[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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[a0431dc] | 19 | /** \class TrackCountingBTagging
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| 20 | *
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[e4c3fef] | 21 | * b-tagging algorithm based on counting tracks with large impact parameter
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[a0431dc] | 22 | *
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| 23 | * \author M. Selvaggi - UCL, Louvain-la-Neuve
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| 24 | *
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| 25 | */
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| 26 |
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| 27 | #include "modules/TrackCountingBTagging.h"
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| 28 |
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| 29 | #include "classes/DelphesClasses.h"
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| 30 | #include "classes/DelphesFactory.h"
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| 31 | #include "classes/DelphesFormula.h"
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| 32 |
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| 33 | #include "TFormula.h"
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| 34 | #include "TLorentzVector.h"
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[341014c] | 35 | #include "TMath.h"
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| 36 | #include "TObjArray.h"
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| 37 | #include "TRandom3.h"
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| 38 | #include "TString.h"
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[a0431dc] | 39 |
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[e4c3fef] | 40 | #include <algorithm>
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[a0431dc] | 41 | #include <iostream>
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| 42 | #include <sstream>
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[341014c] | 43 | #include <stdexcept>
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[a0431dc] | 44 |
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| 45 | using namespace std;
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| 46 |
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| 47 | //------------------------------------------------------------------------------
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| 48 |
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| 49 | TrackCountingBTagging::TrackCountingBTagging() :
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| 50 | fItTrackInputArray(0), fItJetInputArray(0)
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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 |
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| 56 | TrackCountingBTagging::~TrackCountingBTagging()
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| 57 | {
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| 58 | }
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| 59 |
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| 60 | //------------------------------------------------------------------------------
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| 61 |
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| 62 | void TrackCountingBTagging::Init()
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| 63 | {
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| 64 | fBitNumber = GetInt("BitNumber", 0);
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[e4c3fef] | 65 |
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[6cdc544] | 66 | fPtMin = GetDouble("TrackPtMin", 1.0);
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| 67 | fDeltaR = GetDouble("DeltaR", 0.3);
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| 68 | fIPmax = GetDouble("TrackIPMax", 2.0);
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[e4c3fef] | 69 |
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[6cdc544] | 70 | fSigMin = GetDouble("SigMin", 6.5);
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| 71 | fNtracks = GetInt("Ntracks", 3);
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[e4c3fef] | 72 |
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[e40b9cf] | 73 | fUse3D = GetBool("Use3D", false);
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| 74 |
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[a0431dc] | 75 | // import input array(s)
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| 76 |
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| 77 | fTrackInputArray = ImportArray(GetString("TrackInputArray", "Calorimeter/eflowTracks"));
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| 78 | fItTrackInputArray = fTrackInputArray->MakeIterator();
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[e4c3fef] | 79 |
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[a0431dc] | 80 | fJetInputArray = ImportArray(GetString("JetInputArray", "FastJetFinder/jets"));
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| 81 | fItJetInputArray = fJetInputArray->MakeIterator();
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| 82 | }
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| 83 |
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| 84 | //------------------------------------------------------------------------------
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| 85 |
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| 86 | void TrackCountingBTagging::Finish()
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| 87 | {
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| 88 | if(fItTrackInputArray) delete fItTrackInputArray;
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| 89 | if(fItJetInputArray) delete fItJetInputArray;
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| 90 | }
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| 91 |
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| 92 | //------------------------------------------------------------------------------
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| 93 |
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| 94 | void TrackCountingBTagging::Process()
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| 95 | {
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| 96 | Candidate *jet, *track;
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[e4c3fef] | 97 |
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[e40b9cf] | 98 | Double_t jpx, jpy, jpz;
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[1dad056] | 99 | Double_t dr, tpt;
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[e40b9cf] | 100 | Double_t xd, yd, zd, d0, dd0, dz, ddz, sip;
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[e4c3fef] | 101 |
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[a0431dc] | 102 | Int_t sign;
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[e4c3fef] | 103 |
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[a0431dc] | 104 | Int_t count;
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[e4c3fef] | 105 |
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[a0431dc] | 106 | // loop over all input jets
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| 107 | fItJetInputArray->Reset();
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[341014c] | 108 | while((jet = static_cast<Candidate *>(fItJetInputArray->Next())))
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[a0431dc] | 109 | {
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| 110 | const TLorentzVector &jetMomentum = jet->Momentum;
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| 111 | jpx = jetMomentum.Px();
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| 112 | jpy = jetMomentum.Py();
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[e40b9cf] | 113 | jpz = jetMomentum.Pz();
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[e4c3fef] | 114 |
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[a0431dc] | 115 | // loop over all input tracks
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| 116 | fItTrackInputArray->Reset();
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| 117 | count = 0;
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[9458496b] | 118 | // stop once we have enough tracks
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[341014c] | 119 | while((track = static_cast<Candidate *>(fItTrackInputArray->Next())) and count < fNtracks)
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[a0431dc] | 120 | {
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[e4c3fef] | 121 | const TLorentzVector &trkMomentum = track->Momentum;
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[9458496b] | 122 | tpt = trkMomentum.Pt();
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| 123 | if(tpt < fPtMin) continue;
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[341014c] | 124 |
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[9458496b] | 125 | d0 = TMath::Abs(track->D0);
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| 126 | if(d0 > fIPmax) continue;
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| 127 |
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[e4c3fef] | 128 | dr = jetMomentum.DeltaR(trkMomentum);
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[9458496b] | 129 | if(dr > fDeltaR) continue;
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| 130 |
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[6cdc544] | 131 | xd = track->Xd;
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| 132 | yd = track->Yd;
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[e40b9cf] | 133 | zd = track->Zd;
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| 134 | dd0 = TMath::Abs(track->ErrorD0);
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| 135 | dz = TMath::Abs(track->DZ);
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| 136 | ddz = TMath::Abs(track->ErrorDZ);
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[e4c3fef] | 137 |
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[341014c] | 138 | if(fUse3D)
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| 139 | {
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| 140 | sign = (jpx * xd + jpy * yd + jpz * zd > 0.0) ? 1 : -1;
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[9458496b] | 141 | //add transverse and longitudinal significances in quadrature
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[341014c] | 142 | sip = sign * TMath::Sqrt(TMath::Power(d0 / dd0, 2) + TMath::Power(dz / ddz, 2));
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[e40b9cf] | 143 | }
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[341014c] | 144 | else
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| 145 | {
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| 146 | sign = (jpx * xd + jpy * yd > 0.0) ? 1 : -1;
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[e40b9cf] | 147 | sip = sign * d0 / TMath::Abs(dd0);
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| 148 | }
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[e4c3fef] | 149 |
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| 150 | if(sip > fSigMin) count++;
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[a0431dc] | 151 | }
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[e4c3fef] | 152 |
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[a0431dc] | 153 | // set BTag flag to true if count >= Ntracks
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[e4c3fef] | 154 | jet->BTag |= (count >= fNtracks) << fBitNumber;
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[a0431dc] | 155 | }
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| 156 | }
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| 157 |
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| 158 | //------------------------------------------------------------------------------
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