stdlib.h included to declare exit() on HP
[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
23#include <stdlib.h>
006b5f7f 24#include <TFile.h>
25#include <TTree.h>
26#include <TRandom.h>
4ae5bbc4 27#include <Riostream.h>
006b5f7f 28
29#include "AliITSgeom.h"
30#include "AliITSRecPoint.h"
517b130f 31#include "AliTPCtrack.h"
006b5f7f 32#include "AliITSclusterV2.h"
33#include "AliITStrackerV2.h"
34
35//#define DEBUG
36
37#ifdef DEBUG
61ab8ea8 38Int_t LAB=113;
006b5f7f 39#endif
40
006b5f7f 41AliITStrackerV2::AliITSlayer AliITStrackerV2::fLayers[kMaxLayer]; // ITS layers
42
61ab8ea8 43AliITStrackerV2::AliITStrackerV2(const AliITSgeom *geom) : AliTracker() {
006b5f7f 44 //--------------------------------------------------------------------
61ab8ea8 45 //This is the AliITStrackerV2 constructor
006b5f7f 46 //--------------------------------------------------------------------
006b5f7f 47 AliITSgeom *g=(AliITSgeom*)geom;
48
49 Float_t x,y,z;
50 Int_t i;
51 for (i=1; i<kMaxLayer+1; i++) {
52 Int_t nlad=g->GetNladders(i);
53 Int_t ndet=g->GetNdetectors(i);
54
55 g->GetTrans(i,1,1,x,y,z);
56 Double_t r=TMath::Sqrt(x*x + y*y);
57 Double_t poff=TMath::ATan2(y,x);
58 Double_t zoff=z;
59
60 g->GetTrans(i,1,2,x,y,z);
61 r += TMath::Sqrt(x*x + y*y);
62 g->GetTrans(i,2,1,x,y,z);
63 r += TMath::Sqrt(x*x + y*y);
64 g->GetTrans(i,2,2,x,y,z);
65 r += TMath::Sqrt(x*x + y*y);
66 r*=0.25;
67
68 new (fLayers+i-1) AliITSlayer(r,poff,zoff,nlad,ndet);
69
70 for (Int_t j=1; j<nlad+1; j++) {
71 for (Int_t k=1; k<ndet+1; k++) { //Fill this layer with detectors
72 Float_t x,y,zshift; g->GetTrans(i,j,k,x,y,zshift);
73 Double_t rot[9]; g->GetRotMatrix(i,j,k,rot);
74
75 Double_t r =-x*rot[1] + y*rot[0]; if (i==1) r=-r;
76 Double_t phi=TMath::ATan2(rot[1],rot[0]); if (i==1) phi-=3.1415927;
61ab8ea8 77 phi+=0.5*TMath::Pi(); if (phi<0) phi += 2*TMath::Pi();
006b5f7f 78 AliITSdetector &det=fLayers[i-1].GetDetector((j-1)*ndet + k-1);
79
006b5f7f 80 new(&det) AliITSdetector(r,phi);
81 }
82 }
83
84 }
85
61ab8ea8 86 fI=kMaxLayer;
743a19f2 87
61ab8ea8 88 fPass=0;
89 fConstraint[0]=1; fConstraint[1]=0;
90}
006b5f7f 91
61ab8ea8 92void AliITStrackerV2::LoadClusters() {
93 //--------------------------------------------------------------------
94 //This function loads ITS clusters
95 //--------------------------------------------------------------------
96 char cname[100];
97 sprintf(cname,"TreeC_ITS_%d",GetEventNumber());
98 TTree *cTree=(TTree*)gDirectory->Get(cname);
99 if (!cTree) {
100 cerr<<"AliITStrackerV2::LoadClusters can't get cTree !\n";
101 exit(1);
102 }
103 TBranch *branch=cTree->GetBranch("Clusters");
104 if (!branch) {
105 cerr<<"AliITStrackerV2::LoadClusters can't get Clusters branch !\n";
106 exit(1);
107 }
006b5f7f 108
61ab8ea8 109 TClonesArray dummy("AliITSclusterV2",10000), *clusters=&dummy;
110 branch->SetAddress(&clusters);
006b5f7f 111
61ab8ea8 112 Int_t j=0;
113 for (Int_t i=0; i<kMaxLayer; i++) {
114 Int_t jmax = j + fLayers[i].GetNladders()*fLayers[i].GetNdetectors();
115 for (; j<jmax; j++) {
116 if (!cTree->GetEvent(j)) continue;
117 Int_t ncl=clusters->GetEntriesFast();
118 while (ncl--) {
119 AliITSclusterV2 *c=(AliITSclusterV2*)clusters->UncheckedAt(ncl);
006b5f7f 120
121#ifdef DEBUG
122if (c->GetLabel(2)!=LAB)
123if (c->GetLabel(1)!=LAB)
124if (c->GetLabel(0)!=LAB) continue;
125cout<<lay-1<<' '<<lad-1<<' '<<det-1<<' '<<c->GetY()<<' '<<c->GetZ()<<endl;
126#endif
127
61ab8ea8 128 fLayers[i].InsertCluster(new AliITSclusterV2(*c));
129 }
130 clusters->Delete();
131 }
006b5f7f 132 }
61ab8ea8 133 delete cTree; //Thanks to Mariana Bondila
134}
006b5f7f 135
61ab8ea8 136void AliITStrackerV2::UnloadClusters() {
137 //--------------------------------------------------------------------
138 //This function unloads ITS clusters
139 //--------------------------------------------------------------------
140 for (Int_t i=0; i<kMaxLayer; i++) fLayers[i].ResetClusters();
006b5f7f 141}
142
4ab260d6 143//#ifdef DEBUG
006b5f7f 144static Int_t lbl;
4ab260d6 145//#endif
006b5f7f 146
147Int_t AliITStrackerV2::Clusters2Tracks(const TFile *inp, TFile *out) {
148 //--------------------------------------------------------------------
149 //This functions reconstructs ITS tracks
150 //--------------------------------------------------------------------
151 TFile *in=(TFile*)inp;
152 TDirectory *savedir=gDirectory;
153
61ab8ea8 154 LoadClusters();
155
006b5f7f 156 if (!in->IsOpen()) {
157 cerr<<"AliITStrackerV2::Clusters2Tracks(): ";
158 cerr<<"file with TPC tracks is not open !\n";
159 return 1;
160 }
161
162 if (!out->IsOpen()) {
163 cerr<<"AliITStrackerV2::Clusters2Tracks(): ";
164 cerr<<"file for ITS tracks is not open !\n";
165 return 2;
166 }
167
7f6ddf58 168 in->cd();
169
61ab8ea8 170 Char_t tname[100];
a7554aa9 171 Int_t nentr=0; TObjArray itsTracks(15000);
7f6ddf58 172
173 {/* Read TPC tracks */
61ab8ea8 174 sprintf(tname,"TreeT_TPC_%d",GetEventNumber());
7f6ddf58 175 TTree *tpcTree=(TTree*)in->Get(tname);
176 if (!tpcTree) {
177 cerr<<"AliITStrackerV2::Clusters2Tracks(): "
178 "can't get a tree with TPC tracks !\n";
179 return 3;
180 }
181 AliTPCtrack *itrack=new AliTPCtrack;
182 tpcTree->SetBranchAddress("tracks",&itrack);
183 nentr=(Int_t)tpcTree->GetEntries();
184 for (Int_t i=0; i<nentr; i++) {
185 tpcTree->GetEvent(i);
4ab260d6 186 AliITStrackV2 *t=0;
187 try {
188 t=new AliITStrackV2(*itrack);
189 } catch (const Char_t *msg) {
190 cerr<<msg<<endl;
191 delete t;
192 continue;
193 }
a9a2d814 194 if (TMath::Abs(t->GetD())>4) continue;
195
61ab8ea8 196 t->PropagateTo(80.,0.0053,30);
197 if (TMath::Abs(t->GetY())>12.8) t->CorrectForMaterial(0.03);
a9a2d814 198 if (TMath::Abs(t->GetZ())<0.2) t->CorrectForMaterial(0.40);
61ab8ea8 199 t->PropagateTo(61.,0.0053,30);
200 //Double_t xk=52.,x,y,z; t->GetGlobalXYZat(xk,x,y,z);
201 //if (TMath::Abs(y)<7.77) t->PropagateTo(xk,0.19,24.);
a9a2d814 202 t->PropagateTo(50.,0.001);
203
204 itsTracks.AddLast(t);
7f6ddf58 205 }
206 delete tpcTree; //Thanks to Mariana Bondila
207 delete itrack;
006b5f7f 208 }
7f6ddf58 209 itsTracks.Sort();
006b5f7f 210
211 out->cd();
7f6ddf58 212
61ab8ea8 213 sprintf(tname,"TreeT_ITS_%d",GetEventNumber());
7f6ddf58 214 TTree itsTree(tname,"Tree with ITS tracks");
006b5f7f 215 AliITStrackV2 *otrack=&fBestTrack;
216 itsTree.Branch("tracks","AliITStrackV2",&otrack,32000,0);
217
7f6ddf58 218 for (fPass=0; fPass<2; fPass++) {
219 Int_t &constraint=fConstraint[fPass]; if (constraint<0) continue;
220 for (Int_t i=0; i<nentr; i++) {
221 if (i%10==0) cerr<<nentr-i<<" \r";
222 AliITStrackV2 *t=(AliITStrackV2*)itsTracks.UncheckedAt(i);
223 if (t==0) continue; //this track has been already tracked
224 Int_t tpcLabel=t->GetLabel(); //save the TPC track label
a9a2d814 225
4ab260d6 226lbl=tpcLabel;
006b5f7f 227#ifdef DEBUG
14825d5a 228lbl=tpcLabel;
006b5f7f 229if (TMath::Abs(tpcLabel)!=LAB) continue;
230cout<<tpcLabel<<" *****************\n";
231#endif
a9a2d814 232
4ab260d6 233 ResetTrackToFollow(*t);
7f6ddf58 234 ResetBestTrack();
006b5f7f 235
7f6ddf58 236 for (FollowProlongation(); fI<kMaxLayer; fI++) {
237 while (TakeNextProlongation()) FollowProlongation();
238 }
006b5f7f 239
240#ifdef DEBUG
241cout<<fBestTrack.GetNumberOfClusters()<<" number of clusters\n\n";
242#endif
243
4ab260d6 244 if (fBestTrack.GetNumberOfClusters() < kMaxLayer-kLayersToSkip) continue;
245
246 if (fConstraint[fPass]) {
247 Int_t index[kMaxLayer];
248 Int_t k;
249 for (k=0; k<kMaxLayer; k++) index[k]=-1;
250 Int_t nc=fBestTrack.GetNumberOfClusters();
251 for (k=0; k<nc; k++) {
252 Int_t idx=fBestTrack.GetClusterIndex(k),nl=(idx&0xf0000000)>>28;
253 index[nl]=idx;
254 }
255 fBestTrack.~AliITStrackV2(); new(&fBestTrack) AliITStrackV2(*t);
256 if (!RefitAt(3.7, &fBestTrack, index)) continue;
257 }
258
259 fBestTrack.SetLabel(tpcLabel);
260 fBestTrack.CookdEdx();
261 CookLabel(&fBestTrack,0.); //For comparison only
262 itsTree.Fill();
263 UseClusters(&fBestTrack);
264 delete itsTracks.RemoveAt(i);
006b5f7f 265
7f6ddf58 266 }
006b5f7f 267 }
006b5f7f 268
7f6ddf58 269 itsTree.Write();
c7ee21ca 270
7f6ddf58 271 itsTracks.Delete();
61ab8ea8 272
273 UnloadClusters();
274
7f6ddf58 275 savedir->cd();
276 cerr<<"Number of TPC tracks: "<<nentr<<endl;
277 cerr<<"Number of prolonged tracks: "<<itsTree.GetEntries()<<endl;
006b5f7f 278
279 return 0;
280}
281
14825d5a 282Int_t AliITStrackerV2::PropagateBack(const TFile *inp, TFile *out) {
283 //--------------------------------------------------------------------
284 //This functions propagates reconstructed ITS tracks back
285 //--------------------------------------------------------------------
286 TFile *in=(TFile*)inp;
287 TDirectory *savedir=gDirectory;
288
61ab8ea8 289 LoadClusters();
290
14825d5a 291 if (!in->IsOpen()) {
292 cerr<<"AliITStrackerV2::PropagateBack(): ";
293 cerr<<"file with ITS tracks is not open !\n";
294 return 1;
295 }
296
297 if (!out->IsOpen()) {
298 cerr<<"AliITStrackerV2::PropagateBack(): ";
299 cerr<<"file for back propagated ITS tracks is not open !\n";
300 return 2;
301 }
302
303 in->cd();
61ab8ea8 304
305 Char_t tname[100];
306 sprintf(tname,"TreeT_ITS_%d",GetEventNumber());
307 TTree *itsTree=(TTree*)in->Get(tname);
14825d5a 308 if (!itsTree) {
309 cerr<<"AliITStrackerV2::PropagateBack() ";
310 cerr<<"can't get a tree with ITS tracks !\n";
311 return 3;
312 }
313 AliITStrackV2 *itrack=new AliITStrackV2;
314 itsTree->SetBranchAddress("tracks",&itrack);
315
316 out->cd();
61ab8ea8 317
318 sprintf(tname,"TreeT_ITSb_%d",GetEventNumber());
319 TTree backTree(tname,"Tree with back propagated ITS tracks");
14825d5a 320 AliTPCtrack *otrack=0;
321 backTree.Branch("tracks","AliTPCtrack",&otrack,32000,0);
322
323 Int_t ntrk=0;
324
325 Int_t nentr=(Int_t)itsTree->GetEntries();
326 for (Int_t i=0; i<nentr; i++) {
327 itsTree->GetEvent(i);
328 ResetTrackToFollow(*itrack);
329 fTrackToFollow.ResetCovariance(); fTrackToFollow.ResetClusters();
330 Int_t itsLabel=fTrackToFollow.GetLabel(); //save the ITS track label
331
332#ifdef DEBUG
333if (TMath::Abs(itsLabel)!=LAB) continue;
334cout<<itsLabel<<" *****************\n";
335#endif
336
337 try {
338 Int_t nc=itrack->GetNumberOfClusters();
339#ifdef DEBUG
340for (Int_t k=0; k<nc; k++) {
341 Int_t index=itrack->GetClusterIndex(k);
342 AliITSclusterV2 *c=(AliITSclusterV2*)GetCluster(index);
343 cout<<c->GetLabel(0)<<' '<<c->GetLabel(1)<<' '<<c->GetLabel(2)<<endl;
344}
345#endif
346 Int_t idx=0, l=0;
347 const AliITSclusterV2 *c=0;
348 if (nc--) {
349 idx=itrack->GetClusterIndex(nc); l=(idx&0xf0000000)>>28;
350 c=(AliITSclusterV2*)GetCluster(idx);
351 }
352 for (fI=0; fI<kMaxLayer; fI++) {
353 AliITSlayer &layer=fLayers[fI];
354 Double_t r=layer.GetR();
355 if (fI==2 || fI==4) {
356 Double_t rs=0.5*(fLayers[fI-1].GetR() + r);
61ab8ea8 357 Double_t d=0.0034, x0=38.6;
358 if (fI==2) {rs=9.; d=0.0097; x0=42.;}
359 if (!fTrackToFollow.PropagateTo(rs,-d,x0)) throw "";
14825d5a 360 }
361
362 Double_t x,y,z;
363 if (!fTrackToFollow.GetGlobalXYZat(r,x,y,z))
364 throw "AliITStrackerV2::PropagateBack: failed to estimate track !";
365 Double_t phi=TMath::ATan2(y,x);
14825d5a 366 Int_t idet=layer.FindDetectorIndex(phi,z);
367 if (idet<0)
368 throw "AliITStrackerV2::PropagateBack: failed to find a detector !\n";
369 const AliITSdetector &det=layer.GetDetector(idet);
370 r=det.GetR(); phi=det.GetPhi();
a9a2d814 371 if (!fTrackToFollow.Propagate(phi,r)) throw "";
372 fTrackToFollow.SetDetectorIndex(idet);
14825d5a 373
374 const AliITSclusterV2 *cl=0;
375 Int_t index=0;
376 Double_t maxchi2=kMaxChi2;
377
378 if (l==fI) {
a9a2d814 379 idet=c->GetDetectorIndex();
380 if (idet != fTrackToFollow.GetDetectorIndex()) {
14825d5a 381 const AliITSdetector &det=layer.GetDetector(idet);
382 r=det.GetR(); phi=det.GetPhi();
a9a2d814 383 if (!fTrackToFollow.Propagate(phi,r)) throw "";
384 fTrackToFollow.SetDetectorIndex(idet);
14825d5a 385 }
386 Double_t chi2=fTrackToFollow.GetPredictedChi2(c);
387 if (chi2<kMaxChi2) {
388 cl=c; maxchi2=chi2; index=idx;
389 }
390 if (nc--) {
391 idx=itrack->GetClusterIndex(nc); l=(idx&0xf0000000)>>28;
392 c=(AliITSclusterV2*)GetCluster(idx);
393 }
394 }
395
396 if (fTrackToFollow.GetNumberOfClusters()>2) {
397 Double_t dz=3*TMath::Sqrt(fTrackToFollow.GetSigmaZ2()+kSigmaZ2[fI]);
398 Double_t dy=3*TMath::Sqrt(fTrackToFollow.GetSigmaY2()+kSigmaY2[fI]);
399 Double_t zmin=fTrackToFollow.GetZ() - dz;
400 Double_t zmax=fTrackToFollow.GetZ() + dz;
401 Double_t ymin=fTrackToFollow.GetY() + phi*r - dy;
402 Double_t ymax=fTrackToFollow.GetY() + phi*r + dy;
403 layer.SelectClusters(zmin,zmax,ymin,ymax);
404
405 const AliITSclusterV2 *cc=0; Int_t ci;
406 while ((cc=layer.GetNextCluster(ci))!=0) {
a9a2d814 407 idet=cc->GetDetectorIndex();
408 if (idet != fTrackToFollow.GetDetectorIndex()) continue;
14825d5a 409 Double_t chi2=fTrackToFollow.GetPredictedChi2(cc);
410 if (chi2<maxchi2) {
411 cl=cc; index=(fI<<28)+ci; maxchi2=chi2;
412 }
413 }
414 }
415
416 if (cl) {
417 if (!fTrackToFollow.Update(cl,maxchi2,index))
418 cerr<<"AliITStrackerV2::PropagateBack: filtering failed !\n";
14825d5a 419 }
61ab8ea8 420 {
421 Double_t x0;
422 x=layer.GetThickness(fTrackToFollow.GetY(),fTrackToFollow.GetZ(),x0);
423 fTrackToFollow.CorrectForMaterial(-x,x0);
424 }
14825d5a 425 }
426
61ab8ea8 427 fTrackToFollow.PropagateTo(50.,-0.001);
428 //Double_t xk=52.,x,y,z; fTrackToFollow.GetGlobalXYZat(xk,x,y,z);
429 //if (TMath::Abs(y)<7.77) fTrackToFollow.PropagateTo(xk,-0.19,24.);
430 fTrackToFollow.PropagateTo(61,-0.0053,30);
431 fTrackToFollow.PropagateTo(80.,-0.0053,30);
14825d5a 432
433 fTrackToFollow.SetLabel(itsLabel);
434 otrack=new AliTPCtrack(fTrackToFollow,fTrackToFollow.GetAlpha());
435 backTree.Fill(); delete otrack;
436 UseClusters(&fTrackToFollow);
437 cerr << ++ntrk << " \r";
438 }
439 catch (const Char_t *msg) {
440 cerr<<msg<<endl;
441 }
442 }
443
444 backTree.Write();
61ab8ea8 445
14825d5a 446 cerr<<"Number of ITS tracks: "<<nentr<<endl;
447 cerr<<"Number of back propagated ITS tracks: "<<ntrk<<endl;
448
449 delete itrack;
450
c7ee21ca 451 delete itsTree; //Thanks to Mariana Bondila
452
61ab8ea8 453 UnloadClusters();
454
455 savedir->cd();
456
14825d5a 457 return 0;
458}
006b5f7f 459
460AliCluster *AliITStrackerV2::GetCluster(Int_t index) const {
461 //--------------------------------------------------------------------
462 // Return pointer to a given cluster
463 //--------------------------------------------------------------------
464 Int_t l=(index & 0xf0000000) >> 28;
465 Int_t c=(index & 0x0fffffff) >> 00;
466 return fLayers[l].GetCluster(c);
467}
468
469
470void AliITStrackerV2::FollowProlongation() {
471 //--------------------------------------------------------------------
472 //This function finds a track prolongation
473 //--------------------------------------------------------------------
474 Int_t tryAgain=kLayersToSkip;
475
476 while (fI) {
a9a2d814 477 Int_t i=fI-1;
006b5f7f 478#ifdef DEBUG
a9a2d814 479cout<<i<<' ';
006b5f7f 480#endif
a9a2d814 481 AliITSlayer &layer=fLayers[i];
482 AliITStrackV2 &track=fTracks[i];
006b5f7f 483
14825d5a 484 Double_t r=layer.GetR();
61ab8ea8 485
a9a2d814 486 if (i==3 || i==1) {
487 Double_t rs=0.5*(fLayers[i+1].GetR() + r);
61ab8ea8 488 Double_t d=0.0034, x0=38.6;
489 if (i==1) {rs=9.; d=0.0097; x0=42;}
490 if (!fTrackToFollow.PropagateTo(rs,d,x0)) {
a9a2d814 491 //cerr<<"AliITStrackerV2::FollowProlongation: "
492 //"propagation failed !\n";
493 break;
494 }
006b5f7f 495 }
496
497 //find intersection
498 Double_t x,y,z;
14825d5a 499 if (!fTrackToFollow.GetGlobalXYZat(r,x,y,z)) {
7f6ddf58 500 //cerr<<"AliITStrackerV2::FollowProlongation: "
501 //"failed to estimate track !\n";
a9a2d814 502 break;
006b5f7f 503 }
504 Double_t phi=TMath::ATan2(y,x);
006b5f7f 505 Int_t idet=layer.FindDetectorIndex(phi,z);
506 if (idet<0) {
7f6ddf58 507 //cerr<<"AliITStrackerV2::FollowProlongation: "
508 //"failed to find a detector !\n";
006b5f7f 509 break;
510 }
511
512 //propagate to the intersection
513 const AliITSdetector &det=layer.GetDetector(idet);
14825d5a 514 phi=det.GetPhi();
a9a2d814 515 if (!fTrackToFollow.Propagate(phi,det.GetR())) {
7f6ddf58 516 //cerr<<"AliITStrackerV2::FollowProlongation: propagation failed !\n";
006b5f7f 517 break;
518 }
519 fTrackToFollow.SetDetectorIndex(idet);
520
521 //Select possible prolongations and store the current track estimation
522 track.~AliITStrackV2(); new(&track) AliITStrackV2(fTrackToFollow);
a9a2d814 523 Double_t dz=3*TMath::Sqrt(track.GetSigmaZ2() + kSigmaZ2[i]);
14825d5a 524 if (dz < 0.5*TMath::Abs(track.GetTgl())) dz=0.5*TMath::Abs(track.GetTgl());
7f6ddf58 525 if (dz > kMaxRoad) {
006b5f7f 526 //cerr<<"AliITStrackerV2::FollowProlongation: too broad road in Z !\n";
527 break;
528 }
a9a2d814 529
530 if (TMath::Abs(fTrackToFollow.GetZ()-GetZ()) > r+dz) break;
531
532 Double_t dy=4*TMath::Sqrt(track.GetSigmaY2() + kSigmaY2[i]);
14825d5a 533 if (dy < 0.5*TMath::Abs(track.GetSnp())) dy=0.5*TMath::Abs(track.GetSnp());
7f6ddf58 534 if (dy > kMaxRoad) {
006b5f7f 535 //cerr<<"AliITStrackerV2::FollowProlongation: too broad road in Y !\n";
536 break;
537 }
a9a2d814 538
7f6ddf58 539 Double_t zmin=track.GetZ() - dz;
006b5f7f 540 Double_t zmax=track.GetZ() + dz;
14825d5a 541 Double_t ymin=track.GetY() + r*phi - dy;
542 Double_t ymax=track.GetY() + r*phi + dy;
a9a2d814 543 layer.SelectClusters(zmin,zmax,ymin,ymax);
544 fI--;
006b5f7f 545
006b5f7f 546 //take another prolongation
547 if (!TakeNextProlongation()) if (!tryAgain--) break;
548 tryAgain=kLayersToSkip;
549
550 }
551
552 //deal with the best track
553 Int_t ncl=fTrackToFollow.GetNumberOfClusters();
554 Int_t nclb=fBestTrack.GetNumberOfClusters();
555 if (ncl)
556 if (ncl >= nclb) {
557 Double_t chi2=fTrackToFollow.GetChi2();
558 if (chi2/ncl < kChi2PerCluster) {
559 if (ncl > nclb || chi2 < fBestTrack.GetChi2()) {
560 ResetBestTrack();
561 }
562 }
563 }
564
006b5f7f 565}
566
006b5f7f 567Int_t AliITStrackerV2::TakeNextProlongation() {
568 //--------------------------------------------------------------------
a9a2d814 569 // This function takes another track prolongation
570 //
571 // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch
006b5f7f 572 //--------------------------------------------------------------------
006b5f7f 573 AliITSlayer &layer=fLayers[fI];
4ab260d6 574 ResetTrackToFollow(fTracks[fI]);
006b5f7f 575
4ab260d6 576 Double_t dz=4*TMath::Sqrt(fTrackToFollow.GetSigmaZ2() + kSigmaZ2[fI]);
577 Double_t dy=4*TMath::Sqrt(fTrackToFollow.GetSigmaY2() + kSigmaY2[fI]);
006b5f7f 578
579 const AliITSclusterV2 *c=0; Int_t ci=-1;
580 Double_t chi2=12345.;
581 while ((c=layer.GetNextCluster(ci))!=0) {
a9a2d814 582 //if (c->GetLabel(0)!=TMath::Abs(lbl)) continue;
006b5f7f 583 Int_t idet=c->GetDetectorIndex();
584
4ab260d6 585 if (fTrackToFollow.GetDetectorIndex()!=idet) {
006b5f7f 586 const AliITSdetector &det=layer.GetDetector(idet);
4ab260d6 587 ResetTrackToFollow(fTracks[fI]);
588 if (!fTrackToFollow.Propagate(det.GetPhi(),det.GetR())) {
7f6ddf58 589 //cerr<<"AliITStrackerV2::TakeNextProlongation: "
590 //"propagation failed !\n";
006b5f7f 591 continue;
592 }
4ab260d6 593 fTrackToFollow.SetDetectorIndex(idet);
594 if (TMath::Abs(fTrackToFollow.GetZ()-GetZ())>layer.GetR()+dz) continue;
006b5f7f 595
596#ifdef DEBUG
597cout<<fI<<" change detector !\n";
598#endif
599
600 }
601
4ab260d6 602 if (TMath::Abs(fTrackToFollow.GetZ() - c->GetZ()) > dz) continue;
603 if (TMath::Abs(fTrackToFollow.GetY() - c->GetY()) > dy) continue;
006b5f7f 604
4ab260d6 605 chi2=fTrackToFollow.GetPredictedChi2(c); if (chi2<kMaxChi2) break;
006b5f7f 606 }
607
608#ifdef DEBUG
4ab260d6 609cout<<fI<<" chi2="<<chi2<<' '
610 <<fTrackToFollow.GetY()<<' '<<fTrackToFollow.GetZ()<<' '
611 <<dy<<' '<<dz<<endl;
61ab8ea8 612{
613Double_t phi=TMath::ATan(fTrackToFollow.GetY()/fTrackToFollow.GetX())
614 +fTrackToFollow.GetAlpha(); phi=phi*180./3.141593;
615cout<<phi<<endl;
616}
006b5f7f 617#endif
618
619 if (chi2>=kMaxChi2) return 0;
620 if (!c) return 0;
621
006b5f7f 622 if (!fTrackToFollow.Update(c,chi2,(fI<<28)+ci)) {
7f6ddf58 623 //cerr<<"AliITStrackerV2::TakeNextProlongation: filtering failed !\n";
006b5f7f 624 return 0;
625 }
23efe5f1 626
4ab260d6 627 if (fTrackToFollow.GetNumberOfClusters()>1)
628 if (TMath::Abs(fTrackToFollow.GetD())>4) return 0;
629
a9a2d814 630 fTrackToFollow.
631 SetSampledEdx(c->GetQ(),fTrackToFollow.GetNumberOfClusters()-1); //b.b.
632
633 {
61ab8ea8 634 Double_t x0;
635 Double_t d=layer.GetThickness(fTrackToFollow.GetY(),fTrackToFollow.GetZ(),x0);
636 fTrackToFollow.CorrectForMaterial(d,x0);
a9a2d814 637 }
4ab260d6 638
a9a2d814 639 if (fConstraint[fPass]) {
4ab260d6 640 Double_t d=GetEffectiveThickness(0,0); //Think of this !!!!
641 fTrackToFollow.Improve(d,GetY(),GetZ());
a9a2d814 642 }
006b5f7f 643
644#ifdef DEBUG
645cout<<"accepted lab="<<c->GetLabel(0)<<' '
646 <<fTrackToFollow.GetNumberOfClusters()<<' '
a9a2d814 647 <<fTrackToFollow.GetY()<<' '<<fTrackToFollow.GetZ()<<' '
648 <<fTrackToFollow.Get1Pt()<<endl<<endl;
006b5f7f 649#endif
650
651 return 1;
652}
653
654
006b5f7f 655AliITStrackerV2::AliITSlayer::AliITSlayer() {
656 //--------------------------------------------------------------------
657 //default AliITSlayer constructor
658 //--------------------------------------------------------------------
659 fN=0;
660 fDetectors=0;
661}
662
663AliITStrackerV2::AliITSlayer::
664AliITSlayer(Double_t r,Double_t p,Double_t z,Int_t nl,Int_t nd) {
665 //--------------------------------------------------------------------
666 //main AliITSlayer constructor
667 //--------------------------------------------------------------------
668 fR=r; fPhiOffset=p; fZOffset=z;
669 fNladders=nl; fNdetectors=nd;
670 fDetectors=new AliITSdetector[fNladders*fNdetectors];
671
672 fN=0;
673 fI=0;
674}
675
676AliITStrackerV2::AliITSlayer::~AliITSlayer() {
677 //--------------------------------------------------------------------
678 // AliITSlayer destructor
679 //--------------------------------------------------------------------
680 delete[] fDetectors;
681 for (Int_t i=0; i<fN; i++) delete fClusters[i];
682}
683
61ab8ea8 684void AliITStrackerV2::AliITSlayer::ResetClusters() {
685 //--------------------------------------------------------------------
686 // This function removes loaded clusters
687 //--------------------------------------------------------------------
688 for (Int_t i=0; i<fN; i++) delete fClusters[i];
689 fN=0;
690 fI=0;
691}
692
006b5f7f 693Int_t AliITStrackerV2::AliITSlayer::InsertCluster(AliITSclusterV2 *c) {
694 //--------------------------------------------------------------------
695 //This function adds a cluster to this layer
696 //--------------------------------------------------------------------
697 if (fN==kMaxClusterPerLayer) {
a9a2d814 698 cerr<<"AliITStrackerV2::AliITSlayer::InsertCluster(): "
699 "Too many clusters !\n";
700 return 1;
006b5f7f 701 }
702
703 if (fN==0) {fClusters[fN++]=c; return 0;}
704 Int_t i=FindClusterIndex(c->GetZ());
705 memmove(fClusters+i+1 ,fClusters+i,(fN-i)*sizeof(AliITSclusterV2*));
706 fClusters[i]=c; fN++;
707
708 return 0;
709}
710
711Int_t AliITStrackerV2::AliITSlayer::FindClusterIndex(Double_t z) const {
712 //--------------------------------------------------------------------
713 // This function returns the index of the nearest cluster
714 //--------------------------------------------------------------------
715 if (fN==0) return 0;
716 if (z <= fClusters[0]->GetZ()) return 0;
717 if (z > fClusters[fN-1]->GetZ()) return fN;
718 Int_t b=0, e=fN-1, m=(b+e)/2;
719 for (; b<e; m=(b+e)/2) {
720 if (z > fClusters[m]->GetZ()) b=m+1;
721 else e=m;
722 }
723 return m;
724}
725
726void AliITStrackerV2::AliITSlayer::
727SelectClusters(Double_t zmin,Double_t zmax,Double_t ymin, Double_t ymax) {
728 //--------------------------------------------------------------------
729 // This function sets the "window"
730 //--------------------------------------------------------------------
731 fI=FindClusterIndex(zmin); fZmax=zmax;
14825d5a 732 Double_t circle=2*TMath::Pi()*fR;
733 if (ymax>circle) { ymax-=circle; ymin-=circle; }
006b5f7f 734 fYmin=ymin; fYmax=ymax;
735}
736
737const AliITSclusterV2 *AliITStrackerV2::AliITSlayer::GetNextCluster(Int_t &ci){
738 //--------------------------------------------------------------------
739 // This function returns clusters within the "window"
740 //--------------------------------------------------------------------
741 const AliITSclusterV2 *cluster=0;
742 for (Int_t i=fI; i<fN; i++) {
743 const AliITSclusterV2 *c=fClusters[i];
744 if (c->GetZ() > fZmax) break;
745 if (c->IsUsed()) continue;
746 const AliITSdetector &det=GetDetector(c->GetDetectorIndex());
747 Double_t y=fR*det.GetPhi() + c->GetY();
748
749 if (y>2.*fR*TMath::Pi()) y -= 2*fR*TMath::Pi();
750 if (y>1.*fR*TMath::Pi() && fYmax<y) y -= 2*fR*TMath::Pi();
751
752 if (y<fYmin) continue;
753 if (y>fYmax) continue;
754 cluster=c; ci=i;
755 fI=i+1;
756 break;
757 }
7f6ddf58 758
006b5f7f 759 return cluster;
760}
761
762Int_t AliITStrackerV2::AliITSlayer::
763FindDetectorIndex(Double_t phi, Double_t z) const {
764 //--------------------------------------------------------------------
765 //This function finds the detector crossed by the track
766 //--------------------------------------------------------------------
767 Double_t dphi=phi-fPhiOffset;
768 if (dphi < 0) dphi += 2*TMath::Pi();
769 else if (dphi >= 2*TMath::Pi()) dphi -= 2*TMath::Pi();
770 Int_t np=Int_t(dphi*fNladders*0.5/TMath::Pi()+0.5);
3e3e8427 771 if (np>=fNladders) np-=fNladders;
772 if (np<0) np+=fNladders;
006b5f7f 773
774 Double_t dz=fZOffset-z;
775 Int_t nz=Int_t(dz*(fNdetectors-1)*0.5/fZOffset+0.5);
3e3e8427 776 if (nz>=fNdetectors) return -1;
777 if (nz<0) return -1;
006b5f7f 778
779#ifdef DEBUG
780cout<<np<<' '<<nz<<endl;
781#endif
782
783 return np*fNdetectors + nz;
784}
785
786Double_t
61ab8ea8 787AliITStrackerV2::AliITSlayer::GetThickness(Double_t y,Double_t z,Double_t &x0)
788const {
a9a2d814 789 //--------------------------------------------------------------------
790 //This function returns the layer thickness at this point (units X0)
791 //--------------------------------------------------------------------
792 Double_t d=0.0085;
61ab8ea8 793 x0=21.82;
a9a2d814 794
795 if (43<fR&&fR<45) { //SSD2
61ab8ea8 796 Double_t dd=0.0034;
797 d=dd;
798 if (TMath::Abs(y-0.00)>3.40) d+=dd;
799 if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);}
800 if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);}
a9a2d814 801 for (Int_t i=0; i<12; i++) {
61ab8ea8 802 if (TMath::Abs(z-3.9*(i+0.5))<0.15) {
803 if (TMath::Abs(y-0.00)>3.40) d+=dd;
804 d+=0.0034;
805 break;
806 }
807 if (TMath::Abs(z+3.9*(i+0.5))<0.15) {
808 if (TMath::Abs(y-0.00)>3.40) d+=dd;
809 d+=0.0034;
810 break;
811 }
812 if (TMath::Abs(z-3.4-3.9*i)<0.50) {d+=(0.016-0.0034); break;}
813 if (TMath::Abs(z+0.5+3.9*i)<0.50) {d+=(0.016-0.0034); break;}
a9a2d814 814 }
815 } else
816 if (37<fR&&fR<41) { //SSD1
61ab8ea8 817 Double_t dd=0.0034;
818 d=dd;
819 if (TMath::Abs(y-0.00)>3.40) d+=dd;
820 if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);}
821 if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);}
a9a2d814 822 for (Int_t i=0; i<11; i++) {
61ab8ea8 823 if (TMath::Abs(z-3.9*i)<0.15) {
824 if (TMath::Abs(y-0.00)>3.40) d+=dd;
825 d+=dd;
826 break;
827 }
828 if (TMath::Abs(z+3.9*i)<0.15) {
829 if (TMath::Abs(y-0.00)>3.40) d+=dd;
830 d+=dd;
831 break;
832 }
833 if (TMath::Abs(z-1.85-3.9*i)<0.50) {d+=(0.016-0.0034); break;}
834 if (TMath::Abs(z+2.05+3.9*i)<0.50) {d+=(0.016-0.0034); break;}
a9a2d814 835 }
836 } else
837 if (13<fR&&fR<26) { //SDD
61ab8ea8 838 Double_t dd=0.0033;
839 d=dd;
840 if (TMath::Abs(y-0.00)>3.30) d+=dd;
841
842 if (TMath::Abs(y-1.80)<0.55) {
843 d+=0.016;
844 for (Int_t j=0; j<20; j++) {
845 if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;}
846 if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;}
847 }
848 }
849 if (TMath::Abs(y+1.80)<0.55) {
850 d+=0.016;
851 for (Int_t j=0; j<20; j++) {
852 if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;}
853 if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;}
854 }
855 }
856
857 for (Int_t i=0; i<4; i++) {
858 if (TMath::Abs(z-7.3*i)<0.60) {
859 d+=dd;
860 if (TMath::Abs(y-0.00)>3.30) d+=dd;
861 break;
862 }
863 if (TMath::Abs(z+7.3*i)<0.60) {
864 d+=dd;
865 if (TMath::Abs(y-0.00)>3.30) d+=dd;
866 break;
867 }
a9a2d814 868 }
869 } else
870 if (6<fR&&fR<8) { //SPD2
61ab8ea8 871 Double_t dd=0.0063; x0=21.5;
872 d=dd;
873 if (TMath::Abs(y-3.08)>0.5) d+=dd;
874 //if (TMath::Abs(y-3.08)>0.45) d+=dd;
875 if (TMath::Abs(y-3.03)<0.10) {d+=0.014;}
a9a2d814 876 } else
877 if (3<fR&&fR<5) { //SPD1
61ab8ea8 878 Double_t dd=0.0063; x0=21.5;
879 d=dd;
880 if (TMath::Abs(y+0.21)>0.6) d+=dd;
881 //if (TMath::Abs(y+0.21)>0.45) d+=dd;
882 if (TMath::Abs(y+0.10)<0.10) {d+=0.014;}
a9a2d814 883 }
884
61ab8ea8 885#ifdef DEBUG
886 cout<<"d="<<d<<endl;
887#endif
006b5f7f 888
a9a2d814 889 return d;
890}
006b5f7f 891
a9a2d814 892Double_t AliITStrackerV2::GetEffectiveThickness(Double_t y,Double_t z) const
006b5f7f 893{
894 //--------------------------------------------------------------------
a9a2d814 895 //Returns the thickness between the current layer and the vertex (units X0)
006b5f7f 896 //--------------------------------------------------------------------
61ab8ea8 897 Double_t d=0.0028*3*3; //beam pipe
898 Double_t x0=0;
006b5f7f 899
900 Double_t xn=fLayers[fI].GetR();
901 for (Int_t i=0; i<fI; i++) {
902 Double_t xi=fLayers[i].GetR();
61ab8ea8 903 d+=fLayers[i].GetThickness(y,z,x0)*xi*xi;
006b5f7f 904 }
905
906 if (fI>1) {
61ab8ea8 907 Double_t xi=9.;
908 d+=0.0097*xi*xi;
006b5f7f 909 }
910
911 if (fI>3) {
912 Double_t xi=0.5*(fLayers[3].GetR()+fLayers[4].GetR());
61ab8ea8 913 d+=0.0034*xi*xi;
006b5f7f 914 }
61ab8ea8 915
006b5f7f 916 return d/(xn*xn);
917}
918
006b5f7f 919Int_t AliITStrackerV2::AliITSlayer::InRoad() const {
920 //--------------------------------------------------------------------
921 // This function returns number of clusters within the "window"
922 //--------------------------------------------------------------------
923 Int_t ncl=0;
924 for (Int_t i=fI; i<fN; i++) {
925 const AliITSclusterV2 *c=fClusters[i];
926 if (c->GetZ() > fZmax) break;
a9a2d814 927 if (c->IsUsed()) continue;
006b5f7f 928 const AliITSdetector &det=GetDetector(c->GetDetectorIndex());
929 Double_t y=fR*det.GetPhi() + c->GetY();
930
931 if (y>2.*fR*TMath::Pi()) y -= 2*fR*TMath::Pi();
932 if (y>1.*fR*TMath::Pi() && fYmax<y) y -= 2*fR*TMath::Pi();
933
934 if (y<fYmin) continue;
935 if (y>fYmax) continue;
936 ncl++;
937 }
938 return ncl;
939}
940
4ab260d6 941Bool_t AliITStrackerV2::RefitAt(Double_t x, AliITStrackV2 *t, Int_t *index) {
942 //--------------------------------------------------------------------
943 // This function refits a track at a given position
944 //--------------------------------------------------------------------
945 Int_t from, to, step;
946 if (x > t->GetX()) {
947 from=0; to=kMaxLayer;
948 step=+1;
949 } else {
950 from=kMaxLayer-1; to=-1;
951 step=-1;
952 }
953
954 for (Int_t i=from; i != to; i += step) {
955 AliITSlayer &layer=fLayers[i];
956 Double_t r=layer.GetR();
957
958 {
959 Double_t hI=i-0.5*step;
960 if (hI==1.5 || hI==3.5) {
961 Double_t rs=0.5*(fLayers[i-step].GetR() + r);
61ab8ea8 962 Double_t d=0.0034, x0=38.6;
963 if (hI==1.5) {rs=9.; d=0.0097; x0=42;}
964 if (!t->PropagateTo(rs,d,x0)) {
4ab260d6 965 return kFALSE;
966 }
967 }
968 }
969
970 Double_t x,y,z;
971 if (!t->GetGlobalXYZat(r,x,y,z)) {
972 return kFALSE;
973 }
974 Double_t phi=TMath::ATan2(y,x);
975 Int_t idet=layer.FindDetectorIndex(phi,z);
976 if (idet<0) {
977 return kFALSE;
978 }
979 const AliITSdetector &det=layer.GetDetector(idet);
980 phi=det.GetPhi();
981 if (!t->Propagate(phi,det.GetR())) {
982 return kFALSE;
983 }
984 t->SetDetectorIndex(idet);
985
986 const AliITSclusterV2 *cl=0;
987 Double_t maxchi2=kMaxChi2;
988
989 Int_t idx=index[i];
990 if (idx>0) {
991 const AliITSclusterV2 *c=(AliITSclusterV2 *)GetCluster(idx);
992 if (idet != c->GetDetectorIndex()) {
993 idet=c->GetDetectorIndex();
994 const AliITSdetector &det=layer.GetDetector(idet);
995 if (!t->Propagate(det.GetPhi(),det.GetR())) {
996 return kFALSE;
997 }
998 t->SetDetectorIndex(idet);
999 }
1000 Double_t chi2=t->GetPredictedChi2(c);
1001 if (chi2<maxchi2) { cl=c; maxchi2=chi2; }
1002 else return kFALSE;
1003 }
1004
1005 /*
1006 if (cl==0)
1007 if (t->GetNumberOfClusters()>2) {
1008 Double_t dz=4*TMath::Sqrt(t->GetSigmaZ2()+kSigmaZ2[i]);
1009 Double_t dy=4*TMath::Sqrt(t->GetSigmaY2()+kSigmaY2[i]);
1010 Double_t zmin=t->GetZ() - dz;
1011 Double_t zmax=t->GetZ() + dz;
1012 Double_t ymin=t->GetY() + phi*r - dy;
1013 Double_t ymax=t->GetY() + phi*r + dy;
1014 layer.SelectClusters(zmin,zmax,ymin,ymax);
1015
1016 const AliITSclusterV2 *c=0; Int_t ci=-1;
1017 while ((c=layer.GetNextCluster(ci))!=0) {
1018 if (idet != c->GetDetectorIndex()) continue;
1019 Double_t chi2=t->GetPredictedChi2(c);
1020 if (chi2<maxchi2) { cl=c; maxchi2=chi2; idx=ci; }
1021 }
1022 }
1023 */
1024
1025 if (cl) {
1026 if (!t->Update(cl,maxchi2,idx)) {
1027 return kFALSE;
1028 }
1029 }
1030
1031 {
61ab8ea8 1032 Double_t x0;
1033 Double_t d=layer.GetThickness(t->GetY(),t->GetZ(),x0);
1034 t->CorrectForMaterial(-step*d,x0);
4ab260d6 1035 }
1036
1037 }
1038
1039 if (!t->PropagateTo(x,0.,0.)) return kFALSE;
1040 return kTRUE;
1041}
1042
006b5f7f 1043
1044