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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 AliITSclusterV2 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 <TFile.h> | |
25 | #include <TTree.h> | |
26 | #include <TRandom.h> | |
27 | ||
28 | #include "AliITSgeom.h" | |
29 | #include "AliITSRecPoint.h" | |
30 | #include "AliTPCtrack.h" | |
31 | #include "AliESD.h" | |
32 | #include "AliITSclusterV2.h" | |
33 | #include "AliITStrackerV2.h" | |
34 | ||
35 | ClassImp(AliITStrackerV2) | |
36 | ||
37 | AliITStrackerV2::AliITSlayer AliITStrackerV2::fgLayers[kMaxLayer]; // ITS layers | |
38 | ||
39 | AliITStrackerV2::AliITStrackerV2(const AliITSgeom *geom) : AliTracker() { | |
40 | //-------------------------------------------------------------------- | |
41 | //This is the AliITStrackerV2 constructor | |
42 | //-------------------------------------------------------------------- | |
43 | AliITSgeom *g=(AliITSgeom*)geom; | |
44 | ||
45 | Float_t x,y,z; | |
46 | Int_t i; | |
47 | for (i=1; i<kMaxLayer+1; i++) { | |
48 | Int_t nlad=g->GetNladders(i); | |
49 | Int_t ndet=g->GetNdetectors(i); | |
50 | ||
51 | g->GetTrans(i,1,1,x,y,z); | |
52 | Double_t r=TMath::Sqrt(x*x + y*y); | |
53 | Double_t poff=TMath::ATan2(y,x); | |
54 | Double_t zoff=z; | |
55 | ||
56 | g->GetTrans(i,1,2,x,y,z); | |
57 | r += TMath::Sqrt(x*x + y*y); | |
58 | g->GetTrans(i,2,1,x,y,z); | |
59 | r += TMath::Sqrt(x*x + y*y); | |
60 | g->GetTrans(i,2,2,x,y,z); | |
61 | r += TMath::Sqrt(x*x + y*y); | |
62 | r*=0.25; | |
63 | ||
64 | new (fgLayers+i-1) AliITSlayer(r,poff,zoff,nlad,ndet); | |
65 | ||
66 | for (Int_t j=1; j<nlad+1; j++) { | |
67 | for (Int_t k=1; k<ndet+1; k++) { //Fill this layer with detectors | |
68 | Float_t x,y,zshift; g->GetTrans(i,j,k,x,y,zshift); | |
69 | Double_t rot[9]; g->GetRotMatrix(i,j,k,rot); | |
70 | ||
71 | Double_t phi=TMath::ATan2(rot[1],rot[0])+TMath::Pi(); | |
72 | phi+=TMath::Pi()/2; | |
73 | if (i==1) phi+=TMath::Pi(); | |
74 | Double_t cp=TMath::Cos(phi), sp=TMath::Sin(phi); | |
75 | Double_t r=x*cp+y*sp; | |
76 | ||
77 | AliITSdetector &det=fgLayers[i-1].GetDetector((j-1)*ndet + k-1); | |
78 | new(&det) AliITSdetector(r,phi); | |
79 | } | |
80 | } | |
81 | ||
82 | } | |
83 | ||
84 | fI=kMaxLayer; | |
85 | ||
86 | fPass=0; | |
87 | fConstraint[0]=1; fConstraint[1]=0; | |
88 | ||
89 | Double_t xyz[]={kXV,kYV,kZV}, ers[]={kSigmaXV,kSigmaYV,kSigmaZV}; | |
90 | SetVertex(xyz,ers); | |
91 | ||
92 | for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=kLayersNotToSkip[i]; | |
93 | fLastLayerToTrackTo=kLastLayerToTrackTo; | |
94 | ||
95 | } | |
96 | ||
97 | void AliITStrackerV2::SetLayersNotToSkip(Int_t *l) { | |
98 | //-------------------------------------------------------------------- | |
99 | //This function set masks of the layers which must be not skipped | |
100 | //-------------------------------------------------------------------- | |
101 | for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=l[i]; | |
102 | } | |
103 | ||
104 | Int_t AliITStrackerV2::LoadClusters(TTree *cTree) { | |
105 | //-------------------------------------------------------------------- | |
106 | //This function loads ITS clusters | |
107 | //-------------------------------------------------------------------- | |
108 | TBranch *branch=cTree->GetBranch("Clusters"); | |
109 | if (!branch) { | |
110 | Error("LoadClusters"," can't get the branch !\n"); | |
111 | return 1; | |
112 | } | |
113 | ||
114 | TClonesArray dummy("AliITSclusterV2",10000), *clusters=&dummy; | |
115 | branch->SetAddress(&clusters); | |
116 | ||
117 | Int_t j=0; | |
118 | for (Int_t i=0; i<kMaxLayer; i++) { | |
119 | Int_t ndet=fgLayers[i].GetNdetectors(); | |
120 | Int_t jmax = j + fgLayers[i].GetNladders()*ndet; | |
121 | for (; j<jmax; j++) { | |
122 | if (!cTree->GetEvent(j)) continue; | |
123 | Int_t ncl=clusters->GetEntriesFast(); | |
124 | while (ncl--) { | |
125 | AliITSclusterV2 *c=(AliITSclusterV2*)clusters->UncheckedAt(ncl); | |
126 | fgLayers[i].InsertCluster(new AliITSclusterV2(*c)); | |
127 | } | |
128 | clusters->Delete(); | |
129 | } | |
130 | fgLayers[i].ResetRoad(); //road defined by the cluster density | |
131 | } | |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
136 | void AliITStrackerV2::UnloadClusters() { | |
137 | //-------------------------------------------------------------------- | |
138 | //This function unloads ITS clusters | |
139 | //-------------------------------------------------------------------- | |
140 | for (Int_t i=0; i<kMaxLayer; i++) fgLayers[i].ResetClusters(); | |
141 | } | |
142 | ||
143 | static Int_t CorrectForDeadZoneMaterial(AliITStrackV2 *t) { | |
144 | //-------------------------------------------------------------------- | |
145 | // Correction for the material between the TPC and the ITS | |
146 | // (should it belong to the TPC code ?) | |
147 | //-------------------------------------------------------------------- | |
148 | Double_t riw=80., diw=0.0053, x0iw=30; // TPC inner wall ? | |
149 | Double_t rcd=61., dcd=0.0053, x0cd=30; // TPC "central drum" ? | |
150 | Double_t yr=12.8, dr=0.03; // rods ? | |
151 | Double_t zm=0.2, dm=0.40; // membrane | |
152 | //Double_t rr=52., dr=0.19, x0r=24., yyr=7.77; //rails | |
153 | Double_t rs=50., ds=0.001; // something belonging to the ITS (screen ?) | |
154 | ||
155 | if (t->GetX() > riw) { | |
156 | if (!t->PropagateTo(riw,diw,x0iw)) return 1; | |
157 | if (TMath::Abs(t->GetY())>yr) t->CorrectForMaterial(dr); | |
158 | if (TMath::Abs(t->GetZ())<zm) t->CorrectForMaterial(dm); | |
159 | if (!t->PropagateTo(rcd,dcd,x0cd)) return 1; | |
160 | //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z); | |
161 | //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,dr,x0r); | |
162 | if (!t->PropagateTo(rs,ds)) return 1; | |
163 | } else if (t->GetX() < rs) { | |
164 | if (!t->PropagateTo(rs,-ds)) return 1; | |
165 | //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z); | |
166 | //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,-dr,x0r); | |
167 | if (!t->PropagateTo(rcd,-dcd,x0cd)) return 1; | |
168 | if (!t->PropagateTo(riw,-diw,x0iw)) return 1; | |
169 | } else { | |
170 | ::Error("CorrectForDeadZoneMaterial","track is already in the dead zone !"); | |
171 | return 1; | |
172 | } | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | Int_t AliITStrackerV2::Clusters2Tracks(AliESD *event) { | |
178 | //-------------------------------------------------------------------- | |
179 | // This functions reconstructs ITS tracks | |
180 | // The clusters must be already loaded ! | |
181 | //-------------------------------------------------------------------- | |
182 | TObjArray itsTracks(15000); | |
183 | ||
184 | {/* Read ESD tracks */ | |
185 | Int_t nentr=event->GetNumberOfTracks(); | |
186 | Info("Clusters2Tracks", "Number of ESD tracks: %d\n", nentr); | |
187 | while (nentr--) { | |
188 | AliESDtrack *esd=event->GetTrack(nentr); | |
189 | ||
190 | if (esd->GetStatus() != AliESDtrack::kTPCin) continue; | |
191 | ||
192 | AliITStrackV2 *t=0; | |
193 | try { | |
194 | t=new AliITStrackV2(*esd); | |
195 | } catch (const Char_t *msg) { | |
196 | Warning("Clusters2Tracks",msg); | |
197 | delete t; | |
198 | continue; | |
199 | } | |
200 | if (TMath::Abs(t->GetD())>4) continue; | |
201 | ||
202 | if (CorrectForDeadZoneMaterial(t)!=0) { | |
203 | Warning("Clusters2Tracks", | |
204 | "failed to correct for the material in the dead zone !\n"); | |
205 | delete t; | |
206 | continue; | |
207 | } | |
208 | itsTracks.AddLast(t); | |
209 | } | |
210 | } /* End Read ESD tracks */ | |
211 | ||
212 | itsTracks.Sort(); | |
213 | Int_t nentr=itsTracks.GetEntriesFast(); | |
214 | ||
215 | Int_t ntrk=0; | |
216 | for (fPass=0; fPass<2; fPass++) { | |
217 | Int_t &constraint=fConstraint[fPass]; if (constraint<0) continue; | |
218 | for (Int_t i=0; i<nentr; i++) { | |
219 | AliITStrackV2 *t=(AliITStrackV2*)itsTracks.UncheckedAt(i); | |
220 | if (t==0) continue; //this track has been already tracked | |
221 | Int_t tpcLabel=t->GetLabel(); //save the TPC track label | |
222 | ||
223 | ResetTrackToFollow(*t); | |
224 | ResetBestTrack(); | |
225 | ||
226 | for (FollowProlongation(); fI<kMaxLayer; fI++) { | |
227 | while (TakeNextProlongation()) FollowProlongation(); | |
228 | } | |
229 | ||
230 | if (fBestTrack.GetNumberOfClusters() == 0) continue; | |
231 | ||
232 | if (fConstraint[fPass]) { | |
233 | ResetTrackToFollow(*t); | |
234 | if (!RefitAt(3.7, &fTrackToFollow, &fBestTrack)) continue; | |
235 | ResetBestTrack(); | |
236 | } | |
237 | ||
238 | fBestTrack.SetLabel(tpcLabel); | |
239 | fBestTrack.CookdEdx(); | |
240 | CookLabel(&fBestTrack,0.); //For comparison only | |
241 | fBestTrack.UpdateESDtrack(AliESDtrack::kITSin); | |
242 | UseClusters(&fBestTrack); | |
243 | delete itsTracks.RemoveAt(i); | |
244 | ntrk++; | |
245 | } | |
246 | } | |
247 | ||
248 | itsTracks.Delete(); | |
249 | ||
250 | Info("Clusters2Tracks","Number of prolonged tracks: %d\n",ntrk); | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | Int_t AliITStrackerV2::Clusters2Tracks(TTree *tpcTree, TTree *itsTree) { | |
256 | //-------------------------------------------------------------------- | |
257 | // This functions reconstructs ITS tracks | |
258 | // The clusters must be already loaded ! | |
259 | //-------------------------------------------------------------------- | |
260 | Int_t nentr=0; TObjArray itsTracks(15000); | |
261 | ||
262 | Warning("Clusters2Tracks(TTree *, TTree *)", | |
263 | "Will be removed soon ! Use Clusters2Tracks(AliESD *) instead."); | |
264 | ||
265 | {/* Read TPC tracks */ | |
266 | AliTPCtrack *itrack=new AliTPCtrack; | |
267 | TBranch *branch=tpcTree->GetBranch("tracks"); | |
268 | if (!branch) { | |
269 | Error("Clusters2Tracks","Can't get the branch !"); | |
270 | return 1; | |
271 | } | |
272 | tpcTree->SetBranchAddress("tracks",&itrack); | |
273 | nentr=(Int_t)tpcTree->GetEntries(); | |
274 | ||
275 | Info("Clusters2Tracks","Number of TPC tracks: %d\n",nentr); | |
276 | ||
277 | for (Int_t i=0; i<nentr; i++) { | |
278 | tpcTree->GetEvent(i); | |
279 | AliITStrackV2 *t=0; | |
280 | try { | |
281 | t=new AliITStrackV2(*itrack); | |
282 | } catch (const Char_t *msg) { | |
283 | Warning("Clusters2Tracks",msg); | |
284 | delete t; | |
285 | continue; | |
286 | } | |
287 | if (TMath::Abs(t->GetD())>4) continue; | |
288 | ||
289 | if (CorrectForDeadZoneMaterial(t)!=0) { | |
290 | Warning("Clusters2Tracks", | |
291 | "failed to correct for the material in the dead zone !\n"); | |
292 | continue; | |
293 | } | |
294 | ||
295 | itsTracks.AddLast(t); | |
296 | } | |
297 | delete itrack; | |
298 | } | |
299 | itsTracks.Sort(); | |
300 | nentr=itsTracks.GetEntriesFast(); | |
301 | ||
302 | ||
303 | AliITStrackV2 *otrack=&fBestTrack; | |
304 | TBranch *branch=itsTree->GetBranch("tracks"); | |
305 | if (!branch) itsTree->Branch("tracks","AliITStrackV2",&otrack,32000,3); | |
306 | else branch->SetAddress(&otrack); | |
307 | ||
308 | for (fPass=0; fPass<2; fPass++) { | |
309 | Int_t &constraint=fConstraint[fPass]; if (constraint<0) continue; | |
310 | for (Int_t i=0; i<nentr; i++) { | |
311 | AliITStrackV2 *t=(AliITStrackV2*)itsTracks.UncheckedAt(i); | |
312 | if (t==0) continue; //this track has been already tracked | |
313 | Int_t tpcLabel=t->GetLabel(); //save the TPC track label | |
314 | ||
315 | ResetTrackToFollow(*t); | |
316 | ResetBestTrack(); | |
317 | ||
318 | for (FollowProlongation(); fI<kMaxLayer; fI++) { | |
319 | while (TakeNextProlongation()) FollowProlongation(); | |
320 | } | |
321 | ||
322 | if (fBestTrack.GetNumberOfClusters() == 0) continue; | |
323 | ||
324 | if (fConstraint[fPass]) { | |
325 | ResetTrackToFollow(*t); | |
326 | if (!RefitAt(3.7, &fTrackToFollow, &fBestTrack)) continue; | |
327 | ResetBestTrack(); | |
328 | } | |
329 | ||
330 | fBestTrack.SetLabel(tpcLabel); | |
331 | fBestTrack.CookdEdx(); | |
332 | CookLabel(&fBestTrack,0.); //For comparison only | |
333 | itsTree->Fill(); | |
334 | UseClusters(&fBestTrack); | |
335 | delete itsTracks.RemoveAt(i); | |
336 | } | |
337 | } | |
338 | ||
339 | nentr=(Int_t)itsTree->GetEntries(); | |
340 | Info("Clusters2Tracks","Number of prolonged tracks: %d\n",nentr); | |
341 | ||
342 | itsTracks.Delete(); | |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
347 | Int_t AliITStrackerV2::PropagateBack(AliESD *event) { | |
348 | //-------------------------------------------------------------------- | |
349 | // This functions propagates reconstructed ITS tracks back | |
350 | // The clusters must be loaded ! | |
351 | //-------------------------------------------------------------------- | |
352 | Int_t nentr=event->GetNumberOfTracks(); | |
353 | Info("PropagateBack", "Number of ESD tracks: %d\n", nentr); | |
354 | ||
355 | Int_t ntrk=0; | |
356 | for (Int_t i=0; i<nentr; i++) { | |
357 | AliESDtrack *esd=event->GetTrack(i); | |
358 | ||
359 | if (esd->GetStatus()!=(AliESDtrack::kTPCin|AliESDtrack::kITSin)) continue; | |
360 | ||
361 | AliITStrackV2 *t=0; | |
362 | try { | |
363 | t=new AliITStrackV2(*esd); | |
364 | } catch (const Char_t *msg) { | |
365 | Warning("PropagateBack",msg); | |
366 | delete t; | |
367 | continue; | |
368 | } | |
369 | ||
370 | ResetTrackToFollow(*t); | |
371 | ||
372 | // propagete to vertex [SR, GSI 17.02.2003] | |
373 | // Start Time measurement [SR, GSI 17.02.2003], corrected by I.Belikov | |
374 | if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) { | |
375 | if (fTrackToFollow.PropagateToVertex()) { | |
376 | fTrackToFollow.StartTimeIntegral(); | |
377 | } | |
378 | fTrackToFollow.PropagateTo(3.,-0.0028,65.19); | |
379 | } | |
380 | ||
381 | fTrackToFollow.ResetCovariance(); fTrackToFollow.ResetClusters(); | |
382 | if (RefitAt(49.,&fTrackToFollow,t)) { | |
383 | if (CorrectForDeadZoneMaterial(&fTrackToFollow)!=0) { | |
384 | Warning("PropagateBack", | |
385 | "failed to correct for the material in the dead zone !\n"); | |
386 | delete t; | |
387 | continue; | |
388 | } | |
389 | fTrackToFollow.SetLabel(t->GetLabel()); | |
390 | fTrackToFollow.CookdEdx(); | |
391 | CookLabel(&fTrackToFollow,0.); //For comparison only | |
392 | fTrackToFollow.UpdateESDtrack(AliESDtrack::kITSout); | |
393 | UseClusters(&fTrackToFollow); | |
394 | ntrk++; | |
395 | } | |
396 | delete t; | |
397 | } | |
398 | ||
399 | Info("PropagateBack","Number of back propagated ITS tracks: %d\n",ntrk); | |
400 | ||
401 | return 0; | |
402 | } | |
403 | ||
404 | Int_t AliITStrackerV2::RefitInward(AliESD *event) { | |
405 | //-------------------------------------------------------------------- | |
406 | // This functions refits ITS tracks using the | |
407 | // "inward propagated" TPC tracks | |
408 | // The clusters must be loaded ! | |
409 | //-------------------------------------------------------------------- | |
410 | Int_t nentr=event->GetNumberOfTracks(); | |
411 | Info("RefitInward", "Number of ESD tracks: %d\n", nentr); | |
412 | ||
413 | Int_t ntrk=0; | |
414 | for (Int_t i=0; i<nentr; i++) { | |
415 | AliESDtrack *esd=event->GetTrack(i); | |
416 | ||
417 | ULong_t flags = AliESDtrack::kITSin | AliESDtrack::kTPCrefit; | |
418 | ||
419 | if ( (esd->GetStatus() & flags) != flags ) continue; | |
420 | if ( esd->GetStatus() & AliESDtrack::kITSrefit) continue; | |
421 | ||
422 | AliITStrackV2 *t=0; | |
423 | try { | |
424 | t=new AliITStrackV2(*esd); | |
425 | } catch (const Char_t *msg) { | |
426 | Warning("RefitInward",msg); | |
427 | delete t; | |
428 | continue; | |
429 | } | |
430 | ||
431 | if (CorrectForDeadZoneMaterial(t)!=0) { | |
432 | Warning("RefitInward", | |
433 | "failed to correct for the material in the dead zone !\n"); | |
434 | delete t; | |
435 | continue; | |
436 | } | |
437 | ||
438 | ResetTrackToFollow(*t); | |
439 | fTrackToFollow.ResetClusters(); | |
440 | ||
441 | //Refitting... | |
442 | if (RefitAt(3.7, &fTrackToFollow, t)) { | |
443 | fTrackToFollow.SetLabel(t->GetLabel()); | |
444 | fTrackToFollow.CookdEdx(); | |
445 | CookLabel(&fTrackToFollow,0.); //For comparison only | |
446 | ||
447 | if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) {//The beam pipe | |
448 | Double_t a=fTrackToFollow.GetAlpha(); | |
449 | Double_t cs=TMath::Cos(a),sn=TMath::Sin(a); | |
450 | Double_t xv= GetX()*cs + GetY()*sn; | |
451 | Double_t yv=-GetX()*sn + GetY()*cs; | |
452 | ||
453 | Double_t c=fTrackToFollow.GetC(), snp=fTrackToFollow.GetSnp(); | |
454 | Double_t x=fTrackToFollow.GetX(), y=fTrackToFollow.GetY(); | |
455 | Double_t tgfv=-(c*(x-xv)-snp)/(c*(y-yv) + TMath::Sqrt(1.-snp*snp)); | |
456 | Double_t fv=TMath::ATan(tgfv); | |
457 | ||
458 | cs=TMath::Cos(fv); sn=TMath::Sin(fv); | |
459 | x = xv*cs + yv*sn; | |
460 | yv=-xv*sn + yv*cs; xv=x; | |
461 | ||
462 | if (fTrackToFollow.Propagate(fv+a,xv)) { | |
463 | fTrackToFollow.UpdateESDtrack(AliESDtrack::kITSrefit); | |
464 | UseClusters(&fTrackToFollow); | |
465 | { | |
466 | AliITSclusterV2 c; c.SetY(yv); c.SetZ(GetZ()); | |
467 | c.SetSigmaY2(GetSigmaY()*GetSigmaY()); | |
468 | c.SetSigmaZ2(GetSigmaZ()*GetSigmaZ()); | |
469 | Double_t chi2=fTrackToFollow.GetPredictedChi2(&c); | |
470 | if (chi2<kMaxChi2) | |
471 | if (fTrackToFollow.Update(&c,-chi2,0)) | |
472 | fTrackToFollow.SetConstrainedESDtrack(chi2); | |
473 | } | |
474 | ntrk++; | |
475 | } | |
476 | } | |
477 | } | |
478 | delete t; | |
479 | } | |
480 | ||
481 | Info("RefitInward","Number of refitted tracks: %d\n",ntrk); | |
482 | ||
483 | return 0; | |
484 | } | |
485 | ||
486 | AliCluster *AliITStrackerV2::GetCluster(Int_t index) const { | |
487 | //-------------------------------------------------------------------- | |
488 | // Return pointer to a given cluster | |
489 | //-------------------------------------------------------------------- | |
490 | Int_t l=(index & 0xf0000000) >> 28; | |
491 | Int_t c=(index & 0x0fffffff) >> 00; | |
492 | return fgLayers[l].GetCluster(c); | |
493 | } | |
494 | ||
495 | ||
496 | void AliITStrackerV2::FollowProlongation() { | |
497 | //-------------------------------------------------------------------- | |
498 | //This function finds a track prolongation | |
499 | //-------------------------------------------------------------------- | |
500 | while (fI>fLastLayerToTrackTo) { | |
501 | Int_t i=fI-1; | |
502 | ||
503 | AliITSlayer &layer=fgLayers[i]; | |
504 | AliITStrackV2 &track=fTracks[i]; | |
505 | ||
506 | Double_t r=layer.GetR(); | |
507 | ||
508 | if (i==3 || i==1) { | |
509 | Double_t rs=0.5*(fgLayers[i+1].GetR() + r); | |
510 | Double_t d=0.0034, x0=38.6; | |
511 | if (i==1) {rs=9.; d=0.0097; x0=42;} | |
512 | if (!fTrackToFollow.PropagateTo(rs,d,x0)) { | |
513 | //Warning("FollowProlongation","propagation failed !\n"); | |
514 | return; | |
515 | } | |
516 | } | |
517 | ||
518 | //find intersection | |
519 | Double_t x,y,z; | |
520 | if (!fTrackToFollow.GetGlobalXYZat(r,x,y,z)) { | |
521 | //Warning("FollowProlongation","failed to estimate track !\n"); | |
522 | return; | |
523 | } | |
524 | Double_t phi=TMath::ATan2(y,x); | |
525 | ||
526 | Int_t idet=layer.FindDetectorIndex(phi,z); | |
527 | if (idet<0) { | |
528 | //Warning("FollowProlongation","failed to find a detector !\n"); | |
529 | return; | |
530 | } | |
531 | ||
532 | //propagate to the intersection | |
533 | const AliITSdetector &det=layer.GetDetector(idet); | |
534 | phi=det.GetPhi(); | |
535 | if (!fTrackToFollow.Propagate(phi,det.GetR())) { | |
536 | //Warning("FollowProlongation","propagation failed !\n"); | |
537 | return; | |
538 | } | |
539 | fTrackToFollow.SetDetectorIndex(idet); | |
540 | ||
541 | //Select possible prolongations and store the current track estimation | |
542 | track.~AliITStrackV2(); new(&track) AliITStrackV2(fTrackToFollow); | |
543 | Double_t dz=7*TMath::Sqrt(track.GetSigmaZ2() + kSigmaZ2[i]); | |
544 | Double_t dy=7*TMath::Sqrt(track.GetSigmaY2() + kSigmaY2[i]); | |
545 | Double_t road=layer.GetRoad(); | |
546 | if (dz*dy>road*road) { | |
547 | Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd; | |
548 | dz=road*scz; dy=road*scy; | |
549 | } | |
550 | ||
551 | //Double_t dz=4*TMath::Sqrt(track.GetSigmaZ2() + kSigmaZ2[i]); | |
552 | if (dz < 0.5*TMath::Abs(track.GetTgl())) dz=0.5*TMath::Abs(track.GetTgl()); | |
553 | if (dz > kMaxRoad) { | |
554 | //Warning("FollowProlongation","too broad road in Z !\n"); | |
555 | return; | |
556 | } | |
557 | ||
558 | if (TMath::Abs(fTrackToFollow.GetZ()-GetZ()) > r+dz) return; | |
559 | ||
560 | //Double_t dy=4*TMath::Sqrt(track.GetSigmaY2() + kSigmaY2[i]); | |
561 | if (dy < 0.5*TMath::Abs(track.GetSnp())) dy=0.5*TMath::Abs(track.GetSnp()); | |
562 | if (dy > kMaxRoad) { | |
563 | //Warning("FollowProlongation","too broad road in Y !\n"); | |
564 | return; | |
565 | } | |
566 | ||
567 | Double_t zmin=track.GetZ() - dz; | |
568 | Double_t zmax=track.GetZ() + dz; | |
569 | Double_t ymin=track.GetY() + r*phi - dy; | |
570 | Double_t ymax=track.GetY() + r*phi + dy; | |
571 | layer.SelectClusters(zmin,zmax,ymin,ymax); | |
572 | fI--; | |
573 | ||
574 | //take another prolongation | |
575 | if (!TakeNextProlongation()) | |
576 | if (fLayersNotToSkip[fI]) return; | |
577 | ||
578 | } | |
579 | ||
580 | //deal with the best track | |
581 | Int_t ncl=fTrackToFollow.GetNumberOfClusters(); | |
582 | Int_t nclb=fBestTrack.GetNumberOfClusters(); | |
583 | if (ncl) | |
584 | if (ncl >= nclb) { | |
585 | Double_t chi2=fTrackToFollow.GetChi2(); | |
586 | if (chi2/ncl < kChi2PerCluster) { | |
587 | if (ncl > nclb || chi2 < fBestTrack.GetChi2()) { | |
588 | ResetBestTrack(); | |
589 | } | |
590 | } | |
591 | } | |
592 | ||
593 | } | |
594 | ||
595 | Int_t AliITStrackerV2::TakeNextProlongation() { | |
596 | //-------------------------------------------------------------------- | |
597 | // This function takes another track prolongation | |
598 | // | |
599 | // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch | |
600 | //-------------------------------------------------------------------- | |
601 | AliITSlayer &layer=fgLayers[fI]; | |
602 | ResetTrackToFollow(fTracks[fI]); | |
603 | ||
604 | Double_t dz=7*TMath::Sqrt(fTrackToFollow.GetSigmaZ2() + kSigmaZ2[fI]); | |
605 | Double_t dy=7*TMath::Sqrt(fTrackToFollow.GetSigmaY2() + kSigmaY2[fI]); | |
606 | Double_t road=layer.GetRoad(); | |
607 | if (dz*dy>road*road) { | |
608 | Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd; | |
609 | dz=road*scz; dy=road*scy; | |
610 | } | |
611 | ||
612 | const AliITSclusterV2 *c=0; Int_t ci=-1; | |
613 | Double_t chi2=12345.; | |
614 | while ((c=layer.GetNextCluster(ci))!=0) { | |
615 | Int_t idet=c->GetDetectorIndex(); | |
616 | ||
617 | if (fTrackToFollow.GetDetectorIndex()!=idet) { | |
618 | const AliITSdetector &det=layer.GetDetector(idet); | |
619 | ResetTrackToFollow(fTracks[fI]); | |
620 | if (!fTrackToFollow.Propagate(det.GetPhi(),det.GetR())) { | |
621 | //Warning("TakeNextProlongation","propagation failed !\n"); | |
622 | continue; | |
623 | } | |
624 | fTrackToFollow.SetDetectorIndex(idet); | |
625 | if (TMath::Abs(fTrackToFollow.GetZ()-GetZ())>layer.GetR()+dz) continue; | |
626 | } | |
627 | ||
628 | if (TMath::Abs(fTrackToFollow.GetZ() - c->GetZ()) > dz) continue; | |
629 | if (TMath::Abs(fTrackToFollow.GetY() - c->GetY()) > dy) continue; | |
630 | ||
631 | chi2=fTrackToFollow.GetPredictedChi2(c); if (chi2<kMaxChi2) break; | |
632 | } | |
633 | ||
634 | if (chi2>=kMaxChi2) return 0; | |
635 | if (!c) return 0; | |
636 | ||
637 | if (!fTrackToFollow.Update(c,chi2,(fI<<28)+ci)) { | |
638 | //Warning("TakeNextProlongation","filtering failed !\n"); | |
639 | return 0; | |
640 | } | |
641 | ||
642 | if (fTrackToFollow.GetNumberOfClusters()>1) | |
643 | if (TMath::Abs(fTrackToFollow.GetD())>4) return 0; | |
644 | ||
645 | fTrackToFollow. | |
646 | SetSampledEdx(c->GetQ(),fTrackToFollow.GetNumberOfClusters()-1); //b.b. | |
647 | ||
648 | { | |
649 | Double_t x0; | |
650 | Double_t d=layer.GetThickness(fTrackToFollow.GetY(),fTrackToFollow.GetZ(),x0); | |
651 | fTrackToFollow.CorrectForMaterial(d,x0); | |
652 | } | |
653 | ||
654 | if (fConstraint[fPass]) { | |
655 | Double_t d=GetEffectiveThickness(0,0); //Think of this !!!! | |
656 | Double_t xyz[]={GetX(),GetY(),GetZ()}; | |
657 | Double_t ers[]={GetSigmaX(),GetSigmaY(),GetSigmaZ()}; | |
658 | fTrackToFollow.Improve(d,xyz,ers); | |
659 | } | |
660 | ||
661 | return 1; | |
662 | } | |
663 | ||
664 | ||
665 | AliITStrackerV2::AliITSlayer::AliITSlayer() { | |
666 | //-------------------------------------------------------------------- | |
667 | //default AliITSlayer constructor | |
668 | //-------------------------------------------------------------------- | |
669 | fN=0; | |
670 | fDetectors=0; | |
671 | } | |
672 | ||
673 | AliITStrackerV2::AliITSlayer:: | |
674 | AliITSlayer(Double_t r,Double_t p,Double_t z,Int_t nl,Int_t nd) { | |
675 | //-------------------------------------------------------------------- | |
676 | //main AliITSlayer constructor | |
677 | //-------------------------------------------------------------------- | |
678 | fR=r; fPhiOffset=p; fZOffset=z; | |
679 | fNladders=nl; fNdetectors=nd; | |
680 | fDetectors=new AliITSdetector[fNladders*fNdetectors]; | |
681 | ||
682 | fN=0; | |
683 | fI=0; | |
684 | ||
685 | fRoad=2*fR*TMath::Sqrt(3.14/1.);//assuming that there's only one cluster | |
686 | } | |
687 | ||
688 | AliITStrackerV2::AliITSlayer::~AliITSlayer() { | |
689 | //-------------------------------------------------------------------- | |
690 | // AliITSlayer destructor | |
691 | //-------------------------------------------------------------------- | |
692 | delete[] fDetectors; | |
693 | for (Int_t i=0; i<fN; i++) delete fClusters[i]; | |
694 | } | |
695 | ||
696 | void AliITStrackerV2::AliITSlayer::ResetClusters() { | |
697 | //-------------------------------------------------------------------- | |
698 | // This function removes loaded clusters | |
699 | //-------------------------------------------------------------------- | |
700 | for (Int_t i=0; i<fN; i++) delete fClusters[i]; | |
701 | fN=0; | |
702 | fI=0; | |
703 | } | |
704 | ||
705 | void AliITStrackerV2::AliITSlayer::ResetRoad() { | |
706 | //-------------------------------------------------------------------- | |
707 | // This function calculates the road defined by the cluster density | |
708 | //-------------------------------------------------------------------- | |
709 | Int_t n=0; | |
710 | for (Int_t i=0; i<fN; i++) { | |
711 | if (TMath::Abs(fClusters[i]->GetZ())<fR) n++; | |
712 | } | |
713 | if (n>1) fRoad=2*fR*TMath::Sqrt(3.14/n); | |
714 | } | |
715 | ||
716 | Int_t AliITStrackerV2::AliITSlayer::InsertCluster(AliITSclusterV2 *c) { | |
717 | //-------------------------------------------------------------------- | |
718 | //This function adds a cluster to this layer | |
719 | //-------------------------------------------------------------------- | |
720 | if (fN==kMaxClusterPerLayer) { | |
721 | ::Error("InsertCluster","Too many clusters !\n"); | |
722 | return 1; | |
723 | } | |
724 | ||
725 | if (fN==0) {fClusters[fN++]=c; return 0;} | |
726 | Int_t i=FindClusterIndex(c->GetZ()); | |
727 | memmove(fClusters+i+1 ,fClusters+i,(fN-i)*sizeof(AliITSclusterV2*)); | |
728 | fClusters[i]=c; fN++; | |
729 | ||
730 | return 0; | |
731 | } | |
732 | ||
733 | Int_t AliITStrackerV2::AliITSlayer::FindClusterIndex(Double_t z) const { | |
734 | //-------------------------------------------------------------------- | |
735 | // This function returns the index of the nearest cluster | |
736 | //-------------------------------------------------------------------- | |
737 | if (fN==0) return 0; | |
738 | if (z <= fClusters[0]->GetZ()) return 0; | |
739 | if (z > fClusters[fN-1]->GetZ()) return fN; | |
740 | Int_t b=0, e=fN-1, m=(b+e)/2; | |
741 | for (; b<e; m=(b+e)/2) { | |
742 | if (z > fClusters[m]->GetZ()) b=m+1; | |
743 | else e=m; | |
744 | } | |
745 | return m; | |
746 | } | |
747 | ||
748 | void AliITStrackerV2::AliITSlayer:: | |
749 | SelectClusters(Double_t zmin,Double_t zmax,Double_t ymin, Double_t ymax) { | |
750 | //-------------------------------------------------------------------- | |
751 | // This function sets the "window" | |
752 | //-------------------------------------------------------------------- | |
753 | fI=FindClusterIndex(zmin); fZmax=zmax; | |
754 | Double_t circle=2*TMath::Pi()*fR; | |
755 | if (ymax>circle) { ymax-=circle; ymin-=circle; } | |
756 | fYmin=ymin; fYmax=ymax; | |
757 | } | |
758 | ||
759 | const AliITSclusterV2 *AliITStrackerV2::AliITSlayer::GetNextCluster(Int_t &ci){ | |
760 | //-------------------------------------------------------------------- | |
761 | // This function returns clusters within the "window" | |
762 | //-------------------------------------------------------------------- | |
763 | const AliITSclusterV2 *cluster=0; | |
764 | for (Int_t i=fI; i<fN; i++) { | |
765 | const AliITSclusterV2 *c=fClusters[i]; | |
766 | if (c->GetZ() > fZmax) break; | |
767 | if (c->IsUsed()) continue; | |
768 | const AliITSdetector &det=GetDetector(c->GetDetectorIndex()); | |
769 | Double_t y=fR*det.GetPhi() + c->GetY(); | |
770 | ||
771 | if (y>2.*fR*TMath::Pi()) y -= 2*fR*TMath::Pi(); | |
772 | if (y>1.*fR*TMath::Pi() && fYmax<y) y -= 2*fR*TMath::Pi(); | |
773 | ||
774 | if (y<fYmin) continue; | |
775 | if (y>fYmax) continue; | |
776 | cluster=c; ci=i; | |
777 | fI=i+1; | |
778 | break; | |
779 | } | |
780 | ||
781 | return cluster; | |
782 | } | |
783 | ||
784 | Int_t AliITStrackerV2::AliITSlayer:: | |
785 | FindDetectorIndex(Double_t phi, Double_t z) const { | |
786 | //-------------------------------------------------------------------- | |
787 | //This function finds the detector crossed by the track | |
788 | //-------------------------------------------------------------------- | |
789 | Double_t dphi=-(phi-fPhiOffset); | |
790 | if (dphi < 0) dphi += 2*TMath::Pi(); | |
791 | else if (dphi >= 2*TMath::Pi()) dphi -= 2*TMath::Pi(); | |
792 | Int_t np=Int_t(dphi*fNladders*0.5/TMath::Pi()+0.5); | |
793 | if (np>=fNladders) np-=fNladders; | |
794 | if (np<0) np+=fNladders; | |
795 | ||
796 | Double_t dz=fZOffset-z; | |
797 | Int_t nz=Int_t(dz*(fNdetectors-1)*0.5/fZOffset+0.5); | |
798 | if (nz>=fNdetectors) return -1; | |
799 | if (nz<0) return -1; | |
800 | ||
801 | return np*fNdetectors + nz; | |
802 | } | |
803 | ||
804 | Double_t | |
805 | AliITStrackerV2::AliITSlayer::GetThickness(Double_t y,Double_t z,Double_t &x0) | |
806 | const { | |
807 | //-------------------------------------------------------------------- | |
808 | //This function returns the layer thickness at this point (units X0) | |
809 | //-------------------------------------------------------------------- | |
810 | Double_t d=0.0085; | |
811 | x0=21.82; | |
812 | ||
813 | if (43<fR&&fR<45) { //SSD2 | |
814 | Double_t dd=0.0034; | |
815 | d=dd; | |
816 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
817 | if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);} | |
818 | if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);} | |
819 | for (Int_t i=0; i<12; i++) { | |
820 | if (TMath::Abs(z-3.9*(i+0.5))<0.15) { | |
821 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
822 | d+=0.0034; | |
823 | break; | |
824 | } | |
825 | if (TMath::Abs(z+3.9*(i+0.5))<0.15) { | |
826 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
827 | d+=0.0034; | |
828 | break; | |
829 | } | |
830 | if (TMath::Abs(z-3.4-3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
831 | if (TMath::Abs(z+0.5+3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
832 | } | |
833 | } else | |
834 | if (37<fR&&fR<41) { //SSD1 | |
835 | Double_t dd=0.0034; | |
836 | d=dd; | |
837 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
838 | if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);} | |
839 | if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);} | |
840 | for (Int_t i=0; i<11; i++) { | |
841 | if (TMath::Abs(z-3.9*i)<0.15) { | |
842 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
843 | d+=dd; | |
844 | break; | |
845 | } | |
846 | if (TMath::Abs(z+3.9*i)<0.15) { | |
847 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
848 | d+=dd; | |
849 | break; | |
850 | } | |
851 | if (TMath::Abs(z-1.85-3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
852 | if (TMath::Abs(z+2.05+3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
853 | } | |
854 | } else | |
855 | if (13<fR&&fR<26) { //SDD | |
856 | Double_t dd=0.0033; | |
857 | d=dd; | |
858 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
859 | ||
860 | if (TMath::Abs(y-1.80)<0.55) { | |
861 | d+=0.016; | |
862 | for (Int_t j=0; j<20; j++) { | |
863 | if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
864 | if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
865 | } | |
866 | } | |
867 | if (TMath::Abs(y+1.80)<0.55) { | |
868 | d+=0.016; | |
869 | for (Int_t j=0; j<20; j++) { | |
870 | if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
871 | if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
872 | } | |
873 | } | |
874 | ||
875 | for (Int_t i=0; i<4; i++) { | |
876 | if (TMath::Abs(z-7.3*i)<0.60) { | |
877 | d+=dd; | |
878 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
879 | break; | |
880 | } | |
881 | if (TMath::Abs(z+7.3*i)<0.60) { | |
882 | d+=dd; | |
883 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
884 | break; | |
885 | } | |
886 | } | |
887 | } else | |
888 | if (6<fR&&fR<8) { //SPD2 | |
889 | Double_t dd=0.0063; x0=21.5; | |
890 | d=dd; | |
891 | if (TMath::Abs(y-3.08)>0.5) d+=dd; | |
892 | //if (TMath::Abs(y-3.08)>0.45) d+=dd; | |
893 | if (TMath::Abs(y-3.03)<0.10) {d+=0.014;} | |
894 | } else | |
895 | if (3<fR&&fR<5) { //SPD1 | |
896 | Double_t dd=0.0063; x0=21.5; | |
897 | d=dd; | |
898 | if (TMath::Abs(y+0.21)>0.6) d+=dd; | |
899 | //if (TMath::Abs(y+0.21)>0.45) d+=dd; | |
900 | if (TMath::Abs(y+0.10)<0.10) {d+=0.014;} | |
901 | } | |
902 | ||
903 | return d; | |
904 | } | |
905 | ||
906 | Double_t AliITStrackerV2::GetEffectiveThickness(Double_t y,Double_t z) const | |
907 | { | |
908 | //-------------------------------------------------------------------- | |
909 | //Returns the thickness between the current layer and the vertex (units X0) | |
910 | //-------------------------------------------------------------------- | |
911 | Double_t d=0.0028*3*3; //beam pipe | |
912 | Double_t x0=0; | |
913 | ||
914 | Double_t xn=fgLayers[fI].GetR(); | |
915 | for (Int_t i=0; i<fI; i++) { | |
916 | Double_t xi=fgLayers[i].GetR(); | |
917 | d+=fgLayers[i].GetThickness(y,z,x0)*xi*xi; | |
918 | } | |
919 | ||
920 | if (fI>1) { | |
921 | Double_t xi=9.; | |
922 | d+=0.0097*xi*xi; | |
923 | } | |
924 | ||
925 | if (fI>3) { | |
926 | Double_t xi=0.5*(fgLayers[3].GetR()+fgLayers[4].GetR()); | |
927 | d+=0.0034*xi*xi; | |
928 | } | |
929 | ||
930 | return d/(xn*xn); | |
931 | } | |
932 | ||
933 | Int_t AliITStrackerV2::AliITSlayer::InRoad() const { | |
934 | //-------------------------------------------------------------------- | |
935 | // This function returns number of clusters within the "window" | |
936 | //-------------------------------------------------------------------- | |
937 | Int_t ncl=0; | |
938 | for (Int_t i=fI; i<fN; i++) { | |
939 | const AliITSclusterV2 *c=fClusters[i]; | |
940 | if (c->GetZ() > fZmax) break; | |
941 | if (c->IsUsed()) continue; | |
942 | const AliITSdetector &det=GetDetector(c->GetDetectorIndex()); | |
943 | Double_t y=fR*det.GetPhi() + c->GetY(); | |
944 | ||
945 | if (y>2.*fR*TMath::Pi()) y -= 2*fR*TMath::Pi(); | |
946 | if (y>1.*fR*TMath::Pi() && fYmax<y) y -= 2*fR*TMath::Pi(); | |
947 | ||
948 | if (y<fYmin) continue; | |
949 | if (y>fYmax) continue; | |
950 | ncl++; | |
951 | } | |
952 | return ncl; | |
953 | } | |
954 | ||
955 | Bool_t | |
956 | AliITStrackerV2::RefitAt(Double_t xx,AliITStrackV2 *t,const AliITStrackV2 *c) { | |
957 | //-------------------------------------------------------------------- | |
958 | // This function refits the track "t" at the position "x" using | |
959 | // the clusters from "c" | |
960 | //-------------------------------------------------------------------- | |
961 | Int_t index[kMaxLayer]; | |
962 | Int_t k; | |
963 | for (k=0; k<kMaxLayer; k++) index[k]=-1; | |
964 | Int_t nc=c->GetNumberOfClusters(); | |
965 | for (k=0; k<nc; k++) { | |
966 | Int_t idx=c->GetClusterIndex(k),nl=(idx&0xf0000000)>>28; | |
967 | index[nl]=idx; | |
968 | } | |
969 | ||
970 | Int_t from, to, step; | |
971 | if (xx > t->GetX()) { | |
972 | from=0; to=kMaxLayer; | |
973 | step=+1; | |
974 | } else { | |
975 | from=kMaxLayer-1; to=-1; | |
976 | step=-1; | |
977 | } | |
978 | ||
979 | for (Int_t i=from; i != to; i += step) { | |
980 | AliITSlayer &layer=fgLayers[i]; | |
981 | Double_t r=layer.GetR(); | |
982 | ||
983 | { | |
984 | Double_t hI=i-0.5*step; | |
985 | if (TMath::Abs(hI-1.5)<0.01 || TMath::Abs(hI-3.5)<0.01) { | |
986 | Double_t rs=0.5*(fgLayers[i-step].GetR() + r); | |
987 | Double_t d=0.0034, x0=38.6; | |
988 | if (TMath::Abs(hI-1.5)<0.01) {rs=9.; d=0.0097; x0=42;} | |
989 | if (!t->PropagateTo(rs,-step*d,x0)) { | |
990 | return kFALSE; | |
991 | } | |
992 | } | |
993 | } | |
994 | ||
995 | // remember old position [SR, GSI 18.02.2003] | |
996 | Double_t oldX=0., oldY=0., oldZ=0.; | |
997 | if (t->IsStartedTimeIntegral() && step==1) { | |
998 | t->GetGlobalXYZat(t->GetX(),oldX,oldY,oldZ); | |
999 | } | |
1000 | // | |
1001 | ||
1002 | Double_t x,y,z; | |
1003 | if (!t->GetGlobalXYZat(r,x,y,z)) { | |
1004 | return kFALSE; | |
1005 | } | |
1006 | Double_t phi=TMath::ATan2(y,x); | |
1007 | Int_t idet=layer.FindDetectorIndex(phi,z); | |
1008 | if (idet<0) { | |
1009 | return kFALSE; | |
1010 | } | |
1011 | const AliITSdetector &det=layer.GetDetector(idet); | |
1012 | phi=det.GetPhi(); | |
1013 | if (!t->Propagate(phi,det.GetR())) { | |
1014 | return kFALSE; | |
1015 | } | |
1016 | t->SetDetectorIndex(idet); | |
1017 | ||
1018 | const AliITSclusterV2 *cl=0; | |
1019 | Double_t maxchi2=kMaxChi2; | |
1020 | ||
1021 | Int_t idx=index[i]; | |
1022 | if (idx>0) { | |
1023 | const AliITSclusterV2 *c=(AliITSclusterV2 *)GetCluster(idx); | |
1024 | if (idet != c->GetDetectorIndex()) { | |
1025 | idet=c->GetDetectorIndex(); | |
1026 | const AliITSdetector &det=layer.GetDetector(idet); | |
1027 | if (!t->Propagate(det.GetPhi(),det.GetR())) { | |
1028 | return kFALSE; | |
1029 | } | |
1030 | t->SetDetectorIndex(idet); | |
1031 | } | |
1032 | Double_t chi2=t->GetPredictedChi2(c); | |
1033 | if (chi2<maxchi2) { | |
1034 | cl=c; | |
1035 | maxchi2=chi2; | |
1036 | } else { | |
1037 | return kFALSE; | |
1038 | } | |
1039 | } | |
1040 | /* | |
1041 | if (cl==0) | |
1042 | if (t->GetNumberOfClusters()>2) { | |
1043 | Double_t dz=4*TMath::Sqrt(t->GetSigmaZ2()+kSigmaZ2[i]); | |
1044 | Double_t dy=4*TMath::Sqrt(t->GetSigmaY2()+kSigmaY2[i]); | |
1045 | Double_t zmin=t->GetZ() - dz; | |
1046 | Double_t zmax=t->GetZ() + dz; | |
1047 | Double_t ymin=t->GetY() + phi*r - dy; | |
1048 | Double_t ymax=t->GetY() + phi*r + dy; | |
1049 | layer.SelectClusters(zmin,zmax,ymin,ymax); | |
1050 | ||
1051 | const AliITSclusterV2 *c=0; Int_t ci=-1; | |
1052 | while ((c=layer.GetNextCluster(ci))!=0) { | |
1053 | if (idet != c->GetDetectorIndex()) continue; | |
1054 | Double_t chi2=t->GetPredictedChi2(c); | |
1055 | if (chi2<maxchi2) { cl=c; maxchi2=chi2; idx=ci; } | |
1056 | } | |
1057 | } | |
1058 | */ | |
1059 | if (cl) { | |
1060 | if (!t->Update(cl,maxchi2,idx)) { | |
1061 | return kFALSE; | |
1062 | } | |
1063 | t->SetSampledEdx(cl->GetQ(),t->GetNumberOfClusters()-1); | |
1064 | } | |
1065 | ||
1066 | { | |
1067 | Double_t x0; | |
1068 | Double_t d=layer.GetThickness(t->GetY(),t->GetZ(),x0); | |
1069 | t->CorrectForMaterial(-step*d,x0); | |
1070 | } | |
1071 | ||
1072 | // track time update [SR, GSI 17.02.2003] | |
1073 | if (t->IsStartedTimeIntegral() && step==1) { | |
1074 | Double_t newX, newY, newZ; | |
1075 | t->GetGlobalXYZat(t->GetX(),newX,newY,newZ); | |
1076 | Double_t dL2 = (oldX-newX)*(oldX-newX) + (oldY-newY)*(oldY-newY) + | |
1077 | (oldZ-newZ)*(oldZ-newZ); | |
1078 | t->AddTimeStep(TMath::Sqrt(dL2)); | |
1079 | } | |
1080 | // | |
1081 | ||
1082 | } | |
1083 | ||
1084 | if (!t->PropagateTo(xx,0.,0.)) return kFALSE; | |
1085 | return kTRUE; | |
1086 | } | |
1087 | ||
1088 | void AliITStrackerV2::UseClusters(const AliKalmanTrack *t, Int_t from) const { | |
1089 | //-------------------------------------------------------------------- | |
1090 | // This function marks clusters assigned to the track | |
1091 | //-------------------------------------------------------------------- | |
1092 | AliTracker::UseClusters(t,from); | |
1093 | ||
1094 | AliITSclusterV2 *c=(AliITSclusterV2 *)GetCluster(t->GetClusterIndex(0)); | |
1095 | //if (c->GetQ()>2) c->Use(); | |
1096 | if (c->GetSigmaZ2()>0.1) c->Use(); | |
1097 | c=(AliITSclusterV2 *)GetCluster(t->GetClusterIndex(1)); | |
1098 | //if (c->GetQ()>2) c->Use(); | |
1099 | if (c->GetSigmaZ2()>0.1) c->Use(); | |
1100 | ||
1101 | } |