Added vertexer AliITSVertexerZD - It retrieves only the Z coordinate with SDD instead...
authormasera <masera@f7af4fe6-9843-0410-8265-dc069ae4e863>
Thu, 17 Jan 2013 15:47:20 +0000 (15:47 +0000)
committermasera <masera@f7af4fe6-9843-0410-8265-dc069ae4e863>
Thu, 17 Jan 2013 15:47:20 +0000 (15:47 +0000)
ITS/AliITSReconstructor.cxx
ITS/AliITSVertexerZD.cxx [new file with mode: 0644]
ITS/AliITSVertexerZD.h [new file with mode: 0644]
ITS/CMakelibITSrec.pkg
ITS/ITSrecLinkDef.h

index 2f292b6..3d7129f 100644 (file)
@@ -36,6 +36,7 @@
 #include "AliITSVertexerFixed.h"
 #include "AliITSVertexer3D.h"
 #include "AliITSVertexerZ.h"
+#include "AliITSVertexerZD.h"
 #include "AliITSVertexerCosmics.h"
 #include "AliITSInitGeometry.h"
 #include "AliITSTrackleterSPDEff.h"
@@ -218,6 +219,12 @@ AliVertexer* AliITSReconstructor::CreateVertexer() const
     AliDebug(1,"Vertex is fixed in the position of the TED\n");
     vptr = new AliITSVertexerFixed("TED");
   }
+  else if(vtxOpt==7){
+    AliDebug(1,"VertexerZD:  reconstruction of the Z coordinate with SDD \n");
+    AliITSVertexerZD*vtxrz = new AliITSVertexerZD();
+    vtxrz->SetSearchForPileup(kFALSE);
+    vptr = vtxrz;
+  }
   else {
   // by default an AliITSVertexer3D object is instatiated
     AliITSVertexer3D*  vtxr = 
diff --git a/ITS/AliITSVertexerZD.cxx b/ITS/AliITSVertexerZD.cxx
new file mode 100644 (file)
index 0000000..d5fa71e
--- /dev/null
@@ -0,0 +1,444 @@
+/**************************************************************************
+ * Copyright(c) 1998-2003, 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 "AliITSVertexerZD.h"
+#include<TBranch.h>
+#include<TClonesArray.h>
+#include<TH1.h>
+#include <TString.h>
+#include<TTree.h>
+#include "AliESDVertex.h"
+#include "AliITSgeomTGeo.h"
+#include "AliITSRecPoint.h"
+#include "AliITSRecPointContainer.h"
+#include "AliITSZPoint.h"
+
+/////////////////////////////////////////////////////////////////
+// this class implements a fast method to determine
+// the Z coordinate of the primary vertex
+// it is based on the 2 layers of SDD detectors
+// wider Z acceptance w.r.t. AliITSVertexerZ
+// lower resolution
+// origin masera@to.infn.it
+////////////////////////////////////////////////////////////////
+
+using std::endl;
+using std::cout;
+ClassImp(AliITSVertexerZD)
+
+
+
+//______________________________________________________________________
+AliITSVertexerZD::AliITSVertexerZD():AliITSVertexer(),
+fFirstL1(0),
+fLastL1(0),
+fFirstL2(0),
+fLastL2(0),
+fDiffPhiMax(0),
+fZFound(0),
+fZsig(0.),
+fZCombc(0),
+fLowLim(0.),
+fHighLim(0.),
+fStepCoarse(0),
+fTolerance(0.),
+fMaxIter(0),
+fWindowWidth(0),
+fSearchForPileup(kTRUE)
+{
+  // Default constructor
+  SetDiffPhiMax();
+  SetFirstLayerModules();
+  SetSecondLayerModules();
+  SetLowLimit();
+  SetHighLimit();
+  SetBinWidthCoarse();
+  SetTolerance();
+  SetPPsetting();
+  ConfigIterations();
+  SetWindowWidth();
+}
+
+//______________________________________________________________________
+AliITSVertexerZD::AliITSVertexerZD(Float_t x0, Float_t y0):AliITSVertexer(),
+fFirstL1(0),
+fLastL1(0),
+fFirstL2(0),
+fLastL2(0),
+fDiffPhiMax(0),
+fZFound(0),
+fZsig(0.),
+fZCombc(0),
+fLowLim(0.),
+fHighLim(0.),
+fStepCoarse(0),
+fTolerance(0.),
+fMaxIter(0),
+fWindowWidth(0),
+fSearchForPileup(kTRUE)
+{
+  // Standard Constructor
+  SetDiffPhiMax();
+  SetFirstLayerModules();
+  SetSecondLayerModules();
+  SetLowLimit();
+  SetHighLimit();
+  SetBinWidthCoarse();
+  SetTolerance();
+  SetPPsetting();
+  ConfigIterations();
+  SetWindowWidth();
+  SetVtxStart((Double_t)x0,(Double_t)y0,0.);
+
+}
+
+//______________________________________________________________________
+AliITSVertexerZD::~AliITSVertexerZD() {
+  // Destructor
+  delete fZCombc;
+}
+
+//______________________________________________________________________
+void AliITSVertexerZD::ConfigIterations(Int_t noiter,Float_t *ptr){
+  // configure the iterative procedure to gain efficiency for
+  // pp events with very low multiplicity
+  Float_t defaults[5]={0.02,0.05,0.1,0.2,0.3};
+  fMaxIter=noiter;
+  if(noiter>5){
+    Error("ConfigIterations","Maximum number of iterations is 5\n");
+    fMaxIter=5;
+  }
+  for(Int_t j=0;j<5;j++)fPhiDiffIter[j]=defaults[j];
+  if(ptr)for(Int_t j=0;j<fMaxIter;j++)fPhiDiffIter[j]=ptr[j];
+}
+
+//______________________________________________________________________
+Int_t AliITSVertexerZD::GetPeakRegion(TH1F*h, Int_t &binmin, Int_t &binmax){
+  // Finds a region around a peak in the Z histogram
+  // Case of 2 peaks is treated 
+  Int_t imax=h->GetNbinsX();
+  Float_t maxval=0;
+  Int_t bi1=h->GetMaximumBin();
+  Int_t bi2=0;
+  for(Int_t i=imax;i>=1;i--){
+    if(h->GetBinContent(i)>maxval){
+      maxval=h->GetBinContent(i);
+      bi2=i;
+    }
+  }
+  Int_t npeaks=0;
+
+  if(bi1==bi2){
+    binmin=bi1-3;
+    binmax=bi1+3;
+    npeaks=1;
+  }else{
+    TH1F *copy = new TH1F(*h);
+    copy->SetBinContent(bi1,0.);
+    copy->SetBinContent(bi2,0.);
+    Int_t l1=TMath::Max(bi1-3,1);
+    Int_t l2=TMath::Min(bi1+3,h->GetNbinsX());
+    Float_t cont1=copy->Integral(l1,l2);
+    Int_t ll1=TMath::Max(bi2-3,1);
+    Int_t ll2=TMath::Min(bi2+3,h->GetNbinsX());
+    Float_t cont2=copy->Integral(ll1,ll2);
+    if(cont1>cont2){
+      binmin=l1;
+      binmax=l2;
+      npeaks=1;
+    }
+    if(cont2>cont1){
+      binmin=ll1;
+      binmax=ll2;
+      npeaks=1;
+    }
+    if(cont1==cont2){
+      binmin=l1;
+      binmax=ll2;
+      if(bi2-bi1==1) npeaks=1;
+      else npeaks=2;
+    }  
+    delete copy;
+  }    
+  return npeaks;
+}
+//______________________________________________________________________
+AliESDVertex* AliITSVertexerZD::FindVertexForCurrentEvent(TTree *itsClusterTree){
+  // Defines the AliESDVertex for the current event
+  VertexZFinder(itsClusterTree);
+  Int_t ntrackl=0;
+  for(Int_t iteraz=0;iteraz<fMaxIter;iteraz++){
+    if(fCurrentVertex) ntrackl=fCurrentVertex->GetNContributors();
+    if(!fCurrentVertex || ntrackl==0 || ntrackl==-1){
+      Float_t diffPhiMaxOrig=fDiffPhiMax;
+      fDiffPhiMax=GetPhiMaxIter(iteraz);
+      VertexZFinder(itsClusterTree);
+      fDiffPhiMax=diffPhiMaxOrig;
+    }
+  }
+  if(fComputeMultiplicity) FindMultiplicity(itsClusterTree);
+  return fCurrentVertex;
+}  
+
+//______________________________________________________________________
+void AliITSVertexerZD::VertexZFinder(TTree *itsClusterTree){
+  // Defines the AliESDVertex for the current event
+  //debug  printf("===========  VertexZFinder has been called \n");
+  fCurrentVertex = 0;
+  Double_t startPos[3]={GetNominalPos()[0],GetNominalPos()[1],GetNominalPos()[2]};
+  Double_t startCov[6]={GetNominalCov()[0],GetNominalCov()[1],GetNominalCov()[2],
+                       GetNominalCov()[3],GetNominalCov()[4],GetNominalCov()[5]};
+  ResetVertex();
+  TClonesArray *itsRec  = 0;
+  // lc1 and gc1 are local and global coordinates for layer 1
+  Float_t gc1[3]={0.,0.,0.}; // ; for(Int_t ii=0; ii<3; ii++) gc1[ii]=0.;
+  // lc2 and gc2 are local and global coordinates for layer 2
+  Float_t gc2[3]={0.,0.,0.}; //; for(Int_t ii=0; ii<3; ii++) gc2[ii]=0.;
+  AliITSRecPointContainer* rpcont=AliITSRecPointContainer::Instance();
+  rpcont->FetchClusters(0,itsClusterTree);
+  if(!rpcont->IsSDDActive()){
+    AliWarning("Null pointer for RecPoints branch, vertex not calculated");
+    ResetHistograms();
+    fCurrentVertex = new AliESDVertex(startPos,startCov,99999.,-2);
+    return;
+  }
+
+  Int_t nrpL1 = 0;
+  Int_t nrpL2 = 0;
+  nrpL1=rpcont->GetNClustersInLayerFast(3);
+  nrpL2=rpcont->GetNClustersInLayerFast(4);
+
+  if(nrpL1 == 0 || nrpL2 == 0){
+    AliDebug(1,Form("No RecPoints in at least one SDD layer (%d %d)",nrpL1,nrpL2));
+    ResetHistograms();
+    fCurrentVertex = new AliESDVertex(startPos,startCov,99999.,-2);
+    return;
+  }
+  // Force a coarse bin size of 200 microns if the number of clusters on layer 2
+  // is low
+  if(nrpL2<fPPsetting[0])SetBinWidthCoarse(fPPsetting[1]);
+  // By default nbincoarse=(10+10)/0.01=2000
+  Int_t nbincoarse = static_cast<Int_t>((fHighLim-fLowLim)/fStepCoarse);
+  if(fZCombc)delete fZCombc;
+  fZCombc = new TH1F("fZCombc","Z",nbincoarse,fLowLim,fLowLim+nbincoarse*fStepCoarse);
+
+
+  Int_t nEntriesMod[260];
+  TClonesArray* recpArr[260];
+  for(Int_t modul=0; modul<260; ++modul) {
+      recpArr[modul]=rpcont->UncheckedGetClusters(modul+240);
+      nEntriesMod[modul]=recpArr[modul]->GetEntriesFast();
+  }
+      
+  Int_t maxdim=TMath::Min(nrpL1*nrpL2,50000);  // temporary; to limit the size in PbPb
+  static TClonesArray points("AliITSZPoint",maxdim);
+  Int_t nopoints =0;
+  for(Int_t modul1= fFirstL1; modul1<=fLastL1;modul1++){   // Loop on modules of layer 1
+    //    UShort_t ladder=int(modul1/6)+1;  // ladders are numbered starting from 1
+    TClonesArray *prpl1=recpArr[modul1-240]; //rpcont->UncheckedGetClusters(modul1);
+    Int_t nrecp1 = nEntriesMod[modul1-240]; //prpl1->GetEntries();
+    for(Int_t j1=0;j1<nrecp1;j1++){
+      AliITSRecPoint *recp1 = (AliITSRecPoint*)prpl1->At(j1);
+      recp1->GetGlobalXYZ(gc1);
+      gc1[0]-=GetNominalPos()[0]; // Possible beam offset in the bending plane
+      gc1[1]-=GetNominalPos()[1]; //   "               "
+      Float_t phi1 = TMath::ATan2(gc1[1],gc1[0]);
+      if(phi1<0)phi1+=TMath::TwoPi();
+      for(Int_t modul2=fFirstL2;modul2<=fLastL2;modul2++){
+         itsRec=recpArr[modul2-240]; // rpcont->UncheckedGetClusters(modul2);
+         Int_t nrecp2 = nEntriesMod[modul2-240]; // itsRec->GetEntries();
+         for(Int_t j2=0;j2<nrecp2;j2++){
+           AliITSRecPoint *recp2 = (AliITSRecPoint*)itsRec->At(j2);
+           recp2->GetGlobalXYZ(gc2);
+           gc2[0]-=GetNominalPos()[0];
+           gc2[1]-=GetNominalPos()[1];
+           Float_t phi2 = TMath::ATan2(gc2[1],gc2[0]);
+           if(phi2<0)phi2+=TMath::TwoPi();
+
+           Float_t diff = TMath::Abs(phi2-phi1); 
+           if(diff>TMath::Pi())diff=TMath::TwoPi()-diff;
+           if(diff<fDiffPhiMax){
+             //=================   DEBUG
+             /*              Bool_t goodMatch = kFALSE;
+             for(Int_t kl1=0;kl1<3;kl1++){
+               Int_t label1=recp1->GetLabel(kl1);
+               if(label1>0){
+                 for(Int_t kl2=0;kl2<3;kl2++){
+                   if(label1 == recp2->GetLabel(kl2))goodMatch = kTRUE;
+                 }
+               }
+             }
+             */
+             //=================   END DEBUG
+             Float_t r1=TMath::Sqrt(gc1[0]*gc1[0]+gc1[1]*gc1[1]);
+             Float_t zc1=gc1[2];
+             Float_t erz1=recp1->GetSigmaZ2();
+             Float_t r2=TMath::Sqrt(gc2[0]*gc2[0]+gc2[1]*gc2[1]);
+             //debug         printf("r1 =%f ; r2=%f \n",r1,r2);
+             Float_t zc2=gc2[2];
+             Float_t erz2=recp2->GetSigmaZ2();
+             //        Float_t tgth=(zc2[j]-zc1[i])/(r2-r1); // slope (used for multiple scattering)
+             Float_t zr0=(r2*zc1-r1*zc2)/(r2-r1); //Z @ null radius
+             Float_t ezr0q=(r2*r2*erz1+r1*r1*erz2)/((r2-r1)*(r2-r1)); //error on Z @ null radius
+             /*
+             if(goodMatch)printf("Good tracklet: z0=%f, ezr0q=%f\n",zr0,ezr0q);
+             else printf("Fake tracklet: z0=%f, ezr0q=%f\n",zr0,ezr0q);
+             if(goodMatch){
+               printf("Labels: ");
+               for(Int_t kkk=0;kkk<3;kkk++)printf("%d ",recp1->GetLabel(kkk));
+               for(Int_t kkk=0;kkk<3;kkk++)printf("%d ",recp1->GetLabel(kkk));
+             }
+             printf("\n");
+             if(nopoints<maxdim) new(points[nopoints++])AliITSZPoint(zr0,ezr0q,goodMatch);
+             */
+             if(nopoints<maxdim) new(points[nopoints++])AliITSZPoint(zr0,ezr0q);  
+             fZCombc->Fill(zr0);
+           }
+         }
+      }
+    }
+  }
+  points.Sort();
+
+  Double_t contents = fZCombc->GetEntries()- fZCombc->GetBinContent(0)-fZCombc->GetBinContent(nbincoarse+1);
+  if(contents<1.){
+    //    Warning("FindVertexForCurrentEvent","Insufficient number of rec. points\n");
+    ResetHistograms();
+    fCurrentVertex = new AliESDVertex(startPos,startCov,99999.,-1);
+    points.Clear();
+    return;
+  }
+
+  TH1F *hc = fZCombc;
+
+  
+  if(hc->GetBinContent(hc->GetMaximumBin())<3)hc->Rebin(4);
+  Int_t binmin,binmax;
+  Int_t nPeaks=GetPeakRegion(hc,binmin,binmax);   
+  if(nPeaks==2)AliDebug(2,"2 peaks found");
+  Float_t zm =0.;
+  Float_t ezm =0.;
+  Float_t lim1 = hc->GetBinLowEdge(binmin);
+  Float_t lim2 = hc->GetBinLowEdge(binmax)+hc->GetBinWidth(binmax);
+  Float_t widthSR=lim2-lim1;
+
+  if(nPeaks ==1 && (lim2-lim1)<fWindowWidth){
+    Float_t c=(lim1+lim2)/2.;
+    lim1=c-fWindowWidth/2.;
+    lim2=c+fWindowWidth/2.;
+  }
+  Int_t niter = 0, ncontr=0;
+  do {
+    // symmetrization
+    if(zm  !=0.){
+      Float_t semilarg=TMath::Min((lim2-zm),(zm-lim1));
+      lim1=zm - semilarg;
+      lim2=zm + semilarg;
+    }
+    
+    zm=0.;
+    ezm=0.;
+    ncontr=0;
+    for(Int_t i =0; i<points.GetEntriesFast(); i++){
+      AliITSZPoint* p=(AliITSZPoint*)points.UncheckedAt(i);
+      if(p->GetZ()>lim1 && p->GetZ()<lim2){
+        Float_t deno = p->GetErrZ();
+        zm+=p->GetZ()/deno;
+        ezm+=1./deno;
+        ncontr++;
+      }
+    }
+    if(ezm>0) {
+      zm/=ezm;
+      ezm=TMath::Sqrt(1./ezm);
+    }
+    niter++;
+  } while(niter<10 && TMath::Abs((zm-lim1)-(lim2-zm))>fTolerance);
+  if(nPeaks==2) ezm=widthSR;
+  Double_t position[3]={GetNominalPos()[0],GetNominalPos()[1],zm};
+  Double_t covmatrix[6]={GetNominalCov()[0],0.,GetNominalCov()[2],0.,0.,ezm};
+  fCurrentVertex = new AliESDVertex(position,covmatrix,99999.,ncontr);
+  fCurrentVertex->SetTitle("vertexer: Z");
+  fCurrentVertex->SetDispersion(fDiffPhiMax);
+  fNoVertices=1;
+  points.Clear();
+  if(fSearchForPileup && ncontr>fMinTrackletsForPilup){ 
+    Float_t secPeakPos;
+    Int_t ncontr2=FindSecondPeak(fZCombc,binmin,binmax,secPeakPos);
+    if(ncontr2>=fMinTrackletsForPilup){ 
+      fIsPileup=kTRUE;
+      fNoVertices=2;
+      fZpuv=secPeakPos;
+      fNTrpuv=ncontr2;
+      AliESDVertex secondVert(secPeakPos,0.1,ncontr2);
+      fVertArray = new AliESDVertex[2];
+      fVertArray[0]=(*fCurrentVertex);
+      fVertArray[1]=secondVert;
+    }
+  }
+  if(fNoVertices==1){
+    fVertArray = new AliESDVertex[1];
+    fVertArray[0]=(*fCurrentVertex);     
+  }
+  
+  ResetHistograms();
+  return;
+}
+
+//_____________________________________________________________________
+Int_t AliITSVertexerZD::FindSecondPeak(TH1F* h, Int_t binmin,Int_t binmax, Float_t& secPeakPos){ 
+  // Resets bin contents between binmin and binmax and then search 
+  // for a second peak position 
+  for(Int_t i=binmin-1;i<=binmax+1;i++){
+    h->SetBinContent(i,0.);
+  }
+  Int_t secPeakBin=h->GetMaximumBin();
+  secPeakPos=h->GetBinCenter(secPeakBin);
+  Int_t secPeakCont=(Int_t)h->GetBinContent(secPeakBin);
+  secPeakCont+=(Int_t)h->GetBinContent(secPeakBin-1);
+  secPeakCont+=(Int_t)h->GetBinContent(secPeakBin+1);  
+  secPeakCont+=(Int_t)h->GetBinContent(secPeakBin-2);
+  secPeakCont+=(Int_t)h->GetBinContent(secPeakBin+2);  
+  return secPeakCont;
+}
+
+//_____________________________________________________________________
+void AliITSVertexerZD::ResetHistograms(){
+  // delete TH1 data members
+  if(fZCombc)delete fZCombc;
+  fZCombc = 0;
+}
+
+//________________________________________________________
+void AliITSVertexerZD::PrintStatus() const {
+  // Print current status
+  cout <<"=======================================================\n";
+  cout <<" First layer first and last modules: "<<fFirstL1<<", ";
+  cout <<fLastL1<<endl;
+  cout <<" Second layer first and last modules: "<<fFirstL2<<", ";
+  cout <<fLastL2<<endl;
+  cout <<" Max Phi difference: "<<fDiffPhiMax<<endl;
+  cout <<"Limits for Z histograms: "<<fLowLim<<"; "<<fHighLim<<endl;
+  cout <<"Bin sizes for coarse z histos "<<fStepCoarse<<endl;
+  cout <<" Current Z "<<fZFound<<"; Z sig "<<fZsig<<endl;
+  if(fZCombc){
+    cout<<"fZCombc exists - entries="<<fZCombc->GetEntries()<<endl;
+  }
+  else{
+    cout<<"fZCombc does not exist\n";
+  }
+  cout <<"=======================================================\n";
+}
+
diff --git a/ITS/AliITSVertexerZD.h b/ITS/AliITSVertexerZD.h
new file mode 100644 (file)
index 0000000..6027d57
--- /dev/null
@@ -0,0 +1,84 @@
+#ifndef ALIITSVERTEXERZD_H
+#define ALIITSVERTEXERZD_H
+
+#include<AliITSVertexer.h>
+
+///////////////////////////////////////////////////////////////////
+//                                                               //
+// Class for primary vertex finding with SDD                     //
+//                                                               //
+///////////////////////////////////////////////////////////////////
+
+class TFile;
+class TString;
+class AliESDVertex;
+class TH1F;
+
+class AliITSVertexerZD : public AliITSVertexer {
+
+ public:
+
+  AliITSVertexerZD();
+  AliITSVertexerZD(Float_t x0, Float_t y0);
+  virtual ~AliITSVertexerZD();
+  // The number of contributors set in the AliESDVertex object is the
+  // number of tracklets used to determine the vertex position
+  // If this number is <1, the procedure could not find a vertex position
+  // and by default the Z coordinate is set to 0
+  // Number of contributors = -1  --> No tracklets 
+  // Number of contributors = -2  --> No SDD recpoints
+  virtual AliESDVertex* FindVertexForCurrentEvent(TTree *itsClusterTree);
+  virtual void PrintStatus() const;
+  void SetDiffPhiMax(Float_t pm = 0.1){fDiffPhiMax = pm;}
+  void ConfigIterations(Int_t noiter=4,Float_t *ptr=0);
+  void SetFirstLayerModules(Int_t m1 = 240, Int_t m2 = 323){fFirstL1 = m1; fLastL1 = m2;}
+  void SetSecondLayerModules(Int_t m1 = 324, Int_t m2 = 499){fFirstL2 = m1; fLastL2 = m2;}
+  void SetLowLimit(Float_t lim=-70.){fLowLim = lim;}
+  void SetHighLimit(Float_t lim=70.){fHighLim = lim;}
+  Float_t GetLowLimit() const {return fLowLim;}
+  Float_t GetHighLimit() const {return fHighLim;}
+  void SetBinWidthCoarse(Float_t bw=0.01){fStepCoarse = bw;}
+  void SetPPsetting(Float_t cl2=250., Float_t coarsebin=0.02){fPPsetting[0]=cl2; fPPsetting[1]=coarsebin;}
+  static Int_t GetPeakRegion(TH1F* h, Int_t &binmin, Int_t &binmax);
+  static Int_t FindSecondPeak(TH1F* h, Int_t binmin,Int_t binmax, Float_t& secPeakPos);
+  Float_t GetBinWidthCoarse() const {return fStepCoarse;}
+  void SetTolerance(Float_t tol = 20./10000.){fTolerance = tol;}
+  void SetWindowWidth(Float_t ww=0.2){fWindowWidth=ww;}
+  Float_t GetTolerance() const {return fTolerance;}
+  //  virtual void MakeTracklet(Double_t * /* pA */, Double_t * /*pB */, Int_t & /* nolines */) {} // implemented in a derived class
+
+  void SetSearchForPileup(Bool_t opt){fSearchForPileup=opt;}
+  Bool_t IsSearchForPileupActive() const { return fSearchForPileup;}
+
+ protected:
+  void ResetHistograms();
+  void VertexZFinder(TTree *itsClusterTree);
+  Float_t GetPhiMaxIter(Int_t i) const {return fPhiDiffIter[i];}
+
+
+  Int_t fFirstL1;          // first module of the first pixel layer used
+  Int_t fLastL1;           // last module of the first pixel layer used
+  Int_t fFirstL2;          // first module of the second pixel layer used
+  Int_t fLastL2;           // last module of the second pixel layer used
+  Float_t fDiffPhiMax;     // Maximum delta phi allowed among corr. pixels
+  Float_t fZFound;         //! found value for the current event
+  Float_t fZsig;           //! RMS of Z
+  TH1F *fZCombc;           //! histogram with coarse z distribution
+  Float_t fLowLim;         // low limit for fZComb histograms
+  Float_t fHighLim;        // high limit for fZComb histograms
+  Float_t fStepCoarse;     // bin width for fZCombc
+  Float_t fTolerance;      // tolerance on the symmetry of the Z interval 
+  Float_t fPPsetting[2];   // [0] is the max. number of clusters on L2 to use [1] as fStepCoarse
+  Int_t fMaxIter;            // Maximum number of iterations (<=5)
+  Float_t fPhiDiffIter[5];   // Delta phi used in iterations
+  Float_t fWindowWidth;      // Z window width for symmetrization
+  Bool_t  fSearchForPileup;  // flag to switch pileup off/on
+
+ private:
+  AliITSVertexerZD(const AliITSVertexerZD& vtxr);
+  AliITSVertexerZD& operator=(const AliITSVertexerZD& vtxr );
+
+  ClassDef(AliITSVertexerZD,1);
+};
+
+#endif
index ba90f84..6a034ce 100644 (file)
@@ -48,6 +48,7 @@ set ( SRCS
     AliITSTracklPairs.cxx 
     AliITSSortTrkl.cxx 
     AliITSVertexerZ.cxx 
+    AliITSVertexerZD.cxx
     AliITSVertexerFast.cxx 
     AliITSVertexerFixed.cxx 
     AliITSVertexer3DTapan.cxx 
index 3d6a39e..03f96b9 100644 (file)
@@ -34,6 +34,7 @@
 #pragma link C++ class  AliITSVertexer+;
 #pragma link C++ class  AliITSVertexerCosmics+;
 #pragma link C++ class  AliITSVertexerZ+;
+#pragma link C++ class  AliITSVertexerZD+;
 #pragma link C++ class  AliITSVertexer3D+;
 #pragma link C++ class  AliITSVertexer3DTapan+;
 #pragma link C++ class  AliITSTracklPairs+;