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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 | **************************************************************************/ | |
a5d0fae6 | 15 | /* $Id$ */ |
006b5f7f | 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" |
af885e0f | 35 | #include "AliESDEvent.h" |
aad72f45 | 36 | #include "AliESDtrack.h" |
00a7cc50 | 37 | #include "AliITSRecPoint.h" |
44347160 | 38 | #include "AliITSReconstructor.h" |
006b5f7f | 39 | #include "AliITStrackerV2.h" |
40 | ||
8676d691 | 41 | ClassImp(AliITStrackerV2) |
006b5f7f | 42 | |
e50912db | 43 | AliITStrackerV2::AliITSlayer AliITStrackerV2::fgLayers[AliITSgeomTGeo::kNLayers]; //ITS layers |
006b5f7f | 44 | |
6c94f330 | 45 | AliITStrackerV2::AliITStrackerV2(): |
46 | AliTracker(), | |
e50912db | 47 | fI(AliITSgeomTGeo::GetNLayers()), |
6c94f330 | 48 | fBestTrack(), |
49 | fTrackToFollow(), | |
50 | fPass(0), | |
e50912db | 51 | fLastLayerToTrackTo(AliITSRecoParam::GetLastLayerToTrackTo()) |
6c94f330 | 52 | { |
53 | //-------------------------------------------------------------------- | |
54 | //This is the AliITStrackerV2 default constructor | |
55 | //-------------------------------------------------------------------- | |
56 | ||
e50912db | 57 | for (Int_t i=1; i<AliITSgeomTGeo::GetNLayers()+1; i++) new(fgLayers+i-1) AliITSlayer(); |
6c94f330 | 58 | |
59 | fConstraint[0]=1; fConstraint[1]=0; | |
60 | ||
44347160 | 61 | Double_t xyz[]={AliITSReconstructor::GetRecoParam()->GetXVdef(), |
62 | AliITSReconstructor::GetRecoParam()->GetYVdef(), | |
63 | AliITSReconstructor::GetRecoParam()->GetZVdef()}; | |
64 | Double_t ers[]={AliITSReconstructor::GetRecoParam()->GetSigmaXVdef(), | |
65 | AliITSReconstructor::GetRecoParam()->GetSigmaYVdef(), | |
66 | AliITSReconstructor::GetRecoParam()->GetSigmaZVdef()}; | |
6c94f330 | 67 | SetVertex(xyz,ers); |
68 | ||
e50912db | 69 | for (Int_t i=0; i<AliITSgeomTGeo::GetNLayers(); i++) fLayersNotToSkip[i]=AliITSRecoParam::GetLayersNotToSkip(i); |
6c94f330 | 70 | |
71 | } | |
72 | ||
73 | AliITStrackerV2::AliITStrackerV2(const AliITStrackerV2 &t): | |
74 | AliTracker(t), | |
75 | fI(t.fI), | |
76 | fBestTrack(t.fBestTrack), | |
77 | fTrackToFollow(t.fTrackToFollow), | |
78 | fPass(t.fPass), | |
79 | fLastLayerToTrackTo(t.fLastLayerToTrackTo) | |
80 | { | |
81 | //-------------------------------------------------------------------- | |
82 | //This is the AliITStrackerV2 copy constructor | |
83 | //-------------------------------------------------------------------- | |
84 | ||
e50912db | 85 | //for (Int_t i=1; i<AliITSgeomTGeo::GetNLayers()+1; i++) new(fgLayers+i-1) AliITSlayer(); |
6c94f330 | 86 | |
87 | fConstraint[0]=t.fConstraint[0]; fConstraint[1]=t.fConstraint[1]; | |
88 | ||
44347160 | 89 | Double_t xyz[]={AliITSReconstructor::GetRecoParam()->GetXVdef(), |
90 | AliITSReconstructor::GetRecoParam()->GetYVdef(), | |
91 | AliITSReconstructor::GetRecoParam()->GetZVdef()}; | |
92 | Double_t ers[]={AliITSReconstructor::GetRecoParam()->GetSigmaXVdef(), | |
93 | AliITSReconstructor::GetRecoParam()->GetSigmaYVdef(), | |
94 | AliITSReconstructor::GetRecoParam()->GetSigmaZVdef()}; | |
6c94f330 | 95 | xyz[0]=t.GetX(); xyz[1]=t.GetY(); xyz[2]=t.GetZ(); |
96 | ers[0]=t.GetSigmaX(); ers[1]=t.GetSigmaY(); ers[2]=t.GetSigmaZ(); | |
97 | SetVertex(xyz,ers); | |
98 | ||
e50912db | 99 | for (Int_t i=0; i<AliITSgeomTGeo::GetNLayers(); i++) fLayersNotToSkip[i]=t.fLayersNotToSkip[i]; |
6c94f330 | 100 | |
101 | } | |
102 | ||
1f3e997f | 103 | AliITStrackerV2::AliITStrackerV2(const Char_t *geom) : |
6c94f330 | 104 | AliTracker(), |
e50912db | 105 | fI(AliITSgeomTGeo::GetNLayers()), |
6c94f330 | 106 | fBestTrack(), |
107 | fTrackToFollow(), | |
108 | fPass(0), | |
e50912db | 109 | fLastLayerToTrackTo(AliITSRecoParam::GetLastLayerToTrackTo()) |
6c94f330 | 110 | { |
006b5f7f | 111 | //-------------------------------------------------------------------- |
61ab8ea8 | 112 | //This is the AliITStrackerV2 constructor |
006b5f7f | 113 | //-------------------------------------------------------------------- |
e341247d | 114 | if (geom) { |
115 | AliWarning("\"geom\" is actually a dummy argument !"); | |
116 | } | |
006b5f7f | 117 | |
e50912db | 118 | for (Int_t i=1; i<AliITSgeomTGeo::GetNLayers()+1; i++) { |
e341247d | 119 | Int_t nlad=AliITSgeomTGeo::GetNLadders(i); |
120 | Int_t ndet=AliITSgeomTGeo::GetNDetectors(i); | |
006b5f7f | 121 | |
e341247d | 122 | Double_t xyz[3], &x=xyz[0], &y=xyz[1], &z=xyz[2]; |
123 | AliITSgeomTGeo::GetOrigTranslation(i,1,1,xyz); | |
006b5f7f | 124 | Double_t poff=TMath::ATan2(y,x); |
125 | Double_t zoff=z; | |
a504d56f | 126 | Double_t r=TMath::Sqrt(x*x + y*y); |
006b5f7f | 127 | |
e341247d | 128 | AliITSgeomTGeo::GetOrigTranslation(i,1,2,xyz); |
006b5f7f | 129 | r += TMath::Sqrt(x*x + y*y); |
e341247d | 130 | AliITSgeomTGeo::GetOrigTranslation(i,2,1,xyz); |
006b5f7f | 131 | r += TMath::Sqrt(x*x + y*y); |
e341247d | 132 | AliITSgeomTGeo::GetOrigTranslation(i,2,2,xyz); |
006b5f7f | 133 | r += TMath::Sqrt(x*x + y*y); |
134 | r*=0.25; | |
135 | ||
18856a77 | 136 | new (fgLayers+i-1) AliITSlayer(r,poff,zoff,nlad,ndet); |
006b5f7f | 137 | |
138 | for (Int_t j=1; j<nlad+1; j++) { | |
139 | for (Int_t k=1; k<ndet+1; k++) { //Fill this layer with detectors | |
e341247d | 140 | TGeoHMatrix m; AliITSgeomTGeo::GetOrigMatrix(i,j,k,m); |
1f3e997f | 141 | const TGeoHMatrix *tm=AliITSgeomTGeo::GetTracking2LocalMatrix(i,j,k); |
142 | m.Multiply(tm); | |
a5d0fae6 | 143 | Double_t txyz[3]={0.}; |
144 | xyz[0]=0.; xyz[1]=0.; xyz[2]=0.; | |
1f3e997f | 145 | m.LocalToMaster(txyz,xyz); |
a5d0fae6 | 146 | r=TMath::Sqrt(xyz[0]*xyz[0] + xyz[1]*xyz[1]); |
1f3e997f | 147 | Double_t phi=TMath::ATan2(xyz[1],xyz[0]); |
c219fd63 | 148 | |
149 | if (phi<0) phi+=TMath::TwoPi(); | |
150 | else if (phi>=TMath::TwoPi()) phi-=TMath::TwoPi(); | |
151 | ||
18856a77 | 152 | AliITSdetector &det=fgLayers[i-1].GetDetector((j-1)*ndet + k-1); |
006b5f7f | 153 | new(&det) AliITSdetector(r,phi); |
154 | } | |
155 | } | |
c630aafd | 156 | |
006b5f7f | 157 | } |
158 | ||
c219fd63 | 159 | fConstraint[0]=1; fConstraint[1]=0; |
8676d691 | 160 | |
44347160 | 161 | Double_t xyz[]={AliITSReconstructor::GetRecoParam()->GetXVdef(), |
162 | AliITSReconstructor::GetRecoParam()->GetYVdef(), | |
163 | AliITSReconstructor::GetRecoParam()->GetZVdef()}; | |
164 | Double_t ers[]={AliITSReconstructor::GetRecoParam()->GetSigmaXVdef(), | |
165 | AliITSReconstructor::GetRecoParam()->GetSigmaYVdef(), | |
166 | AliITSReconstructor::GetRecoParam()->GetSigmaZVdef()}; | |
8676d691 | 167 | SetVertex(xyz,ers); |
c0dd5278 | 168 | |
e50912db | 169 | for (Int_t i=0; i<AliITSgeomTGeo::GetNLayers(); i++) fLayersNotToSkip[i]=AliITSRecoParam::GetLayersNotToSkip(i); |
c0dd5278 | 170 | |
171 | } | |
172 | ||
173 | void AliITStrackerV2::SetLayersNotToSkip(Int_t *l) { | |
174 | //-------------------------------------------------------------------- | |
175 | //This function set masks of the layers which must be not skipped | |
176 | //-------------------------------------------------------------------- | |
e50912db | 177 | for (Int_t i=0; i<AliITSgeomTGeo::GetNLayers(); i++) fLayersNotToSkip[i]=l[i]; |
61ab8ea8 | 178 | } |
006b5f7f | 179 | |
c630aafd | 180 | Int_t AliITStrackerV2::LoadClusters(TTree *cTree) { |
61ab8ea8 | 181 | //-------------------------------------------------------------------- |
182 | //This function loads ITS clusters | |
183 | //-------------------------------------------------------------------- | |
00a7cc50 | 184 | TBranch *branch=cTree->GetBranch("ITSRecPoints"); |
61ab8ea8 | 185 | if (!branch) { |
c630aafd | 186 | Error("LoadClusters"," can't get the branch !\n"); |
8676d691 | 187 | return 1; |
61ab8ea8 | 188 | } |
006b5f7f | 189 | |
00a7cc50 | 190 | TClonesArray dummy("AliITSRecPoint",10000), *clusters=&dummy; |
61ab8ea8 | 191 | branch->SetAddress(&clusters); |
006b5f7f | 192 | |
61ab8ea8 | 193 | Int_t j=0; |
e50912db | 194 | for (Int_t i=0; i<AliITSgeomTGeo::GetNLayers(); i++) { |
18856a77 | 195 | Int_t ndet=fgLayers[i].GetNdetectors(); |
196 | Int_t jmax = j + fgLayers[i].GetNladders()*ndet; | |
c219fd63 | 197 | |
198 | Double_t r=fgLayers[i].GetR(); | |
199 | Double_t circ=TMath::TwoPi()*r; | |
200 | ||
61ab8ea8 | 201 | for (; j<jmax; j++) { |
202 | if (!cTree->GetEvent(j)) continue; | |
203 | Int_t ncl=clusters->GetEntriesFast(); | |
1f3e997f | 204 | |
61ab8ea8 | 205 | while (ncl--) { |
00a7cc50 | 206 | AliITSRecPoint *c=(AliITSRecPoint*)clusters->UncheckedAt(ncl); |
c219fd63 | 207 | |
75fb37cc | 208 | if (!c->Misalign()) AliWarning("Can't misalign this cluster !"); |
1f3e997f | 209 | |
c219fd63 | 210 | Int_t idx=c->GetDetectorIndex(); |
a504d56f | 211 | AliITSdetector &det=fgLayers[i].GetDetector(idx); |
212 | ||
a504d56f | 213 | Double_t y=r*det.GetPhi()+c->GetY(); |
c219fd63 | 214 | if (y>circ) y-=circ; else if (y<0) y+=circ; |
215 | c->SetPhiR(y); | |
216 | ||
00a7cc50 | 217 | fgLayers[i].InsertCluster(new AliITSRecPoint(*c)); |
61ab8ea8 | 218 | } |
219 | clusters->Delete(); | |
220 | } | |
18856a77 | 221 | fgLayers[i].ResetRoad(); //road defined by the cluster density |
006b5f7f | 222 | } |
c630aafd | 223 | |
8676d691 | 224 | return 0; |
61ab8ea8 | 225 | } |
006b5f7f | 226 | |
61ab8ea8 | 227 | void AliITStrackerV2::UnloadClusters() { |
228 | //-------------------------------------------------------------------- | |
229 | //This function unloads ITS clusters | |
230 | //-------------------------------------------------------------------- | |
e50912db | 231 | for (Int_t i=0; i<AliITSgeomTGeo::GetNLayers(); i++) fgLayers[i].ResetClusters(); |
006b5f7f | 232 | } |
233 | ||
880f41b9 | 234 | static Int_t CorrectForDeadZoneMaterial(AliITStrackV2 *t) { |
235 | //-------------------------------------------------------------------- | |
236 | // Correction for the material between the TPC and the ITS | |
237 | // (should it belong to the TPC code ?) | |
238 | //-------------------------------------------------------------------- | |
239 | Double_t riw=80., diw=0.0053, x0iw=30; // TPC inner wall ? | |
240 | Double_t rcd=61., dcd=0.0053, x0cd=30; // TPC "central drum" ? | |
241 | Double_t yr=12.8, dr=0.03; // rods ? | |
242 | Double_t zm=0.2, dm=0.40; // membrane | |
243 | //Double_t rr=52., dr=0.19, x0r=24., yyr=7.77; //rails | |
244 | Double_t rs=50., ds=0.001; // something belonging to the ITS (screen ?) | |
245 | ||
246 | if (t->GetX() > riw) { | |
247 | if (!t->PropagateTo(riw,diw,x0iw)) return 1; | |
248 | if (TMath::Abs(t->GetY())>yr) t->CorrectForMaterial(dr); | |
249 | if (TMath::Abs(t->GetZ())<zm) t->CorrectForMaterial(dm); | |
250 | if (!t->PropagateTo(rcd,dcd,x0cd)) return 1; | |
251 | //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z); | |
252 | //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,dr,x0r); | |
253 | if (!t->PropagateTo(rs,ds)) return 1; | |
254 | } else if (t->GetX() < rs) { | |
255 | if (!t->PropagateTo(rs,-ds)) return 1; | |
256 | //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z); | |
257 | //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,-dr,x0r); | |
258 | if (!t->PropagateTo(rcd,-dcd,x0cd)) return 1; | |
ba1a3e1a | 259 | if (!t->PropagateTo(riw+0.001,-diw,x0iw)) return 1; |
880f41b9 | 260 | } else { |
261 | ::Error("CorrectForDeadZoneMaterial","track is already in the dead zone !"); | |
262 | return 1; | |
263 | } | |
264 | ||
265 | return 0; | |
266 | } | |
267 | ||
af885e0f | 268 | Int_t AliITStrackerV2::Clusters2Tracks(AliESDEvent *event) { |
006b5f7f | 269 | //-------------------------------------------------------------------- |
c630aafd | 270 | // This functions reconstructs ITS tracks |
271 | // The clusters must be already loaded ! | |
006b5f7f | 272 | //-------------------------------------------------------------------- |
c630aafd | 273 | TObjArray itsTracks(15000); |
006b5f7f | 274 | |
c630aafd | 275 | {/* Read ESD tracks */ |
276 | Int_t nentr=event->GetNumberOfTracks(); | |
277 | Info("Clusters2Tracks", "Number of ESD tracks: %d\n", nentr); | |
278 | while (nentr--) { | |
279 | AliESDtrack *esd=event->GetTrack(nentr); | |
280 | ||
ba1a3e1a | 281 | if ((esd->GetStatus()&AliESDtrack::kTPCin)==0) continue; |
282 | if (esd->GetStatus()&AliESDtrack::kTPCout) continue; | |
283 | if (esd->GetStatus()&AliESDtrack::kITSin) continue; | |
c630aafd | 284 | |
285 | AliITStrackV2 *t=0; | |
286 | try { | |
287 | t=new AliITStrackV2(*esd); | |
288 | } catch (const Char_t *msg) { | |
289 | Warning("Clusters2Tracks",msg); | |
290 | delete t; | |
291 | continue; | |
292 | } | |
6c94f330 | 293 | if (TMath::Abs(t->GetD(GetX(),GetY()))>4) { |
ebd8369c | 294 | delete t; |
295 | continue; | |
296 | } | |
006b5f7f | 297 | |
c630aafd | 298 | if (CorrectForDeadZoneMaterial(t)!=0) { |
299 | Warning("Clusters2Tracks", | |
300 | "failed to correct for the material in the dead zone !\n"); | |
301 | delete t; | |
302 | continue; | |
303 | } | |
304 | itsTracks.AddLast(t); | |
305 | } | |
306 | } /* End Read ESD tracks */ | |
307 | ||
308 | itsTracks.Sort(); | |
309 | Int_t nentr=itsTracks.GetEntriesFast(); | |
15dd636f | 310 | |
c630aafd | 311 | Int_t ntrk=0; |
312 | for (fPass=0; fPass<2; fPass++) { | |
313 | Int_t &constraint=fConstraint[fPass]; if (constraint<0) continue; | |
314 | for (Int_t i=0; i<nentr; i++) { | |
315 | AliITStrackV2 *t=(AliITStrackV2*)itsTracks.UncheckedAt(i); | |
15dd636f | 316 | if (t==0) continue; //this track has been already tracked |
c630aafd | 317 | Int_t tpcLabel=t->GetLabel(); //save the TPC track label |
318 | ||
319 | ResetTrackToFollow(*t); | |
320 | ResetBestTrack(); | |
321 | ||
e50912db | 322 | for (FollowProlongation(); fI<AliITSgeomTGeo::GetNLayers(); fI++) { |
15dd636f | 323 | while (TakeNextProlongation()) FollowProlongation(); |
c630aafd | 324 | } |
325 | ||
de5d3595 | 326 | if (fBestTrack.GetNumberOfClusters() == 0) continue; |
15dd636f | 327 | |
c630aafd | 328 | if (fConstraint[fPass]) { |
15dd636f | 329 | ResetTrackToFollow(*t); |
330 | if (!RefitAt(3.7, &fTrackToFollow, &fBestTrack)) continue; | |
331 | ResetBestTrack(); | |
332 | } | |
333 | ||
c630aafd | 334 | fBestTrack.SetLabel(tpcLabel); |
335 | fBestTrack.CookdEdx(); | |
336 | CookLabel(&fBestTrack,0.); //For comparison only | |
337 | fBestTrack.UpdateESDtrack(AliESDtrack::kITSin); | |
15dd636f | 338 | UseClusters(&fBestTrack); |
c630aafd | 339 | delete itsTracks.RemoveAt(i); |
340 | ntrk++; | |
341 | } | |
342 | } | |
babd135a | 343 | |
c630aafd | 344 | itsTracks.Delete(); |
2257f27e | 345 | |
c630aafd | 346 | Info("Clusters2Tracks","Number of prolonged tracks: %d\n",ntrk); |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
af885e0f | 351 | Int_t AliITStrackerV2::PropagateBack(AliESDEvent *event) { |
c630aafd | 352 | //-------------------------------------------------------------------- |
353 | // This functions propagates reconstructed ITS tracks back | |
354 | // The clusters must be loaded ! | |
355 | //-------------------------------------------------------------------- | |
356 | Int_t nentr=event->GetNumberOfTracks(); | |
357 | Info("PropagateBack", "Number of ESD tracks: %d\n", nentr); | |
358 | ||
359 | Int_t ntrk=0; | |
360 | for (Int_t i=0; i<nentr; i++) { | |
361 | AliESDtrack *esd=event->GetTrack(i); | |
362 | ||
ba1a3e1a | 363 | if ((esd->GetStatus()&AliESDtrack::kITSin)==0) continue; |
364 | if (esd->GetStatus()&AliESDtrack::kITSout) continue; | |
c630aafd | 365 | |
366 | AliITStrackV2 *t=0; | |
367 | try { | |
368 | t=new AliITStrackV2(*esd); | |
369 | } catch (const Char_t *msg) { | |
370 | Warning("PropagateBack",msg); | |
371 | delete t; | |
372 | continue; | |
373 | } | |
374 | ||
375 | ResetTrackToFollow(*t); | |
376 | ||
377 | // propagete to vertex [SR, GSI 17.02.2003] | |
a9459f9c | 378 | // Start Time measurement [SR, GSI 17.02.2003], corrected by I.Belikov |
379 | if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) { | |
6c94f330 | 380 | if (fTrackToFollow.PropagateToVertex(event->GetVertex())) { |
a9459f9c | 381 | fTrackToFollow.StartTimeIntegral(); |
382 | } | |
383 | fTrackToFollow.PropagateTo(3.,-0.0028,65.19); | |
384 | } | |
c630aafd | 385 | |
6c94f330 | 386 | fTrackToFollow.ResetCovariance(10.); fTrackToFollow.ResetClusters(); |
c630aafd | 387 | if (RefitAt(49.,&fTrackToFollow,t)) { |
388 | if (CorrectForDeadZoneMaterial(&fTrackToFollow)!=0) { | |
389 | Warning("PropagateBack", | |
390 | "failed to correct for the material in the dead zone !\n"); | |
391 | delete t; | |
392 | continue; | |
393 | } | |
394 | fTrackToFollow.SetLabel(t->GetLabel()); | |
ba1a3e1a | 395 | //fTrackToFollow.CookdEdx(); |
c630aafd | 396 | CookLabel(&fTrackToFollow,0.); //For comparison only |
397 | fTrackToFollow.UpdateESDtrack(AliESDtrack::kITSout); | |
15dd636f | 398 | UseClusters(&fTrackToFollow); |
c630aafd | 399 | ntrk++; |
400 | } | |
401 | delete t; | |
402 | } | |
403 | ||
404 | Info("PropagateBack","Number of back propagated ITS tracks: %d\n",ntrk); | |
61ab8ea8 | 405 | |
83d73500 | 406 | return 0; |
407 | } | |
408 | ||
af885e0f | 409 | Int_t AliITStrackerV2::RefitInward(AliESDEvent *event) { |
83d73500 | 410 | //-------------------------------------------------------------------- |
411 | // This functions refits ITS tracks using the | |
412 | // "inward propagated" TPC tracks | |
c630aafd | 413 | // The clusters must be loaded ! |
83d73500 | 414 | //-------------------------------------------------------------------- |
c630aafd | 415 | Int_t nentr=event->GetNumberOfTracks(); |
416 | Info("RefitInward", "Number of ESD tracks: %d\n", nentr); | |
417 | ||
418 | Int_t ntrk=0; | |
419 | for (Int_t i=0; i<nentr; i++) { | |
420 | AliESDtrack *esd=event->GetTrack(i); | |
421 | ||
ba1a3e1a | 422 | if ((esd->GetStatus()&AliESDtrack::kITSout) == 0) continue; |
423 | if (esd->GetStatus()&AliESDtrack::kITSrefit) continue; | |
424 | if (esd->GetStatus()&AliESDtrack::kTPCout) | |
15dd636f | 425 | if ((esd->GetStatus()&AliESDtrack::kTPCrefit)==0) continue; |
c630aafd | 426 | |
427 | AliITStrackV2 *t=0; | |
428 | try { | |
429 | t=new AliITStrackV2(*esd); | |
430 | } catch (const Char_t *msg) { | |
431 | Warning("RefitInward",msg); | |
432 | delete t; | |
433 | continue; | |
434 | } | |
435 | ||
436 | if (CorrectForDeadZoneMaterial(t)!=0) { | |
437 | Warning("RefitInward", | |
438 | "failed to correct for the material in the dead zone !\n"); | |
439 | delete t; | |
440 | continue; | |
441 | } | |
442 | ||
443 | ResetTrackToFollow(*t); | |
444 | fTrackToFollow.ResetClusters(); | |
445 | ||
446 | //Refitting... | |
ef7253ac | 447 | if (RefitAt(3.7, &fTrackToFollow, t, kTRUE)) { |
c630aafd | 448 | fTrackToFollow.SetLabel(t->GetLabel()); |
449 | fTrackToFollow.CookdEdx(); | |
15dd636f | 450 | CookLabel(&fTrackToFollow,0.); //For comparison only |
18856a77 | 451 | |
49d13e89 | 452 | if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) {//The beam pipe |
09cf9d66 | 453 | fTrackToFollow.UpdateESDtrack(AliESDtrack::kITSrefit); |
49d13e89 | 454 | AliESDtrack *esdTrack =fTrackToFollow.GetESDtrack(); |
f7a1cc68 | 455 | Double_t r[3]={0.,0.,0.}; |
49d13e89 | 456 | Double_t maxD=3.; |
457 | esdTrack->RelateToVertex(event->GetVertex(),GetBz(r),maxD); | |
458 | ntrk++; | |
67c3dcbe | 459 | } |
c630aafd | 460 | } |
461 | delete t; | |
462 | } | |
463 | ||
464 | Info("RefitInward","Number of refitted tracks: %d\n",ntrk); | |
83d73500 | 465 | |
c630aafd | 466 | return 0; |
467 | } | |
83d73500 | 468 | |
006b5f7f | 469 | AliCluster *AliITStrackerV2::GetCluster(Int_t index) const { |
470 | //-------------------------------------------------------------------- | |
471 | // Return pointer to a given cluster | |
472 | //-------------------------------------------------------------------- | |
473 | Int_t l=(index & 0xf0000000) >> 28; | |
474 | Int_t c=(index & 0x0fffffff) >> 00; | |
18856a77 | 475 | return fgLayers[l].GetCluster(c); |
006b5f7f | 476 | } |
477 | ||
478 | ||
479 | void AliITStrackerV2::FollowProlongation() { | |
480 | //-------------------------------------------------------------------- | |
481 | //This function finds a track prolongation | |
482 | //-------------------------------------------------------------------- | |
c0dd5278 | 483 | while (fI>fLastLayerToTrackTo) { |
a9a2d814 | 484 | Int_t i=fI-1; |
8676d691 | 485 | |
18856a77 | 486 | AliITSlayer &layer=fgLayers[i]; |
a9a2d814 | 487 | AliITStrackV2 &track=fTracks[i]; |
006b5f7f | 488 | |
14825d5a | 489 | Double_t r=layer.GetR(); |
61ab8ea8 | 490 | |
a9a2d814 | 491 | if (i==3 || i==1) { |
18856a77 | 492 | Double_t rs=0.5*(fgLayers[i+1].GetR() + r); |
61ab8ea8 | 493 | Double_t d=0.0034, x0=38.6; |
494 | if (i==1) {rs=9.; d=0.0097; x0=42;} | |
495 | if (!fTrackToFollow.PropagateTo(rs,d,x0)) { | |
8676d691 | 496 | //Warning("FollowProlongation","propagation failed !\n"); |
c0dd5278 | 497 | return; |
a9a2d814 | 498 | } |
006b5f7f | 499 | } |
500 | ||
501 | //find intersection | |
8602c008 | 502 | Double_t phi,z; |
503 | if (!fTrackToFollow.GetPhiZat(r,phi,z)) { | |
8676d691 | 504 | //Warning("FollowProlongation","failed to estimate track !\n"); |
c0dd5278 | 505 | return; |
006b5f7f | 506 | } |
f363d377 | 507 | |
006b5f7f | 508 | Int_t idet=layer.FindDetectorIndex(phi,z); |
509 | if (idet<0) { | |
8676d691 | 510 | //Warning("FollowProlongation","failed to find a detector !\n"); |
c0dd5278 | 511 | return; |
006b5f7f | 512 | } |
513 | ||
514 | //propagate to the intersection | |
515 | const AliITSdetector &det=layer.GetDetector(idet); | |
14825d5a | 516 | phi=det.GetPhi(); |
a9a2d814 | 517 | if (!fTrackToFollow.Propagate(phi,det.GetR())) { |
8676d691 | 518 | //Warning("FollowProlongation","propagation failed !\n"); |
c0dd5278 | 519 | return; |
006b5f7f | 520 | } |
521 | fTrackToFollow.SetDetectorIndex(idet); | |
522 | ||
523 | //Select possible prolongations and store the current track estimation | |
524 | track.~AliITStrackV2(); new(&track) AliITStrackV2(fTrackToFollow); | |
44347160 | 525 | Double_t dz=7*TMath::Sqrt(track.GetSigmaZ2() + AliITSReconstructor::GetRecoParam()->GetSigmaZ2(i)); |
526 | Double_t dy=7*TMath::Sqrt(track.GetSigmaY2() + AliITSReconstructor::GetRecoParam()->GetSigmaY2(i)); | |
8676d691 | 527 | Double_t road=layer.GetRoad(); |
528 | if (dz*dy>road*road) { | |
529 | Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd; | |
530 | dz=road*scz; dy=road*scy; | |
531 | } | |
b87bd7cd | 532 | |
44347160 | 533 | //Double_t dz=4*TMath::Sqrt(track.GetSigmaZ2() + AliITSReconstructor::GetRecoParam()->GetSigmaZ2(i)); |
14825d5a | 534 | if (dz < 0.5*TMath::Abs(track.GetTgl())) dz=0.5*TMath::Abs(track.GetTgl()); |
44347160 | 535 | if (dz > AliITSReconstructor::GetRecoParam()->GetMaxRoad()) { |
8676d691 | 536 | //Warning("FollowProlongation","too broad road in Z !\n"); |
c0dd5278 | 537 | return; |
006b5f7f | 538 | } |
a9a2d814 | 539 | |
15dd636f | 540 | if (TMath::Abs(fTrackToFollow.GetZ()-GetZ()) > r+dz) return; |
a9a2d814 | 541 | |
44347160 | 542 | //Double_t dy=4*TMath::Sqrt(track.GetSigmaY2() + AliITSReconstructor::GetRecoParam()->GetSigmaY2(i)); |
14825d5a | 543 | if (dy < 0.5*TMath::Abs(track.GetSnp())) dy=0.5*TMath::Abs(track.GetSnp()); |
44347160 | 544 | if (dy > AliITSReconstructor::GetRecoParam()->GetMaxRoad()) { |
8676d691 | 545 | //Warning("FollowProlongation","too broad road in Y !\n"); |
c0dd5278 | 546 | return; |
006b5f7f | 547 | } |
a9a2d814 | 548 | |
c219fd63 | 549 | fI--; |
550 | ||
7f6ddf58 | 551 | Double_t zmin=track.GetZ() - dz; |
006b5f7f | 552 | Double_t zmax=track.GetZ() + dz; |
14825d5a | 553 | Double_t ymin=track.GetY() + r*phi - dy; |
554 | Double_t ymax=track.GetY() + r*phi + dy; | |
c219fd63 | 555 | if (layer.SelectClusters(zmin,zmax,ymin,ymax)==0) |
556 | if (fLayersNotToSkip[fI]) return; | |
006b5f7f | 557 | |
15dd636f | 558 | if (!TakeNextProlongation()) |
559 | if (fLayersNotToSkip[fI]) return; | |
560 | ||
006b5f7f | 561 | } |
562 | ||
563 | //deal with the best track | |
564 | Int_t ncl=fTrackToFollow.GetNumberOfClusters(); | |
565 | Int_t nclb=fBestTrack.GetNumberOfClusters(); | |
15dd636f | 566 | if (ncl) |
567 | if (ncl >= nclb) { | |
568 | Double_t chi2=fTrackToFollow.GetChi2(); | |
44347160 | 569 | if (chi2/ncl < AliITSReconstructor::GetRecoParam()->GetChi2PerCluster()) { |
15dd636f | 570 | if (ncl > nclb || chi2 < fBestTrack.GetChi2()) { |
571 | ResetBestTrack(); | |
006b5f7f | 572 | } |
15dd636f | 573 | } |
006b5f7f | 574 | } |
15dd636f | 575 | |
006b5f7f | 576 | } |
577 | ||
006b5f7f | 578 | Int_t AliITStrackerV2::TakeNextProlongation() { |
579 | //-------------------------------------------------------------------- | |
a9a2d814 | 580 | // This function takes another track prolongation |
581 | // | |
582 | // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch | |
006b5f7f | 583 | //-------------------------------------------------------------------- |
18856a77 | 584 | AliITSlayer &layer=fgLayers[fI]; |
4ab260d6 | 585 | ResetTrackToFollow(fTracks[fI]); |
006b5f7f | 586 | |
44347160 | 587 | Double_t dz=7*TMath::Sqrt(fTrackToFollow.GetSigmaZ2() + AliITSReconstructor::GetRecoParam()->GetSigmaZ2(fI)); |
588 | Double_t dy=7*TMath::Sqrt(fTrackToFollow.GetSigmaY2() + AliITSReconstructor::GetRecoParam()->GetSigmaY2(fI)); | |
8676d691 | 589 | Double_t road=layer.GetRoad(); |
590 | if (dz*dy>road*road) { | |
591 | Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd; | |
592 | dz=road*scz; dy=road*scy; | |
593 | } | |
006b5f7f | 594 | |
00a7cc50 | 595 | const AliITSRecPoint *c=0; Int_t ci=-1; |
596 | const AliITSRecPoint *cc=0; Int_t cci=-1; | |
44347160 | 597 | Double_t chi2=AliITSReconstructor::GetRecoParam()->GetMaxChi2(); |
006b5f7f | 598 | while ((c=layer.GetNextCluster(ci))!=0) { |
006b5f7f | 599 | Int_t idet=c->GetDetectorIndex(); |
15dd636f | 600 | |
4ab260d6 | 601 | if (fTrackToFollow.GetDetectorIndex()!=idet) { |
006b5f7f | 602 | const AliITSdetector &det=layer.GetDetector(idet); |
4ab260d6 | 603 | ResetTrackToFollow(fTracks[fI]); |
604 | if (!fTrackToFollow.Propagate(det.GetPhi(),det.GetR())) { | |
8676d691 | 605 | //Warning("TakeNextProlongation","propagation failed !\n"); |
006b5f7f | 606 | continue; |
607 | } | |
4ab260d6 | 608 | fTrackToFollow.SetDetectorIndex(idet); |
609 | if (TMath::Abs(fTrackToFollow.GetZ()-GetZ())>layer.GetR()+dz) continue; | |
006b5f7f | 610 | } |
611 | ||
4ab260d6 | 612 | if (TMath::Abs(fTrackToFollow.GetZ() - c->GetZ()) > dz) continue; |
613 | if (TMath::Abs(fTrackToFollow.GetY() - c->GetY()) > dy) continue; | |
006b5f7f | 614 | |
c219fd63 | 615 | Double_t ch2=fTrackToFollow.GetPredictedChi2(c); |
616 | if (ch2 > chi2) continue; | |
617 | chi2=ch2; | |
618 | cc=c; cci=ci; | |
619 | break; | |
006b5f7f | 620 | } |
621 | ||
c219fd63 | 622 | if (!cc) return 0; |
006b5f7f | 623 | |
1f3e997f | 624 | {// Take into account the mis-alignment |
625 | Double_t x = fTrackToFollow.GetX() + cc->GetX(); | |
626 | if (!fTrackToFollow.PropagateTo(x,0.,0.)) return 0; | |
627 | } | |
c219fd63 | 628 | if (!fTrackToFollow.Update(cc,chi2,(fI<<28)+cci)) { |
8676d691 | 629 | //Warning("TakeNextProlongation","filtering failed !\n"); |
006b5f7f | 630 | return 0; |
631 | } | |
15dd636f | 632 | |
4ab260d6 | 633 | if (fTrackToFollow.GetNumberOfClusters()>1) |
6c94f330 | 634 | if (TMath::Abs(fTrackToFollow.GetD(GetX(),GetY()))>4) return 0; |
4ab260d6 | 635 | |
a9a2d814 | 636 | fTrackToFollow. |
09cf9d66 | 637 | SetSampledEdx(cc->GetQ(),fI-2); //b.b. |
a9a2d814 | 638 | |
639 | { | |
880f41b9 | 640 | Double_t x0; |
61ab8ea8 | 641 | Double_t d=layer.GetThickness(fTrackToFollow.GetY(),fTrackToFollow.GetZ(),x0); |
880f41b9 | 642 | fTrackToFollow.CorrectForMaterial(d,x0); |
a9a2d814 | 643 | } |
4ab260d6 | 644 | |
a9a2d814 | 645 | if (fConstraint[fPass]) { |
4ab260d6 | 646 | Double_t d=GetEffectiveThickness(0,0); //Think of this !!!! |
8676d691 | 647 | Double_t xyz[]={GetX(),GetY(),GetZ()}; |
648 | Double_t ers[]={GetSigmaX(),GetSigmaY(),GetSigmaZ()}; | |
649 | fTrackToFollow.Improve(d,xyz,ers); | |
a9a2d814 | 650 | } |
006b5f7f | 651 | |
006b5f7f | 652 | return 1; |
653 | } | |
654 | ||
655 | ||
6c94f330 | 656 | AliITStrackerV2::AliITSlayer::AliITSlayer(): |
657 | fR(0.), | |
658 | fPhiOffset(0.), | |
659 | fNladders(0), | |
660 | fZOffset(0.), | |
661 | fNdetectors(0), | |
662 | fDetectors(0), | |
663 | fNsel(0), | |
664 | fRoad(2*fR*TMath::Sqrt(3.14/1.)) //assuming that there's only one cluster | |
665 | { | |
006b5f7f | 666 | //-------------------------------------------------------------------- |
667 | //default AliITSlayer constructor | |
668 | //-------------------------------------------------------------------- | |
c219fd63 | 669 | |
670 | for (Int_t i=0; i<kNsector; i++) fN[i]=0; | |
c219fd63 | 671 | |
006b5f7f | 672 | } |
673 | ||
674 | AliITStrackerV2::AliITSlayer:: | |
6c94f330 | 675 | AliITSlayer(Double_t r,Double_t p,Double_t z,Int_t nl,Int_t nd): |
676 | fR(r), | |
677 | fPhiOffset(p), | |
678 | fNladders(nl), | |
679 | fZOffset(z), | |
680 | fNdetectors(nd), | |
681 | fDetectors(new AliITSdetector[nl*nd]), | |
682 | fNsel(0), | |
683 | fRoad(2*r*TMath::Sqrt(3.14/1.)) //assuming that there's only one cluster | |
684 | { | |
006b5f7f | 685 | //-------------------------------------------------------------------- |
686 | //main AliITSlayer constructor | |
687 | //-------------------------------------------------------------------- | |
006b5f7f | 688 | |
c219fd63 | 689 | for (Int_t i=0; i<kNsector; i++) fN[i]=0; |
c219fd63 | 690 | |
e50912db | 691 | for (Int_t i=0; i<AliITSRecoParam::fgkMaxClusterPerLayer; i++) fClusters[i]=0; |
b87bd7cd | 692 | |
006b5f7f | 693 | } |
694 | ||
695 | AliITStrackerV2::AliITSlayer::~AliITSlayer() { | |
696 | //-------------------------------------------------------------------- | |
697 | // AliITSlayer destructor | |
698 | //-------------------------------------------------------------------- | |
699 | delete[] fDetectors; | |
c219fd63 | 700 | ResetClusters(); |
006b5f7f | 701 | } |
702 | ||
61ab8ea8 | 703 | void AliITStrackerV2::AliITSlayer::ResetClusters() { |
704 | //-------------------------------------------------------------------- | |
705 | // This function removes loaded clusters | |
706 | //-------------------------------------------------------------------- | |
c219fd63 | 707 | for (Int_t s=0; s<kNsector; s++) { |
708 | Int_t &n=fN[s]; | |
709 | while (n) { | |
710 | n--; | |
711 | delete fClusters[s*kMaxClusterPerSector+n]; | |
712 | } | |
713 | } | |
61ab8ea8 | 714 | } |
715 | ||
b87bd7cd | 716 | void AliITStrackerV2::AliITSlayer::ResetRoad() { |
717 | //-------------------------------------------------------------------- | |
718 | // This function calculates the road defined by the cluster density | |
719 | //-------------------------------------------------------------------- | |
720 | Int_t n=0; | |
c219fd63 | 721 | for (Int_t s=0; s<kNsector; s++) { |
722 | Int_t i=fN[s]; | |
723 | while (i--) | |
724 | if (TMath::Abs(fClusters[s*kMaxClusterPerSector+i]->GetZ())<fR) n++; | |
b87bd7cd | 725 | } |
726 | if (n>1) fRoad=2*fR*TMath::Sqrt(3.14/n); | |
727 | } | |
728 | ||
00a7cc50 | 729 | Int_t AliITStrackerV2::AliITSlayer::InsertCluster(AliITSRecPoint *c) { |
006b5f7f | 730 | //-------------------------------------------------------------------- |
c219fd63 | 731 | // This function inserts a cluster to this layer in increasing |
732 | // order of the cluster's fZ | |
006b5f7f | 733 | //-------------------------------------------------------------------- |
c219fd63 | 734 | Float_t circ=TMath::TwoPi()*fR; |
735 | Int_t sec=Int_t(kNsector*c->GetPhiR()/circ); | |
81e97e0d | 736 | if (sec>=kNsector) { |
737 | ::Error("InsertCluster","Wrong sector !\n"); | |
738 | return 1; | |
739 | } | |
c219fd63 | 740 | Int_t &n=fN[sec]; |
741 | if (n>=kMaxClusterPerSector) { | |
742 | ::Error("InsertCluster","Too many clusters !\n"); | |
743 | return 1; | |
006b5f7f | 744 | } |
c219fd63 | 745 | if (n==0) fClusters[sec*kMaxClusterPerSector]=c; |
746 | else { | |
747 | Int_t i=FindClusterIndex(c->GetZ(),sec); | |
748 | Int_t k=n-i+sec*kMaxClusterPerSector; | |
00a7cc50 | 749 | memmove(fClusters+i+1 ,fClusters+i,k*sizeof(AliITSRecPoint*)); |
c219fd63 | 750 | fClusters[i]=c; |
751 | } | |
752 | n++; | |
006b5f7f | 753 | return 0; |
754 | } | |
755 | ||
c219fd63 | 756 | Int_t |
757 | AliITStrackerV2::AliITSlayer::FindClusterIndex(Float_t z,Int_t s) const { | |
006b5f7f | 758 | //-------------------------------------------------------------------- |
c219fd63 | 759 | // For the sector "s", this function returns the index of the first |
760 | // with its fZ >= "z". | |
006b5f7f | 761 | //-------------------------------------------------------------------- |
c219fd63 | 762 | Int_t nc=fN[s]; |
763 | if (nc==0) return kMaxClusterPerSector*s; | |
764 | ||
765 | Int_t b=kMaxClusterPerSector*s; | |
766 | if (z <= fClusters[b]->GetZ()) return b; | |
767 | ||
768 | Int_t e=b+nc-1; | |
769 | if (z > fClusters[e]->GetZ()) return e+1; | |
770 | ||
771 | Int_t m=(b+e)/2; | |
006b5f7f | 772 | for (; b<e; m=(b+e)/2) { |
773 | if (z > fClusters[m]->GetZ()) b=m+1; | |
774 | else e=m; | |
775 | } | |
776 | return m; | |
777 | } | |
778 | ||
c219fd63 | 779 | Int_t AliITStrackerV2::AliITSlayer:: |
780 | SelectClusters(Float_t zmin,Float_t zmax,Float_t ymin, Float_t ymax) { | |
006b5f7f | 781 | //-------------------------------------------------------------------- |
c219fd63 | 782 | // This function selects clusters within the "window" |
006b5f7f | 783 | //-------------------------------------------------------------------- |
c219fd63 | 784 | Float_t circ=fR*TMath::TwoPi(); |
785 | ||
786 | if (ymin>circ) ymin-=circ; else if (ymin<0) ymin+=circ; | |
787 | if (ymax>circ) ymax-=circ; else if (ymax<0) ymax+=circ; | |
788 | ||
521f4796 | 789 | Int_t i1=Int_t(kNsector*ymin/circ); if (i1==kNsector) i1--; |
c219fd63 | 790 | if (fN[i1]!=0) { |
791 | Float_t ym = (ymax<ymin) ? ymax+circ : ymax; | |
792 | Int_t i=FindClusterIndex(zmin,i1), imax=i1*kMaxClusterPerSector+fN[i1]; | |
793 | for (; i<imax; i++) { | |
00a7cc50 | 794 | AliITSRecPoint *c=fClusters[i]; |
c219fd63 | 795 | if (c->IsUsed()) continue; |
796 | if (c->GetZ()>zmax) break; | |
797 | if (c->GetPhiR()<=ymin) continue; | |
798 | if (c->GetPhiR()>ym) continue; | |
799 | fIndex[fNsel++]=i; | |
800 | } | |
801 | } | |
802 | ||
521f4796 | 803 | Int_t i2=Int_t(kNsector*ymax/circ); if (i2==kNsector) i2--; |
c219fd63 | 804 | if (i2==i1) return fNsel; |
805 | ||
806 | if (fN[i2]!=0) { | |
807 | Float_t ym = (ymin>ymax) ? ymin-circ : ymin; | |
808 | Int_t i=FindClusterIndex(zmin,i2), imax=i2*kMaxClusterPerSector+fN[i2]; | |
809 | for (; i<imax; i++) { | |
00a7cc50 | 810 | AliITSRecPoint *c=fClusters[i]; |
c219fd63 | 811 | if (c->IsUsed()) continue; |
812 | if (c->GetZ()>zmax) break; | |
813 | if (c->GetPhiR()<=ym) continue; | |
814 | if (c->GetPhiR()>ymax) continue; | |
815 | fIndex[fNsel++]=i; | |
816 | } | |
817 | } | |
818 | ||
819 | return fNsel; | |
006b5f7f | 820 | } |
821 | ||
00a7cc50 | 822 | const AliITSRecPoint *AliITStrackerV2::AliITSlayer::GetNextCluster(Int_t &ci){ |
006b5f7f | 823 | //-------------------------------------------------------------------- |
824 | // This function returns clusters within the "window" | |
825 | //-------------------------------------------------------------------- | |
00a7cc50 | 826 | AliITSRecPoint *c=0; |
c219fd63 | 827 | ci=-1; |
828 | if (fNsel) { | |
829 | fNsel--; | |
830 | ci=fIndex[fNsel]; | |
831 | c=fClusters[ci]; | |
006b5f7f | 832 | } |
c219fd63 | 833 | return c; |
834 | } | |
7f6ddf58 | 835 | |
c219fd63 | 836 | Int_t AliITStrackerV2::AliITSlayer::GetNumberOfClusters() const { |
837 | Int_t n=0; | |
838 | for (Int_t s=0; s<kNsector; s++) n+=fN[s]; | |
839 | return n; | |
006b5f7f | 840 | } |
841 | ||
c219fd63 | 842 | Int_t |
843 | AliITStrackerV2::AliITSlayer::FindDetectorIndex(Double_t phi,Double_t z)const { | |
006b5f7f | 844 | //-------------------------------------------------------------------- |
845 | //This function finds the detector crossed by the track | |
846 | //-------------------------------------------------------------------- | |
31fb8575 | 847 | Double_t dphi; |
848 | if (fZOffset<0) // old geometry | |
849 | dphi = -(phi-fPhiOffset); | |
850 | else // new geometry | |
851 | dphi = phi-fPhiOffset; | |
852 | ||
006b5f7f | 853 | if (dphi < 0) dphi += 2*TMath::Pi(); |
854 | else if (dphi >= 2*TMath::Pi()) dphi -= 2*TMath::Pi(); | |
855 | Int_t np=Int_t(dphi*fNladders*0.5/TMath::Pi()+0.5); | |
3e3e8427 | 856 | if (np>=fNladders) np-=fNladders; |
857 | if (np<0) np+=fNladders; | |
006b5f7f | 858 | |
859 | Double_t dz=fZOffset-z; | |
860 | Int_t nz=Int_t(dz*(fNdetectors-1)*0.5/fZOffset+0.5); | |
3e3e8427 | 861 | if (nz>=fNdetectors) return -1; |
862 | if (nz<0) return -1; | |
006b5f7f | 863 | |
006b5f7f | 864 | return np*fNdetectors + nz; |
865 | } | |
866 | ||
867 | Double_t | |
61ab8ea8 | 868 | AliITStrackerV2::AliITSlayer::GetThickness(Double_t y,Double_t z,Double_t &x0) |
869 | const { | |
a9a2d814 | 870 | //-------------------------------------------------------------------- |
871 | //This function returns the layer thickness at this point (units X0) | |
872 | //-------------------------------------------------------------------- | |
873 | Double_t d=0.0085; | |
61ab8ea8 | 874 | x0=21.82; |
a9a2d814 | 875 | |
876 | if (43<fR&&fR<45) { //SSD2 | |
61ab8ea8 | 877 | Double_t dd=0.0034; |
878 | d=dd; | |
879 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
880 | if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);} | |
881 | if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);} | |
a9a2d814 | 882 | for (Int_t i=0; i<12; i++) { |
61ab8ea8 | 883 | if (TMath::Abs(z-3.9*(i+0.5))<0.15) { |
884 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
885 | d+=0.0034; | |
886 | break; | |
887 | } | |
888 | if (TMath::Abs(z+3.9*(i+0.5))<0.15) { | |
889 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
890 | d+=0.0034; | |
891 | break; | |
892 | } | |
893 | if (TMath::Abs(z-3.4-3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
894 | if (TMath::Abs(z+0.5+3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
a9a2d814 | 895 | } |
896 | } else | |
897 | if (37<fR&&fR<41) { //SSD1 | |
61ab8ea8 | 898 | Double_t dd=0.0034; |
899 | d=dd; | |
900 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
901 | if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);} | |
902 | if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);} | |
a9a2d814 | 903 | for (Int_t i=0; i<11; i++) { |
61ab8ea8 | 904 | if (TMath::Abs(z-3.9*i)<0.15) { |
905 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
906 | d+=dd; | |
907 | break; | |
908 | } | |
909 | if (TMath::Abs(z+3.9*i)<0.15) { | |
910 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
911 | d+=dd; | |
912 | break; | |
913 | } | |
914 | if (TMath::Abs(z-1.85-3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
915 | if (TMath::Abs(z+2.05+3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
a9a2d814 | 916 | } |
917 | } else | |
918 | if (13<fR&&fR<26) { //SDD | |
61ab8ea8 | 919 | Double_t dd=0.0033; |
920 | d=dd; | |
921 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
922 | ||
923 | if (TMath::Abs(y-1.80)<0.55) { | |
924 | d+=0.016; | |
925 | for (Int_t j=0; j<20; j++) { | |
926 | if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
927 | if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
928 | } | |
929 | } | |
930 | if (TMath::Abs(y+1.80)<0.55) { | |
931 | d+=0.016; | |
932 | for (Int_t j=0; j<20; j++) { | |
933 | if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
934 | if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
935 | } | |
936 | } | |
937 | ||
938 | for (Int_t i=0; i<4; i++) { | |
939 | if (TMath::Abs(z-7.3*i)<0.60) { | |
940 | d+=dd; | |
941 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
942 | break; | |
943 | } | |
944 | if (TMath::Abs(z+7.3*i)<0.60) { | |
945 | d+=dd; | |
946 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
947 | break; | |
948 | } | |
a9a2d814 | 949 | } |
950 | } else | |
951 | if (6<fR&&fR<8) { //SPD2 | |
61ab8ea8 | 952 | Double_t dd=0.0063; x0=21.5; |
953 | d=dd; | |
954 | if (TMath::Abs(y-3.08)>0.5) d+=dd; | |
955 | //if (TMath::Abs(y-3.08)>0.45) d+=dd; | |
956 | if (TMath::Abs(y-3.03)<0.10) {d+=0.014;} | |
a9a2d814 | 957 | } else |
958 | if (3<fR&&fR<5) { //SPD1 | |
61ab8ea8 | 959 | Double_t dd=0.0063; x0=21.5; |
960 | d=dd; | |
961 | if (TMath::Abs(y+0.21)>0.6) d+=dd; | |
962 | //if (TMath::Abs(y+0.21)>0.45) d+=dd; | |
963 | if (TMath::Abs(y+0.10)<0.10) {d+=0.014;} | |
a9a2d814 | 964 | } |
965 | ||
a9a2d814 | 966 | return d; |
967 | } | |
006b5f7f | 968 | |
a9a2d814 | 969 | Double_t AliITStrackerV2::GetEffectiveThickness(Double_t y,Double_t z) const |
006b5f7f | 970 | { |
971 | //-------------------------------------------------------------------- | |
a9a2d814 | 972 | //Returns the thickness between the current layer and the vertex (units X0) |
006b5f7f | 973 | //-------------------------------------------------------------------- |
61ab8ea8 | 974 | Double_t d=0.0028*3*3; //beam pipe |
975 | Double_t x0=0; | |
006b5f7f | 976 | |
18856a77 | 977 | Double_t xn=fgLayers[fI].GetR(); |
006b5f7f | 978 | for (Int_t i=0; i<fI; i++) { |
18856a77 | 979 | Double_t xi=fgLayers[i].GetR(); |
980 | d+=fgLayers[i].GetThickness(y,z,x0)*xi*xi; | |
006b5f7f | 981 | } |
982 | ||
983 | if (fI>1) { | |
61ab8ea8 | 984 | Double_t xi=9.; |
985 | d+=0.0097*xi*xi; | |
006b5f7f | 986 | } |
987 | ||
988 | if (fI>3) { | |
18856a77 | 989 | Double_t xi=0.5*(fgLayers[3].GetR()+fgLayers[4].GetR()); |
61ab8ea8 | 990 | d+=0.0034*xi*xi; |
006b5f7f | 991 | } |
61ab8ea8 | 992 | |
006b5f7f | 993 | return d/(xn*xn); |
994 | } | |
995 | ||
ef7253ac | 996 | Bool_t AliITStrackerV2::RefitAt(Double_t xx,AliITStrackV2 *t, |
997 | const AliITStrackV2 *c, Bool_t extra) { | |
4ab260d6 | 998 | //-------------------------------------------------------------------- |
c630aafd | 999 | // This function refits the track "t" at the position "x" using |
1000 | // the clusters from "c" | |
ef7253ac | 1001 | // If "extra"==kTRUE, |
1002 | // the clusters from overlapped modules get attached to "t" | |
4ab260d6 | 1003 | //-------------------------------------------------------------------- |
e50912db | 1004 | Int_t index[AliITSgeomTGeo::kNLayers]; |
880f41b9 | 1005 | Int_t k; |
e50912db | 1006 | for (k=0; k<AliITSgeomTGeo::GetNLayers(); k++) index[k]=-1; |
c630aafd | 1007 | Int_t nc=c->GetNumberOfClusters(); |
880f41b9 | 1008 | for (k=0; k<nc; k++) { |
c630aafd | 1009 | Int_t idx=c->GetClusterIndex(k),nl=(idx&0xf0000000)>>28; |
880f41b9 | 1010 | index[nl]=idx; |
1011 | } | |
880f41b9 | 1012 | |
4ab260d6 | 1013 | Int_t from, to, step; |
ee34184f | 1014 | if (xx > t->GetX()) { |
e50912db | 1015 | from=0; to=AliITSgeomTGeo::GetNLayers(); |
4ab260d6 | 1016 | step=+1; |
1017 | } else { | |
e50912db | 1018 | from=AliITSgeomTGeo::GetNLayers()-1; to=-1; |
4ab260d6 | 1019 | step=-1; |
1020 | } | |
1021 | ||
1022 | for (Int_t i=from; i != to; i += step) { | |
18856a77 | 1023 | AliITSlayer &layer=fgLayers[i]; |
4ab260d6 | 1024 | Double_t r=layer.GetR(); |
1025 | ||
1026 | { | |
1027 | Double_t hI=i-0.5*step; | |
880f41b9 | 1028 | if (TMath::Abs(hI-1.5)<0.01 || TMath::Abs(hI-3.5)<0.01) { |
18856a77 | 1029 | Double_t rs=0.5*(fgLayers[i-step].GetR() + r); |
61ab8ea8 | 1030 | Double_t d=0.0034, x0=38.6; |
880f41b9 | 1031 | if (TMath::Abs(hI-1.5)<0.01) {rs=9.; d=0.0097; x0=42;} |
1032 | if (!t->PropagateTo(rs,-step*d,x0)) { | |
4ab260d6 | 1033 | return kFALSE; |
1034 | } | |
1035 | } | |
1036 | } | |
1037 | ||
880f41b9 | 1038 | // remember old position [SR, GSI 18.02.2003] |
1039 | Double_t oldX=0., oldY=0., oldZ=0.; | |
1040 | if (t->IsStartedTimeIntegral() && step==1) { | |
1041 | t->GetGlobalXYZat(t->GetX(),oldX,oldY,oldZ); | |
1042 | } | |
1043 | // | |
1044 | ||
8602c008 | 1045 | Double_t phi,z; |
1046 | if (!t->GetPhiZat(r,phi,z)) { | |
4ab260d6 | 1047 | return kFALSE; |
1048 | } | |
8602c008 | 1049 | |
4ab260d6 | 1050 | Int_t idet=layer.FindDetectorIndex(phi,z); |
1051 | if (idet<0) { | |
1052 | return kFALSE; | |
1053 | } | |
1054 | const AliITSdetector &det=layer.GetDetector(idet); | |
1055 | phi=det.GetPhi(); | |
1056 | if (!t->Propagate(phi,det.GetR())) { | |
1057 | return kFALSE; | |
1058 | } | |
1059 | t->SetDetectorIndex(idet); | |
1060 | ||
00a7cc50 | 1061 | const AliITSRecPoint *cl=0; |
44347160 | 1062 | Double_t maxchi2=AliITSReconstructor::GetRecoParam()->GetMaxChi2(); |
4ab260d6 | 1063 | |
1064 | Int_t idx=index[i]; | |
c0342e67 | 1065 | if (idx>=0) { |
a5d0fae6 | 1066 | const AliITSRecPoint *ccc=(AliITSRecPoint *)GetCluster(idx); |
1067 | if (idet != ccc->GetDetectorIndex()) { | |
1068 | idet=ccc->GetDetectorIndex(); | |
1069 | const AliITSdetector &det2=layer.GetDetector(idet); | |
1070 | if (!t->Propagate(det2.GetPhi(),det2.GetR())) { | |
4ab260d6 | 1071 | return kFALSE; |
1072 | } | |
1073 | t->SetDetectorIndex(idet); | |
1074 | } | |
a5d0fae6 | 1075 | Double_t chi2=t->GetPredictedChi2(ccc); |
c630aafd | 1076 | if (chi2<maxchi2) { |
a5d0fae6 | 1077 | cl=ccc; |
c630aafd | 1078 | maxchi2=chi2; |
1079 | } else { | |
1080 | return kFALSE; | |
1081 | } | |
4ab260d6 | 1082 | } |
ef7253ac | 1083 | |
4ab260d6 | 1084 | if (cl) { |
1f3e997f | 1085 | // Take into account the mis-alignment |
1086 | Double_t x=t->GetX()+cl->GetX(); | |
1087 | if (!t->PropagateTo(x,0.,0.)) return kFALSE; | |
4ab260d6 | 1088 | if (!t->Update(cl,maxchi2,idx)) { |
1089 | return kFALSE; | |
1090 | } | |
09cf9d66 | 1091 | t->SetSampledEdx(cl->GetQ(),i-2); |
4ab260d6 | 1092 | } |
1093 | ||
1094 | { | |
61ab8ea8 | 1095 | Double_t x0; |
1096 | Double_t d=layer.GetThickness(t->GetY(),t->GetZ(),x0); | |
1097 | t->CorrectForMaterial(-step*d,x0); | |
4ab260d6 | 1098 | } |
880f41b9 | 1099 | |
ef7253ac | 1100 | if (extra) { //search for extra clusters |
1101 | AliITStrackV2 tmp(*t); | |
44347160 | 1102 | Double_t dz=4*TMath::Sqrt(tmp.GetSigmaZ2()+AliITSReconstructor::GetRecoParam()->GetSigmaZ2(i)); |
ef7253ac | 1103 | if (dz < 0.5*TMath::Abs(tmp.GetTgl())) dz=0.5*TMath::Abs(tmp.GetTgl()); |
44347160 | 1104 | Double_t dy=4*TMath::Sqrt(t->GetSigmaY2()+AliITSReconstructor::GetRecoParam()->GetSigmaY2(i)); |
ef7253ac | 1105 | if (dy < 0.5*TMath::Abs(tmp.GetSnp())) dy=0.5*TMath::Abs(tmp.GetSnp()); |
1106 | Double_t zmin=t->GetZ() - dz; | |
1107 | Double_t zmax=t->GetZ() + dz; | |
1108 | Double_t ymin=t->GetY() + phi*r - dy; | |
1109 | Double_t ymax=t->GetY() + phi*r + dy; | |
1110 | layer.SelectClusters(zmin,zmax,ymin,ymax); | |
1111 | ||
a5d0fae6 | 1112 | const AliITSRecPoint *cx=0; Int_t ci=-1,cci=-1; |
1113 | maxchi2=1000.*AliITSReconstructor::GetRecoParam()->GetMaxChi2(); | |
1114 | Double_t tolerance=0.1; | |
1115 | while ((cx=layer.GetNextCluster(ci))!=0) { | |
1116 | if (idet == cx->GetDetectorIndex()) continue; | |
ef7253ac | 1117 | |
a5d0fae6 | 1118 | const AliITSdetector &detx=layer.GetDetector(cx->GetDetectorIndex()); |
ef7253ac | 1119 | |
a5d0fae6 | 1120 | if (!tmp.Propagate(detx.GetPhi(),detx.GetR())) continue; |
ef7253ac | 1121 | |
a5d0fae6 | 1122 | if (TMath::Abs(tmp.GetZ() - cx->GetZ()) > tolerance) continue; |
1123 | if (TMath::Abs(tmp.GetY() - cx->GetY()) > tolerance) continue; | |
ef7253ac | 1124 | |
a5d0fae6 | 1125 | Double_t chi2=tmp.GetPredictedChi2(cx); |
ef7253ac | 1126 | if (chi2<maxchi2) { maxchi2=chi2; cci=ci; } |
1127 | } | |
1128 | if (cci>=0) t->SetExtraCluster(i,(i<<28)+cci); | |
1129 | } | |
1130 | ||
880f41b9 | 1131 | // track time update [SR, GSI 17.02.2003] |
1132 | if (t->IsStartedTimeIntegral() && step==1) { | |
1133 | Double_t newX, newY, newZ; | |
1134 | t->GetGlobalXYZat(t->GetX(),newX,newY,newZ); | |
1135 | Double_t dL2 = (oldX-newX)*(oldX-newX) + (oldY-newY)*(oldY-newY) + | |
1136 | (oldZ-newZ)*(oldZ-newZ); | |
1137 | t->AddTimeStep(TMath::Sqrt(dL2)); | |
1138 | } | |
1139 | // | |
4ab260d6 | 1140 | |
1141 | } | |
1142 | ||
ee34184f | 1143 | if (!t->PropagateTo(xx,0.,0.)) return kFALSE; |
4ab260d6 | 1144 | return kTRUE; |
1145 | } | |
1146 | ||
b87bd7cd | 1147 | void AliITStrackerV2::UseClusters(const AliKalmanTrack *t, Int_t from) const { |
1148 | //-------------------------------------------------------------------- | |
1149 | // This function marks clusters assigned to the track | |
1150 | //-------------------------------------------------------------------- | |
1151 | AliTracker::UseClusters(t,from); | |
880f41b9 | 1152 | |
5482d29d | 1153 | Int_t clusterIndex = t->GetClusterIndex(0); |
1154 | AliITSRecPoint *c= 0x0; | |
1155 | ||
1156 | if (clusterIndex>-1) | |
1157 | c = (AliITSRecPoint *)GetCluster(clusterIndex); | |
d920bdee | 1158 | if (c && c->GetSigmaZ2()>0.1) c->UnUse(); |
5482d29d | 1159 | |
1160 | c = 0x0; | |
1161 | clusterIndex = t->GetClusterIndex(1); | |
1162 | if (clusterIndex>-1) | |
1163 | c=(AliITSRecPoint *)GetCluster(clusterIndex); | |
d920bdee | 1164 | if (c && c->GetSigmaZ2()>0.1) c->UnUse(); |
880f41b9 | 1165 | |
b87bd7cd | 1166 | } |