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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 | ||
75fb37cc | 26 | #include <TError.h> |
006b5f7f | 27 | #include <TFile.h> |
28 | #include <TTree.h> | |
29 | #include <TRandom.h> | |
a504d56f | 30 | #include <TGeoMatrix.h> |
006b5f7f | 31 | |
e341247d | 32 | #include "AliITSgeomTGeo.h" |
a504d56f | 33 | #include "AliAlignObj.h" |
006b5f7f | 34 | #include "AliITSRecPoint.h" |
c630aafd | 35 | #include "AliESD.h" |
00a7cc50 | 36 | #include "AliITSRecPoint.h" |
006b5f7f | 37 | #include "AliITStrackerV2.h" |
38 | ||
8676d691 | 39 | ClassImp(AliITStrackerV2) |
006b5f7f | 40 | |
a504d56f | 41 | AliITStrackerV2::AliITSlayer AliITStrackerV2::fgLayers[kMaxLayer]; //ITS layers |
006b5f7f | 42 | |
6c94f330 | 43 | AliITStrackerV2::AliITStrackerV2(): |
44 | AliTracker(), | |
45 | fI(kMaxLayer), | |
46 | fBestTrack(), | |
47 | fTrackToFollow(), | |
48 | fPass(0), | |
49 | fLastLayerToTrackTo(kLastLayerToTrackTo) | |
50 | { | |
51 | //-------------------------------------------------------------------- | |
52 | //This is the AliITStrackerV2 default constructor | |
53 | //-------------------------------------------------------------------- | |
54 | ||
55 | for (Int_t i=1; i<kMaxLayer+1; i++) new(fgLayers+i-1) AliITSlayer(); | |
56 | ||
57 | fConstraint[0]=1; fConstraint[1]=0; | |
58 | ||
59 | Double_t xyz[]={kXV,kYV,kZV}, ers[]={kSigmaXV,kSigmaYV,kSigmaZV}; | |
60 | SetVertex(xyz,ers); | |
61 | ||
62 | for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=kLayersNotToSkip[i]; | |
63 | ||
64 | } | |
65 | ||
66 | AliITStrackerV2::AliITStrackerV2(const AliITStrackerV2 &t): | |
67 | AliTracker(t), | |
68 | fI(t.fI), | |
69 | fBestTrack(t.fBestTrack), | |
70 | fTrackToFollow(t.fTrackToFollow), | |
71 | fPass(t.fPass), | |
72 | fLastLayerToTrackTo(t.fLastLayerToTrackTo) | |
73 | { | |
74 | //-------------------------------------------------------------------- | |
75 | //This is the AliITStrackerV2 copy constructor | |
76 | //-------------------------------------------------------------------- | |
77 | ||
78 | //for (Int_t i=1; i<kMaxLayer+1; i++) new(fgLayers+i-1) AliITSlayer(); | |
79 | ||
80 | fConstraint[0]=t.fConstraint[0]; fConstraint[1]=t.fConstraint[1]; | |
81 | ||
82 | Double_t xyz[]={kXV,kYV,kZV}, ers[]={kSigmaXV,kSigmaYV,kSigmaZV}; | |
83 | xyz[0]=t.GetX(); xyz[1]=t.GetY(); xyz[2]=t.GetZ(); | |
84 | ers[0]=t.GetSigmaX(); ers[1]=t.GetSigmaY(); ers[2]=t.GetSigmaZ(); | |
85 | SetVertex(xyz,ers); | |
86 | ||
87 | for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=t.fLayersNotToSkip[i]; | |
88 | ||
89 | } | |
90 | ||
1f3e997f | 91 | AliITStrackerV2::AliITStrackerV2(const Char_t *geom) : |
6c94f330 | 92 | AliTracker(), |
93 | fI(kMaxLayer), | |
94 | fBestTrack(), | |
95 | fTrackToFollow(), | |
96 | fPass(0), | |
97 | fLastLayerToTrackTo(kLastLayerToTrackTo) | |
98 | { | |
006b5f7f | 99 | //-------------------------------------------------------------------- |
61ab8ea8 | 100 | //This is the AliITStrackerV2 constructor |
006b5f7f | 101 | //-------------------------------------------------------------------- |
e341247d | 102 | if (geom) { |
103 | AliWarning("\"geom\" is actually a dummy argument !"); | |
104 | } | |
006b5f7f | 105 | |
e341247d | 106 | for (Int_t i=1; i<kMaxLayer+1; i++) { |
107 | Int_t nlad=AliITSgeomTGeo::GetNLadders(i); | |
108 | Int_t ndet=AliITSgeomTGeo::GetNDetectors(i); | |
006b5f7f | 109 | |
e341247d | 110 | Double_t xyz[3], &x=xyz[0], &y=xyz[1], &z=xyz[2]; |
111 | AliITSgeomTGeo::GetOrigTranslation(i,1,1,xyz); | |
006b5f7f | 112 | Double_t poff=TMath::ATan2(y,x); |
113 | Double_t zoff=z; | |
a504d56f | 114 | Double_t r=TMath::Sqrt(x*x + y*y); |
006b5f7f | 115 | |
e341247d | 116 | AliITSgeomTGeo::GetOrigTranslation(i,1,2,xyz); |
006b5f7f | 117 | r += TMath::Sqrt(x*x + y*y); |
e341247d | 118 | AliITSgeomTGeo::GetOrigTranslation(i,2,1,xyz); |
006b5f7f | 119 | r += TMath::Sqrt(x*x + y*y); |
e341247d | 120 | AliITSgeomTGeo::GetOrigTranslation(i,2,2,xyz); |
006b5f7f | 121 | r += TMath::Sqrt(x*x + y*y); |
122 | r*=0.25; | |
123 | ||
18856a77 | 124 | new (fgLayers+i-1) AliITSlayer(r,poff,zoff,nlad,ndet); |
006b5f7f | 125 | |
126 | for (Int_t j=1; j<nlad+1; j++) { | |
127 | for (Int_t k=1; k<ndet+1; k++) { //Fill this layer with detectors | |
e341247d | 128 | TGeoHMatrix m; AliITSgeomTGeo::GetOrigMatrix(i,j,k,m); |
1f3e997f | 129 | const TGeoHMatrix *tm=AliITSgeomTGeo::GetTracking2LocalMatrix(i,j,k); |
130 | m.Multiply(tm); | |
131 | Double_t txyz[3]={0.}, xyz[3]={0.}; | |
132 | m.LocalToMaster(txyz,xyz); | |
133 | Double_t r=TMath::Sqrt(xyz[0]*xyz[0] + xyz[1]*xyz[1]); | |
134 | Double_t phi=TMath::ATan2(xyz[1],xyz[0]); | |
c219fd63 | 135 | |
136 | if (phi<0) phi+=TMath::TwoPi(); | |
137 | else if (phi>=TMath::TwoPi()) phi-=TMath::TwoPi(); | |
138 | ||
18856a77 | 139 | AliITSdetector &det=fgLayers[i-1].GetDetector((j-1)*ndet + k-1); |
006b5f7f | 140 | new(&det) AliITSdetector(r,phi); |
141 | } | |
142 | } | |
c630aafd | 143 | |
006b5f7f | 144 | } |
145 | ||
c219fd63 | 146 | fConstraint[0]=1; fConstraint[1]=0; |
8676d691 | 147 | |
148 | Double_t xyz[]={kXV,kYV,kZV}, ers[]={kSigmaXV,kSigmaYV,kSigmaZV}; | |
149 | SetVertex(xyz,ers); | |
c0dd5278 | 150 | |
151 | for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=kLayersNotToSkip[i]; | |
c0dd5278 | 152 | |
153 | } | |
154 | ||
155 | void AliITStrackerV2::SetLayersNotToSkip(Int_t *l) { | |
156 | //-------------------------------------------------------------------- | |
157 | //This function set masks of the layers which must be not skipped | |
158 | //-------------------------------------------------------------------- | |
159 | for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=l[i]; | |
61ab8ea8 | 160 | } |
006b5f7f | 161 | |
c630aafd | 162 | Int_t AliITStrackerV2::LoadClusters(TTree *cTree) { |
61ab8ea8 | 163 | //-------------------------------------------------------------------- |
164 | //This function loads ITS clusters | |
165 | //-------------------------------------------------------------------- | |
00a7cc50 | 166 | TBranch *branch=cTree->GetBranch("ITSRecPoints"); |
61ab8ea8 | 167 | if (!branch) { |
c630aafd | 168 | Error("LoadClusters"," can't get the branch !\n"); |
8676d691 | 169 | return 1; |
61ab8ea8 | 170 | } |
006b5f7f | 171 | |
00a7cc50 | 172 | TClonesArray dummy("AliITSRecPoint",10000), *clusters=&dummy; |
61ab8ea8 | 173 | branch->SetAddress(&clusters); |
006b5f7f | 174 | |
61ab8ea8 | 175 | Int_t j=0; |
176 | for (Int_t i=0; i<kMaxLayer; i++) { | |
18856a77 | 177 | Int_t ndet=fgLayers[i].GetNdetectors(); |
178 | Int_t jmax = j + fgLayers[i].GetNladders()*ndet; | |
c219fd63 | 179 | |
180 | Double_t r=fgLayers[i].GetR(); | |
181 | Double_t circ=TMath::TwoPi()*r; | |
182 | ||
61ab8ea8 | 183 | for (; j<jmax; j++) { |
184 | if (!cTree->GetEvent(j)) continue; | |
185 | Int_t ncl=clusters->GetEntriesFast(); | |
1f3e997f | 186 | |
61ab8ea8 | 187 | while (ncl--) { |
00a7cc50 | 188 | AliITSRecPoint *c=(AliITSRecPoint*)clusters->UncheckedAt(ncl); |
c219fd63 | 189 | |
75fb37cc | 190 | if (!c->Misalign()) AliWarning("Can't misalign this cluster !"); |
1f3e997f | 191 | |
c219fd63 | 192 | Int_t idx=c->GetDetectorIndex(); |
a504d56f | 193 | AliITSdetector &det=fgLayers[i].GetDetector(idx); |
194 | ||
a504d56f | 195 | Double_t y=r*det.GetPhi()+c->GetY(); |
c219fd63 | 196 | if (y>circ) y-=circ; else if (y<0) y+=circ; |
197 | c->SetPhiR(y); | |
198 | ||
00a7cc50 | 199 | fgLayers[i].InsertCluster(new AliITSRecPoint(*c)); |
61ab8ea8 | 200 | } |
201 | clusters->Delete(); | |
202 | } | |
18856a77 | 203 | fgLayers[i].ResetRoad(); //road defined by the cluster density |
006b5f7f | 204 | } |
c630aafd | 205 | |
8676d691 | 206 | return 0; |
61ab8ea8 | 207 | } |
006b5f7f | 208 | |
61ab8ea8 | 209 | void AliITStrackerV2::UnloadClusters() { |
210 | //-------------------------------------------------------------------- | |
211 | //This function unloads ITS clusters | |
212 | //-------------------------------------------------------------------- | |
18856a77 | 213 | for (Int_t i=0; i<kMaxLayer; i++) fgLayers[i].ResetClusters(); |
006b5f7f | 214 | } |
215 | ||
880f41b9 | 216 | static Int_t CorrectForDeadZoneMaterial(AliITStrackV2 *t) { |
217 | //-------------------------------------------------------------------- | |
218 | // Correction for the material between the TPC and the ITS | |
219 | // (should it belong to the TPC code ?) | |
220 | //-------------------------------------------------------------------- | |
221 | Double_t riw=80., diw=0.0053, x0iw=30; // TPC inner wall ? | |
222 | Double_t rcd=61., dcd=0.0053, x0cd=30; // TPC "central drum" ? | |
223 | Double_t yr=12.8, dr=0.03; // rods ? | |
224 | Double_t zm=0.2, dm=0.40; // membrane | |
225 | //Double_t rr=52., dr=0.19, x0r=24., yyr=7.77; //rails | |
226 | Double_t rs=50., ds=0.001; // something belonging to the ITS (screen ?) | |
227 | ||
228 | if (t->GetX() > riw) { | |
229 | if (!t->PropagateTo(riw,diw,x0iw)) return 1; | |
230 | if (TMath::Abs(t->GetY())>yr) t->CorrectForMaterial(dr); | |
231 | if (TMath::Abs(t->GetZ())<zm) t->CorrectForMaterial(dm); | |
232 | if (!t->PropagateTo(rcd,dcd,x0cd)) return 1; | |
233 | //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z); | |
234 | //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,dr,x0r); | |
235 | if (!t->PropagateTo(rs,ds)) return 1; | |
236 | } else if (t->GetX() < rs) { | |
237 | if (!t->PropagateTo(rs,-ds)) return 1; | |
238 | //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z); | |
239 | //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,-dr,x0r); | |
240 | if (!t->PropagateTo(rcd,-dcd,x0cd)) return 1; | |
ba1a3e1a | 241 | if (!t->PropagateTo(riw+0.001,-diw,x0iw)) return 1; |
880f41b9 | 242 | } else { |
243 | ::Error("CorrectForDeadZoneMaterial","track is already in the dead zone !"); | |
244 | return 1; | |
245 | } | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
c630aafd | 250 | Int_t AliITStrackerV2::Clusters2Tracks(AliESD *event) { |
006b5f7f | 251 | //-------------------------------------------------------------------- |
c630aafd | 252 | // This functions reconstructs ITS tracks |
253 | // The clusters must be already loaded ! | |
006b5f7f | 254 | //-------------------------------------------------------------------- |
c630aafd | 255 | TObjArray itsTracks(15000); |
006b5f7f | 256 | |
c630aafd | 257 | {/* Read ESD tracks */ |
258 | Int_t nentr=event->GetNumberOfTracks(); | |
259 | Info("Clusters2Tracks", "Number of ESD tracks: %d\n", nentr); | |
260 | while (nentr--) { | |
261 | AliESDtrack *esd=event->GetTrack(nentr); | |
262 | ||
ba1a3e1a | 263 | if ((esd->GetStatus()&AliESDtrack::kTPCin)==0) continue; |
264 | if (esd->GetStatus()&AliESDtrack::kTPCout) continue; | |
265 | if (esd->GetStatus()&AliESDtrack::kITSin) continue; | |
c630aafd | 266 | |
267 | AliITStrackV2 *t=0; | |
268 | try { | |
269 | t=new AliITStrackV2(*esd); | |
270 | } catch (const Char_t *msg) { | |
271 | Warning("Clusters2Tracks",msg); | |
272 | delete t; | |
273 | continue; | |
274 | } | |
6c94f330 | 275 | if (TMath::Abs(t->GetD(GetX(),GetY()))>4) { |
ebd8369c | 276 | delete t; |
277 | continue; | |
278 | } | |
006b5f7f | 279 | |
c630aafd | 280 | if (CorrectForDeadZoneMaterial(t)!=0) { |
281 | Warning("Clusters2Tracks", | |
282 | "failed to correct for the material in the dead zone !\n"); | |
283 | delete t; | |
284 | continue; | |
285 | } | |
286 | itsTracks.AddLast(t); | |
287 | } | |
288 | } /* End Read ESD tracks */ | |
289 | ||
290 | itsTracks.Sort(); | |
291 | Int_t nentr=itsTracks.GetEntriesFast(); | |
15dd636f | 292 | |
c630aafd | 293 | Int_t ntrk=0; |
294 | for (fPass=0; fPass<2; fPass++) { | |
295 | Int_t &constraint=fConstraint[fPass]; if (constraint<0) continue; | |
296 | for (Int_t i=0; i<nentr; i++) { | |
297 | AliITStrackV2 *t=(AliITStrackV2*)itsTracks.UncheckedAt(i); | |
15dd636f | 298 | if (t==0) continue; //this track has been already tracked |
c630aafd | 299 | Int_t tpcLabel=t->GetLabel(); //save the TPC track label |
300 | ||
301 | ResetTrackToFollow(*t); | |
302 | ResetBestTrack(); | |
303 | ||
304 | for (FollowProlongation(); fI<kMaxLayer; fI++) { | |
15dd636f | 305 | while (TakeNextProlongation()) FollowProlongation(); |
c630aafd | 306 | } |
307 | ||
de5d3595 | 308 | if (fBestTrack.GetNumberOfClusters() == 0) continue; |
15dd636f | 309 | |
c630aafd | 310 | if (fConstraint[fPass]) { |
15dd636f | 311 | ResetTrackToFollow(*t); |
312 | if (!RefitAt(3.7, &fTrackToFollow, &fBestTrack)) continue; | |
313 | ResetBestTrack(); | |
314 | } | |
315 | ||
c630aafd | 316 | fBestTrack.SetLabel(tpcLabel); |
317 | fBestTrack.CookdEdx(); | |
318 | CookLabel(&fBestTrack,0.); //For comparison only | |
319 | fBestTrack.UpdateESDtrack(AliESDtrack::kITSin); | |
15dd636f | 320 | UseClusters(&fBestTrack); |
c630aafd | 321 | delete itsTracks.RemoveAt(i); |
322 | ntrk++; | |
323 | } | |
324 | } | |
babd135a | 325 | |
c630aafd | 326 | itsTracks.Delete(); |
2257f27e | 327 | |
c630aafd | 328 | Info("Clusters2Tracks","Number of prolonged tracks: %d\n",ntrk); |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
c630aafd | 333 | Int_t AliITStrackerV2::PropagateBack(AliESD *event) { |
334 | //-------------------------------------------------------------------- | |
335 | // This functions propagates reconstructed ITS tracks back | |
336 | // The clusters must be loaded ! | |
337 | //-------------------------------------------------------------------- | |
338 | Int_t nentr=event->GetNumberOfTracks(); | |
339 | Info("PropagateBack", "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::kITSin)==0) continue; |
346 | if (esd->GetStatus()&AliESDtrack::kITSout) continue; | |
c630aafd | 347 | |
348 | AliITStrackV2 *t=0; | |
349 | try { | |
350 | t=new AliITStrackV2(*esd); | |
351 | } catch (const Char_t *msg) { | |
352 | Warning("PropagateBack",msg); | |
353 | delete t; | |
354 | continue; | |
355 | } | |
356 | ||
357 | ResetTrackToFollow(*t); | |
358 | ||
359 | // propagete to vertex [SR, GSI 17.02.2003] | |
a9459f9c | 360 | // Start Time measurement [SR, GSI 17.02.2003], corrected by I.Belikov |
361 | if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) { | |
6c94f330 | 362 | if (fTrackToFollow.PropagateToVertex(event->GetVertex())) { |
a9459f9c | 363 | fTrackToFollow.StartTimeIntegral(); |
364 | } | |
365 | fTrackToFollow.PropagateTo(3.,-0.0028,65.19); | |
366 | } | |
c630aafd | 367 | |
6c94f330 | 368 | fTrackToFollow.ResetCovariance(10.); fTrackToFollow.ResetClusters(); |
c630aafd | 369 | if (RefitAt(49.,&fTrackToFollow,t)) { |
370 | if (CorrectForDeadZoneMaterial(&fTrackToFollow)!=0) { | |
371 | Warning("PropagateBack", | |
372 | "failed to correct for the material in the dead zone !\n"); | |
373 | delete t; | |
374 | continue; | |
375 | } | |
376 | fTrackToFollow.SetLabel(t->GetLabel()); | |
ba1a3e1a | 377 | //fTrackToFollow.CookdEdx(); |
c630aafd | 378 | CookLabel(&fTrackToFollow,0.); //For comparison only |
379 | fTrackToFollow.UpdateESDtrack(AliESDtrack::kITSout); | |
15dd636f | 380 | UseClusters(&fTrackToFollow); |
c630aafd | 381 | ntrk++; |
382 | } | |
383 | delete t; | |
384 | } | |
385 | ||
386 | Info("PropagateBack","Number of back propagated ITS tracks: %d\n",ntrk); | |
61ab8ea8 | 387 | |
83d73500 | 388 | return 0; |
389 | } | |
390 | ||
c630aafd | 391 | Int_t AliITStrackerV2::RefitInward(AliESD *event) { |
83d73500 | 392 | //-------------------------------------------------------------------- |
393 | // This functions refits ITS tracks using the | |
394 | // "inward propagated" TPC tracks | |
c630aafd | 395 | // The clusters must be loaded ! |
83d73500 | 396 | //-------------------------------------------------------------------- |
c630aafd | 397 | Int_t nentr=event->GetNumberOfTracks(); |
398 | Info("RefitInward", "Number of ESD tracks: %d\n", nentr); | |
399 | ||
400 | Int_t ntrk=0; | |
401 | for (Int_t i=0; i<nentr; i++) { | |
402 | AliESDtrack *esd=event->GetTrack(i); | |
403 | ||
ba1a3e1a | 404 | if ((esd->GetStatus()&AliESDtrack::kITSout) == 0) continue; |
405 | if (esd->GetStatus()&AliESDtrack::kITSrefit) continue; | |
406 | if (esd->GetStatus()&AliESDtrack::kTPCout) | |
15dd636f | 407 | if ((esd->GetStatus()&AliESDtrack::kTPCrefit)==0) continue; |
c630aafd | 408 | |
409 | AliITStrackV2 *t=0; | |
410 | try { | |
411 | t=new AliITStrackV2(*esd); | |
412 | } catch (const Char_t *msg) { | |
413 | Warning("RefitInward",msg); | |
414 | delete t; | |
415 | continue; | |
416 | } | |
417 | ||
418 | if (CorrectForDeadZoneMaterial(t)!=0) { | |
419 | Warning("RefitInward", | |
420 | "failed to correct for the material in the dead zone !\n"); | |
421 | delete t; | |
422 | continue; | |
423 | } | |
424 | ||
425 | ResetTrackToFollow(*t); | |
426 | fTrackToFollow.ResetClusters(); | |
427 | ||
428 | //Refitting... | |
ef7253ac | 429 | if (RefitAt(3.7, &fTrackToFollow, t, kTRUE)) { |
c630aafd | 430 | fTrackToFollow.SetLabel(t->GetLabel()); |
431 | fTrackToFollow.CookdEdx(); | |
15dd636f | 432 | CookLabel(&fTrackToFollow,0.); //For comparison only |
18856a77 | 433 | |
49d13e89 | 434 | if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) {//The beam pipe |
435 | AliESDtrack *esdTrack =fTrackToFollow.GetESDtrack(); | |
436 | esdTrack->UpdateTrackParams(&fTrackToFollow,AliESDtrack::kITSrefit); | |
437 | Float_t r[3]={0.,0.,0.}; | |
438 | Double_t maxD=3.; | |
439 | esdTrack->RelateToVertex(event->GetVertex(),GetBz(r),maxD); | |
440 | ntrk++; | |
67c3dcbe | 441 | } |
c630aafd | 442 | } |
443 | delete t; | |
444 | } | |
445 | ||
446 | Info("RefitInward","Number of refitted tracks: %d\n",ntrk); | |
83d73500 | 447 | |
c630aafd | 448 | return 0; |
449 | } | |
83d73500 | 450 | |
006b5f7f | 451 | AliCluster *AliITStrackerV2::GetCluster(Int_t index) const { |
452 | //-------------------------------------------------------------------- | |
453 | // Return pointer to a given cluster | |
454 | //-------------------------------------------------------------------- | |
455 | Int_t l=(index & 0xf0000000) >> 28; | |
456 | Int_t c=(index & 0x0fffffff) >> 00; | |
18856a77 | 457 | return fgLayers[l].GetCluster(c); |
006b5f7f | 458 | } |
459 | ||
460 | ||
461 | void AliITStrackerV2::FollowProlongation() { | |
462 | //-------------------------------------------------------------------- | |
463 | //This function finds a track prolongation | |
464 | //-------------------------------------------------------------------- | |
c0dd5278 | 465 | while (fI>fLastLayerToTrackTo) { |
a9a2d814 | 466 | Int_t i=fI-1; |
8676d691 | 467 | |
18856a77 | 468 | AliITSlayer &layer=fgLayers[i]; |
a9a2d814 | 469 | AliITStrackV2 &track=fTracks[i]; |
006b5f7f | 470 | |
14825d5a | 471 | Double_t r=layer.GetR(); |
61ab8ea8 | 472 | |
a9a2d814 | 473 | if (i==3 || i==1) { |
18856a77 | 474 | Double_t rs=0.5*(fgLayers[i+1].GetR() + r); |
61ab8ea8 | 475 | Double_t d=0.0034, x0=38.6; |
476 | if (i==1) {rs=9.; d=0.0097; x0=42;} | |
477 | if (!fTrackToFollow.PropagateTo(rs,d,x0)) { | |
8676d691 | 478 | //Warning("FollowProlongation","propagation failed !\n"); |
c0dd5278 | 479 | return; |
a9a2d814 | 480 | } |
006b5f7f | 481 | } |
482 | ||
483 | //find intersection | |
8602c008 | 484 | Double_t phi,z; |
485 | if (!fTrackToFollow.GetPhiZat(r,phi,z)) { | |
8676d691 | 486 | //Warning("FollowProlongation","failed to estimate track !\n"); |
c0dd5278 | 487 | return; |
006b5f7f | 488 | } |
f363d377 | 489 | |
006b5f7f | 490 | Int_t idet=layer.FindDetectorIndex(phi,z); |
491 | if (idet<0) { | |
8676d691 | 492 | //Warning("FollowProlongation","failed to find a detector !\n"); |
c0dd5278 | 493 | return; |
006b5f7f | 494 | } |
495 | ||
496 | //propagate to the intersection | |
497 | const AliITSdetector &det=layer.GetDetector(idet); | |
14825d5a | 498 | phi=det.GetPhi(); |
a9a2d814 | 499 | if (!fTrackToFollow.Propagate(phi,det.GetR())) { |
8676d691 | 500 | //Warning("FollowProlongation","propagation failed !\n"); |
c0dd5278 | 501 | return; |
006b5f7f | 502 | } |
503 | fTrackToFollow.SetDetectorIndex(idet); | |
504 | ||
505 | //Select possible prolongations and store the current track estimation | |
506 | track.~AliITStrackV2(); new(&track) AliITStrackV2(fTrackToFollow); | |
8676d691 | 507 | Double_t dz=7*TMath::Sqrt(track.GetSigmaZ2() + kSigmaZ2[i]); |
508 | Double_t dy=7*TMath::Sqrt(track.GetSigmaY2() + kSigmaY2[i]); | |
509 | Double_t road=layer.GetRoad(); | |
510 | if (dz*dy>road*road) { | |
511 | Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd; | |
512 | dz=road*scz; dy=road*scy; | |
513 | } | |
b87bd7cd | 514 | |
515 | //Double_t dz=4*TMath::Sqrt(track.GetSigmaZ2() + kSigmaZ2[i]); | |
14825d5a | 516 | if (dz < 0.5*TMath::Abs(track.GetTgl())) dz=0.5*TMath::Abs(track.GetTgl()); |
7f6ddf58 | 517 | if (dz > kMaxRoad) { |
8676d691 | 518 | //Warning("FollowProlongation","too broad road in Z !\n"); |
c0dd5278 | 519 | return; |
006b5f7f | 520 | } |
a9a2d814 | 521 | |
15dd636f | 522 | if (TMath::Abs(fTrackToFollow.GetZ()-GetZ()) > r+dz) return; |
a9a2d814 | 523 | |
b87bd7cd | 524 | //Double_t dy=4*TMath::Sqrt(track.GetSigmaY2() + kSigmaY2[i]); |
14825d5a | 525 | if (dy < 0.5*TMath::Abs(track.GetSnp())) dy=0.5*TMath::Abs(track.GetSnp()); |
7f6ddf58 | 526 | if (dy > kMaxRoad) { |
8676d691 | 527 | //Warning("FollowProlongation","too broad road in Y !\n"); |
c0dd5278 | 528 | return; |
006b5f7f | 529 | } |
a9a2d814 | 530 | |
c219fd63 | 531 | fI--; |
532 | ||
7f6ddf58 | 533 | Double_t zmin=track.GetZ() - dz; |
006b5f7f | 534 | Double_t zmax=track.GetZ() + dz; |
14825d5a | 535 | Double_t ymin=track.GetY() + r*phi - dy; |
536 | Double_t ymax=track.GetY() + r*phi + dy; | |
c219fd63 | 537 | if (layer.SelectClusters(zmin,zmax,ymin,ymax)==0) |
538 | if (fLayersNotToSkip[fI]) return; | |
006b5f7f | 539 | |
15dd636f | 540 | if (!TakeNextProlongation()) |
541 | if (fLayersNotToSkip[fI]) return; | |
542 | ||
006b5f7f | 543 | } |
544 | ||
545 | //deal with the best track | |
546 | Int_t ncl=fTrackToFollow.GetNumberOfClusters(); | |
547 | Int_t nclb=fBestTrack.GetNumberOfClusters(); | |
15dd636f | 548 | if (ncl) |
549 | if (ncl >= nclb) { | |
550 | Double_t chi2=fTrackToFollow.GetChi2(); | |
551 | if (chi2/ncl < kChi2PerCluster) { | |
552 | if (ncl > nclb || chi2 < fBestTrack.GetChi2()) { | |
553 | ResetBestTrack(); | |
006b5f7f | 554 | } |
15dd636f | 555 | } |
006b5f7f | 556 | } |
15dd636f | 557 | |
006b5f7f | 558 | } |
559 | ||
006b5f7f | 560 | Int_t AliITStrackerV2::TakeNextProlongation() { |
561 | //-------------------------------------------------------------------- | |
a9a2d814 | 562 | // This function takes another track prolongation |
563 | // | |
564 | // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch | |
006b5f7f | 565 | //-------------------------------------------------------------------- |
18856a77 | 566 | AliITSlayer &layer=fgLayers[fI]; |
4ab260d6 | 567 | ResetTrackToFollow(fTracks[fI]); |
006b5f7f | 568 | |
b87bd7cd | 569 | Double_t dz=7*TMath::Sqrt(fTrackToFollow.GetSigmaZ2() + kSigmaZ2[fI]); |
570 | Double_t dy=7*TMath::Sqrt(fTrackToFollow.GetSigmaY2() + kSigmaY2[fI]); | |
8676d691 | 571 | Double_t road=layer.GetRoad(); |
572 | if (dz*dy>road*road) { | |
573 | Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd; | |
574 | dz=road*scz; dy=road*scy; | |
575 | } | |
006b5f7f | 576 | |
00a7cc50 | 577 | const AliITSRecPoint *c=0; Int_t ci=-1; |
578 | const AliITSRecPoint *cc=0; Int_t cci=-1; | |
c219fd63 | 579 | Double_t chi2=kMaxChi2; |
006b5f7f | 580 | while ((c=layer.GetNextCluster(ci))!=0) { |
006b5f7f | 581 | Int_t idet=c->GetDetectorIndex(); |
15dd636f | 582 | |
4ab260d6 | 583 | if (fTrackToFollow.GetDetectorIndex()!=idet) { |
006b5f7f | 584 | const AliITSdetector &det=layer.GetDetector(idet); |
4ab260d6 | 585 | ResetTrackToFollow(fTracks[fI]); |
586 | if (!fTrackToFollow.Propagate(det.GetPhi(),det.GetR())) { | |
8676d691 | 587 | //Warning("TakeNextProlongation","propagation failed !\n"); |
006b5f7f | 588 | continue; |
589 | } | |
4ab260d6 | 590 | fTrackToFollow.SetDetectorIndex(idet); |
591 | if (TMath::Abs(fTrackToFollow.GetZ()-GetZ())>layer.GetR()+dz) continue; | |
006b5f7f | 592 | } |
593 | ||
4ab260d6 | 594 | if (TMath::Abs(fTrackToFollow.GetZ() - c->GetZ()) > dz) continue; |
595 | if (TMath::Abs(fTrackToFollow.GetY() - c->GetY()) > dy) continue; | |
006b5f7f | 596 | |
c219fd63 | 597 | Double_t ch2=fTrackToFollow.GetPredictedChi2(c); |
598 | if (ch2 > chi2) continue; | |
599 | chi2=ch2; | |
600 | cc=c; cci=ci; | |
601 | break; | |
006b5f7f | 602 | } |
603 | ||
c219fd63 | 604 | if (!cc) return 0; |
006b5f7f | 605 | |
1f3e997f | 606 | {// Take into account the mis-alignment |
607 | Double_t x = fTrackToFollow.GetX() + cc->GetX(); | |
608 | if (!fTrackToFollow.PropagateTo(x,0.,0.)) return 0; | |
609 | } | |
c219fd63 | 610 | if (!fTrackToFollow.Update(cc,chi2,(fI<<28)+cci)) { |
8676d691 | 611 | //Warning("TakeNextProlongation","filtering failed !\n"); |
006b5f7f | 612 | return 0; |
613 | } | |
15dd636f | 614 | |
4ab260d6 | 615 | if (fTrackToFollow.GetNumberOfClusters()>1) |
6c94f330 | 616 | if (TMath::Abs(fTrackToFollow.GetD(GetX(),GetY()))>4) return 0; |
4ab260d6 | 617 | |
a9a2d814 | 618 | fTrackToFollow. |
c219fd63 | 619 | SetSampledEdx(cc->GetQ(),fTrackToFollow.GetNumberOfClusters()-1); //b.b. |
a9a2d814 | 620 | |
621 | { | |
880f41b9 | 622 | Double_t x0; |
61ab8ea8 | 623 | Double_t d=layer.GetThickness(fTrackToFollow.GetY(),fTrackToFollow.GetZ(),x0); |
880f41b9 | 624 | fTrackToFollow.CorrectForMaterial(d,x0); |
a9a2d814 | 625 | } |
4ab260d6 | 626 | |
a9a2d814 | 627 | if (fConstraint[fPass]) { |
4ab260d6 | 628 | Double_t d=GetEffectiveThickness(0,0); //Think of this !!!! |
8676d691 | 629 | Double_t xyz[]={GetX(),GetY(),GetZ()}; |
630 | Double_t ers[]={GetSigmaX(),GetSigmaY(),GetSigmaZ()}; | |
631 | fTrackToFollow.Improve(d,xyz,ers); | |
a9a2d814 | 632 | } |
006b5f7f | 633 | |
006b5f7f | 634 | return 1; |
635 | } | |
636 | ||
637 | ||
6c94f330 | 638 | AliITStrackerV2::AliITSlayer::AliITSlayer(): |
639 | fR(0.), | |
640 | fPhiOffset(0.), | |
641 | fNladders(0), | |
642 | fZOffset(0.), | |
643 | fNdetectors(0), | |
644 | fDetectors(0), | |
645 | fNsel(0), | |
646 | fRoad(2*fR*TMath::Sqrt(3.14/1.)) //assuming that there's only one cluster | |
647 | { | |
006b5f7f | 648 | //-------------------------------------------------------------------- |
649 | //default AliITSlayer constructor | |
650 | //-------------------------------------------------------------------- | |
c219fd63 | 651 | |
652 | for (Int_t i=0; i<kNsector; i++) fN[i]=0; | |
c219fd63 | 653 | |
006b5f7f | 654 | } |
655 | ||
656 | AliITStrackerV2::AliITSlayer:: | |
6c94f330 | 657 | AliITSlayer(Double_t r,Double_t p,Double_t z,Int_t nl,Int_t nd): |
658 | fR(r), | |
659 | fPhiOffset(p), | |
660 | fNladders(nl), | |
661 | fZOffset(z), | |
662 | fNdetectors(nd), | |
663 | fDetectors(new AliITSdetector[nl*nd]), | |
664 | fNsel(0), | |
665 | fRoad(2*r*TMath::Sqrt(3.14/1.)) //assuming that there's only one cluster | |
666 | { | |
006b5f7f | 667 | //-------------------------------------------------------------------- |
668 | //main AliITSlayer constructor | |
669 | //-------------------------------------------------------------------- | |
006b5f7f | 670 | |
c219fd63 | 671 | for (Int_t i=0; i<kNsector; i++) fN[i]=0; |
c219fd63 | 672 | |
673 | for (Int_t i=0; i<kMaxClusterPerLayer; i++) fClusters[i]=0; | |
b87bd7cd | 674 | |
006b5f7f | 675 | } |
676 | ||
677 | AliITStrackerV2::AliITSlayer::~AliITSlayer() { | |
678 | //-------------------------------------------------------------------- | |
679 | // AliITSlayer destructor | |
680 | //-------------------------------------------------------------------- | |
681 | delete[] fDetectors; | |
c219fd63 | 682 | ResetClusters(); |
006b5f7f | 683 | } |
684 | ||
61ab8ea8 | 685 | void AliITStrackerV2::AliITSlayer::ResetClusters() { |
686 | //-------------------------------------------------------------------- | |
687 | // This function removes loaded clusters | |
688 | //-------------------------------------------------------------------- | |
c219fd63 | 689 | for (Int_t s=0; s<kNsector; s++) { |
690 | Int_t &n=fN[s]; | |
691 | while (n) { | |
692 | n--; | |
693 | delete fClusters[s*kMaxClusterPerSector+n]; | |
694 | } | |
695 | } | |
61ab8ea8 | 696 | } |
697 | ||
b87bd7cd | 698 | void AliITStrackerV2::AliITSlayer::ResetRoad() { |
699 | //-------------------------------------------------------------------- | |
700 | // This function calculates the road defined by the cluster density | |
701 | //-------------------------------------------------------------------- | |
702 | Int_t n=0; | |
c219fd63 | 703 | for (Int_t s=0; s<kNsector; s++) { |
704 | Int_t i=fN[s]; | |
705 | while (i--) | |
706 | if (TMath::Abs(fClusters[s*kMaxClusterPerSector+i]->GetZ())<fR) n++; | |
b87bd7cd | 707 | } |
708 | if (n>1) fRoad=2*fR*TMath::Sqrt(3.14/n); | |
709 | } | |
710 | ||
00a7cc50 | 711 | Int_t AliITStrackerV2::AliITSlayer::InsertCluster(AliITSRecPoint *c) { |
006b5f7f | 712 | //-------------------------------------------------------------------- |
c219fd63 | 713 | // This function inserts a cluster to this layer in increasing |
714 | // order of the cluster's fZ | |
006b5f7f | 715 | //-------------------------------------------------------------------- |
c219fd63 | 716 | Float_t circ=TMath::TwoPi()*fR; |
717 | Int_t sec=Int_t(kNsector*c->GetPhiR()/circ); | |
81e97e0d | 718 | if (sec>=kNsector) { |
719 | ::Error("InsertCluster","Wrong sector !\n"); | |
720 | return 1; | |
721 | } | |
c219fd63 | 722 | Int_t &n=fN[sec]; |
723 | if (n>=kMaxClusterPerSector) { | |
724 | ::Error("InsertCluster","Too many clusters !\n"); | |
725 | return 1; | |
006b5f7f | 726 | } |
c219fd63 | 727 | if (n==0) fClusters[sec*kMaxClusterPerSector]=c; |
728 | else { | |
729 | Int_t i=FindClusterIndex(c->GetZ(),sec); | |
730 | Int_t k=n-i+sec*kMaxClusterPerSector; | |
00a7cc50 | 731 | memmove(fClusters+i+1 ,fClusters+i,k*sizeof(AliITSRecPoint*)); |
c219fd63 | 732 | fClusters[i]=c; |
733 | } | |
734 | n++; | |
006b5f7f | 735 | return 0; |
736 | } | |
737 | ||
c219fd63 | 738 | Int_t |
739 | AliITStrackerV2::AliITSlayer::FindClusterIndex(Float_t z,Int_t s) const { | |
006b5f7f | 740 | //-------------------------------------------------------------------- |
c219fd63 | 741 | // For the sector "s", this function returns the index of the first |
742 | // with its fZ >= "z". | |
006b5f7f | 743 | //-------------------------------------------------------------------- |
c219fd63 | 744 | Int_t nc=fN[s]; |
745 | if (nc==0) return kMaxClusterPerSector*s; | |
746 | ||
747 | Int_t b=kMaxClusterPerSector*s; | |
748 | if (z <= fClusters[b]->GetZ()) return b; | |
749 | ||
750 | Int_t e=b+nc-1; | |
751 | if (z > fClusters[e]->GetZ()) return e+1; | |
752 | ||
753 | Int_t m=(b+e)/2; | |
006b5f7f | 754 | for (; b<e; m=(b+e)/2) { |
755 | if (z > fClusters[m]->GetZ()) b=m+1; | |
756 | else e=m; | |
757 | } | |
758 | return m; | |
759 | } | |
760 | ||
c219fd63 | 761 | Int_t AliITStrackerV2::AliITSlayer:: |
762 | SelectClusters(Float_t zmin,Float_t zmax,Float_t ymin, Float_t ymax) { | |
006b5f7f | 763 | //-------------------------------------------------------------------- |
c219fd63 | 764 | // This function selects clusters within the "window" |
006b5f7f | 765 | //-------------------------------------------------------------------- |
c219fd63 | 766 | Float_t circ=fR*TMath::TwoPi(); |
767 | ||
768 | if (ymin>circ) ymin-=circ; else if (ymin<0) ymin+=circ; | |
769 | if (ymax>circ) ymax-=circ; else if (ymax<0) ymax+=circ; | |
770 | ||
521f4796 | 771 | Int_t i1=Int_t(kNsector*ymin/circ); if (i1==kNsector) i1--; |
c219fd63 | 772 | if (fN[i1]!=0) { |
773 | Float_t ym = (ymax<ymin) ? ymax+circ : ymax; | |
774 | Int_t i=FindClusterIndex(zmin,i1), imax=i1*kMaxClusterPerSector+fN[i1]; | |
775 | for (; i<imax; i++) { | |
00a7cc50 | 776 | AliITSRecPoint *c=fClusters[i]; |
c219fd63 | 777 | if (c->IsUsed()) continue; |
778 | if (c->GetZ()>zmax) break; | |
779 | if (c->GetPhiR()<=ymin) continue; | |
780 | if (c->GetPhiR()>ym) continue; | |
781 | fIndex[fNsel++]=i; | |
782 | } | |
783 | } | |
784 | ||
521f4796 | 785 | Int_t i2=Int_t(kNsector*ymax/circ); if (i2==kNsector) i2--; |
c219fd63 | 786 | if (i2==i1) return fNsel; |
787 | ||
788 | if (fN[i2]!=0) { | |
789 | Float_t ym = (ymin>ymax) ? ymin-circ : ymin; | |
790 | Int_t i=FindClusterIndex(zmin,i2), imax=i2*kMaxClusterPerSector+fN[i2]; | |
791 | for (; i<imax; i++) { | |
00a7cc50 | 792 | AliITSRecPoint *c=fClusters[i]; |
c219fd63 | 793 | if (c->IsUsed()) continue; |
794 | if (c->GetZ()>zmax) break; | |
795 | if (c->GetPhiR()<=ym) continue; | |
796 | if (c->GetPhiR()>ymax) continue; | |
797 | fIndex[fNsel++]=i; | |
798 | } | |
799 | } | |
800 | ||
801 | return fNsel; | |
006b5f7f | 802 | } |
803 | ||
00a7cc50 | 804 | const AliITSRecPoint *AliITStrackerV2::AliITSlayer::GetNextCluster(Int_t &ci){ |
006b5f7f | 805 | //-------------------------------------------------------------------- |
806 | // This function returns clusters within the "window" | |
807 | //-------------------------------------------------------------------- | |
00a7cc50 | 808 | AliITSRecPoint *c=0; |
c219fd63 | 809 | ci=-1; |
810 | if (fNsel) { | |
811 | fNsel--; | |
812 | ci=fIndex[fNsel]; | |
813 | c=fClusters[ci]; | |
006b5f7f | 814 | } |
c219fd63 | 815 | return c; |
816 | } | |
7f6ddf58 | 817 | |
c219fd63 | 818 | Int_t AliITStrackerV2::AliITSlayer::GetNumberOfClusters() const { |
819 | Int_t n=0; | |
820 | for (Int_t s=0; s<kNsector; s++) n+=fN[s]; | |
821 | return n; | |
006b5f7f | 822 | } |
823 | ||
c219fd63 | 824 | Int_t |
825 | AliITStrackerV2::AliITSlayer::FindDetectorIndex(Double_t phi,Double_t z)const { | |
006b5f7f | 826 | //-------------------------------------------------------------------- |
827 | //This function finds the detector crossed by the track | |
828 | //-------------------------------------------------------------------- | |
31fb8575 | 829 | Double_t dphi; |
830 | if (fZOffset<0) // old geometry | |
831 | dphi = -(phi-fPhiOffset); | |
832 | else // new geometry | |
833 | dphi = phi-fPhiOffset; | |
834 | ||
006b5f7f | 835 | if (dphi < 0) dphi += 2*TMath::Pi(); |
836 | else if (dphi >= 2*TMath::Pi()) dphi -= 2*TMath::Pi(); | |
837 | Int_t np=Int_t(dphi*fNladders*0.5/TMath::Pi()+0.5); | |
3e3e8427 | 838 | if (np>=fNladders) np-=fNladders; |
839 | if (np<0) np+=fNladders; | |
006b5f7f | 840 | |
841 | Double_t dz=fZOffset-z; | |
842 | Int_t nz=Int_t(dz*(fNdetectors-1)*0.5/fZOffset+0.5); | |
3e3e8427 | 843 | if (nz>=fNdetectors) return -1; |
844 | if (nz<0) return -1; | |
006b5f7f | 845 | |
006b5f7f | 846 | return np*fNdetectors + nz; |
847 | } | |
848 | ||
849 | Double_t | |
61ab8ea8 | 850 | AliITStrackerV2::AliITSlayer::GetThickness(Double_t y,Double_t z,Double_t &x0) |
851 | const { | |
a9a2d814 | 852 | //-------------------------------------------------------------------- |
853 | //This function returns the layer thickness at this point (units X0) | |
854 | //-------------------------------------------------------------------- | |
855 | Double_t d=0.0085; | |
61ab8ea8 | 856 | x0=21.82; |
a9a2d814 | 857 | |
858 | if (43<fR&&fR<45) { //SSD2 | |
61ab8ea8 | 859 | Double_t dd=0.0034; |
860 | d=dd; | |
861 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
862 | if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);} | |
863 | if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);} | |
a9a2d814 | 864 | for (Int_t i=0; i<12; i++) { |
61ab8ea8 | 865 | if (TMath::Abs(z-3.9*(i+0.5))<0.15) { |
866 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
867 | d+=0.0034; | |
868 | break; | |
869 | } | |
870 | if (TMath::Abs(z+3.9*(i+0.5))<0.15) { | |
871 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
872 | d+=0.0034; | |
873 | break; | |
874 | } | |
875 | if (TMath::Abs(z-3.4-3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
876 | if (TMath::Abs(z+0.5+3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
a9a2d814 | 877 | } |
878 | } else | |
879 | if (37<fR&&fR<41) { //SSD1 | |
61ab8ea8 | 880 | Double_t dd=0.0034; |
881 | d=dd; | |
882 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
883 | if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);} | |
884 | if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);} | |
a9a2d814 | 885 | for (Int_t i=0; i<11; i++) { |
61ab8ea8 | 886 | if (TMath::Abs(z-3.9*i)<0.15) { |
887 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
888 | d+=dd; | |
889 | break; | |
890 | } | |
891 | if (TMath::Abs(z+3.9*i)<0.15) { | |
892 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
893 | d+=dd; | |
894 | break; | |
895 | } | |
896 | if (TMath::Abs(z-1.85-3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
897 | if (TMath::Abs(z+2.05+3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
a9a2d814 | 898 | } |
899 | } else | |
900 | if (13<fR&&fR<26) { //SDD | |
61ab8ea8 | 901 | Double_t dd=0.0033; |
902 | d=dd; | |
903 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
904 | ||
905 | if (TMath::Abs(y-1.80)<0.55) { | |
906 | d+=0.016; | |
907 | for (Int_t j=0; j<20; j++) { | |
908 | if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
909 | if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
910 | } | |
911 | } | |
912 | if (TMath::Abs(y+1.80)<0.55) { | |
913 | d+=0.016; | |
914 | for (Int_t j=0; j<20; j++) { | |
915 | if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
916 | if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
917 | } | |
918 | } | |
919 | ||
920 | for (Int_t i=0; i<4; i++) { | |
921 | if (TMath::Abs(z-7.3*i)<0.60) { | |
922 | d+=dd; | |
923 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
924 | break; | |
925 | } | |
926 | if (TMath::Abs(z+7.3*i)<0.60) { | |
927 | d+=dd; | |
928 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
929 | break; | |
930 | } | |
a9a2d814 | 931 | } |
932 | } else | |
933 | if (6<fR&&fR<8) { //SPD2 | |
61ab8ea8 | 934 | Double_t dd=0.0063; x0=21.5; |
935 | d=dd; | |
936 | if (TMath::Abs(y-3.08)>0.5) d+=dd; | |
937 | //if (TMath::Abs(y-3.08)>0.45) d+=dd; | |
938 | if (TMath::Abs(y-3.03)<0.10) {d+=0.014;} | |
a9a2d814 | 939 | } else |
940 | if (3<fR&&fR<5) { //SPD1 | |
61ab8ea8 | 941 | Double_t dd=0.0063; x0=21.5; |
942 | d=dd; | |
943 | if (TMath::Abs(y+0.21)>0.6) d+=dd; | |
944 | //if (TMath::Abs(y+0.21)>0.45) d+=dd; | |
945 | if (TMath::Abs(y+0.10)<0.10) {d+=0.014;} | |
a9a2d814 | 946 | } |
947 | ||
a9a2d814 | 948 | return d; |
949 | } | |
006b5f7f | 950 | |
a9a2d814 | 951 | Double_t AliITStrackerV2::GetEffectiveThickness(Double_t y,Double_t z) const |
006b5f7f | 952 | { |
953 | //-------------------------------------------------------------------- | |
a9a2d814 | 954 | //Returns the thickness between the current layer and the vertex (units X0) |
006b5f7f | 955 | //-------------------------------------------------------------------- |
61ab8ea8 | 956 | Double_t d=0.0028*3*3; //beam pipe |
957 | Double_t x0=0; | |
006b5f7f | 958 | |
18856a77 | 959 | Double_t xn=fgLayers[fI].GetR(); |
006b5f7f | 960 | for (Int_t i=0; i<fI; i++) { |
18856a77 | 961 | Double_t xi=fgLayers[i].GetR(); |
962 | d+=fgLayers[i].GetThickness(y,z,x0)*xi*xi; | |
006b5f7f | 963 | } |
964 | ||
965 | if (fI>1) { | |
61ab8ea8 | 966 | Double_t xi=9.; |
967 | d+=0.0097*xi*xi; | |
006b5f7f | 968 | } |
969 | ||
970 | if (fI>3) { | |
18856a77 | 971 | Double_t xi=0.5*(fgLayers[3].GetR()+fgLayers[4].GetR()); |
61ab8ea8 | 972 | d+=0.0034*xi*xi; |
006b5f7f | 973 | } |
61ab8ea8 | 974 | |
006b5f7f | 975 | return d/(xn*xn); |
976 | } | |
977 | ||
ef7253ac | 978 | Bool_t AliITStrackerV2::RefitAt(Double_t xx,AliITStrackV2 *t, |
979 | const AliITStrackV2 *c, Bool_t extra) { | |
4ab260d6 | 980 | //-------------------------------------------------------------------- |
c630aafd | 981 | // This function refits the track "t" at the position "x" using |
982 | // the clusters from "c" | |
ef7253ac | 983 | // If "extra"==kTRUE, |
984 | // the clusters from overlapped modules get attached to "t" | |
4ab260d6 | 985 | //-------------------------------------------------------------------- |
880f41b9 | 986 | Int_t index[kMaxLayer]; |
987 | Int_t k; | |
988 | for (k=0; k<kMaxLayer; k++) index[k]=-1; | |
c630aafd | 989 | Int_t nc=c->GetNumberOfClusters(); |
880f41b9 | 990 | for (k=0; k<nc; k++) { |
c630aafd | 991 | Int_t idx=c->GetClusterIndex(k),nl=(idx&0xf0000000)>>28; |
880f41b9 | 992 | index[nl]=idx; |
993 | } | |
880f41b9 | 994 | |
4ab260d6 | 995 | Int_t from, to, step; |
ee34184f | 996 | if (xx > t->GetX()) { |
4ab260d6 | 997 | from=0; to=kMaxLayer; |
998 | step=+1; | |
999 | } else { | |
1000 | from=kMaxLayer-1; to=-1; | |
1001 | step=-1; | |
1002 | } | |
1003 | ||
1004 | for (Int_t i=from; i != to; i += step) { | |
18856a77 | 1005 | AliITSlayer &layer=fgLayers[i]; |
4ab260d6 | 1006 | Double_t r=layer.GetR(); |
1007 | ||
1008 | { | |
1009 | Double_t hI=i-0.5*step; | |
880f41b9 | 1010 | if (TMath::Abs(hI-1.5)<0.01 || TMath::Abs(hI-3.5)<0.01) { |
18856a77 | 1011 | Double_t rs=0.5*(fgLayers[i-step].GetR() + r); |
61ab8ea8 | 1012 | Double_t d=0.0034, x0=38.6; |
880f41b9 | 1013 | if (TMath::Abs(hI-1.5)<0.01) {rs=9.; d=0.0097; x0=42;} |
1014 | if (!t->PropagateTo(rs,-step*d,x0)) { | |
4ab260d6 | 1015 | return kFALSE; |
1016 | } | |
1017 | } | |
1018 | } | |
1019 | ||
880f41b9 | 1020 | // remember old position [SR, GSI 18.02.2003] |
1021 | Double_t oldX=0., oldY=0., oldZ=0.; | |
1022 | if (t->IsStartedTimeIntegral() && step==1) { | |
1023 | t->GetGlobalXYZat(t->GetX(),oldX,oldY,oldZ); | |
1024 | } | |
1025 | // | |
1026 | ||
8602c008 | 1027 | Double_t phi,z; |
1028 | if (!t->GetPhiZat(r,phi,z)) { | |
4ab260d6 | 1029 | return kFALSE; |
1030 | } | |
8602c008 | 1031 | |
4ab260d6 | 1032 | Int_t idet=layer.FindDetectorIndex(phi,z); |
1033 | if (idet<0) { | |
1034 | return kFALSE; | |
1035 | } | |
1036 | const AliITSdetector &det=layer.GetDetector(idet); | |
1037 | phi=det.GetPhi(); | |
1038 | if (!t->Propagate(phi,det.GetR())) { | |
1039 | return kFALSE; | |
1040 | } | |
1041 | t->SetDetectorIndex(idet); | |
1042 | ||
00a7cc50 | 1043 | const AliITSRecPoint *cl=0; |
4ab260d6 | 1044 | Double_t maxchi2=kMaxChi2; |
1045 | ||
1046 | Int_t idx=index[i]; | |
1047 | if (idx>0) { | |
00a7cc50 | 1048 | const AliITSRecPoint *c=(AliITSRecPoint *)GetCluster(idx); |
4ab260d6 | 1049 | if (idet != c->GetDetectorIndex()) { |
1050 | idet=c->GetDetectorIndex(); | |
1051 | const AliITSdetector &det=layer.GetDetector(idet); | |
1052 | if (!t->Propagate(det.GetPhi(),det.GetR())) { | |
1053 | return kFALSE; | |
1054 | } | |
1055 | t->SetDetectorIndex(idet); | |
1056 | } | |
1057 | Double_t chi2=t->GetPredictedChi2(c); | |
c630aafd | 1058 | if (chi2<maxchi2) { |
1059 | cl=c; | |
1060 | maxchi2=chi2; | |
1061 | } else { | |
1062 | return kFALSE; | |
1063 | } | |
4ab260d6 | 1064 | } |
ef7253ac | 1065 | |
4ab260d6 | 1066 | if (cl) { |
1f3e997f | 1067 | // Take into account the mis-alignment |
1068 | Double_t x=t->GetX()+cl->GetX(); | |
1069 | if (!t->PropagateTo(x,0.,0.)) return kFALSE; | |
4ab260d6 | 1070 | if (!t->Update(cl,maxchi2,idx)) { |
1071 | return kFALSE; | |
1072 | } | |
880f41b9 | 1073 | t->SetSampledEdx(cl->GetQ(),t->GetNumberOfClusters()-1); |
4ab260d6 | 1074 | } |
1075 | ||
1076 | { | |
61ab8ea8 | 1077 | Double_t x0; |
1078 | Double_t d=layer.GetThickness(t->GetY(),t->GetZ(),x0); | |
1079 | t->CorrectForMaterial(-step*d,x0); | |
4ab260d6 | 1080 | } |
880f41b9 | 1081 | |
ef7253ac | 1082 | if (extra) { //search for extra clusters |
1083 | AliITStrackV2 tmp(*t); | |
1084 | Double_t dz=4*TMath::Sqrt(tmp.GetSigmaZ2()+kSigmaZ2[i]); | |
1085 | if (dz < 0.5*TMath::Abs(tmp.GetTgl())) dz=0.5*TMath::Abs(tmp.GetTgl()); | |
1086 | Double_t dy=4*TMath::Sqrt(t->GetSigmaY2()+kSigmaY2[i]); | |
1087 | if (dy < 0.5*TMath::Abs(tmp.GetSnp())) dy=0.5*TMath::Abs(tmp.GetSnp()); | |
1088 | Double_t zmin=t->GetZ() - dz; | |
1089 | Double_t zmax=t->GetZ() + dz; | |
1090 | Double_t ymin=t->GetY() + phi*r - dy; | |
1091 | Double_t ymax=t->GetY() + phi*r + dy; | |
1092 | layer.SelectClusters(zmin,zmax,ymin,ymax); | |
1093 | ||
1094 | const AliITSRecPoint *c=0; Int_t ci=-1,cci=-1; | |
1095 | Double_t maxchi2=1000.*kMaxChi2, tolerance=0.1; | |
1096 | while ((c=layer.GetNextCluster(ci))!=0) { | |
1097 | if (idet == c->GetDetectorIndex()) continue; | |
1098 | ||
1099 | const AliITSdetector &det=layer.GetDetector(c->GetDetectorIndex()); | |
1100 | ||
1101 | if (!tmp.Propagate(det.GetPhi(),det.GetR())) continue; | |
1102 | ||
1103 | if (TMath::Abs(tmp.GetZ() - c->GetZ()) > tolerance) continue; | |
1104 | if (TMath::Abs(tmp.GetY() - c->GetY()) > tolerance) continue; | |
1105 | ||
1106 | Double_t chi2=tmp.GetPredictedChi2(c); | |
1107 | if (chi2<maxchi2) { maxchi2=chi2; cci=ci; } | |
1108 | } | |
1109 | if (cci>=0) t->SetExtraCluster(i,(i<<28)+cci); | |
1110 | } | |
1111 | ||
880f41b9 | 1112 | // track time update [SR, GSI 17.02.2003] |
1113 | if (t->IsStartedTimeIntegral() && step==1) { | |
1114 | Double_t newX, newY, newZ; | |
1115 | t->GetGlobalXYZat(t->GetX(),newX,newY,newZ); | |
1116 | Double_t dL2 = (oldX-newX)*(oldX-newX) + (oldY-newY)*(oldY-newY) + | |
1117 | (oldZ-newZ)*(oldZ-newZ); | |
1118 | t->AddTimeStep(TMath::Sqrt(dL2)); | |
1119 | } | |
1120 | // | |
4ab260d6 | 1121 | |
1122 | } | |
1123 | ||
ee34184f | 1124 | if (!t->PropagateTo(xx,0.,0.)) return kFALSE; |
4ab260d6 | 1125 | return kTRUE; |
1126 | } | |
1127 | ||
b87bd7cd | 1128 | void AliITStrackerV2::UseClusters(const AliKalmanTrack *t, Int_t from) const { |
1129 | //-------------------------------------------------------------------- | |
1130 | // This function marks clusters assigned to the track | |
1131 | //-------------------------------------------------------------------- | |
1132 | AliTracker::UseClusters(t,from); | |
880f41b9 | 1133 | |
5482d29d | 1134 | Int_t clusterIndex = t->GetClusterIndex(0); |
1135 | AliITSRecPoint *c= 0x0; | |
1136 | ||
1137 | if (clusterIndex>-1) | |
1138 | c = (AliITSRecPoint *)GetCluster(clusterIndex); | |
d920bdee | 1139 | if (c && c->GetSigmaZ2()>0.1) c->UnUse(); |
5482d29d | 1140 | |
1141 | c = 0x0; | |
1142 | clusterIndex = t->GetClusterIndex(1); | |
1143 | if (clusterIndex>-1) | |
1144 | c=(AliITSRecPoint *)GetCluster(clusterIndex); | |
d920bdee | 1145 | if (c && c->GetSigmaZ2()>0.1) c->UnUse(); |
880f41b9 | 1146 | |
b87bd7cd | 1147 | } |