[u/mrichter/AliRoot.git] / PWGHF / vertexingHF / AliVertexingHFUtils.cxx

/**************************************************************************
 * Copyright(c) 2007-2009, 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.                  *
 **************************************************************************/

#include <TMath.h>
#include <TRandom.h>
#include <TProfile.h>
#include <TClonesArray.h>
#include <TH1F.h>
#include <TH2F.h>
#include <TF1.h>
#include "AliAODEvent.h"
#include "AliAODMCHeader.h"
#include "AliAODMCParticle.h"
#include "AliAODRecoDecayHF.h"
#include "AliVertexingHFUtils.h"

/* $Id$ */

///////////////////////////////////////////////////////////////////
//                                                               //
// Class with functions useful for different D2H analyses        //
// - event plane resolution                                      //
// - <pt> calculation with side band subtraction                 //
// - tracklet multiplicity calculation                            //
// Origin: F.Prino, Torino, prino@to.infn.it                     //
//                                                               //
///////////////////////////////////////////////////////////////////

ClassImp(AliVertexingHFUtils)

//______________________________________________________________________
AliVertexingHFUtils::AliVertexingHFUtils():TObject(),
  fK(1),
  fSubRes(1.),
  fMinEtaForTracklets(-1.),
  fMaxEtaForTracklets(1.)
{
  // Default contructor
}


//______________________________________________________________________
AliVertexingHFUtils::AliVertexingHFUtils(Int_t k):
  TObject(),
  fK(k),
  fSubRes(1.),
  fMinEtaForTracklets(-1.),
  fMaxEtaForTracklets(1.)
{
  // Standard constructor
}


//______________________________________________________________________
void AliVertexingHFUtils::ComputeSignificance(Double_t signal, Double_t  errsignal, Double_t  background, Double_t  errbackground, Double_t &significance,Double_t &errsignificance){
  // calculate significance from S, B and errors


  Double_t errSigSq=errsignal*errsignal;
  Double_t errBkgSq=errbackground*errbackground;
  Double_t sigPlusBkg=signal+background;
  if(sigPlusBkg>0. && signal>0.){
    significance =  signal/TMath::Sqrt(signal+background);
    errsignificance = significance*TMath::Sqrt((errSigSq+errBkgSq)/(4.*sigPlusBkg*sigPlusBkg)+(background/sigPlusBkg)*errSigSq/signal/signal);
  }else{
    significance=0.;
    errsignificance=0.;
  }
  return;

}
//______________________________________________________________________
Double_t AliVertexingHFUtils::Pol(Double_t x, Int_t k){
  // compute chi from polynomial approximation
  Double_t c[5];
  if(k==1){ 
    c[0]=0.626657; c[1]=0.; c[2]=-0.09694; c[3]=0.02754; c[4]=-0.002283;
  }
  else if(k==2){
    c[0]=0.; c[1]=0.25; c[2]=-0.011414; c[3]=-0.034726; c[4]=0.006815;
  }
  else return -1;
  return c[0]*x+c[1]*x*x+c[2]*x*x*x+c[3]*x*x*x*x+c[4]*x*x*x*x*x;
}

//______________________________________________________________________
Double_t AliVertexingHFUtils:: ResolK1(Double_t x){
  return TMath::Sqrt(TMath::Pi()/8)*x*TMath::Exp(-x*x/4)*(TMath::BesselI0(x*x/4)+TMath::BesselI1(x*x/4));
}


//______________________________________________________________________
Double_t AliVertexingHFUtils::FindChi(Double_t res,  Int_t k){
  // compute chi variable (=v2*sqrt(N)) from external values

  Double_t x1=0;
  Double_t x2=15;
  Double_t y1,y2;
  if(k==1){
    y1=ResolK1(x1)-res;
    y2=ResolK1(x2)-res;
  }
  else if(k==2){
    y1=Pol(x1,2)-res;
    y2=Pol(x2,2)-res;
  }
  else return -1;

  if(y1*y2>0) return -1;
  if(y1==0) return y1;
  if(y2==0) return y2;
  Double_t xmed,ymed;
  Int_t jiter=0;
  while((x2-x1)>0.0001){
    xmed=0.5*(x1+x2);
    if(k==1){
      y1=ResolK1(x1)-res;
      y2=ResolK1(x2)-res;
      ymed=ResolK1(xmed)-res;
    }
    else if(k==2){
      y1=Pol(x1,2)-res;
      y2=Pol(x2,2)-res;
      ymed=Pol(xmed,2)-res;
    }
    else return -1;
    if((y1*ymed)<0) x2=xmed;
    if((y2*ymed)<0)x1=xmed;
    if(ymed==0) return xmed;
    jiter++;
  }
  return 0.5*(x1+x2);
}

//______________________________________________________________________
Double_t AliVertexingHFUtils::GetFullEvResol(Double_t resSub, Int_t k){
  // computes event plane resolution starting from sub event resolution
  Double_t chisub=FindChi(resSub,k);
  Double_t chifull=chisub*TMath::Sqrt(2);
  if(k==1) return ResolK1(chifull);
  else if(k==2) return Pol(chifull,2);
  else{
    printf("k should be <=2\n");
    return 1.;
  }
}

//______________________________________________________________________
Double_t AliVertexingHFUtils::GetFullEvResol(const TH1F* hSubEvCorr, Int_t k){
  // computes event plane resolution starting from sub event correlation histogram
  if(!hSubEvCorr) return 1.;
  Double_t resSub=GetSubEvResol(hSubEvCorr);
  return GetFullEvResol(resSub,k);
}
//______________________________________________________________________
Double_t AliVertexingHFUtils::GetFullEvResolLowLim(const TH1F* hSubEvCorr, Int_t k){
  // computes low limit event plane resolution starting from sub event correlation histogram
  if(!hSubEvCorr) return 1.;
  Double_t resSub=GetSubEvResolLowLim(hSubEvCorr);
  printf("%f\n",resSub);
  return GetFullEvResol(resSub,k);  
}
//______________________________________________________________________
Double_t AliVertexingHFUtils::GetFullEvResolHighLim(const TH1F* hSubEvCorr, Int_t k){
  // computes high limit event plane resolution starting from sub event correlation histogram
  if(!hSubEvCorr) return 1.;
  Double_t resSub=GetSubEvResolHighLim(hSubEvCorr);
  printf("%f\n",resSub);
  return GetFullEvResol(resSub,k);  
}
//______________________________________________________________________
Int_t AliVertexingHFUtils::GetNumberOfTrackletsInEtaRange(AliAODEvent* ev, Double_t mineta, Double_t maxeta){
  // counts tracklets in given eta range
  AliAODTracklets* tracklets=ev->GetTracklets();
  Int_t nTr=tracklets->GetNumberOfTracklets();
  Int_t count=0;
  for(Int_t iTr=0; iTr<nTr; iTr++){
    Double_t theta=tracklets->GetTheta(iTr);
    Double_t eta=-TMath::Log(TMath::Tan(theta/2.));
    if(eta>mineta && eta<maxeta) count++;
  }
  return count;
}
//______________________________________________________________________
Int_t AliVertexingHFUtils::GetGeneratedMultiplicityInEtaRange(TClonesArray* arrayMC, Double_t mineta, Double_t maxeta){
  // counts generated particles in fgiven eta range

  Int_t nChargedMC=0;
  for(Int_t i=0;i<arrayMC->GetEntriesFast();i++){
    AliAODMCParticle *part=(AliAODMCParticle*)arrayMC->UncheckedAt(i);
    Int_t charge = part->Charge();
    Double_t eta = part->Eta();
    if(charge!=0 && eta>mineta && eta<maxeta) nChargedMC++;
  } 
  return nChargedMC;
}
//______________________________________________________________________
Int_t AliVertexingHFUtils::GetGeneratedPrimariesInEtaRange(TClonesArray* arrayMC, Double_t mineta, Double_t maxeta){
  // counts generated primary particles in given eta range

  Int_t nChargedMC=0;
  for(Int_t i=0;i<arrayMC->GetEntriesFast();i++){
    AliAODMCParticle *part=(AliAODMCParticle*)arrayMC->UncheckedAt(i);
    Int_t charge = part->Charge();
    Double_t eta = part->Eta();
    if(charge!=0 && eta>mineta && eta<maxeta){
      if(part->IsPrimary())nChargedMC++;
    } 
  }  
  return nChargedMC;
}
//______________________________________________________________________
Int_t AliVertexingHFUtils::GetGeneratedPhysicalPrimariesInEtaRange(TClonesArray* arrayMC, Double_t mineta, Double_t maxeta){
  // counts generated primary particles in given eta range

  Int_t nChargedMC=0;
  for(Int_t i=0;i<arrayMC->GetEntriesFast();i++){
    AliAODMCParticle *part=(AliAODMCParticle*)arrayMC->UncheckedAt(i);
    Int_t charge = part->Charge();
    Double_t eta = part->Eta();
    if(charge!=0 && eta>mineta && eta<maxeta){
      if(part->IsPhysicalPrimary())nChargedMC++;
    } 
  }
  return nChargedMC;
}
//______________________________________________________________________
void AliVertexingHFUtils::AveragePt(Float_t& averagePt, Float_t& errorPt,Float_t ptmin,Float_t ptmax, TH2F* hMassD, Float_t massFromFit, Float_t sigmaFromFit, TF1* funcB2, Float_t sigmaRangeForSig,Float_t sigmaRangeForBkg, Int_t rebin){

  // Compute <pt> from 2D histogram M vs pt

  //Make 2D histos in the desired pt range
  Int_t start=hMassD->FindBin(ptmin);
  Int_t end=hMassD->FindBin(ptmax)-1;
  const Int_t nx=end-start;
  TH2F *hMassDpt=new TH2F("hptmass","hptmass",nx,ptmin,ptmax,hMassD->GetNbinsY(),hMassD->GetYaxis()->GetBinLowEdge(1),hMassD->GetYaxis()->GetBinLowEdge(hMassD->GetNbinsY())+hMassD->GetYaxis()->GetBinWidth(hMassD->GetNbinsY()));
  for(Int_t ix=start;ix<end;ix++){
    for(Int_t iy=1;iy<=hMassD->GetNbinsY();iy++){
      hMassDpt->SetBinContent(ix-start+1,iy,hMassD->GetBinContent(ix,iy));
      hMassDpt->SetBinError(ix-start+1,iy,hMassD->GetBinError(ix,iy));
    }
  }

  Double_t minMassSig=massFromFit-sigmaRangeForSig*sigmaFromFit;
  Double_t maxMassSig=massFromFit+sigmaRangeForSig*sigmaFromFit;
  Int_t minBinSig=hMassD->GetYaxis()->FindBin(minMassSig);
  Int_t maxBinSig=hMassD->GetYaxis()->FindBin(maxMassSig);
  Double_t minMassSigBin=hMassD->GetYaxis()->GetBinLowEdge(minBinSig);
  Double_t maxMassSigBin=hMassD->GetYaxis()->GetBinLowEdge(maxBinSig)+hMassD->GetYaxis()->GetBinWidth(maxBinSig);
  //  printf("Signal Fit Limits = %f %f\n",minMassSigBin,maxMassSigBin);

  Double_t maxMassBkgLow=massFromFit-sigmaRangeForBkg*sigmaFromFit;
  Int_t minBinBkgLow=2;
  Int_t maxBinBkgLow=hMassD->GetYaxis()->FindBin(maxMassBkgLow);
  Double_t minMassBkgLowBin=hMassD->GetYaxis()->GetBinLowEdge(minBinBkgLow);
  Double_t maxMassBkgLowBin=hMassD->GetYaxis()->GetBinLowEdge(maxBinBkgLow)+hMassD->GetYaxis()->GetBinWidth(maxBinBkgLow);
  Double_t minMassBkgHi=massFromFit+sigmaRangeForBkg*sigmaFromFit;
  Int_t minBinBkgHi=hMassD->GetYaxis()->FindBin(minMassBkgHi);
  Int_t maxBinBkgHi=hMassD->GetNbinsY()-1;
  Double_t minMassBkgHiBin=hMassD->GetYaxis()->GetBinLowEdge(minBinBkgHi);
  Double_t maxMassBkgHiBin=hMassD->GetYaxis()->GetBinLowEdge(maxBinBkgHi)+hMassD->GetYaxis()->GetBinWidth(maxBinBkgHi);
  //  printf("BKG Fit Limits = %f %f  && %f %f\n",minMassBkgLowBin,maxMassBkgLowBin,minMassBkgHiBin,maxMassBkgHiBin);

  Double_t bkgSig=funcB2->Integral(minMassSigBin,maxMassSigBin);
  Double_t bkgLow=funcB2->Integral(minMassBkgLowBin,maxMassBkgLowBin);
  Double_t bkgHi=funcB2->Integral(minMassBkgHiBin,maxMassBkgHiBin);
  //  printf("Background integrals = %f %f %f\n",bkgLow,bkgSig,bkgHi);

  TH1F* hMptBkgLo=(TH1F*)hMassDpt->ProjectionX("hPtBkgLoBin",minBinBkgLow,maxBinBkgLow);
  TH1F* hMptBkgHi=(TH1F*)hMassDpt->ProjectionX("hPtBkgHiBin",minBinBkgHi,maxBinBkgHi);
  TH1F* hMptSigReg=(TH1F*)hMassDpt->ProjectionX("hCPtBkgSigBin",minBinSig,maxBinSig);

  hMptBkgLo->Rebin(rebin);
  hMptBkgHi->Rebin(rebin);
  hMptSigReg->Rebin(rebin);

  hMptBkgLo->Sumw2();
  hMptBkgHi->Sumw2();
  TH1F* hMptBkgLoScal=(TH1F*)hMptBkgLo->Clone("hPtBkgLoScalBin");
  hMptBkgLoScal->Scale(bkgSig/bkgLow);
  TH1F* hMptBkgHiScal=(TH1F*)hMptBkgHi->Clone("hPtBkgHiScalBin");
  hMptBkgHiScal->Scale(bkgSig/bkgHi);

  TH1F* hMptBkgAver=0x0;
  hMptBkgAver=(TH1F*)hMptBkgLoScal->Clone("hPtBkgAverBin");
  hMptBkgAver->Add(hMptBkgHiScal);
  hMptBkgAver->Scale(0.5);
  TH1F* hMptSig=(TH1F*)hMptSigReg->Clone("hCPtSigBin");
  hMptSig->Add(hMptBkgAver,-1.);   
 
  averagePt = hMptSig->GetMean();
  errorPt = hMptSig->GetMeanError();

  delete hMptBkgLo;
  delete hMptBkgHi;
  delete hMptSigReg;
  delete hMptBkgLoScal;
  delete hMptBkgHiScal;
  delete hMptBkgAver;
  delete hMassDpt;
  delete hMptSig;

}
//____________________________________________________________________________
Double_t AliVertexingHFUtils::GetTrueImpactParameterDzero(AliAODMCHeader *mcHeader, TClonesArray* arrayMC, AliAODMCParticle *partD) {
  // true impact parameter calculation for Dzero

  if(!partD || !arrayMC || !mcHeader) return 99999.;
  Int_t code=partD->GetPdgCode();
  if(TMath::Abs(code)!=421) return 99999.;

  Double_t vtxTrue[3];
  mcHeader->GetVertex(vtxTrue);
  Double_t origD[3];
  partD->XvYvZv(origD);
  Short_t charge=partD->Charge();
  Double_t pXdauTrue[2],pYdauTrue[2],pZdauTrue[2];
  for(Int_t iDau=0; iDau<2; iDau++){
    pXdauTrue[iDau]=0.;
    pYdauTrue[iDau]=0.;
    pZdauTrue[iDau]=0.;
  }

  Int_t nDau=partD->GetNDaughters();
  Int_t labelFirstDau = partD->GetDaughter(0); 
  if(nDau==2){
    for(Int_t iDau=0; iDau<2; iDau++){
      Int_t ind = labelFirstDau+iDau;
      AliAODMCParticle* part = dynamic_cast<AliAODMCParticle*>(arrayMC->At(ind));
      if(!part){
	printf("Daughter particle not found in MC array");
	return 99999.;
      } 
      pXdauTrue[iDau]=part->Px();
      pYdauTrue[iDau]=part->Py();
      pZdauTrue[iDau]=part->Pz();
    }
  }else{
    return 99999.;
  }

  Double_t d0dummy[2]={0.,0.};
  AliAODRecoDecayHF aodDvsMC(vtxTrue,origD,2,charge,pXdauTrue,pYdauTrue,pZdauTrue,d0dummy);
  return aodDvsMC.ImpParXY();

}
//____________________________________________________________________________
Double_t AliVertexingHFUtils::GetTrueImpactParameterDplus(AliAODMCHeader *mcHeader, TClonesArray* arrayMC, AliAODMCParticle *partD) {
  // true impact parameter calculation for Dplus

  if(!partD || !arrayMC || !mcHeader) return 99999.;
  Int_t code=partD->GetPdgCode();
  if(TMath::Abs(code)!=411) return 99999.;

  Double_t vtxTrue[3];
  mcHeader->GetVertex(vtxTrue);
  Double_t origD[3];
  partD->XvYvZv(origD);
  Short_t charge=partD->Charge();
  Double_t pXdauTrue[3],pYdauTrue[3],pZdauTrue[3];
  for(Int_t iDau=0; iDau<3; iDau++){
    pXdauTrue[iDau]=0.;
    pYdauTrue[iDau]=0.;
    pZdauTrue[iDau]=0.;
  }

  Int_t nDau=partD->GetNDaughters();
  Int_t labelFirstDau = partD->GetDaughter(0); 
  if(nDau==3){
    for(Int_t iDau=0; iDau<3; iDau++){
      Int_t ind = labelFirstDau+iDau;
      AliAODMCParticle* part = dynamic_cast<AliAODMCParticle*>(arrayMC->At(ind));
      if(!part){
	printf("Daughter particle not found in MC array");
	return 99999.;
      } 
      pXdauTrue[iDau]=part->Px();
      pYdauTrue[iDau]=part->Py();
      pZdauTrue[iDau]=part->Pz();
    }
  }else if(nDau==2){
    Int_t theDau=0;
    for(Int_t iDau=0; iDau<2; iDau++){
      Int_t ind = labelFirstDau+iDau;
      AliAODMCParticle* part = dynamic_cast<AliAODMCParticle*>(arrayMC->At(ind));
      if(!part){
	printf("Daughter particle not found in MC array");
	return 99999.;
      } 
      Int_t pdgCode=TMath::Abs(part->GetPdgCode());
      if(pdgCode==211 || pdgCode==321){
	pXdauTrue[theDau]=part->Px();
	pYdauTrue[theDau]=part->Py();
	pZdauTrue[theDau]=part->Pz();
	++theDau;
      }else{
	Int_t nDauRes=part->GetNDaughters();
	if(nDauRes==2){
	  Int_t labelFirstDauRes = part->GetDaughter(0); 	
	  for(Int_t iDauRes=0; iDauRes<2; iDauRes++){
	    Int_t indDR = labelFirstDauRes+iDauRes;
	    AliAODMCParticle* partDR = dynamic_cast<AliAODMCParticle*>(arrayMC->At(indDR));
	    if(!partDR){
	      printf("Daughter particle not found in MC array");
	      return 99999.;
	    } 
	    
	    Int_t pdgCodeDR=TMath::Abs(partDR->GetPdgCode());
 	    if(pdgCodeDR==211 || pdgCodeDR==321){
	      pXdauTrue[theDau]=partDR->Px();
	      pYdauTrue[theDau]=partDR->Py();
	      pZdauTrue[theDau]=partDR->Pz();
	      ++theDau;
	    }
	  }
	}
      }
    }
    if(theDau!=3){
      printf("Wrong number of decay prongs");
      return 99999.;
    }
  }

  Double_t d0dummy[3]={0.,0.,0.};
  AliAODRecoDecayHF aodDvsMC(vtxTrue,origD,3,charge,pXdauTrue,pYdauTrue,pZdauTrue,d0dummy);
  return aodDvsMC.ImpParXY();

}


//____________________________________________________________________________
Double_t AliVertexingHFUtils::GetCorrectedNtracklets(TProfile* estimatorAvg, Double_t uncorrectedNacc, Double_t vtxZ, Double_t refMult) {
  //
  // Correct the number of accepted tracklets based on a TProfile Hist
  //
  //

  if(TMath::Abs(vtxZ)>10.0){
    printf("ERROR: Z vertex out of range for correction of multiplicity\n");
    return uncorrectedNacc;
  }

  if(!estimatorAvg){
    printf("ERROR: Missing TProfile for correction of multiplicity\n");
    return uncorrectedNacc;
  }

  Double_t localAvg = estimatorAvg->GetBinContent(estimatorAvg->FindBin(vtxZ));

  Double_t deltaM = uncorrectedNacc*(refMult/localAvg - 1);

  Double_t correctedNacc = uncorrectedNacc + (deltaM>0 ? 1 : -1) * gRandom->Poisson(TMath::Abs(deltaM));

  return correctedNacc;
}
Commit	Line	Data
a6c5a2e9	1	/**************************************************************************
	2	* Copyright(c) 2007-2009, 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	#include <TMath.h>
686e4710	17	#include <TRandom.h>
b176db3b	18	#include <TProfile.h>
	19	#include <TClonesArray.h>
	20	#include <TH1F.h>
	21	#include <TH2F.h>
	22	#include <TF1.h>
a6c5a2e9	23	#include "AliAODEvent.h"
b176db3b	24	#include "AliAODMCHeader.h"
25504150	25	#include "AliAODMCParticle.h"
b176db3b	26	#include "AliAODRecoDecayHF.h"
a6c5a2e9	27	#include "AliVertexingHFUtils.h"
a6c5a2e9	28
d947ea9c	29	/* $Id$ */
a6c5a2e9	30
	31	///////////////////////////////////////////////////////////////////
	32	// //
	33	// Class with functions useful for different D2H analyses //
	34	// - event plane resolution //
	35	// - <pt> calculation with side band subtraction //
25504150	36	// - tracklet multiplicity calculation //
a6c5a2e9	37	// Origin: F.Prino, Torino, prino@to.infn.it //
	38	// //
	39	///////////////////////////////////////////////////////////////////
	40
	41	ClassImp(AliVertexingHFUtils)
	42
	43	//______________________________________________________________________
	44	AliVertexingHFUtils::AliVertexingHFUtils():TObject(),
	45	fK(1),
	46	fSubRes(1.),
	47	fMinEtaForTracklets(-1.),
	48	fMaxEtaForTracklets(1.)
	49	{
	50	// Default contructor
	51	}
	52
	53
	54	//______________________________________________________________________
	55	AliVertexingHFUtils::AliVertexingHFUtils(Int_t k):
	56	TObject(),
	57	fK(k),
	58	fSubRes(1.),
	59	fMinEtaForTracklets(-1.),
	60	fMaxEtaForTracklets(1.)
	61	{
	62	// Standard constructor
	63	}
	64
	65
5d1396f9	66	//______________________________________________________________________
	67	void AliVertexingHFUtils::ComputeSignificance(Double_t signal, Double_t errsignal, Double_t background, Double_t errbackground, Double_t &significance,Double_t &errsignificance){
	68	// calculate significance from S, B and errors
	69
	70
	71	Double_t errSigSq=errsignal*errsignal;
	72	Double_t errBkgSq=errbackground*errbackground;
	73	Double_t sigPlusBkg=signal+background;
	74	if(sigPlusBkg>0. && signal>0.){
	75	significance = signal/TMath::Sqrt(signal+background);
	76	errsignificance = significanceTMath::Sqrt((errSigSq+errBkgSq)/(4.sigPlusBkgsigPlusBkg)+(background/sigPlusBkg)errSigSq/signal/signal);
	77	}else{
	78	significance=0.;
	79	errsignificance=0.;
	80	}
	81	return;
	82
	83	}
a6c5a2e9	84	//______________________________________________________________________
	85	Double_t AliVertexingHFUtils::Pol(Double_t x, Int_t k){
	86	// compute chi from polynomial approximation
	87	Double_t c[5];
	88	if(k==1){
	89	c[0]=0.626657; c[1]=0.; c[2]=-0.09694; c[3]=0.02754; c[4]=-0.002283;
	90	}
	91	else if(k==2){
	92	c[0]=0.; c[1]=0.25; c[2]=-0.011414; c[3]=-0.034726; c[4]=0.006815;
	93	}
	94	else return -1;
	95	return c[0]x+c[1]xx+c[2]xxx+c[3]xxxx+c[4]xxxx*x;
	96	}
	97
	98	//______________________________________________________________________
	99	Double_t AliVertexingHFUtils:: ResolK1(Double_t x){
	100	return TMath::Sqrt(TMath::Pi()/8)xTMath::Exp(-xx/4)(TMath::BesselI0(xx/4)+TMath::BesselI1(xx/4));
	101	}
	102
	103
	104	//______________________________________________________________________
	105	Double_t AliVertexingHFUtils::FindChi(Double_t res, Int_t k){
	106	// compute chi variable (=v2*sqrt(N)) from external values
	107
	108	Double_t x1=0;
	109	Double_t x2=15;
	110	Double_t y1,y2;
	111	if(k==1){
	112	y1=ResolK1(x1)-res;
	113	y2=ResolK1(x2)-res;
	114	}
	115	else if(k==2){
	116	y1=Pol(x1,2)-res;
	117	y2=Pol(x2,2)-res;
	118	}
	119	else return -1;
	120
	121	if(y1*y2>0) return -1;
	122	if(y1==0) return y1;
	123	if(y2==0) return y2;
	124	Double_t xmed,ymed;
	125	Int_t jiter=0;
	126	while((x2-x1)>0.0001){
	127	xmed=0.5*(x1+x2);
	128	if(k==1){
	129	y1=ResolK1(x1)-res;
	130	y2=ResolK1(x2)-res;
	131	ymed=ResolK1(xmed)-res;
	132	}
	133	else if(k==2){
	134	y1=Pol(x1,2)-res;
	135	y2=Pol(x2,2)-res;
	136	ymed=Pol(xmed,2)-res;
	137	}
	138	else return -1;
	139	if((y1*ymed)<0) x2=xmed;
	140	if((y2*ymed)<0)x1=xmed;
	141	if(ymed==0) return xmed;
	142	jiter++;
	143	}
	144	return 0.5*(x1+x2);
	145	}
	146
	147	//______________________________________________________________________
148	Double_t AliVertexingHFUtils::GetFullEvResol(Double_t resSub, Int_t k){
149	// computes event plane resolution starting from sub event resolution
150	Double_t chisub=FindChi(resSub,k);
151	Double_t chifull=chisub*TMath::Sqrt(2);
152	if(k==1) return ResolK1(chifull);
153	else if(k==2) return Pol(chifull,2);
154	else{
155	printf("k should be <=2\n");
156	return 1.;
157	}
158	}
159
160	//______________________________________________________________________
161	Double_t AliVertexingHFUtils::GetFullEvResol(const TH1F* hSubEvCorr, Int_t k){
162	// computes event plane resolution starting from sub event correlation histogram
163	if(!hSubEvCorr) return 1.;
164	Double_t resSub=GetSubEvResol(hSubEvCorr);
165	return GetFullEvResol(resSub,k);
166	}
167	//______________________________________________________________________
168	Double_t AliVertexingHFUtils::GetFullEvResolLowLim(const TH1F* hSubEvCorr, Int_t k){
169	// computes low limit event plane resolution starting from sub event correlation histogram
170	if(!hSubEvCorr) return 1.;
171	Double_t resSub=GetSubEvResolLowLim(hSubEvCorr);
172	printf("%f\n",resSub);
173	return GetFullEvResol(resSub,k);
174	}
175	//______________________________________________________________________
176	Double_t AliVertexingHFUtils::GetFullEvResolHighLim(const TH1F* hSubEvCorr, Int_t k){
177	// computes high limit event plane resolution starting from sub event correlation histogram
178	if(!hSubEvCorr) return 1.;
179	Double_t resSub=GetSubEvResolHighLim(hSubEvCorr);
180	printf("%f\n",resSub);
181	return GetFullEvResol(resSub,k);
182	}
183	//______________________________________________________________________
184	Int_t AliVertexingHFUtils::GetNumberOfTrackletsInEtaRange(AliAODEvent* ev, Double_t mineta, Double_t maxeta){
185	// counts tracklets in given eta range
186	AliAODTracklets* tracklets=ev->GetTracklets();
187	Int_t nTr=tracklets->GetNumberOfTracklets();
188	Int_t count=0;
189	for(Int_t iTr=0; iTr<nTr; iTr++){
190	Double_t theta=tracklets->GetTheta(iTr);
191	Double_t eta=-TMath::Log(TMath::Tan(theta/2.));
192	if(eta>mineta && eta<maxeta) count++;
193	}
194	return count;
195	}
86d84fa4	196	//______________________________________________________________________
25504150	197	Int_t AliVertexingHFUtils::GetGeneratedMultiplicityInEtaRange(TClonesArray* arrayMC, Double_t mineta, Double_t maxeta){
	198	// counts generated particles in fgiven eta range
	199
	200	Int_t nChargedMC=0;
	201	for(Int_t i=0;i<arrayMC->GetEntriesFast();i++){
	202	AliAODMCParticle part=(AliAODMCParticle)arrayMC->UncheckedAt(i);
	203	Int_t charge = part->Charge();
	204	Double_t eta = part->Eta();
	205	if(charge!=0 && eta>mineta && eta<maxeta) nChargedMC++;
	206	}
	207	return nChargedMC;
	208	}
	209	//______________________________________________________________________
	210	Int_t AliVertexingHFUtils::GetGeneratedPrimariesInEtaRange(TClonesArray* arrayMC, Double_t mineta, Double_t maxeta){
	211	// counts generated primary particles in given eta range
	212
	213	Int_t nChargedMC=0;
	214	for(Int_t i=0;i<arrayMC->GetEntriesFast();i++){
	215	AliAODMCParticle part=(AliAODMCParticle)arrayMC->UncheckedAt(i);
	216	Int_t charge = part->Charge();
	217	Double_t eta = part->Eta();
	218	if(charge!=0 && eta>mineta && eta<maxeta){
	219	if(part->IsPrimary())nChargedMC++;
	220	}
	221	}
	222	return nChargedMC;
	223	}
	224	//______________________________________________________________________
	225	Int_t AliVertexingHFUtils::GetGeneratedPhysicalPrimariesInEtaRange(TClonesArray* arrayMC, Double_t mineta, Double_t maxeta){
	226	// counts generated primary particles in given eta range
	227
	228	Int_t nChargedMC=0;
	229	for(Int_t i=0;i<arrayMC->GetEntriesFast();i++){
	230	AliAODMCParticle part=(AliAODMCParticle)arrayMC->UncheckedAt(i);
	231	Int_t charge = part->Charge();
	232	Double_t eta = part->Eta();
	233	if(charge!=0 && eta>mineta && eta<maxeta){
	234	if(part->IsPhysicalPrimary())nChargedMC++;
	235	}
	236	}
	237	return nChargedMC;
	238	}
	239	//______________________________________________________________________
86d84fa4	240	void AliVertexingHFUtils::AveragePt(Float_t& averagePt, Float_t& errorPt,Float_t ptmin,Float_t ptmax, TH2F* hMassD, Float_t massFromFit, Float_t sigmaFromFit, TF1* funcB2, Float_t sigmaRangeForSig,Float_t sigmaRangeForBkg, Int_t rebin){
	241
	242	// Compute <pt> from 2D histogram M vs pt
	243
	244	//Make 2D histos in the desired pt range
	245	Int_t start=hMassD->FindBin(ptmin);
	246	Int_t end=hMassD->FindBin(ptmax)-1;
	247	const Int_t nx=end-start;
	248	TH2F *hMassDpt=new TH2F("hptmass","hptmass",nx,ptmin,ptmax,hMassD->GetNbinsY(),hMassD->GetYaxis()->GetBinLowEdge(1),hMassD->GetYaxis()->GetBinLowEdge(hMassD->GetNbinsY())+hMassD->GetYaxis()->GetBinWidth(hMassD->GetNbinsY()));
	249	for(Int_t ix=start;ix<end;ix++){
	250	for(Int_t iy=1;iy<=hMassD->GetNbinsY();iy++){
	251	hMassDpt->SetBinContent(ix-start+1,iy,hMassD->GetBinContent(ix,iy));
	252	hMassDpt->SetBinError(ix-start+1,iy,hMassD->GetBinError(ix,iy));
	253	}
	254	}
	255
	256	Double_t minMassSig=massFromFit-sigmaRangeForSig*sigmaFromFit;
	257	Double_t maxMassSig=massFromFit+sigmaRangeForSig*sigmaFromFit;
	258	Int_t minBinSig=hMassD->GetYaxis()->FindBin(minMassSig);
	259	Int_t maxBinSig=hMassD->GetYaxis()->FindBin(maxMassSig);
	260	Double_t minMassSigBin=hMassD->GetYaxis()->GetBinLowEdge(minBinSig);
	261	Double_t maxMassSigBin=hMassD->GetYaxis()->GetBinLowEdge(maxBinSig)+hMassD->GetYaxis()->GetBinWidth(maxBinSig);
	262	// printf("Signal Fit Limits = %f %f\n",minMassSigBin,maxMassSigBin);
	263
	264	Double_t maxMassBkgLow=massFromFit-sigmaRangeForBkg*sigmaFromFit;
	265	Int_t minBinBkgLow=2;
	266	Int_t maxBinBkgLow=hMassD->GetYaxis()->FindBin(maxMassBkgLow);
	267	Double_t minMassBkgLowBin=hMassD->GetYaxis()->GetBinLowEdge(minBinBkgLow);
	268	Double_t maxMassBkgLowBin=hMassD->GetYaxis()->GetBinLowEdge(maxBinBkgLow)+hMassD->GetYaxis()->GetBinWidth(maxBinBkgLow);
	269	Double_t minMassBkgHi=massFromFit+sigmaRangeForBkg*sigmaFromFit;
	270	Int_t minBinBkgHi=hMassD->GetYaxis()->FindBin(minMassBkgHi);
	271	Int_t maxBinBkgHi=hMassD->GetNbinsY()-1;
	272	Double_t minMassBkgHiBin=hMassD->GetYaxis()->GetBinLowEdge(minBinBkgHi);
	273	Double_t maxMassBkgHiBin=hMassD->GetYaxis()->GetBinLowEdge(maxBinBkgHi)+hMassD->GetYaxis()->GetBinWidth(maxBinBkgHi);
	274	// printf("BKG Fit Limits = %f %f && %f %f\n",minMassBkgLowBin,maxMassBkgLowBin,minMassBkgHiBin,maxMassBkgHiBin);
	275
	276	Double_t bkgSig=funcB2->Integral(minMassSigBin,maxMassSigBin);
	277	Double_t bkgLow=funcB2->Integral(minMassBkgLowBin,maxMassBkgLowBin);
	278	Double_t bkgHi=funcB2->Integral(minMassBkgHiBin,maxMassBkgHiBin);
	279	// printf("Background integrals = %f %f %f\n",bkgLow,bkgSig,bkgHi);
	280
	281	TH1F* hMptBkgLo=(TH1F*)hMassDpt->ProjectionX("hPtBkgLoBin",minBinBkgLow,maxBinBkgLow);
	282	TH1F* hMptBkgHi=(TH1F*)hMassDpt->ProjectionX("hPtBkgHiBin",minBinBkgHi,maxBinBkgHi);
	283	TH1F* hMptSigReg=(TH1F*)hMassDpt->ProjectionX("hCPtBkgSigBin",minBinSig,maxBinSig);
	284
	285	hMptBkgLo->Rebin(rebin);
	286	hMptBkgHi->Rebin(rebin);
	287	hMptSigReg->Rebin(rebin);
	288
	289	hMptBkgLo->Sumw2();
	290	hMptBkgHi->Sumw2();
	291	TH1F* hMptBkgLoScal=(TH1F*)hMptBkgLo->Clone("hPtBkgLoScalBin");
	292	hMptBkgLoScal->Scale(bkgSig/bkgLow);
	293	TH1F* hMptBkgHiScal=(TH1F*)hMptBkgHi->Clone("hPtBkgHiScalBin");
	294	hMptBkgHiScal->Scale(bkgSig/bkgHi);
	295
	296	TH1F* hMptBkgAver=0x0;
	297	hMptBkgAver=(TH1F*)hMptBkgLoScal->Clone("hPtBkgAverBin");
	298	hMptBkgAver->Add(hMptBkgHiScal);
	299	hMptBkgAver->Scale(0.5);
	300	TH1F* hMptSig=(TH1F*)hMptSigReg->Clone("hCPtSigBin");
	301	hMptSig->Add(hMptBkgAver,-1.);
	302
	303	averagePt = hMptSig->GetMean();
304	errorPt = hMptSig->GetMeanError();
305
306	delete hMptBkgLo;
307	delete hMptBkgHi;
308	delete hMptSigReg;
309	delete hMptBkgLoScal;
310	delete hMptBkgHiScal;
311	delete hMptBkgAver;
312	delete hMassDpt;
313	delete hMptSig;
314
15917f37	315	}
	316	//____________________________________________________________________________
	317	Double_t AliVertexingHFUtils::GetTrueImpactParameterDzero(AliAODMCHeader mcHeader, TClonesArray arrayMC, AliAODMCParticle *partD) {
	318	// true impact parameter calculation for Dzero
	319
	320	if(!partD \|\| !arrayMC \|\| !mcHeader) return 99999.;
	321	Int_t code=partD->GetPdgCode();
	322	if(TMath::Abs(code)!=421) return 99999.;
	323
	324	Double_t vtxTrue[3];
	325	mcHeader->GetVertex(vtxTrue);
	326	Double_t origD[3];
	327	partD->XvYvZv(origD);
	328	Short_t charge=partD->Charge();
	329	Double_t pXdauTrue[2],pYdauTrue[2],pZdauTrue[2];
	330	for(Int_t iDau=0; iDau<2; iDau++){
	331	pXdauTrue[iDau]=0.;
	332	pYdauTrue[iDau]=0.;
	333	pZdauTrue[iDau]=0.;
	334	}
	335
	336	Int_t nDau=partD->GetNDaughters();
	337	Int_t labelFirstDau = partD->GetDaughter(0);
	338	if(nDau==2){
	339	for(Int_t iDau=0; iDau<2; iDau++){
	340	Int_t ind = labelFirstDau+iDau;
	341	AliAODMCParticle* part = dynamic_cast<AliAODMCParticle*>(arrayMC->At(ind));
	342	if(!part){
	343	printf("Daughter particle not found in MC array");
	344	return 99999.;
	345	}
	346	pXdauTrue[iDau]=part->Px();
	347	pYdauTrue[iDau]=part->Py();
	348	pZdauTrue[iDau]=part->Pz();
	349	}
	350	}else{
	351	return 99999.;
	352	}
	353
48efc6ad	354	Double_t d0dummy[2]={0.,0.};
15917f37	355	AliAODRecoDecayHF aodDvsMC(vtxTrue,origD,2,charge,pXdauTrue,pYdauTrue,pZdauTrue,d0dummy);
	356	return aodDvsMC.ImpParXY();
	357
86d84fa4	358	}
b176db3b	359	//____________________________________________________________________________
	360	Double_t AliVertexingHFUtils::GetTrueImpactParameterDplus(AliAODMCHeader mcHeader, TClonesArray arrayMC, AliAODMCParticle *partD) {
	361	// true impact parameter calculation for Dplus
	362
	363	if(!partD \|\| !arrayMC \|\| !mcHeader) return 99999.;
	364	Int_t code=partD->GetPdgCode();
	365	if(TMath::Abs(code)!=411) return 99999.;
	366
	367	Double_t vtxTrue[3];
	368	mcHeader->GetVertex(vtxTrue);
	369	Double_t origD[3];
	370	partD->XvYvZv(origD);
	371	Short_t charge=partD->Charge();
	372	Double_t pXdauTrue[3],pYdauTrue[3],pZdauTrue[3];
	373	for(Int_t iDau=0; iDau<3; iDau++){
	374	pXdauTrue[iDau]=0.;
	375	pYdauTrue[iDau]=0.;
	376	pZdauTrue[iDau]=0.;
	377	}
	378
	379	Int_t nDau=partD->GetNDaughters();
	380	Int_t labelFirstDau = partD->GetDaughter(0);
	381	if(nDau==3){
	382	for(Int_t iDau=0; iDau<3; iDau++){
	383	Int_t ind = labelFirstDau+iDau;
	384	AliAODMCParticle* part = dynamic_cast<AliAODMCParticle*>(arrayMC->At(ind));
	385	if(!part){
	386	printf("Daughter particle not found in MC array");
	387	return 99999.;
	388	}
	389	pXdauTrue[iDau]=part->Px();
	390	pYdauTrue[iDau]=part->Py();
	391	pZdauTrue[iDau]=part->Pz();
	392	}
	393	}else if(nDau==2){
	394	Int_t theDau=0;
	395	for(Int_t iDau=0; iDau<2; iDau++){
	396	Int_t ind = labelFirstDau+iDau;
	397	AliAODMCParticle* part = dynamic_cast<AliAODMCParticle*>(arrayMC->At(ind));
	398	if(!part){
	399	printf("Daughter particle not found in MC array");
	400	return 99999.;
	401	}
	402	Int_t pdgCode=TMath::Abs(part->GetPdgCode());
	403	if(pdgCode==211 \|\| pdgCode==321){
	404	pXdauTrue[theDau]=part->Px();
	405	pYdauTrue[theDau]=part->Py();
	406	pZdauTrue[theDau]=part->Pz();
	407	++theDau;
	408	}else{
	409	Int_t nDauRes=part->GetNDaughters();
	410	if(nDauRes==2){
	411	Int_t labelFirstDauRes = part->GetDaughter(0);
	412	for(Int_t iDauRes=0; iDauRes<2; iDauRes++){
	413	Int_t indDR = labelFirstDauRes+iDauRes;
	414	AliAODMCParticle* partDR = dynamic_cast<AliAODMCParticle*>(arrayMC->At(indDR));
	415	if(!partDR){
	416	printf("Daughter particle not found in MC array");
	417	return 99999.;
	418	}
	419
	420	Int_t pdgCodeDR=TMath::Abs(partDR->GetPdgCode());
	421	if(pdgCodeDR==211 \|\| pdgCodeDR==321){
	422	pXdauTrue[theDau]=partDR->Px();
423	pYdauTrue[theDau]=partDR->Py();
424	pZdauTrue[theDau]=partDR->Pz();
425	++theDau;
426	}
427	}
428	}
429	}
430	}
431	if(theDau!=3){
432	printf("Wrong number of decay prongs");
433	return 99999.;
434	}
435	}
436
437	Double_t d0dummy[3]={0.,0.,0.};
438	AliAODRecoDecayHF aodDvsMC(vtxTrue,origD,3,charge,pXdauTrue,pYdauTrue,pZdauTrue,d0dummy);
439	return aodDvsMC.ImpParXY();
440
441	}
442
443
444
686e4710	445	//____________________________________________________________________________
	446	Double_t AliVertexingHFUtils::GetCorrectedNtracklets(TProfile* estimatorAvg, Double_t uncorrectedNacc, Double_t vtxZ, Double_t refMult) {
	447	//
	448	// Correct the number of accepted tracklets based on a TProfile Hist
	449	//
	450	//
	451
	452	if(TMath::Abs(vtxZ)>10.0){
	453	printf("ERROR: Z vertex out of range for correction of multiplicity\n");
	454	return uncorrectedNacc;
	455	}
	456
	457	if(!estimatorAvg){
	458	printf("ERROR: Missing TProfile for correction of multiplicity\n");
	459	return uncorrectedNacc;
	460	}
	461
	462	Double_t localAvg = estimatorAvg->GetBinContent(estimatorAvg->FindBin(vtxZ));
	463
	464	Double_t deltaM = uncorrectedNacc*(refMult/localAvg - 1);
	465
	466	Double_t correctedNacc = uncorrectedNacc + (deltaM>0 ? 1 : -1) * gRandom->Poisson(TMath::Abs(deltaM));
	467
	468	return correctedNacc;
	469	}
	470