PWG3/AliD0toKpiPlots.C

   1 void AliD0toKpiPlots(const Char_t *inName="AliD0toKpi.root",
   2                      const Char_t *outName="D0histograms.root") {
   3   //--------------------------------------------------------------------------
   4   // This macro histograms many variables of D0->Kpi candidates
   5   //
   6   //     Andrea Dainese, andrea.dainese@lnl.infn.it
   7   //--------------------------------------------------------------------------
   8
   9   gSystem->Load("libANALYSIS");
  10   gSystem->Load("libAOD.so");
  11   gSystem->Load("libPWG3base.so");
  12
  13   // set of cuts
  14   Double_t D0Cuts[9] = {0.1,         // mass [GeV]
  15                         1000000.,          // dca [micron]
  16                         1.1,           // cosThetaStar
  17                         0.,           // pT K [GeV/c]
  18                         0.,           // pT Pi [GeV/c]
  19                         100000.,       // d0K upper [micron]
  20                         100000.,       // d0Pi upper [micron]
  21                         10000000000.,            // d0d0 [micron^2]
  22                         -1.1};          // cosThetaPointing
  23
  24   // number of events (for normalization)
  25   Bool_t normalize = kFALSE;
  26   Double_t  events = 1.;
  27
  28
  29
  30   // define histograms
  31   TH1F *hptK = new TH1F("hptK","\"K\" p_{t} distribution",50,0,10);
  32   hptK->SetXTitle("p_{t} [GeV]");
  33
  34   TH1F *hptPi = new TH1F("hptPi","\"#pi\" p_{t} distribution",50,0,10);
  35   hptPi->SetXTitle("p_{t} [GeV]");
  36
  37   TH1F *hDCA = new TH1F("hDCA","DCA",50,0,1000);
  38   hDCA->SetXTitle("dca [#mu m]");
  39
  40   TH1F *hptD0 = new TH1F("hptD0","D^{0} p_{t} distribution",40,0,40);
  41   hptD0->SetXTitle("p_{t} [GeV]");
  42
  43   TH1F *hyD0 = new TH1F("hyD0","D^{0} rapidity distribution",50,-2,2);
  44   hyD0->SetXTitle("y");
  45
  46   TH1F *hCPtaD0 = new TH1F("hCPtaD0","cosine of pointing angle distribution",100,-1,1);
  47   hCPtaD0->SetXTitle("cos #theta_{point}");
  48
  49   TH1F *hCPtaXY = new TH1F("hCPtaXY","cosine of pointing angle in (x,y) plane",100,-1,1);
  50   hCPtaXY->SetXTitle("cos #theta_{point}");
  51
  52   TH1F *hCts = new TH1F("hCts","cosine of decay angle",50,-1.2,1.2);
  53   hCts->SetXTitle("cos #theta^{*}");
  54
  55   TH2F *hCtsVsPtK = new TH2F("hCtsVsPtK","cosine of decay angle VS \"K\" p_{t}",50,0,5,50,-1,1);
  56   hCtsVsPtK->SetYTitle("cos #theta^{*}");
  57   hCtsVsPtK->SetXTitle("p_{t} [GeV]");
  58
  59   TH1F *hd0d0 = new TH1F("hd0d0","Product of the impact parameters",100,-100000,100000);
  60   hd0d0->SetXTitle("d_{0}^{K} #times d_{0}^{#pi} [#mu m^{2}]");
  61
  62   TH1F *hd0K = new TH1F("hd0K","Impact parameter of \"K\"",100,-5000,5000);
  63   hd0K->SetXTitle("d_{0}^{K} [#mu m]");
  64
  65   TH1F *hd0Pi = new TH1F("hd0Pi","Impact parameter of \"#pi\"",100,-5000,5000);
  66   hd0Pi->SetXTitle("d_{0}^{#pi} [#mu m]");
  67
  68   TH2F *hCPtaVsd0d0 = new TH2F("hCPtaVsd0d0","cos #theta_{point} vs d_{0}^{K} #times d_{0}^{#pi}",100,-100000,100000,100,-1,1);
  69   hCPtaVsd0d0->SetXTitle("d_{0}^{K} #times d_{0}^{#pi} [#mu m^{2}]");
  70   hCPtaVsd0d0->SetYTitle("cos #theta_{point}");
  71
  72   TH2F *hCPtaVsd0d0zoom = new TH2F("hCPtaVsd0d0zoom","cos #theta_{point} vs d_{0}^{K} #times d_{0}^{#pi}",100,-100000,0,100,.9,1);
  73   hCPtaVsd0d0zoom->SetXTitle("d_{0}^{K} #times d_{0}^{#pi} [#mu m^{2}]");
  74   hCPtaVsd0d0zoom->SetYTitle("cos #theta_{point}");
  75
  76   TH2F *hd0d0VSptD0 = new TH2F("hd0d0VSptD0","d_{0}^{K} #times d_{0}^{#pi} VS D^{0} p_{t}",50,0,25,100,-120000,120000);
  77   hd0d0VSptD0->SetYTitle("d_{0}^{K} #times d_{0}^{#pi} [#mu m^{2}]");
  78   hd0d0VSptD0->SetXTitle("D^{0} p_{t} [GeV]");
  79
  80   TH1F *hMass = new TH1F("hMass","Invariant mass distribution",50,1.765,1.965);
  81   hMass->SetXTitle("M[K,#pi] [GeV]");
  82
  83   TH2F *hArm = new TH2F("hArm","Armenteros plot",50,-2,2,50,0,1);
  84   hArm->SetXTitle("#alpha");
  85   hArm->SetYTitle("q_{t}");
  86
  87   // open input file and get tree
  88   TFile *inFile = TFile::Open(inName);
  89
  90   TTree *treeD0 = (TTree*)inFile->Get("TreeD0");
  91   AliD0toKpi *D = 0;
  92   treeD0->SetBranchAddress("D0toKpi",&D);
  93   Int_t entries = (Int_t)treeD0->GetEntries();
  94
  95   printf("+++\n+++ Number of D0 in tree:  %d\n+++\n",entries);
  96
  97   Double_t MD0,MD0bar,ctsD0,ctsD0bar,ctsPiD0,ctsPiD0bar;
  98   Double_t WgtD0,WgtD0bar;
  99   Double_t sampleABC=0.;
 100   Int_t okD0=0,okD0bar=0;
 101   Int_t nSel = 0;
 102   Int_t ptbin;
 103
 104   // loop on D0
 105   for(Int_t i=0; i<entries; i++) {
 106     if(i%10000==0) printf(" candidate %d of %d\n",i,entries);
 107
 108     // get event from tree
 109     treeD0->GetEvent(i);
 110     //--- select the PID strategy & compute weights
 111     //    D->ApplyPID("TOFparam_PbPb");
 112     //    D->ComputeWgts();
 113     // get weights for the three samples A+B+C
 114     //    D->GetWgts(WgtD0,WgtD0bar,"ABC");
 115     WgtD0 = 1.; WgtD0bar = 1.;
 116
 117     // normalize to 1 event
 118     if(normalize) { WgtD0 /= events; WgtD0bar /= events; }
 119
 120     // check if candidate passes selection (as D0 or D0bar)
 121     D->Select(D0Cuts,okD0,okD0bar);
 122
 123     // set weights to 0 if the candidate doesn't pass selection
 124     if(!okD0)    WgtD0=0.;
 125     if(!okD0bar) WgtD0bar=0.;
 126     if(okD0 || okD0bar) nSel++;
 127
 128     // count selected candidates
 129     sampleABC += WgtD0 + WgtD0bar;
 130
 131     // inv mass and cosThetaStar
 132     D->InvMass(MD0,MD0bar);
 133     D->CosThetaStar(ctsD0,ctsD0bar);
 134
 135     // fill histograms
 136     hptK->Fill(D->PtChild(1),WgtD0);
 137     hptK->Fill(D->PtChild(0),WgtD0bar);
 138     hptPi->Fill(D->PtChild(0),WgtD0);
 139     hptPi->Fill(D->PtChild(1),WgtD0bar);
 140     hd0K->Fill(D->Getd0Child(1),WgtD0);
 141     hd0K->Fill(D->Getd0Child(0),WgtD0bar);
 142     hd0Pi->Fill(D->Getd0Child(0),WgtD0);
 143     hd0Pi->Fill(D->Getd0Child(1),WgtD0bar);
 144     hMass->Fill(MD0,WgtD0);
 145     hMass->Fill(MD0bar,WgtD0bar);
 146     hCts->Fill(ctsD0,WgtD0);
 147     hCts->Fill(ctsD0bar,WgtD0bar);
 148     hCtsVsPtK->Fill(D->PtChild(1),ctsD0,WgtD0);
 149     hCtsVsPtK->Fill(D->PtChild(0),ctsD0bar,WgtD0bar);
 150     hDCA->Fill(D->GetDCA(),WgtD0+WgtD0bar);
 151     hptD0->Fill(D->Pt(),WgtD0+WgtD0bar);
 152     hyD0->Fill(D->Rapidity(),WgtD0+WgtD0bar);
 153     hd0d0->Fill(D->ProdImpParams(),WgtD0+WgtD0bar);
 154     hCPtaD0->Fill(D->CosPointing(),WgtD0+WgtD0bar);
 155     hCPtaXY->Fill(D->CosPointingXY(),WgtD0+WgtD0bar);
 156     hCPtaVsd0d0->Fill(D->ProdImpParams(),D->CosPointing(),WgtD0+WgtD0bar);
 157     hd0d0VSptD0->Fill(D->Pt(),D->ProdImpParams(),WgtD0+WgtD0bar);
 158     hCPtaVsd0d0zoom->Fill(D->ProdImpParams(),D->CosPointing(),WgtD0+WgtD0bar);
 159     hArm->Fill(D->Alpha(),D->Qt(),WgtD0+WgtD0bar);
 160
 161
 162   } // end loop on D0 candidates
 163
 164   inFile->Close();
 165
 166   printf("\n\n --- Total number of candidates passing selection: %d\n\n --- Sum of weights sample A+B+C: %f\n\n",nSel,sampleABC);
 167
 168   // draw histograms
 169   TCanvas *c1 = new TCanvas("c1","pt K & pi",0,0,700,700);
 170   c1->SetLogy();
 171   hptK->Draw();
 172   hptPi->Draw("same");
 173
 174   TCanvas *c2 = new TCanvas("c2","pt D0",0,0,700,700);
 175   c2->SetLogy();
 176   hptD0->Draw();
 177
 178   TCanvas *c3 = new TCanvas("c3","rapidity D0",0,0,700,700);
 179   hyD0->Draw();
 180
 181   TCanvas *c4 = new TCanvas("c4","pointing angle",0,0,700,700);
 182   hCPtaD0->Draw();
 183
 184   TCanvas *c5 = new TCanvas("c5","d0 x d0",0,0,700,700);
 185   c5->SetLogy();
 186   hd0d0->Draw();
 187
 188   TCanvas *c6 = new TCanvas("c6","pointing angle VS d0d0",0,0,700,700);
 189   c6->SetLogz();
 190   hCPtaVsd0d0->Draw("box");
 191
 192   TCanvas *c7 = new TCanvas("c7","mass",0,0,700,700);
 193   hMass->Draw();
 194
 195   TCanvas *c8 = new TCanvas("c8","armenteros",0,0,700,700);
 196   hArm->Draw("box");
 197
 198   TCanvas *c9 = new TCanvas("c9","decay angle",0,0,700,700);
 199   hCts->Draw();
 200
 201   TCanvas *c10 = new TCanvas("c10","dca",0,0,700,700);
 202   c10->SetLogy();
 203   hDCA->Draw();
 204
 205   TCanvas *c11 = new TCanvas("c11","d0 K & pi",0,0,700,700);
 206   c11->SetLogy();
 207   hd0K->Draw();
 208   hd0Pi->Draw("same");
 209
 210   // write all histograms to file
 211   TFile *outFile = new TFile(outName,"recreate");
 212   hMass->Write();
 213   hDCA->Write();
 214   hCts->Write();
 215   hCtsVsPtK->Write();
 216   hArm->Write();
 217   hCPtaVsd0d0->Write();
 218   hd0d0VSptD0->Write();
 219   hCPtaVsd0d0zoom->Write();
 220   hd0d0->Write();
 221   hCPtaD0->Write();
 222   hCPtaXY->Write();
 223   hptK->Write();
 224   hptPi->Write();
 225   hptD0->Write();
 226   hyD0->Write();
 227   hd0K->Write();
 228   hd0Pi->Write();
 229   outFile->Close();
 230
 231   return;
 232 }
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