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