1 /**************************************************************************
2 * Copyright(c) 2006-2008, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
16 #include "AliRunLoader.h"
17 #include "AliESDVertex.h"
19 #include "AliStrLine.h"
20 #include "AliTracker.h"
21 #include "AliITSDetTypeRec.h"
22 #include "AliITSRecPoint.h"
23 #include "AliITSRecPointContainer.h"
24 #include "AliITSgeomTGeo.h"
25 #include "AliVertexerTracks.h"
26 #include "AliITSVertexer3D.h"
27 #include "AliITSVertexerZ.h"
28 #include "AliITSSortTrkl.h"
29 /////////////////////////////////////////////////////////////////
30 // this class implements a method to determine
31 // the 3 coordinates of the primary vertex
34 ////////////////////////////////////////////////////////////////
36 const Int_t AliITSVertexer3D::fgkMaxNumOfClDefault = 300;
37 const Int_t AliITSVertexer3D::fgkMaxNumOfClRebinDefault = 500;
38 const Int_t AliITSVertexer3D::fgkMaxNumOfClDownscaleDefault = 1000;
39 const Float_t AliITSVertexer3D::fgk3DBinSizeDefault = 0.1;
41 ClassImp(AliITSVertexer3D)
45 //______________________________________________________________________
46 AliITSVertexer3D::AliITSVertexer3D(Double_t zcut):
48 fLines("AliStrLine",1000),
50 fCoarseDiffPhiCut(0.),
62 fUsedCluster(kMaxCluPerMod*kNSPDMod),
65 fDiffPhiforPileup(0.),
69 fMaxNumOfCl(fgkMaxNumOfClDefault),
70 fMaxNumOfClForRebin(fgkMaxNumOfClRebinDefault),
71 fMaxNumOfClForDownScale(fgkMaxNumOfClDownscaleDefault),
74 f3DBinSize(fgk3DBinSizeDefault),
76 fGenerForDownScale(0),
79 fSwitchAlgorithm(kFALSE)
81 // Default constructor
82 SetCoarseDiffPhiCut();
100 SetDeltaPhiforPileup();
104 fGenerForDownScale=new TRandom3(987654321);
107 //______________________________________________________________________
108 AliITSVertexer3D::AliITSVertexer3D(TRootIOCtor*):
110 fLines("AliStrLine",1000),
112 fCoarseDiffPhiCut(0.),
124 fUsedCluster(kMaxCluPerMod*kNSPDMod),
127 fDiffPhiforPileup(0.),
131 fMaxNumOfCl(fgkMaxNumOfClDefault),
132 fMaxNumOfClForRebin(fgkMaxNumOfClRebinDefault),
133 fMaxNumOfClForDownScale(fgkMaxNumOfClDownscaleDefault),
136 f3DBinSize(fgk3DBinSizeDefault),
137 fDoDownScale(kFALSE),
138 fGenerForDownScale(0),
141 fSwitchAlgorithm(kFALSE)
148 //______________________________________________________________________
149 AliITSVertexer3D::~AliITSVertexer3D() {
152 if(fZHisto) delete fZHisto;
153 if(fGenerForDownScale) delete fGenerForDownScale;
156 //______________________________________________________________________
157 void AliITSVertexer3D::ResetVert3D(){
158 // Reset the fVert3D object and reset the used clusters
163 fVert3D.SetDispersion(0.);
164 fVert3D.SetNContributors(0);
165 fUsedCluster.ResetAllBits(0);
167 //______________________________________________________________________
168 AliESDVertex* AliITSVertexer3D::FindVertexForCurrentEvent(TTree *itsClusterTree){
169 // Defines the AliESDVertex for the current event
171 AliDebug(1,"FindVertexForCurrentEvent - 3D - PROCESSING NEXT EVENT");
173 fCurrentVertex = NULL;
175 Int_t nolines = FindTracklets(itsClusterTree,0);
178 if(fSwitchAlgorithm) {
179 rc = Prepare3DVertexPbPb();
180 FindVertex3D(itsClusterTree);
182 rc=Prepare3DVertex(0);
183 if(fVert3D.GetNContributors()>0){
185 nolines = FindTracklets(itsClusterTree,1);
187 rc=Prepare3DVertex(1);
188 if(fPileupAlgo == 2 && rc == 0) FindVertex3DIterative();
189 else if(fPileupAlgo!=2 && rc == 0) FindVertex3D(itsClusterTree);
190 if(rc!=0) fVert3D.SetNContributors(0); // exclude this vertex
197 AliITSVertexerZ vertz(GetNominalPos()[0],GetNominalPos()[1]);
198 vertz.SetDetTypeRec(GetDetTypeRec());
199 AliDebug(1,"Call Vertexer Z\n");
200 vertz.SetLowLimit(-fZCutDiamond);
201 vertz.SetHighLimit(fZCutDiamond);
202 AliESDVertex* vtxz = vertz.FindVertexForCurrentEvent(itsClusterTree);
204 Double_t position[3]={GetNominalPos()[0],GetNominalPos()[1],vtxz->GetZv()};
205 Double_t covmatrix[6];
206 vtxz->GetCovMatrix(covmatrix);
207 Double_t chi2=99999.;
208 Int_t nContr=vtxz->GetNContributors();
209 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
210 fCurrentVertex->SetDispersion(vtxz->GetDispersion());
211 fCurrentVertex->SetTitle("vertexer: Z");
212 fCurrentVertex->SetName("SPDVertexZ");
217 if(fComputeMultiplicity) FindMultiplicity(itsClusterTree);
218 return fCurrentVertex;
221 //______________________________________________________________________
222 void AliITSVertexer3D::FindVertex3D(TTree *itsClusterTree){
223 // Instantiates the fCurrentVertex object. calle by FindVertexForCurrenEvent
224 Double_t vRadius=TMath::Sqrt(fVert3D.GetXv()*fVert3D.GetXv()+fVert3D.GetYv()*fVert3D.GetYv());
225 if(vRadius<GetPipeRadius() && fVert3D.GetNContributors()>0){
226 Double_t position[3]={fVert3D.GetXv(),fVert3D.GetYv(),fVert3D.GetZv()};
227 Double_t covmatrix[6];
228 fVert3D.GetCovMatrix(covmatrix);
229 Double_t chi2=99999.;
230 Int_t nContr=fVert3D.GetNContributors();
231 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
232 fCurrentVertex->SetTitle("vertexer: 3D");
233 fCurrentVertex->SetName("SPDVertex3D");
234 fCurrentVertex->SetDispersion(fVert3D.GetDispersion());
238 case 0: PileupFromZ(); break;
239 case 1: FindOther3DVertices(itsClusterTree); break;
240 case 3: break; // no pileup algo
241 default: AliError("Wrong pileup algorithm"); break;
245 fVertArray = new AliESDVertex[1];
246 fVertArray[0]=(*fCurrentVertex);
251 //______________________________________________________________________
252 void AliITSVertexer3D::FindVertex3DIterative(){
253 // find vertex if fPileupAlgo == 2
255 Int_t nLines=fLines.GetEntriesFast();
256 Int_t maxPoints=nLines*(nLines-1)/2;
257 Double_t* xP=new Double_t[maxPoints];
258 Double_t* yP=new Double_t[maxPoints];
259 Double_t* zP=new Double_t[maxPoints];
260 Int_t* index1=new Int_t[maxPoints];
261 Int_t* index2=new Int_t[maxPoints];
262 Double_t xbeam=fVert3D.GetXv();
263 Double_t ybeam=fVert3D.GetYv();
266 for(Int_t ilin1=0; ilin1<nLines; ilin1++){
267 AliStrLine *l1 = (AliStrLine*)fLines.At(ilin1);
268 for(Int_t ilin2=ilin1+1; ilin2<nLines; ilin2++){
269 AliStrLine *l2 = (AliStrLine*)fLines.At(ilin2);
270 Double_t dca=l1->GetDCA(l2);
271 if(dca > fDCAcut || dca<0.00001) continue;
273 Int_t retc = l1->Cross(l2,point);
275 Double_t rad=TMath::Sqrt(point[0]*point[0]+point[1]*point[1]);
276 if(rad>fCoarseMaxRCut)continue;
277 Double_t distFromBeam=TMath::Sqrt((point[0]-xbeam)*(point[0]-xbeam)+(point[1]-ybeam)*(point[1]-ybeam));
278 if(distFromBeam>fMaxRCut2) continue;
282 index1[iPoint]=ilin1;
283 index2[iPoint]=ilin2;
287 Int_t npoints=iPoint++;
289 Short_t* mask=new Short_t[npoints];
290 for(Int_t ip=0;ip<npoints;ip++) mask[ip]=-1;
292 for(Int_t ip1=0;ip1<npoints;ip1++){
293 if(mask[ip1]==-1) mask[ip1]=index++;
294 for(Int_t ip2=ip1+1; ip2<npoints; ip2++){
295 if(mask[ip2]==mask[ip1] && mask[ip2]!=-1) continue;
296 Double_t dist2=(xP[ip1]-xP[ip2])*(xP[ip1]-xP[ip2]);
297 dist2+=(yP[ip1]-yP[ip2])*(yP[ip1]-yP[ip2]);
298 dist2+=(zP[ip1]-zP[ip2])*(zP[ip1]-zP[ip2]);
299 if(dist2<fCutOnPairs*fCutOnPairs){
300 if(mask[ip2]==-1) mask[ip2]=mask[ip1];
302 for(Int_t ip=0; ip<npoints;ip++){
303 if(mask[ip]==mask[ip2]) mask[ip]=mask[ip1];
311 // Count multiplicity of trackelts in clusters
312 UInt_t* isIndUsed=new UInt_t[index+1];
313 for(Int_t ind=0;ind<index+1;ind++) isIndUsed[ind]=0;
314 for(Int_t ip=0; ip<npoints;ip++){
319 // Count clusters/vertices and sort according to multiplicity
321 Int_t* sortedIndex=new Int_t[index+1];
322 for(Int_t ind1=0;ind1<index+1;ind1++){
323 if(isIndUsed[ind1]<=1) isIndUsed[ind1]=0;
326 if(ind1>0) cap=isIndUsed[sortedIndex[ind1-1]];
328 Int_t biggerindex=-1;
329 for(Int_t ind2=0;ind2<index+1;ind2++){
331 for(Int_t ind3=0; ind3<ind1; ind3++)
332 if(ind2==sortedIndex[ind3]) use=kFALSE;
333 if(use && isIndUsed[ind2]>bigger && isIndUsed[ind2]<=cap){
334 bigger=isIndUsed[ind2];
338 sortedIndex[ind1]=biggerindex;
340 AliDebug(3,Form("Number of clusters before merging = %d\n",nClusters));
342 // Assign lines to clusters/vertices and merge clusters which share 1 line
343 Int_t nClustersAfterMerge=nClusters;
344 Int_t* belongsTo=new Int_t[nLines];
345 for(Int_t ilin=0; ilin<nLines; ilin++) belongsTo[ilin]=-1;
346 for(Int_t iclu=0;iclu<nClusters;iclu++){
347 Int_t actualCluIndex=iclu;
348 for(Int_t ip=0; ip<npoints;ip++){
349 if(mask[ip]==sortedIndex[iclu]){
350 Int_t ind1=index1[ip];
351 if(belongsTo[ind1]==-1) belongsTo[ind1]=actualCluIndex;
352 else if(belongsTo[ind1]<actualCluIndex){
353 Int_t newCluIndex=belongsTo[ind1];
354 for(Int_t ilin=0; ilin<nLines; ilin++){
355 if(belongsTo[ilin]==actualCluIndex) belongsTo[ilin]=newCluIndex;
357 AliDebug(10,Form("Merged cluster %d with %d\n",actualCluIndex,newCluIndex));
358 actualCluIndex=newCluIndex;
359 nClustersAfterMerge--;
361 Int_t ind2=index2[ip];
362 if(belongsTo[ind2]==-1) belongsTo[ind2]=actualCluIndex;
363 else if(belongsTo[ind2]<actualCluIndex){
364 Int_t newCluIndex=belongsTo[ind2];
365 for(Int_t ilin=0; ilin<nLines; ilin++){
366 if(belongsTo[ilin]==actualCluIndex) belongsTo[ilin]=newCluIndex;
368 AliDebug(10,Form("Merged cluster %d with %d\n",actualCluIndex,newCluIndex));
369 actualCluIndex=newCluIndex;
370 nClustersAfterMerge--;
375 AliDebug(3,Form("Number of clusters after merging = %d\n",nClustersAfterMerge));
377 // Count lines associated to each cluster/vertex
378 UInt_t *cluSize=new UInt_t[nClusters];
379 for(Int_t iclu=0;iclu<nClusters;iclu++){
381 for(Int_t ilin=0; ilin<nLines; ilin++){
382 if(belongsTo[ilin]==iclu) cluSize[iclu]++;
386 // Count good vertices (>1 associated tracklet)
388 for(Int_t iclu=0;iclu<nClusters;iclu++){
389 AliDebug(3,Form("Vertex %d Size=%d\n",iclu,cluSize[iclu]));
390 if(cluSize[iclu]>1) nGoodVert++;
393 AliDebug(1,Form("Number of good vertices = %d\n",nGoodVert));
394 // Calculate vertex coordinates for each cluster
396 fVertArray = new AliESDVertex[nGoodVert];
398 for(Int_t iclu=0;iclu<nClusters;iclu++){
399 Int_t size=cluSize[iclu];
401 AliStrLine **arrlin = new AliStrLine*[size];
403 for(Int_t ilin=0; ilin<nLines; ilin++){
404 if(belongsTo[ilin]==iclu){
405 arrlin[nFilled++] = dynamic_cast<AliStrLine*>(fLines[ilin]);
408 AliDebug(3,Form("Vertex %d N associated tracklets = %d out of %d\n",iVert,size,nFilled));
410 fVertArray[iVert]=AliVertexerTracks::TrackletVertexFinder(arrlin,nFilled);
412 fVertArray[iVert].GetXYZ(peak);
413 AliStrLine **arrlin2 = new AliStrLine*[size];
415 for(Int_t i=0; i<nFilled;i++){
416 AliStrLine *l1 = arrlin[i];
417 if(l1->GetDistFromPoint(peak)< fDCAcut)
418 arrlin2[nFilled2++] = dynamic_cast<AliStrLine*>(l1);
421 AliDebug(3,Form("Vertex %d recalculated with %d tracklets\n",iVert,nFilled2));
422 fVertArray[iVert]=AliVertexerTracks::TrackletVertexFinder(arrlin2,nFilled2);
432 fNTrpuv = fVertArray[1].GetNContributors();
433 fZpuv = fVertArray[1].GetZv();
436 Double_t vRadius=TMath::Sqrt(fVertArray[0].GetXv()*fVertArray[0].GetXv()+fVertArray[0].GetYv()*fVertArray[0].GetYv());
437 if(vRadius<GetPipeRadius() && fVertArray[0].GetNContributors()>0){
438 Double_t position[3]={fVertArray[0].GetXv(),fVertArray[0].GetYv(),fVertArray[0].GetZv()};
439 Double_t covmatrix[6];
440 fVertArray[0].GetCovMatrix(covmatrix);
441 Double_t chi2=99999.;
442 Int_t nContr=fVertArray[0].GetNContributors();
443 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
444 fCurrentVertex->SetTitle("vertexer: 3D");
445 fCurrentVertex->SetName("SPDVertex3D");
446 fCurrentVertex->SetDispersion(fVertArray[0].GetDispersion());
454 delete [] sortedIndex;
461 //______________________________________________________________________
462 void AliITSVertexer3D::FindVertex3DIterativeMM(){
463 // Defines the AliESDVertex for the current event
464 Int_t numsor=fLines.GetEntriesFast()*(fLines.GetEntriesFast()-1)/2;
465 //cout<<"AliITSVertexer3D::FindVertexForCurentEvent: Number of tracklets selected for vertexing "<<fLines.GetEntriesFast()<<"; Number of pairs: "<<numsor<<endl;
466 AliITSSortTrkl srt(fLines,numsor,fCutOnPairs,fCoarseMaxRCut);
468 AliInfo(Form("Number of vertices: %d",srt.GetNumberOfClusters()));
470 fNoVertices = srt.GetNumberOfClusters();
471 //printf("fNoVertices = %d \n",fNoVertices);
473 fVertArray = new AliESDVertex[fNoVertices];
474 for(Int_t kk=0; kk<srt.GetNumberOfClusters(); kk++){
476 Int_t *labels = srt.GetTrackletsLab(kk,size);
478 Int_t *pairs = srt.GetClusters(kk);
479 Int_t nopai = srt.GetSizeOfCluster(kk);
480 cout<<"***** Vertex number "<<kk<<". Pairs: \n";
481 for(Int_t jj=0;jj<nopai;jj++){
482 cout<<pairs[jj]<<" - ";
483 if(jj>0 & jj%8==0)cout<<endl;
486 cout<<"***** Vertex number "<<kk<<". Labels: \n";
488 AliStrLine **tclo = new AliStrLine* [size];
489 for(Int_t jj=0;jj<size;jj++){
490 // cout<<labels[jj]<<" - ";
491 // if(jj>0 & jj%8==0)cout<<endl;
492 tclo[jj] = dynamic_cast<AliStrLine*>(fLines[labels[jj]]);
496 fVertArray[kk]=AliVertexerTracks::TrackletVertexFinder(tclo,size);
498 // fVertArray[kk].PrintStatus();
500 // at least one second vertex is present
502 fNTrpuv = fVertArray[kk].GetNContributors();
503 fZpuv = fVertArray[kk].GetZv();
506 Double_t vRadius=TMath::Sqrt(fVertArray[0].GetXv()*fVertArray[0].GetXv()+fVertArray[0].GetYv()*fVertArray[0].GetYv());
507 if(vRadius<GetPipeRadius() && fVertArray[0].GetNContributors()>0){
508 Double_t position[3]={fVertArray[0].GetXv(),fVertArray[0].GetYv(),fVertArray[0].GetZv()};
509 Double_t covmatrix[6];
510 fVertArray[0].GetCovMatrix(covmatrix);
511 Double_t chi2=99999.;
512 Int_t nContr=fVertArray[0].GetNContributors();
513 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
514 fCurrentVertex->SetTitle("vertexer: 3D");
515 fCurrentVertex->SetName("SPDVertex3D");
516 fCurrentVertex->SetDispersion(fVertArray[0].GetDispersion());
522 //______________________________________________________________________
523 Bool_t AliITSVertexer3D::DistBetweenVertices(AliESDVertex &a, AliESDVertex &b, Double_t test, Double_t &dist){
524 // method to compare the distance between vertices a and b with "test"
525 //it returns kTRUE is the distance is less or equal to test
526 dist = (a.GetX()-b.GetX()) * (a.GetX()-b.GetX());
527 dist += (a.GetY()-b.GetY()) * (a.GetY()-b.GetY());
528 dist += (a.GetZ()-b.GetZ()) * (a.GetZ()-b.GetZ());
529 dist = TMath::Sqrt(dist);
530 if(dist <= test)return kTRUE;
535 //______________________________________________________________________
536 Int_t AliITSVertexer3D::FindTracklets(TTree *itsClusterTree, Int_t optCuts){
537 // All the possible combinations between recpoints on layer 1and 2 are
538 // considered. Straight lines (=tracklets)are formed.
539 // The tracklets are processed in Prepare3DVertex
541 TClonesArray *itsRec = 0;
542 if(optCuts==0) fZHisto->Reset();
543 // gc1 are local and global coordinates for layer 1
544 Float_t gc1f[3]={0.,0.,0.};
545 Double_t gc1[3]={0.,0.,0.};
546 // gc2 are local and global coordinates for layer 2
547 Float_t gc2f[3]={0.,0.,0.};
548 Double_t gc2[3]={0.,0.,0.};
549 AliITSRecPointContainer* rpcont=AliITSRecPointContainer::Instance();
550 rpcont->FetchClusters(0,itsClusterTree);
551 if(!rpcont->IsSPDActive()){
552 AliWarning("No SPD rec points found, 3D vertex not calculated");
556 // Set values for cuts
557 Double_t xbeam=GetNominalPos()[0];
558 Double_t ybeam=GetNominalPos()[1];
560 Double_t deltaPhi=fCoarseDiffPhiCut;
561 Double_t deltaR=fCoarseMaxRCut;
562 Double_t dZmax=fZCutDiamond;
564 xbeam=fVert3D.GetXv();
565 ybeam=fVert3D.GetYv();
566 zvert=fVert3D.GetZv();
567 deltaPhi = fDiffPhiMax;
570 if(fPileupAlgo == 2){
574 } else if(optCuts==2){
575 xbeam=fVert3D.GetXv();
576 ybeam=fVert3D.GetYv();
577 deltaPhi = fDiffPhiforPileup;
581 fNRecPLay1=rpcont->GetNClustersInLayerFast(1);
582 fNRecPLay2=rpcont->GetNClustersInLayerFast(2);
583 if(fNRecPLay1 == 0 || fNRecPLay2 == 0){
584 AliDebug(1,Form("No RecPoints in at least one SPD layer (%d %d)",fNRecPLay1,fNRecPLay2));
587 AliDebug(1,Form("RecPoints on Layer 1,2 = %d, %d\n",fNRecPLay1,fNRecPLay2));
589 fSwitchAlgorithm=kFALSE;
591 Float_t factDownScal=1.;
592 Int_t origLaddersOnLayer2=fLadOnLay2;
594 switch(fHighMultAlgo){
596 if(fNRecPLay1>fMaxNumOfClForDownScale || fNRecPLay2>fMaxNumOfClForDownScale){
597 if(optCuts==2) return -1; // do not try to search for pileup
598 SetLaddersOnLayer2(2);
600 factDownScal=(Float_t)fMaxNumOfClForDownScale*(Float_t)fMaxNumOfClForDownScale/(Float_t)fNRecPLay1/(Float_t)fNRecPLay2;
602 factDownScal*=(fCoarseDiffPhiCut/fDiffPhiMax)*10;
605 SetLaddersOnLayer2(origLaddersOnLayer2);
608 if(fDoDownScale)AliDebug(1,Form("Too many recpoints on SPD(%d %d ), downscale by %f",fNRecPLay1,fNRecPLay2,factDownScal));
612 if(fNRecPLay1>fMaxNumOfCl || fNRecPLay2>fMaxNumOfCl) {
613 if(optCuts==2) return -1; // do not try to search for pileup
614 fSwitchAlgorithm=kTRUE;
617 default: break; // no pileup algo
620 if(!fDoDownScale && !fSwitchAlgorithm){
621 if(fNRecPLay1>fMaxNumOfClForRebin || fNRecPLay2>fMaxNumOfClForRebin){
622 SetLaddersOnLayer2(2);
626 Double_t a[3]={xbeam,ybeam,0.};
627 Double_t b[3]={xbeam,ybeam,10.};
628 AliStrLine zeta(a,b,kTRUE);
629 static Double_t bField=TMath::Abs(AliTracker::GetBz()/10.); //T
630 SetMeanPPtSelTracks(bField);
633 // Loop on modules of layer 1
634 Int_t firstL1 = TMath::Max(0,AliITSgeomTGeo::GetModuleIndex(1,1,1));
635 Int_t lastL1 = AliITSgeomTGeo::GetModuleIndex(2,1,1)-1;
636 for(Int_t modul1= firstL1; modul1<=lastL1;modul1++){ // Loop on modules of layer 1
637 if(!fUseModule[modul1]) continue;
639 UShort_t ladder=modul1/4+1; // ladders are numbered starting from 1
640 TClonesArray *prpl1=rpcont->UncheckedGetClusters(modul1);
641 Int_t nrecp1 = prpl1->GetEntries();
642 for(Int_t j=0;j<nrecp1;j++){
643 if(j>kMaxCluPerMod) continue;
644 UShort_t idClu1=modul1*kMaxCluPerMod+j;
645 if(fUsedCluster.TestBitNumber(idClu1)) continue;
646 if(fDoDownScale && !fSwitchAlgorithm){
647 if(fGenerForDownScale->Rndm()>factDownScal) continue;
649 AliITSRecPoint *recp1 = (AliITSRecPoint*)prpl1->At(j);
650 recp1->GetGlobalXYZ(gc1f);
651 for(Int_t ico=0;ico<3;ico++)gc1[ico]=gc1f[ico];
653 Double_t phi1 = TMath::ATan2(gc1[1]-ybeam,gc1[0]-xbeam);
654 if(phi1<0)phi1=2*TMath::Pi()+phi1;
655 for(Int_t ladl2=0 ; ladl2<fLadOnLay2*2+1;ladl2++){
656 for(Int_t k=0;k<4;k++){
657 Int_t ladmod=fLadders[ladder-1]+ladl2;
658 if(ladmod>AliITSgeomTGeo::GetNLadders(2)) ladmod=ladmod-AliITSgeomTGeo::GetNLadders(2);
659 Int_t modul2=AliITSgeomTGeo::GetModuleIndex(2,ladmod,k+1);
660 if(modul2<0)continue;
661 if(!fUseModule[modul2]) continue;
662 itsRec=rpcont->UncheckedGetClusters(modul2);
663 Int_t nrecp2 = itsRec->GetEntries();
664 for(Int_t j2=0;j2<nrecp2;j2++){
665 if(j2>kMaxCluPerMod) continue;
666 UShort_t idClu2=modul2*kMaxCluPerMod+j2;
667 if(fUsedCluster.TestBitNumber(idClu2)) continue;
669 AliITSRecPoint *recp2 = (AliITSRecPoint*)itsRec->At(j2);
670 recp2->GetGlobalXYZ(gc2f);
671 for(Int_t ico=0;ico<3;ico++)gc2[ico]=gc2f[ico];
672 Double_t phi2 = TMath::ATan2(gc2[1]-ybeam,gc2[0]-xbeam);
673 if(phi2<0)phi2=2*TMath::Pi()+phi2;
674 Double_t diff = TMath::Abs(phi2-phi1);
675 if(diff>TMath::Pi())diff=2.*TMath::Pi()-diff;
676 if(optCuts==0 && diff<fDiffPhiforPileup){
677 Double_t r1=TMath::Sqrt(gc1[0]*gc1[0]+gc1[1]*gc1[1]);
679 Double_t r2=TMath::Sqrt(gc2[0]*gc2[0]+gc2[1]*gc2[1]);
681 Double_t zr0=(r2*zc1-r1*zc2)/(r2-r1); //Z @ null radius
684 if(diff>deltaPhi)continue;
685 AliStrLine line(gc1,gc2,kTRUE);
687 Int_t retcode = line.Cross(&zeta,cp);
688 if(retcode<0)continue;
689 Double_t dca = line.GetDCA(&zeta);
691 if(dca>deltaR)continue;
692 Double_t deltaZ=cp[2]-zvert;
693 if(TMath::Abs(deltaZ)>dZmax)continue;
697 if(fLines.GetEntriesFast()>0)fLines.Clear("C");
700 recp2->GetGlobalCov(cov);
703 Double_t rad1=TMath::Sqrt(gc1[0]*gc1[0]+gc1[1]*gc1[1]);
704 Double_t rad2=TMath::Sqrt(gc2[0]*gc2[0]+gc2[1]*gc2[1]);
705 Double_t factor=(rad1+rad2)/(rad2-rad1); //factor to account for error on tracklet direction
709 Double_t curvRadius=fMeanPtSelTrk/(0.3*bField)*100; //cm
710 Double_t dRad=TMath::Sqrt((gc1[0]-gc2[0])*(gc1[0]-gc2[0])+(gc1[1]-gc2[1])*(gc1[1]-gc2[1]));
711 Double_t aux=dRad/2.+rad1;
712 curvErr=TMath::Sqrt(curvRadius*curvRadius-dRad*dRad/4.)-TMath::Sqrt(curvRadius*curvRadius-aux*aux); //cm
715 sigmasq[0]=(cov[0]+curvErr*curvErr/2.)*factor*factor;
716 sigmasq[1]=(cov[3]+curvErr*curvErr/2.)*factor*factor;
717 sigmasq[2]=cov[5]*factor*factor;
719 // Multiple scattering
720 Double_t pOverMass=fMeanPSelTrk/0.140;
721 Double_t beta2=pOverMass*pOverMass/(1+pOverMass*pOverMass);
722 Double_t p2=fMeanPSelTrk*fMeanPSelTrk;
723 Double_t rBP=GetPipeRadius();
724 Double_t dBP=0.08/35.3; // 800 um of Be
725 Double_t dL1=0.01; //approx. 1% of radiation length
726 Double_t theta2BP=14.1*14.1/(beta2*p2*1e6)*dBP;
727 Double_t theta2L1=14.1*14.1/(beta2*p2*1e6)*dL1;
728 Double_t rtantheta1=(rad2-rad1)*TMath::Tan(TMath::Sqrt(theta2L1));
729 Double_t rtanthetaBP=(rad1-rBP)*TMath::Tan(TMath::Sqrt(theta2BP));
730 for(Int_t ico=0; ico<3;ico++){
731 sigmasq[ico]+=rtantheta1*rtantheta1*factor*factor/3.;
732 sigmasq[ico]+=rtanthetaBP*rtanthetaBP*factor*factor/3.;
734 Double_t wmat[9]={1.,0.,0.,0.,1.,0.,0.,0.,1.};
735 if(sigmasq[0]!=0.) wmat[0]=1./sigmasq[0];
736 if(sigmasq[1]!=0.) wmat[4]=1./sigmasq[1];
737 if(sigmasq[2]!=0.) wmat[8]=1./sigmasq[2];
738 new(fLines[nolines++])AliStrLine(gc1,sigmasq,wmat,gc2,kTRUE,idClu1,idClu2);
746 SetLaddersOnLayer2(origLaddersOnLayer2);
748 if(nolines == 0)return -2;
752 //______________________________________________________________________
753 Int_t AliITSVertexer3D::Prepare3DVertex(Int_t optCuts){
754 // Finds the 3D vertex information using tracklets
756 Double_t xbeam=GetNominalPos()[0];
757 Double_t ybeam=GetNominalPos()[1];
759 Double_t deltaR=fCoarseMaxRCut;
760 Double_t dZmax=fZCutDiamond;
762 xbeam=fVert3D.GetXv();
763 ybeam=fVert3D.GetYv();
764 zvert=fVert3D.GetZv();
767 if(fPileupAlgo == 2){
771 }else if(optCuts==2){
772 xbeam=fVert3D.GetXv();
773 ybeam=fVert3D.GetYv();
777 Double_t origBinSizeR=fBinSizeR;
778 Double_t origBinSizeZ=fBinSizeZ;
779 Bool_t rebinned=kFALSE;
785 if(optCuts==0 && (fNRecPLay1>fMaxNumOfClForRebin || fNRecPLay2>fMaxNumOfClForRebin)){
791 Double_t rl=-fCoarseMaxRCut;
792 Double_t rh=fCoarseMaxRCut;
793 Double_t zl=-fZCutDiamond;
794 Double_t zh=fZCutDiamond;
795 Int_t nbr=(Int_t)((rh-rl)/fBinSizeR+0.0001);
796 Int_t nbz=(Int_t)((zh-zl)/fBinSizeZ+0.0001);
797 Int_t nbrcs=(Int_t)((rh-rl)/(fBinSizeR*2.)+0.0001);
798 Int_t nbzcs=(Int_t)((zh-zl)/(fBinSizeZ*2.)+0.0001);
800 TH3F *h3d = new TH3F("h3d","xyz distribution",nbr,rl,rh,nbr,rl,rh,nbz,zl,zh);
801 TH3F *h3dcs = new TH3F("h3dcs","xyz distribution",nbrcs,rl,rh,nbrcs,rl,rh,nbzcs,zl,zh);
803 // cleanup of the TCLonesArray of tracklets (i.e. fakes are removed)
804 Int_t vsiz = fLines.GetEntriesFast();
805 Int_t *validate = new Int_t [vsiz];
806 for(Int_t i=0; i<vsiz;i++)validate[i]=0;
807 for(Int_t i=0; i<vsiz-1;i++){
808 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
809 for(Int_t j=i+1;j<fLines.GetEntriesFast();j++){
810 AliStrLine *l2 = (AliStrLine*)fLines.At(j);
811 Double_t dca=l1->GetDCA(l2);
812 if(dca > fDCAcut || dca<0.00001) continue;
814 Int_t retc = l1->Cross(l2,point);
816 Double_t deltaZ=point[2]-zvert;
817 if(TMath::Abs(deltaZ)>dZmax)continue;
818 Double_t rad=TMath::Sqrt(point[0]*point[0]+point[1]*point[1]);
819 if(rad>fCoarseMaxRCut)continue;
820 Double_t deltaX=point[0]-xbeam;
821 Double_t deltaY=point[1]-ybeam;
822 Double_t raddist=TMath::Sqrt(deltaX*deltaX+deltaY*deltaY);
823 if(raddist>deltaR)continue;
826 h3d->Fill(point[0],point[1],point[2]);
827 h3dcs->Fill(point[0],point[1],point[2]);
831 Int_t numbtracklets=0;
832 for(Int_t i=0; i<vsiz;i++)if(validate[i]>=1)numbtracklets++;
837 SetBinSizeR(origBinSizeR);
838 SetBinSizeZ(origBinSizeZ);
842 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
843 if(validate[i]<1)fLines.RemoveAt(i);
846 AliDebug(1,Form("Number of tracklets (after compress)%d ",fLines.GetEntriesFast()));
849 // Exit here if Pileup Algorithm 2 has been chosen during second loop
850 if(fPileupAlgo == 2 && optCuts==1){
853 SetBinSizeR(origBinSizeR);
854 SetBinSizeZ(origBinSizeZ);
858 // Find peaks in histos
860 Double_t peak[3]={0.,0.,0.};
862 FindPeaks(h3d,peak,ntrkl,ntimes);
864 Double_t binsizer=(rh-rl)/nbr;
865 Double_t binsizez=(zh-zl)/nbz;
866 if(optCuts==0 && (ntrkl<=2 || ntimes>1)){
869 FindPeaks(h3dcs,peak,ntrkl,ntimes);
870 binsizer=(rh-rl)/nbrcs;
871 binsizez=(zh-zl)/nbzcs;
872 if(ntrkl==1 || ntimes>1){
874 SetBinSizeR(origBinSizeR);
875 SetBinSizeZ(origBinSizeZ);
881 Double_t bs=(binsizer+binsizez)/2.;
882 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
883 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
884 if(l1->GetDistFromPoint(peak)>2.5*bs)fLines.RemoveAt(i);
887 AliDebug(1,Form("Number of tracklets (after 2nd compression) %d",fLines.GetEntriesFast()));
889 // Finer Histo in limited range in case of high mult.
893 Double_t xl=peak[0]-0.3;
894 Double_t xh=peak[0]+0.3;
895 Double_t yl=peak[1]-0.3;
896 Double_t yh=peak[1]+0.3;
899 Int_t nbxfs=(Int_t)((xh-xl)/fBinSizeR+0.0001);
900 Int_t nbyfs=(Int_t)((yh-yl)/fBinSizeR+0.0001);
901 Int_t nbzfs=(Int_t)((zh-zl)/fBinSizeZ+0.0001);
903 TH3F *h3dfs = new TH3F("h3dfs","xyz distribution",nbxfs,xl,xh,nbyfs,yl,yh,nbzfs,zl,zh);
904 for(Int_t i=0; i<fLines.GetEntriesFast()-1;i++){
905 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
906 for(Int_t j=i+1;j<fLines.GetEntriesFast();j++){
907 AliStrLine *l2 = (AliStrLine*)fLines.At(j);
908 Double_t dca=l1->GetDCA(l2);
909 if(dca > fDCAcut || dca<0.00001) continue;
911 Int_t retc = l1->Cross(l2,point);
913 Double_t deltaZ=point[2]-zvert;
914 if(TMath::Abs(deltaZ)>dZmax)continue;
915 Double_t rad=TMath::Sqrt(point[0]*point[0]+point[1]*point[1]);
916 if(rad>fCoarseMaxRCut)continue;
917 Double_t deltaX=point[0]-xbeam;
918 Double_t deltaY=point[1]-ybeam;
919 Double_t raddist=TMath::Sqrt(deltaX*deltaX+deltaY*deltaY);
920 if(raddist>deltaR)continue;
921 h3dfs->Fill(point[0],point[1],point[2]);
927 Double_t newpeak[3]={0.,0.,0.};
928 FindPeaks(h3dfs,newpeak,ntrkl,ntimes);
930 for(Int_t iCoo=0; iCoo<3; iCoo++) peak[iCoo]=newpeak[iCoo];
935 bs=(binsizer+binsizez)/2.;
936 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
937 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
938 if(l1->GetDistFromPoint(peak)>2.5*bs)fLines.RemoveAt(i);
941 AliDebug(1,Form("Number of tracklets (after 3rd compression) %d",fLines.GetEntriesFast()));
943 SetBinSizeR(origBinSizeR);
944 SetBinSizeZ(origBinSizeZ);
947 // Second selection loop
950 if(fLines.GetEntriesFast()>1){
952 // find a first candidate for the primary vertex
953 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
954 // make a further selection on tracklets based on this first candidate
955 fVert3D.GetXYZ(peak);
956 AliDebug(1,Form("FIRST V candidate: %f ; %f ; %f",peak[0],peak[1],peak[2]));
957 Int_t *validate2 = new Int_t [fLines.GetEntriesFast()];
958 for(Int_t i=0; i<fLines.GetEntriesFast();i++) validate2[i]=1;
959 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
960 if(validate2[i]==0) continue;
961 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
962 if(l1->GetDistFromPoint(peak)> fDCAcut)fLines.RemoveAt(i);
963 if(optCuts==2){ // temporarily only for pileup
964 for(Int_t j=i+1; j<fLines.GetEntriesFast();j++){
965 AliStrLine *l2 = (AliStrLine*)fLines.At(j);
966 if(l1->GetDCA(l2)<0.00001){
967 Int_t delta1=(Int_t)l1->GetIdPoint(0)-(Int_t)l2->GetIdPoint(0);
968 Int_t delta2=(Int_t)l1->GetIdPoint(1)-(Int_t)l2->GetIdPoint(1);
969 Int_t deltamod1=(Int_t)l1->GetIdPoint(0)/kMaxCluPerMod
970 -(Int_t)l2->GetIdPoint(0)/kMaxCluPerMod;
971 Int_t deltamod2=(Int_t)l1->GetIdPoint(1)/kMaxCluPerMod
972 -(Int_t)l2->GetIdPoint(1)/kMaxCluPerMod;
973 // remove tracklets sharing a point
974 if( (delta1==0 && deltamod2==0) ||
975 (delta2==0 && deltamod1==0) ) validate2[j]=0;
980 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
981 if(validate2[i]==0) fLines.RemoveAt(i);
985 AliDebug(1,Form("Number of tracklets (after 3rd compression) %d",fLines.GetEntriesFast()));
986 if(fLines.GetEntriesFast()>1){// this new tracklet selection is used
987 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
993 //________________________________________________________
994 Int_t AliITSVertexer3D::Prepare3DVertexPbPb(){
995 // Finds the 3D vertex information in Pb-Pb events using tracklets
996 AliDebug(1,"High multiplicity event.\n");
998 Int_t nxy=(Int_t)(2.*fCoarseMaxRCut/f3DBinSize);
999 Double_t xymi= -nxy*f3DBinSize/2.;
1000 Double_t xyma= nxy*f3DBinSize/2.;
1001 Int_t nz=(Int_t)(2.*fZCutDiamond/f3DBinSize);
1002 Double_t zmi=-nz*f3DBinSize/2.;
1003 Double_t zma=nz*f3DBinSize/2.;
1004 Int_t nolines=fLines.GetEntriesFast();
1005 TH3F *h3dv = new TH3F("h3dv","3d tracklets",nxy,xymi,xyma,nxy,xymi,xyma,nz,zmi,zma);
1007 for(Int_t itra=0; itra<nolines; itra++){
1008 Double_t wei = GetFraction(itra);
1009 //printf("tracklet %d ) - weight %f \n",itra,wei);
1011 AliStrLine *str=(AliStrLine*)fLines.At(itra);
1013 if(str->GetParamAtRadius(fCoarseMaxRCut,t1,t2)){
1016 str->ComputePointAtT(t1,punt);
1017 h3dv->Fill(punt[0],punt[1],punt[2],wei);
1023 Int_t noftrk,noftim;
1024 FindPeaks(h3dv,f3DPeak,noftrk,noftim); // arg: histo3d, peak, # of contrib., # of other peak with same magnitude
1027 // Remove all the tracklets which are not passing near peak
1030 AliStrLine *str=(AliStrLine*)fLines.At(nolines);
1031 Double_t dist = str->GetDistFromPoint(f3DPeak);
1032 if(dist>(2.*f3DBinSize)) fLines.RemoveAt(nolines);
1035 nolines=fLines.GetEntriesFast();
1039 Int_t *validate2 = new Int_t [fLines.GetEntriesFast()];
1040 for(Int_t i=0; i<fLines.GetEntriesFast();i++) validate2[i]=1;
1041 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
1042 if(validate2[i]==0) continue;
1043 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
1044 if(l1->GetDistFromPoint(f3DPeak)> fDCAcut)fLines.RemoveAt(i);
1045 for(Int_t j=i+1; j<fLines.GetEntriesFast();j++){
1046 AliStrLine *l2 = (AliStrLine*)fLines.At(j);
1047 if(l1->GetDCA(l2)<0.00001){
1048 Int_t delta1=(Int_t)l1->GetIdPoint(0)-(Int_t)l2->GetIdPoint(0);
1049 Int_t delta2=(Int_t)l1->GetIdPoint(1)-(Int_t)l2->GetIdPoint(1);
1050 Int_t deltamod1=(Int_t)l1->GetIdPoint(0)/kMaxCluPerMod
1051 -(Int_t)l2->GetIdPoint(0)/kMaxCluPerMod;
1052 Int_t deltamod2=(Int_t)l1->GetIdPoint(1)/kMaxCluPerMod
1053 -(Int_t)l2->GetIdPoint(1)/kMaxCluPerMod;
1054 // remove tracklets sharing a point
1055 if( (delta1==0 && deltamod2==0) ||
1056 (delta2==0 && deltamod1==0) ) validate2[j]=0;
1061 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
1062 if(validate2[i]==0) fLines.RemoveAt(i);
1065 delete [] validate2;
1069 AliDebug(1,Form("Number of tracklets (after 3rd compression) %d",fLines.GetEntriesFast()));
1071 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
1072 fVert3D.GetXYZ(f3DPeak);
1077 //________________________________________________________
1078 void AliITSVertexer3D::SetMeanPPtSelTracks(Double_t fieldTesla){
1079 // Sets mean values of Pt based on the field
1080 // for P (used in multiple scattering) the most probable value is used
1081 if(TMath::Abs(fieldTesla-0.5)<0.01){
1082 SetMeanPSelTracks(0.375);
1083 SetMeanPtSelTracks(0.630);
1084 }else if(TMath::Abs(fieldTesla-0.4)<0.01){
1085 SetMeanPSelTracks(0.375);
1086 SetMeanPtSelTracks(0.580);
1087 }else if(TMath::Abs(fieldTesla-0.2)<0.01){
1088 SetMeanPSelTracks(0.375);
1089 SetMeanPtSelTracks(0.530);
1090 }else if(fieldTesla<0.00001){
1091 SetMeanPSelTracks(0.375);
1092 SetMeanPtSelTracks(0.230);
1094 SetMeanPSelTracks();
1095 SetMeanPtSelTracks();
1099 //________________________________________________________
1100 void AliITSVertexer3D::SetZCutDiamond(Double_t zcut){
1101 // The fiducial region along Z is set. The TH1 object pointed by
1102 // fZHisto is created
1103 if(TMath::AreEqualAbs(zcut,fZCutDiamond,1.e-10))return;
1105 if(fZHisto) delete fZHisto;
1106 Double_t binsize=0.02; // default 200 micron
1107 Int_t nbins=static_cast<Int_t>(1+2*fZCutDiamond/binsize);
1108 fZHisto=new TH1F("hz","",nbins,-fZCutDiamond,-fZCutDiamond+binsize*nbins);
1109 fZHisto->SetDirectory(0);
1112 //________________________________________________________
1113 void AliITSVertexer3D::FindPeaks(TH3F* histo, Double_t *peak, Int_t &nOfTracklets, Int_t &nOfTimes){
1114 // Finds bin with max contents in 3D histo of tracket intersections
1115 TAxis *xax = histo->GetXaxis();
1116 TAxis *yax = histo->GetYaxis();
1117 TAxis *zax = histo->GetZaxis();
1123 Int_t peakbin[3]={0,0,0};
1124 Int_t peak2bin[3]={-1,-1,-1};
1126 for(Int_t i=xax->GetFirst();i<=xax->GetLast();i++){
1127 Double_t xval = xax->GetBinCenter(i);
1128 for(Int_t j=yax->GetFirst();j<=yax->GetLast();j++){
1129 Double_t yval = yax->GetBinCenter(j);
1130 for(Int_t k=zax->GetFirst();k<=zax->GetLast();k++){
1131 Double_t zval = zax->GetBinCenter(k);
1132 Int_t bc =(Int_t)histo->GetBinContent(i,j,k);
1134 if(bc>nOfTracklets){
1147 }else if(bc==nOfTracklets){
1148 if(TMath::Abs(i-peakbin[0])<=1 && TMath::Abs(j-peakbin[1])<=1 && TMath::Abs(k-peakbin[2])<=1){
1161 if(peak2bin[0]>=-1 && bc2!=-1){ // two contiguous peak-cells with same contents
1162 peak[0]=0.5*(xax->GetBinCenter(peakbin[0])+xax->GetBinCenter(peak2bin[0]));
1163 peak[1]=0.5*(yax->GetBinCenter(peakbin[1])+yax->GetBinCenter(peak2bin[1]));
1164 peak[2]=0.5*(zax->GetBinCenter(peakbin[2])+zax->GetBinCenter(peak2bin[2]));
1169 //________________________________________________________
1170 void AliITSVertexer3D::MarkUsedClusters(){
1171 // Mark clusters of tracklets used in vertex claulation
1172 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
1173 AliStrLine *lin = (AliStrLine*)fLines.At(i);
1174 Int_t idClu1=lin->GetIdPoint(0);
1175 Int_t idClu2=lin->GetIdPoint(1);
1176 fUsedCluster.SetBitNumber(idClu1);
1177 fUsedCluster.SetBitNumber(idClu2);
1180 //________________________________________________________
1181 Int_t AliITSVertexer3D::RemoveTracklets(){
1182 // Remove trackelts close to first found vertex
1183 Double_t vert[3]={fVert3D.GetXv(),fVert3D.GetYv(),fVert3D.GetZv()};
1185 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
1186 AliStrLine *lin = (AliStrLine*)fLines.At(i);
1187 if(lin->GetDistFromPoint(vert)<fDCAforPileup){
1188 Int_t idClu1=lin->GetIdPoint(0);
1189 Int_t idClu2=lin->GetIdPoint(1);
1190 fUsedCluster.SetBitNumber(idClu1);
1191 fUsedCluster.SetBitNumber(idClu2);
1199 //________________________________________________________
1200 void AliITSVertexer3D::FindOther3DVertices(TTree *itsClusterTree){
1201 // pileup identification based on 3D vertexing with not used clusters
1203 fVertArray = new AliESDVertex[kMaxPileupVertices+1];
1204 fVertArray[0]=(*fCurrentVertex);
1206 for(Int_t iPilV=1; iPilV<=kMaxPileupVertices; iPilV++){
1209 Int_t nolines = FindTracklets(itsClusterTree,2);
1211 Int_t nr=RemoveTracklets();
1214 Int_t rc=Prepare3DVertex(2);
1216 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
1217 if(fVert3D.GetNContributors()>=fMinTrackletsForPilup){
1219 fVertArray[nFoundVert]=fVert3D;
1222 fZpuv=fVert3D.GetZv();
1223 fNTrpuv=fVert3D.GetNContributors();
1230 fNoVertices=nFoundVert;
1232 //______________________________________________________________________
1233 void AliITSVertexer3D::PileupFromZ(){
1234 // Calls the pileup algorithm of ALiITSVertexerZ
1235 Int_t binmin, binmax;
1236 Int_t nPeaks=AliITSVertexerZ::GetPeakRegion(fZHisto,binmin,binmax);
1237 if(nPeaks==2)AliWarning("2 peaks found");
1238 Int_t firstPeakCont=0;
1239 Double_t firstPeakPos=0.;
1240 for(Int_t i=binmin-1;i<=binmax+1;i++){
1241 firstPeakCont+=static_cast<Int_t>(fZHisto->GetBinContent(i));
1242 firstPeakPos+=fZHisto->GetBinContent(i)*fZHisto->GetBinCenter(i);
1244 if(firstPeakCont>0){
1245 firstPeakPos/=firstPeakCont;
1247 if(firstPeakCont>fMinTrackletsForPilup){
1249 ncontr2=AliITSVertexerZ::FindSecondPeak(fZHisto,binmin,binmax,secPeakPos);
1250 if(ncontr2>=fMinTrackletsForPilup){
1253 AliESDVertex secondVert(secPeakPos,0.1,ncontr2);
1254 fVertArray = new AliESDVertex[2];
1255 fVertArray[0]=(*fCurrentVertex);
1256 fVertArray[1]=secondVert;
1264 //________________________________________________________
1265 Double_t AliITSVertexer3D::GetFraction(Int_t itr) const {
1266 // this method is used to fill a 3D histogram representing
1267 // the trajectories of the candidate tracklets
1268 // The computed fraction is used as a weight at filling time
1269 AliStrLine *str = (AliStrLine*)fLines.At(itr);
1270 Double_t spigolo=10.;
1274 Double_t maxl=TMath::Sqrt(3.)*spigolo;
1275 // intersection with a plane normal to the X axis
1276 if(TMath::AreEqualAbs(cd[0],0.,1.e-9)){
1282 Double_t zc=cd[2]*par;
1283 Double_t yc=cd[1]*par;
1284 if((-spigolo<=yc && yc<=spigolo) && (-spigolo<=zc && zc<=spigolo))return TMath::Abs(par/maxl);
1285 // intersection with a plane normal to the Y axis
1286 if(TMath::AreEqualAbs(cd[1],0.,1.e-9)){
1293 Double_t xc=cd[0]*par;
1294 if((-spigolo<=xc && xc<=spigolo) && (-spigolo<=zc && zc<=spigolo))return TMath::Abs(par/maxl);
1295 // intersection with a plane normal to the Z axis
1296 if(TMath::AreEqualAbs(cd[2],0.,1.e-9)){
1304 if((-spigolo<=xc && xc<=spigolo) && (-spigolo<=yc && yc<=spigolo))return TMath::Abs(par/maxl);
1305 // control should never reach the following lines
1306 AliError(Form("anomalous tracklet direction for tracklet %d in fLines\n",itr));
1311 //________________________________________________________
1312 void AliITSVertexer3D::PrintStatus() const {
1313 // Print current status
1314 printf("========= First step selections =====================\n");
1315 printf("Cut on diamond (Z) %f\n",fZCutDiamond);
1316 printf("Loose cut on Delta Phi %f\n",fCoarseDiffPhiCut);
1317 printf("Loose cut on tracklet DCA to Z axis %f\n",fCoarseMaxRCut);
1318 printf("Cut on DCA - tracklet to tracklet and to vertex %f\n",fDCAcut);
1319 printf("========= Second step selections ====================\n");
1320 printf("Cut on tracklet-to-first-vertex Z distance %f\n",fMaxZCut);
1321 printf("Max Phi difference: %f\n",fDiffPhiMax);
1322 printf("Cut on tracklet DCA to beam axis %f\n",fMaxRCut);
1323 printf("Cut on tracklet DCA to beam axis (algo2) %f\n",fMaxRCut2);
1324 printf("========= Pileup selections =========================\n");
1325 printf("Pileup algo: %d\n",fPileupAlgo);
1326 printf("Min DCA to 1st vertex for pileup (algo 0 and 1): %f\n",fDCAforPileup);
1327 printf("Cut on distance between pair-vertices (algo 2): %f\n",fCutOnPairs);
1328 printf("Maximum number of clusters on L1 or L2 for downscale: %d\n",fMaxNumOfClForDownScale);
1329 printf("Maximum number of clusters on L1 or L2 for histo rebin: %d\n",fMaxNumOfClForRebin);
1330 printf("=======================================================\n");