PWG3/vertexingHF/AliCFHeavyFlavourTaskMultiVar.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-2009, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
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  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
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  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16 //-----------------------------------------------------------------------
  17 // Class for HF corrections as a function of many variables
  18 //
  19 // Example of task running on AliEn
  20 // which provides standard way of calculating acceptance and efficiency
  21 // between different steps of the procedure.
  22 // The ouptut of the task is a AliCFContainer from which the efficiencies
  23 // can be calculated
  24 //-----------------------------------------------------------------------
  25 // Author : C. Zampolli, CERN, on the basis of R. Vernet's example
  26 //-----------------------------------------------------------------------
  27
  28 #include <TCanvas.h>
  29 #include <TParticle.h>
  30 #include <TH1I.h>
  31 #include <TStyle.h>
  32
  33 #include "AliCFHeavyFlavourTaskMultiVar.h"
  34 #include "AliStack.h"
  35 #include "AliMCEvent.h"
  36 #include "AliCFManager.h"
  37 #include "AliCFContainer.h"
  38 #include "AliLog.h"
  39 #include "AliAODEvent.h"
  40 #include "AliAODRecoDecay.h"
  41 #include "AliAODRecoDecayHF.h"
  42 #include "AliAODRecoDecayHF2Prong.h"
  43 #include "AliAODMCParticle.h"
  44
  45 //__________________________________________________________________________
  46 AliCFHeavyFlavourTaskMultiVar::AliCFHeavyFlavourTaskMultiVar() :
  47         AliAnalysisTaskSE(),
  48         fPDG(0),
  49         fCFManager(0x0),
  50         fHistEventsProcessed(0x0),
  51         fCountMC(0),
  52         fEvents(0),
  53         fFillFromGenerated(kFALSE)
  54 {
  55         //
  56         //Default ctor
  57         //
  58 }
  59 //___________________________________________________________________________
  60 AliCFHeavyFlavourTaskMultiVar::AliCFHeavyFlavourTaskMultiVar(const Char_t* name) :
  61         AliAnalysisTaskSE(name),
  62         fPDG(0),
  63         fCFManager(0x0),
  64         fHistEventsProcessed(0x0),
  65         fCountMC(0),
  66         fEvents(0),
  67         fFillFromGenerated(kFALSE)
  68 {
  69         //
  70         // Constructor. Initialization of Inputs and Outputs
  71         //
  72         Info("AliCFHeavyFlavourTaskMultiVar","Calling Constructor");
  73         /*
  74           DefineInput(0) and DefineOutput(0)
  75           are taken care of by AliAnalysisTaskSE constructor
  76         */
  77         DefineOutput(1,TH1I::Class());
  78         DefineOutput(2,AliCFContainer::Class());
  79 }
  80
  81 //___________________________________________________________________________
  82 AliCFHeavyFlavourTaskMultiVar& AliCFHeavyFlavourTaskMultiVar::operator=(const AliCFHeavyFlavourTaskMultiVar& c)
  83 {
  84         //
  85         // Assignment operator
  86         //
  87         if (this!=&c) {
  88                 AliAnalysisTaskSE::operator=(c) ;
  89                 fPDG      = c.fPDG;
  90                 fCFManager  = c.fCFManager;
  91                 fHistEventsProcessed = c.fHistEventsProcessed;
  92         }
  93         return *this;
  94 }
  95
  96 //___________________________________________________________________________
  97 AliCFHeavyFlavourTaskMultiVar::AliCFHeavyFlavourTaskMultiVar(const AliCFHeavyFlavourTaskMultiVar& c) :
  98         AliAnalysisTaskSE(c),
  99         fPDG(c.fPDG),
 100         fCFManager(c.fCFManager),
 101         fHistEventsProcessed(c.fHistEventsProcessed),
 102         fCountMC(c.fCountMC),
 103         fEvents(c.fEvents),
 104         fFillFromGenerated(c.fFillFromGenerated)
 105 {
 106         //
 107         // Copy Constructor
 108         //
 109 }
 110
 111 //___________________________________________________________________________
 112 AliCFHeavyFlavourTaskMultiVar::~AliCFHeavyFlavourTaskMultiVar() {
 113         //
 114         //destructor
 115         //
 116         Info("~AliCFHeavyFlavourTaskMultiVar","Calling Destructor");
 117         if (fCFManager)           delete fCFManager ;
 118         if (fHistEventsProcessed) delete fHistEventsProcessed ;
 119 }
 120
 121 //_________________________________________________
 122 void AliCFHeavyFlavourTaskMultiVar::UserExec(Option_t *)
 123 {
 124         //
 125         // Main loop function
 126         //
 127
 128         if (!fInputEvent) {
 129                 Error("UserExec","NO EVENT FOUND!");
 130                 return;
 131         }
 132
 133         fEvents++;
 134         if (fEvents%10000 ==0) AliInfo(Form("Event %d",fEvents));
 135         AliAODEvent* aodEvent = dynamic_cast<AliAODEvent*>(fInputEvent);
 136         fCFManager->SetEventInfo(aodEvent);
 137
 138         // MC-event selection
 139         Double_t containerInput[6] ;
 140
 141         //loop on the MC event
 142
 143         TClonesArray* mcArray = dynamic_cast<TClonesArray*>(aodEvent->FindListObject(AliAODMCParticle::StdBranchName()));
 144         if (!mcArray) AliError("Could not find Monte-Carlo in AOD");
 145         Int_t icountMC = 0;
 146
 147         for (Int_t iPart=0; iPart<mcArray->GetEntriesFast(); iPart++) {
 148                 AliAODMCParticle* mcPart = dynamic_cast<AliAODMCParticle*>(mcArray->At(iPart));
 149                 if (!mcPart) {
 150                         AliWarning("Particle not found in tree, skipping");
 151                         continue;
 152                 }
 153
 154                 // check the MC-level cuts
 155                 if (!fCFManager->CheckParticleCuts(0, mcPart)) continue;  // 0 stands for MC level
 156
 157                 // fill the container for Gen-level selection
 158                 Double_t vectorMC[6] = {9999.,9999.,9999.,9999.,9999.,9999.};
 159                 if (GetGeneratedValuesFromMCParticle(mcPart, mcArray, vectorMC)){
 160                         containerInput[0] = vectorMC[0];
 161                         containerInput[1] = vectorMC[1] ;
 162                         containerInput[2] = vectorMC[2] ;
 163                         containerInput[3] = vectorMC[3] ;
 164                         containerInput[4] = vectorMC[4] ;
 165                         containerInput[5] = vectorMC[5] ;  // in micron
 166                         fCFManager->GetParticleContainer()->Fill(containerInput,kStepGenerated);
 167                         icountMC++;
 168                 }
 169                 else {
 170                         AliDebug(3,"Problems in filling the container");
 171                         continue;
 172                 }
 173         }
 174
 175         AliDebug(2, Form("Found %i MC particles that are D0!!",icountMC));
 176         AliDebug(2, Form("aodEvent = %p ",aodEvent));
 177
 178         // Now go to rec level
 179         fCountMC += icountMC;
 180         // load heavy flavour vertices
 181
 182         TClonesArray *arrayVerticesHF = (TClonesArray*)((aodEvent->GetList())->FindObject("D0toKpi"));
 183         if (!arrayVerticesHF) AliError("Could not find array of HF vertices");
 184         AliDebug(2, Form("Found %d vertices",arrayVerticesHF->GetEntriesFast()));
 185
 186         for (Int_t iVertex = 0; iVertex<arrayVerticesHF->GetEntriesFast(); iVertex++) {
 187
 188                 AliAODRecoDecayHF2Prong* vtx = (AliAODRecoDecayHF2Prong*)arrayVerticesHF->At(iVertex);
 189
 190                 // cuts can't be applied to RecoDecays particles
 191                 // if (!fCFManager->CheckParticleCuts(1  , vtx)) continue;  // 1 stands for AOD level
 192
 193                 // find associated MC particle
 194                 Int_t mcLabel = vtx->MatchToMC(421,mcArray) ;
 195                 if (mcLabel == -1)
 196                         {
 197                                 AliDebug(2,"No MC particle found");
 198                         }
 199                 else {
 200                         AliAODMCParticle* mcVtxHF = (AliAODMCParticle*)mcArray->At(mcLabel);
 201                         if (!mcVtxHF) {
 202                                 AliWarning("Could not find associated MC in AOD MC tree");
 203                                 continue;
 204                         }
 205
 206                         // check if associated MC v0 passes the cuts
 207                         if (!fCFManager->CheckParticleCuts(0 ,mcVtxHF)) {  // 0 stands for MC
 208                                 AliDebug(2, "Skipping the particles due to cuts");
 209                                 continue;
 210                         }
 211
 212                         // fill the container
 213                         // either with reconstructed values....
 214                         Double_t pt = vtx->Pt();
 215                         Double_t rapidity = vtx->YD0();
 216
 217                         Double_t cosThetaStar = 9999.;
 218                         Double_t pTpi = 0.;
 219                         Double_t pTK = 0.;
 220                         Int_t pdgCode = mcVtxHF->GetPdgCode();
 221                         if (pdgCode > 0){
 222                                 cosThetaStar = vtx->CosThetaStarD0();
 223                                 pTpi = vtx->PtProng(0);
 224                                 pTK = vtx->PtProng(1);
 225                         }
 226                         else {
 227                                 cosThetaStar = vtx->CosThetaStarD0bar();
 228                                 pTpi = vtx->PtProng(1);
 229                                 pTK = vtx->PtProng(0);
 230                         }
 231
 232                         Double_t cT = vtx->CtD0();
 233                         AliDebug(2, Form("cT from reconstructed vertex = %f (micron)",cT*1E4));
 234                         AliDebug(2, Form("pdg code from MC = %d",TMath::Abs(mcVtxHF->GetPdgCode())));
 235
 236                         // ... or with generated values
 237
 238                         if (!fFillFromGenerated){
 239                                 containerInput[0] = pt;
 240                                 containerInput[1] = rapidity;
 241                                 containerInput[2] = cosThetaStar;
 242                                 containerInput[3] = pTpi;
 243                                 containerInput[4] = pTK;
 244                                 containerInput[5] = cT*1.E4;  // in micron
 245                         }
 246                         else {
 247                                 Double_t vectorMC[6] = {9999.,9999.,9999.,9999.,9999.,9999.};
 248                                 if (GetGeneratedValuesFromMCParticle(mcVtxHF, mcArray, vectorMC)){
 249                                         containerInput[0] = vectorMC[0];
 250                                         containerInput[1] = vectorMC[1] ;
 251                                         containerInput[2] = vectorMC[2] ;
 252                                         containerInput[3] = vectorMC[3] ;
 253                                         containerInput[4] = vectorMC[4] ;
 254                                         containerInput[5] = vectorMC[5] ;  // in micron
 255                                 }
 256                                 else {
 257                                         AliDebug(3,"Problems in filling the container");
 258                                         continue;
 259                                 }
 260                         }
 261                         AliDebug(2, Form("Filling the container with pt = %f, rapidity = %f, cosThetaStar = %f, pTpi = %f, pTK = %f, cT = %f", containerInput[0], containerInput[1], containerInput[2], containerInput[3], containerInput[4], containerInput[5]));
 262                         fCFManager->GetParticleContainer()->Fill(containerInput,1) ;
 263                 }
 264                 /*
 265                 // for debugging only, filling container with dummy values
 266                 Double_t pt = 1.5;
 267                 Double_t rapidity = 0.5;
 268                 Double_t cosThetaStar = 0.7;
 269                 Double_t pTpi = 2.5;
 270                 Double_t pTK = 1;
 271                 Double_t cT = 3;
 272                 containerInput[0] = pt;
 273                 containerInput[1] = rapidity;
 274                 containerInput[2] = cosThetaStar;
 275                 containerInput[3] = pTpi;
 276                 containerInput[4] = pTK;
 277                 containerInput[5] = cT;
 278                 fCFManager->GetParticleContainer()->Fill(containerInput,1) ;
 279                 */
 280
 281         }
 282
 283         fHistEventsProcessed->Fill(0);
 284         /* PostData(0) is taken care of by AliAnalysisTaskSE */
 285         PostData(1,fHistEventsProcessed) ;
 286         PostData(2,fCFManager->GetParticleContainer()) ;
 287 }
 288
 289
 290 //___________________________________________________________________________
 291 void AliCFHeavyFlavourTaskMultiVar::Terminate(Option_t*)
 292 {
 293         // The Terminate() function is the last function to be called during
 294         // a query. It always runs on the client, it can be used to present
 295         // the results graphically or save the results to file.
 296
 297         Info("Terminate","");
 298         AliAnalysisTaskSE::Terminate();
 299
 300         AliInfo(Form("Found %i MC particles that are D0 in MC in %d events",fCountMC,fEvents));
 301
 302         // draw some example plots....
 303
 304         AliCFContainer *cont= dynamic_cast<AliCFContainer*> (GetOutputData(2));
 305
 306         // projecting the containers to obtain histograms
 307         // first argument = variable, second argument = step
 308         TH1D* h00 =   cont->ShowProjection(0,0) ;   // pt
 309         TH1D* h10 =   cont->ShowProjection(1,0) ;   // rapidity
 310         TH1D* h20 =   cont->ShowProjection(2,0) ;   // cosThetaStar
 311         TH1D* h30 =   cont->ShowProjection(3,0) ;   // pTpi
 312         TH1D* h40 =   cont->ShowProjection(4,0) ;   // pTK
 313         TH1D* h50 =   cont->ShowProjection(5,0) ;   // cT
 314
 315         TH1D* h01 =   cont->ShowProjection(0,1) ;   // pt
 316         TH1D* h11 =   cont->ShowProjection(1,1) ;   // rapidity
 317         TH1D* h21 =   cont->ShowProjection(2,1) ;   // cosThetaStar
 318         TH1D* h31 =   cont->ShowProjection(3,1) ;   // pTpi
 319         TH1D* h41 =   cont->ShowProjection(4,1) ;   // pTK
 320         TH1D* h51 =   cont->ShowProjection(5,1) ;   // cT
 321
 322         h00->SetTitle("pT_D0 (GeV/c)");
 323         h10->SetTitle("rapidity");
 324         h20->SetTitle("cosThetaStar");
 325         h30->SetTitle("pT_pi (GeV/c)");
 326         h40->SetTitle("pT_K (Gev/c)");
 327         h50->SetTitle("cT (#mum)");
 328
 329         h00->GetXaxis()->SetTitle("pT_D0 (GeV/c)");
 330         h10->GetXaxis()->SetTitle("rapidity");
 331         h20->GetXaxis()->SetTitle("cosThetaStar");
 332         h30->GetXaxis()->SetTitle("pT_pi (GeV/c)");
 333         h40->GetXaxis()->SetTitle("pT_K (Gev/c)");
 334         h50->GetXaxis()->SetTitle("cT (#mum)");
 335
 336         h01->SetTitle("pT_D0 (GeV/c)");
 337         h11->SetTitle("rapidity");
 338         h21->SetTitle("cosThetaStar");
 339         h31->SetTitle("pT_pi (GeV/c)");
 340         h41->SetTitle("pT_K (Gev/c)");
 341         h51->SetTitle("cT (#mum)");
 342
 343         h01->GetXaxis()->SetTitle("pT_D0 (GeV/c)");
 344         h11->GetXaxis()->SetTitle("rapidity");
 345         h21->GetXaxis()->SetTitle("cosThetaStar");
 346         h31->GetXaxis()->SetTitle("pT_pi (GeV/c)");
 347         h41->GetXaxis()->SetTitle("pT_K (Gev/c)");
 348         h51->GetXaxis()->SetTitle("cT (#mum)");
 349
 350         Double_t max0 = h00->GetMaximum();
 351         Double_t max1 = h10->GetMaximum();
 352         Double_t max2 = h20->GetMaximum();
 353         Double_t max3 = h30->GetMaximum();
 354         Double_t max4 = h40->GetMaximum();
 355         Double_t max5 = h50->GetMaximum();
 356
 357         h00->GetYaxis()->SetRangeUser(0,max0*1.2);
 358         h10->GetYaxis()->SetRangeUser(0,max1*1.2);
 359         h20->GetYaxis()->SetRangeUser(0,max2*1.2);
 360         h30->GetYaxis()->SetRangeUser(0,max3*1.2);
 361         h40->GetYaxis()->SetRangeUser(0,max4*1.2);
 362         h50->GetYaxis()->SetRangeUser(0,max5*1.2);
 363
 364         h01->GetYaxis()->SetRangeUser(0,max0*1.2);
 365         h11->GetYaxis()->SetRangeUser(0,max1*1.2);
 366         h21->GetYaxis()->SetRangeUser(0,max2*1.2);
 367         h31->GetYaxis()->SetRangeUser(0,max3*1.2);
 368         h41->GetYaxis()->SetRangeUser(0,max4*1.2);
 369         h51->GetYaxis()->SetRangeUser(0,max5*1.2);
 370
 371         h00->SetMarkerStyle(20);
 372         h10->SetMarkerStyle(24);
 373         h20->SetMarkerStyle(21);
 374         h30->SetMarkerStyle(25);
 375         h40->SetMarkerStyle(27);
 376         h50->SetMarkerStyle(28);
 377
 378         h00->SetMarkerColor(2);
 379         h10->SetMarkerColor(2);
 380         h20->SetMarkerColor(2);
 381         h30->SetMarkerColor(2);
 382         h40->SetMarkerColor(2);
 383         h50->SetMarkerColor(2);
 384
 385         h01->SetMarkerStyle(20) ;
 386         h11->SetMarkerStyle(24) ;
 387         h21->SetMarkerStyle(21) ;
 388         h31->SetMarkerStyle(25) ;
 389         h41->SetMarkerStyle(27) ;
 390         h51->SetMarkerStyle(28) ;
 391
 392         h01->SetMarkerColor(4);
 393         h11->SetMarkerColor(4);
 394         h21->SetMarkerColor(4);
 395         h31->SetMarkerColor(4);
 396         h41->SetMarkerColor(4);
 397         h51->SetMarkerColor(4);
 398
 399         gStyle->SetCanvasColor(0);
 400         gStyle->SetFrameFillColor(0);
 401         gStyle->SetTitleFillColor(0);
 402         gStyle->SetStatColor(0);
 403
 404         // drawing in 2 separate canvas for a matter of clearity
 405         TCanvas * c1 =new TCanvas("c1","pT, rapidiy, cosThetaStar",800,1600);
 406         TCanvas * c2 =new TCanvas("c2","pTpi, pTK, cT",800,1600);
 407         c1->Divide(2,3);
 408         c2->Divide(2,3);
 409
 410         c1->cd(1);
 411         h00->Draw("p");
 412         c1->cd(2);
 413         h01->Draw("p");
 414         c1->cd(3);
 415         h10->Draw("p");
 416         c1->cd(4);
 417         h11->Draw("p");
 418         c1->cd(5);
 419         h20->Draw("p");
 420         c1->cd(6);
 421         h21->Draw("p");
 422         c1->cd();
 423
 424         c2->cd(1);
 425         h30->Draw("p");
 426         c2->cd(2);
 427         h31->Draw("p");
 428         c2->cd(3);
 429         h40->Draw("p");
 430         c2->cd(4);
 431         h41->Draw("p");
 432         c2->cd(5);
 433         h50->Draw("p");
 434         c2->cd(6);
 435         h51->Draw("p");
 436         c2->cd();
 437
 438         c1->SaveAs("Variables/pT_rapidity_cosThetaStar.eps");
 439         c2->SaveAs("Variables/pTpi_pTK_cT.eps");
 440
 441 }
 442
 443 //___________________________________________________________________________
 444 void AliCFHeavyFlavourTaskMultiVar::UserCreateOutputObjects() {
 445         //HERE ONE CAN CREATE OUTPUT OBJECTS, IN PARTICULAR IF THE OBJECT PARAMETERS DON'T NEED
 446         //TO BE SET BEFORE THE EXECUTION OF THE TASK
 447         //
 448         Info("UserCreateOutputObjects","CreateOutputObjects of task %s\n", GetName());
 449
 450         //slot #1
 451         OpenFile(1);
 452         fHistEventsProcessed = new TH1I("fHistEventsProcessed","",1,0,1) ;
 453 }
 454
 455 //___________________________________________________________________________
 456 Double_t AliCFHeavyFlavourTaskMultiVar::CosThetaStar(AliAODMCParticle* mcPart, AliAODMCParticle* mcPartDaughter0, AliAODMCParticle* mcPartDaughter1) const {
 457
 458         //
 459         // to calculate cos(ThetaStar) for generated particle
 460         // using the K, since mcPartDaughter0 and mcPartDaughter1 always correspond to K and pi respectively
 461         // (see where the function is called)
 462         //
 463
 464         Int_t pdgvtx = mcPart->GetPdgCode();
 465         /*      if (pdgvtx > 0) { // setting as the first daughter always the kaon, to be used to calculate cos(ThetaStar)
 466                 Int_t pdgprong0 = TMath::Abs(mcPartDaughter0->GetPdgCode());
 467                 Int_t pdgprong1 = TMath::Abs(mcPartDaughter1->GetPdgCode());
 468                 AliInfo(Form("D0, with pdgprong0 = %d, pdgprong1 = %d",pdgprong0,pdgprong1));
 469                 AliDebug(2,"This is a D0");
 470                 AliAODMCParticle* mcPartdummy = mcPartDaughter0;
 471                 mcPartDaughter0 = mcPartDaughter1;
 472                 mcPartDaughter1 = mcPartdummy;
 473         }
 474         else{
 475                 AliInfo("D0bar");
 476         }
 477         */
 478         Int_t pdgprong0 = TMath::Abs(mcPartDaughter0->GetPdgCode());
 479         Int_t pdgprong1 = TMath::Abs(mcPartDaughter1->GetPdgCode());
 480         if (pdgvtx > 0) { // setting as the first daughter always the kaon, to be used to calculate cos(ThetaStar)
 481                 AliDebug(2,"D0");
 482         }
 483         else{
 484                 AliDebug(2,"D0bar");
 485         }
 486         if (pdgprong0 == 211){
 487                 AliDebug(2,Form("pdgprong0 = %d, pdgprong1 = %d, switching...",pdgprong0,pdgprong1));
 488                 AliAODMCParticle* mcPartdummy = mcPartDaughter0;
 489                 mcPartDaughter0 = mcPartDaughter1;
 490                 mcPartDaughter1 = mcPartdummy;
 491                 pdgprong0 = TMath::Abs(mcPartDaughter0->GetPdgCode());
 492                 pdgprong1 = TMath::Abs(mcPartDaughter1->GetPdgCode());
 493         }
 494
 495         AliDebug(2,Form("After checking, pdgprong0 = %d, pdgprong1 = %d",pdgprong0,pdgprong1));
 496         Double_t massvtx = TDatabasePDG::Instance()->GetParticle(TMath::Abs(pdgvtx))->Mass();
 497         Double_t massp[2];
 498         massp[0] = TDatabasePDG::Instance()->GetParticle(pdgprong0)->Mass();
 499         massp[1] = TDatabasePDG::Instance()->GetParticle(pdgprong1)->Mass();
 500
 501         Double_t pStar = TMath::Sqrt(TMath::Power(massvtx*massvtx-massp[0]*massp[0]-massp[1]*massp[1],2.)-4.*massp[0]*massp[0]*massp[1]*massp[1])/(2.*massvtx);
 502
 503         Double_t px = mcPartDaughter0->Px()+mcPartDaughter1->Px();
 504         Double_t py = mcPartDaughter0->Py()+mcPartDaughter1->Py();
 505         Double_t pz = mcPartDaughter0->Pz()+mcPartDaughter1->Pz();
 506         Double_t p = TMath::Sqrt(px*px+py*py+pz*pz);
 507         Double_t e =  TMath::Sqrt(massvtx*massvtx+p*p);
 508         Double_t beta = p/e;
 509         Double_t gamma = e/massvtx;
 510         TVector3 mom(mcPartDaughter0->Px(),mcPartDaughter0->Py(),mcPartDaughter0->Pz());
 511         TVector3 momTot(mcPartDaughter0->Px()+mcPartDaughter1->Px(),mcPartDaughter0->Py()+mcPartDaughter1->Py(),mcPartDaughter0->Pz()+mcPartDaughter1->Pz());
 512
 513         Double_t qlprong = mom.Dot(momTot)/momTot.Mag();  // analog to AliAODRecoDecay::QlProng(0)
 514
 515         AliDebug(2,Form("pStar = %f, beta = %f, gamma = %f, qlprong = %f, massp[0] = %f", pStar, beta, gamma, qlprong, massp[0]));
 516         Double_t cts = (qlprong/gamma-beta*TMath::Sqrt(pStar*pStar+massp[0]*massp[0]))/pStar;
 517         AliDebug(2,Form("cts = %f", cts));
 518         return cts;
 519 }
 520 //___________________________________________________________________________
 521 Double_t AliCFHeavyFlavourTaskMultiVar::CT(AliAODMCParticle* mcPart, AliAODMCParticle* mcPartDaughter0, AliAODMCParticle* mcPartDaughter1) const {
 522
 523         //
 524         // to calculate cT for generated particle
 525         //
 526
 527         Double_t xmcPart[3] = {0,0,0};
 528         Double_t xdaughter0[3] = {0,0,0};
 529         Double_t xdaughter1[3] = {0,0,0};
 530         mcPart->XvYvZv(xmcPart);  // cm
 531         mcPartDaughter0->XvYvZv(xdaughter0);  // cm
 532         mcPartDaughter1->XvYvZv(xdaughter1);  //cm
 533         Double_t prodVtxD0 = TMath::Sqrt(xmcPart[0]*xmcPart[0]+
 534                                          xmcPart[1]*xmcPart[1]+
 535                                          xmcPart[2]*xmcPart[2]);
 536         Double_t prodVtxDaughter0 = TMath::Sqrt(xdaughter0[0]*xdaughter0[0]+
 537                                                 xdaughter0[1]*xdaughter0[1]+
 538                                                 xdaughter0[2]*xdaughter0[2]);
 539         Double_t prodVtxDaughter1 = TMath::Sqrt(xdaughter1[0]*xdaughter1[0]+
 540                                                 xdaughter1[1]*xdaughter1[1]+
 541                                                 xdaughter1[2]*xdaughter1[2]);
 542
 543         AliDebug(2, Form("D0:        x = %f, y = %f, z = %f, production vertex distance = %f (cm), %f (micron)", xmcPart[0], xmcPart[1], xmcPart[2], prodVtxD0, prodVtxD0*1.E4));
 544         AliDebug(2, Form("Daughter0: x = %f, y = %f, z = %f, production vertex distance = %f (cm) %f (micron)", xdaughter0[0], xdaughter0[1], xdaughter0[2], prodVtxDaughter0, prodVtxDaughter0*1E4));
 545         AliDebug(2, Form("Daughter1: x = %f, y = %f, z = %f, production vertex distance = %f (cm) %f (micron)", xdaughter1[0], xdaughter1[1], xdaughter1[2], prodVtxDaughter1, prodVtxDaughter1*1.E4));
 546
 547         Double_t cT0 = TMath::Sqrt((xdaughter0[0]-xmcPart[0])*(xdaughter0[0]-xmcPart[0])+
 548                                      (xdaughter0[1]-xmcPart[1])*(xdaughter0[1]-xmcPart[1])+
 549                                      (xdaughter0[2]-xmcPart[2])*(xdaughter0[2]-xmcPart[2]));
 550
 551         Double_t cT1 = TMath::Sqrt((xdaughter1[0]-xmcPart[0])*(xdaughter1[0]-xmcPart[0])+
 552                                      (xdaughter1[1]-xmcPart[1])*(xdaughter1[1]-xmcPart[1])+
 553                                      (xdaughter1[2]-xmcPart[2])*(xdaughter1[2]-xmcPart[2]));
 554
 555         if (cT0 != cT1) {
 556                 AliWarning("cT from daughter 0 different from cT from daughter 1! Using cT from daughter 0, but PLEASE, CHECK....");
 557         }
 558
 559         // calculating cT from cT0
 560
 561         Double_t mass = TDatabasePDG::Instance()->GetParticle(mcPart->GetPdgCode())->Mass(); // mcPart->GetPdgCode() should return +/- 421 for the D0/D0bar
 562         Double_t p = mcPart-> P();
 563         Double_t cT = cT0*mass/p;
 564         AliDebug(2, Form("cT from daughter 0 = %f (micron)", cT0*1E4));
 565         AliDebug(2, Form("cT from daughter 1 = %f (micron)", cT1*1E4));
 566         AliDebug(2, Form("cT (with mass = %f and p = %f) = %f (micron)", mass, p, cT*1E4));
 567         return cT;
 568 }
 569 //________________________________________________________________________________
 570 Bool_t AliCFHeavyFlavourTaskMultiVar::GetGeneratedValuesFromMCParticle(AliAODMCParticle* mcPart, TClonesArray* mcArray, Double_t* vectorMC) const {
 571
 572         //
 573         // collecting all the necessary info (pt, y, cosThetaStar, ptPi, ptKa, cT) from MC particle
 574         //
 575
 576         Bool_t isOk = kFALSE;
 577
 578         // check whether the D0 decays in pi+K
 579         // to be added!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 580         // could use a cut in the CF, but not clear how to define a TDecayChannel
 581         // implemented for the time being as a cut on the number of daughters - see later when
 582         // getting the daughters
 583
 584         // getting the daughters
 585         Int_t daughter0 = mcPart->GetDaughter(0);
 586         Int_t daughter1 = mcPart->GetDaughter(1);
 587         AliDebug(2, Form("daughter0 = %d and daughter1 = %d",daughter0,daughter1));
 588         if (daughter0 == 0 || daughter1 == 0) {
 589                 AliDebug(2, "Error! the D0 MC doesn't have correct daughters!!");
 590                 return isOk;
 591         }
 592         if (TMath::Abs(daughter1 - daughter0 != 1)) {
 593                 AliDebug(2, "The D0 MC doesn't come from a 2-prong decay, skipping!!");
 594                 return isOk;
 595         }
 596         AliAODMCParticle* mcPartDaughter0 = dynamic_cast<AliAODMCParticle*>(mcArray->At(daughter0));
 597         AliAODMCParticle* mcPartDaughter1 = dynamic_cast<AliAODMCParticle*>(mcArray->At(daughter1));
 598         if (!mcPartDaughter0 || !mcPartDaughter1) {
 599                 AliWarning("At least one Daughter Particle not found in tree, skipping");
 600                 return isOk;
 601         }
 602
 603         Double_t vtx1[3] = {0,0,0};   // primary vertex
 604         Double_t vtx2daughter0[3] = {0,0,0};   // secondary vertex from daughter 0
 605         Double_t vtx2daughter1[3] = {0,0,0};   // secondary vertex from daughter 1
 606         mcPart->XvYvZv(vtx1);  // cm
 607         // getting vertex from daughters
 608         mcPartDaughter0->XvYvZv(vtx2daughter0);  // cm
 609         mcPartDaughter1->XvYvZv(vtx2daughter1);  //cm
 610         if (vtx2daughter0[0] != vtx2daughter1[0] && vtx2daughter0[1] != vtx2daughter1[1] && vtx2daughter0[2] != vtx2daughter1[2]) {
 611                 AliError("Daughters have different secondary vertex, skipping the track");
 612                 return isOk;
 613         }
 614         Int_t nprongs = 2;
 615         Short_t charge = 0;
 616         // always instantiate the AliAODRecoDecay with the positive daughter first, the negative second
 617         AliAODMCParticle* positiveDaugh = mcPartDaughter0;
 618         AliAODMCParticle* negativeDaugh = mcPartDaughter1;
 619         if (mcPartDaughter0->GetPdgCode()<0 && mcPartDaughter1->GetPdgCode()>0){
 620                 // inverting in case the positive daughter is the second one
 621                 positiveDaugh = mcPartDaughter1;
 622                 negativeDaugh = mcPartDaughter0;
 623         }
 624         // getting the momentum from the daughters
 625         Double_t px[2] = {positiveDaugh->Px(), negativeDaugh->Px()};
 626         Double_t py[2] = {positiveDaugh->Py(), negativeDaugh->Py()};
 627         Double_t pz[2] = {positiveDaugh->Pz(), negativeDaugh->Pz()};
 628
 629         Double_t d0[2] = {0.,0.};
 630
 631         AliAODRecoDecayHF* decay = new AliAODRecoDecayHF(vtx1,vtx2daughter0,nprongs,charge,px,py,pz,d0);
 632
 633         Double_t cosThetaStar = 0.;
 634         Double_t cosThetaStarD0 = 0.;
 635         Double_t cosThetaStarD0bar = 0.;
 636         cosThetaStarD0 = decay->CosThetaStar(1,421,211,321);
 637         cosThetaStarD0bar = decay->CosThetaStar(0,421,321,211);
 638         if (mcPart->GetPdgCode() == 421){  // D0
 639                 AliDebug(3, Form("D0, with pdgprong0 = %d, pdgprong1 = %d",mcPartDaughter0->GetPdgCode(),mcPartDaughter1->GetPdgCode()));
 640                 cosThetaStar = cosThetaStarD0;
 641         }
 642         else if (mcPart->GetPdgCode() == -421){  // D0bar{
 643                 AliDebug(3, Form("D0bar, with pdgprong0 = %d, pdgprong1 = %d",mcPartDaughter0->GetPdgCode(),mcPartDaughter1->GetPdgCode()));
 644                 cosThetaStar = cosThetaStarD0bar;
 645         }
 646         else{
 647                 AliWarning("There are problems!! particle was expected to be either a D0 or a D0bar, check...");
 648                 return vectorMC;
 649         }
 650         if (cosThetaStar < -1 || cosThetaStar > 1) {
 651                 AliWarning("Invalid value for cosine Theta star, returning");
 652                 return isOk;
 653         }
 654
 655         // calculate cos(Theta*) according to the method implemented herein
 656
 657         Double_t cts = 9999.;
 658         cts = CosThetaStar(mcPart, mcPartDaughter0, mcPartDaughter1);
 659         if (cts < -1 || cts > 1) {
 660                 AliWarning("Invalid value for cosine Theta star from AliCFHeavyFlavourTaskMultiVar method");
 661         }
 662         if (TMath::Abs(cts - cosThetaStar)>0.001) {
 663                 AliError(Form("cosThetaStar automatically calculated different from that manually calculated!!! cosThetaStar = %f, cosThetaStar = %f", cosThetaStar,cts));
 664         }
 665
 666         Double_t cT = decay->Ct(421);
 667
 668         // calculate cT from the method implemented herein
 669         Double_t cT1 = 0.;
 670         cT1 = CT(mcPart, mcPartDaughter0, mcPartDaughter1);
 671
 672         if (TMath::Abs(cT1 - cT)>0.001) {
 673                 AliError(Form("cT automatically calculated different from that manually calculated!!! cT = %f, cT1 = %f",cT,cT1));
 674         }
 675
 676         // get the pT of the daughters
 677
 678         Double_t pTpi = 0.;
 679         Double_t pTK = 0.;
 680
 681         if (TMath::Abs(mcPartDaughter0->GetPdgCode()) == 211) {
 682                 pTpi = mcPartDaughter0->Pt();
 683                 pTK = mcPartDaughter1->Pt();
 684         }
 685         else {
 686                 pTpi = mcPartDaughter1->Pt();
 687                 pTK = mcPartDaughter0->Pt();
 688         }
 689
 690         vectorMC[0] = mcPart->Pt();
 691         vectorMC[1] = mcPart->Y() ;
 692         vectorMC[2] = cosThetaStar ;
 693         vectorMC[3] = pTpi ;
 694         vectorMC[4] = pTK ;
 695         vectorMC[5] = cT*1.E4 ;  // in micron
 696         isOk = kTRUE;
 697         return isOk;
 698 }
 699