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: 2013-03-21 00:23:25 +0100 (Thu, 21 Mar 2013) $ |
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9 | * $Revision: 1065 $ |
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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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