TOF/tzero15tracks.C

   1 void tzero15tracks(const char* datafile, Float_t globalTimeRes=1.2e-10)
   2 {
   3
   4   //
   5   // Calculate the t0 distribution
   6   //
   7   // (primary particles reaching TOF)
   8   //
   9
  10
  11   // Dynamically link some shared libs
  12   if (gClassTable->GetID("AliRun") < 0) {
  13     gROOT->LoadMacro("loadlibs.C");
  14     loadlibs();
  15   }
  16
  17   // Connect the Root Galice file containing Geometry, Kine and Hits
  18   Int_t ngood;
  19   Int_t nmisidentified=0;
  20   Int_t nmisidentified0=0;
  21   Int_t nmisidentified1=0;
  22   Int_t nmisidentified2=0;
  23   Int_t nmisidentified3=0;
  24   Int_t nmisidentified4=0;
  25   Int_t nmisidentified5=0;
  26   Int_t nmisidentified6=0;
  27   Int_t nmisidentified7=0;
  28   Int_t nmisidentified8=0;
  29   Int_t nmisidentified9=0;
  30   Int_t nmisidentified10=0;
  31   Int_t nmisidentified11=0;
  32   Int_t nmisidentified12=0;
  33   Int_t nmisidentified13=0;
  34   Int_t nmisidentified14=0;
  35   Int_t nbytes = 0;
  36   Int_t ipartold = -1;
  37   Int_t dblehit = 0;
  38   Int_t j,hit,ipart;
  39   Int_t nhits;
  40   Int_t selected=0;
  41   Int_t istop=0;
  42   const Float_t timeresolution=globalTimeRes; // in [s]
  43   Float_t timeresolutioninns=timeresolution*(1.e+9); // convert in [ns]
  44   cout << "Global Time Resolution " << timeresolutioninns << " ns" << endl; //
  45
  46   // output (histos!) filename
  47   char outFileName[100];
  48   strcpy(outFileName,"ht015tr");
  49   strcat(outFileName,datafile);
  50
  51   gBenchmark->Start("TOFT0");
  52
  53   TH1F* htzerobest= new TH1F("htzerobest","T0 for best assignment",200,-1.,1.);
  54   TH1F* hchibest  = new TH1F("hchibest","ChiSquare Min Distribution",80,0.,40.);
  55   TH1F* hchibestconflevel  = new TH1F("hchibestconflevel","ChiSquare Min Confidence Level",10,0.,1.);
  56
  57   Float_t t0best=999.;
  58   Int_t assparticle[15]={3,3,3,3,3,3,3,3,3,3,3,3,3,3,3};
  59   Int_t truparticle[15]={3,3,3,3,3,3,3,3,3,3,3,3,3,3,3};
  60   Float_t timeofflight[15]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
  61   Float_t momentum[15]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
  62   Float_t timezero[15];
  63   Float_t weightedtimezero[15];
  64   Float_t beta[15]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
  65   Float_t sqMomError[15]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
  66   Float_t sqTrackError[15]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
  67   Float_t massarray[3]={0.13957,0.493677,0.9382723};
  68   Float_t chisquare=999.;
  69   Float_t tracktoflen[15]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
  70   TRandom* rnd = new TRandom();
  71   TParticle *particle;
  72   AliTOFhitT0  *tofHit;
  73
  74   TFile *file = TFile::Open(datafile,"old");
  75
  76   // Get AliRun object from file or create it if not on file
  77   gAlice = (AliRun*)file->Get("gAlice");
  78
  79   // Import the Kine and Hits Trees for the event evNumber in the file
  80
  81   Int_t nallevents = (Int_t) gAlice->TreeE()->GetEntries();
  82
  83   for (Int_t nev=0; nev<nallevents;nev++) {
  84
  85     Int_t nparticles = gAlice->GetEvent(nev);
  86     if (nparticles <= 0) return;
  87     //     ngood=0;
  88     // Get pointers to Alice detectors and Hits containers
  89
  90     AliDetector *TOF  = gAlice->GetDetector("TOF");
  91     TObjArray *Particles = gAlice->Particles();
  92
  93     if (TOF) TClonesArray *TOFhits   = TOF->Hits();
  94
  95     TTree *TH = gAlice->TreeH();
  96     Int_t ntracks = TH->GetEntries();
  97
  98
  99     // Start loop on primary tracks in the hits containers
 100     Int_t lasttrack=-1;
 101     Int_t nset=0;
 102     for (Int_t track=lasttrack+1; track<ntracks;track++) {
 103
 104       if(nset>=3) break; // check on the number of set analyzed
 105
 106       gAlice->ResetHits();
 107       nbytes += TH->GetEvent(track);
 108
 109       // =======>Histogram TOF
 110       if (TOF) {
 111         nhits = TOFhits->GetEntriesFast();
 112
 113         for (hit=0;hit<nhits;hit++) {
 114
 115           tofHit   = (AliTOFhitT0*)TOFhits->UncheckedAt(hit);
 116           ipart    = tofHit->GetTrack();
 117
 118           // check to discard the case when the same particle is selected more than one
 119           // time
 120
 121           if (ipart != ipartold){
 122
 123             particle = (TParticle*)gAlice->Particle(ipart);
 124
 125             Float_t idealtime=tofHit->GetTof();
 126             //     Float_t time=idealtime;
 127             Float_t time   = rnd->Gaus(idealtime, timeresolution);
 128             Float_t toflen=tofHit->GetLen();
 129             toflen=toflen/100.; // toflen given in m because GEANT gives cm!
 130             Int_t pdg   = particle->GetPdgCode();
 131             Int_t abspdg   =TMath::Abs(pdg);
 132             Float_t idealmom  = particle->P();
 133             Float_t momres=idealmom*0.025; // 2.5% res token into account for all momenta
 134             //Float_t mom =idealmom+2.*(rnd->Rndm()-0.5)*momres;
 135             Float_t mom =rnd->Gaus(idealmom,momres);
 136             Bool_t isgoodpart=(abspdg==211 || abspdg==2212 || abspdg==321);
 137
 138             time*=1.e+9; // tof given in nanoseconds
 139             if (particle->GetFirstMother() < 0 && isgoodpart && mom<=1.7 && mom>=1.25){
 140
 141               selected+=1;
 142               istop=selected;
 143               if(istop>15) break;
 144               Int_t index=selected-1;
 145               timeofflight[index]=time;
 146               tracktoflen[index]=toflen;
 147               momentum[index]=mom;
 148               switch (abspdg) {
 149               case 211:
 150                 truparticle[index]=0;
 151                 break ;
 152               case 321:
 153                 truparticle[index]=1;
 154                 break ;
 155               case 2212:
 156                 truparticle[index]=2;
 157                 break ;
 158               }
 159
 160             }
 161             ipartold = ipart;
 162
 163             if(istop==15){ // start analysis on current set
 164               nset+=1;
 165               lasttrack=track;
 166               istop=0;
 167               selected=0;
 168               cout << "starting t0 calculation for current set" << endl;
 169               for (Int_t i1=0; i1<3;i1++) {
 170                 for (Int_t i2=0; i2<3;i2++) {
 171                   for (Int_t i3=0; i3<3;i3++) {
 172                     for (Int_t i4=0; i4<3;i4++) {
 173                       for (Int_t i5=0; i5<3;i5++) {
 174                         for (Int_t i6=0; i6<3;i6++) {
 175                           for (Int_t i7=0; i7<3;i7++) {
 176                             for (Int_t i8=0; i8<3;i8++) {
 177                               for (Int_t i9=0; i9<3;i9++) {
 178                                 for (Int_t i10=0; i10<3;i10++) {
 179                                   for (Int_t i11=0; i11<3;i11++) {
 180                                     for (Int_t i12=0; i12<3;i12++) {
 181                                       for (Int_t i13=0; i13<3;i13++) {
 182                                         for (Int_t i14=0; i14<3;i14++) {
 183                                           for (Int_t i15=0; i15<3;i15++) {
 184                                             beta[0]=momentum[0]/sqrt(massarray[i1]*massarray[i1]+momentum[0]*momentum[0]);
 185                                             beta[1]=momentum[1]/sqrt(massarray[i2]*massarray[i2]+momentum[1]*momentum[1]);
 186                                             beta[2]=momentum[2]/sqrt(massarray[i3]*massarray[i3]+momentum[2]*momentum[2]);
 187                                             beta[3]=momentum[3]/sqrt(massarray[i4]*massarray[i4]+momentum[3]*momentum[3]);
 188                                             beta[4]=momentum[4]/sqrt(massarray[i5]*massarray[i5]+momentum[4]*momentum[4]);
 189                                             beta[5]=momentum[5]/sqrt(massarray[i6]*massarray[i6]+momentum[5]*momentum[5]);
 190                                             beta[6]=momentum[6]/sqrt(massarray[i7]*massarray[i7]+momentum[6]*momentum[6]);
 191                                             beta[7]=momentum[7]/sqrt(massarray[i8]*massarray[i8]+momentum[7]*momentum[7]);
 192                                             beta[8]=momentum[8]/sqrt(massarray[i9]*massarray[i9]+momentum[8]*momentum[8]);
 193                                             beta[9]=momentum[9]/sqrt(massarray[i10]*massarray[i10]+momentum[9]*momentum[9]);
 194                                             beta[10]=momentum[10]/sqrt(massarray[i11]*massarray[i11]+momentum[10]*momentum[10]);
 195                                             beta[11]=momentum[11]/sqrt(massarray[i12]*massarray[i12]+momentum[11]*momentum[11]);
 196                                             beta[12]=momentum[12]/sqrt(massarray[i13]*massarray[i13]+momentum[12]*momentum[12]);
 197                                             beta[13]=momentum[13]/sqrt(massarray[i14]*massarray[i14]+momentum[13]*momentum[13]);
 198                                             beta[14]=momentum[14]/sqrt(massarray[i15]*massarray[i15]+momentum[14]*momentum[14]);
 199
 200
 201                                             Float_t meantzero=0.;
 202                                             Float_t sumAllweights=0.;
 203                                             for (Int_t itz=0; itz<15;itz++) {
 204                                               sqMomError[itz]=((1.-beta[itz]*beta[itz])*0.025)*((1.-beta[itz]*beta[itz])*0.025)*(tracktoflen[itz]/(0.299792*beta[itz]))*(tracktoflen[itz]/(0.299792*beta[itz])); // this gives the square of the momentum error in nanoseconds
 205                                               sqTrackError[itz]=(timeresolutioninns*timeresolutioninns+sqMomError[itz]); // total error for the current track
 206                                               sumAllweights+=1./sqTrackError[itz];
 207                                               // redefining beta, it is useful in order to calculate t zero
 208                                               beta[itz]*=0.299792;
 209                                               timezero[itz]=(tracktoflen[itz]/beta[itz])-timeofflight[itz];
 210                                               weightedtimezero[itz]=((tracktoflen[itz]/beta[itz])-timeofflight[itz])/sqTrackError[itz];// weighted time zero for current track
 211                                               meantzero+=weightedtimezero[itz];
 212                                             }
 213                                             meantzero=meantzero/sumAllweights; // it is given in [ns]
 214
 215                                             Float_t dummychisquare=0.;
 216                                             // calculate the chisquare for the current assignment
 217                                             for (Int_t itz=0; itz<15;itz++) {
 218                                               dummychisquare+=(timezero[itz]-meantzero)*(timezero[itz]-meantzero)/sqTrackError[itz];
 219                                             }
 220
 221
 222                                             if(dummychisquare<=chisquare){
 223                                               assparticle[0]=i1;
 224                                               assparticle[1]=i2;
 225                                               assparticle[2]=i3;
 226                                               assparticle[3]=i4;
 227                                               assparticle[4]=i5;
 228                                               assparticle[5]=i6;
 229                                               assparticle[6]=i7;
 230                                               assparticle[7]=i8;
 231                                               assparticle[8]=i9;
 232                                               assparticle[9]=i10;
 233                                               assparticle[10]=i11;
 234                                               assparticle[11]=i12;
 235                                               assparticle[12]=i13;
 236                                               assparticle[13]=i14;
 237                                               assparticle[14]=i15;
 238                                               chisquare=dummychisquare;
 239                                               t0best=meantzero;
 240                                             }
 241                                           }
 242                                         }
 243                                       }
 244                                     }
 245                                   }
 246                                 }
 247                               }
 248                             }
 249                           }
 250                         }
 251
 252                       }
 253                     }
 254                   }
 255                 }
 256               }
 257
 258               cout << "true" << truparticle[0] << truparticle[1] << truparticle[2] << truparticle[3] << truparticle[4] << truparticle[5] << truparticle[6] << truparticle[7] << truparticle[8] << truparticle[9] <<truparticle[10] << truparticle[11] << truparticle[12] << truparticle[13] << truparticle[14] <<endl;
 259               cout << "best" << assparticle[0] << assparticle[1] << assparticle[2] << assparticle[3] << assparticle[4] << assparticle[5] << assparticle[6] << assparticle[7] << assparticle[8] << assparticle[9] <<assparticle[10] << assparticle[11] << assparticle[12] << assparticle[13] << assparticle[14] << endl;
 260               if(truparticle[0]==assparticle[0] && truparticle[1]==assparticle[1] && truparticle[2]==assparticle[2]  && truparticle[3]==assparticle[3] && truparticle[4]==assparticle[4]&& truparticle[5]==assparticle[5] && truparticle[6]==assparticle[6] && truparticle[7]==assparticle[7]  && truparticle[8]==assparticle[8] && truparticle[9]==assparticle[9] &&truparticle[10]==assparticle[10] && truparticle[11]==assparticle[11] && truparticle[12]==assparticle[12]  && truparticle[13]==assparticle[13] && truparticle[14]==assparticle[14]) ngood+=1;
 261               if(truparticle[0]!=assparticle[0]) nmisidentified0+=1;
 262               if(truparticle[1]!=assparticle[1]) nmisidentified1+=1;
 263               if(truparticle[2]!=assparticle[2]) nmisidentified2+=1;
 264               if(truparticle[3]!=assparticle[3]) nmisidentified3+=1;
 265               if(truparticle[4]!=assparticle[4]) nmisidentified4+=1;
 266               if(truparticle[5]!=assparticle[5]) nmisidentified5+=1;
 267               if(truparticle[6]!=assparticle[6]) nmisidentified6+=1;
 268               if(truparticle[7]!=assparticle[7]) nmisidentified7+=1;
 269               if(truparticle[8]!=assparticle[8]) nmisidentified8+=1;
 270               if(truparticle[9]!=assparticle[9]) nmisidentified9+=1;
 271               if(truparticle[10]!=assparticle[10]) nmisidentified10+=1;
 272               if(truparticle[11]!=assparticle[11]) nmisidentified11+=1;
 273               if(truparticle[12]!=assparticle[12]) nmisidentified12+=1;
 274               if(truparticle[13]!=assparticle[13]) nmisidentified13+=1;
 275               if(truparticle[14]!=assparticle[14]) nmisidentified14+=1;
 276               cout << "chisquare for current set" << chisquare << endl;
 277               //Float_t weight=1./chisquare;
 278               //htzerobest->Fill(t0best,weight);
 279               htzerobest->Fill(t0best);
 280               hchibest->Fill(chisquare);
 281               Double_t dblechisquare=(Double_t)chisquare;
 282               Float_t confLevel=(Float_t)TMath::Prob(dblechisquare,14);
 283               cout << "conf level " << confLevel << endl;
 284               hchibestconflevel->Fill(confLevel);
 285               chisquare=999.;
 286               t0best=999.;
 287
 288             } // end for the current set. close if(istop==5)
 289
 290
 291           } // end condition on ipartold
 292
 293
 294         }// end loop on hits for the current track
 295       }// end TOF
 296       if(istop>=15) break;
 297     }// end loop on Tracks
 298     cout << "ngood for current event " << ngood << endl;
 299
 300
 301   }//end loop on events
 302
 303   nmisidentified=(nmisidentified0+nmisidentified1+nmisidentified2+nmisidentified3+nmisidentified4+nmisidentified5+nmisidentified6+nmisidentified7+nmisidentified8+nmisidentified9+nmisidentified10+nmisidentified11+nmisidentified12+nmisidentified13+nmisidentified14);
 304   cout << "total misidentified " << nmisidentified << endl;
 305   TFile *houtfile = new TFile(outFileName,"recreate");
 306   houtfile->cd();
 307
 308   htzerobest->Write();
 309   hchibest->Write();
 310   hchibestconflevel->Write();
 311   houtfile->Close();
 312
 313   gBenchmark->Stop("TOFT0");
 314   cout << "15 tracks:" << endl ;
 315   cout << "   took " << gBenchmark->GetCpuTime("TOFT0") << " seconds in order to calculate T0 "
 316        <<  gBenchmark->GetCpuTime("TOFT0")/nallevents << " seconds per event " << endl ;
 317   cout << endl ;
 318
 319 }
 320
 321