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
  37 ClassImp(AliCaloPID)
  38
  39
  40 //________________________________________________
  41 AliCaloPID::AliCaloPID() :
  42 TObject(), fEMCALPhotonWeight(0.), fEMCALPi0Weight(0.),
  43 fEMCALElectronWeight(0.),  fEMCALChargeWeight(0.),
  44 fEMCALNeutralWeight(0.),
  45 fPHOSPhotonWeight(0.), fPHOSPi0Weight(0.),
  46 fPHOSElectronWeight(0.), fPHOSChargeWeight(0.) ,
  47 fPHOSNeutralWeight(0.), fPHOSWeightFormula(0),
  48 fPHOSPhotonWeightFormula(0x0), fPHOSPi0WeightFormula(0x0),
  49 fDispCut(0.),fTOFCut(0.), fDebug(-1)
  50 {
  51         //Ctor
  52
  53         //Initialize parameters
  54         InitParameters();
  55 }
  56
  57 //____________________________________________________________________________
  58 AliCaloPID::AliCaloPID(const AliCaloPID & pid) :
  59 TObject(pid), fEMCALPhotonWeight(pid.fEMCALPhotonWeight),
  60 fEMCALPi0Weight(pid.fEMCALPi0Weight),
  61 fEMCALElectronWeight(pid.fEMCALElectronWeight),
  62 fEMCALChargeWeight(pid.fEMCALChargeWeight),
  63 fEMCALNeutralWeight(pid.fEMCALNeutralWeight),
  64 fPHOSPhotonWeight(pid.fPHOSPhotonWeight),
  65 fPHOSPi0Weight(pid.fPHOSPi0Weight),
  66 fPHOSElectronWeight(pid.fPHOSElectronWeight),
  67 fPHOSChargeWeight(pid.fPHOSChargeWeight),
  68 fPHOSNeutralWeight(pid.fPHOSNeutralWeight),
  69 fPHOSWeightFormula(pid.fPHOSWeightFormula),
  70 fPHOSPhotonWeightFormula(pid.fPHOSPhotonWeightFormula),
  71 fPHOSPi0WeightFormula(pid.fPHOSPi0WeightFormula),
  72 fDispCut(pid.fDispCut),fTOFCut(pid.fTOFCut),
  73 fDebug(pid.fDebug)
  74 {
  75         // cpy ctor
  76
  77 }
  78
  79 //_________________________________________________________________________
  80 AliCaloPID & AliCaloPID::operator = (const AliCaloPID & pid)
  81 {
  82         // assignment operator
  83
  84         if(&pid == this) return *this;
  85
  86         fEMCALPhotonWeight = pid. fEMCALPhotonWeight ;
  87         fEMCALPi0Weight = pid.fEMCALPi0Weight ;
  88         fEMCALElectronWeight = pid.fEMCALElectronWeight;
  89         fEMCALChargeWeight = pid.fEMCALChargeWeight;
  90         fEMCALNeutralWeight = pid.fEMCALNeutralWeight;
  91
  92         fPHOSPhotonWeight = pid.fPHOSPhotonWeight ;
  93         fPHOSPi0Weight = pid.fPHOSPi0Weight ;
  94         fPHOSElectronWeight = pid.fPHOSElectronWeight;
  95         fPHOSChargeWeight = pid.fPHOSChargeWeight;
  96         fPHOSNeutralWeight = pid.fPHOSNeutralWeight;
  97
  98         fPHOSWeightFormula       = pid.fPHOSWeightFormula;
  99         fPHOSPhotonWeightFormula = pid.fPHOSPhotonWeightFormula;
 100         fPHOSPi0WeightFormula    = pid.fPHOSPi0WeightFormula;
 101
 102         fDispCut  = pid.fDispCut;
 103         fTOFCut   = pid.fTOFCut;
 104         fDebug    = pid.fDebug;
 105
 106         return *this;
 107
 108 }
 109
 110 //_________________________________
 111 AliCaloPID::~AliCaloPID() {
 112         //Dtor
 113
 114         if(fPHOSPhotonWeightFormula) delete  fPHOSPhotonWeightFormula ;
 115         if(fPHOSPi0WeightFormula) delete  fPHOSPi0WeightFormula ;
 116
 117 }
 118
 119
 120 //_______________________________________________________________
 121 void AliCaloPID::InitParameters()
 122 {
 123         //Initialize the parameters of the PID.
 124
 125         fEMCALPhotonWeight   = 0.8 ;
 126         fEMCALPi0Weight      = 0.5 ;
 127         fEMCALElectronWeight = 0.8 ;
 128         fEMCALChargeWeight   = 0.5 ;
 129         fEMCALNeutralWeight  = 0.5 ;
 130
 131         fPHOSPhotonWeight    = 0.75 ;
 132         fPHOSPi0Weight       = 0.8 ;
 133         fPHOSElectronWeight  = 0.5 ;
 134         fPHOSChargeWeight    = 0.5 ;
 135         fPHOSNeutralWeight   = 0.5 ;
 136
 137         //Formula to set the PID weight threshold for photon or pi0
 138         fPHOSWeightFormula = kTRUE;
 139         fPHOSPhotonWeightFormula =
 140     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))");
 141         fPHOSPi0WeightFormula =
 142     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))");
 143
 144     fDispCut  = 1.5;
 145         fTOFCut   = 5.e-9;
 146         fDebug = -1;
 147 }
 148
 149 //_______________________________________________________________
 150 Int_t AliCaloPID::GetPdg(const TString calo, const Double_t * pid, const Float_t energy) const {
 151         //Return most probable identity of the particle.
 152
 153         if(!pid) AliFatal("pid pointer not initialized!!!");
 154
 155         Float_t wPh =  fPHOSPhotonWeight ;
 156         Float_t wPi0 =  fPHOSPi0Weight ;
 157         Float_t wE =  fPHOSElectronWeight ;
 158         Float_t wCh =  fPHOSChargeWeight ;
 159         Float_t wNe =  fPHOSNeutralWeight ;
 160
 161
 162         if(calo == "PHOS" && fPHOSWeightFormula){
 163                 wPh  = fPHOSPhotonWeightFormula->Eval(energy) ;
 164                 wPi0 = fPHOSPi0WeightFormula->Eval(energy);
 165         }
 166
 167         if(calo == "EMCAL"){
 168
 169                 wPh  =  fEMCALPhotonWeight ;
 170                 wPi0 =  fEMCALPi0Weight ;
 171                 wE   =  fEMCALElectronWeight ;
 172                 wCh  =  fEMCALChargeWeight ;
 173                 wNe  =  fEMCALNeutralWeight ;
 174
 175         }
 176
 177         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",
 178                                                    calo.Data(),pid[AliAODCluster::kPhoton], pid[AliAODCluster::kPi0],
 179                                                    pid[AliAODCluster::kElectron], pid[AliAODCluster::kEleCon],
 180                                                    pid[AliAODCluster::kPion], pid[AliAODCluster::kKaon], pid[AliAODCluster::kProton],
 181                                                    pid[AliAODCluster::kNeutron], pid[AliAODCluster::kKaon0]);
 182
 183         Int_t pdg = kNeutralUnknown ;
 184         Float_t chargedHadronWeight = pid[AliAODCluster::kProton]+pid[AliAODCluster::kKaon]+
 185     pid[AliAODCluster::kPion]+pid[AliAODCluster::kMuon];
 186         Float_t neutralHadronWeight = pid[AliAODCluster::kNeutron]+pid[AliAODCluster::kKaon0];
 187         Float_t allChargedWeight    = pid[AliAODCluster::kElectron]+pid[AliAODCluster::kEleCon]+ chargedHadronWeight;
 188         Float_t allNeutralWeight    = pid[AliAODCluster::kPhoton]+pid[AliAODCluster::kPi0]+ neutralHadronWeight;
 189
 190         //Select most probable ID
 191         if(calo=="PHOS"){
 192                 if(pid[AliAODCluster::kPhoton] > wPh) pdg = kPhoton ;
 193                 else if(pid[AliAODCluster::kPi0] > wPi0) pdg = kPi0 ;
 194                 else if(pid[AliAODCluster::kElectron] > wE)  pdg = kElectron ;
 195                 else if(pid[AliAODCluster::kEleCon] >  wE) pdg = kEleCon ;
 196                 else if(chargedHadronWeight > wCh) pdg = kChargedHadron ;
 197                 else if(neutralHadronWeight > wNe) pdg = kNeutralHadron ;
 198                 else if(allChargedWeight >  allNeutralWeight)
 199                         pdg = kChargedUnknown ;
 200                 else
 201                         pdg = kNeutralUnknown ;
 202         }
 203         else{//EMCAL
 204                 if(pid[AliAODCluster::kPhoton]  > wPh) pdg = kPhoton ;
 205                 else if(pid[AliAODCluster::kPi0] > wPi0) pdg = kPi0 ;
 206                 else if(pid[AliAODCluster::kElectron]  > wE) pdg = kElectron ;
 207                 else if(chargedHadronWeight + neutralHadronWeight > wCh) pdg = kChargedHadron ;
 208                 else if(neutralHadronWeight + chargedHadronWeight > wNe) pdg = kNeutralHadron ;
 209                 else pdg =  kNeutralUnknown ;
 210
 211         }
 212
 213
 214         if(fDebug > 0)printf("AliCaloPID::GetPdg:Final Pdg: %d \n", pdg);
 215
 216
 217
 218         return pdg ;
 219
 220 }
 221
 222 //_______________________________________________________________
 223 Int_t AliCaloPID::GetPdg(const TString calo,const TLorentzVector mom, const AliAODCaloCluster * cluster) const {
 224         //Recalculated PID with all parameters
 225         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",
 226                                                  calo.Data(),mom.E(),cluster->GetM02(),cluster->GetM20(),cluster->GetDispersion(),cluster->GetTOF(),
 227                                                  cluster->GetEmcCpvDistance(), cluster->GetDistToBadChannel(),cluster->GetNExMax());
 228
 229         if(calo == "EMCAL") {
 230                 if(cluster->GetM02()< 0.25) return kPhoton ;
 231                 else return  kNeutralHadron ;
 232         }
 233
 234         //   if(calo == "PHOS") {
 235         //    if(cluster->GetM02()< 0.25) return kPhoton ;
 236         //    else return  kNeutralHadron ;
 237         //  }
 238
 239         return  kNeutralHadron ;
 240
 241 }
 242
 243 //__________________________________________________
 244 TString  AliCaloPID::GetPIDParametersList()  {
 245         //Put data member values in string to keep in output container
 246
 247         TString parList ; //this will be list of parameters used for this analysis.
 248         char onePar[255] ;
 249         sprintf(onePar,"--- AliCaloPID ---\n") ;
 250         parList+=onePar ;
 251         sprintf(onePar,"fDispCut =%2.2f (Cut on dispersion, used in PID evaluation) \n",fDispCut) ;
 252         parList+=onePar ;
 253         sprintf(onePar,"fTOFCut  =%e (Cut on TOF, used in PID evaluation) \n",fTOFCut) ;
 254         parList+=onePar ;
 255         sprintf(onePar,"fEMCALPhotonWeight =%2.2f (EMCAL bayesian weight for photons)\n",fEMCALPhotonWeight) ;
 256         parList+=onePar ;
 257         sprintf(onePar,"fEMCALPi0Weight =%2.2f (EMCAL bayesian weight for pi0)\n",fEMCALPi0Weight) ;
 258         parList+=onePar ;
 259         sprintf(onePar,"fEMCALElectronWeight =%2.2f(EMCAL bayesian weight for electrons)\n",fEMCALElectronWeight) ;
 260         parList+=onePar ;
 261         sprintf(onePar,"fEMCALChargeWeight =%2.2f (EMCAL bayesian weight for charged hadrons)\n",fEMCALChargeWeight) ;
 262         parList+=onePar ;
 263         sprintf(onePar,"fEMCALNeutralWeight =%2.2f (EMCAL bayesian weight for neutral hadrons)\n",fEMCALNeutralWeight) ;
 264         parList+=onePar ;
 265         sprintf(onePar,"fPHOSPhotonWeight =%2.2f (PHOS bayesian weight for photons)\n",fPHOSPhotonWeight) ;
 266         parList+=onePar ;
 267         sprintf(onePar,"fPHOSPi0Weight =%2.2f (PHOS bayesian weight for pi0)\n",fPHOSPi0Weight) ;
 268         parList+=onePar ;
 269         sprintf(onePar,"fPHOSElectronWeight =%2.2f(PHOS bayesian weight for electrons)\n",fPHOSElectronWeight) ;
 270         parList+=onePar ;
 271         sprintf(onePar,"fPHOSChargeWeight =%2.2f (PHOS bayesian weight for charged hadrons)\n",fPHOSChargeWeight) ;
 272         parList+=onePar ;
 273         sprintf(onePar,"fPHOSNeutralWeight =%2.2f (PHOS bayesian weight for neutral hadrons)\n",fPHOSNeutralWeight) ;
 274         parList+=onePar ;
 275
 276         if(fPHOSWeightFormula){
 277                 parList+="PHOS Photon Weight Formula: "+(fPHOSPhotonWeightFormula->GetExpFormula("p"));
 278                 parList+="PHOS Pi0    Weight Formula: "+(fPHOSPi0WeightFormula->GetExpFormula("p"));
 279         }
 280
 281         return parList;
 282
 283 }
 284
 285 //________________________________________________________________
 286 void AliCaloPID::Print(const Option_t * opt) const
 287 {
 288
 289         //Print some relevant parameters set for the analysis
 290         if(! opt)
 291                 return;
 292
 293         printf("***** Print: %s %s ******\n", GetName(), GetTitle() ) ;
 294
 295         printf("PHOS PID weight , photon %0.2f, pi0 %0.2f, e %0.2f, charge %0.2f, neutral %0.2f \n",
 296                    fPHOSPhotonWeight,  fPHOSPi0Weight,
 297                    fPHOSElectronWeight,  fPHOSChargeWeight,   fPHOSNeutralWeight) ;
 298         printf("EMCAL PID weight, photon %0.2f, pi0 %0.2f, e %0.2f, charge %0.2f, neutral %0.2f\n",
 299                    fEMCALPhotonWeight,  fEMCALPi0Weight,
 300                    fEMCALElectronWeight,  fEMCALChargeWeight,  fEMCALNeutralWeight) ;
 301
 302         printf("PHOS Parametrized weight on?  =     %d\n",  fPHOSWeightFormula) ;
 303         if(fPHOSWeightFormula){
 304                 printf("Photon weight formula = %s\n", (fPHOSPhotonWeightFormula->GetExpFormula("p")).Data());
 305                 printf("Pi0    weight formula = %s\n", (fPHOSPhotonWeightFormula->GetExpFormula("p")).Data());
 306     }
 307
 308         printf("TOF cut        = %e\n",fTOFCut);
 309         printf("Dispersion cut = %2.2f\n",fDispCut);
 310         printf("Debug level    = %d\n",fDebug);
 311
 312         printf(" \n");
 313
 314 }
 315
 316 //_______________________________________________________________
 317 void AliCaloPID::SetPIDBits(const TString calo, const AliAODCaloCluster * cluster, AliAODPWG4Particle * ph) {
 318         //Set Bits for PID selection
 319
 320         //Dispersion/lambdas
 321     Double_t disp=cluster->GetDispersion()  ;
 322         //    Double_t m20=calo->GetM20() ;
 323         //    Double_t m02=calo->GetM02() ;
 324     ph->SetDispBit(disp<fDispCut) ;
 325
 326     //TOF
 327     Double_t tof=cluster->GetTOF()  ;
 328     ph->SetTOFBit(TMath::Abs(tof)<fTOFCut) ;
 329
 330     //Charged veto
 331         //    Double_t cpvR=calo->GetEmcCpvDistance() ;
 332     Int_t ntr=cluster->GetNTracksMatched();  //number of track matched
 333     ph->SetChargedBit(ntr>0) ;  //Temporary cut, should we evaluate distance?
 334
 335     //Set PID pdg
 336     ph->SetPdg(GetPdg(calo,cluster->PID(),ph->E()));
 337
 338     if(fDebug > 0){
 339       printf("AliCaloPID::SetPIDBits: TOF %e, Dispersion %2.2f, NTracks %d\n",tof , disp, ntr);
 340       printf("AliCaloPID::SetPIDBits: pdg %d, bits: TOF %d, Dispersion %d, Charge %d\n",
 341              ph->GetPdg(), ph->GetTOFBit() , ph->GetDispBit() , ph->GetChargedBit());
 342     }
 343 }
 344
 345