[b443089] | 1 | /*
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| 2 | * Delphes: a framework for fast simulation of a generic collider experiment
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| 3 | * Copyright (C) 2012-2014 Universite catholique de Louvain (UCL), Belgium
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[1fa50c2] | 4 | *
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[b443089] | 5 | * This program is free software: you can redistribute it and/or modify
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| 6 | * it under the terms of the GNU General Public License as published by
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| 7 | * the Free Software Foundation, either version 3 of the License, or
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| 8 | * (at your option) any later version.
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[1fa50c2] | 9 | *
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[b443089] | 10 | * This program is distributed in the hope that it will be useful,
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | * GNU General Public License for more details.
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[1fa50c2] | 14 | *
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[b443089] | 15 | * You should have received a copy of the GNU General Public License
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| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 17 | */
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| 18 |
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[d7d2da3] | 19 |
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| 20 | /** \class TauTagging
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| 21 | *
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| 22 | * Determines origin of jet,
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| 23 | * applies b-tagging efficiency (miss identification rate) formulas
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| 24 | * and sets b-tagging flags
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| 25 | *
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| 26 | * \author P. Demin - UCL, Louvain-la-Neuve
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| 27 | *
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| 28 | */
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| 29 |
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| 30 | #include "modules/TauTagging.h"
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| 31 |
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| 32 | #include "classes/DelphesClasses.h"
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| 33 | #include "classes/DelphesFactory.h"
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| 34 | #include "classes/DelphesFormula.h"
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| 35 |
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| 36 | #include "TMath.h"
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| 37 | #include "TString.h"
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| 38 | #include "TFormula.h"
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| 39 | #include "TRandom3.h"
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| 40 | #include "TObjArray.h"
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| 41 | #include "TDatabasePDG.h"
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| 42 | #include "TLorentzVector.h"
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| 43 |
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| 44 | #include <algorithm>
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| 45 | #include <stdexcept>
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| 46 | #include <iostream>
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| 47 | #include <sstream>
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| 48 |
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| 49 | using namespace std;
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| 50 |
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| 51 |
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| 52 | //------------------------------------------------------------------------------
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| 53 | TauTaggingPartonClassifier::TauTaggingPartonClassifier(const TObjArray *array) :
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| 54 | fParticleInputArray(array)
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| 55 | {
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| 56 | }
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| 57 |
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| 58 | //------------------------------------------------------------------------------
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| 59 |
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| 60 | Int_t TauTaggingPartonClassifier::GetCategory(TObject *object)
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| 61 | {
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| 62 | Candidate *tau = static_cast<Candidate *>(object);
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[50d7259] | 63 | Candidate *daughter1 = 0;
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| 64 | Candidate *daughter2 = 0;
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| 65 |
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[d7d2da3] | 66 | const TLorentzVector &momentum = tau->Momentum;
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[50d7259] | 67 | Int_t pdgCode, i, j;
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[d7d2da3] | 68 |
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| 69 | pdgCode = TMath::Abs(tau->PID);
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| 70 | if(pdgCode != 15) return -1;
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| 71 |
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| 72 | if(momentum.Pt() <= fPTMin || TMath::Abs(momentum.Eta()) > fEtaMax) return -1;
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| 73 |
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| 74 | if(tau->D1 < 0) return -1;
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| 75 |
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[8ab9694] | 76 | if(tau->D2 < tau->D1) return -1;
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| 77 |
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[6c565cc] | 78 | if(tau->D1 >= fParticleInputArray->GetEntriesFast() ||
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| 79 | tau->D2 >= fParticleInputArray->GetEntriesFast())
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| 80 | {
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| 81 | throw runtime_error("tau's daughter index is greater than the ParticleInputArray size");
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| 82 | }
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| 83 |
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[d7d2da3] | 84 | for(i = tau->D1; i <= tau->D2; ++i)
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| 85 | {
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[50d7259] | 86 | daughter1 = static_cast<Candidate *>(fParticleInputArray->At(i));
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| 87 | pdgCode = TMath::Abs(daughter1->PID);
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| 88 | if(pdgCode == 11 || pdgCode == 13 || pdgCode == 15) return -1;
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| 89 | else if(pdgCode == 24)
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| 90 | {
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| 91 | if(daughter1->D1 < 0) return -1;
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| 92 | for(j = daughter1->D1; j <= daughter1->D2; ++j)
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| 93 | {
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| 94 | daughter2 = static_cast<Candidate*>(fParticleInputArray->At(j));
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| 95 | pdgCode = TMath::Abs(daughter2->PID);
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| 96 | if(pdgCode == 11 || pdgCode == 13) return -1;
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| 97 | }
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| 98 |
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| 99 | }
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[d7d2da3] | 100 | }
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| 101 |
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| 102 | return 0;
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| 103 | }
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| 104 |
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| 105 | //------------------------------------------------------------------------------
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| 106 |
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| 107 | TauTagging::TauTagging() :
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| 108 | fClassifier(0), fFilter(0),
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| 109 | fItPartonInputArray(0), fItJetInputArray(0)
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| 110 | {
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| 111 | }
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| 112 |
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| 113 | //------------------------------------------------------------------------------
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| 114 |
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| 115 | TauTagging::~TauTagging()
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| 116 | {
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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 TauTagging::Init()
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| 122 | {
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| 123 | map< Int_t, DelphesFormula * >::iterator itEfficiencyMap;
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| 124 | ExRootConfParam param;
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| 125 | DelphesFormula *formula;
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| 126 | Int_t i, size;
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| 127 |
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[7e227ae] | 128 | fBitNumber = GetInt("BitNumber", 0);
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| 129 |
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[d7d2da3] | 130 | fDeltaR = GetDouble("DeltaR", 0.5);
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| 131 |
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| 132 | // read efficiency formulas
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| 133 | param = GetParam("EfficiencyFormula");
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| 134 | size = param.GetSize();
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| 135 |
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| 136 | fEfficiencyMap.clear();
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| 137 | for(i = 0; i < size/2; ++i)
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| 138 | {
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| 139 | formula = new DelphesFormula;
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| 140 | formula->Compile(param[i*2 + 1].GetString());
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| 141 |
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| 142 | fEfficiencyMap[param[i*2].GetInt()] = formula;
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| 143 | }
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| 144 |
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| 145 | // set default efficiency formula
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| 146 | itEfficiencyMap = fEfficiencyMap.find(0);
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| 147 | if(itEfficiencyMap == fEfficiencyMap.end())
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| 148 | {
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| 149 | formula = new DelphesFormula;
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| 150 | formula->Compile("0.0");
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| 151 |
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| 152 | fEfficiencyMap[0] = formula;
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| 153 | }
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| 154 |
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| 155 | // import input array(s)
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| 156 |
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| 157 | fParticleInputArray = ImportArray(GetString("ParticleInputArray", "Delphes/allParticles"));
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| 158 |
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| 159 | fClassifier = new TauTaggingPartonClassifier(fParticleInputArray);
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| 160 | fClassifier->fPTMin = GetDouble("TauPTMin", 1.0);
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| 161 | fClassifier->fEtaMax = GetDouble("TauEtaMax", 2.5);
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| 162 |
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| 163 | fPartonInputArray = ImportArray(GetString("PartonInputArray", "Delphes/partons"));
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| 164 | fItPartonInputArray = fPartonInputArray->MakeIterator();
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| 165 |
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| 166 | fFilter = new ExRootFilter(fPartonInputArray);
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| 167 |
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| 168 | fJetInputArray = ImportArray(GetString("JetInputArray", "FastJetFinder/jets"));
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| 169 | fItJetInputArray = fJetInputArray->MakeIterator();
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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::Finish()
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| 175 | {
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| 176 | map< Int_t, DelphesFormula * >::iterator itEfficiencyMap;
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| 177 | DelphesFormula *formula;
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| 178 |
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| 179 | if(fFilter) delete fFilter;
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| 180 | if(fClassifier) delete fClassifier;
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| 181 | if(fItJetInputArray) delete fItJetInputArray;
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| 182 | if(fItPartonInputArray) delete fItPartonInputArray;
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| 183 |
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| 184 | for(itEfficiencyMap = fEfficiencyMap.begin(); itEfficiencyMap != fEfficiencyMap.end(); ++itEfficiencyMap)
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| 185 | {
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| 186 | formula = itEfficiencyMap->second;
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| 187 | if(formula) delete formula;
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| 188 | }
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| 189 | }
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| 190 |
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| 191 | //------------------------------------------------------------------------------
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| 192 |
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| 193 | void TauTagging::Process()
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| 194 | {
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[f229d8a] | 195 | Candidate *jet, *tau, *daughter;
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| 196 | TLorentzVector tauMomentum;
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[7e227ae] | 197 | Double_t pt, eta, phi, e;
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[d7d2da3] | 198 | TObjArray *tauArray;
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| 199 | map< Int_t, DelphesFormula * >::iterator itEfficiencyMap;
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| 200 | DelphesFormula *formula;
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[f229d8a] | 201 | Int_t pdgCode, charge, i;
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[d7d2da3] | 202 |
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| 203 | // select taus
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| 204 | fFilter->Reset();
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| 205 | tauArray = fFilter->GetSubArray(fClassifier, 0);
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| 206 |
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| 207 | // loop over all input jets
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| 208 | fItJetInputArray->Reset();
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| 209 | while((jet = static_cast<Candidate *>(fItJetInputArray->Next())))
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| 210 | {
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| 211 | const TLorentzVector &jetMomentum = jet->Momentum;
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| 212 | pdgCode = 0;
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| 213 | charge = gRandom->Uniform() > 0.5 ? 1 : -1;
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| 214 | eta = jetMomentum.Eta();
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| 215 | phi = jetMomentum.Phi();
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| 216 | pt = jetMomentum.Pt();
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[7e227ae] | 217 | e = jetMomentum.E();
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[d7d2da3] | 218 |
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| 219 | // loop over all input taus
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[69bf964] | 220 | if(tauArray){
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| 221 | TIter itTauArray(tauArray);
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| 222 | while((tau = static_cast<Candidate *>(itTauArray.Next())))
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[d7d2da3] | 223 | {
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[69bf964] | 224 | if(tau->D1 < 0) continue;
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| 225 |
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| 226 | if(tau->D1 >= fParticleInputArray->GetEntriesFast() ||
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| 227 | tau->D2 >= fParticleInputArray->GetEntriesFast())
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| 228 | {
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| 229 | throw runtime_error("tau's daughter index is greater than the ParticleInputArray size");
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| 230 | }
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| 231 |
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| 232 | tauMomentum.SetPxPyPzE(0.0, 0.0, 0.0, 0.0);
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| 233 |
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| 234 | for(i = tau->D1; i <= tau->D2; ++i)
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| 235 | {
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| 236 | daughter = static_cast<Candidate *>(fParticleInputArray->At(i));
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| 237 | if(TMath::Abs(daughter->PID) == 16) continue;
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| 238 | tauMomentum += daughter->Momentum;
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| 239 | }
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| 240 |
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| 241 | if(jetMomentum.DeltaR(tauMomentum) <= fDeltaR)
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| 242 | {
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| 243 | pdgCode = 15;
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| 244 | charge = tau->Charge;
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| 245 | }
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[d7d2da3] | 246 | }
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| 247 | }
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| 248 | // find an efficency formula
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| 249 | itEfficiencyMap = fEfficiencyMap.find(pdgCode);
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| 250 | if(itEfficiencyMap == fEfficiencyMap.end())
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| 251 | {
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| 252 | itEfficiencyMap = fEfficiencyMap.find(0);
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| 253 | }
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| 254 | formula = itEfficiencyMap->second;
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| 255 |
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| 256 | // apply an efficency formula
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[7e227ae] | 257 | jet->TauTag |= (gRandom->Uniform() <= formula->Eval(pt, eta, phi, e)) << fBitNumber;
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| 258 |
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[d7d2da3] | 259 | // set tau charge
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| 260 | jet->Charge = charge;
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| 261 | }
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| 262 | }
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| 263 |
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| 264 | //------------------------------------------------------------------------------
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