--- /dev/null
+/**************************************************************************
+ * Copyright(c) 2006-2008, ALICE Experiment at CERN, All rights reserved. *
+ * *
+ * Author: The ALICE Off-line Project. *
+ * Contributors are mentioned in the code where appropriate. *
+ * *
+ * Permission to use, copy, modify and distribute this software and its *
+ * documentation strictly for non-commercial purposes is hereby granted *
+ * without fee, provided that the above copyright notice appears in all *
+ * copies and that both the copyright notice and this permission notice *
+ * appear in the supporting documentation. The authors make no claims *
+ * about the suitability of this software for any purpose. It is *
+ * provided "as is" without express or implied warranty. *
+ **************************************************************************/
+#include <AliESDVertex.h>
+#include <AliITSVertexer3D.h>
+#include <AliStrLine.h>
+#include <AliVertexerTracks.h>
+#include <Riostream.h>
+#include <TH3F.h>
+#include <TTree.h>
+#include<TClonesArray.h>
+#include "AliRunLoader.h"
+#include "AliITSLoader.h"
+#include "AliITSgeom.h"
+#include "AliITSDetTypeRec.h"
+#include "AliITSRecPoint.h"
+/////////////////////////////////////////////////////////////////
+// this class implements a method to determine
+// the 3 coordinates of the primary vertex
+// for p-p collisions
+// It can be used successfully with Pb-Pb collisions
+////////////////////////////////////////////////////////////////
+
+ClassImp(AliITSVertexer3D)
+
+//______________________________________________________________________
+AliITSVertexer3D::AliITSVertexer3D():AliITSVertexer(),
+fLines(),
+fVert3D(),
+fCoarseDiffPhiCut(0.),
+fMaxRCut(0.),
+fZCutDiamond(0.),
+fDCAcut(0.),
+fDiffPhiMax(0.) {
+ // Default constructor
+ SetCoarseDiffPhiCut();
+ SetMaxRCut();
+ SetZCutDiamond();
+ SetDCAcut();
+ SetDiffPhiMax();
+
+}
+
+//______________________________________________________________________
+AliITSVertexer3D::AliITSVertexer3D(TString fn): AliITSVertexer(fn),
+fLines(),
+fVert3D(),
+fCoarseDiffPhiCut(0.),
+fMaxRCut(0.),
+fZCutDiamond(0.),
+fDCAcut(0.),
+fDiffPhiMax(0.) {
+ // Standard constructor
+ fLines = new TClonesArray("AliStrLine",1000);
+ SetCoarseDiffPhiCut();
+ SetMaxRCut();
+ SetZCutDiamond();
+ SetDCAcut();
+ SetDiffPhiMax();
+}
+
+//______________________________________________________________________
+AliITSVertexer3D::~AliITSVertexer3D() {
+ // Destructor
+ fVert3D = 0; // this object is not owned by this class
+ if(fLines){
+ fLines->Delete();
+ delete fLines;
+ }
+}
+
+//______________________________________________________________________
+AliESDVertex* AliITSVertexer3D::FindVertexForCurrentEvent(Int_t evnumber){
+ // Defines the AliESDVertex for the current event
+ if (fDebug) cout<<"\n \n FindVertexForCurrentEvent - 3D - PROCESSING EVENT "<<evnumber<<endl;
+ fVert3D = 0;
+ if(fLines)fLines->Clear();
+
+ Int_t nolines = FindTracklets(evnumber,0);
+ fCurrentVertex = 0;
+ if(nolines<2)return fCurrentVertex;
+ Int_t rc=Prepare3DVertex();
+ if(rc==0)Find3DVertex();
+ if(fVert3D){
+ if(fLines) fLines->Delete();
+ nolines = FindTracklets(evnumber,1);
+ if(nolines<2)return fCurrentVertex;
+ rc=Prepare3DVertex();
+ if(rc==0)Find3DVertex();
+ }
+
+ if(fVert3D){
+ fCurrentVertex = new AliESDVertex();
+ fCurrentVertex->SetTitle("vertexer: 3D");
+ fCurrentVertex->SetName("Vertex");
+ fCurrentVertex->SetXv(fVert3D->GetXv());
+ fCurrentVertex->SetYv(fVert3D->GetYv());
+ fCurrentVertex->SetZv(fVert3D->GetZv());
+ fCurrentVertex->SetDispersion(fVert3D->GetDispersion());
+ fCurrentVertex->SetNContributors(fVert3D->GetNContributors());
+ }
+ FindMultiplicity(evnumber);
+ return fCurrentVertex;
+}
+
+//______________________________________________________________________
+Int_t AliITSVertexer3D::FindTracklets(Int_t evnumber, Int_t optCuts){
+ // All the possible combinations between recpoints on layer 1and 2 are
+ // considered. Straight lines (=tracklets)are formed.
+ // The tracklets are processed in Prepare3DVertex
+ AliRunLoader *rl =AliRunLoader::GetRunLoader();
+ AliITSLoader* itsLoader = (AliITSLoader*)rl->GetLoader("ITSLoader");
+ AliITSgeom* geom = itsLoader->GetITSgeom();
+ itsLoader->LoadRecPoints();
+ rl->GetEvent(evnumber);
+
+ AliITSDetTypeRec detTypeRec;
+
+ TTree *tR = itsLoader->TreeR();
+ detTypeRec.SetTreeAddressR(tR);
+ TClonesArray *itsRec = 0;
+ // lc and gc are local and global coordinates for layer 1
+ Float_t lc[3]; for(Int_t ii=0; ii<3; ii++) lc[ii]=0.;
+ Float_t gc[3]; for(Int_t ii=0; ii<3; ii++) gc[ii]=0.;
+ // lc2 and gc2 are local and global coordinates for layer 2
+ Float_t lc2[3]; for(Int_t ii=0; ii<3; ii++) lc2[ii]=0.;
+ Float_t gc2[3]; for(Int_t ii=0; ii<3; ii++) gc2[ii]=0.;
+
+ itsRec = detTypeRec.RecPoints();
+ TBranch *branch;
+ branch = tR->GetBranch("ITSRecPoints");
+
+ // Set values for cuts
+ Float_t xbeam=0., ybeam=0.;
+ Float_t deltaPhi=fCoarseDiffPhiCut;
+ if(optCuts){
+ xbeam=fVert3D->GetXv();
+ ybeam=fVert3D->GetYv();
+ deltaPhi = fDiffPhiMax;
+ }
+
+ Int_t nrpL1 = 0; // number of rec points on layer 1
+ Int_t nrpL2 = 0; // number of rec points on layer 2
+
+ // By default irstL1=0 and lastL1=79
+ Int_t irstL1 = geom->GetStartDet(0);
+ Int_t lastL1 = geom->GetModuleIndex(2,1,1)-1;
+ for(Int_t module= irstL1; module<=lastL1;module++){ // count number of recopints on layer 1
+ branch->GetEvent(module);
+ nrpL1+= itsRec->GetEntries();
+ detTypeRec.ResetRecPoints();
+ }
+ //By default irstL2=80 and lastL2=239
+ Int_t irstL2 = geom->GetModuleIndex(2,1,1);
+ Int_t lastL2 = geom->GetLastDet(0);
+ for(Int_t module= irstL2; module<=lastL2;module++){ // count number of recopints on layer 2
+ branch->GetEvent(module);
+ nrpL2+= itsRec->GetEntries();
+ detTypeRec.ResetRecPoints();
+ }
+ if(nrpL1 == 0 || nrpL2 == 0){
+ itsLoader->UnloadRecPoints();
+ return -1;
+ }
+ if(fDebug) printf("RecPoints on Layer 1,2 = %d, %d\n",nrpL1,nrpL2);
+
+ Double_t a[3]={xbeam,ybeam,0.};
+ Double_t b[3]={xbeam,ybeam,10.};
+ AliStrLine zeta(a,b,kTRUE);
+
+ Int_t nolines = 0;
+ // Loop on modules of layer 1
+ for(Int_t modul1= irstL1; modul1<=lastL1;modul1++){ // Loop on modules of layer 1
+ branch->GetEvent(modul1);
+ Int_t nrecp1 = itsRec->GetEntries();
+ TClonesArray *prpl1 = new TClonesArray("AliITSRecPoint",nrecp1);
+ prpl1->SetOwner();
+ TClonesArray &rpl1 = *prpl1;
+ for(Int_t j=0;j<nrecp1;j++){
+ AliITSRecPoint *recp = (AliITSRecPoint*)itsRec->At(j);
+ new(rpl1[j])AliITSRecPoint(*recp);
+ }
+ detTypeRec.ResetRecPoints();
+ for(Int_t j=0;j<nrecp1;j++){
+ AliITSRecPoint *recp = (AliITSRecPoint*)prpl1->At(j);
+ // Local coordinates of this recpoint
+ lc[0]=recp->GetDetLocalX();
+ lc[2]=recp->GetDetLocalZ();
+ geom->LtoG(modul1,lc,gc); // global coordinates
+ Double_t phi1 = TMath::ATan2(gc[1]-ybeam,gc[0]-xbeam);
+ if(phi1<0)phi1=2*TMath::Pi()+phi1;
+ for(Int_t modul2= irstL2; modul2<=lastL2;modul2++){
+ branch->GetEvent(modul2);
+ Int_t nrecp2 = itsRec->GetEntries();
+ for(Int_t j2=0;j2<nrecp2;j2++){
+ recp = (AliITSRecPoint*)itsRec->At(j2);
+ lc2[0]=recp->GetDetLocalX();
+ lc2[2]=recp->GetDetLocalZ();
+ geom->LtoG(modul2,lc2,gc2);
+ Double_t phi2 = TMath::ATan2(gc2[1]-ybeam,gc2[0]-xbeam);
+ if(phi2<0)phi2=2*TMath::Pi()+phi2;
+ Double_t diff = TMath::Abs(phi2-phi1);
+ if(diff>TMath::Pi())diff=2.*TMath::Pi()-diff;
+ if(diff>deltaPhi)continue;
+ AliStrLine line(gc,gc2,kTRUE);
+ Double_t cp[3];
+ Int_t retcode = line.Cross(&zeta,cp);
+ if(retcode<0)continue;
+ Double_t dca = line.GetDCA(&zeta);
+ if(dca<0.) continue;
+ if(dca>fMaxRCut)continue;
+ if(cp[2]>fZCutDiamond || cp[2]<-fZCutDiamond)continue;
+ MakeTracklet(gc,gc2,nolines);
+ }
+ detTypeRec.ResetRecPoints();
+ }
+ }
+ delete prpl1;
+ }
+ if(nolines == 0)return -2;
+ return nolines;
+}
+
+//______________________________________________________________________
+void AliITSVertexer3D::FindVertices(){
+ // computes the vertices of the events in the range FirstEvent - LastEvent
+ AliRunLoader *rl = AliRunLoader::GetRunLoader();
+ AliITSLoader* itsLoader = (AliITSLoader*) rl->GetLoader("ITSLoader");
+ itsLoader->ReloadRecPoints();
+ for(Int_t i=fFirstEvent;i<=fLastEvent;i++){
+ rl->GetEvent(i);
+ FindVertexForCurrentEvent(i);
+ if(fCurrentVertex){
+ WriteCurrentVertex();
+ }
+ }
+}
+
+
+//______________________________________________________________________
+void AliITSVertexer3D::Find3DVertex(){
+ // Determines the vertex position
+ // same algorithm as in AliVertexerTracks::StrLinVertexFinderMinDist(0)
+ // adapted to pure AliStrLine objects
+
+ Int_t knacc = fLines->GetEntriesFast();
+ 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; i<knacc; i++){
+ AliStrLine *line1 = (AliStrLine*)fLines->At(i);
+
+ 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];
+ AliVertexerTracks::GetStrLinDerivMatrix(p0,p1,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=AliVertexerTracks::GetDeterminant3X3(sum);
+ Double_t initPos[3];
+ Double_t sigma = 0.;
+ for(Int_t i=0;i<3;i++)initPos[i]=0.;
+
+ Int_t goodvert=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]=AliVertexerTracks::GetDeterminant3X3(vett)/det;
+ }
+
+ Double_t rvert=TMath::Sqrt(initPos[0]*initPos[0]+initPos[1]*initPos[1]);
+ Double_t zvert=initPos[2];
+ if(rvert<fMaxRCut && TMath::Abs(zvert)<fZCutDiamond){
+ 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+=AliVertexerTracks::GetStrLinMinDist(p0,p1,initPos);
+ }
+ sigma=TMath::Sqrt(sigma);
+ goodvert=1;
+ }
+ }
+ delete vectP0;
+ delete vectP1;
+ if(!goodvert){
+ Warning("Find3DVertex","Finder did not succed");
+ for(Int_t i=0;i<3;i++)initPos[i]=0.;
+ sigma=999;
+ knacc=-1;
+ }
+ if(fVert3D){
+ fVert3D-> SetXYZ(initPos);
+ fVert3D->SetDispersion(sigma);
+ fVert3D->SetNContributors(knacc);
+ }else{
+ fVert3D = new AliVertex(initPos,sigma,knacc);
+ }
+ if(fDebug) fVert3D->Print();
+}
+
+
+
+//______________________________________________________________________
+Int_t AliITSVertexer3D::Prepare3DVertex(){
+ // Finds the 3D vertex information using tracklets
+ Int_t retcode = -1;
+
+ Int_t nbr=50;
+ Float_t rl=-fMaxRCut;
+ Float_t rh=fMaxRCut;
+ Int_t nbz=100;
+ Float_t zl=-fZCutDiamond;
+ Float_t zh=fZCutDiamond;
+ Float_t binsizer=(rh-rl)/nbr;
+ Float_t binsizez=(zh-zl)/nbz;
+ TH3F *h3d = new TH3F("h3d","xyz distribution",nbr,rl,rh,nbr,rl,rh,nbz,zl,zh);
+
+
+ // cleanup of the TCLonesArray of tracklets (i.e. fakes are removed)
+ Int_t *validate = new Int_t [fLines->GetEntriesFast()];
+ for(Int_t i=0; i<fLines->GetEntriesFast();i++)validate[i]=0;
+ // Int_t itot=fLines->GetEntriesFast()-1-1;
+ for(Int_t i=0; i<fLines->GetEntriesFast()-1;i++){
+ //if(validate[i]==1)continue;
+ AliStrLine *l1 = (AliStrLine*)fLines->At(i);
+ for(Int_t j=i+1;j<fLines->GetEntriesFast();j++){
+ AliStrLine *l2 = (AliStrLine*)fLines->At(j);
+ if(l1->GetDCA(l2) > fDCAcut) continue;
+ Double_t point[3];
+ Int_t retc = l1->Cross(l2,point);
+ if(retc<0)continue;
+ Double_t rad=TMath::Sqrt(point[0]*point[0]+point[1]*point[1]);
+ if(TMath::Abs(point[2])>fZCutDiamond)continue;
+ if(rad>fMaxRCut)continue;
+ validate[i]++;
+ validate[j]++;
+ h3d->Fill(point[0],point[1],point[2]);
+ }
+ }
+
+
+
+ for(Int_t i=0; i<fLines->GetEntriesFast()-1;i++){ // remove tracklets sharing one recpoint
+ if(validate[i]==0)continue;
+ AliStrLine *l1 = (AliStrLine*)fLines->At(i);
+ for(Int_t j=i+1;j<fLines->GetEntriesFast();j++){
+ if(validate[j]==0)continue;
+ AliStrLine *l2 = (AliStrLine*)fLines->At(j);
+ if(l1->GetDCA(l2) > 0.00001) continue;
+ Double_t point[3];
+ Int_t retc = l1->Cross(l2,point);
+ if(retc<0)continue;
+ Double_t rad=TMath::Sqrt(point[0]*point[0]+point[1]*point[1]);
+ if(rad<fMaxRCut)continue;
+ validate[i]--;
+ validate[j]--;
+ }
+ }
+
+ Int_t numbtracklets=0;
+ for(Int_t i=0; i<fLines->GetEntriesFast();i++)if(validate[i]>=1)numbtracklets++;
+ if(numbtracklets<2){delete [] validate; delete h3d; return retcode; }
+
+ for(Int_t i=0; i<fLines->GetEntriesFast();i++){
+ if(validate[i]<1)fLines->RemoveAt(i);
+ }
+ fLines->Compress();
+ if (fDebug) cout<<"Number of tracklets (after compress) "<<fLines->GetEntriesFast()<<endl;
+ delete [] validate;
+
+
+ // finds region of origin"
+ Int_t nobi = 0;
+ Float_t cont = 0.;
+ Float_t cont2 = 0.;
+ TAxis *xax = h3d->GetXaxis();
+ TAxis *yax = h3d->GetYaxis();
+ TAxis *zax = h3d->GetZaxis();
+ for(Int_t i=xax->GetFirst();i<=xax->GetLast();i++){
+ for(Int_t j=yax->GetFirst();j<=yax->GetLast();j++){
+ for(Int_t k=zax->GetFirst();k<=zax->GetLast();k++){
+ nobi++;
+ cont+=h3d->GetBinContent(i,j,k);
+ cont2+=h3d->GetBinContent(i,j,k)*h3d->GetBinContent(i,j,k);
+ }
+ }
+ }
+ cont/=nobi;
+ cont2/=nobi;
+ cont2 = TMath::Sqrt((cont2 - cont*cont)/(nobi-1));
+ Double_t peak[3]={0.,0.,0.};
+ Float_t contref = 0.;
+ for(Int_t i=xax->GetFirst();i<=xax->GetLast();i++){
+ Float_t xval = xax->GetBinCenter(i);
+ for(Int_t j=yax->GetFirst();j<=yax->GetLast();j++){
+ Float_t yval = yax->GetBinCenter(j);
+ for(Int_t k=zax->GetFirst();k<=zax->GetLast();k++){
+ Float_t bc = h3d->GetBinContent(i,j,k);
+ Float_t zval = zax->GetBinCenter(k);
+ if(bc>contref){
+ contref = bc;
+ peak[2] = zval;
+ peak[1] = yval;
+ peak[0] = xval;
+ }
+ }
+ }
+ }
+ delete h3d;
+
+ // Second selection loop
+ Float_t bs=(binsizer+binsizez)/2.;
+ for(Int_t i=0; i<fLines->GetEntriesFast()-1;i++){
+ AliStrLine *l1 = (AliStrLine*)fLines->At(i);
+ if(l1->GetDistFromPoint(peak)>2.5*bs)fLines->RemoveAt(i);
+ }
+ fLines->Compress();
+ if (fDebug) cout<<"Number of tracklets (after 2nd compression) "<<fLines->GetEntriesFast()<<endl;
+
+
+ if(fLines->GetEntriesFast()>1){
+ Find3DVertex(); // find a first candidate for the primary vertex
+ // make a further selection on tracklets based on this first candidate
+ fVert3D->GetXYZ(peak);
+ if (fDebug) cout<<"FIRST V candidate: "<<peak[0]<<"; "<<peak[1]<<"; "<<peak[2]<<endl;
+ for(Int_t i=0; i<fLines->GetEntriesFast()-1;i++){
+ AliStrLine *l1 = (AliStrLine*)fLines->At(i);
+ if(l1->GetDistFromPoint(peak)> fDCAcut)fLines->RemoveAt(i);
+ }
+ fLines->Compress();
+ if (fDebug) cout<<"Number of tracklets (after 3rd compression) "<<fLines->GetEntriesFast()<<endl;
+ if(fLines->GetEntriesFast()>1){
+ retcode = 0; // this last tracklet selection will be used
+ delete fVert3D;
+ fVert3D = 0;
+ }
+ else {
+ retcode =1; // the previous tracklet selection will be used
+ }
+ }
+ else {
+ retcode = 0;
+ }
+ return retcode;
+}
+
+ //______________________________________________________________________
+void AliITSVertexer3D::MakeTracklet(Double_t *pA, Double_t *pB, Int_t &nolines) {
+ // makes a tracklet
+ TClonesArray &lines = *fLines;
+ if(nolines == 0){
+ if(fLines->GetEntriesFast()>0)fLines->Clear();
+ }
+ if(fLines->GetEntriesFast()==fLines->GetSize()){
+ Int_t newsize=(Int_t) 1.5*fLines->GetEntriesFast();
+ fLines->Expand(newsize);
+ }
+
+ new(lines[nolines++])AliStrLine(pA,pB,kTRUE);
+}
+
+ //______________________________________________________________________
+void AliITSVertexer3D::MakeTracklet(Float_t *pA, Float_t *pB, Int_t &nolines) {// Makes a tracklet
+ //
+ Double_t a[3],b[3];
+ for(Int_t i=0;i<3;i++){
+ a[i] = pA[i];
+ b[i] = pB[i];
+ }
+ MakeTracklet(a,b,nolines);
+}
+
+//________________________________________________________
+void AliITSVertexer3D::PrintStatus() const {
+ // Print current status
+ cout <<"=======================================================\n";
+ cout << "Loose cut on Delta Phi "<<fCoarseDiffPhiCut<<endl;
+ cout << "Cut on tracklet DCA to Z axis "<<fMaxRCut<<endl;
+ cout << "Cut on diamond (Z) "<<fZCutDiamond<<endl;
+ cout << "Cut on DCA - tracklet to tracklet and to vertex "<<fDCAcut<<endl;
+ cout <<" Max Phi difference: "<<fDiffPhiMax<<endl;
+
+
+ cout <<"=======================================================\n";
+}
git://git.uio.no / u / mrichter / AliRoot.git / commitdiff