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 = 500;
38 ClassImp(AliITSVertexer3D)
42 //______________________________________________________________________
43 AliITSVertexer3D::AliITSVertexer3D():
45 fLines("AliStrLine",1000),
47 fCoarseDiffPhiCut(0.),
59 fUsedCluster(kMaxCluPerMod*kNSPDMod),
62 fDiffPhiforPileup(0.),
66 fMaxNumOfCl(fgkMaxNumOfClDefault)
68 // Default constructor
69 SetCoarseDiffPhiCut();
82 SetDeltaPhiforPileup();
86 Double_t binsize=0.02; // default 200 micron
87 Int_t nbins=static_cast<Int_t>(1+2*fZCutDiamond/binsize);
88 fZHisto=new TH1F("hz","",nbins,-fZCutDiamond,-fZCutDiamond+binsize*nbins);
91 //______________________________________________________________________
92 AliITSVertexer3D::~AliITSVertexer3D() {
95 if(fZHisto) delete fZHisto;
98 //______________________________________________________________________
99 void AliITSVertexer3D::ResetVert3D(){
105 fVert3D.SetDispersion(0.);
106 fVert3D.SetNContributors(0);
107 fUsedCluster.ResetAllBits(0);
109 //______________________________________________________________________
110 AliESDVertex* AliITSVertexer3D::FindVertexForCurrentEvent(TTree *itsClusterTree){
111 // Defines the AliESDVertex for the current event
113 AliDebug(1,"FindVertexForCurrentEvent - 3D - PROCESSING NEXT EVENT");
115 fCurrentVertex = NULL;
117 Int_t nolines = FindTracklets(itsClusterTree,0);
120 rc=Prepare3DVertex(0);
121 if(fVert3D.GetNContributors()>0){
123 nolines = FindTracklets(itsClusterTree,1);
125 rc=Prepare3DVertex(1);
126 if(fPileupAlgo == 2 && rc == 0) FindVertex3DIterative();
127 else if(fPileupAlgo<2 && rc == 0) FindVertex3D(itsClusterTree);
128 if(rc!=0) fVert3D.SetNContributors(0); // exclude this vertex
134 AliITSVertexerZ vertz(GetNominalPos()[0],GetNominalPos()[1]);
135 vertz.SetDetTypeRec(GetDetTypeRec());
136 AliDebug(1,"Call Vertexer Z\n");
137 vertz.SetLowLimit(-fZCutDiamond);
138 vertz.SetHighLimit(fZCutDiamond);
139 AliESDVertex* vtxz = vertz.FindVertexForCurrentEvent(itsClusterTree);
141 Double_t position[3]={GetNominalPos()[0],GetNominalPos()[1],vtxz->GetZv()};
142 Double_t covmatrix[6];
143 vtxz->GetCovMatrix(covmatrix);
144 Double_t chi2=99999.;
145 Int_t nContr=vtxz->GetNContributors();
146 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
147 fCurrentVertex->SetTitle("vertexer: Z");
148 fCurrentVertex->SetName("SPDVertexZ");
153 FindMultiplicity(itsClusterTree);
154 return fCurrentVertex;
157 //______________________________________________________________________
158 void AliITSVertexer3D::FindVertex3D(TTree *itsClusterTree){
160 Double_t vRadius=TMath::Sqrt(fVert3D.GetXv()*fVert3D.GetXv()+fVert3D.GetYv()*fVert3D.GetYv());
161 if(vRadius<GetPipeRadius() && fVert3D.GetNContributors()>0){
162 Double_t position[3]={fVert3D.GetXv(),fVert3D.GetYv(),fVert3D.GetZv()};
163 Double_t covmatrix[6];
164 fVert3D.GetCovMatrix(covmatrix);
165 Double_t chi2=99999.;
166 Int_t nContr=fVert3D.GetNContributors();
167 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
168 fCurrentVertex->SetTitle("vertexer: 3D");
169 fCurrentVertex->SetName("SPDVertex3D");
170 fCurrentVertex->SetDispersion(fVert3D.GetDispersion());
174 case 0: PileupFromZ(); break;
175 case 1: FindOther3DVertices(itsClusterTree); break;
176 default: AliError("Wrong pileup algorithm"); break;
179 fVertArray = new AliESDVertex[1];
180 fVertArray[0]=(*fCurrentVertex);
185 //______________________________________________________________________
186 void AliITSVertexer3D::FindVertex3DIterative(){
189 Int_t nLines=fLines.GetEntriesFast();
190 Int_t maxPoints=nLines*(nLines-1)/2;
191 Double_t* xP=new Double_t[maxPoints];
192 Double_t* yP=new Double_t[maxPoints];
193 Double_t* zP=new Double_t[maxPoints];
194 Int_t* index1=new Int_t[maxPoints];
195 Int_t* index2=new Int_t[maxPoints];
196 Double_t xbeam=fVert3D.GetXv();
197 Double_t ybeam=fVert3D.GetYv();
200 for(Int_t ilin1=0; ilin1<nLines; ilin1++){
201 AliStrLine *l1 = (AliStrLine*)fLines.At(ilin1);
202 for(Int_t ilin2=ilin1+1; ilin2<nLines; ilin2++){
203 AliStrLine *l2 = (AliStrLine*)fLines.At(ilin2);
204 Double_t dca=l1->GetDCA(l2);
205 if(dca > fDCAcut || dca<0.00001) continue;
207 Int_t retc = l1->Cross(l2,point);
209 Double_t rad=TMath::Sqrt(point[0]*point[0]+point[1]*point[1]);
210 if(rad>fCoarseMaxRCut)continue;
211 Double_t distFromBeam=TMath::Sqrt((point[0]-xbeam)*(point[0]-xbeam)+(point[1]-ybeam)*(point[1]-ybeam));
212 if(distFromBeam>fMaxRCut2) continue;
216 index1[iPoint]=ilin1;
217 index2[iPoint]=ilin2;
221 Int_t npoints=iPoint++;
223 Short_t* mask=new Short_t[npoints];
224 for(Int_t ip=0;ip<npoints;ip++) mask[ip]=-1;
226 for(Int_t ip1=0;ip1<npoints;ip1++){
227 if(mask[ip1]==-1) mask[ip1]=index++;
228 for(Int_t ip2=ip1+1; ip2<npoints; ip2++){
229 if(mask[ip2]==mask[ip1] && mask[ip2]!=-1) continue;
230 Double_t dist2=(xP[ip1]-xP[ip2])*(xP[ip1]-xP[ip2]);
231 dist2+=(yP[ip1]-yP[ip2])*(yP[ip1]-yP[ip2]);
232 dist2+=(zP[ip1]-zP[ip2])*(zP[ip1]-zP[ip2]);
233 if(dist2<fCutOnPairs*fCutOnPairs){
234 if(mask[ip2]==-1) mask[ip2]=mask[ip1];
236 for(Int_t ip=0; ip<npoints;ip++){
237 if(mask[ip]==mask[ip2]) mask[ip]=mask[ip1];
245 // Count multiplicity of trackelts in clusters
246 UInt_t* isIndUsed=new UInt_t[index+1];
247 for(Int_t ind=0;ind<index+1;ind++) isIndUsed[ind]=0;
248 for(Int_t ip=0; ip<npoints;ip++){
253 // Count clusters/vertices and sort according to multiplicity
255 Int_t* sortedIndex=new Int_t[index+1];
256 for(Int_t ind1=0;ind1<index+1;ind1++){
257 if(isIndUsed[ind1]<=1) isIndUsed[ind1]=0;
260 if(ind1>0) cap=isIndUsed[sortedIndex[ind1-1]];
262 Int_t biggerindex=-1;
263 for(Int_t ind2=0;ind2<index+1;ind2++){
265 for(Int_t ind3=0; ind3<ind1; ind3++)
266 if(ind2==sortedIndex[ind3]) use=kFALSE;
267 if(use && isIndUsed[ind2]>bigger && isIndUsed[ind2]<=cap){
268 bigger=isIndUsed[ind2];
272 sortedIndex[ind1]=biggerindex;
274 AliDebug(3,Form("Number of clusters before merging = %d\n",nClusters));
276 // Assign lines to clusters/vertices and merge clusters which share 1 line
277 Int_t nClustersAfterMerge=nClusters;
278 Int_t* belongsTo=new Int_t[nLines];
279 for(Int_t ilin=0; ilin<nLines; ilin++) belongsTo[ilin]=-1;
280 for(Int_t iclu=0;iclu<nClusters;iclu++){
281 Int_t actualCluIndex=iclu;
282 for(Int_t ip=0; ip<npoints;ip++){
283 if(mask[ip]==sortedIndex[iclu]){
284 Int_t ind1=index1[ip];
285 if(belongsTo[ind1]==-1) belongsTo[ind1]=actualCluIndex;
286 else if(belongsTo[ind1]<actualCluIndex){
287 Int_t newCluIndex=belongsTo[ind1];
288 for(Int_t ilin=0; ilin<nLines; ilin++){
289 if(belongsTo[ilin]==actualCluIndex) belongsTo[ilin]=newCluIndex;
291 AliDebug(10,Form("Merged cluster %d with %d\n",actualCluIndex,newCluIndex));
292 actualCluIndex=newCluIndex;
293 nClustersAfterMerge--;
295 Int_t ind2=index2[ip];
296 if(belongsTo[ind2]==-1) belongsTo[ind2]=actualCluIndex;
297 else if(belongsTo[ind2]<actualCluIndex){
298 Int_t newCluIndex=belongsTo[ind2];
299 for(Int_t ilin=0; ilin<nLines; ilin++){
300 if(belongsTo[ilin]==actualCluIndex) belongsTo[ilin]=newCluIndex;
302 AliDebug(10,Form("Merged cluster %d with %d\n",actualCluIndex,newCluIndex));
303 actualCluIndex=newCluIndex;
304 nClustersAfterMerge--;
309 AliDebug(3,Form("Number of clusters after merging = %d\n",nClustersAfterMerge));
311 // Count lines associated to each cluster/vertex
312 UInt_t *cluSize=new UInt_t[nClusters];
313 for(Int_t iclu=0;iclu<nClusters;iclu++){
315 for(Int_t ilin=0; ilin<nLines; ilin++){
316 if(belongsTo[ilin]==iclu) cluSize[iclu]++;
320 // Count good vertices (>1 associated tracklet)
322 for(Int_t iclu=0;iclu<nClusters;iclu++){
323 AliDebug(3,Form("Vertex %d Size=%d\n",iclu,cluSize[iclu]));
324 if(cluSize[iclu]>1) nGoodVert++;
327 AliDebug(1,Form("Number of good vertices = %d\n",nGoodVert));
328 // Calculate vertex coordinates for each cluster
330 fVertArray = new AliESDVertex[nGoodVert];
332 for(Int_t iclu=0;iclu<nClusters;iclu++){
333 Int_t size=cluSize[iclu];
335 AliStrLine **arrlin = new AliStrLine*[size];
337 for(Int_t ilin=0; ilin<nLines; ilin++){
338 if(belongsTo[ilin]==iclu){
339 arrlin[nFilled++] = dynamic_cast<AliStrLine*>(fLines[ilin]);
342 AliDebug(3,Form("Vertex %d N associated tracklets = %d out of %d\n",iVert,size,nFilled));
344 fVertArray[iVert]=AliVertexerTracks::TrackletVertexFinder(arrlin,nFilled);
346 fVertArray[iVert].GetXYZ(peak);
347 AliStrLine **arrlin2 = new AliStrLine*[size];
349 for(Int_t i=0; i<nFilled;i++){
350 AliStrLine *l1 = arrlin[i];
351 if(l1->GetDistFromPoint(peak)< fDCAcut)
352 arrlin2[nFilled2++] = dynamic_cast<AliStrLine*>(l1);
355 AliDebug(3,Form("Vertex %d recalculated with %d tracklets\n",iVert,nFilled2));
356 fVertArray[iVert]=AliVertexerTracks::TrackletVertexFinder(arrlin2,nFilled2);
366 fNTrpuv = fVertArray[1].GetNContributors();
367 fZpuv = fVertArray[1].GetZv();
370 Double_t vRadius=TMath::Sqrt(fVertArray[0].GetXv()*fVertArray[0].GetXv()+fVertArray[0].GetYv()*fVertArray[0].GetYv());
371 if(vRadius<GetPipeRadius() && fVertArray[0].GetNContributors()>0){
372 Double_t position[3]={fVertArray[0].GetXv(),fVertArray[0].GetYv(),fVertArray[0].GetZv()};
373 Double_t covmatrix[6];
374 fVertArray[0].GetCovMatrix(covmatrix);
375 Double_t chi2=99999.;
376 Int_t nContr=fVertArray[0].GetNContributors();
377 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
378 fCurrentVertex->SetTitle("vertexer: 3D");
379 fCurrentVertex->SetName("SPDVertex3D");
380 fCurrentVertex->SetDispersion(fVertArray[0].GetDispersion());
388 delete [] sortedIndex;
395 //______________________________________________________________________
396 void AliITSVertexer3D::FindVertex3DIterativeMM(){
397 // Defines the AliESDVertex for the current event
398 Int_t numsor=fLines.GetEntriesFast()*(fLines.GetEntriesFast()-1)/2;
399 //cout<<"AliITSVertexer3D::FindVertexForCurentEvent: Number of tracklets selected for vertexing "<<fLines.GetEntriesFast()<<"; Number of pairs: "<<numsor<<endl;
400 AliITSSortTrkl srt(fLines,numsor,fCutOnPairs,fCoarseMaxRCut);
402 AliInfo(Form("Number of vertices: %d",srt.GetNumberOfClusters()));
404 fNoVertices = srt.GetNumberOfClusters();
405 //printf("fNoVertices = %d \n",fNoVertices);
407 fVertArray = new AliESDVertex[fNoVertices];
408 for(Int_t kk=0; kk<srt.GetNumberOfClusters(); kk++){
410 Int_t *labels = srt.GetTrackletsLab(kk,size);
412 Int_t *pairs = srt.GetClusters(kk);
413 Int_t nopai = srt.GetSizeOfCluster(kk);
414 cout<<"***** Vertex number "<<kk<<". Pairs: \n";
415 for(Int_t jj=0;jj<nopai;jj++){
416 cout<<pairs[jj]<<" - ";
417 if(jj>0 & jj%8==0)cout<<endl;
420 cout<<"***** Vertex number "<<kk<<". Labels: \n";
422 AliStrLine **tclo = new AliStrLine* [size];
423 for(Int_t jj=0;jj<size;jj++){
424 // cout<<labels[jj]<<" - ";
425 // if(jj>0 & jj%8==0)cout<<endl;
426 tclo[jj] = dynamic_cast<AliStrLine*>(fLines[labels[jj]]);
430 fVertArray[kk]=AliVertexerTracks::TrackletVertexFinder(tclo,size);
432 // fVertArray[kk].PrintStatus();
434 // at least one second vertex is present
436 fNTrpuv = fVertArray[kk].GetNContributors();
437 fZpuv = fVertArray[kk].GetZv();
440 Double_t vRadius=TMath::Sqrt(fVertArray[0].GetXv()*fVertArray[0].GetXv()+fVertArray[0].GetYv()*fVertArray[0].GetYv());
441 if(vRadius<GetPipeRadius() && fVertArray[0].GetNContributors()>0){
442 Double_t position[3]={fVertArray[0].GetXv(),fVertArray[0].GetYv(),fVertArray[0].GetZv()};
443 Double_t covmatrix[6];
444 fVertArray[0].GetCovMatrix(covmatrix);
445 Double_t chi2=99999.;
446 Int_t nContr=fVertArray[0].GetNContributors();
447 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
448 fCurrentVertex->SetTitle("vertexer: 3D");
449 fCurrentVertex->SetName("SPDVertex3D");
450 fCurrentVertex->SetDispersion(fVertArray[0].GetDispersion());
456 //______________________________________________________________________
457 Bool_t AliITSVertexer3D::DistBetweenVertices(AliESDVertex &a, AliESDVertex &b, Double_t test, Double_t &dist){
458 // method to compare the distance between vertices a and b with "test"
459 //it returns kTRUE is the distance is less or equal to test
460 dist = (a.GetX()-b.GetX()) * (a.GetX()-b.GetX());
461 dist += (a.GetY()-b.GetY()) * (a.GetY()-b.GetY());
462 dist += (a.GetZ()-b.GetZ()) * (a.GetZ()-b.GetZ());
463 dist = TMath::Sqrt(dist);
464 if(dist <= test)return kTRUE;
469 //______________________________________________________________________
470 Int_t AliITSVertexer3D::FindTracklets(TTree *itsClusterTree, Int_t optCuts){
471 // All the possible combinations between recpoints on layer 1and 2 are
472 // considered. Straight lines (=tracklets)are formed.
473 // The tracklets are processed in Prepare3DVertex
475 TClonesArray *itsRec = 0;
476 if(optCuts==0) fZHisto->Reset();
477 // gc1 are local and global coordinates for layer 1
478 Float_t gc1f[3]={0.,0.,0.};
479 Double_t gc1[3]={0.,0.,0.};
480 // gc2 are local and global coordinates for layer 2
481 Float_t gc2f[3]={0.,0.,0.};
482 Double_t gc2[3]={0.,0.,0.};
483 AliITSRecPointContainer* rpcont=AliITSRecPointContainer::Instance();
484 itsRec=rpcont->FetchClusters(0,itsClusterTree);
485 if(!rpcont->IsSPDActive()){
486 AliWarning("No SPD rec points found, 3D vertex not calculated");
490 // Set values for cuts
491 Double_t xbeam=GetNominalPos()[0];
492 Double_t ybeam=GetNominalPos()[1];
494 Double_t deltaPhi=fCoarseDiffPhiCut;
495 Double_t deltaR=fCoarseMaxRCut;
496 Double_t dZmax=fZCutDiamond;
498 xbeam=fVert3D.GetXv();
499 ybeam=fVert3D.GetYv();
500 zvert=fVert3D.GetZv();
501 deltaPhi = fDiffPhiMax;
504 if(fPileupAlgo == 2){
508 } else if(optCuts==2){
509 xbeam=fVert3D.GetXv();
510 ybeam=fVert3D.GetYv();
511 deltaPhi = fDiffPhiforPileup;
515 Int_t nrpL1 = 0; // number of rec points on layer 1
516 Int_t nrpL2 = 0; // number of rec points on layer 2
518 // By default irstL1=0 and lastL1=79
519 Int_t firstL1 = AliITSgeomTGeo::GetModuleIndex(1,1,1);
520 Int_t lastL1 = AliITSgeomTGeo::GetModuleIndex(2,1,1)-1;
521 for(Int_t module= firstL1; module<=lastL1;module++){ // count number of recopints on layer 1
522 itsRec=rpcont->UncheckedGetClusters(module);
523 nrpL1+= itsRec->GetEntries();
525 //By default firstL2=80 and lastL2=239
526 Int_t firstL2 = AliITSgeomTGeo::GetModuleIndex(2,1,1);
527 Int_t lastL2 = AliITSgeomTGeo::GetModuleIndex(3,1,1)-1;
528 for(Int_t module= firstL2; module<=lastL2;module++){ // count number of recopints on layer 2
529 itsRec=rpcont->UncheckedGetClusters(module);
530 nrpL2+= itsRec->GetEntries();
532 if(nrpL1 == 0 || nrpL2 == 0){
533 AliDebug(1,Form("No RecPoints in at least one SPD layer (%d %d)",nrpL1,nrpL2));
536 AliDebug(1,Form("RecPoints on Layer 1,2 = %d, %d\n",nrpL1,nrpL2));
537 if(nrpL1>fMaxNumOfCl || nrpL2>fMaxNumOfCl){
538 AliWarning(Form("Too many recpoints on SPD(%d %d ), call vertexerZ",nrpL1,nrpL2));
542 Double_t a[3]={xbeam,ybeam,0.};
543 Double_t b[3]={xbeam,ybeam,10.};
544 AliStrLine zeta(a,b,kTRUE);
545 static Double_t bField=TMath::Abs(AliTracker::GetBz()/10.); //T
546 SetMeanPPtSelTracks(bField);
549 // Loop on modules of layer 1
550 for(Int_t modul1= firstL1; modul1<=lastL1;modul1++){ // Loop on modules of layer 1
551 if(!fUseModule[modul1]) continue;
552 UShort_t ladder=int(modul1/4)+1; // ladders are numbered starting from 1
553 TClonesArray *prpl1=rpcont->UncheckedGetClusters(modul1);
554 Int_t nrecp1 = prpl1->GetEntries();
555 for(Int_t j=0;j<nrecp1;j++){
556 if(j>kMaxCluPerMod) continue;
557 UShort_t idClu1=modul1*kMaxCluPerMod+j;
558 if(fUsedCluster.TestBitNumber(idClu1)) continue;
559 AliITSRecPoint *recp1 = (AliITSRecPoint*)prpl1->At(j);
560 recp1->GetGlobalXYZ(gc1f);
561 for(Int_t ico=0;ico<3;ico++)gc1[ico]=gc1f[ico];
563 Double_t phi1 = TMath::ATan2(gc1[1]-ybeam,gc1[0]-xbeam);
564 if(phi1<0)phi1=2*TMath::Pi()+phi1;
565 for(Int_t ladl2=0 ; ladl2<fLadOnLay2*2+1;ladl2++){
566 for(Int_t k=0;k<4;k++){
567 Int_t ladmod=fLadders[ladder-1]+ladl2;
568 if(ladmod>AliITSgeomTGeo::GetNLadders(2)) ladmod=ladmod-AliITSgeomTGeo::GetNLadders(2);
569 Int_t modul2=AliITSgeomTGeo::GetModuleIndex(2,ladmod,k+1);
570 if(!fUseModule[modul2]) continue;
571 itsRec=rpcont->UncheckedGetClusters(modul2);
572 Int_t nrecp2 = itsRec->GetEntries();
573 for(Int_t j2=0;j2<nrecp2;j2++){
574 if(j2>kMaxCluPerMod) continue;
575 UShort_t idClu2=modul2*kMaxCluPerMod+j2;
576 if(fUsedCluster.TestBitNumber(idClu2)) continue;
577 AliITSRecPoint *recp2 = (AliITSRecPoint*)itsRec->At(j2);
578 recp2->GetGlobalXYZ(gc2f);
579 for(Int_t ico=0;ico<3;ico++)gc2[ico]=gc2f[ico];
580 Double_t phi2 = TMath::ATan2(gc2[1]-ybeam,gc2[0]-xbeam);
581 if(phi2<0)phi2=2*TMath::Pi()+phi2;
582 Double_t diff = TMath::Abs(phi2-phi1);
583 if(diff>TMath::Pi())diff=2.*TMath::Pi()-diff;
584 if(optCuts==0 && diff<fDiffPhiforPileup){
585 Double_t r1=TMath::Sqrt(gc1[0]*gc1[0]+gc1[1]*gc1[1]);
587 Double_t r2=TMath::Sqrt(gc2[0]*gc2[0]+gc2[1]*gc2[1]);
589 Double_t zr0=(r2*zc1-r1*zc2)/(r2-r1); //Z @ null radius
592 if(diff>deltaPhi)continue;
593 AliStrLine line(gc1,gc2,kTRUE);
595 Int_t retcode = line.Cross(&zeta,cp);
596 if(retcode<0)continue;
597 Double_t dca = line.GetDCA(&zeta);
599 if(dca>deltaR)continue;
600 Double_t deltaZ=cp[2]-zvert;
601 if(TMath::Abs(deltaZ)>dZmax)continue;
604 if(fLines.GetEntriesFast()>0)fLines.Clear("C");
607 recp2->GetGlobalCov(cov);
610 Double_t rad1=TMath::Sqrt(gc1[0]*gc1[0]+gc1[1]*gc1[1]);
611 Double_t rad2=TMath::Sqrt(gc2[0]*gc2[0]+gc2[1]*gc2[1]);
612 Double_t factor=(rad1+rad2)/(rad2-rad1); //factor to account for error on tracklet direction
616 Double_t curvRadius=fMeanPtSelTrk/(0.3*bField)*100; //cm
617 Double_t dRad=TMath::Sqrt((gc1[0]-gc2[0])*(gc1[0]-gc2[0])+(gc1[1]-gc2[1])*(gc1[1]-gc2[1]));
618 Double_t aux=dRad/2.+rad1;
619 curvErr=TMath::Sqrt(curvRadius*curvRadius-dRad*dRad/4.)-TMath::Sqrt(curvRadius*curvRadius-aux*aux); //cm
622 sigmasq[0]=(cov[0]+curvErr*curvErr/2.)*factor*factor;
623 sigmasq[1]=(cov[3]+curvErr*curvErr/2.)*factor*factor;
624 sigmasq[2]=cov[5]*factor*factor;
626 // Multiple scattering
627 Double_t pOverMass=fMeanPSelTrk/0.140;
628 Double_t beta2=pOverMass*pOverMass/(1+pOverMass*pOverMass);
629 Double_t p2=fMeanPSelTrk*fMeanPSelTrk;
630 Double_t rBP=GetPipeRadius();
631 Double_t dBP=0.08/35.3; // 800 um of Be
632 Double_t dL1=0.01; //approx. 1% of radiation length
633 Double_t theta2BP=14.1*14.1/(beta2*p2*1e6)*dBP;
634 Double_t theta2L1=14.1*14.1/(beta2*p2*1e6)*dL1;
635 Double_t rtantheta1=(rad2-rad1)*TMath::Tan(TMath::Sqrt(theta2L1));
636 Double_t rtanthetaBP=(rad1-rBP)*TMath::Tan(TMath::Sqrt(theta2BP));
637 for(Int_t ico=0; ico<3;ico++){
638 sigmasq[ico]+=rtantheta1*rtantheta1*factor*factor/3.;
639 sigmasq[ico]+=rtanthetaBP*rtanthetaBP*factor*factor/3.;
641 Double_t wmat[9]={1.,0.,0.,0.,1.,0.,0.,0.,1.};
642 if(sigmasq[0]!=0.) wmat[0]=1./sigmasq[0];
643 if(sigmasq[1]!=0.) wmat[4]=1./sigmasq[1];
644 if(sigmasq[2]!=0.) wmat[8]=1./sigmasq[2];
645 new(fLines[nolines++])AliStrLine(gc1,sigmasq,wmat,gc2,kTRUE,idClu1,idClu2);
652 if(nolines == 0)return -2;
656 //______________________________________________________________________
657 Int_t AliITSVertexer3D::Prepare3DVertex(Int_t optCuts){
658 // Finds the 3D vertex information using tracklets
661 Double_t xbeam=GetNominalPos()[0];
662 Double_t ybeam=GetNominalPos()[1];
664 Double_t deltaR=fCoarseMaxRCut;
665 Double_t dZmax=fZCutDiamond;
667 xbeam=fVert3D.GetXv();
668 ybeam=fVert3D.GetYv();
669 zvert=fVert3D.GetZv();
672 if(fPileupAlgo == 2){
676 }else if(optCuts==2){
677 xbeam=fVert3D.GetXv();
678 ybeam=fVert3D.GetYv();
682 Double_t rl=-fCoarseMaxRCut;
683 Double_t rh=fCoarseMaxRCut;
684 Double_t zl=-fZCutDiamond;
685 Double_t zh=fZCutDiamond;
686 Int_t nbr=(Int_t)((rh-rl)/fBinSizeR+0.0001);
687 Int_t nbz=(Int_t)((zh-zl)/fBinSizeZ+0.0001);
688 Int_t nbrcs=(Int_t)((rh-rl)/(fBinSizeR*2.)+0.0001);
689 Int_t nbzcs=(Int_t)((zh-zl)/(fBinSizeZ*2.)+0.0001);
691 TH3F *h3d = new TH3F("h3d","xyz distribution",nbr,rl,rh,nbr,rl,rh,nbz,zl,zh);
692 TH3F *h3dcs = new TH3F("h3dcs","xyz distribution",nbrcs,rl,rh,nbrcs,rl,rh,nbzcs,zl,zh);
694 // cleanup of the TCLonesArray of tracklets (i.e. fakes are removed)
695 Int_t *validate = new Int_t [fLines.GetEntriesFast()];
696 for(Int_t i=0; i<fLines.GetEntriesFast();i++)validate[i]=0;
697 for(Int_t i=0; i<fLines.GetEntriesFast()-1;i++){
698 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
699 for(Int_t j=i+1;j<fLines.GetEntriesFast();j++){
700 AliStrLine *l2 = (AliStrLine*)fLines.At(j);
701 Double_t dca=l1->GetDCA(l2);
702 if(dca > fDCAcut || dca<0.00001) continue;
704 Int_t retc = l1->Cross(l2,point);
706 Double_t deltaZ=point[2]-zvert;
707 if(TMath::Abs(deltaZ)>dZmax)continue;
708 Double_t rad=TMath::Sqrt(point[0]*point[0]+point[1]*point[1]);
709 if(rad>fCoarseMaxRCut)continue;
710 Double_t deltaX=point[0]-xbeam;
711 Double_t deltaY=point[1]-ybeam;
712 Double_t raddist=TMath::Sqrt(deltaX*deltaX+deltaY*deltaY);
713 if(raddist>deltaR)continue;
716 h3d->Fill(point[0],point[1],point[2]);
717 h3dcs->Fill(point[0],point[1],point[2]);
723 Int_t numbtracklets=0;
724 for(Int_t i=0; i<fLines.GetEntriesFast();i++)if(validate[i]>=1)numbtracklets++;
732 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
733 if(validate[i]<1)fLines.RemoveAt(i);
736 AliDebug(1,Form("Number of tracklets (after compress)%d ",fLines.GetEntriesFast()));
739 // Exit here if Pileup Algorithm 2 has been chosen during second loop
740 if(fPileupAlgo == 2 && optCuts==1){
746 // Find peaks in histos
748 Double_t peak[3]={0.,0.,0.};
750 FindPeaks(h3d,peak,ntrkl,ntimes);
752 Double_t binsizer=(rh-rl)/nbr;
753 Double_t binsizez=(zh-zl)/nbz;
754 if(optCuts==0 && (ntrkl<=2 || ntimes>1)){
757 FindPeaks(h3dcs,peak,ntrkl,ntimes);
758 binsizer=(rh-rl)/nbrcs;
759 binsizez=(zh-zl)/nbzcs;
760 if(ntrkl==1 || ntimes>1){delete h3dcs; return retcode;}
764 // Second selection loop
766 Double_t bs=(binsizer+binsizez)/2.;
767 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
768 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
769 if(l1->GetDistFromPoint(peak)>2.5*bs)fLines.RemoveAt(i);
772 AliDebug(1,Form("Number of tracklets (after 2nd compression) %d",fLines.GetEntriesFast()));
774 if(fLines.GetEntriesFast()>1){
776 // find a first candidate for the primary vertex
777 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
778 // make a further selection on tracklets based on this first candidate
779 fVert3D.GetXYZ(peak);
780 AliDebug(1,Form("FIRST V candidate: %f ; %f ; %f",peak[0],peak[1],peak[2]));
781 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
782 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
783 if(l1->GetDistFromPoint(peak)> fDCAcut)fLines.RemoveAt(i);
786 AliDebug(1,Form("Number of tracklets (after 3rd compression) %d",fLines.GetEntriesFast()));
787 if(fLines.GetEntriesFast()>1){// this new tracklet selection is used
788 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
794 //________________________________________________________
795 void AliITSVertexer3D::SetMeanPPtSelTracks(Double_t fieldTesla){
796 // Sets mean values of Pt based on the field
797 // for P (used in multiple scattering) the most probable value is used
798 if(TMath::Abs(fieldTesla-0.5)<0.01){
799 SetMeanPSelTracks(0.375);
800 SetMeanPtSelTracks(0.630);
801 }else if(TMath::Abs(fieldTesla-0.4)<0.01){
802 SetMeanPSelTracks(0.375);
803 SetMeanPtSelTracks(0.580);
804 }else if(TMath::Abs(fieldTesla-0.2)<0.01){
805 SetMeanPSelTracks(0.375);
806 SetMeanPtSelTracks(0.530);
807 }else if(fieldTesla<0.00001){
808 SetMeanPSelTracks(0.375);
809 SetMeanPtSelTracks(0.230);
812 SetMeanPtSelTracks();
816 //________________________________________________________
817 void AliITSVertexer3D::FindPeaks(TH3F* histo, Double_t *peak, Int_t &nOfTracklets, Int_t &nOfTimes){
818 // Finds bin with max contents in 3D histo of tracket intersections
819 TAxis *xax = histo->GetXaxis();
820 TAxis *yax = histo->GetYaxis();
821 TAxis *zax = histo->GetZaxis();
827 Int_t peakbin[3]={0,0,0};
828 Int_t peak2bin[3]={-1,-1,-1};
830 for(Int_t i=xax->GetFirst();i<=xax->GetLast();i++){
831 Double_t xval = xax->GetBinCenter(i);
832 for(Int_t j=yax->GetFirst();j<=yax->GetLast();j++){
833 Double_t yval = yax->GetBinCenter(j);
834 for(Int_t k=zax->GetFirst();k<=zax->GetLast();k++){
835 Double_t zval = zax->GetBinCenter(k);
836 Int_t bc =(Int_t)histo->GetBinContent(i,j,k);
851 }else if(bc==nOfTracklets){
852 if(TMath::Abs(i-peakbin[0])<=1 && TMath::Abs(j-peakbin[1])<=1 && TMath::Abs(k-peakbin[2])<=1){
865 if(peak2bin[0]>=-1 && bc2!=-1){ // two contiguous peak-cells with same contents
866 peak[0]=0.5*(xax->GetBinCenter(peakbin[0])+xax->GetBinCenter(peak2bin[0]));
867 peak[1]=0.5*(yax->GetBinCenter(peakbin[1])+yax->GetBinCenter(peak2bin[1]));
868 peak[2]=0.5*(zax->GetBinCenter(peakbin[2])+zax->GetBinCenter(peak2bin[2]));
873 //________________________________________________________
874 void AliITSVertexer3D::MarkUsedClusters(){
875 // Mark clusters of tracklets used in vertex claulation
876 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
877 AliStrLine *lin = (AliStrLine*)fLines.At(i);
878 Int_t idClu1=lin->GetIdPoint(0);
879 Int_t idClu2=lin->GetIdPoint(1);
880 fUsedCluster.SetBitNumber(idClu1);
881 fUsedCluster.SetBitNumber(idClu2);
884 //________________________________________________________
885 Int_t AliITSVertexer3D::RemoveTracklets(){
886 // Remove trackelts close to first found vertex
887 Double_t vert[3]={fVert3D.GetXv(),fVert3D.GetYv(),fVert3D.GetZv()};
889 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
890 AliStrLine *lin = (AliStrLine*)fLines.At(i);
891 if(lin->GetDistFromPoint(vert)<fDCAforPileup){
892 Int_t idClu1=lin->GetIdPoint(0);
893 Int_t idClu2=lin->GetIdPoint(1);
894 fUsedCluster.SetBitNumber(idClu1);
895 fUsedCluster.SetBitNumber(idClu2);
903 //________________________________________________________
904 void AliITSVertexer3D::FindOther3DVertices(TTree *itsClusterTree){
905 // pileup identification based on 3D vertexing with not used clusters
908 Int_t nolines = FindTracklets(itsClusterTree,2);
910 Int_t nr=RemoveTracklets();
913 Int_t rc=Prepare3DVertex(2);
915 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
916 if(fVert3D.GetNContributors()>=fMinTrackletsForPilup){
919 fVertArray = new AliESDVertex[2];
920 fVertArray[0]=(*fCurrentVertex);
921 fVertArray[1]=fVert3D;
922 fZpuv=fVert3D.GetZv();
923 fNTrpuv=fVert3D.GetNContributors();
929 //______________________________________________________________________
930 void AliITSVertexer3D::PileupFromZ(){
931 // Calls the pileup algorithm of ALiITSVertexerZ
932 Int_t binmin, binmax;
933 Int_t nPeaks=AliITSVertexerZ::GetPeakRegion(fZHisto,binmin,binmax);
934 if(nPeaks==2)AliWarning("2 peaks found");
935 Int_t firstPeakCont=0;
936 Double_t firstPeakPos=0.;
937 for(Int_t i=binmin-1;i<=binmax+1;i++){
938 firstPeakCont+=static_cast<Int_t>(fZHisto->GetBinContent(i));
939 firstPeakPos+=fZHisto->GetBinContent(i)*fZHisto->GetBinCenter(i);
942 firstPeakPos/=firstPeakCont;
944 if(firstPeakCont>fMinTrackletsForPilup){
946 ncontr2=AliITSVertexerZ::FindSecondPeak(fZHisto,binmin,binmax,secPeakPos);
947 if(ncontr2>=fMinTrackletsForPilup){
950 AliESDVertex secondVert(secPeakPos,0.1,ncontr2);
951 fVertArray = new AliESDVertex[2];
952 fVertArray[0]=(*fCurrentVertex);
953 fVertArray[1]=secondVert;
960 //________________________________________________________
961 void AliITSVertexer3D::PrintStatus() const {
962 // Print current status
963 printf("========= First step selections =====================\n");
964 printf("Cut on diamond (Z) %f\n",fZCutDiamond);
965 printf("Loose cut on Delta Phi %f\n",fCoarseDiffPhiCut);
966 printf("Loose cut on tracklet DCA to Z axis %f\n",fCoarseMaxRCut);
967 printf("Cut on DCA - tracklet to tracklet and to vertex %f\n",fDCAcut);
968 printf("========= Second step selections ====================\n");
969 printf("Cut on tracklet-to-first-vertex Z distance %f\n",fMaxZCut);
970 printf("Max Phi difference: %f\n",fDiffPhiMax);
971 printf("Cut on tracklet DCA to beam axis %f\n",fMaxRCut);
972 printf("Cut on tracklet DCA to beam axis (algo2) %f\n",fMaxRCut2);
973 printf("========= Pileup selections =========================\n");
974 printf("Pileup algo: %d\n",fPileupAlgo);
975 printf("Min DCA to 1st vertex for pileup (algo 0 and 1): %f\n",fDCAforPileup);
976 printf("Cut on distance between pair-vertices (algo 2): %f\n",fCutOnPairs);
977 printf("Maximum number of clusters allowed on L1 or L2: %d\n",fMaxNumOfCl);
978 printf("=======================================================\n");