TOF/AliTOFT0.cxx

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  15
  16 /* $Id$ */
  17
  18 //_________________________________________________________________________
  19 //
  20 // This is a TTask that made the calculation of the Time zero using TOF.
  21 // Description: The algorithm used to calculate the time zero of
  22 // interaction using TOF detector is the following.
  23 // We select in the MonteCarlo some primary particles - or tracks in
  24 // the following - that strike the TOF detector (the larger part are
  25 // pions, kaons or protons).
  26 // We choose a set of 10 selected tracks, for each track You have the
  27 // length of the track when the TOF is reached (a standard TOF hit
  28 // does not contain this additional information, this is the reason
  29 // why we implemented a new time zero dedicated TOF hit class
  30 // AliTOFhitT0; in order to store this type of hit You have to use the
  31 // AliTOFv4T0 as TOF class in Your Config.C. In AliTOFv4T0 the
  32 // StepManager was modified in order to fill the TOF hit branch with
  33 // this type of hits; in fact the AliTOF::AddT0Hit is called rather
  34 // that the usual AliTOF::AddHit), the momentum at generation (from
  35 // TreeK) and the time of flight given by the TOF detector.
  36 // (Observe that the ctor of the AliTOF class, when the AliTOFv4T0
  37 // class is used, is called with the "tzero" option: it is in order
  38 // create the fHits TClonesArray filled with AliTOFhitT0 objects,
  39 // rather than with normal AliTOFhit)
  40 // Then Momentum and time of flight for each track are smeared
  41 // according to known experimental resolution (all sources of error
  42 // have been token into account).
  43 // Let consider now only one set of 10 tracks (the algorithm is the
  44 // same for all sets).
  45 // Assuming the (mass) hypothesis that each track can be AUT a pion,
  46 // AUT a kaon, AUT a proton, we consider all the 3 at 10 possible
  47 // cases.
  48 // For each track in each (mass) configuration
  49 // (a configuration can be
  50 // e.g. pion/pion/kaon/proton/pion/proton/kaon/kaon/pion/pion)
  51 // we calculate the time zero (we know in fact the velocity of the
  52 // track after the assumption about its mass, the time of flight given
  53 // by the TOF, and the corresponding path travelled till the TOF
  54 // detector). Then for each mass configuration we have 10 time zero
  55 // and we can calculate the ChiSquare for the current configuration
  56 // using the weighted mean over all 10 time zero.
  57 // We call the best assignment the mass configuration that gives the
  58 // minimum value of the ChiSquare.
  59 // We plot the weighted mean over all 10 time zero for the best
  60 // assignment, the ChiSquare for the best assignment and the
  61 // corresponding confidence level.
  62 // The strong assumption is the MC selection of primary particles. It
  63 // will be introduced in the future also some more realistic
  64 // simulation about this point.
  65 //
  66 // Use case:
  67 // root [0] AliTOFT0 * tzero = new AliTOFT0("galice.root")
  68 // Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
  69 // root [1] tzero->ExecuteTask()
  70 // root [2] tzero->ExecuteTask("tim")
  71 //             // available parameters:
  72 //             tim - print benchmarking information
  73 //             all - print usefull informations about the number of
  74 //                   misidentified tracks and a comparison about the
  75 //                   true configuration (known from MC) and the best
  76 //                   assignment
  77 //
  78 //-- Author: F. Pierella
  79 //
  80 //_________________________________________________________________________
  81
  82 #include "TCanvas.h"
  83 #include "TClonesArray.h"
  84 #include "TFile.h"
  85 #include "TFolder.h"
  86 #include "TFrame.h"
  87 #include "TH1.h"
  88 #include "TParticle.h"
  89 #include "TRandom.h"
  90 #include "TBenchmark.h"
  91 #include "TSystem.h"
  92 #include "TTask.h"
  93 #include "TTree.h"
  94
  95 #include "AliMC.h"
  96 #include "AliRun.h"
  97
  98 #include "AliTOFhitT0.h"
  99 #include "AliTOFT0.h"
 100 #include "AliTOF.h"
 101
 102 extern TBenchmark *gBenchmark;
 103 extern TSystem *gSystem;
 104 extern TRandom *gRandom;
 105 extern TROOT *gROOT;
 106
 107 extern AliRun *gAlice;
 108
 109
 110 ClassImp(AliTOFT0)
 111
 112 //____________________________________________________________________________
 113   AliTOFT0::AliTOFT0():TTask("AliTOFT0","")
 114 {
 115   // ctor
 116   fNevents = 0 ;
 117 }
 118
 119 //____________________________________________________________________________
 120   AliTOFT0::AliTOFT0(char* headerFile, Int_t nEvents):TTask("AliTOFT0","")
 121 {
 122   //
 123   //
 124   //
 125
 126   fNevents=nEvents ; // Number of events for which calculate the T0,
 127                      // default 0: it means all evens in current file
 128   fLowerMomBound=1.5; // [GeV/c] default value
 129   fUpperMomBound=2. ; // [GeV/c] default value
 130   fTimeResolution   = 1.2e-10; // 120 ps by default
 131   fHeadersFile = headerFile ;
 132
 133   TFile * file = (TFile*) gROOT->GetFile(fHeadersFile.Data() ) ;
 134
 135   //File was not opened yet
 136   if(file == 0){
 137     if(fHeadersFile.Contains("rfio"))
 138       file =    TFile::Open(fHeadersFile,"update") ;
 139     else
 140       file = new TFile(fHeadersFile.Data(),"update") ;
 141     gAlice = (AliRun *) file->Get("gAlice") ;
 142   }
 143
 144   // add Task to //root/Tasks folder
 145   TTask * roottasks = (TTask*)gROOT->GetRootFolder()->FindObject("Tasks") ;
 146   roottasks->Add(this) ;
 147 }
 148
 149 //____________________________________________________________________________
 150   AliTOFT0::AliTOFT0(const AliTOFT0 & tzero):TTask("AliTOFT0","")
 151 {
 152   // copy ctr
 153
 154 ( (AliTOFT0 &)tzero ).Copy(*this);
 155 }
 156
 157 //____________________________________________________________________________
 158   AliTOFT0::~AliTOFT0()
 159 {
 160   // dtor
 161 }
 162
 163 //____________________________________________________________________________
 164 void AliTOFT0::Exec(Option_t *option)
 165 {
 166   //
 167   // calculate T0 distribution for all events using chisquare
 168   //
 169   Int_t ngood=0;
 170   Int_t nmisidentified=0;
 171   Int_t nmisidentified0=0;
 172   Int_t nmisidentified1=0;
 173   Int_t nmisidentified2=0;
 174   Int_t nmisidentified3=0;
 175   Int_t nmisidentified4=0;
 176   Int_t nmisidentified5=0;
 177   Int_t nmisidentified6=0;
 178   Int_t nmisidentified7=0;
 179   Int_t nmisidentified8=0;
 180   Int_t nmisidentified9=0;
 181   Int_t ipartold = -1;
 182   Int_t ipart;
 183   Int_t selected=0;
 184   Int_t istop=0;
 185   Float_t timeresolutioninns=fTimeResolution*(1.e+9); // convert in [ns]
 186   const Int_t kUPDATE = 5; // for visual option
 187   Int_t itimes=0;
 188   TCanvas* c1=0;
 189   TCanvas* c2=0;
 190   TCanvas* c3=0;
 191
 192   if(strstr(option,"visual")){
 193     // Create a new canvas.
 194     //c1 = new TCanvas("c1","Dynamic Visual Filling of time zero histo",10,10,500,500);
 195     c1 = new TCanvas("c1","Dynamic Visual Filling of time zero histo",10,10,370,370);
 196     c1->SetFillColor(35);
 197     c1->GetFrame()->SetFillColor(21);
 198     c1->GetFrame()->SetBorderSize(6);
 199     c1->GetFrame()->SetBorderMode(-1);
 200
 201     //c2 = new TCanvas("c2","Dynamic Visual Filling of chisquare histo",550,10,500,500);
 202     c2 = new TCanvas("c2","Dynamic Visual Filling of chisquare histo",380,10,370,370);
 203     c2->SetFillColor(35);
 204     c2->GetFrame()->SetFillColor(21);
 205     c2->GetFrame()->SetBorderSize(6);
 206     c2->GetFrame()->SetBorderMode(-1);
 207
 208     //c3 = new TCanvas("c3","Dynamic Visual Filling of confidence level histo",280,550,500,500);
 209     c3 = new TCanvas("c3","Dynamic Visual Filling of confidence level histo",760,10,370,370);
 210     c3->SetFillColor(35);
 211     c3->GetFrame()->SetFillColor(21);
 212     c3->GetFrame()->SetBorderSize(6);
 213     c3->GetFrame()->SetBorderMode(-1);
 214   }
 215
 216   if(strstr(option,"tim") || strstr(option,"all"))
 217     gBenchmark->Start("TOFT0");
 218
 219   TH1F *htzerobest= new TH1F("htzerobest","T0 for best assignment",200,-1.,1.);
 220   TH1F* hchibest  = new TH1F("hchibest","ChiSquare Min Distribution",80,0.,40.);
 221   TH1F* hchibestconflevel  = new TH1F("hchibestconflevel","ChiSquare Min Confidence Level",10,0.,1.);
 222
 223   // setting histo colors
 224   if(strstr(option,"visual")){
 225     htzerobest->SetFillColor(48);
 226     hchibest->SetFillColor(50);
 227     hchibestconflevel->SetFillColor(52);
 228   }
 229
 230   Int_t   assparticle[10]={3,3,3,3,3,3,3,3,3,3};
 231   Int_t   truparticle[10]={3,3,3,3,3,3,3,3,3,3};
 232   Float_t t0best=999.;
 233   Float_t timeofflight[10]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
 234   Float_t momentum[10]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
 235   Float_t timezero[10];
 236   Float_t weightedtimezero[10];
 237   Float_t beta[10]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
 238   Float_t sqMomError[10]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
 239   Float_t sqTrackError[10]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
 240   Float_t massarray[3]={0.13957,0.493677,0.9382723};
 241   Float_t dummychisquare=0.;
 242   Float_t chisquare=999.;
 243   Float_t tracktoflen[10]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
 244
 245   AliTOF *detTOF = (AliTOF *) gAlice->GetDetector ("TOF");
 246
 247   if (!detTOF) {
 248     Error("AliTOFT0","TOF not found");
 249     return;
 250   }
 251
 252   if(strstr(option,"all")){
 253     AliInfo(Form("Selecting primary tracks with momentum between %d GeV/c and %d GeV/c",  fLowerMomBound, fUpperMomBound));
 254     AliInfo("Memorandum: 0 means PION | 1 means KAON | 2 means PROTON")
 255   }
 256
 257   if (fNevents == 0) fNevents = (Int_t) gAlice->TreeE()->GetEntries();
 258
 259   for (Int_t ievent = 0; ievent < fNevents; ievent++) {
 260     gAlice->GetEvent(ievent);
 261     TTree *hitTree = detTOF->TreeH ();
 262     if (!hitTree)
 263       return;
 264     TParticle*    particle;
 265     AliTOFhitT0*  tofHit;
 266     TClonesArray* tofHits = detTOF->Hits();
 267
 268     Int_t lasttrack=-1;
 269     Int_t nset=0;
 270
 271     hitTree->SetBranchStatus("*",0); // switch off all branches
 272     hitTree->SetBranchStatus("TOF*",1); // switch on only TOF
 273
 274     // Start loop on primary tracks in the hits containers
 275
 276     Int_t ntracks = static_cast<Int_t>(hitTree->GetEntries());
 277     for (Int_t track = 0; track < ntracks; track++)
 278     {
 279       if(nset>=5) break; // check on the number of set analyzed
 280
 281       gAlice->ResetHits();
 282       hitTree->GetEvent(track);
 283
 284       AliMC *mcApplication = (AliMC*)gAlice->GetMCApp();
 285
 286       particle = mcApplication->Particle(track);
 287       Int_t nhits = tofHits->GetEntriesFast();
 288
 289       for (Int_t hit = 0; hit < nhits; hit++)
 290       {
 291         tofHit = (AliTOFhitT0 *) tofHits->UncheckedAt(hit);
 292         ipart    = tofHit->GetTrack();
 293         // check to discard the case when the same particle is selected more than one
 294         // time
 295
 296         if (ipart != ipartold){
 297
 298           particle = (TParticle*)gAlice->GetMCApp()->Particle(ipart);
 299
 300           Float_t idealtime=tofHit->GetTof();
 301           //       Float_t time=idealtime;
 302           Float_t time   = gRandom->Gaus(idealtime, fTimeResolution);
 303           Float_t toflen=tofHit->GetLen();
 304           toflen=toflen/100.; // toflen given in m
 305           Int_t pdg   = particle->GetPdgCode();
 306           Int_t abspdg   =TMath::Abs(pdg);
 307           Float_t idealmom  = particle->P();
 308           Float_t momres=idealmom*0.025; // 2.5% res token into account for all momenta
 309           Float_t mom =gRandom->Gaus(idealmom,momres);
 310
 311           Bool_t isgoodpart=(abspdg==211 || abspdg==2212 || abspdg==321);
 312
 313           time*=1.E+9; // tof given in nanoseconds
 314           if (particle->GetFirstMother() < 0 && isgoodpart && mom<=fUpperMomBound && mom>=fLowerMomBound){
 315             selected+=1;
 316             istop=selected;
 317             if(istop>10) break;
 318             Int_t index=selected-1;
 319             timeofflight[index]=time;
 320             tracktoflen[index]=toflen;
 321             momentum[index]=mom;
 322             //AliInfo(Form(" %d  %d  %d ", timeofflight[index], tracktoflen[index], momentum[index]));
 323             switch (abspdg) {
 324             case 211:
 325               truparticle[index]=0;
 326               break ;
 327             case 321:
 328               truparticle[index]=1;
 329               break ;
 330             case 2212:
 331               truparticle[index]=2;
 332               break ;
 333             }
 334
 335           }
 336           ipartold = ipart;
 337
 338           if(istop==10){ // start analysis on current set
 339             nset+=1;
 340             lasttrack=track;
 341             istop=0;
 342             selected=0;
 343             //AliInfo("starting t0 calculation for current set");
 344             for (Int_t i1=0; i1<3;i1++) {
 345               beta[0]=momentum[0]/sqrt(massarray[i1]*massarray[i1]+momentum[0]*momentum[0]);
 346               for (Int_t i2=0; i2<3;i2++) {
 347                 beta[1]=momentum[1]/sqrt(massarray[i2]*massarray[i2]+momentum[1]*momentum[1]);
 348                 for (Int_t i3=0; i3<3;i3++) {
 349                   beta[2]=momentum[2]/sqrt(massarray[i3]*massarray[i3]+momentum[2]*momentum[2]);
 350                   for (Int_t i4=0; i4<3;i4++) {
 351                     beta[3]=momentum[3]/sqrt(massarray[i4]*massarray[i4]+momentum[3]*momentum[3]);
 352                     for (Int_t i5=0; i5<3;i5++) {
 353                       beta[4]=momentum[4]/sqrt(massarray[i5]*massarray[i5]+momentum[4]*momentum[4]);
 354                       for (Int_t i6=0; i6<3;i6++) {
 355                         beta[5]=momentum[5]/sqrt(massarray[i6]*massarray[i6]+momentum[5]*momentum[5]);
 356                         for (Int_t i7=0; i7<3;i7++) {
 357                           beta[6]=momentum[6]/sqrt(massarray[i7]*massarray[i7]+momentum[6]*momentum[6]);
 358                           for (Int_t i8=0; i8<3;i8++) {
 359                             beta[7]=momentum[7]/sqrt(massarray[i8]*massarray[i8]+momentum[7]*momentum[7]);
 360                             for (Int_t i9=0; i9<3;i9++) {
 361                               beta[8]=momentum[8]/sqrt(massarray[i9]*massarray[i9]+momentum[8]*momentum[8]);
 362                               for (Int_t i10=0; i10<3;i10++) {
 363                                 beta[9]=momentum[9]/sqrt(massarray[i10]*massarray[i10]+momentum[9]*momentum[9]);
 364
 365                                 Float_t meantzero=0.;
 366                                 Float_t sumAllweights=0.;
 367                                 for (Int_t itz=0; itz<10;itz++) {
 368                                   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
 369                                   sqTrackError[itz]=(timeresolutioninns*timeresolutioninns+sqMomError[itz]); // total error for the current track
 370                                   sumAllweights+=1./sqTrackError[itz];
 371
 372                                   timezero[itz]=(tracktoflen[itz]/(beta[itz]*0.299792))-timeofflight[itz];
 373                                   weightedtimezero[itz]=((tracktoflen[itz]/(beta[itz]*0.299792))-timeofflight[itz])/sqTrackError[itz];// weighted time zero for current track
 374                                   meantzero+=weightedtimezero[itz];
 375                                 } // end loop for (Int_t itz=0; itz<10;itz++)
 376                                 meantzero=meantzero/sumAllweights; // it is given in [ns]
 377
 378                                 dummychisquare=0.;
 379                                 // calculate the chisquare for the current assignment
 380                                 for (Int_t icsq=0; icsq<10;icsq++) {
 381                                   dummychisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq];
 382                                 } // end loop for (Int_t icsq=0; icsq<10;icsq++)
 383
 384                                 if(dummychisquare<=chisquare){
 385                                   assparticle[0]=i1;
 386                                   assparticle[1]=i2;
 387                                   assparticle[2]=i3;
 388                                   assparticle[3]=i4;
 389                                   assparticle[4]=i5;
 390                                   assparticle[5]=i6;
 391                                   assparticle[6]=i7;
 392                                   assparticle[7]=i8;
 393                                   assparticle[8]=i9;
 394                                   assparticle[9]=i10;
 395                                   chisquare=dummychisquare;
 396                                   t0best=meantzero;
 397                                 } // close if(dummychisquare<=chisquare)
 398
 399                               } // end loop on i10
 400                             } // end loop on i9
 401                           } // end loop on i8
 402                         } // end loop on i7
 403                       } // end loop on i6
 404                     } // end loop on i5
 405                   } // end loop on i4
 406                 } // end loop on i3
 407               } // end loop on i2
 408             } // end loop on i1
 409
 410             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]) ngood+=1;
 411             if(truparticle[0]!=assparticle[0]) nmisidentified0+=1;
 412             if(truparticle[1]!=assparticle[1]) nmisidentified1+=1;
 413             if(truparticle[2]!=assparticle[2]) nmisidentified2+=1;
 414             if(truparticle[3]!=assparticle[3]) nmisidentified3+=1;
 415             if(truparticle[4]!=assparticle[4]) nmisidentified4+=1;
 416             if(truparticle[5]!=assparticle[5]) nmisidentified5+=1;
 417             if(truparticle[6]!=assparticle[6]) nmisidentified6+=1;
 418             if(truparticle[7]!=assparticle[7]) nmisidentified7+=1;
 419             if(truparticle[8]!=assparticle[8]) nmisidentified8+=1;
 420             if(truparticle[9]!=assparticle[9]) nmisidentified9+=1;
 421             // filling histos
 422             htzerobest->Fill(t0best);
 423             hchibest->Fill(chisquare);
 424             Double_t dblechisquare=(Double_t)chisquare;
 425             Float_t confLevel=(Float_t)TMath::Prob(dblechisquare,9); // ndf 10-1=9
 426             hchibestconflevel->Fill(confLevel);
 427             itimes++;
 428             if(strstr(option,"all")){
 429               AliInfo(Form("True Assignment %d  %d  %d  %d  %d  %d  %d  %d  %d  %d", truparticle[0], truparticle[1], truparticle[2], truparticle[3], truparticle[4], truparticle[5], truparticle[6], truparticle[7], truparticle[8], truparticle[9]));
 430               AliInfo(Form("Best Assignment %d  %d  %d  %d  %d  %d  %d  %d  %d  %d", assparticle[0], assparticle[1], assparticle[2], assparticle[3], assparticle[4], assparticle[5], assparticle[6], assparticle[7], assparticle[8], assparticle[9]));
 431               AliInfo(Form("Minimum ChiSquare for current set   %d ", chisquare));
 432               AliInfo(Form("Confidence Level (Minimum ChiSquare) %d", confLevel));
 433             }
 434             if (strstr(option,"visual") && itimes && (itimes%kUPDATE) == 0) {
 435               if (itimes == kUPDATE){
 436                 c1->cd();
 437                 htzerobest->Draw();
 438                 c2->cd();
 439                 hchibest->Draw();
 440                 c3->cd();
 441                 hchibestconflevel->Draw();
 442               }
 443               c1->Modified();
 444               c1->Update();
 445               c2->Modified();
 446               c2->Update();
 447               c3->Modified();
 448               c3->Update();
 449               if (gSystem->ProcessEvents())
 450                 break;
 451             }
 452             chisquare=999.;
 453             t0best=999.;
 454
 455           } // end for the current set. close if(istop==5)
 456         } // end condition on ipartold
 457       } // end loop on hits for the current track
 458       if(istop>=10) break;
 459     } // end loop on ntracks
 460   } //event loop
 461
 462   if(strstr(option,"all")){
 463     nmisidentified=(nmisidentified0+nmisidentified1+nmisidentified2+nmisidentified3+nmisidentified4+nmisidentified5+nmisidentified6+nmisidentified7+nmisidentified8+nmisidentified9);
 464     AliInfo(Form("total number of tracks token into account  %i", 10*5*fNevents));
 465     Float_t badPercentage=100.*(Float_t)nmisidentified/(10*5*fNevents);
 466     AliInfo(Form("total misidentified                       %i (%d %) ", nmisidentified, badPercentage));
 467     AliInfo(Form("Total Number of set token into account     %i", 5*fNevents));
 468     Float_t goodSetPercentage=100.*(Float_t)ngood/(5*fNevents);
 469     AliInfo(Form("Number of set with no misidentified tracks %i (%d %)", ngood, goodSetPercentage));
 470   }
 471
 472   // free used memory for canvas
 473   delete c1; c1=0;
 474   delete c2; c2=0;
 475   delete c3; c3=0;
 476
 477   // generating output filename only if not previously specified using SetTZeroFile
 478   char outFileName[70];
 479   strcpy(outFileName,"ht010tr120ps"); // global time resolution has to be converted from Int_t to char
 480                                       // in order to have in the output filename this parameter
 481   strcat(outFileName,fHeadersFile);
 482
 483   if(fT0File.IsNull()) fT0File=outFileName;
 484
 485   TFile* houtfile = new TFile(fT0File,"recreate");
 486   houtfile->cd();
 487   htzerobest->Write(0,TObject::kOverwrite);
 488   hchibest->Write(0,TObject::kOverwrite);
 489   hchibestconflevel->Write(0,TObject::kOverwrite);
 490   houtfile->Close();
 491
 492
 493   if(strstr(option,"tim") || strstr(option,"all")){
 494     gBenchmark->Stop("TOFT0");
 495     AliInfo("AliTOFT0:");
 496     /*
 497     cout << "   took " << gBenchmark->GetCpuTime("TOFT0") << " seconds in order to calculate T0 "
 498          << gBenchmark->GetCpuTime("TOFT0")/fNevents << " seconds per event " << endl ;
 499     */
 500     gBenchmark->Print("TOFT0");
 501   }
 502 }
 503
 504 //__________________________________________________________________
 505 void AliTOFT0::SetTZeroFile(char * file )
 506 {
 507   //
 508   //
 509   //
 510   printf("Destination file : %s \n", file) ;
 511   fT0File=file;
 512
 513 }
 514
 515 //__________________________________________________________________
 516 void AliTOFT0::Print(Option_t* /*option*/)const
 517 {
 518   //
 519   //
 520   //
 521   printf("------------------- %s -------------\n", GetName()) ;
 522   if(!fT0File.IsNull())
 523     printf("  Writing T0 Distribution to file  %s \n",(char*) fT0File.Data());
 524
 525 }
 526
 527 //__________________________________________________________________
 528 Bool_t AliTOFT0::operator==( AliTOFT0 const &tzero )const
 529 {
 530   //
 531   // Equal operator
 532   //
 533
 534   if( (fTimeResolution==tzero.fTimeResolution)&&(fLowerMomBound==tzero.fLowerMomBound)&&(fUpperMomBound==tzero.fUpperMomBound))
 535     return kTRUE ;
 536   else
 537     return kFALSE ;
 538 }