// It can be used successfully with Pb-Pb collisions
////////////////////////////////////////////////////////////////
+using std::endl;
+using std::cout;
ClassImp(AliITSVertexerZ)
fStepCoarse(0),
fTolerance(0.),
fMaxIter(0),
-fWindowWidth(0) {
+fWindowWidth(0),
+fSearchForPileup(kTRUE)
+{
// Default constructor
SetDiffPhiMax();
SetFirstLayerModules();
fStepCoarse(0),
fTolerance(0.),
fMaxIter(0),
-fWindowWidth(0) {
+fWindowWidth(0),
+fSearchForPileup(kTRUE)
+{
// Standard Constructor
SetDiffPhiMax();
SetFirstLayerModules();
//______________________________________________________________________
void AliITSVertexerZ::VertexZFinder(TTree *itsClusterTree){
// Defines the AliESDVertex for the current event
+ delete fCurrentVertex;
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 lc1[3]; for(Int_t ii=0; ii<3; ii++) lc1[ii]=0.;
- Float_t gc1[3]; for(Int_t ii=0; ii<3; ii++) gc1[ii]=0.;
+ 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.;
+ Float_t gc2[3]={0.,0.,0.}; //; for(Int_t ii=0; ii<3; ii++) gc2[ii]=0.;
AliITSRecPointContainer* rpcont=AliITSRecPointContainer::Instance();
- itsRec=rpcont->FetchClusters(0,itsClusterTree);
+ rpcont->FetchClusters(0,itsClusterTree);
if(!rpcont->IsSPDActive()){
AliWarning("Null pointer for RecPoints branch, vertex not calculated");
ResetHistograms();
- fCurrentVertex = new AliESDVertex(0.,5.3,-2);
+ fCurrentVertex = new AliESDVertex(startPos,startCov,99999.,-2);
return;
}
if(nrpL1 == 0 || nrpL2 == 0){
AliDebug(1,Form("No RecPoints in at least one SPD layer (%d %d)",nrpL1,nrpL2));
ResetHistograms();
- fCurrentVertex = new AliESDVertex(0.,5.3,-2);
+ fCurrentVertex = new AliESDVertex(startPos,startCov,99999.,-2);
return;
}
// Force a coarse bin size of 200 microns if the number of clusters on layer 2
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();
+ }
+ }
+
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=rpcont->UncheckedGetClusters(modul1);
- Int_t nrecp1 = prpl1->GetEntries();
+ TClonesArray *prpl1=recpArr[modul1]; //rpcont->UncheckedGetClusters(modul1);
+ Int_t nrecp1 = nEntriesMod[modul1]; //prpl1->GetEntries();
for(Int_t j1=0;j1<nrecp1;j1++){
- AliITSRecPoint *recp = (AliITSRecPoint*)prpl1->At(j1);
- recp->GetGlobalXYZ(gc1);
+ 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 r1=TMath::Sqrt(gc1[0]*gc1[0]+gc1[1]*gc1[1]);
Float_t phi1 = TMath::ATan2(gc1[1],gc1[0]);
- if(phi1<0)phi1+=2*TMath::Pi();
- Float_t zc1=gc1[2];
- Float_t erz1=recp->GetSigmaZ2();
+ 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=rpcont->UncheckedGetClusters(modul2);
- Int_t nrecp2 = itsRec->GetEntries();
+ itsRec=recpArr[modul2]; // rpcont->UncheckedGetClusters(modul2);
+ Int_t nrecp2 = nEntriesMod[modul2]; // itsRec->GetEntries();
for(Int_t j2=0;j2<nrecp2;j2++){
- recp = (AliITSRecPoint*)itsRec->At(j2);
- recp->GetGlobalXYZ(gc2);
+ AliITSRecPoint *recp2 = (AliITSRecPoint*)itsRec->At(j2);
+ recp2->GetGlobalXYZ(gc2);
gc2[0]-=GetNominalPos()[0];
gc2[1]-=GetNominalPos()[1];
- Float_t r2=TMath::Sqrt(gc2[0]*gc2[0]+gc2[1]*gc2[1]);
Float_t phi2 = TMath::ATan2(gc2[1],gc2[0]);
- if(phi2<0)phi2+=2*TMath::Pi();
- Float_t zc2=gc2[2];
- Float_t erz2=recp->GetSigmaZ2();
+ if(phi2<0)phi2+=TMath::TwoPi();
Float_t diff = TMath::Abs(phi2-phi1);
- if(diff>TMath::Pi())diff=2.*TMath::Pi()-diff;
+ 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
- */
+ 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);
}
if(contents<1.){
// Warning("FindVertexForCurrentEvent","Insufficient number of rec. points\n");
ResetHistograms();
- fCurrentVertex = new AliESDVertex(0.,5.3,-1);
+ fCurrentVertex = new AliESDVertex(startPos,startCov,99999.,-1);
points.Clear();
return;
}
zm=0.;
ezm=0.;
ncontr=0;
- for(Int_t i =0; i<points.GetEntries(); i++){
+ 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();
niter++;
} while(niter<10 && TMath::Abs((zm-lim1)-(lim2-zm))>fTolerance);
if(nPeaks==2) ezm=widthSR;
- fCurrentVertex = new AliESDVertex(zm,ezm,ncontr);
+ 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){
+ if(fSearchForPileup && ncontr>fMinTrackletsForPilup){
Float_t secPeakPos;
Int_t ncontr2=FindSecondPeak(fZCombc,binmin,binmax,secPeakPos);
if(ncontr2>=fMinTrackletsForPilup){
}
//_____________________________________________________________________
-Int_t AliITSVertexerZ::FindSecondPeak(TH1F* h, Int_t binmin,Int_t binmax, Float_t& secPeakPos){
+Int_t AliITSVertexerZ::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.);
}