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
  51   AliLog::SetClassDebugLevel("AliEbyEPidRatioDCA",10);
  52 }
  53
  54 //________________________________________________________________________
  55 AliEbyEPidRatioDCA::~AliEbyEPidRatioDCA() {
  56   // Destructor
  57 }
  58
  59 //________________________________________________________________________
  60 void AliEbyEPidRatioDCA::Process() {
  61    Float_t etaRange[2];
  62   fESDTrackCutsBkg->GetEtaRange(etaRange[0],etaRange[1]);
  63
  64   Float_t ptRange[2];
  65   fESDTrackCutsBkg->GetPtRange(ptRange[0],ptRange[1]);
  66
  67   // -- Track Loop
  68   for (Int_t idxTrack = 0; idxTrack < fNTracks; ++idxTrack) {
  69
  70     AliVTrack *track = (fESD) ? static_cast<AliVTrack*>(fESD->GetTrack(idxTrack)) : static_cast<AliVTrack*>(fAOD->GetTrack(idxTrack));
  71
  72     // -- Check if track is accepted for basic parameters
  73     if (!fHelper->IsTrackAcceptedBasicCharged(track))
  74       continue;
  75
  76     // -- Check if accepted - ESD
  77     if (fESD && !fESDTrackCutsBkg->AcceptTrack(dynamic_cast<AliESDtrack*>(track)))
  78       continue;
  79
  80     // -- Check if accepted - AOD
  81     if (fAOD){
  82       AliAODTrack * trackAOD = dynamic_cast<AliAODTrack*>(track);
  83
  84       if (!trackAOD) {
  85         AliError("Pointer to dynamic_cast<AliAODTrack*>(track) = ZERO");
  86         continue;
  87       }
  88       if (!trackAOD->TestFilterBit(fAODtrackCutBit))
  89         continue;
  90
  91       // -- Check if in pT and eta range (is done in ESDTrackCuts for ESDs)
  92       if(!(track->Pt() > ptRange[0] && track->Pt() <= ptRange[1] && TMath::Abs(track->Eta()) <= etaRange[1]))
  93         continue;
  94     }
  95
  96     Int_t gPdgCode = 0;
  97     Int_t iPid = 0;
  98     Double_t pid[3];
  99     if      (fHelper->IsTrackAcceptedPID(track, pid, (AliPID::kPion)))  {  iPid = 1; gPdgCode = 211;}
 100     else if (fHelper->IsTrackAcceptedPID(track, pid, (AliPID::kKaon)))  {  iPid = 2; gPdgCode = 321;}
 101     else if (fHelper->IsTrackAcceptedPID(track, pid, (AliPID::kProton))){  iPid = 3; gPdgCode = 2212;}
 102     else { iPid = 0; gPdgCode = 0;}
 103
 104     //  cout << " --- DCA ---- " << iPid << "  " << gPdgCode << endl;
 105     Double_t yP;
 106     if (!fHelper->IsTrackAcceptedRapidity(track, yP, iPid))
 107       continue;
 108
 109     Bool_t isDCArAccepted = fHelper->IsTrackAcceptedDCA(track);
 110
 111     // -- Check if accepted with thighter DCA cuts
 112     // ?!?!? How to mimic this in AODs?
 113     if (fESD && !fESDTrackCuts->AcceptTrack(dynamic_cast<AliESDtrack*>(track)))
 114       isDCArAccepted = kFALSE;
 115
 116     // -- Check for contamination
 117     Int_t contIdx = (fIsMC) ? GetContIdxTrack(TMath::Abs(track->GetLabel()), track->Charge(), gPdgCode) : 1;
 118
 119     // -- Get DCAs (dca_r, dca_z, sigma_xy, sigma_xy_z, sigma_z)
 120     Float_t dca[2], cov[3]; //
 121     if (fESD)
 122       (dynamic_cast<AliESDtrack*>(track))->GetImpactParameters(dca, cov);
 123     else
 124       dca[0] = 1.;
 125
 126     // -- Fill THnSparse
 127
 128     if(iPid != 0) {
 129       Double_t hnDCA[10] = {fCentralityBin,0,  track->Charge(),
 130                             track->Eta(),
 131                             yP,
 132                             track->Phi(),
 133                             track->Pt(),
 134                             contIdx,
 135                             isDCArAccepted,
 136                             dca[0]};
 137       fHnDCA->Fill(hnDCA);
 138     }
 139
 140     Double_t hnDCA[10] = {fCentralityBin, iPid, track->Charge(),
 141                           track->Eta(),
 142                           yP,
 143                           track->Phi(),
 144                           track->Pt(),
 145                           contIdx,
 146                           isDCArAccepted,
 147                           dca[0]};
 148       fHnDCA->Fill(hnDCA);
 149
 150
 151     } // for (Int_t idxTrack = 0; idxTrack < fNTracks; ++idxTrack) {
 152
 153   return;
 154 }
 155
 156 //________________________________________________________________________
 157 void AliEbyEPidRatioDCA::CreateHistograms() {
 158   Int_t    binHnDCA[10] = {AliEbyEPidRatioHelper::fgkfHistNBinsCent,4,
 159                            AliEbyEPidRatioHelper::fgkfHistNBinsSign,
 160                            AliEbyEPidRatioHelper::fgkfHistNBinsEta,
 161                            AliEbyEPidRatioHelper::fgkfHistNBinsRap,
 162                            AliEbyEPidRatioHelper::fgkfHistNBinsPhi,
 163                            AliEbyEPidRatioHelper::fgkfHistNBinsPt,
 164                            4,  2,  77};
 165
 166   Double_t minHnDCA[10] = {AliEbyEPidRatioHelper::fgkfHistRangeCent[0],-0.5,
 167                            AliEbyEPidRatioHelper::fgkfHistRangeSign[0],
 168                            AliEbyEPidRatioHelper::fgkfHistRangeEta[0],
 169                            AliEbyEPidRatioHelper::fgkfHistRangeRap[0],
 170                            AliEbyEPidRatioHelper::fgkfHistRangePhi[0],
 171                            AliEbyEPidRatioHelper::fgkfHistRangePt[0],
 172                            0.5, -0.5, -3.};
 173
 174   Double_t maxHnDCA[10] = {AliEbyEPidRatioHelper::fgkfHistRangeCent[1],3.5,
 175                            AliEbyEPidRatioHelper::fgkfHistRangeSign[1],
 176                            AliEbyEPidRatioHelper::fgkfHistRangeEta[1],
 177                            AliEbyEPidRatioHelper::fgkfHistRangeRap[1],
 178                            AliEbyEPidRatioHelper::fgkfHistRangePhi[1],
 179                            AliEbyEPidRatioHelper::fgkfHistRangePt[1],
 180                            4.5, 1.5, 3.};
 181
 182
 183   fHnDCA = new THnSparseD("hnDCA", "cent:pid:etaRec:yRec:phiRec:ptRec:sign:contPart:contSign:DCArAccepted:DCAr", 10, binHnDCA, minHnDCA, maxHnDCA);
 184
 185   fHnDCA->Sumw2();
 186
 187   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
 188   fHnDCA->GetAxis(1)->SetTitle("N_{ch}|N_{#pi}|N_{K}|N_{p}");   //  0 | 1 | 2 | 3
 189   fHnDCA->GetAxis(2)->SetTitle("sign");                         //  -1 | 0 | +1
 190   fHnDCA->GetAxis(3)->SetTitle("#eta_{Rec}");                   //  eta  [-0.9, 0.9]
 191   fHnDCA->GetAxis(4)->SetTitle("#it{y}_{Rec}");                 //  rapidity  [-0.5, 0.5]
 192   fHnDCA->GetAxis(5)->SetTitle("#varphi_{Rec} (rad)");          //  phi  [ 0. , 2Pi]
 193   fHnDCA->GetAxis(6)->SetTitle("#it{p}_{T,Rec} (GeV/#it{c})");  //  pT   [ 0.2, 2.6]
 194   fHnDCA->GetAxis(7)->SetTitle("contPart");                     //  1  primary | 2 missId | 3 from WeakDecay | 4 p from Material
 195   fHnDCA->GetAxis(8)->SetTitle("DCArAccepted");                 //  0 not accepted | 1 accepted
 196   fHnDCA->GetAxis(9)->SetTitle("DCAr");                         //  DCAr [-3, 3]
 197
 198
 199   fHelper->BinLogAxis(fHnDCA,  6, fESDTrackCuts);
 200   fHelper->BinLogAxis(fHnDCA,  6, fESDTrackCutsBkg);
 201
 202   // -- Set binning for DCAr
 203   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.};
 204   fHnDCA->GetAxis(9)->Set(76, binsDCAr);
 205
 206   // ------------------------------------------------------------------
 207
 208   return;
 209 }
 210
 211 //________________________________________________________________________
 212 Int_t AliEbyEPidRatioDCA::GetContIdxTrack(Int_t label, Int_t sign, Int_t gPdgCode) {
 213   Int_t contIdx = -1;
 214
 215   AliVParticle* particle = (fESD) ? fMCEvent->GetTrack(label) : static_cast<AliVParticle*>(fArrayMC->At(label));
 216   if (!particle)
 217     return contIdx;
 218
 219   Bool_t isPhysicalPrimary        = (fESD) ? fStack->IsPhysicalPrimary(label): (static_cast<AliAODMCParticle*>(particle))->IsPhysicalPrimary();
 220   Bool_t isSecondaryFromWeakDecay = (fESD) ? fStack->IsSecondaryFromWeakDecay(label) : (static_cast<AliAODMCParticle*>(particle))->IsSecondaryFromWeakDecay();
 221   Bool_t isSecondaryFromMaterial  = (fESD) ? fStack->IsSecondaryFromMaterial(label)  : (static_cast<AliAODMCParticle*>(particle))->IsSecondaryFromMaterial();
 222
 223   if (isPhysicalPrimary) {
 224     if (gPdgCode == 0) {
 225       // -- Check if correctly identified
 226       if (particle->PdgCode() == (sign*gPdgCode))
 227         contIdx = 1;
 228       // -- MissIdentification
 229       else
 230         contIdx = 2;
 231     }
 232     else
 233       contIdx = 1;
 234   }
 235
 236   // -- Check if secondaries from material or weak decay
 237   else if(isSecondaryFromWeakDecay)
 238     contIdx = 3;
 239   else if (isSecondaryFromMaterial)
 240     contIdx = 4;
 241   else
 242     contIdx = -1;
 243
 244   return contIdx;
 245 }
 246
 247
 248