fDCAcut(0),
fAlgo(1),
fNSigma(3),
+fITSin(kTRUE),
+fITSrefit(kTRUE),
fDebug(0)
{
//
fDCAcut(0),
fAlgo(1),
fNSigma(3),
+fITSin(kTRUE),
+fITSrefit(kTRUE),
fDebug(0)
{
//
fCurrentVertex = 0;
delete[] fTrksToSkip;
}
-//---------------------------------------------------------------------------
-void AliVertexerTracks::SetSkipTracks(Int_t n,Int_t *skipped) {
-//
-// Mark the tracks not ot be used in the vertex finding
-//
- fNTrksToSkip = n;
- fTrksToSkip = new Int_t[n];
- for(Int_t i=0;i<n;i++) fTrksToSkip[i] = skipped[i];
- return;
-}
-//----------------------------------------------------------------------------
-Int_t AliVertexerTracks::PrepareTracks(TTree &trkTree, Int_t OptImpParCut) {
-//
-// Propagate tracks to initial vertex position and store them in a TObjArray
-//
- Double_t maxd0rphi = 3.;
- Int_t nTrks = 0;
- Double_t sigmaCurr[3],sigmaVtx[3],posVtx[3];
- Double_t covVtx[6],covVtxXY;
- Float_t d0z0[2],covd0z0[3];
- Double_t momentum[3],postrk[3];
- Double_t pt,sigma,sigmavtxphi,phitrk;
- Double_t field=GetField();
-
- AliESDVertex *initVertex = new AliESDVertex(fNominalPos,fNominalSigma);
-
- Int_t nEntries = (Int_t)trkTree.GetEntries();
- if(!fTrkArray.IsEmpty()) fTrkArray.Delete();
- // fTrkArray.Expand(nEntries);
-
- if(fDebug) {
- printf(" PrepareTracks()\n");
- }
-
- for(Int_t i=0; i<nEntries; i++) {
- AliESDtrack *track = new AliESDtrack;
- trkTree.SetBranchAddress("tracks",&track);
- trkTree.GetEvent(i);
-
-
-
- // propagate track to vertex
- if(OptImpParCut==1) { // OptImpParCut==1
- track->RelateToVertex(initVertex,field,100.);
- initVertex->GetXYZ(posVtx);
- initVertex->GetSigmaXYZ(sigmaVtx);
- covVtxXY = 0.;
- } else { // OptImpParCut==2
- fCurrentVertex->GetSigmaXYZ(sigmaCurr);
- if((sigmaCurr[0]+sigmaCurr[1])<(fNominalSigma[0]+fNominalSigma[1])) {
- track->RelateToVertex(fCurrentVertex,field,100.);
- fCurrentVertex->GetXYZ(posVtx);
- fCurrentVertex->GetSigmaXYZ(sigmaVtx);
- fCurrentVertex->GetCovMatrix(covVtx);
- covVtxXY = covVtx[1];
- } else {
- track->RelateToVertex(initVertex,field,100.);
- initVertex->GetXYZ(posVtx);
- initVertex->GetSigmaXYZ(sigmaVtx);
- covVtxXY = 0.;
- }
- }
-
- // select tracks with d0rphi < maxd0rphi
- track->GetImpactParameters(d0z0,covd0z0);
-
- track->GetXYZ(postrk);
- track->GetPxPyPz(momentum);
- pt = TMath::Sqrt(momentum[0]*momentum[0]+momentum[1]*momentum[1]);
-
- phitrk = TMath::ATan2(postrk[1]-posVtx[1],postrk[0]-posVtx[0]);
- sigmavtxphi = TMath::Sqrt(sigmaVtx[0]*sigmaVtx[0]*
- TMath::Cos(phitrk)*TMath::Cos(phitrk)+
- sigmaVtx[1]*sigmaVtx[1]*
- TMath::Sin(phitrk)*TMath::Sin(phitrk)+
- covVtxXY*
- TMath::Cos(phitrk)*TMath::Sin(phitrk));
- sigma = TMath::Sqrt(Sigmad0rphi(pt)*Sigmad0rphi(pt)+
- sigmavtxphi*sigmavtxphi);
- maxd0rphi = fNSigma*sigma;
- if(OptImpParCut==1) maxd0rphi *= 5.;
-
- if(fDebug) printf("trk %d; lab %d; |d0| = %f; cut = %f\n",i,track->GetLabel(),TMath::Abs(d0z0[0]),maxd0rphi);
- if(TMath::Abs(d0z0[0]) > maxd0rphi) {
- if(fDebug) printf(" rejected\n");
- delete track; continue;
- }
-
- fTrkArray.AddLast(track);
- nTrks++;
- }
-
- delete initVertex;
-
- return nTrks;
-}
-//----------------------------------------------------------------------------
-Double_t AliVertexerTracks::Sigmad0rphi(Double_t pt) const {
-//
-// Impact parameter resolution in rphi [cm] vs pt [GeV/c]
-//
- Double_t a_meas = 11.6;
- Double_t a_scatt = 65.8;
- Double_t b = 1.878;
-
- Double_t sigma = a_meas*a_meas+a_scatt*a_scatt/TMath::Power(pt,b);
- sigma = 0.0001*TMath::Sqrt(sigma);
-
- return sigma;
-}
-//----------------------------------------------------------------------------
-AliVertex* AliVertexerTracks::VertexForSelectedTracks(TTree *trkTree) {
-//
-// Return vertex from tracks in trkTree
-//
-
- // get tracks and propagate them to initial vertex position
- Int_t nTrks = PrepareTracks(*trkTree,1);
- if(nTrks < fMinTracks) {
- printf("TooFewTracks\n");
- Double_t vtx[3]={0,0,0};
- fVert.SetXYZ(vtx);
- fVert.SetDispersion(999);
- fVert.SetNContributors(-5);
- fTrkArray.Delete();
- return &fVert;
- }
-
- // Set initial vertex position from ESD
- if(fAlgo==1) StrLinVertexFinderMinDist(1);
- if(fAlgo==2) StrLinVertexFinderMinDist(0);
- if(fAlgo==3) HelixVertexFinder();
- if(fAlgo==4) VertexFinder(1);
- if(fAlgo==5) VertexFinder(0);
- return &fVert;
-}
//----------------------------------------------------------------------------
AliESDVertex* AliVertexerTracks::FindPrimaryVertex(const AliESD *esdEvent)
{
//
fCurrentVertex = 0;
- Int_t entr = (Int_t)esdEvent->GetNumberOfTracks();
+ Int_t nTrksTot = (Int_t)esdEvent->GetNumberOfTracks();
TTree *trkTree = new TTree("TreeT","tracks");
AliESDtrack *esdTrack = 0;
trkTree->Branch("tracks","AliESDtrack",&esdTrack);
Bool_t skipThis;
- for(Int_t i=0; i<entr; i++) {
+ for(Int_t i=0; i<nTrksTot; i++) {
// check tracks to skip
skipThis = kFALSE;
for(Int_t j=0; j<fNTrksToSkip; j++) {
skipThis = kTRUE;
}
}
- if(skipThis) continue;
AliESDtrack *et = esdEvent->GetTrack(i);
esdTrack = new AliESDtrack(*et);
- if(!(esdTrack->GetStatus()&AliESDtrack::kITSin)) {delete esdTrack;continue;}
- if(!(esdTrack->GetStatus()&AliESDtrack::kITSrefit)) {delete esdTrack;continue;}
- Int_t nclus=esdTrack->GetNcls(0); // check number of clusters in ITS
- if(nclus<fMinITSClusters) {delete esdTrack;continue;}
+ if(skipThis) {delete esdTrack;continue;}
+ if(fITSin) {
+ if(!(esdTrack->GetStatus()&AliESDtrack::kITSin)) {delete esdTrack;continue;}
+ if(fITSrefit && !(esdTrack->GetStatus()&AliESDtrack::kITSrefit)) {delete esdTrack;continue;}
+ Int_t nclus=esdTrack->GetNcls(0); // check number of clusters in ITS
+ if(nclus<fMinITSClusters) {delete esdTrack;continue;}
+ }
trkTree->Fill();
delete esdTrack;
}
- // delete esdTrack;
// ITERATION 1
// propagate tracks to initVertex
// preselect them (reject for |d0|>5*fNSigma*sigma w.r.t. initVertex)
- Int_t nTrks;
- nTrks = PrepareTracks(*trkTree,1);
- if(fDebug) printf(" tracks prepared - step 1: %d\n",nTrks);
- if(nTrks < fMinTracks) {
- printf("TooFewTracks\n");
+ Int_t nTrksPrep;
+ nTrksPrep = PrepareTracks(*trkTree,1);
+ if(fDebug) printf(" tracks prepared - step 1: %d\n",nTrksPrep);
+ if(nTrksPrep < fMinTracks) {
+ if(fDebug) printf("TooFewTracks\n");
TooFewTracks(esdEvent);
if(fDebug) fCurrentVertex->PrintStatus();
fTrkArray.Delete();
// propagate tracks to best between initVertex and fCurrentVertex
// preselect tracks (reject for |d0|>fNSigma*sigma w.r.t. best
// between initVertex and fCurrentVertex)
- nTrks = PrepareTracks(*trkTree,2);
+ nTrksPrep = PrepareTracks(*trkTree,2);
delete trkTree;
- if(fDebug) printf(" tracks prepared - step 2: %d\n",nTrks);
- if(nTrks < fMinTracks) {
- printf("TooFewTracks\n");
+ if(fDebug) printf(" tracks prepared - step 2: %d\n",nTrksPrep);
+ if(nTrksPrep < fMinTracks) {
+ if(fDebug) printf("TooFewTracks\n");
TooFewTracks(esdEvent);
if(fDebug) fCurrentVertex->PrintStatus();
fTrkArray.Delete();
if(fDebug) printf(" vertex fit completed\n");
- fTrkArray.Delete();
-
// take true pos from ESD
Double_t tp[3];
esdEvent->GetVertex()->GetTruePos(tp);
fCurrentVertex->SetTruePos(tp);
- if(fNominalSigma[0]>1.) {
+ if(fNominalCov[0]>1.) {
fCurrentVertex->SetTitle("VertexerTracksNoConstraint");
} else {
fCurrentVertex->SetTitle("VertexerTracksWithConstraint");
}
- if(fDebug) fCurrentVertex->PrintStatus();
- if(fTrksToSkip) delete [] fTrksToSkip;
// propagate tracks to found vertex
if(TMath::Sqrt(fCurrentVertex->GetXv()*fCurrentVertex->GetXv()+fCurrentVertex->GetYv()*fCurrentVertex->GetYv())<3.) {
- for(Int_t ii=0; ii<entr; ii++) {
+ for(Int_t ii=0; ii<nTrksTot; ii++) {
AliESDtrack *et = esdEvent->GetTrack(ii);
- if(!et->GetStatus()&AliESDtrack::kITSin) continue;
+ if(!(et->GetStatus()&AliESDtrack::kITSin)) continue;
if(et->GetX()>3.) continue;
et->RelateToVertex(fCurrentVertex,GetField(),100.);
}
} else {
AliWarning("Found vertex outside beam pipe!");
}
+
+ // set indices of used tracks
+ UShort_t *indices = 0;
+ AliESDtrack *ett = 0;
+ if(fCurrentVertex->GetNContributors()>0) {
+ indices = new UShort_t[fCurrentVertex->GetNContributors()];
+ for(Int_t jj=0;jj<(Int_t)fTrkArray.GetEntriesFast();jj++) {
+ ett = (AliESDtrack*)fTrkArray.At(jj);
+ indices[jj] = (UShort_t)ett->GetID();
+ }
+ fCurrentVertex->SetIndices(fCurrentVertex->GetNContributors(),indices);
+ }
+ delete [] indices;
+ fTrkArray.Delete();
+
+ if(fTrksToSkip) delete [] fTrksToSkip;
+
+
+ if(fDebug) fCurrentVertex->PrintStatus();
+ if(fDebug) fCurrentVertex->PrintIndices();
return fCurrentVertex;
}
-//----------------------------------------------------------------------------
-AliESDVertex* AliVertexerTracks::FindPrimaryVertexOld(const AliESD *esdEvent)
-{
-//
-// Primary vertex for current ESD event (one iteration with |d0rphi|<3cm)
-//
- fCurrentVertex = 0;
-
- Int_t entr = (Int_t)esdEvent->GetNumberOfTracks();
- TTree *trkTree = new TTree("TreeT","tracks");
- AliESDtrack *esdTrack = 0;
- trkTree->Branch("tracks","AliESDtrack",&esdTrack);
-
- for(Int_t i=0; i<entr; i++) {
- AliESDtrack *et = esdEvent->GetTrack(i);
- esdTrack = new AliESDtrack(*et);
- if(!(esdTrack->GetStatus()&AliESDtrack::kITSin)) {delete esdTrack;continue;}
- if(!(esdTrack->GetStatus()&AliESDtrack::kITSrefit)) {delete esdTrack;continue;}
- Int_t nclus=esdTrack->GetNcls(0); // check number of clusters in ITS
- if(nclus<fMinITSClusters) continue;
+//------------------------------------------------------------------------
+Double_t AliVertexerTracks::GetDeterminant3X3(Double_t matr[][3]){
+ //
+ Double_t det=matr[0][0]*matr[1][1]*matr[2][2]-matr[0][0]*matr[1][2]*matr[2][1]-matr[0][1]*matr[1][0]*matr[2][2]+matr[0][1]*matr[1][2]*matr[2][0]+matr[0][2]*matr[1][0]*matr[2][1]-matr[0][2]*matr[1][1]*matr[2][0];
+ return det;
+}
+//-------------------------------------------------------------------------
+void AliVertexerTracks::GetStrLinDerivMatrix(Double_t *p0,Double_t *p1,Double_t (*m)[3],Double_t *d){
- trkTree->Fill();
- delete esdTrack;
- }
- // delete esdTrack;
+ //
+ Double_t x12=p0[0]-p1[0];
+ Double_t y12=p0[1]-p1[1];
+ Double_t z12=p0[2]-p1[2];
+ Double_t kk=x12*x12+y12*y12+z12*z12;
+ m[0][0]=2-2/kk*x12*x12;
+ m[0][1]=-2/kk*x12*y12;
+ m[0][2]=-2/kk*x12*z12;
+ m[1][0]=-2/kk*x12*y12;
+ m[1][1]=2-2/kk*y12*y12;
+ m[1][2]=-2/kk*y12*z12;
+ m[2][0]=-2/kk*x12*z12;
+ m[2][1]=-2*y12*z12;
+ m[2][2]=2-2/kk*z12*z12;
+ d[0]=2*p0[0]-2/kk*p0[0]*x12*x12-2/kk*p0[2]*x12*z12-2/kk*p0[1]*x12*y12;
+ d[1]=2*p0[1]-2/kk*p0[1]*y12*y12-2/kk*p0[0]*x12*y12-2/kk*p0[2]*z12*y12;
+ d[2]=2*p0[2]-2/kk*p0[2]*z12*z12-2/kk*p0[0]*x12*z12-2/kk*p0[1]*z12*y12;
- // preselect tracks and propagate them to initial vertex position
- Int_t nTrks = PrepareTracks(*trkTree,1);
- delete trkTree;
- if(fDebug) printf(" tracks prepared: %d\n",nTrks);
- if(nTrks < fMinTracks) {
- printf("TooFewTracks\n");
- fCurrentVertex = new AliESDVertex(0.,0.,-1);
- fTrkArray.Delete();
- return fCurrentVertex;
- }
+}
+//--------------------------------------------------------------------------
+void AliVertexerTracks::GetStrLinDerivMatrix(Double_t *p0,Double_t *p1,Double_t *sigmasq,Double_t (*m)[3],Double_t *d){
+ //
+ Double_t x12=p1[0]-p0[0];
+ Double_t y12=p1[1]-p0[1];
+ Double_t z12=p1[2]-p0[2];
- // VERTEX FINDER
- switch (fAlgo) {
- case 1: StrLinVertexFinderMinDist(1); break;
- case 2: StrLinVertexFinderMinDist(0); break;
- case 3: HelixVertexFinder(); break;
- case 4: VertexFinder(1); break;
- case 5: VertexFinder(0); break;
- default: printf("Wrong algorithm\n"); break;
- }
+ Double_t den= x12*x12*sigmasq[1]*sigmasq[2]+y12*y12*sigmasq[0]*sigmasq[2]+z12*z12*sigmasq[0]*sigmasq[1];
- // VERTEX FITTER
- VertexFitter();
- if(fDebug) printf(" vertex fit completed\n");
+ Double_t kk= 2*(x12*x12/sigmasq[0]+y12*y12/sigmasq[1]+z12*z12/sigmasq[2]);
+ Double_t cc[3];
+ cc[0]=-x12/sigmasq[0];
+ cc[1]=-y12/sigmasq[1];
+ cc[2]=-z12/sigmasq[2];
- Double_t tp[3];
- esdEvent->GetVertex()->GetTruePos(tp);
- fCurrentVertex->SetTruePos(tp);
- fCurrentVertex->SetTitle("VertexerTracks");
+ Double_t ww=(-p0[0]*x12*sigmasq[1]*sigmasq[2]-p0[1]*y12*sigmasq[0]*sigmasq[2]-p0[2]*z12*sigmasq[0]*sigmasq[1])/den;
- fTrkArray.Delete();
- return fCurrentVertex;
-}
-//----------------------------------------------------------------------------
-AliVertex* AliVertexerTracks::VertexForSelectedTracks(TObjArray *trkArray) {
-//
-// Return vertex from array of tracks
-//
+ Double_t ss= -p0[0]*cc[0]-p0[1]*cc[1]-p0[2]*cc[2];
- // get tracks and propagate them to initial vertex position
- Int_t nTrks = trkArray->GetEntriesFast();
- if(nTrks < fMinTracks) {
- printf("TooFewTracks\n");
- Double_t vtx[3]={0,0,0};
- fVert.SetXYZ(vtx);
- fVert.SetDispersion(999);
- fVert.SetNContributors(-5);
- fTrkArray.Delete();
- return &fVert;
- }
- TTree *trkTree = new TTree("TreeT","tracks");
- AliESDtrack *esdTrack = 0;
- trkTree->Branch("tracks","AliESDtrack",&esdTrack);
- for(Int_t i=0; i<nTrks; i++){
- esdTrack = (AliESDtrack*)trkArray->At(i);
- trkTree->Fill();
- }
-
- AliVertex *vtx = VertexForSelectedTracks(trkTree);
- delete trkTree;
- return vtx;
-}
+ Double_t aa[3];
+ aa[0]=x12*sigmasq[1]*sigmasq[2]/den;
+ aa[1]=y12*sigmasq[0]*sigmasq[2]/den;
+ aa[2]=z12*sigmasq[0]*sigmasq[1]/den;
-//---------------------------------------------------------------------------
-void AliVertexerTracks::VertexFinder(Int_t optUseWeights) {
+ m[0][0]=aa[0]*(aa[0]*kk+2*cc[0])+2*cc[0]*aa[0]+2/sigmasq[0];
+ m[0][1]=aa[1]*(aa[0]*kk+2*cc[0])+2*cc[1]*aa[0];
+ m[0][2]=aa[2]*(aa[0]*kk+2*cc[0])+2*cc[2]*aa[0];
- // Get estimate of vertex position in (x,y) from tracks DCA
-
- Double_t initPos[3];
- initPos[2] = 0.;
- for(Int_t i=0;i<2;i++)initPos[i]=fNominalPos[i];
- Int_t nacc = (Int_t)fTrkArray.GetEntriesFast();
- Double_t aver[3]={0.,0.,0.};
- Double_t aversq[3]={0.,0.,0.};
- Double_t sigmasq[3]={0.,0.,0.};
- Double_t sigma=0;
- Int_t ncombi = 0;
- AliESDtrack *track1;
- AliESDtrack *track2;
- Double_t pos[3],dir[3];
- Double_t alpha,mindist;
- Double_t field=GetField();
+ m[1][0]=aa[0]*(aa[1]*kk+2*cc[1])+2*cc[0]*aa[1];
+ m[1][1]=aa[1]*(aa[1]*kk+2*cc[1])+2*cc[1]*aa[1]+2/sigmasq[1];
+ m[1][2]=aa[2]*(aa[1]*kk+2*cc[1])+2*cc[2]*aa[1];
- for(Int_t i=0; i<nacc; i++){
- track1 = (AliESDtrack*)fTrkArray.At(i);
- alpha=track1->GetAlpha();
- mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1];
- track1->GetXYZAt(mindist,field,pos);
- track1->GetPxPyPzAt(mindist,field,dir);
- AliStrLine *line1 = new AliStrLine(pos,dir);
+ m[2][0]=aa[0]*(aa[2]*kk+2*cc[2])+2*cc[0]*aa[2];
+ m[2][1]=aa[1]*(aa[2]*kk+2*cc[2])+2*cc[1]*aa[2];
+ m[2][2]=aa[2]*(aa[2]*kk+2*cc[2])+2*cc[2]*aa[2]+2/sigmasq[2];
- // AliStrLine *line1 = new AliStrLine();
- // track1->ApproximateHelixWithLine(mindist,field,line1);
-
- for(Int_t j=i+1; j<nacc; j++){
- track2 = (AliESDtrack*)fTrkArray.At(j);
- alpha=track2->GetAlpha();
- mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1];
- track2->GetXYZAt(mindist,field,pos);
- track2->GetPxPyPzAt(mindist,field,dir);
- AliStrLine *line2 = new AliStrLine(pos,dir);
- // AliStrLine *line2 = new AliStrLine();
- // track2->ApproximateHelixWithLine(mindist,field,line2);
- Double_t distCA=line2->GetDCA(line1);
- if(fDCAcut<=0 || (fDCAcut>0&&distCA<fDCAcut)){
- Double_t pnt1[3],pnt2[3],crosspoint[3];
+ d[0]=-ww*(aa[0]*kk+2*cc[0])-2*ss*aa[0]+2*p0[0]/sigmasq[0];
+ d[1]=-ww*(aa[1]*kk+2*cc[1])-2*ss*aa[1]+2*p0[1]/sigmasq[1];
+ d[2]=-ww*(aa[2]*kk+2*cc[2])-2*ss*aa[2]+2*p0[2]/sigmasq[2];
- if(optUseWeights<=0){
- Int_t retcode = line2->Cross(line1,crosspoint);
- if(retcode>=0){
- ncombi++;
- for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj];
- for(Int_t jj=0;jj<3;jj++)aversq[jj]+=(crosspoint[jj]*crosspoint[jj]);
- }
- }
- if(optUseWeights>0){
- Int_t retcode = line1->CrossPoints(line2,pnt1,pnt2);
- if(retcode>=0){
- Double_t alpha, cs, sn;
- alpha=track1->GetAlpha();
- cs=TMath::Cos(alpha); sn=TMath::Sin(alpha);
- Double_t sx1=sn*sn*track1->GetSigmaY2(), sy1=cs*cs*track1->GetSigmaY2();
- alpha=track2->GetAlpha();
- cs=TMath::Cos(alpha); sn=TMath::Sin(alpha);
- Double_t sx2=sn*sn*track2->GetSigmaY2(), sy2=cs*cs*track2->GetSigmaY2();
- Double_t sz1=track1->GetSigmaZ2(), sz2=track2->GetSigmaZ2();
- Double_t wx1=sx2/(sx1+sx2), wx2=1.- wx1;
- Double_t wy1=sy2/(sy1+sy2), wy2=1.- wy1;
- Double_t wz1=sz2/(sz1+sz2), wz2=1.- wz1;
- crosspoint[0]=wx1*pnt1[0] + wx2*pnt2[0];
- crosspoint[1]=wy1*pnt1[1] + wy2*pnt2[1];
- crosspoint[2]=wz1*pnt1[2] + wz2*pnt2[2];
-
- ncombi++;
- for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj];
- for(Int_t jj=0;jj<3;jj++)aversq[jj]+=(crosspoint[jj]*crosspoint[jj]);
- }
- }
- }
- delete line2;
- }
- delete line1;
- }
- if(ncombi>0){
- for(Int_t jj=0;jj<3;jj++){
- initPos[jj] = aver[jj]/ncombi;
- aversq[jj]/=ncombi;
- sigmasq[jj]=aversq[jj]-initPos[jj]*initPos[jj];
- sigma+=sigmasq[jj];
- }
- sigma=TMath::Sqrt(TMath::Abs(sigma));
}
- else {
- Warning("VertexFinder","Finder did not succed");
- sigma=999;
- }
- fVert.SetXYZ(initPos);
- fVert.SetDispersion(sigma);
- fVert.SetNContributors(ncombi);
+//--------------------------------------------------------------------------
+Double_t AliVertexerTracks::GetStrLinMinDist(Double_t *p0,Double_t *p1,Double_t *x0){
+ //
+ Double_t x12=p0[0]-p1[0];
+ Double_t y12=p0[1]-p1[1];
+ Double_t z12=p0[2]-p1[2];
+ Double_t x10=p0[0]-x0[0];
+ Double_t y10=p0[1]-x0[1];
+ Double_t z10=p0[2]-x0[2];
+ return ((x10*x10+y10*y10+z10*z10)*(x12*x12+y12*y12+z12*z12)-(x10*x12+y10*y12+z10*z12)*(x10*x12+y10*y12+z10*z12))/(x12*x12+y12*y12+z12*z12);
}
//---------------------------------------------------------------------------
void AliVertexerTracks::HelixVertexFinder() {
fVert.SetDispersion(sigma);
fVert.SetNContributors(ncombi);
}
+//----------------------------------------------------------------------------
+Int_t AliVertexerTracks::PrepareTracks(TTree &trkTree,Int_t OptImpParCut) {
+//
+// Propagate tracks to initial vertex position and store them in a TObjArray
+//
+ Double_t maxd0rphi = 3.;
+ Int_t nTrks = 0;
+ Double_t sigmaCurr[3];
+ Float_t d0z0[2],covd0z0[3];
+ Double_t sigma;
+ Double_t field=GetField();
+
+ AliESDVertex *initVertex = new AliESDVertex(fNominalPos,fNominalCov,1,1);
+
+ Int_t nEntries = (Int_t)trkTree.GetEntries();
+ if(!fTrkArray.IsEmpty()) fTrkArray.Delete();
+
+ if(fDebug) {
+ printf(" PrepareTracks()\n");
+ }
+
+ for(Int_t i=0; i<nEntries; i++) {
+ AliESDtrack *track = new AliESDtrack;
+ trkTree.SetBranchAddress("tracks",&track);
+ trkTree.GetEvent(i);
+
+ // propagate track to vertex
+ if(OptImpParCut==1) { // OptImpParCut==1
+ track->RelateToVertex(initVertex,field,100.);
+ } else { // OptImpParCut==2
+ fCurrentVertex->GetSigmaXYZ(sigmaCurr);
+ if((sigmaCurr[0]+sigmaCurr[1])<(TMath::Sqrt(fNominalCov[0])+TMath::Sqrt(fNominalCov[2]))) {
+ track->RelateToVertex(fCurrentVertex,field,100.);
+ } else {
+ track->RelateToVertex(initVertex,field,100.);
+ }
+ }
+
+ // select tracks with d0rphi < maxd0rphi
+ track->GetImpactParameters(d0z0,covd0z0);
+ sigma = TMath::Sqrt(covd0z0[0]);
+ maxd0rphi = fNSigma*sigma;
+ if(OptImpParCut==1) maxd0rphi *= 5.;
+
+ if(fDebug) printf("trk %d; lab %d; |d0| = %f; cut = %f\n",i,track->GetLabel(),TMath::Abs(d0z0[0]),maxd0rphi);
+ if(TMath::Abs(d0z0[0]) > maxd0rphi) {
+ if(fDebug) printf(" rejected\n");
+ delete track; continue;
+ }
+
+ fTrkArray.AddLast(track);
+ nTrks++;
+ }
+
+ delete initVertex;
+
+ return nTrks;
+}
+//---------------------------------------------------------------------------
+void AliVertexerTracks::SetSkipTracks(Int_t n,Int_t *skipped) {
+//
+// Mark the tracks not ot be used in the vertex finding
+//
+ fNTrksToSkip = n;
+ fTrksToSkip = new Int_t[n];
+ for(Int_t i=0;i<n;i++) fTrksToSkip[i] = skipped[i];
+ return;
+}
+//---------------------------------------------------------------------------
+void AliVertexerTracks::SetVtxStart(AliESDVertex *vtx) {
+//
+// Set initial vertex knowledge
+//
+ vtx->GetXYZ(fNominalPos);
+ vtx->GetCovMatrix(fNominalCov);
+ return;
+}
//---------------------------------------------------------------------------
void AliVertexerTracks::StrLinVertexFinderMinDist(Int_t optUseWeights){
}
- for(Int_t i=0; i<knacc; i++){
- Double_t p0[3]={0,0,0},p1[3]={0,0,0};
- for(Int_t ii=0;ii<3;ii++){
- p0[ii]=vectP0[i][ii];
- p1[ii]=vectP1[i][ii];
- }
- sigma+=GetStrLinMinDist(p0,p1,initPos);
- }
-
- sigma=TMath::Sqrt(sigma);
- }else{
- Warning("StrLinVertexFinderMinDist","Finder did not succed");
- sigma=999;
- }
- delete vectP0;
- delete vectP1;
- fVert.SetXYZ(initPos);
- fVert.SetDispersion(sigma);
- fVert.SetNContributors(knacc);
-}
-//_______________________________________________________________________
-Double_t AliVertexerTracks::GetDeterminant3X3(Double_t matr[][3]){
- //
- Double_t det=matr[0][0]*matr[1][1]*matr[2][2]-matr[0][0]*matr[1][2]*matr[2][1]-matr[0][1]*matr[1][0]*matr[2][2]+matr[0][1]*matr[1][2]*matr[2][0]+matr[0][2]*matr[1][0]*matr[2][1]-matr[0][2]*matr[1][1]*matr[2][0];
- return det;
-}
-//____________________________________________________________________________
-void AliVertexerTracks::GetStrLinDerivMatrix(Double_t *p0,Double_t *p1,Double_t (*m)[3],Double_t *d){
-
- //
- Double_t x12=p0[0]-p1[0];
- Double_t y12=p0[1]-p1[1];
- Double_t z12=p0[2]-p1[2];
- Double_t kk=x12*x12+y12*y12+z12*z12;
- m[0][0]=2-2/kk*x12*x12;
- m[0][1]=-2/kk*x12*y12;
- m[0][2]=-2/kk*x12*z12;
- m[1][0]=-2/kk*x12*y12;
- m[1][1]=2-2/kk*y12*y12;
- m[1][2]=-2/kk*y12*z12;
- m[2][0]=-2/kk*x12*z12;
- m[2][1]=-2*y12*z12;
- m[2][2]=2-2/kk*z12*z12;
- d[0]=2*p0[0]-2/kk*p0[0]*x12*x12-2/kk*p0[2]*x12*z12-2/kk*p0[1]*x12*y12;
- d[1]=2*p0[1]-2/kk*p0[1]*y12*y12-2/kk*p0[0]*x12*y12-2/kk*p0[2]*z12*y12;
- d[2]=2*p0[2]-2/kk*p0[2]*z12*z12-2/kk*p0[0]*x12*z12-2/kk*p0[1]*z12*y12;
-
-}
-//____________________________________________________________________________
-void AliVertexerTracks::GetStrLinDerivMatrix(Double_t *p0,Double_t *p1,Double_t *sigmasq,Double_t (*m)[3],Double_t *d){
- //
- Double_t x12=p1[0]-p0[0];
- Double_t y12=p1[1]-p0[1];
- Double_t z12=p1[2]-p0[2];
-
- Double_t den= x12*x12*sigmasq[1]*sigmasq[2]+y12*y12*sigmasq[0]*sigmasq[2]+z12*z12*sigmasq[0]*sigmasq[1];
-
- Double_t kk= 2*(x12*x12/sigmasq[0]+y12*y12/sigmasq[1]+z12*z12/sigmasq[2]);
-
- Double_t cc[3];
- cc[0]=-x12/sigmasq[0];
- cc[1]=-y12/sigmasq[1];
- cc[2]=-z12/sigmasq[2];
+ for(Int_t i=0; i<knacc; i++){
+ Double_t p0[3]={0,0,0},p1[3]={0,0,0};
+ for(Int_t ii=0;ii<3;ii++){
+ p0[ii]=vectP0[i][ii];
+ p1[ii]=vectP1[i][ii];
+ }
+ sigma+=GetStrLinMinDist(p0,p1,initPos);
+ }
- Double_t ww=(-p0[0]*x12*sigmasq[1]*sigmasq[2]-p0[1]*y12*sigmasq[0]*sigmasq[2]-p0[2]*z12*sigmasq[0]*sigmasq[1])/den;
+ sigma=TMath::Sqrt(sigma);
+ }else{
+ Warning("StrLinVertexFinderMinDist","Finder did not succed");
+ sigma=999;
+ }
+ delete vectP0;
+ delete vectP1;
+ fVert.SetXYZ(initPos);
+ fVert.SetDispersion(sigma);
+ fVert.SetNContributors(knacc);
+}
+//---------------------------------------------------------------------------
+void AliVertexerTracks::TooFewTracks(const AliESD* esdEvent) {
+//
+// When the number of tracks is < fMinTracks
+//
- Double_t ss= -p0[0]*cc[0]-p0[1]*cc[1]-p0[2]*cc[2];
+ // deal with vertices not found
+ Double_t pos[3],err[3];
+ Int_t ncontr=0;
+ pos[0] = fNominalPos[0];
+ err[0] = TMath::Sqrt(fNominalCov[0]);
+ pos[1] = fNominalPos[1];
+ err[1] = TMath::Sqrt(fNominalCov[2]);
+ pos[2] = esdEvent->GetVertex()->GetZv();
+ err[2] = esdEvent->GetVertex()->GetZRes();
+ if(err[0]>1. && esdEvent->GetVertex()->GetNContributors()<=0)
+ ncontr = -1; // (x,y,z) = (0,0,0)
+ if(err[0]>1. && esdEvent->GetVertex()->GetNContributors()>0)
+ ncontr = -2; // (x,y,z) = (0,0,z_fromSPD)
+ if(err[0]<1. && esdEvent->GetVertex()->GetNContributors()<=0)
+ ncontr = -3; // (x,y,z) = (x_mean,y_mean,0)
+ if(err[0]<1. && esdEvent->GetVertex()->GetNContributors()>0)
+ ncontr = -4; // (x,y,z) = (x_mean,y_mean,z_fromSPD)
+ fCurrentVertex = 0;
+ fCurrentVertex = new AliESDVertex(pos,err);
+ fCurrentVertex->SetNContributors(ncontr);
- Double_t aa[3];
- aa[0]=x12*sigmasq[1]*sigmasq[2]/den;
- aa[1]=y12*sigmasq[0]*sigmasq[2]/den;
- aa[2]=z12*sigmasq[0]*sigmasq[1]/den;
+ Double_t tp[3];
+ esdEvent->GetVertex()->GetTruePos(tp);
+ fCurrentVertex->SetTruePos(tp);
+ fCurrentVertex->SetTitle("VertexerTracksWithConstraint");
+ if(ncontr==-1||ncontr==-2)
+ fCurrentVertex->SetTitle("VertexerTracksNoConstraint");
- m[0][0]=aa[0]*(aa[0]*kk+2*cc[0])+2*cc[0]*aa[0]+2/sigmasq[0];
- m[0][1]=aa[1]*(aa[0]*kk+2*cc[0])+2*cc[1]*aa[0];
- m[0][2]=aa[2]*(aa[0]*kk+2*cc[0])+2*cc[2]*aa[0];
+ return;
+}
+//---------------------------------------------------------------------------
+void AliVertexerTracks::VertexFinder(Int_t optUseWeights) {
- m[1][0]=aa[0]*(aa[1]*kk+2*cc[1])+2*cc[0]*aa[1];
- m[1][1]=aa[1]*(aa[1]*kk+2*cc[1])+2*cc[1]*aa[1]+2/sigmasq[1];
- m[1][2]=aa[2]*(aa[1]*kk+2*cc[1])+2*cc[2]*aa[1];
+ // Get estimate of vertex position in (x,y) from tracks DCA
+
+ Double_t initPos[3];
+ initPos[2] = 0.;
+ for(Int_t i=0;i<2;i++)initPos[i]=fNominalPos[i];
+ Int_t nacc = (Int_t)fTrkArray.GetEntriesFast();
+ Double_t aver[3]={0.,0.,0.};
+ Double_t aversq[3]={0.,0.,0.};
+ Double_t sigmasq[3]={0.,0.,0.};
+ Double_t sigma=0;
+ Int_t ncombi = 0;
+ AliESDtrack *track1;
+ AliESDtrack *track2;
+ Double_t pos[3],dir[3];
+ Double_t alpha,mindist;
+ Double_t field=GetField();
- m[2][0]=aa[0]*(aa[2]*kk+2*cc[2])+2*cc[0]*aa[2];
- m[2][1]=aa[1]*(aa[2]*kk+2*cc[2])+2*cc[1]*aa[2];
- m[2][2]=aa[2]*(aa[2]*kk+2*cc[2])+2*cc[2]*aa[2]+2/sigmasq[2];
+ for(Int_t i=0; i<nacc; i++){
+ track1 = (AliESDtrack*)fTrkArray.At(i);
+ alpha=track1->GetAlpha();
+ mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1];
+ track1->GetXYZAt(mindist,field,pos);
+ track1->GetPxPyPzAt(mindist,field,dir);
+ AliStrLine *line1 = new AliStrLine(pos,dir);
- d[0]=-ww*(aa[0]*kk+2*cc[0])-2*ss*aa[0]+2*p0[0]/sigmasq[0];
- d[1]=-ww*(aa[1]*kk+2*cc[1])-2*ss*aa[1]+2*p0[1]/sigmasq[1];
- d[2]=-ww*(aa[2]*kk+2*cc[2])-2*ss*aa[2]+2*p0[2]/sigmasq[2];
+ // AliStrLine *line1 = new AliStrLine();
+ // track1->ApproximateHelixWithLine(mindist,field,line1);
+
+ for(Int_t j=i+1; j<nacc; j++){
+ track2 = (AliESDtrack*)fTrkArray.At(j);
+ alpha=track2->GetAlpha();
+ mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1];
+ track2->GetXYZAt(mindist,field,pos);
+ track2->GetPxPyPzAt(mindist,field,dir);
+ AliStrLine *line2 = new AliStrLine(pos,dir);
+ // AliStrLine *line2 = new AliStrLine();
+ // track2->ApproximateHelixWithLine(mindist,field,line2);
+ Double_t distCA=line2->GetDCA(line1);
+ if(fDCAcut<=0 || (fDCAcut>0&&distCA<fDCAcut)){
+ Double_t pnt1[3],pnt2[3],crosspoint[3];
+ if(optUseWeights<=0){
+ Int_t retcode = line2->Cross(line1,crosspoint);
+ if(retcode>=0){
+ ncombi++;
+ for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj];
+ for(Int_t jj=0;jj<3;jj++)aversq[jj]+=(crosspoint[jj]*crosspoint[jj]);
+ }
+ }
+ if(optUseWeights>0){
+ Int_t retcode = line1->CrossPoints(line2,pnt1,pnt2);
+ if(retcode>=0){
+ Double_t alpha, cs, sn;
+ alpha=track1->GetAlpha();
+ cs=TMath::Cos(alpha); sn=TMath::Sin(alpha);
+ Double_t sx1=sn*sn*track1->GetSigmaY2(), sy1=cs*cs*track1->GetSigmaY2();
+ alpha=track2->GetAlpha();
+ cs=TMath::Cos(alpha); sn=TMath::Sin(alpha);
+ Double_t sx2=sn*sn*track2->GetSigmaY2(), sy2=cs*cs*track2->GetSigmaY2();
+ Double_t sz1=track1->GetSigmaZ2(), sz2=track2->GetSigmaZ2();
+ Double_t wx1=sx2/(sx1+sx2), wx2=1.- wx1;
+ Double_t wy1=sy2/(sy1+sy2), wy2=1.- wy1;
+ Double_t wz1=sz2/(sz1+sz2), wz2=1.- wz1;
+ crosspoint[0]=wx1*pnt1[0] + wx2*pnt2[0];
+ crosspoint[1]=wy1*pnt1[1] + wy2*pnt2[1];
+ crosspoint[2]=wz1*pnt1[2] + wz2*pnt2[2];
+
+ ncombi++;
+ for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj];
+ for(Int_t jj=0;jj<3;jj++)aversq[jj]+=(crosspoint[jj]*crosspoint[jj]);
+ }
+ }
+ }
+ delete line2;
+ }
+ delete line1;
}
-//_____________________________________________________________________________
-Double_t AliVertexerTracks::GetStrLinMinDist(Double_t *p0,Double_t *p1,Double_t *x0){
- //
- Double_t x12=p0[0]-p1[0];
- Double_t y12=p0[1]-p1[1];
- Double_t z12=p0[2]-p1[2];
- Double_t x10=p0[0]-x0[0];
- Double_t y10=p0[1]-x0[1];
- Double_t z10=p0[2]-x0[2];
- return ((x10*x10+y10*y10+z10*z10)*(x12*x12+y12*y12+z12*z12)-(x10*x12+y10*y12+z10*z12)*(x10*x12+y10*y12+z10*z12))/(x12*x12+y12*y12+z12*z12);
+ if(ncombi>0){
+ for(Int_t jj=0;jj<3;jj++){
+ initPos[jj] = aver[jj]/ncombi;
+ aversq[jj]/=ncombi;
+ sigmasq[jj]=aversq[jj]-initPos[jj]*initPos[jj];
+ sigma+=sigmasq[jj];
+ }
+ sigma=TMath::Sqrt(TMath::Abs(sigma));
+ }
+ else {
+ Warning("VertexFinder","Finder did not succed");
+ sigma=999;
+ }
+ fVert.SetXYZ(initPos);
+ fVert.SetDispersion(sigma);
+ fVert.SetNContributors(ncombi);
}
//---------------------------------------------------------------------------
void AliVertexerTracks::VertexFitter(Bool_t useNominalVtx) {
printf(" Number of tracks in array: %d\n",(Int_t)fTrkArray.GetEntriesFast());
printf(" Minimum # tracks required in fit: %d\n",fMinTracks);
printf("Vertex position after finder: %f,%f,%f\n",initPos[0],initPos[1],initPos[2]);
- if(useNominalVtx) printf(" This vertex will be used in fit: (%f+-%f,%f+-%f)\n",fNominalPos[0],fNominalSigma[0],fNominalPos[1],fNominalSigma[1]);
+ if(useNominalVtx) printf(" This vertex will be used in fit: (%f+-%f,%f+-%f)\n",fNominalPos[0],TMath::Sqrt(fNominalCov[0]),fNominalPos[1],TMath::Sqrt(fNominalCov[2]));
}
Int_t i,j,k,step=0;
AliESDtrack *t = 0;
Int_t failed = 0;
+ // initial vertex covariance matrix
+ TMatrixD vVb(3,3);
+ vVb(0,0) = fNominalCov[0];
+ vVb(0,1) = fNominalCov[1];
+ vVb(0,2) = 0.;
+ vVb(1,0) = fNominalCov[1];
+ vVb(1,1) = fNominalCov[2];
+ vVb(1,2) = 0.;
+ vVb(2,0) = 0.;
+ vVb(2,1) = 0.;
+ vVb(2,2) = fNominalCov[5];
+ TMatrixD vVbInv(TMatrixD::kInverted,vVb);
+ TMatrixD rb(3,1);
+ rb(0,0) = fNominalPos[0];
+ rb(1,0) = fNominalPos[1];
+ rb(2,0) = fNominalPos[2];
+ TMatrixD vVbInvrb(vVbInv,TMatrixD::kMult,rb);
+
+
// 2 steps:
// 1st - estimate of vtx using all tracks
// 2nd - estimate of global chi2
for(j=0; j<3; j++) sumWi(j,i) = 0.;
}
+
if(useNominalVtx) {
- for(i=0; i<3; i++) {
- sumWiri(i,0) += fNominalPos[i]/fNominalSigma[i]/fNominalSigma[i];
- sumWi(i,i) += 1./fNominalSigma[i]/fNominalSigma[i];
+ for(i=0;i<3;i++) {
+ sumWiri(i,0) += vVbInvrb(i,0);
+ for(k=0;k<3;k++) sumWi(i,k) += vVbInv(i,k);
}
}
// delete t;
if(failed) {
- printf("TooFewTracks\n");
+ if(fDebug) printf("TooFewTracks\n");
fCurrentVertex = new AliESDVertex(0.,0.,-1);
return;
}
return;
}
-//---------------------------------------------------------------------------
-void AliVertexerTracks::TooFewTracks(const AliESD* esdEvent) {
+//----------------------------------------------------------------------------
+AliVertex* AliVertexerTracks::VertexForSelectedTracks(TTree *trkTree) {
//
-// When the number of tracks is < fMinTracks
+// Return vertex from tracks in trkTree
//
- // deal with vertices not found
- Double_t pos[3],err[3];
- Int_t ncontr=0;
- pos[0] = fNominalPos[0];
- err[0] = fNominalSigma[0];
- pos[1] = fNominalPos[1];
- err[1] = fNominalSigma[1];
- pos[2] = esdEvent->GetVertex()->GetZv();
- err[2] = esdEvent->GetVertex()->GetZRes();
- if(err[0]>1. && esdEvent->GetVertex()->GetNContributors()<=0)
- ncontr = -1; // (x,y,z) = (0,0,0)
- if(err[0]>1. && esdEvent->GetVertex()->GetNContributors()>0)
- ncontr = -2; // (x,y,z) = (0,0,z_fromSPD)
- if(err[0]<1. && esdEvent->GetVertex()->GetNContributors()<=0)
- ncontr = -3; // (x,y,z) = (x_mean,y_mean,0)
- if(err[0]<1. && esdEvent->GetVertex()->GetNContributors()>0)
- ncontr = -4; // (x,y,z) = (x_mean,y_mean,z_fromSPD)
- fCurrentVertex = 0;
- fCurrentVertex = new AliESDVertex(pos,err);
- fCurrentVertex->SetNContributors(ncontr);
-
- Double_t tp[3];
- esdEvent->GetVertex()->GetTruePos(tp);
- fCurrentVertex->SetTruePos(tp);
- fCurrentVertex->SetTitle("VertexerTracksWithConstraint");
- if(ncontr==-1||ncontr==-2)
- fCurrentVertex->SetTitle("VertexerTracksNoConstraint");
+ // get tracks and propagate them to initial vertex position
+ Int_t nTrksPrep = PrepareTracks(*trkTree,1);
+ if(nTrksPrep < fMinTracks) {
+ if(fDebug) printf("TooFewTracks\n");
+ Double_t vtx[3]={0,0,0};
+ fVert.SetXYZ(vtx);
+ fVert.SetDispersion(999);
+ fVert.SetNContributors(-5);
+ fTrkArray.Delete();
+ return &fVert;
+ }
+
+ // Set initial vertex position from ESD
+ if(fAlgo==1) StrLinVertexFinderMinDist(1);
+ if(fAlgo==2) StrLinVertexFinderMinDist(0);
+ if(fAlgo==3) HelixVertexFinder();
+ if(fAlgo==4) VertexFinder(1);
+ if(fAlgo==5) VertexFinder(0);
- return;
+
+ // set indices of used tracks
+ UShort_t *indices = 0;
+ AliESDtrack *eta = 0;
+ if(fVert.GetNContributors()>0) {
+ indices = new UShort_t[fVert.GetNContributors()];
+ for(Int_t jj=0;jj<(Int_t)fTrkArray.GetEntriesFast();jj++) {
+ eta = (AliESDtrack*)fTrkArray.At(jj);
+ indices[jj] = (UShort_t)eta->GetID();
+ }
+ fVert.SetIndices(fVert.GetNContributors(),indices);
+ }
+ delete [] indices;
+ fTrkArray.Delete();
+
+ return &fVert;
}
+//----------------------------------------------------------------------------
+AliVertex* AliVertexerTracks::VertexForSelectedTracks(TObjArray *trkArray) {
+//
+// Return vertex from array of tracks
+//
+ // get tracks and propagate them to initial vertex position
+ Int_t nTrks = trkArray->GetEntriesFast();
+ if(nTrks < fMinTracks) {
+ if(fDebug) printf("TooFewTracks\n");
+ Double_t vtx[3]={0,0,0};
+ fVert.SetXYZ(vtx);
+ fVert.SetDispersion(999);
+ fVert.SetNContributors(-5);
+ fTrkArray.Delete();
+ return &fVert;
+ }
+ TTree *trkTree = new TTree("TreeT","tracks");
+ AliESDtrack *esdTrack = 0;
+ trkTree->Branch("tracks","AliESDtrack",&esdTrack);
+ for(Int_t i=0; i<nTrks; i++){
+ esdTrack = (AliESDtrack*)trkArray->At(i);
+ trkTree->Fill();
+ }
+
+ AliVertex *vtx = VertexForSelectedTracks(trkTree);
+ delete trkTree;
+ return vtx;
+}
+//--------------------------------------------------------------------------
git://git.uio.no / u / mrichter / AliRoot.git / commitdiff