1 | |
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2 | /** \class Isolation |
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3 | * |
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4 | * Sums transverse momenta of isolation objects (tracks, calorimeter towers, etc) |
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5 | * within a DeltaR cone around a candidate and calculates fraction of this sum |
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6 | * to the candidate's transverse momentum. outputs candidates that have |
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7 | * the transverse momenta fraction within (PTRatioMin, PTRatioMax]. |
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8 | * |
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9 | * $Date: 2013-03-06 18:11:35 +0100 (Wed, 06 Mar 2013) $ |
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10 | * $Revision: 1033 $ |
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11 | * |
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12 | * |
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13 | * \author P. Demin - UCL, Louvain-la-Neuve |
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14 | * |
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15 | */ |
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16 | |
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17 | #include "modules/Isolation.h" |
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18 | |
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19 | #include "classes/DelphesClasses.h" |
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20 | #include "classes/DelphesFactory.h" |
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21 | #include "classes/DelphesFormula.h" |
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22 | |
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23 | #include "ExRootAnalysis/ExRootResult.h" |
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24 | #include "ExRootAnalysis/ExRootFilter.h" |
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25 | #include "ExRootAnalysis/ExRootClassifier.h" |
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26 | |
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27 | #include "TMath.h" |
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28 | #include "TString.h" |
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29 | #include "TFormula.h" |
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30 | #include "TRandom3.h" |
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31 | #include "TObjArray.h" |
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32 | #include "TDatabasePDG.h" |
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33 | #include "TLorentzVector.h" |
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34 | |
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35 | #include <algorithm> |
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36 | #include <stdexcept> |
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37 | #include <iostream> |
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38 | #include <sstream> |
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39 | |
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40 | using namespace std; |
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41 | |
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42 | //------------------------------------------------------------------------------ |
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43 | |
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44 | class IsolationClassifier : public ExRootClassifier |
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45 | { |
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46 | public: |
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47 | |
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48 | IsolationClassifier() {} |
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49 | |
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50 | Int_t GetCategory(TObject *object); |
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51 | |
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52 | Double_t fPTMin; |
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53 | }; |
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54 | |
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55 | //------------------------------------------------------------------------------ |
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56 | |
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57 | Int_t IsolationClassifier::GetCategory(TObject *object) |
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58 | { |
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59 | Candidate *track = static_cast<Candidate*>(object); |
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60 | const TLorentzVector &momentum = track->Momentum; |
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61 | |
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62 | if(momentum.Pt() < fPTMin) return -1; |
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63 | |
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64 | return 0; |
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65 | } |
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66 | |
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67 | //------------------------------------------------------------------------------ |
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68 | |
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69 | Isolation::Isolation() : |
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70 | fClassifier(0), fFilter(0), |
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71 | fItIsolationInputArray(0), fItCandidateInputArray(0) |
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72 | { |
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73 | fClassifier = new IsolationClassifier; |
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74 | } |
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75 | |
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76 | //------------------------------------------------------------------------------ |
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77 | |
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78 | Isolation::~Isolation() |
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79 | { |
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80 | } |
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81 | |
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82 | //------------------------------------------------------------------------------ |
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83 | |
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84 | void Isolation::Init() |
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85 | { |
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86 | const char *rhoInputArrayName; |
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87 | |
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88 | fDeltaRMax = GetDouble("DeltaRMax", 0.5); |
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89 | |
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90 | fPTRatioMax = GetDouble("PTRatioMax", 0.1); |
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91 | |
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92 | fClassifier->fPTMin = GetDouble("PTMin", 0.5); |
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93 | |
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94 | // import input array(s) |
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95 | |
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96 | fIsolationInputArray = ImportArray(GetString("IsolationInputArray", "Delphes/partons")); |
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97 | fItIsolationInputArray = fIsolationInputArray->MakeIterator(); |
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98 | |
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99 | fFilter = new ExRootFilter(fIsolationInputArray); |
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100 | |
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101 | fCandidateInputArray = ImportArray(GetString("CandidateInputArray", "Calorimeter/electrons")); |
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102 | fItCandidateInputArray = fCandidateInputArray->MakeIterator(); |
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103 | |
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104 | rhoInputArrayName = GetString("RhoInputArray", ""); |
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105 | if(rhoInputArrayName[0] != '\0') |
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106 | { |
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107 | fRhoInputArray = ImportArray(rhoInputArrayName); |
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108 | } |
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109 | else |
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110 | { |
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111 | fRhoInputArray = 0; |
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112 | } |
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113 | |
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114 | // create output array |
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115 | |
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116 | fOutputArray = ExportArray(GetString("OutputArray", "electrons")); |
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117 | } |
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118 | |
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119 | //------------------------------------------------------------------------------ |
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120 | |
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121 | void Isolation::Finish() |
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122 | { |
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123 | if(fFilter) delete fFilter; |
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124 | if(fItCandidateInputArray) delete fItCandidateInputArray; |
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125 | if(fItIsolationInputArray) delete fItIsolationInputArray; |
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126 | } |
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127 | |
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128 | //------------------------------------------------------------------------------ |
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129 | |
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130 | void Isolation::Process() |
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131 | { |
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132 | Candidate *candidate, *isolation; |
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133 | TObjArray *isolationArray; |
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134 | Double_t sumPT, ratio; |
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135 | Int_t counter; |
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136 | Double_t rho = 0.0; |
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137 | |
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138 | if(fRhoInputArray && fRhoInputArray->GetEntriesFast() > 0) |
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139 | { |
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140 | candidate = static_cast<Candidate*>(fRhoInputArray->At(0)); |
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141 | rho = candidate->Momentum.Pt(); |
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142 | } |
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143 | |
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144 | // select isolation objects |
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145 | fFilter->Reset(); |
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146 | isolationArray = fFilter->GetSubArray(fClassifier, 0); |
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147 | |
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148 | if(isolationArray == 0) return; |
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149 | |
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150 | TIter itIsolationArray(isolationArray); |
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151 | |
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152 | // loop over all input jets |
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153 | fItCandidateInputArray->Reset(); |
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154 | while((candidate = static_cast<Candidate*>(fItCandidateInputArray->Next()))) |
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155 | { |
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156 | const TLorentzVector &candidateMomentum = candidate->Momentum; |
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157 | |
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158 | // loop over all input tracks |
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159 | sumPT = 0.0; |
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160 | counter = 0; |
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161 | itIsolationArray.Reset(); |
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162 | while((isolation = static_cast<Candidate*>(itIsolationArray.Next()))) |
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163 | { |
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164 | const TLorentzVector &isolationMomentum = isolation->Momentum; |
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165 | |
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166 | if(candidateMomentum.DeltaR(isolationMomentum) <= fDeltaRMax && |
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167 | !candidate->Overlaps(isolation)) |
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168 | { |
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169 | sumPT += isolationMomentum.Pt(); |
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170 | ++counter; |
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171 | } |
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172 | } |
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173 | |
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174 | // correct sumPT for pile-up contamination |
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175 | sumPT = sumPT - rho*fDeltaRMax*fDeltaRMax*TMath::Pi(); |
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176 | |
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177 | ratio = sumPT/candidateMomentum.Pt(); |
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178 | if(ratio > fPTRatioMax) continue; |
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179 | |
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180 | fOutputArray->Add(candidate); |
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181 | } |
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182 | } |
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183 | |
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184 | //------------------------------------------------------------------------------ |
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