PWG3/vertexingHF/AliCFVertexingHF2Prong.cxx

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  15
  16 //-----------------------------------------------------------------------
  17 // Class for HF corrections as a function of many variables and step
  18 // Author : C. Zampolli, CERN
  19 // D. Caffarri, Univ & INFN Padova caffarri@pd.infn.it
  20 // Base class for HF Unfolding - agrelli@uu.nl
  21 //-----------------------------------------------------------------------
  22
  23 #include "AliAODRecoDecayHF2Prong.h"
  24 #include "AliAODMCParticle.h"
  25 #include "AliAODEvent.h"
  26 #include "TClonesArray.h"
  27 #include "AliCFVertexingHF.h"
  28 #include "AliESDtrack.h"
  29 #include "TDatabasePDG.h"
  30
  31 #include "AliCFVertexingHF2Prong.h"
  32 #include "AliCFContainer.h"
  33
  34 ClassImp(AliCFVertexingHF2Prong)
  35
  36
  37 //_________________________________________
  38   AliCFVertexingHF2Prong::AliCFVertexingHF2Prong(TClonesArray *mcArray, UShort_t originDselection):
  39           AliCFVertexingHF(mcArray, originDselection)
  40 {
  41         //
  42         // constructor
  43         //
  44
  45         SetNProngs(2);
  46         fPtAccCut=new Float_t[fProngs];
  47         fEtaAccCut=new Float_t[fProngs];
  48         for(Int_t iP=0; iP<fProngs; iP++){
  49                 fPtAccCut[iP]=0.1;
  50                 fEtaAccCut[iP]=0.9;
  51         }
  52
  53 }
  54
  55
  56 //_____________________________________
  57 AliCFVertexingHF2Prong& AliCFVertexingHF2Prong::operator=(const AliCFVertexingHF2Prong& c)
  58 {
  59         //
  60         // copy constructor
  61         //
  62
  63         if  (this != &c) {
  64                 AliCFVertexingHF::operator=(c);
  65         }
  66         return *this;
  67 }
  68
  69 //__________________________________________
  70 Bool_t AliCFVertexingHF2Prong::SetRecoCandidateParam(AliAODRecoDecayHF *recoCand)
  71 {
  72         //
  73         // setting the recontructed candidate
  74         //
  75
  76         Bool_t bSignAssoc = kFALSE;
  77         fRecoCandidate = recoCand;
  78         if (!fRecoCandidate) {
  79                 AliError("fRecoCandidate not found, problem in assignement\n");
  80                 return bSignAssoc;
  81         }
  82
  83         if (fRecoCandidate->GetPrimaryVtx()) AliDebug(3,"fReco Candidate has a pointer to PrimVtx\n");
  84         if (recoCand->GetPrimaryVtx()) AliDebug(3,"Reco Cand has a pointer to PrimVtx\n");
  85
  86         Int_t pdgCand = 421;
  87         Int_t pdgDgD0toKpi[2]={321,211};
  88         Int_t nentries = fmcArray->GetEntriesFast();
  89
  90         AliDebug(3,Form("nentries = %d\n", nentries));
  91
  92         Int_t mcLabel = fRecoCandidate->MatchToMC(pdgCand,fmcArray,2,pdgDgD0toKpi);
  93         if (mcLabel == -1) return bSignAssoc;
  94
  95         if ((fRecoCandidate->NumberOfFakeDaughters()>0)&&(fFakeSelection==1)) return bSignAssoc;
  96         if ((fRecoCandidate->NumberOfFakeDaughters()==0)&&(fFakeSelection==2)) return bSignAssoc;
  97
  98         SetMCLabel(mcLabel);
  99         fmcPartCandidate = dynamic_cast<AliAODMCParticle*>(fmcArray->At(fmcLabel));
 100         if (!fmcPartCandidate){
 101                 AliDebug(3,"No part candidate");
 102                 return bSignAssoc;
 103         }
 104         bSignAssoc = kTRUE;
 105         return bSignAssoc;
 106 }
 107
 108 //______________________________________________
 109 Bool_t AliCFVertexingHF2Prong::GetGeneratedValuesFromMCParticle(Double_t* vectorMC)
 110 {
 111         //
 112         // collecting all the necessary info (pt, y, cosThetaStar, ptPi, ptKa, cT) from MC particle
 113         //
 114
 115         Bool_t bGenValues = kFALSE;
 116         Double_t vtx1[3] = {0,0,0};   // primary vertex
 117         Double_t vtx2daughter0[3] = {0,0,0};   // secondary vertex from daughter 0
 118         Double_t vtx2daughter1[3] = {0,0,0};   // secondary vertex from daughter 1
 119         fmcPartCandidate->XvYvZv(vtx1);  // cm
 120
 121         Int_t daughter0 = fmcPartCandidate->GetDaughter(0);
 122         Int_t daughter1 = fmcPartCandidate->GetDaughter(1);
 123         AliAODMCParticle* mcPartDaughter0 = dynamic_cast<AliAODMCParticle*>(fmcArray->At(daughter0));
 124         AliAODMCParticle* mcPartDaughter1 = dynamic_cast<AliAODMCParticle*>(fmcArray->At(daughter1));
 125         if(!mcPartDaughter0 || !mcPartDaughter1) return bGenValues;
 126
 127         // getting vertex from daughters
 128         mcPartDaughter0->XvYvZv(vtx2daughter0);  // cm
 129         mcPartDaughter1->XvYvZv(vtx2daughter1);  //cm
 130         if (TMath::Abs(vtx2daughter0[0] - vtx2daughter1[0]) > 1E-5 || TMath::Abs(vtx2daughter0[1] - vtx2daughter1[1]) > 1E-5 || TMath::Abs(vtx2daughter0[2] - vtx2daughter1[2])>1E-5) {
 131                 AliError("Daughters have different secondary vertex, skipping the track");
 132                 return bGenValues;
 133         }
 134
 135         Int_t nprongs = 2;
 136         Short_t charge = 0;
 137         // always instantiate the AliAODRecoDecay with the positive daughter first, the negative second
 138         AliAODMCParticle* positiveDaugh = mcPartDaughter0;
 139         AliAODMCParticle* negativeDaugh = mcPartDaughter1;
 140         if (mcPartDaughter0->GetPdgCode()<0 && mcPartDaughter1->GetPdgCode()>0){
 141                 // inverting in case the positive daughter is the second one
 142                 positiveDaugh = mcPartDaughter1;
 143                 negativeDaugh = mcPartDaughter0;
 144         }
 145         // getting the momentum from the daughters
 146         Double_t px[2] = {positiveDaugh->Px(), negativeDaugh->Px()};
 147         Double_t py[2] = {positiveDaugh->Py(), negativeDaugh->Py()};
 148         Double_t pz[2] = {positiveDaugh->Pz(), negativeDaugh->Pz()};
 149
 150         Double_t d0[2] = {0.,0.};
 151
 152         AliAODRecoDecayHF* decay = new AliAODRecoDecayHF(vtx1,vtx2daughter0,nprongs,charge,px,py,pz,d0);
 153
 154         Double_t cosThetaStar = 0.;
 155         Double_t cosThetaStarD0 = 0.;
 156         Double_t cosThetaStarD0bar = 0.;
 157         cosThetaStarD0 = decay->CosThetaStar(1,421,211,321);
 158         cosThetaStarD0bar = decay->CosThetaStar(0,421,321,211);
 159         if (fmcPartCandidate->GetPdgCode() == 421){  // D0
 160                 AliDebug(3, Form("D0, with pdgprong0 = %d, pdgprong1 = %d",mcPartDaughter0->GetPdgCode(),mcPartDaughter1->GetPdgCode()));
 161                 cosThetaStar = cosThetaStarD0;
 162         }
 163         else if (fmcPartCandidate->GetPdgCode() == -421){  // D0bar{
 164                 AliDebug(3, Form("D0bar, with pdgprong0 = %d, pdgprong1 = %d",mcPartDaughter0->GetPdgCode(),mcPartDaughter1->GetPdgCode()));
 165                 cosThetaStar = cosThetaStarD0bar;
 166         }
 167         else{
 168                 AliWarning("There are problems!! particle was expected to be either a D0 or a D0bar, check...");
 169                 return vectorMC;
 170         }
 171         if (cosThetaStar < -1 || cosThetaStar > 1) {
 172                 AliWarning("Invalid value for cosine Theta star, returning");
 173                 return bGenValues;
 174         }
 175
 176         //ct
 177         Double_t cT = decay->Ct(421);
 178         // get the pT of the daughters
 179         Double_t pTpi = 0.;
 180         Double_t pTK = 0.;
 181
 182         if (TMath::Abs(mcPartDaughter0->GetPdgCode()) == 211) {
 183                 pTpi = mcPartDaughter0->Pt();
 184                 pTK = mcPartDaughter1->Pt();
 185         }
 186         else {
 187                 pTpi = mcPartDaughter1->Pt();
 188                 pTK = mcPartDaughter0->Pt();
 189         }
 190
 191         vectorMC[0] = fmcPartCandidate->Pt();
 192         vectorMC[1] = fmcPartCandidate->Y() ;
 193         vectorMC[2] = cosThetaStar ;
 194         vectorMC[3] = pTpi ;
 195         vectorMC[4] = pTK ;
 196         vectorMC[5] = cT*1.E4 ;  // in micron
 197         vectorMC[6] = 0.;   // dummy value, meaningless in MC
 198         vectorMC[7] = 0.;   // dummy value, meaningless in MC, in micron
 199         vectorMC[8] = 0.;   // dummy value, meaningless in MC, in micron
 200         vectorMC[9] = -100000.; // dummy value, meaningless in MC, in micron^2
 201         vectorMC[10] = 1.01;    // dummy value, meaningless in MC
 202         vectorMC[11] = fmcPartCandidate->Phi();
 203         vectorMC[12] = fzMCVertex;    // z of reconstructed of primary vertex
 204         vectorMC[13] = fCentValue;   //reconstructed centrality
 205
 206         delete decay;
 207         bGenValues = kTRUE;
 208         return bGenValues;
 209 }
 210 //____________________________________________
 211 Bool_t AliCFVertexingHF2Prong::GetRecoValuesFromCandidate(Double_t *vectorReco) const
 212 {
 213         //
 214         // Getting the reconstructed values from the candidate
 215         //
 216
 217         Bool_t bFillRecoValues=kFALSE;
 218
 219         AliAODRecoDecayHF2Prong *d0toKpi = (AliAODRecoDecayHF2Prong*)fRecoCandidate;
 220
 221         if (d0toKpi->GetPrimaryVtx())AliDebug(3,"d0toKpi has primary vtx\n");
 222         if (fRecoCandidate->GetPrimaryVtx())AliDebug(3,"fRecoCandidate has primary vtx\n");
 223
 224         Double_t pt = d0toKpi->Pt();
 225         Double_t rapidity = d0toKpi->YD0();
 226         Double_t invMass=0.;
 227         Double_t cosThetaStar = 9999.;
 228         Double_t pTpi = 0.;
 229         Double_t pTK = 0.;
 230         Double_t dca = d0toKpi->GetDCA();
 231         Double_t d0pi = 0.;
 232         Double_t d0K = 0.;
 233         Double_t d0xd0 = d0toKpi->Prodd0d0();
 234         Double_t cosPointingAngle = d0toKpi->CosPointingAngle();
 235         Double_t phi = d0toKpi->Phi();
 236         Int_t pdgCode = fmcPartCandidate->GetPdgCode();
 237
 238         if (pdgCode > 0){
 239                 cosThetaStar = d0toKpi->CosThetaStarD0();
 240                 pTpi = d0toKpi->PtProng(0);
 241                 pTK = d0toKpi->PtProng(1);
 242                 d0pi = d0toKpi->Getd0Prong(0);
 243                 d0K = d0toKpi->Getd0Prong(1);
 244                 invMass=d0toKpi->InvMassD0();
 245         }
 246         else {
 247                 cosThetaStar = d0toKpi->CosThetaStarD0bar();
 248                 pTpi = d0toKpi->PtProng(1);
 249                 pTK = d0toKpi->PtProng(0);
 250                 d0pi = d0toKpi->Getd0Prong(1);
 251                 d0K = d0toKpi->Getd0Prong(0);
 252                 invMass= d0toKpi->InvMassD0bar();
 253         }
 254
 255         Double_t cT = d0toKpi->CtD0();
 256
 257         vectorReco[0] = pt;
 258         vectorReco[1] = rapidity;
 259         vectorReco[2] = cosThetaStar;
 260         vectorReco[3] = pTpi;
 261         vectorReco[4] = pTK;
 262         vectorReco[5] = cT*1.E4;  // in micron
 263         vectorReco[6] = dca*1.E4;  // in micron
 264         vectorReco[7] = d0pi*1.E4;  // in micron
 265         vectorReco[8] = d0K*1.E4;  // in micron
 266         vectorReco[9] = d0xd0*1.E8;  // in micron^2
 267         vectorReco[10] = cosPointingAngle;  // in micron
 268         vectorReco[11] = phi;
 269         vectorReco[12] = fzPrimVertex;    // z of reconstructed of primary vertex
 270         vectorReco[13] = fCentValue; //reconstructed centrality
 271
 272         bFillRecoValues = kTRUE;
 273
 274         return bFillRecoValues;
 275 }
 276
 277 //_____________________________________________________________
 278 Bool_t AliCFVertexingHF2Prong::CheckMCChannelDecay() const
 279 {
 280         //
 281         // checking the MC decay channel
 282         //
 283         Bool_t checkCD = kFALSE;
 284         Int_t daughter0 = fmcPartCandidate->GetDaughter(0);
 285         Int_t daughter1 = fmcPartCandidate->GetDaughter(1);
 286         AliAODMCParticle* mcPartDaughter0 = dynamic_cast<AliAODMCParticle*>(fmcArray->At(daughter0));
 287         AliAODMCParticle* mcPartDaughter1 = dynamic_cast<AliAODMCParticle*>(fmcArray->At(daughter1));
 288
 289         if (!mcPartDaughter0 || !mcPartDaughter1) {
 290                 AliDebug (2,"Problems in the MC Daughters\n");
 291                 return checkCD;
 292         }
 293
 294         if (!(TMath::Abs(mcPartDaughter0->GetPdgCode())==321 &&
 295               TMath::Abs(mcPartDaughter1->GetPdgCode())==211) &&
 296             !(TMath::Abs(mcPartDaughter0->GetPdgCode())==211 &&
 297               TMath::Abs(mcPartDaughter1->GetPdgCode())==321)) {
 298                 AliDebug(2, "The D0 MC doesn't come from a Kpi decay, skipping!!");
 299                 return checkCD;
 300         }
 301
 302         checkCD = kTRUE;
 303         return checkCD;
 304
 305 }
 306