[u/mrichter/AliRoot.git] / ANALYSIS / AliAnalysisTaskMCParticleFilter.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

//
//  Analysis task for Kinematic filtering
//  Fill AODtrackMC tracks from Kinematic stack
//
 
#include <TChain.h>
#include <TFile.h>
#include "TParticle.h"
#include "TParameter.h"
#include "TString.h"
#include "TList.h"
#include "TProfile.h"
#include "TH1F.h"


#include "AliAnalysisTaskMCParticleFilter.h"
#include "AliAnalysisManager.h"
#include "AliAnalysisFilter.h"
#include "AliHeader.h"
#include "AliStack.h"
#include "AliMCEvent.h"
#include "AliMCEventHandler.h"
#include "AliAODEvent.h"
#include "AliAODHeader.h"
#include "AliAODMCHeader.h"
#include "AliAODHandler.h"
#include "AliAODVertex.h"
#include "AliAODMCParticle.h"
#include "AliCollisionGeometry.h"
#include "AliGenDPMjetEventHeader.h"
#include "AliGenHijingEventHeader.h"
#include "AliGenPythiaEventHeader.h"
#include "AliGenCocktailEventHeader.h"

#include "AliLog.h"

ClassImp(AliAnalysisTaskMCParticleFilter)

////////////////////////////////////////////////////////////////////////

//____________________________________________________________________
AliAnalysisTaskMCParticleFilter::AliAnalysisTaskMCParticleFilter():
AliAnalysisTaskSE(),
  fTrackFilterMother(0x0),
  fHistList(0x0)
{
  // Default constructor
}

Bool_t AliAnalysisTaskMCParticleFilter::Notify()
{
  //
  // Implemented Notify() to read the cross sections
  // from pyxsec.root
  // 
  TTree *tree = AliAnalysisManager::GetAnalysisManager()->GetTree();
  Double_t xsection = 0;
  UInt_t   ntrials  = 0;
  if(tree){
    TFile *curfile = tree->GetCurrentFile();
    if (!curfile) {
      Error("Notify","No current file");
      return kFALSE;
    }

    TString fileName(curfile->GetName());
    if(fileName.Contains("AliESDs.root")){
        fileName.ReplaceAll("AliESDs.root", "pyxsec.root");
    }
    else if(fileName.Contains("AliAOD.root")){
        fileName.ReplaceAll("AliAOD.root", "pyxsec.root");
    }
    else if(fileName.Contains("galice.root")){
        // for running with galice and kinematics alone...                      
        fileName.ReplaceAll("galice.root", "pyxsec.root");
    }


    TFile *fxsec = TFile::Open(fileName.Data());
    if(!fxsec){
      AliInfo(Form("%s:%d %s not found in the Input",(char*)__FILE__,__LINE__,fileName.Data()));
      // not a severe condition we just do not have the information...
      return kTRUE;
    }
    TTree *xtree = (TTree*)fxsec->Get("Xsection");
    if(!xtree){
      Printf("%s:%d tree not found in the pyxsec.root",(char*)__FILE__,__LINE__);
      return kTRUE;
    }
    xtree->SetBranchAddress("xsection",&xsection);
    xtree->SetBranchAddress("ntrials",&ntrials);
    xtree->GetEntry(0);
    ((TProfile*)(fHistList->FindObject("h1Xsec")))->Fill("<#sigma>",xsection);
  }
  return kTRUE;
}


//____________________________________________________________________
AliAnalysisTaskMCParticleFilter::AliAnalysisTaskMCParticleFilter(const char* name):
    AliAnalysisTaskSE(name),
    fTrackFilterMother(0x0),
    fHistList(0x0)
{
  // Default constructor
  DefineOutput(1,TList::Class());  
}

/*
//____________________________________________________________________
AliAnalysisTaskMCParticleFilter::AliAnalysisTaskMCParticleFilter(const AliAnalysisTaskMCParticleFilter& obj):
    AliAnalysisTaskSE(obj),
    fTrackFilterMother(obj.fTrackFilterMother)
{
  // Copy constructor
}
*/
//____________________________________________________________________
AliAnalysisTaskMCParticleFilter::~AliAnalysisTaskMCParticleFilter()
{
  //  if( fTrackFilterMother ) delete fTrackFilterMother;
}

/*
//____________________________________________________________________
AliAnalysisTaskMCParticleFilter& AliAnalysisTaskMCParticleFilter::operator=(const AliAnalysisTaskMCParticleFilter& other)
{
// Assignment
  if(this!=&other) {
    AliAnalysisTaskSE::operator=(other);
    fTrackFilterMother = other.fTrackFilterMother;
  }
  return *this;
}
*/
//____________________________________________________________________
void AliAnalysisTaskMCParticleFilter::UserCreateOutputObjects()
{
  // Create the output container
    if (OutputTree()&&fTrackFilterMother) 
	OutputTree()->GetUserInfo()->Add(fTrackFilterMother);

    // this part is mainly needed to set the MCEventHandler
    // to the AODHandler, this will not be needed when
    // AODHandler goes to ANALYSISalice
    // setting in the steering macro will not work on proof :(
    // so we have to do it in a task

    // the branch booking can also go into the AODHandler then


    // mcparticles
    TClonesArray *tca = new TClonesArray("AliAODMCParticle", 0);
    tca->SetName(AliAODMCParticle::StdBranchName());
    AddAODBranch("TClonesArray",&tca);

    // MC header...
    AliAODMCHeader *mcHeader = new AliAODMCHeader();
    mcHeader->SetName(AliAODMCHeader::StdBranchName());
    AddAODBranch("AliAODMCHeader",&mcHeader);    

    
    AliMCEventHandler *mcH = (AliMCEventHandler*) ((AliAnalysisManager::GetAnalysisManager())->GetMCtruthEventHandler()); 
    AliAODHandler *aodH = dynamic_cast<AliAODHandler*> ((AliAnalysisManager::GetAnalysisManager())->GetOutputEventHandler());
    if(!aodH){
      Printf("%s:&d Could not get AODHandler",(char*)__FILE__,__LINE__);
      return;
    }
    aodH->SetMCEventHandler(mcH);


    // these are histograms, for averaging and summing
    // do it via histograms to be PROOF-proof
    // which merges the results from different workers
    // histos are not saved reside only in memory
    
    
    fHistList = new TList();
    TProfile *h1Xsec = new TProfile("h1Xsec","xsec from pyxsec.root",1,0,1);
    h1Xsec->GetXaxis()->SetBinLabel(1,"<#sigma>");
    fHistList->Add(h1Xsec);
    TH1F* h1Trials = new TH1F("h1Trials","trials from MC header",1,0,1);
    h1Trials->GetXaxis()->SetBinLabel(1,"#sum{ntrials}");
    fHistList->Add(h1Trials);

    
}

//____________________________________________________________________
void AliAnalysisTaskMCParticleFilter::UserExec(Option_t */*option*/)
{
// Execute analysis for current event
//

// Fill AOD tracks from Kinematic stack
    
  // get AliAOD Event 
  AliAODEvent* aod = AODEvent();
  if (!aod) {
      AliWarning("No Output Handler connected, doing nothing !") ;
      return;
  }

  AliMCEventHandler *mcH = (AliMCEventHandler*) ((AliAnalysisManager::GetAnalysisManager())->GetMCtruthEventHandler()); 
  if(!mcH){ 
    AliWarning("No MC handler Found");
    return;
  }


  // fetch the output 
  // Fill control histos

  // tmp array for holding the mctracks
  // need to set mother and duagther __before__
  // filling in the tree

  AliMCEvent *mcE = MCEvent();

  if(!mcE){
    AliWarning("No MC event Found");
    return;
  }

  Int_t np    = mcE->GetNumberOfTracks();
  Int_t nprim = mcE->GetNumberOfPrimaries();
  // TODO ADD MC VERTEX

  AliAODMCHeader *aodMCHo = (AliAODMCHeader *) aod->FindListObject("mcHeader");
  // Get the proper MC Collision Geometry
  AliGenEventHeader* mcEH = mcE->GenEventHeader();

  AliGenPythiaEventHeader *pyH = dynamic_cast<AliGenPythiaEventHeader*>(mcEH);
  AliGenHijingEventHeader *hiH = 0;
  AliCollisionGeometry *colG = 0;
  AliGenDPMjetEventHeader *dpmH = 0;
  // it can be only one save some casts
  // assuming PYTHIA and HIJING are the most likely ones...
  if(!pyH){
    hiH = dynamic_cast<AliGenHijingEventHeader*>(mcEH);
    if(!hiH){
      colG = dynamic_cast<AliCollisionGeometry *>(mcEH);
      if(!colG)dpmH = dynamic_cast<AliGenDPMjetEventHeader*>(mcEH);
    }
  }


  // fetch the trials on a event by event basis, not from pyxsec.root otherwise 
  // we will get a problem when running on proof since Notify may be called 
  // more than once per file
  // consider storing this information in the AOD output via AliAODHandler
  Float_t ntrials = 0;
  if (!colG) {
    AliGenCocktailEventHeader *ccEH = dynamic_cast<AliGenCocktailEventHeader *>(mcEH);
    if (ccEH) {
      TList *genHeaders = ccEH->GetHeaders();
      for (int imch=0; imch<genHeaders->GetEntries(); imch++) {
	if(!pyH)dynamic_cast<AliGenPythiaEventHeader*>(genHeaders->At(imch));
	if(!hiH)dynamic_cast<AliGenHijingEventHeader*>(genHeaders->At(imch));
	if(!colG)colG = dynamic_cast<AliCollisionGeometry *>(genHeaders->At(imch));
	if(!dpmH)dynamic_cast<AliGenDPMjetEventHeader*>(genHeaders->At(imch));
      }
    }
  }

  // take the trials from the p+p event
  if(hiH)ntrials = hiH->Trials();
  if(dpmH)ntrials = dpmH->Trials();
  if(pyH)ntrials = pyH->Trials();
  if(ntrials)((TH1F*)(fHistList->FindObject("h1Trials")))->Fill("#sum{ntrials}",ntrials); 
  

  if (colG) {
    aodMCHo->SetReactionPlaneAngle(colG->ReactionPlaneAngle());
    printf("Found Collision Geometry. Got Reaction Plane %lf\n", colG->ReactionPlaneAngle());
  }


  // check varibales for charm need all daughters
  static int  iTaken = 0;
  static int  iAll = 0;
  static int  iCharm = 0;


  Int_t j=0;
  for (Int_t ip = 0; ip < np; ip++){
    AliMCParticle* mcpart = (AliMCParticle*) mcE->GetTrack(ip);
    TParticle* part = mcpart->Particle();
    Float_t xv = part->Vx();
    Float_t yv = part->Vy();
    Float_t zv = part->Vz();
    Float_t rv = TMath::Sqrt(xv * xv + yv * yv);
      
    Bool_t write = kFALSE;
    
    if (ip < nprim) {
      // Select the primary event
      write = kTRUE;
    } else if (part->GetUniqueID() == 4) {
      // Particles from decay
      // Check that the decay chain ends at a primary particle
      AliMCParticle* mother = mcpart;
      Int_t imo = mcpart->GetMother();
      while((imo >= nprim) && (mother->GetUniqueID() == 4)) {
	mother =  (AliMCParticle*) mcE->GetTrack(imo);
	imo =  mother->GetMother();
      }
      // Select according to pseudorapidity and production point of primary ancestor
      if (imo < nprim && Select(((AliMCParticle*) mcE->GetTrack(imo))->Particle(), rv, zv))write = kTRUE;         
    } else if (part->GetUniqueID() == 5) {
      // Now look for pair production
      Int_t imo = mcpart->GetMother();
      if (imo < nprim) {
	// Select, if the gamma is a primary
	write = kTRUE;
      } else {
	// Check if the gamma comes from the decay chain of a primary particle
	AliMCParticle* mother =  (AliMCParticle*) mcE->GetTrack(imo);
	imo = mother->GetMother();
	while((imo >= nprim) && (mother->GetUniqueID() == 4)) {
	  mother =   (AliMCParticle*) mcE->GetTrack(imo);
	  imo =  mother->GetMother();
	}
	// Select according to pseudorapidity and production point 
	if (imo < nprim && Select(mother->Particle(), rv, zv)) 
	  write = kTRUE;
      }
    }
    /*
    else if (part->GetUniqueID() == 13){
      // Evaporation
      // Check that we end at a primary particle
      TParticle* mother = part;
      Int_t imo = part->GetFirstMother();
      while((imo >= nprim) && ((mother->GetUniqueID() == 4 ) || ( mother->GetUniqueID() == 13))) {
	mother =  mcE->Stack()->Particle(imo);
	imo =  mother->GetFirstMother();
      }
      // Select according to pseudorapidity and production point 
	if (imo < nprim && Select(mother, rv, zv)) 
	  write = kTRUE;
    }
    */    
    if (write) {
      if(mcH)mcH->SelectParticle(ip);
      j++;
      
      // debug info to check fro charm daugthers
      if((TMath::Abs(part->GetPdgCode()))==411){
	iCharm++;
	Int_t d0 =  mcpart->GetFirstDaughter();
	Int_t d1 =  mcpart->GetLastDaughter();
	if(d0>0&&d1>0){
	  for(int id = d0;id <= d1;id++){
	    iAll++;
	    if(mcH->IsParticleSelected(id))iTaken++;
	  }
	}
      }// if charm
    }
  }

  AliInfo(Form("Taken daughters %d/%d of %d charm",iTaken,iAll,iCharm));

  PostData(1,fHistList);

  return;
}

void AliAnalysisTaskMCParticleFilter::Terminate(Option_t */*option*/){
  //
  // Terminate the execution save the PYTHIA x_section to the UserInfo()
  //


  TTree *tree = (TTree*)GetOutputData(0);
  fHistList = (TList*)GetOutputData(1);
  if(!fHistList){
    Printf("%s:%d Output list not found",(char*)__FILE__,__LINE__);
    return;
  }

  if(!tree){
    Printf("%s:%d Output tree not found",(char*)__FILE__,__LINE__);
    return;
  }

  TProfile *hXsec = ((TProfile*)(fHistList->FindObject("h1Xsec")));
  TH1F* hTrials  = ((TH1F*)(fHistList->FindObject("h1Trials")));
  if(!hXsec)return;
  if(!hTrials)return;

  Float_t xsec = hXsec->GetBinContent(1);
  Float_t trials = hTrials->Integral();
  AliInfo(Form("Average -section %.4E and total number of trials %E",xsec,trials));
  
  // This only works if the tree is not a special output
  // in this case it is already written
  /*
  TParameter<float> *x = new TParameter<float>("xsection",xsec);
  tree->GetUserInfo()->Add(x);
  TParameter<float> *t = new TParameter<float>("trials",trials);
  tree->GetUserInfo()->Add(t);
  */
  

}

Bool_t AliAnalysisTaskMCParticleFilter::Select(TParticle* part, Float_t rv, Float_t zv)
{
  // Selection accoring to eta of the mother and production point
  // This has to be refined !!!!!!

  // Esp if we don't have collisison in the central barrel but e.g. beam gas
  //  return kTRUE;

  Float_t eta = part->Eta();

  // central barrel consider everything in the ITS...
  // large eta window for smeared vertex and SPD acceptance (2 at z = 0)
  // larger for V0s in the TPC
  //  if (TMath::Abs(eta) < 2.5 && rv < 250. && TMath::Abs(zv)<255)return kTRUE;

  if (TMath::Abs(eta) < 2.5 && rv < 170)return kTRUE;   

  // Andreas' Cuts
  //  if (TMath::Abs(eta) < 1. && rv < 170)return kTRUE;   


  // Muon arm
  if(eta > -4.2 && eta < -2.3 && zv > -500.)return kTRUE; // Muon arms

  // PMD acceptance 2.3 <= eta < = 3.5
  //  if(eta>2.0&&eta<3.7)return kTRUE; 

  return kFALSE;
 
}
Commit	Line	Data
da97a08a	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
	16	//
	17	// Analysis task for Kinematic filtering
	18	// Fill AODtrackMC tracks from Kinematic stack
	19	//
	20
	21	#include <TChain.h>
	22	#include <TFile.h>
	23	#include "TParticle.h"
a3b51fd2	24	#include "TParameter.h"
da97a08a	25	#include "TString.h"
a3b51fd2	26	#include "TList.h"
	27	#include "TProfile.h"
	28	#include "TH1F.h"
	29
da97a08a	30
	31	#include "AliAnalysisTaskMCParticleFilter.h"
	32	#include "AliAnalysisManager.h"
	33	#include "AliAnalysisFilter.h"
	34	#include "AliHeader.h"
	35	#include "AliStack.h"
	36	#include "AliMCEvent.h"
	37	#include "AliMCEventHandler.h"
	38	#include "AliAODEvent.h"
	39	#include "AliAODHeader.h"
dce1b636	40	#include "AliAODMCHeader.h"
da97a08a	41	#include "AliAODHandler.h"
	42	#include "AliAODVertex.h"
	43	#include "AliAODMCParticle.h"
e988332e	44	#include "AliCollisionGeometry.h"
c4b2bb17	45	#include "AliGenDPMjetEventHeader.h"
	46	#include "AliGenHijingEventHeader.h"
	47	#include "AliGenPythiaEventHeader.h"
e988332e	48	#include "AliGenCocktailEventHeader.h"
da97a08a	49
	50	#include "AliLog.h"
	51
	52	ClassImp(AliAnalysisTaskMCParticleFilter)
	53
	54	////////////////////////////////////////////////////////////////////////
	55
	56	//____________________________________________________________________
	57	AliAnalysisTaskMCParticleFilter::AliAnalysisTaskMCParticleFilter():
	58	AliAnalysisTaskSE(),
a3b51fd2	59	fTrackFilterMother(0x0),
a3b51fd2	60	fHistList(0x0)
da97a08a	61	{
	62	// Default constructor
	63	}
	64
a3b51fd2	65	Bool_t AliAnalysisTaskMCParticleFilter::Notify()
	66	{
	67	//
	68	// Implemented Notify() to read the cross sections
c4b2bb17	69	// from pyxsec.root
a3b51fd2	70	//
	71	TTree *tree = AliAnalysisManager::GetAnalysisManager()->GetTree();
	72	Double_t xsection = 0;
	73	UInt_t ntrials = 0;
	74	if(tree){
	75	TFile *curfile = tree->GetCurrentFile();
	76	if (!curfile) {
	77	Error("Notify","No current file");
	78	return kFALSE;
	79	}
	80
	81	TString fileName(curfile->GetName());
	82	if(fileName.Contains("AliESDs.root")){
	83	fileName.ReplaceAll("AliESDs.root", "pyxsec.root");
	84	}
	85	else if(fileName.Contains("AliAOD.root")){
	86	fileName.ReplaceAll("AliAOD.root", "pyxsec.root");
	87	}
	88	else if(fileName.Contains("galice.root")){
	89	// for running with galice and kinematics alone...
	90	fileName.ReplaceAll("galice.root", "pyxsec.root");
	91	}
	92
	93
	94	TFile *fxsec = TFile::Open(fileName.Data());
	95	if(!fxsec){
	96	AliInfo(Form("%s:%d %s not found in the Input",(char*)__FILE__,__LINE__,fileName.Data()));
	97	// not a severe condition we just do not have the information...
	98	return kTRUE;
	99	}
	100	TTree xtree = (TTree)fxsec->Get("Xsection");
	101	if(!xtree){
	102	Printf("%s:%d tree not found in the pyxsec.root",(char*)__FILE__,__LINE__);
	103	return kTRUE;
	104	}
	105	xtree->SetBranchAddress("xsection",&xsection);
	106	xtree->SetBranchAddress("ntrials",&ntrials);
	107	xtree->GetEntry(0);
	108	((TProfile*)(fHistList->FindObject("h1Xsec")))->Fill("<#sigma>",xsection);
a3b51fd2	109	}
	110	return kTRUE;
	111	}
	112
	113
	114
da97a08a	115	//____________________________________________________________________
	116	AliAnalysisTaskMCParticleFilter::AliAnalysisTaskMCParticleFilter(const char* name):
	117	AliAnalysisTaskSE(name),
a3b51fd2	118	fTrackFilterMother(0x0),
a3b51fd2	119	fHistList(0x0)
da97a08a	120	{
da97a08a	121	// Default constructor
a3b51fd2	122	DefineOutput(1,TList::Class());
da97a08a	123	}
da97a08a	124
a3b51fd2	125	/*
da97a08a	126	//____________________________________________________________________
	127	AliAnalysisTaskMCParticleFilter::AliAnalysisTaskMCParticleFilter(const AliAnalysisTaskMCParticleFilter& obj):
	128	AliAnalysisTaskSE(obj),
	129	fTrackFilterMother(obj.fTrackFilterMother)
	130	{
	131	// Copy constructor
	132	}
a3b51fd2	133	*/
da97a08a	134	//____________________________________________________________________
	135	AliAnalysisTaskMCParticleFilter::~AliAnalysisTaskMCParticleFilter()
	136	{
	137	// if( fTrackFilterMother ) delete fTrackFilterMother;
	138	}
	139
a3b51fd2	140	/*
da97a08a	141	//____________________________________________________________________
	142	AliAnalysisTaskMCParticleFilter& AliAnalysisTaskMCParticleFilter::operator=(const AliAnalysisTaskMCParticleFilter& other)
	143	{
	144	// Assignment
	145	if(this!=&other) {
	146	AliAnalysisTaskSE::operator=(other);
	147	fTrackFilterMother = other.fTrackFilterMother;
	148	}
	149	return *this;
	150	}
a3b51fd2	151	*/
da97a08a	152	//____________________________________________________________________
	153	void AliAnalysisTaskMCParticleFilter::UserCreateOutputObjects()
	154	{
	155	// Create the output container
	156	if (OutputTree()&&fTrackFilterMother)
	157	OutputTree()->GetUserInfo()->Add(fTrackFilterMother);
d2740fba	158
	159	// this part is mainly needed to set the MCEventHandler
	160	// to the AODHandler, this will not be needed when
	161	// AODHandler goes to ANALYSISalice
	162	// setting in the steering macro will not work on proof :(
	163	// so we have to do it in a task
	164
	165	// the branch booking can also go into the AODHandler then
	166
dce1b636	167
dce1b636	168	// mcparticles
da97a08a	169	TClonesArray *tca = new TClonesArray("AliAODMCParticle", 0);
	170	tca->SetName(AliAODMCParticle::StdBranchName());
	171	AddAODBranch("TClonesArray",&tca);
da97a08a	172
dce1b636	173	// MC header...
dce1b636	174	AliAODMCHeader *mcHeader = new AliAODMCHeader();
dce1b636	175	mcHeader->SetName(AliAODMCHeader::StdBranchName());
	176	AddAODBranch("AliAODMCHeader",&mcHeader);
	177
	178
	179
	180	AliMCEventHandler mcH = (AliMCEventHandler) ((AliAnalysisManager::GetAnalysisManager())->GetMCtruthEventHandler());
da97a08a	181	AliAODHandler aodH = dynamic_cast<AliAODHandler> ((AliAnalysisManager::GetAnalysisManager())->GetOutputEventHandler());
	182	if(!aodH){
	183	Printf("%s:&d Could not get AODHandler",(char*)__FILE__,__LINE__);
	184	return;
	185	}
	186	aodH->SetMCEventHandler(mcH);
dce1b636	187
a3b51fd2	188
	189	// these are histograms, for averaging and summing
	190	// do it via histograms to be PROOF-proof
	191	// which merges the results from different workers
	192	// histos are not saved reside only in memory
	193
	194
	195
	196	fHistList = new TList();
	197	TProfile *h1Xsec = new TProfile("h1Xsec","xsec from pyxsec.root",1,0,1);
	198	h1Xsec->GetXaxis()->SetBinLabel(1,"<#sigma>");
	199	fHistList->Add(h1Xsec);
c4b2bb17	200	TH1F* h1Trials = new TH1F("h1Trials","trials from MC header",1,0,1);
a3b51fd2	201	h1Trials->GetXaxis()->SetBinLabel(1,"#sum{ntrials}");
	202	fHistList->Add(h1Trials);
	203
da97a08a	204
	205	}
	206
	207	//____________________________________________________________________
	208	void AliAnalysisTaskMCParticleFilter::UserExec(Option_t /option*/)
	209	{
	210	// Execute analysis for current event
	211	//
	212
	213	// Fill AOD tracks from Kinematic stack
	214
	215	// get AliAOD Event
	216	AliAODEvent* aod = AODEvent();
	217	if (!aod) {
	218	AliWarning("No Output Handler connected, doing nothing !") ;
	219	return;
	220	}
	221
	222	AliMCEventHandler mcH = (AliMCEventHandler) ((AliAnalysisManager::GetAnalysisManager())->GetMCtruthEventHandler());
	223	if(!mcH){
	224	AliWarning("No MC handler Found");
	225	return;
	226	}
	227
	228
	229	// fetch the output
	230	// Fill control histos
	231
	232	// tmp array for holding the mctracks
	233	// need to set mother and duagther __before__
	234	// filling in the tree
	235
	236	AliMCEvent *mcE = MCEvent();
	237
	238	if(!mcE){
	239	AliWarning("No MC event Found");
	240	return;
	241	}
	242
da97a08a	243	Int_t np = mcE->GetNumberOfTracks();
93836e1b	244	Int_t nprim = mcE->GetNumberOfPrimaries();
da97a08a	245	// TODO ADD MC VERTEX
e988332e	246
e988332e	247	AliAODMCHeader aodMCHo = (AliAODMCHeader ) aod->FindListObject("mcHeader");
e988332e	248	// Get the proper MC Collision Geometry
e988332e	249	AliGenEventHeader* mcEH = mcE->GenEventHeader();
e988332e	250
c4b2bb17	251	AliGenPythiaEventHeader pyH = dynamic_cast<AliGenPythiaEventHeader>(mcEH);
	252	AliGenHijingEventHeader *hiH = 0;
	253	AliCollisionGeometry *colG = 0;
	254	AliGenDPMjetEventHeader *dpmH = 0;
	255	// it can be only one save some casts
	256	// assuming PYTHIA and HIJING are the most likely ones...
	257	if(!pyH){
	258	hiH = dynamic_cast<AliGenHijingEventHeader*>(mcEH);
	259	if(!hiH){
	260	colG = dynamic_cast<AliCollisionGeometry *>(mcEH);
	261	if(!colG)dpmH = dynamic_cast<AliGenDPMjetEventHeader*>(mcEH);
	262	}
	263	}
	264
	265
	266	// fetch the trials on a event by event basis, not from pyxsec.root otherwise
	267	// we will get a problem when running on proof since Notify may be called
	268	// more than once per file
	269	// consider storing this information in the AOD output via AliAODHandler
	270	Float_t ntrials = 0;
e988332e	271	if (!colG) {
	272	AliGenCocktailEventHeader ccEH = dynamic_cast<AliGenCocktailEventHeader >(mcEH);
	273	if (ccEH) {
	274	TList *genHeaders = ccEH->GetHeaders();
	275	for (int imch=0; imch<genHeaders->GetEntries(); imch++) {
c4b2bb17	276	if(!pyH)dynamic_cast<AliGenPythiaEventHeader*>(genHeaders->At(imch));
	277	if(!hiH)dynamic_cast<AliGenHijingEventHeader*>(genHeaders->At(imch));
	278	if(!colG)colG = dynamic_cast<AliCollisionGeometry *>(genHeaders->At(imch));
	279	if(!dpmH)dynamic_cast<AliGenDPMjetEventHeader*>(genHeaders->At(imch));
e988332e	280	}
	281	}
	282	}
	283
c4b2bb17	284	// take the trials from the p+p event
c4b2bb17	285	if(hiH)ntrials = hiH->Trials();
5ae590c4	286	if(dpmH)ntrials = dpmH->Trials();
c4b2bb17	287	if(pyH)ntrials = pyH->Trials();
	288	if(ntrials)((TH1F*)(fHistList->FindObject("h1Trials")))->Fill("#sum{ntrials}",ntrials);
	289
	290
	291
	292
e988332e	293	if (colG) {
	294	aodMCHo->SetReactionPlaneAngle(colG->ReactionPlaneAngle());
	295	printf("Found Collision Geometry. Got Reaction Plane %lf\n", colG->ReactionPlaneAngle());
	296	}
	297
de514cf0	298
	299
	300	// check varibales for charm need all daughters
	301	static int iTaken = 0;
	302	static int iAll = 0;
	303	static int iCharm = 0;
da97a08a	304
da97a08a	305
da97a08a	306	Int_t j=0;
da97a08a	307	for (Int_t ip = 0; ip < np; ip++){
7aad0c47	308	AliMCParticle* mcpart = (AliMCParticle*) mcE->GetTrack(ip);
da97a08a	309	TParticle* part = mcpart->Particle();
da97a08a	310	Float_t xv = part->Vx();
	311	Float_t yv = part->Vy();
	312	Float_t zv = part->Vz();
	313	Float_t rv = TMath::Sqrt(xv * xv + yv * yv);
	314
	315	Bool_t write = kFALSE;
63892dd0	316
da97a08a	317	if (ip < nprim) {
	318	// Select the primary event
	319	write = kTRUE;
	320	} else if (part->GetUniqueID() == 4) {
	321	// Particles from decay
	322	// Check that the decay chain ends at a primary particle
93836e1b	323	AliMCParticle* mother = mcpart;
93836e1b	324	Int_t imo = mcpart->GetMother();
da97a08a	325	while((imo >= nprim) && (mother->GetUniqueID() == 4)) {
7aad0c47	326	mother = (AliMCParticle*) mcE->GetTrack(imo);
93836e1b	327	imo = mother->GetMother();
da97a08a	328	}
63892dd0	329	// Select according to pseudorapidity and production point of primary ancestor
7aad0c47	330	if (imo < nprim && Select(((AliMCParticle*) mcE->GetTrack(imo))->Particle(), rv, zv))write = kTRUE;
da97a08a	331	} else if (part->GetUniqueID() == 5) {
da97a08a	332	// Now look for pair production
93836e1b	333	Int_t imo = mcpart->GetMother();
da97a08a	334	if (imo < nprim) {
	335	// Select, if the gamma is a primary
	336	write = kTRUE;
	337	} else {
	338	// Check if the gamma comes from the decay chain of a primary particle
7aad0c47	339	AliMCParticle* mother = (AliMCParticle*) mcE->GetTrack(imo);
93836e1b	340	imo = mother->GetMother();
da97a08a	341	while((imo >= nprim) && (mother->GetUniqueID() == 4)) {
7aad0c47	342	mother = (AliMCParticle*) mcE->GetTrack(imo);
93836e1b	343	imo = mother->GetMother();
da97a08a	344	}
da97a08a	345	// Select according to pseudorapidity and production point
93836e1b	346	if (imo < nprim && Select(mother->Particle(), rv, zv))
da97a08a	347	write = kTRUE;
	348	}
	349	}
	350	/*
	351	else if (part->GetUniqueID() == 13){
	352	// Evaporation
	353	// Check that we end at a primary particle
	354	TParticle* mother = part;
	355	Int_t imo = part->GetFirstMother();
	356	while((imo >= nprim) && ((mother->GetUniqueID() == 4 ) \|\| ( mother->GetUniqueID() == 13))) {
	357	mother = mcE->Stack()->Particle(imo);
	358	imo = mother->GetFirstMother();
	359	}
	360	// Select according to pseudorapidity and production point
	361	if (imo < nprim && Select(mother, rv, zv))
	362	write = kTRUE;
	363	}
	364	*/
	365	if (write) {
	366	if(mcH)mcH->SelectParticle(ip);
	367	j++;
de514cf0	368
	369	// debug info to check fro charm daugthers
	370	if((TMath::Abs(part->GetPdgCode()))==411){
	371	iCharm++;
	372	Int_t d0 = mcpart->GetFirstDaughter();
	373	Int_t d1 = mcpart->GetLastDaughter();
	374	if(d0>0&&d1>0){
	375	for(int id = d0;id <= d1;id++){
	376	iAll++;
	377	if(mcH->IsParticleSelected(id))iTaken++;
	378	}
63892dd0	379	}
de514cf0	380	}// if charm
63892dd0	381	}
63892dd0	382	}
a3c57861	383
a3c57861	384	AliInfo(Form("Taken daughters %d/%d of %d charm",iTaken,iAll,iCharm));
63892dd0	385
a3b51fd2	386	PostData(1,fHistList);
63892dd0	387
da97a08a	388	return;
	389	}
	390
a3b51fd2	391	void AliAnalysisTaskMCParticleFilter::Terminate(Option_t /option*/){
	392	//
	393	// Terminate the execution save the PYTHIA x_section to the UserInfo()
	394	//
	395
	396
	397	TTree tree = (TTree)GetOutputData(0);
	398	fHistList = (TList*)GetOutputData(1);
	399	if(!fHistList){
	400	Printf("%s:%d Output list not found",(char*)__FILE__,__LINE__);
	401	return;
	402	}
	403
	404	if(!tree){
	405	Printf("%s:%d Output tree not found",(char*)__FILE__,__LINE__);
	406	return;
	407	}
	408
	409	TProfile hXsec = ((TProfile)(fHistList->FindObject("h1Xsec")));
	410	TH1F* hTrials = ((TH1F*)(fHistList->FindObject("h1Trials")));
	411	if(!hXsec)return;
	412	if(!hTrials)return;
	413
	414	Float_t xsec = hXsec->GetBinContent(1);
	415	Float_t trials = hTrials->Integral();
	416	AliInfo(Form("Average -section %.4E and total number of trials %E",xsec,trials));
	417
	418	// This only works if the tree is not a special output
	419	// in this case it is already written
	420	/*
	421	TParameter<float> *x = new TParameter<float>("xsection",xsec);
	422	tree->GetUserInfo()->Add(x);
	423	TParameter<float> *t = new TParameter<float>("trials",trials);
	424	tree->GetUserInfo()->Add(t);
	425	*/
	426
	427
	428	}
	429
da97a08a	430	Bool_t AliAnalysisTaskMCParticleFilter::Select(TParticle* part, Float_t rv, Float_t zv)
	431	{
	432	// Selection accoring to eta of the mother and production point
	433	// This has to be refined !!!!!!
	434
	435	// Esp if we don't have collisison in the central barrel but e.g. beam gas
	436	// return kTRUE;
	437
	438	Float_t eta = part->Eta();
	439
	440	// central barrel consider everything in the ITS...
	441	// large eta window for smeared vertex and SPD acceptance (2 at z = 0)
	442	// larger for V0s in the TPC
	443	// if (TMath::Abs(eta) < 2.5 && rv < 250. && TMath::Abs(zv)<255)return kTRUE;
	444
63892dd0	445	if (TMath::Abs(eta) < 2.5 && rv < 170)return kTRUE;
63892dd0	446
da97a08a	447	// Andreas' Cuts
63892dd0	448	// if (TMath::Abs(eta) < 1. && rv < 170)return kTRUE;
	449
	450
da97a08a	451
	452	// Muon arm
	453	if(eta > -4.2 && eta < -2.3 && zv > -500.)return kTRUE; // Muon arms
	454
	455	// PMD acceptance 2.3 <= eta < = 3.5
	456	// if(eta>2.0&&eta<3.7)return kTRUE;
	457
	458	return kFALSE;
	459
	460	}
	461