--- /dev/null
+/**************************************************************************
+ * 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";
+}
+
--- /dev/null
+#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
git://git.uio.no / u / mrichter / AliRoot.git / commitdiff