STEER/ESD/AliESDpid.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
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  15
  16 /* $Id$ */
  17
  18 //-----------------------------------------------------------------
  19 //           Implementation of the combined PID class
  20 //           For the Event Summary Data Class
  21 //           produced by the reconstruction process
  22 //           and containing information on the particle identification
  23 //      Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
  24 //-----------------------------------------------------------------
  25
  26 #include "TArrayI.h"
  27 #include "TArrayF.h"
  28
  29 #include "AliLog.h"
  30 #include "AliPID.h"
  31 #include "AliTOFHeader.h"
  32 #include "AliESDpid.h"
  33 #include "AliESDEvent.h"
  34 #include "AliESDtrack.h"
  35
  36 ClassImp(AliESDpid)
  37
  38 Int_t AliESDpid::MakePID(AliESDEvent *event, Bool_t TPConly, Float_t timeZeroTOF) const {
  39   //
  40   //  Calculate probabilities for all detectors, except if TPConly==kTRUE
  41   //  and combine PID
  42   //
  43   //   Option TPConly==kTRUE is used during reconstruction,
  44   //  because ITS tracking uses TPC pid
  45   //  HMPID and TRD pid are done in detector reconstructors
  46   //
  47
  48   /*
  49   Float_t timeZeroTOF = 0;
  50   if (subtractT0)
  51     timeZeroTOF = event->GetT0();
  52   */
  53   Int_t nTrk=event->GetNumberOfTracks();
  54   for (Int_t iTrk=0; iTrk<nTrk; iTrk++) {
  55     AliESDtrack *track=event->GetTrack(iTrk);
  56     MakeTPCPID(track);
  57     if (!TPConly) {
  58       MakeITSPID(track);
  59       MakeTOFPID(track, timeZeroTOF);
  60       //MakeHMPIDPID(track);
  61       //MakeTRDPID(track);
  62     }
  63     CombinePID(track);
  64   }
  65   return 0;
  66 }
  67 //_________________________________________________________________________
  68 void AliESDpid::MakeTPCPID(AliESDtrack *track) const
  69 {
  70   //
  71   //  TPC pid using bethe-bloch and gaussian response
  72   //
  73   if ((track->GetStatus()&AliESDtrack::kTPCin )==0)
  74     if ((track->GetStatus()&AliESDtrack::kTPCout)==0) return;
  75
  76     Double_t mom = track->GetP();
  77     const AliExternalTrackParam *in=track->GetInnerParam();
  78     if (in) mom = in->GetP();
  79
  80     Double_t p[AliPID::kSPECIES];
  81     Double_t dedx=track->GetTPCsignal();
  82     Bool_t mismatch=kTRUE, heavy=kTRUE;
  83
  84     for (Int_t j=0; j<AliPID::kSPECIES; j++) {
  85       AliPID::EParticleType type=AliPID::EParticleType(j);
  86       Double_t bethe=fTPCResponse.GetExpectedSignal(mom,type);
  87       Double_t sigma=fTPCResponse.GetExpectedSigma(mom,track->GetTPCsignalN(),type);
  88       if (TMath::Abs(dedx-bethe) > fRange*sigma) {
  89         p[j]=TMath::Exp(-0.5*fRange*fRange)/sigma;
  90       } else {
  91         p[j]=TMath::Exp(-0.5*(dedx-bethe)*(dedx-bethe)/(sigma*sigma))/sigma;
  92         mismatch=kFALSE;
  93       }
  94
  95       // Check for particles heavier than (AliPID::kSPECIES - 1)
  96       if (dedx < (bethe + fRange*sigma)) heavy=kFALSE;
  97
  98     }
  99
 100     if (mismatch)
 101        for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1./AliPID::kSPECIES;
 102
 103     track->SetTPCpid(p);
 104
 105     if (heavy) track->ResetStatus(AliESDtrack::kTPCpid);
 106
 107 }
 108 //_________________________________________________________________________
 109 void AliESDpid::MakeITSPID(AliESDtrack *track) const
 110 {
 111   //
 112   // ITS PID
 113   // Two options, depending on fITSPIDmethod:
 114   //  1) Truncated mean method
 115   //  2) Likelihood, using charges measured in all 4 layers and
 116   //     Landau+gaus response functions
 117   //
 118
 119   if ((track->GetStatus()&AliESDtrack::kITSin)==0 &&
 120       (track->GetStatus()&AliESDtrack::kITSout)==0) return;
 121
 122   Double_t mom=track->GetP();
 123   if (fITSPIDmethod == kITSTruncMean) {
 124     Double_t dedx=track->GetITSsignal();
 125     Bool_t isSA=kTRUE;
 126     Double_t momITS=mom;
 127     ULong_t trStatus=track->GetStatus();
 128     if(trStatus&AliESDtrack::kTPCin) isSA=kFALSE;
 129     UChar_t clumap=track->GetITSClusterMap();
 130     Int_t nPointsForPid=0;
 131     for(Int_t i=2; i<6; i++){
 132       if(clumap&(1<<i)) ++nPointsForPid;
 133     }
 134
 135     if(nPointsForPid<3) { // track not to be used for combined PID purposes
 136       track->ResetStatus(AliESDtrack::kITSpid);
 137       return;
 138     }
 139
 140     Double_t p[10];
 141
 142     Bool_t mismatch=kTRUE, heavy=kTRUE;
 143     for (Int_t j=0; j<AliPID::kSPECIES; j++) {
 144       Double_t mass=AliPID::ParticleMass(j);//GeV/c^2
 145       Double_t bethe=fITSResponse.Bethe(momITS,mass);
 146       Double_t sigma=fITSResponse.GetResolution(bethe,nPointsForPid,isSA);
 147       if (TMath::Abs(dedx-bethe) > fRange*sigma) {
 148         p[j]=TMath::Exp(-0.5*fRange*fRange)/sigma;
 149       } else {
 150         p[j]=TMath::Exp(-0.5*(dedx-bethe)*(dedx-bethe)/(sigma*sigma))/sigma;
 151         mismatch=kFALSE;
 152       }
 153
 154       // Check for particles heavier than (AliPID::kSPECIES - 1)
 155       if (dedx < (bethe + fRange*sigma)) heavy=kFALSE;
 156
 157     }
 158
 159     if (mismatch)
 160        for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1./AliPID::kSPECIES;
 161
 162     track->SetITSpid(p);
 163
 164     if (heavy) track->ResetStatus(AliESDtrack::kITSpid);
 165   }
 166   else {  // Likelihood method
 167     Double_t condprobfun[AliPID::kSPECIES];
 168     Double_t qclu[4];
 169     track->GetITSdEdxSamples(qclu);
 170     fITSResponse.GetITSProbabilities(mom,qclu,condprobfun);
 171     track->SetITSpid(condprobfun);
 172   }
 173
 174 }
 175 //_________________________________________________________________________
 176 void AliESDpid::MakeTOFPID(AliESDtrack *track, Float_t /*timeZeroTOF*/) const
 177 {
 178   //
 179   //   TOF PID using gaussian response
 180   //
 181
 182   if ((track->GetStatus()&AliESDtrack::kTOFout)==0) return;
 183   if ((track->GetStatus()&AliESDtrack::kTIME)==0) return;
 184   if ((track->GetStatus()&AliESDtrack::kITSin)==0) return;
 185
 186   Int_t ibin = fTOFResponse.GetMomBin(track->GetP());
 187   Float_t timezero = fTOFResponse.GetT0bin(ibin);
 188
 189   Double_t time[AliPID::kSPECIESN];
 190   track->GetIntegratedTimes(time);
 191
 192   Double_t sigma[AliPID::kSPECIES];
 193   for (Int_t iPart = 0; iPart < AliPID::kSPECIES; iPart++) {
 194     sigma[iPart] = fTOFResponse.GetExpectedSigma(track->GetP(),time[iPart],AliPID::ParticleMass(iPart));
 195   }
 196
 197   AliDebugGeneral("AliESDpid::MakeTOFPID",2,
 198            Form("Expected TOF signals [ps]: %f %f %f %f %f",
 199                   time[AliPID::kElectron],
 200                   time[AliPID::kMuon],
 201                   time[AliPID::kPion],
 202                   time[AliPID::kKaon],
 203                   time[AliPID::kProton]));
 204
 205   AliDebugGeneral("AliESDpid::MakeTOFPID",2,
 206            Form("Expected TOF std deviations [ps]: %f %f %f %f %f",
 207                   sigma[AliPID::kElectron],
 208                   sigma[AliPID::kMuon],
 209                   sigma[AliPID::kPion],
 210                   sigma[AliPID::kKaon],
 211                   sigma[AliPID::kProton]
 212                   ));
 213
 214   Double_t tof = track->GetTOFsignal() - timezero;
 215
 216   Double_t p[AliPID::kSPECIES];
 217   Bool_t mismatch = kTRUE, heavy = kTRUE;
 218   for (Int_t j=0; j<AliPID::kSPECIES; j++) {
 219     Double_t sig = sigma[j];
 220     if (TMath::Abs(tof-time[j]) > (fRange+2)*sig) {
 221         p[j] = TMath::Exp(-0.5*(fRange+2)*(fRange+2))/sig;
 222     } else
 223       p[j] = TMath::Exp(-0.5*(tof-time[j])*(tof-time[j])/(sig*sig))/sig;
 224
 225     // Check the mismatching
 226     Double_t mass = AliPID::ParticleMass(j);
 227     Double_t pm = fTOFResponse.GetMismatchProbability(track->GetP(),mass);
 228     if (p[j]>pm) mismatch = kFALSE;
 229
 230     // Check for particles heavier than (AliPID::kSPECIES - 1)
 231     if (tof < (time[j] + fRange*sig)) heavy=kFALSE;
 232
 233   }
 234
 235   if (mismatch)
 236     for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1./AliPID::kSPECIES;
 237
 238   track->SetTOFpid(p);
 239
 240   if (heavy) track->ResetStatus(AliESDtrack::kTOFpid);
 241   if (!CheckTOFMatching(track)) track->SetStatus(AliESDtrack::kTOFmismatch);
 242
 243 }
 244 //_________________________________________________________________________
 245 void AliESDpid::MakeTRDPID(AliESDtrack *track) const
 246 {
 247   //
 248   // Method to recalculate the TRD PID probabilities
 249   //
 250   Double_t prob[AliPID::kSPECIES];
 251   ComputeTRDProbability(track, AliPID::kSPECIES, prob);
 252   track->SetTRDpid(prob);
 253 }
 254 //_________________________________________________________________________
 255 void AliESDpid::CombinePID(AliESDtrack *track) const
 256 {
 257   //
 258   // Combine the information of various detectors
 259   // to determine the Particle Identification
 260   //
 261   Int_t ns=AliPID::kSPECIES;
 262   Double_t p[10]={1.,1.,1.,1.,1.,1.,1.,1.,1.,1.};
 263
 264   if (track->IsOn(AliESDtrack::kITSpid)) {
 265     Double_t d[10];
 266     track->GetITSpid(d);
 267     for (Int_t j=0; j<ns; j++) p[j]*=d[j];
 268   }
 269
 270   if (track->IsOn(AliESDtrack::kTPCpid)) {
 271     Double_t d[10];
 272     track->GetTPCpid(d);
 273     for (Int_t j=0; j<ns; j++) p[j]*=d[j];
 274   }
 275
 276   if (track->IsOn(AliESDtrack::kTRDpid)) {
 277     Double_t d[10];
 278     track->GetTRDpid(d);
 279     for (Int_t j=0; j<ns; j++) p[j]*=d[j];
 280   }
 281
 282   if (track->IsOn(AliESDtrack::kTOFpid)) {
 283     Double_t d[10];
 284     track->GetTOFpid(d);
 285     for (Int_t j=0; j<ns; j++) p[j]*=d[j];
 286   }
 287
 288   if (track->IsOn(AliESDtrack::kHMPIDpid)) {
 289     Double_t d[10];
 290     track->GetHMPIDpid(d);
 291     for (Int_t j=0; j<ns; j++) p[j]*=d[j];
 292   }
 293
 294   track->SetESDpid(p);
 295 }
 296 //_________________________________________________________________________
 297 Bool_t AliESDpid::CheckTOFMatching(AliESDtrack *track) const{
 298   //
 299   // Check pid matching of TOF with TPC as reference
 300   //
 301     Bool_t status = kFALSE;
 302
 303     Double_t exptimes[5];
 304     track->GetIntegratedTimes(exptimes);
 305
 306     Float_t p = track->P();
 307
 308     Float_t dedx = track->GetTPCsignal();
 309     Float_t time = track->GetTOFsignal() - fTOFResponse.GetStartTime(p);
 310
 311     Double_t ptpc[3];
 312     track->GetInnerPxPyPz(ptpc);
 313     Float_t momtpc=TMath::Sqrt(ptpc[0]*ptpc[0] + ptpc[1]*ptpc[1] + ptpc[2]*ptpc[2]);
 314
 315     for(Int_t i=0;i < 5;i++){
 316         AliPID::EParticleType type=AliPID::EParticleType(i);
 317
 318         Float_t resolutionTOF = fTOFResponse.GetExpectedSigma(p, exptimes[i], AliPID::ParticleMass(i));
 319         if(TMath::Abs(exptimes[i] - time) < fRange * resolutionTOF){
 320             Float_t dedxExp = fTPCResponse.GetExpectedSignal(momtpc,type);
 321             Float_t resolutionTPC = fTPCResponse.GetExpectedSigma(momtpc,track->GetTPCsignalN(),type);
 322
 323             if(TMath::Abs(dedx - dedxExp) < fRangeTOFMismatch * resolutionTPC){
 324                 status = kTRUE;
 325             }
 326         }
 327     }
 328
 329     // for nuclei
 330     Float_t resolutionTOFpr = fTOFResponse.GetExpectedSigma(p, exptimes[4], AliPID::ParticleMass(4));
 331     if(!status && (exptimes[4] + fRange*resolutionTOFpr < time)) status = kTRUE;
 332
 333
 334     return status;
 335 }
 336 //_________________________________________________________________________
 337 void AliESDpid::SetTOFResponse(AliVEvent *vevent,EStartTimeType_t option){
 338   //
 339   // Set TOF response function
 340   // Input option for event_time used
 341   //
 342
 343     AliESDEvent *event=(AliESDEvent*)vevent;
 344
 345     Float_t t0spread = 0.; //event->GetEventTimeSpread();
 346     if(t0spread < 10) t0spread = 80;
 347
 348     // T0 from TOF algorithm
 349
 350     Bool_t flagT0TOF=kFALSE;
 351     Bool_t flagT0T0=kFALSE;
 352     Float_t *startTime = new Float_t[fTOFResponse.GetNmomBins()];
 353     Float_t *startTimeRes = new Float_t[fTOFResponse.GetNmomBins()];
 354     Int_t *startTimeMask = new Int_t[fTOFResponse.GetNmomBins()];
 355
 356     // T0-TOF arrays
 357     Float_t *estimatedT0event = new Float_t[fTOFResponse.GetNmomBins()];
 358     Float_t *estimatedT0resolution = new Float_t[fTOFResponse.GetNmomBins()];
 359     for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){
 360       estimatedT0event[i]=0.0;
 361       estimatedT0resolution[i]=0.0;
 362       startTimeMask[i] = 0;
 363     }
 364
 365     Float_t resT0A=75,resT0C=65,resT0AC=55;
 366     if(event->GetT0TOF()){ // check if T0 detector information is available
 367         flagT0T0=kTRUE;
 368     }
 369
 370
 371     AliTOFHeader *tofHeader =(AliTOFHeader*)event->GetTOFHeader();
 372
 373     if(tofHeader){ // read global info and T0-TOF info from ESD
 374       fTOFResponse.SetTimeResolution(tofHeader->GetTOFResolution());
 375       t0spread = tofHeader->GetT0spread(); // read t0 sprad
 376       if(t0spread < 10) t0spread = 80;
 377
 378       flagT0TOF=kTRUE;
 379       for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){ // read T0-TOF default value
 380         startTime[i]=tofHeader->GetDefaultEventTimeVal();
 381         startTimeRes[i]=tofHeader->GetDefaultEventTimeRes();
 382         if(startTimeRes[i] < 1.e-5) startTimeRes[i] = t0spread;
 383       }
 384
 385       TArrayI *ibin=tofHeader->GetNvalues();
 386       TArrayF *t0Bin=tofHeader->GetEventTimeValues();
 387       TArrayF *t0ResBin=tofHeader->GetEventTimeRes();
 388       for(Int_t j=0;j < tofHeader->GetNbins();j++){ // fill T0-TOF in p-bins
 389         Int_t icurrent = (Int_t)ibin->GetAt(j);
 390         startTime[icurrent]=t0Bin->GetAt(j);
 391         startTimeRes[icurrent]=t0ResBin->GetAt(j);
 392         if(startTimeRes[icurrent] < 1.e-5) startTimeRes[icurrent] = t0spread;
 393      }
 394     }
 395
 396     // for cut of 3 sigma on t0 spread
 397     Float_t t0cut = 3 * t0spread;
 398     if(t0cut < 500) t0cut = 500;
 399
 400     if(option == kFILL_T0){ // T0-FILL is used
 401         for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){
 402           estimatedT0event[i]=0.0;
 403           estimatedT0resolution[i]=t0spread;
 404         }
 405         fTOFResponse.SetT0event(estimatedT0event);
 406         fTOFResponse.SetT0resolution(estimatedT0resolution);
 407     }
 408
 409     if(option == kTOF_T0){ // T0-TOF is used when available (T0-FILL otherwise) from ESD
 410         if(flagT0TOF){
 411             fTOFResponse.SetT0event(startTime);
 412             fTOFResponse.SetT0resolution(startTimeRes);
 413             for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){
 414               if(startTimeRes[i]<t0spread) startTimeMask[i]=1;
 415               fTOFResponse.SetT0binMask(i,startTimeMask[i]);
 416             }
 417         }
 418         else{
 419             for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){
 420               estimatedT0event[i]=0.0;
 421               estimatedT0resolution[i]=t0spread;
 422               fTOFResponse.SetT0binMask(i,startTimeMask[i]);
 423             }
 424             fTOFResponse.SetT0event(estimatedT0event);
 425             fTOFResponse.SetT0resolution(estimatedT0resolution);
 426         }
 427     }
 428     else if(option == kBest_T0){ // T0-T0 or T0-TOF are used when available (T0-FILL otherwise) from ESD
 429         Float_t t0AC=-10000;
 430         Float_t t0A=-10000;
 431         Float_t t0C=-10000;
 432         if(flagT0T0){
 433             t0AC= event->GetT0TOF()[0];
 434             t0A= event->GetT0TOF()[1];
 435             t0C= event->GetT0TOF()[2];
 436         }
 437
 438         Float_t t0t0Best = 0;
 439         Float_t t0t0BestRes = 9999;
 440         Int_t t0used=0;
 441         if(TMath::Abs(t0A) < t0cut && TMath::Abs(t0C) < t0cut && TMath::Abs(t0C-t0A) < 500){
 442             t0t0Best = t0AC;
 443             t0t0BestRes = resT0AC;
 444             t0used=6;
 445         }
 446         else if(TMath::Abs(t0C) < t0cut){
 447             t0t0Best = t0C;
 448             t0t0BestRes = resT0C;
 449             t0used=4;
 450         }
 451         else if(TMath::Abs(t0A) < t0cut){
 452             t0t0Best = t0A;
 453             t0t0BestRes = resT0A;
 454             t0used=2;
 455         }
 456
 457         if(flagT0TOF){ // if T0-TOF info is available
 458             for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){
 459                 if(t0t0BestRes < 999){
 460                   if(startTimeRes[i] < t0spread){
 461                     Double_t wtot = 1./startTimeRes[i]/startTimeRes[i] + 1./t0t0BestRes/t0t0BestRes;
 462                     Double_t t0best = startTime[i]/startTimeRes[i]/startTimeRes[i] + t0t0Best/t0t0BestRes/t0t0BestRes;
 463                     estimatedT0event[i]=t0best / wtot;
 464                     estimatedT0resolution[i]=1./TMath::Sqrt(wtot);
 465                     startTimeMask[i] = t0used+1;
 466                   }
 467                   else {
 468                     estimatedT0event[i]=t0t0Best;
 469                     estimatedT0resolution[i]=t0t0BestRes;
 470                     startTimeMask[i] = t0used;
 471                   }
 472                 }
 473                 else{
 474                   estimatedT0event[i]=startTime[i];
 475                   estimatedT0resolution[i]=startTimeRes[i];
 476                   if(startTimeRes[i]<t0spread) startTimeMask[i]=1;
 477                 }
 478                 fTOFResponse.SetT0binMask(i,startTimeMask[i]);
 479             }
 480             fTOFResponse.SetT0event(estimatedT0event);
 481             fTOFResponse.SetT0resolution(estimatedT0resolution);
 482         }
 483         else{ // if no T0-TOF info is available
 484             for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){
 485               fTOFResponse.SetT0binMask(i,t0used);
 486               if(t0t0BestRes < 999){
 487                 estimatedT0event[i]=t0t0Best;
 488                 estimatedT0resolution[i]=t0t0BestRes;
 489               }
 490               else{
 491                 estimatedT0event[i]=0.0;
 492                 estimatedT0resolution[i]=t0spread;
 493               }
 494             }
 495             fTOFResponse.SetT0event(estimatedT0event);
 496             fTOFResponse.SetT0resolution(estimatedT0resolution);
 497         }
 498     }
 499
 500     else if(option == kT0_T0){ // T0-T0 is used when available (T0-FILL otherwise) from ESD
 501         Float_t t0AC=-10000;
 502         Float_t t0A=-10000;
 503         Float_t t0C=-10000;
 504         if(flagT0T0){
 505             t0AC= event->GetT0TOF()[0];
 506             t0A= event->GetT0TOF()[1];
 507             t0C= event->GetT0TOF()[2];
 508         }
 509
 510         if(TMath::Abs(t0A) < t0cut && TMath::Abs(t0C) < t0cut && TMath::Abs(t0C-t0A) < 500){
 511             for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){
 512               estimatedT0event[i]=t0AC;
 513               estimatedT0resolution[i]=resT0AC;
 514               fTOFResponse.SetT0binMask(i,6);
 515             }
 516         }
 517         else if(TMath::Abs(t0C) < t0cut){
 518             for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){
 519               estimatedT0event[i]=t0C;
 520               estimatedT0resolution[i]=resT0C;
 521               fTOFResponse.SetT0binMask(i,4);
 522             }
 523         }
 524         else if(TMath::Abs(t0A) < t0cut){
 525             for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){
 526               estimatedT0event[i]=t0A;
 527               estimatedT0resolution[i]=resT0A;
 528               fTOFResponse.SetT0binMask(i,2);
 529             }
 530         }
 531         else{
 532             for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){
 533               estimatedT0event[i]=0.0;
 534               estimatedT0resolution[i]=t0spread;
 535               fTOFResponse.SetT0binMask(i,0);
 536             }
 537         }
 538         fTOFResponse.SetT0event(estimatedT0event);
 539         fTOFResponse.SetT0resolution(estimatedT0resolution);
 540     }
 541     delete [] startTime;
 542     delete [] startTimeRes;
 543     delete [] startTimeMask;
 544     delete [] estimatedT0event;
 545     delete [] estimatedT0resolution;
 546 }