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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 | ||
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 | //-------------------------------------------------------------------- | |
61ab8ea8 | 112 | TBranch *branch=cTree->GetBranch("Clusters"); |
113 | if (!branch) { | |
c630aafd | 114 | Error("LoadClusters"," can't get the branch !\n"); |
8676d691 | 115 | return 1; |
61ab8ea8 | 116 | } |
006b5f7f | 117 | |
61ab8ea8 | 118 | TClonesArray dummy("AliITSclusterV2",10000), *clusters=&dummy; |
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--) { | |
133 | AliITSclusterV2 *c=(AliITSclusterV2*)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 | ||
18856a77 | 140 | fgLayers[i].InsertCluster(new AliITSclusterV2(*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 | |
67c3dcbe | 375 | if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) {//The beam pipe |
376 | Double_t a=fTrackToFollow.GetAlpha(); | |
377 | Double_t cs=TMath::Cos(a),sn=TMath::Sin(a); | |
378 | Double_t xv= GetX()*cs + GetY()*sn; | |
379 | Double_t yv=-GetX()*sn + GetY()*cs; | |
380 | ||
381 | Double_t c=fTrackToFollow.GetC(), snp=fTrackToFollow.GetSnp(); | |
382 | Double_t x=fTrackToFollow.GetX(), y=fTrackToFollow.GetY(); | |
383 | Double_t tgfv=-(c*(x-xv)-snp)/(c*(y-yv) + TMath::Sqrt(1.-snp*snp)); | |
384 | Double_t fv=TMath::ATan(tgfv); | |
385 | ||
386 | cs=TMath::Cos(fv); sn=TMath::Sin(fv); | |
387 | x = xv*cs + yv*sn; | |
388 | yv=-xv*sn + yv*cs; xv=x; | |
389 | ||
390 | if (fTrackToFollow.Propagate(fv+a,xv)) { | |
df02fd67 | 391 | fTrackToFollow.UpdateESDtrack(AliESDtrack::kITSrefit); |
399fb957 | 392 | Float_t d=fTrackToFollow.GetD(GetX(),GetY()); |
393 | Float_t z=fTrackToFollow.GetZ()-GetZ(); | |
394 | fTrackToFollow.GetESDtrack()->SetImpactParameters(d,z); | |
15dd636f | 395 | UseClusters(&fTrackToFollow); |
67c3dcbe | 396 | { |
397 | AliITSclusterV2 c; c.SetY(yv); c.SetZ(GetZ()); | |
398 | c.SetSigmaY2(GetSigmaY()*GetSigmaY()); | |
399 | c.SetSigmaZ2(GetSigmaZ()*GetSigmaZ()); | |
400 | Double_t chi2=fTrackToFollow.GetPredictedChi2(&c); | |
401 | if (chi2<kMaxChi2) | |
402 | if (fTrackToFollow.Update(&c,-chi2,0)) | |
403 | fTrackToFollow.SetConstrainedESDtrack(chi2); | |
404 | } | |
df02fd67 | 405 | ntrk++; |
406 | } | |
67c3dcbe | 407 | } |
c630aafd | 408 | } |
409 | delete t; | |
410 | } | |
411 | ||
412 | Info("RefitInward","Number of refitted tracks: %d\n",ntrk); | |
83d73500 | 413 | |
c630aafd | 414 | return 0; |
415 | } | |
83d73500 | 416 | |
006b5f7f | 417 | AliCluster *AliITStrackerV2::GetCluster(Int_t index) const { |
418 | //-------------------------------------------------------------------- | |
419 | // Return pointer to a given cluster | |
420 | //-------------------------------------------------------------------- | |
421 | Int_t l=(index & 0xf0000000) >> 28; | |
422 | Int_t c=(index & 0x0fffffff) >> 00; | |
18856a77 | 423 | return fgLayers[l].GetCluster(c); |
006b5f7f | 424 | } |
425 | ||
426 | ||
427 | void AliITStrackerV2::FollowProlongation() { | |
428 | //-------------------------------------------------------------------- | |
429 | //This function finds a track prolongation | |
430 | //-------------------------------------------------------------------- | |
c0dd5278 | 431 | while (fI>fLastLayerToTrackTo) { |
a9a2d814 | 432 | Int_t i=fI-1; |
8676d691 | 433 | |
18856a77 | 434 | AliITSlayer &layer=fgLayers[i]; |
a9a2d814 | 435 | AliITStrackV2 &track=fTracks[i]; |
006b5f7f | 436 | |
14825d5a | 437 | Double_t r=layer.GetR(); |
61ab8ea8 | 438 | |
a9a2d814 | 439 | if (i==3 || i==1) { |
18856a77 | 440 | Double_t rs=0.5*(fgLayers[i+1].GetR() + r); |
61ab8ea8 | 441 | Double_t d=0.0034, x0=38.6; |
442 | if (i==1) {rs=9.; d=0.0097; x0=42;} | |
443 | if (!fTrackToFollow.PropagateTo(rs,d,x0)) { | |
8676d691 | 444 | //Warning("FollowProlongation","propagation failed !\n"); |
c0dd5278 | 445 | return; |
a9a2d814 | 446 | } |
006b5f7f | 447 | } |
448 | ||
449 | //find intersection | |
450 | Double_t x,y,z; | |
14825d5a | 451 | if (!fTrackToFollow.GetGlobalXYZat(r,x,y,z)) { |
8676d691 | 452 | //Warning("FollowProlongation","failed to estimate track !\n"); |
c0dd5278 | 453 | return; |
006b5f7f | 454 | } |
455 | Double_t phi=TMath::ATan2(y,x); | |
f363d377 | 456 | |
006b5f7f | 457 | Int_t idet=layer.FindDetectorIndex(phi,z); |
458 | if (idet<0) { | |
8676d691 | 459 | //Warning("FollowProlongation","failed to find a detector !\n"); |
c0dd5278 | 460 | return; |
006b5f7f | 461 | } |
462 | ||
463 | //propagate to the intersection | |
464 | const AliITSdetector &det=layer.GetDetector(idet); | |
14825d5a | 465 | phi=det.GetPhi(); |
a9a2d814 | 466 | if (!fTrackToFollow.Propagate(phi,det.GetR())) { |
8676d691 | 467 | //Warning("FollowProlongation","propagation failed !\n"); |
c0dd5278 | 468 | return; |
006b5f7f | 469 | } |
470 | fTrackToFollow.SetDetectorIndex(idet); | |
471 | ||
472 | //Select possible prolongations and store the current track estimation | |
473 | track.~AliITStrackV2(); new(&track) AliITStrackV2(fTrackToFollow); | |
8676d691 | 474 | Double_t dz=7*TMath::Sqrt(track.GetSigmaZ2() + kSigmaZ2[i]); |
475 | Double_t dy=7*TMath::Sqrt(track.GetSigmaY2() + kSigmaY2[i]); | |
476 | Double_t road=layer.GetRoad(); | |
477 | if (dz*dy>road*road) { | |
478 | Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd; | |
479 | dz=road*scz; dy=road*scy; | |
480 | } | |
b87bd7cd | 481 | |
482 | //Double_t dz=4*TMath::Sqrt(track.GetSigmaZ2() + kSigmaZ2[i]); | |
14825d5a | 483 | if (dz < 0.5*TMath::Abs(track.GetTgl())) dz=0.5*TMath::Abs(track.GetTgl()); |
7f6ddf58 | 484 | if (dz > kMaxRoad) { |
8676d691 | 485 | //Warning("FollowProlongation","too broad road in Z !\n"); |
c0dd5278 | 486 | return; |
006b5f7f | 487 | } |
a9a2d814 | 488 | |
15dd636f | 489 | if (TMath::Abs(fTrackToFollow.GetZ()-GetZ()) > r+dz) return; |
a9a2d814 | 490 | |
b87bd7cd | 491 | //Double_t dy=4*TMath::Sqrt(track.GetSigmaY2() + kSigmaY2[i]); |
14825d5a | 492 | if (dy < 0.5*TMath::Abs(track.GetSnp())) dy=0.5*TMath::Abs(track.GetSnp()); |
7f6ddf58 | 493 | if (dy > kMaxRoad) { |
8676d691 | 494 | //Warning("FollowProlongation","too broad road in Y !\n"); |
c0dd5278 | 495 | return; |
006b5f7f | 496 | } |
a9a2d814 | 497 | |
c219fd63 | 498 | fI--; |
499 | ||
7f6ddf58 | 500 | Double_t zmin=track.GetZ() - dz; |
006b5f7f | 501 | Double_t zmax=track.GetZ() + dz; |
14825d5a | 502 | Double_t ymin=track.GetY() + r*phi - dy; |
503 | Double_t ymax=track.GetY() + r*phi + dy; | |
c219fd63 | 504 | if (layer.SelectClusters(zmin,zmax,ymin,ymax)==0) |
505 | if (fLayersNotToSkip[fI]) return; | |
006b5f7f | 506 | |
15dd636f | 507 | if (!TakeNextProlongation()) |
508 | if (fLayersNotToSkip[fI]) return; | |
509 | ||
006b5f7f | 510 | } |
511 | ||
512 | //deal with the best track | |
513 | Int_t ncl=fTrackToFollow.GetNumberOfClusters(); | |
514 | Int_t nclb=fBestTrack.GetNumberOfClusters(); | |
15dd636f | 515 | if (ncl) |
516 | if (ncl >= nclb) { | |
517 | Double_t chi2=fTrackToFollow.GetChi2(); | |
518 | if (chi2/ncl < kChi2PerCluster) { | |
519 | if (ncl > nclb || chi2 < fBestTrack.GetChi2()) { | |
520 | ResetBestTrack(); | |
006b5f7f | 521 | } |
15dd636f | 522 | } |
006b5f7f | 523 | } |
15dd636f | 524 | |
006b5f7f | 525 | } |
526 | ||
006b5f7f | 527 | Int_t AliITStrackerV2::TakeNextProlongation() { |
528 | //-------------------------------------------------------------------- | |
a9a2d814 | 529 | // This function takes another track prolongation |
530 | // | |
531 | // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch | |
006b5f7f | 532 | //-------------------------------------------------------------------- |
18856a77 | 533 | AliITSlayer &layer=fgLayers[fI]; |
4ab260d6 | 534 | ResetTrackToFollow(fTracks[fI]); |
006b5f7f | 535 | |
b87bd7cd | 536 | Double_t dz=7*TMath::Sqrt(fTrackToFollow.GetSigmaZ2() + kSigmaZ2[fI]); |
537 | Double_t dy=7*TMath::Sqrt(fTrackToFollow.GetSigmaY2() + kSigmaY2[fI]); | |
8676d691 | 538 | Double_t road=layer.GetRoad(); |
539 | if (dz*dy>road*road) { | |
540 | Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd; | |
541 | dz=road*scz; dy=road*scy; | |
542 | } | |
006b5f7f | 543 | |
544 | const AliITSclusterV2 *c=0; Int_t ci=-1; | |
c219fd63 | 545 | const AliITSclusterV2 *cc=0; Int_t cci=-1; |
546 | Double_t chi2=kMaxChi2; | |
006b5f7f | 547 | while ((c=layer.GetNextCluster(ci))!=0) { |
006b5f7f | 548 | Int_t idet=c->GetDetectorIndex(); |
15dd636f | 549 | |
4ab260d6 | 550 | if (fTrackToFollow.GetDetectorIndex()!=idet) { |
006b5f7f | 551 | const AliITSdetector &det=layer.GetDetector(idet); |
4ab260d6 | 552 | ResetTrackToFollow(fTracks[fI]); |
553 | if (!fTrackToFollow.Propagate(det.GetPhi(),det.GetR())) { | |
8676d691 | 554 | //Warning("TakeNextProlongation","propagation failed !\n"); |
006b5f7f | 555 | continue; |
556 | } | |
4ab260d6 | 557 | fTrackToFollow.SetDetectorIndex(idet); |
558 | if (TMath::Abs(fTrackToFollow.GetZ()-GetZ())>layer.GetR()+dz) continue; | |
006b5f7f | 559 | } |
560 | ||
4ab260d6 | 561 | if (TMath::Abs(fTrackToFollow.GetZ() - c->GetZ()) > dz) continue; |
562 | if (TMath::Abs(fTrackToFollow.GetY() - c->GetY()) > dy) continue; | |
006b5f7f | 563 | |
c219fd63 | 564 | Double_t ch2=fTrackToFollow.GetPredictedChi2(c); |
565 | if (ch2 > chi2) continue; | |
566 | chi2=ch2; | |
567 | cc=c; cci=ci; | |
568 | break; | |
006b5f7f | 569 | } |
570 | ||
c219fd63 | 571 | if (!cc) return 0; |
006b5f7f | 572 | |
c219fd63 | 573 | if (!fTrackToFollow.Update(cc,chi2,(fI<<28)+cci)) { |
8676d691 | 574 | //Warning("TakeNextProlongation","filtering failed !\n"); |
006b5f7f | 575 | return 0; |
576 | } | |
15dd636f | 577 | |
4ab260d6 | 578 | if (fTrackToFollow.GetNumberOfClusters()>1) |
579 | if (TMath::Abs(fTrackToFollow.GetD())>4) return 0; | |
580 | ||
a9a2d814 | 581 | fTrackToFollow. |
c219fd63 | 582 | SetSampledEdx(cc->GetQ(),fTrackToFollow.GetNumberOfClusters()-1); //b.b. |
a9a2d814 | 583 | |
584 | { | |
880f41b9 | 585 | Double_t x0; |
61ab8ea8 | 586 | Double_t d=layer.GetThickness(fTrackToFollow.GetY(),fTrackToFollow.GetZ(),x0); |
880f41b9 | 587 | fTrackToFollow.CorrectForMaterial(d,x0); |
a9a2d814 | 588 | } |
4ab260d6 | 589 | |
a9a2d814 | 590 | if (fConstraint[fPass]) { |
4ab260d6 | 591 | Double_t d=GetEffectiveThickness(0,0); //Think of this !!!! |
8676d691 | 592 | Double_t xyz[]={GetX(),GetY(),GetZ()}; |
593 | Double_t ers[]={GetSigmaX(),GetSigmaY(),GetSigmaZ()}; | |
594 | fTrackToFollow.Improve(d,xyz,ers); | |
a9a2d814 | 595 | } |
006b5f7f | 596 | |
006b5f7f | 597 | return 1; |
598 | } | |
599 | ||
600 | ||
006b5f7f | 601 | AliITStrackerV2::AliITSlayer::AliITSlayer() { |
602 | //-------------------------------------------------------------------- | |
603 | //default AliITSlayer constructor | |
604 | //-------------------------------------------------------------------- | |
c219fd63 | 605 | fR=0.; fPhiOffset=0.; fZOffset=0.; |
606 | fNladders=0; fNdetectors=0; | |
006b5f7f | 607 | fDetectors=0; |
c219fd63 | 608 | |
609 | for (Int_t i=0; i<kNsector; i++) fN[i]=0; | |
610 | fNsel=0; | |
611 | ||
612 | fRoad=2*fR*TMath::Sqrt(3.14/1.);//assuming that there's only one cluster | |
006b5f7f | 613 | } |
614 | ||
615 | AliITStrackerV2::AliITSlayer:: | |
616 | AliITSlayer(Double_t r,Double_t p,Double_t z,Int_t nl,Int_t nd) { | |
617 | //-------------------------------------------------------------------- | |
618 | //main AliITSlayer constructor | |
619 | //-------------------------------------------------------------------- | |
620 | fR=r; fPhiOffset=p; fZOffset=z; | |
621 | fNladders=nl; fNdetectors=nd; | |
622 | fDetectors=new AliITSdetector[fNladders*fNdetectors]; | |
623 | ||
c219fd63 | 624 | for (Int_t i=0; i<kNsector; i++) fN[i]=0; |
625 | fNsel=0; | |
626 | ||
627 | for (Int_t i=0; i<kMaxClusterPerLayer; i++) fClusters[i]=0; | |
b87bd7cd | 628 | |
629 | fRoad=2*fR*TMath::Sqrt(3.14/1.);//assuming that there's only one cluster | |
006b5f7f | 630 | } |
631 | ||
632 | AliITStrackerV2::AliITSlayer::~AliITSlayer() { | |
633 | //-------------------------------------------------------------------- | |
634 | // AliITSlayer destructor | |
635 | //-------------------------------------------------------------------- | |
636 | delete[] fDetectors; | |
c219fd63 | 637 | ResetClusters(); |
006b5f7f | 638 | } |
639 | ||
61ab8ea8 | 640 | void AliITStrackerV2::AliITSlayer::ResetClusters() { |
641 | //-------------------------------------------------------------------- | |
642 | // This function removes loaded clusters | |
643 | //-------------------------------------------------------------------- | |
c219fd63 | 644 | for (Int_t s=0; s<kNsector; s++) { |
645 | Int_t &n=fN[s]; | |
646 | while (n) { | |
647 | n--; | |
648 | delete fClusters[s*kMaxClusterPerSector+n]; | |
649 | } | |
650 | } | |
61ab8ea8 | 651 | } |
652 | ||
b87bd7cd | 653 | void AliITStrackerV2::AliITSlayer::ResetRoad() { |
654 | //-------------------------------------------------------------------- | |
655 | // This function calculates the road defined by the cluster density | |
656 | //-------------------------------------------------------------------- | |
657 | Int_t n=0; | |
c219fd63 | 658 | for (Int_t s=0; s<kNsector; s++) { |
659 | Int_t i=fN[s]; | |
660 | while (i--) | |
661 | if (TMath::Abs(fClusters[s*kMaxClusterPerSector+i]->GetZ())<fR) n++; | |
b87bd7cd | 662 | } |
663 | if (n>1) fRoad=2*fR*TMath::Sqrt(3.14/n); | |
664 | } | |
665 | ||
006b5f7f | 666 | Int_t AliITStrackerV2::AliITSlayer::InsertCluster(AliITSclusterV2 *c) { |
667 | //-------------------------------------------------------------------- | |
c219fd63 | 668 | // This function inserts a cluster to this layer in increasing |
669 | // order of the cluster's fZ | |
006b5f7f | 670 | //-------------------------------------------------------------------- |
c219fd63 | 671 | Float_t circ=TMath::TwoPi()*fR; |
672 | Int_t sec=Int_t(kNsector*c->GetPhiR()/circ); | |
81e97e0d | 673 | if (sec>=kNsector) { |
674 | ::Error("InsertCluster","Wrong sector !\n"); | |
675 | return 1; | |
676 | } | |
c219fd63 | 677 | Int_t &n=fN[sec]; |
678 | if (n>=kMaxClusterPerSector) { | |
679 | ::Error("InsertCluster","Too many clusters !\n"); | |
680 | return 1; | |
006b5f7f | 681 | } |
c219fd63 | 682 | if (n==0) fClusters[sec*kMaxClusterPerSector]=c; |
683 | else { | |
684 | Int_t i=FindClusterIndex(c->GetZ(),sec); | |
685 | Int_t k=n-i+sec*kMaxClusterPerSector; | |
686 | memmove(fClusters+i+1 ,fClusters+i,k*sizeof(AliITSclusterV2*)); | |
687 | fClusters[i]=c; | |
688 | } | |
689 | n++; | |
006b5f7f | 690 | return 0; |
691 | } | |
692 | ||
c219fd63 | 693 | Int_t |
694 | AliITStrackerV2::AliITSlayer::FindClusterIndex(Float_t z,Int_t s) const { | |
006b5f7f | 695 | //-------------------------------------------------------------------- |
c219fd63 | 696 | // For the sector "s", this function returns the index of the first |
697 | // with its fZ >= "z". | |
006b5f7f | 698 | //-------------------------------------------------------------------- |
c219fd63 | 699 | Int_t nc=fN[s]; |
700 | if (nc==0) return kMaxClusterPerSector*s; | |
701 | ||
702 | Int_t b=kMaxClusterPerSector*s; | |
703 | if (z <= fClusters[b]->GetZ()) return b; | |
704 | ||
705 | Int_t e=b+nc-1; | |
706 | if (z > fClusters[e]->GetZ()) return e+1; | |
707 | ||
708 | Int_t m=(b+e)/2; | |
006b5f7f | 709 | for (; b<e; m=(b+e)/2) { |
710 | if (z > fClusters[m]->GetZ()) b=m+1; | |
711 | else e=m; | |
712 | } | |
713 | return m; | |
714 | } | |
715 | ||
c219fd63 | 716 | Int_t AliITStrackerV2::AliITSlayer:: |
717 | SelectClusters(Float_t zmin,Float_t zmax,Float_t ymin, Float_t ymax) { | |
006b5f7f | 718 | //-------------------------------------------------------------------- |
c219fd63 | 719 | // This function selects clusters within the "window" |
006b5f7f | 720 | //-------------------------------------------------------------------- |
c219fd63 | 721 | Float_t circ=fR*TMath::TwoPi(); |
722 | ||
723 | if (ymin>circ) ymin-=circ; else if (ymin<0) ymin+=circ; | |
724 | if (ymax>circ) ymax-=circ; else if (ymax<0) ymax+=circ; | |
725 | ||
521f4796 | 726 | Int_t i1=Int_t(kNsector*ymin/circ); if (i1==kNsector) i1--; |
c219fd63 | 727 | if (fN[i1]!=0) { |
728 | Float_t ym = (ymax<ymin) ? ymax+circ : ymax; | |
729 | Int_t i=FindClusterIndex(zmin,i1), imax=i1*kMaxClusterPerSector+fN[i1]; | |
730 | for (; i<imax; i++) { | |
731 | AliITSclusterV2 *c=fClusters[i]; | |
732 | if (c->IsUsed()) continue; | |
733 | if (c->GetZ()>zmax) break; | |
734 | if (c->GetPhiR()<=ymin) continue; | |
735 | if (c->GetPhiR()>ym) continue; | |
736 | fIndex[fNsel++]=i; | |
737 | } | |
738 | } | |
739 | ||
521f4796 | 740 | Int_t i2=Int_t(kNsector*ymax/circ); if (i2==kNsector) i2--; |
c219fd63 | 741 | if (i2==i1) return fNsel; |
742 | ||
743 | if (fN[i2]!=0) { | |
744 | Float_t ym = (ymin>ymax) ? ymin-circ : ymin; | |
745 | Int_t i=FindClusterIndex(zmin,i2), imax=i2*kMaxClusterPerSector+fN[i2]; | |
746 | for (; i<imax; i++) { | |
747 | AliITSclusterV2 *c=fClusters[i]; | |
748 | if (c->IsUsed()) continue; | |
749 | if (c->GetZ()>zmax) break; | |
750 | if (c->GetPhiR()<=ym) continue; | |
751 | if (c->GetPhiR()>ymax) continue; | |
752 | fIndex[fNsel++]=i; | |
753 | } | |
754 | } | |
755 | ||
756 | return fNsel; | |
006b5f7f | 757 | } |
758 | ||
759 | const AliITSclusterV2 *AliITStrackerV2::AliITSlayer::GetNextCluster(Int_t &ci){ | |
760 | //-------------------------------------------------------------------- | |
761 | // This function returns clusters within the "window" | |
762 | //-------------------------------------------------------------------- | |
c219fd63 | 763 | AliITSclusterV2 *c=0; |
764 | ci=-1; | |
765 | if (fNsel) { | |
766 | fNsel--; | |
767 | ci=fIndex[fNsel]; | |
768 | c=fClusters[ci]; | |
006b5f7f | 769 | } |
c219fd63 | 770 | return c; |
771 | } | |
7f6ddf58 | 772 | |
c219fd63 | 773 | Int_t AliITStrackerV2::AliITSlayer::GetNumberOfClusters() const { |
774 | Int_t n=0; | |
775 | for (Int_t s=0; s<kNsector; s++) n+=fN[s]; | |
776 | return n; | |
006b5f7f | 777 | } |
778 | ||
c219fd63 | 779 | Int_t |
780 | AliITStrackerV2::AliITSlayer::FindDetectorIndex(Double_t phi,Double_t z)const { | |
006b5f7f | 781 | //-------------------------------------------------------------------- |
782 | //This function finds the detector crossed by the track | |
783 | //-------------------------------------------------------------------- | |
f363d377 | 784 | Double_t dphi=-(phi-fPhiOffset); |
006b5f7f | 785 | if (dphi < 0) dphi += 2*TMath::Pi(); |
786 | else if (dphi >= 2*TMath::Pi()) dphi -= 2*TMath::Pi(); | |
787 | Int_t np=Int_t(dphi*fNladders*0.5/TMath::Pi()+0.5); | |
3e3e8427 | 788 | if (np>=fNladders) np-=fNladders; |
789 | if (np<0) np+=fNladders; | |
006b5f7f | 790 | |
791 | Double_t dz=fZOffset-z; | |
792 | Int_t nz=Int_t(dz*(fNdetectors-1)*0.5/fZOffset+0.5); | |
3e3e8427 | 793 | if (nz>=fNdetectors) return -1; |
794 | if (nz<0) return -1; | |
006b5f7f | 795 | |
006b5f7f | 796 | return np*fNdetectors + nz; |
797 | } | |
798 | ||
799 | Double_t | |
61ab8ea8 | 800 | AliITStrackerV2::AliITSlayer::GetThickness(Double_t y,Double_t z,Double_t &x0) |
801 | const { | |
a9a2d814 | 802 | //-------------------------------------------------------------------- |
803 | //This function returns the layer thickness at this point (units X0) | |
804 | //-------------------------------------------------------------------- | |
805 | Double_t d=0.0085; | |
61ab8ea8 | 806 | x0=21.82; |
a9a2d814 | 807 | |
808 | if (43<fR&&fR<45) { //SSD2 | |
61ab8ea8 | 809 | Double_t dd=0.0034; |
810 | d=dd; | |
811 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
812 | if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);} | |
813 | if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);} | |
a9a2d814 | 814 | for (Int_t i=0; i<12; i++) { |
61ab8ea8 | 815 | if (TMath::Abs(z-3.9*(i+0.5))<0.15) { |
816 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
817 | d+=0.0034; | |
818 | break; | |
819 | } | |
820 | if (TMath::Abs(z+3.9*(i+0.5))<0.15) { | |
821 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
822 | d+=0.0034; | |
823 | break; | |
824 | } | |
825 | if (TMath::Abs(z-3.4-3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
826 | if (TMath::Abs(z+0.5+3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
a9a2d814 | 827 | } |
828 | } else | |
829 | if (37<fR&&fR<41) { //SSD1 | |
61ab8ea8 | 830 | Double_t dd=0.0034; |
831 | d=dd; | |
832 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
833 | if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);} | |
834 | if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);} | |
a9a2d814 | 835 | for (Int_t i=0; i<11; i++) { |
61ab8ea8 | 836 | if (TMath::Abs(z-3.9*i)<0.15) { |
837 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
838 | d+=dd; | |
839 | break; | |
840 | } | |
841 | if (TMath::Abs(z+3.9*i)<0.15) { | |
842 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
843 | d+=dd; | |
844 | break; | |
845 | } | |
846 | if (TMath::Abs(z-1.85-3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
847 | if (TMath::Abs(z+2.05+3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
a9a2d814 | 848 | } |
849 | } else | |
850 | if (13<fR&&fR<26) { //SDD | |
61ab8ea8 | 851 | Double_t dd=0.0033; |
852 | d=dd; | |
853 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
854 | ||
855 | if (TMath::Abs(y-1.80)<0.55) { | |
856 | d+=0.016; | |
857 | for (Int_t j=0; j<20; j++) { | |
858 | if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
859 | if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
860 | } | |
861 | } | |
862 | if (TMath::Abs(y+1.80)<0.55) { | |
863 | d+=0.016; | |
864 | for (Int_t j=0; j<20; j++) { | |
865 | if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
866 | if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
867 | } | |
868 | } | |
869 | ||
870 | for (Int_t i=0; i<4; i++) { | |
871 | if (TMath::Abs(z-7.3*i)<0.60) { | |
872 | d+=dd; | |
873 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
874 | break; | |
875 | } | |
876 | if (TMath::Abs(z+7.3*i)<0.60) { | |
877 | d+=dd; | |
878 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
879 | break; | |
880 | } | |
a9a2d814 | 881 | } |
882 | } else | |
883 | if (6<fR&&fR<8) { //SPD2 | |
61ab8ea8 | 884 | Double_t dd=0.0063; x0=21.5; |
885 | d=dd; | |
886 | if (TMath::Abs(y-3.08)>0.5) d+=dd; | |
887 | //if (TMath::Abs(y-3.08)>0.45) d+=dd; | |
888 | if (TMath::Abs(y-3.03)<0.10) {d+=0.014;} | |
a9a2d814 | 889 | } else |
890 | if (3<fR&&fR<5) { //SPD1 | |
61ab8ea8 | 891 | Double_t dd=0.0063; x0=21.5; |
892 | d=dd; | |
893 | if (TMath::Abs(y+0.21)>0.6) d+=dd; | |
894 | //if (TMath::Abs(y+0.21)>0.45) d+=dd; | |
895 | if (TMath::Abs(y+0.10)<0.10) {d+=0.014;} | |
a9a2d814 | 896 | } |
897 | ||
a9a2d814 | 898 | return d; |
899 | } | |
006b5f7f | 900 | |
a9a2d814 | 901 | Double_t AliITStrackerV2::GetEffectiveThickness(Double_t y,Double_t z) const |
006b5f7f | 902 | { |
903 | //-------------------------------------------------------------------- | |
a9a2d814 | 904 | //Returns the thickness between the current layer and the vertex (units X0) |
006b5f7f | 905 | //-------------------------------------------------------------------- |
61ab8ea8 | 906 | Double_t d=0.0028*3*3; //beam pipe |
907 | Double_t x0=0; | |
006b5f7f | 908 | |
18856a77 | 909 | Double_t xn=fgLayers[fI].GetR(); |
006b5f7f | 910 | for (Int_t i=0; i<fI; i++) { |
18856a77 | 911 | Double_t xi=fgLayers[i].GetR(); |
912 | d+=fgLayers[i].GetThickness(y,z,x0)*xi*xi; | |
006b5f7f | 913 | } |
914 | ||
915 | if (fI>1) { | |
61ab8ea8 | 916 | Double_t xi=9.; |
917 | d+=0.0097*xi*xi; | |
006b5f7f | 918 | } |
919 | ||
920 | if (fI>3) { | |
18856a77 | 921 | Double_t xi=0.5*(fgLayers[3].GetR()+fgLayers[4].GetR()); |
61ab8ea8 | 922 | d+=0.0034*xi*xi; |
006b5f7f | 923 | } |
61ab8ea8 | 924 | |
006b5f7f | 925 | return d/(xn*xn); |
926 | } | |
927 | ||
880f41b9 | 928 | Bool_t |
c630aafd | 929 | AliITStrackerV2::RefitAt(Double_t xx,AliITStrackV2 *t,const AliITStrackV2 *c) { |
4ab260d6 | 930 | //-------------------------------------------------------------------- |
c630aafd | 931 | // This function refits the track "t" at the position "x" using |
932 | // the clusters from "c" | |
4ab260d6 | 933 | //-------------------------------------------------------------------- |
880f41b9 | 934 | Int_t index[kMaxLayer]; |
935 | Int_t k; | |
936 | for (k=0; k<kMaxLayer; k++) index[k]=-1; | |
c630aafd | 937 | Int_t nc=c->GetNumberOfClusters(); |
880f41b9 | 938 | for (k=0; k<nc; k++) { |
c630aafd | 939 | Int_t idx=c->GetClusterIndex(k),nl=(idx&0xf0000000)>>28; |
880f41b9 | 940 | index[nl]=idx; |
941 | } | |
880f41b9 | 942 | |
4ab260d6 | 943 | Int_t from, to, step; |
ee34184f | 944 | if (xx > t->GetX()) { |
4ab260d6 | 945 | from=0; to=kMaxLayer; |
946 | step=+1; | |
947 | } else { | |
948 | from=kMaxLayer-1; to=-1; | |
949 | step=-1; | |
950 | } | |
951 | ||
952 | for (Int_t i=from; i != to; i += step) { | |
18856a77 | 953 | AliITSlayer &layer=fgLayers[i]; |
4ab260d6 | 954 | Double_t r=layer.GetR(); |
955 | ||
956 | { | |
957 | Double_t hI=i-0.5*step; | |
880f41b9 | 958 | if (TMath::Abs(hI-1.5)<0.01 || TMath::Abs(hI-3.5)<0.01) { |
18856a77 | 959 | Double_t rs=0.5*(fgLayers[i-step].GetR() + r); |
61ab8ea8 | 960 | Double_t d=0.0034, x0=38.6; |
880f41b9 | 961 | if (TMath::Abs(hI-1.5)<0.01) {rs=9.; d=0.0097; x0=42;} |
962 | if (!t->PropagateTo(rs,-step*d,x0)) { | |
4ab260d6 | 963 | return kFALSE; |
964 | } | |
965 | } | |
966 | } | |
967 | ||
880f41b9 | 968 | // remember old position [SR, GSI 18.02.2003] |
969 | Double_t oldX=0., oldY=0., oldZ=0.; | |
970 | if (t->IsStartedTimeIntegral() && step==1) { | |
971 | t->GetGlobalXYZat(t->GetX(),oldX,oldY,oldZ); | |
972 | } | |
973 | // | |
974 | ||
4ab260d6 | 975 | Double_t x,y,z; |
976 | if (!t->GetGlobalXYZat(r,x,y,z)) { | |
977 | return kFALSE; | |
978 | } | |
979 | Double_t phi=TMath::ATan2(y,x); | |
980 | Int_t idet=layer.FindDetectorIndex(phi,z); | |
981 | if (idet<0) { | |
982 | return kFALSE; | |
983 | } | |
984 | const AliITSdetector &det=layer.GetDetector(idet); | |
985 | phi=det.GetPhi(); | |
986 | if (!t->Propagate(phi,det.GetR())) { | |
987 | return kFALSE; | |
988 | } | |
989 | t->SetDetectorIndex(idet); | |
990 | ||
991 | const AliITSclusterV2 *cl=0; | |
992 | Double_t maxchi2=kMaxChi2; | |
993 | ||
994 | Int_t idx=index[i]; | |
995 | if (idx>0) { | |
996 | const AliITSclusterV2 *c=(AliITSclusterV2 *)GetCluster(idx); | |
997 | if (idet != c->GetDetectorIndex()) { | |
998 | idet=c->GetDetectorIndex(); | |
999 | const AliITSdetector &det=layer.GetDetector(idet); | |
1000 | if (!t->Propagate(det.GetPhi(),det.GetR())) { | |
1001 | return kFALSE; | |
1002 | } | |
1003 | t->SetDetectorIndex(idet); | |
1004 | } | |
1005 | Double_t chi2=t->GetPredictedChi2(c); | |
c630aafd | 1006 | if (chi2<maxchi2) { |
1007 | cl=c; | |
1008 | maxchi2=chi2; | |
1009 | } else { | |
1010 | return kFALSE; | |
1011 | } | |
4ab260d6 | 1012 | } |
4ab260d6 | 1013 | /* |
1014 | if (cl==0) | |
1015 | if (t->GetNumberOfClusters()>2) { | |
1016 | Double_t dz=4*TMath::Sqrt(t->GetSigmaZ2()+kSigmaZ2[i]); | |
1017 | Double_t dy=4*TMath::Sqrt(t->GetSigmaY2()+kSigmaY2[i]); | |
1018 | Double_t zmin=t->GetZ() - dz; | |
1019 | Double_t zmax=t->GetZ() + dz; | |
1020 | Double_t ymin=t->GetY() + phi*r - dy; | |
1021 | Double_t ymax=t->GetY() + phi*r + dy; | |
1022 | layer.SelectClusters(zmin,zmax,ymin,ymax); | |
1023 | ||
1024 | const AliITSclusterV2 *c=0; Int_t ci=-1; | |
1025 | while ((c=layer.GetNextCluster(ci))!=0) { | |
1026 | if (idet != c->GetDetectorIndex()) continue; | |
1027 | Double_t chi2=t->GetPredictedChi2(c); | |
1028 | if (chi2<maxchi2) { cl=c; maxchi2=chi2; idx=ci; } | |
1029 | } | |
1030 | } | |
1031 | */ | |
4ab260d6 | 1032 | if (cl) { |
1033 | if (!t->Update(cl,maxchi2,idx)) { | |
1034 | return kFALSE; | |
1035 | } | |
880f41b9 | 1036 | t->SetSampledEdx(cl->GetQ(),t->GetNumberOfClusters()-1); |
4ab260d6 | 1037 | } |
1038 | ||
1039 | { | |
61ab8ea8 | 1040 | Double_t x0; |
1041 | Double_t d=layer.GetThickness(t->GetY(),t->GetZ(),x0); | |
1042 | t->CorrectForMaterial(-step*d,x0); | |
4ab260d6 | 1043 | } |
880f41b9 | 1044 | |
1045 | // track time update [SR, GSI 17.02.2003] | |
1046 | if (t->IsStartedTimeIntegral() && step==1) { | |
1047 | Double_t newX, newY, newZ; | |
1048 | t->GetGlobalXYZat(t->GetX(),newX,newY,newZ); | |
1049 | Double_t dL2 = (oldX-newX)*(oldX-newX) + (oldY-newY)*(oldY-newY) + | |
1050 | (oldZ-newZ)*(oldZ-newZ); | |
1051 | t->AddTimeStep(TMath::Sqrt(dL2)); | |
1052 | } | |
1053 | // | |
4ab260d6 | 1054 | |
1055 | } | |
1056 | ||
ee34184f | 1057 | if (!t->PropagateTo(xx,0.,0.)) return kFALSE; |
4ab260d6 | 1058 | return kTRUE; |
1059 | } | |
1060 | ||
b87bd7cd | 1061 | void AliITStrackerV2::UseClusters(const AliKalmanTrack *t, Int_t from) const { |
1062 | //-------------------------------------------------------------------- | |
1063 | // This function marks clusters assigned to the track | |
1064 | //-------------------------------------------------------------------- | |
1065 | AliTracker::UseClusters(t,from); | |
880f41b9 | 1066 | |
b87bd7cd | 1067 | AliITSclusterV2 *c=(AliITSclusterV2 *)GetCluster(t->GetClusterIndex(0)); |
c219fd63 | 1068 | if (c->GetSigmaZ2()>0.1) c->UnUse(); |
b87bd7cd | 1069 | c=(AliITSclusterV2 *)GetCluster(t->GetClusterIndex(1)); |
c219fd63 | 1070 | if (c->GetSigmaZ2()>0.1) c->UnUse(); |
880f41b9 | 1071 | |
b87bd7cd | 1072 | } |