]>
Commit | Line | Data |
---|---|---|
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> | |
25 | #include <iostream.h> | |
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 | |
4ab260d6 | 36 | Int_t LAB=70201; |
006b5f7f | 37 | #endif |
38 | ||
006b5f7f | 39 | AliITStrackerV2::AliITSlayer AliITStrackerV2::fLayers[kMaxLayer]; // ITS layers |
40 | ||
41 | AliITStrackerV2:: | |
7f6ddf58 | 42 | AliITStrackerV2(const AliITSgeom *geom, Int_t eventn) throw (const Char_t *) : |
43 | AliTracker() { | |
006b5f7f | 44 | //-------------------------------------------------------------------- |
45 | //This is the AliITStracker constructor | |
46 | //It also reads clusters from a root file | |
47 | //-------------------------------------------------------------------- | |
7f6ddf58 | 48 | fEventN=eventn; //MI change add event number - used to generate identifier |
006b5f7f | 49 | |
50 | AliITSgeom *g=(AliITSgeom*)geom; | |
51 | ||
52 | Float_t x,y,z; | |
53 | Int_t i; | |
54 | for (i=1; i<kMaxLayer+1; i++) { | |
55 | Int_t nlad=g->GetNladders(i); | |
56 | Int_t ndet=g->GetNdetectors(i); | |
57 | ||
58 | g->GetTrans(i,1,1,x,y,z); | |
59 | Double_t r=TMath::Sqrt(x*x + y*y); | |
60 | Double_t poff=TMath::ATan2(y,x); | |
61 | Double_t zoff=z; | |
62 | ||
63 | g->GetTrans(i,1,2,x,y,z); | |
64 | r += TMath::Sqrt(x*x + y*y); | |
65 | g->GetTrans(i,2,1,x,y,z); | |
66 | r += TMath::Sqrt(x*x + y*y); | |
67 | g->GetTrans(i,2,2,x,y,z); | |
68 | r += TMath::Sqrt(x*x + y*y); | |
69 | r*=0.25; | |
70 | ||
71 | new (fLayers+i-1) AliITSlayer(r,poff,zoff,nlad,ndet); | |
72 | ||
73 | for (Int_t j=1; j<nlad+1; j++) { | |
74 | for (Int_t k=1; k<ndet+1; k++) { //Fill this layer with detectors | |
75 | Float_t x,y,zshift; g->GetTrans(i,j,k,x,y,zshift); | |
76 | Double_t rot[9]; g->GetRotMatrix(i,j,k,rot); | |
77 | ||
78 | Double_t r =-x*rot[1] + y*rot[0]; if (i==1) r=-r; | |
79 | Double_t phi=TMath::ATan2(rot[1],rot[0]); if (i==1) phi-=3.1415927; | |
80 | phi+=0.5*TMath::Pi(); | |
81 | AliITSdetector &det=fLayers[i-1].GetDetector((j-1)*ndet + k-1); | |
82 | ||
83 | if (phi<0) phi += 2*TMath::Pi(); | |
84 | ||
85 | new(&det) AliITSdetector(r,phi); | |
86 | } | |
87 | } | |
88 | ||
89 | } | |
90 | ||
91 | try { | |
92 | //Read clusters | |
c7ee21ca | 93 | //MI change |
94 | char cname[100]; | |
95 | sprintf(cname,"TreeC_ITS_%d",eventn); | |
743a19f2 | 96 | TTree *cTree=(TTree*)gDirectory->Get(cname); |
743a19f2 | 97 | |
006b5f7f | 98 | if (!cTree) throw |
99 | ("AliITStrackerV2::AliITStrackerV2 can't get cTree !\n"); | |
100 | ||
101 | TBranch *branch=cTree->GetBranch("Clusters"); | |
102 | if (!branch) throw | |
103 | ("AliITStrackerV2::AliITStrackerV2 can't get Clusters branch !\n"); | |
104 | ||
105 | TClonesArray dummy("AliITSclusterV2",10000), *clusters=&dummy; | |
106 | branch->SetAddress(&clusters); | |
107 | ||
108 | Int_t nentr=(Int_t)cTree->GetEntries(); | |
109 | for (i=0; i<nentr; i++) { | |
110 | if (!cTree->GetEvent(i)) continue; | |
14825d5a | 111 | Int_t lay,lad,det; g->GetModuleId(i,lay,lad,det); |
006b5f7f | 112 | Int_t ncl=clusters->GetEntriesFast(); |
113 | while (ncl--) { | |
114 | AliITSclusterV2 *c=(AliITSclusterV2*)clusters->UncheckedAt(ncl); | |
115 | ||
116 | #ifdef DEBUG | |
117 | if (c->GetLabel(2)!=LAB) | |
118 | if (c->GetLabel(1)!=LAB) | |
119 | if (c->GetLabel(0)!=LAB) continue; | |
120 | cout<<lay-1<<' '<<lad-1<<' '<<det-1<<' '<<c->GetY()<<' '<<c->GetZ()<<endl; | |
121 | #endif | |
122 | ||
7f6ddf58 | 123 | fLayers[lay-1].InsertCluster(new AliITSclusterV2(*c)); |
006b5f7f | 124 | } |
125 | clusters->Delete(); | |
126 | } | |
c7ee21ca | 127 | delete cTree; //Thanks to Mariana Bondila |
006b5f7f | 128 | } |
129 | catch (const Char_t *msg) { | |
130 | cerr<<msg<<endl; | |
131 | throw; | |
132 | } | |
133 | ||
134 | fI=kMaxLayer; | |
7f6ddf58 | 135 | |
136 | fPass=0; | |
137 | fConstraint[0]=1; fConstraint[1]=0; | |
006b5f7f | 138 | } |
139 | ||
4ab260d6 | 140 | //#ifdef DEBUG |
006b5f7f | 141 | static Int_t lbl; |
4ab260d6 | 142 | //#endif |
006b5f7f | 143 | |
144 | Int_t AliITStrackerV2::Clusters2Tracks(const TFile *inp, TFile *out) { | |
145 | //-------------------------------------------------------------------- | |
146 | //This functions reconstructs ITS tracks | |
147 | //-------------------------------------------------------------------- | |
148 | TFile *in=(TFile*)inp; | |
149 | TDirectory *savedir=gDirectory; | |
150 | ||
151 | if (!in->IsOpen()) { | |
152 | cerr<<"AliITStrackerV2::Clusters2Tracks(): "; | |
153 | cerr<<"file with TPC tracks is not open !\n"; | |
154 | return 1; | |
155 | } | |
156 | ||
157 | if (!out->IsOpen()) { | |
158 | cerr<<"AliITStrackerV2::Clusters2Tracks(): "; | |
159 | cerr<<"file for ITS tracks is not open !\n"; | |
160 | return 2; | |
161 | } | |
162 | ||
7f6ddf58 | 163 | in->cd(); |
164 | ||
743a19f2 | 165 | char tname[100]; |
a7554aa9 | 166 | Int_t nentr=0; TObjArray itsTracks(15000); |
7f6ddf58 | 167 | |
168 | {/* Read TPC tracks */ | |
169 | sprintf(tname,"TreeT_TPC_%d",fEventN); | |
170 | TTree *tpcTree=(TTree*)in->Get(tname); | |
171 | if (!tpcTree) { | |
172 | cerr<<"AliITStrackerV2::Clusters2Tracks(): " | |
173 | "can't get a tree with TPC tracks !\n"; | |
174 | return 3; | |
175 | } | |
176 | AliTPCtrack *itrack=new AliTPCtrack; | |
177 | tpcTree->SetBranchAddress("tracks",&itrack); | |
178 | nentr=(Int_t)tpcTree->GetEntries(); | |
179 | for (Int_t i=0; i<nentr; i++) { | |
180 | tpcTree->GetEvent(i); | |
4ab260d6 | 181 | AliITStrackV2 *t=0; |
182 | try { | |
183 | t=new AliITStrackV2(*itrack); | |
184 | } catch (const Char_t *msg) { | |
185 | cerr<<msg<<endl; | |
186 | delete t; | |
187 | continue; | |
188 | } | |
a9a2d814 | 189 | if (TMath::Abs(t->GetD())>4) continue; |
190 | ||
191 | t->PropagateTo(80.,0.0053); | |
192 | if (TMath::Abs(t->GetY())>13.) t->CorrectForMaterial(0.03); | |
193 | if (TMath::Abs(t->GetZ())<0.2) t->CorrectForMaterial(0.40); | |
194 | t->PropagateTo(61.,0.0052); | |
195 | Double_t xk=52.,x,y,z; t->GetGlobalXYZat(xk,x,y,z); | |
196 | if (TMath::Abs(y)<7.77) t->PropagateTo(xk,0.19,24.); | |
197 | t->PropagateTo(50.,0.001); | |
198 | ||
199 | itsTracks.AddLast(t); | |
7f6ddf58 | 200 | } |
201 | delete tpcTree; //Thanks to Mariana Bondila | |
202 | delete itrack; | |
006b5f7f | 203 | } |
7f6ddf58 | 204 | itsTracks.Sort(); |
006b5f7f | 205 | |
206 | out->cd(); | |
7f6ddf58 | 207 | |
208 | sprintf(tname,"TreeT_ITS_%d",fEventN); | |
209 | TTree itsTree(tname,"Tree with ITS tracks"); | |
006b5f7f | 210 | AliITStrackV2 *otrack=&fBestTrack; |
211 | itsTree.Branch("tracks","AliITStrackV2",&otrack,32000,0); | |
212 | ||
7f6ddf58 | 213 | for (fPass=0; fPass<2; fPass++) { |
214 | Int_t &constraint=fConstraint[fPass]; if (constraint<0) continue; | |
215 | for (Int_t i=0; i<nentr; i++) { | |
216 | if (i%10==0) cerr<<nentr-i<<" \r"; | |
217 | AliITStrackV2 *t=(AliITStrackV2*)itsTracks.UncheckedAt(i); | |
218 | if (t==0) continue; //this track has been already tracked | |
219 | Int_t tpcLabel=t->GetLabel(); //save the TPC track label | |
a9a2d814 | 220 | |
4ab260d6 | 221 | lbl=tpcLabel; |
006b5f7f | 222 | #ifdef DEBUG |
14825d5a | 223 | lbl=tpcLabel; |
006b5f7f | 224 | if (TMath::Abs(tpcLabel)!=LAB) continue; |
225 | cout<<tpcLabel<<" *****************\n"; | |
226 | #endif | |
a9a2d814 | 227 | |
4ab260d6 | 228 | ResetTrackToFollow(*t); |
7f6ddf58 | 229 | ResetBestTrack(); |
006b5f7f | 230 | |
7f6ddf58 | 231 | for (FollowProlongation(); fI<kMaxLayer; fI++) { |
232 | while (TakeNextProlongation()) FollowProlongation(); | |
233 | } | |
006b5f7f | 234 | |
235 | #ifdef DEBUG | |
236 | cout<<fBestTrack.GetNumberOfClusters()<<" number of clusters\n\n"; | |
237 | #endif | |
238 | ||
4ab260d6 | 239 | if (fBestTrack.GetNumberOfClusters() < kMaxLayer-kLayersToSkip) continue; |
240 | ||
241 | if (fConstraint[fPass]) { | |
242 | Int_t index[kMaxLayer]; | |
243 | Int_t k; | |
244 | for (k=0; k<kMaxLayer; k++) index[k]=-1; | |
245 | Int_t nc=fBestTrack.GetNumberOfClusters(); | |
246 | for (k=0; k<nc; k++) { | |
247 | Int_t idx=fBestTrack.GetClusterIndex(k),nl=(idx&0xf0000000)>>28; | |
248 | index[nl]=idx; | |
249 | } | |
250 | fBestTrack.~AliITStrackV2(); new(&fBestTrack) AliITStrackV2(*t); | |
251 | if (!RefitAt(3.7, &fBestTrack, index)) continue; | |
252 | } | |
253 | ||
254 | fBestTrack.SetLabel(tpcLabel); | |
255 | fBestTrack.CookdEdx(); | |
256 | CookLabel(&fBestTrack,0.); //For comparison only | |
257 | itsTree.Fill(); | |
258 | UseClusters(&fBestTrack); | |
259 | delete itsTracks.RemoveAt(i); | |
006b5f7f | 260 | |
7f6ddf58 | 261 | } |
006b5f7f | 262 | } |
006b5f7f | 263 | |
7f6ddf58 | 264 | itsTree.Write(); |
c7ee21ca | 265 | |
7f6ddf58 | 266 | itsTracks.Delete(); |
267 | savedir->cd(); | |
268 | cerr<<"Number of TPC tracks: "<<nentr<<endl; | |
269 | cerr<<"Number of prolonged tracks: "<<itsTree.GetEntries()<<endl; | |
006b5f7f | 270 | |
271 | return 0; | |
272 | } | |
273 | ||
14825d5a | 274 | Int_t AliITStrackerV2::PropagateBack(const TFile *inp, TFile *out) { |
275 | //-------------------------------------------------------------------- | |
276 | //This functions propagates reconstructed ITS tracks back | |
277 | //-------------------------------------------------------------------- | |
278 | TFile *in=(TFile*)inp; | |
279 | TDirectory *savedir=gDirectory; | |
280 | ||
281 | if (!in->IsOpen()) { | |
282 | cerr<<"AliITStrackerV2::PropagateBack(): "; | |
283 | cerr<<"file with ITS tracks is not open !\n"; | |
284 | return 1; | |
285 | } | |
286 | ||
287 | if (!out->IsOpen()) { | |
288 | cerr<<"AliITStrackerV2::PropagateBack(): "; | |
289 | cerr<<"file for back propagated ITS tracks is not open !\n"; | |
290 | return 2; | |
291 | } | |
292 | ||
293 | in->cd(); | |
c7ee21ca | 294 | TTree *itsTree=(TTree*)in->Get("TreeT_ITS_0"); |
14825d5a | 295 | if (!itsTree) { |
296 | cerr<<"AliITStrackerV2::PropagateBack() "; | |
297 | cerr<<"can't get a tree with ITS tracks !\n"; | |
298 | return 3; | |
299 | } | |
300 | AliITStrackV2 *itrack=new AliITStrackV2; | |
301 | itsTree->SetBranchAddress("tracks",&itrack); | |
302 | ||
303 | out->cd(); | |
c7ee21ca | 304 | TTree backTree("TreeT_ITSb_0","Tree with back propagated ITS tracks"); |
14825d5a | 305 | AliTPCtrack *otrack=0; |
306 | backTree.Branch("tracks","AliTPCtrack",&otrack,32000,0); | |
307 | ||
308 | Int_t ntrk=0; | |
309 | ||
310 | Int_t nentr=(Int_t)itsTree->GetEntries(); | |
311 | for (Int_t i=0; i<nentr; i++) { | |
312 | itsTree->GetEvent(i); | |
313 | ResetTrackToFollow(*itrack); | |
314 | fTrackToFollow.ResetCovariance(); fTrackToFollow.ResetClusters(); | |
315 | Int_t itsLabel=fTrackToFollow.GetLabel(); //save the ITS track label | |
316 | ||
317 | #ifdef DEBUG | |
318 | if (TMath::Abs(itsLabel)!=LAB) continue; | |
319 | cout<<itsLabel<<" *****************\n"; | |
320 | #endif | |
321 | ||
322 | try { | |
323 | Int_t nc=itrack->GetNumberOfClusters(); | |
324 | #ifdef DEBUG | |
325 | for (Int_t k=0; k<nc; k++) { | |
326 | Int_t index=itrack->GetClusterIndex(k); | |
327 | AliITSclusterV2 *c=(AliITSclusterV2*)GetCluster(index); | |
328 | cout<<c->GetLabel(0)<<' '<<c->GetLabel(1)<<' '<<c->GetLabel(2)<<endl; | |
329 | } | |
330 | #endif | |
331 | Int_t idx=0, l=0; | |
332 | const AliITSclusterV2 *c=0; | |
333 | if (nc--) { | |
334 | idx=itrack->GetClusterIndex(nc); l=(idx&0xf0000000)>>28; | |
335 | c=(AliITSclusterV2*)GetCluster(idx); | |
336 | } | |
337 | for (fI=0; fI<kMaxLayer; fI++) { | |
338 | AliITSlayer &layer=fLayers[fI]; | |
339 | Double_t r=layer.GetR(); | |
340 | if (fI==2 || fI==4) { | |
341 | Double_t rs=0.5*(fLayers[fI-1].GetR() + r); | |
342 | Double_t ds=0.034; if (fI==4) ds=0.039; | |
343 | Double_t dx0r=ds/21.82*2.33, dr=ds*2.33; | |
344 | if (!fTrackToFollow.PropagateTo(rs,1*dx0r,dr)) throw ""; | |
345 | } | |
346 | ||
347 | Double_t x,y,z; | |
348 | if (!fTrackToFollow.GetGlobalXYZat(r,x,y,z)) | |
349 | throw "AliITStrackerV2::PropagateBack: failed to estimate track !"; | |
350 | Double_t phi=TMath::ATan2(y,x); | |
14825d5a | 351 | Int_t idet=layer.FindDetectorIndex(phi,z); |
352 | if (idet<0) | |
353 | throw "AliITStrackerV2::PropagateBack: failed to find a detector !\n"; | |
354 | const AliITSdetector &det=layer.GetDetector(idet); | |
355 | r=det.GetR(); phi=det.GetPhi(); | |
a9a2d814 | 356 | if (!fTrackToFollow.Propagate(phi,r)) throw ""; |
357 | fTrackToFollow.SetDetectorIndex(idet); | |
14825d5a | 358 | |
359 | const AliITSclusterV2 *cl=0; | |
360 | Int_t index=0; | |
361 | Double_t maxchi2=kMaxChi2; | |
362 | ||
363 | if (l==fI) { | |
a9a2d814 | 364 | idet=c->GetDetectorIndex(); |
365 | if (idet != fTrackToFollow.GetDetectorIndex()) { | |
14825d5a | 366 | const AliITSdetector &det=layer.GetDetector(idet); |
367 | r=det.GetR(); phi=det.GetPhi(); | |
a9a2d814 | 368 | if (!fTrackToFollow.Propagate(phi,r)) throw ""; |
369 | fTrackToFollow.SetDetectorIndex(idet); | |
14825d5a | 370 | } |
371 | Double_t chi2=fTrackToFollow.GetPredictedChi2(c); | |
372 | if (chi2<kMaxChi2) { | |
373 | cl=c; maxchi2=chi2; index=idx; | |
374 | } | |
375 | if (nc--) { | |
376 | idx=itrack->GetClusterIndex(nc); l=(idx&0xf0000000)>>28; | |
377 | c=(AliITSclusterV2*)GetCluster(idx); | |
378 | } | |
379 | } | |
380 | ||
381 | if (fTrackToFollow.GetNumberOfClusters()>2) { | |
382 | Double_t dz=3*TMath::Sqrt(fTrackToFollow.GetSigmaZ2()+kSigmaZ2[fI]); | |
383 | Double_t dy=3*TMath::Sqrt(fTrackToFollow.GetSigmaY2()+kSigmaY2[fI]); | |
384 | Double_t zmin=fTrackToFollow.GetZ() - dz; | |
385 | Double_t zmax=fTrackToFollow.GetZ() + dz; | |
386 | Double_t ymin=fTrackToFollow.GetY() + phi*r - dy; | |
387 | Double_t ymax=fTrackToFollow.GetY() + phi*r + dy; | |
388 | layer.SelectClusters(zmin,zmax,ymin,ymax); | |
389 | ||
390 | const AliITSclusterV2 *cc=0; Int_t ci; | |
391 | while ((cc=layer.GetNextCluster(ci))!=0) { | |
a9a2d814 | 392 | idet=cc->GetDetectorIndex(); |
393 | if (idet != fTrackToFollow.GetDetectorIndex()) continue; | |
14825d5a | 394 | Double_t chi2=fTrackToFollow.GetPredictedChi2(cc); |
395 | if (chi2<maxchi2) { | |
396 | cl=cc; index=(fI<<28)+ci; maxchi2=chi2; | |
397 | } | |
398 | } | |
399 | } | |
400 | ||
401 | if (cl) { | |
402 | if (!fTrackToFollow.Update(cl,maxchi2,index)) | |
403 | cerr<<"AliITStrackerV2::PropagateBack: filtering failed !\n"; | |
14825d5a | 404 | } |
a9a2d814 | 405 | |
406 | x=layer.GetThickness(fTrackToFollow.GetY(),fTrackToFollow.GetZ()); | |
407 | fTrackToFollow.CorrectForMaterial(-x); | |
408 | ||
14825d5a | 409 | } |
410 | ||
a9a2d814 | 411 | Double_t xk=52.,x,y,z; fTrackToFollow.GetGlobalXYZat(xk,x,y,z); |
412 | if (TMath::Abs(y)<7.77) | |
413 | fTrackToFollow.PropagateTo(xk,-0.19,24.); | |
414 | fTrackToFollow.PropagateTo(61,-0.0110); | |
415 | fTrackToFollow.PropagateTo(80.,-0.0053); | |
14825d5a | 416 | |
417 | fTrackToFollow.SetLabel(itsLabel); | |
418 | otrack=new AliTPCtrack(fTrackToFollow,fTrackToFollow.GetAlpha()); | |
419 | backTree.Fill(); delete otrack; | |
420 | UseClusters(&fTrackToFollow); | |
421 | cerr << ++ntrk << " \r"; | |
422 | } | |
423 | catch (const Char_t *msg) { | |
424 | cerr<<msg<<endl; | |
425 | } | |
426 | } | |
427 | ||
428 | backTree.Write(); | |
429 | savedir->cd(); | |
430 | cerr<<"Number of ITS tracks: "<<nentr<<endl; | |
431 | cerr<<"Number of back propagated ITS tracks: "<<ntrk<<endl; | |
432 | ||
433 | delete itrack; | |
434 | ||
c7ee21ca | 435 | delete itsTree; //Thanks to Mariana Bondila |
436 | ||
14825d5a | 437 | return 0; |
438 | } | |
006b5f7f | 439 | |
a9a2d814 | 440 | |
006b5f7f | 441 | AliCluster *AliITStrackerV2::GetCluster(Int_t index) const { |
442 | //-------------------------------------------------------------------- | |
443 | // Return pointer to a given cluster | |
444 | //-------------------------------------------------------------------- | |
445 | Int_t l=(index & 0xf0000000) >> 28; | |
446 | Int_t c=(index & 0x0fffffff) >> 00; | |
447 | return fLayers[l].GetCluster(c); | |
448 | } | |
449 | ||
450 | ||
451 | void AliITStrackerV2::FollowProlongation() { | |
452 | //-------------------------------------------------------------------- | |
453 | //This function finds a track prolongation | |
454 | //-------------------------------------------------------------------- | |
455 | Int_t tryAgain=kLayersToSkip; | |
456 | ||
457 | while (fI) { | |
a9a2d814 | 458 | Int_t i=fI-1; |
006b5f7f | 459 | #ifdef DEBUG |
a9a2d814 | 460 | cout<<i<<' '; |
006b5f7f | 461 | #endif |
a9a2d814 | 462 | AliITSlayer &layer=fLayers[i]; |
463 | AliITStrackV2 &track=fTracks[i]; | |
006b5f7f | 464 | |
14825d5a | 465 | Double_t r=layer.GetR(); |
a9a2d814 | 466 | if (i==3 || i==1) { |
467 | Double_t rs=0.5*(fLayers[i+1].GetR() + r); | |
468 | Double_t d=0.011; if (i==3) d=0.0053; | |
469 | if (!fTrackToFollow.PropagateTo(rs,d)) { | |
470 | //cerr<<"AliITStrackerV2::FollowProlongation: " | |
471 | //"propagation failed !\n"; | |
472 | break; | |
473 | } | |
006b5f7f | 474 | } |
475 | ||
476 | //find intersection | |
477 | Double_t x,y,z; | |
14825d5a | 478 | if (!fTrackToFollow.GetGlobalXYZat(r,x,y,z)) { |
7f6ddf58 | 479 | //cerr<<"AliITStrackerV2::FollowProlongation: " |
480 | //"failed to estimate track !\n"; | |
a9a2d814 | 481 | break; |
006b5f7f | 482 | } |
483 | Double_t phi=TMath::ATan2(y,x); | |
006b5f7f | 484 | Int_t idet=layer.FindDetectorIndex(phi,z); |
485 | if (idet<0) { | |
7f6ddf58 | 486 | //cerr<<"AliITStrackerV2::FollowProlongation: " |
487 | //"failed to find a detector !\n"; | |
006b5f7f | 488 | break; |
489 | } | |
490 | ||
491 | //propagate to the intersection | |
492 | const AliITSdetector &det=layer.GetDetector(idet); | |
14825d5a | 493 | phi=det.GetPhi(); |
a9a2d814 | 494 | if (!fTrackToFollow.Propagate(phi,det.GetR())) { |
7f6ddf58 | 495 | //cerr<<"AliITStrackerV2::FollowProlongation: propagation failed !\n"; |
006b5f7f | 496 | break; |
497 | } | |
498 | fTrackToFollow.SetDetectorIndex(idet); | |
499 | ||
500 | //Select possible prolongations and store the current track estimation | |
501 | track.~AliITStrackV2(); new(&track) AliITStrackV2(fTrackToFollow); | |
a9a2d814 | 502 | Double_t dz=3*TMath::Sqrt(track.GetSigmaZ2() + kSigmaZ2[i]); |
14825d5a | 503 | if (dz < 0.5*TMath::Abs(track.GetTgl())) dz=0.5*TMath::Abs(track.GetTgl()); |
7f6ddf58 | 504 | if (dz > kMaxRoad) { |
006b5f7f | 505 | //cerr<<"AliITStrackerV2::FollowProlongation: too broad road in Z !\n"; |
506 | break; | |
507 | } | |
a9a2d814 | 508 | |
509 | if (TMath::Abs(fTrackToFollow.GetZ()-GetZ()) > r+dz) break; | |
510 | ||
511 | Double_t dy=4*TMath::Sqrt(track.GetSigmaY2() + kSigmaY2[i]); | |
14825d5a | 512 | if (dy < 0.5*TMath::Abs(track.GetSnp())) dy=0.5*TMath::Abs(track.GetSnp()); |
7f6ddf58 | 513 | if (dy > kMaxRoad) { |
006b5f7f | 514 | //cerr<<"AliITStrackerV2::FollowProlongation: too broad road in Y !\n"; |
515 | break; | |
516 | } | |
a9a2d814 | 517 | |
7f6ddf58 | 518 | Double_t zmin=track.GetZ() - dz; |
006b5f7f | 519 | Double_t zmax=track.GetZ() + dz; |
14825d5a | 520 | Double_t ymin=track.GetY() + r*phi - dy; |
521 | Double_t ymax=track.GetY() + r*phi + dy; | |
a9a2d814 | 522 | layer.SelectClusters(zmin,zmax,ymin,ymax); |
523 | fI--; | |
006b5f7f | 524 | |
006b5f7f | 525 | //take another prolongation |
526 | if (!TakeNextProlongation()) if (!tryAgain--) break; | |
527 | tryAgain=kLayersToSkip; | |
528 | ||
529 | } | |
530 | ||
531 | //deal with the best track | |
532 | Int_t ncl=fTrackToFollow.GetNumberOfClusters(); | |
533 | Int_t nclb=fBestTrack.GetNumberOfClusters(); | |
534 | if (ncl) | |
535 | if (ncl >= nclb) { | |
536 | Double_t chi2=fTrackToFollow.GetChi2(); | |
537 | if (chi2/ncl < kChi2PerCluster) { | |
538 | if (ncl > nclb || chi2 < fBestTrack.GetChi2()) { | |
539 | ResetBestTrack(); | |
540 | } | |
541 | } | |
542 | } | |
543 | ||
006b5f7f | 544 | } |
545 | ||
006b5f7f | 546 | Int_t AliITStrackerV2::TakeNextProlongation() { |
547 | //-------------------------------------------------------------------- | |
a9a2d814 | 548 | // This function takes another track prolongation |
549 | // | |
550 | // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch | |
006b5f7f | 551 | //-------------------------------------------------------------------- |
006b5f7f | 552 | AliITSlayer &layer=fLayers[fI]; |
4ab260d6 | 553 | ResetTrackToFollow(fTracks[fI]); |
006b5f7f | 554 | |
4ab260d6 | 555 | Double_t dz=4*TMath::Sqrt(fTrackToFollow.GetSigmaZ2() + kSigmaZ2[fI]); |
556 | Double_t dy=4*TMath::Sqrt(fTrackToFollow.GetSigmaY2() + kSigmaY2[fI]); | |
006b5f7f | 557 | |
558 | const AliITSclusterV2 *c=0; Int_t ci=-1; | |
559 | Double_t chi2=12345.; | |
560 | while ((c=layer.GetNextCluster(ci))!=0) { | |
a9a2d814 | 561 | //if (c->GetLabel(0)!=TMath::Abs(lbl)) continue; |
006b5f7f | 562 | Int_t idet=c->GetDetectorIndex(); |
563 | ||
4ab260d6 | 564 | if (fTrackToFollow.GetDetectorIndex()!=idet) { |
006b5f7f | 565 | const AliITSdetector &det=layer.GetDetector(idet); |
4ab260d6 | 566 | ResetTrackToFollow(fTracks[fI]); |
567 | if (!fTrackToFollow.Propagate(det.GetPhi(),det.GetR())) { | |
7f6ddf58 | 568 | //cerr<<"AliITStrackerV2::TakeNextProlongation: " |
569 | //"propagation failed !\n"; | |
006b5f7f | 570 | continue; |
571 | } | |
4ab260d6 | 572 | fTrackToFollow.SetDetectorIndex(idet); |
573 | if (TMath::Abs(fTrackToFollow.GetZ()-GetZ())>layer.GetR()+dz) continue; | |
006b5f7f | 574 | |
575 | #ifdef DEBUG | |
576 | cout<<fI<<" change detector !\n"; | |
577 | #endif | |
578 | ||
579 | } | |
580 | ||
4ab260d6 | 581 | if (TMath::Abs(fTrackToFollow.GetZ() - c->GetZ()) > dz) continue; |
582 | if (TMath::Abs(fTrackToFollow.GetY() - c->GetY()) > dy) continue; | |
006b5f7f | 583 | |
4ab260d6 | 584 | chi2=fTrackToFollow.GetPredictedChi2(c); if (chi2<kMaxChi2) break; |
006b5f7f | 585 | } |
586 | ||
587 | #ifdef DEBUG | |
4ab260d6 | 588 | cout<<fI<<" chi2="<<chi2<<' ' |
589 | <<fTrackToFollow.GetY()<<' '<<fTrackToFollow.GetZ()<<' ' | |
590 | <<dy<<' '<<dz<<endl; | |
006b5f7f | 591 | #endif |
592 | ||
593 | if (chi2>=kMaxChi2) return 0; | |
594 | if (!c) return 0; | |
595 | ||
006b5f7f | 596 | if (!fTrackToFollow.Update(c,chi2,(fI<<28)+ci)) { |
7f6ddf58 | 597 | //cerr<<"AliITStrackerV2::TakeNextProlongation: filtering failed !\n"; |
006b5f7f | 598 | return 0; |
599 | } | |
23efe5f1 | 600 | |
4ab260d6 | 601 | if (fTrackToFollow.GetNumberOfClusters()>1) |
602 | if (TMath::Abs(fTrackToFollow.GetD())>4) return 0; | |
603 | ||
a9a2d814 | 604 | fTrackToFollow. |
605 | SetSampledEdx(c->GetQ(),fTrackToFollow.GetNumberOfClusters()-1); //b.b. | |
606 | ||
607 | { | |
608 | Double_t d=layer.GetThickness(fTrackToFollow.GetY(),fTrackToFollow.GetZ()); | |
609 | fTrackToFollow.CorrectForMaterial(d); | |
610 | } | |
4ab260d6 | 611 | |
a9a2d814 | 612 | if (fConstraint[fPass]) { |
4ab260d6 | 613 | Double_t d=GetEffectiveThickness(0,0); //Think of this !!!! |
614 | fTrackToFollow.Improve(d,GetY(),GetZ()); | |
a9a2d814 | 615 | } |
006b5f7f | 616 | |
617 | #ifdef DEBUG | |
618 | cout<<"accepted lab="<<c->GetLabel(0)<<' ' | |
619 | <<fTrackToFollow.GetNumberOfClusters()<<' ' | |
a9a2d814 | 620 | <<fTrackToFollow.GetY()<<' '<<fTrackToFollow.GetZ()<<' ' |
621 | <<fTrackToFollow.Get1Pt()<<endl<<endl; | |
006b5f7f | 622 | #endif |
623 | ||
624 | return 1; | |
625 | } | |
626 | ||
627 | ||
006b5f7f | 628 | AliITStrackerV2::AliITSlayer::AliITSlayer() { |
629 | //-------------------------------------------------------------------- | |
630 | //default AliITSlayer constructor | |
631 | //-------------------------------------------------------------------- | |
632 | fN=0; | |
633 | fDetectors=0; | |
634 | } | |
635 | ||
636 | AliITStrackerV2::AliITSlayer:: | |
637 | AliITSlayer(Double_t r,Double_t p,Double_t z,Int_t nl,Int_t nd) { | |
638 | //-------------------------------------------------------------------- | |
639 | //main AliITSlayer constructor | |
640 | //-------------------------------------------------------------------- | |
641 | fR=r; fPhiOffset=p; fZOffset=z; | |
642 | fNladders=nl; fNdetectors=nd; | |
643 | fDetectors=new AliITSdetector[fNladders*fNdetectors]; | |
644 | ||
645 | fN=0; | |
646 | fI=0; | |
647 | } | |
648 | ||
649 | AliITStrackerV2::AliITSlayer::~AliITSlayer() { | |
650 | //-------------------------------------------------------------------- | |
651 | // AliITSlayer destructor | |
652 | //-------------------------------------------------------------------- | |
653 | delete[] fDetectors; | |
654 | for (Int_t i=0; i<fN; i++) delete fClusters[i]; | |
655 | } | |
656 | ||
657 | Int_t AliITStrackerV2::AliITSlayer::InsertCluster(AliITSclusterV2 *c) { | |
658 | //-------------------------------------------------------------------- | |
659 | //This function adds a cluster to this layer | |
660 | //-------------------------------------------------------------------- | |
661 | if (fN==kMaxClusterPerLayer) { | |
a9a2d814 | 662 | cerr<<"AliITStrackerV2::AliITSlayer::InsertCluster(): " |
663 | "Too many clusters !\n"; | |
664 | return 1; | |
006b5f7f | 665 | } |
666 | ||
667 | if (fN==0) {fClusters[fN++]=c; return 0;} | |
668 | Int_t i=FindClusterIndex(c->GetZ()); | |
669 | memmove(fClusters+i+1 ,fClusters+i,(fN-i)*sizeof(AliITSclusterV2*)); | |
670 | fClusters[i]=c; fN++; | |
671 | ||
672 | return 0; | |
673 | } | |
674 | ||
675 | Int_t AliITStrackerV2::AliITSlayer::FindClusterIndex(Double_t z) const { | |
676 | //-------------------------------------------------------------------- | |
677 | // This function returns the index of the nearest cluster | |
678 | //-------------------------------------------------------------------- | |
679 | if (fN==0) return 0; | |
680 | if (z <= fClusters[0]->GetZ()) return 0; | |
681 | if (z > fClusters[fN-1]->GetZ()) return fN; | |
682 | Int_t b=0, e=fN-1, m=(b+e)/2; | |
683 | for (; b<e; m=(b+e)/2) { | |
684 | if (z > fClusters[m]->GetZ()) b=m+1; | |
685 | else e=m; | |
686 | } | |
687 | return m; | |
688 | } | |
689 | ||
690 | void AliITStrackerV2::AliITSlayer:: | |
691 | SelectClusters(Double_t zmin,Double_t zmax,Double_t ymin, Double_t ymax) { | |
692 | //-------------------------------------------------------------------- | |
693 | // This function sets the "window" | |
694 | //-------------------------------------------------------------------- | |
695 | fI=FindClusterIndex(zmin); fZmax=zmax; | |
14825d5a | 696 | Double_t circle=2*TMath::Pi()*fR; |
697 | if (ymax>circle) { ymax-=circle; ymin-=circle; } | |
006b5f7f | 698 | fYmin=ymin; fYmax=ymax; |
699 | } | |
700 | ||
701 | const AliITSclusterV2 *AliITStrackerV2::AliITSlayer::GetNextCluster(Int_t &ci){ | |
702 | //-------------------------------------------------------------------- | |
703 | // This function returns clusters within the "window" | |
704 | //-------------------------------------------------------------------- | |
705 | const AliITSclusterV2 *cluster=0; | |
706 | for (Int_t i=fI; i<fN; i++) { | |
707 | const AliITSclusterV2 *c=fClusters[i]; | |
708 | if (c->GetZ() > fZmax) break; | |
709 | if (c->IsUsed()) continue; | |
710 | const AliITSdetector &det=GetDetector(c->GetDetectorIndex()); | |
711 | Double_t y=fR*det.GetPhi() + c->GetY(); | |
712 | ||
713 | if (y>2.*fR*TMath::Pi()) y -= 2*fR*TMath::Pi(); | |
714 | if (y>1.*fR*TMath::Pi() && fYmax<y) y -= 2*fR*TMath::Pi(); | |
715 | ||
716 | if (y<fYmin) continue; | |
717 | if (y>fYmax) continue; | |
718 | cluster=c; ci=i; | |
719 | fI=i+1; | |
720 | break; | |
721 | } | |
7f6ddf58 | 722 | |
006b5f7f | 723 | return cluster; |
724 | } | |
725 | ||
726 | Int_t AliITStrackerV2::AliITSlayer:: | |
727 | FindDetectorIndex(Double_t phi, Double_t z) const { | |
728 | //-------------------------------------------------------------------- | |
729 | //This function finds the detector crossed by the track | |
730 | //-------------------------------------------------------------------- | |
731 | Double_t dphi=phi-fPhiOffset; | |
732 | if (dphi < 0) dphi += 2*TMath::Pi(); | |
733 | else if (dphi >= 2*TMath::Pi()) dphi -= 2*TMath::Pi(); | |
734 | Int_t np=Int_t(dphi*fNladders*0.5/TMath::Pi()+0.5); | |
735 | ||
736 | Double_t dz=fZOffset-z; | |
737 | Int_t nz=Int_t(dz*(fNdetectors-1)*0.5/fZOffset+0.5); | |
738 | ||
739 | if (np>=fNladders) np-=fNladders; | |
740 | if (np<0) np+=fNladders; | |
741 | ||
742 | #ifdef DEBUG | |
743 | cout<<np<<' '<<nz<<endl; | |
744 | #endif | |
745 | ||
746 | return np*fNdetectors + nz; | |
747 | } | |
748 | ||
749 | Double_t | |
a9a2d814 | 750 | AliITStrackerV2::AliITSlayer::GetThickness(Double_t y, Double_t z) const { |
751 | //-------------------------------------------------------------------- | |
752 | //This function returns the layer thickness at this point (units X0) | |
753 | //-------------------------------------------------------------------- | |
754 | Double_t d=0.0085; | |
755 | ||
756 | if (43<fR&&fR<45) { //SSD2 | |
757 | d=0.0036; | |
758 | if (TMath::Abs(y-0.00)>3.40) d+=0.0036; | |
759 | if (TMath::Abs(y-2.50)<0.10) d+=(0.02-0.0036); | |
760 | if (TMath::Abs(y+1.90)<0.10) d+=(0.02-0.0036); | |
761 | for (Int_t i=0; i<12; i++) { | |
762 | if (TMath::Abs(z-3.6*(i+0.5))<0.20) {d+=0.0036; break;} | |
763 | if (TMath::Abs(z+3.6*(i+0.5))<0.20) {d+=0.0036; break;} | |
764 | if (TMath::Abs(z-3.6*(i+0.929))<0.50) {d+=(0.02-0.0036); break;} | |
765 | if (TMath::Abs(z+3.6*(i+0.104))<0.50) {d+=(0.02-0.0036); break;} | |
766 | } | |
767 | } else | |
768 | if (37<fR&&fR<41) { //SSD1 | |
769 | d=0.0036; | |
770 | if (TMath::Abs(y-0.00)>3.40) d+=0.0036; | |
771 | if (TMath::Abs(y-2.20)<0.10) d+=(0.02-0.0036); | |
772 | if (TMath::Abs(y+2.20)<0.10) d+=(0.02-0.0036); | |
773 | for (Int_t i=0; i<11; i++) { | |
774 | if (TMath::Abs(z-3.6*i)<0.20) {d+=0.0036; break;} | |
775 | if (TMath::Abs(z+3.6*i)<0.20) {d+=0.0036; break;} | |
776 | if (TMath::Abs(z-3.6*(i+0.54))<0.50) {d+=(0.02-0.0036); break;} | |
777 | if (TMath::Abs(z+3.6*(i+0.58))<0.50) {d+=(0.02-0.0036); break;} | |
778 | } | |
779 | } else | |
780 | if (13<fR&&fR<26) { //SDD | |
781 | d=0.0034; | |
782 | if (TMath::Abs(y-0.00)>3.30) d+=0.0034; | |
783 | if (TMath::Abs(y-2.10)<0.20) d+=0.0034*3; | |
784 | if (TMath::Abs(y+2.10)<0.20) d+=0.0034*3; | |
785 | for (Int_t i=0; i<4; i++) { | |
786 | if (TMath::Abs(z-7.3*i)<0.60) {d+=0.0034; break;} | |
787 | if (TMath::Abs(z+7.3*i)<0.60) {d+=0.0034; break;} | |
788 | } | |
789 | } else | |
790 | if (6<fR&&fR<8) { //SPD2 | |
791 | d=0.0093; | |
792 | if (TMath::Abs(y-3.08)>0.45) d+=0.0064; | |
793 | if (TMath::Abs(y-3.03)<0.10) d+=0.0192; | |
794 | } else | |
795 | if (3<fR&&fR<5) { //SPD1 | |
796 | d=0.0093; | |
797 | if (TMath::Abs(y+0.21)>0.55) d+=0.0064; | |
798 | if (TMath::Abs(y+0.10)<0.10) d+=0.0192; | |
799 | } | |
800 | ||
801 | d+=0.002; | |
006b5f7f | 802 | |
a9a2d814 | 803 | return d; |
804 | } | |
006b5f7f | 805 | |
a9a2d814 | 806 | Double_t AliITStrackerV2::GetEffectiveThickness(Double_t y,Double_t z) const |
006b5f7f | 807 | { |
808 | //-------------------------------------------------------------------- | |
a9a2d814 | 809 | //Returns the thickness between the current layer and the vertex (units X0) |
006b5f7f | 810 | //-------------------------------------------------------------------- |
a9a2d814 | 811 | Double_t d=0.1/65.19*1.848; |
006b5f7f | 812 | |
813 | Double_t xn=fLayers[fI].GetR(); | |
814 | for (Int_t i=0; i<fI; i++) { | |
815 | Double_t xi=fLayers[i].GetR(); | |
a9a2d814 | 816 | d+=fLayers[i].GetThickness(y,z)*xi*xi; |
006b5f7f | 817 | } |
818 | ||
819 | if (fI>1) { | |
820 | Double_t xi=0.5*(fLayers[1].GetR()+fLayers[2].GetR()); | |
a9a2d814 | 821 | d+=0.011*xi*xi; |
006b5f7f | 822 | } |
823 | ||
824 | if (fI>3) { | |
825 | Double_t xi=0.5*(fLayers[3].GetR()+fLayers[4].GetR()); | |
a9a2d814 | 826 | d+=0.0053*xi*xi; |
006b5f7f | 827 | } |
828 | return d/(xn*xn); | |
829 | } | |
830 | ||
831 | ||
832 | ||
833 | Int_t AliITStrackerV2::AliITSlayer::InRoad() const { | |
834 | //-------------------------------------------------------------------- | |
835 | // This function returns number of clusters within the "window" | |
836 | //-------------------------------------------------------------------- | |
837 | Int_t ncl=0; | |
838 | for (Int_t i=fI; i<fN; i++) { | |
839 | const AliITSclusterV2 *c=fClusters[i]; | |
840 | if (c->GetZ() > fZmax) break; | |
a9a2d814 | 841 | if (c->IsUsed()) continue; |
006b5f7f | 842 | const AliITSdetector &det=GetDetector(c->GetDetectorIndex()); |
843 | Double_t y=fR*det.GetPhi() + c->GetY(); | |
844 | ||
845 | if (y>2.*fR*TMath::Pi()) y -= 2*fR*TMath::Pi(); | |
846 | if (y>1.*fR*TMath::Pi() && fYmax<y) y -= 2*fR*TMath::Pi(); | |
847 | ||
848 | if (y<fYmin) continue; | |
849 | if (y>fYmax) continue; | |
850 | ncl++; | |
851 | } | |
852 | return ncl; | |
853 | } | |
854 | ||
4ab260d6 | 855 | Bool_t AliITStrackerV2::RefitAt(Double_t x, AliITStrackV2 *t, Int_t *index) { |
856 | //-------------------------------------------------------------------- | |
857 | // This function refits a track at a given position | |
858 | //-------------------------------------------------------------------- | |
859 | Int_t from, to, step; | |
860 | if (x > t->GetX()) { | |
861 | from=0; to=kMaxLayer; | |
862 | step=+1; | |
863 | } else { | |
864 | from=kMaxLayer-1; to=-1; | |
865 | step=-1; | |
866 | } | |
867 | ||
868 | for (Int_t i=from; i != to; i += step) { | |
869 | AliITSlayer &layer=fLayers[i]; | |
870 | Double_t r=layer.GetR(); | |
871 | ||
872 | { | |
873 | Double_t hI=i-0.5*step; | |
874 | if (hI==1.5 || hI==3.5) { | |
875 | Double_t rs=0.5*(fLayers[i-step].GetR() + r); | |
876 | Double_t ds=0.011; if (hI==3.5) ds=0.0053; | |
877 | if (!t->PropagateTo(rs,ds)) { | |
878 | return kFALSE; | |
879 | } | |
880 | } | |
881 | } | |
882 | ||
883 | Double_t x,y,z; | |
884 | if (!t->GetGlobalXYZat(r,x,y,z)) { | |
885 | return kFALSE; | |
886 | } | |
887 | Double_t phi=TMath::ATan2(y,x); | |
888 | Int_t idet=layer.FindDetectorIndex(phi,z); | |
889 | if (idet<0) { | |
890 | return kFALSE; | |
891 | } | |
892 | const AliITSdetector &det=layer.GetDetector(idet); | |
893 | phi=det.GetPhi(); | |
894 | if (!t->Propagate(phi,det.GetR())) { | |
895 | return kFALSE; | |
896 | } | |
897 | t->SetDetectorIndex(idet); | |
898 | ||
899 | const AliITSclusterV2 *cl=0; | |
900 | Double_t maxchi2=kMaxChi2; | |
901 | ||
902 | Int_t idx=index[i]; | |
903 | if (idx>0) { | |
904 | const AliITSclusterV2 *c=(AliITSclusterV2 *)GetCluster(idx); | |
905 | if (idet != c->GetDetectorIndex()) { | |
906 | idet=c->GetDetectorIndex(); | |
907 | const AliITSdetector &det=layer.GetDetector(idet); | |
908 | if (!t->Propagate(det.GetPhi(),det.GetR())) { | |
909 | return kFALSE; | |
910 | } | |
911 | t->SetDetectorIndex(idet); | |
912 | } | |
913 | Double_t chi2=t->GetPredictedChi2(c); | |
914 | if (chi2<maxchi2) { cl=c; maxchi2=chi2; } | |
915 | else return kFALSE; | |
916 | } | |
917 | ||
918 | /* | |
919 | if (cl==0) | |
920 | if (t->GetNumberOfClusters()>2) { | |
921 | Double_t dz=4*TMath::Sqrt(t->GetSigmaZ2()+kSigmaZ2[i]); | |
922 | Double_t dy=4*TMath::Sqrt(t->GetSigmaY2()+kSigmaY2[i]); | |
923 | Double_t zmin=t->GetZ() - dz; | |
924 | Double_t zmax=t->GetZ() + dz; | |
925 | Double_t ymin=t->GetY() + phi*r - dy; | |
926 | Double_t ymax=t->GetY() + phi*r + dy; | |
927 | layer.SelectClusters(zmin,zmax,ymin,ymax); | |
928 | ||
929 | const AliITSclusterV2 *c=0; Int_t ci=-1; | |
930 | while ((c=layer.GetNextCluster(ci))!=0) { | |
931 | if (idet != c->GetDetectorIndex()) continue; | |
932 | Double_t chi2=t->GetPredictedChi2(c); | |
933 | if (chi2<maxchi2) { cl=c; maxchi2=chi2; idx=ci; } | |
934 | } | |
935 | } | |
936 | */ | |
937 | ||
938 | if (cl) { | |
939 | if (!t->Update(cl,maxchi2,idx)) { | |
940 | return kFALSE; | |
941 | } | |
942 | } | |
943 | ||
944 | { | |
945 | Double_t d=layer.GetThickness(t->GetY(),t->GetZ()); | |
946 | t->CorrectForMaterial(-step*d); | |
947 | } | |
948 | ||
949 | } | |
950 | ||
951 | if (!t->PropagateTo(x,0.,0.)) return kFALSE; | |
952 | return kTRUE; | |
953 | } | |
954 | ||
006b5f7f | 955 | |
956 |