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testPHGenFit.cc
Go to the documentation of this file. Or view the newest version in sPHENIX GitHub for file testPHGenFit.cc
1 
7 //STL
8 #include <vector>
9 
10 //BOOST
11 #include<boost/make_shared.hpp>
12 
13 #define SMART(expr) boost::shared_ptr<expr>
14 #define NEW(expr) boost::make_shared<expr>
15 
16 #include <phfield/PHFieldUtility.h>
17 
18 //ROOT
19 #include <TVector3.h>
20 #include <TMatrixDSym.h>
21 #include <TF1.h>
22 #include <TH1D.h>
23 #include <TH2D.h>
24 #include <TProfile.h>
25 #include <TFile.h>
26 #include <TTree.h>
27 #include <TCanvas.h>
28 #include <TROOT.h>
29 #include <TStyle.h>
30 #include <TMath.h>
31 #include <TRandom.h>
32 
33 //GenFit
34 #include <GenFit/AbsTrackRep.h>
35 #include <GenFit/RKTrackRep.h>
36 #include <GenFit/StateOnPlane.h>
37 
38 //PHGenFit
39 #include <phgenfit/Fitter.h>
40 #include <phgenfit/Track.h>
41 #include <phgenfit/Measurement.h>
42 #include <phgenfit/PlanarMeasurement.h>
43 
44 #define LogDEBUG std::cout<<"DEBUG: "<<__LINE__<<"\n"
45 
46 //void pause() {
47 // std::cout << "Press ENTER to continue..." << std::flush;
48 // std::cin.clear(); // use only if a human is involved
49 // std::cin.flush(); // use only if a human is involved
50 // std::cin.ignore( std::numeric_limits<std::streamsize>::max(), '\n' );
51 //}
52 
53 int main(int argc, char**argv) {
54 
55  TFile *fPHG4Hits = TFile::Open("AnaSvtxTracksForGenFit.root", "read");
56  if (!fPHG4Hits) {
57  std::cout << "No TFile Openned: " << __LINE__ << "\n";
58  return -1;
59  }
60  TTree *T = (TTree*) fPHG4Hits->Get("tracks");
61  if (!T) {
62  std::cout << "No TTree Found: " << __LINE__ << "\n";
63  return -1;
64  }
65 
67  PHGenFit::Fitter* fitter = new PHGenFit::Fitter("sPHENIX_Geo.root",PHFieldUtility::BuildFieldMap(PHFieldUtility::DefaultFieldConfig(), 1));
68 
69 
70  double resolution_detector_xy = 0.005/3.; //50/3. micron
71 
72 
73  TH2D *hpT_residual_vs_pT = new TH2D("hpT_residual_vs_pT", "#Delta pT/pT; pT[GeV/c]; #Delta pT/pT", 40, 0.5, 40.5, 1000, -1, 1);
74 
75  TH2D *hDCAr_vs_pT = new TH2D("hDCAr_vs_pT", "DCAr vs. p; p [GeV/c]; DCAr [cm]", 40, 0.5, 40.5, 1000, -0.1, 0.1);
76 
77 
78 #define NLAYERS 7
79 
80 
81  Float_t Cluster_x[NLAYERS];
82  Float_t Cluster_y[NLAYERS];
83  Float_t Cluster_z[NLAYERS];
84  Float_t Cluster_size_dphi[NLAYERS];
85  Float_t Cluster_size_dz[NLAYERS];
86  Float_t True_px;
87  Float_t True_py;
88  Float_t True_pz;
89  Float_t True_vx;
90  Float_t True_vy;
91  Float_t True_vz;
92  Float_t AlanDion_px;
93  Float_t AlanDion_py;
94  Float_t AlanDion_pz;
95  Float_t AlanDion_dca2d;
96  Int_t nhits;
97 
98  T->SetBranchAddress("nhits", &nhits);
99  T->SetBranchAddress("gpx", &True_px);
100  T->SetBranchAddress("gpy", &True_py);
101  T->SetBranchAddress("gpz", &True_pz);
102  T->SetBranchAddress("gvx", &True_vx);
103  T->SetBranchAddress("gvy", &True_vy);
104  T->SetBranchAddress("gvz", &True_vz);
105  T->SetBranchAddress("px", &AlanDion_px);
106  T->SetBranchAddress("py", &AlanDion_py);
107  T->SetBranchAddress("pz", &AlanDion_pz);
108  T->SetBranchAddress("dca2d", &AlanDion_dca2d);
109  T->SetBranchAddress("x", Cluster_x);
110  T->SetBranchAddress("y", Cluster_y);
111  T->SetBranchAddress("z", Cluster_z);
112  T->SetBranchAddress("size_dphi", Cluster_size_dphi);
113  T->SetBranchAddress("size_dz", Cluster_size_dz);
114 
115  double nentries = 10;
116  //double nentries = T->GetEntries();
117  for (unsigned int ientry = 0; ientry < nentries; ++ientry) {
118  //T->GetEntry(atoi(argv[1]));
119  if(ientry%1000==0) std::cout<<"Processing: "<<100.*ientry/nentries <<"%"<<"\n";
120 
121  T->GetEntry(ientry);
122 
123  if (nhits < 0) {
124  //LogDEBUG;
125  continue;
126  }
127 
128  // true start values
129  TVector3 init_pos(0, 0, 0); //cm
130  TVector3 True_mom(True_px, True_py, True_pz);
131 
132  // Seed: use smeared values
133  const bool smearPosMom = true; // init the Reps with smeared init_pos and True_mom
134  const double posSmear = 10 * resolution_detector_xy; // cm
135  const double momSmear = 3. / 180. * TMath::Pi(); // rad
136  const double momMagSmear = 0.1; // relative
137 
138  TVector3 seed_pos(init_pos);
139  TVector3 seed_mom(True_mom);
140  if (smearPosMom) {
141  seed_pos.SetX(gRandom->Gaus(seed_pos.X(), posSmear));
142  seed_pos.SetY(gRandom->Gaus(seed_pos.Y(), posSmear));
143  seed_pos.SetZ(gRandom->Gaus(seed_pos.Z(), posSmear));
144 
145  seed_mom.SetPhi(gRandom->Gaus(True_mom.Phi(), momSmear));
146  seed_mom.SetTheta(gRandom->Gaus(True_mom.Theta(), momSmear));
147  seed_mom.SetMag(
148  gRandom->Gaus(True_mom.Mag(),
149  momMagSmear * True_mom.Mag()));
150  }
151 
152  // approximate covariance
153  TMatrixDSym seed_cov(6);
154 
155  for (int idim = 0; idim < 3; ++idim)
156  seed_cov(idim, idim) = resolution_detector_xy
157  * resolution_detector_xy;
158  for (int idim = 3; idim < 6; ++idim)
159  seed_cov(idim, idim) = pow(
160  resolution_detector_xy / NLAYERS / sqrt(3), 2);
161 
162 
164  int pid = -13; //mu+
165  //SMART(genfit::AbsTrackRep) rep = NEW(genfit::RKTrackRep)(pid);
166  genfit::AbsTrackRep* rep = new genfit::RKTrackRep(pid);
167 
169  PHGenFit::Track* track = new PHGenFit::Track(rep, seed_pos,
170  seed_mom, seed_cov);
171 
173  std::vector<PHGenFit::Measurement*> measurements;
174  for (int imeas = 0; imeas < NLAYERS; imeas++) {
175  TVector3 pos(Cluster_x[imeas],Cluster_y[imeas],Cluster_z[imeas]);
176  TVector3 n(Cluster_x[imeas],Cluster_y[imeas],0);
177  TVector3 v(0,0,1);
178  TVector3 u = v.Cross(n);
179 
180  PHGenFit::Measurement* meas = new PHGenFit::PlanarMeasurement(
181  pos,u,v,
182  Cluster_size_dphi[imeas],Cluster_size_dz[imeas]);
183  measurements.push_back(meas);
184  }
185 
187  track->addMeasurements(measurements);
188 
190  fitter->processTrack(track, false);
191 
193  genfit::MeasuredStateOnPlane* state_at_beam_line = track->extrapolateToLine(
194  TVector3(0, 0, 0), TVector3(0, 0, 1));
195  //state_at_beam_line->Print();
196 
197 // genfit::MeasuredStateOnPlane* state_at_layer_6 = track->extrapolateToCylinder(80.,
198 // TVector3(0, 0, 0), TVector3(0, 0, 1));
199 // //state_at_layer_6->Print();
200 // delete state_at_layer_6;
201 
202 
203  TVector3 GenFit_mom = state_at_beam_line->getMom();
204 
205  TVector3 AlanDion_mom(AlanDion_px,AlanDion_py,AlanDion_pz);
206 
207  hpT_residual_vs_pT->Fill(True_mom.Pt(),(GenFit_mom.Pt() - True_mom.Pt())/True_mom.Pt());
208 
209  hDCAr_vs_pT->Fill(True_mom.Mag(),state_at_beam_line->getState()[3]);
210 
211  delete state_at_beam_line;
212  delete track;
213  measurements.clear();
214  }
215 
216  gStyle->SetOptFit();
217  gStyle->SetOptStat(000000000);
218 
219  TF1 *tf_pT_resolution = new TF1("tf_pT_resolution","sqrt([0]*[0] + x*x*[1]*[1])", 0, 40);
220  tf_pT_resolution->SetParameters(0,0);
221  TCanvas *c3 = new TCanvas("c3","c3");
222  c3->Divide(2,1);
223  c3->cd(1);
224  hpT_residual_vs_pT->FitSlicesY();
225  TH1D *hpT_resolution_vs_pT = (TH1D*)gDirectory->Get("hpT_residual_vs_pT_2");
226  hpT_resolution_vs_pT->SetTitle("PHGenFit: #sigma_{p_{T}}/p_{T}; p_{T}[GeV/c]; #sigma_{p_{T}}/p_{T}");
227  hpT_resolution_vs_pT->SetMarkerStyle(20);
228  hpT_resolution_vs_pT->Draw("e");
229  hpT_resolution_vs_pT->Fit(tf_pT_resolution);
230  c3->cd(2);
231  hDCAr_vs_pT->FitSlicesY();
232  TH1D *hDCAr_resolution_vs_pT = (TH1D*) gDirectory->Get("hDCAr_vs_pT_2");
233  hDCAr_resolution_vs_pT->SetTitle(
234  "PHGenFit: #sigma_{DCAr} [cm]; p [GeV/c]; #sigma_{DCAr}");
235  hDCAr_resolution_vs_pT->SetMarkerStyle(20);
236  hDCAr_resolution_vs_pT->Draw("e");
237  //hDCAr_resolution_vs_pT->Fit(tf_pT_resolution);
238  c3->Print("pT_DCA_resolution.root");
239 
241  //fitter->displayEvent();
242 
243  fPHG4Hits->Close();
244 
245  delete fitter;
246 
247  //pause();
248 
249  std::cout<<"SUCCESS! \n";
250 
251  return 0;
252 }