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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 | |
18 | // | |
19 | // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch | |
a9a2d814 | 20 | // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch |
006b5f7f | 21 | //------------------------------------------------------------------------- |
22 | #include <TFile.h> | |
23 | #include <TTree.h> | |
24 | #include <TRandom.h> | |
4ae5bbc4 | 25 | #include <Riostream.h> |
006b5f7f | 26 | |
27 | #include "AliITSgeom.h" | |
28 | #include "AliITSRecPoint.h" | |
517b130f | 29 | #include "AliTPCtrack.h" |
006b5f7f | 30 | #include "AliITSclusterV2.h" |
31 | #include "AliITStrackerV2.h" | |
32 | ||
33 | //#define DEBUG | |
34 | ||
35 | #ifdef DEBUG | |
61ab8ea8 | 36 | Int_t LAB=113; |
006b5f7f | 37 | #endif |
38 | ||
006b5f7f | 39 | AliITStrackerV2::AliITSlayer AliITStrackerV2::fLayers[kMaxLayer]; // ITS layers |
40 | ||
61ab8ea8 | 41 | AliITStrackerV2::AliITStrackerV2(const AliITSgeom *geom) : AliTracker() { |
006b5f7f | 42 | //-------------------------------------------------------------------- |
61ab8ea8 | 43 | //This is the AliITStrackerV2 constructor |
006b5f7f | 44 | //-------------------------------------------------------------------- |
006b5f7f | 45 | AliITSgeom *g=(AliITSgeom*)geom; |
46 | ||
47 | Float_t x,y,z; | |
48 | Int_t i; | |
49 | for (i=1; i<kMaxLayer+1; i++) { | |
50 | Int_t nlad=g->GetNladders(i); | |
51 | Int_t ndet=g->GetNdetectors(i); | |
52 | ||
53 | g->GetTrans(i,1,1,x,y,z); | |
54 | Double_t r=TMath::Sqrt(x*x + y*y); | |
55 | Double_t poff=TMath::ATan2(y,x); | |
56 | Double_t zoff=z; | |
57 | ||
58 | g->GetTrans(i,1,2,x,y,z); | |
59 | r += TMath::Sqrt(x*x + y*y); | |
60 | g->GetTrans(i,2,1,x,y,z); | |
61 | r += TMath::Sqrt(x*x + y*y); | |
62 | g->GetTrans(i,2,2,x,y,z); | |
63 | r += TMath::Sqrt(x*x + y*y); | |
64 | r*=0.25; | |
65 | ||
66 | new (fLayers+i-1) AliITSlayer(r,poff,zoff,nlad,ndet); | |
67 | ||
68 | for (Int_t j=1; j<nlad+1; j++) { | |
69 | for (Int_t k=1; k<ndet+1; k++) { //Fill this layer with detectors | |
70 | Float_t x,y,zshift; g->GetTrans(i,j,k,x,y,zshift); | |
71 | Double_t rot[9]; g->GetRotMatrix(i,j,k,rot); | |
72 | ||
73 | Double_t r =-x*rot[1] + y*rot[0]; if (i==1) r=-r; | |
74 | Double_t phi=TMath::ATan2(rot[1],rot[0]); if (i==1) phi-=3.1415927; | |
61ab8ea8 | 75 | phi+=0.5*TMath::Pi(); if (phi<0) phi += 2*TMath::Pi(); |
006b5f7f | 76 | AliITSdetector &det=fLayers[i-1].GetDetector((j-1)*ndet + k-1); |
77 | ||
006b5f7f | 78 | new(&det) AliITSdetector(r,phi); |
79 | } | |
80 | } | |
81 | ||
82 | } | |
83 | ||
61ab8ea8 | 84 | fI=kMaxLayer; |
743a19f2 | 85 | |
61ab8ea8 | 86 | fPass=0; |
87 | fConstraint[0]=1; fConstraint[1]=0; | |
88 | } | |
006b5f7f | 89 | |
61ab8ea8 | 90 | void AliITStrackerV2::LoadClusters() { |
91 | //-------------------------------------------------------------------- | |
92 | //This function loads ITS clusters | |
93 | //-------------------------------------------------------------------- | |
94 | char cname[100]; | |
95 | sprintf(cname,"TreeC_ITS_%d",GetEventNumber()); | |
96 | TTree *cTree=(TTree*)gDirectory->Get(cname); | |
97 | if (!cTree) { | |
98 | cerr<<"AliITStrackerV2::LoadClusters can't get cTree !\n"; | |
99 | exit(1); | |
100 | } | |
101 | TBranch *branch=cTree->GetBranch("Clusters"); | |
102 | if (!branch) { | |
103 | cerr<<"AliITStrackerV2::LoadClusters can't get Clusters branch !\n"; | |
104 | exit(1); | |
105 | } | |
006b5f7f | 106 | |
61ab8ea8 | 107 | TClonesArray dummy("AliITSclusterV2",10000), *clusters=&dummy; |
108 | branch->SetAddress(&clusters); | |
006b5f7f | 109 | |
61ab8ea8 | 110 | Int_t j=0; |
111 | for (Int_t i=0; i<kMaxLayer; i++) { | |
112 | Int_t jmax = j + fLayers[i].GetNladders()*fLayers[i].GetNdetectors(); | |
113 | for (; j<jmax; j++) { | |
114 | if (!cTree->GetEvent(j)) continue; | |
115 | Int_t ncl=clusters->GetEntriesFast(); | |
116 | while (ncl--) { | |
117 | AliITSclusterV2 *c=(AliITSclusterV2*)clusters->UncheckedAt(ncl); | |
006b5f7f | 118 | |
119 | #ifdef DEBUG | |
120 | if (c->GetLabel(2)!=LAB) | |
121 | if (c->GetLabel(1)!=LAB) | |
122 | if (c->GetLabel(0)!=LAB) continue; | |
123 | cout<<lay-1<<' '<<lad-1<<' '<<det-1<<' '<<c->GetY()<<' '<<c->GetZ()<<endl; | |
124 | #endif | |
125 | ||
61ab8ea8 | 126 | fLayers[i].InsertCluster(new AliITSclusterV2(*c)); |
127 | } | |
128 | clusters->Delete(); | |
129 | } | |
006b5f7f | 130 | } |
61ab8ea8 | 131 | delete cTree; //Thanks to Mariana Bondila |
132 | } | |
006b5f7f | 133 | |
61ab8ea8 | 134 | void AliITStrackerV2::UnloadClusters() { |
135 | //-------------------------------------------------------------------- | |
136 | //This function unloads ITS clusters | |
137 | //-------------------------------------------------------------------- | |
138 | for (Int_t i=0; i<kMaxLayer; i++) fLayers[i].ResetClusters(); | |
006b5f7f | 139 | } |
140 | ||
4ab260d6 | 141 | //#ifdef DEBUG |
006b5f7f | 142 | static Int_t lbl; |
4ab260d6 | 143 | //#endif |
006b5f7f | 144 | |
145 | Int_t AliITStrackerV2::Clusters2Tracks(const TFile *inp, TFile *out) { | |
146 | //-------------------------------------------------------------------- | |
147 | //This functions reconstructs ITS tracks | |
148 | //-------------------------------------------------------------------- | |
149 | TFile *in=(TFile*)inp; | |
150 | TDirectory *savedir=gDirectory; | |
151 | ||
61ab8ea8 | 152 | LoadClusters(); |
153 | ||
006b5f7f | 154 | if (!in->IsOpen()) { |
155 | cerr<<"AliITStrackerV2::Clusters2Tracks(): "; | |
156 | cerr<<"file with TPC tracks is not open !\n"; | |
157 | return 1; | |
158 | } | |
159 | ||
160 | if (!out->IsOpen()) { | |
161 | cerr<<"AliITStrackerV2::Clusters2Tracks(): "; | |
162 | cerr<<"file for ITS tracks is not open !\n"; | |
163 | return 2; | |
164 | } | |
165 | ||
7f6ddf58 | 166 | in->cd(); |
167 | ||
61ab8ea8 | 168 | Char_t tname[100]; |
a7554aa9 | 169 | Int_t nentr=0; TObjArray itsTracks(15000); |
7f6ddf58 | 170 | |
171 | {/* Read TPC tracks */ | |
61ab8ea8 | 172 | sprintf(tname,"TreeT_TPC_%d",GetEventNumber()); |
7f6ddf58 | 173 | TTree *tpcTree=(TTree*)in->Get(tname); |
174 | if (!tpcTree) { | |
175 | cerr<<"AliITStrackerV2::Clusters2Tracks(): " | |
176 | "can't get a tree with TPC tracks !\n"; | |
177 | return 3; | |
178 | } | |
179 | AliTPCtrack *itrack=new AliTPCtrack; | |
180 | tpcTree->SetBranchAddress("tracks",&itrack); | |
181 | nentr=(Int_t)tpcTree->GetEntries(); | |
182 | for (Int_t i=0; i<nentr; i++) { | |
183 | tpcTree->GetEvent(i); | |
4ab260d6 | 184 | AliITStrackV2 *t=0; |
185 | try { | |
186 | t=new AliITStrackV2(*itrack); | |
187 | } catch (const Char_t *msg) { | |
188 | cerr<<msg<<endl; | |
189 | delete t; | |
190 | continue; | |
191 | } | |
a9a2d814 | 192 | if (TMath::Abs(t->GetD())>4) continue; |
193 | ||
61ab8ea8 | 194 | t->PropagateTo(80.,0.0053,30); |
195 | if (TMath::Abs(t->GetY())>12.8) t->CorrectForMaterial(0.03); | |
a9a2d814 | 196 | if (TMath::Abs(t->GetZ())<0.2) t->CorrectForMaterial(0.40); |
61ab8ea8 | 197 | t->PropagateTo(61.,0.0053,30); |
198 | //Double_t xk=52.,x,y,z; t->GetGlobalXYZat(xk,x,y,z); | |
199 | //if (TMath::Abs(y)<7.77) t->PropagateTo(xk,0.19,24.); | |
a9a2d814 | 200 | t->PropagateTo(50.,0.001); |
201 | ||
202 | itsTracks.AddLast(t); | |
7f6ddf58 | 203 | } |
204 | delete tpcTree; //Thanks to Mariana Bondila | |
205 | delete itrack; | |
006b5f7f | 206 | } |
7f6ddf58 | 207 | itsTracks.Sort(); |
006b5f7f | 208 | |
209 | out->cd(); | |
7f6ddf58 | 210 | |
61ab8ea8 | 211 | sprintf(tname,"TreeT_ITS_%d",GetEventNumber()); |
7f6ddf58 | 212 | TTree itsTree(tname,"Tree with ITS tracks"); |
006b5f7f | 213 | AliITStrackV2 *otrack=&fBestTrack; |
214 | itsTree.Branch("tracks","AliITStrackV2",&otrack,32000,0); | |
215 | ||
7f6ddf58 | 216 | for (fPass=0; fPass<2; fPass++) { |
217 | Int_t &constraint=fConstraint[fPass]; if (constraint<0) continue; | |
218 | for (Int_t i=0; i<nentr; i++) { | |
219 | if (i%10==0) cerr<<nentr-i<<" \r"; | |
220 | AliITStrackV2 *t=(AliITStrackV2*)itsTracks.UncheckedAt(i); | |
221 | if (t==0) continue; //this track has been already tracked | |
222 | Int_t tpcLabel=t->GetLabel(); //save the TPC track label | |
a9a2d814 | 223 | |
4ab260d6 | 224 | lbl=tpcLabel; |
006b5f7f | 225 | #ifdef DEBUG |
14825d5a | 226 | lbl=tpcLabel; |
006b5f7f | 227 | if (TMath::Abs(tpcLabel)!=LAB) continue; |
228 | cout<<tpcLabel<<" *****************\n"; | |
229 | #endif | |
a9a2d814 | 230 | |
4ab260d6 | 231 | ResetTrackToFollow(*t); |
7f6ddf58 | 232 | ResetBestTrack(); |
006b5f7f | 233 | |
7f6ddf58 | 234 | for (FollowProlongation(); fI<kMaxLayer; fI++) { |
235 | while (TakeNextProlongation()) FollowProlongation(); | |
236 | } | |
006b5f7f | 237 | |
238 | #ifdef DEBUG | |
239 | cout<<fBestTrack.GetNumberOfClusters()<<" number of clusters\n\n"; | |
240 | #endif | |
241 | ||
4ab260d6 | 242 | if (fBestTrack.GetNumberOfClusters() < kMaxLayer-kLayersToSkip) continue; |
243 | ||
244 | if (fConstraint[fPass]) { | |
245 | Int_t index[kMaxLayer]; | |
246 | Int_t k; | |
247 | for (k=0; k<kMaxLayer; k++) index[k]=-1; | |
248 | Int_t nc=fBestTrack.GetNumberOfClusters(); | |
249 | for (k=0; k<nc; k++) { | |
250 | Int_t idx=fBestTrack.GetClusterIndex(k),nl=(idx&0xf0000000)>>28; | |
251 | index[nl]=idx; | |
252 | } | |
253 | fBestTrack.~AliITStrackV2(); new(&fBestTrack) AliITStrackV2(*t); | |
254 | if (!RefitAt(3.7, &fBestTrack, index)) continue; | |
255 | } | |
256 | ||
257 | fBestTrack.SetLabel(tpcLabel); | |
258 | fBestTrack.CookdEdx(); | |
259 | CookLabel(&fBestTrack,0.); //For comparison only | |
260 | itsTree.Fill(); | |
261 | UseClusters(&fBestTrack); | |
262 | delete itsTracks.RemoveAt(i); | |
006b5f7f | 263 | |
7f6ddf58 | 264 | } |
006b5f7f | 265 | } |
006b5f7f | 266 | |
7f6ddf58 | 267 | itsTree.Write(); |
c7ee21ca | 268 | |
7f6ddf58 | 269 | itsTracks.Delete(); |
61ab8ea8 | 270 | |
271 | UnloadClusters(); | |
272 | ||
7f6ddf58 | 273 | savedir->cd(); |
274 | cerr<<"Number of TPC tracks: "<<nentr<<endl; | |
275 | cerr<<"Number of prolonged tracks: "<<itsTree.GetEntries()<<endl; | |
006b5f7f | 276 | |
277 | return 0; | |
278 | } | |
279 | ||
14825d5a | 280 | Int_t AliITStrackerV2::PropagateBack(const TFile *inp, TFile *out) { |
281 | //-------------------------------------------------------------------- | |
282 | //This functions propagates reconstructed ITS tracks back | |
283 | //-------------------------------------------------------------------- | |
284 | TFile *in=(TFile*)inp; | |
285 | TDirectory *savedir=gDirectory; | |
286 | ||
61ab8ea8 | 287 | LoadClusters(); |
288 | ||
14825d5a | 289 | if (!in->IsOpen()) { |
290 | cerr<<"AliITStrackerV2::PropagateBack(): "; | |
291 | cerr<<"file with ITS tracks is not open !\n"; | |
292 | return 1; | |
293 | } | |
294 | ||
295 | if (!out->IsOpen()) { | |
296 | cerr<<"AliITStrackerV2::PropagateBack(): "; | |
297 | cerr<<"file for back propagated ITS tracks is not open !\n"; | |
298 | return 2; | |
299 | } | |
300 | ||
301 | in->cd(); | |
61ab8ea8 | 302 | |
303 | Char_t tname[100]; | |
304 | sprintf(tname,"TreeT_ITS_%d",GetEventNumber()); | |
305 | TTree *itsTree=(TTree*)in->Get(tname); | |
14825d5a | 306 | if (!itsTree) { |
307 | cerr<<"AliITStrackerV2::PropagateBack() "; | |
308 | cerr<<"can't get a tree with ITS tracks !\n"; | |
309 | return 3; | |
310 | } | |
311 | AliITStrackV2 *itrack=new AliITStrackV2; | |
312 | itsTree->SetBranchAddress("tracks",&itrack); | |
313 | ||
314 | out->cd(); | |
61ab8ea8 | 315 | |
316 | sprintf(tname,"TreeT_ITSb_%d",GetEventNumber()); | |
317 | TTree backTree(tname,"Tree with back propagated ITS tracks"); | |
14825d5a | 318 | AliTPCtrack *otrack=0; |
319 | backTree.Branch("tracks","AliTPCtrack",&otrack,32000,0); | |
320 | ||
321 | Int_t ntrk=0; | |
322 | ||
323 | Int_t nentr=(Int_t)itsTree->GetEntries(); | |
324 | for (Int_t i=0; i<nentr; i++) { | |
325 | itsTree->GetEvent(i); | |
326 | ResetTrackToFollow(*itrack); | |
327 | fTrackToFollow.ResetCovariance(); fTrackToFollow.ResetClusters(); | |
328 | Int_t itsLabel=fTrackToFollow.GetLabel(); //save the ITS track label | |
329 | ||
330 | #ifdef DEBUG | |
331 | if (TMath::Abs(itsLabel)!=LAB) continue; | |
332 | cout<<itsLabel<<" *****************\n"; | |
333 | #endif | |
334 | ||
335 | try { | |
336 | Int_t nc=itrack->GetNumberOfClusters(); | |
337 | #ifdef DEBUG | |
338 | for (Int_t k=0; k<nc; k++) { | |
339 | Int_t index=itrack->GetClusterIndex(k); | |
340 | AliITSclusterV2 *c=(AliITSclusterV2*)GetCluster(index); | |
341 | cout<<c->GetLabel(0)<<' '<<c->GetLabel(1)<<' '<<c->GetLabel(2)<<endl; | |
342 | } | |
343 | #endif | |
344 | Int_t idx=0, l=0; | |
345 | const AliITSclusterV2 *c=0; | |
346 | if (nc--) { | |
347 | idx=itrack->GetClusterIndex(nc); l=(idx&0xf0000000)>>28; | |
348 | c=(AliITSclusterV2*)GetCluster(idx); | |
349 | } | |
350 | for (fI=0; fI<kMaxLayer; fI++) { | |
351 | AliITSlayer &layer=fLayers[fI]; | |
352 | Double_t r=layer.GetR(); | |
353 | if (fI==2 || fI==4) { | |
354 | Double_t rs=0.5*(fLayers[fI-1].GetR() + r); | |
61ab8ea8 | 355 | Double_t d=0.0034, x0=38.6; |
356 | if (fI==2) {rs=9.; d=0.0097; x0=42.;} | |
357 | if (!fTrackToFollow.PropagateTo(rs,-d,x0)) throw ""; | |
14825d5a | 358 | } |
359 | ||
360 | Double_t x,y,z; | |
361 | if (!fTrackToFollow.GetGlobalXYZat(r,x,y,z)) | |
362 | throw "AliITStrackerV2::PropagateBack: failed to estimate track !"; | |
363 | Double_t phi=TMath::ATan2(y,x); | |
14825d5a | 364 | Int_t idet=layer.FindDetectorIndex(phi,z); |
365 | if (idet<0) | |
366 | throw "AliITStrackerV2::PropagateBack: failed to find a detector !\n"; | |
367 | const AliITSdetector &det=layer.GetDetector(idet); | |
368 | r=det.GetR(); phi=det.GetPhi(); | |
a9a2d814 | 369 | if (!fTrackToFollow.Propagate(phi,r)) throw ""; |
370 | fTrackToFollow.SetDetectorIndex(idet); | |
14825d5a | 371 | |
372 | const AliITSclusterV2 *cl=0; | |
373 | Int_t index=0; | |
374 | Double_t maxchi2=kMaxChi2; | |
375 | ||
376 | if (l==fI) { | |
a9a2d814 | 377 | idet=c->GetDetectorIndex(); |
378 | if (idet != fTrackToFollow.GetDetectorIndex()) { | |
14825d5a | 379 | const AliITSdetector &det=layer.GetDetector(idet); |
380 | r=det.GetR(); phi=det.GetPhi(); | |
a9a2d814 | 381 | if (!fTrackToFollow.Propagate(phi,r)) throw ""; |
382 | fTrackToFollow.SetDetectorIndex(idet); | |
14825d5a | 383 | } |
384 | Double_t chi2=fTrackToFollow.GetPredictedChi2(c); | |
385 | if (chi2<kMaxChi2) { | |
386 | cl=c; maxchi2=chi2; index=idx; | |
387 | } | |
388 | if (nc--) { | |
389 | idx=itrack->GetClusterIndex(nc); l=(idx&0xf0000000)>>28; | |
390 | c=(AliITSclusterV2*)GetCluster(idx); | |
391 | } | |
392 | } | |
393 | ||
394 | if (fTrackToFollow.GetNumberOfClusters()>2) { | |
395 | Double_t dz=3*TMath::Sqrt(fTrackToFollow.GetSigmaZ2()+kSigmaZ2[fI]); | |
396 | Double_t dy=3*TMath::Sqrt(fTrackToFollow.GetSigmaY2()+kSigmaY2[fI]); | |
397 | Double_t zmin=fTrackToFollow.GetZ() - dz; | |
398 | Double_t zmax=fTrackToFollow.GetZ() + dz; | |
399 | Double_t ymin=fTrackToFollow.GetY() + phi*r - dy; | |
400 | Double_t ymax=fTrackToFollow.GetY() + phi*r + dy; | |
401 | layer.SelectClusters(zmin,zmax,ymin,ymax); | |
402 | ||
403 | const AliITSclusterV2 *cc=0; Int_t ci; | |
404 | while ((cc=layer.GetNextCluster(ci))!=0) { | |
a9a2d814 | 405 | idet=cc->GetDetectorIndex(); |
406 | if (idet != fTrackToFollow.GetDetectorIndex()) continue; | |
14825d5a | 407 | Double_t chi2=fTrackToFollow.GetPredictedChi2(cc); |
408 | if (chi2<maxchi2) { | |
409 | cl=cc; index=(fI<<28)+ci; maxchi2=chi2; | |
410 | } | |
411 | } | |
412 | } | |
413 | ||
414 | if (cl) { | |
415 | if (!fTrackToFollow.Update(cl,maxchi2,index)) | |
416 | cerr<<"AliITStrackerV2::PropagateBack: filtering failed !\n"; | |
14825d5a | 417 | } |
61ab8ea8 | 418 | { |
419 | Double_t x0; | |
420 | x=layer.GetThickness(fTrackToFollow.GetY(),fTrackToFollow.GetZ(),x0); | |
421 | fTrackToFollow.CorrectForMaterial(-x,x0); | |
422 | } | |
14825d5a | 423 | } |
424 | ||
61ab8ea8 | 425 | fTrackToFollow.PropagateTo(50.,-0.001); |
426 | //Double_t xk=52.,x,y,z; fTrackToFollow.GetGlobalXYZat(xk,x,y,z); | |
427 | //if (TMath::Abs(y)<7.77) fTrackToFollow.PropagateTo(xk,-0.19,24.); | |
428 | fTrackToFollow.PropagateTo(61,-0.0053,30); | |
429 | fTrackToFollow.PropagateTo(80.,-0.0053,30); | |
14825d5a | 430 | |
431 | fTrackToFollow.SetLabel(itsLabel); | |
432 | otrack=new AliTPCtrack(fTrackToFollow,fTrackToFollow.GetAlpha()); | |
433 | backTree.Fill(); delete otrack; | |
434 | UseClusters(&fTrackToFollow); | |
435 | cerr << ++ntrk << " \r"; | |
436 | } | |
437 | catch (const Char_t *msg) { | |
438 | cerr<<msg<<endl; | |
439 | } | |
440 | } | |
441 | ||
442 | backTree.Write(); | |
61ab8ea8 | 443 | |
14825d5a | 444 | cerr<<"Number of ITS tracks: "<<nentr<<endl; |
445 | cerr<<"Number of back propagated ITS tracks: "<<ntrk<<endl; | |
446 | ||
447 | delete itrack; | |
448 | ||
c7ee21ca | 449 | delete itsTree; //Thanks to Mariana Bondila |
450 | ||
61ab8ea8 | 451 | UnloadClusters(); |
452 | ||
453 | savedir->cd(); | |
454 | ||
14825d5a | 455 | return 0; |
456 | } | |
006b5f7f | 457 | |
458 | AliCluster *AliITStrackerV2::GetCluster(Int_t index) const { | |
459 | //-------------------------------------------------------------------- | |
460 | // Return pointer to a given cluster | |
461 | //-------------------------------------------------------------------- | |
462 | Int_t l=(index & 0xf0000000) >> 28; | |
463 | Int_t c=(index & 0x0fffffff) >> 00; | |
464 | return fLayers[l].GetCluster(c); | |
465 | } | |
466 | ||
467 | ||
468 | void AliITStrackerV2::FollowProlongation() { | |
469 | //-------------------------------------------------------------------- | |
470 | //This function finds a track prolongation | |
471 | //-------------------------------------------------------------------- | |
472 | Int_t tryAgain=kLayersToSkip; | |
473 | ||
474 | while (fI) { | |
a9a2d814 | 475 | Int_t i=fI-1; |
006b5f7f | 476 | #ifdef DEBUG |
a9a2d814 | 477 | cout<<i<<' '; |
006b5f7f | 478 | #endif |
a9a2d814 | 479 | AliITSlayer &layer=fLayers[i]; |
480 | AliITStrackV2 &track=fTracks[i]; | |
006b5f7f | 481 | |
14825d5a | 482 | Double_t r=layer.GetR(); |
61ab8ea8 | 483 | |
a9a2d814 | 484 | if (i==3 || i==1) { |
485 | Double_t rs=0.5*(fLayers[i+1].GetR() + r); | |
61ab8ea8 | 486 | Double_t d=0.0034, x0=38.6; |
487 | if (i==1) {rs=9.; d=0.0097; x0=42;} | |
488 | if (!fTrackToFollow.PropagateTo(rs,d,x0)) { | |
a9a2d814 | 489 | //cerr<<"AliITStrackerV2::FollowProlongation: " |
490 | //"propagation failed !\n"; | |
491 | break; | |
492 | } | |
006b5f7f | 493 | } |
494 | ||
495 | //find intersection | |
496 | Double_t x,y,z; | |
14825d5a | 497 | if (!fTrackToFollow.GetGlobalXYZat(r,x,y,z)) { |
7f6ddf58 | 498 | //cerr<<"AliITStrackerV2::FollowProlongation: " |
499 | //"failed to estimate track !\n"; | |
a9a2d814 | 500 | break; |
006b5f7f | 501 | } |
502 | Double_t phi=TMath::ATan2(y,x); | |
006b5f7f | 503 | Int_t idet=layer.FindDetectorIndex(phi,z); |
504 | if (idet<0) { | |
7f6ddf58 | 505 | //cerr<<"AliITStrackerV2::FollowProlongation: " |
506 | //"failed to find a detector !\n"; | |
006b5f7f | 507 | break; |
508 | } | |
509 | ||
510 | //propagate to the intersection | |
511 | const AliITSdetector &det=layer.GetDetector(idet); | |
14825d5a | 512 | phi=det.GetPhi(); |
a9a2d814 | 513 | if (!fTrackToFollow.Propagate(phi,det.GetR())) { |
7f6ddf58 | 514 | //cerr<<"AliITStrackerV2::FollowProlongation: propagation failed !\n"; |
006b5f7f | 515 | break; |
516 | } | |
517 | fTrackToFollow.SetDetectorIndex(idet); | |
518 | ||
519 | //Select possible prolongations and store the current track estimation | |
520 | track.~AliITStrackV2(); new(&track) AliITStrackV2(fTrackToFollow); | |
a9a2d814 | 521 | Double_t dz=3*TMath::Sqrt(track.GetSigmaZ2() + kSigmaZ2[i]); |
14825d5a | 522 | if (dz < 0.5*TMath::Abs(track.GetTgl())) dz=0.5*TMath::Abs(track.GetTgl()); |
7f6ddf58 | 523 | if (dz > kMaxRoad) { |
006b5f7f | 524 | //cerr<<"AliITStrackerV2::FollowProlongation: too broad road in Z !\n"; |
525 | break; | |
526 | } | |
a9a2d814 | 527 | |
528 | if (TMath::Abs(fTrackToFollow.GetZ()-GetZ()) > r+dz) break; | |
529 | ||
530 | Double_t dy=4*TMath::Sqrt(track.GetSigmaY2() + kSigmaY2[i]); | |
14825d5a | 531 | if (dy < 0.5*TMath::Abs(track.GetSnp())) dy=0.5*TMath::Abs(track.GetSnp()); |
7f6ddf58 | 532 | if (dy > kMaxRoad) { |
006b5f7f | 533 | //cerr<<"AliITStrackerV2::FollowProlongation: too broad road in Y !\n"; |
534 | break; | |
535 | } | |
a9a2d814 | 536 | |
7f6ddf58 | 537 | Double_t zmin=track.GetZ() - dz; |
006b5f7f | 538 | Double_t zmax=track.GetZ() + dz; |
14825d5a | 539 | Double_t ymin=track.GetY() + r*phi - dy; |
540 | Double_t ymax=track.GetY() + r*phi + dy; | |
a9a2d814 | 541 | layer.SelectClusters(zmin,zmax,ymin,ymax); |
542 | fI--; | |
006b5f7f | 543 | |
006b5f7f | 544 | //take another prolongation |
545 | if (!TakeNextProlongation()) if (!tryAgain--) break; | |
546 | tryAgain=kLayersToSkip; | |
547 | ||
548 | } | |
549 | ||
550 | //deal with the best track | |
551 | Int_t ncl=fTrackToFollow.GetNumberOfClusters(); | |
552 | Int_t nclb=fBestTrack.GetNumberOfClusters(); | |
553 | if (ncl) | |
554 | if (ncl >= nclb) { | |
555 | Double_t chi2=fTrackToFollow.GetChi2(); | |
556 | if (chi2/ncl < kChi2PerCluster) { | |
557 | if (ncl > nclb || chi2 < fBestTrack.GetChi2()) { | |
558 | ResetBestTrack(); | |
559 | } | |
560 | } | |
561 | } | |
562 | ||
006b5f7f | 563 | } |
564 | ||
006b5f7f | 565 | Int_t AliITStrackerV2::TakeNextProlongation() { |
566 | //-------------------------------------------------------------------- | |
a9a2d814 | 567 | // This function takes another track prolongation |
568 | // | |
569 | // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch | |
006b5f7f | 570 | //-------------------------------------------------------------------- |
006b5f7f | 571 | AliITSlayer &layer=fLayers[fI]; |
4ab260d6 | 572 | ResetTrackToFollow(fTracks[fI]); |
006b5f7f | 573 | |
4ab260d6 | 574 | Double_t dz=4*TMath::Sqrt(fTrackToFollow.GetSigmaZ2() + kSigmaZ2[fI]); |
575 | Double_t dy=4*TMath::Sqrt(fTrackToFollow.GetSigmaY2() + kSigmaY2[fI]); | |
006b5f7f | 576 | |
577 | const AliITSclusterV2 *c=0; Int_t ci=-1; | |
578 | Double_t chi2=12345.; | |
579 | while ((c=layer.GetNextCluster(ci))!=0) { | |
a9a2d814 | 580 | //if (c->GetLabel(0)!=TMath::Abs(lbl)) continue; |
006b5f7f | 581 | Int_t idet=c->GetDetectorIndex(); |
582 | ||
4ab260d6 | 583 | if (fTrackToFollow.GetDetectorIndex()!=idet) { |
006b5f7f | 584 | const AliITSdetector &det=layer.GetDetector(idet); |
4ab260d6 | 585 | ResetTrackToFollow(fTracks[fI]); |
586 | if (!fTrackToFollow.Propagate(det.GetPhi(),det.GetR())) { | |
7f6ddf58 | 587 | //cerr<<"AliITStrackerV2::TakeNextProlongation: " |
588 | //"propagation failed !\n"; | |
006b5f7f | 589 | continue; |
590 | } | |
4ab260d6 | 591 | fTrackToFollow.SetDetectorIndex(idet); |
592 | if (TMath::Abs(fTrackToFollow.GetZ()-GetZ())>layer.GetR()+dz) continue; | |
006b5f7f | 593 | |
594 | #ifdef DEBUG | |
595 | cout<<fI<<" change detector !\n"; | |
596 | #endif | |
597 | ||
598 | } | |
599 | ||
4ab260d6 | 600 | if (TMath::Abs(fTrackToFollow.GetZ() - c->GetZ()) > dz) continue; |
601 | if (TMath::Abs(fTrackToFollow.GetY() - c->GetY()) > dy) continue; | |
006b5f7f | 602 | |
4ab260d6 | 603 | chi2=fTrackToFollow.GetPredictedChi2(c); if (chi2<kMaxChi2) break; |
006b5f7f | 604 | } |
605 | ||
606 | #ifdef DEBUG | |
4ab260d6 | 607 | cout<<fI<<" chi2="<<chi2<<' ' |
608 | <<fTrackToFollow.GetY()<<' '<<fTrackToFollow.GetZ()<<' ' | |
609 | <<dy<<' '<<dz<<endl; | |
61ab8ea8 | 610 | { |
611 | Double_t phi=TMath::ATan(fTrackToFollow.GetY()/fTrackToFollow.GetX()) | |
612 | +fTrackToFollow.GetAlpha(); phi=phi*180./3.141593; | |
613 | cout<<phi<<endl; | |
614 | } | |
006b5f7f | 615 | #endif |
616 | ||
617 | if (chi2>=kMaxChi2) return 0; | |
618 | if (!c) return 0; | |
619 | ||
006b5f7f | 620 | if (!fTrackToFollow.Update(c,chi2,(fI<<28)+ci)) { |
7f6ddf58 | 621 | //cerr<<"AliITStrackerV2::TakeNextProlongation: filtering failed !\n"; |
006b5f7f | 622 | return 0; |
623 | } | |
23efe5f1 | 624 | |
4ab260d6 | 625 | if (fTrackToFollow.GetNumberOfClusters()>1) |
626 | if (TMath::Abs(fTrackToFollow.GetD())>4) return 0; | |
627 | ||
a9a2d814 | 628 | fTrackToFollow. |
629 | SetSampledEdx(c->GetQ(),fTrackToFollow.GetNumberOfClusters()-1); //b.b. | |
630 | ||
631 | { | |
61ab8ea8 | 632 | Double_t x0; |
633 | Double_t d=layer.GetThickness(fTrackToFollow.GetY(),fTrackToFollow.GetZ(),x0); | |
634 | fTrackToFollow.CorrectForMaterial(d,x0); | |
a9a2d814 | 635 | } |
4ab260d6 | 636 | |
a9a2d814 | 637 | if (fConstraint[fPass]) { |
4ab260d6 | 638 | Double_t d=GetEffectiveThickness(0,0); //Think of this !!!! |
639 | fTrackToFollow.Improve(d,GetY(),GetZ()); | |
a9a2d814 | 640 | } |
006b5f7f | 641 | |
642 | #ifdef DEBUG | |
643 | cout<<"accepted lab="<<c->GetLabel(0)<<' ' | |
644 | <<fTrackToFollow.GetNumberOfClusters()<<' ' | |
a9a2d814 | 645 | <<fTrackToFollow.GetY()<<' '<<fTrackToFollow.GetZ()<<' ' |
646 | <<fTrackToFollow.Get1Pt()<<endl<<endl; | |
006b5f7f | 647 | #endif |
648 | ||
649 | return 1; | |
650 | } | |
651 | ||
652 | ||
006b5f7f | 653 | AliITStrackerV2::AliITSlayer::AliITSlayer() { |
654 | //-------------------------------------------------------------------- | |
655 | //default AliITSlayer constructor | |
656 | //-------------------------------------------------------------------- | |
657 | fN=0; | |
658 | fDetectors=0; | |
659 | } | |
660 | ||
661 | AliITStrackerV2::AliITSlayer:: | |
662 | AliITSlayer(Double_t r,Double_t p,Double_t z,Int_t nl,Int_t nd) { | |
663 | //-------------------------------------------------------------------- | |
664 | //main AliITSlayer constructor | |
665 | //-------------------------------------------------------------------- | |
666 | fR=r; fPhiOffset=p; fZOffset=z; | |
667 | fNladders=nl; fNdetectors=nd; | |
668 | fDetectors=new AliITSdetector[fNladders*fNdetectors]; | |
669 | ||
670 | fN=0; | |
671 | fI=0; | |
672 | } | |
673 | ||
674 | AliITStrackerV2::AliITSlayer::~AliITSlayer() { | |
675 | //-------------------------------------------------------------------- | |
676 | // AliITSlayer destructor | |
677 | //-------------------------------------------------------------------- | |
678 | delete[] fDetectors; | |
679 | for (Int_t i=0; i<fN; i++) delete fClusters[i]; | |
680 | } | |
681 | ||
61ab8ea8 | 682 | void AliITStrackerV2::AliITSlayer::ResetClusters() { |
683 | //-------------------------------------------------------------------- | |
684 | // This function removes loaded clusters | |
685 | //-------------------------------------------------------------------- | |
686 | for (Int_t i=0; i<fN; i++) delete fClusters[i]; | |
687 | fN=0; | |
688 | fI=0; | |
689 | } | |
690 | ||
006b5f7f | 691 | Int_t AliITStrackerV2::AliITSlayer::InsertCluster(AliITSclusterV2 *c) { |
692 | //-------------------------------------------------------------------- | |
693 | //This function adds a cluster to this layer | |
694 | //-------------------------------------------------------------------- | |
695 | if (fN==kMaxClusterPerLayer) { | |
a9a2d814 | 696 | cerr<<"AliITStrackerV2::AliITSlayer::InsertCluster(): " |
697 | "Too many clusters !\n"; | |
698 | return 1; | |
006b5f7f | 699 | } |
700 | ||
701 | if (fN==0) {fClusters[fN++]=c; return 0;} | |
702 | Int_t i=FindClusterIndex(c->GetZ()); | |
703 | memmove(fClusters+i+1 ,fClusters+i,(fN-i)*sizeof(AliITSclusterV2*)); | |
704 | fClusters[i]=c; fN++; | |
705 | ||
706 | return 0; | |
707 | } | |
708 | ||
709 | Int_t AliITStrackerV2::AliITSlayer::FindClusterIndex(Double_t z) const { | |
710 | //-------------------------------------------------------------------- | |
711 | // This function returns the index of the nearest cluster | |
712 | //-------------------------------------------------------------------- | |
713 | if (fN==0) return 0; | |
714 | if (z <= fClusters[0]->GetZ()) return 0; | |
715 | if (z > fClusters[fN-1]->GetZ()) return fN; | |
716 | Int_t b=0, e=fN-1, m=(b+e)/2; | |
717 | for (; b<e; m=(b+e)/2) { | |
718 | if (z > fClusters[m]->GetZ()) b=m+1; | |
719 | else e=m; | |
720 | } | |
721 | return m; | |
722 | } | |
723 | ||
724 | void AliITStrackerV2::AliITSlayer:: | |
725 | SelectClusters(Double_t zmin,Double_t zmax,Double_t ymin, Double_t ymax) { | |
726 | //-------------------------------------------------------------------- | |
727 | // This function sets the "window" | |
728 | //-------------------------------------------------------------------- | |
729 | fI=FindClusterIndex(zmin); fZmax=zmax; | |
14825d5a | 730 | Double_t circle=2*TMath::Pi()*fR; |
731 | if (ymax>circle) { ymax-=circle; ymin-=circle; } | |
006b5f7f | 732 | fYmin=ymin; fYmax=ymax; |
733 | } | |
734 | ||
735 | const AliITSclusterV2 *AliITStrackerV2::AliITSlayer::GetNextCluster(Int_t &ci){ | |
736 | //-------------------------------------------------------------------- | |
737 | // This function returns clusters within the "window" | |
738 | //-------------------------------------------------------------------- | |
739 | const AliITSclusterV2 *cluster=0; | |
740 | for (Int_t i=fI; i<fN; i++) { | |
741 | const AliITSclusterV2 *c=fClusters[i]; | |
742 | if (c->GetZ() > fZmax) break; | |
743 | if (c->IsUsed()) continue; | |
744 | const AliITSdetector &det=GetDetector(c->GetDetectorIndex()); | |
745 | Double_t y=fR*det.GetPhi() + c->GetY(); | |
746 | ||
747 | if (y>2.*fR*TMath::Pi()) y -= 2*fR*TMath::Pi(); | |
748 | if (y>1.*fR*TMath::Pi() && fYmax<y) y -= 2*fR*TMath::Pi(); | |
749 | ||
750 | if (y<fYmin) continue; | |
751 | if (y>fYmax) continue; | |
752 | cluster=c; ci=i; | |
753 | fI=i+1; | |
754 | break; | |
755 | } | |
7f6ddf58 | 756 | |
006b5f7f | 757 | return cluster; |
758 | } | |
759 | ||
760 | Int_t AliITStrackerV2::AliITSlayer:: | |
761 | FindDetectorIndex(Double_t phi, Double_t z) const { | |
762 | //-------------------------------------------------------------------- | |
763 | //This function finds the detector crossed by the track | |
764 | //-------------------------------------------------------------------- | |
765 | Double_t dphi=phi-fPhiOffset; | |
766 | if (dphi < 0) dphi += 2*TMath::Pi(); | |
767 | else if (dphi >= 2*TMath::Pi()) dphi -= 2*TMath::Pi(); | |
768 | Int_t np=Int_t(dphi*fNladders*0.5/TMath::Pi()+0.5); | |
3e3e8427 | 769 | if (np>=fNladders) np-=fNladders; |
770 | if (np<0) np+=fNladders; | |
006b5f7f | 771 | |
772 | Double_t dz=fZOffset-z; | |
773 | Int_t nz=Int_t(dz*(fNdetectors-1)*0.5/fZOffset+0.5); | |
3e3e8427 | 774 | if (nz>=fNdetectors) return -1; |
775 | if (nz<0) return -1; | |
006b5f7f | 776 | |
777 | #ifdef DEBUG | |
778 | cout<<np<<' '<<nz<<endl; | |
779 | #endif | |
780 | ||
781 | return np*fNdetectors + nz; | |
782 | } | |
783 | ||
784 | Double_t | |
61ab8ea8 | 785 | AliITStrackerV2::AliITSlayer::GetThickness(Double_t y,Double_t z,Double_t &x0) |
786 | const { | |
a9a2d814 | 787 | //-------------------------------------------------------------------- |
788 | //This function returns the layer thickness at this point (units X0) | |
789 | //-------------------------------------------------------------------- | |
790 | Double_t d=0.0085; | |
61ab8ea8 | 791 | x0=21.82; |
a9a2d814 | 792 | |
793 | if (43<fR&&fR<45) { //SSD2 | |
61ab8ea8 | 794 | Double_t dd=0.0034; |
795 | d=dd; | |
796 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
797 | if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);} | |
798 | if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);} | |
a9a2d814 | 799 | for (Int_t i=0; i<12; i++) { |
61ab8ea8 | 800 | if (TMath::Abs(z-3.9*(i+0.5))<0.15) { |
801 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
802 | d+=0.0034; | |
803 | break; | |
804 | } | |
805 | if (TMath::Abs(z+3.9*(i+0.5))<0.15) { | |
806 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
807 | d+=0.0034; | |
808 | break; | |
809 | } | |
810 | if (TMath::Abs(z-3.4-3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
811 | if (TMath::Abs(z+0.5+3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
a9a2d814 | 812 | } |
813 | } else | |
814 | if (37<fR&&fR<41) { //SSD1 | |
61ab8ea8 | 815 | Double_t dd=0.0034; |
816 | d=dd; | |
817 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
818 | if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);} | |
819 | if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);} | |
a9a2d814 | 820 | for (Int_t i=0; i<11; i++) { |
61ab8ea8 | 821 | if (TMath::Abs(z-3.9*i)<0.15) { |
822 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
823 | d+=dd; | |
824 | break; | |
825 | } | |
826 | if (TMath::Abs(z+3.9*i)<0.15) { | |
827 | if (TMath::Abs(y-0.00)>3.40) d+=dd; | |
828 | d+=dd; | |
829 | break; | |
830 | } | |
831 | if (TMath::Abs(z-1.85-3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
832 | if (TMath::Abs(z+2.05+3.9*i)<0.50) {d+=(0.016-0.0034); break;} | |
a9a2d814 | 833 | } |
834 | } else | |
835 | if (13<fR&&fR<26) { //SDD | |
61ab8ea8 | 836 | Double_t dd=0.0033; |
837 | d=dd; | |
838 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
839 | ||
840 | if (TMath::Abs(y-1.80)<0.55) { | |
841 | d+=0.016; | |
842 | for (Int_t j=0; j<20; j++) { | |
843 | if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
844 | if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
845 | } | |
846 | } | |
847 | if (TMath::Abs(y+1.80)<0.55) { | |
848 | d+=0.016; | |
849 | for (Int_t j=0; j<20; j++) { | |
850 | if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
851 | if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;} | |
852 | } | |
853 | } | |
854 | ||
855 | for (Int_t i=0; i<4; i++) { | |
856 | if (TMath::Abs(z-7.3*i)<0.60) { | |
857 | d+=dd; | |
858 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
859 | break; | |
860 | } | |
861 | if (TMath::Abs(z+7.3*i)<0.60) { | |
862 | d+=dd; | |
863 | if (TMath::Abs(y-0.00)>3.30) d+=dd; | |
864 | break; | |
865 | } | |
a9a2d814 | 866 | } |
867 | } else | |
868 | if (6<fR&&fR<8) { //SPD2 | |
61ab8ea8 | 869 | Double_t dd=0.0063; x0=21.5; |
870 | d=dd; | |
871 | if (TMath::Abs(y-3.08)>0.5) d+=dd; | |
872 | //if (TMath::Abs(y-3.08)>0.45) d+=dd; | |
873 | if (TMath::Abs(y-3.03)<0.10) {d+=0.014;} | |
a9a2d814 | 874 | } else |
875 | if (3<fR&&fR<5) { //SPD1 | |
61ab8ea8 | 876 | Double_t dd=0.0063; x0=21.5; |
877 | d=dd; | |
878 | if (TMath::Abs(y+0.21)>0.6) d+=dd; | |
879 | //if (TMath::Abs(y+0.21)>0.45) d+=dd; | |
880 | if (TMath::Abs(y+0.10)<0.10) {d+=0.014;} | |
a9a2d814 | 881 | } |
882 | ||
61ab8ea8 | 883 | #ifdef DEBUG |
884 | cout<<"d="<<d<<endl; | |
885 | #endif | |
006b5f7f | 886 | |
a9a2d814 | 887 | return d; |
888 | } | |
006b5f7f | 889 | |
a9a2d814 | 890 | Double_t AliITStrackerV2::GetEffectiveThickness(Double_t y,Double_t z) const |
006b5f7f | 891 | { |
892 | //-------------------------------------------------------------------- | |
a9a2d814 | 893 | //Returns the thickness between the current layer and the vertex (units X0) |
006b5f7f | 894 | //-------------------------------------------------------------------- |
61ab8ea8 | 895 | Double_t d=0.0028*3*3; //beam pipe |
896 | Double_t x0=0; | |
006b5f7f | 897 | |
898 | Double_t xn=fLayers[fI].GetR(); | |
899 | for (Int_t i=0; i<fI; i++) { | |
900 | Double_t xi=fLayers[i].GetR(); | |
61ab8ea8 | 901 | d+=fLayers[i].GetThickness(y,z,x0)*xi*xi; |
006b5f7f | 902 | } |
903 | ||
904 | if (fI>1) { | |
61ab8ea8 | 905 | Double_t xi=9.; |
906 | d+=0.0097*xi*xi; | |
006b5f7f | 907 | } |
908 | ||
909 | if (fI>3) { | |
910 | Double_t xi=0.5*(fLayers[3].GetR()+fLayers[4].GetR()); | |
61ab8ea8 | 911 | d+=0.0034*xi*xi; |
006b5f7f | 912 | } |
61ab8ea8 | 913 | |
006b5f7f | 914 | return d/(xn*xn); |
915 | } | |
916 | ||
006b5f7f | 917 | Int_t AliITStrackerV2::AliITSlayer::InRoad() const { |
918 | //-------------------------------------------------------------------- | |
919 | // This function returns number of clusters within the "window" | |
920 | //-------------------------------------------------------------------- | |
921 | Int_t ncl=0; | |
922 | for (Int_t i=fI; i<fN; i++) { | |
923 | const AliITSclusterV2 *c=fClusters[i]; | |
924 | if (c->GetZ() > fZmax) break; | |
a9a2d814 | 925 | if (c->IsUsed()) continue; |
006b5f7f | 926 | const AliITSdetector &det=GetDetector(c->GetDetectorIndex()); |
927 | Double_t y=fR*det.GetPhi() + c->GetY(); | |
928 | ||
929 | if (y>2.*fR*TMath::Pi()) y -= 2*fR*TMath::Pi(); | |
930 | if (y>1.*fR*TMath::Pi() && fYmax<y) y -= 2*fR*TMath::Pi(); | |
931 | ||
932 | if (y<fYmin) continue; | |
933 | if (y>fYmax) continue; | |
934 | ncl++; | |
935 | } | |
936 | return ncl; | |
937 | } | |
938 | ||
4ab260d6 | 939 | Bool_t AliITStrackerV2::RefitAt(Double_t x, AliITStrackV2 *t, Int_t *index) { |
940 | //-------------------------------------------------------------------- | |
941 | // This function refits a track at a given position | |
942 | //-------------------------------------------------------------------- | |
943 | Int_t from, to, step; | |
944 | if (x > t->GetX()) { | |
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) { | |
953 | AliITSlayer &layer=fLayers[i]; | |
954 | Double_t r=layer.GetR(); | |
955 | ||
956 | { | |
957 | Double_t hI=i-0.5*step; | |
958 | if (hI==1.5 || hI==3.5) { | |
959 | Double_t rs=0.5*(fLayers[i-step].GetR() + r); | |
61ab8ea8 | 960 | Double_t d=0.0034, x0=38.6; |
961 | if (hI==1.5) {rs=9.; d=0.0097; x0=42;} | |
962 | if (!t->PropagateTo(rs,d,x0)) { | |
4ab260d6 | 963 | return kFALSE; |
964 | } | |
965 | } | |
966 | } | |
967 | ||
968 | Double_t x,y,z; | |
969 | if (!t->GetGlobalXYZat(r,x,y,z)) { | |
970 | return kFALSE; | |
971 | } | |
972 | Double_t phi=TMath::ATan2(y,x); | |
973 | Int_t idet=layer.FindDetectorIndex(phi,z); | |
974 | if (idet<0) { | |
975 | return kFALSE; | |
976 | } | |
977 | const AliITSdetector &det=layer.GetDetector(idet); | |
978 | phi=det.GetPhi(); | |
979 | if (!t->Propagate(phi,det.GetR())) { | |
980 | return kFALSE; | |
981 | } | |
982 | t->SetDetectorIndex(idet); | |
983 | ||
984 | const AliITSclusterV2 *cl=0; | |
985 | Double_t maxchi2=kMaxChi2; | |
986 | ||
987 | Int_t idx=index[i]; | |
988 | if (idx>0) { | |
989 | const AliITSclusterV2 *c=(AliITSclusterV2 *)GetCluster(idx); | |
990 | if (idet != c->GetDetectorIndex()) { | |
991 | idet=c->GetDetectorIndex(); | |
992 | const AliITSdetector &det=layer.GetDetector(idet); | |
993 | if (!t->Propagate(det.GetPhi(),det.GetR())) { | |
994 | return kFALSE; | |
995 | } | |
996 | t->SetDetectorIndex(idet); | |
997 | } | |
998 | Double_t chi2=t->GetPredictedChi2(c); | |
999 | if (chi2<maxchi2) { cl=c; maxchi2=chi2; } | |
1000 | else return kFALSE; | |
1001 | } | |
1002 | ||
1003 | /* | |
1004 | if (cl==0) | |
1005 | if (t->GetNumberOfClusters()>2) { | |
1006 | Double_t dz=4*TMath::Sqrt(t->GetSigmaZ2()+kSigmaZ2[i]); | |
1007 | Double_t dy=4*TMath::Sqrt(t->GetSigmaY2()+kSigmaY2[i]); | |
1008 | Double_t zmin=t->GetZ() - dz; | |
1009 | Double_t zmax=t->GetZ() + dz; | |
1010 | Double_t ymin=t->GetY() + phi*r - dy; | |
1011 | Double_t ymax=t->GetY() + phi*r + dy; | |
1012 | layer.SelectClusters(zmin,zmax,ymin,ymax); | |
1013 | ||
1014 | const AliITSclusterV2 *c=0; Int_t ci=-1; | |
1015 | while ((c=layer.GetNextCluster(ci))!=0) { | |
1016 | if (idet != c->GetDetectorIndex()) continue; | |
1017 | Double_t chi2=t->GetPredictedChi2(c); | |
1018 | if (chi2<maxchi2) { cl=c; maxchi2=chi2; idx=ci; } | |
1019 | } | |
1020 | } | |
1021 | */ | |
1022 | ||
1023 | if (cl) { | |
1024 | if (!t->Update(cl,maxchi2,idx)) { | |
1025 | return kFALSE; | |
1026 | } | |
1027 | } | |
1028 | ||
1029 | { | |
61ab8ea8 | 1030 | Double_t x0; |
1031 | Double_t d=layer.GetThickness(t->GetY(),t->GetZ(),x0); | |
1032 | t->CorrectForMaterial(-step*d,x0); | |
4ab260d6 | 1033 | } |
1034 | ||
1035 | } | |
1036 | ||
1037 | if (!t->PropagateTo(x,0.,0.)) return kFALSE; | |
1038 | return kTRUE; | |
1039 | } | |
1040 | ||
006b5f7f | 1041 | |
1042 |