コード例 #1
0
double read() {


  TRandom R;
  TStopwatch timer;


  TH1D * h1 = new TH1D("h1","total event  energy ",100,0,1000.);
  TH1D * h2 = new TH1D("h2","Number of track per event",21,-0.5,20.5);
  TH1D * h3 = new TH1D("h3","Track Energy",100,0,200);
  TH1D * h4 = new TH1D("h4","Track Pt",100,0,100);
  TH1D * h5 = new TH1D("h5","Track Eta",100,-5,5);
  TH1D * h6 = new TH1D("h6","Track Cos(theta)",100,-1,1);


  TFile f1("mathcoreLV.root");

  // create tree
  TTree *t1 = (TTree*)f1.Get("t1");

  std::vector<ROOT::Math::LorentzVector<ROOT::Math::PxPyPzE4D<double> > > * pTracks = 0;
  t1->SetBranchAddress("tracks",&pTracks);

  timer.Start();
  int n = (int) t1->GetEntries();
  std::cout << " Tree Entries " << n << std::endl;
  double sum=0;
  for (int i = 0; i < n; ++i) {
    t1->GetEntry(i);
    int ntrk = pTracks->size();
    h3->Fill(ntrk);
    XYZTVector q;
    for (int j = 0; j < ntrk; ++j) {
      XYZTVector v = (*pTracks)[j];
      q += v;
      h3->Fill(v.E());
      h4->Fill(v.Pt());
      h5->Fill(v.Eta());
      h6->Fill(cos(v.Theta()));
      sum += v.x() + v.y() + v.z() + v.t();
    }
    h1->Fill(q.E() );
    h2->Fill(ntrk);
  }


  timer.Stop();
  std::cout << " Time for new Vector " << timer.RealTime() << "  " << timer.CpuTime() << std::endl;



  TCanvas *c1 = new TCanvas("c1","demo of Trees",10,10,600,800);
  c1->Divide(2,3);

  c1->cd(1);
  h1->Draw();
  c1->cd(2);
  h2->Draw();
  c1->cd(3);
  h3->Draw();
  c1->cd(3);
  h3->Draw();
  c1->cd(4);
  h4->Draw();
  c1->cd(5);
  h5->Draw();
  c1->cd(6);
  h6->Draw();

  return sum;
}
コード例 #2
0
void track_selection_tree_1()
{
   //gROOT->ProcessLine(".L Loader.C+");

    // attach "UETree/data" of tree1.root as the main root file for this program
    TFile *myFile = TFile::Open("tree1.root", "READ");
    TTree* tree = (TTree*)myFile->Get("UETree/data");

    //for this dataset we want lumisection of 90 and above
    //data from branch 62
    int nlumi_section;
    tree->SetBranchAddress("lumi", &nlumi_section);

    int iZeroBias; //data from Branch 60
    tree->SetBranchAddress("trgZeroBias",&iZeroBias);

    //variables to check if there is only 1 vertex
    vector<float> *fvecVtxz = 0; //require initialisation to 0 to avoid crash
    tree->SetBranchAddress("vtxz",&fvecVtxz);
    float fvecVtxz_size;

    //variables to check for within 15cm
    vector<float> *fvecVtxzBS = 0; //from branch 54
    tree->SetBranchAddress("vtxzBS", &fvecVtxzBS);
    float nBeamSize;

    vector<ROOT::Math::LorentzVector<ROOT::Math::PxPyPzE4D<double> > > *tracks = 0;
    tree->SetBranchAddress("recoTracksp4", &tracks);
    //vector<TLorentzVector> *tracks = new vector<TLorentzVector>;

    vector<float> *fVec_dz = 0;
    tree->SetBranchAddress ("recoTracksdz", &fVec_dz);
    vector<float> *fVec_dzErr = 0;
    tree->SetBranchAddress ("recoTracksdzErr", &fVec_dzErr);

    vector<float> *fVec_d0 = 0;
    tree->SetBranchAddress ("recoTracksd0", &fVec_d0);
    vector<float> *fVec_d0Err = 0;
    tree->SetBranchAddress ("recoTracksd0Err", &fVec_d0Err);

    vector<float> *fVec_ptErr = 0;
    tree->SetBranchAddress("recoTracksptErr", &fVec_ptErr);

    vector<int> *nVec_HighPurity = 0;
    tree->SetBranchAddress ("recoTrackshighPurity", &nVec_HighPurity);

    //declare variable to hold track number
    int ntrk, nMulti;
    int ntrk_normalized = 0;
    int nHigh_Purity = 0;
    float dz_dzErr, d0_d0Err, pt_ptErr;

    const int lumi_cut = 90;
    const double eta_cut = 2.4;
    const double pt_cut = 0.5;
    const double vtxz_number = 1.;
    const double vtxz_size = 10;
    const int ntracks = 533084;


    TCanvas *canvas = new TCanvas;
    //TH1F *event_histo = new TH1F ("reco_evt", "reco_evt", 100, 0, 200);
    TH1F *pt_histo = new TH1F ("reco_pt", "Normalized_reco_pT", 100, 0, 100);
    TH1F *eta_histo = new TH1F ("reco_eta", "Normalized_reco_Eta", 25, -3, 3);
    TH1F *phi_histo = new TH1F ("reco_phi", "Normalized_reco_Phi", 100, -4, 4);
    TH1F *lumi_histo = new TH1F ("lumi_section", "lumi_section", 160, 80, 230);
    TH1F *multiplicity = new TH1F ("multiplicity", "Normalized_Multiplicity", 200, 0, 200);
    TH1F *dz_sigmadz = new TH1F ("dz_sigmadz", "Normalized_dz_sigmadz", 200, 0, 200);
    TH1F *d0_sigmad0 = new TH1F ("d0_sigmad0", "Normalized_d0_sigmad0", 200, 0, 200);
    TH1F *pt_sigmapt = new TH1F ("pt_sigmapt", "Normalized_pt_sigmapt", 200, 0, 200);
    //TH1F *normalized_multiplicity_histo = new TH1F ("normalized_multiplicity", "normalized_multiplicity", 200, 0, 200);

    //select events with only 1 vertex using information from Branch 46/47/48. Here we use Branch 48 (z-axis)
    Int_t nEvt = (Int_t)tree->GetEntries();
    cout << "Tree Entries " << nEvt << endl;


    //start loop over events
    for(Int_t i = 0; i < nEvt; ++i)
    {
        //if (i%10000 == 0)
            //cout<< "Processing event number: " << i << endl; //1 TTree entry = 1 event
        cout << "Entry " << i << endl;
        tree -> GetEntry(i);
        cout << "set branch address for zero bias" << endl;

        //selects for events from lumisection >= 90
        if (nlumi_section >= lumi_cut)
        {
            cout << "lumisection is " << nlumi_section << endl;


            //we select only events that are triggered by ZeroBias Trigger. "True" in ZeroBias evaluate to 1
            if (iZeroBias == 1)
            {
                cout << "track pass zero bias" << endl;
                fvecVtxz_size = fvecVtxz->size();
                //vtxz_plot->Fill(fvecVtxz_size);

                if (fvecVtxz_size == vtxz_number)
                {
                    cout << "number of vertex for event " << i << " is " << fvecVtxz_size << endl;

                    //looping over vertices
                    for (int k = 0; k != fvecVtxz_size; ++k)
                    {
                        nBeamSize = fabs((*fvecVtxz)[k] - (*fvecVtxzBS)[0]);
                        cout << "Beam Size is " << nBeamSize << endl;

                        if (nBeamSize <= vtxz_size)
                        {
                            ntrk = tracks->size();

                            //fill with the lumi sections that meet the above event-level cuts
                            lumi_histo->Fill(nlumi_section);

                            nMulti = 0;

                            //looping over tracks
                            for (int j = 0; j != ntrk; ++j)
                            {
                                XYZTVector vec = (*tracks)[j];
                                dz_dzErr = ((*fVec_dz)[j])/((*fVec_dzErr)[j]);
                                d0_d0Err = ((*fVec_d0)[j])/((*fVec_d0Err)[j]);
                                pt_ptErr = ((vec.Pt())/(*fVec_ptErr)[j]);

                                if ((*nVec_HighPurity)[j] == 1)
                                {
                                    if (abs (vec.Eta()) <= eta_cut && vec.Pt() >= pt_cut)
                                    {
                                        phi_histo->Fill(vec.Phi());
                                        pt_histo->Fill(vec.Pt());
                                        eta_histo->Fill(vec.Eta());
                                        dz_sigmadz->Fill(dz_dzErr);
                                        d0_sigmad0->Fill(d0_d0Err);
                                        pt_sigmapt->Fill(pt_ptErr);
                                        ++nMulti;
                                    }
                                    ++nHigh_Purity;
                                }



                                /*if (abs (vec.Eta()) <= eta_cut && vec.Pt() >= pt_cut)
                                {
                                    pt_histo->Fill(vec.Pt());
                                }

                                if (vec.Pt() >= pt_cut)
                                {
                                    eta_histo->Fill(vec.Eta());
                                }*/


                            }

                            multiplicity->Fill(nMulti);
                            ntrk_normalized += nMulti;
                        }


                    }

                }

            }

        }

    }

    cout << "Total number of selected tracks is " << ntrk_normalized << endl;

//vtxz_plot->Draw();
//canvas->Update();
//canvas->SaveAs("vtxz_number.png");
//delete canvas;
//delete vtxz_plot;


    //after the loop over all events, draw the resulting plots

    canvas->Divide(2,3);
    /*canvas->cd(1);
    gPad->SetLogy();
    dz_sigmadz->DrawNormalized("", 1);

    canvas->cd(2);
    gPad->SetLogy();
    d0_sigmad0->DrawNormalized("", 1);

    gPad->SetLogy();
    pt_sigmapt->DrawNormalized("", 1);
    canvas->Update();*/

    canvas->cd(1);
    gPad->SetLogy();
    pt_histo->DrawNormalized("", 1);
    //canvas->Update();

    canvas->cd(2);
    gPad->SetLogy();
    eta_histo->DrawNormalized("", 1);
    //canvas->Update();

    canvas->cd(3);
    gPad->SetLogy();
    phi_histo->DrawNormalized("",1);
    //canvas->Update();

    canvas->cd(4);
    gPad->SetLogy();
    dz_sigmadz->DrawNormalized("", 1);

    canvas->cd(5);
    gPad->SetLogy();
    d0_sigmad0->DrawNormalized("", 1);

    canvas->cd(6);
    gPad->SetLogy();
    pt_sigmapt->DrawNormalized("", 1);
    canvas->Update();

    canvas->SaveAs("tree_1_relative_errors.pdf");
}