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1/**************************************************************************
2 * Copyright(c) 1998-1999, 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// Implementation of the ITS tracker class
18// It reads AliITSRecPoint clusters and creates AliITStrackV2 tracks
19// and fills with them the ESD
20// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
21// dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch
22//-------------------------------------------------------------------------
23
24#include <new>
25
26#include <TError.h>
27#include <TFile.h>
28#include <TTree.h>
29#include <TRandom.h>
30#include <TGeoMatrix.h>
31
32#include "AliITSgeomTGeo.h"
33#include "AliAlignObj.h"
34#include "AliITSRecPoint.h"
35#include "AliESDEvent.h"
36#include "AliITSRecPoint.h"
37#include "AliITSReconstructor.h"
38#include "AliITStrackerV2.h"
39
40ClassImp(AliITStrackerV2)
41
42AliITStrackerV2::AliITSlayer AliITStrackerV2::fgLayers[kMaxLayer]; //ITS layers
43
44AliITStrackerV2::AliITStrackerV2():
45 AliTracker(),
46 fI(kMaxLayer),
47 fBestTrack(),
48 fTrackToFollow(),
49 fPass(0),
50 fLastLayerToTrackTo(kLastLayerToTrackTo)
51{
52 //--------------------------------------------------------------------
53 //This is the AliITStrackerV2 default constructor
54 //--------------------------------------------------------------------
55
56 for (Int_t i=1; i<kMaxLayer+1; i++) new(fgLayers+i-1) AliITSlayer();
57
58 fConstraint[0]=1; fConstraint[1]=0;
59
60 Double_t xyz[]={AliITSReconstructor::GetRecoParam()->GetXVdef(),
61 AliITSReconstructor::GetRecoParam()->GetYVdef(),
62 AliITSReconstructor::GetRecoParam()->GetZVdef()};
63 Double_t ers[]={AliITSReconstructor::GetRecoParam()->GetSigmaXVdef(),
64 AliITSReconstructor::GetRecoParam()->GetSigmaYVdef(),
65 AliITSReconstructor::GetRecoParam()->GetSigmaZVdef()};
66 SetVertex(xyz,ers);
67
68 for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=kLayersNotToSkip[i];
69
70}
71
72AliITStrackerV2::AliITStrackerV2(const AliITStrackerV2 &t):
73 AliTracker(t),
74 fI(t.fI),
75 fBestTrack(t.fBestTrack),
76 fTrackToFollow(t.fTrackToFollow),
77 fPass(t.fPass),
78 fLastLayerToTrackTo(t.fLastLayerToTrackTo)
79{
80 //--------------------------------------------------------------------
81 //This is the AliITStrackerV2 copy constructor
82 //--------------------------------------------------------------------
83
84 //for (Int_t i=1; i<kMaxLayer+1; i++) new(fgLayers+i-1) AliITSlayer();
85
86 fConstraint[0]=t.fConstraint[0]; fConstraint[1]=t.fConstraint[1];
87
88 Double_t xyz[]={AliITSReconstructor::GetRecoParam()->GetXVdef(),
89 AliITSReconstructor::GetRecoParam()->GetYVdef(),
90 AliITSReconstructor::GetRecoParam()->GetZVdef()};
91 Double_t ers[]={AliITSReconstructor::GetRecoParam()->GetSigmaXVdef(),
92 AliITSReconstructor::GetRecoParam()->GetSigmaYVdef(),
93 AliITSReconstructor::GetRecoParam()->GetSigmaZVdef()};
94 xyz[0]=t.GetX(); xyz[1]=t.GetY(); xyz[2]=t.GetZ();
95 ers[0]=t.GetSigmaX(); ers[1]=t.GetSigmaY(); ers[2]=t.GetSigmaZ();
96 SetVertex(xyz,ers);
97
98 for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=t.fLayersNotToSkip[i];
99
100}
101
102AliITStrackerV2::AliITStrackerV2(const Char_t *geom) :
103 AliTracker(),
104 fI(kMaxLayer),
105 fBestTrack(),
106 fTrackToFollow(),
107 fPass(0),
108 fLastLayerToTrackTo(kLastLayerToTrackTo)
109{
110 //--------------------------------------------------------------------
111 //This is the AliITStrackerV2 constructor
112 //--------------------------------------------------------------------
113 if (geom) {
114 AliWarning("\"geom\" is actually a dummy argument !");
115 }
116
117 for (Int_t i=1; i<kMaxLayer+1; i++) {
118 Int_t nlad=AliITSgeomTGeo::GetNLadders(i);
119 Int_t ndet=AliITSgeomTGeo::GetNDetectors(i);
120
121 Double_t xyz[3], &x=xyz[0], &y=xyz[1], &z=xyz[2];
122 AliITSgeomTGeo::GetOrigTranslation(i,1,1,xyz);
123 Double_t poff=TMath::ATan2(y,x);
124 Double_t zoff=z;
125 Double_t r=TMath::Sqrt(x*x + y*y);
126
127 AliITSgeomTGeo::GetOrigTranslation(i,1,2,xyz);
128 r += TMath::Sqrt(x*x + y*y);
129 AliITSgeomTGeo::GetOrigTranslation(i,2,1,xyz);
130 r += TMath::Sqrt(x*x + y*y);
131 AliITSgeomTGeo::GetOrigTranslation(i,2,2,xyz);
132 r += TMath::Sqrt(x*x + y*y);
133 r*=0.25;
134
135 new (fgLayers+i-1) AliITSlayer(r,poff,zoff,nlad,ndet);
136
137 for (Int_t j=1; j<nlad+1; j++) {
138 for (Int_t k=1; k<ndet+1; k++) { //Fill this layer with detectors
139 TGeoHMatrix m; AliITSgeomTGeo::GetOrigMatrix(i,j,k,m);
140 const TGeoHMatrix *tm=AliITSgeomTGeo::GetTracking2LocalMatrix(i,j,k);
141 m.Multiply(tm);
142 Double_t txyz[3]={0.}, xyz[3]={0.};
143 m.LocalToMaster(txyz,xyz);
144 Double_t r=TMath::Sqrt(xyz[0]*xyz[0] + xyz[1]*xyz[1]);
145 Double_t phi=TMath::ATan2(xyz[1],xyz[0]);
146
147 if (phi<0) phi+=TMath::TwoPi();
148 else if (phi>=TMath::TwoPi()) phi-=TMath::TwoPi();
149
150 AliITSdetector &det=fgLayers[i-1].GetDetector((j-1)*ndet + k-1);
151 new(&det) AliITSdetector(r,phi);
152 }
153 }
154
155 }
156
157 fConstraint[0]=1; fConstraint[1]=0;
158
159 Double_t xyz[]={AliITSReconstructor::GetRecoParam()->GetXVdef(),
160 AliITSReconstructor::GetRecoParam()->GetYVdef(),
161 AliITSReconstructor::GetRecoParam()->GetZVdef()};
162 Double_t ers[]={AliITSReconstructor::GetRecoParam()->GetSigmaXVdef(),
163 AliITSReconstructor::GetRecoParam()->GetSigmaYVdef(),
164 AliITSReconstructor::GetRecoParam()->GetSigmaZVdef()};
165 SetVertex(xyz,ers);
166
167 for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=kLayersNotToSkip[i];
168
169}
170
171void AliITStrackerV2::SetLayersNotToSkip(Int_t *l) {
172 //--------------------------------------------------------------------
173 //This function set masks of the layers which must be not skipped
174 //--------------------------------------------------------------------
175 for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=l[i];
176}
177
178Int_t AliITStrackerV2::LoadClusters(TTree *cTree) {
179 //--------------------------------------------------------------------
180 //This function loads ITS clusters
181 //--------------------------------------------------------------------
182 TBranch *branch=cTree->GetBranch("ITSRecPoints");
183 if (!branch) {
184 Error("LoadClusters"," can't get the branch !\n");
185 return 1;
186 }
187
188 TClonesArray dummy("AliITSRecPoint",10000), *clusters=&dummy;
189 branch->SetAddress(&clusters);
190
191 Int_t j=0;
192 for (Int_t i=0; i<kMaxLayer; i++) {
193 Int_t ndet=fgLayers[i].GetNdetectors();
194 Int_t jmax = j + fgLayers[i].GetNladders()*ndet;
195
196 Double_t r=fgLayers[i].GetR();
197 Double_t circ=TMath::TwoPi()*r;
198
199 for (; j<jmax; j++) {
200 if (!cTree->GetEvent(j)) continue;
201 Int_t ncl=clusters->GetEntriesFast();
202
203 while (ncl--) {
204 AliITSRecPoint *c=(AliITSRecPoint*)clusters->UncheckedAt(ncl);
205
206 if (!c->Misalign()) AliWarning("Can't misalign this cluster !");
207
208 Int_t idx=c->GetDetectorIndex();
209 AliITSdetector &det=fgLayers[i].GetDetector(idx);
210
211 Double_t y=r*det.GetPhi()+c->GetY();
212 if (y>circ) y-=circ; else if (y<0) y+=circ;
213 c->SetPhiR(y);
214
215 fgLayers[i].InsertCluster(new AliITSRecPoint(*c));
216 }
217 clusters->Delete();
218 }
219 fgLayers[i].ResetRoad(); //road defined by the cluster density
220 }
221
222 return 0;
223}
224
225void AliITStrackerV2::UnloadClusters() {
226 //--------------------------------------------------------------------
227 //This function unloads ITS clusters
228 //--------------------------------------------------------------------
229 for (Int_t i=0; i<kMaxLayer; i++) fgLayers[i].ResetClusters();
230}
231
232static Int_t CorrectForDeadZoneMaterial(AliITStrackV2 *t) {
233 //--------------------------------------------------------------------
234 // Correction for the material between the TPC and the ITS
235 // (should it belong to the TPC code ?)
236 //--------------------------------------------------------------------
237 Double_t riw=80., diw=0.0053, x0iw=30; // TPC inner wall ?
238 Double_t rcd=61., dcd=0.0053, x0cd=30; // TPC "central drum" ?
239 Double_t yr=12.8, dr=0.03; // rods ?
240 Double_t zm=0.2, dm=0.40; // membrane
241 //Double_t rr=52., dr=0.19, x0r=24., yyr=7.77; //rails
242 Double_t rs=50., ds=0.001; // something belonging to the ITS (screen ?)
243
244 if (t->GetX() > riw) {
245 if (!t->PropagateTo(riw,diw,x0iw)) return 1;
246 if (TMath::Abs(t->GetY())>yr) t->CorrectForMaterial(dr);
247 if (TMath::Abs(t->GetZ())<zm) t->CorrectForMaterial(dm);
248 if (!t->PropagateTo(rcd,dcd,x0cd)) return 1;
249 //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z);
250 //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,dr,x0r);
251 if (!t->PropagateTo(rs,ds)) return 1;
252 } else if (t->GetX() < rs) {
253 if (!t->PropagateTo(rs,-ds)) return 1;
254 //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z);
255 //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,-dr,x0r);
256 if (!t->PropagateTo(rcd,-dcd,x0cd)) return 1;
257 if (!t->PropagateTo(riw+0.001,-diw,x0iw)) return 1;
258 } else {
259 ::Error("CorrectForDeadZoneMaterial","track is already in the dead zone !");
260 return 1;
261 }
262
263 return 0;
264}
265
266Int_t AliITStrackerV2::Clusters2Tracks(AliESDEvent *event) {
267 //--------------------------------------------------------------------
268 // This functions reconstructs ITS tracks
269 // The clusters must be already loaded !
270 //--------------------------------------------------------------------
271 TObjArray itsTracks(15000);
272
273 {/* Read ESD tracks */
274 Int_t nentr=event->GetNumberOfTracks();
275 Info("Clusters2Tracks", "Number of ESD tracks: %d\n", nentr);
276 while (nentr--) {
277 AliESDtrack *esd=event->GetTrack(nentr);
278
279 if ((esd->GetStatus()&AliESDtrack::kTPCin)==0) continue;
280 if (esd->GetStatus()&AliESDtrack::kTPCout) continue;
281 if (esd->GetStatus()&AliESDtrack::kITSin) continue;
282
283 AliITStrackV2 *t=0;
284 try {
285 t=new AliITStrackV2(*esd);
286 } catch (const Char_t *msg) {
287 Warning("Clusters2Tracks",msg);
288 delete t;
289 continue;
290 }
291 if (TMath::Abs(t->GetD(GetX(),GetY()))>4) {
292 delete t;
293 continue;
294 }
295
296 if (CorrectForDeadZoneMaterial(t)!=0) {
297 Warning("Clusters2Tracks",
298 "failed to correct for the material in the dead zone !\n");
299 delete t;
300 continue;
301 }
302 itsTracks.AddLast(t);
303 }
304 } /* End Read ESD tracks */
305
306 itsTracks.Sort();
307 Int_t nentr=itsTracks.GetEntriesFast();
308
309 Int_t ntrk=0;
310 for (fPass=0; fPass<2; fPass++) {
311 Int_t &constraint=fConstraint[fPass]; if (constraint<0) continue;
312 for (Int_t i=0; i<nentr; i++) {
313 AliITStrackV2 *t=(AliITStrackV2*)itsTracks.UncheckedAt(i);
314 if (t==0) continue; //this track has been already tracked
315 Int_t tpcLabel=t->GetLabel(); //save the TPC track label
316
317 ResetTrackToFollow(*t);
318 ResetBestTrack();
319
320 for (FollowProlongation(); fI<kMaxLayer; fI++) {
321 while (TakeNextProlongation()) FollowProlongation();
322 }
323
324 if (fBestTrack.GetNumberOfClusters() == 0) continue;
325
326 if (fConstraint[fPass]) {
327 ResetTrackToFollow(*t);
328 if (!RefitAt(3.7, &fTrackToFollow, &fBestTrack)) continue;
329 ResetBestTrack();
330 }
331
332 fBestTrack.SetLabel(tpcLabel);
333 fBestTrack.CookdEdx();
334 CookLabel(&fBestTrack,0.); //For comparison only
335 fBestTrack.UpdateESDtrack(AliESDtrack::kITSin);
336 UseClusters(&fBestTrack);
337 delete itsTracks.RemoveAt(i);
338 ntrk++;
339 }
340 }
341
342 itsTracks.Delete();
343
344 Info("Clusters2Tracks","Number of prolonged tracks: %d\n",ntrk);
345
346 return 0;
347}
348
349Int_t AliITStrackerV2::PropagateBack(AliESDEvent *event) {
350 //--------------------------------------------------------------------
351 // This functions propagates reconstructed ITS tracks back
352 // The clusters must be loaded !
353 //--------------------------------------------------------------------
354 Int_t nentr=event->GetNumberOfTracks();
355 Info("PropagateBack", "Number of ESD tracks: %d\n", nentr);
356
357 Int_t ntrk=0;
358 for (Int_t i=0; i<nentr; i++) {
359 AliESDtrack *esd=event->GetTrack(i);
360
361 if ((esd->GetStatus()&AliESDtrack::kITSin)==0) continue;
362 if (esd->GetStatus()&AliESDtrack::kITSout) continue;
363
364 AliITStrackV2 *t=0;
365 try {
366 t=new AliITStrackV2(*esd);
367 } catch (const Char_t *msg) {
368 Warning("PropagateBack",msg);
369 delete t;
370 continue;
371 }
372
373 ResetTrackToFollow(*t);
374
375 // propagete to vertex [SR, GSI 17.02.2003]
376 // Start Time measurement [SR, GSI 17.02.2003], corrected by I.Belikov
377 if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) {
378 if (fTrackToFollow.PropagateToVertex(event->GetVertex())) {
379 fTrackToFollow.StartTimeIntegral();
380 }
381 fTrackToFollow.PropagateTo(3.,-0.0028,65.19);
382 }
383
384 fTrackToFollow.ResetCovariance(10.); fTrackToFollow.ResetClusters();
385 if (RefitAt(49.,&fTrackToFollow,t)) {
386 if (CorrectForDeadZoneMaterial(&fTrackToFollow)!=0) {
387 Warning("PropagateBack",
388 "failed to correct for the material in the dead zone !\n");
389 delete t;
390 continue;
391 }
392 fTrackToFollow.SetLabel(t->GetLabel());
393 //fTrackToFollow.CookdEdx();
394 CookLabel(&fTrackToFollow,0.); //For comparison only
395 fTrackToFollow.UpdateESDtrack(AliESDtrack::kITSout);
396 UseClusters(&fTrackToFollow);
397 ntrk++;
398 }
399 delete t;
400 }
401
402 Info("PropagateBack","Number of back propagated ITS tracks: %d\n",ntrk);
403
404 return 0;
405}
406
407Int_t AliITStrackerV2::RefitInward(AliESDEvent *event) {
408 //--------------------------------------------------------------------
409 // This functions refits ITS tracks using the
410 // "inward propagated" TPC tracks
411 // The clusters must be loaded !
412 //--------------------------------------------------------------------
413 Int_t nentr=event->GetNumberOfTracks();
414 Info("RefitInward", "Number of ESD tracks: %d\n", nentr);
415
416 Int_t ntrk=0;
417 for (Int_t i=0; i<nentr; i++) {
418 AliESDtrack *esd=event->GetTrack(i);
419
420 if ((esd->GetStatus()&AliESDtrack::kITSout) == 0) continue;
421 if (esd->GetStatus()&AliESDtrack::kITSrefit) continue;
422 if (esd->GetStatus()&AliESDtrack::kTPCout)
423 if ((esd->GetStatus()&AliESDtrack::kTPCrefit)==0) continue;
424
425 AliITStrackV2 *t=0;
426 try {
427 t=new AliITStrackV2(*esd);
428 } catch (const Char_t *msg) {
429 Warning("RefitInward",msg);
430 delete t;
431 continue;
432 }
433
434 if (CorrectForDeadZoneMaterial(t)!=0) {
435 Warning("RefitInward",
436 "failed to correct for the material in the dead zone !\n");
437 delete t;
438 continue;
439 }
440
441 ResetTrackToFollow(*t);
442 fTrackToFollow.ResetClusters();
443
444 //Refitting...
445 if (RefitAt(3.7, &fTrackToFollow, t, kTRUE)) {
446 fTrackToFollow.SetLabel(t->GetLabel());
447 fTrackToFollow.CookdEdx();
448 CookLabel(&fTrackToFollow,0.); //For comparison only
449
450 if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) {//The beam pipe
451 AliESDtrack *esdTrack =fTrackToFollow.GetESDtrack();
452 esdTrack->UpdateTrackParams(&fTrackToFollow,AliESDtrack::kITSrefit);
453 Float_t r[3]={0.,0.,0.};
454 Double_t maxD=3.;
455 esdTrack->RelateToVertex(event->GetVertex(),GetBz(r),maxD);
456 ntrk++;
457 }
458 }
459 delete t;
460 }
461
462 Info("RefitInward","Number of refitted tracks: %d\n",ntrk);
463
464 return 0;
465}
466
467AliCluster *AliITStrackerV2::GetCluster(Int_t index) const {
468 //--------------------------------------------------------------------
469 // Return pointer to a given cluster
470 //--------------------------------------------------------------------
471 Int_t l=(index & 0xf0000000) >> 28;
472 Int_t c=(index & 0x0fffffff) >> 00;
473 return fgLayers[l].GetCluster(c);
474}
475
476
477void AliITStrackerV2::FollowProlongation() {
478 //--------------------------------------------------------------------
479 //This function finds a track prolongation
480 //--------------------------------------------------------------------
481 while (fI>fLastLayerToTrackTo) {
482 Int_t i=fI-1;
483
484 AliITSlayer &layer=fgLayers[i];
485 AliITStrackV2 &track=fTracks[i];
486
487 Double_t r=layer.GetR();
488
489 if (i==3 || i==1) {
490 Double_t rs=0.5*(fgLayers[i+1].GetR() + r);
491 Double_t d=0.0034, x0=38.6;
492 if (i==1) {rs=9.; d=0.0097; x0=42;}
493 if (!fTrackToFollow.PropagateTo(rs,d,x0)) {
494 //Warning("FollowProlongation","propagation failed !\n");
495 return;
496 }
497 }
498
499 //find intersection
500 Double_t phi,z;
501 if (!fTrackToFollow.GetPhiZat(r,phi,z)) {
502 //Warning("FollowProlongation","failed to estimate track !\n");
503 return;
504 }
505
506 Int_t idet=layer.FindDetectorIndex(phi,z);
507 if (idet<0) {
508 //Warning("FollowProlongation","failed to find a detector !\n");
509 return;
510 }
511
512 //propagate to the intersection
513 const AliITSdetector &det=layer.GetDetector(idet);
514 phi=det.GetPhi();
515 if (!fTrackToFollow.Propagate(phi,det.GetR())) {
516 //Warning("FollowProlongation","propagation failed !\n");
517 return;
518 }
519 fTrackToFollow.SetDetectorIndex(idet);
520
521 //Select possible prolongations and store the current track estimation
522 track.~AliITStrackV2(); new(&track) AliITStrackV2(fTrackToFollow);
523 Double_t dz=7*TMath::Sqrt(track.GetSigmaZ2() + AliITSReconstructor::GetRecoParam()->GetSigmaZ2(i));
524 Double_t dy=7*TMath::Sqrt(track.GetSigmaY2() + AliITSReconstructor::GetRecoParam()->GetSigmaY2(i));
525 Double_t road=layer.GetRoad();
526 if (dz*dy>road*road) {
527 Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd;
528 dz=road*scz; dy=road*scy;
529 }
530
531 //Double_t dz=4*TMath::Sqrt(track.GetSigmaZ2() + AliITSReconstructor::GetRecoParam()->GetSigmaZ2(i));
532 if (dz < 0.5*TMath::Abs(track.GetTgl())) dz=0.5*TMath::Abs(track.GetTgl());
533 if (dz > AliITSReconstructor::GetRecoParam()->GetMaxRoad()) {
534 //Warning("FollowProlongation","too broad road in Z !\n");
535 return;
536 }
537
538 if (TMath::Abs(fTrackToFollow.GetZ()-GetZ()) > r+dz) return;
539
540 //Double_t dy=4*TMath::Sqrt(track.GetSigmaY2() + AliITSReconstructor::GetRecoParam()->GetSigmaY2(i));
541 if (dy < 0.5*TMath::Abs(track.GetSnp())) dy=0.5*TMath::Abs(track.GetSnp());
542 if (dy > AliITSReconstructor::GetRecoParam()->GetMaxRoad()) {
543 //Warning("FollowProlongation","too broad road in Y !\n");
544 return;
545 }
546
547 fI--;
548
549 Double_t zmin=track.GetZ() - dz;
550 Double_t zmax=track.GetZ() + dz;
551 Double_t ymin=track.GetY() + r*phi - dy;
552 Double_t ymax=track.GetY() + r*phi + dy;
553 if (layer.SelectClusters(zmin,zmax,ymin,ymax)==0)
554 if (fLayersNotToSkip[fI]) return;
555
556 if (!TakeNextProlongation())
557 if (fLayersNotToSkip[fI]) return;
558
559 }
560
561 //deal with the best track
562 Int_t ncl=fTrackToFollow.GetNumberOfClusters();
563 Int_t nclb=fBestTrack.GetNumberOfClusters();
564 if (ncl)
565 if (ncl >= nclb) {
566 Double_t chi2=fTrackToFollow.GetChi2();
567 if (chi2/ncl < AliITSReconstructor::GetRecoParam()->GetChi2PerCluster()) {
568 if (ncl > nclb || chi2 < fBestTrack.GetChi2()) {
569 ResetBestTrack();
570 }
571 }
572 }
573
574}
575
576Int_t AliITStrackerV2::TakeNextProlongation() {
577 //--------------------------------------------------------------------
578 // This function takes another track prolongation
579 //
580 // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch
581 //--------------------------------------------------------------------
582 AliITSlayer &layer=fgLayers[fI];
583 ResetTrackToFollow(fTracks[fI]);
584
585 Double_t dz=7*TMath::Sqrt(fTrackToFollow.GetSigmaZ2() + AliITSReconstructor::GetRecoParam()->GetSigmaZ2(fI));
586 Double_t dy=7*TMath::Sqrt(fTrackToFollow.GetSigmaY2() + AliITSReconstructor::GetRecoParam()->GetSigmaY2(fI));
587 Double_t road=layer.GetRoad();
588 if (dz*dy>road*road) {
589 Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd;
590 dz=road*scz; dy=road*scy;
591 }
592
593 const AliITSRecPoint *c=0; Int_t ci=-1;
594 const AliITSRecPoint *cc=0; Int_t cci=-1;
595 Double_t chi2=AliITSReconstructor::GetRecoParam()->GetMaxChi2();
596 while ((c=layer.GetNextCluster(ci))!=0) {
597 Int_t idet=c->GetDetectorIndex();
598
599 if (fTrackToFollow.GetDetectorIndex()!=idet) {
600 const AliITSdetector &det=layer.GetDetector(idet);
601 ResetTrackToFollow(fTracks[fI]);
602 if (!fTrackToFollow.Propagate(det.GetPhi(),det.GetR())) {
603 //Warning("TakeNextProlongation","propagation failed !\n");
604 continue;
605 }
606 fTrackToFollow.SetDetectorIndex(idet);
607 if (TMath::Abs(fTrackToFollow.GetZ()-GetZ())>layer.GetR()+dz) continue;
608 }
609
610 if (TMath::Abs(fTrackToFollow.GetZ() - c->GetZ()) > dz) continue;
611 if (TMath::Abs(fTrackToFollow.GetY() - c->GetY()) > dy) continue;
612
613 Double_t ch2=fTrackToFollow.GetPredictedChi2(c);
614 if (ch2 > chi2) continue;
615 chi2=ch2;
616 cc=c; cci=ci;
617 break;
618 }
619
620 if (!cc) return 0;
621
622 {// Take into account the mis-alignment
623 Double_t x = fTrackToFollow.GetX() + cc->GetX();
624 if (!fTrackToFollow.PropagateTo(x,0.,0.)) return 0;
625 }
626 if (!fTrackToFollow.Update(cc,chi2,(fI<<28)+cci)) {
627 //Warning("TakeNextProlongation","filtering failed !\n");
628 return 0;
629 }
630
631 if (fTrackToFollow.GetNumberOfClusters()>1)
632 if (TMath::Abs(fTrackToFollow.GetD(GetX(),GetY()))>4) return 0;
633
634 fTrackToFollow.
635 SetSampledEdx(cc->GetQ(),fTrackToFollow.GetNumberOfClusters()-1); //b.b.
636
637 {
638 Double_t x0;
639 Double_t d=layer.GetThickness(fTrackToFollow.GetY(),fTrackToFollow.GetZ(),x0);
640 fTrackToFollow.CorrectForMaterial(d,x0);
641 }
642
643 if (fConstraint[fPass]) {
644 Double_t d=GetEffectiveThickness(0,0); //Think of this !!!!
645 Double_t xyz[]={GetX(),GetY(),GetZ()};
646 Double_t ers[]={GetSigmaX(),GetSigmaY(),GetSigmaZ()};
647 fTrackToFollow.Improve(d,xyz,ers);
648 }
649
650 return 1;
651}
652
653
654AliITStrackerV2::AliITSlayer::AliITSlayer():
655 fR(0.),
656 fPhiOffset(0.),
657 fNladders(0),
658 fZOffset(0.),
659 fNdetectors(0),
660 fDetectors(0),
661 fNsel(0),
662 fRoad(2*fR*TMath::Sqrt(3.14/1.)) //assuming that there's only one cluster
663{
664 //--------------------------------------------------------------------
665 //default AliITSlayer constructor
666 //--------------------------------------------------------------------
667
668 for (Int_t i=0; i<kNsector; i++) fN[i]=0;
669
670}
671
672AliITStrackerV2::AliITSlayer::
673AliITSlayer(Double_t r,Double_t p,Double_t z,Int_t nl,Int_t nd):
674 fR(r),
675 fPhiOffset(p),
676 fNladders(nl),
677 fZOffset(z),
678 fNdetectors(nd),
679 fDetectors(new AliITSdetector[nl*nd]),
680 fNsel(0),
681 fRoad(2*r*TMath::Sqrt(3.14/1.)) //assuming that there's only one cluster
682{
683 //--------------------------------------------------------------------
684 //main AliITSlayer constructor
685 //--------------------------------------------------------------------
686
687 for (Int_t i=0; i<kNsector; i++) fN[i]=0;
688
689 for (Int_t i=0; i<kMaxClusterPerLayer; i++) fClusters[i]=0;
690
691}
692
693AliITStrackerV2::AliITSlayer::~AliITSlayer() {
694 //--------------------------------------------------------------------
695 // AliITSlayer destructor
696 //--------------------------------------------------------------------
697 delete[] fDetectors;
698 ResetClusters();
699}
700
701void AliITStrackerV2::AliITSlayer::ResetClusters() {
702 //--------------------------------------------------------------------
703 // This function removes loaded clusters
704 //--------------------------------------------------------------------
705 for (Int_t s=0; s<kNsector; s++) {
706 Int_t &n=fN[s];
707 while (n) {
708 n--;
709 delete fClusters[s*kMaxClusterPerSector+n];
710 }
711 }
712}
713
714void AliITStrackerV2::AliITSlayer::ResetRoad() {
715 //--------------------------------------------------------------------
716 // This function calculates the road defined by the cluster density
717 //--------------------------------------------------------------------
718 Int_t n=0;
719 for (Int_t s=0; s<kNsector; s++) {
720 Int_t i=fN[s];
721 while (i--)
722 if (TMath::Abs(fClusters[s*kMaxClusterPerSector+i]->GetZ())<fR) n++;
723 }
724 if (n>1) fRoad=2*fR*TMath::Sqrt(3.14/n);
725}
726
727Int_t AliITStrackerV2::AliITSlayer::InsertCluster(AliITSRecPoint *c) {
728 //--------------------------------------------------------------------
729 // This function inserts a cluster to this layer in increasing
730 // order of the cluster's fZ
731 //--------------------------------------------------------------------
732 Float_t circ=TMath::TwoPi()*fR;
733 Int_t sec=Int_t(kNsector*c->GetPhiR()/circ);
734 if (sec>=kNsector) {
735 ::Error("InsertCluster","Wrong sector !\n");
736 return 1;
737 }
738 Int_t &n=fN[sec];
739 if (n>=kMaxClusterPerSector) {
740 ::Error("InsertCluster","Too many clusters !\n");
741 return 1;
742 }
743 if (n==0) fClusters[sec*kMaxClusterPerSector]=c;
744 else {
745 Int_t i=FindClusterIndex(c->GetZ(),sec);
746 Int_t k=n-i+sec*kMaxClusterPerSector;
747 memmove(fClusters+i+1 ,fClusters+i,k*sizeof(AliITSRecPoint*));
748 fClusters[i]=c;
749 }
750 n++;
751 return 0;
752}
753
754Int_t
755AliITStrackerV2::AliITSlayer::FindClusterIndex(Float_t z,Int_t s) const {
756 //--------------------------------------------------------------------
757 // For the sector "s", this function returns the index of the first
758 // with its fZ >= "z".
759 //--------------------------------------------------------------------
760 Int_t nc=fN[s];
761 if (nc==0) return kMaxClusterPerSector*s;
762
763 Int_t b=kMaxClusterPerSector*s;
764 if (z <= fClusters[b]->GetZ()) return b;
765
766 Int_t e=b+nc-1;
767 if (z > fClusters[e]->GetZ()) return e+1;
768
769 Int_t m=(b+e)/2;
770 for (; b<e; m=(b+e)/2) {
771 if (z > fClusters[m]->GetZ()) b=m+1;
772 else e=m;
773 }
774 return m;
775}
776
777Int_t AliITStrackerV2::AliITSlayer::
778SelectClusters(Float_t zmin,Float_t zmax,Float_t ymin, Float_t ymax) {
779 //--------------------------------------------------------------------
780 // This function selects clusters within the "window"
781 //--------------------------------------------------------------------
782 Float_t circ=fR*TMath::TwoPi();
783
784 if (ymin>circ) ymin-=circ; else if (ymin<0) ymin+=circ;
785 if (ymax>circ) ymax-=circ; else if (ymax<0) ymax+=circ;
786
787 Int_t i1=Int_t(kNsector*ymin/circ); if (i1==kNsector) i1--;
788 if (fN[i1]!=0) {
789 Float_t ym = (ymax<ymin) ? ymax+circ : ymax;
790 Int_t i=FindClusterIndex(zmin,i1), imax=i1*kMaxClusterPerSector+fN[i1];
791 for (; i<imax; i++) {
792 AliITSRecPoint *c=fClusters[i];
793 if (c->IsUsed()) continue;
794 if (c->GetZ()>zmax) break;
795 if (c->GetPhiR()<=ymin) continue;
796 if (c->GetPhiR()>ym) continue;
797 fIndex[fNsel++]=i;
798 }
799 }
800
801 Int_t i2=Int_t(kNsector*ymax/circ); if (i2==kNsector) i2--;
802 if (i2==i1) return fNsel;
803
804 if (fN[i2]!=0) {
805 Float_t ym = (ymin>ymax) ? ymin-circ : ymin;
806 Int_t i=FindClusterIndex(zmin,i2), imax=i2*kMaxClusterPerSector+fN[i2];
807 for (; i<imax; i++) {
808 AliITSRecPoint *c=fClusters[i];
809 if (c->IsUsed()) continue;
810 if (c->GetZ()>zmax) break;
811 if (c->GetPhiR()<=ym) continue;
812 if (c->GetPhiR()>ymax) continue;
813 fIndex[fNsel++]=i;
814 }
815 }
816
817 return fNsel;
818}
819
820const AliITSRecPoint *AliITStrackerV2::AliITSlayer::GetNextCluster(Int_t &ci){
821 //--------------------------------------------------------------------
822 // This function returns clusters within the "window"
823 //--------------------------------------------------------------------
824 AliITSRecPoint *c=0;
825 ci=-1;
826 if (fNsel) {
827 fNsel--;
828 ci=fIndex[fNsel];
829 c=fClusters[ci];
830 }
831 return c;
832}
833
834Int_t AliITStrackerV2::AliITSlayer::GetNumberOfClusters() const {
835 Int_t n=0;
836 for (Int_t s=0; s<kNsector; s++) n+=fN[s];
837 return n;
838}
839
840Int_t
841AliITStrackerV2::AliITSlayer::FindDetectorIndex(Double_t phi,Double_t z)const {
842 //--------------------------------------------------------------------
843 //This function finds the detector crossed by the track
844 //--------------------------------------------------------------------
845 Double_t dphi;
846 if (fZOffset<0) // old geometry
847 dphi = -(phi-fPhiOffset);
848 else // new geometry
849 dphi = phi-fPhiOffset;
850
851 if (dphi < 0) dphi += 2*TMath::Pi();
852 else if (dphi >= 2*TMath::Pi()) dphi -= 2*TMath::Pi();
853 Int_t np=Int_t(dphi*fNladders*0.5/TMath::Pi()+0.5);
854 if (np>=fNladders) np-=fNladders;
855 if (np<0) np+=fNladders;
856
857 Double_t dz=fZOffset-z;
858 Int_t nz=Int_t(dz*(fNdetectors-1)*0.5/fZOffset+0.5);
859 if (nz>=fNdetectors) return -1;
860 if (nz<0) return -1;
861
862 return np*fNdetectors + nz;
863}
864
865Double_t
866AliITStrackerV2::AliITSlayer::GetThickness(Double_t y,Double_t z,Double_t &x0)
867const {
868 //--------------------------------------------------------------------
869 //This function returns the layer thickness at this point (units X0)
870 //--------------------------------------------------------------------
871 Double_t d=0.0085;
872 x0=21.82;
873
874 if (43<fR&&fR<45) { //SSD2
875 Double_t dd=0.0034;
876 d=dd;
877 if (TMath::Abs(y-0.00)>3.40) d+=dd;
878 if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);}
879 if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);}
880 for (Int_t i=0; i<12; i++) {
881 if (TMath::Abs(z-3.9*(i+0.5))<0.15) {
882 if (TMath::Abs(y-0.00)>3.40) d+=dd;
883 d+=0.0034;
884 break;
885 }
886 if (TMath::Abs(z+3.9*(i+0.5))<0.15) {
887 if (TMath::Abs(y-0.00)>3.40) d+=dd;
888 d+=0.0034;
889 break;
890 }
891 if (TMath::Abs(z-3.4-3.9*i)<0.50) {d+=(0.016-0.0034); break;}
892 if (TMath::Abs(z+0.5+3.9*i)<0.50) {d+=(0.016-0.0034); break;}
893 }
894 } else
895 if (37<fR&&fR<41) { //SSD1
896 Double_t dd=0.0034;
897 d=dd;
898 if (TMath::Abs(y-0.00)>3.40) d+=dd;
899 if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);}
900 if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);}
901 for (Int_t i=0; i<11; i++) {
902 if (TMath::Abs(z-3.9*i)<0.15) {
903 if (TMath::Abs(y-0.00)>3.40) d+=dd;
904 d+=dd;
905 break;
906 }
907 if (TMath::Abs(z+3.9*i)<0.15) {
908 if (TMath::Abs(y-0.00)>3.40) d+=dd;
909 d+=dd;
910 break;
911 }
912 if (TMath::Abs(z-1.85-3.9*i)<0.50) {d+=(0.016-0.0034); break;}
913 if (TMath::Abs(z+2.05+3.9*i)<0.50) {d+=(0.016-0.0034); break;}
914 }
915 } else
916 if (13<fR&&fR<26) { //SDD
917 Double_t dd=0.0033;
918 d=dd;
919 if (TMath::Abs(y-0.00)>3.30) d+=dd;
920
921 if (TMath::Abs(y-1.80)<0.55) {
922 d+=0.016;
923 for (Int_t j=0; j<20; j++) {
924 if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;}
925 if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;}
926 }
927 }
928 if (TMath::Abs(y+1.80)<0.55) {
929 d+=0.016;
930 for (Int_t j=0; j<20; j++) {
931 if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;}
932 if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;}
933 }
934 }
935
936 for (Int_t i=0; i<4; i++) {
937 if (TMath::Abs(z-7.3*i)<0.60) {
938 d+=dd;
939 if (TMath::Abs(y-0.00)>3.30) d+=dd;
940 break;
941 }
942 if (TMath::Abs(z+7.3*i)<0.60) {
943 d+=dd;
944 if (TMath::Abs(y-0.00)>3.30) d+=dd;
945 break;
946 }
947 }
948 } else
949 if (6<fR&&fR<8) { //SPD2
950 Double_t dd=0.0063; x0=21.5;
951 d=dd;
952 if (TMath::Abs(y-3.08)>0.5) d+=dd;
953 //if (TMath::Abs(y-3.08)>0.45) d+=dd;
954 if (TMath::Abs(y-3.03)<0.10) {d+=0.014;}
955 } else
956 if (3<fR&&fR<5) { //SPD1
957 Double_t dd=0.0063; x0=21.5;
958 d=dd;
959 if (TMath::Abs(y+0.21)>0.6) d+=dd;
960 //if (TMath::Abs(y+0.21)>0.45) d+=dd;
961 if (TMath::Abs(y+0.10)<0.10) {d+=0.014;}
962 }
963
964 return d;
965}
966
967Double_t AliITStrackerV2::GetEffectiveThickness(Double_t y,Double_t z) const
968{
969 //--------------------------------------------------------------------
970 //Returns the thickness between the current layer and the vertex (units X0)
971 //--------------------------------------------------------------------
972 Double_t d=0.0028*3*3; //beam pipe
973 Double_t x0=0;
974
975 Double_t xn=fgLayers[fI].GetR();
976 for (Int_t i=0; i<fI; i++) {
977 Double_t xi=fgLayers[i].GetR();
978 d+=fgLayers[i].GetThickness(y,z,x0)*xi*xi;
979 }
980
981 if (fI>1) {
982 Double_t xi=9.;
983 d+=0.0097*xi*xi;
984 }
985
986 if (fI>3) {
987 Double_t xi=0.5*(fgLayers[3].GetR()+fgLayers[4].GetR());
988 d+=0.0034*xi*xi;
989 }
990
991 return d/(xn*xn);
992}
993
994Bool_t AliITStrackerV2::RefitAt(Double_t xx,AliITStrackV2 *t,
995 const AliITStrackV2 *c, Bool_t extra) {
996 //--------------------------------------------------------------------
997 // This function refits the track "t" at the position "x" using
998 // the clusters from "c"
999 // If "extra"==kTRUE,
1000 // the clusters from overlapped modules get attached to "t"
1001 //--------------------------------------------------------------------
1002 Int_t index[kMaxLayer];
1003 Int_t k;
1004 for (k=0; k<kMaxLayer; k++) index[k]=-1;
1005 Int_t nc=c->GetNumberOfClusters();
1006 for (k=0; k<nc; k++) {
1007 Int_t idx=c->GetClusterIndex(k),nl=(idx&0xf0000000)>>28;
1008 index[nl]=idx;
1009 }
1010
1011 Int_t from, to, step;
1012 if (xx > t->GetX()) {
1013 from=0; to=kMaxLayer;
1014 step=+1;
1015 } else {
1016 from=kMaxLayer-1; to=-1;
1017 step=-1;
1018 }
1019
1020 for (Int_t i=from; i != to; i += step) {
1021 AliITSlayer &layer=fgLayers[i];
1022 Double_t r=layer.GetR();
1023
1024 {
1025 Double_t hI=i-0.5*step;
1026 if (TMath::Abs(hI-1.5)<0.01 || TMath::Abs(hI-3.5)<0.01) {
1027 Double_t rs=0.5*(fgLayers[i-step].GetR() + r);
1028 Double_t d=0.0034, x0=38.6;
1029 if (TMath::Abs(hI-1.5)<0.01) {rs=9.; d=0.0097; x0=42;}
1030 if (!t->PropagateTo(rs,-step*d,x0)) {
1031 return kFALSE;
1032 }
1033 }
1034 }
1035
1036 // remember old position [SR, GSI 18.02.2003]
1037 Double_t oldX=0., oldY=0., oldZ=0.;
1038 if (t->IsStartedTimeIntegral() && step==1) {
1039 t->GetGlobalXYZat(t->GetX(),oldX,oldY,oldZ);
1040 }
1041 //
1042
1043 Double_t phi,z;
1044 if (!t->GetPhiZat(r,phi,z)) {
1045 return kFALSE;
1046 }
1047
1048 Int_t idet=layer.FindDetectorIndex(phi,z);
1049 if (idet<0) {
1050 return kFALSE;
1051 }
1052 const AliITSdetector &det=layer.GetDetector(idet);
1053 phi=det.GetPhi();
1054 if (!t->Propagate(phi,det.GetR())) {
1055 return kFALSE;
1056 }
1057 t->SetDetectorIndex(idet);
1058
1059 const AliITSRecPoint *cl=0;
1060 Double_t maxchi2=AliITSReconstructor::GetRecoParam()->GetMaxChi2();
1061
1062 Int_t idx=index[i];
1063 if (idx>=0) {
1064 const AliITSRecPoint *c=(AliITSRecPoint *)GetCluster(idx);
1065 if (idet != c->GetDetectorIndex()) {
1066 idet=c->GetDetectorIndex();
1067 const AliITSdetector &det=layer.GetDetector(idet);
1068 if (!t->Propagate(det.GetPhi(),det.GetR())) {
1069 return kFALSE;
1070 }
1071 t->SetDetectorIndex(idet);
1072 }
1073 Double_t chi2=t->GetPredictedChi2(c);
1074 if (chi2<maxchi2) {
1075 cl=c;
1076 maxchi2=chi2;
1077 } else {
1078 return kFALSE;
1079 }
1080 }
1081
1082 if (cl) {
1083 // Take into account the mis-alignment
1084 Double_t x=t->GetX()+cl->GetX();
1085 if (!t->PropagateTo(x,0.,0.)) return kFALSE;
1086 if (!t->Update(cl,maxchi2,idx)) {
1087 return kFALSE;
1088 }
1089 t->SetSampledEdx(cl->GetQ(),t->GetNumberOfClusters()-1);
1090 }
1091
1092 {
1093 Double_t x0;
1094 Double_t d=layer.GetThickness(t->GetY(),t->GetZ(),x0);
1095 t->CorrectForMaterial(-step*d,x0);
1096 }
1097
1098 if (extra) { //search for extra clusters
1099 AliITStrackV2 tmp(*t);
1100 Double_t dz=4*TMath::Sqrt(tmp.GetSigmaZ2()+AliITSReconstructor::GetRecoParam()->GetSigmaZ2(i));
1101 if (dz < 0.5*TMath::Abs(tmp.GetTgl())) dz=0.5*TMath::Abs(tmp.GetTgl());
1102 Double_t dy=4*TMath::Sqrt(t->GetSigmaY2()+AliITSReconstructor::GetRecoParam()->GetSigmaY2(i));
1103 if (dy < 0.5*TMath::Abs(tmp.GetSnp())) dy=0.5*TMath::Abs(tmp.GetSnp());
1104 Double_t zmin=t->GetZ() - dz;
1105 Double_t zmax=t->GetZ() + dz;
1106 Double_t ymin=t->GetY() + phi*r - dy;
1107 Double_t ymax=t->GetY() + phi*r + dy;
1108 layer.SelectClusters(zmin,zmax,ymin,ymax);
1109
1110 const AliITSRecPoint *c=0; Int_t ci=-1,cci=-1;
1111 Double_t maxchi2=1000.*AliITSReconstructor::GetRecoParam()->GetMaxChi2(), tolerance=0.1;
1112 while ((c=layer.GetNextCluster(ci))!=0) {
1113 if (idet == c->GetDetectorIndex()) continue;
1114
1115 const AliITSdetector &det=layer.GetDetector(c->GetDetectorIndex());
1116
1117 if (!tmp.Propagate(det.GetPhi(),det.GetR())) continue;
1118
1119 if (TMath::Abs(tmp.GetZ() - c->GetZ()) > tolerance) continue;
1120 if (TMath::Abs(tmp.GetY() - c->GetY()) > tolerance) continue;
1121
1122 Double_t chi2=tmp.GetPredictedChi2(c);
1123 if (chi2<maxchi2) { maxchi2=chi2; cci=ci; }
1124 }
1125 if (cci>=0) t->SetExtraCluster(i,(i<<28)+cci);
1126 }
1127
1128 // track time update [SR, GSI 17.02.2003]
1129 if (t->IsStartedTimeIntegral() && step==1) {
1130 Double_t newX, newY, newZ;
1131 t->GetGlobalXYZat(t->GetX(),newX,newY,newZ);
1132 Double_t dL2 = (oldX-newX)*(oldX-newX) + (oldY-newY)*(oldY-newY) +
1133 (oldZ-newZ)*(oldZ-newZ);
1134 t->AddTimeStep(TMath::Sqrt(dL2));
1135 }
1136 //
1137
1138 }
1139
1140 if (!t->PropagateTo(xx,0.,0.)) return kFALSE;
1141 return kTRUE;
1142}
1143
1144void AliITStrackerV2::UseClusters(const AliKalmanTrack *t, Int_t from) const {
1145 //--------------------------------------------------------------------
1146 // This function marks clusters assigned to the track
1147 //--------------------------------------------------------------------
1148 AliTracker::UseClusters(t,from);
1149
1150 Int_t clusterIndex = t->GetClusterIndex(0);
1151 AliITSRecPoint *c= 0x0;
1152
1153 if (clusterIndex>-1)
1154 c = (AliITSRecPoint *)GetCluster(clusterIndex);
1155 if (c && c->GetSigmaZ2()>0.1) c->UnUse();
1156
1157 c = 0x0;
1158 clusterIndex = t->GetClusterIndex(1);
1159 if (clusterIndex>-1)
1160 c=(AliITSRecPoint *)GetCluster(clusterIndex);
1161 if (c && c->GetSigmaZ2()>0.1) c->UnUse();
1162
1163}