Store in AliVertex::fSigma the value of the DeltaPhi cut used in VertexerZ - can...
[u/mrichter/AliRoot.git] / ITS / AliITSVertexer3D.cxx
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70c95f95 1/**************************************************************************
2 * Copyright(c) 2006-2008, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
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 **************************************************************************/
70c95f95 15#include <TTree.h>
b21c1af0 16#include "AliRunLoader.h"
6a0d56b8 17#include "AliESDVertex.h"
cd706e57 18#include "AliLog.h"
6a0d56b8 19#include "AliStrLine.h"
20#include "AliTracker.h"
70c95f95 21#include "AliITSDetTypeRec.h"
22#include "AliITSRecPoint.h"
b21c1af0 23#include "AliITSRecPointContainer.h"
32e63e47 24#include "AliITSgeomTGeo.h"
6a0d56b8 25#include "AliVertexerTracks.h"
26#include "AliITSVertexer3D.h"
0b7bac55 27#include "AliITSVertexerZ.h"
6b4d9537 28#include "AliITSSortTrkl.h"
70c95f95 29/////////////////////////////////////////////////////////////////
30// this class implements a method to determine
31// the 3 coordinates of the primary vertex
9801e044 32// optimized for
33// p-p collisions
70c95f95 34////////////////////////////////////////////////////////////////
35
9801e044 36const Int_t AliITSVertexer3D::fgkMaxNumOfClDefault = 500;
37
70c95f95 38ClassImp(AliITSVertexer3D)
39
6a0d56b8 40/* $Id$ */
41
70c95f95 42//______________________________________________________________________
7d766abb 43AliITSVertexer3D::AliITSVertexer3D():
44 AliITSVertexer(),
45 fLines("AliStrLine",1000),
46 fVert3D(),
47 fCoarseDiffPhiCut(0.),
48 fFineDiffPhiCut(0.),
49 fCutOnPairs(0.),
50 fCoarseMaxRCut(0.),
51 fMaxRCut(0.),
87104b06 52 fMaxRCut2(0.),
7d766abb 53 fZCutDiamond(0.),
54 fMaxZCut(0.),
55 fDCAcut(0.),
56 fDiffPhiMax(0.),
57 fMeanPSelTrk(0.),
58 fMeanPtSelTrk(0.),
59 fUsedCluster(kMaxCluPerMod*kNSPDMod),
60 fZHisto(0),
61 fDCAforPileup(0.),
c238ba33 62 fDiffPhiforPileup(0.),
7d766abb 63 fBinSizeR(0.),
64 fBinSizeZ(0.),
9801e044 65 fPileupAlgo(0),
66 fMaxNumOfCl(fgkMaxNumOfClDefault)
6a0d56b8 67{
70c95f95 68 // Default constructor
69 SetCoarseDiffPhiCut();
6b4d9537 70 SetFineDiffPhiCut();
71 SetCutOnPairs();
05d1294c 72 SetCoarseMaxRCut();
70c95f95 73 SetMaxRCut();
87104b06 74 SetMaxRCutAlgo2();
70c95f95 75 SetZCutDiamond();
05d1294c 76 SetMaxZCut();
7203e11a 77 SetDCACut();
70c95f95 78 SetDiffPhiMax();
6a0d56b8 79 SetMeanPSelTracks();
80 SetMeanPtSelTracks();
cd1c2af1 81 SetMinDCAforPileup();
c238ba33 82 SetDeltaPhiforPileup();
cd1c2af1 83 SetPileupAlgo();
7d766abb 84 SetBinSizeR();
85 SetBinSizeZ();
242c8025 86 Double_t binsize=0.02; // default 200 micron
cd1c2af1 87 Int_t nbins=static_cast<Int_t>(1+2*fZCutDiamond/binsize);
88 fZHisto=new TH1F("hz","",nbins,-fZCutDiamond,-fZCutDiamond+binsize*nbins);
70c95f95 89}
90
70c95f95 91//______________________________________________________________________
92AliITSVertexer3D::~AliITSVertexer3D() {
93 // Destructor
f5f6da22 94 fLines.Clear("C");
cd1c2af1 95 if(fZHisto) delete fZHisto;
70c95f95 96}
97
27167524 98//______________________________________________________________________
99void AliITSVertexer3D::ResetVert3D(){
100 //
6b4d9537 101 ResetVertex();
27167524 102 fVert3D.SetXv(0.);
103 fVert3D.SetYv(0.);
104 fVert3D.SetZv(0.);
105 fVert3D.SetDispersion(0.);
106 fVert3D.SetNContributors(0);
cd1c2af1 107 fUsedCluster.ResetAllBits(0);
27167524 108}
70c95f95 109//______________________________________________________________________
308c2f7c 110AliESDVertex* AliITSVertexer3D::FindVertexForCurrentEvent(TTree *itsClusterTree){
70c95f95 111 // Defines the AliESDVertex for the current event
27167524 112 ResetVert3D();
308c2f7c 113 AliDebug(1,"FindVertexForCurrentEvent - 3D - PROCESSING NEXT EVENT");
6b4d9537 114 fLines.Clear("C");
115 fCurrentVertex = NULL;
70c95f95 116
308c2f7c 117 Int_t nolines = FindTracklets(itsClusterTree,0);
87104b06 118 Int_t rc;
0b7bac55 119 if(nolines>=2){
87104b06 120 rc=Prepare3DVertex(0);
121 if(fVert3D.GetNContributors()>0){
122 fLines.Clear("C");
46004624 123 nolines = FindTracklets(itsClusterTree,1);
87104b06 124 if(nolines>=2){
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
129 }
130 }
0b7bac55 131 }
6b4d9537 132
0b7bac55 133 if(!fCurrentVertex){
134 AliITSVertexerZ vertz(GetNominalPos()[0],GetNominalPos()[1]);
b96ee725 135 vertz.SetDetTypeRec(GetDetTypeRec());
0b7bac55 136 AliDebug(1,"Call Vertexer Z\n");
cc282e54 137 vertz.SetLowLimit(-fZCutDiamond);
138 vertz.SetHighLimit(fZCutDiamond);
0b7bac55 139 AliESDVertex* vtxz = vertz.FindVertexForCurrentEvent(itsClusterTree);
140 if(vtxz){
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);
bf2e0ad4 147 fCurrentVertex->SetDispersion(vtxz->GetDispersion());
0b7bac55 148 fCurrentVertex->SetTitle("vertexer: Z");
149 fCurrentVertex->SetName("SPDVertexZ");
150 delete vtxz;
0b7bac55 151 }
152
70c95f95 153 }
308c2f7c 154 FindMultiplicity(itsClusterTree);
70c95f95 155 return fCurrentVertex;
156}
157
6b4d9537 158//______________________________________________________________________
159void AliITSVertexer3D::FindVertex3D(TTree *itsClusterTree){
87104b06 160
0496a544 161 Double_t vRadius=TMath::Sqrt(fVert3D.GetXv()*fVert3D.GetXv()+fVert3D.GetYv()*fVert3D.GetYv());
6b4d9537 162 if(vRadius<GetPipeRadius() && fVert3D.GetNContributors()>0){
163 Double_t position[3]={fVert3D.GetXv(),fVert3D.GetYv(),fVert3D.GetZv()};
164 Double_t covmatrix[6];
165 fVert3D.GetCovMatrix(covmatrix);
166 Double_t chi2=99999.;
167 Int_t nContr=fVert3D.GetNContributors();
168 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
169 fCurrentVertex->SetTitle("vertexer: 3D");
170 fCurrentVertex->SetName("SPDVertex3D");
171 fCurrentVertex->SetDispersion(fVert3D.GetDispersion());
172 fNoVertices=1;
173
174 switch(fPileupAlgo){
175 case 0: PileupFromZ(); break;
176 case 1: FindOther3DVertices(itsClusterTree); break;
177 default: AliError("Wrong pileup algorithm"); break;
178 }
179 if(fNoVertices==1){
180 fVertArray = new AliESDVertex[1];
181 fVertArray[0]=(*fCurrentVertex);
182 }
183 }
184}
185
186//______________________________________________________________________
187void AliITSVertexer3D::FindVertex3DIterative(){
87104b06 188 //
189
190 Int_t nLines=fLines.GetEntriesFast();
191 Int_t maxPoints=nLines*(nLines-1)/2;
192 Double_t* xP=new Double_t[maxPoints];
193 Double_t* yP=new Double_t[maxPoints];
194 Double_t* zP=new Double_t[maxPoints];
195 Int_t* index1=new Int_t[maxPoints];
196 Int_t* index2=new Int_t[maxPoints];
197 Double_t xbeam=fVert3D.GetXv();
198 Double_t ybeam=fVert3D.GetYv();
199
200 Int_t iPoint=0;
201 for(Int_t ilin1=0; ilin1<nLines; ilin1++){
202 AliStrLine *l1 = (AliStrLine*)fLines.At(ilin1);
203 for(Int_t ilin2=ilin1+1; ilin2<nLines; ilin2++){
204 AliStrLine *l2 = (AliStrLine*)fLines.At(ilin2);
205 Double_t dca=l1->GetDCA(l2);
206 if(dca > fDCAcut || dca<0.00001) continue;
207 Double_t point[3];
208 Int_t retc = l1->Cross(l2,point);
209 if(retc<0)continue;
210 Double_t rad=TMath::Sqrt(point[0]*point[0]+point[1]*point[1]);
211 if(rad>fCoarseMaxRCut)continue;
212 Double_t distFromBeam=TMath::Sqrt((point[0]-xbeam)*(point[0]-xbeam)+(point[1]-ybeam)*(point[1]-ybeam));
213 if(distFromBeam>fMaxRCut2) continue;
214 xP[iPoint]=point[0];
215 yP[iPoint]=point[1];
216 zP[iPoint]=point[2];
217 index1[iPoint]=ilin1;
218 index2[iPoint]=ilin2;
219 iPoint++;
220 }
221 }
222 Int_t npoints=iPoint++;
223 Int_t index=0;
224 Short_t* mask=new Short_t[npoints];
225 for(Int_t ip=0;ip<npoints;ip++) mask[ip]=-1;
226
227 for(Int_t ip1=0;ip1<npoints;ip1++){
228 if(mask[ip1]==-1) mask[ip1]=index++;
229 for(Int_t ip2=ip1+1; ip2<npoints; ip2++){
230 if(mask[ip2]==mask[ip1] && mask[ip2]!=-1) continue;
231 Double_t dist2=(xP[ip1]-xP[ip2])*(xP[ip1]-xP[ip2]);
232 dist2+=(yP[ip1]-yP[ip2])*(yP[ip1]-yP[ip2]);
233 dist2+=(zP[ip1]-zP[ip2])*(zP[ip1]-zP[ip2]);
234 if(dist2<fCutOnPairs*fCutOnPairs){
235 if(mask[ip2]==-1) mask[ip2]=mask[ip1];
236 else{
237 for(Int_t ip=0; ip<npoints;ip++){
238 if(mask[ip]==mask[ip2]) mask[ip]=mask[ip1];
239 }
240 }
241 }
242 }
243 }
244
245
246 // Count multiplicity of trackelts in clusters
247 UInt_t* isIndUsed=new UInt_t[index+1];
248 for(Int_t ind=0;ind<index+1;ind++) isIndUsed[ind]=0;
249 for(Int_t ip=0; ip<npoints;ip++){
250 Int_t ind=mask[ip];
251 isIndUsed[ind]++;
252 }
253
254 // Count clusters/vertices and sort according to multiplicity
255 Int_t nClusters=0;
256 Int_t* sortedIndex=new Int_t[index+1];
257 for(Int_t ind1=0;ind1<index+1;ind1++){
258 if(isIndUsed[ind1]<=1) isIndUsed[ind1]=0;
259 else nClusters++;
260 UInt_t cap=9999999;
261 if(ind1>0) cap=isIndUsed[sortedIndex[ind1-1]];
262 UInt_t bigger=0;
263 Int_t biggerindex=-1;
264 for(Int_t ind2=0;ind2<index+1;ind2++){
265 Bool_t use=kTRUE;
266 for(Int_t ind3=0; ind3<ind1; ind3++)
267 if(ind2==sortedIndex[ind3]) use=kFALSE;
268 if(use && isIndUsed[ind2]>bigger && isIndUsed[ind2]<=cap){
269 bigger=isIndUsed[ind2];
270 biggerindex=ind2;
271 }
272 }
273 sortedIndex[ind1]=biggerindex;
274 }
275 AliDebug(3,Form("Number of clusters before merging = %d\n",nClusters));
276
277 // Assign lines to clusters/vertices and merge clusters which share 1 line
278 Int_t nClustersAfterMerge=nClusters;
279 Int_t* belongsTo=new Int_t[nLines];
280 for(Int_t ilin=0; ilin<nLines; ilin++) belongsTo[ilin]=-1;
281 for(Int_t iclu=0;iclu<nClusters;iclu++){
282 Int_t actualCluIndex=iclu;
283 for(Int_t ip=0; ip<npoints;ip++){
284 if(mask[ip]==sortedIndex[iclu]){
285 Int_t ind1=index1[ip];
286 if(belongsTo[ind1]==-1) belongsTo[ind1]=actualCluIndex;
287 else if(belongsTo[ind1]<actualCluIndex){
288 Int_t newCluIndex=belongsTo[ind1];
289 for(Int_t ilin=0; ilin<nLines; ilin++){
290 if(belongsTo[ilin]==actualCluIndex) belongsTo[ilin]=newCluIndex;
291 }
292 AliDebug(10,Form("Merged cluster %d with %d\n",actualCluIndex,newCluIndex));
293 actualCluIndex=newCluIndex;
294 nClustersAfterMerge--;
295 }
296 Int_t ind2=index2[ip];
297 if(belongsTo[ind2]==-1) belongsTo[ind2]=actualCluIndex;
298 else if(belongsTo[ind2]<actualCluIndex){
299 Int_t newCluIndex=belongsTo[ind2];
300 for(Int_t ilin=0; ilin<nLines; ilin++){
301 if(belongsTo[ilin]==actualCluIndex) belongsTo[ilin]=newCluIndex;
302 }
303 AliDebug(10,Form("Merged cluster %d with %d\n",actualCluIndex,newCluIndex));
304 actualCluIndex=newCluIndex;
305 nClustersAfterMerge--;
306 }
307 }
308 }
309 }
310 AliDebug(3,Form("Number of clusters after merging = %d\n",nClustersAfterMerge));
311
312 // Count lines associated to each cluster/vertex
313 UInt_t *cluSize=new UInt_t[nClusters];
314 for(Int_t iclu=0;iclu<nClusters;iclu++){
315 cluSize[iclu]=0;
316 for(Int_t ilin=0; ilin<nLines; ilin++){
317 if(belongsTo[ilin]==iclu) cluSize[iclu]++;
318 }
319 }
320
321 // Count good vertices (>1 associated tracklet)
322 UInt_t nGoodVert=0;
323 for(Int_t iclu=0;iclu<nClusters;iclu++){
324 AliDebug(3,Form("Vertex %d Size=%d\n",iclu,cluSize[iclu]));
325 if(cluSize[iclu]>1) nGoodVert++;
326 }
327
328 AliDebug(1,Form("Number of good vertices = %d\n",nGoodVert));
329 // Calculate vertex coordinates for each cluster
330 if(nGoodVert>0){
331 fVertArray = new AliESDVertex[nGoodVert];
332 Int_t iVert=0;
333 for(Int_t iclu=0;iclu<nClusters;iclu++){
334 Int_t size=cluSize[iclu];
335 if(size>1){
336 AliStrLine **arrlin = new AliStrLine*[size];
337 Int_t nFilled=0;
338 for(Int_t ilin=0; ilin<nLines; ilin++){
339 if(belongsTo[ilin]==iclu){
340 arrlin[nFilled++] = dynamic_cast<AliStrLine*>(fLines[ilin]);
341 }
342 }
343 AliDebug(3,Form("Vertex %d N associated tracklets = %d out of %d\n",iVert,size,nFilled));
344
345 fVertArray[iVert]=AliVertexerTracks::TrackletVertexFinder(arrlin,nFilled);
346 Double_t peak[3];
347 fVertArray[iVert].GetXYZ(peak);
348 AliStrLine **arrlin2 = new AliStrLine*[size];
349 Int_t nFilled2=0;
350 for(Int_t i=0; i<nFilled;i++){
351 AliStrLine *l1 = arrlin[i];
352 if(l1->GetDistFromPoint(peak)< fDCAcut)
353 arrlin2[nFilled2++] = dynamic_cast<AliStrLine*>(l1);
354 }
355 if(nFilled2>1){
356 AliDebug(3,Form("Vertex %d recalculated with %d tracklets\n",iVert,nFilled2));
357 fVertArray[iVert]=AliVertexerTracks::TrackletVertexFinder(arrlin2,nFilled2);
358 }
359 delete [] arrlin;
360 delete [] arrlin2;
361 ++iVert;
362 }
363 }
364
365 if(nGoodVert > 1){
366 fIsPileup = kTRUE;
367 fNTrpuv = fVertArray[1].GetNContributors();
368 fZpuv = fVertArray[1].GetZv();
369 }
370
371 Double_t vRadius=TMath::Sqrt(fVertArray[0].GetXv()*fVertArray[0].GetXv()+fVertArray[0].GetYv()*fVertArray[0].GetYv());
372 if(vRadius<GetPipeRadius() && fVertArray[0].GetNContributors()>0){
373 Double_t position[3]={fVertArray[0].GetXv(),fVertArray[0].GetYv(),fVertArray[0].GetZv()};
374 Double_t covmatrix[6];
375 fVertArray[0].GetCovMatrix(covmatrix);
376 Double_t chi2=99999.;
377 Int_t nContr=fVertArray[0].GetNContributors();
378 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
379 fCurrentVertex->SetTitle("vertexer: 3D");
380 fCurrentVertex->SetName("SPDVertex3D");
381 fCurrentVertex->SetDispersion(fVertArray[0].GetDispersion());
382 }
383 }
384
385 delete [] index1;
386 delete [] index2;
387 delete [] mask;
388 delete [] isIndUsed;
389 delete [] sortedIndex;
390 delete [] belongsTo;
391 delete [] cluSize;
392 delete [] xP;
393 delete [] yP;
394 delete [] zP;
395}
396//______________________________________________________________________
397void AliITSVertexer3D::FindVertex3DIterativeMM(){
6b4d9537 398 // Defines the AliESDVertex for the current event
399 Int_t numsor=fLines.GetEntriesFast()*(fLines.GetEntriesFast()-1)/2;
400 //cout<<"AliITSVertexer3D::FindVertexForCurentEvent: Number of tracklets selected for vertexing "<<fLines.GetEntriesFast()<<"; Number of pairs: "<<numsor<<endl;
401 AliITSSortTrkl srt(fLines,numsor,fCutOnPairs,fCoarseMaxRCut);
402 srt.FindClusters();
403 AliInfo(Form("Number of vertices: %d",srt.GetNumberOfClusters()));
404
405 fNoVertices = srt.GetNumberOfClusters();
406 //printf("fNoVertices = %d \n",fNoVertices);
407 if(fNoVertices>0){
408 fVertArray = new AliESDVertex[fNoVertices];
409 for(Int_t kk=0; kk<srt.GetNumberOfClusters(); kk++){
410 Int_t size = 0;
411 Int_t *labels = srt.GetTrackletsLab(kk,size);
412 /*
413 Int_t *pairs = srt.GetClusters(kk);
414 Int_t nopai = srt.GetSizeOfCluster(kk);
415 cout<<"***** Vertex number "<<kk<<". Pairs: \n";
416 for(Int_t jj=0;jj<nopai;jj++){
417 cout<<pairs[jj]<<" - ";
418 if(jj>0 & jj%8==0)cout<<endl;
419 }
420 cout<<endl;
421 cout<<"***** Vertex number "<<kk<<". Labels: \n";
422 */
423 AliStrLine **tclo = new AliStrLine* [size];
424 for(Int_t jj=0;jj<size;jj++){
425 // cout<<labels[jj]<<" - ";
426 // if(jj>0 & jj%8==0)cout<<endl;
427 tclo[jj] = dynamic_cast<AliStrLine*>(fLines[labels[jj]]);
428 }
429 // cout<<endl;
430 delete []labels;
431 fVertArray[kk]=AliVertexerTracks::TrackletVertexFinder(tclo,size);
432 delete [] tclo;
433 // fVertArray[kk].PrintStatus();
434 if(kk == 1){
435 // at least one second vertex is present
436 fIsPileup = kTRUE;
437 fNTrpuv = fVertArray[kk].GetNContributors();
438 fZpuv = fVertArray[kk].GetZv();
439 }
440 }
0496a544 441 Double_t vRadius=TMath::Sqrt(fVertArray[0].GetXv()*fVertArray[0].GetXv()+fVertArray[0].GetYv()*fVertArray[0].GetYv());
6b4d9537 442 if(vRadius<GetPipeRadius() && fVertArray[0].GetNContributors()>0){
443 Double_t position[3]={fVertArray[0].GetXv(),fVertArray[0].GetYv(),fVertArray[0].GetZv()};
444 Double_t covmatrix[6];
445 fVertArray[0].GetCovMatrix(covmatrix);
446 Double_t chi2=99999.;
447 Int_t nContr=fVertArray[0].GetNContributors();
448 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
449 fCurrentVertex->SetTitle("vertexer: 3D");
450 fCurrentVertex->SetName("SPDVertex3D");
451 fCurrentVertex->SetDispersion(fVertArray[0].GetDispersion());
452 }
453 }
454
455}
456
457//______________________________________________________________________
458Bool_t AliITSVertexer3D::DistBetweenVertices(AliESDVertex &a, AliESDVertex &b, Double_t test, Double_t &dist){
459 // method to compare the distance between vertices a and b with "test"
460 //it returns kTRUE is the distance is less or equal to test
461 dist = (a.GetX()-b.GetX()) * (a.GetX()-b.GetX());
462 dist += (a.GetY()-b.GetY()) * (a.GetY()-b.GetY());
463 dist += (a.GetZ()-b.GetZ()) * (a.GetZ()-b.GetZ());
464 dist = TMath::Sqrt(dist);
465 if(dist <= test)return kTRUE;
466 return kFALSE;
467}
468
469
70c95f95 470//______________________________________________________________________
308c2f7c 471Int_t AliITSVertexer3D::FindTracklets(TTree *itsClusterTree, Int_t optCuts){
70c95f95 472 // All the possible combinations between recpoints on layer 1and 2 are
473 // considered. Straight lines (=tracklets)are formed.
474 // The tracklets are processed in Prepare3DVertex
70c95f95 475
70c95f95 476 TClonesArray *itsRec = 0;
cd1c2af1 477 if(optCuts==0) fZHisto->Reset();
6b4d9537 478 // gc1 are local and global coordinates for layer 1
0496a544 479 Float_t gc1f[3]={0.,0.,0.};
480 Double_t gc1[3]={0.,0.,0.};
6b4d9537 481 // gc2 are local and global coordinates for layer 2
0496a544 482 Float_t gc2f[3]={0.,0.,0.};
483 Double_t gc2[3]={0.,0.,0.};
b21c1af0 484 AliITSRecPointContainer* rpcont=AliITSRecPointContainer::Instance();
485 itsRec=rpcont->FetchClusters(0,itsClusterTree);
486 if(!rpcont->IsSPDActive()){
487 AliWarning("No SPD rec points found, 3D vertex not calculated");
6b4d9537 488 return -1;
489 }
70c95f95 490
491 // Set values for cuts
0496a544 492 Double_t xbeam=GetNominalPos()[0];
493 Double_t ybeam=GetNominalPos()[1];
494 Double_t zvert=0.;
495 Double_t deltaPhi=fCoarseDiffPhiCut;
496 Double_t deltaR=fCoarseMaxRCut;
497 Double_t dZmax=fZCutDiamond;
87104b06 498 if(optCuts==1){
27167524 499 xbeam=fVert3D.GetXv();
500 ybeam=fVert3D.GetYv();
501 zvert=fVert3D.GetZv();
70c95f95 502 deltaPhi = fDiffPhiMax;
05d1294c 503 deltaR=fMaxRCut;
504 dZmax=fMaxZCut;
87104b06 505 if(fPileupAlgo == 2){
506 dZmax=fZCutDiamond;
507 deltaR=fMaxRCut2;
508 }
6b4d9537 509 } else if(optCuts==2){
cd1c2af1 510 xbeam=fVert3D.GetXv();
511 ybeam=fVert3D.GetYv();
c238ba33 512 deltaPhi = fDiffPhiforPileup;
cd1c2af1 513 deltaR=fMaxRCut;
70c95f95 514 }
cd1c2af1 515
70c95f95 516 Int_t nrpL1 = 0; // number of rec points on layer 1
517 Int_t nrpL2 = 0; // number of rec points on layer 2
518
519 // By default irstL1=0 and lastL1=79
6a0d56b8 520 Int_t firstL1 = AliITSgeomTGeo::GetModuleIndex(1,1,1);
32e63e47 521 Int_t lastL1 = AliITSgeomTGeo::GetModuleIndex(2,1,1)-1;
6a0d56b8 522 for(Int_t module= firstL1; module<=lastL1;module++){ // count number of recopints on layer 1
b21c1af0 523 itsRec=rpcont->UncheckedGetClusters(module);
70c95f95 524 nrpL1+= itsRec->GetEntries();
70c95f95 525 }
6a0d56b8 526 //By default firstL2=80 and lastL2=239
527 Int_t firstL2 = AliITSgeomTGeo::GetModuleIndex(2,1,1);
32e63e47 528 Int_t lastL2 = AliITSgeomTGeo::GetModuleIndex(3,1,1)-1;
6a0d56b8 529 for(Int_t module= firstL2; module<=lastL2;module++){ // count number of recopints on layer 2
b21c1af0 530 itsRec=rpcont->UncheckedGetClusters(module);
70c95f95 531 nrpL2+= itsRec->GetEntries();
70c95f95 532 }
533 if(nrpL1 == 0 || nrpL2 == 0){
fea0ad94 534 AliDebug(1,Form("No RecPoints in at least one SPD layer (%d %d)",nrpL1,nrpL2));
70c95f95 535 return -1;
536 }
cd706e57 537 AliDebug(1,Form("RecPoints on Layer 1,2 = %d, %d\n",nrpL1,nrpL2));
9801e044 538 if(nrpL1>fMaxNumOfCl || nrpL2>fMaxNumOfCl){
539 AliWarning(Form("Too many recpoints on SPD(%d %d ), call vertexerZ",nrpL1,nrpL2));
540 return -1;
541 }
70c95f95 542
543 Double_t a[3]={xbeam,ybeam,0.};
544 Double_t b[3]={xbeam,ybeam,10.};
545 AliStrLine zeta(a,b,kTRUE);
322e007a 546 static Double_t bField=TMath::Abs(AliTracker::GetBz()/10.); //T
6a0d56b8 547 SetMeanPPtSelTracks(bField);
87104b06 548
70c95f95 549 Int_t nolines = 0;
550 // Loop on modules of layer 1
6a0d56b8 551 for(Int_t modul1= firstL1; modul1<=lastL1;modul1++){ // Loop on modules of layer 1
8c42830a 552 if(!fUseModule[modul1]) continue;
27167524 553 UShort_t ladder=int(modul1/4)+1; // ladders are numbered starting from 1
b21c1af0 554 TClonesArray *prpl1=rpcont->UncheckedGetClusters(modul1);
555 Int_t nrecp1 = prpl1->GetEntries();
70c95f95 556 for(Int_t j=0;j<nrecp1;j++){
cd1c2af1 557 if(j>kMaxCluPerMod) continue;
558 UShort_t idClu1=modul1*kMaxCluPerMod+j;
559 if(fUsedCluster.TestBitNumber(idClu1)) continue;
b21c1af0 560 AliITSRecPoint *recp1 = (AliITSRecPoint*)prpl1->At(j);
0496a544 561 recp1->GetGlobalXYZ(gc1f);
562 for(Int_t ico=0;ico<3;ico++)gc1[ico]=gc1f[ico];
563
6a0d56b8 564 Double_t phi1 = TMath::ATan2(gc1[1]-ybeam,gc1[0]-xbeam);
70c95f95 565 if(phi1<0)phi1=2*TMath::Pi()+phi1;
27167524 566 for(Int_t ladl2=0 ; ladl2<fLadOnLay2*2+1;ladl2++){
567 for(Int_t k=0;k<4;k++){
568 Int_t ladmod=fLadders[ladder-1]+ladl2;
32e63e47 569 if(ladmod>AliITSgeomTGeo::GetNLadders(2)) ladmod=ladmod-AliITSgeomTGeo::GetNLadders(2);
570 Int_t modul2=AliITSgeomTGeo::GetModuleIndex(2,ladmod,k+1);
8c42830a 571 if(!fUseModule[modul2]) continue;
b21c1af0 572 itsRec=rpcont->UncheckedGetClusters(modul2);
27167524 573 Int_t nrecp2 = itsRec->GetEntries();
574 for(Int_t j2=0;j2<nrecp2;j2++){
cd1c2af1 575 if(j2>kMaxCluPerMod) continue;
576 UShort_t idClu2=modul2*kMaxCluPerMod+j2;
577 if(fUsedCluster.TestBitNumber(idClu2)) continue;
6a0d56b8 578 AliITSRecPoint *recp2 = (AliITSRecPoint*)itsRec->At(j2);
0496a544 579 recp2->GetGlobalXYZ(gc2f);
580 for(Int_t ico=0;ico<3;ico++)gc2[ico]=gc2f[ico];
27167524 581 Double_t phi2 = TMath::ATan2(gc2[1]-ybeam,gc2[0]-xbeam);
582 if(phi2<0)phi2=2*TMath::Pi()+phi2;
583 Double_t diff = TMath::Abs(phi2-phi1);
584 if(diff>TMath::Pi())diff=2.*TMath::Pi()-diff;
54091147 585 if(optCuts==0 && diff<fDiffPhiforPileup){
0496a544 586 Double_t r1=TMath::Sqrt(gc1[0]*gc1[0]+gc1[1]*gc1[1]);
587 Double_t zc1=gc1[2];
588 Double_t r2=TMath::Sqrt(gc2[0]*gc2[0]+gc2[1]*gc2[1]);
589 Double_t zc2=gc2[2];
590 Double_t zr0=(r2*zc1-r1*zc2)/(r2-r1); //Z @ null radius
cd1c2af1 591 fZHisto->Fill(zr0);
592 }
27167524 593 if(diff>deltaPhi)continue;
6a0d56b8 594 AliStrLine line(gc1,gc2,kTRUE);
27167524 595 Double_t cp[3];
596 Int_t retcode = line.Cross(&zeta,cp);
597 if(retcode<0)continue;
598 Double_t dca = line.GetDCA(&zeta);
599 if(dca<0.) continue;
600 if(dca>deltaR)continue;
601 Double_t deltaZ=cp[2]-zvert;
602 if(TMath::Abs(deltaZ)>dZmax)continue;
6a0d56b8 603
6a0d56b8 604 if(nolines == 0){
f5f6da22 605 if(fLines.GetEntriesFast()>0)fLines.Clear("C");
6a0d56b8 606 }
607 Float_t cov[6];
608 recp2->GetGlobalCov(cov);
609
cd1c2af1 610
0496a544 611 Double_t rad1=TMath::Sqrt(gc1[0]*gc1[0]+gc1[1]*gc1[1]);
612 Double_t rad2=TMath::Sqrt(gc2[0]*gc2[0]+gc2[1]*gc2[1]);
613 Double_t factor=(rad1+rad2)/(rad2-rad1); //factor to account for error on tracklet direction
6a0d56b8 614
0496a544 615 Double_t curvErr=0;
6a0d56b8 616 if(bField>0.00001){
0496a544 617 Double_t curvRadius=fMeanPtSelTrk/(0.3*bField)*100; //cm
440198c1 618 Double_t dRad=TMath::Sqrt((gc1[0]-gc2[0])*(gc1[0]-gc2[0])+(gc1[1]-gc2[1])*(gc1[1]-gc2[1]));
0496a544 619 Double_t aux=dRad/2.+rad1;
6a0d56b8 620 curvErr=TMath::Sqrt(curvRadius*curvRadius-dRad*dRad/4.)-TMath::Sqrt(curvRadius*curvRadius-aux*aux); //cm
621 }
0496a544 622 Double_t sigmasq[3];
6a0d56b8 623 sigmasq[0]=(cov[0]+curvErr*curvErr/2.)*factor*factor;
624 sigmasq[1]=(cov[3]+curvErr*curvErr/2.)*factor*factor;
625 sigmasq[2]=cov[5]*factor*factor;
626
627 // Multiple scattering
0496a544 628 Double_t pOverMass=fMeanPSelTrk/0.140;
629 Double_t beta2=pOverMass*pOverMass/(1+pOverMass*pOverMass);
630 Double_t p2=fMeanPSelTrk*fMeanPSelTrk;
631 Double_t rBP=GetPipeRadius();
632 Double_t dBP=0.08/35.3; // 800 um of Be
633 Double_t dL1=0.01; //approx. 1% of radiation length
634 Double_t theta2BP=14.1*14.1/(beta2*p2*1e6)*dBP;
635 Double_t theta2L1=14.1*14.1/(beta2*p2*1e6)*dL1;
636 Double_t rtantheta1=(rad2-rad1)*TMath::Tan(TMath::Sqrt(theta2L1));
637 Double_t rtanthetaBP=(rad1-rBP)*TMath::Tan(TMath::Sqrt(theta2BP));
6a0d56b8 638 for(Int_t ico=0; ico<3;ico++){
5951029f 639 sigmasq[ico]+=rtantheta1*rtantheta1*factor*factor/3.;
640 sigmasq[ico]+=rtanthetaBP*rtanthetaBP*factor*factor/3.;
6a0d56b8 641 }
0496a544 642 Double_t wmat[9]={1.,0.,0.,0.,1.,0.,0.,0.,1.};
6a0d56b8 643 if(sigmasq[0]!=0.) wmat[0]=1./sigmasq[0];
644 if(sigmasq[1]!=0.) wmat[4]=1./sigmasq[1];
645 if(sigmasq[2]!=0.) wmat[8]=1./sigmasq[2];
cd1c2af1 646 new(fLines[nolines++])AliStrLine(gc1,sigmasq,wmat,gc2,kTRUE,idClu1,idClu2);
6a0d56b8 647
27167524 648 }
70c95f95 649 }
70c95f95 650 }
651 }
70c95f95 652 }
653 if(nolines == 0)return -2;
654 return nolines;
655}
656
70c95f95 657//______________________________________________________________________
05d1294c 658Int_t AliITSVertexer3D::Prepare3DVertex(Int_t optCuts){
70c95f95 659 // Finds the 3D vertex information using tracklets
660 Int_t retcode = -1;
661
0496a544 662 Double_t xbeam=GetNominalPos()[0];
663 Double_t ybeam=GetNominalPos()[1];
664 Double_t zvert=0.;
665 Double_t deltaR=fCoarseMaxRCut;
0496a544 666 Double_t dZmax=fZCutDiamond;
cd1c2af1 667 if(optCuts==1){
27167524 668 xbeam=fVert3D.GetXv();
669 ybeam=fVert3D.GetYv();
670 zvert=fVert3D.GetZv();
05d1294c 671 deltaR=fMaxRCut;
672 dZmax=fMaxZCut;
87104b06 673 if(fPileupAlgo == 2){
674 dZmax=fZCutDiamond;
675 deltaR=fMaxRCut2;
676 }
cd1c2af1 677 }else if(optCuts==2){
678 xbeam=fVert3D.GetXv();
679 ybeam=fVert3D.GetYv();
680 deltaR=fMaxRCut;
05d1294c 681 }
682
0496a544 683 Double_t rl=-fCoarseMaxRCut;
684 Double_t rh=fCoarseMaxRCut;
685 Double_t zl=-fZCutDiamond;
686 Double_t zh=fZCutDiamond;
7d766abb 687 Int_t nbr=(Int_t)((rh-rl)/fBinSizeR+0.0001);
688 Int_t nbz=(Int_t)((zh-zl)/fBinSizeZ+0.0001);
689 Int_t nbrcs=(Int_t)((rh-rl)/(fBinSizeR*2.)+0.0001);
690 Int_t nbzcs=(Int_t)((zh-zl)/(fBinSizeZ*2.)+0.0001);
691
87104b06 692 TH3F *h3d = new TH3F("h3d","xyz distribution",nbr,rl,rh,nbr,rl,rh,nbz,zl,zh);
693 TH3F *h3dcs = new TH3F("h3dcs","xyz distribution",nbrcs,rl,rh,nbrcs,rl,rh,nbzcs,zl,zh);
694
70c95f95 695 // cleanup of the TCLonesArray of tracklets (i.e. fakes are removed)
f5f6da22 696 Int_t *validate = new Int_t [fLines.GetEntriesFast()];
697 for(Int_t i=0; i<fLines.GetEntriesFast();i++)validate[i]=0;
698 for(Int_t i=0; i<fLines.GetEntriesFast()-1;i++){
f5f6da22 699 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
700 for(Int_t j=i+1;j<fLines.GetEntriesFast();j++){
701 AliStrLine *l2 = (AliStrLine*)fLines.At(j);
0496a544 702 Double_t dca=l1->GetDCA(l2);
05d1294c 703 if(dca > fDCAcut || dca<0.00001) continue;
70c95f95 704 Double_t point[3];
705 Int_t retc = l1->Cross(l2,point);
706 if(retc<0)continue;
6a0d56b8 707 Double_t deltaZ=point[2]-zvert;
708 if(TMath::Abs(deltaZ)>dZmax)continue;
70c95f95 709 Double_t rad=TMath::Sqrt(point[0]*point[0]+point[1]*point[1]);
05d1294c 710 if(rad>fCoarseMaxRCut)continue;
711 Double_t deltaX=point[0]-xbeam;
712 Double_t deltaY=point[1]-ybeam;
05d1294c 713 Double_t raddist=TMath::Sqrt(deltaX*deltaX+deltaY*deltaY);
05d1294c 714 if(raddist>deltaR)continue;
27167524 715 validate[i]=1;
716 validate[j]=1;
87104b06 717 h3d->Fill(point[0],point[1],point[2]);
718 h3dcs->Fill(point[0],point[1],point[2]);
70c95f95 719 }
720 }
721
722
723
70c95f95 724 Int_t numbtracklets=0;
f5f6da22 725 for(Int_t i=0; i<fLines.GetEntriesFast();i++)if(validate[i]>=1)numbtracklets++;
6b4d9537 726 if(numbtracklets<2){
727 delete [] validate;
87104b06 728 delete h3d;
729 delete h3dcs;
6b4d9537 730 return retcode;
731 }
70c95f95 732
f5f6da22 733 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
734 if(validate[i]<1)fLines.RemoveAt(i);
70c95f95 735 }
f5f6da22 736 fLines.Compress();
737 AliDebug(1,Form("Number of tracklets (after compress)%d ",fLines.GetEntriesFast()));
70c95f95 738 delete [] validate;
739
87104b06 740 // Exit here if Pileup Algorithm 2 has been chosen during second loop
741 if(fPileupAlgo == 2 && optCuts==1){
742 delete h3d;
743 delete h3dcs;
744 return 0;
745 }
6b4d9537 746
7340864d 747 // Find peaks in histos
05d1294c 748
70c95f95 749 Double_t peak[3]={0.,0.,0.};
7340864d 750 Int_t ntrkl,ntimes;
751 FindPeaks(h3d,peak,ntrkl,ntimes);
70c95f95 752 delete h3d;
0496a544 753 Double_t binsizer=(rh-rl)/nbr;
754 Double_t binsizez=(zh-zl)/nbz;
7d766abb 755 if(optCuts==0 && (ntrkl<=2 || ntimes>1)){
7340864d 756 ntrkl=0;
757 ntimes=0;
758 FindPeaks(h3dcs,peak,ntrkl,ntimes);
759 binsizer=(rh-rl)/nbrcs;
760 binsizez=(zh-zl)/nbzcs;
761 if(ntrkl==1 || ntimes>1){delete h3dcs; return retcode;}
762 }
763 delete h3dcs;
764
70c95f95 765 // Second selection loop
7340864d 766
0496a544 767 Double_t bs=(binsizer+binsizez)/2.;
f5f6da22 768 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
769 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
770 if(l1->GetDistFromPoint(peak)>2.5*bs)fLines.RemoveAt(i);
70c95f95 771 }
f5f6da22 772 fLines.Compress();
773 AliDebug(1,Form("Number of tracklets (after 2nd compression) %d",fLines.GetEntriesFast()));
70c95f95 774
f5f6da22 775 if(fLines.GetEntriesFast()>1){
2ecf7a6f 776 retcode=0;
27167524 777 // find a first candidate for the primary vertex
f5f6da22 778 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
70c95f95 779 // make a further selection on tracklets based on this first candidate
27167524 780 fVert3D.GetXYZ(peak);
781 AliDebug(1,Form("FIRST V candidate: %f ; %f ; %f",peak[0],peak[1],peak[2]));
f5f6da22 782 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
783 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
784 if(l1->GetDistFromPoint(peak)> fDCAcut)fLines.RemoveAt(i);
70c95f95 785 }
f5f6da22 786 fLines.Compress();
787 AliDebug(1,Form("Number of tracklets (after 3rd compression) %d",fLines.GetEntriesFast()));
2ecf7a6f 788 if(fLines.GetEntriesFast()>1){// this new tracklet selection is used
789 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
790 }
70c95f95 791 }
792 return retcode;
793}
794
6a0d56b8 795//________________________________________________________
0496a544 796void AliITSVertexer3D::SetMeanPPtSelTracks(Double_t fieldTesla){
5951029f 797 // Sets mean values of Pt based on the field
798 // for P (used in multiple scattering) the most probable value is used
6a0d56b8 799 if(TMath::Abs(fieldTesla-0.5)<0.01){
5951029f 800 SetMeanPSelTracks(0.375);
6a0d56b8 801 SetMeanPtSelTracks(0.630);
802 }else if(TMath::Abs(fieldTesla-0.4)<0.01){
5951029f 803 SetMeanPSelTracks(0.375);
6a0d56b8 804 SetMeanPtSelTracks(0.580);
805 }else if(TMath::Abs(fieldTesla-0.2)<0.01){
5951029f 806 SetMeanPSelTracks(0.375);
6a0d56b8 807 SetMeanPtSelTracks(0.530);
808 }else if(fieldTesla<0.00001){
5951029f 809 SetMeanPSelTracks(0.375);
810 SetMeanPtSelTracks(0.230);
6a0d56b8 811 }else{
812 SetMeanPSelTracks();
813 SetMeanPtSelTracks();
70c95f95 814 }
70c95f95 815}
816
7340864d 817//________________________________________________________
818void AliITSVertexer3D::FindPeaks(TH3F* histo, Double_t *peak, Int_t &nOfTracklets, Int_t &nOfTimes){
819 // Finds bin with max contents in 3D histo of tracket intersections
820 TAxis *xax = histo->GetXaxis();
821 TAxis *yax = histo->GetYaxis();
822 TAxis *zax = histo->GetZaxis();
823 peak[0]=0.;
824 peak[1]=0.;
825 peak[2]=0.;
826 nOfTracklets = 0;
827 nOfTimes=0;
7d766abb 828 Int_t peakbin[3]={0,0,0};
829 Int_t peak2bin[3]={-1,-1,-1};
830 Int_t bc2=-1;
7340864d 831 for(Int_t i=xax->GetFirst();i<=xax->GetLast();i++){
242c8025 832 Double_t xval = xax->GetBinCenter(i);
7340864d 833 for(Int_t j=yax->GetFirst();j<=yax->GetLast();j++){
242c8025 834 Double_t yval = yax->GetBinCenter(j);
7340864d 835 for(Int_t k=zax->GetFirst();k<=zax->GetLast();k++){
242c8025 836 Double_t zval = zax->GetBinCenter(k);
7340864d 837 Int_t bc =(Int_t)histo->GetBinContent(i,j,k);
7d766abb 838 if(bc==0) continue;
7340864d 839 if(bc>nOfTracklets){
7d766abb 840 nOfTracklets=bc;
7340864d 841 peak[2] = zval;
842 peak[1] = yval;
843 peak[0] = xval;
7d766abb 844 peakbin[2] = k;
845 peakbin[1] = j;
846 peakbin[0] = i;
847 peak2bin[2] = -1;
848 peak2bin[1] = -1;
849 peak2bin[0] = -1;
850 bc2=-1;
7340864d 851 nOfTimes = 1;
06a7cbee 852 }else if(bc==nOfTracklets){
7d766abb 853 if(TMath::Abs(i-peakbin[0])<=1 && TMath::Abs(j-peakbin[1])<=1 && TMath::Abs(k-peakbin[2])<=1){
854 peak2bin[2] = k;
855 peak2bin[1] = j;
856 peak2bin[0] = i;
857 bc2=bc;
858 nOfTimes = 1;
859 }else{
860 nOfTimes++;
861 }
7340864d 862 }
863 }
864 }
865 }
7d766abb 866 if(peak2bin[0]>=-1 && bc2!=-1){ // two contiguous peak-cells with same contents
867 peak[0]=0.5*(xax->GetBinCenter(peakbin[0])+xax->GetBinCenter(peak2bin[0]));
868 peak[1]=0.5*(yax->GetBinCenter(peakbin[1])+yax->GetBinCenter(peak2bin[1]));
869 peak[2]=0.5*(zax->GetBinCenter(peakbin[2])+zax->GetBinCenter(peak2bin[2]));
870 nOfTracklets+=bc2;
871 nOfTimes=1;
872 }
7340864d 873}
cd1c2af1 874//________________________________________________________
875void AliITSVertexer3D::MarkUsedClusters(){
876 // Mark clusters of tracklets used in vertex claulation
877 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
878 AliStrLine *lin = (AliStrLine*)fLines.At(i);
879 Int_t idClu1=lin->GetIdPoint(0);
880 Int_t idClu2=lin->GetIdPoint(1);
881 fUsedCluster.SetBitNumber(idClu1);
882 fUsedCluster.SetBitNumber(idClu2);
883 }
884}
885//________________________________________________________
886Int_t AliITSVertexer3D::RemoveTracklets(){
887 // Remove trackelts close to first found vertex
888 Double_t vert[3]={fVert3D.GetXv(),fVert3D.GetYv(),fVert3D.GetZv()};
889 Int_t nRemoved=0;
890 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
891 AliStrLine *lin = (AliStrLine*)fLines.At(i);
892 if(lin->GetDistFromPoint(vert)<fDCAforPileup){
893 Int_t idClu1=lin->GetIdPoint(0);
894 Int_t idClu2=lin->GetIdPoint(1);
895 fUsedCluster.SetBitNumber(idClu1);
896 fUsedCluster.SetBitNumber(idClu2);
897 fLines.RemoveAt(i);
898 ++nRemoved;
899 }
900 }
901 fLines.Compress();
902 return nRemoved;
903}
904//________________________________________________________
905void AliITSVertexer3D::FindOther3DVertices(TTree *itsClusterTree){
906 // pileup identification based on 3D vertexing with not used clusters
907 MarkUsedClusters();
908 fLines.Clear("C");
909 Int_t nolines = FindTracklets(itsClusterTree,2);
910 if(nolines>=2){
911 Int_t nr=RemoveTracklets();
912 nolines-=nr;
913 if(nolines>=2){
914 Int_t rc=Prepare3DVertex(2);
915 if(rc==0){
916 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
917 if(fVert3D.GetNContributors()>=fMinTrackletsForPilup){
918 fIsPileup=kTRUE;
6b4d9537 919 fNoVertices=2;
920 fVertArray = new AliESDVertex[2];
921 fVertArray[0]=(*fCurrentVertex);
922 fVertArray[1]=fVert3D;
cd1c2af1 923 fZpuv=fVert3D.GetZv();
924 fNTrpuv=fVert3D.GetNContributors();
925 }
926 }
927 }
928 }
929}
930//______________________________________________________________________
931void AliITSVertexer3D::PileupFromZ(){
932 // Calls the pileup algorithm of ALiITSVertexerZ
933 Int_t binmin, binmax;
934 Int_t nPeaks=AliITSVertexerZ::GetPeakRegion(fZHisto,binmin,binmax);
935 if(nPeaks==2)AliWarning("2 peaks found");
936 Int_t firstPeakCont=0;
242c8025 937 Double_t firstPeakPos=0.;
cd1c2af1 938 for(Int_t i=binmin-1;i<=binmax+1;i++){
6b4d9537 939 firstPeakCont+=static_cast<Int_t>(fZHisto->GetBinContent(i));
cd1c2af1 940 firstPeakPos+=fZHisto->GetBinContent(i)*fZHisto->GetBinCenter(i);
941 }
73315c4a 942 if(firstPeakCont>0){
943 firstPeakPos/=firstPeakCont;
944 Int_t ncontr2=0;
945 if(firstPeakCont>fMinTrackletsForPilup){
946 Float_t secPeakPos;
947 ncontr2=AliITSVertexerZ::FindSecondPeak(fZHisto,binmin,binmax,secPeakPos);
948 if(ncontr2>=fMinTrackletsForPilup){
949 fIsPileup=kTRUE;
6b4d9537 950 fNoVertices=2;
951 AliESDVertex secondVert(secPeakPos,0.1,ncontr2);
952 fVertArray = new AliESDVertex[2];
953 fVertArray[0]=(*fCurrentVertex);
954 fVertArray[1]=secondVert;
73315c4a 955 fZpuv=secPeakPos;
956 fNTrpuv=ncontr2;
957 }
cd1c2af1 958 }
959 }
960}
70c95f95 961//________________________________________________________
962void AliITSVertexer3D::PrintStatus() const {
963 // Print current status
87104b06 964 printf("========= First step selections =====================\n");
6a0d56b8 965 printf("Cut on diamond (Z) %f\n",fZCutDiamond);
87104b06 966 printf("Loose cut on Delta Phi %f\n",fCoarseDiffPhiCut);
967 printf("Loose cut on tracklet DCA to Z axis %f\n",fCoarseMaxRCut);
6a0d56b8 968 printf("Cut on DCA - tracklet to tracklet and to vertex %f\n",fDCAcut);
87104b06 969 printf("========= Second step selections ====================\n");
970 printf("Cut on tracklet-to-first-vertex Z distance %f\n",fMaxZCut);
cd1c2af1 971 printf("Max Phi difference: %f\n",fDiffPhiMax);
87104b06 972 printf("Cut on tracklet DCA to beam axis %f\n",fMaxRCut);
973 printf("Cut on tracklet DCA to beam axis (algo2) %f\n",fMaxRCut2);
974 printf("========= Pileup selections =========================\n");
cd1c2af1 975 printf("Pileup algo: %d\n",fPileupAlgo);
87104b06 976 printf("Min DCA to 1st vertex for pileup (algo 0 and 1): %f\n",fDCAforPileup);
977 printf("Cut on distance between pair-vertices (algo 2): %f\n",fCutOnPairs);
9801e044 978 printf("Maximum number of clusters allowed on L1 or L2: %d\n",fMaxNumOfCl);
6a0d56b8 979 printf("=======================================================\n");
70c95f95 980}