Possibility to stop tracking at a given layer (default is 1). Added new method AliITS...
[u/mrichter/AliRoot.git] / ITS / AliITStrackerV2.cxx
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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//-------------------------------------------------------------------------
1f9a65c4 22
006b5f7f 23#include <TFile.h>
24#include <TTree.h>
25#include <TRandom.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
8676d691 33ClassImp(AliITStrackerV2)
006b5f7f 34
006b5f7f 35AliITStrackerV2::AliITSlayer AliITStrackerV2::fLayers[kMaxLayer]; // ITS layers
36
61ab8ea8 37AliITStrackerV2::AliITStrackerV2(const AliITSgeom *geom) : AliTracker() {
006b5f7f 38 //--------------------------------------------------------------------
61ab8ea8 39 //This is the AliITStrackerV2 constructor
006b5f7f 40 //--------------------------------------------------------------------
006b5f7f 41 AliITSgeom *g=(AliITSgeom*)geom;
42
43 Float_t x,y,z;
44 Int_t i;
45 for (i=1; i<kMaxLayer+1; i++) {
46 Int_t nlad=g->GetNladders(i);
47 Int_t ndet=g->GetNdetectors(i);
48
49 g->GetTrans(i,1,1,x,y,z);
50 Double_t r=TMath::Sqrt(x*x + y*y);
51 Double_t poff=TMath::ATan2(y,x);
52 Double_t zoff=z;
53
54 g->GetTrans(i,1,2,x,y,z);
55 r += TMath::Sqrt(x*x + y*y);
56 g->GetTrans(i,2,1,x,y,z);
57 r += TMath::Sqrt(x*x + y*y);
58 g->GetTrans(i,2,2,x,y,z);
59 r += TMath::Sqrt(x*x + y*y);
60 r*=0.25;
61
62 new (fLayers+i-1) AliITSlayer(r,poff,zoff,nlad,ndet);
63
64 for (Int_t j=1; j<nlad+1; j++) {
65 for (Int_t k=1; k<ndet+1; k++) { //Fill this layer with detectors
66 Float_t x,y,zshift; g->GetTrans(i,j,k,x,y,zshift);
67 Double_t rot[9]; g->GetRotMatrix(i,j,k,rot);
68
69 Double_t r =-x*rot[1] + y*rot[0]; if (i==1) r=-r;
70 Double_t phi=TMath::ATan2(rot[1],rot[0]); if (i==1) phi-=3.1415927;
61ab8ea8 71 phi+=0.5*TMath::Pi(); if (phi<0) phi += 2*TMath::Pi();
006b5f7f 72 AliITSdetector &det=fLayers[i-1].GetDetector((j-1)*ndet + k-1);
73
006b5f7f 74 new(&det) AliITSdetector(r,phi);
75 }
76 }
77
78 }
79
61ab8ea8 80 fI=kMaxLayer;
743a19f2 81
61ab8ea8 82 fPass=0;
83 fConstraint[0]=1; fConstraint[1]=0;
8676d691 84
85 Double_t xyz[]={kXV,kYV,kZV}, ers[]={kSigmaXV,kSigmaYV,kSigmaZV};
86 SetVertex(xyz,ers);
c0dd5278 87
88 for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=kLayersNotToSkip[i];
89 fLastLayerToTrackTo=kLastLayerToTrackTo;
90
91}
92
93void AliITStrackerV2::SetLayersNotToSkip(Int_t *l) {
94 //--------------------------------------------------------------------
95 //This function set masks of the layers which must be not skipped
96 //--------------------------------------------------------------------
97 for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=l[i];
61ab8ea8 98}
006b5f7f 99
8676d691 100Int_t AliITStrackerV2::LoadClusters() {
61ab8ea8 101 //--------------------------------------------------------------------
102 //This function loads ITS clusters
103 //--------------------------------------------------------------------
104 char cname[100];
105 sprintf(cname,"TreeC_ITS_%d",GetEventNumber());
106 TTree *cTree=(TTree*)gDirectory->Get(cname);
107 if (!cTree) {
8676d691 108 Error("LoadClusters"," can't get cTree !\n");
109 return 1;
61ab8ea8 110 }
111 TBranch *branch=cTree->GetBranch("Clusters");
112 if (!branch) {
8676d691 113 Error("LoadClusters"," can't get Clusters branch !\n");
114 return 1;
61ab8ea8 115 }
006b5f7f 116
61ab8ea8 117 TClonesArray dummy("AliITSclusterV2",10000), *clusters=&dummy;
118 branch->SetAddress(&clusters);
006b5f7f 119
61ab8ea8 120 Int_t j=0;
121 for (Int_t i=0; i<kMaxLayer; i++) {
b87bd7cd 122 Int_t ndet=fLayers[i].GetNdetectors();
123 Int_t jmax = j + fLayers[i].GetNladders()*ndet;
61ab8ea8 124 for (; j<jmax; j++) {
125 if (!cTree->GetEvent(j)) continue;
126 Int_t ncl=clusters->GetEntriesFast();
127 while (ncl--) {
128 AliITSclusterV2 *c=(AliITSclusterV2*)clusters->UncheckedAt(ncl);
61ab8ea8 129 fLayers[i].InsertCluster(new AliITSclusterV2(*c));
130 }
131 clusters->Delete();
132 }
b87bd7cd 133 fLayers[i].ResetRoad(); //road defined by the cluster density
006b5f7f 134 }
61ab8ea8 135 delete cTree; //Thanks to Mariana Bondila
8676d691 136
137 return 0;
61ab8ea8 138}
006b5f7f 139
61ab8ea8 140void AliITStrackerV2::UnloadClusters() {
141 //--------------------------------------------------------------------
142 //This function unloads ITS clusters
143 //--------------------------------------------------------------------
144 for (Int_t i=0; i<kMaxLayer; i++) fLayers[i].ResetClusters();
006b5f7f 145}
146
880f41b9 147static Int_t CorrectForDeadZoneMaterial(AliITStrackV2 *t) {
148 //--------------------------------------------------------------------
149 // Correction for the material between the TPC and the ITS
150 // (should it belong to the TPC code ?)
151 //--------------------------------------------------------------------
152 Double_t riw=80., diw=0.0053, x0iw=30; // TPC inner wall ?
153 Double_t rcd=61., dcd=0.0053, x0cd=30; // TPC "central drum" ?
154 Double_t yr=12.8, dr=0.03; // rods ?
155 Double_t zm=0.2, dm=0.40; // membrane
156 //Double_t rr=52., dr=0.19, x0r=24., yyr=7.77; //rails
157 Double_t rs=50., ds=0.001; // something belonging to the ITS (screen ?)
158
159 if (t->GetX() > riw) {
160 if (!t->PropagateTo(riw,diw,x0iw)) return 1;
161 if (TMath::Abs(t->GetY())>yr) t->CorrectForMaterial(dr);
162 if (TMath::Abs(t->GetZ())<zm) t->CorrectForMaterial(dm);
163 if (!t->PropagateTo(rcd,dcd,x0cd)) return 1;
164 //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z);
165 //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,dr,x0r);
166 if (!t->PropagateTo(rs,ds)) return 1;
167 } else if (t->GetX() < rs) {
168 if (!t->PropagateTo(rs,-ds)) return 1;
169 //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z);
170 //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,-dr,x0r);
171 if (!t->PropagateTo(rcd,-dcd,x0cd)) return 1;
172 if (!t->PropagateTo(riw,-diw,x0iw)) return 1;
173 } else {
174 ::Error("CorrectForDeadZoneMaterial","track is already in the dead zone !");
175 return 1;
176 }
177
178 return 0;
179}
180
006b5f7f 181Int_t AliITStrackerV2::Clusters2Tracks(const TFile *inp, TFile *out) {
182 //--------------------------------------------------------------------
183 //This functions reconstructs ITS tracks
184 //--------------------------------------------------------------------
185 TFile *in=(TFile*)inp;
186 TDirectory *savedir=gDirectory;
187
8676d691 188 if (LoadClusters()!=0) return 1;
61ab8ea8 189
006b5f7f 190 if (!in->IsOpen()) {
8676d691 191 Error("Clusters2Tracks","file with TPC tracks is not open !\n");
192 return 1;
006b5f7f 193 }
194
195 if (!out->IsOpen()) {
8676d691 196 Error("Clusters2Tracks","file for ITS tracks is not open !\n");
197 return 2;
006b5f7f 198 }
199
7f6ddf58 200 in->cd();
201
61ab8ea8 202 Char_t tname[100];
a7554aa9 203 Int_t nentr=0; TObjArray itsTracks(15000);
7f6ddf58 204
205 {/* Read TPC tracks */
61ab8ea8 206 sprintf(tname,"TreeT_TPC_%d",GetEventNumber());
7f6ddf58 207 TTree *tpcTree=(TTree*)in->Get(tname);
208 if (!tpcTree) {
8676d691 209 Error("Clusters2Tracks","can't get a tree with TPC tracks !\n");
210 return 3;
7f6ddf58 211 }
212 AliTPCtrack *itrack=new AliTPCtrack;
213 tpcTree->SetBranchAddress("tracks",&itrack);
214 nentr=(Int_t)tpcTree->GetEntries();
880f41b9 215
216 Info("Clusters2Tracks","Number of TPC tracks: %d\n",nentr);
217
7f6ddf58 218 for (Int_t i=0; i<nentr; i++) {
219 tpcTree->GetEvent(i);
4ab260d6 220 AliITStrackV2 *t=0;
221 try {
222 t=new AliITStrackV2(*itrack);
223 } catch (const Char_t *msg) {
8676d691 224 Warning("Clusters2Tracks",msg);
4ab260d6 225 delete t;
226 continue;
227 }
a9a2d814 228 if (TMath::Abs(t->GetD())>4) continue;
229
880f41b9 230 if (CorrectForDeadZoneMaterial(t)!=0) {
231 Warning("Clusters2Tracks",
232 "failed to correct for the material in the dead zone !\n");
233 continue;
234 }
a9a2d814 235
236 itsTracks.AddLast(t);
7f6ddf58 237 }
238 delete tpcTree; //Thanks to Mariana Bondila
239 delete itrack;
006b5f7f 240 }
7f6ddf58 241 itsTracks.Sort();
880f41b9 242 nentr=itsTracks.GetEntriesFast();
006b5f7f 243
244 out->cd();
7f6ddf58 245
61ab8ea8 246 sprintf(tname,"TreeT_ITS_%d",GetEventNumber());
7f6ddf58 247 TTree itsTree(tname,"Tree with ITS tracks");
006b5f7f 248 AliITStrackV2 *otrack=&fBestTrack;
249 itsTree.Branch("tracks","AliITStrackV2",&otrack,32000,0);
250
7f6ddf58 251 for (fPass=0; fPass<2; fPass++) {
252 Int_t &constraint=fConstraint[fPass]; if (constraint<0) continue;
253 for (Int_t i=0; i<nentr; i++) {
7f6ddf58 254 AliITStrackV2 *t=(AliITStrackV2*)itsTracks.UncheckedAt(i);
255 if (t==0) continue; //this track has been already tracked
256 Int_t tpcLabel=t->GetLabel(); //save the TPC track label
a9a2d814 257
4ab260d6 258 ResetTrackToFollow(*t);
7f6ddf58 259 ResetBestTrack();
006b5f7f 260
7f6ddf58 261 for (FollowProlongation(); fI<kMaxLayer; fI++) {
262 while (TakeNextProlongation()) FollowProlongation();
263 }
006b5f7f 264
c0dd5278 265 if (fBestTrack.GetNumberOfClusters() == 0) continue;
8676d691 266
267 if (fConstraint[fPass]) {
880f41b9 268 if (!RefitAt(3.7, t, &fBestTrack)) continue;
8676d691 269 }
4ab260d6 270
8676d691 271 fBestTrack.SetLabel(tpcLabel);
272 fBestTrack.CookdEdx();
273 CookLabel(&fBestTrack,0.); //For comparison only
274 itsTree.Fill();
275 UseClusters(&fBestTrack);
276 delete itsTracks.RemoveAt(i);
7f6ddf58 277 }
006b5f7f 278 }
006b5f7f 279
880f41b9 280 nentr=(Int_t)itsTree.GetEntries();
281 Info("Clusters2Tracks","Number of prolonged tracks: %d\n",nentr);
8676d691 282
7f6ddf58 283 itsTree.Write();
c7ee21ca 284
7f6ddf58 285 itsTracks.Delete();
61ab8ea8 286
287 UnloadClusters();
288
7f6ddf58 289 savedir->cd();
006b5f7f 290 return 0;
291}
292
14825d5a 293Int_t AliITStrackerV2::PropagateBack(const TFile *inp, TFile *out) {
294 //--------------------------------------------------------------------
295 //This functions propagates reconstructed ITS tracks back
296 //--------------------------------------------------------------------
297 TFile *in=(TFile*)inp;
298 TDirectory *savedir=gDirectory;
299
8676d691 300 if (LoadClusters()!=0) return 1;
61ab8ea8 301
14825d5a 302 if (!in->IsOpen()) {
8676d691 303 Error("PropagateBack","file with ITS tracks is not open !\n");
304 return 1;
14825d5a 305 }
306
307 if (!out->IsOpen()) {
8676d691 308 Error("PropagateBack","file for back propagated ITS tracks is not open !\n");
309 return 2;
14825d5a 310 }
311
312 in->cd();
61ab8ea8 313
314 Char_t tname[100];
315 sprintf(tname,"TreeT_ITS_%d",GetEventNumber());
316 TTree *itsTree=(TTree*)in->Get(tname);
14825d5a 317 if (!itsTree) {
8676d691 318 Error("PropagateBack","can't get a tree with ITS tracks !\n");
319 return 3;
14825d5a 320 }
321 AliITStrackV2 *itrack=new AliITStrackV2;
322 itsTree->SetBranchAddress("tracks",&itrack);
323
324 out->cd();
61ab8ea8 325
326 sprintf(tname,"TreeT_ITSb_%d",GetEventNumber());
327 TTree backTree(tname,"Tree with back propagated ITS tracks");
14825d5a 328 AliTPCtrack *otrack=0;
f29dbb4b 329 backTree.Branch("tracks","AliTPCtrack",&otrack,32000,2);
14825d5a 330
14825d5a 331 Int_t nentr=(Int_t)itsTree->GetEntries();
880f41b9 332 Int_t i;
333 for (i=0; i<nentr; i++) {
14825d5a 334 itsTree->GetEvent(i);
880f41b9 335 Int_t itsLabel=itrack->GetLabel(); //save the ITS track label
14825d5a 336 ResetTrackToFollow(*itrack);
f29dbb4b 337
338 // propagete to vertex [SR, GSI 17.02.2003]
339 fTrackToFollow.PropagateTo(3.,0.0028,65.19);
340 fTrackToFollow.PropagateToVertex();
341
342 // Start Time measurement [SR, GSI 17.02.2003]
343 fTrackToFollow.StartTimeIntegral();
344 fTrackToFollow.PropagateTo(3.,-0.0028,65.19);
345 //
346
880f41b9 347 itrack->ResetCovariance(); itrack->ResetClusters();
348 if (!RefitAt(49.,itrack,&fTrackToFollow)) continue;
f29dbb4b 349
880f41b9 350 if (CorrectForDeadZoneMaterial(&fTrackToFollow)!=0) {
351 Warning("PropagateBack",
352 "failed to correct for the material in the dead zone !\n");
353 continue;
354 }
355
356 fTrackToFollow.SetLabel(itsLabel);
357 otrack=new AliTPCtrack(fTrackToFollow,fTrackToFollow.GetAlpha());
358 backTree.Fill(); delete otrack;
359 UseClusters(&fTrackToFollow);
360 }
361 i=(Int_t)backTree.GetEntries();
362 backTree.Write();
14825d5a 363
880f41b9 364 Info("PropagateBack","Number of ITS tracks: %d\n",nentr);
365 Info("PropagateBack","Number of back propagated ITS tracks: %d\n",i);
f29dbb4b 366
880f41b9 367 delete itrack;
368 delete itsTree; //Thanks to Mariana Bondila
369
370 UnloadClusters();
371
372 savedir->cd();
373
374 return 0;
375}
376
377Int_t AliITStrackerV2::RefitInward(const TFile *inp, TFile *out) {
378 //--------------------------------------------------------------------
379 // This functions refits ITS tracks using the
380 // "inward propagated" TPC tracks
381 //--------------------------------------------------------------------
382 TFile *in=(TFile*)inp;
383 TDirectory *savedir=gDirectory;
14825d5a 384
880f41b9 385 if (LoadClusters()!=0) return 1;
386
387 if (!in->IsOpen()) {
388 Error("RefitInward","file with inward TPC tracks is not open !\n");
389 return 2;
390 }
391
392 if (!out->IsOpen()) {
393 Error("RefitInward","file for inward ITS tracks is not open !\n");
394 return 3;
395 }
396
397 Int_t i;
398
399 //LUT used for the track matching (S.Radomski's idea)
400 const Int_t nLab = 400000; // limit on the number of track labels
401 Int_t lut[nLab];
402 for(i=0; i<nLab; i++) lut[i] = -1;
403
404 Char_t tname[100];
405
406 TObjArray itsTracks(15000);
407 {/* Read the ITS tracks */
408 sprintf(tname,"TreeT_ITS_%d",GetEventNumber());
409 TTree *itsTree=(TTree*)out->Get(tname);
410 if (!itsTree) {
411 Error("RefitInward","can't get a tree with ITS tracks !\n");
412 return 3;
14825d5a 413 }
880f41b9 414 AliITStrackV2 *itrack=new AliITStrackV2;
415 itsTree->SetBranchAddress("tracks",&itrack);
416 Int_t nits=(Int_t)itsTree->GetEntries();
417
418 Info("RefitInward","Number of ITS tracks: %d\n",nits);
419
420 for (Int_t i=0; i<nits; i++) {
421 itsTree->GetEvent(i);
422 Int_t lab=TMath::Abs(itrack->GetLabel());
423 if (lab < nLab) {
424 if (lut[lab]>=0) Warning("RefitInward","double track %d\n",lab);
425 lut[lab]=i;
426 } else {
427 Warning("RefitInward","Too big ITS track label: %d\n!",lab);
428 continue;
429 }
430 itsTracks.AddLast(new AliITStrackV2(*itrack));
14825d5a 431 }
880f41b9 432 delete itsTree;
433 delete itrack;
14825d5a 434 }
435
880f41b9 436 out->cd();
437
438 //Create the output tree
439 sprintf(tname,"TreeT_ITSinward_%d",GetEventNumber());
440 TTree outTree(tname,"Tree with inward refitted ITS tracks");
441 AliITStrackV2 *otrack=0;
442 outTree.Branch("tracks","AliITStrackV2",&otrack,32000,0);
443
444 //Get the input tree
445 sprintf(tname,"tracksTPC_%d",GetEventNumber());
446 TTree *tpcTree=(TTree*)in->Get(tname);
447 if (!tpcTree) {
448 Error("RefitInward","can't get a tree with TPC tracks !\n");
449 return 3;
450 }
451 AliTPCtrack *itrack=new AliTPCtrack;
452 tpcTree->SetBranchAddress("tracks",&itrack);
453 Int_t ntpc=(Int_t)tpcTree->GetEntries();
61ab8ea8 454
880f41b9 455 Info("RefitInward","Number of TPC tracks: %d\n",ntpc);
14825d5a 456
880f41b9 457 for (i=0; i<ntpc; i++) {
458 tpcTree->GetEvent(i);
459 AliITStrackV2 *t=0;
460 try {
461 t=new AliITStrackV2(*itrack);
462 } catch (const Char_t *msg) {
463 Warning("RefitInward",msg);
464 delete t;
465 continue;
466 }
467 //check if this track was reconstructed in the ITS
468 Int_t lab=TMath::Abs(t->GetLabel());
469 if (lab >= nLab) {
470 Warning("RefitInward","Too big TPC track label: %d\n!",lab);
471 continue;
472 }
473 Int_t idx=lut[lab];
474 if (idx<0) continue; //no prolongation in the ITS for this track
475
476 if (CorrectForDeadZoneMaterial(t)!=0) {
477 Warning("RefitInward",
478 "failed to correct for the material in the dead zone !\n");
479 continue;
480 }
14825d5a 481
880f41b9 482 //Refitting...
483 otrack=(AliITStrackV2*)itsTracks.UncheckedAt(idx);
484 if (!RefitAt(3.7, t, otrack)) continue;
485 otrack->SetLabel(itrack->GetLabel()); //For comparison only
486 otrack->CookdEdx();
487 CookLabel(otrack,0.); //For comparison only
488 outTree.Fill();
489 delete t;
490 }
491 i=(Int_t)outTree.GetEntries();
492 Info("RefitInward","Number of inward refitted ITS tracks: %d\n",i);
493 outTree.Write();
c7ee21ca 494
880f41b9 495 delete tpcTree;
496 delete itrack;
497 itsTracks.Delete();
61ab8ea8 498
499 savedir->cd();
500
14825d5a 501 return 0;
502}
006b5f7f 503
504AliCluster *AliITStrackerV2::GetCluster(Int_t index) const {
505 //--------------------------------------------------------------------
506 // Return pointer to a given cluster
507 //--------------------------------------------------------------------
508 Int_t l=(index & 0xf0000000) >> 28;
509 Int_t c=(index & 0x0fffffff) >> 00;
510 return fLayers[l].GetCluster(c);
511}
512
513
514void AliITStrackerV2::FollowProlongation() {
515 //--------------------------------------------------------------------
516 //This function finds a track prolongation
517 //--------------------------------------------------------------------
c0dd5278 518 while (fI>fLastLayerToTrackTo) {
a9a2d814 519 Int_t i=fI-1;
8676d691 520
a9a2d814 521 AliITSlayer &layer=fLayers[i];
522 AliITStrackV2 &track=fTracks[i];
006b5f7f 523
14825d5a 524 Double_t r=layer.GetR();
61ab8ea8 525
a9a2d814 526 if (i==3 || i==1) {
527 Double_t rs=0.5*(fLayers[i+1].GetR() + r);
61ab8ea8 528 Double_t d=0.0034, x0=38.6;
529 if (i==1) {rs=9.; d=0.0097; x0=42;}
530 if (!fTrackToFollow.PropagateTo(rs,d,x0)) {
8676d691 531 //Warning("FollowProlongation","propagation failed !\n");
c0dd5278 532 return;
a9a2d814 533 }
006b5f7f 534 }
535
536 //find intersection
537 Double_t x,y,z;
14825d5a 538 if (!fTrackToFollow.GetGlobalXYZat(r,x,y,z)) {
8676d691 539 //Warning("FollowProlongation","failed to estimate track !\n");
c0dd5278 540 return;
006b5f7f 541 }
542 Double_t phi=TMath::ATan2(y,x);
006b5f7f 543 Int_t idet=layer.FindDetectorIndex(phi,z);
544 if (idet<0) {
8676d691 545 //Warning("FollowProlongation","failed to find a detector !\n");
c0dd5278 546 return;
006b5f7f 547 }
548
549 //propagate to the intersection
550 const AliITSdetector &det=layer.GetDetector(idet);
14825d5a 551 phi=det.GetPhi();
a9a2d814 552 if (!fTrackToFollow.Propagate(phi,det.GetR())) {
8676d691 553 //Warning("FollowProlongation","propagation failed !\n");
c0dd5278 554 return;
006b5f7f 555 }
556 fTrackToFollow.SetDetectorIndex(idet);
557
558 //Select possible prolongations and store the current track estimation
559 track.~AliITStrackV2(); new(&track) AliITStrackV2(fTrackToFollow);
8676d691 560 Double_t dz=7*TMath::Sqrt(track.GetSigmaZ2() + kSigmaZ2[i]);
561 Double_t dy=7*TMath::Sqrt(track.GetSigmaY2() + kSigmaY2[i]);
562 Double_t road=layer.GetRoad();
563 if (dz*dy>road*road) {
564 Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd;
565 dz=road*scz; dy=road*scy;
566 }
b87bd7cd 567
568 //Double_t dz=4*TMath::Sqrt(track.GetSigmaZ2() + kSigmaZ2[i]);
14825d5a 569 if (dz < 0.5*TMath::Abs(track.GetTgl())) dz=0.5*TMath::Abs(track.GetTgl());
7f6ddf58 570 if (dz > kMaxRoad) {
8676d691 571 //Warning("FollowProlongation","too broad road in Z !\n");
c0dd5278 572 return;
006b5f7f 573 }
a9a2d814 574
c0dd5278 575 if (TMath::Abs(fTrackToFollow.GetZ()-GetZ()) > r+dz) return;
a9a2d814 576
b87bd7cd 577 //Double_t dy=4*TMath::Sqrt(track.GetSigmaY2() + kSigmaY2[i]);
14825d5a 578 if (dy < 0.5*TMath::Abs(track.GetSnp())) dy=0.5*TMath::Abs(track.GetSnp());
7f6ddf58 579 if (dy > kMaxRoad) {
8676d691 580 //Warning("FollowProlongation","too broad road in Y !\n");
c0dd5278 581 return;
006b5f7f 582 }
a9a2d814 583
7f6ddf58 584 Double_t zmin=track.GetZ() - dz;
006b5f7f 585 Double_t zmax=track.GetZ() + dz;
14825d5a 586 Double_t ymin=track.GetY() + r*phi - dy;
587 Double_t ymax=track.GetY() + r*phi + dy;
a9a2d814 588 layer.SelectClusters(zmin,zmax,ymin,ymax);
589 fI--;
006b5f7f 590
006b5f7f 591 //take another prolongation
c0dd5278 592 if (!TakeNextProlongation())
593 if (fLayersNotToSkip[fI]) return;
006b5f7f 594
595 }
596
597 //deal with the best track
598 Int_t ncl=fTrackToFollow.GetNumberOfClusters();
599 Int_t nclb=fBestTrack.GetNumberOfClusters();
600 if (ncl)
601 if (ncl >= nclb) {
602 Double_t chi2=fTrackToFollow.GetChi2();
603 if (chi2/ncl < kChi2PerCluster) {
604 if (ncl > nclb || chi2 < fBestTrack.GetChi2()) {
605 ResetBestTrack();
606 }
607 }
608 }
609
006b5f7f 610}
611
006b5f7f 612Int_t AliITStrackerV2::TakeNextProlongation() {
613 //--------------------------------------------------------------------
a9a2d814 614 // This function takes another track prolongation
615 //
616 // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch
006b5f7f 617 //--------------------------------------------------------------------
006b5f7f 618 AliITSlayer &layer=fLayers[fI];
4ab260d6 619 ResetTrackToFollow(fTracks[fI]);
006b5f7f 620
b87bd7cd 621 Double_t dz=7*TMath::Sqrt(fTrackToFollow.GetSigmaZ2() + kSigmaZ2[fI]);
622 Double_t dy=7*TMath::Sqrt(fTrackToFollow.GetSigmaY2() + kSigmaY2[fI]);
8676d691 623 Double_t road=layer.GetRoad();
624 if (dz*dy>road*road) {
625 Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd;
626 dz=road*scz; dy=road*scy;
627 }
006b5f7f 628
629 const AliITSclusterV2 *c=0; Int_t ci=-1;
630 Double_t chi2=12345.;
631 while ((c=layer.GetNextCluster(ci))!=0) {
006b5f7f 632 Int_t idet=c->GetDetectorIndex();
633
4ab260d6 634 if (fTrackToFollow.GetDetectorIndex()!=idet) {
006b5f7f 635 const AliITSdetector &det=layer.GetDetector(idet);
4ab260d6 636 ResetTrackToFollow(fTracks[fI]);
637 if (!fTrackToFollow.Propagate(det.GetPhi(),det.GetR())) {
8676d691 638 //Warning("TakeNextProlongation","propagation failed !\n");
006b5f7f 639 continue;
640 }
4ab260d6 641 fTrackToFollow.SetDetectorIndex(idet);
642 if (TMath::Abs(fTrackToFollow.GetZ()-GetZ())>layer.GetR()+dz) continue;
006b5f7f 643 }
644
4ab260d6 645 if (TMath::Abs(fTrackToFollow.GetZ() - c->GetZ()) > dz) continue;
646 if (TMath::Abs(fTrackToFollow.GetY() - c->GetY()) > dy) continue;
006b5f7f 647
4ab260d6 648 chi2=fTrackToFollow.GetPredictedChi2(c); if (chi2<kMaxChi2) break;
006b5f7f 649 }
650
006b5f7f 651 if (chi2>=kMaxChi2) return 0;
652 if (!c) return 0;
653
006b5f7f 654 if (!fTrackToFollow.Update(c,chi2,(fI<<28)+ci)) {
8676d691 655 //Warning("TakeNextProlongation","filtering failed !\n");
006b5f7f 656 return 0;
657 }
23efe5f1 658
4ab260d6 659 if (fTrackToFollow.GetNumberOfClusters()>1)
660 if (TMath::Abs(fTrackToFollow.GetD())>4) return 0;
661
a9a2d814 662 fTrackToFollow.
663 SetSampledEdx(c->GetQ(),fTrackToFollow.GetNumberOfClusters()-1); //b.b.
664
665 {
880f41b9 666 Double_t x0;
61ab8ea8 667 Double_t d=layer.GetThickness(fTrackToFollow.GetY(),fTrackToFollow.GetZ(),x0);
880f41b9 668 fTrackToFollow.CorrectForMaterial(d,x0);
a9a2d814 669 }
4ab260d6 670
a9a2d814 671 if (fConstraint[fPass]) {
4ab260d6 672 Double_t d=GetEffectiveThickness(0,0); //Think of this !!!!
8676d691 673 Double_t xyz[]={GetX(),GetY(),GetZ()};
674 Double_t ers[]={GetSigmaX(),GetSigmaY(),GetSigmaZ()};
675 fTrackToFollow.Improve(d,xyz,ers);
a9a2d814 676 }
006b5f7f 677
006b5f7f 678 return 1;
679}
680
681
006b5f7f 682AliITStrackerV2::AliITSlayer::AliITSlayer() {
683 //--------------------------------------------------------------------
684 //default AliITSlayer constructor
685 //--------------------------------------------------------------------
686 fN=0;
687 fDetectors=0;
688}
689
690AliITStrackerV2::AliITSlayer::
691AliITSlayer(Double_t r,Double_t p,Double_t z,Int_t nl,Int_t nd) {
692 //--------------------------------------------------------------------
693 //main AliITSlayer constructor
694 //--------------------------------------------------------------------
695 fR=r; fPhiOffset=p; fZOffset=z;
696 fNladders=nl; fNdetectors=nd;
697 fDetectors=new AliITSdetector[fNladders*fNdetectors];
698
699 fN=0;
700 fI=0;
b87bd7cd 701
702 fRoad=2*fR*TMath::Sqrt(3.14/1.);//assuming that there's only one cluster
006b5f7f 703}
704
705AliITStrackerV2::AliITSlayer::~AliITSlayer() {
706 //--------------------------------------------------------------------
707 // AliITSlayer destructor
708 //--------------------------------------------------------------------
709 delete[] fDetectors;
710 for (Int_t i=0; i<fN; i++) delete fClusters[i];
711}
712
61ab8ea8 713void AliITStrackerV2::AliITSlayer::ResetClusters() {
714 //--------------------------------------------------------------------
715 // This function removes loaded clusters
716 //--------------------------------------------------------------------
717 for (Int_t i=0; i<fN; i++) delete fClusters[i];
718 fN=0;
719 fI=0;
720}
721
b87bd7cd 722void AliITStrackerV2::AliITSlayer::ResetRoad() {
723 //--------------------------------------------------------------------
724 // This function calculates the road defined by the cluster density
725 //--------------------------------------------------------------------
726 Int_t n=0;
727 for (Int_t i=0; i<fN; i++) {
728 if (TMath::Abs(fClusters[i]->GetZ())<fR) n++;
729 }
730 if (n>1) fRoad=2*fR*TMath::Sqrt(3.14/n);
731}
732
006b5f7f 733Int_t AliITStrackerV2::AliITSlayer::InsertCluster(AliITSclusterV2 *c) {
734 //--------------------------------------------------------------------
735 //This function adds a cluster to this layer
736 //--------------------------------------------------------------------
737 if (fN==kMaxClusterPerLayer) {
8676d691 738 ::Error("InsertCluster","Too many clusters !\n");
739 return 1;
006b5f7f 740 }
741
742 if (fN==0) {fClusters[fN++]=c; return 0;}
743 Int_t i=FindClusterIndex(c->GetZ());
744 memmove(fClusters+i+1 ,fClusters+i,(fN-i)*sizeof(AliITSclusterV2*));
745 fClusters[i]=c; fN++;
746
747 return 0;
748}
749
750Int_t AliITStrackerV2::AliITSlayer::FindClusterIndex(Double_t z) const {
751 //--------------------------------------------------------------------
752 // This function returns the index of the nearest cluster
753 //--------------------------------------------------------------------
754 if (fN==0) return 0;
755 if (z <= fClusters[0]->GetZ()) return 0;
756 if (z > fClusters[fN-1]->GetZ()) return fN;
757 Int_t b=0, e=fN-1, m=(b+e)/2;
758 for (; b<e; m=(b+e)/2) {
759 if (z > fClusters[m]->GetZ()) b=m+1;
760 else e=m;
761 }
762 return m;
763}
764
765void AliITStrackerV2::AliITSlayer::
766SelectClusters(Double_t zmin,Double_t zmax,Double_t ymin, Double_t ymax) {
767 //--------------------------------------------------------------------
768 // This function sets the "window"
769 //--------------------------------------------------------------------
770 fI=FindClusterIndex(zmin); fZmax=zmax;
14825d5a 771 Double_t circle=2*TMath::Pi()*fR;
772 if (ymax>circle) { ymax-=circle; ymin-=circle; }
006b5f7f 773 fYmin=ymin; fYmax=ymax;
774}
775
776const AliITSclusterV2 *AliITStrackerV2::AliITSlayer::GetNextCluster(Int_t &ci){
777 //--------------------------------------------------------------------
778 // This function returns clusters within the "window"
779 //--------------------------------------------------------------------
780 const AliITSclusterV2 *cluster=0;
781 for (Int_t i=fI; i<fN; i++) {
782 const AliITSclusterV2 *c=fClusters[i];
783 if (c->GetZ() > fZmax) break;
784 if (c->IsUsed()) continue;
785 const AliITSdetector &det=GetDetector(c->GetDetectorIndex());
786 Double_t y=fR*det.GetPhi() + c->GetY();
787
788 if (y>2.*fR*TMath::Pi()) y -= 2*fR*TMath::Pi();
789 if (y>1.*fR*TMath::Pi() && fYmax<y) y -= 2*fR*TMath::Pi();
790
791 if (y<fYmin) continue;
792 if (y>fYmax) continue;
793 cluster=c; ci=i;
794 fI=i+1;
795 break;
796 }
7f6ddf58 797
006b5f7f 798 return cluster;
799}
800
801Int_t AliITStrackerV2::AliITSlayer::
802FindDetectorIndex(Double_t phi, Double_t z) const {
803 //--------------------------------------------------------------------
804 //This function finds the detector crossed by the track
805 //--------------------------------------------------------------------
806 Double_t dphi=phi-fPhiOffset;
807 if (dphi < 0) dphi += 2*TMath::Pi();
808 else if (dphi >= 2*TMath::Pi()) dphi -= 2*TMath::Pi();
809 Int_t np=Int_t(dphi*fNladders*0.5/TMath::Pi()+0.5);
3e3e8427 810 if (np>=fNladders) np-=fNladders;
811 if (np<0) np+=fNladders;
006b5f7f 812
813 Double_t dz=fZOffset-z;
814 Int_t nz=Int_t(dz*(fNdetectors-1)*0.5/fZOffset+0.5);
3e3e8427 815 if (nz>=fNdetectors) return -1;
816 if (nz<0) return -1;
006b5f7f 817
006b5f7f 818 return np*fNdetectors + nz;
819}
820
821Double_t
61ab8ea8 822AliITStrackerV2::AliITSlayer::GetThickness(Double_t y,Double_t z,Double_t &x0)
823const {
a9a2d814 824 //--------------------------------------------------------------------
825 //This function returns the layer thickness at this point (units X0)
826 //--------------------------------------------------------------------
827 Double_t d=0.0085;
61ab8ea8 828 x0=21.82;
a9a2d814 829
830 if (43<fR&&fR<45) { //SSD2
61ab8ea8 831 Double_t dd=0.0034;
832 d=dd;
833 if (TMath::Abs(y-0.00)>3.40) d+=dd;
834 if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);}
835 if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);}
a9a2d814 836 for (Int_t i=0; i<12; i++) {
61ab8ea8 837 if (TMath::Abs(z-3.9*(i+0.5))<0.15) {
838 if (TMath::Abs(y-0.00)>3.40) d+=dd;
839 d+=0.0034;
840 break;
841 }
842 if (TMath::Abs(z+3.9*(i+0.5))<0.15) {
843 if (TMath::Abs(y-0.00)>3.40) d+=dd;
844 d+=0.0034;
845 break;
846 }
847 if (TMath::Abs(z-3.4-3.9*i)<0.50) {d+=(0.016-0.0034); break;}
848 if (TMath::Abs(z+0.5+3.9*i)<0.50) {d+=(0.016-0.0034); break;}
a9a2d814 849 }
850 } else
851 if (37<fR&&fR<41) { //SSD1
61ab8ea8 852 Double_t dd=0.0034;
853 d=dd;
854 if (TMath::Abs(y-0.00)>3.40) d+=dd;
855 if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);}
856 if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);}
a9a2d814 857 for (Int_t i=0; i<11; i++) {
61ab8ea8 858 if (TMath::Abs(z-3.9*i)<0.15) {
859 if (TMath::Abs(y-0.00)>3.40) d+=dd;
860 d+=dd;
861 break;
862 }
863 if (TMath::Abs(z+3.9*i)<0.15) {
864 if (TMath::Abs(y-0.00)>3.40) d+=dd;
865 d+=dd;
866 break;
867 }
868 if (TMath::Abs(z-1.85-3.9*i)<0.50) {d+=(0.016-0.0034); break;}
869 if (TMath::Abs(z+2.05+3.9*i)<0.50) {d+=(0.016-0.0034); break;}
a9a2d814 870 }
871 } else
872 if (13<fR&&fR<26) { //SDD
61ab8ea8 873 Double_t dd=0.0033;
874 d=dd;
875 if (TMath::Abs(y-0.00)>3.30) d+=dd;
876
877 if (TMath::Abs(y-1.80)<0.55) {
878 d+=0.016;
879 for (Int_t j=0; j<20; j++) {
880 if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;}
881 if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;}
882 }
883 }
884 if (TMath::Abs(y+1.80)<0.55) {
885 d+=0.016;
886 for (Int_t j=0; j<20; j++) {
887 if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;}
888 if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;}
889 }
890 }
891
892 for (Int_t i=0; i<4; i++) {
893 if (TMath::Abs(z-7.3*i)<0.60) {
894 d+=dd;
895 if (TMath::Abs(y-0.00)>3.30) d+=dd;
896 break;
897 }
898 if (TMath::Abs(z+7.3*i)<0.60) {
899 d+=dd;
900 if (TMath::Abs(y-0.00)>3.30) d+=dd;
901 break;
902 }
a9a2d814 903 }
904 } else
905 if (6<fR&&fR<8) { //SPD2
61ab8ea8 906 Double_t dd=0.0063; x0=21.5;
907 d=dd;
908 if (TMath::Abs(y-3.08)>0.5) d+=dd;
909 //if (TMath::Abs(y-3.08)>0.45) d+=dd;
910 if (TMath::Abs(y-3.03)<0.10) {d+=0.014;}
a9a2d814 911 } else
912 if (3<fR&&fR<5) { //SPD1
61ab8ea8 913 Double_t dd=0.0063; x0=21.5;
914 d=dd;
915 if (TMath::Abs(y+0.21)>0.6) d+=dd;
916 //if (TMath::Abs(y+0.21)>0.45) d+=dd;
917 if (TMath::Abs(y+0.10)<0.10) {d+=0.014;}
a9a2d814 918 }
919
a9a2d814 920 return d;
921}
006b5f7f 922
a9a2d814 923Double_t AliITStrackerV2::GetEffectiveThickness(Double_t y,Double_t z) const
006b5f7f 924{
925 //--------------------------------------------------------------------
a9a2d814 926 //Returns the thickness between the current layer and the vertex (units X0)
006b5f7f 927 //--------------------------------------------------------------------
61ab8ea8 928 Double_t d=0.0028*3*3; //beam pipe
929 Double_t x0=0;
006b5f7f 930
931 Double_t xn=fLayers[fI].GetR();
932 for (Int_t i=0; i<fI; i++) {
933 Double_t xi=fLayers[i].GetR();
61ab8ea8 934 d+=fLayers[i].GetThickness(y,z,x0)*xi*xi;
006b5f7f 935 }
936
937 if (fI>1) {
61ab8ea8 938 Double_t xi=9.;
939 d+=0.0097*xi*xi;
006b5f7f 940 }
941
942 if (fI>3) {
943 Double_t xi=0.5*(fLayers[3].GetR()+fLayers[4].GetR());
61ab8ea8 944 d+=0.0034*xi*xi;
006b5f7f 945 }
61ab8ea8 946
006b5f7f 947 return d/(xn*xn);
948}
949
006b5f7f 950Int_t AliITStrackerV2::AliITSlayer::InRoad() const {
951 //--------------------------------------------------------------------
952 // This function returns number of clusters within the "window"
953 //--------------------------------------------------------------------
954 Int_t ncl=0;
955 for (Int_t i=fI; i<fN; i++) {
956 const AliITSclusterV2 *c=fClusters[i];
957 if (c->GetZ() > fZmax) break;
a9a2d814 958 if (c->IsUsed()) continue;
006b5f7f 959 const AliITSdetector &det=GetDetector(c->GetDetectorIndex());
960 Double_t y=fR*det.GetPhi() + c->GetY();
961
962 if (y>2.*fR*TMath::Pi()) y -= 2*fR*TMath::Pi();
963 if (y>1.*fR*TMath::Pi() && fYmax<y) y -= 2*fR*TMath::Pi();
964
965 if (y<fYmin) continue;
966 if (y>fYmax) continue;
967 ncl++;
968 }
969 return ncl;
970}
971
880f41b9 972Bool_t
973AliITStrackerV2::RefitAt(Double_t x,const AliITStrackV2 *s,AliITStrackV2 *ot) {
4ab260d6 974 //--------------------------------------------------------------------
975 // This function refits a track at a given position
976 //--------------------------------------------------------------------
880f41b9 977 AliITStrackV2 save(*ot), *t=&save;
978 Int_t index[kMaxLayer];
979 Int_t k;
980 for (k=0; k<kMaxLayer; k++) index[k]=-1;
981 Int_t nc=t->GetNumberOfClusters();
982 for (k=0; k<nc; k++) {
983 Int_t idx=t->GetClusterIndex(k),nl=(idx&0xf0000000)>>28;
984 index[nl]=idx;
985 }
986 t->~AliITStrackV2(); new (t) AliITStrackV2(*s);
987
4ab260d6 988 Int_t from, to, step;
989 if (x > t->GetX()) {
990 from=0; to=kMaxLayer;
991 step=+1;
992 } else {
993 from=kMaxLayer-1; to=-1;
994 step=-1;
995 }
996
997 for (Int_t i=from; i != to; i += step) {
998 AliITSlayer &layer=fLayers[i];
999 Double_t r=layer.GetR();
1000
1001 {
1002 Double_t hI=i-0.5*step;
880f41b9 1003 if (TMath::Abs(hI-1.5)<0.01 || TMath::Abs(hI-3.5)<0.01) {
4ab260d6 1004 Double_t rs=0.5*(fLayers[i-step].GetR() + r);
61ab8ea8 1005 Double_t d=0.0034, x0=38.6;
880f41b9 1006 if (TMath::Abs(hI-1.5)<0.01) {rs=9.; d=0.0097; x0=42;}
1007 if (!t->PropagateTo(rs,-step*d,x0)) {
4ab260d6 1008 return kFALSE;
1009 }
1010 }
1011 }
1012
880f41b9 1013 // remember old position [SR, GSI 18.02.2003]
1014 Double_t oldX=0., oldY=0., oldZ=0.;
1015 if (t->IsStartedTimeIntegral() && step==1) {
1016 t->GetGlobalXYZat(t->GetX(),oldX,oldY,oldZ);
1017 }
1018 //
1019
4ab260d6 1020 Double_t x,y,z;
1021 if (!t->GetGlobalXYZat(r,x,y,z)) {
1022 return kFALSE;
1023 }
1024 Double_t phi=TMath::ATan2(y,x);
1025 Int_t idet=layer.FindDetectorIndex(phi,z);
1026 if (idet<0) {
1027 return kFALSE;
1028 }
1029 const AliITSdetector &det=layer.GetDetector(idet);
1030 phi=det.GetPhi();
1031 if (!t->Propagate(phi,det.GetR())) {
1032 return kFALSE;
1033 }
1034 t->SetDetectorIndex(idet);
1035
1036 const AliITSclusterV2 *cl=0;
1037 Double_t maxchi2=kMaxChi2;
1038
1039 Int_t idx=index[i];
1040 if (idx>0) {
1041 const AliITSclusterV2 *c=(AliITSclusterV2 *)GetCluster(idx);
1042 if (idet != c->GetDetectorIndex()) {
1043 idet=c->GetDetectorIndex();
1044 const AliITSdetector &det=layer.GetDetector(idet);
1045 if (!t->Propagate(det.GetPhi(),det.GetR())) {
1046 return kFALSE;
1047 }
1048 t->SetDetectorIndex(idet);
1049 }
1050 Double_t chi2=t->GetPredictedChi2(c);
1051 if (chi2<maxchi2) { cl=c; maxchi2=chi2; }
1052 else return kFALSE;
1053 }
4ab260d6 1054 /*
1055 if (cl==0)
1056 if (t->GetNumberOfClusters()>2) {
1057 Double_t dz=4*TMath::Sqrt(t->GetSigmaZ2()+kSigmaZ2[i]);
1058 Double_t dy=4*TMath::Sqrt(t->GetSigmaY2()+kSigmaY2[i]);
1059 Double_t zmin=t->GetZ() - dz;
1060 Double_t zmax=t->GetZ() + dz;
1061 Double_t ymin=t->GetY() + phi*r - dy;
1062 Double_t ymax=t->GetY() + phi*r + dy;
1063 layer.SelectClusters(zmin,zmax,ymin,ymax);
1064
1065 const AliITSclusterV2 *c=0; Int_t ci=-1;
1066 while ((c=layer.GetNextCluster(ci))!=0) {
1067 if (idet != c->GetDetectorIndex()) continue;
1068 Double_t chi2=t->GetPredictedChi2(c);
1069 if (chi2<maxchi2) { cl=c; maxchi2=chi2; idx=ci; }
1070 }
1071 }
1072 */
4ab260d6 1073 if (cl) {
1074 if (!t->Update(cl,maxchi2,idx)) {
1075 return kFALSE;
1076 }
880f41b9 1077 t->SetSampledEdx(cl->GetQ(),t->GetNumberOfClusters()-1);
4ab260d6 1078 }
1079
1080 {
61ab8ea8 1081 Double_t x0;
1082 Double_t d=layer.GetThickness(t->GetY(),t->GetZ(),x0);
1083 t->CorrectForMaterial(-step*d,x0);
4ab260d6 1084 }
880f41b9 1085
1086 // track time update [SR, GSI 17.02.2003]
1087 if (t->IsStartedTimeIntegral() && step==1) {
1088 Double_t newX, newY, newZ;
1089 t->GetGlobalXYZat(t->GetX(),newX,newY,newZ);
1090 Double_t dL2 = (oldX-newX)*(oldX-newX) + (oldY-newY)*(oldY-newY) +
1091 (oldZ-newZ)*(oldZ-newZ);
1092 t->AddTimeStep(TMath::Sqrt(dL2));
1093 }
1094 //
4ab260d6 1095
1096 }
1097
1098 if (!t->PropagateTo(x,0.,0.)) return kFALSE;
880f41b9 1099 ot->~AliITStrackV2(); new (ot) AliITStrackV2(*t);
4ab260d6 1100 return kTRUE;
1101}
1102
b87bd7cd 1103void AliITStrackerV2::UseClusters(const AliKalmanTrack *t, Int_t from) const {
1104 //--------------------------------------------------------------------
1105 // This function marks clusters assigned to the track
1106 //--------------------------------------------------------------------
1107 AliTracker::UseClusters(t,from);
880f41b9 1108
b87bd7cd 1109 AliITSclusterV2 *c=(AliITSclusterV2 *)GetCluster(t->GetClusterIndex(0));
1110 //if (c->GetQ()>2) c->Use();
1111 if (c->GetSigmaZ2()>0.1) c->Use();
1112 c=(AliITSclusterV2 *)GetCluster(t->GetClusterIndex(1));
1113 //if (c->GetQ()>2) c->Use();
1114 if (c->GetSigmaZ2()>0.1) c->Use();
880f41b9 1115
b87bd7cd 1116}