HLT/trigger/RunD0Trigger.C

   1 //#define __COMPILE__
   2 //#ifdef __COMPILE__
   3 #if !defined(__CINT__) || defined(__MAKECINT__)
   4 //-- --- standard headers-------------
   5 #include <iostream.h>
   6 //--------Root headers ---------------
   7 #include <TSystem.h>
   8 #include <TFile.h>
   9 #include <TString.h>
  10 #include <TStopwatch.h>
  11 #include <TObject.h>
  12 #include <TVector3.h>
  13 #include <TTree.h>
  14 #include <TParticle.h>
  15 #include <TArray.h>
  16 //----- AliRoot headers ---------------
  17 #include "alles.h"
  18 #include "AliRun.h"
  19 #include "AliKalmanTrack.h"
  20 #include "AliITStrackV2.h"
  21 #include "AliHeader.h"
  22 #include "AliGenEventHeader.h"
  23 #include "AliV0vertex.h"
  24 #include "AliV0vertexer.h"
  25 #include "AliITSVertex.h"
  26 #include "AliITSVertexer.h"
  27 #include "AliITSVertexerTracks.h"
  28 #include "AliD0Trigger.h"
  29 #endif
  30 //-------------------------------------
  31 // field (T)
  32 const Double_t kBz = 0.4;
  33
  34 // primary vertex
  35 Double_t primaryvertex[3] = {0.,0.,0,};
  36
  37 // sigle track cuts
  38 const Double_t kPtCut = 0.5;      // GeV/c
  39 const Double_t kd0Cut = 50.;      // micron
  40 const Double_t kd0CutHigh = 200.; // micron
  41
  42
  43 //cuts for combined tracks
  44 const Double_t cuts[5] = {0.005,  // cuts[0] = lowest V0 cut  (cm)
  45                           200,    // cuts[1] = highest V0 cut (cm) //0.02
  46                           0.1,    // cuts[2] = inv. mass cut (diferense) (Gev/c)
  47                           0.95,   // cuts[3] = max cosine value for pointing angle
  48                           -5000}; // cuts[4] = max cosine value for pointing angle
  49
  50 Int_t iTrkP,iTrkN,itsEntries;
  51 Char_t trksName[100];
  52 Int_t nTrksP=0,nTrksN=0;
  53 Int_t nD0=0;
  54 int ev=0;
  55
  56 void RunD0Trigger(Int_t evFirst=0,Int_t evLast=1,Char_t* path="./") {
  57
  58   const Char_t *name="AliD0Trigger";
  59   cerr<<'\n'<<name<<"...\n";
  60   gBenchmark->Start(name);
  61
  62   AliKalmanTrack::SetConvConst(100/0.299792458/kBz);
  63
  64   // Open file with ITS tracks
  65   Char_t fnameTrack[1024];
  66   sprintf(fnameTrack,"%s/AliITStracksV2.root",path);
  67   TFile* itstrks = TFile::Open(fnameTrack);
  68
  69    // tracks from ITS
  70   sprintf(trksName,"TreeT_ITS_%d",ev);
  71   TTree *itsTree=(TTree*)itstrks->Get(trksName);
  72   if(!itsTree) continue;
  73   itsEntries = (Int_t)itsTree->GetEntries();
  74   printf("+++\n+++ Number of tracks in ITS: %d\n+++\n\n",itsEntries);
  75
  76   //Getting primary Vertex
  77   GetPrimaryVertex(0,path);
  78
  79   // call function which applies sigle track selection and
  80   // separetes positives and negatives
  81   TObjArray trksP(itsEntries/2);
  82   Int_t *itsEntryP = new Int_t[itsEntries];
  83   TObjArray trksN(itsEntries/2);
  84   Int_t *itsEntryN = new Int_t[itsEntries];
  85   SelectTracks(*itsTree,trksP,itsEntryP,nTrksP,trksN,itsEntryN,nTrksN);
  86
  87   cout<<"#pos: "<<nTrksP<<endl;
  88   cout<<"#neg: "<<nTrksN<<endl;
  89
  90   AliD0Trigger * D0 = new AliD0Trigger(cuts,kBz,primaryvertex);
  91
  92   for(iTrkP=0; iTrkP<nTrksP; iTrkP++) {
  93     postrack = (AliITStrackV2*)trksP.At(iTrkP);
  94     for(iTrkN=0; iTrkN<nTrksN; iTrkN++) {
  95       negtrack = (AliITStrackV2*)trksN.At(iTrkN);
  96       D0.SetTracks(postrack,negtrack);
  97       if(D0.FindV0()){
  98         D0.FindMomentaAtVertex();
  99         if(D0.FindInvMass()){
 100           if(D0.PointingAngle()){
 101             nD0++;
 102           }
 103         }
 104       }
 105     }
 106   }
 107   cout<<"#D0: "<<nD0<<endl;
 108   gBenchmark->Stop(name);
 109   gBenchmark->Show(name);
 110 }
 111 //___________________________________________________________________________
 112 void   SelectTracks(TTree& itsTree,
 113                     TObjArray& trksP,Int_t* itsEntryP,Int_t& nTrksP,
 114                     TObjArray& trksN,Int_t* itsEntryN,Int_t& nTrksN) {
 115 //
 116 // this function creates two TObjArrays with positive and negative tracks
 117 //
 118   nTrksP=0,nTrksN=0;
 119
 120
 121   Int_t entr = (Int_t)itsTree.GetEntries();
 122
 123   // trasfer tracks from tree to arrays
 124   for(Int_t i=0; i<entr; i++) {
 125
 126     AliITStrackV2 *itstrack = new AliITStrackV2;
 127     itsTree.SetBranchAddress("tracks",&itstrack);
 128
 129     itsTree.GetEvent(i);
 130
 131     // single track selection
 132     if(!TrkCuts(*itstrack)) { delete itstrack; continue; }
 133
 134     if(itstrack->Get1Pt()>0.) { // negative track
 135       trksN.AddLast(itstrack);
 136       itsEntryN[nTrksN] = i;
 137       nTrksN++;
 138     } else {                    // positive track
 139       trksP.AddLast(itstrack);
 140       itsEntryP[nTrksP] = i;
 141       nTrksP++;
 142     }
 143
 144   }
 145
 146   return;
 147 }
 148 //____________________________________________________________________________
 149 Bool_t TrkCuts(const AliITStrackV2& trk) {
 150 //
 151 // this function tells if track passes some kinematical cuts
 152 //
 153   if(TMath::Abs(1./trk.Get1Pt()) < kPtCut)                return kFALSE;
 154   if(TMath::Abs(10000.*trk.GetD(primaryvertex[0],primaryvertex[1])) < kd0Cut) return kFALSE;
 155   if(TMath::Abs(10000.*trk.GetD(primaryvertex[0],primaryvertex[1])) > kd0CutHigh) return kFALSE;
 156
 157   return kTRUE;
 158 }
 159 //____________________________________________________________________________
 160 void GetPrimaryVertex(int i,Char_t* path="./") {
 161
 162   int event=i;
 163
 164   Char_t falice[1024];
 165   sprintf(falice,"%s/galice.root",path);
 166   TFile * galice = new TFile(falice);
 167
 168   TDirectory * curdir;
 169
 170   Char_t vname[20];
 171   galice->cd();
 172
 173   sprintf(vname,"Vertex_%d",event);
 174   TArrayF o = 0;
 175   o.Set(3);
 176   AliHeader * header = 0;
 177
 178   TTree * treeE = (TTree*)gDirectory->Get("TE");
 179   treeE->SetBranchAddress("Header",&header);
 180   treeE->GetEntry(event);
 181   AliGenEventHeader* genHeader = header->GenEventHeader();
 182   if(genHeader){
 183     genHeader->PrimaryVertex(o);
 184     primaryvertex[0] = (Double_t)o[0];
 185     primaryvertex[1] = (Double_t)o[1];
 186     primaryvertex[2] = (Double_t)o[2];
 187   }
 188   else{
 189     printf("Can't find Header");
 190   }
 191   delete header;
 192   delete galice;
 193 }