| 176 | Candidate *jet, *tau;
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| 177 | Double_t pt, eta, phi;
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| 178 | TObjArray *tauArray;
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| 179 | map< Int_t, DelphesFormula * >::iterator itEfficiencyMap;
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| 180 | DelphesFormula *formula;
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| 181 | Int_t pdgCode, charge;
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| 182 |
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| 183 | // select taus
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| 184 | fFilter->Reset();
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| 185 | tauArray = fFilter->GetSubArray(fClassifier, 0);
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| 186 |
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| 187 | if(tauArray == 0) return;
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| 188 |
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| 189 | TIter itTauArray(tauArray);
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| 190 |
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| 191 | // loop over all input jets
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| 192 | fItJetInputArray->Reset();
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| 193 | while((jet = static_cast<Candidate *>(fItJetInputArray->Next())))
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| 194 | {
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| 195 | const TLorentzVector &jetMomentum = jet->Momentum;
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| 196 | pdgCode = 0;
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| 197 | charge = gRandom->Uniform() > 0.5 ? 1 : -1;
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| 198 | eta = jetMomentum.Eta();
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| 199 | phi = jetMomentum.Phi();
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| 200 | pt = jetMomentum.Pt();
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| 201 |
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| 202 | // loop over all input taus
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| 203 | itTauArray.Reset();
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| 204 | while((tau = static_cast<Candidate *>(itTauArray.Next())))
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| 205 | {
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| 206 | if(jetMomentum.DeltaR(tau->Momentum) <= fDeltaR)
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| 207 | {
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| 208 | pdgCode = 15;
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| 209 | charge = tau->Charge;
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| 210 | }
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| 211 | }
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| 212 | // find an efficency formula
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| 213 | itEfficiencyMap = fEfficiencyMap.find(pdgCode);
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| 214 | if(itEfficiencyMap == fEfficiencyMap.end())
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| 215 | {
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| 216 | itEfficiencyMap = fEfficiencyMap.find(0);
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| 217 | }
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| 218 | formula = itEfficiencyMap->second;
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| 219 |
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| 220 | // apply an efficency formula
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| 221 | jet->TauTag = gRandom->Uniform() <= formula->Eval(pt, eta);
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| 222 | // set tau charge
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| 223 | jet->Charge = charge;
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| 224 | }
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| 225 | }
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| 226 |
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| 227 | //------------------------------------------------------------------------------
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