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 "AliESDVertex.h"
18 #include "AliStrLine.h"
19 #include "AliTracker.h"
20 #include "AliITSDetTypeRec.h"
21 #include "AliITSRecPoint.h"
22 #include "AliITSgeomTGeo.h"
23 #include "AliVertexerTracks.h"
24 #include "AliITSVertexer3D.h"
25 #include "AliITSVertexerZ.h"
26 /////////////////////////////////////////////////////////////////
27 // this class implements a method to determine
28 // the 3 coordinates of the primary vertex
30 // It can be used successfully with Pb-Pb collisions
31 ////////////////////////////////////////////////////////////////
33 ClassImp(AliITSVertexer3D)
37 //______________________________________________________________________
38 AliITSVertexer3D::AliITSVertexer3D():AliITSVertexer(),
39 fLines("AliStrLine",1000),
41 fCoarseDiffPhiCut(0.),
50 fUsedCluster(kMaxCluPerMod*kNSPDMod),
55 // Default constructor
56 SetCoarseDiffPhiCut();
67 Float_t binsize=0.02; // default 200 micron
68 Int_t nbins=static_cast<Int_t>(1+2*fZCutDiamond/binsize);
69 fZHisto=new TH1F("hz","",nbins,-fZCutDiamond,-fZCutDiamond+binsize*nbins);
72 //______________________________________________________________________
73 AliITSVertexer3D::~AliITSVertexer3D() {
76 if(fZHisto) delete fZHisto;
79 //______________________________________________________________________
80 void AliITSVertexer3D::ResetVert3D(){
85 fVert3D.SetDispersion(0.);
86 fVert3D.SetNContributors(0);
90 fUsedCluster.ResetAllBits(0);
92 //______________________________________________________________________
93 AliESDVertex* AliITSVertexer3D::FindVertexForCurrentEvent(TTree *itsClusterTree){
94 // Defines the AliESDVertex for the current event
96 AliDebug(1,"FindVertexForCurrentEvent - 3D - PROCESSING NEXT EVENT");
99 Int_t nolines = FindTracklets(itsClusterTree,0);
102 Int_t rc=Prepare3DVertex(0);
103 if(rc==0) fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
104 /* uncomment to debug
105 printf("Vertex found in first iteration:\n");
107 printf("Start second iteration\n");
108 end of debug lines */
109 if(fVert3D.GetNContributors()>0){
111 nolines = FindTracklets(itsClusterTree,1);
113 rc=Prepare3DVertex(1);
114 if(rc==0) fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
117 /* uncomment to debug
118 printf("Vertex found in second iteration:\n");
120 end of debug lines */
122 Float_t vRadius=TMath::Sqrt(fVert3D.GetXv()*fVert3D.GetXv()+fVert3D.GetYv()*fVert3D.GetYv());
123 if(vRadius<GetPipeRadius() && fVert3D.GetNContributors()>0){
124 Double_t position[3]={fVert3D.GetXv(),fVert3D.GetYv(),fVert3D.GetZv()};
125 Double_t covmatrix[6];
126 fVert3D.GetCovMatrix(covmatrix);
127 Double_t chi2=99999.;
128 Int_t nContr=fVert3D.GetNContributors();
129 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
130 fCurrentVertex->SetTitle("vertexer: 3D");
131 fCurrentVertex->SetName("SPDVertex3D");
132 fCurrentVertex->SetDispersion(fVert3D.GetDispersion());
135 case 0: PileupFromZ(); break;
136 case 1: FindOther3DVertices(itsClusterTree); break;
137 default: AliError("Wrong pileup algorithm"); break;
142 AliITSVertexerZ vertz(GetNominalPos()[0],GetNominalPos()[1]);
143 vertz.SetDetTypeRec(GetDetTypeRec());
144 AliDebug(1,"Call Vertexer Z\n");
145 vertz.SetLowLimit(-fZCutDiamond);
146 vertz.SetHighLimit(fZCutDiamond);
147 AliESDVertex* vtxz = vertz.FindVertexForCurrentEvent(itsClusterTree);
149 Double_t position[3]={GetNominalPos()[0],GetNominalPos()[1],vtxz->GetZv()};
150 Double_t covmatrix[6];
151 vtxz->GetCovMatrix(covmatrix);
152 Double_t chi2=99999.;
153 Int_t nContr=vtxz->GetNContributors();
154 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
155 fCurrentVertex->SetTitle("vertexer: Z");
156 fCurrentVertex->SetName("SPDVertexZ");
158 // printf("Vertexer Z success\n");
162 FindMultiplicity(itsClusterTree);
163 return fCurrentVertex;
166 //______________________________________________________________________
167 Int_t AliITSVertexer3D::FindTracklets(TTree *itsClusterTree, Int_t optCuts){
168 // All the possible combinations between recpoints on layer 1and 2 are
169 // considered. Straight lines (=tracklets)are formed.
170 // The tracklets are processed in Prepare3DVertex
172 TTree *tR = itsClusterTree;
173 fDetTypeRec->SetTreeAddressR(tR);
174 TClonesArray *itsRec = 0;
175 if(optCuts==0) fZHisto->Reset();
176 // lc1 and gc1 are local and global coordinates for layer 1
177 // Float_t lc1[3]={0.,0.,0.};
178 Float_t gc1[3]={0.,0.,0.};
179 // lc2 and gc2 are local and global coordinates for layer 2
180 // Float_t lc2[3]={0.,0.,0.};
181 Float_t gc2[3]={0.,0.,0.};
183 itsRec = fDetTypeRec->RecPoints();
185 branch = tR->GetBranch("ITSRecPoints");
187 // Set values for cuts
188 Float_t xbeam=GetNominalPos()[0];
189 Float_t ybeam=GetNominalPos()[1];
191 Float_t deltaPhi=fCoarseDiffPhiCut;
192 Float_t deltaR=fCoarseMaxRCut;
193 Float_t dZmax=fZCutDiamond;
195 xbeam=fVert3D.GetXv();
196 ybeam=fVert3D.GetYv();
197 zvert=fVert3D.GetZv();
198 deltaPhi = fDiffPhiMax;
201 }else if(optCuts==2){
202 xbeam=fVert3D.GetXv();
203 ybeam=fVert3D.GetYv();
204 deltaPhi = fDiffPhiMax;
208 Int_t nrpL1 = 0; // number of rec points on layer 1
209 Int_t nrpL2 = 0; // number of rec points on layer 2
211 // By default irstL1=0 and lastL1=79
212 Int_t firstL1 = AliITSgeomTGeo::GetModuleIndex(1,1,1);
213 Int_t lastL1 = AliITSgeomTGeo::GetModuleIndex(2,1,1)-1;
214 for(Int_t module= firstL1; module<=lastL1;module++){ // count number of recopints on layer 1
215 branch->GetEvent(module);
216 nrpL1+= itsRec->GetEntries();
217 fDetTypeRec->ResetRecPoints();
219 //By default firstL2=80 and lastL2=239
220 Int_t firstL2 = AliITSgeomTGeo::GetModuleIndex(2,1,1);
221 Int_t lastL2 = AliITSgeomTGeo::GetModuleIndex(3,1,1)-1;
222 for(Int_t module= firstL2; module<=lastL2;module++){ // count number of recopints on layer 2
223 branch->GetEvent(module);
224 nrpL2+= itsRec->GetEntries();
225 fDetTypeRec->ResetRecPoints();
227 if(nrpL1 == 0 || nrpL2 == 0){
230 AliDebug(1,Form("RecPoints on Layer 1,2 = %d, %d\n",nrpL1,nrpL2));
232 Double_t a[3]={xbeam,ybeam,0.};
233 Double_t b[3]={xbeam,ybeam,10.};
234 AliStrLine zeta(a,b,kTRUE);
235 Float_t bField=AliTracker::GetBz()/10.; //T
236 SetMeanPPtSelTracks(bField);
239 // Loop on modules of layer 1
240 for(Int_t modul1= firstL1; modul1<=lastL1;modul1++){ // Loop on modules of layer 1
241 if(!fUseModule[modul1]) continue;
242 UShort_t ladder=int(modul1/4)+1; // ladders are numbered starting from 1
243 branch->GetEvent(modul1);
244 Int_t nrecp1 = itsRec->GetEntries();
245 static TClonesArray prpl1("AliITSRecPoint",nrecp1);
247 for(Int_t j=0;j<nrecp1;j++){
248 AliITSRecPoint *recp = (AliITSRecPoint*)itsRec->At(j);
249 new(prpl1[j])AliITSRecPoint(*recp);
251 fDetTypeRec->ResetRecPoints();
252 for(Int_t j=0;j<nrecp1;j++){
253 if(j>kMaxCluPerMod) continue;
254 UShort_t idClu1=modul1*kMaxCluPerMod+j;
255 if(fUsedCluster.TestBitNumber(idClu1)) continue;
256 AliITSRecPoint *recp1 = (AliITSRecPoint*)prpl1.At(j);
257 // Local coordinates of this recpoint
259 lc[0]=recp1->GetDetLocalX();
260 lc[2]=recp1->GetDetLocalZ();
262 recp1->GetGlobalXYZ(gc1);
263 Double_t phi1 = TMath::ATan2(gc1[1]-ybeam,gc1[0]-xbeam);
264 if(phi1<0)phi1=2*TMath::Pi()+phi1;
265 for(Int_t ladl2=0 ; ladl2<fLadOnLay2*2+1;ladl2++){
266 for(Int_t k=0;k<4;k++){
267 Int_t ladmod=fLadders[ladder-1]+ladl2;
268 if(ladmod>AliITSgeomTGeo::GetNLadders(2)) ladmod=ladmod-AliITSgeomTGeo::GetNLadders(2);
269 Int_t modul2=AliITSgeomTGeo::GetModuleIndex(2,ladmod,k+1);
270 if(!fUseModule[modul2]) continue;
271 branch->GetEvent(modul2);
272 Int_t nrecp2 = itsRec->GetEntries();
273 for(Int_t j2=0;j2<nrecp2;j2++){
274 if(j2>kMaxCluPerMod) continue;
275 UShort_t idClu2=modul2*kMaxCluPerMod+j2;
276 if(fUsedCluster.TestBitNumber(idClu2)) continue;
277 AliITSRecPoint *recp2 = (AliITSRecPoint*)itsRec->At(j2);
279 lc2[0]=recp2->GetDetLocalX();
280 lc2[2]=recp2->GetDetLocalZ();
282 recp2->GetGlobalXYZ(gc2);
283 Double_t phi2 = TMath::ATan2(gc2[1]-ybeam,gc2[0]-xbeam);
284 if(phi2<0)phi2=2*TMath::Pi()+phi2;
285 Double_t diff = TMath::Abs(phi2-phi1);
286 if(diff>TMath::Pi())diff=2.*TMath::Pi()-diff;
287 if(optCuts==0 && diff<fDiffPhiMax){
288 Float_t r1=TMath::Sqrt(gc1[0]*gc1[0]+gc1[1]*gc1[1]);
290 Float_t r2=TMath::Sqrt(gc2[0]*gc2[0]+gc2[1]*gc2[1]);
292 Float_t zr0=(r2*zc1-r1*zc2)/(r2-r1); //Z @ null radius
295 if(diff>deltaPhi)continue;
296 AliStrLine line(gc1,gc2,kTRUE);
298 Int_t retcode = line.Cross(&zeta,cp);
299 if(retcode<0)continue;
300 Double_t dca = line.GetDCA(&zeta);
302 if(dca>deltaR)continue;
303 Double_t deltaZ=cp[2]-zvert;
304 if(TMath::Abs(deltaZ)>dZmax)continue;
307 if(fLines.GetEntriesFast()>0)fLines.Clear("C");
310 recp2->GetGlobalCov(cov);
313 Float_t rad1=TMath::Sqrt(gc1[0]*gc1[0]+gc1[1]*gc1[1]);
314 Float_t rad2=TMath::Sqrt(gc2[0]*gc2[0]+gc2[1]*gc2[1]);
315 Float_t factor=(rad1+rad2)/(rad2-rad1); //factor to account for error on tracklet direction
319 Float_t curvRadius=fMeanPtSelTrk/(0.3*bField)*100; //cm
320 Float_t dRad=TMath::Sqrt(TMath::Power((gc1[0]-gc2[0]),2)+TMath::Power((gc1[1]-gc2[1]),2));
321 Float_t aux=dRad/2.+rad1;
322 curvErr=TMath::Sqrt(curvRadius*curvRadius-dRad*dRad/4.)-TMath::Sqrt(curvRadius*curvRadius-aux*aux); //cm
326 sigmasq[0]=(cov[0]+curvErr*curvErr/2.)*factor*factor;
327 sigmasq[1]=(cov[3]+curvErr*curvErr/2.)*factor*factor;
328 sigmasq[2]=cov[5]*factor*factor;
330 // Multiple scattering
332 Float_t beta2=beta*beta;
333 Float_t p2=fMeanPSelTrk*fMeanPSelTrk;
334 Float_t rBP=GetPipeRadius();
335 Float_t dBP=0.08/35.3; // 800 um of Be
336 Float_t dL1=0.01; //approx. 1% of radiation length
337 Float_t theta2BP=14.1*14.1/(beta2*p2*1e6)*TMath::Abs(dBP);
338 Float_t theta2L1=14.1*14.1/(beta2*p2*1e6)*TMath::Abs(dL1);
339 Float_t thetaBP=TMath::Sqrt(theta2BP);
340 Float_t thetaL1=TMath::Sqrt(theta2L1);
341 // Float_t geomfac[3];
342 // geomfac[0]=sin(phi1)*sin(phi1);
343 // geomfac[1]=cos(phi1)*cos(phi1);
344 // Float_t tgth=(gc2[2]-gc1[2])/(rad2-rad1);
345 // geomfac[2]=1+tgth*tgth;
346 for(Int_t ico=0; ico<3;ico++){
347 // printf("Error on coord. %d due to cov matrix+curvErr=%f\n",ico,sigmasq[ico]);
348 // // sigmasq[ico]+=rad1*rad1*geomfac[ico]*theta2L1/2; // multiple scattering in layer 1
349 // // sigmasq[ico]+=rBP*rBP*geomfac[ico]*theta2BP/2; // multiple scattering in beam pipe
350 sigmasq[ico]+=TMath::Power(rad1*TMath::Tan(thetaL1),2)/3.;
351 sigmasq[ico]+=TMath::Power(rBP*TMath::Tan(thetaBP),2)/3.;
353 // printf("Multipl. scatt. contr %d = %f (LAY1), %f (BP)\n",ico,rad1*rad1*geomfac[ico]*theta2L1/2,rBP*rBP*geomfac[ico]*theta2BP/2);
354 // printf("Total error on coord %d = %f\n",ico,sigmasq[ico]);
356 Float_t wmat[9]={1.,0.,0.,0.,1.,0.,0.,0.,1.};
357 if(sigmasq[0]!=0.) wmat[0]=1./sigmasq[0];
358 if(sigmasq[1]!=0.) wmat[4]=1./sigmasq[1];
359 if(sigmasq[2]!=0.) wmat[8]=1./sigmasq[2];
360 new(fLines[nolines++])AliStrLine(gc1,sigmasq,wmat,gc2,kTRUE,idClu1,idClu2);
363 fDetTypeRec->ResetRecPoints();
369 if(nolines == 0)return -2;
373 //______________________________________________________________________
374 Int_t AliITSVertexer3D::Prepare3DVertex(Int_t optCuts){
375 // Finds the 3D vertex information using tracklets
378 Float_t xbeam=GetNominalPos()[0];
379 Float_t ybeam=GetNominalPos()[1];
381 Float_t deltaR=fCoarseMaxRCut;
382 Float_t dZmax=fZCutDiamond;
384 xbeam=fVert3D.GetXv();
385 ybeam=fVert3D.GetYv();
386 zvert=fVert3D.GetZv();
389 }else if(optCuts==2){
390 xbeam=fVert3D.GetXv();
391 ybeam=fVert3D.GetYv();
396 Float_t rl=-fCoarseMaxRCut;
397 Float_t rh=fCoarseMaxRCut;
399 Float_t zl=-fZCutDiamond;
400 Float_t zh=fZCutDiamond;
401 Float_t binsizer=(rh-rl)/nbr;
402 Float_t binsizez=(zh-zl)/nbz;
403 TH3F *h3d = new TH3F("h3d","xyz distribution",nbr,rl,rh,nbr,rl,rh,nbz,zl,zh);
406 TH3F *h3dcs = new TH3F("h3dcs","xyz distribution",nbrcs,rl,rh,nbrcs,rl,rh,nbzcs,zl,zh);
408 // cleanup of the TCLonesArray of tracklets (i.e. fakes are removed)
409 Int_t *validate = new Int_t [fLines.GetEntriesFast()];
410 for(Int_t i=0; i<fLines.GetEntriesFast();i++)validate[i]=0;
411 for(Int_t i=0; i<fLines.GetEntriesFast()-1;i++){
412 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
413 for(Int_t j=i+1;j<fLines.GetEntriesFast();j++){
414 AliStrLine *l2 = (AliStrLine*)fLines.At(j);
415 Float_t dca=l1->GetDCA(l2);
416 if(dca > fDCAcut || dca<0.00001) continue;
418 Int_t retc = l1->Cross(l2,point);
420 Double_t deltaZ=point[2]-zvert;
421 if(TMath::Abs(deltaZ)>dZmax)continue;
422 Double_t rad=TMath::Sqrt(point[0]*point[0]+point[1]*point[1]);
423 if(rad>fCoarseMaxRCut)continue;
424 Double_t deltaX=point[0]-xbeam;
425 Double_t deltaY=point[1]-ybeam;
426 Double_t raddist=TMath::Sqrt(deltaX*deltaX+deltaY*deltaY);
427 if(raddist>deltaR)continue;
430 h3d->Fill(point[0],point[1],point[2]);
431 h3dcs->Fill(point[0],point[1],point[2]);
437 Int_t numbtracklets=0;
438 for(Int_t i=0; i<fLines.GetEntriesFast();i++)if(validate[i]>=1)numbtracklets++;
439 if(numbtracklets<2){delete [] validate; delete h3d; delete h3dcs; return retcode; }
441 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
442 if(validate[i]<1)fLines.RemoveAt(i);
445 AliDebug(1,Form("Number of tracklets (after compress)%d ",fLines.GetEntriesFast()));
448 // Find peaks in histos
450 Double_t peak[3]={0.,0.,0.};
452 FindPeaks(h3d,peak,ntrkl,ntimes);
455 if(optCuts==0 && ntrkl<=2){
458 FindPeaks(h3dcs,peak,ntrkl,ntimes);
459 binsizer=(rh-rl)/nbrcs;
460 binsizez=(zh-zl)/nbzcs;
461 if(ntrkl==1 || ntimes>1){delete h3dcs; return retcode;}
465 // Second selection loop
467 Float_t bs=(binsizer+binsizez)/2.;
468 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
469 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
470 if(l1->GetDistFromPoint(peak)>2.5*bs)fLines.RemoveAt(i);
473 AliDebug(1,Form("Number of tracklets (after 2nd compression) %d",fLines.GetEntriesFast()));
475 if(fLines.GetEntriesFast()>1){
476 // find a first candidate for the primary vertex
477 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
478 // make a further selection on tracklets based on this first candidate
479 fVert3D.GetXYZ(peak);
480 AliDebug(1,Form("FIRST V candidate: %f ; %f ; %f",peak[0],peak[1],peak[2]));
481 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
482 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
483 if(l1->GetDistFromPoint(peak)> fDCAcut)fLines.RemoveAt(i);
486 AliDebug(1,Form("Number of tracklets (after 3rd compression) %d",fLines.GetEntriesFast()));
487 if(fLines.GetEntriesFast()>1) retcode=0; // this new tracklet selection is used
488 else retcode =1; // the previous tracklet selection will be used
496 //________________________________________________________
497 void AliITSVertexer3D::SetMeanPPtSelTracks(Float_t fieldTesla){
498 // Sets mean values of P and Pt based on the field
499 if(TMath::Abs(fieldTesla-0.5)<0.01){
500 SetMeanPSelTracks(0.885);
501 SetMeanPtSelTracks(0.630);
502 }else if(TMath::Abs(fieldTesla-0.4)<0.01){
503 SetMeanPSelTracks(0.805);
504 SetMeanPtSelTracks(0.580);
505 }else if(TMath::Abs(fieldTesla-0.2)<0.01){
506 SetMeanPSelTracks(0.740);
507 SetMeanPtSelTracks(0.530);
508 }else if(fieldTesla<0.00001){
509 SetMeanPSelTracks(0.730);
510 SetMeanPtSelTracks(0.510);
513 SetMeanPtSelTracks();
517 //________________________________________________________
518 void AliITSVertexer3D::FindPeaks(TH3F* histo, Double_t *peak, Int_t &nOfTracklets, Int_t &nOfTimes){
519 // Finds bin with max contents in 3D histo of tracket intersections
520 TAxis *xax = histo->GetXaxis();
521 TAxis *yax = histo->GetYaxis();
522 TAxis *zax = histo->GetZaxis();
528 for(Int_t i=xax->GetFirst();i<=xax->GetLast();i++){
529 Float_t xval = xax->GetBinCenter(i);
530 for(Int_t j=yax->GetFirst();j<=yax->GetLast();j++){
531 Float_t yval = yax->GetBinCenter(j);
532 for(Int_t k=zax->GetFirst();k<=zax->GetLast();k++){
533 Float_t zval = zax->GetBinCenter(k);
534 Int_t bc =(Int_t)histo->GetBinContent(i,j,k);
541 }else if(bc==nOfTracklets){
549 //________________________________________________________
550 void AliITSVertexer3D::MarkUsedClusters(){
551 // Mark clusters of tracklets used in vertex claulation
552 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
553 AliStrLine *lin = (AliStrLine*)fLines.At(i);
554 Int_t idClu1=lin->GetIdPoint(0);
555 Int_t idClu2=lin->GetIdPoint(1);
556 fUsedCluster.SetBitNumber(idClu1);
557 fUsedCluster.SetBitNumber(idClu2);
560 //________________________________________________________
561 Int_t AliITSVertexer3D::RemoveTracklets(){
562 // Remove trackelts close to first found vertex
563 Double_t vert[3]={fVert3D.GetXv(),fVert3D.GetYv(),fVert3D.GetZv()};
565 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
566 AliStrLine *lin = (AliStrLine*)fLines.At(i);
567 if(lin->GetDistFromPoint(vert)<fDCAforPileup){
568 Int_t idClu1=lin->GetIdPoint(0);
569 Int_t idClu2=lin->GetIdPoint(1);
570 fUsedCluster.SetBitNumber(idClu1);
571 fUsedCluster.SetBitNumber(idClu2);
579 //________________________________________________________
580 void AliITSVertexer3D::FindOther3DVertices(TTree *itsClusterTree){
581 // pileup identification based on 3D vertexing with not used clusters
584 Int_t nolines = FindTracklets(itsClusterTree,2);
586 Int_t nr=RemoveTracklets();
589 Int_t rc=Prepare3DVertex(2);
591 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
592 if(fVert3D.GetNContributors()>=fMinTrackletsForPilup){
594 fZpuv=fVert3D.GetZv();
595 fNTrpuv=fVert3D.GetNContributors();
601 //______________________________________________________________________
602 void AliITSVertexer3D::PileupFromZ(){
603 // Calls the pileup algorithm of ALiITSVertexerZ
604 Int_t binmin, binmax;
605 Int_t nPeaks=AliITSVertexerZ::GetPeakRegion(fZHisto,binmin,binmax);
606 if(nPeaks==2)AliWarning("2 peaks found");
607 Int_t firstPeakCont=0;
608 Float_t firstPeakPos=0.;
609 for(Int_t i=binmin-1;i<=binmax+1;i++){
610 firstPeakCont+=fZHisto->GetBinContent(i);
611 firstPeakPos+=fZHisto->GetBinContent(i)*fZHisto->GetBinCenter(i);
613 firstPeakPos/=firstPeakCont;
615 if(firstPeakCont>fMinTrackletsForPilup){
617 ncontr2=AliITSVertexerZ::FindSecondPeak(fZHisto,binmin,binmax,secPeakPos);
618 if(ncontr2>=fMinTrackletsForPilup){
625 //________________________________________________________
626 void AliITSVertexer3D::PrintStatus() const {
627 // Print current status
628 printf("=======================================================\n");
629 printf("Loose cut on Delta Phi %f\n",fCoarseDiffPhiCut);
630 printf("Cut on tracklet DCA to Z axis %f\n",fCoarseMaxRCut);
631 printf("Cut on tracklet DCA to beam axis %f\n",fMaxRCut);
632 printf("Cut on diamond (Z) %f\n",fZCutDiamond);
633 printf("Cut on DCA - tracklet to tracklet and to vertex %f\n",fDCAcut);
634 printf("Max Phi difference: %f\n",fDiffPhiMax);
635 printf("Pileup algo: %d\n",fPileupAlgo);
636 printf("Min DCA to 1st vetrtex for pileup: %f\n",fDCAforPileup);
637 printf("=======================================================\n");