[u/mrichter/AliRoot.git] / PWG0 / multiplicity / AliMultiplicityTask.cxx

/* $Id$ */

#include "AliMultiplicityTask.h"

#include <TStyle.h>
#include <TSystem.h>
#include <TCanvas.h>
#include <TVector3.h>
#include <TChain.h>
#include <TFile.h>
#include <TH2F.h>
#include <TH3F.h>
#include <TParticle.h>
#include <TRandom.h>
#include <TNtuple.h>
#include <TObjString.h>
#include <TF1.h>

#include <AliLog.h>
#include <AliESDVertex.h>
#include <AliESDEvent.h>
#include <AliStack.h>
#include <AliHeader.h>
#include <AliGenEventHeader.h>
#include <AliMultiplicity.h>
#include <AliAnalysisManager.h>
#include <AliMCEventHandler.h>
#include <AliMCEvent.h>
#include <AliESDInputHandler.h>

#include "esdTrackCuts/AliESDtrackCuts.h"
#include "AliPWG0Helper.h"
#include "dNdEta/AliMultiplicityCorrection.h"
#include "AliCorrection.h"
#include "AliCorrectionMatrix3D.h"

//#define TPCMEASUREMENT
#define ITSMEASUREMENT

ClassImp(AliMultiplicityTask)

AliMultiplicityTask::AliMultiplicityTask(const char* opt) :
  AliAnalysisTask("AliMultiplicityTask", ""),
  fESD(0),
  fOption(opt),
  fMultiplicity(0),
  fEsdTrackCuts(0),
  fSystSkipParticles(kFALSE),
  fSelectProcessType(0),
  fParticleSpecies(0),
  fPtSpectrum(0),
  fOutput(0)
{
  //
  // Constructor. Initialization of pointers
  //

  for (Int_t i = 0; i<4; i++)
    fParticleCorrection[i] = 0;

  // Define input and output slots here
  DefineInput(0, TChain::Class());
  DefineOutput(0, TList::Class());
}

AliMultiplicityTask::~AliMultiplicityTask()
{
  //
  // Destructor
  //

  // histograms are in the output list and deleted when the output
  // list is deleted by the TSelector dtor

  if (fOutput) {
    delete fOutput;
    fOutput = 0;
  }
}

//________________________________________________________________________
void AliMultiplicityTask::ConnectInputData(Option_t *)
{
  // Connect ESD
  // Called once

  TTree* tree = dynamic_cast<TTree*> (GetInputData(0));
  if (!tree) {
    Printf("ERROR: Could not read tree from input slot 0");
  } else {
    // Disable all branches and enable only the needed ones
    tree->SetBranchStatus("*", 0);
    tree->SetBranchStatus("fTriggerMask", 1);
    tree->SetBranchStatus("fSPDVertex*", 1);

    #ifdef ITSMEASUREMENT
      tree->SetBranchStatus("fSPDMult*", 1);
    #endif

    #ifdef TPCMEASUREMENT
      AliESDtrackCuts::EnableNeededBranches(tree);
      tree->SetBranchStatus("fTracks.fLabel", 1);
    #endif

    tree->SetCacheSize(0);

    AliESDInputHandler *esdH = dynamic_cast<AliESDInputHandler*> (AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler());

    if (!esdH) {
      Printf("ERROR: Could not get ESDInputHandler");
    } else
      fESD = esdH->GetEvent();
  }
}

void AliMultiplicityTask::CreateOutputObjects()
{
  // create result objects and add to output list

  fOutput = new TList;
  fOutput->SetOwner();

  fMultiplicity = new AliMultiplicityCorrection("Multiplicity", "Multiplicity");
  fOutput->Add(fMultiplicity);

  if (fOption.Contains("skip-particles"))
  {
    fSystSkipParticles = kTRUE;
    AliInfo("WARNING: Systematic study enabled. Particles will be skipped.");
  }

  if (fOption.Contains("particle-efficiency"))
    for (Int_t i = 0; i<4; i++)
    {
      fParticleCorrection[i] = new AliCorrection(Form("correction_%d", i), Form("correction_%d", i));
      fOutput->Add(fParticleCorrection[i]);
    }

  if (fOption.Contains("only-process-type-nd"))
    fSelectProcessType = 1;

  if (fOption.Contains("only-process-type-sd"))
    fSelectProcessType = 2;

  if (fOption.Contains("only-process-type-dd"))
    fSelectProcessType = 3;

  if (fSelectProcessType != 0)
    AliInfo(Form("WARNING: Systematic study enabled. Only considering process type %d", fSelectProcessType));

  if (fOption.Contains("pt-spectrum-hist"))
  {
    TFile* file = TFile::Open("ptspectrum_fit.root");
    if (file)
    {
      TString subStr(fOption(fOption.Index("pt-spectrum")+17, 3));
      TString histName(Form("ptspectrum_%s", subStr.Data()));
      AliInfo(Form("Pt-Spectrum modification. Using %s.", histName.Data()));
      fPtSpectrum = (TH1*) file->Get(histName);
      if (!fPtSpectrum)
	AliError("Histogram not found");
    }
    else
      AliError("Could not open ptspectrum_fit.root. Pt Spectrum study could not be enabled.");

    if (fPtSpectrum)
      AliInfo("WARNING: Systematic study enabled. Pt spectrum will be modified");
  }

  if (fOption.Contains("pt-spectrum-func"))
  {
    if (fPtSpectrum)
    {
      Printf("Using function from input list for systematic p_t study");
    }
    else
    {
      fPtSpectrum = new TH1F("fPtSpectrum", "fPtSpectrum", 1, 0, 100);
      fPtSpectrum->SetBinContent(1, 1);
    }

    if (fPtSpectrum)
      AliInfo("WARNING: Systematic study enabled. Pt spectrum will be modified");
  }

  if (fOption.Contains("particle-species")) {
    fParticleSpecies = new TNtuple("fParticleSpecies", "fParticleSpecies", "vtx:Pi_True:K_True:p_True:o_True:Pi_Rec:K_Rec:p_Rec:o_Rec:nolabel:doublePrim:doubleCount");
    fOutput->Add(fParticleSpecies);
  }

  // TODO set seed for random generator
}

void AliMultiplicityTask::Exec(Option_t*)
{
  // process the event

  // Check prerequisites
  if (!fESD)
  {
    AliDebug(AliLog::kError, "ESD branch not available");
    return;
  }

  if (!fEsdTrackCuts)
  {
    AliDebug(AliLog::kError, "fESDTrackCuts not available");
    return;
  }

  AliAnalysisManager* mgr = AliAnalysisManager::GetAnalysisManager();
  if (!mgr) {
     Printf("ERROR: Could not retrieve manager");
     return;
  }

  AliMCEventHandler* eventHandler = dynamic_cast<AliMCEventHandler*> (mgr->GetMCtruthEventHandler());
  if (!eventHandler) {
    Printf("ERROR: Could not retrieve MC event handler");
    return;
  }

  AliMCEvent* mcEvent = eventHandler->MCEvent();
  if (!mcEvent) {
     Printf("ERROR: Could not retrieve MC event");
     return;
  }

  AliStack* stack = mcEvent->Stack();
  if (!stack)
  {
    AliDebug(AliLog::kError, "Stack not available");
    return;
  }

  AliHeader* header = mcEvent->Header();
  if (!header)
  {
    AliDebug(AliLog::kError, "Header not available");
    return;
  }

  // post the output already here, because there are several exit possibilities below
  PostData(0, fOutput);

  if (fSelectProcessType > 0)
  {
    // getting process information; NB: this only works for Pythia
    Int_t processtype = AliPWG0Helper::GetPythiaEventProcessType(header);

    Bool_t processEvent = kFALSE;

    // non diffractive
    if (fSelectProcessType == 1 && processtype !=92 && processtype !=93 && processtype != 94)
      processEvent = kTRUE;

    // single diffractive
    if (fSelectProcessType == 2 && (processtype == 92 || processtype == 93))
      processEvent = kTRUE;

    // double diffractive
    if (fSelectProcessType == 3 && processtype == 94)
      processEvent = kTRUE;

    if (!processEvent)
    {
      AliDebug(AliLog::kDebug, Form("Skipping this event, because it is not of the requested process type (%d)", processtype));
      return;
    }
  }

  Bool_t eventTriggered = AliPWG0Helper::IsEventTriggered(fESD->GetTriggerMask());
  eventTriggered = kTRUE; // no generated trigger for the simulated events

  Bool_t eventVertex = AliPWG0Helper::IsVertexReconstructed(fESD->GetVertex());

  // get the ESD vertex
  const AliESDVertex* vtxESD = fESD->GetVertex();
  Double_t vtx[3];
  vtxESD->GetXYZ(vtx);

  // get the MC vertex
  AliGenEventHeader* genHeader = header->GenEventHeader();
  TArrayF vtxMC(3);
  genHeader->PrimaryVertex(vtxMC);

  // get tracklets
  const AliMultiplicity* mult = fESD->GetMultiplicity();
  if (!mult)
  {
    AliDebug(AliLog::kError, "AliMultiplicity not available");
    return;
  }

  //const Float_t kPtCut = 0.3;

  // get number of tracks from MC
  // loop over mc particles
  Int_t nPrim  = stack->GetNprimary();
  Int_t nMCPart = stack->GetNtrack();

  // tracks in different eta ranges
  Int_t nMCTracks05 = 0;
  Int_t nMCTracks09 = 0;
  Int_t nMCTracks15 = 0;
  Int_t nMCTracks20 = 0;
  Int_t nMCTracksAll = 0;

  // tracks per particle species, in |eta| < 2 (systematic study)
  Int_t nMCTracksSpecies[4]; // (pi, K, p, other)
  for (Int_t i = 0; i<4; ++i)
    nMCTracksSpecies[i] = 0;
  // eta range for nMCTracksSpecies, nESDTracksSpecies
#ifdef ITSMEASUREMENT
  const Float_t etaRange = 2.0;
#else
  const Float_t etaRange = 0.9;
#endif

  for (Int_t iMc = 0; iMc < nPrim; ++iMc)
  {
    AliDebug(AliLog::kDebug+1, Form("MC Loop: Processing particle %d.", iMc));

    TParticle* particle = stack->Particle(iMc);

    if (!particle)
    {
      AliDebug(AliLog::kError, Form("UNEXPECTED: particle with label %d not found in stack (mc loop).", iMc));
      continue;
    }

    Bool_t debug = kFALSE;
    if (AliPWG0Helper::IsPrimaryCharged(particle, nPrim, debug) == kFALSE)
    {
      //printf("%d) DROPPED ", iMC);
      //particle->Print();
      continue;
    }

    //printf("%d) OK      ", iMC);
    //particle->Print();

    //if (particle->Pt() < kPtCut)
    //  continue;

    Int_t particleWeight = 1;

    Float_t pt = particle->Pt();

    // in case of systematic study, weight according to the change of the pt spectrum
    // it cannot be just multiplied because we cannot count "half of a particle"
    // instead a random generator decides if the particle is counted twice (if value > 1)
    // or not (if value < 0)
    if (fPtSpectrum)
    {
      Int_t bin = fPtSpectrum->FindBin(pt);
      if (bin > 0 && bin <= fPtSpectrum->GetNbinsX())
      {
        Float_t factor = fPtSpectrum->GetBinContent(bin);
        if (factor > 0)
        {
          Float_t random = gRandom->Uniform();
          if (factor > 1 && random < factor - 1)
          {
            particleWeight = 2;
          }
          else if (factor < 1 && random < 1 - factor)
            particleWeight = 0;
        }
      }
    }

    //Printf("MC weight is: %d", particleWeight);

    if (TMath::Abs(particle->Eta()) < 0.5)
      nMCTracks05 += particleWeight;

    if (TMath::Abs(particle->Eta()) < 0.9)
      nMCTracks09 += particleWeight;

    if (TMath::Abs(particle->Eta()) < 1.5)
      nMCTracks15 += particleWeight;

    if (TMath::Abs(particle->Eta()) < 2.0)
      nMCTracks20 += particleWeight;

    nMCTracksAll += particleWeight;

    if (fParticleCorrection[0] || fParticleSpecies)
    {
      Int_t id = -1;
      switch (TMath::Abs(particle->GetPdgCode()))
      {
        case 211: id = 0; break;
        case 321: id = 1; break;
        case 2212: id = 2; break;
        default: id = 3; break;
      }
      if (TMath::Abs(particle->Eta()) < etaRange)
        nMCTracksSpecies[id]++;
      if (fParticleCorrection[id])
        fParticleCorrection[id]->GetTrackCorrection()->FillGene(vtxMC[2], particle->Eta(), particle->Pt());
    }
  }// end of mc particle

  fMultiplicity->FillGenerated(vtxMC[2], eventTriggered, eventVertex, (Int_t) nMCTracks05, (Int_t) nMCTracks09, (Int_t) nMCTracks15, (Int_t) nMCTracks20, (Int_t) nMCTracksAll);

  if (!eventTriggered || !eventVertex)
    return;

  Int_t nESDTracks05 = 0;
  Int_t nESDTracks09 = 0;
  Int_t nESDTracks15 = 0;
  Int_t nESDTracks20 = 0;

  // tracks per particle species, in |eta| < 2 (systematic study)
  Int_t nESDTracksSpecies[7]; // (pi, K, p, other, nolabel, doublecount_prim, doublecount_all)
  for (Int_t i = 0; i<7; ++i)
    nESDTracksSpecies[i] = 0;

  Bool_t* foundPrimaries = new Bool_t[nPrim];   // to prevent double counting
  for (Int_t i=0; i<nPrim; i++)
    foundPrimaries[i] = kFALSE;

  Bool_t* foundTracks = new Bool_t[nMCPart];    // to prevent double counting
  for (Int_t i=0; i<nMCPart; i++)
    foundTracks[i] = kFALSE;

#ifdef ITSMEASUREMENT
  // get multiplicity from ITS tracklets
  for (Int_t i=0; i<mult->GetNumberOfTracklets(); ++i)
  {
    //printf("%d %f %f %f\n", i, mult->GetTheta(i), mult->GetPhi(i), mult->GetDeltaPhi(i));

    // This removes non-tracklets in PDC06 data. Very bad solution. New solution is implemented for newer data. Keeping this for compatibility.
    if (mult->GetDeltaPhi(i) < -1000)
      continue;

    // systematic study: 10% lower efficiency
    if (fSystSkipParticles && (gRandom->Uniform() < 0.1))
      continue;

    Float_t theta = mult->GetTheta(i);
    Float_t eta   = -TMath::Log(TMath::Tan(theta/2.));

    // TODO define needed, because this only works with new AliRoot
    Int_t label = mult->GetLabel(i);
#endif
#ifdef TPCMEASUREMENT
  // get multiplicity from ESD tracks
  TObjArray* list = fEsdTrackCuts->GetAcceptedTracks(fESD);
  Int_t nGoodTracks = list->GetEntries();
  // loop over esd tracks
  for (Int_t i=0; i<nGoodTracks; i++)
  {
    AliESDtrack* esdTrack = dynamic_cast<AliESDtrack*> (list->At(i));
    if (!esdTrack)
    {
      AliDebug(AliLog::kError, Form("ERROR: Could not retrieve track %d.", i));
      continue;
    }

    Double_t p[3];
    esdTrack->GetConstrainedPxPyPz(p); 
    TVector3 vector(p);

    Float_t theta = vector.Theta();
    Float_t eta   = -TMath::Log(TMath::Tan(theta/2.));

    Int_t label = esdTrack->GetLabel();

    //Float_t pt = vector.Pt();
    //if (pt < kPtCut)
    //  continue;
#endif

    Int_t particleWeight = 1;

    // in case of systematic study, weight according to the change of the pt spectrum
    if (fPtSpectrum)
    {
      TParticle* mother = 0;

      // preserve label for later
      Int_t labelCopy = label;
      if (labelCopy >= 0)
        labelCopy = AliPWG0Helper::FindPrimaryMotherLabel(stack, labelCopy);
      if (labelCopy >= 0)
        mother = stack->Particle(labelCopy);

      // in case of pt study we do not count particles w/o label, because they cannot be scaled
      if (!mother)
        continue;

      // it cannot be just multiplied because we cannot count "half of a particle"
      // instead a random generator decides if the particle is counted twice (if value > 1) 
      // or not (if value < 0)
      Int_t bin = fPtSpectrum->FindBin(mother->Pt());
      if (bin > 0 && bin <= fPtSpectrum->GetNbinsX())
      {
        Float_t factor = fPtSpectrum->GetBinContent(bin);
        if (factor > 0)
        {
          Float_t random = gRandom->Uniform();
          if (factor > 1 && random < factor - 1)
          {
            particleWeight = 2;
          }
          else if (factor < 1 && random < 1 - factor)
            particleWeight = 0;
        }
      }
    }

    //Printf("ESD weight is: %d", particleWeight);

    if (TMath::Abs(eta) < 0.5)
      nESDTracks05 += particleWeight;

    if (TMath::Abs(eta) < 0.9)
      nESDTracks09 += particleWeight;

    if (TMath::Abs(eta) < 1.5)
      nESDTracks15 += particleWeight;

    if (TMath::Abs(eta) < 2.0)
      nESDTracks20 += particleWeight;


    if (fParticleCorrection[0] || fParticleSpecies)
    {
      Int_t motherLabel = -1;
      TParticle* mother = 0;

      // find mother
      if (label >= 0)
        motherLabel = AliPWG0Helper::FindPrimaryMotherLabel(stack, label);
      if (motherLabel >= 0)
        mother = stack->Particle(motherLabel);

      if (!mother)
      {
        // count tracks that did not have a label
        if (TMath::Abs(eta) < etaRange)
          nESDTracksSpecies[4]++;
        continue;
      }

      // get particle type (pion, proton, kaon, other)
      Int_t id = -1;
      switch (TMath::Abs(mother->GetPdgCode()))
      {
        case 211: id = 0; break;
        case 321: id = 1; break;
        case 2212: id = 2; break;
        default: id = 3; break;
      }

      // double counting is ok for particle ratio study
      if (TMath::Abs(eta) < etaRange)
        nESDTracksSpecies[id]++;

      // double counting is not ok for efficiency study

      // check if we already counted this particle, this way distinguishes double counted particles (bug/artefact in tracking) or double counted primaries due to secondaries (physics)
      if (foundTracks[label])
      {
        if (TMath::Abs(eta) < etaRange)
          nESDTracksSpecies[6]++;
        continue;
      }
      foundTracks[label] = kTRUE;

      // particle (primary) already counted?
      if (foundPrimaries[motherLabel])
      {
        if (TMath::Abs(eta) < etaRange)
          nESDTracksSpecies[5]++;
        continue;
      }
      foundPrimaries[motherLabel] = kTRUE;

      if (fParticleCorrection[id])
        fParticleCorrection[id]->GetTrackCorrection()->FillMeas(vtxMC[2], mother->Eta(), mother->Pt());
    }
  }

  delete[] foundTracks;
  delete[] foundPrimaries;

  if ((Int_t) nMCTracks20 == 0 && nESDTracks20 > 3)
    printf("WARNING: Event has %d generated and %d reconstructed...\n", nMCTracks20, nESDTracks20);

  //printf("%.2f generated and %.2f reconstructed\n", nMCTracks20, nESDTracks20);

  //Printf("%f %f %f %f %f %f %f %f %f %f", vtxMC[2], nMCTracks05, nMCTracks09, nMCTracks15, nMCTracks20, nMCTracksAll, nESDTracks05, nESDTracks09, nESDTracks15, nESDTracks20);

  //Printf("%f %f %f %f %f %f %f %f %f %f", vtxMC[2], nMCTracks05, nMCTracks09, nMCTracks15, nMCTracks20, nMCTracksAll, nESDTracks05, nESDTracks09, nESDTracks15, nESDTracks20);

  fMultiplicity->FillMeasured(vtx[2], nESDTracks05, nESDTracks09, nESDTracks15, nESDTracks20);

  // fill response matrix using vtxMC (best guess)
  fMultiplicity->FillCorrection(vtxMC[2],  nMCTracks05,  nMCTracks09,  nMCTracks15,  nMCTracks20,  nMCTracksAll,  nESDTracks05,  nESDTracks09,  nESDTracks15,  nESDTracks20);

  if (fParticleSpecies)
    fParticleSpecies->Fill(vtxMC[2], nMCTracksSpecies[0], nMCTracksSpecies[1], nMCTracksSpecies[2], nMCTracksSpecies[3], nESDTracksSpecies[0], nESDTracksSpecies[1], nESDTracksSpecies[2], nESDTracksSpecies[3], nESDTracksSpecies[4], nESDTracksSpecies[5], nESDTracksSpecies[6]);

  //Printf("%d = %d %d %d %d %d %d %d", (Int_t) nESDTracks20, nESDTracksSpecies[0], nESDTracksSpecies[1], nESDTracksSpecies[2], nESDTracksSpecies[3], nESDTracksSpecies[4], nESDTracksSpecies[5], nESDTracksSpecies[6]);
}

void AliMultiplicityTask::Terminate(Option_t *)
{
  // The Terminate() function is the last function to be called during
  // a query. It always runs on the client, it can be used to present
  // the results graphically or save the results to file.

  fOutput = dynamic_cast<TList*> (GetOutputData(0));
  if (!fOutput) {
    Printf("ERROR: fOutput not available");
    return;
  }

  fMultiplicity = dynamic_cast<AliMultiplicityCorrection*> (fOutput->FindObject("Multiplicity"));
  for (Int_t i = 0; i < 4; ++i)
    fParticleCorrection[i] = dynamic_cast<AliCorrection*> (fOutput->FindObject(Form("correction_%d", i)));
  fParticleSpecies = dynamic_cast<TNtuple*> (fOutput->FindObject("fParticleSpecies"));

  if (!fMultiplicity)
  {
    AliDebug(AliLog::kError, Form("ERROR: Histograms not available %p", (void*) fMultiplicity));
    return;
  }

  TFile* file = TFile::Open("multiplicityMC.root", "RECREATE");

  fMultiplicity->SaveHistograms();
  for (Int_t i = 0; i < 4; ++i)
    if (fParticleCorrection[i])
      fParticleCorrection[i]->SaveHistograms();
  if (fParticleSpecies)
    fParticleSpecies->Write();

  TObjString option(fOption);
  option.Write();

  file->Close();

  Printf("Writting result to multiplicityMC.root");
}
Commit	Line	Data
a9017e49	1	/* $Id$ */
	2
	3	#include "AliMultiplicityTask.h"
	4
	5	#include <TStyle.h>
	6	#include <TSystem.h>
	7	#include <TCanvas.h>
	8	#include <TVector3.h>
	9	#include <TChain.h>
	10	#include <TFile.h>
	11	#include <TH2F.h>
	12	#include <TH3F.h>
	13	#include <TParticle.h>
	14	#include <TRandom.h>
	15	#include <TNtuple.h>
	16	#include <TObjString.h>
	17	#include <TF1.h>
	18
	19	#include <AliLog.h>
	20	#include <AliESDVertex.h>
	21	#include <AliESDEvent.h>
	22	#include <AliStack.h>
	23	#include <AliHeader.h>
	24	#include <AliGenEventHeader.h>
	25	#include <AliMultiplicity.h>
	26	#include <AliAnalysisManager.h>
	27	#include <AliMCEventHandler.h>
	28	#include <AliMCEvent.h>
	29	#include <AliESDInputHandler.h>
	30
	31	#include "esdTrackCuts/AliESDtrackCuts.h"
	32	#include "AliPWG0Helper.h"
	33	#include "dNdEta/AliMultiplicityCorrection.h"
	34	#include "AliCorrection.h"
	35	#include "AliCorrectionMatrix3D.h"
	36
	37	//#define TPCMEASUREMENT
	38	#define ITSMEASUREMENT
	39
	40	ClassImp(AliMultiplicityTask)
	41
	42	AliMultiplicityTask::AliMultiplicityTask(const char* opt) :
	43	AliAnalysisTask("AliMultiplicityTask", ""),
	44	fESD(0),
	45	fOption(opt),
	46	fMultiplicity(0),
	47	fEsdTrackCuts(0),
	48	fSystSkipParticles(kFALSE),
	49	fSelectProcessType(0),
	50	fParticleSpecies(0),
	51	fPtSpectrum(0),
	52	fOutput(0)
	53	{
	54	//
	55	// Constructor. Initialization of pointers
	56	//
	57
	58	for (Int_t i = 0; i<4; i++)
	59	fParticleCorrection[i] = 0;
	60
	61	// Define input and output slots here
	62	DefineInput(0, TChain::Class());
	63	DefineOutput(0, TList::Class());
	64	}
65
66	AliMultiplicityTask::~AliMultiplicityTask()
67	{
68	//
69	// Destructor
70	//
71
72	// histograms are in the output list and deleted when the output
73	// list is deleted by the TSelector dtor
74
75	if (fOutput) {
76	delete fOutput;
77	fOutput = 0;
78	}
79	}
80
81	//________________________________________________________________________
82	void AliMultiplicityTask::ConnectInputData(Option_t *)
83	{
84	// Connect ESD
85	// Called once
86
87	TTree* tree = dynamic_cast<TTree*> (GetInputData(0));
88	if (!tree) {
89	Printf("ERROR: Could not read tree from input slot 0");
90	} else {
91	// Disable all branches and enable only the needed ones
92	tree->SetBranchStatus("*", 0);
93	tree->SetBranchStatus("fTriggerMask", 1);
94	tree->SetBranchStatus("fSPDVertex*", 1);
95
96	#ifdef ITSMEASUREMENT
97	tree->SetBranchStatus("fSPDMult*", 1);
98	#endif
99
100	#ifdef TPCMEASUREMENT
101	AliESDtrackCuts::EnableNeededBranches(tree);
102	tree->SetBranchStatus("fTracks.fLabel", 1);
103	#endif
104
105	tree->SetCacheSize(0);
106
107	AliESDInputHandler esdH = dynamic_cast<AliESDInputHandler> (AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler());
108
109	if (!esdH) {
110	Printf("ERROR: Could not get ESDInputHandler");
111	} else
112	fESD = esdH->GetEvent();
113	}
114	}
115
116	void AliMultiplicityTask::CreateOutputObjects()
117	{
118	// create result objects and add to output list
119
120	fOutput = new TList;
121	fOutput->SetOwner();
122
123	fMultiplicity = new AliMultiplicityCorrection("Multiplicity", "Multiplicity");
124	fOutput->Add(fMultiplicity);
125
126	if (fOption.Contains("skip-particles"))
127	{
128	fSystSkipParticles = kTRUE;
129	AliInfo("WARNING: Systematic study enabled. Particles will be skipped.");
130	}
131
132	if (fOption.Contains("particle-efficiency"))
133	for (Int_t i = 0; i<4; i++)
134	{
135	fParticleCorrection[i] = new AliCorrection(Form("correction_%d", i), Form("correction_%d", i));
136	fOutput->Add(fParticleCorrection[i]);
137	}
138
139	if (fOption.Contains("only-process-type-nd"))
140	fSelectProcessType = 1;
141
142	if (fOption.Contains("only-process-type-sd"))
143	fSelectProcessType = 2;
144
145	if (fOption.Contains("only-process-type-dd"))
146	fSelectProcessType = 3;
147
148	if (fSelectProcessType != 0)
149	AliInfo(Form("WARNING: Systematic study enabled. Only considering process type %d", fSelectProcessType));
150
151	if (fOption.Contains("pt-spectrum-hist"))
152	{
153	TFile* file = TFile::Open("ptspectrum_fit.root");
154	if (file)
155	{
156	TString subStr(fOption(fOption.Index("pt-spectrum")+17, 3));
157	TString histName(Form("ptspectrum_%s", subStr.Data()));
158	AliInfo(Form("Pt-Spectrum modification. Using %s.", histName.Data()));
159	fPtSpectrum = (TH1*) file->Get(histName);
160	if (!fPtSpectrum)
161	AliError("Histogram not found");
162	}
163	else
164	AliError("Could not open ptspectrum_fit.root. Pt Spectrum study could not be enabled.");
165
166	if (fPtSpectrum)
167	AliInfo("WARNING: Systematic study enabled. Pt spectrum will be modified");
168	}
169
170	if (fOption.Contains("pt-spectrum-func"))
171	{
172	if (fPtSpectrum)
173	{
174	Printf("Using function from input list for systematic p_t study");
175	}
176	else
177	{
178	fPtSpectrum = new TH1F("fPtSpectrum", "fPtSpectrum", 1, 0, 100);
179	fPtSpectrum->SetBinContent(1, 1);
180	}
181
182	if (fPtSpectrum)
183	AliInfo("WARNING: Systematic study enabled. Pt spectrum will be modified");
184	}
185
186	if (fOption.Contains("particle-species")) {
187	fParticleSpecies = new TNtuple("fParticleSpecies", "fParticleSpecies", "vtx:Pi_True:K_True:p_True:o_True:Pi_Rec:K_Rec:p_Rec:o_Rec:nolabel:doublePrim:doubleCount");
188	fOutput->Add(fParticleSpecies);
189	}
190
191	// TODO set seed for random generator
192	}
193
194	void AliMultiplicityTask::Exec(Option_t*)
195	{
196	// process the event
197
198	// Check prerequisites
199	if (!fESD)
200	{
201	AliDebug(AliLog::kError, "ESD branch not available");
202	return;
203	}
204
205	if (!fEsdTrackCuts)
206	{
207	AliDebug(AliLog::kError, "fESDTrackCuts not available");
208	return;
209	}
210
211	AliAnalysisManager* mgr = AliAnalysisManager::GetAnalysisManager();
212	if (!mgr) {
213	Printf("ERROR: Could not retrieve manager");
214	return;
215	}
216
217	AliMCEventHandler* eventHandler = dynamic_cast<AliMCEventHandler*> (mgr->GetMCtruthEventHandler());
218	if (!eventHandler) {
219	Printf("ERROR: Could not retrieve MC event handler");
220	return;
221	}
222
223	AliMCEvent* mcEvent = eventHandler->MCEvent();
224	if (!mcEvent) {
225	Printf("ERROR: Could not retrieve MC event");
226	return;
227	}
228
229	AliStack* stack = mcEvent->Stack();
230	if (!stack)
231	{
232	AliDebug(AliLog::kError, "Stack not available");
233	return;
234	}
235
236	AliHeader* header = mcEvent->Header();
237	if (!header)
238	{
239	AliDebug(AliLog::kError, "Header not available");
240	return;
241	}
242
243	// post the output already here, because there are several exit possibilities below
244	PostData(0, fOutput);
245
246	if (fSelectProcessType > 0)
247	{
248	// getting process information; NB: this only works for Pythia
249	Int_t processtype = AliPWG0Helper::GetPythiaEventProcessType(header);
250
251	Bool_t processEvent = kFALSE;
252
253	// non diffractive
254	if (fSelectProcessType == 1 && processtype !=92 && processtype !=93 && processtype != 94)
255	processEvent = kTRUE;
256
257	// single diffractive
258	if (fSelectProcessType == 2 && (processtype == 92 \|\| processtype == 93))
259	processEvent = kTRUE;
260
261	// double diffractive
262	if (fSelectProcessType == 3 && processtype == 94)
263	processEvent = kTRUE;
264
265	if (!processEvent)
266	{
267	AliDebug(AliLog::kDebug, Form("Skipping this event, because it is not of the requested process type (%d)", processtype));
268	return;
269	}
270	}
271
272	Bool_t eventTriggered = AliPWG0Helper::IsEventTriggered(fESD->GetTriggerMask());
273	eventTriggered = kTRUE; // no generated trigger for the simulated events
274
275	Bool_t eventVertex = AliPWG0Helper::IsVertexReconstructed(fESD->GetVertex());
276
277	// get the ESD vertex
278	const AliESDVertex* vtxESD = fESD->GetVertex();
279	Double_t vtx[3];
280	vtxESD->GetXYZ(vtx);
281
282	// get the MC vertex
283	AliGenEventHeader* genHeader = header->GenEventHeader();
284	TArrayF vtxMC(3);
285	genHeader->PrimaryVertex(vtxMC);
286
287	// get tracklets
288	const AliMultiplicity* mult = fESD->GetMultiplicity();
289	if (!mult)
290	{
291	AliDebug(AliLog::kError, "AliMultiplicity not available");
292	return;
293	}
294
295	//const Float_t kPtCut = 0.3;
296
297	// get number of tracks from MC
298	// loop over mc particles
299	Int_t nPrim = stack->GetNprimary();
300	Int_t nMCPart = stack->GetNtrack();
301
302	// tracks in different eta ranges
303	Int_t nMCTracks05 = 0;
304	Int_t nMCTracks09 = 0;
305	Int_t nMCTracks15 = 0;
306	Int_t nMCTracks20 = 0;
307	Int_t nMCTracksAll = 0;
308
309	// tracks per particle species, in \|eta\| < 2 (systematic study)
310	Int_t nMCTracksSpecies[4]; // (pi, K, p, other)
311	for (Int_t i = 0; i<4; ++i)
312	nMCTracksSpecies[i] = 0;
313	// eta range for nMCTracksSpecies, nESDTracksSpecies
314	#ifdef ITSMEASUREMENT
315	const Float_t etaRange = 2.0;
316	#else
317	const Float_t etaRange = 0.9;
318	#endif
319
320	for (Int_t iMc = 0; iMc < nPrim; ++iMc)
321	{
322	AliDebug(AliLog::kDebug+1, Form("MC Loop: Processing particle %d.", iMc));
323
324	TParticle* particle = stack->Particle(iMc);
325
326	if (!particle)
327	{
328	AliDebug(AliLog::kError, Form("UNEXPECTED: particle with label %d not found in stack (mc loop).", iMc));
329	continue;
330	}
331
332	Bool_t debug = kFALSE;
333	if (AliPWG0Helper::IsPrimaryCharged(particle, nPrim, debug) == kFALSE)
334	{
335	//printf("%d) DROPPED ", iMC);
336	//particle->Print();
337	continue;
338	}
339
340	//printf("%d) OK ", iMC);
341	//particle->Print();
342
343	//if (particle->Pt() < kPtCut)
344	// continue;
345
346	Int_t particleWeight = 1;
347
348	Float_t pt = particle->Pt();
349
350	// in case of systematic study, weight according to the change of the pt spectrum
351	// it cannot be just multiplied because we cannot count "half of a particle"
352	// instead a random generator decides if the particle is counted twice (if value > 1)
353	// or not (if value < 0)
354	if (fPtSpectrum)
355	{
356	Int_t bin = fPtSpectrum->FindBin(pt);
357	if (bin > 0 && bin <= fPtSpectrum->GetNbinsX())
358	{
359	Float_t factor = fPtSpectrum->GetBinContent(bin);
360	if (factor > 0)
361	{
362	Float_t random = gRandom->Uniform();
363	if (factor > 1 && random < factor - 1)
364	{
365	particleWeight = 2;
366	}
367	else if (factor < 1 && random < 1 - factor)
368	particleWeight = 0;
369	}
370	}
371	}
372
373	//Printf("MC weight is: %d", particleWeight);
374
375	if (TMath::Abs(particle->Eta()) < 0.5)
376	nMCTracks05 += particleWeight;
377
378	if (TMath::Abs(particle->Eta()) < 0.9)
379	nMCTracks09 += particleWeight;
380
381	if (TMath::Abs(particle->Eta()) < 1.5)
382	nMCTracks15 += particleWeight;
383
384	if (TMath::Abs(particle->Eta()) < 2.0)
385	nMCTracks20 += particleWeight;
386
387	nMCTracksAll += particleWeight;
388
389	if (fParticleCorrection[0] \|\| fParticleSpecies)
390	{
391	Int_t id = -1;
392	switch (TMath::Abs(particle->GetPdgCode()))
393	{
394	case 211: id = 0; break;
395	case 321: id = 1; break;
396	case 2212: id = 2; break;
397	default: id = 3; break;
398	}
399	if (TMath::Abs(particle->Eta()) < etaRange)
400	nMCTracksSpecies[id]++;
401	if (fParticleCorrection[id])
402	fParticleCorrection[id]->GetTrackCorrection()->FillGene(vtxMC[2], particle->Eta(), particle->Pt());
403	}
404	}// end of mc particle
405
a9017e49	406	fMultiplicity->FillGenerated(vtxMC[2], eventTriggered, eventVertex, (Int_t) nMCTracks05, (Int_t) nMCTracks09, (Int_t) nMCTracks15, (Int_t) nMCTracks20, (Int_t) nMCTracksAll);
	407
	408	if (!eventTriggered \|\| !eventVertex)
	409	return;
	410
	411	Int_t nESDTracks05 = 0;
	412	Int_t nESDTracks09 = 0;
	413	Int_t nESDTracks15 = 0;
	414	Int_t nESDTracks20 = 0;
	415
	416	// tracks per particle species, in \|eta\| < 2 (systematic study)
	417	Int_t nESDTracksSpecies[7]; // (pi, K, p, other, nolabel, doublecount_prim, doublecount_all)
	418	for (Int_t i = 0; i<7; ++i)
	419	nESDTracksSpecies[i] = 0;
	420
	421	Bool_t* foundPrimaries = new Bool_t[nPrim]; // to prevent double counting
	422	for (Int_t i=0; i<nPrim; i++)
	423	foundPrimaries[i] = kFALSE;
	424
	425	Bool_t* foundTracks = new Bool_t[nMCPart]; // to prevent double counting
	426	for (Int_t i=0; i<nMCPart; i++)
	427	foundTracks[i] = kFALSE;
	428
	429	#ifdef ITSMEASUREMENT
	430	// get multiplicity from ITS tracklets
	431	for (Int_t i=0; i<mult->GetNumberOfTracklets(); ++i)
	432	{
	433	//printf("%d %f %f %f\n", i, mult->GetTheta(i), mult->GetPhi(i), mult->GetDeltaPhi(i));
	434
	435	// This removes non-tracklets in PDC06 data. Very bad solution. New solution is implemented for newer data. Keeping this for compatibility.
	436	if (mult->GetDeltaPhi(i) < -1000)
	437	continue;
	438
	439	// systematic study: 10% lower efficiency
	440	if (fSystSkipParticles && (gRandom->Uniform() < 0.1))
	441	continue;
	442
	443	Float_t theta = mult->GetTheta(i);
	444	Float_t eta = -TMath::Log(TMath::Tan(theta/2.));
	445
	446	// TODO define needed, because this only works with new AliRoot
	447	Int_t label = mult->GetLabel(i);
	448	#endif
	449	#ifdef TPCMEASUREMENT
	450	// get multiplicity from ESD tracks
	451	TObjArray* list = fEsdTrackCuts->GetAcceptedTracks(fESD);
	452	Int_t nGoodTracks = list->GetEntries();
	453	// loop over esd tracks
	454	for (Int_t i=0; i<nGoodTracks; i++)
	455	{
	456	AliESDtrack* esdTrack = dynamic_cast<AliESDtrack*> (list->At(i));
	457	if (!esdTrack)
	458	{
	459	AliDebug(AliLog::kError, Form("ERROR: Could not retrieve track %d.", i));
	460	continue;
	461	}
	462
	463	Double_t p[3];
	464	esdTrack->GetConstrainedPxPyPz(p);
	465	TVector3 vector(p);
	466
	467	Float_t theta = vector.Theta();
	468	Float_t eta = -TMath::Log(TMath::Tan(theta/2.));
	469
470	Int_t label = esdTrack->GetLabel();
471
472	//Float_t pt = vector.Pt();
473	//if (pt < kPtCut)
474	// continue;
475	#endif
476
477	Int_t particleWeight = 1;
478
479	// in case of systematic study, weight according to the change of the pt spectrum
480	if (fPtSpectrum)
481	{
482	TParticle* mother = 0;
483
484	// preserve label for later
485	Int_t labelCopy = label;
486	if (labelCopy >= 0)
487	labelCopy = AliPWG0Helper::FindPrimaryMotherLabel(stack, labelCopy);
488	if (labelCopy >= 0)
489	mother = stack->Particle(labelCopy);
490
491	// in case of pt study we do not count particles w/o label, because they cannot be scaled
492	if (!mother)
493	continue;
494
495	// it cannot be just multiplied because we cannot count "half of a particle"
496	// instead a random generator decides if the particle is counted twice (if value > 1)
497	// or not (if value < 0)
498	Int_t bin = fPtSpectrum->FindBin(mother->Pt());
499	if (bin > 0 && bin <= fPtSpectrum->GetNbinsX())
500	{
501	Float_t factor = fPtSpectrum->GetBinContent(bin);
502	if (factor > 0)
503	{
504	Float_t random = gRandom->Uniform();
505	if (factor > 1 && random < factor - 1)
506	{
507	particleWeight = 2;
508	}
509	else if (factor < 1 && random < 1 - factor)
510	particleWeight = 0;
511	}
512	}
513	}
514
515	//Printf("ESD weight is: %d", particleWeight);
516
517	if (TMath::Abs(eta) < 0.5)
518	nESDTracks05 += particleWeight;
519
520	if (TMath::Abs(eta) < 0.9)
521	nESDTracks09 += particleWeight;
522
523	if (TMath::Abs(eta) < 1.5)
524	nESDTracks15 += particleWeight;
525
526	if (TMath::Abs(eta) < 2.0)
527	nESDTracks20 += particleWeight;
528
529
530	if (fParticleCorrection[0] \|\| fParticleSpecies)
531	{
532	Int_t motherLabel = -1;
533	TParticle* mother = 0;
534
535	// find mother
536	if (label >= 0)
537	motherLabel = AliPWG0Helper::FindPrimaryMotherLabel(stack, label);
538	if (motherLabel >= 0)
539	mother = stack->Particle(motherLabel);
540
541	if (!mother)
542	{
543	// count tracks that did not have a label
544	if (TMath::Abs(eta) < etaRange)
545	nESDTracksSpecies[4]++;
546	continue;
547	}
548
549	// get particle type (pion, proton, kaon, other)
550	Int_t id = -1;
551	switch (TMath::Abs(mother->GetPdgCode()))
552	{
553	case 211: id = 0; break;
554	case 321: id = 1; break;
555	case 2212: id = 2; break;
556	default: id = 3; break;
557	}
558
559	// double counting is ok for particle ratio study
560	if (TMath::Abs(eta) < etaRange)
561	nESDTracksSpecies[id]++;
562
563	// double counting is not ok for efficiency study
564
565	// check if we already counted this particle, this way distinguishes double counted particles (bug/artefact in tracking) or double counted primaries due to secondaries (physics)
566	if (foundTracks[label])
567	{
568	if (TMath::Abs(eta) < etaRange)
569	nESDTracksSpecies[6]++;
570	continue;
571	}
572	foundTracks[label] = kTRUE;
573
574	// particle (primary) already counted?
575	if (foundPrimaries[motherLabel])
576	{
577	if (TMath::Abs(eta) < etaRange)
578	nESDTracksSpecies[5]++;
579	continue;
580	}
581	foundPrimaries[motherLabel] = kTRUE;
582
583	if (fParticleCorrection[id])
584	fParticleCorrection[id]->GetTrackCorrection()->FillMeas(vtxMC[2], mother->Eta(), mother->Pt());
585	}
586	}
587
588	delete[] foundTracks;
589	delete[] foundPrimaries;
590
591	if ((Int_t) nMCTracks20 == 0 && nESDTracks20 > 3)
592	printf("WARNING: Event has %d generated and %d reconstructed...\n", nMCTracks20, nESDTracks20);
593
594	//printf("%.2f generated and %.2f reconstructed\n", nMCTracks20, nESDTracks20);
595
596	//Printf("%f %f %f %f %f %f %f %f %f %f", vtxMC[2], nMCTracks05, nMCTracks09, nMCTracks15, nMCTracks20, nMCTracksAll, nESDTracks05, nESDTracks09, nESDTracks15, nESDTracks20);
597
598	//Printf("%f %f %f %f %f %f %f %f %f %f", vtxMC[2], nMCTracks05, nMCTracks09, nMCTracks15, nMCTracks20, nMCTracksAll, nESDTracks05, nESDTracks09, nESDTracks15, nESDTracks20);
599
600	fMultiplicity->FillMeasured(vtx[2], nESDTracks05, nESDTracks09, nESDTracks15, nESDTracks20);
601
602	// fill response matrix using vtxMC (best guess)
603	fMultiplicity->FillCorrection(vtxMC[2], nMCTracks05, nMCTracks09, nMCTracks15, nMCTracks20, nMCTracksAll, nESDTracks05, nESDTracks09, nESDTracks15, nESDTracks20);
604
605	if (fParticleSpecies)
606	fParticleSpecies->Fill(vtxMC[2], nMCTracksSpecies[0], nMCTracksSpecies[1], nMCTracksSpecies[2], nMCTracksSpecies[3], nESDTracksSpecies[0], nESDTracksSpecies[1], nESDTracksSpecies[2], nESDTracksSpecies[3], nESDTracksSpecies[4], nESDTracksSpecies[5], nESDTracksSpecies[6]);
607
608	//Printf("%d = %d %d %d %d %d %d %d", (Int_t) nESDTracks20, nESDTracksSpecies[0], nESDTracksSpecies[1], nESDTracksSpecies[2], nESDTracksSpecies[3], nESDTracksSpecies[4], nESDTracksSpecies[5], nESDTracksSpecies[6]);
609	}
610
611	void AliMultiplicityTask::Terminate(Option_t *)
612	{
613	// The Terminate() function is the last function to be called during
614	// a query. It always runs on the client, it can be used to present
615	// the results graphically or save the results to file.
616
617	fOutput = dynamic_cast<TList*> (GetOutputData(0));
618	if (!fOutput) {
619	Printf("ERROR: fOutput not available");
620	return;
621	}
622
623	fMultiplicity = dynamic_cast<AliMultiplicityCorrection*> (fOutput->FindObject("Multiplicity"));
624	for (Int_t i = 0; i < 4; ++i)
625	fParticleCorrection[i] = dynamic_cast<AliCorrection*> (fOutput->FindObject(Form("correction_%d", i)));
626	fParticleSpecies = dynamic_cast<TNtuple*> (fOutput->FindObject("fParticleSpecies"));
627
628	if (!fMultiplicity)
629	{
630	AliDebug(AliLog::kError, Form("ERROR: Histograms not available %p", (void*) fMultiplicity));
631	return;
632	}
633
634	TFile* file = TFile::Open("multiplicityMC.root", "RECREATE");
635
636	fMultiplicity->SaveHistograms();
637	for (Int_t i = 0; i < 4; ++i)
638	if (fParticleCorrection[i])
639	fParticleCorrection[i]->SaveHistograms();
640	if (fParticleSpecies)
641	fParticleSpecies->Write();
642
643	TObjString option(fOption);
644	option.Write();
645
646	file->Close();
647
648	Printf("Writting result to multiplicityMC.root");
649	}