PWG1/TRD/AliTRDpidRefMaker.cxx

   1 #include "TPDGCode.h"
   2 #include "TFile.h"
   3 #include "TTree.h"
   4 #include "TEventList.h"
   5 #include "TObjArray.h"
   6 #include "TH2.h"
   7
   8 #include "AliLog.h"
   9 #include "AliESDtrack.h"
  10 #include "AliTrackReference.h"
  11
  12 #include "AliTRDReconstructor.h"
  13 #include "AliTRDtrackV1.h"
  14 #include "AliTRDseedV1.h"
  15 #include "AliTRDpidRefMaker.h"
  16 #include "info/AliTRDv0Info.h"
  17
  18
  19 // Defines and implements basic functionality for building reference data for TRD PID.
  20 //
  21 // Here is the list of functionality provided by this class
  22 // 1.
  23 // 2.
  24 //
  25 // Authors:
  26 //   Alex Bercuci <A.Bercuci@gsi.de>
  27 //   Alex Wilk    <wilka@uni-muenster.de>
  28 //   Markus Fasel <mfasel@gsi.de>
  29 //   Markus Heide <mheide@uni-muenster.de>
  30 //
  31
  32 ClassImp(AliTRDpidRefMaker)
  33 ClassImp(AliTRDpidRefMaker::AliTRDpidRefData)
  34 ClassImp(AliTRDpidRefMaker::AliTRDpidRefDataArray)
  35
  36 //________________________________________________________________________
  37 AliTRDpidRefMaker::AliTRDpidRefDataArray::AliTRDpidRefDataArray() :
  38   fNtracklets(0)
  39   ,fData(0x0)
  40 {
  41   // Constructor of data array
  42   fData = new AliTRDpidRefData[AliTRDgeometry::kNlayer];
  43 }
  44
  45 //________________________________________________________________________
  46 AliTRDpidRefMaker::AliTRDpidRefDataArray::~AliTRDpidRefDataArray()
  47 {
  48   // Destructor
  49   delete [] fData;
  50 }
  51
  52 //________________________________________________________________________
  53 void AliTRDpidRefMaker::AliTRDpidRefDataArray::PushBack(Int_t ly, Int_t p, Float_t *dedx)
  54 {
  55 // Add PID data to the end of the array
  56   fData[fNtracklets].fPLbin= (ly<<4) | (p&0xf);
  57   memcpy(fData[fNtracklets].fdEdx, dedx, 8*sizeof(Float_t));
  58   fNtracklets++;
  59 }
  60
  61 //________________________________________________________________________
  62 void AliTRDpidRefMaker::AliTRDpidRefDataArray::Reset()
  63 {
  64 // Reset content
  65
  66   if(!fNtracklets) return;
  67   while(fNtracklets--){
  68     fData[fNtracklets].fPLbin = 0xff;
  69     memset(fData[fNtracklets].fdEdx, 0, 8*sizeof(Float_t));
  70   }
  71   fNtracklets=0;
  72 }
  73
  74 //________________________________________________________________________
  75 AliTRDpidRefMaker::AliTRDpidRefMaker(const char *name, const char *title)
  76   :AliTRDrecoTask(name, title)
  77   ,fReconstructor(0x0)
  78   ,fV0s(0x0)
  79   ,fData(0x0)
  80   ,fPIDdataArray(0x0)
  81   ,fRefPID(kMC)
  82   ,fRefP(kMC)
  83   ,fPIDbin(0xff)
  84   ,fFreq(1.)
  85   ,fP(-1.)
  86   ,fPthreshold(0.5)
  87 {
  88   //
  89   // Default constructor
  90   //
  91
  92   fReconstructor = new AliTRDReconstructor();
  93   fReconstructor->SetRecoParam(AliTRDrecoParam::GetLowFluxParam());
  94   memset(fdEdx, 0, 10*sizeof(Float_t));
  95   memset(fPID, 0, AliPID::kSPECIES*sizeof(Float_t));
  96
  97   DefineInput(1, TObjArray::Class());
  98   DefineOutput(1, TTree::Class());
  99 }
 100
 101
 102 //________________________________________________________________________
 103 AliTRDpidRefMaker::~AliTRDpidRefMaker()
 104 {
 105   if(fPIDdataArray) delete fPIDdataArray;
 106   if(fReconstructor) delete fReconstructor;
 107 }
 108
 109 //________________________________________________________________________
 110 Bool_t AliTRDpidRefMaker::CheckQuality(AliTRDseedV1* /*trklt*/)
 111 {
 112 // Place holder for checking tracklet quality for PID.
 113   return kTRUE;
 114 }
 115
 116
 117 //________________________________________________________________________
 118 Float_t* AliTRDpidRefMaker::CookdEdx(AliTRDseedV1 *trklt)
 119 {
 120   trklt->CookdEdx(AliTRDpidUtil::kNNslices);
 121   memcpy(fdEdx, trklt->GetdEdx(), AliTRDpidUtil::kNNslices*sizeof(Float_t));
 122   return fdEdx;
 123 }
 124
 125
 126 //________________________________________________________________________
 127 void AliTRDpidRefMaker::ConnectInputData(Option_t *opt)
 128 {
 129   AliTRDrecoTask::ConnectInputData(opt);
 130   fV0s = dynamic_cast<TObjArray*>(GetInputData(1));
 131 }
 132
 133 //________________________________________________________________________
 134 void AliTRDpidRefMaker::CreateOutputObjects()
 135 {
 136   // Create histograms
 137   // Called once
 138
 139   OpenFile(0, "RECREATE");
 140   fContainer = new TObjArray();
 141   fContainer->SetName(Form("Moni%s", GetName()));
 142
 143   TH2 *h2 = new TH2I("hPDG","Particle abundance", AliPID::kSPECIES, -0.5, 4.5, AliTRDCalPID::kNMom, -0.5, AliTRDCalPID::kNMom-0.5);
 144   TAxis *ax = h2->GetXaxis();
 145   ax->SetNdivisions(505);
 146   ax->SetTitle("Particle species");
 147   for(Int_t is=AliPID::kSPECIES; is--;) ax->SetBinLabel(is+1, AliPID::ParticleShortName(is));
 148   h2->GetYaxis()->SetTitle("P bins");
 149   h2->GetYaxis()->SetNdivisions(511);
 150
 151   fContainer->AddAt(h2, 0);
 152
 153   fData = new TTree(GetName(), Form("Reference data for %s", GetName()));
 154   fData->Branch("s", &fPIDbin, "s/b");
 155   fData->Branch("data", &fPIDdataArray);
 156 }
 157
 158 //________________________________________________________________________
 159 void AliTRDpidRefMaker::Exec(Option_t *)
 160 {
 161   // Main loop
 162   // Called for each event
 163
 164   AliTRDtrackInfo     *track = 0x0;
 165   AliTRDtrackV1    *trackTRD = 0x0;
 166   AliTrackReference     *ref = 0x0;
 167   const AliTRDtrackInfo::AliESDinfo *infoESD = 0x0;
 168   for(Int_t itrk=0; itrk<fTracks->GetEntriesFast(); itrk++){
 169     track = (AliTRDtrackInfo*)fTracks->UncheckedAt(itrk);
 170     if(!track->HasESDtrack()) continue;
 171     trackTRD = track->GetTrack();
 172     infoESD  = track->GetESDinfo();
 173     Double32_t *infoPID = infoESD->GetSliceIter();
 174     Int_t n = infoESD->GetNSlices() - AliTRDgeometry::kNlayer;
 175     Double32_t *p = &infoPID[n];
 176
 177
 178     ULong_t status = track->GetStatus();
 179     if(!(status&AliESDtrack::kTPCout)) continue;
 180
 181     // fill the pid information
 182     SetRefPID(fRefPID, track, fPID);
 183
 184     // prepare PID data array
 185     if(!fPIDdataArray){
 186       fPIDdataArray = new AliTRDpidRefDataArray();
 187     } else fPIDdataArray->Reset();
 188
 189     // fill PID information
 190     for(Int_t ily = 0; ily < AliTRDgeometry::kNlayer; ily++){
 191
 192       // fill P & dE/dx information
 193       if(HasFriends()){ // from TRD track
 194         if(!trackTRD) continue;
 195         AliTRDseedV1 *trackletTRD(0x0);
 196         trackTRD -> SetReconstructor(fReconstructor);
 197         if(!(trackletTRD = trackTRD -> GetTracklet(ily))) continue;
 198         if(!CheckQuality(trackletTRD)) continue;
 199         if(!CookdEdx(trackletTRD)) continue;
 200
 201         // fill momentum information
 202         fP = 0.;
 203         switch(fRefP){
 204         case kMC:
 205           if(!(ref = track->GetTrackRef(trackletTRD))) continue;
 206           fP = ref->P();
 207           break;
 208         case kRec:
 209           fP = trackletTRD->GetMomentum();
 210           break;
 211         default: continue;
 212         }
 213       } else { // from ESD track
 214         // fill momentum information
 215         switch(fRefP){
 216         case kMC:
 217           if(!(ref = track->GetTrackRef(ily))) continue;
 218           fP = ref->P();
 219           break;
 220         case kRec:
 221           fP = p[ily];
 222           break;
 223         default: continue;
 224         }
 225         Double32_t *it = &infoPID[ily*AliTRDCalPID::kNSlicesNN];
 226         for(Int_t is=AliTRDCalPID::kNSlicesNN; is--; it++) fdEdx[is] = (*it);
 227       }
 228
 229       // momentum threshold
 230       if(fP < fPthreshold) continue;
 231
 232       // store information
 233       fPIDdataArray->PushBack(ily, AliTRDpidUtil::GetMomentumBin(fP), fdEdx);
 234     }
 235
 236     Fill();
 237   }
 238
 239   PostData(0, fContainer);
 240   PostData(1, fData);
 241 }
 242
 243
 244 //________________________________________________________________________
 245 void AliTRDpidRefMaker::Fill()
 246 {
 247 // Fill data tree
 248
 249   if(!fPIDdataArray->fNtracklets) return;
 250   fPIDbin = TMath::LocMax(AliPID::kSPECIES, fPID); // get particle type
 251 // Fill data tree
 252   fData->Fill();
 253
 254
 255   // fill monitor
 256   for(Int_t ily=fPIDdataArray->fNtracklets; ily--;){
 257     Int_t pBin = fPIDdataArray->fData[ily].fPLbin & 0xf;
 258     ((TH2*)fContainer->At(0))->Fill(fPIDbin, pBin);
 259   }
 260 }
 261
 262 //________________________________________________________________________
 263 void AliTRDpidRefMaker::LinkPIDdata()
 264 {
 265 // Link data tree to data members
 266   fData->SetBranchAddress("s", &fPIDbin);
 267   fData->SetBranchAddress("data", &fPIDdataArray);
 268 }
 269
 270 //________________________________________________________________________
 271 void AliTRDpidRefMaker::SetRefPID(ETRDpidRefMakerSource select, void *source, Float_t *pid)
 272 {
 273 // Fill the reference PID values "pid" from "source" object
 274 // according to the option "select". Possible options are
 275 // - kV0  - v0 based PID
 276 // - kMC  - MC truth [default]
 277 // - kRec - outside detectors
 278
 279
 280   memset(fPID, 0, AliPID::kSPECIES*sizeof(Float_t));
 281   switch(select){
 282   case kV0:
 283     {
 284       AliTRDtrackInfo *track = static_cast<AliTRDtrackInfo*>(source);
 285       if(!track){
 286         AliError("No trackInfo found");
 287         return;
 288       }
 289
 290       //Get V0 PID decisions from the AliTRDv0Info for all particle species (implemented so far : electrons from conversions, pions from K0s and protons from Lambdas) :
 291       AliTRDv0Info v0;
 292       for(Int_t is=AliPID::kSPECIES; is--;) fPID[is] = v0.GetV0PID(is, track);
 293     }
 294     break;
 295   case kMC:
 296     if(!HasMCdata()){
 297       AliError("Could not retrive reference PID from MC");
 298       return;
 299     }
 300     {
 301       AliTRDtrackInfo *track = static_cast<AliTRDtrackInfo*>(source);
 302       switch(track->GetPDG()){
 303       case kElectron:
 304       case kPositron:
 305         fPID[AliPID::kElectron] = 1.;
 306         break;
 307       case kMuonPlus:
 308       case kMuonMinus:
 309         fPID[AliPID::kMuon] = 1.;
 310         break;
 311       case kPiPlus:
 312       case kPiMinus:
 313         fPID[AliPID::kPion] = 1.;
 314         break;
 315       case kKPlus:
 316       case kKMinus:
 317         fPID[AliPID::kKaon] = 1.;
 318         break;
 319       case kProton:
 320       case kProtonBar:
 321         fPID[AliPID::kProton] = 1.;
 322         break;
 323       }
 324     }
 325     break;
 326   case kRec:
 327     {
 328       AliTRDtrackInfo *track = static_cast<AliTRDtrackInfo*>(source);
 329       AliTRDtrackV1 *trackTRD = track->GetTrack();
 330       trackTRD -> SetReconstructor(fReconstructor);
 331       //fReconstructor -> SetOption("nn");
 332       trackTRD -> CookPID();
 333       for(Int_t iPart = 0; iPart < AliPID::kSPECIES; iPart++){
 334         pid[iPart] = trackTRD -> GetPID(iPart);
 335         AliDebug(4, Form("PDG is (in V0info) %d %f", iPart, pid[iPart]));
 336       }
 337     }
 338     break;
 339   default:
 340     AliWarning("PID reference source not implemented");
 341     return;
 342   }
 343   AliDebug(4, Form("Ref PID [%] : %s[%5.2f] %s[%5.2f] %s[%5.2f] %s[%5.2f] %s[%5.2f]"
 344     ,AliPID::ParticleShortName(0), 1.e2*fPID[0]
 345     ,AliPID::ParticleShortName(1), 1.e2*fPID[1]
 346     ,AliPID::ParticleShortName(2), 1.e2*fPID[2]
 347     ,AliPID::ParticleShortName(3), 1.e2*fPID[3]
 348     ,AliPID::ParticleShortName(4), 1.e2*fPID[4]
 349   ));
 350 }
 351
 352 //________________________________________________________________________
 353 void AliTRDpidRefMaker::SetAbundance(Float_t train)
 354 {
 355 // Split data sample between trainning and testing
 356
 357   if(train<0. || train >1.){
 358     AliWarning("The input data should be in the interval [0, 1]");
 359     return;
 360   }
 361
 362   fFreq = train;
 363 }
 364