PWG4/PartCorrBase/AliCaloPID.cxx

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  15 /* $Id: AliCaloPID.cxx 21839 2007-10-29 13:49:42Z gustavo $ */
  16
  17 //_________________________________________________________________________
  18 // Class for track/cluster acceptance selection
  19 // Selection in Central barrel, EMCAL and PHOS
  20 //
  21 //*-- Author: Gustavo Conesa (LNF-INFN)
  22 //////////////////////////////////////////////////////////////////////////////
  23
  24
  25 // --- ROOT system ---
  26 #include <TMath.h>
  27 #include <TLorentzVector.h>
  28 #include <TString.h>
  29 #include <TFormula.h>
  30
  31 //---- ANALYSIS system ----
  32 #include "AliLog.h"
  33 #include "AliCaloPID.h"
  34 #include "AliAODCaloCluster.h"
  35 #include "AliAODPWG4Particle.h"
  36 #include "AliStack.h"
  37 #include "TParticle.h"
  38
  39 ClassImp(AliCaloPID)
  40
  41
  42 //________________________________________________
  43 AliCaloPID::AliCaloPID() :
  44 TObject(), fEMCALPhotonWeight(0.), fEMCALPi0Weight(0.),
  45 fEMCALElectronWeight(0.),  fEMCALChargeWeight(0.),
  46 fEMCALNeutralWeight(0.),
  47 fPHOSPhotonWeight(0.), fPHOSPi0Weight(0.),
  48 fPHOSElectronWeight(0.), fPHOSChargeWeight(0.) ,
  49 fPHOSNeutralWeight(0.), fPHOSWeightFormula(0),
  50 fPHOSPhotonWeightFormula(0x0), fPHOSPi0WeightFormula(0x0),
  51 fDispCut(0.),fTOFCut(0.), fDebug(-1)
  52 {
  53         //Ctor
  54
  55         //Initialize parameters
  56         InitParameters();
  57 }
  58
  59 //____________________________________________________________________________
  60 AliCaloPID::AliCaloPID(const AliCaloPID & pid) :
  61 TObject(pid), fEMCALPhotonWeight(pid.fEMCALPhotonWeight),
  62 fEMCALPi0Weight(pid.fEMCALPi0Weight),
  63 fEMCALElectronWeight(pid.fEMCALElectronWeight),
  64 fEMCALChargeWeight(pid.fEMCALChargeWeight),
  65 fEMCALNeutralWeight(pid.fEMCALNeutralWeight),
  66 fPHOSPhotonWeight(pid.fPHOSPhotonWeight),
  67 fPHOSPi0Weight(pid.fPHOSPi0Weight),
  68 fPHOSElectronWeight(pid.fPHOSElectronWeight),
  69 fPHOSChargeWeight(pid.fPHOSChargeWeight),
  70 fPHOSNeutralWeight(pid.fPHOSNeutralWeight),
  71 fPHOSWeightFormula(pid.fPHOSWeightFormula),
  72 fPHOSPhotonWeightFormula(pid.fPHOSPhotonWeightFormula),
  73 fPHOSPi0WeightFormula(pid.fPHOSPi0WeightFormula),
  74 fDispCut(pid.fDispCut),fTOFCut(pid.fTOFCut),
  75 fDebug(pid.fDebug)
  76 {
  77         // cpy ctor
  78
  79 }
  80
  81 //_________________________________________________________________________
  82 AliCaloPID & AliCaloPID::operator = (const AliCaloPID & pid)
  83 {
  84         // assignment operator
  85
  86         if(&pid == this) return *this;
  87
  88         fEMCALPhotonWeight = pid. fEMCALPhotonWeight ;
  89         fEMCALPi0Weight = pid.fEMCALPi0Weight ;
  90         fEMCALElectronWeight = pid.fEMCALElectronWeight;
  91         fEMCALChargeWeight = pid.fEMCALChargeWeight;
  92         fEMCALNeutralWeight = pid.fEMCALNeutralWeight;
  93
  94         fPHOSPhotonWeight = pid.fPHOSPhotonWeight ;
  95         fPHOSPi0Weight = pid.fPHOSPi0Weight ;
  96         fPHOSElectronWeight = pid.fPHOSElectronWeight;
  97         fPHOSChargeWeight = pid.fPHOSChargeWeight;
  98         fPHOSNeutralWeight = pid.fPHOSNeutralWeight;
  99
 100         fPHOSWeightFormula       = pid.fPHOSWeightFormula;
 101         fPHOSPhotonWeightFormula = pid.fPHOSPhotonWeightFormula;
 102         fPHOSPi0WeightFormula    = pid.fPHOSPi0WeightFormula;
 103
 104         fDispCut  = pid.fDispCut;
 105         fTOFCut   = pid.fTOFCut;
 106         fDebug    = pid.fDebug;
 107
 108         return *this;
 109
 110 }
 111
 112 //_________________________________
 113 AliCaloPID::~AliCaloPID() {
 114         //Dtor
 115
 116         if(fPHOSPhotonWeightFormula) delete  fPHOSPhotonWeightFormula ;
 117         if(fPHOSPi0WeightFormula) delete  fPHOSPi0WeightFormula ;
 118
 119 }
 120
 121
 122 //_________________________________________________________________________
 123 Int_t AliCaloPID::CheckOrigin(const Int_t label, AliStack * stack) const {
 124         //Play with the MC stack if available
 125         //Check origin of the candidates, good for PYTHIA
 126
 127         if(!stack) AliFatal("Stack is not available, check analysis settings in configuration file, STOP!!");
 128
 129         if(label >= 0 && label <  stack->GetNtrack()){
 130                 //Mother
 131                 TParticle * mom = stack->Particle(label);
 132                 Int_t mPdg = TMath::Abs(mom->GetPdgCode());
 133                 Int_t mStatus =  mom->GetStatusCode() ;
 134                 Int_t iParent =  mom->GetFirstMother() ;
 135                 if(fDebug > 0 && label < 8 ) printf("AliCaloPID::CheckOrigin: Mother is parton %d\n",iParent);
 136
 137                 //GrandParent
 138                 TParticle * parent = new TParticle ;
 139                 Int_t pPdg = -1;
 140                 Int_t pStatus =-1;
 141                 if(iParent > 0){
 142                         parent = stack->Particle(iParent);
 143                         pPdg = TMath::Abs(parent->GetPdgCode());
 144                         pStatus = parent->GetStatusCode();
 145                 }
 146                 else if(fDebug > 0 ) printf("AliCaloPID::CheckOrigin: Parent with label %d\n",iParent);
 147
 148                 //return tag
 149                 if(mPdg == 22){
 150                         if(mStatus == 1){
 151                                 if(iParent < 8) {
 152                                         if(pPdg == 22) return kMCPrompt;
 153                                         else  return kMCFragmentation;
 154                                 }
 155                                 else if(pStatus == 11){
 156                                         if(pPdg == 111) return kMCPi0Decay ;
 157                                         else if (pPdg == 321)  return kMCEtaDecay ;
 158                                         else  return kMCOtherDecay ;
 159                                 }
 160                         }//Status 1 : Pythia generated
 161                         else if(mStatus == 0){
 162                                 if(pPdg ==22 || pPdg ==11) return kMCConversion ;
 163                                 if(pPdg == 111) return kMCPi0Decay ;
 164                                 else if (pPdg == 221)  return kMCEtaDecay ;
 165                                 else  return kMCOtherDecay ;
 166                         }//status 0 : geant generated
 167                 }//Mother Photon
 168                 else if(mPdg == 111)  return kMCPi0 ;
 169                 else if(mPdg == 221)  return kMCEta ;
 170                 else if(mPdg ==11){
 171                         if(mStatus == 0) return kMCConversion ;
 172                         else return kMCElectron ;
 173                 }
 174                 else return kMCUnknown;
 175         }//Good label value
 176         else{
 177                 if(label < 0 ) printf("AliCaloPID::CheckOrigin: *** bad label or no stack ***:  label %d \n", label);
 178                 if(label >=  stack->GetNtrack()) printf("AliCaloPID::CheckOrigin: *** large label ***:  label %d, n tracks %d \n", label, stack->GetNtrack());
 179                 return kMCUnknown;
 180         }//Bad label
 181
 182         return kMCUnknown;
 183
 184 }
 185
 186 //_______________________________________________________________
 187 void AliCaloPID::InitParameters()
 188 {
 189         //Initialize the parameters of the PID.
 190
 191         fEMCALPhotonWeight   = 0.8 ;
 192         fEMCALPi0Weight      = 0.5 ;
 193         fEMCALElectronWeight = 0.8 ;
 194         fEMCALChargeWeight   = 0.5 ;
 195         fEMCALNeutralWeight  = 0.5 ;
 196
 197         fPHOSPhotonWeight    = 0.75 ;
 198         fPHOSPi0Weight       = 0.8 ;
 199         fPHOSElectronWeight  = 0.5 ;
 200         fPHOSChargeWeight    = 0.5 ;
 201         fPHOSNeutralWeight   = 0.5 ;
 202
 203         //Formula to set the PID weight threshold for photon or pi0
 204         fPHOSWeightFormula = kTRUE;
 205         fPHOSPhotonWeightFormula =
 206     new TFormula("photonWeight","0.98*(x<40)+ 0.68*(x>=100)+(x>=40 && x<100)*(0.98+x*(6e-3)-x*x*(2e-04)+x*x*x*(1.1e-06))");
 207         fPHOSPi0WeightFormula =
 208     new TFormula("pi0Weight","0.98*(x<65)+ 0.915*(x>=100)+(x>=65 && x-x*(1.95e-3)-x*x*(4.31e-05)+x*x*x*(3.61e-07))");
 209
 210     fDispCut  = 1.5;
 211         fTOFCut   = 5.e-9;
 212         fDebug = -1;
 213 }
 214
 215 //_______________________________________________________________
 216 Int_t AliCaloPID::GetPdg(const TString calo, const Double_t * pid, const Float_t energy) const {
 217         //Return most probable identity of the particle.
 218
 219         if(!pid) AliFatal("pid pointer not initialized!!!");
 220
 221         Float_t wPh =  fPHOSPhotonWeight ;
 222         Float_t wPi0 =  fPHOSPi0Weight ;
 223         Float_t wE =  fPHOSElectronWeight ;
 224         Float_t wCh =  fPHOSChargeWeight ;
 225         Float_t wNe =  fPHOSNeutralWeight ;
 226
 227
 228         if(calo == "PHOS" && fPHOSWeightFormula){
 229                 wPh  = fPHOSPhotonWeightFormula->Eval(energy) ;
 230                 wPi0 = fPHOSPi0WeightFormula->Eval(energy);
 231         }
 232
 233         if(calo == "EMCAL"){
 234
 235                 wPh  =  fEMCALPhotonWeight ;
 236                 wPi0 =  fEMCALPi0Weight ;
 237                 wE   =  fEMCALElectronWeight ;
 238                 wCh  =  fEMCALChargeWeight ;
 239                 wNe  =  fEMCALNeutralWeight ;
 240
 241         }
 242
 243         if(fDebug > 0)  printf("AliCaloPID::GetPdg: calo %s, ph %0.2f, pi0 %0.2f, el %0.2f, conv el %0.2f, hadrons: pion %0.2f, kaon %0.2f, proton %0.2f , neutron %0.2f, kaon %0.2f \n",
 244                                                    calo.Data(),pid[AliAODCluster::kPhoton], pid[AliAODCluster::kPi0],
 245                                                    pid[AliAODCluster::kElectron], pid[AliAODCluster::kEleCon],
 246                                                    pid[AliAODCluster::kPion], pid[AliAODCluster::kKaon], pid[AliAODCluster::kProton],
 247                                                    pid[AliAODCluster::kNeutron], pid[AliAODCluster::kKaon0]);
 248
 249         Int_t pdg = kNeutralUnknown ;
 250         Float_t chargedHadronWeight = pid[AliAODCluster::kProton]+pid[AliAODCluster::kKaon]+
 251     pid[AliAODCluster::kPion]+pid[AliAODCluster::kMuon];
 252         Float_t neutralHadronWeight = pid[AliAODCluster::kNeutron]+pid[AliAODCluster::kKaon0];
 253         Float_t allChargedWeight    = pid[AliAODCluster::kElectron]+pid[AliAODCluster::kEleCon]+ chargedHadronWeight;
 254         Float_t allNeutralWeight    = pid[AliAODCluster::kPhoton]+pid[AliAODCluster::kPi0]+ neutralHadronWeight;
 255
 256         //Select most probable ID
 257         if(calo=="PHOS"){
 258                 if(pid[AliAODCluster::kPhoton] > wPh) pdg = kPhoton ;
 259                 else if(pid[AliAODCluster::kPi0] > wPi0) pdg = kPi0 ;
 260                 else if(pid[AliAODCluster::kElectron] > wE)  pdg = kElectron ;
 261                 else if(pid[AliAODCluster::kEleCon] >  wE) pdg = kEleCon ;
 262                 else if(chargedHadronWeight > wCh) pdg = kChargedHadron ;
 263                 else if(neutralHadronWeight > wNe) pdg = kNeutralHadron ;
 264                 else if(allChargedWeight >  allNeutralWeight)
 265                         pdg = kChargedUnknown ;
 266                 else
 267                         pdg = kNeutralUnknown ;
 268         }
 269         else{//EMCAL
 270                 //Temporal solution, electrons and photons not differenciated
 271                 if(pid[AliAODCluster::kPhoton] + pid[AliAODCluster::kElectron]  > wPh) pdg = kPhoton ;
 272                 else if(pid[AliAODCluster::kPi0] > wPi0) pdg = kPi0 ;
 273                 else if(chargedHadronWeight + neutralHadronWeight > wCh) pdg = kChargedHadron ;
 274                 else if(neutralHadronWeight + chargedHadronWeight > wNe) pdg = kNeutralHadron ;
 275                 else pdg =  kNeutralUnknown ;
 276
 277         }
 278
 279
 280         if(fDebug > 0)printf("AliCaloPID::GetPdg:Final Pdg: %d \n", pdg);
 281
 282
 283
 284         return pdg ;
 285
 286 }
 287
 288 //_______________________________________________________________
 289 Int_t AliCaloPID::GetPdg(const TString calo,const TLorentzVector mom, const AliAODCaloCluster * cluster) const {
 290         //Recalculated PID with all parameters
 291         if(fDebug > 0)printf("AliCaloPID::GetPdg: Calorimeter %s, E %3.2f, l0 %3.2f, l1 %3.2f, disp %3.2f, tof %1.11f, distCPV %3.2f, distToBC %1.1f, NMax %d\n",
 292                                                  calo.Data(),mom.E(),cluster->GetM02(),cluster->GetM20(),cluster->GetDispersion(),cluster->GetTOF(),
 293                                                  cluster->GetEmcCpvDistance(), cluster->GetDistToBadChannel(),cluster->GetNExMax());
 294
 295         if(calo == "EMCAL") {
 296                 if(cluster->GetM02()< 0.25) return kPhoton ;
 297                 else return  kNeutralHadron ;
 298         }
 299
 300         //   if(calo == "PHOS") {
 301         //    if(cluster->GetM02()< 0.25) return kPhoton ;
 302         //    else return  kNeutralHadron ;
 303         //  }
 304
 305         return  kNeutralHadron ;
 306
 307 }
 308
 309 //__________________________________________________
 310 TString  AliCaloPID::GetPIDParametersList()  {
 311         //Put data member values in string to keep in output container
 312
 313         TString parList ; //this will be list of parameters used for this analysis.
 314         char onePar[255] ;
 315         sprintf(onePar,"--- AliCaloPID ---\n") ;
 316         parList+=onePar ;
 317         sprintf(onePar,"fDispCut =%2.2f (Cut on dispersion, used in PID evaluation) \n",fDispCut) ;
 318         parList+=onePar ;
 319         sprintf(onePar,"fTOFCut  =%e (Cut on TOF, used in PID evaluation) \n",fTOFCut) ;
 320         parList+=onePar ;
 321         sprintf(onePar,"fEMCALPhotonWeight =%2.2f (EMCAL bayesian weight for photons)\n",fEMCALPhotonWeight) ;
 322         parList+=onePar ;
 323         sprintf(onePar,"fEMCALPi0Weight =%2.2f (EMCAL bayesian weight for pi0)\n",fEMCALPi0Weight) ;
 324         parList+=onePar ;
 325         sprintf(onePar,"fEMCALElectronWeight =%2.2f(EMCAL bayesian weight for electrons)\n",fEMCALElectronWeight) ;
 326         parList+=onePar ;
 327         sprintf(onePar,"fEMCALChargeWeight =%2.2f (EMCAL bayesian weight for charged hadrons)\n",fEMCALChargeWeight) ;
 328         parList+=onePar ;
 329         sprintf(onePar,"fEMCALNeutralWeight =%2.2f (EMCAL bayesian weight for neutral hadrons)\n",fEMCALNeutralWeight) ;
 330         parList+=onePar ;
 331         sprintf(onePar,"fPHOSPhotonWeight =%2.2f (PHOS bayesian weight for photons)\n",fPHOSPhotonWeight) ;
 332         parList+=onePar ;
 333         sprintf(onePar,"fPHOSPi0Weight =%2.2f (PHOS bayesian weight for pi0)\n",fPHOSPi0Weight) ;
 334         parList+=onePar ;
 335         sprintf(onePar,"fPHOSElectronWeight =%2.2f(PHOS bayesian weight for electrons)\n",fPHOSElectronWeight) ;
 336         parList+=onePar ;
 337         sprintf(onePar,"fPHOSChargeWeight =%2.2f (PHOS bayesian weight for charged hadrons)\n",fPHOSChargeWeight) ;
 338         parList+=onePar ;
 339         sprintf(onePar,"fPHOSNeutralWeight =%2.2f (PHOS bayesian weight for neutral hadrons)\n",fPHOSNeutralWeight) ;
 340         parList+=onePar ;
 341
 342         if(fPHOSWeightFormula){
 343                 parList+="PHOS Photon Weight Formula: "+(fPHOSPhotonWeightFormula->GetExpFormula("p"));
 344                 parList+="PHOS Pi0    Weight Formula: "+(fPHOSPi0WeightFormula->GetExpFormula("p"));
 345         }
 346
 347         return parList;
 348
 349 }
 350
 351 //________________________________________________________________
 352 void AliCaloPID::Print(const Option_t * opt) const
 353 {
 354
 355         //Print some relevant parameters set for the analysis
 356         if(! opt)
 357                 return;
 358
 359         printf("***** Print: %s %s ******\n", GetName(), GetTitle() ) ;
 360
 361         printf("PHOS PID weight , photon %0.2f, pi0 %0.2f, e %0.2f, charge %0.2f, neutral %0.2f \n",
 362                    fPHOSPhotonWeight,  fPHOSPi0Weight,
 363                    fPHOSElectronWeight,  fPHOSChargeWeight,   fPHOSNeutralWeight) ;
 364         printf("EMCAL PID weight, photon %0.2f, pi0 %0.2f, e %0.2f, charge %0.2f, neutral %0.2f\n",
 365                    fEMCALPhotonWeight,  fEMCALPi0Weight,
 366                    fEMCALElectronWeight,  fEMCALChargeWeight,  fEMCALNeutralWeight) ;
 367
 368         printf("PHOS Parametrized weight on?  =     %d\n",  fPHOSWeightFormula) ;
 369         if(fPHOSWeightFormula){
 370                 printf("Photon weight formula = %s\n", (fPHOSPhotonWeightFormula->GetExpFormula("p")).Data());
 371                 printf("Pi0    weight formula = %s\n", (fPHOSPhotonWeightFormula->GetExpFormula("p")).Data());
 372     }
 373
 374         printf("TOF cut        = %e\n",fTOFCut);
 375         printf("Dispersion cut = %2.2f\n",fDispCut);
 376         printf("Debug level    = %d\n",fDebug);
 377
 378         printf(" \n");
 379
 380 }
 381
 382 //_______________________________________________________________
 383 void AliCaloPID::SetPIDBits(const TString calo, const AliAODCaloCluster * cluster, AliAODPWG4Particle * ph) {
 384         //Set Bits for PID selection
 385
 386         //Dispersion/lambdas
 387     Double_t disp=cluster->GetDispersion()  ;
 388         //    Double_t m20=calo->GetM20() ;
 389         //    Double_t m02=calo->GetM02() ;
 390     ph->SetDispBit(disp<fDispCut) ;
 391
 392     //TOF
 393     Double_t tof=cluster->GetTOF()  ;
 394     ph->SetTOFBit(TMath::Abs(tof)<fTOFCut) ;
 395
 396     //Charged veto
 397         //    Double_t cpvR=calo->GetEmcCpvDistance() ;
 398     Int_t ntr=cluster->GetNTracksMatched();  //number of track matched
 399     ph->SetChargedBit(ntr>0) ;  //Temporary cut, should we evaluate distance?
 400
 401     //Set PID pdg
 402         ph->SetPdg(GetPdg(calo,cluster->PID(),ph->E()));
 403
 404         if(fDebug > 0){
 405                 printf("AliCaloPID::SetPIDBits: TOF %e, Dispersion %2.2f, NTracks %d\n",tof , disp, ntr);
 406                 printf("AliCaloPID::SetPIDBits: pdg %d, bits: TOF %d, Dispersion %d, Charge %d\n",
 407                            ph->GetPdg(), ph->GetTOFBit() , ph->GetDispBit() , ph->GetChargedBit());
 408         }
 409 }
 410
 411