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