ATLAS Offline Software
Sel2TrkVertices.cxx
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1 /*
2  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
3 */
7 // Header include
8 #include "NewVrtSecInclusiveTool/NewVrtSecInclusiveTool.h"
9 #include "GeoPrimitives/GeoPrimitivesHelpers.h"
10 #include "MVAUtils/BDT.h"
11 //-------------------------------------------------
12 // Other stuff
13 #include "AnalysisUtils/AnalysisMisc.h"
14 #include "TrkVKalVrtFitter/TrkVKalVrtFitter.h"
15 
16 #include "TMath.h"
17 #include "TH1.h"
18 #include "TH2D.h"
19 //
20 
21 
22 namespace Rec{
23 
24 
25 //
26 //
27 //--------------------------------------------------------
28 // Template routine for 2track secondary vertices selection
29 //
30 
31  void NewVrtSecInclusiveTool::select2TrVrt(std::vector<const xAOD::TrackParticle*> & selectedTracks,
32  const xAOD::Vertex & primVrt,
33  std::map<long int,std::vector<double>> & goodVrt,
34  compatibilityGraph_t& compatibilityGraph )
35  const
36  {
37  std::vector<const xAOD::NeutralParticle*> neutralPartDummy(0);
38  std::vector<const xAOD::TrackParticle*> tracksForFit(2,nullptr);
39  std::vector<double> impact,impactError;
40  std::vector<double> inpMass(2,m_massPi);
41  long int Charge;
42  int i,j;
43  StatusCode sc;
44  Vrt2Tr tmpVrt;
45  std::vector<Vrt2Tr> all2TrVrt(0);
46  TLorentzVector PSum2T;
47  Amg::Vector3D iniVrt(0.,0.,0.);
48 //
49  int NTracks = (int) (selectedTracks.size());
50 //
51 // impact parameters with sign calculations
52 //
53  uint8_t nPixelHits;
54  double signifR=0.,signifZ=0.;
55  std::vector<int> nPixHits(NTracks,0);
56  std::vector<double> trackSignif(NTracks),dRdZratio(NTracks);
57  for (i=0; i<NTracks; i++) {
58  m_fitSvc->VKalGetImpact(selectedTracks[i], primVrt.position(), 1, impact, impactError);
59  signifR = impact[0]/ sqrt(impactError[0]);
60  signifZ = impact[1]/ sqrt(impactError[2]);
61  trackSignif[i] = sqrt( signifR*signifR + signifZ*signifZ);
62  dRdZratio[i] = std::abs(signifR/signifZ);
63  if( !(selectedTracks[i]->summaryValue(nPixelHits,xAOD::numberOfPixelHits)) ) nPixelHits=0;
64  nPixHits[i]=nPixelHits;
65  if(m_fillHist){
66  Hists& h = getHists();
67  h.m_hb_impactR->Fill( signifR, m_w_1);
68  h.m_hb_impactZ->Fill( signifZ, m_w_1);
69  h.m_hb_impactRZ->Fill(signifR, signifZ, m_w_1);
70  h.m_hb_impact->Fill( trackSignif[i], m_w_1);
71  if( i<DevTuple::maxNTrk){
72  Hists& h = getHists();
73  h.m_curTup->pttrk[i]=selectedTracks[i]->pt();
74  h.m_curTup->d0trk[i]=selectedTracks[i]->d0();
75  h.m_curTup->Sig3D[i]=trackSignif[i];
76  h.m_curTup->idHF[i] =getIdHF(selectedTracks[i]);
77  h.m_curTup->dRdZrat[i] =dRdZratio[i];
78  h.m_curTup->displaced[i]=isDisplaced(selectedTracks[i]);
79 
80  uint8_t TRTHits;
81  if( !(selectedTracks[i]->summaryValue( TRTHits,xAOD::numberOfTRTHits))) TRTHits=0;
82  h.m_curTup->trkTRT[i] =TRTHits;
83  h.m_curTup->etatrk[i] =selectedTracks[i]->eta();
84  }
85  }
86  }
87 
88  if( m_fillHist ){
89  Hists& h = getHists();
90  h.m_curTup->nTrk=NTracks < DevTuple::maxNTrk ? NTracks : DevTuple::maxNTrk ;
91  h.m_curTup->n2Vrt=0;
92  }
93 
94  std::vector<std::vector<std::tuple<int,float>>> trkCount(NTracks);
95  std::unique_ptr<Trk::IVKalState> state = m_fitSvc->makeState();
96  m_fitSvc->setMassInputParticles( inpMass, *state ); // Use pion masses for fit
97  for (i=0; i<NTracks-1; i++) {
98  if(trackSignif[i]<m_trkSigCut || dRdZratio[i]<m_dRdZRatioCut )continue;
99  for (j=i+1; j<NTracks; j++) {
100  if(trackSignif[j]<m_trkSigCut || dRdZratio[j]<m_dRdZRatioCut )continue;
101  PSum2T=selectedTracks[i]->p4()+selectedTracks[j]->p4();
102  if( std::abs(selectedTracks[i]->eta()-selectedTracks[j]->eta())==0 &&
103  std::abs(selectedTracks[i]->phi()-selectedTracks[j]->phi())==0 &&
104  std::abs(selectedTracks[i]->pt() -selectedTracks[j]->pt())==0 ) continue; //remove duplicated tracks
105  tracksForFit[0]=selectedTracks[i];
106  tracksForFit[1]=selectedTracks[j];
107  double minDZ=0.;
108  sc=m_fitSvc->VKalVrtFitFast(tracksForFit,tmpVrt.fitVertex,minDZ,*state); /* Fast crude estimation*/
109  if( sc.isFailure() ) { /* No initial estimation */
110  iniVrt=primVrt.position();
111  } else {
112  double cosMomVrtDir = projSV_PV(tmpVrt.fitVertex,primVrt,PSum2T);
113  if( cosMomVrtDir>0. ) iniVrt=tmpVrt.fitVertex; /* Good initial estimation */
114  else iniVrt=primVrt.position();
115  }
116  if(nPixHits[i]>0 && nPixHits[j]>0){ if(minDZ> m_fastZSVCut) continue; } // Drop SV candidates with big Z track-track distance.
117  else{ if(minDZ>2.*m_fastZSVCut) continue; } // Drop SV candidates with big Z track-track distance.
118  m_fitSvc->setApproximateVertex(iniVrt.x(), iniVrt.y(), iniVrt.z(), *state);
119  sc=m_fitSvc->VKalVrtFit(tracksForFit, neutralPartDummy, tmpVrt.fitVertex, tmpVrt.momentum, Charge,
120  tmpVrt.errorMatrix, tmpVrt.chi2PerTrk, tmpVrt.trkAtVrt, tmpVrt.chi2, *state, false );
121  if(sc.isFailure()) continue; /* No fit */
122  if(tmpVrt.chi2>20.) continue; /*Too bad Chi2 for nDoF=1 fit*/
125  float vQuality;
126  xAOD::Vertex testV;
127  testV.makePrivateStore();
128  testV.setPosition(tmpVrt.fitVertex);
129  std::vector<float> testVcov(tmpVrt.errorMatrix.begin(),tmpVrt.errorMatrix.end());
130  testV.setCovariance(testVcov);
131  testV.setFitQuality(tmpVrt.chi2,1.);
132  bool acceptV=m_ini_v2trselector->isgood(std::make_pair(selectedTracks[i],selectedTracks[j]), testV,
133  std::make_pair(momAtVrt(tmpVrt.trkAtVrt[0]),momAtVrt(tmpVrt.trkAtVrt[1])), primVrt, vQuality);
134  if(!acceptV) continue; // Main 2-track vertex selection
135 
136 
137 //Check close material layer. Not validated in detail, use with care.
138  double vrtR=tmpVrt.fitVertex.perp();
139  double dstMatSignif=1.e4;
140  if(m_removeTrkMatSignif>0. && vrtR>20.){
141  double vrtRErr=vrtRadiusError(tmpVrt.fitVertex,tmpVrt.errorMatrix );
142  if(vrtR<30.){ dstMatSignif=std::abs(vrtR-m_beampipeR)/vrtRErr;}
143  else { dstMatSignif=distToMatLayerSignificance(tmpVrt);} //Material in Pixel volume
144  if(dstMatSignif<m_removeTrkMatSignif)continue;
145  }
146 //
147 // Debugging and BDT
148  double minPtT = std::min(tracksForFit[0]->pt(),tracksForFit[1]->pt());
149  if( m_fillHist ){
150  float ihitR = selectedTracks[i]->radiusOfFirstHit();
151  float jhitR = selectedTracks[j]->radiusOfFirstHit();
152  int ihitIBL = getIBLHit(selectedTracks[i]);
153  int jhitIBL = getIBLHit(selectedTracks[j]);
154  int ihitBL = getBLHit (selectedTracks[i]);
155  int jhitBL = getBLHit (selectedTracks[j]);
156  double Prob2v=TMath::Prob(tmpVrt.chi2,1);
157  double cosSVPV=projSV_PV(tmpVrt.fitVertex, primVrt, tmpVrt.momentum);
158  ROOT::Math::PxPyPzMVector SVPV(tmpVrt.fitVertex.x()-primVrt.x(),
159  tmpVrt.fitVertex.y()-primVrt.y(),
160  tmpVrt.fitVertex.z()-primVrt.z(), 10.);
161 
162  Hists& h = getHists();
163 
164  if(Charge==0){h.m_hb_massPiPi->Fill(tmpVrt.momentum.M(),1.);}
165  h.m_hb_cosSVMom->Fill(cosSVPV,1.);
166  h.m_hb_etaSV->Fill(SVPV.Eta(),1.);
167 
168  double Sig3D=0.,Sig2D=0., Dist2D=0.;
169  int idisk1=0,idisk2=0,idisk3=0,jdisk1=0,jdisk2=0,jdisk3=0;
170  int sumIBLHits = std::max(ihitIBL,0)+std::max(jhitIBL,0);
171  int sumBLHits = std::max(ihitBL, 0)+std::max(jhitBL, 0);
172  getPixelDiscs(selectedTracks[i],idisk1,idisk2,idisk3);
173  getPixelDiscs(selectedTracks[j],jdisk1,jdisk2,jdisk3);
174  vrtVrtDist(primVrt, tmpVrt.fitVertex, tmpVrt.errorMatrix, Sig3D);
175  Dist2D=vrtVrtDist2D(primVrt, tmpVrt.fitVertex, tmpVrt.errorMatrix, Sig2D);
176  int barVrt1=getProdVrtBarcode(tracksForFit[0],0.1); // FIXME barcode-based
177  int barVrt2=getProdVrtBarcode(tracksForFit[1],0.1); // FIXME barcode-based
178  h.m_hb_signif3D->Fill(Sig3D,1.);
179  h.m_curTup->VrtTrkHF [h.m_curTup->n2Vrt] = getIdHF(tracksForFit[0])+ getIdHF(tracksForFit[1]);
180  h.m_curTup->VrtTrkI [h.m_curTup->n2Vrt] = getG4Inter(tracksForFit[0])+ getG4Inter(tracksForFit[1]);
181  h.m_curTup->VrtTrueBar[h.m_curTup->n2Vrt] = (barVrt1 && barVrt2 && barVrt1==barVrt2) ? 1 : 0;
182  h.m_curTup->VrtTrueNear[h.m_curTup->n2Vrt] = checkTrue2TrVrt(tracksForFit[0],tracksForFit[1],0.1);
183  h.m_curTup->VrtCh [h.m_curTup->n2Vrt] = Charge;
184  h.m_curTup->VrtProb [h.m_curTup->n2Vrt] = Prob2v;
185  h.m_curTup->VrtSig3D [h.m_curTup->n2Vrt] = Sig3D;
186  h.m_curTup->VrtSig2D [h.m_curTup->n2Vrt] = Sig2D;
187  h.m_curTup->VrtDist2D[h.m_curTup->n2Vrt] = vrtR<20. ? Dist2D : vrtR;
188  h.m_curTup->VrtM [h.m_curTup->n2Vrt] = tmpVrt.momentum.M();
189  h.m_curTup->VrtZ [h.m_curTup->n2Vrt] = tmpVrt.fitVertex.z();
190  h.m_curTup->VrtPt [h.m_curTup->n2Vrt] = tmpVrt.momentum.Pt();
191  h.m_curTup->VrtEta [h.m_curTup->n2Vrt] = SVPV.Eta();
192  h.m_curTup->VrtIBL [h.m_curTup->n2Vrt] = sumIBLHits;
193  h.m_curTup->VrtBL [h.m_curTup->n2Vrt] = sumBLHits;
194  h.m_curTup->VrtCosSPM[h.m_curTup->n2Vrt] = cosSVPV;
195  h.m_curTup->VMinPtT [h.m_curTup->n2Vrt] = minPtT;
196  h.m_curTup->VMinS3DT [h.m_curTup->n2Vrt] = std::min(trackSignif[i],trackSignif[j]);
197  h.m_curTup->VMaxS3DT [h.m_curTup->n2Vrt] = std::max(trackSignif[i],trackSignif[j]);
198  h.m_curTup->VrtBDT [h.m_curTup->n2Vrt] = vQuality;
199  h.m_curTup->VrtHR1 [h.m_curTup->n2Vrt] = ihitR;
200  h.m_curTup->VrtHR2 [h.m_curTup->n2Vrt] = jhitR;
201  h.m_curTup->VrtDZ [h.m_curTup->n2Vrt] = minDZ;
202  h.m_curTup->VrtDisk [h.m_curTup->n2Vrt] = idisk1+10*idisk2+20*idisk3+30*jdisk1+40*jdisk2+50*jdisk3;
203  h.m_curTup->VSigMat [h.m_curTup->n2Vrt] = dstMatSignif;
204  h.m_curTup->VrtIT [h.m_curTup->n2Vrt] = i;
205  h.m_curTup->VrtJT [h.m_curTup->n2Vrt] = j;
206  if(h.m_curTup->n2Vrt<DevTuple::maxNVrt-1)h.m_curTup->n2Vrt++;
207  }
208 //
209 //--- Save good candidate for multi-vertex fit
210 //
211  add_edge(i,j,compatibilityGraph);
212  goodVrt[NTracks*i+j]=std::vector<double>{tmpVrt.fitVertex.x(),tmpVrt.fitVertex.y(),tmpVrt.fitVertex.z()};
213  trkCount[i].emplace_back(j,vQuality); trkCount[j].emplace_back(i,vQuality);
214  }
215  }
216  //=== Resolve -!----!- case to speed up cluster finding
217  for(int t=0; t<NTracks; t++){
218  if(trkCount[t].size()==2){
219  i=std::get<0>(trkCount[t][0]);
220  j=std::get<0>(trkCount[t][1]);
221  if(trkCount[i].size()==1 && trkCount[j].size()==1 ){
222  if( std::get<1>(trkCount[t][0]) < std::get<1>(trkCount[t][1]) ) {
223  remove_edge(t,i,compatibilityGraph);
224  if(t<i)goodVrt.erase(NTracks*t+i); else goodVrt.erase(NTracks*i+t);
225  trkCount[i].clear();
226  trkCount[t].erase(trkCount[t].begin()+0);
227  } else {
228  remove_edge(t,j,compatibilityGraph);
229  if(t<j)goodVrt.erase(NTracks*t+j); else goodVrt.erase(NTracks*j+t);
230  trkCount[j].clear();
231  trkCount[t].erase(trkCount[t].begin()+1);
232  }
233  }
234  }
235  }
236 
237  }
238 
239 
240 } //end of namespace
Rec::NewVrtSecInclusiveTool::getIdHF
int getIdHF(const xAOD::TrackParticle *TP) const
Definition: Reconstruction/VKalVrt/NewVrtSecInclusiveTool/src/Utilities.cxx:242
Rec::NewVrtSecInclusiveTool::vrtVrtDist2D
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Definition: Reconstruction/VKalVrt/NewVrtSecInclusiveTool/src/Utilities.cxx:93
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Returns the x position.
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Definition: Reconstruction/VKalVrt/NewVrtSecInclusiveTool/src/Utilities.cxx:214
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