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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 | |
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 | ||
c219fd63 | 46 | Float_t x,y,z; Int_t i; |
c630aafd | 47 | for (i=1; i<kMaxLayer+1; i++) { |
006b5f7f | 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 | ||
18856a77 | 64 | new (fgLayers+i-1) AliITSlayer(r,poff,zoff,nlad,ndet); |
006b5f7f | 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 | ||
f363d377 | 71 | Double_t phi=TMath::ATan2(rot[1],rot[0])+TMath::Pi(); |
72 | phi+=TMath::Pi()/2; | |
73 | if (i==1) phi+=TMath::Pi(); | |
c219fd63 | 74 | |
75 | if (phi<0) phi+=TMath::TwoPi(); | |
76 | else if (phi>=TMath::TwoPi()) phi-=TMath::TwoPi(); | |
77 | ||
f363d377 | 78 | Double_t cp=TMath::Cos(phi), sp=TMath::Sin(phi); |
79 | Double_t r=x*cp+y*sp; | |
006b5f7f | 80 | |
18856a77 | 81 | AliITSdetector &det=fgLayers[i-1].GetDetector((j-1)*ndet + k-1); |
006b5f7f | 82 | new(&det) AliITSdetector(r,phi); |
83 | } | |
84 | } | |
c630aafd | 85 | |
006b5f7f | 86 | } |
87 | ||
61ab8ea8 | 88 | fI=kMaxLayer; |
743a19f2 | 89 | |
61ab8ea8 | 90 | fPass=0; |
c219fd63 | 91 | fConstraint[0]=1; fConstraint[1]=0; |
8676d691 | 92 | |
93 | Double_t xyz[]={kXV,kYV,kZV}, ers[]={kSigmaXV,kSigmaYV,kSigmaZV}; | |
94 | SetVertex(xyz,ers); | |
c0dd5278 | 95 | |
96 | for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=kLayersNotToSkip[i]; | |
97 | fLastLayerToTrackTo=kLastLayerToTrackTo; | |
98 | ||
99 | } | |
100 | ||
101 | void AliITStrackerV2::SetLayersNotToSkip(Int_t *l) { | |
102 | //-------------------------------------------------------------------- | |
103 | //This function set masks of the layers which must be not skipped | |
104 | //-------------------------------------------------------------------- | |
105 | for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=l[i]; | |
61ab8ea8 | 106 | } |
006b5f7f | 107 | |
c630aafd | 108 | Int_t AliITStrackerV2::LoadClusters(TTree *cTree) { |
61ab8ea8 | 109 | //-------------------------------------------------------------------- |
110 | //This function loads ITS clusters | |
111 | //-------------------------------------------------------------------- | |
00a7cc50 | 112 | TBranch *branch=cTree->GetBranch("ITSRecPoints"); |
61ab8ea8 | 113 | if (!branch) { |
c630aafd | 114 | Error("LoadClusters"," can't get the branch !\n"); |
8676d691 | 115 | return 1; |
61ab8ea8 | 116 | } |
006b5f7f | 117 | |
00a7cc50 | 118 | TClonesArray dummy("AliITSRecPoint",10000), *clusters=&dummy; |
61ab8ea8 | 119 | branch->SetAddress(&clusters); |
006b5f7f | 120 | |
61ab8ea8 | 121 | Int_t j=0; |
122 | for (Int_t i=0; i<kMaxLayer; i++) { | |
18856a77 | 123 | Int_t ndet=fgLayers[i].GetNdetectors(); |
124 | Int_t jmax = j + fgLayers[i].GetNladders()*ndet; | |
c219fd63 | 125 | |
126 | Double_t r=fgLayers[i].GetR(); | |
127 | Double_t circ=TMath::TwoPi()*r; | |
128 | ||
61ab8ea8 | 129 | for (; j<jmax; j++) { |
130 | if (!cTree->GetEvent(j)) continue; | |
131 | Int_t ncl=clusters->GetEntriesFast(); | |
132 | while (ncl--) { | |
00a7cc50 | 133 | AliITSRecPoint *c=(AliITSRecPoint*)clusters->UncheckedAt(ncl); |
c219fd63 | 134 | |
135 | Int_t idx=c->GetDetectorIndex(); | |
136 | Double_t y=r*fgLayers[i].GetDetector(idx).GetPhi()+c->GetY(); | |
137 | if (y>circ) y-=circ; else if (y<0) y+=circ; | |
138 | c->SetPhiR(y); | |
139 | ||
00a7cc50 | 140 | fgLayers[i].InsertCluster(new AliITSRecPoint(*c)); |
61ab8ea8 | 141 | } |
142 | clusters->Delete(); | |
143 | } | |
18856a77 | 144 | fgLayers[i].ResetRoad(); //road defined by the cluster density |
006b5f7f | 145 | } |
c630aafd | 146 | |
8676d691 | 147 | return 0; |
61ab8ea8 | 148 | } |
006b5f7f | 149 | |
61ab8ea8 | 150 | void AliITStrackerV2::UnloadClusters() { |
151 | //-------------------------------------------------------------------- | |
152 | //This function unloads ITS clusters | |
153 | //-------------------------------------------------------------------- | |
18856a77 | 154 | for (Int_t i=0; i<kMaxLayer; i++) fgLayers[i].ResetClusters(); |
006b5f7f | 155 | } |
156 | ||
880f41b9 | 157 | static Int_t CorrectForDeadZoneMaterial(AliITStrackV2 *t) { |
158 | //-------------------------------------------------------------------- | |
159 | // Correction for the material between the TPC and the ITS | |
160 | // (should it belong to the TPC code ?) | |
161 | //-------------------------------------------------------------------- | |
162 | Double_t riw=80., diw=0.0053, x0iw=30; // TPC inner wall ? | |
163 | Double_t rcd=61., dcd=0.0053, x0cd=30; // TPC "central drum" ? | |
164 | Double_t yr=12.8, dr=0.03; // rods ? | |
165 | Double_t zm=0.2, dm=0.40; // membrane | |
166 | //Double_t rr=52., dr=0.19, x0r=24., yyr=7.77; //rails | |
167 | Double_t rs=50., ds=0.001; // something belonging to the ITS (screen ?) | |
168 | ||
169 | if (t->GetX() > riw) { | |
170 | if (!t->PropagateTo(riw,diw,x0iw)) return 1; | |
171 | if (TMath::Abs(t->GetY())>yr) t->CorrectForMaterial(dr); | |
172 | if (TMath::Abs(t->GetZ())<zm) t->CorrectForMaterial(dm); | |
173 | if (!t->PropagateTo(rcd,dcd,x0cd)) return 1; | |
174 | //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z); | |
175 | //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,dr,x0r); | |
176 | if (!t->PropagateTo(rs,ds)) return 1; | |
177 | } else if (t->GetX() < rs) { | |
178 | if (!t->PropagateTo(rs,-ds)) return 1; | |
179 | //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z); | |
180 | //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,-dr,x0r); | |
181 | if (!t->PropagateTo(rcd,-dcd,x0cd)) return 1; | |
ba1a3e1a | 182 | if (!t->PropagateTo(riw+0.001,-diw,x0iw)) return 1; |
880f41b9 | 183 | } else { |
184 | ::Error("CorrectForDeadZoneMaterial","track is already in the dead zone !"); | |
185 | return 1; | |
186 | } | |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
c630aafd | 191 | Int_t AliITStrackerV2::Clusters2Tracks(AliESD *event) { |
006b5f7f | 192 | //-------------------------------------------------------------------- |
c630aafd | 193 | // This functions reconstructs ITS tracks |
194 | // The clusters must be already loaded ! | |
006b5f7f | 195 | //-------------------------------------------------------------------- |
c630aafd | 196 | TObjArray itsTracks(15000); |
006b5f7f | 197 | |
c630aafd | 198 | {/* Read ESD tracks */ |
199 | Int_t nentr=event->GetNumberOfTracks(); | |
200 | Info("Clusters2Tracks", "Number of ESD tracks: %d\n", nentr); | |
201 | while (nentr--) { | |
202 | AliESDtrack *esd=event->GetTrack(nentr); | |
203 | ||
ba1a3e1a | 204 | if ((esd->GetStatus()&AliESDtrack::kTPCin)==0) continue; |
205 | if (esd->GetStatus()&AliESDtrack::kTPCout) continue; | |
206 | if (esd->GetStatus()&AliESDtrack::kITSin) continue; | |
c630aafd | 207 | |
208 | AliITStrackV2 *t=0; | |
209 | try { | |
210 | t=new AliITStrackV2(*esd); | |
211 | } catch (const Char_t *msg) { | |
212 | Warning("Clusters2Tracks",msg); | |
213 | delete t; | |
214 | continue; | |
215 | } | |
15dd636f | 216 | if (TMath::Abs(t->GetD())>4) { |
ebd8369c | 217 | delete t; |
218 | continue; | |
219 | } | |
006b5f7f | 220 | |
c630aafd | 221 | if (CorrectForDeadZoneMaterial(t)!=0) { |
222 | Warning("Clusters2Tracks", | |
223 | "failed to correct for the material in the dead zone !\n"); | |
224 | delete t; | |
225 | continue; | |
226 | } | |
227 | itsTracks.AddLast(t); | |
228 | } | |
229 | } /* End Read ESD tracks */ | |
230 | ||
231 | itsTracks.Sort(); | |
232 | Int_t nentr=itsTracks.GetEntriesFast(); | |
15dd636f | 233 | |
c630aafd | 234 | Int_t ntrk=0; |
235 | for (fPass=0; fPass<2; fPass++) { | |
236 | Int_t &constraint=fConstraint[fPass]; if (constraint<0) continue; | |
237 | for (Int_t i=0; i<nentr; i++) { | |
238 | AliITStrackV2 *t=(AliITStrackV2*)itsTracks.UncheckedAt(i); | |
15dd636f | 239 | if (t==0) continue; //this track has been already tracked |
c630aafd | 240 | Int_t tpcLabel=t->GetLabel(); //save the TPC track label |
241 | ||
242 | ResetTrackToFollow(*t); | |
243 | ResetBestTrack(); | |
244 | ||
245 | for (FollowProlongation(); fI<kMaxLayer; fI++) { | |
15dd636f | 246 | while (TakeNextProlongation()) FollowProlongation(); |
c630aafd | 247 | } |
248 | ||
de5d3595 | 249 | if (fBestTrack.GetNumberOfClusters() == 0) continue; |
15dd636f | 250 | |
c630aafd | 251 | if (fConstraint[fPass]) { |
15dd636f | 252 | ResetTrackToFollow(*t); |
253 | if (!RefitAt(3.7, &fTrackToFollow, &fBestTrack)) continue; | |
254 | ResetBestTrack(); | |
255 | } | |
256 | ||
c630aafd | 257 | fBestTrack.SetLabel(tpcLabel); |
258 | fBestTrack.CookdEdx(); | |
259 | CookLabel(&fBestTrack,0.); //For comparison only | |
260 | fBestTrack.UpdateESDtrack(AliESDtrack::kITSin); | |
15dd636f | 261 | UseClusters(&fBestTrack); |
c630aafd | 262 | delete itsTracks.RemoveAt(i); |
263 | ntrk++; | |
264 | } | |
265 | } | |
babd135a | 266 | |
c630aafd | 267 | itsTracks.Delete(); |
2257f27e | 268 | |
c630aafd | 269 | Info("Clusters2Tracks","Number of prolonged tracks: %d\n",ntrk); |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
c630aafd | 274 | Int_t AliITStrackerV2::PropagateBack(AliESD *event) { |
275 | //-------------------------------------------------------------------- | |
276 | // This functions propagates reconstructed ITS tracks back | |
277 | // The clusters must be loaded ! | |
278 | //-------------------------------------------------------------------- | |
279 | Int_t nentr=event->GetNumberOfTracks(); | |
280 | Info("PropagateBack", "Number of ESD tracks: %d\n", nentr); | |
281 | ||
282 | Int_t ntrk=0; | |
283 | for (Int_t i=0; i<nentr; i++) { | |
284 | AliESDtrack *esd=event->GetTrack(i); | |
285 | ||
ba1a3e1a | 286 | if ((esd->GetStatus()&AliESDtrack::kITSin)==0) continue; |
287 | if (esd->GetStatus()&AliESDtrack::kITSout) continue; | |
c630aafd | 288 | |
289 | AliITStrackV2 *t=0; | |
290 | try { | |
291 | t=new AliITStrackV2(*esd); | |
292 | } catch (const Char_t *msg) { | |
293 | Warning("PropagateBack",msg); | |
294 | delete t; | |
295 | continue; | |
296 | } | |
297 | ||
298 | ResetTrackToFollow(*t); | |
299 | ||
300 | // propagete to vertex [SR, GSI 17.02.2003] | |
a9459f9c | 301 | // Start Time measurement [SR, GSI 17.02.2003], corrected by I.Belikov |
302 | if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) { | |
303 | if (fTrackToFollow.PropagateToVertex()) { | |
304 | fTrackToFollow.StartTimeIntegral(); | |
305 | } | |
306 | fTrackToFollow.PropagateTo(3.,-0.0028,65.19); | |
307 | } | |
c630aafd | 308 | |
309 | fTrackToFollow.ResetCovariance(); fTrackToFollow.ResetClusters(); | |
310 | if (RefitAt(49.,&fTrackToFollow,t)) { | |
311 | if (CorrectForDeadZoneMaterial(&fTrackToFollow)!=0) { | |
312 | Warning("PropagateBack", | |
313 | "failed to correct for the material in the dead zone !\n"); | |
314 | delete t; | |
315 | continue; | |
316 | } | |
317 | fTrackToFollow.SetLabel(t->GetLabel()); | |
ba1a3e1a | 318 | //fTrackToFollow.CookdEdx(); |
c630aafd | 319 | CookLabel(&fTrackToFollow,0.); //For comparison only |
320 | fTrackToFollow.UpdateESDtrack(AliESDtrack::kITSout); | |
15dd636f | 321 | UseClusters(&fTrackToFollow); |
c630aafd | 322 | ntrk++; |
323 | } | |
324 | delete t; | |
325 | } | |
326 | ||
327 | Info("PropagateBack","Number of back propagated ITS tracks: %d\n",ntrk); | |
61ab8ea8 | 328 | |
83d73500 | 329 | return 0; |
330 | } | |
331 | ||
c630aafd | 332 | Int_t AliITStrackerV2::RefitInward(AliESD *event) { |
83d73500 | 333 | //-------------------------------------------------------------------- |
334 | // This functions refits ITS tracks using the | |
335 | // "inward propagated" TPC tracks | |
c630aafd | 336 | // The clusters must be loaded ! |
83d73500 | 337 | //-------------------------------------------------------------------- |
c630aafd | 338 | Int_t nentr=event->GetNumberOfTracks(); |
339 | Info("RefitInward", "Number of ESD tracks: %d\n", nentr); | |
340 | ||
341 | Int_t ntrk=0; | |
342 | for (Int_t i=0; i<nentr; i++) { | |
343 | AliESDtrack *esd=event->GetTrack(i); | |
344 | ||
ba1a3e1a | 345 | if ((esd->GetStatus()&AliESDtrack::kITSout) == 0) continue; |
346 | if (esd->GetStatus()&AliESDtrack::kITSrefit) continue; | |
347 | if (esd->GetStatus()&AliESDtrack::kTPCout) | |
15dd636f | 348 | if ((esd->GetStatus()&AliESDtrack::kTPCrefit)==0) continue; |
c630aafd | 349 | |
350 | AliITStrackV2 *t=0; | |
351 | try { | |
352 | t=new AliITStrackV2(*esd); | |
353 | } catch (const Char_t *msg) { | |
354 | Warning("RefitInward",msg); | |
355 | delete t; | |
356 | continue; | |
357 | } | |
358 | ||
359 | if (CorrectForDeadZoneMaterial(t)!=0) { | |
360 | Warning("RefitInward", | |
361 | "failed to correct for the material in the dead zone !\n"); | |
362 | delete t; | |
363 | continue; | |
364 | } | |
365 | ||
366 | ResetTrackToFollow(*t); | |
367 | fTrackToFollow.ResetClusters(); | |
368 | ||
369 | //Refitting... | |
370 | if (RefitAt(3.7, &fTrackToFollow, t)) { | |
371 | fTrackToFollow.SetLabel(t->GetLabel()); | |
372 | fTrackToFollow.CookdEdx(); | |
15dd636f | 373 | CookLabel(&fTrackToFollow,0.); //For comparison only |
18856a77 | 374 | |
49d13e89 | 375 | if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) {//The beam pipe |
376 | AliESDtrack *esdTrack =fTrackToFollow.GetESDtrack(); | |
377 | esdTrack->UpdateTrackParams(&fTrackToFollow,AliESDtrack::kITSrefit); | |
378 | Float_t r[3]={0.,0.,0.}; | |
379 | Double_t maxD=3.; | |
380 | esdTrack->RelateToVertex(event->GetVertex(),GetBz(r),maxD); | |
381 | ntrk++; | |
67c3dcbe | 382 | } |
c630aafd | 383 | } |
384 | delete t; | |
385 | } | |
386 | ||
387 | Info("RefitInward","Number of refitted tracks: %d\n",ntrk); | |
83d73500 | 388 | |
c630aafd | 389 | return 0; |
390 | } | |
83d73500 | 391 | |
006b5f7f | 392 | AliCluster *AliITStrackerV2::GetCluster(Int_t index) const { |
393 | //-------------------------------------------------------------------- | |
394 | // Return pointer to a given cluster | |
395 | //-------------------------------------------------------------------- | |
396 | Int_t l=(index & 0xf0000000) >> 28; | |
397 | Int_t c=(index & 0x0fffffff) >> 00; | |
18856a77 | 398 | return fgLayers[l].GetCluster(c); |
006b5f7f | 399 | } |
400 | ||
401 | ||
402 | void AliITStrackerV2::FollowProlongation() { | |
403 | //-------------------------------------------------------------------- | |
404 | //This function finds a track prolongation | |
405 | //-------------------------------------------------------------------- | |
c0dd5278 | 406 | while (fI>fLastLayerToTrackTo) { |
a9a2d814 | 407 | Int_t i=fI-1; |
8676d691 | 408 | |
18856a77 | 409 | AliITSlayer &layer=fgLayers[i]; |
a9a2d814 | 410 | AliITStrackV2 &track=fTracks[i]; |
006b5f7f | 411 | |
14825d5a | 412 | Double_t r=layer.GetR(); |
61ab8ea8 | 413 | |
a9a2d814 | 414 | if (i==3 || i==1) { |
18856a77 | 415 | Double_t rs=0.5*(fgLayers[i+1].GetR() + r); |
61ab8ea8 | 416 | Double_t d=0.0034, x0=38.6; |
417 | if (i==1) {rs=9.; d=0.0097; x0=42;} | |
418 | if (!fTrackToFollow.PropagateTo(rs,d,x0)) { | |
8676d691 | 419 | //Warning("FollowProlongation","propagation failed !\n"); |
c0dd5278 | 420 | return; |
a9a2d814 | 421 | } |
006b5f7f | 422 | } |
423 | ||
424 | //find intersection | |
425 | Double_t x,y,z; | |
14825d5a | 426 | if (!fTrackToFollow.GetGlobalXYZat(r,x,y,z)) { |
8676d691 | 427 | //Warning("FollowProlongation","failed to estimate track !\n"); |
c0dd5278 | 428 | return; |
006b5f7f | 429 | } |
430 | Double_t phi=TMath::ATan2(y,x); | |
f363d377 | 431 | |
006b5f7f | 432 | Int_t idet=layer.FindDetectorIndex(phi,z); |
433 | if (idet<0) { | |
8676d691 | 434 | //Warning("FollowProlongation","failed to find a detector !\n"); |
c0dd5278 | 435 | return; |
006b5f7f | 436 | } |
437 | ||
438 | //propagate to the intersection | |
439 | const AliITSdetector &det=layer.GetDetector(idet); | |
14825d5a | 440 | phi=det.GetPhi(); |
a9a2d814 | 441 | if (!fTrackToFollow.Propagate(phi,det.GetR())) { |
8676d691 | 442 | //Warning("FollowProlongation","propagation failed !\n"); |
c0dd5278 | 443 | return; |
006b5f7f | 444 | } |
445 | fTrackToFollow.SetDetectorIndex(idet); | |
446 | ||
447 | //Select possible prolongations and store the current track estimation | |
448 | track.~AliITStrackV2(); new(&track) AliITStrackV2(fTrackToFollow); | |
8676d691 | 449 | Double_t dz=7*TMath::Sqrt(track.GetSigmaZ2() + kSigmaZ2[i]); |
450 | Double_t dy=7*TMath::Sqrt(track.GetSigmaY2() + kSigmaY2[i]); | |
451 | Double_t road=layer.GetRoad(); | |
452 | if (dz*dy>road*road) { | |
453 | Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd; | |
454 | dz=road*scz; dy=road*scy; | |
455 | } | |
b87bd7cd | 456 | |
457 | //Double_t dz=4*TMath::Sqrt(track.GetSigmaZ2() + kSigmaZ2[i]); | |
14825d5a | 458 | if (dz < 0.5*TMath::Abs(track.GetTgl())) dz=0.5*TMath::Abs(track.GetTgl()); |
7f6ddf58 | 459 | if (dz > kMaxRoad) { |
8676d691 | 460 | //Warning("FollowProlongation","too broad road in Z !\n"); |
c0dd5278 | 461 | return; |
006b5f7f | 462 | } |
a9a2d814 | 463 | |
15dd636f | 464 | if (TMath::Abs(fTrackToFollow.GetZ()-GetZ()) > r+dz) return; |
a9a2d814 | 465 | |
b87bd7cd | 466 | //Double_t dy=4*TMath::Sqrt(track.GetSigmaY2() + kSigmaY2[i]); |
14825d5a | 467 | if (dy < 0.5*TMath::Abs(track.GetSnp())) dy=0.5*TMath::Abs(track.GetSnp()); |
7f6ddf58 | 468 | if (dy > kMaxRoad) { |
8676d691 | 469 | //Warning("FollowProlongation","too broad road in Y !\n"); |
c0dd5278 | 470 | return; |
006b5f7f | 471 | } |
a9a2d814 | 472 | |
c219fd63 | 473 | fI--; |
474 | ||
7f6ddf58 | 475 | Double_t zmin=track.GetZ() - dz; |
006b5f7f | 476 | Double_t zmax=track.GetZ() + dz; |
14825d5a | 477 | Double_t ymin=track.GetY() + r*phi - dy; |
478 | Double_t ymax=track.GetY() + r*phi + dy; | |
c219fd63 | 479 | if (layer.SelectClusters(zmin,zmax,ymin,ymax)==0) |
480 | if (fLayersNotToSkip[fI]) return; | |
006b5f7f | 481 | |
15dd636f | 482 | if (!TakeNextProlongation()) |
483 | if (fLayersNotToSkip[fI]) return; | |
484 | ||
006b5f7f | 485 | } |
486 | ||
487 | //deal with the best track | |
488 | Int_t ncl=fTrackToFollow.GetNumberOfClusters(); | |
489 | Int_t nclb=fBestTrack.GetNumberOfClusters(); | |
15dd636f | 490 | if (ncl) |
491 | if (ncl >= nclb) { | |
492 | Double_t chi2=fTrackToFollow.GetChi2(); | |
493 | if (chi2/ncl < kChi2PerCluster) { | |
494 | if (ncl > nclb || chi2 < fBestTrack.GetChi2()) { | |
495 | ResetBestTrack(); | |
006b5f7f | 496 | } |
15dd636f | 497 | } |
006b5f7f | 498 | } |
15dd636f | 499 | |
006b5f7f | 500 | } |
501 | ||
006b5f7f | 502 | Int_t AliITStrackerV2::TakeNextProlongation() { |
503 | //-------------------------------------------------------------------- | |
a9a2d814 | 504 | // This function takes another track prolongation |
505 | // | |
506 | // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch | |
006b5f7f | 507 | //-------------------------------------------------------------------- |
18856a77 | 508 | AliITSlayer &layer=fgLayers[fI]; |
4ab260d6 | 509 | ResetTrackToFollow(fTracks[fI]); |
006b5f7f | 510 | |
b87bd7cd | 511 | Double_t dz=7*TMath::Sqrt(fTrackToFollow.GetSigmaZ2() + kSigmaZ2[fI]); |
512 | Double_t dy=7*TMath::Sqrt(fTrackToFollow.GetSigmaY2() + kSigmaY2[fI]); | |
8676d691 | 513 | Double_t road=layer.GetRoad(); |
514 | if (dz*dy>road*road) { | |
515 | Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd; | |
516 | dz=road*scz; dy=road*scy; | |
517 | } | |
006b5f7f | 518 | |
00a7cc50 | 519 | const AliITSRecPoint *c=0; Int_t ci=-1; |
520 | const AliITSRecPoint *cc=0; Int_t cci=-1; | |
c219fd63 | 521 | Double_t chi2=kMaxChi2; |
006b5f7f | 522 | while ((c=layer.GetNextCluster(ci))!=0) { |
006b5f7f | 523 | Int_t idet=c->GetDetectorIndex(); |
15dd636f | 524 | |
4ab260d6 | 525 | if (fTrackToFollow.GetDetectorIndex()!=idet) { |
006b5f7f | 526 | const AliITSdetector &det=layer.GetDetector(idet); |
4ab260d6 | 527 | ResetTrackToFollow(fTracks[fI]); |
528 | if (!fTrackToFollow.Propagate(det.GetPhi(),det.GetR())) { | |
8676d691 | 529 | //Warning("TakeNextProlongation","propagation failed !\n"); |
006b5f7f | 530 | continue; |
531 | } | |
4ab260d6 | 532 | fTrackToFollow.SetDetectorIndex(idet); |
533 | if (TMath::Abs(fTrackToFollow.GetZ()-GetZ())>layer.GetR()+dz) continue; | |
006b5f7f | 534 | } |
535 | ||
4ab260d6 | 536 | if (TMath::Abs(fTrackToFollow.GetZ() - c->GetZ()) > dz) continue; |
537 | if (TMath::Abs(fTrackToFollow.GetY() - c->GetY()) > dy) continue; | |
006b5f7f | 538 | |
c219fd63 | 539 | Double_t ch2=fTrackToFollow.GetPredictedChi2(c); |
540 | if (ch2 > chi2) continue; | |
541 | chi2=ch2; | |
542 | cc=c; cci=ci; | |
543 | break; | |
006b5f7f | 544 | } |
545 | ||
c219fd63 | 546 | if (!cc) return 0; |
006b5f7f | 547 | |
c219fd63 | 548 | if (!fTrackToFollow.Update(cc,chi2,(fI<<28)+cci)) { |
8676d691 | 549 | //Warning("TakeNextProlongation","filtering failed !\n"); |
006b5f7f | 550 | return 0; |
551 | } | |
15dd636f | 552 | |
4ab260d6 | 553 | if (fTrackToFollow.GetNumberOfClusters()>1) |
554 | if (TMath::Abs(fTrackToFollow.GetD())>4) return 0; | |
555 | ||
a9a2d814 | 556 | fTrackToFollow. |
c219fd63 | 557 | SetSampledEdx(cc->GetQ(),fTrackToFollow.GetNumberOfClusters()-1); //b.b. |
a9a2d814 | 558 | |
559 | { | |
880f41b9 | 560 | Double_t x0; |
61ab8ea8 | 561 | Double_t d=layer.GetThickness(fTrackToFollow.GetY(),fTrackToFollow.GetZ(),x0); |
880f41b9 | 562 | fTrackToFollow.CorrectForMaterial(d,x0); |
a9a2d814 | 563 | } |
4ab260d6 | 564 | |
a9a2d814 | 565 | if (fConstraint[fPass]) { |
4ab260d6 | 566 | Double_t d=GetEffectiveThickness(0,0); //Think of this !!!! |
8676d691 | 567 | Double_t xyz[]={GetX(),GetY(),GetZ()}; |
568 | Double_t ers[]={GetSigmaX(),GetSigmaY(),GetSigmaZ()}; | |
569 | fTrackToFollow.Improve(d,xyz,ers); | |
a9a2d814 | 570 | } |
006b5f7f | 571 | |
006b5f7f | 572 | return 1; |
573 | } | |
574 | ||
575 | ||
006b5f7f | 576 | AliITStrackerV2::AliITSlayer::AliITSlayer() { |
577 | //-------------------------------------------------------------------- | |
578 | //default AliITSlayer constructor | |
579 | //-------------------------------------------------------------------- | |
c219fd63 | 580 | fR=0.; fPhiOffset=0.; fZOffset=0.; |
581 | fNladders=0; fNdetectors=0; | |
006b5f7f | 582 | fDetectors=0; |
c219fd63 | 583 | |
584 | for (Int_t i=0; i<kNsector; i++) fN[i]=0; | |
585 | fNsel=0; | |
586 | ||
587 | fRoad=2*fR*TMath::Sqrt(3.14/1.);//assuming that there's only one cluster | |
006b5f7f | 588 | } |
589 | ||
590 | AliITStrackerV2::AliITSlayer:: | |
591 | AliITSlayer(Double_t r,Double_t p,Double_t z,Int_t nl,Int_t nd) { | |
592 | //-------------------------------------------------------------------- | |
593 | //main AliITSlayer constructor | |
594 | //-------------------------------------------------------------------- | |
595 | fR=r; fPhiOffset=p; fZOffset=z; | |
596 | fNladders=nl; fNdetectors=nd; | |
597 | fDetectors=new AliITSdetector[fNladders*fNdetectors]; | |
598 | ||
c219fd63 | 599 | for (Int_t i=0; i<kNsector; i++) fN[i]=0; |
600 | fNsel=0; | |
601 | ||
602 | for (Int_t i=0; i<kMaxClusterPerLayer; i++) fClusters[i]=0; | |
b87bd7cd | 603 | |
604 | fRoad=2*fR*TMath::Sqrt(3.14/1.);//assuming that there's only one cluster | |
006b5f7f | 605 | } |
606 | ||
607 | AliITStrackerV2::AliITSlayer::~AliITSlayer() { | |
608 | //-------------------------------------------------------------------- | |
609 | // AliITSlayer destructor | |
610 | //-------------------------------------------------------------------- | |
611 | delete[] fDetectors; | |
c219fd63 | 612 | ResetClusters(); |
006b5f7f | 613 | } |
614 | ||
61ab8ea8 | 615 | void AliITStrackerV2::AliITSlayer::ResetClusters() { |
616 | //-------------------------------------------------------------------- | |
617 | // This function removes loaded clusters | |
618 | //-------------------------------------------------------------------- | |
c219fd63 | 619 | for (Int_t s=0; s<kNsector; s++) { |
620 | Int_t &n=fN[s]; | |
621 | while (n) { | |
622 | n--; | |
623 | delete fClusters[s*kMaxClusterPerSector+n]; | |
624 | } | |
625 | } | |
61ab8ea8 | 626 | } |
627 | ||
b87bd7cd | 628 | void AliITStrackerV2::AliITSlayer::ResetRoad() { |
629 | //-------------------------------------------------------------------- | |
630 | // This function calculates the road defined by the cluster density | |
631 | //-------------------------------------------------------------------- | |
632 | Int_t n=0; | |
c219fd63 | 633 | for (Int_t s=0; s<kNsector; s++) { |
634 | Int_t i=fN[s]; | |
635 | while (i--) | |
636 | if (TMath::Abs(fClusters[s*kMaxClusterPerSector+i]->GetZ())<fR) n++; | |
b87bd7cd | 637 | } |
638 | if (n>1) fRoad=2*fR*TMath::Sqrt(3.14/n); | |
639 | } | |
640 | ||
00a7cc50 | 641 | Int_t AliITStrackerV2::AliITSlayer::InsertCluster(AliITSRecPoint *c) { |
006b5f7f | 642 | //-------------------------------------------------------------------- |
c219fd63 | 643 | // This function inserts a cluster to this layer in increasing |
644 | // order of the cluster's fZ | |
006b5f7f | 645 | //-------------------------------------------------------------------- |
c219fd63 | 646 | Float_t circ=TMath::TwoPi()*fR; |
647 | Int_t sec=Int_t(kNsector*c->GetPhiR()/circ); | |
81e97e0d | 648 | if (sec>=kNsector) { |
649 | ::Error("InsertCluster","Wrong sector !\n"); | |
650 | return 1; | |
651 | } | |
c219fd63 | 652 | Int_t &n=fN[sec]; |
653 | if (n>=kMaxClusterPerSector) { | |
654 | ::Error("InsertCluster","Too many clusters !\n"); | |
655 | return 1; | |
006b5f7f | 656 | } |
c219fd63 | 657 | if (n==0) fClusters[sec*kMaxClusterPerSector]=c; |
658 | else { | |
659 | Int_t i=FindClusterIndex(c->GetZ(),sec); | |
660 | Int_t k=n-i+sec*kMaxClusterPerSector; | |
00a7cc50 | 661 | memmove(fClusters+i+1 ,fClusters+i,k*sizeof(AliITSRecPoint*)); |
c219fd63 | 662 | fClusters[i]=c; |
663 | } | |
664 | n++; | |
006b5f7f | 665 | return 0; |
666 | } | |
667 | ||
c219fd63 | 668 | Int_t |
669 | AliITStrackerV2::AliITSlayer::FindClusterIndex(Float_t z,Int_t s) const { | |
006b5f7f | 670 | //-------------------------------------------------------------------- |
c219fd63 | 671 | // For the sector "s", this function returns the index of the first |
672 | // with its fZ >= "z". | |
006b5f7f | 673 | //-------------------------------------------------------------------- |
c219fd63 | 674 | Int_t nc=fN[s]; |
675 | if (nc==0) return kMaxClusterPerSector*s; | |
676 | ||
677 | Int_t b=kMaxClusterPerSector*s; | |
678 | if (z <= fClusters[b]->GetZ()) return b; | |
679 | ||
680 | Int_t e=b+nc-1; | |
681 | if (z > fClusters[e]->GetZ()) return e+1; | |
682 | ||
683 | Int_t m=(b+e)/2; | |
006b5f7f | 684 | for (; b<e; m=(b+e)/2) { |
685 | if (z > fClusters[m]->GetZ()) b=m+1; | |
686 | else e=m; | |
687 | } | |
688 | return m; | |
689 | } | |
690 | ||
c219fd63 | 691 | Int_t AliITStrackerV2::AliITSlayer:: |
692 | SelectClusters(Float_t zmin,Float_t zmax,Float_t ymin, Float_t ymax) { | |
006b5f7f | 693 | //-------------------------------------------------------------------- |
c219fd63 | 694 | // This function selects clusters within the "window" |
006b5f7f | 695 | //-------------------------------------------------------------------- |
c219fd63 | 696 | Float_t circ=fR*TMath::TwoPi(); |
697 | ||
698 | if (ymin>circ) ymin-=circ; else if (ymin<0) ymin+=circ; | |
699 | if (ymax>circ) ymax-=circ; else if (ymax<0) ymax+=circ; | |
700 | ||
521f4796 | 701 | Int_t i1=Int_t(kNsector*ymin/circ); if (i1==kNsector) i1--; |
c219fd63 | 702 | if (fN[i1]!=0) { |
703 | Float_t ym = (ymax<ymin) ? ymax+circ : ymax; | |
704 | Int_t i=FindClusterIndex(zmin,i1), imax=i1*kMaxClusterPerSector+fN[i1]; | |
705 | for (; i<imax; i++) { | |
00a7cc50 | 706 | AliITSRecPoint *c=fClusters[i]; |
c219fd63 | 707 | if (c->IsUsed()) continue; |
708 | if (c->GetZ()>zmax) break; | |
709 | if (c->GetPhiR()<=ymin) continue; | |
710 | if (c->GetPhiR()>ym) continue; | |
711 | fIndex[fNsel++]=i; | |
712 | } | |
713 | } | |
714 | ||
521f4796 | 715 | Int_t i2=Int_t(kNsector*ymax/circ); if (i2==kNsector) i2--; |
c219fd63 | 716 | if (i2==i1) return fNsel; |
717 | ||
718 | if (fN[i2]!=0) { | |
719 | Float_t ym = (ymin>ymax) ? ymin-circ : ymin; | |
720 | Int_t i=FindClusterIndex(zmin,i2), imax=i2*kMaxClusterPerSector+fN[i2]; | |
721 | for (; i<imax; i++) { | |
00a7cc50 | 722 | AliITSRecPoint *c=fClusters[i]; |
c219fd63 | 723 | if (c->IsUsed()) continue; |
724 | if (c->GetZ()>zmax) break; | |
725 | if (c->GetPhiR()<=ym) continue; | |
726 | if (c->GetPhiR()>ymax) continue; | |
727 | fIndex[fNsel++]=i; | |
728 | } | |
729 | } | |
730 | ||
731 | return fNsel; | |
006b5f7f | 732 | } |
733 | ||
00a7cc50 | 734 | const AliITSRecPoint *AliITStrackerV2::AliITSlayer::GetNextCluster(Int_t &ci){ |
006b5f7f | 735 | //-------------------------------------------------------------------- |
736 | // This function returns clusters within the "window" | |
737 | //-------------------------------------------------------------------- | |
00a7cc50 | 738 | AliITSRecPoint *c=0; |
c219fd63 | 739 | ci=-1; |
740 | if (fNsel) { | |
741 | fNsel--; | |
742 | ci=fIndex[fNsel]; | |
743 | c=fClusters[ci]; | |
006b5f7f | 744 | } |
c219fd63 | 745 | return c; |
746 | } | |
7f6ddf58 | 747 | |
c219fd63 | 748 | Int_t AliITStrackerV2::AliITSlayer::GetNumberOfClusters() const { |
749 | Int_t n=0; | |
750 | for (Int_t s=0; s<kNsector; s++) n+=fN[s]; | |
751 | return n; | |
006b5f7f | 752 | } |
753 | ||
c219fd63 | 754 | Int_t |
755 | AliITStrackerV2::AliITSlayer::FindDetectorIndex(Double_t phi,Double_t z)const { | |
006b5f7f | 756 | //-------------------------------------------------------------------- |
757 | //This function finds the detector crossed by the track | |
758 | //-------------------------------------------------------------------- | |
f363d377 | 759 | Double_t dphi=-(phi-fPhiOffset); |
006b5f7f | 760 | if (dphi < 0) dphi += 2*TMath::Pi(); |
761 | else if (dphi >= 2*TMath::Pi()) dphi -= 2*TMath::Pi(); | |
762 | Int_t np=Int_t(dphi*fNladders*0.5/TMath::Pi()+0.5); | |
3e3e8427 | 763 | if (np>=fNladders) np-=fNladders; |
764 | if (np<0) np+=fNladders; | |
006b5f7f | 765 | |
766 | Double_t dz=fZOffset-z; | |
767 | Int_t nz=Int_t(dz*(fNdetectors-1)*0.5/fZOffset+0.5); | |
3e3e8427 | 768 | if (nz>=fNdetectors) return -1; |
769 | if (nz<0) return -1; | |
006b5f7f | 770 | |
006b5f7f | 771 | return np*fNdetectors + nz; |
772 | } | |
773 | ||
774 | Double_t | |
61ab8ea8 | 775 | AliITStrackerV2::AliITSlayer::GetThickness(Double_t y,Double_t z,Double_t &x0) |
776 | const { | |
a9a2d814 | 777 | //-------------------------------------------------------------------- |
778 | //This function returns the layer thickness at this point (units X0) | |
779 | //-------------------------------------------------------------------- | |
780 | Double_t d=0.0085; | |
61ab8ea8 | 781 | x0=21.82; |
a9a2d814 | 782 | |
783 | if (43<fR&&fR<45) { //SSD2 | |
61ab8ea8 | 784 | Double_t dd=0.0034; |
785 | d=dd; | |
786 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
787 | if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);} | |
788 | if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);} | |
a9a2d814 | 789 | for (Int_t i=0; i<12; i++) { |
61ab8ea8 | 790 | if (TMath::Abs(z-3.9*(i+0.5))<0.15) { |
791 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
792 | d+=0.0034; | |
793 | break; | |
794 | } | |
795 | if (TMath::Abs(z+3.9*(i+0.5))<0.15) { | |
796 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
797 | d+=0.0034; | |
798 | break; | |
799 | } | |
800 | if (TMath::Abs(z-3.4-3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
801 | if (TMath::Abs(z+0.5+3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
a9a2d814 | 802 | } |
803 | } else | |
804 | if (37<fR&&fR<41) { //SSD1 | |
61ab8ea8 | 805 | Double_t dd=0.0034; |
806 | d=dd; | |
807 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
808 | if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);} | |
809 | if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);} | |
a9a2d814 | 810 | for (Int_t i=0; i<11; i++) { |
61ab8ea8 | 811 | if (TMath::Abs(z-3.9*i)<0.15) { |
812 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
813 | d+=dd; | |
814 | break; | |
815 | } | |
816 | if (TMath::Abs(z+3.9*i)<0.15) { | |
817 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
818 | d+=dd; | |
819 | break; | |
820 | } | |
821 | if (TMath::Abs(z-1.85-3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
822 | if (TMath::Abs(z+2.05+3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
a9a2d814 | 823 | } |
824 | } else | |
825 | if (13<fR&&fR<26) { //SDD | |
61ab8ea8 | 826 | Double_t dd=0.0033; |
827 | d=dd; | |
828 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
829 | ||
830 | if (TMath::Abs(y-1.80)<0.55) { | |
831 | d+=0.016; | |
832 | for (Int_t j=0; j<20; j++) { | |
833 | if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
834 | if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
835 | } | |
836 | } | |
837 | if (TMath::Abs(y+1.80)<0.55) { | |
838 | d+=0.016; | |
839 | for (Int_t j=0; j<20; j++) { | |
840 | if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
841 | if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
842 | } | |
843 | } | |
844 | ||
845 | for (Int_t i=0; i<4; i++) { | |
846 | if (TMath::Abs(z-7.3*i)<0.60) { | |
847 | d+=dd; | |
848 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
849 | break; | |
850 | } | |
851 | if (TMath::Abs(z+7.3*i)<0.60) { | |
852 | d+=dd; | |
853 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
854 | break; | |
855 | } | |
a9a2d814 | 856 | } |
857 | } else | |
858 | if (6<fR&&fR<8) { //SPD2 | |
61ab8ea8 | 859 | Double_t dd=0.0063; x0=21.5; |
860 | d=dd; | |
861 | if (TMath::Abs(y-3.08)>0.5) d+=dd; | |
862 | //if (TMath::Abs(y-3.08)>0.45) d+=dd; | |
863 | if (TMath::Abs(y-3.03)<0.10) {d+=0.014;} | |
a9a2d814 | 864 | } else |
865 | if (3<fR&&fR<5) { //SPD1 | |
61ab8ea8 | 866 | Double_t dd=0.0063; x0=21.5; |
867 | d=dd; | |
868 | if (TMath::Abs(y+0.21)>0.6) d+=dd; | |
869 | //if (TMath::Abs(y+0.21)>0.45) d+=dd; | |
870 | if (TMath::Abs(y+0.10)<0.10) {d+=0.014;} | |
a9a2d814 | 871 | } |
872 | ||
a9a2d814 | 873 | return d; |
874 | } | |
006b5f7f | 875 | |
a9a2d814 | 876 | Double_t AliITStrackerV2::GetEffectiveThickness(Double_t y,Double_t z) const |
006b5f7f | 877 | { |
878 | //-------------------------------------------------------------------- | |
a9a2d814 | 879 | //Returns the thickness between the current layer and the vertex (units X0) |
006b5f7f | 880 | //-------------------------------------------------------------------- |
61ab8ea8 | 881 | Double_t d=0.0028*3*3; //beam pipe |
882 | Double_t x0=0; | |
006b5f7f | 883 | |
18856a77 | 884 | Double_t xn=fgLayers[fI].GetR(); |
006b5f7f | 885 | for (Int_t i=0; i<fI; i++) { |
18856a77 | 886 | Double_t xi=fgLayers[i].GetR(); |
887 | d+=fgLayers[i].GetThickness(y,z,x0)*xi*xi; | |
006b5f7f | 888 | } |
889 | ||
890 | if (fI>1) { | |
61ab8ea8 | 891 | Double_t xi=9.; |
892 | d+=0.0097*xi*xi; | |
006b5f7f | 893 | } |
894 | ||
895 | if (fI>3) { | |
18856a77 | 896 | Double_t xi=0.5*(fgLayers[3].GetR()+fgLayers[4].GetR()); |
61ab8ea8 | 897 | d+=0.0034*xi*xi; |
006b5f7f | 898 | } |
61ab8ea8 | 899 | |
006b5f7f | 900 | return d/(xn*xn); |
901 | } | |
902 | ||
880f41b9 | 903 | Bool_t |
c630aafd | 904 | AliITStrackerV2::RefitAt(Double_t xx,AliITStrackV2 *t,const AliITStrackV2 *c) { |
4ab260d6 | 905 | //-------------------------------------------------------------------- |
c630aafd | 906 | // This function refits the track "t" at the position "x" using |
907 | // the clusters from "c" | |
4ab260d6 | 908 | //-------------------------------------------------------------------- |
880f41b9 | 909 | Int_t index[kMaxLayer]; |
910 | Int_t k; | |
911 | for (k=0; k<kMaxLayer; k++) index[k]=-1; | |
c630aafd | 912 | Int_t nc=c->GetNumberOfClusters(); |
880f41b9 | 913 | for (k=0; k<nc; k++) { |
c630aafd | 914 | Int_t idx=c->GetClusterIndex(k),nl=(idx&0xf0000000)>>28; |
880f41b9 | 915 | index[nl]=idx; |
916 | } | |
880f41b9 | 917 | |
4ab260d6 | 918 | Int_t from, to, step; |
ee34184f | 919 | if (xx > t->GetX()) { |
4ab260d6 | 920 | from=0; to=kMaxLayer; |
921 | step=+1; | |
922 | } else { | |
923 | from=kMaxLayer-1; to=-1; | |
924 | step=-1; | |
925 | } | |
926 | ||
927 | for (Int_t i=from; i != to; i += step) { | |
18856a77 | 928 | AliITSlayer &layer=fgLayers[i]; |
4ab260d6 | 929 | Double_t r=layer.GetR(); |
930 | ||
931 | { | |
932 | Double_t hI=i-0.5*step; | |
880f41b9 | 933 | if (TMath::Abs(hI-1.5)<0.01 || TMath::Abs(hI-3.5)<0.01) { |
18856a77 | 934 | Double_t rs=0.5*(fgLayers[i-step].GetR() + r); |
61ab8ea8 | 935 | Double_t d=0.0034, x0=38.6; |
880f41b9 | 936 | if (TMath::Abs(hI-1.5)<0.01) {rs=9.; d=0.0097; x0=42;} |
937 | if (!t->PropagateTo(rs,-step*d,x0)) { | |
4ab260d6 | 938 | return kFALSE; |
939 | } | |
940 | } | |
941 | } | |
942 | ||
880f41b9 | 943 | // remember old position [SR, GSI 18.02.2003] |
944 | Double_t oldX=0., oldY=0., oldZ=0.; | |
945 | if (t->IsStartedTimeIntegral() && step==1) { | |
946 | t->GetGlobalXYZat(t->GetX(),oldX,oldY,oldZ); | |
947 | } | |
948 | // | |
949 | ||
4ab260d6 | 950 | Double_t x,y,z; |
951 | if (!t->GetGlobalXYZat(r,x,y,z)) { | |
952 | return kFALSE; | |
953 | } | |
954 | Double_t phi=TMath::ATan2(y,x); | |
955 | Int_t idet=layer.FindDetectorIndex(phi,z); | |
956 | if (idet<0) { | |
957 | return kFALSE; | |
958 | } | |
959 | const AliITSdetector &det=layer.GetDetector(idet); | |
960 | phi=det.GetPhi(); | |
961 | if (!t->Propagate(phi,det.GetR())) { | |
962 | return kFALSE; | |
963 | } | |
964 | t->SetDetectorIndex(idet); | |
965 | ||
00a7cc50 | 966 | const AliITSRecPoint *cl=0; |
4ab260d6 | 967 | Double_t maxchi2=kMaxChi2; |
968 | ||
969 | Int_t idx=index[i]; | |
970 | if (idx>0) { | |
00a7cc50 | 971 | const AliITSRecPoint *c=(AliITSRecPoint *)GetCluster(idx); |
4ab260d6 | 972 | if (idet != c->GetDetectorIndex()) { |
973 | idet=c->GetDetectorIndex(); | |
974 | const AliITSdetector &det=layer.GetDetector(idet); | |
975 | if (!t->Propagate(det.GetPhi(),det.GetR())) { | |
976 | return kFALSE; | |
977 | } | |
978 | t->SetDetectorIndex(idet); | |
979 | } | |
980 | Double_t chi2=t->GetPredictedChi2(c); | |
c630aafd | 981 | if (chi2<maxchi2) { |
982 | cl=c; | |
983 | maxchi2=chi2; | |
984 | } else { | |
985 | return kFALSE; | |
986 | } | |
4ab260d6 | 987 | } |
4ab260d6 | 988 | /* |
989 | if (cl==0) | |
990 | if (t->GetNumberOfClusters()>2) { | |
991 | Double_t dz=4*TMath::Sqrt(t->GetSigmaZ2()+kSigmaZ2[i]); | |
992 | Double_t dy=4*TMath::Sqrt(t->GetSigmaY2()+kSigmaY2[i]); | |
993 | Double_t zmin=t->GetZ() - dz; | |
994 | Double_t zmax=t->GetZ() + dz; | |
995 | Double_t ymin=t->GetY() + phi*r - dy; | |
996 | Double_t ymax=t->GetY() + phi*r + dy; | |
997 | layer.SelectClusters(zmin,zmax,ymin,ymax); | |
998 | ||
00a7cc50 | 999 | const AliITSRecPoint *c=0; Int_t ci=-1; |
4ab260d6 | 1000 | while ((c=layer.GetNextCluster(ci))!=0) { |
1001 | if (idet != c->GetDetectorIndex()) continue; | |
1002 | Double_t chi2=t->GetPredictedChi2(c); | |
1003 | if (chi2<maxchi2) { cl=c; maxchi2=chi2; idx=ci; } | |
1004 | } | |
1005 | } | |
1006 | */ | |
4ab260d6 | 1007 | if (cl) { |
1008 | if (!t->Update(cl,maxchi2,idx)) { | |
1009 | return kFALSE; | |
1010 | } | |
880f41b9 | 1011 | t->SetSampledEdx(cl->GetQ(),t->GetNumberOfClusters()-1); |
4ab260d6 | 1012 | } |
1013 | ||
1014 | { | |
61ab8ea8 | 1015 | Double_t x0; |
1016 | Double_t d=layer.GetThickness(t->GetY(),t->GetZ(),x0); | |
1017 | t->CorrectForMaterial(-step*d,x0); | |
4ab260d6 | 1018 | } |
880f41b9 | 1019 | |
1020 | // track time update [SR, GSI 17.02.2003] | |
1021 | if (t->IsStartedTimeIntegral() && step==1) { | |
1022 | Double_t newX, newY, newZ; | |
1023 | t->GetGlobalXYZat(t->GetX(),newX,newY,newZ); | |
1024 | Double_t dL2 = (oldX-newX)*(oldX-newX) + (oldY-newY)*(oldY-newY) + | |
1025 | (oldZ-newZ)*(oldZ-newZ); | |
1026 | t->AddTimeStep(TMath::Sqrt(dL2)); | |
1027 | } | |
1028 | // | |
4ab260d6 | 1029 | |
1030 | } | |
1031 | ||
ee34184f | 1032 | if (!t->PropagateTo(xx,0.,0.)) return kFALSE; |
4ab260d6 | 1033 | return kTRUE; |
1034 | } | |
1035 | ||
b87bd7cd | 1036 | void AliITStrackerV2::UseClusters(const AliKalmanTrack *t, Int_t from) const { |
1037 | //-------------------------------------------------------------------- | |
1038 | // This function marks clusters assigned to the track | |
1039 | //-------------------------------------------------------------------- | |
1040 | AliTracker::UseClusters(t,from); | |
880f41b9 | 1041 | |
00a7cc50 | 1042 | AliITSRecPoint *c=(AliITSRecPoint *)GetCluster(t->GetClusterIndex(0)); |
d920bdee | 1043 | if (c && c->GetSigmaZ2()>0.1) c->UnUse(); |
00a7cc50 | 1044 | c=(AliITSRecPoint *)GetCluster(t->GetClusterIndex(1)); |
d920bdee | 1045 | if (c && c->GetSigmaZ2()>0.1) c->UnUse(); |
880f41b9 | 1046 | |
b87bd7cd | 1047 | } |