[1367] | 1 |
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| 2 | /** \class TrackCountingBTagging
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| 3 | *
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[1372] | 4 | * b-tagging algorithm based on counting tracks with large impact parameter
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[1367] | 5 | *
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| 6 | * $Date: 2014-03-27 12:39:14 +0200 (Fri, 27 March 2014) $
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| 7 | * $Revision: 1099 $
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| 8 | *
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| 9 | *
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| 10 | * \author M. Selvaggi - UCL, Louvain-la-Neuve
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| 11 | *
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| 12 | */
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| 13 |
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| 14 | #include "modules/TrackCountingBTagging.h"
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| 15 |
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| 16 | #include "classes/DelphesClasses.h"
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| 17 | #include "classes/DelphesFactory.h"
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| 18 | #include "classes/DelphesFormula.h"
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| 19 |
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| 20 | #include "TMath.h"
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| 21 | #include "TString.h"
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| 22 | #include "TFormula.h"
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| 23 | #include "TRandom3.h"
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| 24 | #include "TObjArray.h"
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| 25 | #include "TLorentzVector.h"
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| 26 |
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[1372] | 27 | #include <algorithm>
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[1367] | 28 | #include <stdexcept>
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| 29 | #include <iostream>
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| 30 | #include <sstream>
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| 31 |
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| 32 | using namespace std;
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| 33 |
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| 34 | //------------------------------------------------------------------------------
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| 35 |
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| 36 | TrackCountingBTagging::TrackCountingBTagging() :
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| 37 | fItTrackInputArray(0), fItJetInputArray(0)
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| 38 | {
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| 39 | }
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| 40 |
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| 41 | //------------------------------------------------------------------------------
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| 42 |
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| 43 | TrackCountingBTagging::~TrackCountingBTagging()
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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 |
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| 49 | void TrackCountingBTagging::Init()
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| 50 | {
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| 51 | fBitNumber = GetInt("BitNumber", 0);
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[1372] | 52 |
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[1367] | 53 | fPtMin = GetDouble("TrackPtMin", 1.0);
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| 54 | fDeltaR = GetDouble("DeltaR", 0.3);
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| 55 | fIPmax = GetDouble("TrackIPMax", 2.0);
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[1372] | 56 |
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[1367] | 57 | fSigMin = GetDouble("SigMin", 6.5);
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[1372] | 58 | fNtracks = GetInt("Ntracks", 3);
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| 59 |
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[1367] | 60 | // import input array(s)
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| 61 |
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| 62 | fTrackInputArray = ImportArray(GetString("TrackInputArray", "Calorimeter/eflowTracks"));
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| 63 | fItTrackInputArray = fTrackInputArray->MakeIterator();
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[1372] | 64 |
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[1367] | 65 | fJetInputArray = ImportArray(GetString("JetInputArray", "FastJetFinder/jets"));
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| 66 | fItJetInputArray = fJetInputArray->MakeIterator();
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| 67 | }
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| 68 |
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| 69 | //------------------------------------------------------------------------------
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| 70 |
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| 71 | void TrackCountingBTagging::Finish()
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| 72 | {
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| 73 | if(fItTrackInputArray) delete fItTrackInputArray;
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| 74 | if(fItJetInputArray) delete fItJetInputArray;
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| 75 | }
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| 76 |
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| 77 | //------------------------------------------------------------------------------
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| 78 |
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| 79 | void TrackCountingBTagging::Process()
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| 80 | {
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| 81 | Candidate *jet, *track;
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[1372] | 82 |
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[1367] | 83 | Double_t jpx, jpy;
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| 84 | Double_t dr, tpx, tpy, tpt;
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| 85 | Double_t xd, yd, dxy, ddxy, ip, sip;
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[1372] | 86 |
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[1367] | 87 | Int_t sign;
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[1372] | 88 |
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[1367] | 89 | Int_t count;
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[1372] | 90 |
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[1367] | 91 | // loop over all input jets
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| 92 | fItJetInputArray->Reset();
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| 93 | while((jet = static_cast<Candidate*>(fItJetInputArray->Next())))
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| 94 | {
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| 95 | const TLorentzVector &jetMomentum = jet->Momentum;
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| 96 | jpx = jetMomentum.Px();
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| 97 | jpy = jetMomentum.Py();
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[1372] | 98 |
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[1367] | 99 | // loop over all input tracks
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| 100 | fItTrackInputArray->Reset();
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| 101 | count = 0;
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| 102 | while((track = static_cast<Candidate*>(fItTrackInputArray->Next())))
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| 103 | {
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[1372] | 104 | const TLorentzVector &trkMomentum = track->Momentum;
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| 105 |
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| 106 | dr = jetMomentum.DeltaR(trkMomentum);
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| 107 |
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| 108 | tpt = trkMomentum.Pt();
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| 109 | tpx = trkMomentum.Px();
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| 110 | tpy = trkMomentum.Py();
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| 111 |
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| 112 | xd = track->Xd;
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| 113 | yd = track->Yd;
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| 114 | dxy = TMath::Abs(track->Dxy);
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| 115 | ddxy = track->SDxy;
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| 116 |
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| 117 | if(tpt < fPtMin) continue;
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| 118 | if(dr > fDeltaR) continue;
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| 119 | if(dxy > fIPmax) continue;
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| 120 |
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| 121 | sign = (jpx*xd + jpy*yd > 0.0) ? 1 : -1;
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| 122 |
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| 123 | ip = sign*dxy;
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| 124 | sip = ip / TMath::Abs(ddxy);
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| 125 |
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| 126 | if(sip > fSigMin) count++;
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[1367] | 127 | }
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[1372] | 128 |
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[1367] | 129 | // set BTag flag to true if count >= Ntracks
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[1372] | 130 | jet->BTag |= (count >= fNtracks) << fBitNumber;
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[1367] | 131 | }
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| 132 | }
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| 133 |
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| 134 | //------------------------------------------------------------------------------
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