X-Git-Url: http://git.uio.no/git/?a=blobdiff_plain;f=STEER%2FAliVertexerTracks.cxx;h=1d1dae75e9fe5a759f1d6c5a8d03d4b46ee3c8ff;hb=38bc857e4acbc20c0b7b0fe0ece8267eaee26ba4;hp=338db771bc181499489907fb8a9a96e3d2e6df2c;hpb=7f101aa00eee05fea9fb60467befee8e507c6b36;p=u%2Fmrichter%2FAliRoot.git diff --git a/STEER/AliVertexerTracks.cxx b/STEER/AliVertexerTracks.cxx index 338db771bc1..1d1dae75e9f 100644 --- a/STEER/AliVertexerTracks.cxx +++ b/STEER/AliVertexerTracks.cxx @@ -27,6 +27,7 @@ //---- Root headers -------- #include +#include //---- AliRoot headers ----- #include "AliStrLine.h" #include "AliVertexerTracks.h" @@ -38,153 +39,850 @@ ClassImp(AliVertexerTracks) //---------------------------------------------------------------------------- AliVertexerTracks::AliVertexerTracks(): - TObject(),fVert() +TObject(), +fVert(), +fCurrentVertex(0), +fFieldkG(-999.), +fConstraint(kFALSE), +fOnlyFitter(kFALSE), +fMinTracks(1), +fMinITSClusters(5), +fTrkArray(), +fTrksToSkip(0), +fNTrksToSkip(0), +fDCAcut(0), +fAlgo(1), +fNSigma(3), +fMaxd0z0(0.5), +fITSin(kTRUE), +fITSrefit(kTRUE), +fDebug(0) { // // Default constructor // SetVtxStart(); + SetVtxStartSigma(); SetMinTracks(); - fDCAcut=0; - fAlgo=1; + SetMinITSClusters(); + SetNSigmad0(); + SetMaxd0z0(); } -//----------------------------------------------------------------------------- -AliVertexerTracks::AliVertexerTracks(Double_t xStart, Double_t yStart): - TObject(),fVert() +//---------------------------------------------------------------------------- +AliVertexerTracks::AliVertexerTracks(Double_t fieldkG): +TObject(), +fVert(), +fCurrentVertex(0), +fFieldkG(-999.), +fConstraint(kFALSE), +fOnlyFitter(kFALSE), +fMinTracks(1), +fMinITSClusters(5), +fTrkArray(), +fTrksToSkip(0), +fNTrksToSkip(0), +fDCAcut(0), +fAlgo(1), +fNSigma(3), +fMaxd0z0(0.5), +fITSin(kTRUE), +fITSrefit(kTRUE), +fDebug(0) { // // Standard constructor // - SetVtxStart(xStart,yStart); + SetVtxStart(); + SetVtxStartSigma(); SetMinTracks(); - fDCAcut=0; - fAlgo=1; + SetMinITSClusters(); + SetNSigmad0(); + SetMaxd0z0(); + SetFieldkG(fieldkG); } //----------------------------------------------------------------------------- -AliVertexerTracks::~AliVertexerTracks() { +AliVertexerTracks::~AliVertexerTracks() +{ // Default Destructor - // The objects poited by the following pointers are not owned + // The objects pointed by the following pointer are not owned // by this class and are not deleted + fCurrentVertex = 0; + delete[] fTrksToSkip; +} +//---------------------------------------------------------------------------- +AliESDVertex* AliVertexerTracks::FindPrimaryVertex(const AliESD *esdEvent) +{ +// +// Primary vertex for current ESD event +// (Two iterations: +// 1st with 5*fNSigma*sigma cut w.r.t. to initial vertex +// + cut on sqrt(d0d0+z0z0) if fConstraint=kFALSE +// 2nd with fNSigma*sigma cut w.r.t. to vertex found in 1st iteration) +// All ESD tracks with inside the beam pipe are then propagated to found vertex +// + fCurrentVertex = 0; + + // accept 1-track case only if constraint is available + if(!fConstraint && fMinTracks==1) fMinTracks=2; + + // get Bz from ESD + // SetFieldkG(esdEvent->GetMagneticField()); + + // read tracks from ESD + Int_t nTrksTot = (Int_t)esdEvent->GetNumberOfTracks(); + if (nTrksTot<=0) { + if(fDebug) printf("TooFewTracks\n"); + TooFewTracks(esdEvent); + return fCurrentVertex; + } + + TTree *trkTree = new TTree("TreeT","tracks"); + AliESDtrack *esdTrack = 0; + trkTree->Branch("tracks","AliESDtrack",&esdTrack); + + Bool_t skipThis; + for(Int_t i=0; iGetTrack(i); + esdTrack = new AliESDtrack(*et); + // check tracks to skip + skipThis = kFALSE; + for(Int_t j=0; jGetID()==fTrksToSkip[j]) { + if(fDebug) printf("skipping track: %d\n",i); + skipThis = kTRUE; + } + } + 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(nclusFill(); + delete esdTrack; + } + + // If fConstraint=kFALSE + // run VertexFinder(1) to get rough estimate of initVertex (x,y) + if(!fConstraint) { + // fill fTrkArray, for VertexFinder() + if(!fTrkArray.IsEmpty()) fTrkArray.Delete(); + PrepareTracks(*trkTree,0); + Double_t cutsave = fDCAcut; fDCAcut = 0.1; // 1 mm + VertexFinder(1); // using weights, cutting dca < fDCAcut + fDCAcut = cutsave; + fTrkArray.Delete(); + if(fVert.GetNContributors()>0) { + fVert.GetXYZ(fNominalPos); + fNominalPos[0] = fVert.GetXv(); + fNominalPos[1] = fVert.GetYv(); + fNominalPos[2] = fVert.GetZv(); + if(fDebug) printf("No mean vertex: VertexFinder gives (%f, %f, %f)\n",fNominalPos[0],fNominalPos[1],fNominalPos[2]); + } else { + fNominalPos[0] = 0.; + fNominalPos[1] = 0.; + fNominalPos[2] = 0.; + if(fDebug) printf("No mean vertex and VertexFinder failed\n"); + } + } + + // TWO ITERATIONS: + // + // ITERATION 1 + // propagate tracks to fNominalPos vertex + // preselect them: + // if(constraint) reject for |d0|>5*fNSigma*sigma w.r.t. fNominal... vertex + // else reject for |d0|\oplus|z0| > 5 mm w.r.t. fNominal... vertex + // ITERATION 2 + // propagate tracks to best between initVertex and fCurrentVertex + // preselect tracks (reject for |d0|>fNSigma*sigma w.r.t. best + // between initVertex and fCurrentVertex) + for(Int_t iter=0; iter<2; iter++) { + if(fOnlyFitter && iter==0) continue; + Int_t nTrksPrep = PrepareTracks(*trkTree,iter+1); + if(fDebug) printf(" tracks prepared - iteration %d: %d\n",iter+1,nTrksPrep); + if(nTrksPrep < fMinTracks) { + if(fDebug) printf("TooFewTracks\n"); + TooFewTracks(esdEvent); + if(fDebug) fCurrentVertex->PrintStatus(); + fTrkArray.Delete(); + delete trkTree; + return fCurrentVertex; + } + + // vertex finder + if(!fOnlyFitter) { + if(nTrksPrep==1){ + if(fDebug) printf("Just one track\n"); + OneTrackVertFinder(); + }else{ + 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; + } + } + if(fDebug) printf(" Vertex finding completed\n"); + } + + // vertex fitter + VertexFitter(fConstraint); + if(fDebug) printf(" Vertex fit completed\n"); + if(iter==0) fTrkArray.Delete(); + } // end loop on the two iterations + + + // take true pos from SPD vertex in ESD and write it in tracks' vertex + Double_t tp[3]; + esdEvent->GetVertex()->GetTruePos(tp); + fCurrentVertex->SetTruePos(tp); + + if(fConstraint) { + if(fOnlyFitter) { + fCurrentVertex->SetTitle("VertexerTracksWithConstraintOnlyFitter"); + } else { + fCurrentVertex->SetTitle("VertexerTracksWithConstraint"); + } + } else { + fCurrentVertex->SetTitle("VertexerTracksNoConstraint"); + } + + + // 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; + + delete trkTree; + + fTrkArray.Delete(); + + if(fTrksToSkip) delete [] fTrksToSkip; + + + if(fDebug) fCurrentVertex->PrintStatus(); + if(fDebug) fCurrentVertex->PrintIndices(); + + + return fCurrentVertex; +} +//------------------------------------------------------------------------ +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]; + + 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; + + Double_t ss= -p0[0]*cc[0]-p0[1]*cc[1]-p0[2]*cc[2]; + + 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; + + 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]; + + 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]; + + 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]; + + 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]; + + } +//-------------------------------------------------------------------------- +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::OneTrackVertFinder() +{ + // find vertex for events with 1 track, using DCA to nominal beam axis + if(fDebug) printf("Number of prepared tracks =%d - Call OneTrackVertFinder",fTrkArray.GetEntries()); + AliESDtrack *track1; + track1 = (AliESDtrack*)fTrkArray.At(0); + Double_t field=GetFieldkG(); + Double_t alpha=track1->GetAlpha(); + Double_t mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; + Double_t pos[3],dir[3]; + track1->GetXYZAt(mindist,field,pos); + track1->GetPxPyPzAt(mindist,field,dir); + AliStrLine *line1 = new AliStrLine(pos,dir); + Double_t p1[3]={fNominalPos[0],fNominalPos[1],0.}; + Double_t p2[3]={fNominalPos[0],fNominalPos[1],10.}; + AliStrLine *zeta=new AliStrLine(p1,p2,kTRUE); + Double_t crosspoint[3]={0.,0.,0.}; + Double_t sigma=999.; + Int_t nContrib=-1; + Int_t retcode = zeta->Cross(line1,crosspoint); + if(retcode>=0){ + sigma=line1->GetDistFromPoint(crosspoint); + nContrib=1; + } + delete zeta; + delete line1; + fVert.SetXYZ(crosspoint); + fVert.SetDispersion(sigma); + fVert.SetNContributors(nContrib); +} +//--------------------------------------------------------------------------- +void AliVertexerTracks::HelixVertexFinder() +{ + // 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]; + Double_t field=GetFieldkG(); + + Int_t nacc = (Int_t)fTrkArray.GetEntriesFast(); + + Double_t aver[3]={0.,0.,0.}; + Double_t averquad[3]={0.,0.,0.}; + Double_t sigmaquad[3]={0.,0.,0.}; + Double_t sigma=0; + Int_t ncombi = 0; + AliESDtrack *track1; + AliESDtrack *track2; + Double_t distCA; + Double_t x, par[5]; + Double_t alpha, cs, sn; + Double_t crosspoint[3]; + for(Int_t i=0; iPropagateToDCA(track1,field); + if(fDCAcut<=0 ||(fDCAcut>0&&distCAGetExternalParameters(x,par); + alpha=track1->GetAlpha(); + cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); + Double_t x1=x*cs - par[0]*sn; + Double_t y1=x*sn + par[0]*cs; + Double_t z1=par[1]; + Double_t sx1=sn*sn*track1->GetSigmaY2(), sy1=cs*cs*track1->GetSigmaY2(); + track2->GetExternalParameters(x,par); + alpha=track2->GetAlpha(); + cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); + Double_t x2=x*cs - par[0]*sn; + Double_t y2=x*sn + par[0]*cs; + Double_t z2=par[1]; + 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*x1 + wx2*x2; + crosspoint[1]=wy1*y1 + wy2*y2; + crosspoint[2]=wz1*z1 + wz2*z2; + + ncombi++; + for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj]; + for(Int_t jj=0;jj<3;jj++)averquad[jj]+=(crosspoint[jj]*crosspoint[jj]); + } + } + + } + if(ncombi>0){ + for(Int_t jj=0;jj<3;jj++){ + initPos[jj] = aver[jj]/ncombi; + averquad[jj]/=ncombi; + sigmaquad[jj]=averquad[jj]-initPos[jj]*initPos[jj]; + sigma+=sigmaquad[jj]; + } + sigma=TMath::Sqrt(TMath::Abs(sigma)); + } + else { + Warning("HelixVertexFinder","Finder did not succed"); + sigma=999; + } + fVert.SetXYZ(initPos); + fVert.SetDispersion(sigma); + fVert.SetNContributors(ncombi); } //---------------------------------------------------------------------------- -Int_t AliVertexerTracks::PrepareTracks(TTree &trkTree) { +Int_t AliVertexerTracks::PrepareTracks(TTree &trkTree,Int_t optImpParCut) +{ // // Propagate tracks to initial vertex position and store them in a TObjArray // - Double_t alpha,xlStart; + Double_t maxd0rphi; + Double_t maxd0z0 = fMaxd0z0; // default is 5 mm Int_t nTrks = 0; + Double_t sigmaCurr[3]; + Double_t normdistx,normdisty; + Float_t d0z0[2],covd0z0[3]; + Double_t sigma; + Double_t field=GetFieldkG(); + + AliESDVertex *initVertex = new AliESDVertex(fNominalPos,fNominalCov,1,1); Int_t nEntries = (Int_t)trkTree.GetEntries(); - if(!fTrkArray.IsEmpty()) fTrkArray.Clear(); - fTrkArray.Expand(nEntries); + if(!fTrkArray.IsEmpty()) fTrkArray.Delete(); + + if(fDebug) { + printf(" PrepareTracks()\n"); + } for(Int_t i=0; iGetAlpha(); - xlStart = fNominalPos[0]*TMath::Cos(alpha)+fNominalPos[1]*TMath::Sin(alpha); - track->PropagateTo(xlStart,GetField()); // to vtxSeed + // propagate track to vertex + if(optImpParCut<=1 || fOnlyFitter) { // optImpParCut==1 or 0 + track->RelateToVertex(initVertex,field,100.); + } else { // optImpParCut==2 + fCurrentVertex->GetSigmaXYZ(sigmaCurr); + normdistx = TMath::Abs(fCurrentVertex->GetXv()-fNominalPos[0])/TMath::Sqrt(sigmaCurr[0]*sigmaCurr[0]+fNominalCov[0]); + normdisty = TMath::Abs(fCurrentVertex->GetYv()-fNominalPos[1])/TMath::Sqrt(sigmaCurr[1]*sigmaCurr[1]+fNominalCov[2]); + if(normdistx < 3. && normdisty < 3. && + (sigmaCurr[0]+sigmaCurr[1])<(TMath::Sqrt(fNominalCov[0])+TMath::Sqrt(fNominalCov[2]))) { + track->RelateToVertex(fCurrentVertex,field,100.); + } else { + track->RelateToVertex(initVertex,field,100.); + } + } + + 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; d0 cut = %f; |z0| = %f; |d0|oplus|z0| = %f; d0z0 cut = %f\n",i,track->GetLabel(),TMath::Abs(d0z0[0]),maxd0rphi,TMath::Abs(d0z0[1]),TMath::Sqrt(d0z0[0]*d0z0[0]+d0z0[1]*d0z0[1]),maxd0z0); + + // during iterations 1 and 2, if fConstraint=kFALSE, + // select tracks with d0oplusz0 < maxd0z0 + if(optImpParCut>=1 && !fConstraint && nEntries>=3 && + fVert.GetNContributors()>0) { + if(TMath::Sqrt(d0z0[0]*d0z0[0]+d0z0[1]*d0z0[1]) > maxd0z0) { + if(fDebug) printf(" rejected\n"); + delete track; continue; + } + } + + // select tracks with d0rphi < maxd0rphi + if(optImpParCut>0 && TMath::Abs(d0z0[0]) > maxd0rphi) { + if(fDebug) printf(" rejected\n"); + delete track; continue; + } + fTrkArray.AddLast(track); nTrks++; } + + delete initVertex; + return nTrks; } -//---------------------------------------------------------------------------- -AliVertex* AliVertexerTracks::VertexForSelectedTracks(TTree *trkTree) { +//--------------------------------------------------------------------------- +AliESDVertex* AliVertexerTracks::RemoveTracksFromVertex(AliESDVertex *inVtx, + TTree *trksTree, + Float_t *diamondxy) +{ // -// Return vertex from tracks in trkTree +// Removes tracks in trksTree from fit of inVtx // - // get tracks and propagate them to initial vertex position - Int_t nTrks = PrepareTracks(*trkTree); - if(nTrks < fMinTracks) { - printf("TooFewTracks\n"); - Double_t vtx[3]={0,0,0}; - fVert.SetXYZ(vtx); - fVert.SetDispersion(999); - fVert.SetNContributors(-5); - return &fVert; + if(!strstr(inVtx->GetTitle(),"VertexerTracksWithConstraintOnlyFitter")) + printf("WARNING: result of tracks' removal will be only approximately correct\n"); + + TMatrixD rv(3,1); + rv(0,0) = inVtx->GetXv(); + rv(1,0) = inVtx->GetYv(); + rv(2,0) = inVtx->GetZv(); + TMatrixD vV(3,3); + Double_t cov[6]; + inVtx->GetCovMatrix(cov); + vV(0,0) = cov[0]; + vV(0,1) = cov[1]; vV(1,0) = cov[1]; + vV(1,1) = cov[2]; + vV(0,2) = cov[3]; vV(2,0) = cov[3]; + vV(1,2) = cov[4]; vV(2,1) = cov[4]; + vV(2,2) = cov[5]; + + TMatrixD sumWi(TMatrixD::kInverted,vV); + TMatrixD sumWiri(sumWi,TMatrixD::kMult,rv); + + Int_t nUsedTrks = inVtx->GetNContributors(); + Double_t chi2 = inVtx->GetChi2(); + + AliESDtrack *track = 0; + trksTree->SetBranchAddress("tracks",&track); + Int_t ntrks = trksTree->GetEntries(); + for(Int_t i=0;iGetEvent(i); + if(!inVtx->UsesTrack(track->GetID())) { + printf("track %d was not used in vertex fit\n",track->GetID()); + continue; + } + Double_t alpha = track->GetAlpha(); + Double_t xl = diamondxy[0]*TMath::Cos(alpha)+diamondxy[1]*TMath::Sin(alpha); + track->AliExternalTrackParam::PropagateTo(xl,GetFieldkG()); + // vector of track global coordinates + TMatrixD ri(3,1); + // covariance matrix of ri + TMatrixD wWi(3,3); + + // get space point from track + if(!TrackToPoint(track,ri,wWi)) continue; + + TMatrixD wWiri(wWi,TMatrixD::kMult,ri); + + sumWi -= wWi; + sumWiri -= wWiri; + + // track chi2 + TMatrixD deltar = rv; deltar -= ri; + TMatrixD wWideltar(wWi,TMatrixD::kMult,deltar); + Double_t chi2i = deltar(0,0)*wWideltar(0,0)+ + deltar(1,0)*wWideltar(1,0)+ + deltar(2,0)*wWideltar(2,0); + // remove from total chi2 + chi2 -= chi2i; + + nUsedTrks--; + if(nUsedTrks<2) { + printf("Trying to remove too many tracks!\n"); + return 0x0; + } } - - // 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::FindVertex(const AliESD *event) { + TMatrixD rvnew(3,1); + TMatrixD vVnew(3,3); + + // new inverted of weights matrix + TMatrixD invsumWi(TMatrixD::kInverted,sumWi); + vVnew = invsumWi; + // new position of primary vertex + rvnew.Mult(vVnew,sumWiri); + + Double_t position[3]; + position[0] = rvnew(0,0); + position[1] = rvnew(1,0); + position[2] = rvnew(2,0); + cov[0] = vVnew(0,0); + cov[1] = vVnew(0,1); + cov[2] = vVnew(1,1); + cov[3] = vVnew(0,2); + cov[4] = vVnew(1,2); + cov[5] = vVnew(2,2); + + // store data in the vertex object + AliESDVertex *outVtx = new AliESDVertex(position,cov,chi2,nUsedTrks); + outVtx->SetTitle(inVtx->GetTitle()); + Double_t tp[3]; + inVtx->GetTruePos(tp); + outVtx->SetTruePos(tp); + UShort_t *inindices = inVtx->GetIndices(); + UShort_t *outindices = new UShort_t[outVtx->GetNContributors()]; + Int_t j=0; + Bool_t copyindex; + for(Int_t k=0; kGetNIndices(); k++) { + copyindex=kTRUE; + for(Int_t l=0; lGetEvent(l); + if(inindices[k]==track->GetID()) copyindex=kFALSE; + } + if(copyindex) { + outindices[j] = inindices[k]; j++; + } + } + outVtx->SetIndices(outVtx->GetNContributors(),outindices); + delete [] outindices; + + if(fDebug) { + printf("Vertex before removing tracks:\n"); + inVtx->PrintStatus(); + inVtx->PrintIndices(); + printf("Vertex after removing tracks:\n"); + outVtx->PrintStatus(); + outVtx->PrintIndices(); + } + + return outVtx; +} +//--------------------------------------------------------------------------- +void AliVertexerTracks::SetSkipTracks(Int_t n,Int_t *skipped) +{ +// +// Mark the tracks not to be used in the vertex reconstruction. +// Tracks are identified by AliESDtrack::GetID() +// + fNTrksToSkip = n; fTrksToSkip = new Int_t[n]; + for(Int_t i=0;iGetNumberOfTracks(), nacc=0; - while (nt--) { - AliESDtrack *t=event->GetTrack(nt); - if ((t->GetStatus()&AliESDtrack::kITSrefit)==0) continue; - fTrkArray.AddLast(t); - nacc++; + vtx->GetXYZ(fNominalPos); + vtx->GetCovMatrix(fNominalCov); + SetConstraintOn(); + return; +} +//--------------------------------------------------------------------------- +void AliVertexerTracks::StrLinVertexFinderMinDist(Int_t optUseWeights) +{ + AliESDtrack *track1; + Double_t field=GetFieldkG(); + const Int_t knacc = (Int_t)fTrkArray.GetEntriesFast(); + TClonesArray *linarray = new TClonesArray("AliStrLine",1000); + TClonesArray &lines = *linarray; + for(Int_t i=0; iGetAlpha(); + Double_t mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; + Double_t pos[3],dir[3],sigmasq[3]; + track1->GetXYZAt(mindist,field,pos); + track1->GetPxPyPzAt(mindist,field,dir); + sigmasq[0]=TMath::Sin(alpha)*TMath::Sin(alpha)*track1->GetSigmaY2(); + sigmasq[1]=TMath::Cos(alpha)*TMath::Cos(alpha)*track1->GetSigmaY2(); + sigmasq[2]=track1->GetSigmaZ2(); + new(lines[i]) AliStrLine(pos,sigmasq,dir); } + fVert=TrackletVertexFinder(linarray,optUseWeights); + linarray->Delete(); + delete linarray; +} +//--------------------------------------------------------------------------- +AliVertex AliVertexerTracks::TrackletVertexFinder(TClonesArray *lines, Int_t optUseWeights) +{ + // Calculate the point at minimum distance to prepared tracks + + const Int_t knacc = (Int_t)lines->GetEntriesFast(); + Double_t initPos[3]={0.,0.,0.}; + + Double_t (*vectP0)[3]=new Double_t [knacc][3]; + Double_t (*vectP1)[3]=new Double_t [knacc][3]; + + Double_t sum[3][3]; + Double_t dsum[3]={0,0,0}; + for(Int_t i=0;i<3;i++) + for(Int_t j=0;j<3;j++)sum[i][j]=0; + for(Int_t i=0; iAt(i); + Double_t p0[3],cd[3],sigmasq[3]; + line1->GetP0(p0); + line1->GetCd(cd); + line1->GetSigma2P0(sigmasq); + Double_t p1[3]={p0[0]+cd[0],p0[1]+cd[1],p0[2]+cd[2]}; + vectP0[i][0]=p0[0]; + vectP0[i][1]=p0[1]; + vectP0[i][2]=p0[2]; + vectP1[i][0]=p1[0]; + vectP1[i][1]=p1[1]; + vectP1[i][2]=p1[2]; + + Double_t matr[3][3]; + Double_t dknow[3]; + if(optUseWeights==0)GetStrLinDerivMatrix(p0,p1,matr,dknow); + else GetStrLinDerivMatrix(p0,p1,sigmasq,matr,dknow); + + + for(Int_t iii=0;iii<3;iii++){ + dsum[iii]+=dknow[iii]; + for(Int_t lj=0;lj<3;lj++) sum[iii][lj]+=matr[iii][lj]; + } + } + + Double_t vett[3][3]; + Double_t det=GetDeterminant3X3(sum); + Double_t sigma=0; + + if(det!=0){ + for(Int_t zz=0;zz<3;zz++){ + for(Int_t ww=0;ww<3;ww++){ + for(Int_t kk=0;kk<3;kk++) vett[ww][kk]=sum[ww][kk]; + } + for(Int_t kk=0;kk<3;kk++) vett[kk][zz]=dsum[kk]; + initPos[zz]=GetDeterminant3X3(vett)/det; + } + + + for(Int_t i=0; iGetAlpha(); + if(rotAngle<0.) rotAngle += 2.*TMath::Pi(); + Double_t cosRot = TMath::Cos(rotAngle); + Double_t sinRot = TMath::Sin(rotAngle); - fTrkArray.Clear(); - return &fVert; -} + ri(0,0) = t->GetX()*cosRot-t->GetY()*sinRot; + ri(1,0) = t->GetX()*sinRot+t->GetY()*cosRot; + ri(2,0) = t->GetZ(); + // matrix to go from global (x,y,z) to local (y,z); + TMatrixD qQi(2,3); + qQi(0,0) = -sinRot; + qQi(0,1) = cosRot; + qQi(0,2) = 0.; + qQi(1,0) = 0.; + qQi(1,1) = 0.; + qQi(1,2) = 1.; -//---------------------------------------------------------------------------- -AliVertex* AliVertexerTracks::VertexForSelectedTracks(TObjArray *trkArray) { + // covariance matrix of local (y,z) - inverted + TMatrixD uUi(2,2); + Double_t cc[15]; + t->GetExternalCovariance(cc); + uUi(0,0) = cc[0]; + uUi(0,1) = cc[1]; + uUi(1,0) = cc[1]; + uUi(1,1) = cc[2]; + if(uUi.Determinant() <= 0.) return kFALSE; + TMatrixD uUiInv(TMatrixD::kInverted,uUi); + + // weights matrix: wWi = qQiT * uUiInv * qQi + TMatrixD uUiInvQi(uUiInv,TMatrixD::kMult,qQi); + TMatrixD m(qQi,TMatrixD::kTransposeMult,uUiInvQi); + wWi = m; + + return kTRUE; +} +//--------------------------------------------------------------------------- +void AliVertexerTracks::TooFewTracks(const AliESD* esdEvent) +{ // -// Return vertex from array of tracks +// When the number of tracks is < fMinTracks // - // 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); - return &fVert; - } - TTree *trkTree = new TTree("TreeT","tracks"); - AliESDtrack *esdTrack = 0; - trkTree->Branch("tracks","AliESDtrack",&esdTrack); - for(Int_t i=0; iAt(i); - trkTree->Fill(); + // 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 tp[3]; + esdEvent->GetVertex()->GetTruePos(tp); + fCurrentVertex->SetTruePos(tp); + if(fConstraint) { + fCurrentVertex->SetTitle("VertexerTracksWithConstraint"); + } else { + fCurrentVertex->SetTitle("VertexerTracksNoConstraint"); } - - AliVertex *vtx = VertexForSelectedTracks(trkTree); - delete trkTree; - return vtx; -} + return; +} //--------------------------------------------------------------------------- -void AliVertexerTracks::VertexFinder(Int_t optUseWeights) { +void AliVertexerTracks::VertexFinder(Int_t optUseWeights) +{ // Get estimate of vertex position in (x,y) from tracks DCA @@ -199,29 +897,33 @@ void AliVertexerTracks::VertexFinder(Int_t optUseWeights) { Int_t ncombi = 0; AliESDtrack *track1; AliESDtrack *track2; + Double_t pos[3],dir[3]; Double_t alpha,mindist; - Double_t field=GetField(); + Double_t field=GetFieldkG(); for(Int_t i=0; iGetAlpha(); 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); - Double_t pos[3]; track1->GetXYZAt(mindist,field,pos); - Double_t dir[3]; track1->GetPxPyPzAt(mindist,field,dir); - AliStrLine *line1 = new AliStrLine(pos,dir); + // AliStrLine *line1 = new AliStrLine(); + // track1->ApproximateHelixWithLine(mindist,field,line1); for(Int_t j=i+1; jGetAlpha(); mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; - - Double_t pos[3]; track2->GetXYZAt(mindist,field,pos); - Double_t dir[3]; track2->GetPxPyPzAt(mindist,field,dir); - AliStrLine *line2 = new AliStrLine(pos,dir); - + 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&&distCA0&&distCA0){ Int_t retcode = line1->CrossPoints(line2,pnt1,pnt2); if(retcode>=0){ - Double_t alpha, cs, sn; + Double_t 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(); @@ -263,6 +965,7 @@ void AliVertexerTracks::VertexFinder(Int_t optUseWeights) { if(ncombi>0){ for(Int_t jj=0;jj<3;jj++){ initPos[jj] = aver[jj]/ncombi; + //printf("%f\n",initPos[jj]); aversq[jj]/=ncombi; sigmasq[jj]=aversq[jj]-initPos[jj]*initPos[jj]; sigma+=sigmasq[jj]; @@ -278,254 +981,268 @@ void AliVertexerTracks::VertexFinder(Int_t optUseWeights) { fVert.SetNContributors(ncombi); } //--------------------------------------------------------------------------- -void AliVertexerTracks::HelixVertexFinder() { - - // Get estimate of vertex position in (x,y) from tracks DCA - - +void AliVertexerTracks::VertexFitter(Bool_t useConstraint) +{ +// +// The optimal estimate of the vertex position is given by a "weighted +// average of tracks positions" +// Original method: V. Karimaki, CMS Note 97/0051 +// Double_t initPos[3]; - initPos[2] = 0.; - for(Int_t i=0;i<2;i++)initPos[i]=fNominalPos[i]; - Double_t field=GetField(); + fVert.GetXYZ(initPos); + Int_t arrEntries = (Int_t)fTrkArray.GetEntries(); + if(arrEntries==1) useConstraint=kTRUE; + if(fDebug) { + printf(" VertexFitter(): start\n"); + 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(useConstraint) 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 nacc = (Int_t)fTrkArray.GetEntriesFast(); + Int_t i,j,k,step=0; + TMatrixD rv(3,1); + TMatrixD vV(3,3); + rv(0,0) = initPos[0]; + rv(1,0) = initPos[1]; + rv(2,0) = 0.; + Double_t xlStart,alpha; + Int_t nUsedTrks; + Double_t chi2,chi2i,chi2b; + AliESDtrack *t = 0; + Int_t failed = 0; - Double_t aver[3]={0.,0.,0.}; - Double_t averquad[3]={0.,0.,0.}; - Double_t sigmaquad[3]={0.,0.,0.}; - Double_t sigma=0; - Int_t ncombi = 0; - AliESDtrack *track1; - AliESDtrack *track2; - Double_t distCA; - Double_t x, par[5]; - Double_t alpha, cs, sn; - Double_t crosspoint[3]; - for(Int_t i=0; iPropagateToDCA(track1,field); + // 2 steps: + // 1st - estimate of vtx using all tracks + // 2nd - estimate of global chi2 + for(step=0; step<2; step++) { + if(fDebug) printf(" step = %d\n",step); + chi2 = 0.; + nUsedTrks = 0; - if(fDCAcut<=0 ||(fDCAcut>0&&distCAGetExternalParameters(x,par); - alpha=track1->GetAlpha(); - cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); - Double_t x1=x*cs - par[0]*sn; - Double_t y1=x*sn + par[0]*cs; - Double_t z1=par[1]; - Double_t sx1=sn*sn*track1->GetSigmaY2(), sy1=cs*cs*track1->GetSigmaY2(); - track2->GetExternalParameters(x,par); - alpha=track2->GetAlpha(); - cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); - Double_t x2=x*cs - par[0]*sn; - Double_t y2=x*sn + par[0]*cs; - Double_t z2=par[1]; - 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*x1 + wx2*x2; - crosspoint[1]=wy1*y1 + wy2*y2; - crosspoint[2]=wz1*z1 + wz2*z2; + TMatrixD sumWiri(3,1); + TMatrixD sumWi(3,3); + for(i=0; i<3; i++) { + sumWiri(i,0) = 0.; + for(j=0; j<3; j++) sumWi(j,i) = 0.; + } - ncombi++; - for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj]; - for(Int_t jj=0;jj<3;jj++)averquad[jj]+=(crosspoint[jj]*crosspoint[jj]); + // mean vertex constraint + if(useConstraint) { + for(i=0;i<3;i++) { + sumWiri(i,0) += vVbInvrb(i,0); + for(k=0;k<3;k++) sumWi(i,k) += vVbInv(i,k); } + // chi2 + TMatrixD deltar = rv; deltar -= rb; + TMatrixD vVbInvdeltar(vVbInv,TMatrixD::kMult,deltar); + chi2b = deltar(0,0)*vVbInvdeltar(0,0)+ + deltar(1,0)*vVbInvdeltar(1,0)+ + deltar(2,0)*vVbInvdeltar(2,0); + chi2 += chi2b; } - - } - if(ncombi>0){ - for(Int_t jj=0;jj<3;jj++){ - initPos[jj] = aver[jj]/ncombi; - averquad[jj]/=ncombi; - sigmaquad[jj]=averquad[jj]-initPos[jj]*initPos[jj]; - sigma+=sigmaquad[jj]; - } - sigma=TMath::Sqrt(TMath::Abs(sigma)); - } - else { - Warning("HelixVertexFinder","Finder did not succed"); - sigma=999; - } - fVert.SetXYZ(initPos); - fVert.SetDispersion(sigma); - fVert.SetNContributors(ncombi); -} -//--------------------------------------------------------------------------- -void AliVertexerTracks::StrLinVertexFinderMinDist(Int_t optUseWeights){ - // Calculate the point at minimum distance to prepared tracks - - Double_t initPos[3]; - initPos[2] = 0.; - Double_t sigma=0; - for(Int_t i=0;i<2;i++)initPos[i]=fNominalPos[i]; - const Int_t knacc = (Int_t)fTrkArray.GetEntriesFast(); - Double_t field=GetField(); - AliESDtrack *track1; - Double_t (*vectP0)[3]=new Double_t [knacc][3]; - Double_t (*vectP1)[3]=new Double_t [knacc][3]; - - Double_t sum[3][3]; - Double_t dsum[3]={0,0,0}; - for(Int_t i=0;i<3;i++) - for(Int_t j=0;j<3;j++)sum[i][j]=0; - for(Int_t i=0; iGetAlpha(); - Double_t mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; + // loop on tracks + for(k=0; kGetAlpha(); + xlStart = initPos[0]*TMath::Cos(alpha)+initPos[1]*TMath::Sin(alpha); + // to vtxSeed (from finder) + t->AliExternalTrackParam::PropagateTo(xlStart,GetFieldkG()); + - Double_t pos[3]; track1->GetXYZAt(mindist,field,pos); - Double_t dir[3]; track1->GetPxPyPzAt(mindist,field,dir); - AliStrLine *line1 = new AliStrLine(pos,dir); + // vector of track global coordinates + TMatrixD ri(3,1); + // covariance matrix of ri + TMatrixD wWi(3,3); - Double_t p0[3],cd[3]; - line1->GetP0(p0); - line1->GetCd(cd); - Double_t p1[3]={p0[0]+cd[0],p0[1]+cd[1],p0[2]+cd[2]}; - vectP0[i][0]=p0[0]; - vectP0[i][1]=p0[1]; - vectP0[i][2]=p0[2]; - vectP1[i][0]=p1[0]; - vectP1[i][1]=p1[1]; - vectP1[i][2]=p1[2]; - - Double_t matr[3][3]; - Double_t dknow[3]; - if(optUseWeights==0)GetStrLinDerivMatrix(p0,p1,matr,dknow); - if(optUseWeights==1){ - Double_t sigmasq[3]; - sigmasq[0]=track1->GetSigmaY2(); - sigmasq[1]=track1->GetSigmaY2(); - sigmasq[2]=track1->GetSigmaZ2(); - GetStrLinDerivMatrix(p0,p1,sigmasq,matr,dknow); - } + // get space point from track + if(!TrackToPoint(t,ri,wWi)) continue; - for(Int_t iii=0;iii<3;iii++){ - dsum[iii]+=dknow[iii]; - for(Int_t lj=0;lj<3;lj++) sum[iii][lj]+=matr[iii][lj]; + TMatrixD wWiri(wWi,TMatrixD::kMult,ri); + + // track chi2 + TMatrixD deltar = rv; deltar -= ri; + TMatrixD wWideltar(wWi,TMatrixD::kMult,deltar); + chi2i = deltar(0,0)*wWideltar(0,0)+ + deltar(1,0)*wWideltar(1,0)+ + deltar(2,0)*wWideltar(2,0); + + // add to total chi2 + chi2 += chi2i; + + sumWiri += wWiri; + sumWi += wWi; + + nUsedTrks++; + } // end loop on tracks + + if(nUsedTrks < fMinTracks) { + failed=1; + continue; } - delete line1; - } - - Double_t vett[3][3]; - Double_t det=GetDeterminant3X3(sum); - - if(det!=0){ - for(Int_t zz=0;zz<3;zz++){ - for(Int_t ww=0;ww<3;ww++){ - for(Int_t kk=0;kk<3;kk++) vett[ww][kk]=sum[ww][kk]; - } - for(Int_t kk=0;kk<3;kk++) vett[kk][zz]=dsum[kk]; - initPos[zz]=GetDeterminant3X3(vett)/det; - } - - - for(Int_t i=0; iPrintStatus(); + } - 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; + return; +} +//---------------------------------------------------------------------------- +AliESDVertex* AliVertexerTracks::VertexForSelectedTracks(TTree *trkTree,Bool_t optUseFitter,Bool_t optPropagate) +{ +// +// Return vertex from tracks in trkTree +// - 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]; + SetConstraintOff(); - 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 tracks and propagate them to initial vertex position + Int_t nTrksPrep = PrepareTracks(*trkTree,0); + if(nTrksPrep < TMath::Max(2,fMinTracks) ) { + if(fDebug) printf("TooFewTracks\n"); + fCurrentVertex = new AliESDVertex(0.,0.,-1); + return fCurrentVertex; + } + + 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; + } + + if(fDebug) printf(" Vertex finding completed\n"); - 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]; + // vertex fitter + if(optUseFitter){ + VertexFitter(fConstraint); + if(fDebug) printf(" Vertex fit completed\n"); + }else{ + Double_t position[3]={fVert.GetXv(),fVert.GetYv(),fVert.GetZv()}; + Double_t covmatrix[6]={0.,0.,0.,0.,0.,0.}; + Double_t chi2=99999.; + Int_t nUsedTrks=fVert.GetNContributors(); + fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nUsedTrks); + } + fCurrentVertex->SetDispersion(fVert.GetDispersion()); - 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]; + // set indices of used tracks and propagate track to found vertex + UShort_t *indices = 0; + AliESDtrack *eta = 0; + if(fCurrentVertex->GetNContributors()>0) { + indices = new UShort_t[fCurrentVertex->GetNContributors()]; + for(Int_t jj=0;jj<(Int_t)fTrkArray.GetEntriesFast();jj++) { + eta = (AliESDtrack*)fTrkArray.At(jj); + indices[jj] = (UShort_t)eta->GetID(); + if(optPropagate&&optUseFitter){ + if(TMath::Sqrt(fCurrentVertex->GetXv()*fCurrentVertex->GetXv()+fCurrentVertex->GetYv()*fCurrentVertex->GetYv())<3.) { + eta->RelateToVertex(fCurrentVertex,GetFieldkG(),100.); + if(fDebug) printf("Track %d propagated to found vertex\n",jj); + }else{ + AliWarning("Found vertex outside beam pipe!"); + } + } + } + fCurrentVertex->SetIndices(fCurrentVertex->GetNContributors(),indices); + } + delete [] indices; + fTrkArray.Delete(); + + return fCurrentVertex; } -//_____________________________________________________________________________ -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); +//---------------------------------------------------------------------------- +AliESDVertex* AliVertexerTracks::VertexForSelectedTracks(TObjArray *trkArray,Bool_t optUseFitter, Bool_t optPropagate) +{ +// +// Return vertex from array of tracks +// + + // get tracks and propagate them to initial vertex position + Int_t nTrks = trkArray->GetEntriesFast(); + if(nTrks < TMath::Max(2,fMinTracks) ) { + if(fDebug) printf("TooFewTracks\n"); + fCurrentVertex = new AliESDVertex(0.,0.,-1); + return fCurrentVertex; + } + TTree *trkTree = new TTree("TreeT","tracks"); + AliESDtrack *esdTrack = 0; + trkTree->Branch("tracks","AliESDtrack",&esdTrack); + for(Int_t i=0; iAt(i); + trkTree->Fill(); + } + + AliESDVertex *vtx = VertexForSelectedTracks(trkTree,optUseFitter,optPropagate); + delete trkTree; + return vtx; } +//--------------------------------------------------------------------------