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