X-Git-Url: http://git.uio.no/git/?a=blobdiff_plain;f=STEER%2FAliVertexerTracks.cxx;h=55047b699cb241f7cb7e23f98e3671df1960908d;hb=cd0b062ee75901922745272a5244b6e686db4349;hp=661dff7e264c41b6eeb358bd0fbc12bc68d6a017;hpb=6c94f3308e8e21efdd662a43a6a60db688334d59;p=u%2Fmrichter%2FAliRoot.git diff --git a/STEER/AliVertexerTracks.cxx b/STEER/AliVertexerTracks.cxx index 661dff7e264..55047b699cb 100644 --- a/STEER/AliVertexerTracks.cxx +++ b/STEER/AliVertexerTracks.cxx @@ -26,12 +26,15 @@ //----------------------------------------------------------------- //---- Root headers -------- +#include +#include +#include #include #include //---- AliRoot headers ----- #include "AliStrLine.h" #include "AliVertexerTracks.h" -#include "AliESD.h" +#include "AliESDEvent.h" #include "AliESDtrack.h" ClassImp(AliVertexerTracks) @@ -42,7 +45,10 @@ AliVertexerTracks::AliVertexerTracks(): TObject(), fVert(), fCurrentVertex(0), -fMinTracks(2), +fFieldkG(-999.), +fConstraint(kFALSE), +fOnlyFitter(kFALSE), +fMinTracks(1), fMinITSClusters(5), fTrkArray(), fTrksToSkip(0), @@ -50,6 +56,10 @@ fNTrksToSkip(0), fDCAcut(0), fAlgo(1), fNSigma(3), +fMaxd0z0(0.5), +fITSin(kTRUE), +fITSrefit(kTRUE), +fnSigmaForUi00(1.5), fDebug(0) { // @@ -60,13 +70,17 @@ fDebug(0) SetMinTracks(); SetMinITSClusters(); SetNSigmad0(); + SetMaxd0z0(); } -//----------------------------------------------------------------------------- -AliVertexerTracks::AliVertexerTracks(Double_t xStart, Double_t yStart): +//---------------------------------------------------------------------------- +AliVertexerTracks::AliVertexerTracks(Double_t fieldkG): TObject(), fVert(), fCurrentVertex(0), -fMinTracks(2), +fFieldkG(-999.), +fConstraint(kFALSE), +fOnlyFitter(kFALSE), +fMinTracks(1), fMinITSClusters(5), fTrkArray(), fTrksToSkip(0), @@ -74,530 +88,1002 @@ fNTrksToSkip(0), fDCAcut(0), fAlgo(1), fNSigma(3), +fMaxd0z0(0.5), +fITSin(kTRUE), +fITSrefit(kTRUE), +fnSigmaForUi00(1.5), fDebug(0) { // // Standard constructor // - SetVtxStart(xStart,yStart); + SetVtxStart(); SetVtxStartSigma(); SetMinTracks(); SetMinITSClusters(); SetNSigmad0(); + SetMaxd0z0(); + SetFieldkG(fieldkG); } //----------------------------------------------------------------------------- -AliVertexerTracks::~AliVertexerTracks() { +AliVertexerTracks::~AliVertexerTracks() +{ // Default Destructor // The objects pointed by the following pointer are not owned // by this class and are not deleted 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;iRelateToVertex(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); - 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; + if(fTrksToSkip) { delete [] fTrksToSkip; fTrksToSkip=NULL; } } //---------------------------------------------------------------------------- -AliESDVertex* AliVertexerTracks::FindPrimaryVertex(const AliESD *esdEvent) +AliESDVertex* AliVertexerTracks::FindPrimaryVertex(const AliESDEvent *esdEvent) { // // Primary vertex for current ESD event // (Two iterations: -// 1st with 5*fNSigma*sigma(pt) cut w.r.t. to initial vertex; -// 2nd with fNSigma*sigma(pt) cut w.r.t. to vertex found in 1st iteration) +// 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; - Int_t entr = (Int_t)esdEvent->GetNumberOfTracks(); + // accept 1-track case only if constraint is available + if(!fConstraint && fMinTracks==1) fMinTracks=2; + + // read tracks from ESD + Int_t nTrksTot = (Int_t)esdEvent->GetNumberOfTracks(); + if(nTrksTot<=0) { + if(fDebug) printf("TooFewTracks\n"); + TooFewTracks(esdEvent); + return fCurrentVertex; + } + + TDirectory * olddir = gDirectory; + TFile f("VertexerTracks.root","recreate"); TTree *trkTree = new TTree("TreeT","tracks"); AliESDtrack *esdTrack = 0; trkTree->Branch("tracks","AliESDtrack",&esdTrack); Bool_t skipThis; - for(Int_t i=0; iGetTrack(i); // 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) continue; - AliESDtrack *et = esdEvent->GetTrack(i); + if(fITSin) { + if(!(et->GetStatus()&AliESDtrack::kITSin)) continue; + if(fITSrefit && !(et->GetStatus()&AliESDtrack::kITSrefit)) continue; + Int_t nclus=et->GetNcls(0); // check number of clusters in ITS + if(nclusGetStatus()&AliESDtrack::kITSin) continue; - if(!esdTrack->GetStatus()&AliESDtrack::kITSrefit) continue; - Int_t nclus=esdTrack->GetNcls(0); // check number of clusters in ITS - if(nclusFill(); + 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"); - TooFewTracks(esdEvent); - if(fDebug) fCurrentVertex->PrintStatus(); - return fCurrentVertex; - } - - // 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; + + // 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"); + } } - if(fDebug) printf(" vertex finding completed\n"); - - // vertex fitter - VertexFitter(kTRUE); - if(fDebug) printf(" vertex fit completed\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) - nTrks = PrepareTracks(*trkTree,2); - delete trkTree; - if(fDebug) printf(" tracks prepared - step 2: %d\n",nTrks); - if(nTrks < fMinTracks) { - printf("TooFewTracks\n"); - TooFewTracks(esdEvent); - if(fDebug) fCurrentVertex->PrintStatus(); - return 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; + f.Close(); + gSystem->Unlink("VertexerTracks.root"); + olddir->cd(); + 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 + + + if(fConstraint) { + if(fOnlyFitter) { + fCurrentVertex->SetTitle("VertexerTracksWithConstraintOnlyFitter"); + } else { + fCurrentVertex->SetTitle("VertexerTracksWithConstraint"); + } + } else { + fCurrentVertex->SetTitle("VertexerTracksNoConstraint"); } - // 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; + + // 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); } - if(fDebug) printf(" vertex finding completed\n"); + delete [] indices; - // fitter - VertexFitter(kTRUE); - if(fDebug) printf(" vertex fit completed\n"); + delete trkTree; + f.Close(); + gSystem->Unlink("VertexerTracks.root"); + olddir->cd(); + fTrkArray.Delete(); - fTrkArray.Clear(); + if(fTrksToSkip) { delete [] fTrksToSkip; fTrksToSkip=NULL; } - // take true pos from ESD - Double_t tp[3]; - esdEvent->GetVertex()->GetTruePos(tp); - fCurrentVertex->SetTruePos(tp); - if(fNominalSigma[0]>1.) { - fCurrentVertex->SetTitle("VertexerTracksNoConstraint"); - } else { - fCurrentVertex->SetTitle("VertexerTracksWithConstraint"); - } if(fDebug) fCurrentVertex->PrintStatus(); - if(fTrksToSkip) delete [] fTrksToSkip; + if(fDebug) fCurrentVertex->PrintIndices(); + return fCurrentVertex; } -//---------------------------------------------------------------------------- -AliESDVertex* AliVertexerTracks::FindPrimaryVertexOld(const AliESD *esdEvent) +//------------------------------------------------------------------------ +Double_t AliVertexerTracks::GetDeterminant3X3(Double_t matr[][3]) { -// -// Primary vertex for current ESD event (one iteration with |d0rphi|<3cm) -// - fCurrentVertex = 0; + // + 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; - Int_t entr = (Int_t)esdEvent->GetNumberOfTracks(); - TTree *trkTree = new TTree("TreeT","tracks"); - AliESDtrack *esdTrack = 0; - trkTree->Branch("tracks","AliESDtrack",&esdTrack); +} +//-------------------------------------------------------------------------- +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]; - for(Int_t i=0; iGetTrack(i); - esdTrack = new AliESDtrack(*et); - if(!esdTrack->GetStatus()&AliESDtrack::kITSin) continue; - if(!esdTrack->GetStatus()&AliESDtrack::kITSrefit) continue; - Int_t nclus=esdTrack->GetNcls(0); // check number of clusters in ITS - if(nclusFill(); - } - delete esdTrack; + Double_t kk= 2*(x12*x12/sigmasq[0]+y12*y12/sigmasq[1]+z12*z12/sigmasq[2]); - // 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); - return fCurrentVertex; - } + Double_t cc[3]; + cc[0]=-x12/sigmasq[0]; + cc[1]=-y12/sigmasq[1]; + cc[2]=-z12/sigmasq[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 ww=(-p0[0]*x12*sigmasq[1]*sigmasq[2]-p0[1]*y12*sigmasq[0]*sigmasq[2]-p0[2]*z12*sigmasq[0]*sigmasq[1])/den; - // VERTEX FITTER - VertexFitter(); - if(fDebug) printf(" vertex fit completed\n"); + 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; - Double_t tp[3]; - esdEvent->GetVertex()->GetTruePos(tp); - fCurrentVertex->SetTruePos(tp); - fCurrentVertex->SetTitle("VertexerTracks"); + 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]; - fTrkArray.Clear(); - return fCurrentVertex; -} -//---------------------------------------------------------------------------- -AliVertex* AliVertexerTracks::VertexForSelectedTracks(TObjArray *trkArray) { -// -// Return vertex from array of tracks -// + 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]; - // 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(); +//-------------------------------------------------------------------------- +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; } - - AliVertex *vtx = VertexForSelectedTracks(trkTree); - delete trkTree; - return vtx; + delete zeta; + delete line1; + fVert.SetXYZ(crosspoint); + fVert.SetDispersion(sigma); + fVert.SetNContributors(nContrib); } - //--------------------------------------------------------------------------- -void AliVertexerTracks::VertexFinder(Int_t optUseWeights) { - +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 aversq[3]={0.,0.,0.}; - Double_t sigmasq[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 pos[3],dir[3]; - Double_t alpha,mindist; - Double_t field=GetField(); - + Double_t distCA; + Double_t x, par[5]; + Double_t alpha, cs, sn; + Double_t crosspoint[3]; 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); + - // 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]; - 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&&distCACross(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]); - } - } + distCA=track2->PropagateToDCA(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]); } - 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]; + averquad[jj]/=ncombi; + sigmaquad[jj]=averquad[jj]-initPos[jj]*initPos[jj]; + sigma+=sigmaquad[jj]; } sigma=TMath::Sqrt(TMath::Abs(sigma)); } else { - Warning("VertexFinder","Finder did not succed"); + 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 optImpParCut) +{ +// +// Propagate tracks to initial vertex position and store them in a TObjArray +// + 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.Delete(); + + if(fDebug) { + printf(" PrepareTracks()\n"); + } + + for(Int_t i=0; iRelateToVertex(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; +} //--------------------------------------------------------------------------- -void AliVertexerTracks::HelixVertexFinder() { +AliESDVertex* AliVertexerTracks::RemoveTracksFromVertex(AliESDVertex *inVtx, + TTree *trksTree, + Float_t *diamondxy) +{ +// +// Removes tracks in trksTree from fit of inVtx +// - // Get estimate of vertex position in (x,y) from tracks DCA + if(!strstr(inVtx->GetTitle(),"VertexerTracksWithConstraint")) { + printf("ERROR: primary vertex has no constraint: cannot remove tracks\n"); + return 0x0; + } + 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; + } + } + + 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()); + 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;iGetXYZ(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(); + TMatrixD ri(3,1); + TMatrixD wWi(3,3); + if(!TrackToPoint(track1,ri,wWi)) continue; + Double_t wmat[9]; + Int_t iel=0; + for(Int_t ia=0;ia<3;ia++){ + for(Int_t ib=0;ib<3;ib++){ + wmat[iel]=wWi(ia,ib); + iel++; + } + } + new(lines[i]) AliStrLine(pos,sigmasq,wmat,dir); + } + fVert=TrackletVertexFinder(linarray,optUseWeights); + linarray->Delete(); + delete linarray; +} +//--------------------------------------------------------------------------- +AliESDVertex 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}; + TMatrixD sumWi(3,3); + for(Int_t i=0;i<3;i++){ + for(Int_t j=0;j<3;j++){ + sum[i][j]=0; + sumWi(i,j)=0.; + } + } + + for(Int_t i=0; iAt(i); + Double_t p0[3],cd[3],sigmasq[3]; + Double_t wmat[9]; + line1->GetP0(p0); + line1->GetCd(cd); + line1->GetSigma2P0(sigmasq); + line1->GetWMatrix(wmat); + TMatrixD wWi(3,3); + Int_t iel=0; + for(Int_t ia=0;ia<3;ia++){ + for(Int_t ib=0;ib<3;ib++){ + wWi(ia,ib)=wmat[iel]; + iel++; + } + } + + sumWi+=wWi; + + 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]; + } + } + + TMatrixD invsumWi(TMatrixD::kInverted,sumWi); + Double_t covmatrix[6]; + covmatrix[0] = invsumWi(0,0); + covmatrix[1] = invsumWi(0,1); + covmatrix[2] = invsumWi(1,1); + covmatrix[3] = invsumWi(0,2); + covmatrix[4] = invsumWi(1,2); + covmatrix[5] = invsumWi(2,2); + + 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); + + ri(0,0) = t->GetX()*cosRot-t->GetY()*sinRot; + ri(1,0) = t->GetX()*sinRot+t->GetY()*cosRot; + ri(2,0) = t->GetZ(); + + + + if(!uUi3by3) { + // 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.; + + // covariance matrix of local (y,z) - inverted + Double_t cc[15]; + t->GetExternalCovariance(cc); + TMatrixD uUi(2,2); + uUi(0,0) = cc[0]; + uUi(0,1) = cc[1]; + uUi(1,0) = cc[1]; + uUi(1,1) = cc[2]; + //printf(" Ui :\n"); + //printf(" %f %f\n",uUi(0,0),uUi(0,1)); + //printf(" %f %f\n",uUi(1,0),uUi(1,1)); + + 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; + } else { + if(fVert.GetNContributors()<1) AliFatal("Vertex from finder is empty"); + // matrix to go from global (x,y,z) to local (x,y,z); + TMatrixD qQi(3,3); + qQi(0,0) = cosRot; + qQi(0,1) = sinRot; + qQi(0,2) = 0.; + qQi(1,0) = -sinRot; + qQi(1,1) = cosRot; + qQi(1,2) = 0.; + qQi(2,0) = 0.; + qQi(2,1) = 0.; + qQi(2,2) = 1.; + + // covariance of fVert along the track + Double_t p[3],pt,ptot; + t->GetPxPyPz(p); + pt = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]); + ptot = TMath::Sqrt(pt*pt+p[2]*p[2]); + Double_t cphi = p[0]/pt; //cos(phi)=px/pt + Double_t sphi = p[1]/pt; //sin(phi)=py/pt + Double_t clambda = pt/ptot; //cos(lambda)=pt/ptot + Double_t slambda = p[2]/ptot; //sin(lambda)=pz/ptot + Double_t covfVert[6]; + fVert.GetCovMatrix(covfVert); + Double_t covfVertalongt = + covfVert[0]*cphi*cphi*clambda*clambda + +covfVert[1]*2.*cphi*sphi*clambda*clambda + +covfVert[3]*2.*cphi*clambda*slambda + +covfVert[2]*sphi*sphi*clambda*clambda + +covfVert[4]*2.*sphi*clambda*slambda + +covfVert[5]*slambda*slambda; + Double_t cc[15]; + t->GetExternalCovariance(cc); + // covariance matrix of local (x,y,z) - inverted + TMatrixD uUi(3,3); + uUi(0,0) = covfVertalongt * fnSigmaForUi00 * fnSigmaForUi00; + if(fDebug) printf("=====> sqrtUi00 cm %f\n",TMath::Sqrt(uUi(0,0))); + uUi(0,1) = 0.; + uUi(0,2) = 0.; + uUi(1,0) = 0.; + uUi(1,1) = cc[0]; + uUi(1,2) = cc[1]; + uUi(2,0) = 0.; + uUi(2,1) = cc[1]; + uUi(2,2) = cc[2]; + //printf(" Ui :\n"); + //printf(" %f %f\n",uUi(0,0),uUi(0,1)); + //printf(" %f %f\n",uUi(1,0),uUi(1,1)); + + 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 AliESDEvent* esdEvent) +{ +// +// When the number of tracks is < fMinTracks +// + + // 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); + + if(fConstraint) { + fCurrentVertex->SetTitle("VertexerTracksWithConstraint"); + } else { + fCurrentVertex->SetTitle("VertexerTracksNoConstraint"); + } + + return; +} +//--------------------------------------------------------------------------- +void AliVertexerTracks::VertexFinder(Int_t optUseWeights) +{ + + // 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=GetField(); - 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 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 distCA; - Double_t x, par[5]; - Double_t alpha, cs, sn; - Double_t crosspoint[3]; + Double_t pos[3],dir[3]; + Double_t alpha,mindist; + 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); + // 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]; + 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); + //printf("%d %d %f\n",i,j,distCA); + if(fDCAcut<=0 || (fDCAcut>0&&distCAPropagateToDCA(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(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 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; - averquad[jj]/=ncombi; - sigmaquad[jj]=averquad[jj]-initPos[jj]*initPos[jj]; - sigma+=sigmaquad[jj]; + //printf("%f\n",initPos[jj]); + aversq[jj]/=ncombi; + sigmasq[jj]=aversq[jj]-initPos[jj]*initPos[jj]; + sigma+=sigmasq[jj]; } sigma=TMath::Sqrt(TMath::Abs(sigma)); } else { - Warning("HelixVertexFinder","Finder did not succed"); + Warning("VertexFinder","Finder did not succed"); sigma=999; } fVert.SetXYZ(initPos); @@ -605,196 +1091,35 @@ void AliVertexerTracks::HelixVertexFinder() { 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]; - Double_t pos[3],dir[3]; - track1->GetXYZAt(mindist,field,pos); - track1->GetPxPyPzAt(mindist,field,dir); - AliStrLine *line1 = new AliStrLine(pos,dir); - // AliStrLine *line1 = new AliStrLine(); - // track1->ApproximateHelixWithLine(mindist,field,line1); - - 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); - } - - 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]; - } - 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; iGetAlpha(); xlStart = initPos[0]*TMath::Cos(alpha)+initPos[1]*TMath::Sin(alpha); - t->AliExternalTrackParam::PropagateTo(xlStart,AliTracker::GetBz()); // to vtxSeed - rotAngle = alpha; - if(alpha<0.) rotAngle += 2.*TMath::Pi(); - cosRot = TMath::Cos(rotAngle); - sinRot = TMath::Sin(rotAngle); - + // to vtxSeed (from finder) + t->AliExternalTrackParam::PropagateTo(xlStart,GetFieldkG()); + // vector of track global coordinates TMatrixD ri(3,1); - 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.; - - // covariance matrix of local (y,z) - inverted - TMatrixD uUi(2,2); - t->GetExternalCovariance(cc); - uUi(0,0) = cc[0]; - uUi(0,1) = cc[1]; - uUi(1,0) = cc[1]; - uUi(1,1) = cc[2]; - - // weights matrix: wWi = qQiT * uUiInv * qQi - if(uUi.Determinant() <= 0.) continue; - TMatrixD uUiInv(TMatrixD::kInverted,uUi); - TMatrixD uUiInvQi(uUiInv,TMatrixD::kMult,qQi); - TMatrixD wWi(qQi,TMatrixD::kTransposeMult,uUiInvQi); + // covariance matrix of ri + TMatrixD wWi(3,3); + + // get space point from track + if(!TrackToPoint(t,ri,wWi,uUi3by3)) continue; + TMatrixD wWiri(wWi,TMatrixD::kMult,ri); // track chi2 TMatrixD deltar = rv; deltar -= ri; @@ -882,12 +1208,9 @@ void AliVertexerTracks::VertexFitter(Bool_t useNominalVtx) { deltar(1,0)*wWideltar(1,0)+ deltar(2,0)*wWideltar(2,0); - // add to total chi2 chi2 += chi2i; - TMatrixD wWiri(wWi,TMatrixD::kMult,ri); - sumWiri += wWiri; sumWi += wWi; @@ -907,19 +1230,17 @@ void AliVertexerTracks::VertexFitter(Bool_t useNominalVtx) { continue; } - // inverted of weights matrix - TMatrixD invsumWi(TMatrixD::kInverted,sumWi); - vV = invsumWi; - - // position of primary vertex - rv.Mult(vV,sumWiri); - + if(step==0) { + // inverted of weights matrix + TMatrixD invsumWi(TMatrixD::kInverted,sumWi); + vV = invsumWi; + // position of primary vertex + rv.Mult(vV,sumWiri); + } } // end loop on the 2 steps - delete t; - if(failed) { - printf("TooFewTracks\n"); + if(fDebug) printf("TooFewTracks\n"); fCurrentVertex = new AliESDVertex(0.,0.,-1); return; } @@ -936,50 +1257,116 @@ void AliVertexerTracks::VertexFitter(Bool_t useNominalVtx) { covmatrix[4] = vV(1,2); covmatrix[5] = vV(2,2); + // for correct chi2/ndf, count constraint as additional "track" + if(fConstraint) nUsedTrks++; // store data in the vertex object fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nUsedTrks); if(fDebug) { - printf(" VertexFitter(): finish\n"); - printf(" rv = ( %f , %f , %f )\n\n",rv(0,0),rv(1,0),rv(2,0)); + printf(" Vertex after fit:\n"); fCurrentVertex->PrintStatus(); + printf("--- VertexFitter(): finish\n"); } return; } -//--------------------------------------------------------------------------- -void AliVertexerTracks::TooFewTracks(const AliESD* esdEvent) { +//---------------------------------------------------------------------------- +AliESDVertex* AliVertexerTracks::VertexForSelectedTracks(TTree *trkTree,Bool_t optUseFitter,Bool_t optPropagate) +{ // -// 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); + SetConstraintOff(); - 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,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"); - return; + // vertex fitter + if(optUseFitter){ + //SetVtxStart(&fVert); + VertexFitter(fConstraint); + if(fDebug) printf(" Vertex fit completed\n"); + }else{ + Double_t position[3]={fVert.GetXv(),fVert.GetYv(),fVert.GetZv()}; + Double_t covmatrix[6]; + fVert.GetCovMatrix(covmatrix); + Double_t chi2=99999.; + Int_t nUsedTrks=fVert.GetNContributors(); + fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nUsedTrks); + } + fCurrentVertex->SetDispersion(fVert.GetDispersion()); + + + // 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; +} +//---------------------------------------------------------------------------- +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; + } + TDirectory * olddir = gDirectory; + TFile f("VertexerTracks.root","recreate"); + 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; + f.Close(); + gSystem->Unlink("VertexerTracks.root"); + olddir->cd(); + return vtx; } +//--------------------------------------------------------------------------