PWG4/PartCorrBase/AliMCAnalysisUtils.cxx

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  15 /* $Id: AliMCAnalysisUtils.cxx 21839 2007-10-29 13:49:42Z gustavo $ */
  16
  17 //_________________________________________________________________________
  18 // Class for analysis utils for MC data
  19 // stored in stack or event header.
  20 // Contains:
  21 //  - method to check the origin of a given track/cluster
  22 //  - method to obtain the generated jets
  23 //
  24 //*-- Author: Gustavo Conesa (LNF-INFN)
  25 //////////////////////////////////////////////////////////////////////////////
  26
  27
  28 // --- ROOT system ---
  29 #include <TMath.h>
  30 #include <TString.h>
  31 #include <TList.h>
  32
  33 //---- ANALYSIS system ----
  34 #include "AliLog.h"
  35 #include "AliMCAnalysisUtils.h"
  36 #include "AliStack.h"
  37 #include "TParticle.h"
  38 #include "AliGenPythiaEventHeader.h"
  39
  40 ClassImp(AliMCAnalysisUtils)
  41
  42
  43 //________________________________________________
  44 AliMCAnalysisUtils::AliMCAnalysisUtils() :
  45 TObject(), fCurrentEvent(-1), fDebug(-1),
  46 fJetsList(new TList), fMCGenerator("PYTHIA")
  47 {
  48         //Ctor
  49 }
  50
  51 //____________________________________________________________________________
  52 AliMCAnalysisUtils::AliMCAnalysisUtils(const AliMCAnalysisUtils & mcutils) :
  53 TObject(mcutils), fCurrentEvent(mcutils.fCurrentEvent), fDebug(mcutils.fDebug),
  54 fJetsList(mcutils.fJetsList), fMCGenerator(mcutils.fMCGenerator)
  55 {
  56         // cpy ctor
  57
  58 }
  59
  60 //_________________________________________________________________________
  61 AliMCAnalysisUtils & AliMCAnalysisUtils::operator = (const AliMCAnalysisUtils & mcutils)
  62 {
  63         // assignment operator
  64
  65         if(&mcutils == this) return *this;
  66         fCurrentEvent = mcutils.fCurrentEvent ;
  67         fDebug        = mcutils.fDebug;
  68         fJetsList     = mcutils.fJetsList;
  69         fMCGenerator  = mcutils.fMCGenerator;
  70
  71         return *this;
  72
  73 }
  74
  75 //____________________________________________________________________________
  76 AliMCAnalysisUtils::~AliMCAnalysisUtils()
  77 {
  78         // Remove all pointers.
  79
  80         if (fJetsList) {
  81                 fJetsList->Clear();
  82                 delete fJetsList ;
  83         }
  84
  85 }
  86
  87 //_________________________________________________________________________
  88 Int_t AliMCAnalysisUtils::CheckOrigin(const Int_t label, AliStack * stack) const {
  89   //Play with the MC stack if available
  90   //Check origin of the candidates, good for PYTHIA
  91
  92   if(!stack) AliFatal("Stack is not available, check analysis settings in configuration file, STOP!!");
  93   //  printf("label %d, ntrack %d, nprim %d\n",label, stack->GetNtrack(), stack->GetNprimary());
  94 //   for(Int_t i = 0; i< stack->GetNprimary(); i++){
  95 //      TParticle *particle =   stack->Particle(i);
  96 //                      //particle->Print();
  97 //   }
  98   if(label >= 0 && label <  stack->GetNtrack()){
  99     //Mother
 100     TParticle * mom = stack->Particle(label);
 101     Int_t mPdg = TMath::Abs(mom->GetPdgCode());
 102     Int_t mStatus =  mom->GetStatusCode() ;
 103     Int_t iParent =  mom->GetFirstMother() ;
 104     if(fDebug > 0 && label < 8 ) printf("AliMCAnalysisUtils::CheckOrigin: Mother is parton %d\n",iParent);
 105
 106     //GrandParent
 107     TParticle * parent = new TParticle ;
 108     Int_t pPdg = -1;
 109     Int_t pStatus =-1;
 110     if(iParent > 0){
 111       parent = stack->Particle(iParent);
 112       pPdg = TMath::Abs(parent->GetPdgCode());
 113       pStatus = parent->GetStatusCode();
 114     }
 115     else if(fDebug > 0 ) printf("AliMCAnalysisUtils::CheckOrigin: Parent with label %d\n",iParent);
 116
 117     //return tag
 118     if(mPdg == 22){
 119       if(mStatus == 1){
 120         if(fMCGenerator == "PYTHIA"){
 121           if(iParent < 8 && iParent > 5) {//outgoing partons
 122             if(pPdg == 22) return kMCPrompt;
 123             else  return kMCFragmentation;
 124           }//Outgoing partons
 125           else if(pStatus == 11){//Decay
 126             if(pPdg == 111) return kMCPi0Decay ;
 127             else if (pPdg == 321)  return kMCEtaDecay ;
 128             else  return kMCOtherDecay ;
 129           }//Decay
 130           else return kMCISR; //Initial state radiation
 131         }//PYTHIA
 132
 133         else if(fMCGenerator == "HERWIG"){
 134           if(pStatus < 197){//Not decay
 135             while(1){
 136               if(parent->GetFirstMother()<=5) break;
 137               iParent = parent->GetFirstMother();
 138               parent=stack->Particle(iParent);
 139               pStatus= parent->GetStatusCode();
 140               pPdg = parent->GetPdgCode();
 141             }//Look for the parton
 142
 143             if(iParent < 8 && iParent > 5) {
 144               if(pPdg == 22) return kMCPrompt;
 145               else  return kMCFragmentation;
 146             }
 147             return kMCISR;//Initial state radiation
 148           }//Not decay
 149           else{//Decay
 150             if(pPdg == 111) return kMCPi0Decay ;
 151             else if (pPdg == 321)  return kMCEtaDecay ;
 152             else  return kMCOtherDecay ;
 153           }//Decay
 154         }//HERWIG
 155         else return  kMCUnknown;
 156       }//Status 1 : Pythia generated
 157       else if(mStatus == 0){
 158         if(pPdg ==22 || pPdg ==11|| pPdg == 2112 ||  pPdg == 211 ||
 159            pPdg == 321 ||  pPdg == 2212  ||  pPdg == 130  ||  pPdg == 13 )
 160           return kMCConversion ;
 161         if(pPdg == 111) return kMCPi0Decay ;
 162         else if (pPdg == 221)  return kMCEtaDecay ;
 163         else  return kMCOtherDecay ;
 164       }//status 0 : geant generated
 165     }//Mother Photon
 166     else if(mPdg == 111)  return kMCPi0 ;
 167     else if(mPdg == 221)  return kMCEta ;
 168     else if(mPdg ==11){
 169 //       if(pPdg !=22 &&mStatus == 0) {
 170 //      printf("Origin electron, pT %f, status %d, parent %s, pstatus %d, vx %f, vy %f, vz %f\n",
 171 //             mom->Pt(),mStatus, parent->GetName(),pStatus,mom->Vx(),mom->Vy(), mom->Vz());
 172
 173 //       }
 174
 175       if(mStatus == 0) {
 176         if(pPdg ==22) return kMCConversion ;
 177         else if (pStatus == 0) return kMCConversion;
 178         else return kMCElectron ;
 179       }
 180       else return kMCElectron ;
 181     }
 182     else return kMCUnknown;
 183   }//Good label value
 184   else{
 185     if(label < 0 ) printf("AliMCAnalysisUtils::CheckOrigin: *** bad label or no stack ***:  label %d \n", label);
 186     if(label >=  stack->GetNtrack()) printf("AliMCAnalysisUtils::CheckOrigin: *** large label ***:  label %d, n tracks %d \n", label, stack->GetNtrack());
 187     return kMCUnknown;
 188   }//Bad label
 189
 190   return kMCUnknown;
 191
 192 }
 193
 194 //_________________________________________________________________________
 195 TList * AliMCAnalysisUtils::GetJets(Int_t iEvent, AliStack * stack, AliGenEventHeader * geh) {
 196  //Return list of jets (TParticles) and index of most likely parton that originated it.
 197
 198         if(fCurrentEvent!=iEvent){
 199                 fCurrentEvent = iEvent;
 200                 fJetsList = new TList;
 201                 Int_t nTriggerJets = 0;
 202                 Float_t tmpjet[]={0,0,0,0};
 203
 204                 //printf("Event %d %d\n",fCurrentEvent,iEvent);
 205                 //Get outgoing partons
 206                 if(stack->GetNtrack() < 8) return fJetsList;
 207                 TParticle * parton1 =  stack->Particle(6);
 208                 TParticle * parton2 =  stack->Particle(7);
 209                 if(fDebug > 2){
 210                         printf("parton 6 : %s, pt %2.2f,E %2.2f, phi %2.2f, eta %2.2f \n",
 211                                 parton1->GetName(),parton1->Pt(),parton1->Energy(),parton1->Phi()*TMath::RadToDeg(),parton1->Eta());
 212                         printf("parton 7 : %s, pt %2.2f,E %2.2f, phi %2.2f, eta %2.2f \n",
 213                                 parton2->GetName(),parton2->Pt(),parton2->Energy(),parton2->Phi()*TMath::RadToDeg(),parton2->Eta());
 214                 }
 215 //              //Trace the jet from the mother parton
 216 //              Float_t pt  = 0;
 217 //              Float_t pt1 = 0;
 218 //              Float_t pt2 = 0;
 219 //              Float_t e   = 0;
 220 //              Float_t e1  = 0;
 221 //              Float_t e2  = 0;
 222 //              TParticle * tmptmp = new TParticle;
 223 //              for(Int_t i = 0; i< stack->GetNprimary(); i++){
 224 //                      tmptmp = stack->Particle(i);
 225
 226 //                      if(tmptmp->GetStatusCode() == 1){
 227 //                              pt = tmptmp->Pt();
 228 //                              e =  tmptmp->Energy();
 229 //                              Int_t imom = tmptmp->GetFirstMother();
 230 //                              Int_t imom1 = 0;
 231 //                              //printf("1st imom %d\n",imom);
 232 //                              while(imom > 5){
 233 //                                      imom1=imom;
 234 //                                      tmptmp = stack->Particle(imom);
 235 //                                      imom = tmptmp->GetFirstMother();
 236 //                                      //printf("imom %d       \n",imom);
 237 //                              }
 238 //                              //printf("Last imom %d %d\n",imom1, imom);
 239 //                              if(imom1 == 6) {
 240 //                                      pt1+=pt;
 241 //                                      e1+=e;
 242 //                              }
 243 //                              else if (imom1 == 7){
 244 //                                      pt2+=pt;
 245 //                                      e2+=e;                                  }
 246 //                      }// status 1
 247
 248 //              }// for
 249
 250 //              printf("JET 1, pt %2.2f, e %2.2f; JET 2, pt %2.2f, e %2.2f \n",pt1,e1,pt2,e2);
 251
 252                 //Get the jet, different way for different generator
 253                 //PYTHIA
 254                 if(fMCGenerator == "PYTHIA"){
 255                         TParticle * jet =  new TParticle;
 256                         AliGenPythiaEventHeader* pygeh= (AliGenPythiaEventHeader*) geh;
 257                         nTriggerJets =  pygeh->NTriggerJets();
 258                         //if(fDebug > 1)
 259                                 printf("PythiaEventHeader: Njets: %d\n",nTriggerJets);
 260                         Int_t iparton = -1;
 261                         for(Int_t i = 0; i< nTriggerJets; i++){
 262                                 iparton=-1;
 263                                 pygeh->TriggerJet(i, tmpjet);
 264                                 jet = new TParticle(94, 21, -1, -1, -1, -1, tmpjet[0],tmpjet[1],tmpjet[2],tmpjet[3], 0,0,0,0);
 265                                 //Assign an outgoing parton as mother
 266                                 Float_t phidiff1 = TMath::Abs(jet->Phi()-parton1->Phi());
 267                                 Float_t phidiff2 = TMath::Abs(jet->Phi()-parton2->Phi());
 268                                 if(phidiff1 > phidiff2) jet->SetFirstMother(7);
 269                                 else  jet->SetFirstMother(6);
 270                                 //jet->Print();
 271                                 if(fDebug > 1)
 272                                   printf("PYTHIA Jet %d: mother %d, pt %2.2f,E %2.2f, phi %2.2f, eta %2.2f \n",
 273                                          i, jet->GetFirstMother(),jet->Pt(),jet->Energy(),jet->Phi()*TMath::RadToDeg(),jet->Eta());
 274                                 fJetsList->Add(jet);
 275                         }
 276                 }//Pythia triggered jets
 277                 //HERWIG
 278                 else if (fMCGenerator=="HERWIG"){
 279                         Int_t pdg = -1;
 280                         //Check parton 1
 281                         TParticle * tmp = parton1;
 282                         if(parton1->GetPdgCode()!=22){
 283                                 while(pdg != 94){
 284                                         if(tmp->GetFirstDaughter()==-1) return fJetsList;
 285                                         tmp = stack->Particle(tmp->GetFirstDaughter());
 286                                         pdg = tmp->GetPdgCode();
 287                                 }//while
 288
 289                                 //Add found jet to list
 290                                 TParticle *jet1 = new TParticle(*tmp);
 291                                 jet1->SetFirstMother(6);
 292                                 fJetsList->Add(jet1);
 293                                 //printf("jet 1:  first daughter %d, last daughter %d\n", tmp->GetFirstDaughter(), tmp->GetLastDaughter());
 294                                 //tmp = stack->Particle(tmp->GetFirstDaughter());
 295                                 //tmp->Print();
 296                                 //jet1->Print();
 297                                 if(fDebug > 1)
 298                                         printf("HERWIG Jet 1: mother %d, status %d, pt %2.2f,E %2.2f, phi %2.2f, eta %2.2f \n",
 299                                                 jet1->GetFirstMother(),jet1->GetStatusCode(),jet1->Pt(),jet1->Energy(),jet1->Phi()*TMath::RadToDeg(),jet1->Eta());
 300                         }//not photon
 301
 302                         //Check parton 2
 303                         pdg = -1;
 304                         tmp = parton2;
 305                         Int_t i = -1;
 306                         if(parton2->GetPdgCode()!=22){
 307                                 while(pdg != 94){
 308                                         if(tmp->GetFirstDaughter()==-1) return fJetsList;
 309                                         i = tmp->GetFirstDaughter();
 310                                         tmp = stack->Particle(tmp->GetFirstDaughter());
 311                                         pdg = tmp->GetPdgCode();
 312                                 }//while
 313                                 //Add found jet to list
 314                                 TParticle *jet2 = new TParticle(*tmp);
 315                                 jet2->SetFirstMother(7);
 316                                 fJetsList->Add(jet2);
 317                                 //jet2->Print();
 318                                 if(fDebug > 1)
 319                                         printf("HERWIG Jet 2: mother %d, status %d, pt %2.2f,E %2.2f, phi %2.2f, eta %2.2f \n",
 320                                         jet2->GetFirstMother(),jet2->GetStatusCode(),jet2->Pt(),jet2->Energy(),jet2->Phi()*TMath::RadToDeg(),jet2->Eta());
 321                                         Int_t first =  tmp->GetFirstDaughter();
 322                                         Int_t last  =  tmp->GetLastDaughter();
 323                                         printf("jet 2:  first daughter %d, last daughter %d, pdg %d\n",first, last, tmp->GetPdgCode());
 324                                 //      for(Int_t d = first ; d < last+1; d++){
 325 //                                              tmp = stack->Particle(d);
 326 //                                              if(i == tmp->GetFirstMother())
 327 //                                                      printf("Daughter n %d, Mother %d, name %s, status %d, pT %2.2f,E %2.2f, phi %2.2f, eta %2.2f \n",
 328 //                                                      d,tmp->GetFirstMother(), tmp->GetName(), tmp->GetStatusCode(),tmp->Pt(),tmp->Energy(),tmp->Phi()*TMath::RadToDeg(),tmp->Eta());
 329 //                         }
 330                                                    //tmp->Print();
 331                            }//not photon
 332                 }//Herwig generated jets
 333         }
 334
 335         return fJetsList;
 336 }
 337
 338 //________________________________________________________________
 339 void AliMCAnalysisUtils::Print(const Option_t * opt) const
 340 {
 341
 342         //Print some relevant parameters set for the analysis
 343         if(! opt)
 344                 return;
 345
 346         printf("***** Print: %s %s ******\n", GetName(), GetTitle() ) ;
 347
 348         printf("Debug level    = %d\n",fDebug);
 349         printf("MC Generator   = %s\n",fMCGenerator.Data());
 350
 351         printf(" \n");
 352
 353 }
 354
 355