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006b5f7f | 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 | |
00a7cc50 | 18 | // It reads AliITSRecPoint clusters and creates AliITStrackV2 tracks |
18856a77 | 19 | // and fills with them the ESD |
006b5f7f | 20 | // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch |
a9a2d814 | 21 | // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch |
006b5f7f | 22 | //------------------------------------------------------------------------- |
1f9a65c4 | 23 | |
9c369bfe | 24 | #include <new> |
25 | ||
006b5f7f | 26 | #include <TFile.h> |
27 | #include <TTree.h> | |
28 | #include <TRandom.h> | |
006b5f7f | 29 | |
30 | #include "AliITSgeom.h" | |
31 | #include "AliITSRecPoint.h" | |
c630aafd | 32 | #include "AliESD.h" |
00a7cc50 | 33 | #include "AliITSRecPoint.h" |
006b5f7f | 34 | #include "AliITStrackerV2.h" |
35 | ||
8676d691 | 36 | ClassImp(AliITStrackerV2) |
006b5f7f | 37 | |
18856a77 | 38 | AliITStrackerV2::AliITSlayer AliITStrackerV2::fgLayers[kMaxLayer]; // ITS layers |
006b5f7f | 39 | |
6c94f330 | 40 | AliITStrackerV2::AliITStrackerV2(): |
41 | AliTracker(), | |
42 | fI(kMaxLayer), | |
43 | fBestTrack(), | |
44 | fTrackToFollow(), | |
45 | fPass(0), | |
46 | fLastLayerToTrackTo(kLastLayerToTrackTo) | |
47 | { | |
48 | //-------------------------------------------------------------------- | |
49 | //This is the AliITStrackerV2 default constructor | |
50 | //-------------------------------------------------------------------- | |
51 | ||
52 | for (Int_t i=1; i<kMaxLayer+1; i++) new(fgLayers+i-1) AliITSlayer(); | |
53 | ||
54 | fConstraint[0]=1; fConstraint[1]=0; | |
55 | ||
56 | Double_t xyz[]={kXV,kYV,kZV}, ers[]={kSigmaXV,kSigmaYV,kSigmaZV}; | |
57 | SetVertex(xyz,ers); | |
58 | ||
59 | for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=kLayersNotToSkip[i]; | |
60 | ||
61 | } | |
62 | ||
63 | AliITStrackerV2::AliITStrackerV2(const AliITStrackerV2 &t): | |
64 | AliTracker(t), | |
65 | fI(t.fI), | |
66 | fBestTrack(t.fBestTrack), | |
67 | fTrackToFollow(t.fTrackToFollow), | |
68 | fPass(t.fPass), | |
69 | fLastLayerToTrackTo(t.fLastLayerToTrackTo) | |
70 | { | |
71 | //-------------------------------------------------------------------- | |
72 | //This is the AliITStrackerV2 copy constructor | |
73 | //-------------------------------------------------------------------- | |
74 | ||
75 | //for (Int_t i=1; i<kMaxLayer+1; i++) new(fgLayers+i-1) AliITSlayer(); | |
76 | ||
77 | fConstraint[0]=t.fConstraint[0]; fConstraint[1]=t.fConstraint[1]; | |
78 | ||
79 | Double_t xyz[]={kXV,kYV,kZV}, ers[]={kSigmaXV,kSigmaYV,kSigmaZV}; | |
80 | xyz[0]=t.GetX(); xyz[1]=t.GetY(); xyz[2]=t.GetZ(); | |
81 | ers[0]=t.GetSigmaX(); ers[1]=t.GetSigmaY(); ers[2]=t.GetSigmaZ(); | |
82 | SetVertex(xyz,ers); | |
83 | ||
84 | for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=t.fLayersNotToSkip[i]; | |
85 | ||
86 | } | |
87 | ||
88 | AliITStrackerV2::AliITStrackerV2(const AliITSgeom *geom) : | |
89 | AliTracker(), | |
90 | fI(kMaxLayer), | |
91 | fBestTrack(), | |
92 | fTrackToFollow(), | |
93 | fPass(0), | |
94 | fLastLayerToTrackTo(kLastLayerToTrackTo) | |
95 | { | |
006b5f7f | 96 | //-------------------------------------------------------------------- |
61ab8ea8 | 97 | //This is the AliITStrackerV2 constructor |
006b5f7f | 98 | //-------------------------------------------------------------------- |
006b5f7f | 99 | AliITSgeom *g=(AliITSgeom*)geom; |
100 | ||
c219fd63 | 101 | Float_t x,y,z; Int_t i; |
c630aafd | 102 | for (i=1; i<kMaxLayer+1; i++) { |
006b5f7f | 103 | Int_t nlad=g->GetNladders(i); |
104 | Int_t ndet=g->GetNdetectors(i); | |
105 | ||
106 | g->GetTrans(i,1,1,x,y,z); | |
107 | Double_t r=TMath::Sqrt(x*x + y*y); | |
108 | Double_t poff=TMath::ATan2(y,x); | |
109 | Double_t zoff=z; | |
110 | ||
111 | g->GetTrans(i,1,2,x,y,z); | |
112 | r += TMath::Sqrt(x*x + y*y); | |
113 | g->GetTrans(i,2,1,x,y,z); | |
114 | r += TMath::Sqrt(x*x + y*y); | |
115 | g->GetTrans(i,2,2,x,y,z); | |
116 | r += TMath::Sqrt(x*x + y*y); | |
117 | r*=0.25; | |
118 | ||
18856a77 | 119 | new (fgLayers+i-1) AliITSlayer(r,poff,zoff,nlad,ndet); |
006b5f7f | 120 | |
121 | for (Int_t j=1; j<nlad+1; j++) { | |
122 | for (Int_t k=1; k<ndet+1; k++) { //Fill this layer with detectors | |
123 | Float_t x,y,zshift; g->GetTrans(i,j,k,x,y,zshift); | |
124 | Double_t rot[9]; g->GetRotMatrix(i,j,k,rot); | |
125 | ||
f363d377 | 126 | Double_t phi=TMath::ATan2(rot[1],rot[0])+TMath::Pi(); |
127 | phi+=TMath::Pi()/2; | |
128 | if (i==1) phi+=TMath::Pi(); | |
c219fd63 | 129 | |
130 | if (phi<0) phi+=TMath::TwoPi(); | |
131 | else if (phi>=TMath::TwoPi()) phi-=TMath::TwoPi(); | |
132 | ||
f363d377 | 133 | Double_t cp=TMath::Cos(phi), sp=TMath::Sin(phi); |
134 | Double_t r=x*cp+y*sp; | |
006b5f7f | 135 | |
18856a77 | 136 | AliITSdetector &det=fgLayers[i-1].GetDetector((j-1)*ndet + k-1); |
006b5f7f | 137 | new(&det) AliITSdetector(r,phi); |
138 | } | |
139 | } | |
c630aafd | 140 | |
006b5f7f | 141 | } |
142 | ||
c219fd63 | 143 | fConstraint[0]=1; fConstraint[1]=0; |
8676d691 | 144 | |
145 | Double_t xyz[]={kXV,kYV,kZV}, ers[]={kSigmaXV,kSigmaYV,kSigmaZV}; | |
146 | SetVertex(xyz,ers); | |
c0dd5278 | 147 | |
148 | for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=kLayersNotToSkip[i]; | |
c0dd5278 | 149 | |
150 | } | |
151 | ||
152 | void AliITStrackerV2::SetLayersNotToSkip(Int_t *l) { | |
153 | //-------------------------------------------------------------------- | |
154 | //This function set masks of the layers which must be not skipped | |
155 | //-------------------------------------------------------------------- | |
156 | for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=l[i]; | |
61ab8ea8 | 157 | } |
006b5f7f | 158 | |
c630aafd | 159 | Int_t AliITStrackerV2::LoadClusters(TTree *cTree) { |
61ab8ea8 | 160 | //-------------------------------------------------------------------- |
161 | //This function loads ITS clusters | |
162 | //-------------------------------------------------------------------- | |
00a7cc50 | 163 | TBranch *branch=cTree->GetBranch("ITSRecPoints"); |
61ab8ea8 | 164 | if (!branch) { |
c630aafd | 165 | Error("LoadClusters"," can't get the branch !\n"); |
8676d691 | 166 | return 1; |
61ab8ea8 | 167 | } |
006b5f7f | 168 | |
00a7cc50 | 169 | TClonesArray dummy("AliITSRecPoint",10000), *clusters=&dummy; |
61ab8ea8 | 170 | branch->SetAddress(&clusters); |
006b5f7f | 171 | |
61ab8ea8 | 172 | Int_t j=0; |
173 | for (Int_t i=0; i<kMaxLayer; i++) { | |
18856a77 | 174 | Int_t ndet=fgLayers[i].GetNdetectors(); |
175 | Int_t jmax = j + fgLayers[i].GetNladders()*ndet; | |
c219fd63 | 176 | |
177 | Double_t r=fgLayers[i].GetR(); | |
178 | Double_t circ=TMath::TwoPi()*r; | |
179 | ||
61ab8ea8 | 180 | for (; j<jmax; j++) { |
181 | if (!cTree->GetEvent(j)) continue; | |
182 | Int_t ncl=clusters->GetEntriesFast(); | |
183 | while (ncl--) { | |
00a7cc50 | 184 | AliITSRecPoint *c=(AliITSRecPoint*)clusters->UncheckedAt(ncl); |
c219fd63 | 185 | |
186 | Int_t idx=c->GetDetectorIndex(); | |
187 | Double_t y=r*fgLayers[i].GetDetector(idx).GetPhi()+c->GetY(); | |
188 | if (y>circ) y-=circ; else if (y<0) y+=circ; | |
189 | c->SetPhiR(y); | |
190 | ||
00a7cc50 | 191 | fgLayers[i].InsertCluster(new AliITSRecPoint(*c)); |
61ab8ea8 | 192 | } |
193 | clusters->Delete(); | |
194 | } | |
18856a77 | 195 | fgLayers[i].ResetRoad(); //road defined by the cluster density |
006b5f7f | 196 | } |
c630aafd | 197 | |
8676d691 | 198 | return 0; |
61ab8ea8 | 199 | } |
006b5f7f | 200 | |
61ab8ea8 | 201 | void AliITStrackerV2::UnloadClusters() { |
202 | //-------------------------------------------------------------------- | |
203 | //This function unloads ITS clusters | |
204 | //-------------------------------------------------------------------- | |
18856a77 | 205 | for (Int_t i=0; i<kMaxLayer; i++) fgLayers[i].ResetClusters(); |
006b5f7f | 206 | } |
207 | ||
880f41b9 | 208 | static Int_t CorrectForDeadZoneMaterial(AliITStrackV2 *t) { |
209 | //-------------------------------------------------------------------- | |
210 | // Correction for the material between the TPC and the ITS | |
211 | // (should it belong to the TPC code ?) | |
212 | //-------------------------------------------------------------------- | |
213 | Double_t riw=80., diw=0.0053, x0iw=30; // TPC inner wall ? | |
214 | Double_t rcd=61., dcd=0.0053, x0cd=30; // TPC "central drum" ? | |
215 | Double_t yr=12.8, dr=0.03; // rods ? | |
216 | Double_t zm=0.2, dm=0.40; // membrane | |
217 | //Double_t rr=52., dr=0.19, x0r=24., yyr=7.77; //rails | |
218 | Double_t rs=50., ds=0.001; // something belonging to the ITS (screen ?) | |
219 | ||
220 | if (t->GetX() > riw) { | |
221 | if (!t->PropagateTo(riw,diw,x0iw)) return 1; | |
222 | if (TMath::Abs(t->GetY())>yr) t->CorrectForMaterial(dr); | |
223 | if (TMath::Abs(t->GetZ())<zm) t->CorrectForMaterial(dm); | |
224 | if (!t->PropagateTo(rcd,dcd,x0cd)) return 1; | |
225 | //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z); | |
226 | //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,dr,x0r); | |
227 | if (!t->PropagateTo(rs,ds)) return 1; | |
228 | } else if (t->GetX() < rs) { | |
229 | if (!t->PropagateTo(rs,-ds)) return 1; | |
230 | //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z); | |
231 | //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,-dr,x0r); | |
232 | if (!t->PropagateTo(rcd,-dcd,x0cd)) return 1; | |
ba1a3e1a | 233 | if (!t->PropagateTo(riw+0.001,-diw,x0iw)) return 1; |
880f41b9 | 234 | } else { |
235 | ::Error("CorrectForDeadZoneMaterial","track is already in the dead zone !"); | |
236 | return 1; | |
237 | } | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
c630aafd | 242 | Int_t AliITStrackerV2::Clusters2Tracks(AliESD *event) { |
006b5f7f | 243 | //-------------------------------------------------------------------- |
c630aafd | 244 | // This functions reconstructs ITS tracks |
245 | // The clusters must be already loaded ! | |
006b5f7f | 246 | //-------------------------------------------------------------------- |
c630aafd | 247 | TObjArray itsTracks(15000); |
006b5f7f | 248 | |
c630aafd | 249 | {/* Read ESD tracks */ |
250 | Int_t nentr=event->GetNumberOfTracks(); | |
251 | Info("Clusters2Tracks", "Number of ESD tracks: %d\n", nentr); | |
252 | while (nentr--) { | |
253 | AliESDtrack *esd=event->GetTrack(nentr); | |
254 | ||
ba1a3e1a | 255 | if ((esd->GetStatus()&AliESDtrack::kTPCin)==0) continue; |
256 | if (esd->GetStatus()&AliESDtrack::kTPCout) continue; | |
257 | if (esd->GetStatus()&AliESDtrack::kITSin) continue; | |
c630aafd | 258 | |
259 | AliITStrackV2 *t=0; | |
260 | try { | |
261 | t=new AliITStrackV2(*esd); | |
262 | } catch (const Char_t *msg) { | |
263 | Warning("Clusters2Tracks",msg); | |
264 | delete t; | |
265 | continue; | |
266 | } | |
6c94f330 | 267 | if (TMath::Abs(t->GetD(GetX(),GetY()))>4) { |
ebd8369c | 268 | delete t; |
269 | continue; | |
270 | } | |
006b5f7f | 271 | |
c630aafd | 272 | if (CorrectForDeadZoneMaterial(t)!=0) { |
273 | Warning("Clusters2Tracks", | |
274 | "failed to correct for the material in the dead zone !\n"); | |
275 | delete t; | |
276 | continue; | |
277 | } | |
278 | itsTracks.AddLast(t); | |
279 | } | |
280 | } /* End Read ESD tracks */ | |
281 | ||
282 | itsTracks.Sort(); | |
283 | Int_t nentr=itsTracks.GetEntriesFast(); | |
15dd636f | 284 | |
c630aafd | 285 | Int_t ntrk=0; |
286 | for (fPass=0; fPass<2; fPass++) { | |
287 | Int_t &constraint=fConstraint[fPass]; if (constraint<0) continue; | |
288 | for (Int_t i=0; i<nentr; i++) { | |
289 | AliITStrackV2 *t=(AliITStrackV2*)itsTracks.UncheckedAt(i); | |
15dd636f | 290 | if (t==0) continue; //this track has been already tracked |
c630aafd | 291 | Int_t tpcLabel=t->GetLabel(); //save the TPC track label |
292 | ||
293 | ResetTrackToFollow(*t); | |
294 | ResetBestTrack(); | |
295 | ||
296 | for (FollowProlongation(); fI<kMaxLayer; fI++) { | |
15dd636f | 297 | while (TakeNextProlongation()) FollowProlongation(); |
c630aafd | 298 | } |
299 | ||
de5d3595 | 300 | if (fBestTrack.GetNumberOfClusters() == 0) continue; |
15dd636f | 301 | |
c630aafd | 302 | if (fConstraint[fPass]) { |
15dd636f | 303 | ResetTrackToFollow(*t); |
304 | if (!RefitAt(3.7, &fTrackToFollow, &fBestTrack)) continue; | |
305 | ResetBestTrack(); | |
306 | } | |
307 | ||
c630aafd | 308 | fBestTrack.SetLabel(tpcLabel); |
309 | fBestTrack.CookdEdx(); | |
310 | CookLabel(&fBestTrack,0.); //For comparison only | |
311 | fBestTrack.UpdateESDtrack(AliESDtrack::kITSin); | |
15dd636f | 312 | UseClusters(&fBestTrack); |
c630aafd | 313 | delete itsTracks.RemoveAt(i); |
314 | ntrk++; | |
315 | } | |
316 | } | |
babd135a | 317 | |
c630aafd | 318 | itsTracks.Delete(); |
2257f27e | 319 | |
c630aafd | 320 | Info("Clusters2Tracks","Number of prolonged tracks: %d\n",ntrk); |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
c630aafd | 325 | Int_t AliITStrackerV2::PropagateBack(AliESD *event) { |
326 | //-------------------------------------------------------------------- | |
327 | // This functions propagates reconstructed ITS tracks back | |
328 | // The clusters must be loaded ! | |
329 | //-------------------------------------------------------------------- | |
330 | Int_t nentr=event->GetNumberOfTracks(); | |
331 | Info("PropagateBack", "Number of ESD tracks: %d\n", nentr); | |
332 | ||
333 | Int_t ntrk=0; | |
334 | for (Int_t i=0; i<nentr; i++) { | |
335 | AliESDtrack *esd=event->GetTrack(i); | |
336 | ||
ba1a3e1a | 337 | if ((esd->GetStatus()&AliESDtrack::kITSin)==0) continue; |
338 | if (esd->GetStatus()&AliESDtrack::kITSout) continue; | |
c630aafd | 339 | |
340 | AliITStrackV2 *t=0; | |
341 | try { | |
342 | t=new AliITStrackV2(*esd); | |
343 | } catch (const Char_t *msg) { | |
344 | Warning("PropagateBack",msg); | |
345 | delete t; | |
346 | continue; | |
347 | } | |
348 | ||
349 | ResetTrackToFollow(*t); | |
350 | ||
351 | // propagete to vertex [SR, GSI 17.02.2003] | |
a9459f9c | 352 | // Start Time measurement [SR, GSI 17.02.2003], corrected by I.Belikov |
353 | if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) { | |
6c94f330 | 354 | if (fTrackToFollow.PropagateToVertex(event->GetVertex())) { |
a9459f9c | 355 | fTrackToFollow.StartTimeIntegral(); |
356 | } | |
357 | fTrackToFollow.PropagateTo(3.,-0.0028,65.19); | |
358 | } | |
c630aafd | 359 | |
6c94f330 | 360 | fTrackToFollow.ResetCovariance(10.); fTrackToFollow.ResetClusters(); |
c630aafd | 361 | if (RefitAt(49.,&fTrackToFollow,t)) { |
362 | if (CorrectForDeadZoneMaterial(&fTrackToFollow)!=0) { | |
363 | Warning("PropagateBack", | |
364 | "failed to correct for the material in the dead zone !\n"); | |
365 | delete t; | |
366 | continue; | |
367 | } | |
368 | fTrackToFollow.SetLabel(t->GetLabel()); | |
ba1a3e1a | 369 | //fTrackToFollow.CookdEdx(); |
c630aafd | 370 | CookLabel(&fTrackToFollow,0.); //For comparison only |
371 | fTrackToFollow.UpdateESDtrack(AliESDtrack::kITSout); | |
15dd636f | 372 | UseClusters(&fTrackToFollow); |
c630aafd | 373 | ntrk++; |
374 | } | |
375 | delete t; | |
376 | } | |
377 | ||
378 | Info("PropagateBack","Number of back propagated ITS tracks: %d\n",ntrk); | |
61ab8ea8 | 379 | |
83d73500 | 380 | return 0; |
381 | } | |
382 | ||
c630aafd | 383 | Int_t AliITStrackerV2::RefitInward(AliESD *event) { |
83d73500 | 384 | //-------------------------------------------------------------------- |
385 | // This functions refits ITS tracks using the | |
386 | // "inward propagated" TPC tracks | |
c630aafd | 387 | // The clusters must be loaded ! |
83d73500 | 388 | //-------------------------------------------------------------------- |
c630aafd | 389 | Int_t nentr=event->GetNumberOfTracks(); |
390 | Info("RefitInward", "Number of ESD tracks: %d\n", nentr); | |
391 | ||
392 | Int_t ntrk=0; | |
393 | for (Int_t i=0; i<nentr; i++) { | |
394 | AliESDtrack *esd=event->GetTrack(i); | |
395 | ||
ba1a3e1a | 396 | if ((esd->GetStatus()&AliESDtrack::kITSout) == 0) continue; |
397 | if (esd->GetStatus()&AliESDtrack::kITSrefit) continue; | |
398 | if (esd->GetStatus()&AliESDtrack::kTPCout) | |
15dd636f | 399 | if ((esd->GetStatus()&AliESDtrack::kTPCrefit)==0) continue; |
c630aafd | 400 | |
401 | AliITStrackV2 *t=0; | |
402 | try { | |
403 | t=new AliITStrackV2(*esd); | |
404 | } catch (const Char_t *msg) { | |
405 | Warning("RefitInward",msg); | |
406 | delete t; | |
407 | continue; | |
408 | } | |
409 | ||
410 | if (CorrectForDeadZoneMaterial(t)!=0) { | |
411 | Warning("RefitInward", | |
412 | "failed to correct for the material in the dead zone !\n"); | |
413 | delete t; | |
414 | continue; | |
415 | } | |
416 | ||
417 | ResetTrackToFollow(*t); | |
418 | fTrackToFollow.ResetClusters(); | |
419 | ||
420 | //Refitting... | |
ef7253ac | 421 | if (RefitAt(3.7, &fTrackToFollow, t, kTRUE)) { |
c630aafd | 422 | fTrackToFollow.SetLabel(t->GetLabel()); |
423 | fTrackToFollow.CookdEdx(); | |
15dd636f | 424 | CookLabel(&fTrackToFollow,0.); //For comparison only |
18856a77 | 425 | |
49d13e89 | 426 | if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) {//The beam pipe |
427 | AliESDtrack *esdTrack =fTrackToFollow.GetESDtrack(); | |
428 | esdTrack->UpdateTrackParams(&fTrackToFollow,AliESDtrack::kITSrefit); | |
429 | Float_t r[3]={0.,0.,0.}; | |
430 | Double_t maxD=3.; | |
431 | esdTrack->RelateToVertex(event->GetVertex(),GetBz(r),maxD); | |
432 | ntrk++; | |
67c3dcbe | 433 | } |
c630aafd | 434 | } |
435 | delete t; | |
436 | } | |
437 | ||
438 | Info("RefitInward","Number of refitted tracks: %d\n",ntrk); | |
83d73500 | 439 | |
c630aafd | 440 | return 0; |
441 | } | |
83d73500 | 442 | |
006b5f7f | 443 | AliCluster *AliITStrackerV2::GetCluster(Int_t index) const { |
444 | //-------------------------------------------------------------------- | |
445 | // Return pointer to a given cluster | |
446 | //-------------------------------------------------------------------- | |
447 | Int_t l=(index & 0xf0000000) >> 28; | |
448 | Int_t c=(index & 0x0fffffff) >> 00; | |
18856a77 | 449 | return fgLayers[l].GetCluster(c); |
006b5f7f | 450 | } |
451 | ||
452 | ||
453 | void AliITStrackerV2::FollowProlongation() { | |
454 | //-------------------------------------------------------------------- | |
455 | //This function finds a track prolongation | |
456 | //-------------------------------------------------------------------- | |
c0dd5278 | 457 | while (fI>fLastLayerToTrackTo) { |
a9a2d814 | 458 | Int_t i=fI-1; |
8676d691 | 459 | |
18856a77 | 460 | AliITSlayer &layer=fgLayers[i]; |
a9a2d814 | 461 | AliITStrackV2 &track=fTracks[i]; |
006b5f7f | 462 | |
14825d5a | 463 | Double_t r=layer.GetR(); |
61ab8ea8 | 464 | |
a9a2d814 | 465 | if (i==3 || i==1) { |
18856a77 | 466 | Double_t rs=0.5*(fgLayers[i+1].GetR() + r); |
61ab8ea8 | 467 | Double_t d=0.0034, x0=38.6; |
468 | if (i==1) {rs=9.; d=0.0097; x0=42;} | |
469 | if (!fTrackToFollow.PropagateTo(rs,d,x0)) { | |
8676d691 | 470 | //Warning("FollowProlongation","propagation failed !\n"); |
c0dd5278 | 471 | return; |
a9a2d814 | 472 | } |
006b5f7f | 473 | } |
474 | ||
475 | //find intersection | |
476 | Double_t x,y,z; | |
14825d5a | 477 | if (!fTrackToFollow.GetGlobalXYZat(r,x,y,z)) { |
8676d691 | 478 | //Warning("FollowProlongation","failed to estimate track !\n"); |
c0dd5278 | 479 | return; |
006b5f7f | 480 | } |
481 | Double_t phi=TMath::ATan2(y,x); | |
f363d377 | 482 | |
006b5f7f | 483 | Int_t idet=layer.FindDetectorIndex(phi,z); |
484 | if (idet<0) { | |
8676d691 | 485 | //Warning("FollowProlongation","failed to find a detector !\n"); |
c0dd5278 | 486 | return; |
006b5f7f | 487 | } |
488 | ||
489 | //propagate to the intersection | |
490 | const AliITSdetector &det=layer.GetDetector(idet); | |
14825d5a | 491 | phi=det.GetPhi(); |
a9a2d814 | 492 | if (!fTrackToFollow.Propagate(phi,det.GetR())) { |
8676d691 | 493 | //Warning("FollowProlongation","propagation failed !\n"); |
c0dd5278 | 494 | return; |
006b5f7f | 495 | } |
496 | fTrackToFollow.SetDetectorIndex(idet); | |
497 | ||
498 | //Select possible prolongations and store the current track estimation | |
499 | track.~AliITStrackV2(); new(&track) AliITStrackV2(fTrackToFollow); | |
8676d691 | 500 | Double_t dz=7*TMath::Sqrt(track.GetSigmaZ2() + kSigmaZ2[i]); |
501 | Double_t dy=7*TMath::Sqrt(track.GetSigmaY2() + kSigmaY2[i]); | |
502 | Double_t road=layer.GetRoad(); | |
503 | if (dz*dy>road*road) { | |
504 | Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd; | |
505 | dz=road*scz; dy=road*scy; | |
506 | } | |
b87bd7cd | 507 | |
508 | //Double_t dz=4*TMath::Sqrt(track.GetSigmaZ2() + kSigmaZ2[i]); | |
14825d5a | 509 | if (dz < 0.5*TMath::Abs(track.GetTgl())) dz=0.5*TMath::Abs(track.GetTgl()); |
7f6ddf58 | 510 | if (dz > kMaxRoad) { |
8676d691 | 511 | //Warning("FollowProlongation","too broad road in Z !\n"); |
c0dd5278 | 512 | return; |
006b5f7f | 513 | } |
a9a2d814 | 514 | |
15dd636f | 515 | if (TMath::Abs(fTrackToFollow.GetZ()-GetZ()) > r+dz) return; |
a9a2d814 | 516 | |
b87bd7cd | 517 | //Double_t dy=4*TMath::Sqrt(track.GetSigmaY2() + kSigmaY2[i]); |
14825d5a | 518 | if (dy < 0.5*TMath::Abs(track.GetSnp())) dy=0.5*TMath::Abs(track.GetSnp()); |
7f6ddf58 | 519 | if (dy > kMaxRoad) { |
8676d691 | 520 | //Warning("FollowProlongation","too broad road in Y !\n"); |
c0dd5278 | 521 | return; |
006b5f7f | 522 | } |
a9a2d814 | 523 | |
c219fd63 | 524 | fI--; |
525 | ||
7f6ddf58 | 526 | Double_t zmin=track.GetZ() - dz; |
006b5f7f | 527 | Double_t zmax=track.GetZ() + dz; |
14825d5a | 528 | Double_t ymin=track.GetY() + r*phi - dy; |
529 | Double_t ymax=track.GetY() + r*phi + dy; | |
c219fd63 | 530 | if (layer.SelectClusters(zmin,zmax,ymin,ymax)==0) |
531 | if (fLayersNotToSkip[fI]) return; | |
006b5f7f | 532 | |
15dd636f | 533 | if (!TakeNextProlongation()) |
534 | if (fLayersNotToSkip[fI]) return; | |
535 | ||
006b5f7f | 536 | } |
537 | ||
538 | //deal with the best track | |
539 | Int_t ncl=fTrackToFollow.GetNumberOfClusters(); | |
540 | Int_t nclb=fBestTrack.GetNumberOfClusters(); | |
15dd636f | 541 | if (ncl) |
542 | if (ncl >= nclb) { | |
543 | Double_t chi2=fTrackToFollow.GetChi2(); | |
544 | if (chi2/ncl < kChi2PerCluster) { | |
545 | if (ncl > nclb || chi2 < fBestTrack.GetChi2()) { | |
546 | ResetBestTrack(); | |
006b5f7f | 547 | } |
15dd636f | 548 | } |
006b5f7f | 549 | } |
15dd636f | 550 | |
006b5f7f | 551 | } |
552 | ||
006b5f7f | 553 | Int_t AliITStrackerV2::TakeNextProlongation() { |
554 | //-------------------------------------------------------------------- | |
a9a2d814 | 555 | // This function takes another track prolongation |
556 | // | |
557 | // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch | |
006b5f7f | 558 | //-------------------------------------------------------------------- |
18856a77 | 559 | AliITSlayer &layer=fgLayers[fI]; |
4ab260d6 | 560 | ResetTrackToFollow(fTracks[fI]); |
006b5f7f | 561 | |
b87bd7cd | 562 | Double_t dz=7*TMath::Sqrt(fTrackToFollow.GetSigmaZ2() + kSigmaZ2[fI]); |
563 | Double_t dy=7*TMath::Sqrt(fTrackToFollow.GetSigmaY2() + kSigmaY2[fI]); | |
8676d691 | 564 | Double_t road=layer.GetRoad(); |
565 | if (dz*dy>road*road) { | |
566 | Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd; | |
567 | dz=road*scz; dy=road*scy; | |
568 | } | |
006b5f7f | 569 | |
00a7cc50 | 570 | const AliITSRecPoint *c=0; Int_t ci=-1; |
571 | const AliITSRecPoint *cc=0; Int_t cci=-1; | |
c219fd63 | 572 | Double_t chi2=kMaxChi2; |
006b5f7f | 573 | while ((c=layer.GetNextCluster(ci))!=0) { |
006b5f7f | 574 | Int_t idet=c->GetDetectorIndex(); |
15dd636f | 575 | |
4ab260d6 | 576 | if (fTrackToFollow.GetDetectorIndex()!=idet) { |
006b5f7f | 577 | const AliITSdetector &det=layer.GetDetector(idet); |
4ab260d6 | 578 | ResetTrackToFollow(fTracks[fI]); |
579 | if (!fTrackToFollow.Propagate(det.GetPhi(),det.GetR())) { | |
8676d691 | 580 | //Warning("TakeNextProlongation","propagation failed !\n"); |
006b5f7f | 581 | continue; |
582 | } | |
4ab260d6 | 583 | fTrackToFollow.SetDetectorIndex(idet); |
584 | if (TMath::Abs(fTrackToFollow.GetZ()-GetZ())>layer.GetR()+dz) continue; | |
006b5f7f | 585 | } |
586 | ||
4ab260d6 | 587 | if (TMath::Abs(fTrackToFollow.GetZ() - c->GetZ()) > dz) continue; |
588 | if (TMath::Abs(fTrackToFollow.GetY() - c->GetY()) > dy) continue; | |
006b5f7f | 589 | |
c219fd63 | 590 | Double_t ch2=fTrackToFollow.GetPredictedChi2(c); |
591 | if (ch2 > chi2) continue; | |
592 | chi2=ch2; | |
593 | cc=c; cci=ci; | |
594 | break; | |
006b5f7f | 595 | } |
596 | ||
c219fd63 | 597 | if (!cc) return 0; |
006b5f7f | 598 | |
c219fd63 | 599 | if (!fTrackToFollow.Update(cc,chi2,(fI<<28)+cci)) { |
8676d691 | 600 | //Warning("TakeNextProlongation","filtering failed !\n"); |
006b5f7f | 601 | return 0; |
602 | } | |
15dd636f | 603 | |
4ab260d6 | 604 | if (fTrackToFollow.GetNumberOfClusters()>1) |
6c94f330 | 605 | if (TMath::Abs(fTrackToFollow.GetD(GetX(),GetY()))>4) return 0; |
4ab260d6 | 606 | |
a9a2d814 | 607 | fTrackToFollow. |
c219fd63 | 608 | SetSampledEdx(cc->GetQ(),fTrackToFollow.GetNumberOfClusters()-1); //b.b. |
a9a2d814 | 609 | |
610 | { | |
880f41b9 | 611 | Double_t x0; |
61ab8ea8 | 612 | Double_t d=layer.GetThickness(fTrackToFollow.GetY(),fTrackToFollow.GetZ(),x0); |
880f41b9 | 613 | fTrackToFollow.CorrectForMaterial(d,x0); |
a9a2d814 | 614 | } |
4ab260d6 | 615 | |
a9a2d814 | 616 | if (fConstraint[fPass]) { |
4ab260d6 | 617 | Double_t d=GetEffectiveThickness(0,0); //Think of this !!!! |
8676d691 | 618 | Double_t xyz[]={GetX(),GetY(),GetZ()}; |
619 | Double_t ers[]={GetSigmaX(),GetSigmaY(),GetSigmaZ()}; | |
620 | fTrackToFollow.Improve(d,xyz,ers); | |
a9a2d814 | 621 | } |
006b5f7f | 622 | |
006b5f7f | 623 | return 1; |
624 | } | |
625 | ||
626 | ||
6c94f330 | 627 | AliITStrackerV2::AliITSlayer::AliITSlayer(): |
628 | fR(0.), | |
629 | fPhiOffset(0.), | |
630 | fNladders(0), | |
631 | fZOffset(0.), | |
632 | fNdetectors(0), | |
633 | fDetectors(0), | |
634 | fNsel(0), | |
635 | fRoad(2*fR*TMath::Sqrt(3.14/1.)) //assuming that there's only one cluster | |
636 | { | |
006b5f7f | 637 | //-------------------------------------------------------------------- |
638 | //default AliITSlayer constructor | |
639 | //-------------------------------------------------------------------- | |
c219fd63 | 640 | |
641 | for (Int_t i=0; i<kNsector; i++) fN[i]=0; | |
c219fd63 | 642 | |
006b5f7f | 643 | } |
644 | ||
645 | AliITStrackerV2::AliITSlayer:: | |
6c94f330 | 646 | AliITSlayer(Double_t r,Double_t p,Double_t z,Int_t nl,Int_t nd): |
647 | fR(r), | |
648 | fPhiOffset(p), | |
649 | fNladders(nl), | |
650 | fZOffset(z), | |
651 | fNdetectors(nd), | |
652 | fDetectors(new AliITSdetector[nl*nd]), | |
653 | fNsel(0), | |
654 | fRoad(2*r*TMath::Sqrt(3.14/1.)) //assuming that there's only one cluster | |
655 | { | |
006b5f7f | 656 | //-------------------------------------------------------------------- |
657 | //main AliITSlayer constructor | |
658 | //-------------------------------------------------------------------- | |
006b5f7f | 659 | |
c219fd63 | 660 | for (Int_t i=0; i<kNsector; i++) fN[i]=0; |
c219fd63 | 661 | |
662 | for (Int_t i=0; i<kMaxClusterPerLayer; i++) fClusters[i]=0; | |
b87bd7cd | 663 | |
006b5f7f | 664 | } |
665 | ||
666 | AliITStrackerV2::AliITSlayer::~AliITSlayer() { | |
667 | //-------------------------------------------------------------------- | |
668 | // AliITSlayer destructor | |
669 | //-------------------------------------------------------------------- | |
670 | delete[] fDetectors; | |
c219fd63 | 671 | ResetClusters(); |
006b5f7f | 672 | } |
673 | ||
61ab8ea8 | 674 | void AliITStrackerV2::AliITSlayer::ResetClusters() { |
675 | //-------------------------------------------------------------------- | |
676 | // This function removes loaded clusters | |
677 | //-------------------------------------------------------------------- | |
c219fd63 | 678 | for (Int_t s=0; s<kNsector; s++) { |
679 | Int_t &n=fN[s]; | |
680 | while (n) { | |
681 | n--; | |
682 | delete fClusters[s*kMaxClusterPerSector+n]; | |
683 | } | |
684 | } | |
61ab8ea8 | 685 | } |
686 | ||
b87bd7cd | 687 | void AliITStrackerV2::AliITSlayer::ResetRoad() { |
688 | //-------------------------------------------------------------------- | |
689 | // This function calculates the road defined by the cluster density | |
690 | //-------------------------------------------------------------------- | |
691 | Int_t n=0; | |
c219fd63 | 692 | for (Int_t s=0; s<kNsector; s++) { |
693 | Int_t i=fN[s]; | |
694 | while (i--) | |
695 | if (TMath::Abs(fClusters[s*kMaxClusterPerSector+i]->GetZ())<fR) n++; | |
b87bd7cd | 696 | } |
697 | if (n>1) fRoad=2*fR*TMath::Sqrt(3.14/n); | |
698 | } | |
699 | ||
00a7cc50 | 700 | Int_t AliITStrackerV2::AliITSlayer::InsertCluster(AliITSRecPoint *c) { |
006b5f7f | 701 | //-------------------------------------------------------------------- |
c219fd63 | 702 | // This function inserts a cluster to this layer in increasing |
703 | // order of the cluster's fZ | |
006b5f7f | 704 | //-------------------------------------------------------------------- |
c219fd63 | 705 | Float_t circ=TMath::TwoPi()*fR; |
706 | Int_t sec=Int_t(kNsector*c->GetPhiR()/circ); | |
81e97e0d | 707 | if (sec>=kNsector) { |
708 | ::Error("InsertCluster","Wrong sector !\n"); | |
709 | return 1; | |
710 | } | |
c219fd63 | 711 | Int_t &n=fN[sec]; |
712 | if (n>=kMaxClusterPerSector) { | |
713 | ::Error("InsertCluster","Too many clusters !\n"); | |
714 | return 1; | |
006b5f7f | 715 | } |
c219fd63 | 716 | if (n==0) fClusters[sec*kMaxClusterPerSector]=c; |
717 | else { | |
718 | Int_t i=FindClusterIndex(c->GetZ(),sec); | |
719 | Int_t k=n-i+sec*kMaxClusterPerSector; | |
00a7cc50 | 720 | memmove(fClusters+i+1 ,fClusters+i,k*sizeof(AliITSRecPoint*)); |
c219fd63 | 721 | fClusters[i]=c; |
722 | } | |
723 | n++; | |
006b5f7f | 724 | return 0; |
725 | } | |
726 | ||
c219fd63 | 727 | Int_t |
728 | AliITStrackerV2::AliITSlayer::FindClusterIndex(Float_t z,Int_t s) const { | |
006b5f7f | 729 | //-------------------------------------------------------------------- |
c219fd63 | 730 | // For the sector "s", this function returns the index of the first |
731 | // with its fZ >= "z". | |
006b5f7f | 732 | //-------------------------------------------------------------------- |
c219fd63 | 733 | Int_t nc=fN[s]; |
734 | if (nc==0) return kMaxClusterPerSector*s; | |
735 | ||
736 | Int_t b=kMaxClusterPerSector*s; | |
737 | if (z <= fClusters[b]->GetZ()) return b; | |
738 | ||
739 | Int_t e=b+nc-1; | |
740 | if (z > fClusters[e]->GetZ()) return e+1; | |
741 | ||
742 | Int_t m=(b+e)/2; | |
006b5f7f | 743 | for (; b<e; m=(b+e)/2) { |
744 | if (z > fClusters[m]->GetZ()) b=m+1; | |
745 | else e=m; | |
746 | } | |
747 | return m; | |
748 | } | |
749 | ||
c219fd63 | 750 | Int_t AliITStrackerV2::AliITSlayer:: |
751 | SelectClusters(Float_t zmin,Float_t zmax,Float_t ymin, Float_t ymax) { | |
006b5f7f | 752 | //-------------------------------------------------------------------- |
c219fd63 | 753 | // This function selects clusters within the "window" |
006b5f7f | 754 | //-------------------------------------------------------------------- |
c219fd63 | 755 | Float_t circ=fR*TMath::TwoPi(); |
756 | ||
757 | if (ymin>circ) ymin-=circ; else if (ymin<0) ymin+=circ; | |
758 | if (ymax>circ) ymax-=circ; else if (ymax<0) ymax+=circ; | |
759 | ||
521f4796 | 760 | Int_t i1=Int_t(kNsector*ymin/circ); if (i1==kNsector) i1--; |
c219fd63 | 761 | if (fN[i1]!=0) { |
762 | Float_t ym = (ymax<ymin) ? ymax+circ : ymax; | |
763 | Int_t i=FindClusterIndex(zmin,i1), imax=i1*kMaxClusterPerSector+fN[i1]; | |
764 | for (; i<imax; i++) { | |
00a7cc50 | 765 | AliITSRecPoint *c=fClusters[i]; |
c219fd63 | 766 | if (c->IsUsed()) continue; |
767 | if (c->GetZ()>zmax) break; | |
768 | if (c->GetPhiR()<=ymin) continue; | |
769 | if (c->GetPhiR()>ym) continue; | |
770 | fIndex[fNsel++]=i; | |
771 | } | |
772 | } | |
773 | ||
521f4796 | 774 | Int_t i2=Int_t(kNsector*ymax/circ); if (i2==kNsector) i2--; |
c219fd63 | 775 | if (i2==i1) return fNsel; |
776 | ||
777 | if (fN[i2]!=0) { | |
778 | Float_t ym = (ymin>ymax) ? ymin-circ : ymin; | |
779 | Int_t i=FindClusterIndex(zmin,i2), imax=i2*kMaxClusterPerSector+fN[i2]; | |
780 | for (; i<imax; i++) { | |
00a7cc50 | 781 | AliITSRecPoint *c=fClusters[i]; |
c219fd63 | 782 | if (c->IsUsed()) continue; |
783 | if (c->GetZ()>zmax) break; | |
784 | if (c->GetPhiR()<=ym) continue; | |
785 | if (c->GetPhiR()>ymax) continue; | |
786 | fIndex[fNsel++]=i; | |
787 | } | |
788 | } | |
789 | ||
790 | return fNsel; | |
006b5f7f | 791 | } |
792 | ||
00a7cc50 | 793 | const AliITSRecPoint *AliITStrackerV2::AliITSlayer::GetNextCluster(Int_t &ci){ |
006b5f7f | 794 | //-------------------------------------------------------------------- |
795 | // This function returns clusters within the "window" | |
796 | //-------------------------------------------------------------------- | |
00a7cc50 | 797 | AliITSRecPoint *c=0; |
c219fd63 | 798 | ci=-1; |
799 | if (fNsel) { | |
800 | fNsel--; | |
801 | ci=fIndex[fNsel]; | |
802 | c=fClusters[ci]; | |
006b5f7f | 803 | } |
c219fd63 | 804 | return c; |
805 | } | |
7f6ddf58 | 806 | |
c219fd63 | 807 | Int_t AliITStrackerV2::AliITSlayer::GetNumberOfClusters() const { |
808 | Int_t n=0; | |
809 | for (Int_t s=0; s<kNsector; s++) n+=fN[s]; | |
810 | return n; | |
006b5f7f | 811 | } |
812 | ||
c219fd63 | 813 | Int_t |
814 | AliITStrackerV2::AliITSlayer::FindDetectorIndex(Double_t phi,Double_t z)const { | |
006b5f7f | 815 | //-------------------------------------------------------------------- |
816 | //This function finds the detector crossed by the track | |
817 | //-------------------------------------------------------------------- | |
f363d377 | 818 | Double_t dphi=-(phi-fPhiOffset); |
006b5f7f | 819 | if (dphi < 0) dphi += 2*TMath::Pi(); |
820 | else if (dphi >= 2*TMath::Pi()) dphi -= 2*TMath::Pi(); | |
821 | Int_t np=Int_t(dphi*fNladders*0.5/TMath::Pi()+0.5); | |
3e3e8427 | 822 | if (np>=fNladders) np-=fNladders; |
823 | if (np<0) np+=fNladders; | |
006b5f7f | 824 | |
825 | Double_t dz=fZOffset-z; | |
826 | Int_t nz=Int_t(dz*(fNdetectors-1)*0.5/fZOffset+0.5); | |
3e3e8427 | 827 | if (nz>=fNdetectors) return -1; |
828 | if (nz<0) return -1; | |
006b5f7f | 829 | |
006b5f7f | 830 | return np*fNdetectors + nz; |
831 | } | |
832 | ||
833 | Double_t | |
61ab8ea8 | 834 | AliITStrackerV2::AliITSlayer::GetThickness(Double_t y,Double_t z,Double_t &x0) |
835 | const { | |
a9a2d814 | 836 | //-------------------------------------------------------------------- |
837 | //This function returns the layer thickness at this point (units X0) | |
838 | //-------------------------------------------------------------------- | |
839 | Double_t d=0.0085; | |
61ab8ea8 | 840 | x0=21.82; |
a9a2d814 | 841 | |
842 | if (43<fR&&fR<45) { //SSD2 | |
61ab8ea8 | 843 | Double_t dd=0.0034; |
844 | d=dd; | |
845 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
846 | if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);} | |
847 | if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);} | |
a9a2d814 | 848 | for (Int_t i=0; i<12; i++) { |
61ab8ea8 | 849 | if (TMath::Abs(z-3.9*(i+0.5))<0.15) { |
850 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
851 | d+=0.0034; | |
852 | break; | |
853 | } | |
854 | if (TMath::Abs(z+3.9*(i+0.5))<0.15) { | |
855 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
856 | d+=0.0034; | |
857 | break; | |
858 | } | |
859 | if (TMath::Abs(z-3.4-3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
860 | if (TMath::Abs(z+0.5+3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
a9a2d814 | 861 | } |
862 | } else | |
863 | if (37<fR&&fR<41) { //SSD1 | |
61ab8ea8 | 864 | Double_t dd=0.0034; |
865 | d=dd; | |
866 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
867 | if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);} | |
868 | if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);} | |
a9a2d814 | 869 | for (Int_t i=0; i<11; i++) { |
61ab8ea8 | 870 | if (TMath::Abs(z-3.9*i)<0.15) { |
871 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
872 | d+=dd; | |
873 | break; | |
874 | } | |
875 | if (TMath::Abs(z+3.9*i)<0.15) { | |
876 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
877 | d+=dd; | |
878 | break; | |
879 | } | |
880 | if (TMath::Abs(z-1.85-3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
881 | if (TMath::Abs(z+2.05+3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
a9a2d814 | 882 | } |
883 | } else | |
884 | if (13<fR&&fR<26) { //SDD | |
61ab8ea8 | 885 | Double_t dd=0.0033; |
886 | d=dd; | |
887 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
888 | ||
889 | if (TMath::Abs(y-1.80)<0.55) { | |
890 | d+=0.016; | |
891 | for (Int_t j=0; j<20; j++) { | |
892 | if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
893 | if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
894 | } | |
895 | } | |
896 | if (TMath::Abs(y+1.80)<0.55) { | |
897 | d+=0.016; | |
898 | for (Int_t j=0; j<20; j++) { | |
899 | if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
900 | if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
901 | } | |
902 | } | |
903 | ||
904 | for (Int_t i=0; i<4; i++) { | |
905 | if (TMath::Abs(z-7.3*i)<0.60) { | |
906 | d+=dd; | |
907 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
908 | break; | |
909 | } | |
910 | if (TMath::Abs(z+7.3*i)<0.60) { | |
911 | d+=dd; | |
912 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
913 | break; | |
914 | } | |
a9a2d814 | 915 | } |
916 | } else | |
917 | if (6<fR&&fR<8) { //SPD2 | |
61ab8ea8 | 918 | Double_t dd=0.0063; x0=21.5; |
919 | d=dd; | |
920 | if (TMath::Abs(y-3.08)>0.5) d+=dd; | |
921 | //if (TMath::Abs(y-3.08)>0.45) d+=dd; | |
922 | if (TMath::Abs(y-3.03)<0.10) {d+=0.014;} | |
a9a2d814 | 923 | } else |
924 | if (3<fR&&fR<5) { //SPD1 | |
61ab8ea8 | 925 | Double_t dd=0.0063; x0=21.5; |
926 | d=dd; | |
927 | if (TMath::Abs(y+0.21)>0.6) d+=dd; | |
928 | //if (TMath::Abs(y+0.21)>0.45) d+=dd; | |
929 | if (TMath::Abs(y+0.10)<0.10) {d+=0.014;} | |
a9a2d814 | 930 | } |
931 | ||
a9a2d814 | 932 | return d; |
933 | } | |
006b5f7f | 934 | |
a9a2d814 | 935 | Double_t AliITStrackerV2::GetEffectiveThickness(Double_t y,Double_t z) const |
006b5f7f | 936 | { |
937 | //-------------------------------------------------------------------- | |
a9a2d814 | 938 | //Returns the thickness between the current layer and the vertex (units X0) |
006b5f7f | 939 | //-------------------------------------------------------------------- |
61ab8ea8 | 940 | Double_t d=0.0028*3*3; //beam pipe |
941 | Double_t x0=0; | |
006b5f7f | 942 | |
18856a77 | 943 | Double_t xn=fgLayers[fI].GetR(); |
006b5f7f | 944 | for (Int_t i=0; i<fI; i++) { |
18856a77 | 945 | Double_t xi=fgLayers[i].GetR(); |
946 | d+=fgLayers[i].GetThickness(y,z,x0)*xi*xi; | |
006b5f7f | 947 | } |
948 | ||
949 | if (fI>1) { | |
61ab8ea8 | 950 | Double_t xi=9.; |
951 | d+=0.0097*xi*xi; | |
006b5f7f | 952 | } |
953 | ||
954 | if (fI>3) { | |
18856a77 | 955 | Double_t xi=0.5*(fgLayers[3].GetR()+fgLayers[4].GetR()); |
61ab8ea8 | 956 | d+=0.0034*xi*xi; |
006b5f7f | 957 | } |
61ab8ea8 | 958 | |
006b5f7f | 959 | return d/(xn*xn); |
960 | } | |
961 | ||
ef7253ac | 962 | Bool_t AliITStrackerV2::RefitAt(Double_t xx,AliITStrackV2 *t, |
963 | const AliITStrackV2 *c, Bool_t extra) { | |
4ab260d6 | 964 | //-------------------------------------------------------------------- |
c630aafd | 965 | // This function refits the track "t" at the position "x" using |
966 | // the clusters from "c" | |
ef7253ac | 967 | // If "extra"==kTRUE, |
968 | // the clusters from overlapped modules get attached to "t" | |
4ab260d6 | 969 | //-------------------------------------------------------------------- |
880f41b9 | 970 | Int_t index[kMaxLayer]; |
971 | Int_t k; | |
972 | for (k=0; k<kMaxLayer; k++) index[k]=-1; | |
c630aafd | 973 | Int_t nc=c->GetNumberOfClusters(); |
880f41b9 | 974 | for (k=0; k<nc; k++) { |
c630aafd | 975 | Int_t idx=c->GetClusterIndex(k),nl=(idx&0xf0000000)>>28; |
880f41b9 | 976 | index[nl]=idx; |
977 | } | |
880f41b9 | 978 | |
4ab260d6 | 979 | Int_t from, to, step; |
ee34184f | 980 | if (xx > t->GetX()) { |
4ab260d6 | 981 | from=0; to=kMaxLayer; |
982 | step=+1; | |
983 | } else { | |
984 | from=kMaxLayer-1; to=-1; | |
985 | step=-1; | |
986 | } | |
987 | ||
988 | for (Int_t i=from; i != to; i += step) { | |
18856a77 | 989 | AliITSlayer &layer=fgLayers[i]; |
4ab260d6 | 990 | Double_t r=layer.GetR(); |
991 | ||
992 | { | |
993 | Double_t hI=i-0.5*step; | |
880f41b9 | 994 | if (TMath::Abs(hI-1.5)<0.01 || TMath::Abs(hI-3.5)<0.01) { |
18856a77 | 995 | Double_t rs=0.5*(fgLayers[i-step].GetR() + r); |
61ab8ea8 | 996 | Double_t d=0.0034, x0=38.6; |
880f41b9 | 997 | if (TMath::Abs(hI-1.5)<0.01) {rs=9.; d=0.0097; x0=42;} |
998 | if (!t->PropagateTo(rs,-step*d,x0)) { | |
4ab260d6 | 999 | return kFALSE; |
1000 | } | |
1001 | } | |
1002 | } | |
1003 | ||
880f41b9 | 1004 | // remember old position [SR, GSI 18.02.2003] |
1005 | Double_t oldX=0., oldY=0., oldZ=0.; | |
1006 | if (t->IsStartedTimeIntegral() && step==1) { | |
1007 | t->GetGlobalXYZat(t->GetX(),oldX,oldY,oldZ); | |
1008 | } | |
1009 | // | |
1010 | ||
4ab260d6 | 1011 | Double_t x,y,z; |
1012 | if (!t->GetGlobalXYZat(r,x,y,z)) { | |
1013 | return kFALSE; | |
1014 | } | |
1015 | Double_t phi=TMath::ATan2(y,x); | |
1016 | Int_t idet=layer.FindDetectorIndex(phi,z); | |
1017 | if (idet<0) { | |
1018 | return kFALSE; | |
1019 | } | |
1020 | const AliITSdetector &det=layer.GetDetector(idet); | |
1021 | phi=det.GetPhi(); | |
1022 | if (!t->Propagate(phi,det.GetR())) { | |
1023 | return kFALSE; | |
1024 | } | |
1025 | t->SetDetectorIndex(idet); | |
1026 | ||
00a7cc50 | 1027 | const AliITSRecPoint *cl=0; |
4ab260d6 | 1028 | Double_t maxchi2=kMaxChi2; |
1029 | ||
1030 | Int_t idx=index[i]; | |
1031 | if (idx>0) { | |
00a7cc50 | 1032 | const AliITSRecPoint *c=(AliITSRecPoint *)GetCluster(idx); |
4ab260d6 | 1033 | if (idet != c->GetDetectorIndex()) { |
1034 | idet=c->GetDetectorIndex(); | |
1035 | const AliITSdetector &det=layer.GetDetector(idet); | |
1036 | if (!t->Propagate(det.GetPhi(),det.GetR())) { | |
1037 | return kFALSE; | |
1038 | } | |
1039 | t->SetDetectorIndex(idet); | |
1040 | } | |
1041 | Double_t chi2=t->GetPredictedChi2(c); | |
c630aafd | 1042 | if (chi2<maxchi2) { |
1043 | cl=c; | |
1044 | maxchi2=chi2; | |
1045 | } else { | |
1046 | return kFALSE; | |
1047 | } | |
4ab260d6 | 1048 | } |
ef7253ac | 1049 | |
4ab260d6 | 1050 | if (cl) { |
1051 | if (!t->Update(cl,maxchi2,idx)) { | |
1052 | return kFALSE; | |
1053 | } | |
880f41b9 | 1054 | t->SetSampledEdx(cl->GetQ(),t->GetNumberOfClusters()-1); |
4ab260d6 | 1055 | } |
1056 | ||
1057 | { | |
61ab8ea8 | 1058 | Double_t x0; |
1059 | Double_t d=layer.GetThickness(t->GetY(),t->GetZ(),x0); | |
1060 | t->CorrectForMaterial(-step*d,x0); | |
4ab260d6 | 1061 | } |
880f41b9 | 1062 | |
ef7253ac | 1063 | if (extra) { //search for extra clusters |
1064 | AliITStrackV2 tmp(*t); | |
1065 | Double_t dz=4*TMath::Sqrt(tmp.GetSigmaZ2()+kSigmaZ2[i]); | |
1066 | if (dz < 0.5*TMath::Abs(tmp.GetTgl())) dz=0.5*TMath::Abs(tmp.GetTgl()); | |
1067 | Double_t dy=4*TMath::Sqrt(t->GetSigmaY2()+kSigmaY2[i]); | |
1068 | if (dy < 0.5*TMath::Abs(tmp.GetSnp())) dy=0.5*TMath::Abs(tmp.GetSnp()); | |
1069 | Double_t zmin=t->GetZ() - dz; | |
1070 | Double_t zmax=t->GetZ() + dz; | |
1071 | Double_t ymin=t->GetY() + phi*r - dy; | |
1072 | Double_t ymax=t->GetY() + phi*r + dy; | |
1073 | layer.SelectClusters(zmin,zmax,ymin,ymax); | |
1074 | ||
1075 | const AliITSRecPoint *c=0; Int_t ci=-1,cci=-1; | |
1076 | Double_t maxchi2=1000.*kMaxChi2, tolerance=0.1; | |
1077 | while ((c=layer.GetNextCluster(ci))!=0) { | |
1078 | if (idet == c->GetDetectorIndex()) continue; | |
1079 | ||
1080 | const AliITSdetector &det=layer.GetDetector(c->GetDetectorIndex()); | |
1081 | ||
1082 | if (!tmp.Propagate(det.GetPhi(),det.GetR())) continue; | |
1083 | ||
1084 | if (TMath::Abs(tmp.GetZ() - c->GetZ()) > tolerance) continue; | |
1085 | if (TMath::Abs(tmp.GetY() - c->GetY()) > tolerance) continue; | |
1086 | ||
1087 | Double_t chi2=tmp.GetPredictedChi2(c); | |
1088 | if (chi2<maxchi2) { maxchi2=chi2; cci=ci; } | |
1089 | } | |
1090 | if (cci>=0) t->SetExtraCluster(i,(i<<28)+cci); | |
1091 | } | |
1092 | ||
880f41b9 | 1093 | // track time update [SR, GSI 17.02.2003] |
1094 | if (t->IsStartedTimeIntegral() && step==1) { | |
1095 | Double_t newX, newY, newZ; | |
1096 | t->GetGlobalXYZat(t->GetX(),newX,newY,newZ); | |
1097 | Double_t dL2 = (oldX-newX)*(oldX-newX) + (oldY-newY)*(oldY-newY) + | |
1098 | (oldZ-newZ)*(oldZ-newZ); | |
1099 | t->AddTimeStep(TMath::Sqrt(dL2)); | |
1100 | } | |
1101 | // | |
4ab260d6 | 1102 | |
1103 | } | |
1104 | ||
ee34184f | 1105 | if (!t->PropagateTo(xx,0.,0.)) return kFALSE; |
4ab260d6 | 1106 | return kTRUE; |
1107 | } | |
1108 | ||
b87bd7cd | 1109 | void AliITStrackerV2::UseClusters(const AliKalmanTrack *t, Int_t from) const { |
1110 | //-------------------------------------------------------------------- | |
1111 | // This function marks clusters assigned to the track | |
1112 | //-------------------------------------------------------------------- | |
1113 | AliTracker::UseClusters(t,from); | |
880f41b9 | 1114 | |
5482d29d | 1115 | Int_t clusterIndex = t->GetClusterIndex(0); |
1116 | AliITSRecPoint *c= 0x0; | |
1117 | ||
1118 | if (clusterIndex>-1) | |
1119 | c = (AliITSRecPoint *)GetCluster(clusterIndex); | |
d920bdee | 1120 | if (c && c->GetSigmaZ2()>0.1) c->UnUse(); |
5482d29d | 1121 | |
1122 | c = 0x0; | |
1123 | clusterIndex = t->GetClusterIndex(1); | |
1124 | if (clusterIndex>-1) | |
1125 | c=(AliITSRecPoint *)GetCluster(clusterIndex); | |
d920bdee | 1126 | if (c && c->GetSigmaZ2()>0.1) c->UnUse(); |
880f41b9 | 1127 | |
b87bd7cd | 1128 | } |