1 | |
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2 | /** \class JetPileUpSubtractor |
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3 | * |
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4 | * Subtract pile-up contribution from jets using the fastjet area method |
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5 | * |
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6 | * $Date: 2012-11-18 15:57:08 +0100 (Sun, 18 Nov 2012) $ |
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7 | * $Revision: 814 $ |
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8 | * |
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9 | * \author M. Selvaggi - UCL, Louvain-la-Neuve |
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10 | * |
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11 | */ |
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12 | |
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13 | #include "modules/JetPileUpSubtractor.h" |
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14 | |
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15 | #include "classes/DelphesClasses.h" |
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16 | #include "classes/DelphesFactory.h" |
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17 | #include "classes/DelphesFormula.h" |
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18 | |
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19 | #include "ExRootAnalysis/ExRootResult.h" |
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20 | #include "ExRootAnalysis/ExRootFilter.h" |
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21 | #include "ExRootAnalysis/ExRootClassifier.h" |
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22 | |
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23 | #include "TMath.h" |
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24 | #include "TString.h" |
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25 | #include "TFormula.h" |
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26 | #include "TRandom3.h" |
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27 | #include "TObjArray.h" |
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28 | #include "TDatabasePDG.h" |
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29 | #include "TLorentzVector.h" |
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30 | |
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31 | #include <algorithm> |
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32 | #include <stdexcept> |
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33 | #include <iostream> |
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34 | #include <sstream> |
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35 | |
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36 | using namespace std; |
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37 | |
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38 | //------------------------------------------------------------------------------ |
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39 | |
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40 | JetPileUpSubtractor::JetPileUpSubtractor() : |
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41 | fItJetInputArray(0) |
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42 | { |
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43 | |
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44 | } |
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45 | |
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46 | //------------------------------------------------------------------------------ |
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47 | |
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48 | JetPileUpSubtractor::~JetPileUpSubtractor() |
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49 | { |
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50 | |
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51 | } |
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52 | |
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53 | //------------------------------------------------------------------------------ |
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54 | |
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55 | void JetPileUpSubtractor::Init() |
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56 | { |
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57 | fJetPTMin = GetDouble("JetPTMin", 20.0); |
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58 | |
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59 | // import input array(s) |
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60 | |
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61 | fJetInputArray = ImportArray(GetString("JetInputArray", "FastJetFinder/jets")); |
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62 | fItJetInputArray = fJetInputArray->MakeIterator(); |
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63 | |
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64 | fRhoInputArray = ImportArray(GetString("RhoInputArray", "Rho/rho")); |
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65 | |
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66 | // create output array(s) |
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67 | |
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68 | fOutputArray = ExportArray(GetString("OutputArray", "jets")); |
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69 | |
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70 | } |
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71 | |
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72 | //------------------------------------------------------------------------------ |
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73 | |
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74 | void JetPileUpSubtractor::Finish() |
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75 | { |
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76 | if(fItJetInputArray) delete fItJetInputArray; |
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77 | } |
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78 | |
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79 | //------------------------------------------------------------------------------ |
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80 | |
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81 | void JetPileUpSubtractor::Process() |
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82 | { |
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83 | Candidate *candidate; |
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84 | TLorentzVector momentum, area; |
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85 | Double_t rho = 0.0; |
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86 | |
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87 | if(fRhoInputArray && fRhoInputArray->GetEntriesFast() > 0) |
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88 | { |
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89 | candidate = static_cast<Candidate*>(fRhoInputArray->At(0)); |
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90 | rho = candidate->Momentum.Pt(); |
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91 | } |
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92 | |
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93 | // loop over all input candidates |
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94 | fItJetInputArray->Reset(); |
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95 | while((candidate = static_cast<Candidate*>(fItJetInputArray->Next()))) |
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96 | { |
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97 | momentum = candidate->Momentum; |
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98 | area = candidate->Area; |
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99 | |
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100 | // apply pile-up correction |
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101 | if(momentum.Pt() <= rho * area.Pt()) continue; |
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102 | |
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103 | momentum -= rho * area; |
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104 | |
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105 | if(momentum.Pt() <= fJetPTMin) continue; |
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106 | |
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107 | candidate = static_cast<Candidate*>(candidate->Clone()); |
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108 | candidate->Momentum = momentum; |
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109 | |
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110 | fOutputArray->Add(candidate); |
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111 | } |
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112 | } |
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113 | |
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114 | //------------------------------------------------------------------------------ |
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