PWGCF/EBYE/PIDFluctuation/task/AliEbyEPidRatioDCA.cxx

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  15
  16
  17 //=========================================================================//
  18 //             AliEbyE Analysis for Particle Ratio Fluctuation             //
  19 //                   Deepika Rathee  | Satyajit Jena                       //
  20 //                   drathee@cern.ch | sjena@cern.ch                       //
  21 //                  Date: Wed Jul  9 18:38:30 CEST 2014                    //
  22 //          New approch to find particle ratio to reduce memory            //
  23 //                             (Test Only)                                 //
  24 //=========================================================================//
  25
  26 #include "TMath.h"
  27 #include "TAxis.h"
  28
  29 #include "AliESDEvent.h"
  30 #include "AliStack.h"
  31 #include "AliMCEvent.h"
  32 #include "AliESDtrackCuts.h"
  33
  34 #include "AliAODEvent.h"
  35 #include "AliAODMCParticle.h"
  36
  37 #include "AliEbyEPidRatioDCA.h"
  38
  39 using namespace std;
  40
  41 ClassImp(AliEbyEPidRatioDCA)
  42
  43 //________________________________________________________________________
  44 AliEbyEPidRatioDCA::AliEbyEPidRatioDCA() :
  45   AliEbyEPidRatioBase("DCA", "DCA"),
  46   fESDTrackCutsBkg(NULL),
  47   fHnDCA(NULL) {
  48   // Constructor
  49
  50   AliLog::SetClassDebugLevel("AliEbyEPidRatioDCA",10);
  51 }
  52
  53 //________________________________________________________________________
  54 AliEbyEPidRatioDCA::~AliEbyEPidRatioDCA() {
  55   // Destructor
  56 }
  57
  58 //________________________________________________________________________
  59 void AliEbyEPidRatioDCA::Process() {
  60    Float_t etaRange[2];
  61   fESDTrackCutsBkg->GetEtaRange(etaRange[0],etaRange[1]);
  62
  63   Float_t ptRange[2];
  64   fESDTrackCutsBkg->GetPtRange(ptRange[0],ptRange[1]);
  65
  66   // -- Track Loop
  67   for (Int_t idxTrack = 0; idxTrack < fNTracks; ++idxTrack) {
  68
  69     AliVTrack *track = (fESD) ? static_cast<AliVTrack*>(fESD->GetTrack(idxTrack)) : static_cast<AliVTrack*>(fAOD->GetTrack(idxTrack));
  70
  71     // -- Check if track is accepted for basic parameters
  72     if (!fHelper->IsTrackAcceptedBasicCharged(track))
  73       continue;
  74
  75     // -- Check if accepted - ESD
  76     if (fESD && !fESDTrackCutsBkg->AcceptTrack(dynamic_cast<AliESDtrack*>(track)))
  77       continue;
  78
  79     // -- Check if accepted - AOD
  80     if (fAOD){
  81       AliAODTrack * trackAOD = dynamic_cast<AliAODTrack*>(track);
  82
  83       if (!trackAOD) {
  84         AliError("Pointer to dynamic_cast<AliAODTrack*>(track) = ZERO");
  85         continue;
  86       }
  87       if (!trackAOD->TestFilterBit(fAODtrackCutBit))
  88         continue;
  89
  90       // -- Check if in pT and eta range (is done in ESDTrackCuts for ESDs)
  91       if(!(track->Pt() > ptRange[0] && track->Pt() <= ptRange[1] && TMath::Abs(track->Eta()) <= etaRange[1]))
  92         continue;
  93     }
  94
  95     Int_t gPdgCode = 0;
  96     Int_t iPid = 0;
  97     Double_t pid[3];
  98     if      (fHelper->IsTrackAcceptedPID(track, pid, (AliPID::kPion)))  {  iPid = 1; gPdgCode = 211;}
  99     else if (fHelper->IsTrackAcceptedPID(track, pid, (AliPID::kKaon)))  {  iPid = 2; gPdgCode = 321;}
 100     else if (fHelper->IsTrackAcceptedPID(track, pid, (AliPID::kProton))){  iPid = 3; gPdgCode = 2212;}
 101     else { iPid = 0; gPdgCode = 0;}
 102
 103     //  cout << " --- DCA ---- " << iPid << "  " << gPdgCode << endl;
 104     Double_t yP;
 105     if (!fHelper->IsTrackAcceptedRapidity(track, yP, iPid))
 106       continue;
 107
 108     Bool_t isDCArAccepted = fHelper->IsTrackAcceptedDCA(track);
 109
 110     // -- Check if accepted with thighter DCA cuts
 111     // ?!?!? How to mimic this in AODs?
 112     if (fESD && !fESDTrackCuts->AcceptTrack(dynamic_cast<AliESDtrack*>(track)))
 113       isDCArAccepted = kFALSE;
 114
 115     // -- Check for contamination
 116     Int_t contIdx = (fIsMC) ? GetContIdxTrack(TMath::Abs(track->GetLabel()), track->Charge(), gPdgCode) : 1;
 117
 118     // -- Get DCAs (dca_r, dca_z, sigma_xy, sigma_xy_z, sigma_z)
 119     Float_t dca[2], cov[3]; //
 120     if (fESD)
 121       (dynamic_cast<AliESDtrack*>(track))->GetImpactParameters(dca, cov);
 122     else
 123       dca[0] = 1.;
 124
 125     // -- Fill THnSparse
 126
 127     if(iPid != 0) {
 128       Double_t hnDCA[10] = {fCentralityBin,0,  track->Charge(),
 129                             track->Eta(),
 130                             yP,
 131                             track->Phi(),
 132                             track->Pt(),
 133                             contIdx,
 134                             isDCArAccepted,
 135                             dca[0]};
 136       fHnDCA->Fill(hnDCA);
 137     }
 138
 139     Double_t hnDCA[10] = {fCentralityBin, iPid, track->Charge(),
 140                           track->Eta(),
 141                           yP,
 142                           track->Phi(),
 143                           track->Pt(),
 144                           contIdx,
 145                           isDCArAccepted,
 146                           dca[0]};
 147       fHnDCA->Fill(hnDCA);
 148
 149
 150     } // for (Int_t idxTrack = 0; idxTrack < fNTracks; ++idxTrack) {
 151
 152   return;
 153 }
 154
 155 //________________________________________________________________________
 156 void AliEbyEPidRatioDCA::CreateHistograms() {
 157   Int_t    binHnDCA[10] = {AliEbyEPidRatioHelper::fgkfHistNBinsCent,4,
 158                            AliEbyEPidRatioHelper::fgkfHistNBinsSign,
 159                            AliEbyEPidRatioHelper::fgkfHistNBinsEta,
 160                            AliEbyEPidRatioHelper::fgkfHistNBinsRap,
 161                            AliEbyEPidRatioHelper::fgkfHistNBinsPhi,
 162                            AliEbyEPidRatioHelper::fgkfHistNBinsPt,
 163                            4,  2,  77};
 164
 165   Double_t minHnDCA[10] = {AliEbyEPidRatioHelper::fgkfHistRangeCent[0],-0.5,
 166                            AliEbyEPidRatioHelper::fgkfHistRangeSign[0],
 167                            AliEbyEPidRatioHelper::fgkfHistRangeEta[0],
 168                            AliEbyEPidRatioHelper::fgkfHistRangeRap[0],
 169                            AliEbyEPidRatioHelper::fgkfHistRangePhi[0],
 170                            AliEbyEPidRatioHelper::fgkfHistRangePt[0],
 171                            0.5, -0.5, -3.};
 172
 173   Double_t maxHnDCA[10] = {AliEbyEPidRatioHelper::fgkfHistRangeCent[1],3.5,
 174                            AliEbyEPidRatioHelper::fgkfHistRangeSign[1],
 175                            AliEbyEPidRatioHelper::fgkfHistRangeEta[1],
 176                            AliEbyEPidRatioHelper::fgkfHistRangeRap[1],
 177                            AliEbyEPidRatioHelper::fgkfHistRangePhi[1],
 178                            AliEbyEPidRatioHelper::fgkfHistRangePt[1],
 179                            4.5, 1.5, 3.};
 180
 181
 182   fHnDCA = new THnSparseD("hnDCA", "cent:pid:etaRec:yRec:phiRec:ptRec:sign:contPart:contSign:DCArAccepted:DCAr", 10, binHnDCA, minHnDCA, maxHnDCA);
 183
 184   fHnDCA->Sumw2();
 185
 186   fHnDCA->GetAxis(0)->SetTitle("centrality");                   //  0-5|5-10|10-20|20-30|30-40|40-50|50-60|60-70|70-80|80-90 --> 10 bins
 187   fHnDCA->GetAxis(1)->SetTitle("N_{ch}|N_{#pi}|N_{K}|N_{p}");   //  0 | 1 | 2 | 3
 188   fHnDCA->GetAxis(2)->SetTitle("sign");                         //  -1 | 0 | +1
 189   fHnDCA->GetAxis(3)->SetTitle("#eta_{Rec}");                   //  eta  [-0.9, 0.9]
 190   fHnDCA->GetAxis(4)->SetTitle("#it{y}_{Rec}");                 //  rapidity  [-0.5, 0.5]
 191   fHnDCA->GetAxis(5)->SetTitle("#varphi_{Rec} (rad)");          //  phi  [ 0. , 2Pi]
 192   fHnDCA->GetAxis(6)->SetTitle("#it{p}_{T,Rec} (GeV/#it{c})");  //  pT   [ 0.2, 2.6]
 193   fHnDCA->GetAxis(7)->SetTitle("contPart");                     //  1  primary | 2 missId | 3 from WeakDecay | 4 p from Material
 194   fHnDCA->GetAxis(8)->SetTitle("DCArAccepted");                 //  0 not accepted | 1 accepted
 195   fHnDCA->GetAxis(9)->SetTitle("DCAr");                         //  DCAr [-3, 3]
 196
 197
 198   fHelper->BinLogAxis(fHnDCA,  6, fESDTrackCuts);
 199   fHelper->BinLogAxis(fHnDCA,  6, fESDTrackCutsBkg);
 200
 201   // -- Set binning for DCAr
 202   Double_t binsDCAr[77] = {-3.,-2.85,-2.7,-2.55,-2.4,-2.25,-2.1,-1.95,-1.8,-1.65,-1.5,-1.35,-1.2,-1.05,-0.9,-0.75,-0.6,-0.45,-0.3,-0.285,-0.27,-0.255,-0.24,-0.225,-0.21,-0.195,-0.18,-0.165,-0.15,-0.135,-0.12,-0.105,-0.09,-0.075,-0.06,-0.045,-0.03,-0.015,0.,0.015,0.03,0.045,0.06,0.075,0.09,0.105,0.12,0.135,0.15,0.165,0.18,0.195,0.21,0.225,0.24,0.255,0.27,0.285,0.3,0.45,0.6,0.75,0.9,1.05,1.2,1.35,1.5,1.65,1.8,1.95,2.1,2.25,2.4,2.55,2.7,2.85,3.};
 203   fHnDCA->GetAxis(9)->Set(76, binsDCAr);
 204
 205   // ------------------------------------------------------------------
 206
 207   return;
 208 }
 209
 210 //________________________________________________________________________
 211 Int_t AliEbyEPidRatioDCA::GetContIdxTrack(Int_t label, Int_t sign, Int_t gPdgCode) {
 212   Int_t contIdx = -1;
 213
 214   AliVParticle* particle = (fESD) ? fMCEvent->GetTrack(label) : static_cast<AliVParticle*>(fArrayMC->At(label));
 215   if (!particle)
 216     return contIdx;
 217
 218   Bool_t isPhysicalPrimary        = (fESD) ? fStack->IsPhysicalPrimary(label): (static_cast<AliAODMCParticle*>(particle))->IsPhysicalPrimary();
 219   Bool_t isSecondaryFromWeakDecay = (fESD) ? fStack->IsSecondaryFromWeakDecay(label) : (static_cast<AliAODMCParticle*>(particle))->IsSecondaryFromWeakDecay();
 220   Bool_t isSecondaryFromMaterial  = (fESD) ? fStack->IsSecondaryFromMaterial(label)  : (static_cast<AliAODMCParticle*>(particle))->IsSecondaryFromMaterial();
 221
 222   if (isPhysicalPrimary) {
 223     if (gPdgCode == 0) {
 224       // -- Check if correctly identified
 225       if (particle->PdgCode() == (sign*gPdgCode))
 226         contIdx = 1;
 227       // -- MissIdentification
 228       else
 229         contIdx = 2;
 230     }
 231     else
 232       contIdx = 1;
 233   }
 234
 235   // -- Check if secondaries from material or weak decay
 236   else if(isSecondaryFromWeakDecay)
 237     contIdx = 3;
 238   else if (isSecondaryFromMaterial)
 239     contIdx = 4;
 240   else
 241     contIdx = -1;
 242
 243   return contIdx;
 244 }
 245
 246
 247