// p-p collisions
////////////////////////////////////////////////////////////////
-const Int_t AliITSVertexer3D::fgkMaxNumOfClDefault = 1000;
+const Int_t AliITSVertexer3D::fgkMaxNumOfClDefault = 300;
+const Int_t AliITSVertexer3D::fgkMaxNumOfClRebinDefault = 500;
+const Int_t AliITSVertexer3D::fgkMaxNumOfClDownscaleDefault = 1000;
+const Float_t AliITSVertexer3D::fgk3DBinSizeDefault = 0.1;
ClassImp(AliITSVertexer3D)
fBinSizeZ(0.),
fPileupAlgo(0),
fMaxNumOfCl(fgkMaxNumOfClDefault),
+ fMaxNumOfClForRebin(fgkMaxNumOfClRebinDefault),
+ fMaxNumOfClForDownScale(fgkMaxNumOfClDownscaleDefault),
+ fNRecPLay1(0),
+ fNRecPLay2(0),
+ f3DBinSize(fgk3DBinSizeDefault),
fDoDownScale(kFALSE),
- fGenerForDownScale(0)
+ fGenerForDownScale(0),
+ f3DPeak(),
+ fHighMultAlgo(1),
+ fSwitchAlgorithm(kFALSE)
{
// Default constructor
SetCoarseDiffPhiCut();
Int_t nolines = FindTracklets(itsClusterTree,0);
Int_t rc;
if(nolines>=2){
- rc=Prepare3DVertex(0);
- if(fVert3D.GetNContributors()>0){
- fLines.Clear("C");
- nolines = FindTracklets(itsClusterTree,1);
- if(nolines>=2){
- rc=Prepare3DVertex(1);
- if(fPileupAlgo == 2 && rc == 0) FindVertex3DIterative();
- else if(fPileupAlgo!=2 && rc == 0) FindVertex3D(itsClusterTree);
- if(rc!=0) fVert3D.SetNContributors(0); // exclude this vertex
+ if(fSwitchAlgorithm) {
+ rc = Prepare3DVertexPbPb();
+ FindVertex3D(itsClusterTree);
+ } else {
+ rc=Prepare3DVertex(0);
+ if(fVert3D.GetNContributors()>0){
+ fLines.Clear("C");
+ nolines = FindTracklets(itsClusterTree,1);
+ if(nolines>=2){
+ rc=Prepare3DVertex(1);
+ if(fPileupAlgo == 2 && rc == 0) FindVertex3DIterative();
+ else if(fPileupAlgo!=2 && rc == 0) FindVertex3D(itsClusterTree);
+ if(rc!=0) fVert3D.SetNContributors(0); // exclude this vertex
+ }
}
}
}
TClonesArray *itsRec = 0;
if(optCuts==0) fZHisto->Reset();
- // gc1 are local and global coordinates for layer 1
+ // gc1 are local and global coordinates for layer 1
Float_t gc1f[3]={0.,0.,0.};
Double_t gc1[3]={0.,0.,0.};
// gc2 are local and global coordinates for layer 2
deltaR=fMaxRCut;
}
- Int_t nrpL1 = 0; // number of rec points on layer 1
- Int_t nrpL2 = 0; // number of rec points on layer 2
- nrpL1=rpcont->GetNClustersInLayerFast(1);
- nrpL2=rpcont->GetNClustersInLayerFast(2);
- if(nrpL1 == 0 || nrpL2 == 0){
- AliDebug(1,Form("No RecPoints in at least one SPD layer (%d %d)",nrpL1,nrpL2));
+ fNRecPLay1=rpcont->GetNClustersInLayerFast(1);
+ fNRecPLay2=rpcont->GetNClustersInLayerFast(2);
+ if(fNRecPLay1 == 0 || fNRecPLay2 == 0){
+ AliDebug(1,Form("No RecPoints in at least one SPD layer (%d %d)",fNRecPLay1,fNRecPLay2));
return -1;
}
- AliDebug(1,Form("RecPoints on Layer 1,2 = %d, %d\n",nrpL1,nrpL2));
+ AliDebug(1,Form("RecPoints on Layer 1,2 = %d, %d\n",fNRecPLay1,fNRecPLay2));
fDoDownScale=kFALSE;
+ fSwitchAlgorithm=kFALSE;
+
Float_t factDownScal=1.;
Int_t origLaddersOnLayer2=fLadOnLay2;
- if(nrpL1>fMaxNumOfCl || nrpL2>fMaxNumOfCl){
- SetLaddersOnLayer2(2);
- fDoDownScale=kTRUE;
- factDownScal=(Float_t)fMaxNumOfCl*(Float_t)fMaxNumOfCl/(Float_t)nrpL1/(Float_t)nrpL2;
- if(optCuts==1){
- factDownScal*=(fCoarseDiffPhiCut/fDiffPhiMax)*10;
- if(factDownScal>1.){
- fDoDownScale=kFALSE;
- SetLaddersOnLayer2(origLaddersOnLayer2);
+ switch(fHighMultAlgo){
+ case 0:
+ if(fNRecPLay1>fMaxNumOfClForDownScale || fNRecPLay2>fMaxNumOfClForDownScale){
+ if(optCuts==2) return -1; // do not try to search for pileup
+ SetLaddersOnLayer2(2);
+ fDoDownScale=kTRUE;
+ factDownScal=(Float_t)fMaxNumOfClForDownScale*(Float_t)fMaxNumOfClForDownScale/(Float_t)fNRecPLay1/(Float_t)fNRecPLay2;
+ if(optCuts==1){
+ factDownScal*=(fCoarseDiffPhiCut/fDiffPhiMax)*10;
+ if(factDownScal>1.){
+ fDoDownScale=kFALSE;
+ SetLaddersOnLayer2(origLaddersOnLayer2);
+ }
}
+ if(fDoDownScale)AliDebug(1,Form("Too many recpoints on SPD(%d %d ), downscale by %f",fNRecPLay1,fNRecPLay2,factDownScal));
+ }
+ break;
+ case 1:
+ if(fNRecPLay1>fMaxNumOfCl || fNRecPLay2>fMaxNumOfCl) {
+ if(optCuts==2) return -1; // do not try to search for pileup
+ fSwitchAlgorithm=kTRUE;
+ }
+ break;
+ default: break; // no pileup algo
+ }
+
+ if(!fDoDownScale && !fSwitchAlgorithm){
+ if(fNRecPLay1>fMaxNumOfClForRebin || fNRecPLay2>fMaxNumOfClForRebin){
+ SetLaddersOnLayer2(2);
}
- else if(optCuts==2) return -1;
- if(fDoDownScale)AliDebug(1,Form("Too many recpoints on SPD(%d %d ), downscale by %f",nrpL1,nrpL2,factDownScal));
}
Double_t a[3]={xbeam,ybeam,0.};
if(j>kMaxCluPerMod) continue;
UShort_t idClu1=modul1*kMaxCluPerMod+j;
if(fUsedCluster.TestBitNumber(idClu1)) continue;
- if(fDoDownScale && fGenerForDownScale->Rndm()>factDownScal) continue;
+ if(fDoDownScale && !fSwitchAlgorithm){
+ if(fGenerForDownScale->Rndm()>factDownScal) continue;
+ }
AliITSRecPoint *recp1 = (AliITSRecPoint*)prpl1->At(j);
recp1->GetGlobalXYZ(gc1f);
for(Int_t ico=0;ico<3;ico++)gc1[ico]=gc1f[ico];
}
}
- if(fDoDownScale){
- SetLaddersOnLayer2(origLaddersOnLayer2);
- }
-
+ SetLaddersOnLayer2(origLaddersOnLayer2);
if(nolines == 0)return -2;
return nolines;
Int_t AliITSVertexer3D::Prepare3DVertex(Int_t optCuts){
// Finds the 3D vertex information using tracklets
Int_t retcode = -1;
-
Double_t xbeam=GetNominalPos()[0];
Double_t ybeam=GetNominalPos()[1];
Double_t zvert=0.;
Double_t origBinSizeR=fBinSizeR;
Double_t origBinSizeZ=fBinSizeZ;
+ Bool_t rebinned=kFALSE;
if(fDoDownScale){
SetBinSizeR(0.05);
SetBinSizeZ(0.05);
+ rebinned=kTRUE;
+ }else{
+ if(optCuts==0 && (fNRecPLay1>fMaxNumOfClForRebin || fNRecPLay2>fMaxNumOfClForRebin)){
+ SetBinSizeR(0.1);
+ SetBinSizeZ(0.2);
+ rebinned=kTRUE;
+ }
}
-
Double_t rl=-fCoarseMaxRCut;
Double_t rh=fCoarseMaxRCut;
Double_t zl=-fZCutDiamond;
Int_t retc = l1->Cross(l2,point);
if(retc<0)continue;
Double_t deltaZ=point[2]-zvert;
- if(TMath::Abs(deltaZ)>dZmax)continue;
+ if(TMath::Abs(deltaZ)>dZmax)continue;
Double_t rad=TMath::Sqrt(point[0]*point[0]+point[1]*point[1]);
if(rad>fCoarseMaxRCut)continue;
Double_t deltaX=point[0]-xbeam;
}
}
-
-
Int_t numbtracklets=0;
for(Int_t i=0; i<vsiz;i++)if(validate[i]>=1)numbtracklets++;
if(numbtracklets<2){
delete [] validate;
delete h3d;
delete h3dcs;
+ SetBinSizeR(origBinSizeR);
+ SetBinSizeZ(origBinSizeZ);
return retcode;
}
if(fPileupAlgo == 2 && optCuts==1){
delete h3d;
delete h3dcs;
+ SetBinSizeR(origBinSizeR);
+ SetBinSizeZ(origBinSizeZ);
return 0;
}
FindPeaks(h3dcs,peak,ntrkl,ntimes);
binsizer=(rh-rl)/nbrcs;
binsizez=(zh-zl)/nbzcs;
- if(ntrkl==1 || ntimes>1){delete h3dcs; return retcode;}
+ if(ntrkl==1 || ntimes>1){
+ delete h3dcs;
+ SetBinSizeR(origBinSizeR);
+ SetBinSizeZ(origBinSizeZ);
+ return retcode;
+ }
}
delete h3dcs;
+ Double_t bs=(binsizer+binsizez)/2.;
+ for(Int_t i=0; i<fLines.GetEntriesFast();i++){
+ AliStrLine *l1 = (AliStrLine*)fLines.At(i);
+ if(l1->GetDistFromPoint(peak)>2.5*bs)fLines.RemoveAt(i);
+ }
+ fLines.Compress();
+ AliDebug(1,Form("Number of tracklets (after 2nd compression) %d",fLines.GetEntriesFast()));
+
// Finer Histo in limited range in case of high mult.
- if(fDoDownScale){
+ if(rebinned){
SetBinSizeR(0.01);
SetBinSizeZ(0.01);
Double_t xl=peak[0]-0.3;
AliStrLine *l1 = (AliStrLine*)fLines.At(i);
for(Int_t j=i+1;j<fLines.GetEntriesFast();j++){
AliStrLine *l2 = (AliStrLine*)fLines.At(j);
+ Double_t dca=l1->GetDCA(l2);
+ if(dca > fDCAcut || dca<0.00001) continue;
Double_t point[3];
Int_t retc = l1->Cross(l2,point);
if(retc<0)continue;
+ Double_t deltaZ=point[2]-zvert;
+ if(TMath::Abs(deltaZ)>dZmax)continue;
+ Double_t rad=TMath::Sqrt(point[0]*point[0]+point[1]*point[1]);
+ if(rad>fCoarseMaxRCut)continue;
+ Double_t deltaX=point[0]-xbeam;
+ Double_t deltaY=point[1]-ybeam;
+ Double_t raddist=TMath::Sqrt(deltaX*deltaX+deltaY*deltaY);
+ if(raddist>deltaR)continue;
h3dfs->Fill(point[0],point[1],point[2]);
}
}
binsizez=fBinSizeZ;
}
delete h3dfs;
- SetBinSizeR(origBinSizeR);
- SetBinSizeZ(origBinSizeZ);
+ bs=(binsizer+binsizez)/2.;
+ for(Int_t i=0; i<fLines.GetEntriesFast();i++){
+ AliStrLine *l1 = (AliStrLine*)fLines.At(i);
+ if(l1->GetDistFromPoint(peak)>2.5*bs)fLines.RemoveAt(i);
+ }
+ fLines.Compress();
+ AliDebug(1,Form("Number of tracklets (after 3rd compression) %d",fLines.GetEntriesFast()));
}
+ SetBinSizeR(origBinSizeR);
+ SetBinSizeZ(origBinSizeZ);
// Second selection loop
- Double_t bs=(binsizer+binsizez)/2.;
- for(Int_t i=0; i<fLines.GetEntriesFast();i++){
- AliStrLine *l1 = (AliStrLine*)fLines.At(i);
- if(l1->GetDistFromPoint(peak)>2.5*bs)fLines.RemoveAt(i);
- }
- fLines.Compress();
- AliDebug(1,Form("Number of tracklets (after 2nd compression) %d",fLines.GetEntriesFast()));
if(fLines.GetEntriesFast()>1){
retcode=0;
return retcode;
}
+//________________________________________________________
+Int_t AliITSVertexer3D::Prepare3DVertexPbPb(){
+ // Finds the 3D vertex information in Pb-Pb events using tracklets
+ AliDebug(1,"High multiplicity event.\n");
+
+ Int_t nxy=(Int_t)(2.*fCoarseMaxRCut/f3DBinSize);
+ Double_t xymi= -nxy*f3DBinSize/2.;
+ Double_t xyma= nxy*f3DBinSize/2.;
+ Int_t nz=(Int_t)(2.*fZCutDiamond/f3DBinSize);
+ Double_t zmi=-nz*f3DBinSize/2.;
+ Double_t zma=nz*f3DBinSize/2.;
+ Int_t nolines=fLines.GetEntriesFast();
+ TH3F *h3dv = new TH3F("h3dv","3d tracklets",nxy,xymi,xyma,nxy,xymi,xyma,nz,zmi,zma);
+
+ for(Int_t itra=0; itra<nolines; itra++){
+ Double_t wei = GetFraction(itra);
+ //printf("tracklet %d ) - weight %f \n",itra,wei);
+ if(wei>1.e-6){
+ AliStrLine *str=(AliStrLine*)fLines.At(itra);
+ Double_t t1,t2;
+ if(str->GetParamAtRadius(fCoarseMaxRCut,t1,t2)){
+ do{
+ Double_t punt[3];
+ str->ComputePointAtT(t1,punt);
+ h3dv->Fill(punt[0],punt[1],punt[2],wei);
+ t1+=f3DBinSize/3.;
+ } while(t1<t2);
+ }
+ }
+ }
+ Int_t noftrk,noftim;
+ FindPeaks(h3dv,f3DPeak,noftrk,noftim); // arg: histo3d, peak, # of contrib., # of other peak with same magnitude
+
+
+ // Remove all the tracklets which are not passing near peak
+
+ while(nolines--){
+ AliStrLine *str=(AliStrLine*)fLines.At(nolines);
+ Double_t dist = str->GetDistFromPoint(f3DPeak);
+ if(dist>(2.*f3DBinSize)) fLines.RemoveAt(nolines);
+ }
+ fLines.Compress();
+ nolines=fLines.GetEntriesFast();
+
+ delete h3dv;
+
+ Int_t *validate2 = new Int_t [fLines.GetEntriesFast()];
+ for(Int_t i=0; i<fLines.GetEntriesFast();i++) validate2[i]=1;
+ for(Int_t i=0; i<fLines.GetEntriesFast();i++){
+ if(validate2[i]==0) continue;
+ AliStrLine *l1 = (AliStrLine*)fLines.At(i);
+ if(l1->GetDistFromPoint(f3DPeak)> fDCAcut)fLines.RemoveAt(i);
+ for(Int_t j=i+1; j<fLines.GetEntriesFast();j++){
+ AliStrLine *l2 = (AliStrLine*)fLines.At(j);
+ if(l1->GetDCA(l2)<0.00001){
+ Int_t delta1=(Int_t)l1->GetIdPoint(0)-(Int_t)l2->GetIdPoint(0);
+ Int_t delta2=(Int_t)l1->GetIdPoint(1)-(Int_t)l2->GetIdPoint(1);
+ Int_t deltamod1=(Int_t)l1->GetIdPoint(0)/kMaxCluPerMod
+ -(Int_t)l2->GetIdPoint(0)/kMaxCluPerMod;
+ Int_t deltamod2=(Int_t)l1->GetIdPoint(1)/kMaxCluPerMod
+ -(Int_t)l2->GetIdPoint(1)/kMaxCluPerMod;
+ // remove tracklets sharing a point
+ if( (delta1==0 && deltamod2==0) ||
+ (delta2==0 && deltamod1==0) ) validate2[j]=0;
+
+ }
+ }
+ }
+ for(Int_t i=0; i<fLines.GetEntriesFast();i++){
+ if(validate2[i]==0) fLines.RemoveAt(i);
+ }
+
+ delete [] validate2;
+ fLines.Compress();
+
+
+ AliDebug(1,Form("Number of tracklets (after 3rd compression) %d",fLines.GetEntriesFast()));
+
+ fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
+ fVert3D.GetXYZ(f3DPeak);
+
+ return 0;
+}
+
//________________________________________________________
void AliITSVertexer3D::SetMeanPPtSelTracks(Double_t fieldTesla){
// Sets mean values of Pt based on the field
}
}
}
+
+//________________________________________________________
+Double_t AliITSVertexer3D::GetFraction(Int_t itr) const {
+ // this method is used to fill a 3D histogram representing
+ // the trajectories of the candidate tracklets
+ // The computed fraction is used as a weight at filling time
+ AliStrLine *str = (AliStrLine*)fLines.At(itr);
+ Double_t spigolo=10.;
+ Double_t cd[3];
+ str->GetCd(cd);
+ Double_t par=0.;
+ Double_t maxl=TMath::Sqrt(3.)*spigolo;
+ // intersection with a plane normal to the X axis
+ if(TMath::AreEqualAbs(cd[0],0.,1.e-9)){
+ par=1000000.;
+ }
+ else {
+ par=spigolo/cd[0];
+ }
+ Double_t zc=cd[2]*par;
+ Double_t yc=cd[1]*par;
+ if((-spigolo<=yc && yc<=spigolo) && (-spigolo<=zc && zc<=spigolo))return TMath::Abs(par/maxl);
+ // intersection with a plane normal to the Y axis
+ if(TMath::AreEqualAbs(cd[1],0.,1.e-9)){
+ par=1000000.;
+ }
+ else {
+ par=spigolo/cd[1];
+ }
+ zc=cd[2]*par;
+ Double_t xc=cd[0]*par;
+ if((-spigolo<=xc && xc<=spigolo) && (-spigolo<=zc && zc<=spigolo))return TMath::Abs(par/maxl);
+ // intersection with a plane normal to the Z axis
+ if(TMath::AreEqualAbs(cd[2],0.,1.e-9)){
+ par=1000000.;
+ }
+ else {
+ par=spigolo/cd[2];
+ }
+ yc=cd[1]*par;
+ xc=cd[0]*par;
+ if((-spigolo<=xc && xc<=spigolo) && (-spigolo<=yc && yc<=spigolo))return TMath::Abs(par/maxl);
+ // control should never reach the following lines
+ AliError(Form("anomalous tracklet direction for tracklet %d in fLines\n",itr));
+ str->PrintStatus();
+ return 0.;
+}
+
//________________________________________________________
void AliITSVertexer3D::PrintStatus() const {
// Print current status
printf("Pileup algo: %d\n",fPileupAlgo);
printf("Min DCA to 1st vertex for pileup (algo 0 and 1): %f\n",fDCAforPileup);
printf("Cut on distance between pair-vertices (algo 2): %f\n",fCutOnPairs);
- printf("Maximum number of clusters allowed on L1 or L2: %d\n",fMaxNumOfCl);
+ printf("Maximum number of clusters on L1 or L2 for downscale: %d\n",fMaxNumOfClForDownScale);
+ printf("Maximum number of clusters on L1 or L2 for histo rebin: %d\n",fMaxNumOfClForRebin);
printf("=======================================================\n");
}
void FindVertex3DIterativeMM();
void FindVertex3D(TTree *itsClusterTree);
AliESDVertex GetVertex3D() const {return fVert3D;}
+ // Double_t *Get3DPeak() {return f3DPeak;}
virtual void PrintStatus() const;
static Bool_t DistBetweenVertices(AliESDVertex &a, AliESDVertex &b, Double_t test, Double_t &dist);
void SetWideFiducialRegion(Double_t dz = 40.0, Double_t dr=2.5){
void SetPileupAlgo(UShort_t optalgo=1){fPileupAlgo=optalgo;}
void SetBinSizeR(Double_t siz=0.1){fBinSizeR=siz;}
void SetBinSizeZ(Double_t siz=0.8){fBinSizeZ=siz;}
- void SetMaxNumOfClusters(Int_t ncl){fMaxNumOfCl=ncl;}
- Int_t GetMaxNumOfClusters() const {return fMaxNumOfCl;}
+ void SetHighMultAlgo(UChar_t n){
+ if(n<2) fHighMultAlgo=n;
+ else AliError("Only algos 0 and 1 implemented");
+ }
+ void SetHighMultDownscalingAlgo(){fHighMultAlgo=0;}
+ void SetHighMultTracesAlgo(){fHighMultAlgo=1;}
+
+ void SetMaxNumOfClustersForHighMult(Int_t ncl){fMaxNumOfCl=ncl;}
+ void SetMaxNumOfClustersForDownScale(Int_t ncl){fMaxNumOfClForDownScale=ncl;}
+ void SetMaxNumOfClustersForRebin(Int_t ncl){fMaxNumOfClForRebin=ncl;}
+ Int_t GetMaxNumOfClustersForHighMult() const {return fMaxNumOfCl;}
+ Int_t GetMaxNumOfClustersForDownScale() const {return fMaxNumOfClForDownScale;}
+ Int_t GetMaxNumOfClustersForRebin() const {return fMaxNumOfClForRebin;}
protected:
AliITSVertexer3D(const AliITSVertexer3D& vtxr);
AliITSVertexer3D& operator=(const AliITSVertexer3D& /* vtxr */);
Int_t FindTracklets(TTree *itsClusterTree, Int_t optCuts);
Int_t Prepare3DVertex(Int_t optCuts);
+ Int_t Prepare3DVertexPbPb();
void ResetVert3D();
void FindPeaks(TH3F* histo, Double_t *peak, Int_t &nOfTracklets, Int_t &nOfTimes);
void PileupFromZ();
void MarkUsedClusters();
Int_t RemoveTracklets();
void FindOther3DVertices(TTree *itsClusterTree);
+ Double_t GetFraction(Int_t itr) const;
enum {kMaxCluPerMod=250};
enum {kMaxPileupVertices=10};
-
TClonesArray fLines; //! array of tracklets
AliESDVertex fVert3D; // 3D Vertex
Double_t fCoarseDiffPhiCut; // loose cut on DeltaPhi for RecPoint matching
UShort_t fPileupAlgo; // Algo for pileup identification
// 0->VertexerZ pileup algo
// 1->Unused RecPoints algo
- Int_t fMaxNumOfCl; // max number of clusters on L1 or L2
+ Int_t fMaxNumOfCl; // max n. of clusters on L1 or L2 for high mult definition
+ Int_t fMaxNumOfClForRebin; // max n. of clusters on L1 or L2 for rebin
+ Int_t fMaxNumOfClForDownScale; // max n. of clusters on L1 or L2 for downscale
+ Int_t fNRecPLay1; // number of rec ponts on SPD layer 1
+ Int_t fNRecPLay2; // number of rec ponts on SPD layer 2
+ Float_t f3DBinSize; // Size of the 3D bins
Bool_t fDoDownScale; // Control downscaling of tracklets in high mult
TRandom3 *fGenerForDownScale; // randomnumber generator fordownscaling
+ Double_t f3DPeak[3]; // TH3F peak coords
+ UChar_t fHighMultAlgo; // algorithm used for high mult. events
+ Bool_t fSwitchAlgorithm; // Switch between two algoritms in testing phase
- static const Int_t fgkMaxNumOfClDefault; // Default max number of clusters
+ static const Int_t fgkMaxNumOfClDefault; // Default max n. of clusters for downscale
+ static const Int_t fgkMaxNumOfClRebinDefault; // Default max n. of clusters for rebin
+ static const Int_t fgkMaxNumOfClDownscaleDefault; // Default max n. of clusters for rebin
+ static const Float_t fgk3DBinSizeDefault; // Default 3D bins size
- ClassDef(AliITSVertexer3D,14);
+ ClassDef(AliITSVertexer3D,15);
};
git://git.uio.no / u / mrichter / AliRoot.git / commitdiff