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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 | |
18856a77 | 18 | // It reads AliITSclusterV2 clusters and creates AliITStrackV2 tracks |
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" |
006b5f7f | 33 | #include "AliITSclusterV2.h" |
34 | #include "AliITStrackerV2.h" | |
35 | ||
8676d691 | 36 | ClassImp(AliITStrackerV2) |
006b5f7f | 37 | |
18856a77 | 38 | AliITStrackerV2::AliITSlayer AliITStrackerV2::fgLayers[kMaxLayer]; // ITS layers |
006b5f7f | 39 | |
c630aafd | 40 | AliITStrackerV2::AliITStrackerV2(const AliITSgeom *geom) : AliTracker() { |
006b5f7f | 41 | //-------------------------------------------------------------------- |
61ab8ea8 | 42 | //This is the AliITStrackerV2 constructor |
006b5f7f | 43 | //-------------------------------------------------------------------- |
006b5f7f | 44 | AliITSgeom *g=(AliITSgeom*)geom; |
45 | ||
46 | Float_t x,y,z; | |
47 | Int_t i; | |
c630aafd | 48 | for (i=1; i<kMaxLayer+1; i++) { |
006b5f7f | 49 | Int_t nlad=g->GetNladders(i); |
50 | Int_t ndet=g->GetNdetectors(i); | |
51 | ||
52 | g->GetTrans(i,1,1,x,y,z); | |
53 | Double_t r=TMath::Sqrt(x*x + y*y); | |
54 | Double_t poff=TMath::ATan2(y,x); | |
55 | Double_t zoff=z; | |
56 | ||
57 | g->GetTrans(i,1,2,x,y,z); | |
58 | r += TMath::Sqrt(x*x + y*y); | |
59 | g->GetTrans(i,2,1,x,y,z); | |
60 | r += TMath::Sqrt(x*x + y*y); | |
61 | g->GetTrans(i,2,2,x,y,z); | |
62 | r += TMath::Sqrt(x*x + y*y); | |
63 | r*=0.25; | |
64 | ||
18856a77 | 65 | new (fgLayers+i-1) AliITSlayer(r,poff,zoff,nlad,ndet); |
006b5f7f | 66 | |
67 | for (Int_t j=1; j<nlad+1; j++) { | |
68 | for (Int_t k=1; k<ndet+1; k++) { //Fill this layer with detectors | |
69 | Float_t x,y,zshift; g->GetTrans(i,j,k,x,y,zshift); | |
70 | Double_t rot[9]; g->GetRotMatrix(i,j,k,rot); | |
71 | ||
f363d377 | 72 | Double_t phi=TMath::ATan2(rot[1],rot[0])+TMath::Pi(); |
73 | phi+=TMath::Pi()/2; | |
74 | if (i==1) phi+=TMath::Pi(); | |
75 | Double_t cp=TMath::Cos(phi), sp=TMath::Sin(phi); | |
76 | Double_t r=x*cp+y*sp; | |
006b5f7f | 77 | |
18856a77 | 78 | AliITSdetector &det=fgLayers[i-1].GetDetector((j-1)*ndet + k-1); |
006b5f7f | 79 | new(&det) AliITSdetector(r,phi); |
80 | } | |
81 | } | |
c630aafd | 82 | |
006b5f7f | 83 | } |
84 | ||
61ab8ea8 | 85 | fI=kMaxLayer; |
743a19f2 | 86 | |
61ab8ea8 | 87 | fPass=0; |
15dd636f | 88 | fConstraint[0]=1; fConstraint[1]=0;//-1; |
8676d691 | 89 | |
90 | Double_t xyz[]={kXV,kYV,kZV}, ers[]={kSigmaXV,kSigmaYV,kSigmaZV}; | |
91 | SetVertex(xyz,ers); | |
c0dd5278 | 92 | |
93 | for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=kLayersNotToSkip[i]; | |
94 | fLastLayerToTrackTo=kLastLayerToTrackTo; | |
95 | ||
96 | } | |
97 | ||
98 | void AliITStrackerV2::SetLayersNotToSkip(Int_t *l) { | |
99 | //-------------------------------------------------------------------- | |
100 | //This function set masks of the layers which must be not skipped | |
101 | //-------------------------------------------------------------------- | |
102 | for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=l[i]; | |
61ab8ea8 | 103 | } |
006b5f7f | 104 | |
c630aafd | 105 | Int_t AliITStrackerV2::LoadClusters(TTree *cTree) { |
61ab8ea8 | 106 | //-------------------------------------------------------------------- |
107 | //This function loads ITS clusters | |
108 | //-------------------------------------------------------------------- | |
61ab8ea8 | 109 | TBranch *branch=cTree->GetBranch("Clusters"); |
110 | if (!branch) { | |
c630aafd | 111 | Error("LoadClusters"," can't get the branch !\n"); |
8676d691 | 112 | return 1; |
61ab8ea8 | 113 | } |
006b5f7f | 114 | |
61ab8ea8 | 115 | TClonesArray dummy("AliITSclusterV2",10000), *clusters=&dummy; |
116 | branch->SetAddress(&clusters); | |
006b5f7f | 117 | |
61ab8ea8 | 118 | Int_t j=0; |
119 | for (Int_t i=0; i<kMaxLayer; i++) { | |
18856a77 | 120 | Int_t ndet=fgLayers[i].GetNdetectors(); |
121 | Int_t jmax = j + fgLayers[i].GetNladders()*ndet; | |
61ab8ea8 | 122 | for (; j<jmax; j++) { |
123 | if (!cTree->GetEvent(j)) continue; | |
124 | Int_t ncl=clusters->GetEntriesFast(); | |
125 | while (ncl--) { | |
126 | AliITSclusterV2 *c=(AliITSclusterV2*)clusters->UncheckedAt(ncl); | |
18856a77 | 127 | fgLayers[i].InsertCluster(new AliITSclusterV2(*c)); |
61ab8ea8 | 128 | } |
129 | clusters->Delete(); | |
130 | } | |
18856a77 | 131 | fgLayers[i].ResetRoad(); //road defined by the cluster density |
006b5f7f | 132 | } |
c630aafd | 133 | |
8676d691 | 134 | return 0; |
61ab8ea8 | 135 | } |
006b5f7f | 136 | |
61ab8ea8 | 137 | void AliITStrackerV2::UnloadClusters() { |
138 | //-------------------------------------------------------------------- | |
139 | //This function unloads ITS clusters | |
140 | //-------------------------------------------------------------------- | |
18856a77 | 141 | for (Int_t i=0; i<kMaxLayer; i++) fgLayers[i].ResetClusters(); |
006b5f7f | 142 | } |
143 | ||
880f41b9 | 144 | static Int_t CorrectForDeadZoneMaterial(AliITStrackV2 *t) { |
145 | //-------------------------------------------------------------------- | |
146 | // Correction for the material between the TPC and the ITS | |
147 | // (should it belong to the TPC code ?) | |
148 | //-------------------------------------------------------------------- | |
149 | Double_t riw=80., diw=0.0053, x0iw=30; // TPC inner wall ? | |
150 | Double_t rcd=61., dcd=0.0053, x0cd=30; // TPC "central drum" ? | |
151 | Double_t yr=12.8, dr=0.03; // rods ? | |
152 | Double_t zm=0.2, dm=0.40; // membrane | |
153 | //Double_t rr=52., dr=0.19, x0r=24., yyr=7.77; //rails | |
154 | Double_t rs=50., ds=0.001; // something belonging to the ITS (screen ?) | |
155 | ||
156 | if (t->GetX() > riw) { | |
157 | if (!t->PropagateTo(riw,diw,x0iw)) return 1; | |
158 | if (TMath::Abs(t->GetY())>yr) t->CorrectForMaterial(dr); | |
159 | if (TMath::Abs(t->GetZ())<zm) t->CorrectForMaterial(dm); | |
160 | if (!t->PropagateTo(rcd,dcd,x0cd)) return 1; | |
161 | //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z); | |
162 | //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,dr,x0r); | |
163 | if (!t->PropagateTo(rs,ds)) return 1; | |
164 | } else if (t->GetX() < rs) { | |
165 | if (!t->PropagateTo(rs,-ds)) return 1; | |
166 | //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z); | |
167 | //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,-dr,x0r); | |
168 | if (!t->PropagateTo(rcd,-dcd,x0cd)) return 1; | |
ba1a3e1a | 169 | if (!t->PropagateTo(riw+0.001,-diw,x0iw)) return 1; |
880f41b9 | 170 | } else { |
171 | ::Error("CorrectForDeadZoneMaterial","track is already in the dead zone !"); | |
172 | return 1; | |
173 | } | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
c630aafd | 178 | Int_t AliITStrackerV2::Clusters2Tracks(AliESD *event) { |
006b5f7f | 179 | //-------------------------------------------------------------------- |
c630aafd | 180 | // This functions reconstructs ITS tracks |
181 | // The clusters must be already loaded ! | |
006b5f7f | 182 | //-------------------------------------------------------------------- |
c630aafd | 183 | TObjArray itsTracks(15000); |
006b5f7f | 184 | |
c630aafd | 185 | {/* Read ESD tracks */ |
186 | Int_t nentr=event->GetNumberOfTracks(); | |
187 | Info("Clusters2Tracks", "Number of ESD tracks: %d\n", nentr); | |
188 | while (nentr--) { | |
189 | AliESDtrack *esd=event->GetTrack(nentr); | |
190 | ||
ba1a3e1a | 191 | if ((esd->GetStatus()&AliESDtrack::kTPCin)==0) continue; |
192 | if (esd->GetStatus()&AliESDtrack::kTPCout) continue; | |
193 | if (esd->GetStatus()&AliESDtrack::kITSin) continue; | |
c630aafd | 194 | |
195 | AliITStrackV2 *t=0; | |
196 | try { | |
197 | t=new AliITStrackV2(*esd); | |
198 | } catch (const Char_t *msg) { | |
199 | Warning("Clusters2Tracks",msg); | |
200 | delete t; | |
201 | continue; | |
202 | } | |
15dd636f | 203 | if (TMath::Abs(t->GetD())>4) { |
ebd8369c | 204 | delete t; |
205 | continue; | |
206 | } | |
006b5f7f | 207 | |
c630aafd | 208 | if (CorrectForDeadZoneMaterial(t)!=0) { |
209 | Warning("Clusters2Tracks", | |
210 | "failed to correct for the material in the dead zone !\n"); | |
211 | delete t; | |
212 | continue; | |
213 | } | |
214 | itsTracks.AddLast(t); | |
215 | } | |
216 | } /* End Read ESD tracks */ | |
217 | ||
218 | itsTracks.Sort(); | |
219 | Int_t nentr=itsTracks.GetEntriesFast(); | |
15dd636f | 220 | |
c630aafd | 221 | Int_t ntrk=0; |
222 | for (fPass=0; fPass<2; fPass++) { | |
223 | Int_t &constraint=fConstraint[fPass]; if (constraint<0) continue; | |
224 | for (Int_t i=0; i<nentr; i++) { | |
225 | AliITStrackV2 *t=(AliITStrackV2*)itsTracks.UncheckedAt(i); | |
15dd636f | 226 | if (t==0) continue; //this track has been already tracked |
c630aafd | 227 | Int_t tpcLabel=t->GetLabel(); //save the TPC track label |
228 | ||
229 | ResetTrackToFollow(*t); | |
230 | ResetBestTrack(); | |
231 | ||
232 | for (FollowProlongation(); fI<kMaxLayer; fI++) { | |
15dd636f | 233 | while (TakeNextProlongation()) FollowProlongation(); |
c630aafd | 234 | } |
235 | ||
de5d3595 | 236 | if (fBestTrack.GetNumberOfClusters() == 0) continue; |
15dd636f | 237 | |
c630aafd | 238 | if (fConstraint[fPass]) { |
15dd636f | 239 | ResetTrackToFollow(*t); |
240 | if (!RefitAt(3.7, &fTrackToFollow, &fBestTrack)) continue; | |
241 | ResetBestTrack(); | |
242 | } | |
243 | ||
c630aafd | 244 | fBestTrack.SetLabel(tpcLabel); |
245 | fBestTrack.CookdEdx(); | |
246 | CookLabel(&fBestTrack,0.); //For comparison only | |
247 | fBestTrack.UpdateESDtrack(AliESDtrack::kITSin); | |
15dd636f | 248 | UseClusters(&fBestTrack); |
c630aafd | 249 | delete itsTracks.RemoveAt(i); |
250 | ntrk++; | |
251 | } | |
252 | } | |
babd135a | 253 | |
c630aafd | 254 | itsTracks.Delete(); |
2257f27e | 255 | |
c630aafd | 256 | Info("Clusters2Tracks","Number of prolonged tracks: %d\n",ntrk); |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
c630aafd | 261 | Int_t AliITStrackerV2::PropagateBack(AliESD *event) { |
262 | //-------------------------------------------------------------------- | |
263 | // This functions propagates reconstructed ITS tracks back | |
264 | // The clusters must be loaded ! | |
265 | //-------------------------------------------------------------------- | |
266 | Int_t nentr=event->GetNumberOfTracks(); | |
267 | Info("PropagateBack", "Number of ESD tracks: %d\n", nentr); | |
268 | ||
269 | Int_t ntrk=0; | |
270 | for (Int_t i=0; i<nentr; i++) { | |
271 | AliESDtrack *esd=event->GetTrack(i); | |
272 | ||
ba1a3e1a | 273 | if ((esd->GetStatus()&AliESDtrack::kITSin)==0) continue; |
274 | if (esd->GetStatus()&AliESDtrack::kITSout) continue; | |
c630aafd | 275 | |
276 | AliITStrackV2 *t=0; | |
277 | try { | |
278 | t=new AliITStrackV2(*esd); | |
279 | } catch (const Char_t *msg) { | |
280 | Warning("PropagateBack",msg); | |
281 | delete t; | |
282 | continue; | |
283 | } | |
284 | ||
285 | ResetTrackToFollow(*t); | |
286 | ||
287 | // propagete to vertex [SR, GSI 17.02.2003] | |
a9459f9c | 288 | // Start Time measurement [SR, GSI 17.02.2003], corrected by I.Belikov |
289 | if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) { | |
290 | if (fTrackToFollow.PropagateToVertex()) { | |
291 | fTrackToFollow.StartTimeIntegral(); | |
292 | } | |
293 | fTrackToFollow.PropagateTo(3.,-0.0028,65.19); | |
294 | } | |
c630aafd | 295 | |
296 | fTrackToFollow.ResetCovariance(); fTrackToFollow.ResetClusters(); | |
297 | if (RefitAt(49.,&fTrackToFollow,t)) { | |
298 | if (CorrectForDeadZoneMaterial(&fTrackToFollow)!=0) { | |
299 | Warning("PropagateBack", | |
300 | "failed to correct for the material in the dead zone !\n"); | |
301 | delete t; | |
302 | continue; | |
303 | } | |
304 | fTrackToFollow.SetLabel(t->GetLabel()); | |
ba1a3e1a | 305 | //fTrackToFollow.CookdEdx(); |
c630aafd | 306 | CookLabel(&fTrackToFollow,0.); //For comparison only |
307 | fTrackToFollow.UpdateESDtrack(AliESDtrack::kITSout); | |
15dd636f | 308 | UseClusters(&fTrackToFollow); |
c630aafd | 309 | ntrk++; |
310 | } | |
311 | delete t; | |
312 | } | |
313 | ||
314 | Info("PropagateBack","Number of back propagated ITS tracks: %d\n",ntrk); | |
61ab8ea8 | 315 | |
83d73500 | 316 | return 0; |
317 | } | |
318 | ||
c630aafd | 319 | Int_t AliITStrackerV2::RefitInward(AliESD *event) { |
83d73500 | 320 | //-------------------------------------------------------------------- |
321 | // This functions refits ITS tracks using the | |
322 | // "inward propagated" TPC tracks | |
c630aafd | 323 | // The clusters must be loaded ! |
83d73500 | 324 | //-------------------------------------------------------------------- |
c630aafd | 325 | Int_t nentr=event->GetNumberOfTracks(); |
326 | Info("RefitInward", "Number of ESD tracks: %d\n", nentr); | |
327 | ||
328 | Int_t ntrk=0; | |
329 | for (Int_t i=0; i<nentr; i++) { | |
330 | AliESDtrack *esd=event->GetTrack(i); | |
331 | ||
ba1a3e1a | 332 | if ((esd->GetStatus()&AliESDtrack::kITSout) == 0) continue; |
333 | if (esd->GetStatus()&AliESDtrack::kITSrefit) continue; | |
334 | if (esd->GetStatus()&AliESDtrack::kTPCout) | |
15dd636f | 335 | if ((esd->GetStatus()&AliESDtrack::kTPCrefit)==0) continue; |
c630aafd | 336 | |
337 | AliITStrackV2 *t=0; | |
338 | try { | |
339 | t=new AliITStrackV2(*esd); | |
340 | } catch (const Char_t *msg) { | |
341 | Warning("RefitInward",msg); | |
342 | delete t; | |
343 | continue; | |
344 | } | |
345 | ||
346 | if (CorrectForDeadZoneMaterial(t)!=0) { | |
347 | Warning("RefitInward", | |
348 | "failed to correct for the material in the dead zone !\n"); | |
349 | delete t; | |
350 | continue; | |
351 | } | |
352 | ||
353 | ResetTrackToFollow(*t); | |
354 | fTrackToFollow.ResetClusters(); | |
355 | ||
356 | //Refitting... | |
357 | if (RefitAt(3.7, &fTrackToFollow, t)) { | |
358 | fTrackToFollow.SetLabel(t->GetLabel()); | |
359 | fTrackToFollow.CookdEdx(); | |
15dd636f | 360 | CookLabel(&fTrackToFollow,0.); //For comparison only |
18856a77 | 361 | |
67c3dcbe | 362 | if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) {//The beam pipe |
363 | Double_t a=fTrackToFollow.GetAlpha(); | |
364 | Double_t cs=TMath::Cos(a),sn=TMath::Sin(a); | |
365 | Double_t xv= GetX()*cs + GetY()*sn; | |
366 | Double_t yv=-GetX()*sn + GetY()*cs; | |
367 | ||
368 | Double_t c=fTrackToFollow.GetC(), snp=fTrackToFollow.GetSnp(); | |
369 | Double_t x=fTrackToFollow.GetX(), y=fTrackToFollow.GetY(); | |
370 | Double_t tgfv=-(c*(x-xv)-snp)/(c*(y-yv) + TMath::Sqrt(1.-snp*snp)); | |
371 | Double_t fv=TMath::ATan(tgfv); | |
372 | ||
373 | cs=TMath::Cos(fv); sn=TMath::Sin(fv); | |
374 | x = xv*cs + yv*sn; | |
375 | yv=-xv*sn + yv*cs; xv=x; | |
376 | ||
377 | if (fTrackToFollow.Propagate(fv+a,xv)) { | |
df02fd67 | 378 | fTrackToFollow.UpdateESDtrack(AliESDtrack::kITSrefit); |
399fb957 | 379 | Float_t d=fTrackToFollow.GetD(GetX(),GetY()); |
380 | Float_t z=fTrackToFollow.GetZ()-GetZ(); | |
381 | fTrackToFollow.GetESDtrack()->SetImpactParameters(d,z); | |
15dd636f | 382 | UseClusters(&fTrackToFollow); |
67c3dcbe | 383 | { |
384 | AliITSclusterV2 c; c.SetY(yv); c.SetZ(GetZ()); | |
385 | c.SetSigmaY2(GetSigmaY()*GetSigmaY()); | |
386 | c.SetSigmaZ2(GetSigmaZ()*GetSigmaZ()); | |
387 | Double_t chi2=fTrackToFollow.GetPredictedChi2(&c); | |
388 | if (chi2<kMaxChi2) | |
389 | if (fTrackToFollow.Update(&c,-chi2,0)) | |
390 | fTrackToFollow.SetConstrainedESDtrack(chi2); | |
391 | } | |
df02fd67 | 392 | ntrk++; |
393 | } | |
67c3dcbe | 394 | } |
c630aafd | 395 | } |
396 | delete t; | |
397 | } | |
398 | ||
399 | Info("RefitInward","Number of refitted tracks: %d\n",ntrk); | |
83d73500 | 400 | |
c630aafd | 401 | return 0; |
402 | } | |
83d73500 | 403 | |
006b5f7f | 404 | AliCluster *AliITStrackerV2::GetCluster(Int_t index) const { |
405 | //-------------------------------------------------------------------- | |
406 | // Return pointer to a given cluster | |
407 | //-------------------------------------------------------------------- | |
408 | Int_t l=(index & 0xf0000000) >> 28; | |
409 | Int_t c=(index & 0x0fffffff) >> 00; | |
18856a77 | 410 | return fgLayers[l].GetCluster(c); |
006b5f7f | 411 | } |
412 | ||
413 | ||
414 | void AliITStrackerV2::FollowProlongation() { | |
415 | //-------------------------------------------------------------------- | |
416 | //This function finds a track prolongation | |
417 | //-------------------------------------------------------------------- | |
c0dd5278 | 418 | while (fI>fLastLayerToTrackTo) { |
a9a2d814 | 419 | Int_t i=fI-1; |
8676d691 | 420 | |
18856a77 | 421 | AliITSlayer &layer=fgLayers[i]; |
a9a2d814 | 422 | AliITStrackV2 &track=fTracks[i]; |
006b5f7f | 423 | |
14825d5a | 424 | Double_t r=layer.GetR(); |
61ab8ea8 | 425 | |
a9a2d814 | 426 | if (i==3 || i==1) { |
18856a77 | 427 | Double_t rs=0.5*(fgLayers[i+1].GetR() + r); |
61ab8ea8 | 428 | Double_t d=0.0034, x0=38.6; |
429 | if (i==1) {rs=9.; d=0.0097; x0=42;} | |
430 | if (!fTrackToFollow.PropagateTo(rs,d,x0)) { | |
8676d691 | 431 | //Warning("FollowProlongation","propagation failed !\n"); |
c0dd5278 | 432 | return; |
a9a2d814 | 433 | } |
006b5f7f | 434 | } |
435 | ||
436 | //find intersection | |
437 | Double_t x,y,z; | |
14825d5a | 438 | if (!fTrackToFollow.GetGlobalXYZat(r,x,y,z)) { |
8676d691 | 439 | //Warning("FollowProlongation","failed to estimate track !\n"); |
c0dd5278 | 440 | return; |
006b5f7f | 441 | } |
442 | Double_t phi=TMath::ATan2(y,x); | |
f363d377 | 443 | |
006b5f7f | 444 | Int_t idet=layer.FindDetectorIndex(phi,z); |
445 | if (idet<0) { | |
8676d691 | 446 | //Warning("FollowProlongation","failed to find a detector !\n"); |
c0dd5278 | 447 | return; |
006b5f7f | 448 | } |
449 | ||
450 | //propagate to the intersection | |
451 | const AliITSdetector &det=layer.GetDetector(idet); | |
14825d5a | 452 | phi=det.GetPhi(); |
a9a2d814 | 453 | if (!fTrackToFollow.Propagate(phi,det.GetR())) { |
8676d691 | 454 | //Warning("FollowProlongation","propagation failed !\n"); |
c0dd5278 | 455 | return; |
006b5f7f | 456 | } |
457 | fTrackToFollow.SetDetectorIndex(idet); | |
458 | ||
459 | //Select possible prolongations and store the current track estimation | |
460 | track.~AliITStrackV2(); new(&track) AliITStrackV2(fTrackToFollow); | |
8676d691 | 461 | Double_t dz=7*TMath::Sqrt(track.GetSigmaZ2() + kSigmaZ2[i]); |
462 | Double_t dy=7*TMath::Sqrt(track.GetSigmaY2() + kSigmaY2[i]); | |
463 | Double_t road=layer.GetRoad(); | |
464 | if (dz*dy>road*road) { | |
465 | Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd; | |
466 | dz=road*scz; dy=road*scy; | |
467 | } | |
b87bd7cd | 468 | |
469 | //Double_t dz=4*TMath::Sqrt(track.GetSigmaZ2() + kSigmaZ2[i]); | |
14825d5a | 470 | if (dz < 0.5*TMath::Abs(track.GetTgl())) dz=0.5*TMath::Abs(track.GetTgl()); |
7f6ddf58 | 471 | if (dz > kMaxRoad) { |
8676d691 | 472 | //Warning("FollowProlongation","too broad road in Z !\n"); |
c0dd5278 | 473 | return; |
006b5f7f | 474 | } |
a9a2d814 | 475 | |
15dd636f | 476 | if (TMath::Abs(fTrackToFollow.GetZ()-GetZ()) > r+dz) return; |
a9a2d814 | 477 | |
b87bd7cd | 478 | //Double_t dy=4*TMath::Sqrt(track.GetSigmaY2() + kSigmaY2[i]); |
14825d5a | 479 | if (dy < 0.5*TMath::Abs(track.GetSnp())) dy=0.5*TMath::Abs(track.GetSnp()); |
7f6ddf58 | 480 | if (dy > kMaxRoad) { |
8676d691 | 481 | //Warning("FollowProlongation","too broad road in Y !\n"); |
c0dd5278 | 482 | return; |
006b5f7f | 483 | } |
a9a2d814 | 484 | |
7f6ddf58 | 485 | Double_t zmin=track.GetZ() - dz; |
006b5f7f | 486 | Double_t zmax=track.GetZ() + dz; |
14825d5a | 487 | Double_t ymin=track.GetY() + r*phi - dy; |
488 | Double_t ymax=track.GetY() + r*phi + dy; | |
a9a2d814 | 489 | layer.SelectClusters(zmin,zmax,ymin,ymax); |
490 | fI--; | |
006b5f7f | 491 | |
006b5f7f | 492 | //take another prolongation |
15dd636f | 493 | if (!TakeNextProlongation()) |
494 | if (fLayersNotToSkip[fI]) return; | |
495 | ||
006b5f7f | 496 | } |
497 | ||
498 | //deal with the best track | |
499 | Int_t ncl=fTrackToFollow.GetNumberOfClusters(); | |
500 | Int_t nclb=fBestTrack.GetNumberOfClusters(); | |
15dd636f | 501 | if (ncl) |
502 | if (ncl >= nclb) { | |
503 | Double_t chi2=fTrackToFollow.GetChi2(); | |
504 | if (chi2/ncl < kChi2PerCluster) { | |
505 | if (ncl > nclb || chi2 < fBestTrack.GetChi2()) { | |
506 | ResetBestTrack(); | |
006b5f7f | 507 | } |
15dd636f | 508 | } |
006b5f7f | 509 | } |
15dd636f | 510 | |
006b5f7f | 511 | } |
512 | ||
006b5f7f | 513 | Int_t AliITStrackerV2::TakeNextProlongation() { |
514 | //-------------------------------------------------------------------- | |
a9a2d814 | 515 | // This function takes another track prolongation |
516 | // | |
517 | // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch | |
006b5f7f | 518 | //-------------------------------------------------------------------- |
18856a77 | 519 | AliITSlayer &layer=fgLayers[fI]; |
4ab260d6 | 520 | ResetTrackToFollow(fTracks[fI]); |
006b5f7f | 521 | |
b87bd7cd | 522 | Double_t dz=7*TMath::Sqrt(fTrackToFollow.GetSigmaZ2() + kSigmaZ2[fI]); |
523 | Double_t dy=7*TMath::Sqrt(fTrackToFollow.GetSigmaY2() + kSigmaY2[fI]); | |
8676d691 | 524 | Double_t road=layer.GetRoad(); |
525 | if (dz*dy>road*road) { | |
526 | Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd; | |
527 | dz=road*scz; dy=road*scy; | |
528 | } | |
006b5f7f | 529 | |
530 | const AliITSclusterV2 *c=0; Int_t ci=-1; | |
531 | Double_t chi2=12345.; | |
532 | while ((c=layer.GetNextCluster(ci))!=0) { | |
006b5f7f | 533 | Int_t idet=c->GetDetectorIndex(); |
15dd636f | 534 | |
4ab260d6 | 535 | if (fTrackToFollow.GetDetectorIndex()!=idet) { |
006b5f7f | 536 | const AliITSdetector &det=layer.GetDetector(idet); |
4ab260d6 | 537 | ResetTrackToFollow(fTracks[fI]); |
538 | if (!fTrackToFollow.Propagate(det.GetPhi(),det.GetR())) { | |
8676d691 | 539 | //Warning("TakeNextProlongation","propagation failed !\n"); |
006b5f7f | 540 | continue; |
541 | } | |
4ab260d6 | 542 | fTrackToFollow.SetDetectorIndex(idet); |
543 | if (TMath::Abs(fTrackToFollow.GetZ()-GetZ())>layer.GetR()+dz) continue; | |
006b5f7f | 544 | } |
545 | ||
4ab260d6 | 546 | if (TMath::Abs(fTrackToFollow.GetZ() - c->GetZ()) > dz) continue; |
547 | if (TMath::Abs(fTrackToFollow.GetY() - c->GetY()) > dy) continue; | |
006b5f7f | 548 | |
4ab260d6 | 549 | chi2=fTrackToFollow.GetPredictedChi2(c); if (chi2<kMaxChi2) break; |
006b5f7f | 550 | } |
551 | ||
006b5f7f | 552 | if (chi2>=kMaxChi2) return 0; |
553 | if (!c) return 0; | |
554 | ||
006b5f7f | 555 | if (!fTrackToFollow.Update(c,chi2,(fI<<28)+ci)) { |
8676d691 | 556 | //Warning("TakeNextProlongation","filtering failed !\n"); |
006b5f7f | 557 | return 0; |
558 | } | |
15dd636f | 559 | |
4ab260d6 | 560 | if (fTrackToFollow.GetNumberOfClusters()>1) |
561 | if (TMath::Abs(fTrackToFollow.GetD())>4) return 0; | |
562 | ||
a9a2d814 | 563 | fTrackToFollow. |
564 | SetSampledEdx(c->GetQ(),fTrackToFollow.GetNumberOfClusters()-1); //b.b. | |
565 | ||
566 | { | |
880f41b9 | 567 | Double_t x0; |
61ab8ea8 | 568 | Double_t d=layer.GetThickness(fTrackToFollow.GetY(),fTrackToFollow.GetZ(),x0); |
880f41b9 | 569 | fTrackToFollow.CorrectForMaterial(d,x0); |
a9a2d814 | 570 | } |
4ab260d6 | 571 | |
a9a2d814 | 572 | if (fConstraint[fPass]) { |
4ab260d6 | 573 | Double_t d=GetEffectiveThickness(0,0); //Think of this !!!! |
8676d691 | 574 | Double_t xyz[]={GetX(),GetY(),GetZ()}; |
575 | Double_t ers[]={GetSigmaX(),GetSigmaY(),GetSigmaZ()}; | |
576 | fTrackToFollow.Improve(d,xyz,ers); | |
a9a2d814 | 577 | } |
006b5f7f | 578 | |
006b5f7f | 579 | return 1; |
580 | } | |
581 | ||
582 | ||
006b5f7f | 583 | AliITStrackerV2::AliITSlayer::AliITSlayer() { |
584 | //-------------------------------------------------------------------- | |
585 | //default AliITSlayer constructor | |
586 | //-------------------------------------------------------------------- | |
587 | fN=0; | |
588 | fDetectors=0; | |
589 | } | |
590 | ||
591 | AliITStrackerV2::AliITSlayer:: | |
592 | AliITSlayer(Double_t r,Double_t p,Double_t z,Int_t nl,Int_t nd) { | |
593 | //-------------------------------------------------------------------- | |
594 | //main AliITSlayer constructor | |
595 | //-------------------------------------------------------------------- | |
596 | fR=r; fPhiOffset=p; fZOffset=z; | |
597 | fNladders=nl; fNdetectors=nd; | |
598 | fDetectors=new AliITSdetector[fNladders*fNdetectors]; | |
599 | ||
600 | fN=0; | |
601 | fI=0; | |
b87bd7cd | 602 | |
603 | fRoad=2*fR*TMath::Sqrt(3.14/1.);//assuming that there's only one cluster | |
006b5f7f | 604 | } |
605 | ||
606 | AliITStrackerV2::AliITSlayer::~AliITSlayer() { | |
607 | //-------------------------------------------------------------------- | |
608 | // AliITSlayer destructor | |
609 | //-------------------------------------------------------------------- | |
610 | delete[] fDetectors; | |
611 | for (Int_t i=0; i<fN; i++) delete fClusters[i]; | |
612 | } | |
613 | ||
61ab8ea8 | 614 | void AliITStrackerV2::AliITSlayer::ResetClusters() { |
615 | //-------------------------------------------------------------------- | |
616 | // This function removes loaded clusters | |
617 | //-------------------------------------------------------------------- | |
618 | for (Int_t i=0; i<fN; i++) delete fClusters[i]; | |
619 | fN=0; | |
620 | fI=0; | |
621 | } | |
622 | ||
b87bd7cd | 623 | void AliITStrackerV2::AliITSlayer::ResetRoad() { |
624 | //-------------------------------------------------------------------- | |
625 | // This function calculates the road defined by the cluster density | |
626 | //-------------------------------------------------------------------- | |
627 | Int_t n=0; | |
628 | for (Int_t i=0; i<fN; i++) { | |
629 | if (TMath::Abs(fClusters[i]->GetZ())<fR) n++; | |
630 | } | |
631 | if (n>1) fRoad=2*fR*TMath::Sqrt(3.14/n); | |
632 | } | |
633 | ||
006b5f7f | 634 | Int_t AliITStrackerV2::AliITSlayer::InsertCluster(AliITSclusterV2 *c) { |
635 | //-------------------------------------------------------------------- | |
636 | //This function adds a cluster to this layer | |
637 | //-------------------------------------------------------------------- | |
638 | if (fN==kMaxClusterPerLayer) { | |
8676d691 | 639 | ::Error("InsertCluster","Too many clusters !\n"); |
640 | return 1; | |
006b5f7f | 641 | } |
642 | ||
643 | if (fN==0) {fClusters[fN++]=c; return 0;} | |
644 | Int_t i=FindClusterIndex(c->GetZ()); | |
645 | memmove(fClusters+i+1 ,fClusters+i,(fN-i)*sizeof(AliITSclusterV2*)); | |
646 | fClusters[i]=c; fN++; | |
647 | ||
648 | return 0; | |
649 | } | |
650 | ||
651 | Int_t AliITStrackerV2::AliITSlayer::FindClusterIndex(Double_t z) const { | |
652 | //-------------------------------------------------------------------- | |
653 | // This function returns the index of the nearest cluster | |
654 | //-------------------------------------------------------------------- | |
655 | if (fN==0) return 0; | |
656 | if (z <= fClusters[0]->GetZ()) return 0; | |
657 | if (z > fClusters[fN-1]->GetZ()) return fN; | |
658 | Int_t b=0, e=fN-1, m=(b+e)/2; | |
659 | for (; b<e; m=(b+e)/2) { | |
660 | if (z > fClusters[m]->GetZ()) b=m+1; | |
661 | else e=m; | |
662 | } | |
663 | return m; | |
664 | } | |
665 | ||
666 | void AliITStrackerV2::AliITSlayer:: | |
667 | SelectClusters(Double_t zmin,Double_t zmax,Double_t ymin, Double_t ymax) { | |
668 | //-------------------------------------------------------------------- | |
669 | // This function sets the "window" | |
670 | //-------------------------------------------------------------------- | |
671 | fI=FindClusterIndex(zmin); fZmax=zmax; | |
14825d5a | 672 | Double_t circle=2*TMath::Pi()*fR; |
673 | if (ymax>circle) { ymax-=circle; ymin-=circle; } | |
006b5f7f | 674 | fYmin=ymin; fYmax=ymax; |
675 | } | |
676 | ||
677 | const AliITSclusterV2 *AliITStrackerV2::AliITSlayer::GetNextCluster(Int_t &ci){ | |
678 | //-------------------------------------------------------------------- | |
679 | // This function returns clusters within the "window" | |
680 | //-------------------------------------------------------------------- | |
681 | const AliITSclusterV2 *cluster=0; | |
682 | for (Int_t i=fI; i<fN; i++) { | |
683 | const AliITSclusterV2 *c=fClusters[i]; | |
684 | if (c->GetZ() > fZmax) break; | |
15dd636f | 685 | if (c->IsUsed()) continue; |
006b5f7f | 686 | const AliITSdetector &det=GetDetector(c->GetDetectorIndex()); |
687 | Double_t y=fR*det.GetPhi() + c->GetY(); | |
688 | ||
689 | if (y>2.*fR*TMath::Pi()) y -= 2*fR*TMath::Pi(); | |
690 | if (y>1.*fR*TMath::Pi() && fYmax<y) y -= 2*fR*TMath::Pi(); | |
691 | ||
692 | if (y<fYmin) continue; | |
693 | if (y>fYmax) continue; | |
694 | cluster=c; ci=i; | |
695 | fI=i+1; | |
696 | break; | |
697 | } | |
7f6ddf58 | 698 | |
006b5f7f | 699 | return cluster; |
700 | } | |
701 | ||
702 | Int_t AliITStrackerV2::AliITSlayer:: | |
703 | FindDetectorIndex(Double_t phi, Double_t z) const { | |
704 | //-------------------------------------------------------------------- | |
705 | //This function finds the detector crossed by the track | |
706 | //-------------------------------------------------------------------- | |
f363d377 | 707 | Double_t dphi=-(phi-fPhiOffset); |
006b5f7f | 708 | if (dphi < 0) dphi += 2*TMath::Pi(); |
709 | else if (dphi >= 2*TMath::Pi()) dphi -= 2*TMath::Pi(); | |
710 | Int_t np=Int_t(dphi*fNladders*0.5/TMath::Pi()+0.5); | |
3e3e8427 | 711 | if (np>=fNladders) np-=fNladders; |
712 | if (np<0) np+=fNladders; | |
006b5f7f | 713 | |
714 | Double_t dz=fZOffset-z; | |
715 | Int_t nz=Int_t(dz*(fNdetectors-1)*0.5/fZOffset+0.5); | |
3e3e8427 | 716 | if (nz>=fNdetectors) return -1; |
717 | if (nz<0) return -1; | |
006b5f7f | 718 | |
006b5f7f | 719 | return np*fNdetectors + nz; |
720 | } | |
721 | ||
722 | Double_t | |
61ab8ea8 | 723 | AliITStrackerV2::AliITSlayer::GetThickness(Double_t y,Double_t z,Double_t &x0) |
724 | const { | |
a9a2d814 | 725 | //-------------------------------------------------------------------- |
726 | //This function returns the layer thickness at this point (units X0) | |
727 | //-------------------------------------------------------------------- | |
728 | Double_t d=0.0085; | |
61ab8ea8 | 729 | x0=21.82; |
a9a2d814 | 730 | |
731 | if (43<fR&&fR<45) { //SSD2 | |
61ab8ea8 | 732 | Double_t dd=0.0034; |
733 | d=dd; | |
734 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
735 | if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);} | |
736 | if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);} | |
a9a2d814 | 737 | for (Int_t i=0; i<12; i++) { |
61ab8ea8 | 738 | if (TMath::Abs(z-3.9*(i+0.5))<0.15) { |
739 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
740 | d+=0.0034; | |
741 | break; | |
742 | } | |
743 | if (TMath::Abs(z+3.9*(i+0.5))<0.15) { | |
744 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
745 | d+=0.0034; | |
746 | break; | |
747 | } | |
748 | if (TMath::Abs(z-3.4-3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
749 | if (TMath::Abs(z+0.5+3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
a9a2d814 | 750 | } |
751 | } else | |
752 | if (37<fR&&fR<41) { //SSD1 | |
61ab8ea8 | 753 | Double_t dd=0.0034; |
754 | d=dd; | |
755 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
756 | if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);} | |
757 | if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);} | |
a9a2d814 | 758 | for (Int_t i=0; i<11; i++) { |
61ab8ea8 | 759 | if (TMath::Abs(z-3.9*i)<0.15) { |
760 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
761 | d+=dd; | |
762 | break; | |
763 | } | |
764 | if (TMath::Abs(z+3.9*i)<0.15) { | |
765 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
766 | d+=dd; | |
767 | break; | |
768 | } | |
769 | if (TMath::Abs(z-1.85-3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
770 | if (TMath::Abs(z+2.05+3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
a9a2d814 | 771 | } |
772 | } else | |
773 | if (13<fR&&fR<26) { //SDD | |
61ab8ea8 | 774 | Double_t dd=0.0033; |
775 | d=dd; | |
776 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
777 | ||
778 | if (TMath::Abs(y-1.80)<0.55) { | |
779 | d+=0.016; | |
780 | for (Int_t j=0; j<20; j++) { | |
781 | if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
782 | if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
783 | } | |
784 | } | |
785 | if (TMath::Abs(y+1.80)<0.55) { | |
786 | d+=0.016; | |
787 | for (Int_t j=0; j<20; j++) { | |
788 | if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
789 | if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
790 | } | |
791 | } | |
792 | ||
793 | for (Int_t i=0; i<4; i++) { | |
794 | if (TMath::Abs(z-7.3*i)<0.60) { | |
795 | d+=dd; | |
796 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
797 | break; | |
798 | } | |
799 | if (TMath::Abs(z+7.3*i)<0.60) { | |
800 | d+=dd; | |
801 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
802 | break; | |
803 | } | |
a9a2d814 | 804 | } |
805 | } else | |
806 | if (6<fR&&fR<8) { //SPD2 | |
61ab8ea8 | 807 | Double_t dd=0.0063; x0=21.5; |
808 | d=dd; | |
809 | if (TMath::Abs(y-3.08)>0.5) d+=dd; | |
810 | //if (TMath::Abs(y-3.08)>0.45) d+=dd; | |
811 | if (TMath::Abs(y-3.03)<0.10) {d+=0.014;} | |
a9a2d814 | 812 | } else |
813 | if (3<fR&&fR<5) { //SPD1 | |
61ab8ea8 | 814 | Double_t dd=0.0063; x0=21.5; |
815 | d=dd; | |
816 | if (TMath::Abs(y+0.21)>0.6) d+=dd; | |
817 | //if (TMath::Abs(y+0.21)>0.45) d+=dd; | |
818 | if (TMath::Abs(y+0.10)<0.10) {d+=0.014;} | |
a9a2d814 | 819 | } |
820 | ||
a9a2d814 | 821 | return d; |
822 | } | |
006b5f7f | 823 | |
a9a2d814 | 824 | Double_t AliITStrackerV2::GetEffectiveThickness(Double_t y,Double_t z) const |
006b5f7f | 825 | { |
826 | //-------------------------------------------------------------------- | |
a9a2d814 | 827 | //Returns the thickness between the current layer and the vertex (units X0) |
006b5f7f | 828 | //-------------------------------------------------------------------- |
61ab8ea8 | 829 | Double_t d=0.0028*3*3; //beam pipe |
830 | Double_t x0=0; | |
006b5f7f | 831 | |
18856a77 | 832 | Double_t xn=fgLayers[fI].GetR(); |
006b5f7f | 833 | for (Int_t i=0; i<fI; i++) { |
18856a77 | 834 | Double_t xi=fgLayers[i].GetR(); |
835 | d+=fgLayers[i].GetThickness(y,z,x0)*xi*xi; | |
006b5f7f | 836 | } |
837 | ||
838 | if (fI>1) { | |
61ab8ea8 | 839 | Double_t xi=9.; |
840 | d+=0.0097*xi*xi; | |
006b5f7f | 841 | } |
842 | ||
843 | if (fI>3) { | |
18856a77 | 844 | Double_t xi=0.5*(fgLayers[3].GetR()+fgLayers[4].GetR()); |
61ab8ea8 | 845 | d+=0.0034*xi*xi; |
006b5f7f | 846 | } |
61ab8ea8 | 847 | |
006b5f7f | 848 | return d/(xn*xn); |
849 | } | |
850 | ||
006b5f7f | 851 | Int_t AliITStrackerV2::AliITSlayer::InRoad() const { |
852 | //-------------------------------------------------------------------- | |
853 | // This function returns number of clusters within the "window" | |
854 | //-------------------------------------------------------------------- | |
855 | Int_t ncl=0; | |
856 | for (Int_t i=fI; i<fN; i++) { | |
857 | const AliITSclusterV2 *c=fClusters[i]; | |
858 | if (c->GetZ() > fZmax) break; | |
a9a2d814 | 859 | if (c->IsUsed()) continue; |
006b5f7f | 860 | const AliITSdetector &det=GetDetector(c->GetDetectorIndex()); |
861 | Double_t y=fR*det.GetPhi() + c->GetY(); | |
862 | ||
863 | if (y>2.*fR*TMath::Pi()) y -= 2*fR*TMath::Pi(); | |
864 | if (y>1.*fR*TMath::Pi() && fYmax<y) y -= 2*fR*TMath::Pi(); | |
865 | ||
866 | if (y<fYmin) continue; | |
867 | if (y>fYmax) continue; | |
868 | ncl++; | |
869 | } | |
870 | return ncl; | |
871 | } | |
872 | ||
880f41b9 | 873 | Bool_t |
c630aafd | 874 | AliITStrackerV2::RefitAt(Double_t xx,AliITStrackV2 *t,const AliITStrackV2 *c) { |
4ab260d6 | 875 | //-------------------------------------------------------------------- |
c630aafd | 876 | // This function refits the track "t" at the position "x" using |
877 | // the clusters from "c" | |
4ab260d6 | 878 | //-------------------------------------------------------------------- |
880f41b9 | 879 | Int_t index[kMaxLayer]; |
880 | Int_t k; | |
881 | for (k=0; k<kMaxLayer; k++) index[k]=-1; | |
c630aafd | 882 | Int_t nc=c->GetNumberOfClusters(); |
880f41b9 | 883 | for (k=0; k<nc; k++) { |
c630aafd | 884 | Int_t idx=c->GetClusterIndex(k),nl=(idx&0xf0000000)>>28; |
880f41b9 | 885 | index[nl]=idx; |
886 | } | |
880f41b9 | 887 | |
4ab260d6 | 888 | Int_t from, to, step; |
ee34184f | 889 | if (xx > t->GetX()) { |
4ab260d6 | 890 | from=0; to=kMaxLayer; |
891 | step=+1; | |
892 | } else { | |
893 | from=kMaxLayer-1; to=-1; | |
894 | step=-1; | |
895 | } | |
896 | ||
897 | for (Int_t i=from; i != to; i += step) { | |
18856a77 | 898 | AliITSlayer &layer=fgLayers[i]; |
4ab260d6 | 899 | Double_t r=layer.GetR(); |
900 | ||
901 | { | |
902 | Double_t hI=i-0.5*step; | |
880f41b9 | 903 | if (TMath::Abs(hI-1.5)<0.01 || TMath::Abs(hI-3.5)<0.01) { |
18856a77 | 904 | Double_t rs=0.5*(fgLayers[i-step].GetR() + r); |
61ab8ea8 | 905 | Double_t d=0.0034, x0=38.6; |
880f41b9 | 906 | if (TMath::Abs(hI-1.5)<0.01) {rs=9.; d=0.0097; x0=42;} |
907 | if (!t->PropagateTo(rs,-step*d,x0)) { | |
4ab260d6 | 908 | return kFALSE; |
909 | } | |
910 | } | |
911 | } | |
912 | ||
880f41b9 | 913 | // remember old position [SR, GSI 18.02.2003] |
914 | Double_t oldX=0., oldY=0., oldZ=0.; | |
915 | if (t->IsStartedTimeIntegral() && step==1) { | |
916 | t->GetGlobalXYZat(t->GetX(),oldX,oldY,oldZ); | |
917 | } | |
918 | // | |
919 | ||
4ab260d6 | 920 | Double_t x,y,z; |
921 | if (!t->GetGlobalXYZat(r,x,y,z)) { | |
922 | return kFALSE; | |
923 | } | |
924 | Double_t phi=TMath::ATan2(y,x); | |
925 | Int_t idet=layer.FindDetectorIndex(phi,z); | |
926 | if (idet<0) { | |
927 | return kFALSE; | |
928 | } | |
929 | const AliITSdetector &det=layer.GetDetector(idet); | |
930 | phi=det.GetPhi(); | |
931 | if (!t->Propagate(phi,det.GetR())) { | |
932 | return kFALSE; | |
933 | } | |
934 | t->SetDetectorIndex(idet); | |
935 | ||
936 | const AliITSclusterV2 *cl=0; | |
937 | Double_t maxchi2=kMaxChi2; | |
938 | ||
939 | Int_t idx=index[i]; | |
940 | if (idx>0) { | |
941 | const AliITSclusterV2 *c=(AliITSclusterV2 *)GetCluster(idx); | |
942 | if (idet != c->GetDetectorIndex()) { | |
943 | idet=c->GetDetectorIndex(); | |
944 | const AliITSdetector &det=layer.GetDetector(idet); | |
945 | if (!t->Propagate(det.GetPhi(),det.GetR())) { | |
946 | return kFALSE; | |
947 | } | |
948 | t->SetDetectorIndex(idet); | |
949 | } | |
950 | Double_t chi2=t->GetPredictedChi2(c); | |
c630aafd | 951 | if (chi2<maxchi2) { |
952 | cl=c; | |
953 | maxchi2=chi2; | |
954 | } else { | |
955 | return kFALSE; | |
956 | } | |
4ab260d6 | 957 | } |
4ab260d6 | 958 | /* |
959 | if (cl==0) | |
960 | if (t->GetNumberOfClusters()>2) { | |
961 | Double_t dz=4*TMath::Sqrt(t->GetSigmaZ2()+kSigmaZ2[i]); | |
962 | Double_t dy=4*TMath::Sqrt(t->GetSigmaY2()+kSigmaY2[i]); | |
963 | Double_t zmin=t->GetZ() - dz; | |
964 | Double_t zmax=t->GetZ() + dz; | |
965 | Double_t ymin=t->GetY() + phi*r - dy; | |
966 | Double_t ymax=t->GetY() + phi*r + dy; | |
967 | layer.SelectClusters(zmin,zmax,ymin,ymax); | |
968 | ||
969 | const AliITSclusterV2 *c=0; Int_t ci=-1; | |
970 | while ((c=layer.GetNextCluster(ci))!=0) { | |
971 | if (idet != c->GetDetectorIndex()) continue; | |
972 | Double_t chi2=t->GetPredictedChi2(c); | |
973 | if (chi2<maxchi2) { cl=c; maxchi2=chi2; idx=ci; } | |
974 | } | |
975 | } | |
976 | */ | |
4ab260d6 | 977 | if (cl) { |
978 | if (!t->Update(cl,maxchi2,idx)) { | |
979 | return kFALSE; | |
980 | } | |
880f41b9 | 981 | t->SetSampledEdx(cl->GetQ(),t->GetNumberOfClusters()-1); |
4ab260d6 | 982 | } |
983 | ||
984 | { | |
61ab8ea8 | 985 | Double_t x0; |
986 | Double_t d=layer.GetThickness(t->GetY(),t->GetZ(),x0); | |
987 | t->CorrectForMaterial(-step*d,x0); | |
4ab260d6 | 988 | } |
880f41b9 | 989 | |
990 | // track time update [SR, GSI 17.02.2003] | |
991 | if (t->IsStartedTimeIntegral() && step==1) { | |
992 | Double_t newX, newY, newZ; | |
993 | t->GetGlobalXYZat(t->GetX(),newX,newY,newZ); | |
994 | Double_t dL2 = (oldX-newX)*(oldX-newX) + (oldY-newY)*(oldY-newY) + | |
995 | (oldZ-newZ)*(oldZ-newZ); | |
996 | t->AddTimeStep(TMath::Sqrt(dL2)); | |
997 | } | |
998 | // | |
4ab260d6 | 999 | |
1000 | } | |
1001 | ||
ee34184f | 1002 | if (!t->PropagateTo(xx,0.,0.)) return kFALSE; |
4ab260d6 | 1003 | return kTRUE; |
1004 | } | |
1005 | ||
b87bd7cd | 1006 | void AliITStrackerV2::UseClusters(const AliKalmanTrack *t, Int_t from) const { |
1007 | //-------------------------------------------------------------------- | |
1008 | // This function marks clusters assigned to the track | |
1009 | //-------------------------------------------------------------------- | |
1010 | AliTracker::UseClusters(t,from); | |
880f41b9 | 1011 | |
b87bd7cd | 1012 | AliITSclusterV2 *c=(AliITSclusterV2 *)GetCluster(t->GetClusterIndex(0)); |
1013 | //if (c->GetQ()>2) c->Use(); | |
1014 | if (c->GetSigmaZ2()>0.1) c->Use(); | |
1015 | c=(AliITSclusterV2 *)GetCluster(t->GetClusterIndex(1)); | |
1016 | //if (c->GetQ()>2) c->Use(); | |
1017 | if (c->GetSigmaZ2()>0.1) c->Use(); | |
880f41b9 | 1018 | |
b87bd7cd | 1019 | } |