#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"
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)
{
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)
{
SetDiffPhiMax();
SetFirstLayerModules();
SetSecondLayerModules();
SetLowLimit();
SetHighLimit();
SetBinWidthCoarse();
SetTolerance();
SetPPsetting();
ConfigIterations();
SetWindowWidth();
SetVtxStart((Double_t)x0,(Double_t)y0,0.);
}
AliITSVertexerZD::~AliITSVertexerZD() {
delete fZCombc;
}
void AliITSVertexerZD::ConfigIterations(Int_t noiter,Float_t *ptr){
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){
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){
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){
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;
Float_t gc1[3]={0.,0.,0.};
Float_t gc2[3]={0.,0.,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;
}
if(nrpL2<fPPsetting[0])SetBinWidthCoarse(fPPsetting[1]);
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);
static TClonesArray points("AliITSZPoint",maxdim);
Int_t nopoints =0;
for(Int_t modul1= fFirstL1; modul1<=fLastL1;modul1++){
TClonesArray *prpl1=recpArr[modul1-240];
Int_t nrecp1 = nEntriesMod[modul1-240];
for(Int_t j1=0;j1<nrecp1;j1++){
AliITSRecPoint *recp1 = (AliITSRecPoint*)prpl1->At(j1);
recp1->GetGlobalXYZ(gc1);
gc1[0]-=GetNominalPos()[0];
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];
Int_t nrecp2 = nEntriesMod[modul2-240];
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){
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]);
Float_t zc2=gc2[2];
Float_t erz2=recp2->GetSigmaZ2();
Float_t zr0=(r2*zc1-r1*zc2)/(r2-r1);
Float_t ezr0q=(r2*r2*erz1+r1*r1*erz2)/((r2-r1)*(r2-r1));
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.){
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 {
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){
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(){
if(fZCombc)delete fZCombc;
fZCombc = 0;
}
void AliITSVertexerZD::PrintStatus() const {
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";
}