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Another Standalone ITS tracker (E. Crescio)
[u/mrichter/AliRoot.git] / ITS / AliITStrackerSA.cxx
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13918578 1/**************************************************************************
2 * Copyright(c) 1998-2003, 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 **************************************************************************/
15
16////////////////////////////////////////////////////
17// Stand alone tracker class //
18// Origin: Elisabetta Crescio //
19// e-mail: crescio@to.infn.it //
20// tracks are saved as AliITStrackV2 objects //
21////////////////////////////////////////////////////
22
23//#include <stdlib.h>
24#include "TArrayI.h"
25#include <TBranch.h>
26#include <TMath.h>
27#include <TObjArray.h>
28#include <TTree.h>
29#include "AliRun.h"
30#include "AliITSclusterTable.h"
31#include "AliITSclusterV2.h"
32#include "AliITSgeom.h"
33#include "AliITSRiemannFit.h"
34#include "AliITStrackerSA.h"
35#include "AliITStrackSA.h"
36#include "AliITSVertexer.h"
37#include "AliITSVertex.h"
38
39
40ClassImp(AliITStrackerSA)
41
42//____________________________________________________________________________
43AliITStrackerSA::AliITStrackerSA():AliITStrackerV2(){
44 // Default constructor
45 Init();
46}
47//____________________________________________________________________________
48AliITStrackerSA::AliITStrackerSA(AliITSgeom *geom, AliITSVertex *vert):AliITStrackerV2(geom)
49{
50 // Standard constructor (Vertex is known and passed to this obj.)
51 Init();
52 fVert = vert;
53 fGeom = geom;
54}
55
56//______________________________________________________________________
57AliITStrackerSA::AliITStrackerSA(const AliITStrackerSA &trkr) :
58 AliITStrackerV2(trkr) {
59 // Copy constructor
60 // Copies are not allowed. The method is protected to avoid misuse.
61 Error("AliITStrackerSA","Copy constructor not allowed\n");
62}
63
64//______________________________________________________________________
65AliITStrackerSA& AliITStrackerSA::operator=(const
66 AliITStrackerSA& /* trkr */){
67 // Assignment operator
68 // Assignment is not allowed. The method is protected to avoid misuse.
69 Error("= operator","Assignment operator not allowed\n");
70 return *this;
71}
72
73//____________________________________________________________________________
74AliITStrackerSA::AliITStrackerSA(AliITSgeom *geom, AliITSVertexer *vertexer):AliITStrackerV2(geom)
75{
76 // Standard constructor (Vertex is unknown - vertexer is passed to this obj)
77 Init();
78 fVertexer = vertexer;
79 fGeom = geom;
80}
81
82//____________________________________________________________________________
83AliITStrackerSA::AliITStrackerSA(AliITStrackerSA& tracker):AliITStrackerV2(){
84 // Copy constructor
85 fPhiEstimate = tracker.fPhiEstimate;
86 for(Int_t i=0;i<2;i++){
87 fPoint1[i]=tracker.fPoint1[i];
88 fPoint2[i]=tracker.fPoint2[i];
89 fPoint3[i]=tracker.fPoint3[i];
90 fPointc[i]=tracker.fPointc[i];
91 }
92 fLambdac = tracker.fLambdac;
93 fPhic = tracker.fPhic;
94 fCoef1 = tracker.fCoef1;
95 fCoef2 = tracker.fCoef2;
96 fCoef3 = tracker.fCoef3;
97 fNloop = tracker.fNloop;
98 fPhiWin = tracker.fPhiWin;
99 fLambdaWin = tracker.fLambdaWin;
100 if(tracker.fVertexer && tracker.fVert){
101 fVert = new AliITSVertex(*tracker.fVert);
102 }
103 else {
104 fVert = tracker.fVert;
105 }
106 fVertexer = tracker.fVertexer;
107 fGeom = tracker.fGeom;
108 fFlagLoad = tracker.fFlagLoad;
109 fTable = tracker.fTable;
110}
111
112//____________________________________________________________________________
113AliITStrackerSA::~AliITStrackerSA(){
114 // destructor
115 // if fVertexer is not null, the AliITSVertex obj. is owned by this class
116 // and is deleted here
117 if(fVertexer){
118 if(fVert)delete fVert;
119 }
120 fVert = 0;
121 fVertexer = 0;
122 fGeom = 0;
123 fFlagLoad = 0;
124 if(fPhiWin)delete []fPhiWin;
125 if(fLambdaWin)delete []fLambdaWin;
126 fTable =0;
127}
128
129//____________________________________________________________________________
130void AliITStrackerSA::Init(){
131 // Reset all data members
132 fPhiEstimate=0;
133 for(Int_t i=0;i<3;i++){fPoint1[i]=0;fPoint2[i]=0;fPoint3[i]=0;}
134 fLambdac=0;
135 fPhic=0;
136 fCoef1=0;
137 fCoef2=0;
138 fCoef3=0;
139 fPointc[0]=0;
140 fPointc[1]=0;
141 fVert = 0;
142 fVertexer = 0;
143 fGeom = 0;
144 fFlagLoad = 0;
145 SetWindowSizes();
146 fTable = 0;
147}
148//_______________________________________________________________________
149void AliITStrackerSA::ResetForFinding(){
150 // Reset data members used in all loops during track finding
151 fPhiEstimate=0;
152 for(Int_t i=0;i<3;i++){fPoint1[i]=0;fPoint2[i]=0;fPoint3[i]=0;}
153 fLambdac=0;
154 fPhic=0;
155 fCoef1=0;
156 fCoef2=0;
157 fCoef3=0;
158 fPointc[0]=0;
159 fPointc[1]=0;
160}
161//____________________________________________________________________________
162void AliITStrackerSA::FindTracks(TTree *clusterTree, TTree *out,Int_t evnumber,char *opt){
163
164 /**************************************************************************
165 * Options: to use only ITS execute FindTracks *
166 * to define good tracks with 6 points out of 6 in the ITS write *
167 * *opt="6/6". The default is *opt="6/6" *
168 * *
169 * *
170 * Example: to execute function with only the ITS (no combined tracking *
171 * with TPC+ITS) and requiring 5/6 points to define a good track *
172 * use: FindTracks(treein,treeout,evnumber,"5/6") *
173 * to execute combined tracking, before using FindTracks use *
174 * UseFoundTracksV2 *
175 *************************************************************************/
176
177 //options
178 TString choice(opt);
179 Bool_t sixpoints= choice.Contains("6/6");
180
181 //Fill array with cluster indices for each module
182 if(!fTable){
183 fTable = new AliITSclusterTable(fGeom,this);
184 fTable->FillArray(clusterTree,evnumber);
185 }
186 //Get primary vertex
187 if(fVertexer){
188 if(fVert)delete fVert;
189 fVert = fVertexer->FindVertexForCurrentEvent(evnumber);
190 }
191 else {
192 gAlice->GetEvent(evnumber);
193 if(!fVert){
194 Fatal("FindTracks","Vertex is missing\n");
195 return;
196 }
197 }
198 Double_t primaryVertex[3];
199 Double_t errorsprimvert[3];
200 fVert->GetXYZ(primaryVertex);
201 fVert->GetSigmaXYZ(errorsprimvert);
202 if(errorsprimvert[0]==0 || errorsprimvert[1]==0){
203 Warning("FindTracks","Set errors on vertex positions x and y at 0.0001");
204 errorsprimvert[0]=0.0001;
205 errorsprimvert[1]=0.0001;
206 }
207 fVert->PrintStatus();
208
209 SetEventNumber(evnumber);
210 if(GetFlagLoadedClusters()==0) LoadClusters(clusterTree);
211
212//Fill tree for found tracks
213 AliITStrackV2* outrack=0;
214 TBranch* branch=out->Branch("Tracks","AliITStrackV2",&outrack,32000,0);
215 if (!branch) out->Branch("tracks","AliITStrackV2",&outrack,32000,3);
216 else branch->SetAddress(&outrack);
217
218
219 Int_t firstmod[fGeom->GetNlayers()];
220 for(Int_t i=0;i<fGeom->GetNlayers();i++){
221 firstmod[i]=fGeom->GetModuleIndex(i+1,1,1);
222 }
223 // firstmod [i] number of the first module in the ITS layer i.
224
225 AliITSlayer &layer=fgLayers[0]; // first layer
226 Int_t ntrack=0;
227 //loop on the different windows
228 for(Int_t nloop=0;nloop<fNloop;nloop++){
229 Int_t ncl=layer.GetNumberOfClusters();
230 while(ncl--){ //loop starting from layer 0
231 ResetForFinding();
232 Int_t pflag=0;
233 AliITSclusterV2* cl = layer.GetCluster(ncl);
234 if(cl->IsUsed()==1) continue;
235 Double_t x,y,z;
236 Int_t module = cl->GetDetectorIndex()+firstmod[0];
237 GetClusterGCoordinates(cl,module,x,y,z);
238 fPhic = TMath::ATan2(y,x);
239 fLambdac = TMath::ATan2(z-primaryVertex[2],TMath::Sqrt((x-primaryVertex[0])*(x-primaryVertex[0])+(y-primaryVertex[1])*(y-primaryVertex[1])));
240 fPhiEstimate = fPhic;
241 AliITStrackSA* trs = new AliITStrackSA();
242 fPoint1[0]=primaryVertex[0];
243 fPoint1[1]=primaryVertex[1];
244 fPoint2[0]=x;
245 fPoint2[1]=y;
246
247 Int_t nn[fGeom->GetNlayers()];//counter for clusters on each layer
248 for(Int_t i=0;i<fGeom->GetNlayers();i++){ nn[i]=0;}
249 nn[0] = SearchClusters(0,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],primaryVertex[1],primaryVertex[0],pflag,fTable);
250 nn[1] = SearchClusters(1,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],primaryVertex[1],primaryVertex[0],pflag,fTable);
251
252 if(nn[1]>0){
253 pflag=1;
254 fPoint3[0] = fPointc[0];
255 fPoint3[1] = fPointc[1];
256 }
257 nn[2] = SearchClusters(2,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],primaryVertex[1],primaryVertex[0],pflag,fTable);
258 if(nn[1]==0 && nn[2]==0) pflag=0;
259 if(nn[2]!=0 && nn[1]!=0){ pflag=1; UpdatePoints();}
260 if(nn[2]!=0 && nn[1]==0){
261 pflag=1;
262 fPoint3[0]=fPointc[0];
263 fPoint3[1]=fPointc[1];
264 }
265
266 nn[3] = SearchClusters(3,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],primaryVertex[1],primaryVertex[0],pflag,fTable);
267 pflag=1;
268 if(nn[3]!=0) UpdatePoints();
269 nn[4] = SearchClusters(4,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],primaryVertex[1],primaryVertex[0],pflag,fTable);
270 pflag=1;
271 if(nn[4]!=0) UpdatePoints();
272 nn[5] = SearchClusters(5,fPhiWin[nloop],fLambdaWin[nloop],trs,primaryVertex[2],primaryVertex[1],primaryVertex[0],pflag,fTable);
273
274
275 Int_t layOK=0;
276 Int_t numberofpoints;
277 if(sixpoints) numberofpoints=6; //check of the candidate track
278 else numberofpoints=5; //if track is good (with the required number
279 for(Int_t nnp=0;nnp<fGeom->GetNlayers();nnp++){ //of points) it is written on file
280 if(nn[nnp]!=0) layOK+=1;
281 }
282 if(layOK>=numberofpoints){
283 AliITStrackV2* tr2 = FitTrack(trs,primaryVertex,errorsprimvert,opt);
284 if(tr2==0){
285 Int_t nct = trs->GetNumberOfClustersSA();
286 while(nct--){
287 Int_t index = trs->GetClusterIndexSA(nct);
288 AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
289 if(kl->IsUsed()==1) kl->Use();
290 }
291 continue;
292 }
293 outrack=tr2;
294 out->Fill();
295 ntrack++;
296 Int_t nct = tr2->GetNumberOfClusters();
297
298 while(nct--){
299 Int_t index = tr2->GetClusterIndex(nct);
300 AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
301 if(kl->IsUsed()==0) kl->Use();
302
303 }
304 }
305 else{
306 Int_t nct = trs->GetNumberOfClustersSA();
307 while(nct--){
308 Int_t index = trs->GetClusterIndexSA(nct);
309 AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
310 if(kl->IsUsed()==1) kl->Use();
311 }
312 }
313 delete trs;
314
315 }//end loop on clusters of layer1
316
317 }//end loop2
318
319 //if 5/6 points are required, second loop starting
320 //from second layer, to find tracks with point of
321 //layer 1 missing
322
323 if(!sixpoints){
324 // counter for clusters on each layer
325 Int_t *nn = new Int_t[fGeom->GetNlayers()-1];
326 for(Int_t nloop=0;nloop<fNloop;nloop++){
327 AliITSlayer &layer2=fgLayers[1]; //loop on layer 2
328 Int_t ncl2=layer2.GetNumberOfClusters();
329 while(ncl2--){ //loop starting from layer 2
330 ResetForFinding();
331 Int_t pflag=0;
332 AliITSclusterV2* cl = layer2.GetCluster(ncl2);
333 if(cl->IsUsed()==1) continue;
334 Double_t x,y,z;
335 Int_t module = cl->GetDetectorIndex()+firstmod[1];
336 GetClusterGCoordinates(cl,module,x,y,z);
337 fPhic = TMath::ATan2(y,x);
338 fLambdac = TMath::ATan2(z-primaryVertex[2],TMath::Sqrt((x-primaryVertex[0])*(x-primaryVertex[0])+(y-primaryVertex[1])*(y-primaryVertex[1])));
339
340 fPhiEstimate = fPhic;
341 AliITStrackSA* trs = new AliITStrackSA();
342
343 fPoint1[0]=primaryVertex[0];
344 fPoint1[1]=primaryVertex[1];
345 fPoint2[0]=x;
346 fPoint2[1]=y;
347
348 for(Int_t kk=0;kk<fGeom->GetNlayers()-1;kk++)nn[kk] = 0;
349 for(Int_t kk=0;kk<fGeom->GetNlayers()-1;kk++){
350 nn[kk] = SearchClusters(kk+1,fPhiWin[nloop],fLambdaWin[nloop],
351 trs,primaryVertex[2],primaryVertex[1],primaryVertex[0],pflag,fTable);
352 if(nn[kk]==0)break;
353 if(kk>0){
354 UpdatePoints();
355 pflag = 1;
356 }
357 }
358 Int_t fl=0;
359 for(Int_t nnp=0;nnp<fGeom->GetNlayers()-1;nnp++){
360 if(nn[nnp]!=0) fl+=1;
361 }
362 if(fl>=5){ // 5/6
363 AliITStrackV2* tr2 = FitTrack(trs,primaryVertex,errorsprimvert,opt);
364 if(tr2==0){
365 Int_t nct = trs->GetNumberOfClustersSA();
366 while(nct--){
367 Int_t index = trs->GetClusterIndexSA(nct);
368 AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
369 if(kl->IsUsed()==1) kl->Use();
370 }
371 continue;
372 }
373 outrack=tr2;
374 out->Fill();
375 Int_t nct = tr2->GetNumberOfClusters();
376 while(nct--){
377 Int_t index = tr2->GetClusterIndex(nct);
378 AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
379 if(kl==0) continue;
380 if(kl->IsUsed()==0) kl->Use();
381 }
382 }
383 else{
384 Int_t nct = trs->GetNumberOfClustersSA();
385 while(nct--){
386 Int_t index = trs->GetClusterIndexSA(nct);
387 AliITSclusterV2* kl = (AliITSclusterV2*)GetCluster(index);
388 if(kl==0) continue;
389 if(kl->IsUsed()==1) kl->Use();
390 }
391 }
392 delete trs;
393 }//end loop on clusters of layer2
394 }
395 delete []nn;
396 } //end opt="5/6"
397
398
399 UnloadClusters();
400}
401//_______________________________________________________________________
402void AliITStrackerSA::UseFoundTracksV2(Int_t evnum,TTree* treev2, TTree* clustertree){
403 // Marks as used clusters belonging to tracks found with V2 TPC+ITS tracking
404 if(!fTable){
405 fTable = new AliITSclusterTable(fGeom,this);
406 fTable->FillArray(clustertree,evnum);
407 }
408 LoadClusters(clustertree);
409 SetFlagLoadedClusters(1);
410
411 TBranch* bra = (TBranch*)treev2->GetBranch("tracks");
412 if(!bra) Warning("UseFoundTracksV2","No branch for track tree");
413 AliITStrackV2* ttrrt = new AliITStrackV2;
414 bra->SetAddress(&ttrrt);
415
416 for(Int_t nj=0;nj<treev2->GetEntries();nj++){
417 treev2->GetEvent(nj);
418 Int_t ncl = ttrrt->GetNumberOfClusters();
419 for(Int_t k=0;k<ncl;k++){
420 Int_t index = ttrrt->GetClusterIndex(k);
421 AliITSclusterV2* clui = (AliITSclusterV2*)GetCluster(index);
422 if(clui->IsUsed()==0) clui->Use();
423 }
424 }
425 delete ttrrt;
426
427}
428
429//________________________________________________________________________
430
431AliITStrackV2* AliITStrackerSA::FitTrack(AliITStrackSA* tr,Double_t *primaryVertex,Double_t *errorsprimvert,char *opt){
432 //fit of the found track
433
434//options
435 TString choice(opt);
436 Bool_t sixpoints= choice.Contains("6/6");
437
438 Int_t firstmod[fGeom->GetNlayers()];
439 for(Int_t i=0;i<fGeom->GetNlayers();i++){
440 firstmod[i]=fGeom->GetModuleIndex(i+1,1,1);
441 }
442 TObjArray* listoftracks=new TObjArray(0,0);
443 AliITStrackV2* otrack2;
444 Int_t nclusters = tr->GetNumberOfClustersSA();
445 TObjArray** listlayer = new TObjArray*[fGeom->GetNlayers()];
446 for(Int_t i=0;i<fGeom->GetNlayers();i++){
447 listlayer[i] = new TObjArray(0,0);
448 }
449
450 TArrayI clind0(20);
451 TArrayI clind1(20);
452 TArrayI clind2(20);
453 TArrayI clind3(20);
454 TArrayI clind4(20);
455 TArrayI clind5(20);
456
457 Int_t nnn[fGeom->GetNlayers()];
458 for(Int_t i=0;i<fGeom->GetNlayers();i++)nnn[i]=0;
459
460 for(Int_t ncl=0;ncl<nclusters;ncl++){
461 Int_t index = tr->GetClusterIndexSA(ncl);
462 AliITSclusterV2* cl = (AliITSclusterV2*)GetCluster(index);
463 if(cl->IsUsed()==1) cl->Use();
464 Int_t lay = (index & 0xf0000000) >> 28;
465 if(lay==0) { listlayer[0]->AddLast(cl); clind0[nnn[0]]=index;nnn[0]++;}
466 if(lay==1) { listlayer[1]->AddLast(cl); clind1[nnn[1]]=index;nnn[1]++;}
467 if(lay==2) { listlayer[2]->AddLast(cl); clind2[nnn[2]]=index;nnn[2]++;}
468 if(lay==3) { listlayer[3]->AddLast(cl); clind3[nnn[3]]=index;nnn[3]++;}
469 if(lay==4) { listlayer[4]->AddLast(cl); clind4[nnn[4]]=index;nnn[4]++;}
470 if(lay==5) { listlayer[5]->AddLast(cl); clind5[nnn[5]]=index;nnn[5]++;}
471 }
472
473
474 Int_t end[fGeom->GetNlayers()];
475 for(Int_t i=0;i<fGeom->GetNlayers();i++){
476 if(listlayer[i]->GetEntries()==0) end[i]=1;
477 else end[i]=listlayer[i]->GetEntries();
478 }
479
480 for(Int_t l1=0;l1<end[0];l1++){//loop on layer 1
481 AliITSclusterV2* cl0 = (AliITSclusterV2*)listlayer[0]->At(l1);
482 TVector3** recp = new TVector3*[3];
483 TVector3** errs = new TVector3*[3];
484 recp[0] = new TVector3(primaryVertex[0],primaryVertex[1],primaryVertex[2]);
485 errs[0] = new TVector3(errorsprimvert[0],errorsprimvert[1],errorsprimvert[2]);
486 Double_t x1,y1,z1,sx1,sy1,sz1;
487 Double_t x2,y2,z2,sx2,sy2,sz2;
488 AliITSclusterV2* p1=0;
489 AliITSclusterV2* p2=0;
490
491 for(Int_t l2=0;l2<end[1];l2++){//loop on layer 2
492 AliITSclusterV2* cl1 = (AliITSclusterV2*)listlayer[1]->At(l2);
493 for(Int_t l3=0;l3<end[2];l3++){ //loop on layer 3
494 AliITSclusterV2* cl2 = (AliITSclusterV2*)listlayer[2]->At(l3);
495
496 if(cl0==0 && cl1!=0) {
497 p2 = cl2;
498 p1=cl1;
499
500 }
501 if(cl0!=0 && cl1==0){
502 p1=cl0;
503 p2=cl2;
504 }
505 if(cl0!=0 && cl1!=0){
506 p1=cl0;
507 p2=cl1;
508 }
509 Int_t module1 = p1->GetDetectorIndex()+firstmod[0];
510 Int_t module2 = p2->GetDetectorIndex()+firstmod[1];
511 GetClusterGCoordinates(p1,module1,x1,y1,z1);
512 GetClusterGCoordinates(p2,module2,x2,y2,z2);
513 GetClusterGErrors(p1,module1,sx1,sy1,sz1);
514 GetClusterGErrors(p2,module2,sx2,sy2,sz2);
515 Double_t phi1=TMath::ATan2(y1,x1);
516 recp[1] = new TVector3(x1,y1,z1);
517 errs[1] = new TVector3(sx1,sy1,sz1);
518 recp[2] = new TVector3(x2,y2,z2);
519 errs[2] = new TVector3(sx2,sy2,sz2);
520
521 //fit on the Riemann sphere
522 Float_t seed1,seed2,seed3;
523 AliITSRiemannFit fit;
524 Int_t rf = fit.FitHelix(3,recp,errs,seed1,seed2,seed3); //this gives phi,tgl,curvature to start Kalman Filter
525 if(rf==0) continue;
526 Double_t phi=seed1;
527 Double_t tgl=seed2;
528
529 if(phi1>0){
530 if(seed1>-TMath::Pi() && seed1<-0.5*TMath::Pi()){
531 phi=seed1+1.5*TMath::Pi();
532 tgl=seed2;
533 }
534 if(seed1>-0.5*TMath::Pi() && seed1<0.5*TMath::Pi()){
535 phi=seed1+0.5*TMath::Pi();
536 tgl=(-1)*seed2;
537 }
538 if(seed1>0.5*TMath::Pi() && seed1<TMath::Pi()){
539 phi=seed1-0.5*TMath::Pi();
540 tgl=seed2;
541 }
542 }
543 if(phi1<0){
544 if(seed1>-TMath::Pi() && seed1<-0.5*TMath::Pi()){
545 phi=seed1+0.5*TMath::Pi();
546 tgl=(-1)*seed2;
547 }
548 if(seed1>-0.5*TMath::Pi() && seed1<0.5*TMath::Pi()){
549 phi=seed1-0.5*TMath::Pi();
550 tgl=seed2;
551 }
552 if(seed1>0.5*TMath::Pi() && seed1<TMath::Pi()){
553 phi=seed1-1.5*TMath::Pi();
554 tgl=(-1)*seed2;
555 }
556 }
557
558 Int_t layer,ladder,detector;
559 fGeom->GetModuleId(module1,layer,ladder,detector);
560 Float_t yclu1 = p1->GetY();
561 Float_t zclu1 = p1->GetZ();
562 Double_t cv=Curvature(primaryVertex[0],primaryVertex[1],x1,y1,x2,y2);
563
564 for(Int_t l4=0;l4<end[3];l4++){ //loop on layer 4
565 AliITSclusterV2* cl3 = (AliITSclusterV2*)listlayer[3]->At(l4);
566 for(Int_t l5=0;l5<end[4];l5++){ //loop on layer 5
567 AliITSclusterV2* cl4 = (AliITSclusterV2*)listlayer[4]->At(l5);
568 for(Int_t l6=0;l6<end[5];l6++){ //loop on layer 6
569 AliITSclusterV2* cl5 = (AliITSclusterV2*)listlayer[5]->At(l6);
570 AliITStrackSA* trac = new AliITStrackSA(layer,ladder,detector,yclu1,zclu1,phi,tgl,cv,1);
571
572 if(cl5!=0) trac->AddClusterV2(5,(clind5[l6] & 0x0fffffff)>>0);
573 if(cl4!=0) trac->AddClusterV2(4,(clind4[l5] & 0x0fffffff)>>0);
574 if(cl3!=0) trac->AddClusterV2(3,(clind3[l4] & 0x0fffffff)>>0);
575 if(cl2!=0) trac->AddClusterV2(2,(clind2[l3] & 0x0fffffff)>>0);
576 if(cl1!=0) trac->AddClusterV2(1,(clind1[l2] & 0x0fffffff)>>0);
577 if(cl0!=0) trac->AddClusterV2(0,(clind0[l1] & 0x0fffffff)>>0);
578
579 //fit with Kalman filter using AliITStrackerV2::RefitAt()
580
581 AliITStrackV2* ot = new AliITStrackV2(*trac);
582
583 ot->ResetCovariance();
584 ot->ResetClusters();
585
586 if(RefitAt(49.,ot,trac)){ //fit from layer 1 to layer 6
587
588 otrack2 = new AliITStrackV2(*ot);
589 otrack2->ResetCovariance();
590 otrack2->ResetClusters();
591 //fit from layer 6 to layer 1
592 if(RefitAt(3.7,otrack2,ot)) listoftracks->AddLast(otrack2);
593
594 }
595
596 delete ot;
597 delete trac;
598 }//end loop layer 6
599 }//end loop layer 5
600 }//end loop layer 4
601
602 for(Int_t i=1;i<3;i++){
603 delete recp[i];
604 delete errs[i];
605 }
606 }//end loop layer 3
607 }//end loop layer 2
608 delete recp[0];
609 delete errs[0];
610 delete[] recp;
611 delete[] errs;
612 }//end loop layer 1
613
614 Int_t dim=listoftracks->GetEntries();
615 if(dim==0){
616 delete listoftracks;
617 for(Int_t i=0;i<fGeom->GetNlayers();i++){
618 delete listlayer[i];
619 }
620 delete listlayer;
621 return 0;
622 }
623
624 AliITStrackV2* otrack =(AliITStrackV2*)FindTrackLowChiSquare(listoftracks,dim);
625
626 if(otrack==0) return 0;
627 Int_t indexc[fGeom->GetNlayers()];
628 for(Int_t i=0;i<fGeom->GetNlayers();i++) indexc[i]=0;
629 for(Int_t nind=0;nind<otrack->GetNumberOfClusters();nind++){
630 indexc[nind] = otrack->GetClusterIndex(nind);
631 }
632 AliITSclusterV2* cl0 = (AliITSclusterV2*)GetCluster(indexc[0]);
633 AliITSclusterV2* cl1 = (AliITSclusterV2*)GetCluster(indexc[1]);
634 AliITSclusterV2* cl2 = (AliITSclusterV2*)GetCluster(indexc[2]);
635 AliITSclusterV2* cl3 = (AliITSclusterV2*)GetCluster(indexc[3]);
636 AliITSclusterV2* cl4 = (AliITSclusterV2*)GetCluster(indexc[4]);
637 Int_t labl[3]={-1,-1,-1};
638 if(otrack->GetNumberOfClusters()==fGeom->GetNlayers()){
639 AliITSclusterV2* cl5 = (AliITSclusterV2*)GetCluster(indexc[5]);
640 labl[0]=cl5->GetLabel(0);
641 labl[1]=cl5->GetLabel(1);
642 labl[2]=cl5->GetLabel(2);
643 }
644 if(otrack->GetNumberOfClusters()==(fGeom->GetNlayers()-1)){
645 labl[0]=-1;
646 labl[1]=-1;
647 labl[2]=-1;
648 }
649 Int_t numberofpoints;
650 if(sixpoints) numberofpoints=6;
651 else numberofpoints=5;
652 Int_t label = Label(cl0->GetLabel(0),cl1->GetLabel(0),
653 cl2->GetLabel(0),cl3->GetLabel(0),
654 cl4->GetLabel(0),labl[0],
655 cl0->GetLabel(1),cl1->GetLabel(1),
656 cl2->GetLabel(1),cl3->GetLabel(1),
657 cl4->GetLabel(1),labl[1],
658 cl0->GetLabel(2),cl1->GetLabel(2),
659 cl2->GetLabel(2),cl3->GetLabel(2),
660 cl4->GetLabel(2),labl[2],numberofpoints);
661
662 otrack->SetLabel(label);
663 delete listoftracks;
664 for(Int_t i=0;i<fGeom->GetNlayers();i++){
665 delete listlayer[i];
666 }
667 delete listlayer;
668 return otrack;
669
670}
671
672//________________________________________________________________
673void AliITStrackerSA::UpdatePoints(){
674 //update of points for the estimation of the curvature
675
676 fPoint1[0]=fPoint2[0];
677 fPoint1[1]=fPoint2[1];
678 fPoint2[0]=fPoint3[0];
679 fPoint2[1]=fPoint3[1];
680 fPoint3[0]=fPointc[0];
681 fPoint3[1]=fPointc[1];
682
683
684}
685
686//_________________________________________________________________
687
688Int_t AliITStrackerSA::SearchClusters(Int_t layer,Double_t phiwindow,Double_t lambdawindow, AliITStrackSA* trs,Double_t zvertex,Double_t yvertex,Double_t xvertex,Int_t pflag,AliITSclusterTable* table){
689 //function used to to find the clusters associated to the track
690 Int_t nc=0;
691 AliITSlayer &lay = fgLayers[layer];
692 Int_t firstmod[fGeom->GetNlayers()];
693 for(Int_t i=0;i<fGeom->GetNlayers();i++){
694 firstmod[i]=fGeom->GetModuleIndex(i+1,1,1);
695 }
696 if(pflag==1){
697
698 Float_t cx1,cx2,cy1,cy2;
699 FindEquation(fPoint1[0],fPoint1[1],fPoint2[0],fPoint2[1],fPoint3[0],fPoint3[1],fCoef1,fCoef2,fCoef3);
700 Int_t fun = FindIntersection(fCoef1,fCoef2,fCoef3,-(lay.GetR()*lay.GetR()),cx1,cy1,cx2,cy2);
701 if(fun==0) return 0;
702 Double_t fi1 =TMath::ATan2(cy1,cx1);
703 Double_t fi2 =TMath::ATan2(cy2,cx2);
704 fPhiEstimate = ChoosePoint(fi1,fi2,fPhic);
705 }
706
707 Double_t zed = TMath::Tan(fLambdac)*lay.GetR()+zvertex;
708 Double_t zed1 = TMath::Tan(fLambdac+lambdawindow)*lay.GetR()+zvertex;
709 Double_t zed2 = TMath::Tan(fLambdac-lambdawindow)*lay.GetR()+zvertex;
710
711 Double_t fi = fPhiEstimate;
712 Int_t nmod = lay.FindDetectorIndex(fi,zed)+firstmod[layer];
713
714 Int_t nm[8]={0,0,0,0,0,0,0,0};
715 nm[0] = lay.FindDetectorIndex(fi+phiwindow,zed)+firstmod[layer];
716 nm[1] = lay.FindDetectorIndex(fi-phiwindow,zed)+firstmod[layer];
717 nm[2] = lay.FindDetectorIndex(fi,zed1)+firstmod[layer];
718 nm[3] = lay.FindDetectorIndex(fi,zed2)+firstmod[layer];
719 nm[4] = lay.FindDetectorIndex(fi+phiwindow,zed1)+firstmod[layer];
720 nm[5] = lay.FindDetectorIndex(fi-phiwindow,zed1)+firstmod[layer];
721 nm[6] = lay.FindDetectorIndex(fi+phiwindow,zed2)+firstmod[layer];
722 nm[7] = lay.FindDetectorIndex(fi-phiwindow,zed2)+firstmod[layer];
723
724
725 if(nmod<0) return 0;
726 Int_t nn=0;
727 TArrayI* array =(TArrayI*)table->GetListOfClusters(nmod);
728 TArrayI* list = new TArrayI(array->GetSize());
729 for(Int_t i=0;i<array->GetSize();i++){
730 Int_t in=(Int_t)array->At(i);
731 list->AddAt(in,nn);
732 nn++;
733 }
734
735 for(Int_t ii=0;ii<8;ii++){
736 if(nm[ii]!=nmod && nm[ii]>=0){
737 TArrayI* ar =(TArrayI*)table->GetListOfClusters(nm[ii]);
738 list->Set(list->GetSize()+ar->GetSize());
739 for(Int_t j=0;j<ar->GetSize();j++){
740 Int_t in=(Int_t)ar->At(j);
741 list->AddAt(in,nn);
742 nn++;
743 }
744 }
745 }
746 for(Int_t i=0;i<list->GetSize();i++){
747 Int_t index = (Int_t)list->At(i);
748 AliITSclusterV2* cllay = lay.GetCluster(index);
749 if(cllay==0) continue;
750 if(cllay->IsUsed()==1) continue;
751
752 Double_t x,y,z;
753 Int_t modlay = cllay->GetDetectorIndex()+firstmod[layer];
754 GetClusterGCoordinates(cllay,modlay,x,y,z);
755 Double_t phi = TMath::ATan2(y,x);
756 Double_t lambda=TMath::ATan2(z-zvertex,TMath::Sqrt((x-xvertex)*(x-xvertex)+(y-yvertex)*(y-yvertex)));
757
758
759 if(TMath::Abs(fLambdac-lambda)<lambdawindow &&
760 TMath::Abs(fPhiEstimate-phi)<phiwindow){
761 nc+=1;
762 fLambdac = lambda;
763 if(trs->GetNumberOfClustersSA()==20){
764 delete list;
765 return 0;
766 }
767 trs->AddClusterSA(layer,index);
768 cllay->Use();
769 fPhiEstimate=phi;
770 fPointc[0]=x;fPointc[1]=y;
771 }
772
773 }
774 delete list;
775 return nc;
776
777}
778
779//__________________________________________________________________
780void AliITStrackerSA::GetClusterGCoordinates(AliITSclusterV2* cluster,Int_t module,Double_t& x, Double_t& y, Double_t& z){
781
782 //returns x,y,z of cluster in global coordinates
783
784 Double_t rot[9]; fGeom->GetRotMatrix(module,rot);
785 Int_t lay,lad,det; fGeom->GetModuleId(module,lay,lad,det);
786 Float_t tx,ty,tz; fGeom->GetTrans(lay,lad,det,tx,ty,tz);
787
788 Double_t alpha=TMath::ATan2(rot[1],rot[0])+TMath::Pi();
789 Double_t phi=TMath::Pi()/2+alpha;
790 if (lay==1) phi+=TMath::Pi();
791
792 Double_t cp=TMath::Cos(phi), sp=TMath::Sin(phi);
793 Double_t r=tx*cp+ty*sp;
794
795 x= r*cp - cluster->GetY()*sp;
796 y= r*sp + cluster->GetY()*cp;
797 z=cluster->GetZ();
798
799
800
801}
802//__________________________________________________________________
803void AliITStrackerSA::GetClusterGErrors(AliITSclusterV2* cluster,Int_t module,Double_t& sigmax, Double_t& sigmay, Double_t& sigmaz){
804
805 //returns x,y,z of cluster in global coordinates
806
807 Double_t rot[9]; fGeom->GetRotMatrix(module,rot);
808 Int_t lay,lad,det; fGeom->GetModuleId(module,lay,lad,det);
809
810 Double_t alpha=TMath::ATan2(rot[1],rot[0])+TMath::Pi();
811 Double_t phi=TMath::Pi()/2+alpha;
812 if (lay==1) phi+=TMath::Pi();
813
814 Double_t cp=TMath::Cos(phi), sp=TMath::Sin(phi);
815
816
817 sigmax = TMath::Sqrt(sp*sp*cluster->GetSigmaY2());
818 sigmay = TMath::Sqrt(cp*cp*cluster->GetSigmaY2());
819 sigmaz = TMath::Sqrt(cluster->GetSigmaZ2());
820}
821
822//___________________________________________________________________
823Int_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){
824
825 //given (x,y) of three recpoints (in global coordinates)
826 //returns the parameters a,b,c of circonference x*x + y*y +a*x + b*y +c
827
828 Float_t den = (x3-x1)*(y2-y1)-(x2-x1)*(y3-y1);
829 if(den==0) return 0;
830 a = ((y3-y1)*(x2*x2+y2*y2-x1*x1-y1*y1)-(y2-y1)*(x3*x3+y3*y3-x1*x1-y1*y1))/den;
831 b = -(x2*x2-x1*x1+y2*y2-y1*y1+a*(x2-x1))/(y2-y1);
832 c = -x1*x1-y1*y1-a*x1-b*y1;
833 return 1;
834 }
835//__________________________________________________________________________
836 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){
837
838 //Finds the intersection between the circonference of the track and the circonference centered in (0,0) represented by one layer
839 //c2 is -rlayer*rlayer
840
841 if(a1==0) return 0;
842 Float_t m = c2-c1;
843 Float_t aA = (b1*b1)/(a1*a1)+1;
844 Float_t bB = (-2*m*b1/(a1*a1));
845 Float_t cC = c2+(m*m)/(a1*a1);
846 if((bB*bB-4*aA*cC)<0) return 0;
847
848 y1 = (-bB+TMath::Sqrt(bB*bB-4*aA*cC))/(2*aA);
849 y2 = (-bB-TMath::Sqrt(bB*bB-4*aA*cC))/(2*aA);
850 x1 = (c2-c1-b1*y1)/a1;
851 x2 = (c2-c1-b1*y2)/a1;
852
853 return 1;
854}
855//____________________________________________________________________
856Double_t AliITStrackerSA::Curvature(Double_t x1,Double_t y1,Double_t
857x2,Double_t y2,Double_t x3,Double_t y3){
858
859 //calculates the curvature of track
860 Double_t den = (x3-x1)*(y2-y1)-(x2-x1)*(y3-y1);
861 if(den==0) return 0;
862 Double_t a = ((y3-y1)*(x2*x2+y2*y2-x1*x1-y1*y1)-(y2-y1)*(x3*x3+y3*y3-x1*x1-y1*y1))/den;
863 Double_t b = -(x2*x2-x1*x1+y2*y2-y1*y1+a*(x2-x1))/(y2-y1);
864 Double_t c = -x1*x1-y1*y1-a*x1-b*y1;
865 Double_t xc=-a/2.;
866
867 if((a*a+b*b-4*c)<0) return 0;
868 Double_t rad = TMath::Sqrt(a*a+b*b-4*c)/2.;
869 if(rad==0) return 0;
870
871 if((x1>0 && y1>0 && x1<xc)) rad*=-1;
872 if((x1<0 && y1>0 && x1<xc)) rad*=-1;
873 // if((x1<0 && y1<0 && x1<xc)) rad*=-1;
874 // if((x1>0 && y1<0 && x1<xc)) rad*=-1;
875
876 return 1/rad;
877
878}
879//____________________________________________________________________
880Double_t AliITStrackerSA::ChoosePoint(Double_t p1, Double_t p2, Double_t pp){
881
882 //Returns the point closest to pp
883
884 Double_t diff1 = p1-pp;
885 Double_t diff2 = p2-pp;
886
887 if(TMath::Abs(diff1)<TMath::Abs(diff2)) fPhiEstimate=p1;
888 else fPhiEstimate=p2;
889 return fPhiEstimate;
890
891}
892
893
894//_________________________________________________________________
895AliITStrackV2* AliITStrackerSA::FindTrackLowChiSquare(TObjArray* tracklist, Int_t dim) const {
896 // returns track with lowes chi square
897 if(dim==1){
898 AliITStrackV2* trk = (AliITStrackV2*)tracklist->At(0);
899 return trk;
900 }
901 if(dim==0) return 0;
902 Double_t chi2[dim];
903 Int_t index[dim];
904 for(Int_t i=0;i<dim;i++){
905 AliITStrackV2* trk = (AliITStrackV2*)tracklist->At(i);
906 chi2[i]=trk->GetChi2();
907 index[i]=i;
908 }
909
910 Int_t w=0;Double_t value;
911 Int_t lp;
912 while(w<dim){
913 for(Int_t j=w+1;j<dim;j++){
914 if(chi2[w]<chi2[j]){
915 value=chi2[w];
916 chi2[w]=chi2[j];
917 chi2[j]=value;
918 lp=index[w];
919 index[w]=index[j];
920 index[j]=lp;
921 }
922 }
923 w++;
924 }
925
926 AliITStrackV2* trk = (AliITStrackV2*)tracklist->At(index[dim-1]);
927 return trk;
928
929}
930
931//__________________________________________________________
932Int_t AliITStrackerSA::FindLabel(Int_t l1, Int_t l2, Int_t l3, Int_t l4, Int_t l5, Int_t l6){
933
934 //function used to determine the track label
935
936 Int_t lb[6] = {l1,l2,l3,l4,l5,l6};
937 Int_t aa[6]={1,1,1,1,1,1};
938 Int_t ff=0;
939 Int_t ll=0;
940 Int_t k=0;Int_t w=0;Int_t num=6;
941 if(lb[5]==-1) num=5;
942
943 while(k<num){
944
945 for(Int_t i=k+1;i<num;i++){
946
947 if(lb[k]==lb[i] && aa[k]!=0){
948
949 aa[k]+=1;
950 aa[i]=0;
951 }
952 }
953 k++;
954 }
955
956 while(w<num){
957
958 for(Int_t j=0;j<6;j++){
959 if(aa[w]<aa[j]){
960 ff=aa[w];
961 aa[w]=aa[j];
962 aa[j]=ff;
963 ll=lb[w];
964 lb[w]=lb[j];
965 lb[j]=ll;
966 }
967 }
968 w++;
969 }
970 if(num==6) return lb[5];
971 else return lb[4];
972}
973
974//_____________________________________________________________________________
975Int_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,
976Int_t gl12, Int_t gl13, Int_t gl14,Int_t gl15, Int_t gl16, Int_t gl17, Int_t gl18, Int_t numberofpoints){
977
978
979 //function used to assign label to the found track. If track is fake, the label is negative
980
981 Int_t lb0[6] = {gl1,gl2,gl3,gl4,gl5,gl6};
982 Int_t lb1[6] = {gl7,gl8,gl9,gl10,gl11,gl12};
983 Int_t lb2[6] = {gl13,gl14,gl15,gl16,gl17,gl18};
984 Int_t ll=FindLabel(lb0[0],lb0[1],lb0[2],lb0[3],lb0[4],lb0[5]);
985 Int_t lflag=0;Int_t num=6;
986 if(lb0[5]==-1 && lb1[5]==-1 && lb2[5]==-1) num=5;
987
988 for(Int_t i=0;i<num;i++){
989 if(lb0[i]==ll || lb1[i]==ll || lb2[i]==ll) lflag+=1;
990 }
991
992 if(lflag>=numberofpoints) return ll;
993 else return -ll;
994
995
996}
997
998//_____________________________________________________________________________
999void AliITStrackerSA::SetWindowSizes(Int_t n, Double_t *phi, Double_t *lam){
1000 // Set sizes of the phi and lambda windows used for track finding
1001 fNloop = n;
1002 if(phi){ // user defined values
1003 fPhiWin = new Double_t[fNloop];
1004 fLambdaWin = new Double_t[fNloop];
1005 for(Int_t k=0;k<fNloop;k++){
1006 fPhiWin[k]=phi[k];
1007 fLambdaWin[k]=lam[k];
1008 }
1009 }
1010 else { // default values
1011 Double_t phid[46] = {0.001,0.0015,0.002,0.0023,0.0025,0.0027,0.003,
1012 0.0033,0.0035,0.0037,0.004,0.0043,0.0045,0.0047,
1013 0.005,0.0053,0.0055,
1014 0.006,0.0063,0.0065,0.007,0.0073,0.0075,0.0077,
1015 0.008,0.0083,0.0085,0.0087,0.009,0.0095,0.0097,
1016 0.01,0.0105,0.011,0.0115,0.012,0.0125,0.013,0.0135,
1017 0.014,0.0145,0.015,0.0155,0.016,0.0165,0.017};
1018 Double_t lambdad[46] = {0.001,0.0015,0.002,0.0023,0.0025,0.0027,0.003,
1019 0.0033,0.0035,0.0037,0.004,0.0043,0.0045,0.0047,
1020 0.005,0.0053,0.0055,
1021 0.006,0.0063,0.0065,0.007,0.0073,0.0075,0.0077,
1022 0.008,0.0083,0.0085,0.0087,0.009,0.0095,0.0097,
1023 0.01,0.015,0.011,0.0115,0.012,0.0125,0.013,0.0135,
1024 0.014,0.0145,0.015,0.0155,0.016,0.016,0.016};
1025 if(fNloop!=46){
1026 fNloop = 46;
1027 Warning("SetWindowSizes","Number of loop forced to the default value %d",fNloop);
1028 }
1029
1030 fPhiWin = new Double_t[fNloop];
1031 fLambdaWin = new Double_t[fNloop];
1032
1033 for(Int_t k=0;k<fNloop;k++){
1034 fPhiWin[k]=phid[k];
1035 fLambdaWin[k]=lambdad[k];
1036 }
1037
1038 }
1039
1040}
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