| 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), fItRhoInputArray(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 | fItRhoInputArray = fRhoInputArray->MakeIterator();
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| 66 |
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| 67 | // create output array(s)
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| 68 |
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| 69 | fOutputArray = ExportArray(GetString("OutputArray", "jets"));
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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 |
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| 75 | void JetPileUpSubtractor::Finish()
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| 76 | {
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| 77 | if(fItRhoInputArray) delete fItRhoInputArray;
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| 78 | if(fItJetInputArray) delete fItJetInputArray;
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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 | void JetPileUpSubtractor::Process()
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| 84 | {
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| 85 | Candidate *candidate, *object;
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| 86 | TLorentzVector momentum, area;
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| 87 | Double_t eta = 0.0;
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| 88 | Double_t rho = 0.0;
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| 89 |
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| 90 | // loop over all input candidates
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| 91 | fItJetInputArray->Reset();
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| 92 | while((candidate = static_cast<Candidate*>(fItJetInputArray->Next())))
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| 93 | {
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| 94 | momentum = candidate->Momentum;
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| 95 | area = candidate->Area;
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| 96 | eta = TMath::Abs(momentum.Eta());
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| 97 |
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| 98 | // find rho
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| 99 | rho = 0.0;
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| 100 | if(fRhoInputArray)
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| 101 | {
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| 102 | fItRhoInputArray->Reset();
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| 103 | while((object = static_cast<Candidate*>(fItRhoInputArray->Next())))
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| 104 | {
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| 105 | if(eta >= object->Edges[0] && eta < object->Edges[1])
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| 106 | {
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| 107 | rho = object->Momentum.Pt();
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| 108 | }
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| 109 | }
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| 110 | }
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| 111 |
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| 112 | // apply pile-up correction
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| 113 | if(momentum.Pt() <= rho * area.Pt()) continue;
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| 114 |
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| 115 | momentum -= rho * area;
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| 116 |
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| 117 | if(momentum.Pt() <= fJetPTMin) continue;
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| 118 |
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| 119 | candidate = static_cast<Candidate*>(candidate->Clone());
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| 120 | candidate->Momentum = momentum;
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| 121 |
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| 122 | fOutputArray->Add(candidate);
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| 123 | }
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| 124 | }
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| 125 |
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| 126 | //------------------------------------------------------------------------------
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