[u/mrichter/AliRoot.git] / HLT / ITS / AliHLTITSVertexerZ.cxx

// $Id$

/**************************************************************************
 * 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.                  *
 **************************************************************************/
#include "AliHLTITSVertexerZ.h"
#include <TTree.h>
#include<TString.h>
#include<TH1.h>
#include<TMath.h>
#include <AliRun.h>
#include <AliITS.h>
#include "AliITSLoader.h"
#include <AliITSgeom.h>
#include <AliITSRecPoint.h>
#include <AliITSclusterV2.h>

//-------------------------------------------------------------------------
//                Implementation of the HLT ITS vertexer class
//
//          Origin: Cvetan Cheshkov, CERN, Cvetan.Cheshkov@cern.ch
//-------------------------------------------------------------------------

ClassImp(AliHLTITSVertexerZ)

AliHLTITSVertexerZ::AliHLTITSVertexerZ():
  AliITSVertexerZ(),
  fZCombf(0),
  fStepFine(0)
{
  // Constructor in case that there is no runloader
  SetBinWidthFine();
}

AliHLTITSVertexerZ::AliHLTITSVertexerZ(Float_t x0, Float_t y0):
  AliITSVertexerZ(x0,y0),
  fZCombf(0),
  fStepFine(0)
{
  // Standard Constructor
  SetBinWidthFine();
}

AliHLTITSVertexerZ::~AliHLTITSVertexerZ()
{
  // Destructor
  if (fZCombf) delete fZCombf;
}

//______________________________________________________________________
AliESDVertex* AliHLTITSVertexerZ::FindVertexForCurrentEvent(AliITSgeom *geom,TTree *tR){
  // Defines the AliESDVertex for the current event

  fCurrentVertex = 0;

  Float_t lc[3]; for(Int_t ii=0; ii<3; ii++) lc[ii]=0.;
  Float_t gc[3]; for(Int_t ii=0; ii<3; ii++) gc[ii]=0.;
  //Float_t lc2[3]; for(Int_t ii=0; ii<3; ii++) lc2[ii]=0.;
  //Float_t gc2[3]; for(Int_t ii=0; ii<3; ii++) gc2[ii]=0.;

  TClonesArray dummy("AliITSclusterV2",10000), *clusters=&dummy;
  TBranch *branch;
  branch = tR->GetBranch("Clusters");
  branch->SetAddress(&clusters);

  Int_t nrpL1 = 0;
  Int_t nrpL2 = 0;
  for(Int_t module= fFirstL1; module<=fLastL1;module++){
    if(module%4==0 || module%4==3)continue;
    //   cout<<"Procesing module "<<module<<" ";
    tR->GetEvent(module);
    //    cout<<"Number of clusters "<<clusters->GetEntries()<<endl;
    nrpL1+= clusters->GetEntriesFast();
  }
  for(Int_t module= fFirstL2; module<=fLastL2;module++){
    tR->GetEvent(module);
    nrpL2+= clusters->GetEntriesFast();
  }
  if(nrpL1 == 0 || nrpL2 == 0){
    ResetHistograms();
    return fCurrentVertex;
  }

  Int_t nPhiBins = (Int_t)(TMath::Pi()/fDiffPhiMax);
  Float_t phiBinSize = 2*TMath::Pi()/(Float_t)nPhiBins;

  Int_t maxind1 = 2*nrpL1/nPhiBins;
  Float_t **zc1 = new Float_t *[nPhiBins];
  Float_t **phi1 = new Float_t *[nPhiBins];
  Float_t **r1 = new Float_t *[nPhiBins];
  Int_t *ind1 = new Int_t [nPhiBins];
  Int_t maxind2 = 2*nrpL2/nPhiBins;
  Float_t **zc2 = new Float_t *[nPhiBins];
  Float_t **phi2 = new Float_t *[nPhiBins];
  Float_t **r2 = new Float_t *[nPhiBins];
  Int_t *ind2 = new Int_t [nPhiBins];
  for(Int_t i=0;i<nPhiBins;i++) {
    zc1[i] = new Float_t [maxind1];
    phi1[i] = new Float_t [maxind1];
    r1[i] = new Float_t [maxind1];
    zc2[i] = new Float_t [maxind2];
    phi2[i] = new Float_t [maxind2];
    r2[i] = new Float_t [maxind2];
  }
  
  Float_t yshift = 0;
  Float_t zshift[4] = {-10.708000, -3.536000, 3.536000, 10.708000};

  yshift = 0.248499;
  memset(ind1,0,nPhiBins*sizeof(Int_t));
  for(Int_t module= fFirstL1; module<=fLastL1;module++){
    if(module%4==0 || module%4==3)continue;
    tR->GetEvent(module);
    Int_t nrecp1 = clusters->GetEntriesFast();
    for(Int_t j=0;j<nrecp1;j++){
      AliITSclusterV2 *recp = (AliITSclusterV2*)clusters->UncheckedAt(j);
      lc[0]=-recp->GetY()+yshift;
      lc[2]=-recp->GetZ()+zshift[module%4];
      geom->LtoG(module,lc,gc);
      gc[0]-=GetNominalPos()[0];
      gc[1]-=GetNominalPos()[1];
      Float_t xc1,yc1;
      xc1=gc[0];
      yc1=gc[1];
      Float_t phi = TMath::ATan2(gc[1],gc[0]);
      if(phi<0)phi=2*TMath::Pi()+phi;
      Int_t bin = (Int_t)(phi/phiBinSize);
      if(bin>=nPhiBins || bin<0) bin = 0;
      Int_t ind = ind1[bin];
      if(ind<maxind1) {
	phi1[bin][ind] = phi;
	zc1[bin][ind]=gc[2]/fStepFine;
	r1[bin][ind]=sqrt(xc1*xc1+yc1*yc1);
	ind1[bin]++;
      }
    }
    clusters->Delete();
  }
  yshift = 3.096207;
  memset(ind2,0,nPhiBins*sizeof(Int_t));
  for(Int_t module= fFirstL2; module<=fLastL2;module++){
    tR->GetEvent(module);
    Int_t nrecp2 = clusters->GetEntriesFast();
    for(Int_t j=0;j<nrecp2;j++){
      AliITSclusterV2 *recp = (AliITSclusterV2*)clusters->UncheckedAt(j);
      lc[0]=recp->GetY()+yshift;
      lc[2]=-recp->GetZ()+zshift[module%4];
      geom->LtoG(module,lc,gc);
      gc[0]-=GetNominalPos()[0];
      gc[1]-=GetNominalPos()[1];
      Float_t xc2,yc2;
      xc2=gc[0];
      yc2=gc[1];
      Float_t phi = TMath::ATan2(gc[1],gc[0]);
      if(phi<0)phi=2*TMath::Pi()+phi;
      Int_t bin = (Int_t)(phi/phiBinSize+0.5);
      if(bin>=nPhiBins || bin<0) bin = 0;
      Int_t ind = ind2[bin];
      if(ind<maxind2) {
	phi2[bin][ind] = phi;
	zc2[bin][ind]=gc[2]/fStepFine;
	r2[bin][ind]=sqrt(xc2*xc2+yc2*yc2);
	ind2[bin]++;
      }
    }
    clusters->Delete();
  }
  Int_t nbinfine = static_cast<Int_t>((fHighLim-fLowLim)/fStepFine);
  Float_t lowz = fLowLim/fStepFine;
  Int_t *harray = new Int_t[nbinfine];
  memset(harray,0,nbinfine*sizeof(Int_t));
  for(Int_t ibin=0;ibin<nPhiBins;ibin++) {
    Float_t *pphi1 = phi1[ibin];
    Float_t *pr1 = r1[ibin];
    Float_t *pzc1 = zc1[ibin];
    for(Int_t i=0;i<ind1[ibin];i++){
      for(Int_t jbin=ibin;jbin<=(ibin+1);jbin++) {
	Int_t jbin2 = jbin;
	if(jbin==nPhiBins) jbin2 = 0;
	Float_t *pphi2 = phi2[jbin2];
	Float_t *pr2 = r2[jbin2];
	Float_t *pzc2 = zc2[jbin2];
	for(Int_t j=0;j<ind2[jbin2];j++){
	  Float_t diff = TMath::Abs(pphi2[j]-pphi1[i]);
	  if(diff>TMath::Pi())diff=2.*TMath::Pi()-diff;
	  if(diff<fDiffPhiMax){
	    Float_t zr0=(pr2[j]*pzc1[i]-pr1[i]*pzc2[j])/(pr2[j]-pr1[i]);
	    Int_t bin = (Int_t)(zr0-lowz);
	    if(bin>=0 && bin<nbinfine){
	      harray[bin]++;
	    }
	  }
	}
      }
    }
  }
  for(Int_t i=0;i<nPhiBins;i++) {
    delete [] zc1[i];
    delete [] phi1[i];
    delete [] r1[i];
    delete [] zc2[i];
    delete [] phi2[i];
    delete [] r2[i];
  }
  delete [] zc1;
  delete [] phi1;
  delete [] r1;
  delete [] ind1;
  delete [] zc2;
  delete [] phi2;
  delete [] r2;
  delete [] ind2;

  Int_t nbinratio = (Int_t)(fStepCoarse/fStepFine+0.5);
  Int_t nbincoarse = nbinfine/nbinratio;

  if(fZCombc)delete fZCombc;
  fZCombc = new TH1F("fZCombc","Z",nbincoarse,fLowLim,fLowLim+nbincoarse*fStepCoarse);
  if(fZCombf)delete fZCombf;
  fZCombf = new TH1F("fZCombf","Z",nbinfine,fLowLim,fLowLim+nbinfine*fStepFine);
  Stat_t contents=0;
  Int_t counter=0;
  for(Int_t bin=0;bin<nbinfine;bin++) {
    fZCombf->SetBinContent(bin+1,(Stat_t)harray[bin]);
    fZCombf->SetBinError(bin+1,TMath::Sqrt((Stat_t)harray[bin]));
    contents+=(Stat_t)harray[bin];
    counter++;
    if(counter==nbinratio) {
      Int_t binc=bin/nbinratio; 
      fZCombc->SetBinContent(binc+1,contents);
      fZCombc->SetBinError(binc+1,TMath::Sqrt(contents));
      contents=0;
      counter=0;
    }
  }

  delete [] harray;

  if(fZCombc->GetEntries()==0){
    Warning("FindVertexForCurrentEvent","Insufficient number of rec. points\n");
    ResetHistograms();
    return fCurrentVertex;
  }
  //  else {
  //    cout<<"Number of entries in hist. "<<fZCombc->GetEntries()<<endl;
  //  }
  Int_t bi = fZCombc->GetMaximumBin();
  Float_t centre = fZCombc->GetBinCenter(bi);
  Int_t n1 = static_cast<Int_t>((centre-fZCombc->GetBinWidth(bi)-fZCombf->GetBinLowEdge(0))/fZCombf->GetBinWidth(0));
  Int_t n2 = static_cast<Int_t>((centre+fZCombc->GetBinWidth(bi)-fZCombf->GetBinLowEdge(0))/fZCombf->GetBinWidth(0));
  Int_t niter = 0;
  Bool_t goon = kTRUE;
  Int_t num;
  while(goon){
    fZFound = 0.;
    fZsig = 0.;
    num=0;
    for(Int_t n=n1;n<=n2;n++){
      fZFound+=fZCombf->GetBinCenter(n)*fZCombf->GetBinContent(n);
      num+=static_cast<Int_t>(fZCombf->GetBinContent(n));
      fZsig+=fZCombf->GetBinCenter(n)*fZCombf->GetBinCenter(n)*fZCombf->GetBinContent(n);
    }
    if(num<2){
      fZsig = 0.;
    }
    else {
      Float_t radi =  fZsig/(num-1)-fZFound*fZFound/num/(num-1);
      if(radi>0.)fZsig=TMath::Sqrt(radi);
      else fZsig=0.;
      fZFound/=num;
    }
    goon = TMath::Abs(TMath::Abs(fZFound-fZCombf->GetBinCenter(n1))-TMath::Abs(fZFound-fZCombf->GetBinCenter(n2)))>fTolerance;
    n1 = static_cast<Int_t>((fZFound-fZCombc->GetBinWidth(bi)-fZCombf->GetBinLowEdge(0))/fZCombf->GetBinWidth(0));
    n2 = static_cast<Int_t>((fZFound+fZCombc->GetBinWidth(bi)-fZCombf->GetBinLowEdge(0))/fZCombf->GetBinWidth(0));
    niter++;
    if(niter>=10){
      goon = kFALSE;
      Warning("FindVertexForCurrentEvent","The procedure dows not converge\n");
    }
  }
  //  cout<<"Numer of Iterations "<<niter<<endl<<endl;
  fCurrentVertex = new AliESDVertex(fZFound,fZsig,num);
  fCurrentVertex->SetTitle("vertexer: HLT");
  ResetHistograms();
  PrintStatus();
  return fCurrentVertex;
}
Commit	Line	Data
d6e2c707	1	// $Id$
d6e2c707	2
dd36288a	3	/**************************************************************************
	4	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	5	* *
	6	* Author: The ALICE Off-line Project. *
	7	* Contributors are mentioned in the code where appropriate. *
	8	* *
	9	* Permission to use, copy, modify and distribute this software and its *
	10	* documentation strictly for non-commercial purposes is hereby granted *
	11	* without fee, provided that the above copyright notice appears in all *
	12	* copies and that both the copyright notice and this permission notice *
	13	* appear in the supporting documentation. The authors make no claims *
	14	* about the suitability of this software for any purpose. It is *
	15	* provided "as is" without express or implied warranty. *
	16	**************************************************************************/
4aa41877	17	#include "AliHLTITSVertexerZ.h"
c93255fe	18	#include <TTree.h>
dd36288a	19	#include<TString.h>
	20	#include<TH1.h>
	21	#include<TMath.h>
	22	#include <AliRun.h>
	23	#include <AliITS.h>
	24	#include "AliITSLoader.h"
	25	#include <AliITSgeom.h>
	26	#include <AliITSRecPoint.h>
3136129d	27	#include <AliITSclusterV2.h>
dd36288a	28
	29	//-------------------------------------------------------------------------
	30	// Implementation of the HLT ITS vertexer class
	31	//
	32	// Origin: Cvetan Cheshkov, CERN, Cvetan.Cheshkov@cern.ch
	33	//-------------------------------------------------------------------------
	34
4aa41877	35	ClassImp(AliHLTITSVertexerZ)
dd36288a	36
8b40a6b8	37	AliHLTITSVertexerZ::AliHLTITSVertexerZ():
	38	AliITSVertexerZ(),
	39	fZCombf(0),
	40	fStepFine(0)
	41	{
3136129d	42	// Constructor in case that there is no runloader
3136129d	43	SetBinWidthFine();
3136129d	44	}
3136129d	45
308c2f7c	46	AliHLTITSVertexerZ::AliHLTITSVertexerZ(Float_t x0, Float_t y0):
308c2f7c	47	AliITSVertexerZ(x0,y0),
8b40a6b8	48	fZCombf(0),
8b40a6b8	49	fStepFine(0)
dd36288a	50	{
dd36288a	51	// Standard Constructor
8b40a6b8	52	SetBinWidthFine();
	53	}
	54
	55	AliHLTITSVertexerZ::~AliHLTITSVertexerZ()
	56	{
	57	// Destructor
	58	if (fZCombf) delete fZCombf;
dd36288a	59	}
dd36288a	60
3136129d	61	//______________________________________________________________________
4aa41877	62	AliESDVertex* AliHLTITSVertexerZ::FindVertexForCurrentEvent(AliITSgeom geom,TTree tR){
3136129d	63	// Defines the AliESDVertex for the current event
	64
	65	fCurrentVertex = 0;
	66
dd36288a	67	Float_t lc[3]; for(Int_t ii=0; ii<3; ii++) lc[ii]=0.;
dd36288a	68	Float_t gc[3]; for(Int_t ii=0; ii<3; ii++) gc[ii]=0.;
75e6d9eb	69	//Float_t lc2[3]; for(Int_t ii=0; ii<3; ii++) lc2[ii]=0.;
75e6d9eb	70	//Float_t gc2[3]; for(Int_t ii=0; ii<3; ii++) gc2[ii]=0.;
dd36288a	71
dd36288a	72	TClonesArray dummy("AliITSclusterV2",10000), *clusters=&dummy;
dd36288a	73	TBranch *branch;
3136129d	74	branch = tR->GetBranch("Clusters");
3136129d	75	branch->SetAddress(&clusters);
dd36288a	76
	77	Int_t nrpL1 = 0;
	78	Int_t nrpL2 = 0;
	79	for(Int_t module= fFirstL1; module<=fLastL1;module++){
	80	if(module%4==0 \|\| module%4==3)continue;
	81	// cout<<"Procesing module "<<module<<" ";
3136129d	82	tR->GetEvent(module);
dd36288a	83	// cout<<"Number of clusters "<<clusters->GetEntries()<<endl;
3136129d	84	nrpL1+= clusters->GetEntriesFast();
dd36288a	85	}
dd36288a	86	for(Int_t module= fFirstL2; module<=fLastL2;module++){
3136129d	87	tR->GetEvent(module);
3136129d	88	nrpL2+= clusters->GetEntriesFast();
dd36288a	89	}
	90	if(nrpL1 == 0 \|\| nrpL2 == 0){
	91	ResetHistograms();
	92	return fCurrentVertex;
	93	}
	94
	95	Int_t nPhiBins = (Int_t)(TMath::Pi()/fDiffPhiMax);
	96	Float_t phiBinSize = 2*TMath::Pi()/(Float_t)nPhiBins;
	97
	98	Int_t maxind1 = 2*nrpL1/nPhiBins;
	99	Float_t *zc1 = new Float_t [nPhiBins];
	100	Float_t *phi1 = new Float_t [nPhiBins];
	101	Float_t *r1 = new Float_t [nPhiBins];
	102	Int_t *ind1 = new Int_t [nPhiBins];
	103	Int_t maxind2 = 2*nrpL2/nPhiBins;
	104	Float_t *zc2 = new Float_t [nPhiBins];
	105	Float_t *phi2 = new Float_t [nPhiBins];
	106	Float_t *r2 = new Float_t [nPhiBins];
	107	Int_t *ind2 = new Int_t [nPhiBins];
	108	for(Int_t i=0;i<nPhiBins;i++) {
	109	zc1[i] = new Float_t [maxind1];
	110	phi1[i] = new Float_t [maxind1];
	111	r1[i] = new Float_t [maxind1];
	112	zc2[i] = new Float_t [maxind2];
	113	phi2[i] = new Float_t [maxind2];
	114	r2[i] = new Float_t [maxind2];
	115	}
3136129d	116
	117	Float_t yshift = 0;
	118	Float_t zshift[4] = {-10.708000, -3.536000, 3.536000, 10.708000};
dd36288a	119
3136129d	120	yshift = 0.248499;
dd36288a	121	memset(ind1,0,nPhiBins*sizeof(Int_t));
	122	for(Int_t module= fFirstL1; module<=fLastL1;module++){
	123	if(module%4==0 \|\| module%4==3)continue;
3136129d	124	tR->GetEvent(module);
3136129d	125	Int_t nrecp1 = clusters->GetEntriesFast();
dd36288a	126	for(Int_t j=0;j<nrecp1;j++){
3136129d	127	AliITSclusterV2 recp = (AliITSclusterV2)clusters->UncheckedAt(j);
	128	lc[0]=-recp->GetY()+yshift;
	129	lc[2]=-recp->GetZ()+zshift[module%4];
dd36288a	130	geom->LtoG(module,lc,gc);
308c2f7c	131	gc[0]-=GetNominalPos()[0];
308c2f7c	132	gc[1]-=GetNominalPos()[1];
dd36288a	133	Float_t xc1,yc1;
	134	xc1=gc[0];
	135	yc1=gc[1];
	136	Float_t phi = TMath::ATan2(gc[1],gc[0]);
	137	if(phi<0)phi=2*TMath::Pi()+phi;
	138	Int_t bin = (Int_t)(phi/phiBinSize);
3136129d	139	if(bin>=nPhiBins \|\| bin<0) bin = 0;
dd36288a	140	Int_t ind = ind1[bin];
	141	if(ind<maxind1) {
	142	phi1[bin][ind] = phi;
	143	zc1[bin][ind]=gc[2]/fStepFine;
	144	r1[bin][ind]=sqrt(xc1xc1+yc1yc1);
	145	ind1[bin]++;
	146	}
	147	}
3136129d	148	clusters->Delete();
dd36288a	149	}
3136129d	150	yshift = 3.096207;
dd36288a	151	memset(ind2,0,nPhiBins*sizeof(Int_t));
dd36288a	152	for(Int_t module= fFirstL2; module<=fLastL2;module++){
3136129d	153	tR->GetEvent(module);
3136129d	154	Int_t nrecp2 = clusters->GetEntriesFast();
dd36288a	155	for(Int_t j=0;j<nrecp2;j++){
3136129d	156	AliITSclusterV2 recp = (AliITSclusterV2)clusters->UncheckedAt(j);
	157	lc[0]=recp->GetY()+yshift;
	158	lc[2]=-recp->GetZ()+zshift[module%4];
dd36288a	159	geom->LtoG(module,lc,gc);
308c2f7c	160	gc[0]-=GetNominalPos()[0];
308c2f7c	161	gc[1]-=GetNominalPos()[1];
dd36288a	162	Float_t xc2,yc2;
	163	xc2=gc[0];
	164	yc2=gc[1];
	165	Float_t phi = TMath::ATan2(gc[1],gc[0]);
	166	if(phi<0)phi=2*TMath::Pi()+phi;
	167	Int_t bin = (Int_t)(phi/phiBinSize+0.5);
3136129d	168	if(bin>=nPhiBins \|\| bin<0) bin = 0;
dd36288a	169	Int_t ind = ind2[bin];
	170	if(ind<maxind2) {
	171	phi2[bin][ind] = phi;
	172	zc2[bin][ind]=gc[2]/fStepFine;
	173	r2[bin][ind]=sqrt(xc2xc2+yc2yc2);
	174	ind2[bin]++;
	175	}
	176	}
3136129d	177	clusters->Delete();
dd36288a	178	}
	179	Int_t nbinfine = static_cast<Int_t>((fHighLim-fLowLim)/fStepFine);
	180	Float_t lowz = fLowLim/fStepFine;
dd36288a	181	Int_t *harray = new Int_t[nbinfine];
	182	memset(harray,0,nbinfine*sizeof(Int_t));
	183	for(Int_t ibin=0;ibin<nPhiBins;ibin++) {
	184	Float_t *pphi1 = phi1[ibin];
	185	Float_t *pr1 = r1[ibin];
	186	Float_t *pzc1 = zc1[ibin];
	187	for(Int_t i=0;i<ind1[ibin];i++){
	188	for(Int_t jbin=ibin;jbin<=(ibin+1);jbin++) {
	189	Int_t jbin2 = jbin;
	190	if(jbin==nPhiBins) jbin2 = 0;
	191	Float_t *pphi2 = phi2[jbin2];
	192	Float_t *pr2 = r2[jbin2];
	193	Float_t *pzc2 = zc2[jbin2];
	194	for(Int_t j=0;j<ind2[jbin2];j++){
	195	Float_t diff = TMath::Abs(pphi2[j]-pphi1[i]);
	196	if(diff>TMath::Pi())diff=2.*TMath::Pi()-diff;
	197	if(diff<fDiffPhiMax){
	198	Float_t zr0=(pr2[j]pzc1[i]-pr1[i]pzc2[j])/(pr2[j]-pr1[i]);
3136129d	199	Int_t bin = (Int_t)(zr0-lowz);
3136129d	200	if(bin>=0 && bin<nbinfine){
dd36288a	201	harray[bin]++;
	202	}
	203	}
	204	}
	205	}
	206	}
	207	}
	208	for(Int_t i=0;i<nPhiBins;i++) {
	209	delete [] zc1[i];
	210	delete [] phi1[i];
	211	delete [] r1[i];
	212	delete [] zc2[i];
	213	delete [] phi2[i];
	214	delete [] r2[i];
	215	}
	216	delete [] zc1;
	217	delete [] phi1;
	218	delete [] r1;
	219	delete [] ind1;
	220	delete [] zc2;
	221	delete [] phi2;
	222	delete [] r2;
	223	delete [] ind2;
	224
	225	Int_t nbinratio = (Int_t)(fStepCoarse/fStepFine+0.5);
	226	Int_t nbincoarse = nbinfine/nbinratio;
	227
	228	if(fZCombc)delete fZCombc;
	229	fZCombc = new TH1F("fZCombc","Z",nbincoarse,fLowLim,fLowLim+nbincoarse*fStepCoarse);
	230	if(fZCombf)delete fZCombf;
	231	fZCombf = new TH1F("fZCombf","Z",nbinfine,fLowLim,fLowLim+nbinfine*fStepFine);
	232	Stat_t contents=0;
	233	Int_t counter=0;
	234	for(Int_t bin=0;bin<nbinfine;bin++) {
	235	fZCombf->SetBinContent(bin+1,(Stat_t)harray[bin]);
	236	fZCombf->SetBinError(bin+1,TMath::Sqrt((Stat_t)harray[bin]));
	237	contents+=(Stat_t)harray[bin];
	238	counter++;
	239	if(counter==nbinratio) {
	240	Int_t binc=bin/nbinratio;
	241	fZCombc->SetBinContent(binc+1,contents);
	242	fZCombc->SetBinError(binc+1,TMath::Sqrt(contents));
	243	contents=0;
	244	counter=0;
	245	}
	246	}
	247
	248	delete [] harray;
	249
	250	if(fZCombc->GetEntries()==0){
	251	Warning("FindVertexForCurrentEvent","Insufficient number of rec. points\n");
	252	ResetHistograms();
	253	return fCurrentVertex;
	254	}
	255	// else {
	256	// cout<<"Number of entries in hist. "<<fZCombc->GetEntries()<<endl;
	257	// }
	258	Int_t bi = fZCombc->GetMaximumBin();
	259	Float_t centre = fZCombc->GetBinCenter(bi);
	260	Int_t n1 = static_cast<Int_t>((centre-fZCombc->GetBinWidth(bi)-fZCombf->GetBinLowEdge(0))/fZCombf->GetBinWidth(0));
	261	Int_t n2 = static_cast<Int_t>((centre+fZCombc->GetBinWidth(bi)-fZCombf->GetBinLowEdge(0))/fZCombf->GetBinWidth(0));
	262	Int_t niter = 0;
	263	Bool_t goon = kTRUE;
	264	Int_t num;
265	while(goon){
266	fZFound = 0.;
267	fZsig = 0.;
268	num=0;
269	for(Int_t n=n1;n<=n2;n++){
270	fZFound+=fZCombf->GetBinCenter(n)*fZCombf->GetBinContent(n);
271	num+=static_cast<Int_t>(fZCombf->GetBinContent(n));
272	fZsig+=fZCombf->GetBinCenter(n)fZCombf->GetBinCenter(n)fZCombf->GetBinContent(n);
273	}
274	if(num<2){
275	fZsig = 0.;
276	}
277	else {
278	Float_t radi = fZsig/(num-1)-fZFound*fZFound/num/(num-1);
279	if(radi>0.)fZsig=TMath::Sqrt(radi);
280	else fZsig=0.;
281	fZFound/=num;
282	}
283	goon = TMath::Abs(TMath::Abs(fZFound-fZCombf->GetBinCenter(n1))-TMath::Abs(fZFound-fZCombf->GetBinCenter(n2)))>fTolerance;
284	n1 = static_cast<Int_t>((fZFound-fZCombc->GetBinWidth(bi)-fZCombf->GetBinLowEdge(0))/fZCombf->GetBinWidth(0));
285	n2 = static_cast<Int_t>((fZFound+fZCombc->GetBinWidth(bi)-fZCombf->GetBinLowEdge(0))/fZCombf->GetBinWidth(0));
286	niter++;
287	if(niter>=10){
288	goon = kFALSE;
289	Warning("FindVertexForCurrentEvent","The procedure dows not converge\n");
290	}
291	}
292	// cout<<"Numer of Iterations "<<niter<<endl<<endl;
293	fCurrentVertex = new AliESDVertex(fZFound,fZsig,num);
294	fCurrentVertex->SetTitle("vertexer: HLT");
295	ResetHistograms();
296	PrintStatus();
297	return fCurrentVertex;
298	}