* about the suitability of this software for any purpose. It is *
* provided "as is" without express or implied warranty. *
**************************************************************************/
-#include <AliITSVertexerZ.h>
-#include <TString.h>
-#include <AliITSLoader.h>
+#include "AliITSVertexerZ.h"
#include<TBranch.h>
+#include<TClonesArray.h>
#include<TH1.h>
+#include <TString.h>
#include<TTree.h>
-#include <AliITSgeom.h>
-#include "AliITSDetTypeRec.h"
-#include <AliITSRecPoint.h>
+#include "AliESDVertex.h"
+#include "AliITSgeomTGeo.h"
+#include "AliITSRecPoint.h"
+#include "AliITSRecPointContainer.h"
+#include "AliITSZPoint.h"
/////////////////////////////////////////////////////////////////
// this class implements a fast method to determine
//______________________________________________________________________
-AliITSVertexerZ::AliITSVertexerZ():AliITSVertexer() {
+AliITSVertexerZ::AliITSVertexerZ():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) {
// Default constructor
- SetDiffPhiMax(0);
- fX0 = 0.;
- fY0 = 0.;
- SetFirstLayerModules(0);
- SetSecondLayerModules(0);
- fZFound = 0;
- fZsig = 0.;
- fZCombc = 0;
- fZCombf = 0;
- fZCombv = 0;
- SetLowLimit(0.);
- SetHighLimit(0.);
- SetBinWidthCoarse(0.);
- SetBinWidthFine(0.);
- SetTolerance(0.);
- SetPPsetting(0.,0.);
+ SetDiffPhiMax();
+ SetFirstLayerModules();
+ SetSecondLayerModules();
+ SetLowLimit();
+ SetHighLimit();
+ SetBinWidthCoarse();
+ SetTolerance();
+ SetPPsetting();
ConfigIterations();
+ SetWindowWidth();
}
//______________________________________________________________________
-AliITSVertexerZ::AliITSVertexerZ(TString fn, Float_t x0, Float_t y0):AliITSVertexer(fn) {
+AliITSVertexerZ::AliITSVertexerZ(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) {
// Standard Constructor
SetDiffPhiMax();
- fX0 = x0;
- fY0 = y0;
SetFirstLayerModules();
SetSecondLayerModules();
- fZFound = 0;
- fZsig = 0.;
- fZCombc = 0;
- fZCombf = 0;
- fZCombv = 0;
SetLowLimit();
SetHighLimit();
SetBinWidthCoarse();
- SetBinWidthFine();
SetTolerance();
SetPPsetting();
ConfigIterations();
+ SetWindowWidth();
+ SetVtxStart((Double_t)x0,(Double_t)y0,0.);
}
-//______________________________________________________________________
-AliITSVertexerZ::AliITSVertexerZ(const AliITSVertexerZ &vtxr) : AliITSVertexer(vtxr) {
- // Copy constructor
- // Copies are not allowed. The method is protected to avoid misuse.
- Error("AliITSVertexerZ","Copy constructor not allowed\n");
-}
-
-//______________________________________________________________________
-AliITSVertexerZ& AliITSVertexerZ::operator=(const AliITSVertexerZ& /* vtxr */){
- // Assignment operator
- // Assignment is not allowed. The method is protected to avoid misuse.
- Error("= operator","Assignment operator not allowed\n");
- return *this;
-}
-
//______________________________________________________________________
AliITSVertexerZ::~AliITSVertexerZ() {
// Destructor
delete fZCombc;
- delete fZCombf;
- delete fZCombv;
}
//______________________________________________________________________
void AliITSVertexerZ::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]={0.05,0.1,0.2,0.3,0.5};
+ 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");
}
//______________________________________________________________________
-AliESDVertex* AliITSVertexerZ::FindVertexForCurrentEvent(Int_t evnumber){
+Int_t AliITSVertexerZ::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* AliITSVertexerZ::FindVertexForCurrentEvent(TTree *itsClusterTree){
// Defines the AliESDVertex for the current event
- VertexZFinder(evnumber);
+ 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(evnumber);
+ VertexZFinder(itsClusterTree);
fDiffPhiMax=diffPhiMaxOrig;
}
}
- FindMultiplicity(evnumber);
+ if(fComputeMultiplicity) FindMultiplicity(itsClusterTree);
return fCurrentVertex;
}
-
-
-
//______________________________________________________________________
-void AliITSVertexerZ::VertexZFinder(Int_t evnumber){
+void AliITSVertexerZ::VertexZFinder(TTree *itsClusterTree){
// Defines the AliESDVertex for the current event
fCurrentVertex = 0;
- AliRunLoader *rl =AliRunLoader::GetRunLoader();
- AliITSLoader* itsLoader = (AliITSLoader*)rl->GetLoader("ITSLoader");
- AliITSgeom* geom = itsLoader->GetITSgeom();
- itsLoader->LoadRecPoints();
- rl->GetEvent(evnumber);
-
- AliITSDetTypeRec detTypeRec;
-
- TTree *tR = itsLoader->TreeR();
- detTypeRec.SetTreeAddressR(tR);
+ 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;
- // lc and gc are local and global coordinates for layer 1
- 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.;
+ // 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 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.;
-
- itsRec = detTypeRec.RecPoints();
- TBranch *branch;
- branch = tR->GetBranch("ITSRecPoints");
+ 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->IsSPDActive()){
+ 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;
- // By default fFirstL1=0 and fLastL1=79
- // This loop counts the number of recpoints on layer1 (central modules)
- for(Int_t module= fFirstL1; module<=fLastL1;module++){
- // Keep only central modules
- if(module%4==0 || module%4==3)continue;
- // cout<<"Procesing module "<<module<<" ";
- branch->GetEvent(module);
- // cout<<"Number of clusters "<<clusters->GetEntries()<<endl;
- nrpL1+= itsRec->GetEntries();
- detTypeRec.ResetRecPoints();
- }
- //By default fFirstL2=80 and fLastL2=239
- //This loop counts the number of RP on layer 2
- for(Int_t module= fFirstL2; module<=fLastL2;module++){
- branch->GetEvent(module);
- nrpL2+= itsRec->GetEntries();
- detTypeRec.ResetRecPoints();
- }
+ nrpL1=rpcont->GetNClustersInLayerFast(1);
+ nrpL2=rpcont->GetNClustersInLayerFast(2);
+
if(nrpL1 == 0 || nrpL2 == 0){
+ AliDebug(1,Form("No RecPoints in at least one SPD layer (%d %d)",nrpL1,nrpL2));
ResetHistograms();
- itsLoader->UnloadRecPoints();
- fCurrentVertex = new AliESDVertex(0.,5.3,-2);
+ fCurrentVertex = new AliESDVertex(startPos,startCov,99999.,-2);
return;
}
- // The vertex finding is attempted only if the number of RP is !=0 on
- // both layers
- Float_t *xc1 = new Float_t [nrpL1]; // coordinates of the L1 Recpoints
- Float_t *yc1 = new Float_t [nrpL1];
- Float_t *zc1 = new Float_t [nrpL1];
- Float_t *phi1 = new Float_t [nrpL1];
- Float_t *xc2 = new Float_t [nrpL2]; // coordinates of the L1 Recpoints
- Float_t *yc2 = new Float_t [nrpL2];
- Float_t *zc2 = new Float_t [nrpL2];
- Float_t *phi2 = new Float_t [nrpL2];
- Int_t ind = 0;// running index for RP
// 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 nbinfine = (10+10)/0.0005=40000
- Int_t nbinfine = static_cast<Int_t>((fHighLim-fLowLim)/fStepFine);
// By default nbincoarse=(10+10)/0.01=2000
Int_t nbincoarse = static_cast<Int_t>((fHighLim-fLowLim)/fStepCoarse);
- // Set stepverycoarse = 3*fStepCoarse
- Int_t nbinvcoarse = static_cast<Int_t>((fHighLim-fLowLim)/(3.*fStepCoarse));
if(fZCombc)delete fZCombc;
fZCombc = new TH1F("fZCombc","Z",nbincoarse,fLowLim,fLowLim+nbincoarse*fStepCoarse);
- if(fZCombv)delete fZCombv;
- fZCombv = new TH1F("fZCombv","Z",nbinvcoarse,fLowLim,fLowLim+nbinvcoarse*3.*fStepCoarse);
- if(fZCombf)delete fZCombf;
- fZCombf = new TH1F("fZCombf","Z",nbinfine,fLowLim,fLowLim+nbinfine*fStepFine);
- // Loop on modules of layer 1 (restricted to central modules)
- for(Int_t module= fFirstL1; module<=fLastL1;module++){
- if(module%4==0 || module%4==3)continue;
- branch->GetEvent(module);
- Int_t nrecp1 = itsRec->GetEntries();
- for(Int_t j=0;j<nrecp1;j++){
- AliITSRecPoint *recp = (AliITSRecPoint*)itsRec->At(j);
- // Local coordinates of this recpoint
- lc[0]=recp->GetDetLocalX();
- lc[2]=recp->GetDetLocalZ();
- geom->LtoG(module,lc,gc);
- // Global coordinates of this recpoints
- gc[0]-=fX0; // Possible beam offset in the bending plane
- gc[1]-=fY0; // " "
- xc1[ind]=gc[0];
- yc1[ind]=gc[1];
- zc1[ind]=gc[2];
- // azimuthal angle is computed in the interval 0 --> 2*pi
- phi1[ind] = TMath::ATan2(gc[1],gc[0]);
- if(phi1[ind]<0)phi1[ind]=2*TMath::Pi()+phi1[ind];
- ind++;
- }
- detTypeRec.ResetRecPoints();
- }
- ind = 0; // the running index is reset for Layer 2
- for(Int_t module= fFirstL2; module<=fLastL2;module++){
- branch->GetEvent(module);
- Int_t nrecp2 = itsRec->GetEntries();
- for(Int_t j=0;j<nrecp2;j++){
- AliITSRecPoint *recp = (AliITSRecPoint*)itsRec->At(j);
- lc[0]=recp->GetDetLocalX();
- lc[2]=recp->GetDetLocalZ();
- geom->LtoG(module,lc,gc);
- gc[0]-=fX0;
- gc[1]-=fY0;
- xc2[ind]=gc[0];
- yc2[ind]=gc[1];
- zc2[ind]=gc[2];
- phi2[ind] = TMath::ATan2(gc[1],gc[0]);
- if(phi2[ind]<0)phi2[ind]=2*TMath::Pi()+phi2[ind];
- ind++;
+
+ /* Test the ffect of mutiple scatternig on error. Negligible
+ // Multiple scattering
+ Float_t beta=1.,pmed=0.875; //pmed=875 MeV (for tracks with dphi<0.01 rad)
+ Float_t beta2=beta*beta;
+ Float_t p2=pmed*pmed;
+ Float_t rBP=3; //Beam Pipe radius = 3cm
+ Float_t dBP=0.08/35.3; // 800 um of Be
+ Float_t dL1=0.01; //approx. 1% of radiation length
+ Float_t theta2BP=14.1*14.1/(beta2*p2*1e6)*TMath::Abs(dBP);
+ Float_t theta2L1=14.1*14.1/(beta2*p2*1e6)*TMath::Abs(dL1);
+*/
+ Int_t nEntriesMod[kNSPDMod];
+ TClonesArray* recpArr[kNSPDMod];
+ for(Int_t modul=0; modul<kNSPDMod; ++modul) {
+ if(!fUseModule[modul]) {
+ nEntriesMod[modul]=0;
+ recpArr[modul]=0;
+ } else {
+ recpArr[modul]=rpcont->UncheckedGetClusters(modul);
+ nEntriesMod[modul]=recpArr[modul]->GetEntriesFast();
}
- detTypeRec.ResetRecPoints();
}
-
- Int_t nolines=0;
- for(Int_t i=0;i<nrpL1;i++){ // loop on L1 RP
- Float_t r1=TMath::Sqrt(xc1[i]*xc1[i]+yc1[i]*yc1[i]); // radius L1 RP
- for(Int_t j=0;j<nrpL2;j++){ // loop on L2 RP
- Float_t diff = TMath::Abs(phi2[j]-phi1[i]); // diff in azimuth
- if(diff>TMath::Pi())diff=2.*TMath::Pi()-diff; //diff<pi
- if(diff<fDiffPhiMax){ // cut on 10 milliradians by def.
- Float_t r2=TMath::Sqrt(xc2[j]*xc2[j]+yc2[j]*yc2[j]); // radius L2 RP
- Float_t zr0=(r2*zc1[i]-r1*zc2[j])/(r2-r1); //Z @ null radius
- fZCombf->Fill(zr0);
- fZCombc->Fill(zr0);
- fZCombv->Fill(zr0);
- Double_t pA[3];
- Double_t pB[3];
- pA[0]=xc1[i];
- pA[1]=yc1[i];
- pA[2]=zc1[i];
- pB[0]=xc2[j];
- pB[1]=yc2[j];
- pB[2]=zc2[j];
- MakeTracklet(pA,pB,nolines);
+
+ 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
+ if(!fUseModule[modul1]) continue;
+ UShort_t ladder=int(modul1/4)+1; // ladders are numbered starting from 1
+ TClonesArray *prpl1=recpArr[modul1]; //rpcont->UncheckedGetClusters(modul1);
+ Int_t nrecp1 = nEntriesMod[modul1]; //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 ladl2=0 ; ladl2<fLadOnLay2*2+1;ladl2++){
+ for(Int_t k=0;k<4;k++){
+ Int_t ladmod=fLadders[ladder-1]+ladl2;
+ if(ladmod>AliITSgeomTGeo::GetNLadders(2)) ladmod=ladmod-AliITSgeomTGeo::GetNLadders(2);
+ Int_t modul2=AliITSgeomTGeo::GetModuleIndex(2,ladmod,k+1);
+ if(modul2<0)continue;
+ if(!fUseModule[modul2]) continue;
+ itsRec=recpArr[modul2]; // rpcont->UncheckedGetClusters(modul2);
+ Int_t nrecp2 = nEntriesMod[modul2]; // 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){
+ 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 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
+ /*
+ // Multiple scattering
+ ezr0q+=r1*r1*(1+tgth*tgth)*theta2L1/2; // multiple scattering in layer 1
+ ezr0q+=rBP*rBP*(1+tgth*tgth)*theta2BP/2; // multiple scattering in beam pipe
+ */
+ if(nopoints<maxdim) new(points[nopoints++])AliITSZPoint(zr0,ezr0q);
+ fZCombc->Fill(zr0);
+ }
+ }
+ }
}
}
}
- delete [] xc1;
- delete [] yc1;
- delete [] zc1;
- delete [] phi1;
- delete [] xc2;
- delete [] yc2;
- delete [] zc2;
- delete [] phi2;
+
+ 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();
- itsLoader->UnloadRecPoints();
- fCurrentVertex = new AliESDVertex(0.,5.3,-1);
+ fCurrentVertex = new AliESDVertex(startPos,startCov,99999.,-1);
+ points.Clear();
return;
}
- /*
- else {
- if(fDebug>0)cout<<"Number of entries in hist. "<<fZCombc->GetEntries()<<endl;
- }
- */
TH1F *hc = fZCombc;
- Bool_t goon = kFALSE;
- Int_t cnt = 0;
- Int_t bi;
- do {
- goon = kFALSE;
- cnt++;
- bi = hc->GetMaximumBin(); // bin with maximal content on coarse histogram
- if(hc->GetBinContent(bi)<3){
- if(cnt==1)goon = kTRUE;
- hc = fZCombv;
- }
- } while(goon);
-
-
- Float_t centre = hc->GetBinCenter(bi); // z value of the bin with maximal content
- // evaluation of the centroid
- Int_t ii1=TMath::Max(bi-3,1);
- Int_t ii2=TMath::Min(bi+3,hc->GetNbinsX());
- centre = 0.;
- Int_t nn=0;
- for(Int_t ii=ii1;ii<ii2;ii++){
- centre+= hc->GetBinCenter(ii)*hc->GetBinContent(ii);
- nn+=static_cast<Int_t>(hc->GetBinContent(ii));
- }
- if (nn) centre/=nn;
- /*
- if(fDebug>0){
- cout<<"Value of center "<<centre<<endl;
- cout<<"Population of 3 central bins: "<<hc->GetBinContent(bi-1)<<", ";
- cout<<hc->GetBinContent(bi)<<", ";
- cout<<hc->GetBinContent(bi+1)<<endl;
- }
- */
- // n1 is the bin number of fine histogram containing the point located 1 coarse bin less than "centre"
- Int_t n1 = static_cast<Int_t>((centre-hc->GetBinWidth(bi)-fZCombf->GetBinLowEdge(0))/fStepFine);
- // n2 is the bin number of fine histogram containing the point located 1 coarse bin more than "centre"
- Int_t n2 = static_cast<Int_t>((centre+hc->GetBinWidth(bi)-fZCombf->GetBinLowEdge(0))/fStepFine);
- if(n1<1)n1=1;
- if(n2>nbinfine)n2=nbinfine;
- Int_t niter = 0;
- goon = kTRUE;
- Int_t num=0;
- Bool_t last = kFALSE;
+ 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;
- while(goon || last){
- fZFound = 0.;
- fZsig = 0.;
- num=0;
- // at the end of the loop:
- // fZFound = N*(Average Z) - where N is the number of tracklets
- // num=N
- // fZsig = N*Q - where Q is the average of Z*Z
- 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 = 5.3; // Default error from the beam sigmoid
- }
- else{
- Float_t radi = fZsig/(num-1)-fZFound*fZFound/num/(num-1);
- // radi = square root of sample variance of Z
- if(radi>0.)fZsig=TMath::Sqrt(radi);
- else fZsig=5.3; // Default error from the beam sigmoid
- // fZfound - Average Z
- fZFound/=num;
+ 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;
}
- if(!last){
- // goon is true if the distance between the found Z and the lower bin differs from the distance between the found Z and
- // the upper bin by more than tolerance (0.002)
- goon = TMath::Abs(TMath::Abs(fZFound-fZCombf->GetBinCenter(n1))-TMath::Abs(fZFound-fZCombf->GetBinCenter(n2)))>fTolerance;
- // a window in the fine grained histogram is centered aroung the found Z. The width is 2 bins of
- // the coarse grained histogram
- if(num>0){
- n1 = static_cast<Int_t>((fZFound-hc->GetBinWidth(bi)-fZCombf->GetBinLowEdge(0))/fStepFine);
- if(n1<1)n1=1;
- n2 = static_cast<Int_t>((fZFound+hc->GetBinWidth(bi)-fZCombf->GetBinLowEdge(0))/fStepFine);
- if(n2>nbinfine)n2=nbinfine;
- /*
- if(fDebug>0){
- cout<<"Search restricted to n1 = "<<n1<<", n2= "<<n2<<endl;
- cout<<"z1= "<<fZCombf->GetBinCenter(n1)<<", n2 = "<<fZCombf->GetBinCenter(n2)<<endl;
- }
- */
- }
- else {
- n1 = static_cast<Int_t>((centre-(niter+2)*hc->GetBinWidth(bi)-fZCombf->GetBinLowEdge(0))/fStepFine);
- n2 = static_cast<Int_t>((centre+(niter+2)*hc->GetBinWidth(bi)-fZCombf->GetBinLowEdge(0))/fStepFine);
- if(n1<1)n1=1;
- if(n2>nbinfine)n2=nbinfine;
- }
- niter++;
- // no more than 10 adjusting iterations
- if(niter>=10){
- goon = kFALSE;
- // Warning("FindVertexForCurrentEvent","The procedure does not converge\n");
- }
- if((fZsig> 0.0001) && !goon && num>5){
- last = kTRUE;
- n1 = static_cast<Int_t>((fZFound-fZsig-fZCombf->GetBinLowEdge(0))/fZCombf->GetBinWidth(0));
- if(n1<1)n1=1;
- n2 = static_cast<Int_t>((fZFound+fZsig-fZCombf->GetBinLowEdge(0))/fZCombf->GetBinWidth(0));
- if(n2>nbinfine)n2=nbinfine;
- /*
- if(fDebug>0){
- cout<<"FINAL Search restricted to n1 = "<<n1<<", n2= "<<n2<<endl;
- cout<<"z1= "<<fZCombf->GetBinCenter(n1)<<", n2 = "<<fZCombf->GetBinCenter(n2)<<endl;
- }
- */
+ zm=0.;
+ ezm=0.;
+ ncontr=0;
+ for(Int_t i =0; i<points.GetEntries(); 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++;
}
}
- else {
- last = kFALSE;
+ 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(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);
}
- // if(fDebug>0)cout<<"Numer of Iterations "<<niter<<endl<<endl;
- // if(num!=0)fZsig/=TMath::Sqrt(num);
- if (fZsig<=0) fZsig=5.3; // Default error from the beam sigmoid
- fCurrentVertex = new AliESDVertex(fZFound,fZsig,num);
- fCurrentVertex->SetTitle("vertexer: B");
+
ResetHistograms();
- itsLoader->UnloadRecPoints();
return;
}
+//_____________________________________________________________________
+Int_t AliITSVertexerZ::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 AliITSVertexerZ::ResetHistograms(){
// delete TH1 data members
if(fZCombc)delete fZCombc;
- if(fZCombf)delete fZCombf;
- if(fZCombv)delete fZCombv;
fZCombc = 0;
- fZCombf = 0;
- fZCombv = 0;
-}
-
-//______________________________________________________________________
-void AliITSVertexerZ::FindVertices(){
- // computes the vertices of the events in the range FirstEvent - LastEvent
- AliRunLoader *rl = AliRunLoader::GetRunLoader();
- AliITSLoader* itsLoader = (AliITSLoader*) rl->GetLoader("ITSLoader");
- itsLoader->ReloadRecPoints();
- for(Int_t i=fFirstEvent;i<=fLastEvent;i++){
- // cout<<"Processing event "<<i<<endl;
- rl->GetEvent(i);
- FindVertexForCurrentEvent(i);
- if(fCurrentVertex){
- WriteCurrentVertex();
- }
- /*
- else {
- if(fDebug>0){
- cout<<"Vertex not found for event "<<i<<endl;
- cout<<"fZFound = "<<fZFound<<", fZsig= "<<fZsig<<endl;
- }
- }
- */
- }
}
//________________________________________________________
cout <<fLastL2<<endl;
cout <<" Max Phi difference: "<<fDiffPhiMax<<endl;
cout <<"Limits for Z histograms: "<<fLowLim<<"; "<<fHighLim<<endl;
- cout <<"Bin sizes for coarse and fine z histos "<<fStepCoarse<<"; "<<fStepFine<<endl;
+ cout <<"Bin sizes for coarse z histos "<<fStepCoarse<<endl;
cout <<" Current Z "<<fZFound<<"; Z sig "<<fZsig<<endl;
- cout <<" Debug flag: "<<fDebug<<endl;
- cout <<"First event to be processed "<<fFirstEvent;
- cout <<"\n Last event to be processed "<<fLastEvent<<endl;
if(fZCombc){
cout<<"fZCombc exists - entries="<<fZCombc->GetEntries()<<endl;
}
else{
cout<<"fZCombc does not exist\n";
}
- if(fZCombv){
- cout<<"fZCombv exists - entries="<<fZCombv->GetEntries()<<endl;
- }
- else{
- cout<<"fZCombv does not exist\n";
- }
- if(fZCombf){
- cout<<"fZCombf exists - entries="<<fZCombv->GetEntries()<<endl;
- }
- else{
- cout<<"fZCombf does not exist\n";
- }
cout <<"=======================================================\n";
}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff