2 /**************************************************************************
3 * Copyright(c) 1998-2003, ALICE Experiment at CERN, All rights reserved. *
5 * Author: The ALICE Off-line Project. *
6 * Contributors are mentioned in the code where appropriate. *
8 * Permission to use, copy, modify and distribute this software and its *
9 * documentation strictly for non-commercial purposes is hereby granted *
10 * without fee, provided that the above copyright notice appears in all *
11 * copies and that both the copyright notice and this permission notice *
12 * appear in the supporting documentation. The authors make no claims *
13 * about the suitability of this software for any purpose. It is *
14 * provided "as is" without express or implied warranty. *
15 **************************************************************************/
17 ////////////////////////////////////////////////////
18 // Stand alone tracker class //
19 // Origin: Elisabetta Crescio //
20 // e-mail: crescio@to.infn.it //
21 // tracks are saved as AliITStrackV2 objects //
22 ////////////////////////////////////////////////////
28 #include <TObjArray.h>
31 #include "AliITSclusterTable.h"
32 #include "AliITSclusterV2.h"
33 #include "AliITSgeom.h"
34 #include "AliITSRiemannFit.h"
35 #include "AliITStrackerSA.h"
36 #include "AliITStrackSA.h"
37 #include "AliITSVertexer.h"
38 #include "AliESDVertex.h"
40 #include "AliESDtrack.h"
42 ClassImp(AliITStrackerSA)
44 //____________________________________________________________________________
45 AliITStrackerSA::AliITStrackerSA():AliITStrackerV2(){
46 // Default constructor
50 //____________________________________________________________________________
51 AliITStrackerSA::AliITStrackerSA(AliITSgeom *geom):AliITStrackerV2(geom)
53 // Standard constructor (Vertex is known and passed to this obj.)
60 //____________________________________________________________________________
61 AliITStrackerSA::AliITStrackerSA(AliITSgeom *geom, AliESDVertex *vert):AliITStrackerV2(geom)
63 // Standard constructor (Vertex is known and passed to this obj.)
70 //______________________________________________________________________
71 AliITStrackerSA::AliITStrackerSA(const AliITStrackerSA &trkr) :
72 AliITStrackerV2(trkr) {
74 // Copies are not allowed. The method is protected to avoid misuse.
75 Error("AliITStrackerSA","Copy constructor not allowed\n");
78 //______________________________________________________________________
79 AliITStrackerSA& AliITStrackerSA::operator=(const
80 AliITStrackerSA& /* trkr */){
81 // Assignment operator
82 // Assignment is not allowed. The method is protected to avoid misuse.
83 Error("= operator","Assignment operator not allowed\n");
87 //____________________________________________________________________________
88 AliITStrackerSA::AliITStrackerSA(AliITSgeom *geom, AliITSVertexer *vertexer):AliITStrackerV2(geom)
90 // Standard constructor (Vertex is unknown - vertexer is passed to this obj)
97 //____________________________________________________________________________
98 AliITStrackerSA::AliITStrackerSA(AliITStrackerSA& tracker):AliITStrackerV2(){
100 fPhiEstimate = tracker.fPhiEstimate;
101 for(Int_t i=0;i<2;i++){
102 fPoint1[i]=tracker.fPoint1[i];
103 fPoint2[i]=tracker.fPoint2[i];
104 fPoint3[i]=tracker.fPoint3[i];
105 fPointc[i]=tracker.fPointc[i];
107 fLambdac = tracker.fLambdac;
108 fPhic = tracker.fPhic;
109 fCoef1 = tracker.fCoef1;
110 fCoef2 = tracker.fCoef2;
111 fCoef3 = tracker.fCoef3;
112 fNloop = tracker.fNloop;
113 fPhiWin = tracker.fPhiWin;
114 fLambdaWin = tracker.fLambdaWin;
115 if(tracker.fVertexer && tracker.fVert){
116 fVert = new AliESDVertex(*tracker.fVert);
119 fVert = tracker.fVert;
121 fVertexer = tracker.fVertexer;
122 fGeom = tracker.fGeom;
123 fTable = tracker.fTable;
124 fListOfTracks = tracker.fListOfTracks;
127 //____________________________________________________________________________
128 AliITStrackerSA::~AliITStrackerSA(){
130 // if fVertexer is not null, the AliESDVertex obj. is owned by this class
131 // and is deleted here
133 if(fVert)delete fVert;
138 if(fPhiWin)delete []fPhiWin;
139 if(fLambdaWin)delete []fLambdaWin;
141 fListOfTracks->Delete();
144 //____________________________________________________________________________
145 void AliITStrackerSA::Init(){
146 // Reset all data members
148 for(Int_t i=0;i<3;i++){fPoint1[i]=0;fPoint2[i]=0;fPoint3[i]=0;}
163 fListOfTracks=new TObjArray(0,0);
165 //_______________________________________________________________________
166 void AliITStrackerSA::ResetForFinding(){
167 // Reset data members used in all loops during track finding
169 for(Int_t i=0;i<3;i++){fPoint1[i]=0;fPoint2[i]=0;fPoint3[i]=0;}
177 fListOfTracks->Delete();
179 //____________________________________________________________________________
180 void AliITStrackerSA::FindTracks(TTree *out,Int_t evnumber){
182 /**************************************************************************
183 * This function finds primary tracks.
186 * Example: to execute function with only the ITS (no combined tracking *
187 * with TPC+ITS) and requiring 5/6 points to define a good track *
188 * call SetSixPoinbts(kFALSE) in advance and then *
189 * use: FindTracks(treein,treeout,evnumber) *
190 * to execute combined tracking, before using FindTracks, use *
192 *************************************************************************/
195 Fatal("FindTracks","ITS cluster tree is not accessed - Abort!!!\n Please use method SetClusterTree to pass the pointer to the tree\n");
200 if(fVert)delete fVert;
201 fVert = fVertexer->FindVertexForCurrentEvent(evnumber);
204 gAlice->GetEvent(evnumber);
206 Fatal("FindTracks","Vertex is missing\n");
210 Double_t primaryVertex[3];
211 Double_t errorsprimvert[3];
212 fVert->GetXYZ(primaryVertex);
213 fVert->GetSigmaXYZ(errorsprimvert);
214 if(errorsprimvert[0]==0 || errorsprimvert[1]==0){
215 Warning("FindTracks","Set errors on vertex positions x and y at 0.0001");
216 errorsprimvert[0]=0.0001;
217 errorsprimvert[1]=0.0001;
219 fVert->PrintStatus();
222 //Fill array with cluster indices for each module
224 fTable = new AliITSclusterTable(fGeom,this,primaryVertex);
225 fTable->FillArray(fITSclusters);
226 fTable->FillArrayCoorAngles();
230 //Fill tree for found tracks
231 AliITStrackV2* outrack=0;
232 TBranch* branch=out->Branch("tracks","AliITStrackV2",&outrack,32000,0);
233 if (!branch) out->Branch("tracks","AliITStrackV2",&outrack,32000,3);
234 else branch->SetAddress(&outrack);
237 Int_t * firstmod = new Int_t[fGeom->GetNlayers()];
238 for(Int_t i=0;i<fGeom->GetNlayers();i++){
239 firstmod[i]=fGeom->GetModuleIndex(i+1,1,1);
241 // firstmod [i] number of the first module in the ITS layer i.
243 AliITSlayer &layer=fgLayers[0]; // first layer
245 Int_t dim=layer.GetNumberOfClusters();
246 //loop on the different windows
247 for(Int_t nloop=0;nloop<fNloop;nloop++){
248 for(Int_t ncl=0;ncl<dim;ncl++){
249 //loop starting from layer 0
252 AliITSclusterV2* cl = layer.GetCluster(ncl);
253 if(cl->IsUsed()==1) continue;
254 if(cl->TestBit(kSAflag)==kTRUE) continue;
256 fPhic = fTable->GetPhiCluster(0,ncl);
257 fLambdac = fTable->GetLambdaCluster(0,ncl);
258 fPhiEstimate = fPhic;
259 AliITStrackSA* trs = new AliITStrackSA();
260 fPoint1[0]=primaryVertex[0];
261 fPoint1[1]=primaryVertex[1];
262 fPoint2[0]=fTable->GetXCluster(0,ncl);
263 fPoint2[1]=fTable->GetYCluster(0,ncl);
265 Int_t * nn = new Int_t[fGeom->GetNlayers()];//counter for clusters on each layer
266 for(Int_t i=0;i<fGeom->GetNlayers();i++){ nn[i]=0;}
267 nn[0] = SearchClusters(0,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],pflag,fTable);
268 nn[1] = SearchClusters(1,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],pflag,fTable);
272 fPoint3[0] = fPointc[0];
273 fPoint3[1] = fPointc[1];
275 nn[2] = SearchClusters(2,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],pflag,fTable);
276 if(nn[1]==0 && nn[2]==0) pflag=0;
277 if(nn[2]!=0 && nn[1]!=0){ pflag=1; UpdatePoints();}
278 if(nn[2]!=0 && nn[1]==0){
280 fPoint3[0]=fPointc[0];
281 fPoint3[1]=fPointc[1];
284 nn[3] = SearchClusters(3,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],pflag,fTable);
286 if(nn[3]!=0) UpdatePoints();
287 nn[4] = SearchClusters(4,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],pflag,fTable);
289 if(nn[4]!=0) UpdatePoints();
290 nn[5] = SearchClusters(5,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],pflag,fTable);
294 Int_t numberofpoints;
295 if(fSixPoints) numberofpoints=6; //check of the candidate track
296 else numberofpoints=5; //if track is good (with the required number
297 for(Int_t nnp=0;nnp<fGeom->GetNlayers();nnp++){ //of points) it is written on file
298 if(nn[nnp]!=0) layOK+=1;
300 if(layOK>=numberofpoints){
301 AliITStrackV2* tr2 = FitTrack(trs,primaryVertex,errorsprimvert);
303 Int_t nct = trs->GetNumberOfClustersSA();
305 Int_t index = trs->GetClusterIndexSA(nct);
306 AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
307 if(kl->TestBit(kSAflag)==kTRUE) kl->ResetBit(kSAflag);
314 Int_t nct = tr2->GetNumberOfClusters();
317 Int_t index = tr2->GetClusterIndex(nct);
318 AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
324 Int_t nct = trs->GetNumberOfClustersSA();
326 Int_t index = trs->GetClusterIndexSA(nct);
327 AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
328 if(kl->TestBit(kSAflag)==kTRUE) kl->ResetBit(kSAflag);
333 }//end loop on clusters of layer1
337 //if 5/6 points are required, second loop starting
338 //from second layer, to find tracks with point of
342 // counter for clusters on each layer
343 Int_t * nn = new Int_t[fGeom->GetNlayers()-1];
344 for(Int_t nloop=0;nloop<fNloop;nloop++){
345 AliITSlayer &layer2=fgLayers[1]; //loop on layer 2
346 Int_t ncl2=layer2.GetNumberOfClusters();
347 while(ncl2--){ //loop starting from layer 2
350 AliITSclusterV2* cl = layer2.GetCluster(ncl2);
351 if(cl->IsUsed()==1) continue;
352 if(cl->TestBit(kSAflag)==kTRUE) continue;
353 fPhic = fTable->GetPhiCluster(1,ncl2);
354 fLambdac = fTable->GetLambdaCluster(1,ncl2);
355 fPhiEstimate = fPhic;
356 AliITStrackSA* trs = new AliITStrackSA();
358 fPoint1[0]=primaryVertex[0];
359 fPoint1[1]=primaryVertex[1];
360 fPoint2[0]=fTable->GetXCluster(1,ncl2);;
361 fPoint2[1]=fTable->GetYCluster(1,ncl2);;
363 for(Int_t kk=0;kk<fGeom->GetNlayers()-1;kk++)nn[kk] = 0;
364 for(Int_t kk=0;kk<fGeom->GetNlayers()-1;kk++){
365 nn[kk] = SearchClusters(kk+1,fPhiWin[nloop],fLambdaWin[nloop],
366 trs,primaryVertex[2],pflag,fTable);
374 for(Int_t nnp=0;nnp<fGeom->GetNlayers()-1;nnp++){
375 if(nn[nnp]!=0) fl+=1;
378 AliITStrackV2* tr2 = FitTrack(trs,primaryVertex,errorsprimvert);
380 Int_t nct = trs->GetNumberOfClustersSA();
382 Int_t index = trs->GetClusterIndexSA(nct);
383 AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
384 if(kl->TestBit(kSAflag)==kTRUE) kl->ResetBit(kSAflag);
390 Int_t nct = tr2->GetNumberOfClusters();
392 Int_t index = tr2->GetClusterIndex(nct);
393 AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
399 Int_t nct = trs->GetNumberOfClustersSA();
401 Int_t index = trs->GetClusterIndexSA(nct);
402 AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
404 if(kl->TestBit(kSAflag)==kTRUE) kl->ResetBit(kSAflag);
408 }//end loop on clusters of layer2
411 } // if(!fSixPoints....
414 delete fTable; fTable=0;
418 //______________________________________________________________________
419 Int_t AliITStrackerSA::FindTracks(AliESD* event){
421 // Track finder using the ESD object
425 Fatal("FindTracks","ITS cluster tree is not accessed - Abort!!!\n Please use method SetClusterTree to pass the pointer to the tree\n");
430 Double_t errorsprimvert[3];
431 Double_t primaryVertex[3];
432 event->GetVertex()->GetXYZ(primaryVertex);
433 event->GetVertex()->GetSigmaXYZ(errorsprimvert);
435 if(errorsprimvert[0]==0 || errorsprimvert[1]==0){
436 // Warning("FindTracks","Set errors on vertex positions x and y at 0.005");
437 errorsprimvert[0]=0.005;
438 errorsprimvert[1]=0.005;
441 //Fill array with cluster indices for each module
443 fTable = new AliITSclusterTable(fGeom,this,primaryVertex);
444 fTable->FillArray(fITSclusters);
445 fTable->FillArrayCoorAngles();
448 Int_t * firstmod = new Int_t[fGeom->GetNlayers()];
449 for(Int_t i=0;i<fGeom->GetNlayers();i++){
450 firstmod[i]=fGeom->GetModuleIndex(i+1,1,1);
452 // firstmod [i] number of the first module in the ITS layer i.
455 AliITSlayer &layer=fgLayers[0];
457 Int_t dim=layer.GetNumberOfClusters();
458 //loop on the different windows
459 for(Int_t nloop=0;nloop<fNloop;nloop++){
460 for(Int_t ncl=0;ncl<dim;ncl++){ //loop starting from layer 0
464 AliITSclusterV2* cl = (AliITSclusterV2*)layer.GetCluster(ncl);
466 if(cl->IsUsed()==1) continue;
467 if(cl->TestBit(kSAflag)==kTRUE) continue;
469 fPhic = fTable->GetPhiCluster(0,ncl);
470 fLambdac = fTable->GetLambdaCluster(0,ncl);
471 fPhiEstimate = fPhic;
472 AliITStrackSA* trs = new AliITStrackSA();
473 fPoint1[0]=primaryVertex[0];
474 fPoint1[1]=primaryVertex[1];
475 fPoint2[0]=fTable->GetXCluster(0,ncl);
476 fPoint2[1]=fTable->GetYCluster(0,ncl);
477 Int_t * nn = new Int_t[fGeom->GetNlayers()];//counter for clusters on each layer
478 for(Int_t i=0;i<fGeom->GetNlayers();i++){ nn[i]=0;}
479 nn[0] = SearchClusters(0,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],pflag,fTable);
481 nn[1] = SearchClusters(1,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],pflag,fTable);
484 fPoint3[0] = fPointc[0];
485 fPoint3[1] = fPointc[1];
487 nn[2] = SearchClusters(2,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],pflag,fTable);
488 if(nn[1]==0 && nn[2]==0) pflag=0;
489 if(nn[2]!=0 && nn[1]!=0){ pflag=1; UpdatePoints();}
490 if(nn[2]!=0 && nn[1]==0){
492 fPoint3[0]=fPointc[0];
493 fPoint3[1]=fPointc[1];
496 nn[3] = SearchClusters(3,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],pflag,fTable);
498 if(nn[3]!=0) UpdatePoints();
499 nn[4] = SearchClusters(4,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],pflag,fTable);
501 if(nn[4]!=0) UpdatePoints();
502 nn[5] = SearchClusters(5,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],pflag,fTable);
506 Int_t numberofpoints;
507 if(fSixPoints) numberofpoints=6; //check of the candidate track
508 else numberofpoints=5; //if track is good (with the required number
509 for(Int_t nnp=0;nnp<fGeom->GetNlayers();nnp++){ //of points) it is written on file
510 if(nn[nnp]!=0) layOK+=1;
512 if(layOK>=numberofpoints){
513 AliITStrackV2* tr2 = FitTrack(trs,primaryVertex,errorsprimvert);
515 Int_t nct = trs->GetNumberOfClustersSA();
517 Int_t index = trs->GetClusterIndexSA(nct);
518 AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
519 if(kl->TestBit(kSAflag)==kTRUE) kl->ResetBit(kSAflag);
525 AliESDtrack outtrack;
526 outtrack.UpdateTrackParams(tr2,AliESDtrack::kITSin);
527 event->AddTrack(&outtrack);
529 Int_t nct = tr2->GetNumberOfClusters();
531 Int_t index = tr2->GetClusterIndex(nct);
532 AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
538 Int_t nct = trs->GetNumberOfClustersSA();
540 Int_t index = trs->GetClusterIndexSA(nct);
541 AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
542 if(kl->TestBit(kSAflag)==kTRUE) kl->ResetBit(kSAflag);
549 }//end loop on clusters of layer1
555 //if 5/6 points are required, second loop starting
556 //from second layer, to find tracks with point of
560 // counter for clusters on each layer
561 Int_t * nn = new Int_t[fGeom->GetNlayers()-1];
562 for(Int_t nloop=0;nloop<fNloop;nloop++){
563 AliITSlayer &layer2=fgLayers[1];
564 Int_t ncl2=layer2.GetNumberOfClusters();
565 while(ncl2--){ //loop starting from layer 2
568 AliITSclusterV2* cl = layer2.GetCluster(ncl2);
569 if(cl->IsUsed()==1) continue;
570 if(cl->TestBit(kSAflag)==kTRUE) continue;
571 fPhic = fTable->GetPhiCluster(1,ncl2);
572 fLambdac = fTable->GetLambdaCluster(1,ncl2);
573 fPhiEstimate = fPhic;
574 AliITStrackSA* trs = new AliITStrackSA();
575 fPoint1[0]=primaryVertex[0];
576 fPoint1[1]=primaryVertex[1];
577 fPoint2[0]=fTable->GetXCluster(1,ncl2);
578 fPoint2[1]=fTable->GetYCluster(1,ncl2);
580 for(Int_t kk=0;kk<fGeom->GetNlayers()-1;kk++)nn[kk] = 0;
581 for(Int_t kk=0;kk<fGeom->GetNlayers()-1;kk++){
582 nn[kk] = SearchClusters(kk+1,fPhiWin[nloop],fLambdaWin[nloop],
583 trs,primaryVertex[2],pflag,fTable);
591 for(Int_t nnp=0;nnp<fGeom->GetNlayers()-1;nnp++){
592 if(nn[nnp]!=0) fl+=1;
595 AliITStrackV2* tr2 = FitTrack(trs,primaryVertex,errorsprimvert);
597 Int_t nct = trs->GetNumberOfClustersSA();
599 Int_t index = trs->GetClusterIndexSA(nct);
600 AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
601 if(kl->TestBit(kSAflag)==kTRUE) kl->ResetBit(kSAflag);
608 AliESDtrack outtrack;
609 outtrack.UpdateTrackParams(tr2,AliESDtrack::kITSin);
610 event->AddTrack(&outtrack);
612 Int_t nct = tr2->GetNumberOfClusters();
614 Int_t index = tr2->GetClusterIndex(nct);
615 AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
621 Int_t nct = trs->GetNumberOfClustersSA();
623 Int_t index = trs->GetClusterIndexSA(nct);
624 AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
626 if(kl->TestBit(kSAflag)==kTRUE) kl->ResetBit(kSAflag);
631 }//end loop on clusters of layer2
637 delete fTable;fTable=0;
638 Info("FindTracks","Number of found tracks: %d",event->GetNumberOfTracks());
644 //________________________________________________________________________
646 AliITStrackV2* AliITStrackerSA::FitTrack(AliITStrackSA* tr,Double_t *primaryVertex,Double_t *errorsprimvert){
647 //fit of the found track
650 Int_t * firstmod = new Int_t[fGeom->GetNlayers()];
651 for(Int_t i=0;i<fGeom->GetNlayers();i++){
652 firstmod[i]=fGeom->GetModuleIndex(i+1,1,1);
654 AliITStrackV2* otrack2;
655 Int_t nclusters = tr->GetNumberOfClustersSA();
656 TObjArray** listlayer = new TObjArray*[fGeom->GetNlayers()];
657 for(Int_t i=0;i<fGeom->GetNlayers();i++){
658 listlayer[i] = new TObjArray(0,0);
668 Int_t * nnn = new Int_t[fGeom->GetNlayers()];
669 for(Int_t i=0;i<fGeom->GetNlayers();i++)nnn[i]=0;
671 for(Int_t ncl=0;ncl<nclusters;ncl++){
672 Int_t index = tr->GetClusterIndexSA(ncl);
673 AliITSclusterV2* cl = (AliITSclusterV2*)GetCluster(index);
675 if(cl->TestBit(kSAflag)==kTRUE) cl->ResetBit(kSAflag);
676 Int_t lay = (index & 0xf0000000) >> 28;
677 if(lay==0) { listlayer[0]->AddLast(cl); clind0[nnn[0]]=index;nnn[0]++;}
678 if(lay==1) { listlayer[1]->AddLast(cl); clind1[nnn[1]]=index;nnn[1]++;}
679 if(lay==2) { listlayer[2]->AddLast(cl); clind2[nnn[2]]=index;nnn[2]++;}
680 if(lay==3) { listlayer[3]->AddLast(cl); clind3[nnn[3]]=index;nnn[3]++;}
681 if(lay==4) { listlayer[4]->AddLast(cl); clind4[nnn[4]]=index;nnn[4]++;}
682 if(lay==5) { listlayer[5]->AddLast(cl); clind5[nnn[5]]=index;nnn[5]++;}
687 Int_t * end = new Int_t[fGeom->GetNlayers()];
688 for(Int_t i=0;i<fGeom->GetNlayers();i++){
689 if(listlayer[i]->GetEntries()==0) end[i]=1;
690 else end[i]=listlayer[i]->GetEntries();
693 for(Int_t l1=0;l1<end[0];l1++){//loop on layer 1
694 AliITSclusterV2* cl0 = (AliITSclusterV2*)listlayer[0]->At(l1);
695 TVector3** recp = new TVector3*[3];
696 TVector3** errs = new TVector3*[3];
697 recp[0] = new TVector3(primaryVertex[0],primaryVertex[1],primaryVertex[2]);
698 errs[0] = new TVector3(errorsprimvert[0],errorsprimvert[1],errorsprimvert[2]);
699 Double_t x1,y1,z1,sx1,sy1,sz1;
700 Double_t x2,y2,z2,sx2,sy2,sz2;
701 AliITSclusterV2* p1=0;
702 AliITSclusterV2* p2=0;
703 Int_t index1=clind0[l1];
705 for(Int_t l2=0;l2<end[1];l2++){//loop on layer 2
706 AliITSclusterV2* cl1 = (AliITSclusterV2*)listlayer[1]->At(l2);
708 for(Int_t l3=0;l3<end[2];l3++){ //loop on layer 3
709 AliITSclusterV2* cl2 = (AliITSclusterV2*)listlayer[2]->At(l3);
711 if(cl0==0 && cl1!=0) {
712 p2 = cl2;index1=clind2[l3];
716 if(cl0!=0 && cl1==0){
718 p2=cl2;index2=clind2[l3];
720 if(cl0!=0 && cl1!=0){
724 Int_t lay1=(index1 & 0xf0000000) >> 28;
725 Int_t cln1=(index1 & 0x0fffffff) >> 00;
726 Int_t lay2=(index2 & 0xf0000000) >> 28;
727 Int_t cln2=(index2 & 0x0fffffff) >> 00;
728 x1 = fTable->GetXCluster(lay1,cln1);
729 x2 = fTable->GetXCluster(lay2,cln2);
730 y1 = fTable->GetYCluster(lay1,cln1);
731 y2 = fTable->GetYCluster(lay2,cln2);
732 z1 = fTable->GetZCluster(lay1,cln1);
733 z2 = fTable->GetZCluster(lay2,cln2);
734 sx1 = fTable->GetXClusterError(lay1,cln1);
735 sx2 = fTable->GetXClusterError(lay2,cln2);
736 sy1 = fTable->GetYClusterError(lay1,cln1);
737 sy2 = fTable->GetYClusterError(lay2,cln2);
738 sz1 = fTable->GetZClusterError(lay1,cln1);
739 sz2 = fTable->GetZClusterError(lay2,cln2);
740 Double_t phi1 = fTable->GetPhiCluster(lay1,cln1);
741 Int_t module1 = p1->GetDetectorIndex()+firstmod[0];
742 recp[1] = new TVector3(x1,y1,z1);
743 errs[1] = new TVector3(sx1,sy1,sz1);
744 recp[2] = new TVector3(x2,y2,z2);
745 errs[2] = new TVector3(sx2,sy2,sz2);
747 //fit on the Riemann sphere
748 Float_t seed1,seed2,seed3;
749 AliITSRiemannFit fit;
750 Int_t rf = fit.FitHelix(3,recp,errs,seed1,seed2,seed3); //this gives phi,tgl,curvature to start Kalman Filter
756 if(seed1>-TMath::Pi() && seed1<-0.5*TMath::Pi()){
757 phi=seed1+1.5*TMath::Pi();
760 if(seed1>-0.5*TMath::Pi() && seed1<0.5*TMath::Pi()){
761 phi=seed1+0.5*TMath::Pi();
764 if(seed1>0.5*TMath::Pi() && seed1<TMath::Pi()){
765 phi=seed1-0.5*TMath::Pi();
770 if(seed1>-TMath::Pi() && seed1<-0.5*TMath::Pi()){
771 phi=seed1+0.5*TMath::Pi();
774 if(seed1>-0.5*TMath::Pi() && seed1<0.5*TMath::Pi()){
775 phi=seed1-0.5*TMath::Pi();
778 if(seed1>0.5*TMath::Pi() && seed1<TMath::Pi()){
779 phi=seed1-1.5*TMath::Pi();
784 Int_t layer,ladder,detector;
785 fGeom->GetModuleId(module1,layer,ladder,detector);
786 Float_t yclu1 = p1->GetY();
787 Float_t zclu1 = p1->GetZ();
788 Double_t cv=Curvature(primaryVertex[0],primaryVertex[1],x1,y1,x2,y2);
790 for(Int_t l4=0;l4<end[3];l4++){ //loop on layer 4
791 AliITSclusterV2* cl3 = (AliITSclusterV2*)listlayer[3]->At(l4);
792 for(Int_t l5=0;l5<end[4];l5++){ //loop on layer 5
793 AliITSclusterV2* cl4 = (AliITSclusterV2*)listlayer[4]->At(l5);
794 for(Int_t l6=0;l6<end[5];l6++){ //loop on layer 6
795 AliITSclusterV2* cl5 = (AliITSclusterV2*)listlayer[5]->At(l6);
796 AliITStrackSA* trac = new AliITStrackSA(layer,ladder,detector,yclu1,zclu1,phi,tgl,cv,1);
798 if(cl5!=0) trac->AddClusterV2(5,(clind5[l6] & 0x0fffffff)>>0);
799 if(cl4!=0) trac->AddClusterV2(4,(clind4[l5] & 0x0fffffff)>>0);
800 if(cl3!=0) trac->AddClusterV2(3,(clind3[l4] & 0x0fffffff)>>0);
801 if(cl2!=0) trac->AddClusterV2(2,(clind2[l3] & 0x0fffffff)>>0);
802 if(cl1!=0) trac->AddClusterV2(1,(clind1[l2] & 0x0fffffff)>>0);
803 if(cl0!=0) trac->AddClusterV2(0,(clind0[l1] & 0x0fffffff)>>0);
805 //fit with Kalman filter using AliITStrackerV2::RefitAt()
807 AliITStrackV2* ot = new AliITStrackV2(*trac);
809 ot->ResetCovariance();
812 if(RefitAt(49.,ot,trac)){ //fit from layer 1 to layer 6
814 otrack2 = new AliITStrackV2(*ot);
815 otrack2->ResetCovariance();
816 otrack2->ResetClusters();
817 //fit from layer 6 to layer 1
818 if(RefitAt(3.7,otrack2,ot)) fListOfTracks->AddLast(otrack2);
828 for(Int_t i=1;i<3;i++){
842 Int_t dim=fListOfTracks->GetEntries();
844 for(Int_t i=0;i<fGeom->GetNlayers();i++){
851 AliITStrackV2* otrack =(AliITStrackV2*)FindTrackLowChiSquare(fListOfTracks,dim);
853 if(otrack==0) return 0;
854 Int_t * indexc = new Int_t[fGeom->GetNlayers()];
855 for(Int_t i=0;i<fGeom->GetNlayers();i++) indexc[i]=0;
856 for(Int_t nind=0;nind<otrack->GetNumberOfClusters();nind++){
857 indexc[nind] = otrack->GetClusterIndex(nind);
859 AliITSclusterV2* cl0 = (AliITSclusterV2*)GetCluster(indexc[0]);
860 AliITSclusterV2* cl1 = (AliITSclusterV2*)GetCluster(indexc[1]);
861 AliITSclusterV2* cl2 = (AliITSclusterV2*)GetCluster(indexc[2]);
862 AliITSclusterV2* cl3 = (AliITSclusterV2*)GetCluster(indexc[3]);
863 AliITSclusterV2* cl4 = (AliITSclusterV2*)GetCluster(indexc[4]);
864 Int_t labl[3]={-1,-1,-1};
865 if(otrack->GetNumberOfClusters()==fGeom->GetNlayers()){
866 AliITSclusterV2* cl5 = (AliITSclusterV2*)GetCluster(indexc[5]);
867 labl[0]=cl5->GetLabel(0);
868 labl[1]=cl5->GetLabel(1);
869 labl[2]=cl5->GetLabel(2);
872 if(otrack->GetNumberOfClusters()==(fGeom->GetNlayers()-1)){
877 Int_t numberofpoints;
878 if(fSixPoints) numberofpoints=6;
879 else numberofpoints=5;
880 Int_t label = Label(cl0->GetLabel(0),cl1->GetLabel(0),
881 cl2->GetLabel(0),cl3->GetLabel(0),
882 cl4->GetLabel(0),labl[0],
883 cl0->GetLabel(1),cl1->GetLabel(1),
884 cl2->GetLabel(1),cl3->GetLabel(1),
885 cl4->GetLabel(1),labl[1],
886 cl0->GetLabel(2),cl1->GetLabel(2),
887 cl2->GetLabel(2),cl3->GetLabel(2),
888 cl4->GetLabel(2),labl[2],numberofpoints);
890 otrack->SetLabel(label);
891 for(Int_t i=0;i<fGeom->GetNlayers();i++){
900 //_______________________________________________________________________
901 void AliITStrackerSA::UseFoundTracksV2(Int_t evnum,TTree* treev2){
902 // Marks as used clusters belonging to tracks found with V2 TPC+ITS tracking
903 //(or AliITStrackV2 tracks found with function FindTracks of this class)
908 if(fVert)delete fVert;
909 fVert = fVertexer->FindVertexForCurrentEvent(evnum);
912 gAlice->GetEvent(evnum);
914 Fatal("FindTracks","Vertex is missing\n");
918 Double_t primaryVertex[3];
919 fVert->GetXYZ(primaryVertex);
922 fTable = new AliITSclusterTable(fGeom,this,primaryVertex);
923 fTable->FillArray(fITSclusters);
924 fTable->FillArrayCoorAngles();
927 TBranch* bra = (TBranch*)treev2->GetBranch("tracks");
928 if(!bra) Warning("UseFoundTracksV2","No branch for track tree");
929 AliITStrackV2* ttrrt = new AliITStrackV2;
930 bra->SetAddress(&ttrrt);
932 for(Int_t nj=0;nj<treev2->GetEntries();nj++){
933 treev2->GetEvent(nj);
934 Int_t ncl = ttrrt->GetNumberOfClusters();
935 for(Int_t k=0;k<ncl;k++){
936 Int_t index = ttrrt->GetClusterIndex(k);
937 AliITSclusterV2* clui = (AliITSclusterV2*)GetCluster(index);
938 if(clui->IsUsed()==0) clui->Use();
946 //_______________________________________________________________________
947 void AliITStrackerSA::UseFoundTracksV2(AliESD *event){
948 // Marks as used clusters belonging to tracks found with V2 TPC+ITS tracking
952 Double_t primaryVertex[3];
953 event->GetVertex()->GetXYZ(primaryVertex);
956 fTable = new AliITSclusterTable(fGeom,this,primaryVertex);
957 fTable->FillArray(fITSclusters);
958 fTable->FillArrayCoorAngles();
961 Int_t ntracks = event->GetNumberOfTracks();
963 AliESDtrack *esd=event->GetTrack(ntracks);
964 if ((esd->GetStatus()&
965 AliESDtrack::kITSin|AliESDtrack::kTPCin)==0) continue;
967 Int_t ncl = esd->GetITSclusters(idx);
968 for(Int_t clu=0; clu<ncl; clu++){
969 AliITSclusterV2* cl = (AliITSclusterV2*)GetCluster(idx[clu]);
970 if(cl->IsUsed()==0) cl->Use();
974 Info("UseFoundTracksV2","Clusters of tracks prolonged from TPC deleted");
979 //_______________________________________________________
980 Int_t AliITStrackerSA::SearchClusters(Int_t layer,Double_t phiwindow,Double_t lambdawindow, AliITStrackSA* trs,Double_t zvertex,Int_t pflag,AliITSclusterTable* table){
981 //function used to to find the clusters associated to the track
983 AliITSlayer &lay = fgLayers[layer];
984 Int_t * firstmod = new Int_t[fGeom->GetNlayers()];
985 for(Int_t i=0;i<fGeom->GetNlayers();i++){
986 firstmod[i]=fGeom->GetModuleIndex(i+1,1,1);
990 Float_t cx1,cx2,cy1,cy2;
991 FindEquation(fPoint1[0],fPoint1[1],fPoint2[0],fPoint2[1],fPoint3[0],fPoint3[1],fCoef1,fCoef2,fCoef3);
992 Int_t fun = FindIntersection(fCoef1,fCoef2,fCoef3,-(lay.GetR()*lay.GetR()),cx1,cy1,cx2,cy2);
998 Double_t fi1 =TMath::ATan2(cy1,cx1);
999 Double_t fi2 =TMath::ATan2(cy2,cx2);
1000 fPhiEstimate = ChoosePoint(fi1,fi2,fPhic);
1003 Double_t zed = TMath::Tan(fLambdac)*lay.GetR()+zvertex;
1004 Double_t zed1 = TMath::Tan(fLambdac+lambdawindow)*lay.GetR()+zvertex;
1005 Double_t zed2 = TMath::Tan(fLambdac-lambdawindow)*lay.GetR()+zvertex;
1007 Double_t fi = fPhiEstimate;
1008 Int_t nmod = lay.FindDetectorIndex(fi,zed);
1013 nmod += firstmod[layer];
1015 Int_t nm[8]={0,0,0,0,0,0,0,0};
1016 nm[0] = lay.FindDetectorIndex(fi+phiwindow,zed);
1017 nm[1] = lay.FindDetectorIndex(fi-phiwindow,zed);
1018 nm[2] = lay.FindDetectorIndex(fi,zed1);
1019 nm[3] = lay.FindDetectorIndex(fi,zed2);
1020 nm[4] = lay.FindDetectorIndex(fi+phiwindow,zed1);
1021 nm[5] = lay.FindDetectorIndex(fi-phiwindow,zed1);
1022 nm[6] = lay.FindDetectorIndex(fi+phiwindow,zed2);
1023 nm[7] = lay.FindDetectorIndex(fi-phiwindow,zed2);
1027 TArrayI* array =(TArrayI*)table->GetListOfClusters(nmod);
1028 TArrayI* listc = new TArrayI(array->GetSize());
1029 for(Int_t i=0;i<array->GetSize();i++){
1030 Int_t in=(Int_t)array->At(i);
1031 listc->AddAt(in,nn);
1038 for(Int_t h=k+1;h<8;h++){
1051 for(Int_t ii=0;ii<8;ii++){
1052 if(nm[ii]!=value && nm[ii]!=nmod && nm[ii]>=0){
1053 TArrayI* ar =(TArrayI*)table->GetListOfClusters(nm[ii]+firstmod[layer]);
1054 listc->Set(listc->GetSize()+ar->GetSize());
1055 for(Int_t j=0;j<ar->GetSize();j++){
1056 Int_t in=(Int_t)ar->At(j);
1057 listc->AddAt(in,nn);
1065 for(Int_t i=0;i<listc->GetSize();i++){
1066 Int_t index = (Int_t)listc->At(i);
1067 AliITSclusterV2* cllay = lay.GetCluster(index);
1068 if(cllay==0) continue;
1069 if(cllay->IsUsed()==1) continue;
1070 if(cllay->TestBit(kSAflag)==kTRUE) continue;
1071 Double_t phi = fTable->GetPhiCluster(layer,index);
1072 Double_t lambda= fTable->GetLambdaCluster(layer,index);
1074 if(TMath::Abs(fLambdac-lambda)<lambdawindow &&
1075 TMath::Abs(fPhiEstimate-phi)<phiwindow){
1078 if(trs->GetNumberOfClustersSA()==15){
1083 trs->AddClusterSA(layer,index);
1084 cllay->SetBit(kSAflag);
1086 fPointc[0]=fTable->GetXCluster(layer,index);
1087 fPointc[1]=fTable->GetYCluster(layer,index);
1099 //________________________________________________________________
1100 void AliITStrackerSA::UpdatePoints(){
1101 //update of points for the estimation of the curvature
1103 //fPoint1[0]=fPoint2[0];
1104 //fPoint1[1]=fPoint2[1];
1105 fPoint2[0]=fPoint3[0];
1106 fPoint2[1]=fPoint3[1];
1107 fPoint3[0]=fPointc[0];
1108 fPoint3[1]=fPointc[1];
1113 //___________________________________________________________________
1114 Int_t AliITStrackerSA::FindEquation(Float_t x1, Float_t y1, Float_t x2, Float_t y2, Float_t x3, Float_t y3,Float_t& a, Float_t& b, Float_t& c){
1116 //given (x,y) of three recpoints (in global coordinates)
1117 //returns the parameters a,b,c of circonference x*x + y*y +a*x + b*y +c
1119 Float_t den = (x3-x1)*(y2-y1)-(x2-x1)*(y3-y1);
1120 if(den==0) return 0;
1121 a = ((y3-y1)*(x2*x2+y2*y2-x1*x1-y1*y1)-(y2-y1)*(x3*x3+y3*y3-x1*x1-y1*y1))/den;
1122 b = -(x2*x2-x1*x1+y2*y2-y1*y1+a*(x2-x1))/(y2-y1);
1123 c = -x1*x1-y1*y1-a*x1-b*y1;
1126 //__________________________________________________________________________
1127 Int_t AliITStrackerSA::FindIntersection(Float_t a1, Float_t b1, Float_t c1, Float_t c2,Float_t& x1,Float_t& y1, Float_t& x2, Float_t& y2){
1129 //Finds the intersection between the circonference of the track and the circonference centered in (0,0) represented by one layer
1130 //c2 is -rlayer*rlayer
1134 Float_t aA = (b1*b1)/(a1*a1)+1;
1135 Float_t bB = (-2*m*b1/(a1*a1));
1136 Float_t cC = c2+(m*m)/(a1*a1);
1137 if((bB*bB-4*aA*cC)<0) return 0;
1139 y1 = (-bB+TMath::Sqrt(bB*bB-4*aA*cC))/(2*aA);
1140 y2 = (-bB-TMath::Sqrt(bB*bB-4*aA*cC))/(2*aA);
1141 x1 = (c2-c1-b1*y1)/a1;
1142 x2 = (c2-c1-b1*y2)/a1;
1146 //____________________________________________________________________
1147 Double_t AliITStrackerSA::Curvature(Double_t x1,Double_t y1,Double_t
1148 x2,Double_t y2,Double_t x3,Double_t y3){
1150 //calculates the curvature of track
1151 Double_t den = (x3-x1)*(y2-y1)-(x2-x1)*(y3-y1);
1152 if(den==0) return 0;
1153 Double_t a = ((y3-y1)*(x2*x2+y2*y2-x1*x1-y1*y1)-(y2-y1)*(x3*x3+y3*y3-x1*x1-y1*y1))/den;
1154 Double_t b = -(x2*x2-x1*x1+y2*y2-y1*y1+a*(x2-x1))/(y2-y1);
1155 Double_t c = -x1*x1-y1*y1-a*x1-b*y1;
1158 if((a*a+b*b-4*c)<0) return 0;
1159 Double_t rad = TMath::Sqrt(a*a+b*b-4*c)/2.;
1160 if(rad==0) return 0;
1162 if((x1>0 && y1>0 && x1<xc)) rad*=-1;
1163 if((x1<0 && y1>0 && x1<xc)) rad*=-1;
1164 // if((x1<0 && y1<0 && x1<xc)) rad*=-1;
1165 // if((x1>0 && y1<0 && x1<xc)) rad*=-1;
1170 //____________________________________________________________________
1171 Double_t AliITStrackerSA::ChoosePoint(Double_t p1, Double_t p2, Double_t pp){
1173 //Returns the point closest to pp
1175 Double_t diff1 = p1-pp;
1176 Double_t diff2 = p2-pp;
1178 if(TMath::Abs(diff1)<TMath::Abs(diff2)) fPhiEstimate=p1;
1179 else fPhiEstimate=p2;
1180 return fPhiEstimate;
1185 //_________________________________________________________________
1186 AliITStrackV2* AliITStrackerSA::FindTrackLowChiSquare(TObjArray* tracklist, Int_t dim) const {
1187 // returns track with lowes chi square
1189 AliITStrackV2* trk = (AliITStrackV2*)tracklist->At(0);
1192 if(dim==0) return 0;
1193 Double_t * chi2 = new Double_t[dim];
1194 Int_t * index = new Int_t[dim];
1195 for(Int_t i=0;i<dim;i++){
1196 AliITStrackV2* trk = (AliITStrackV2*)tracklist->At(i);
1197 chi2[i]=trk->GetChi2();
1201 Int_t w=0;Double_t value;
1204 for(Int_t j=w+1;j<dim;j++){
1205 if(chi2[w]<chi2[j]){
1217 AliITStrackV2* trk = (AliITStrackV2*)tracklist->At(index[dim-1]);
1224 //__________________________________________________________
1225 Int_t AliITStrackerSA::FindLabel(Int_t l1, Int_t l2, Int_t l3, Int_t l4, Int_t l5, Int_t l6){
1227 //function used to determine the track label
1229 Int_t lb[6] = {l1,l2,l3,l4,l5,l6};
1230 Int_t aa[6]={1,1,1,1,1,1};
1233 Int_t k=0;Int_t w=0;Int_t num=6;
1234 if(lb[5]==-1) num=5;
1238 for(Int_t i=k+1;i<num;i++){
1240 if(lb[k]==lb[i] && aa[k]!=0){
1251 for(Int_t j=0;j<6;j++){
1263 if(num==6) return lb[5];
1267 //_____________________________________________________________________________
1268 Int_t AliITStrackerSA::Label(Int_t gl1, Int_t gl2, Int_t gl3, Int_t gl4, Int_t gl5, Int_t gl6,Int_t gl7, Int_t gl8, Int_t gl9, Int_t gl10,Int_t gl11,
1269 Int_t gl12, Int_t gl13, Int_t gl14,Int_t gl15, Int_t gl16, Int_t gl17, Int_t gl18, Int_t numberofpoints){
1272 //function used to assign label to the found track. If track is fake, the label is negative
1274 Int_t lb0[6] = {gl1,gl2,gl3,gl4,gl5,gl6};
1275 Int_t lb1[6] = {gl7,gl8,gl9,gl10,gl11,gl12};
1276 Int_t lb2[6] = {gl13,gl14,gl15,gl16,gl17,gl18};
1277 Int_t ll=FindLabel(lb0[0],lb0[1],lb0[2],lb0[3],lb0[4],lb0[5]);
1278 Int_t lflag=0;Int_t num=6;
1279 if(lb0[5]==-1 && lb1[5]==-1 && lb2[5]==-1) num=5;
1281 for(Int_t i=0;i<num;i++){
1282 if(lb0[i]==ll || lb1[i]==ll || lb2[i]==ll) lflag+=1;
1285 if(lflag>=numberofpoints) return ll;
1291 //_____________________________________________________________________________
1292 void AliITStrackerSA::SetWindowSizes(Int_t n, Double_t *phi, Double_t *lam){
1293 // Set sizes of the phi and lambda windows used for track finding
1295 if(phi){ // user defined values
1296 fPhiWin = new Double_t[fNloop];
1297 fLambdaWin = new Double_t[fNloop];
1298 for(Int_t k=0;k<fNloop;k++){
1300 fLambdaWin[k]=lam[k];
1303 else { // default values
1305 Double_t phid[33] = {0.002,0.003,0.004,0.0045,0.0047,
1306 0.005,0.0053,0.0055,
1307 0.006,0.0063,0.0065,0.007,0.0073,0.0075,0.0077,
1308 0.008,0.0083,0.0085,0.0087,0.009,0.0095,0.0097,
1309 0.01,0.0105,0.011,0.0115,0.012,0.0125,0.013,0.0135,0.0140,0.0145};
1310 Double_t lambdad[33] = {0.003,0.004,0.005,0.005,0.005,
1312 0.006,0.006,0.006,0.007,0.007,0.007,0.007,
1313 0.007,0.007,0.007,0.007,0.007,0.007,0.007,
1314 0.008,0.008,0.008,0.008,0.008,0.008,0.008,0.008,0.008,0.008};
1321 fPhiWin = new Double_t[fNloop];
1322 fLambdaWin = new Double_t[fNloop];
1324 for(Int_t k=0;k<fNloop;k++){
1326 fLambdaWin[k]=lambdad[k];