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 <TBenchmark.h>
  90 #include <TTask.h>
  91 #include <TTree.h>
  92 #include <TRandom.h>
  93 #include <TROOT.h>
  94
  95 #include "AliLoader.h"
  96 #include "AliMC.h"
  97 #include "AliRun.h"
  98
  99 #include "AliTOFhitT0.h"
 100 #include "AliTOFT0.h"
 101 #include "AliTOF.h"
 102
 103 extern TROOT *gROOT;
 104 extern TRandom *gRandom;
 105 extern TBenchmark *gBenchmark;
 106
 107 extern AliRun *gAlice;
 108
 109 ClassImp(AliTOFT0)
 110
 111 //____________________________________________________________________________
 112 AliTOFT0::AliTOFT0():
 113   TTask("AliTOFT0",""),
 114   fNevents(0),
 115   fTimeResolution(0),
 116   fLowerMomBound(0),
 117   fUpperMomBound(0),
 118   fT0File(""),
 119   fHeadersFile("")
 120 {
 121   // ctor
 122 }
 123
 124 //____________________________________________________________________________
 125 AliTOFT0::AliTOFT0(char* headerFile, Int_t nEvents):
 126   TTask("AliTOFT0",""),
 127   fNevents(nEvents),
 128   fTimeResolution(1.2e-10),
 129   fLowerMomBound(1.5),
 130   fUpperMomBound(2.),
 131   fT0File(""),
 132   fHeadersFile(headerFile)
 133 {
 134   //
 135   //
 136   //
 137
 138   //fNevents=nEvents ; // Number of events for which calculate the T0,
 139                      // default 0: it means all evens in current file
 140   //fLowerMomBound=1.5; // [GeV/c] default value
 141   //fUpperMomBound=2. ; // [GeV/c] default value
 142   //fTimeResolution   = 1.2e-10; // 120 ps by default
 143   //fHeadersFile = headerFile ;
 144
 145   TFile * file = (TFile*) gROOT->GetFile(fHeadersFile.Data() ) ;
 146
 147   //File was not opened yet
 148   if(file == 0){
 149     if(fHeadersFile.Contains("rfio"))
 150       file =    TFile::Open(fHeadersFile,"update") ;
 151     else
 152       file = new TFile(fHeadersFile.Data(),"update") ;
 153     gAlice = (AliRun *) file->Get("gAlice") ;
 154   }
 155
 156   // add Task to //root/Tasks folder
 157   TTask * roottasks = (TTask*)gROOT->GetRootFolder()->FindObject("Tasks") ;
 158   roottasks->Add(this) ;
 159 }
 160
 161 //____________________________________________________________________________
 162 AliTOFT0::AliTOFT0(const AliTOFT0 & tzero):
 163   TTask("AliTOFT0",""),
 164   fNevents(0),
 165   fTimeResolution(0),
 166   fLowerMomBound(0),
 167   fUpperMomBound(0),
 168   fT0File(""),
 169   fHeadersFile("")
 170 {
 171   // copy ctr
 172
 173 ( (AliTOFT0 &)tzero ).Copy(*this);
 174 }
 175
 176 //____________________________________________________________________________
 177   AliTOFT0::~AliTOFT0()
 178 {
 179   // dtor
 180 }
 181
 182 //____________________________________________________________________________
 183 void AliTOFT0::Exec(Option_t *option)
 184 {
 185   //
 186   // calculate T0 distribution for all events using chisquare
 187   //
 188   Int_t ngood=0;
 189   Int_t nmisidentified=0;
 190   Int_t nmisidentified0=0;
 191   Int_t nmisidentified1=0;
 192   Int_t nmisidentified2=0;
 193   Int_t nmisidentified3=0;
 194   Int_t nmisidentified4=0;
 195   Int_t nmisidentified5=0;
 196   Int_t nmisidentified6=0;
 197   Int_t nmisidentified7=0;
 198   Int_t nmisidentified8=0;
 199   Int_t nmisidentified9=0;
 200   Int_t ipartold = -1;
 201   Int_t ipart;
 202   Int_t selected=0;
 203   Int_t istop=0;
 204   Float_t timeresolutioninns=fTimeResolution*(1.e+9); // convert in [ns]
 205   const Int_t kUPDATE = 5; // for visual option
 206   Int_t itimes=0;
 207   TCanvas* c1=0;
 208   TCanvas* c2=0;
 209   TCanvas* c3=0;
 210
 211   if(strstr(option,"visual")){
 212     // Create a new canvas.
 213     //c1 = new TCanvas("c1","Dynamic Visual Filling of time zero histo",10,10,500,500);
 214     c1 = new TCanvas("c1","Dynamic Visual Filling of time zero histo",10,10,370,370);
 215     c1->SetFillColor(35);
 216     c1->GetFrame()->SetFillColor(21);
 217     c1->GetFrame()->SetBorderSize(6);
 218     c1->GetFrame()->SetBorderMode(-1);
 219
 220     //c2 = new TCanvas("c2","Dynamic Visual Filling of chisquare histo",550,10,500,500);
 221     c2 = new TCanvas("c2","Dynamic Visual Filling of chisquare histo",380,10,370,370);
 222     c2->SetFillColor(35);
 223     c2->GetFrame()->SetFillColor(21);
 224     c2->GetFrame()->SetBorderSize(6);
 225     c2->GetFrame()->SetBorderMode(-1);
 226
 227     //c3 = new TCanvas("c3","Dynamic Visual Filling of confidence level histo",280,550,500,500);
 228     c3 = new TCanvas("c3","Dynamic Visual Filling of confidence level histo",760,10,370,370);
 229     c3->SetFillColor(35);
 230     c3->GetFrame()->SetFillColor(21);
 231     c3->GetFrame()->SetBorderSize(6);
 232     c3->GetFrame()->SetBorderMode(-1);
 233   }
 234
 235   if(strstr(option,"tim") || strstr(option,"all"))
 236     gBenchmark->Start("TOFT0");
 237
 238   TH1F *htzerobest= new TH1F("htzerobest","T0 for best assignment",200,-1.,1.);
 239   TH1F* hchibest  = new TH1F("hchibest","ChiSquare Min Distribution",80,0.,40.);
 240   TH1F* hchibestconflevel  = new TH1F("hchibestconflevel","ChiSquare Min Confidence Level",10,0.,1.);
 241
 242   // setting histo colors
 243   if(strstr(option,"visual")){
 244     htzerobest->SetFillColor(48);
 245     hchibest->SetFillColor(50);
 246     hchibestconflevel->SetFillColor(52);
 247   }
 248
 249   Int_t   assparticle[10]={3,3,3,3,3,3,3,3,3,3};
 250   Int_t   truparticle[10]={3,3,3,3,3,3,3,3,3,3};
 251   Float_t t0best=999.;
 252   Float_t timeofflight[10]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
 253   Float_t momentum[10]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
 254   Float_t timezero[10];
 255   Float_t weightedtimezero[10];
 256   Float_t beta[10]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
 257   Float_t sqMomError[10]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
 258   Float_t sqTrackError[10]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
 259   Float_t massarray[3]={0.13957,0.493677,0.9382723};
 260   Float_t dummychisquare=0.;
 261   Float_t chisquare=999.;
 262   Float_t tracktoflen[10]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
 263
 264   AliTOF *detTOF = (AliTOF *) gAlice->GetDetector ("TOF");
 265
 266   if (!detTOF) {
 267     Error("AliTOFT0","TOF not found");
 268     return;
 269   }
 270
 271   if(strstr(option,"all")){
 272     AliInfo(Form("Selecting primary tracks with momentum between %f GeV/c and %f GeV/c",  fLowerMomBound, fUpperMomBound));
 273     AliInfo("Memorandum: 0 means PION | 1 means KAON | 2 means PROTON");
 274   }
 275
 276   if (fNevents == 0) fNevents = (Int_t) AliRunLoader::Instance()->TreeE()->GetEntries();
 277
 278   for (Int_t ievent = 0; ievent < fNevents; ievent++) {
 279     gAlice->GetEvent(ievent);
 280     TTree *hitTree = detTOF->GetLoader()->TreeH ();
 281     if (!hitTree)
 282       return;
 283     TParticle*    particle;
 284     AliTOFhitT0*  tofHit;
 285     TClonesArray* tofHits = detTOF->Hits();
 286
 287     Int_t lasttrack=-1;
 288     Int_t nset=0;
 289
 290     hitTree->SetBranchStatus("*",0); // switch off all branches
 291     hitTree->SetBranchStatus("TOF*",1); // switch on only TOF
 292
 293     // Start loop on primary tracks in the hits containers
 294
 295     Int_t ntracks = static_cast<Int_t>(hitTree->GetEntries());
 296     for (Int_t track = 0; track < ntracks; track++)
 297     {
 298       if(nset>=5) break; // check on the number of set analyzed
 299
 300       gAlice->GetMCApp()->ResetHits();
 301       hitTree->GetEvent(track);
 302
 303       //AliMC *mcApplication = (AliMC*)gAlice->GetMCApp();
 304
 305       //particle = mcApplication->Particle(track);
 306       Int_t nhits = tofHits->GetEntriesFast();
 307
 308       for (Int_t hit = 0; hit < nhits; hit++)
 309       {
 310         tofHit = (AliTOFhitT0 *) tofHits->UncheckedAt(hit);
 311         ipart    = tofHit->GetTrack();
 312         // check to discard the case when the same particle is selected more than one
 313         // time
 314
 315         if (ipart != ipartold){
 316
 317           particle = (TParticle*)gAlice->GetMCApp()->Particle(ipart);
 318
 319           Float_t idealtime=tofHit->GetTof();
 320           //       Float_t time=idealtime;
 321           Float_t time   = gRandom->Gaus(idealtime, fTimeResolution);
 322           Float_t toflen=tofHit->GetLen();
 323           toflen=toflen/100.; // toflen given in m
 324           Int_t pdg   = particle->GetPdgCode();
 325           Int_t abspdg   =TMath::Abs(pdg);
 326           Float_t idealmom  = particle->P();
 327           Float_t momres=idealmom*0.025; // 2.5% res token into account for all momenta
 328           Float_t mom =gRandom->Gaus(idealmom,momres);
 329
 330           Bool_t isgoodpart=(abspdg==211 || abspdg==2212 || abspdg==321);
 331
 332           time*=1.E+9; // tof given in nanoseconds
 333           if (particle->GetFirstMother() < 0 && isgoodpart && mom<=fUpperMomBound && mom>=fLowerMomBound){
 334             selected+=1;
 335             istop=selected;
 336             if(istop>10) break;
 337             Int_t index=selected-1;
 338             timeofflight[index]=time;
 339             tracktoflen[index]=toflen;
 340             momentum[index]=mom;
 341             //AliInfo(Form(" %d  %d  %d ", timeofflight[index], tracktoflen[index], momentum[index]));
 342             switch (abspdg) {
 343             case 211:
 344               truparticle[index]=0;
 345               break ;
 346             case 321:
 347               truparticle[index]=1;
 348               break ;
 349             case 2212:
 350               truparticle[index]=2;
 351               break ;
 352             }
 353
 354           }
 355           ipartold = ipart;
 356
 357           if(istop==10){ // start analysis on current set
 358             nset+=1;
 359             lasttrack=track;
 360             istop=0;
 361             selected=0;
 362             //AliInfo("starting t0 calculation for current set");
 363             for (Int_t i1=0; i1<3;i1++) {
 364               beta[0]=momentum[0]/sqrt(massarray[i1]*massarray[i1]+momentum[0]*momentum[0]);
 365               for (Int_t i2=0; i2<3;i2++) {
 366                 beta[1]=momentum[1]/sqrt(massarray[i2]*massarray[i2]+momentum[1]*momentum[1]);
 367                 for (Int_t i3=0; i3<3;i3++) {
 368                   beta[2]=momentum[2]/sqrt(massarray[i3]*massarray[i3]+momentum[2]*momentum[2]);
 369                   for (Int_t i4=0; i4<3;i4++) {
 370                     beta[3]=momentum[3]/sqrt(massarray[i4]*massarray[i4]+momentum[3]*momentum[3]);
 371                     for (Int_t i5=0; i5<3;i5++) {
 372                       beta[4]=momentum[4]/sqrt(massarray[i5]*massarray[i5]+momentum[4]*momentum[4]);
 373                       for (Int_t i6=0; i6<3;i6++) {
 374                         beta[5]=momentum[5]/sqrt(massarray[i6]*massarray[i6]+momentum[5]*momentum[5]);
 375                         for (Int_t i7=0; i7<3;i7++) {
 376                           beta[6]=momentum[6]/sqrt(massarray[i7]*massarray[i7]+momentum[6]*momentum[6]);
 377                           for (Int_t i8=0; i8<3;i8++) {
 378                             beta[7]=momentum[7]/sqrt(massarray[i8]*massarray[i8]+momentum[7]*momentum[7]);
 379                             for (Int_t i9=0; i9<3;i9++) {
 380                               beta[8]=momentum[8]/sqrt(massarray[i9]*massarray[i9]+momentum[8]*momentum[8]);
 381                               for (Int_t i10=0; i10<3;i10++) {
 382                                 beta[9]=momentum[9]/sqrt(massarray[i10]*massarray[i10]+momentum[9]*momentum[9]);
 383
 384                                 Float_t meantzero=0.;
 385                                 Float_t sumAllweights=0.;
 386                                 for (Int_t itz=0; itz<10;itz++) {
 387                                   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
 388                                   sqTrackError[itz]=(timeresolutioninns*timeresolutioninns+sqMomError[itz]); // total error for the current track
 389                                   sumAllweights+=1./sqTrackError[itz];
 390
 391                                   timezero[itz]=(tracktoflen[itz]/(beta[itz]*0.299792))-timeofflight[itz];
 392                                   weightedtimezero[itz]=((tracktoflen[itz]/(beta[itz]*0.299792))-timeofflight[itz])/sqTrackError[itz];// weighted time zero for current track
 393                                   meantzero+=weightedtimezero[itz];
 394                                 } // end loop for (Int_t itz=0; itz<10;itz++)
 395                                 meantzero=meantzero/sumAllweights; // it is given in [ns]
 396
 397                                 dummychisquare=0.;
 398                                 // calculate the chisquare for the current assignment
 399                                 for (Int_t icsq=0; icsq<10;icsq++) {
 400                                   dummychisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq];
 401                                 } // end loop for (Int_t icsq=0; icsq<10;icsq++)
 402
 403                                 if(dummychisquare<=chisquare){
 404                                   assparticle[0]=i1;
 405                                   assparticle[1]=i2;
 406                                   assparticle[2]=i3;
 407                                   assparticle[3]=i4;
 408                                   assparticle[4]=i5;
 409                                   assparticle[5]=i6;
 410                                   assparticle[6]=i7;
 411                                   assparticle[7]=i8;
 412                                   assparticle[8]=i9;
 413                                   assparticle[9]=i10;
 414                                   chisquare=dummychisquare;
 415                                   t0best=meantzero;
 416                                 } // close if(dummychisquare<=chisquare)
 417
 418                               } // end loop on i10
 419                             } // end loop on i9
 420                           } // end loop on i8
 421                         } // end loop on i7
 422                       } // end loop on i6
 423                     } // end loop on i5
 424                   } // end loop on i4
 425                 } // end loop on i3
 426               } // end loop on i2
 427             } // end loop on i1
 428
 429             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;
 430             if(truparticle[0]!=assparticle[0]) nmisidentified0+=1;
 431             if(truparticle[1]!=assparticle[1]) nmisidentified1+=1;
 432             if(truparticle[2]!=assparticle[2]) nmisidentified2+=1;
 433             if(truparticle[3]!=assparticle[3]) nmisidentified3+=1;
 434             if(truparticle[4]!=assparticle[4]) nmisidentified4+=1;
 435             if(truparticle[5]!=assparticle[5]) nmisidentified5+=1;
 436             if(truparticle[6]!=assparticle[6]) nmisidentified6+=1;
 437             if(truparticle[7]!=assparticle[7]) nmisidentified7+=1;
 438             if(truparticle[8]!=assparticle[8]) nmisidentified8+=1;
 439             if(truparticle[9]!=assparticle[9]) nmisidentified9+=1;
 440             // filling histos
 441             htzerobest->Fill(t0best);
 442             hchibest->Fill(chisquare);
 443             Double_t dblechisquare=(Double_t)chisquare;
 444             Float_t confLevel=(Float_t)TMath::Prob(dblechisquare,9); // ndf 10-1=9
 445             hchibestconflevel->Fill(confLevel);
 446             itimes++;
 447             if(strstr(option,"all")){
 448               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]));
 449               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]));
 450               AliInfo(Form("Minimum ChiSquare for current set   %f ", chisquare));
 451               AliInfo(Form("Confidence Level (Minimum ChiSquare) %f", confLevel));
 452             }
 453             if (strstr(option,"visual") && itimes && (itimes%kUPDATE) == 0) {
 454               if (itimes == kUPDATE){
 455                 c1->cd();
 456                 htzerobest->Draw();
 457                 c2->cd();
 458                 hchibest->Draw();
 459                 c3->cd();
 460                 hchibestconflevel->Draw();
 461               }
 462               c1->Modified();
 463               c1->Update();
 464               c2->Modified();
 465               c2->Update();
 466               c3->Modified();
 467               c3->Update();
 468               if (gSystem->ProcessEvents())
 469                 break;
 470             }
 471             chisquare=999.;
 472             t0best=999.;
 473
 474           } // end for the current set. close if(istop==5)
 475         } // end condition on ipartold
 476       } // end loop on hits for the current track
 477       if(istop>=10) break;
 478     } // end loop on ntracks
 479   } //event loop
 480
 481   if(strstr(option,"all")){
 482     nmisidentified=(nmisidentified0+nmisidentified1+nmisidentified2+nmisidentified3+nmisidentified4+nmisidentified5+nmisidentified6+nmisidentified7+nmisidentified8+nmisidentified9);
 483     AliInfo(Form("total number of tracks token into account  %i", 10*5*fNevents));
 484     Float_t badPercentage=100.*(Float_t)nmisidentified/(10*5*fNevents);
 485     AliInfo(Form("total misidentified                       %i (%f %%) ", nmisidentified, badPercentage));
 486     AliInfo(Form("Total Number of set token into account     %i", 5*fNevents));
 487     Float_t goodSetPercentage=100.*(Float_t)ngood/(5*fNevents);
 488     AliInfo(Form("Number of set with no misidentified tracks %i (%f %%)", ngood, goodSetPercentage));
 489   }
 490
 491   // free used memory for canvas
 492   delete c1; c1=0;
 493   delete c2; c2=0;
 494   delete c3; c3=0;
 495
 496   // generating output filename only if not previously specified using SetTZeroFile
 497
 498   /*const*/ Int_t kSize = 70+fHeadersFile.Length()+1;
 499   char outFileName[kSize];
 500   strncpy(outFileName,"ht010tr120ps",kSize); // global time resolution has to be converted from Int_t to char
 501                                       // in order to have in the output filename this parameter
 502   strncat(outFileName,fHeadersFile,kSize);
 503
 504   if(fT0File.IsNull()) fT0File=outFileName;
 505
 506   TFile* houtfile = new TFile(fT0File,"recreate");
 507   houtfile->cd();
 508   htzerobest->Write(0,TObject::kOverwrite);
 509   hchibest->Write(0,TObject::kOverwrite);
 510   hchibestconflevel->Write(0,TObject::kOverwrite);
 511   houtfile->Close();
 512
 513
 514   if(strstr(option,"tim") || strstr(option,"all")){
 515     gBenchmark->Stop("TOFT0");
 516     AliInfo("AliTOFT0:");
 517     /*
 518     cout << "   took " << gBenchmark->GetCpuTime("TOFT0") << " seconds in order to calculate T0 "
 519          << gBenchmark->GetCpuTime("TOFT0")/fNevents << " seconds per event " << endl ;
 520     */
 521     gBenchmark->Print("TOFT0");
 522   }
 523 }
 524
 525 //__________________________________________________________________
 526 void AliTOFT0::SetTZeroFile(char * file )
 527 {
 528   //
 529   // Set T0 file name
 530   //
 531   printf("Destination file : %s \n", file) ;
 532   fT0File=file;
 533
 534 }
 535
 536 //__________________________________________________________________
 537 void AliTOFT0::Print(Option_t* /*option*/)const
 538 {
 539   //
 540   // Print class content
 541   //
 542   printf("------------------- %s -------------\n", GetName()) ;
 543   if(!fT0File.IsNull())
 544     printf("  Writing T0 Distribution to file  %s \n",(char*) fT0File.Data());
 545
 546 }
 547
 548 //__________________________________________________________________
 549 Bool_t AliTOFT0::operator==( AliTOFT0 const &tzero )const
 550 {
 551   //
 552   // Equal operator
 553   //
 554
 555   if( (fTimeResolution==tzero.fTimeResolution)&&(fLowerMomBound==tzero.fLowerMomBound)&&(fUpperMomBound==tzero.fUpperMomBound))
 556     return kTRUE ;
 557   else
 558     return kFALSE ;
 559 }