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1d9af2d5 1/**************************************************************************
2 * Copyright(c) 1998-2003, 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/* $Id$ */
17
18////////////////////////////////////////////////////
19// ITS Upgrade Stand alone tracker class //
20// Authors: A.Mastroserio C.Terrevoli //
21// e-mail:annalisa.mastroserio@cern.ch //
22// cristina.terrevoli@ba.infn.it //
23////////////////////////////////////////////////////
24
25#include <stdlib.h>
26
27#include <TArrayI.h>
28#include <TBranch.h>
29#include <TObjArray.h>
30#include <TTree.h>
31#include "AliRunLoader.h"
32#include "AliITSLoader.h"
33#include "AliESDEvent.h"
34#include "AliESDVertex.h"
35#include "AliESDtrack.h"
36#include "AliITSVertexer.h"
37#include "AliITSclusterTable.h"
0ac80088 38#include "AliITSRecPointU.h"
0b255a22 39#include "AliITStrackU.h"
1d9af2d5 40#include "AliITStrackerMI.h"
41#include "AliITSlayerUpgrade.h"
42#include "AliITSsegmentationUpgrade.h"
43#include "AliITStrackerUpgrade.h"
44#include "AliITSReconstructor.h"
45#include "AliLog.h"
46#include "AliRun.h"
47
48ClassImp(AliITStrackerUpgrade)
49
50//____________________________________________________________________________
556b741c 51 AliITStrackerUpgrade::AliITStrackerUpgrade():
52 AliITStrackerMI(),
53 fNLayers(), fPhiEstimate(0), fITSStandAlone(0), fLambdac(0),
54 fPhic(0), fCoef1(0), fCoef2(0), fCoef3(0), fNloop(0),
55 fPhiWin(0), fLambdaWin(0), fVert(0), fVertexer(0),
56 fListOfTracks(0), fListOfUTracks(0), fITSclusters(0),
57 fInwardFlag(0), fOuterStartLayer(0), fInnerStartLayer(0),
58 fMinNPoints(0), fMinQ(0), fTrackToFollow(), fLayers(0), fSegmentation(0x0),
59 fCluLayer(0), fCluCoord(0)
4211bbc5 60{
61 // Default constructor
62 Init();
665c0bc7 63
4211bbc5 64}
65//____________________________________________________________________________
556b741c 66AliITStrackerUpgrade::AliITStrackerUpgrade(Int_t nLay):
67 AliITStrackerMI(),
68 fNLayers(nLay), fPhiEstimate(0), fITSStandAlone(0), fLambdac(0),
69 fPhic(0), fCoef1(0), fCoef2(0), fCoef3(0), fNloop(0),
70 fPhiWin(0), fLambdaWin(0), fVert(0), fVertexer(0),
71 fListOfTracks(0), fListOfUTracks(0), fITSclusters(0),
72 fInwardFlag(0), fOuterStartLayer(0), fInnerStartLayer(nLay),
73 fMinNPoints(0), fMinQ(0), fTrackToFollow(), fLayers(0), fSegmentation(0x0),
74 fCluLayer(0), fCluCoord(0)
4211bbc5 75{
76 //
77 // constructor
78 //
79 Init();
1d9af2d5 80
4211bbc5 81}
1d9af2d5 82//____________________________________________________________________________
83AliITStrackerUpgrade::~AliITStrackerUpgrade(){
84 // destructor
85 // if fVertexer is not null, the AliESDVertex obj. is owned by this class
86 // and is deleted here
87 if(fVertexer){
88 if(fVert)delete fVert;
89 }
90 fVert = 0;
91 fVertexer = 0;
92
93 if(fPhiWin)delete []fPhiWin;
94 if(fLambdaWin)delete []fLambdaWin;
95 fListOfTracks->Delete();
96 delete fListOfTracks;
0b255a22 97 fListOfUTracks->Delete();
98 delete fListOfUTracks;
1d9af2d5 99 if(fCluLayer){
665c0bc7 100 for(Int_t i=0;i<fNLayers;i++){
1d9af2d5 101 if(fCluLayer[i]){
102 fCluLayer[i]->Delete();
103 delete fCluLayer[i];
104 }
105 }
106 delete [] fCluLayer;
107 }
108 if(fCluCoord){
665c0bc7 109 for(Int_t i=0;i<fNLayers;i++){
1d9af2d5 110 if(fCluCoord[i]){
111 fCluCoord[i]->Delete();
112 delete fCluCoord[i];
113 }
114 }
115 delete [] fCluCoord;
116 }
117
f059e2be 118 if(fSegmentation) delete fSegmentation;
1d9af2d5 119}
120
121//____________________________________________________________________________
122Int_t AliITStrackerUpgrade::Clusters2Tracks(AliESDEvent *event){
123 // This method is used to find and fit the tracks. By default the corresponding
124 // method in the parent class is invoked. In this way a combined tracking
125 // TPC+ITS is performed. If the flag fITSStandAlone is true, the tracking
126 // is done in the ITS only. In the standard reconstruction chain this option
127 // can be set via AliReconstruction::SetOption("ITS","onlyITS")
128 Int_t rc=0;
129 if(!fITSStandAlone){
9b615954 130 rc=AliITStrackerMI::Clusters2Tracks(event); // should not be used !!
131 // Note standalone tracking is implememted in "AliITStrackerU"
1d9af2d5 132 }
133 else {
134 AliDebug(1,"Stand Alone flag set: doing tracking in ITS alone\n");
135 }
136 if(!rc){
137 rc=FindTracks(event,kFALSE);
138 if(AliITSReconstructor::GetRecoParam()->GetSAUseAllClusters()==kTRUE) {
9b615954 139 rc=FindTracks(event,kTRUE); // eventually a 2nd time ??????
1d9af2d5 140 }
141 }
142 return rc;
143}
144//_________________________________________________-
145void AliITStrackerUpgrade::Init(){
146 // Reset all data members
665c0bc7 147 const Int_t nL = fNLayers;
1d9af2d5 148 fPhiEstimate=0;
3e1215c5 149 for(Int_t i=0;i<2;i++){fPoint1[i]=0;fPoint2[i]=0;fPoint3[i]=0;}
1d9af2d5 150 fLambdac=0;
151 fPhic=0;
152 fCoef1=0;
153 fCoef2=0;
154 fCoef3=0;
155 fPointc[0]=0;
156 fPointc[1]=0;
157 fVert = 0;
158 fVertexer = 0;
159 Int_t nLoops=AliITSReconstructor::GetRecoParam()->GetNLoopsSA();
160 if(nLoops==33){
161 SetFixedWindowSizes();
162 }else{
163 Double_t phimin=AliITSReconstructor::GetRecoParam()->GetMinPhiSA();
164 Double_t phimax=AliITSReconstructor::GetRecoParam()->GetMaxPhiSA();
165 Double_t lambmin=AliITSReconstructor::GetRecoParam()->GetMinLambdaSA();
166 Double_t lambmax=AliITSReconstructor::GetRecoParam()->GetMaxLambdaSA();
167 SetCalculatedWindowSizes(nLoops,phimin,phimax,lambmin,lambmax);
168 }
169 fMinQ=AliITSReconstructor::GetRecoParam()->GetSAMinClusterCharge();
170 fITSclusters = 0;
171 SetOuterStartLayer(1);
172 SetSAFlag(kFALSE);
4211bbc5 173 fListOfTracks=new TClonesArray("AliITStrackU",100);
0b255a22 174 fListOfUTracks=new TClonesArray("AliITStrackU",100);
665c0bc7 175 fLayers=new AliITSlayerUpgrade*[nL];//to be fixed
1d9af2d5 176 fCluLayer = 0;
177 fCluCoord = 0;
178 fMinNPoints = 3;
665c0bc7 179 for(Int_t layer=0; layer<fNLayers; layer++){
1d9af2d5 180 Double_t p=0.;
181 Double_t zC= 0.;
182 fLayers[layer] = new AliITSlayerUpgrade(p,zC);
183 }
184
db688ae2 185 fSegmentation = new AliITSsegmentationUpgrade();
1d9af2d5 186
187}
188//_______________________________________________________________________
189Int_t AliITStrackerUpgrade::LoadClusters(TTree *clusTree){
f059e2be 190 //
191 // Load clusters for tracking
192 //
8d499867 193
0ac80088 194 TClonesArray statITSCluster("AliITSRecPointU");
9e7c5dbf 195 TClonesArray *itsCluster = &statITSCluster;
8d499867 196
f059e2be 197 TBranch* itsClusterBranch=clusTree->GetBranch("ITSRecPoints");
198 if (!itsClusterBranch){
199 AliError("can't get the branch with the ITS clusters ! \n");
200 return 1;
201 }
9e7c5dbf 202 itsClusterBranch->SetAddress(&itsCluster);
f059e2be 203 clusTree->GetEvent(0);
9e7c5dbf 204 Int_t nCluster = itsCluster->GetEntriesFast();
f059e2be 205 for(Int_t i=0; i<nCluster; i++){
9e7c5dbf 206 AliITSRecPointU *recp = (AliITSRecPointU*)itsCluster->UncheckedAt(i);
0ac80088 207 fLayers[recp->GetLayer()]->InsertCluster(new AliITSRecPointU(*recp));
f059e2be 208 }//loop clusters
8d499867 209
1d9af2d5 210 SetClusterTree(clusTree);
211 return 0;
212}
213
214//_______________________________________________________
215void AliITStrackerUpgrade::ResetForFinding(){
216 // Reset data members used in all loops during track finding
217 fPhiEstimate=0;
3e1215c5 218 for(Int_t i=0;i<2;i++){fPoint1[i]=0;fPoint2[i]=0;fPoint3[i]=0;}
1d9af2d5 219 fLambdac=0;
220 fPhic=0;
221 fCoef1=0;
222 fCoef2=0;
223 fCoef3=0;
224 fPointc[0]=0;
225 fPointc[1]=0;
226 fListOfTracks->Clear();
0b255a22 227 fListOfUTracks->Clear();
1d9af2d5 228}
229
1d9af2d5 230//______________________________________________________________________
231Int_t AliITStrackerUpgrade::FindTracks(AliESDEvent* event,Bool_t useAllClusters){
232
233 // Track finder using the ESD object
234 AliDebug(2,Form(" field is %f",event->GetMagneticField()));
9b615954 235
1d9af2d5 236 if(!fITSclusters){
237 Fatal("FindTracks","ITS cluster tree is not accessed - Abort!!!\n Please use method SetClusterTree to pass the pointer to the tree\n");
238 return -1;
239 }
240
9b615954 241 // Reads event and mark clusters of tracks already found, with flag kITSin
1d9af2d5 242 Int_t nentr=event->GetNumberOfTracks();
243 if(!useAllClusters) {
244 while (nentr--) {
245 AliESDtrack *track=event->GetTrack(nentr);
246 if ((track->GetStatus()&AliESDtrack::kITSin) == AliESDtrack::kITSin){
247 Int_t idx[12];
248 Int_t ncl = track->GetITSclusters(idx);
249 for(Int_t k=0;k<ncl;k++){
0ac80088 250 AliITSRecPointU* cll = (AliITSRecPointU*)GetCluster(idx[k]);
1d9af2d5 251 cll->SetBit(kSAflag);
252 }
253 }
254 }
255 }else{
256 while (nentr--) {
257 AliESDtrack *track=event->GetTrack(nentr);
258 if ((track->GetStatus()&AliESDtrack::kITSin) == AliESDtrack::kITSin){
259 Int_t idx[12];
260 Int_t ncl = track->GetITSclusters(idx);
261 for(Int_t k=0;k<ncl;k++){
0ac80088 262 AliITSRecPointU* cll = (AliITSRecPointU*)GetCluster(idx[k]);
1d9af2d5 263 cll->ResetBit(kSAflag);
264 }
265 }
266 }
267 }
268 //Get primary vertex
269 Double_t primaryVertex[3];
270 event->GetVertex()->GetXYZ(primaryVertex);
4211bbc5 271 Int_t nclusters[fNLayers];
665c0bc7 272 for(Int_t i=0; i<fNLayers; i++){
0b255a22 273 nclusters[i]=0;
274 }
275
4211bbc5 276 Int_t dmar[fNLayers];
665c0bc7 277 for(Int_t i=0; i<fNLayers; i++){
0b255a22 278 dmar[i]=0;
279 }
280
1d9af2d5 281 if (fCluLayer == 0) {
665c0bc7 282 fCluLayer = new TClonesArray*[fNLayers];
283 fCluCoord = new TClonesArray*[fNLayers];
284 for(Int_t i=0;i<fNLayers;i++) {
1d9af2d5 285 fCluLayer[i]=0;
286 fCluCoord[i]=0;
287 }
288 }
665c0bc7 289 for(Int_t i=0;i<fNLayers;i++){
1d9af2d5 290 if (!ForceSkippingOfLayer(i)) {
291 for(Int_t cli=0;cli<fLayers[i]->GetNumberOfClusters();cli++){
0ac80088 292 AliITSRecPointU* cls = (AliITSRecPointU*)fLayers[i]->GetCluster(cli);
1d9af2d5 293 if(cls->TestBit(kSAflag)==kTRUE) continue; //clusters used by TPC prol.
294 if(cls->GetQ()==0) continue; //fake clusters dead zones
295 if(i>1 && cls->GetQ()<=fMinQ) continue; // cut on SDD and SSD cluster charge
296 nclusters[i]++;
297 }
298 }
299 dmar[i]=0;
300 if(!fCluLayer[i]){
0ac80088 301 fCluLayer[i] = new TClonesArray("AliITSRecPointU",nclusters[i]);
1d9af2d5 302 }else{
303 fCluLayer[i]->Delete();
304 fCluLayer[i]->Expand(nclusters[i]);
305 }
306 if(!fCluCoord[i]){
307 fCluCoord[i] = new TClonesArray("AliITSclusterTable",nclusters[i]);
308 }else{
309 fCluCoord[i]->Delete();
310 fCluCoord[i]->Expand(nclusters[i]);
311 }
312 }
665c0bc7 313 for(Int_t ilay=0;ilay<fNLayers;ilay++){
1d9af2d5 314 TClonesArray &clulay = *fCluLayer[ilay];
315 TClonesArray &clucoo = *fCluCoord[ilay];
316 if (!ForceSkippingOfLayer(ilay)){
f059e2be 317 AliDebug(2,Form("number of clusters in layer %i : %i",ilay,fLayers[ilay]->GetNumberOfClusters()));
1d9af2d5 318 for(Int_t cli=0;cli<fLayers[ilay]->GetNumberOfClusters();cli++){
0ac80088 319 AliITSRecPointU* cls = (AliITSRecPointU*)fLayers[ilay]->GetCluster(cli);
1d9af2d5 320 if(cls->TestBit(kSAflag)==kTRUE) continue;
321 if(cls->GetQ()==0) continue;
322 Double_t phi=0;Double_t lambda=0;
323 Double_t x=0;Double_t y=0;Double_t z=0;
324 Float_t sx=0;Float_t sy=0;Float_t sz=0;
325 GetCoorAngles(cls,phi,lambda,x,y,z,primaryVertex);
326 GetCoorErrors(cls,sx,sy,sz);
327 new (clulay[dmar[ilay]]) AliITSRecPoint(*cls);
328 new (clucoo[dmar[ilay]]) AliITSclusterTable(x,y,z,sx,sy,sz,phi,lambda,cli);
329 dmar[ilay]++;
330 }
db688ae2 331 } else AliDebug(2,Form("Force skipping layer %i",ilay));
1d9af2d5 332 }
333
334
335 // track counter
336 Int_t ntrack=0;
337
4211bbc5 338 static Int_t nClusLay[fgMaxNLayer];//counter for clusters on each layer
1d9af2d5 339 Int_t startLayForSeed=0;
340 Int_t lastLayForSeed=fOuterStartLayer;
341 Int_t nSeedSteps=lastLayForSeed-startLayForSeed;
342 Int_t seedStep=1;
343 if(fInwardFlag){
665c0bc7 344 startLayForSeed=fNLayers-1;
1d9af2d5 345 lastLayForSeed=fInnerStartLayer;
346 nSeedSteps=startLayForSeed-lastLayForSeed;
347 seedStep=-1;
348 }
349 // loop on minimum number of points
665c0bc7 350 for(Int_t iMinNPoints=fNLayers; iMinNPoints>=fMinNPoints; iMinNPoints--) {
1d9af2d5 351 // loop on starting layer for track finding
352 for(Int_t iSeedLay=0; iSeedLay<=nSeedSteps; iSeedLay++) {
353 Int_t theLay=startLayForSeed+iSeedLay*seedStep;
354 if(ForceSkippingOfLayer(theLay)) continue;
355 Int_t minNPoints=iMinNPoints-theLay;
665c0bc7 356 if(fInwardFlag) minNPoints=iMinNPoints-(fNLayers-1-theLay);
357 for(Int_t i=theLay+1;i<fNLayers;i++)
1d9af2d5 358 if(ForceSkippingOfLayer(i))
359 minNPoints--;
360 if(minNPoints<fMinNPoints) continue;
361
362 // loop on phi and lambda window size
363 for(Int_t nloop=0;nloop<fNloop;nloop++){
eaaed734 364 Int_t nclTheLay=fCluLayer[theLay]->GetEntriesFast();
1d9af2d5 365 while(nclTheLay--){
366 ResetForFinding();
367 Bool_t useRP=SetFirstPoint(theLay,nclTheLay,primaryVertex);
368 if(!useRP) continue;
665c0bc7 369 AliITStrackU trs(fNLayers);
1d9af2d5 370
371 Int_t pflag=0;
372 Int_t kk;
665c0bc7 373 for(kk=0;kk<fNLayers;kk++) nClusLay[kk] = 0;
1d9af2d5 374 kk=0;
375 nClusLay[kk] = SearchClusters(theLay,fPhiWin[nloop],fLambdaWin[nloop],
376 &trs,primaryVertex[2],pflag);
377 Int_t nextLay=theLay+seedStep;
dd290e92 378 if(nextLay<0){
379 AliWarning("Negative layer id. Please check!");
380 continue;
381 }
1d9af2d5 382 Bool_t goon=kTRUE;
383 while(goon){
384
385 kk++;
386 nClusLay[kk] = SearchClusters(nextLay,fPhiWin[nloop],fLambdaWin[nloop],
387 &trs,primaryVertex[2],pflag);
388 if(nClusLay[kk]!=0){
389
390 pflag=1;
391 if(kk==1) {
392 fPoint3[0]=fPointc[0];
393 fPoint3[1]=fPointc[1];
394 } else {
395 UpdatePoints();
396 }
397 }
398 nextLay+=seedStep;
665c0bc7 399 if(nextLay<0 || nextLay==fNLayers) goon=kFALSE;
1d9af2d5 400 }
401
402
403 Int_t layOK=0;
404 if(!fInwardFlag){
665c0bc7 405 for(Int_t nnp=0;nnp<fNLayers-theLay;nnp++){
1d9af2d5 406 if(nClusLay[nnp]!=0) layOK+=1;
407 }
408 }else{
409 for(Int_t nnp=theLay; nnp>=0; nnp--){
410 if(nClusLay[nnp]!=0) layOK+=1;
411 }
412 }
413 if(layOK>=minNPoints){
9b615954 414 // AliDebug(2,Form("---NPOINTS: %d; MAP: %d %d %d %d %d %d %d\n",layOK,nClusLay[0],nClusLay[1],nClusLay[2],nClusLay[3],nClusLay[4],nClusLay[5],nClusLay[6]));
1d9af2d5 415 AliITStrackV2* tr2 = 0;
416 Bool_t onePoint = kFALSE;
4211bbc5 417 tr2 = FitTrack(&trs,primaryVertex,onePoint);
418 if(!tr2){
419 continue;
420 }
9b615954 421 // AliDebug(2,Form("---NPOINTS fit: %d\n",tr2->GetNumberOfClusters()));
1d9af2d5 422
4211bbc5 423 StoreTrack(tr2,event,useAllClusters);
424 ntrack++;
425
426 }
1d9af2d5 427
428 }//end loop on clusters of theLay
429 } //end loop on window sizes
430 } //end loop on theLay
431 }//end loop on min points
432 if(!useAllClusters) AliInfo(Form("Number of found tracks: %d",event->GetNumberOfTracks()));
433
434 ResetForFinding();
435 return 0;
436
437}
438
439//________________________________________________________________________
440
0b255a22 441AliITStrackV2* AliITStrackerUpgrade::FitTrack(AliITStrackU* tr,Double_t *primaryVertex,Bool_t onePoint) {
1d9af2d5 442
0b255a22 443 const Int_t kMaxClu=AliITStrackU::kMaxNumberOfClusters;
1d9af2d5 444
4211bbc5 445 static Int_t clind[fgMaxNLayer][kMaxClu];
446 static Int_t clmark[fgMaxNLayer][kMaxClu];
447 static Int_t end[fgMaxNLayer];
0ac80088 448 static AliITSRecPointU *listlayer[fgMaxNLayer][kMaxClu];
556b741c 449 static Int_t indices[fgMaxNLayer];
450
4211bbc5 451 for(Int_t k=0;k<fgMaxNLayer; k++)end[k]=0;
1d9af2d5 452
665c0bc7 453 for(Int_t i=0;i<fNLayers;i++) {
1d9af2d5 454 for(Int_t j=0;j<kMaxClu; j++){
455 clind[i][j]=0;
456 clmark[i][j]=0;
457 listlayer[i][j]=0;
458 }
459 }
665c0bc7 460 Int_t inx[fNLayers];
461 for (Int_t k=0; k<fNLayers; k++) inx[k]=-1;
0b255a22 462 Int_t nclusters = tr->GetNumberOfClustersU();
1d9af2d5 463 for(Int_t ncl=0;ncl<nclusters;ncl++){
0b255a22 464 Int_t index = tr->GetClusterIndexU(ncl);
1d9af2d5 465 Int_t lay = (index & 0xf0000000) >> 28;
7dc6449a 466 //Int_t cli = index&0x0fffffff;
9e396337 467 //AliITSRecPoint* cl = (AliITSRecPoint*)fLayers[lay]->GetCluster(cli);
0ac80088 468 AliITSRecPointU* cl = (AliITSRecPointU*)GetCluster(index);
1d9af2d5 469 if(cl->TestBit(kSAflag)==kTRUE) cl->ResetBit(kSAflag);
470 inx[lay]=index;
471
472 Int_t nInLay=end[lay];
473 listlayer[lay][nInLay]=cl;
474 clind[lay][nInLay]=index;
475 end[lay]++;
476 }
477
665c0bc7 478 for(Int_t nlay=0;nlay<fNLayers;nlay++){
1d9af2d5 479 for(Int_t ncl=0;ncl<tr->GetNumberOfMarked(nlay);ncl++){
480 Int_t mark = tr->GetClusterMark(nlay,ncl);
481 clmark[nlay][ncl]=mark;
482 }
483 }
484
485
486 Int_t firstLay=-1,secondLay=-1;
665c0bc7 487 for(Int_t i=0;i<fNLayers;i++) {
1d9af2d5 488 if(end[i]==0) {
489 end[i]=1;
490 }else{
491 if(firstLay==-1) {
492 firstLay=i;
493 } else if(secondLay==-1) {
494 secondLay=i;
495 }
496 }
497 }
498
4211bbc5 499 //---adding initialization for non existent layers
500 for(Int_t i=fNLayers;i<fgMaxNLayer;i++) {
501 if(end[i]==0) {
502 end[i]=1;
503 }
504 }
505
506
507
1d9af2d5 508 if(firstLay==-1 || (secondLay==-1 && !onePoint)) return 0;
4211bbc5 509
0b255a22 510 TClonesArray &arrSA= *fListOfUTracks;
1d9af2d5 511 Int_t nFoundTracks=0;
512
4211bbc5 513
1d9af2d5 514 for(Int_t l0=0;l0<end[0];l0++){ //loop on layer 1
556b741c 515 indices[0]=l0;
1d9af2d5 516 for(Int_t l1=0;l1<end[1];l1++){ //loop on layer 2
556b741c 517 indices[1]=l1;
1d9af2d5 518 for(Int_t l2=0;l2<end[2];l2++){ //loop on layer 3
556b741c 519 indices[2]=l2;
1d9af2d5 520 for(Int_t l3=0;l3<end[3];l3++){ //loop on layer 4
556b741c 521 indices[3]=l3;
1d9af2d5 522 for(Int_t l4=0;l4<end[4];l4++){ //loop on layer 5
556b741c 523 indices[4]=l4;
1d9af2d5 524 for(Int_t l5=0;l5<end[5];l5++){ //loop on layer 6
556b741c 525 indices[5]=l5;
4211bbc5 526 for(Int_t l6=0;l6<end[6];l6++){//loop on layer 7
556b741c 527 indices[6]=l6;
4211bbc5 528 for(Int_t l7=0;l7<end[7];l7++){ //loop on layer 8
556b741c 529 indices[7]=l7;
530
531 Int_t iFirstLay=indices[firstLay];
532 Int_t mrk1=clmark[firstLay][iFirstLay];
533
4211bbc5 534 Double_t x1,y1,z1,sx1,sy1,sz1;
535 Double_t x2,y2,z2,sx2,sy2,sz2;
556b741c 536 AliITSRecPointU* p1=(AliITSRecPointU*)listlayer[firstLay][iFirstLay];
4211bbc5 537 Int_t layer = 0;
538 Double_t radius = 0.;
539 Double_t yclu1 = p1->GetY();
540 Double_t zclu1 = p1->GetZ();
541 layer=p1->GetLayer();
542 radius = fSegmentation->GetRadius(layer);
543 Double_t cv=0.,tgl2=0.,phi2=0.;
556b741c 544 AliITSclusterTable* arr1 = (AliITSclusterTable*)GetClusterCoord(firstLay,mrk1);
4211bbc5 545 x1 = arr1->GetX();
546 y1 = arr1->GetY();
547 z1 = arr1->GetZ();
548 sx1 = arr1->GetSx();
549 sy1 = arr1->GetSy();
550 sz1 = arr1->GetSz();
551
552 if(secondLay>0) {
556b741c 553 Int_t iSecondLay=indices[secondLay];
554 Int_t mrk2=clmark[secondLay][iSecondLay];
555 AliITSclusterTable* arr2 = (AliITSclusterTable*)GetClusterCoord(secondLay,mrk2);
4211bbc5 556 x2 = arr2->GetX();
557 y2 = arr2->GetY();
558 z2 = arr2->GetZ();
559 sx2 = arr2->GetSx();
560 sy2 = arr2->GetSy();
561 sz2 = arr2->GetSz();
562 cv = Curvature(primaryVertex[0],primaryVertex[1],x1,y1,x2,y2);
563 tgl2 = (z2-z1)/TMath::Sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1));
564 phi2 = TMath::ATan2((y2-y1),(x2-x1));
565 }
556b741c 566
4211bbc5 567 Double_t x,y,z = 0.;
568 Double_t xz[2];
556b741c 569 xz[0]= p1->GetDetLocalX();
570 xz[1]= p1->GetDetLocalZ();
571 fSegmentation->DetToGlobal(layer,p1->GetModule(),xz[0], xz[1],x,y,z);
4211bbc5 572
573
0ac80088 574 Double_t phiclrad;
4211bbc5 575 phiclrad=TMath::ATan2(y,x);
576 if (phiclrad<0) phiclrad+=TMath::TwoPi();
577 else if (phiclrad>=TMath::TwoPi()) phiclrad-=TMath::TwoPi();
578
556b741c 579 Double_t alpha = fSegmentation->GetAlpha(fSegmentation->GetModule(phiclrad));
317075a3 580
581 Int_t clIndice[fNLayers];
582 for (Int_t k=0; k<fNLayers; k++) clIndice[k]=-1;
0ac80088 583
4211bbc5 584 AliITStrackU trac(alpha,radius,yclu1,zclu1,phi2,tgl2,cv,1,fNLayers);
317075a3 585 for(Int_t iLay=fNLayers-1; iLay>=0; iLay--){
556b741c 586 Int_t iInLay=indices[iLay];
587 AliITSRecPointU* cl=(AliITSRecPointU*)listlayer[iLay][iInLay];
588 if(cl!=0){
589 trac.AddClusterV2(iLay,(clind[iLay][iInLay] & 0x0fffffff)>>0);
590 trac.AddClusterMark(iLay,clmark[iLay][iInLay]);
317075a3 591 clIndice[iLay] = clind[iLay][iInLay];
556b741c 592 }
4211bbc5 593 }
556b741c 594
4211bbc5 595 //fit with Kalman filter using RefitAtBase()
596 AliITStrackU ot(trac, kFALSE);
597 ot.ResetCovariance(10.);
598 ot.ResetClusters();
1d9af2d5 599
4211bbc5 600 // Propagate inside the innermost layer with a cluster
601 if(ot.Propagate(ot.GetX()-0.1*ot.GetX())) {
317075a3 602 if(RefitAtBase(AliITSRecoParam::GetrInsideITSscreen(),&ot,clIndice)){ //fit from layer 1 to layer N
4211bbc5 603 AliITStrackU otrack2(ot,kFALSE);
604 otrack2.ResetCovariance(10.);
605 otrack2.ResetClusters();
4211bbc5 606 //fit from last layer to layer 1
317075a3 607 if(RefitAtBase(fSegmentation->GetRadius(0)-0.1,&otrack2,clIndice)) {
4211bbc5 608 new(arrSA[nFoundTracks]) AliITStrackU(otrack2);
609 ++nFoundTracks;
610 }
1d9af2d5 611
4211bbc5 612 }
613 }
614
4211bbc5 615 }//end loop layer 8
616 }//end loop layer 7
1d9af2d5 617 }//end loop layer 6
618 }//end loop layer 5
619 }//end loop layer 4
620 }//end loop layer 3
621 }//end loop layer 2
622 }//end loop layer 1
623
624
625
626
4211bbc5 627 if(fListOfUTracks->GetEntries()==0) return 0;
1d9af2d5 628
629 Int_t lowchi2 = FindTrackLowChiSquare();
4211bbc5 630 AliITStrackU* otrack = (AliITStrackU*)fListOfUTracks->At(lowchi2);
631
1d9af2d5 632 if(otrack==0) {
633 return 0;
634 }
0a64515a 635
9b615954 636 // CookLabel(otrack,0.); //MI change - to see fake ratio
637 // printf(" label from CookLabel: %d \n ",otrack->GetLabel());
638
0a64515a 639 Int_t label=FindLabel(otrack);
640 otrack->SetLabel(label);
9b615954 641 // printf(" label from FindLabel: %d \n ",otrack->GetLabel());
0a64515a 642
665c0bc7 643 Int_t indexc[fNLayers];
644 for(Int_t i=0;i<fNLayers;i++) indexc[i]=0;
1d9af2d5 645 for(Int_t nind=0;nind<otrack->GetNumberOfClusters();nind++){
646 indexc[nind] = otrack->GetClusterIndex(nind);
647 }
9b615954 648
649
1d9af2d5 650 //remove clusters of found track
665c0bc7 651 for(Int_t nlay=0;nlay<fNLayers;nlay++){
4211bbc5 652 for(Int_t cln=0;cln<otrack->GetNumberOfMarked(nlay);cln++){
653 Int_t index = otrack->GetClusterMark(nlay,cln);
1d9af2d5 654 fCluLayer[nlay]->RemoveAt(index);
655 RemoveClusterCoord(nlay,index);
656 fCluLayer[nlay]->Compress();
657 }
658 }
9b615954 659
1d9af2d5 660 return otrack;
661
662}
663
664//_______________________________________________________
665void AliITStrackerUpgrade::StoreTrack(AliITStrackV2 *t,AliESDEvent *event, Bool_t pureSA) /*const*/
666{
667 //
668 // Add new track to the ESD
669 //
670 AliESDtrack outtrack;
671 outtrack.UpdateTrackParams(t,AliESDtrack::kITSin);
672 if(pureSA) outtrack.SetStatus(AliESDtrack::kITSpureSA);
673 outtrack.SetStatus(AliESDtrack::kITSout);
674 outtrack.SetStatus(AliESDtrack::kITSrefit);
675 Double_t sdedx[4]={0.,0.,0.,0.};
676 for(Int_t i=0; i<4; i++) sdedx[i]=t->GetSampledEdx(i);
677 outtrack.SetITSdEdxSamples(sdedx);
678 event->AddTrack(&outtrack);
679 return;
680}
681
682
683//_______________________________________________________
0b255a22 684Int_t AliITStrackerUpgrade::SearchClusters(Int_t layer,Double_t phiwindow,Double_t lambdawindow, AliITStrackU* trs,Double_t /*zvertex*/,Int_t pflag){
1d9af2d5 685 //function used to to find the clusters associated to the track
686
8d499867 687 AliDebug(2,"Starting...");
688 if(ForceSkippingOfLayer(layer)) {
f059e2be 689 AliDebug(2,Form("Forcing skipping of layer %i. Exiting",layer));
690 return 0;
8d499867 691 }
1d9af2d5 692
693 Int_t nc=0;
db688ae2 694 Double_t r=fSegmentation->GetRadius(layer);
1d9af2d5 695 if(pflag==1){
696 Float_t cx1,cx2,cy1,cy2;
697 FindEquation(fPoint1[0],fPoint1[1],fPoint2[0],fPoint2[1],fPoint3[0],fPoint3[1],fCoef1,fCoef2,fCoef3);
698 if (FindIntersection(fCoef1,fCoef2,fCoef3,-r*r,cx1,cy1,cx2,cy2)==0)
699 return 0;
700 Double_t fi1=TMath::ATan2(cy1-fPoint1[1],cx1-fPoint1[0]);
701 Double_t fi2=TMath::ATan2(cy2-fPoint1[1],cx2-fPoint1[0]);
702 fPhiEstimate=ChoosePoint(fi1,fi2,fPhic);
703 }
704
eaaed734 705
706 Double_t phiExpect=fPhiEstimate;
707 Double_t lamExpect=fLambdac;
708
709 Int_t ncl = fCluLayer[layer]->GetEntriesFast();
1d9af2d5 710 for (Int_t index=0; index<ncl; index++) {
eaaed734 711
1d9af2d5 712 AliITSclusterTable* arr = (AliITSclusterTable*)GetClusterCoord(layer,index);
1d9af2d5 713
714 Double_t lambda = arr->GetLambda();
eaaed734 715 if (TMath::Abs(lambda-lamExpect)>lambdawindow) continue;
716
717 Double_t phi = arr->GetPhi();
718 Double_t deltaPhi = phi-phiExpect;
719 if(deltaPhi>TMath::Pi()) deltaPhi-=2*TMath::Pi();
720 else if(deltaPhi<-TMath::Pi()) deltaPhi+=2*TMath::Pi();
721 if (TMath::Abs(deltaPhi)>phiwindow) continue;
1d9af2d5 722
0b255a22 723 if(trs->GetNumberOfClustersU()==trs->GetMaxNumberOfClusters()) return 0;
1d9af2d5 724 if(trs->GetNumberOfMarked(layer)==trs->GetMaxNMarkedPerLayer()) return 0;
725 Int_t orind = arr->GetOrInd();
0b255a22 726 trs->AddClusterU(layer,orind);
1d9af2d5 727 trs->AddClusterMark(layer,index);
1d9af2d5 728 nc++;
729 fLambdac=lambda;
730 fPhiEstimate=phi;
731
732 fPointc[0]=arr->GetX();
733 fPointc[1]=arr->GetY();
eaaed734 734
1d9af2d5 735 }
736 return nc;
eaaed734 737
1d9af2d5 738}
739
740//________________________________________________________________
741Bool_t AliITStrackerUpgrade::SetFirstPoint(Int_t lay, Int_t clu, Double_t* primaryVertex){
742 // Sets the first point (seed) for tracking
743
0ac80088 744 AliITSRecPointU* cl = (AliITSRecPointU*)fCluLayer[lay]->At(clu);
1d9af2d5 745 if(!cl) return kFALSE;
746 if (cl->GetQ()<=0) return kFALSE;
747 if(lay>1 && cl->GetQ()<=fMinQ) return kFALSE;
748 AliITSclusterTable* arr = (AliITSclusterTable*)GetClusterCoord(lay,clu);
749 fPhic = arr->GetPhi();
750 fLambdac = arr->GetLambda();
751 fPhiEstimate = fPhic;
752 fPoint1[0]=primaryVertex[0];
753 fPoint1[1]=primaryVertex[1];
754 fPoint2[0]=arr->GetX();
755 fPoint2[1]=arr->GetY();
756 return kTRUE;
757}
758
759//________________________________________________________________
760void AliITStrackerUpgrade::UpdatePoints(){
761 //update of points for the estimation of the curvature
762
763 fPoint2[0]=fPoint3[0];
764 fPoint2[1]=fPoint3[1];
765 fPoint3[0]=fPointc[0];
766 fPoint3[1]=fPointc[1];
1d9af2d5 767}
1d9af2d5 768//___________________________________________________________________
769Int_t AliITStrackerUpgrade::FindEquation(Float_t x1, Float_t y1, Float_t x2, Float_t y2, Float_t x3, Float_t y3,Float_t& a, Float_t& b, Float_t& c){
770
771 //given (x,y) of three recpoints (in global coordinates)
772 //returns the parameters a,b,c of circonference x*x + y*y +a*x + b*y +c
773
774 Float_t den = (x3-x1)*(y2-y1)-(x2-x1)*(y3-y1);
775 if(den==0) return 0;
776 a = ((y3-y1)*(x2*x2+y2*y2-x1*x1-y1*y1)-(y2-y1)*(x3*x3+y3*y3-x1*x1-y1*y1))/den;
777 b = -(x2*x2-x1*x1+y2*y2-y1*y1+a*(x2-x1))/(y2-y1);
778 c = -x1*x1-y1*y1-a*x1-b*y1;
779 return 1;
780}
781//__________________________________________________________________________
782Int_t AliITStrackerUpgrade::FindIntersection(Float_t a1, Float_t b1, Float_t c1, Float_t c2,Float_t& x1,Float_t& y1, Float_t& x2, Float_t& y2){
783
784 //Finds the intersection between the circonference of the track and the circonference centered in (0,0) represented by one layer
785 //c2 is -rlayer*rlayer
786
787 if(a1==0) return 0;
788 Double_t m = c2-c1;
789 Double_t aA = (b1*b1)/(a1*a1)+1;
790 Double_t bB = (-2*m*b1/(a1*a1));
791 Double_t cC = c2+(m*m)/(a1*a1);
792 Double_t dD = bB*bB-4*aA*cC;
793 if(dD<0) return 0;
794
795 y1 = (-bB+TMath::Sqrt(dD))/(2*aA);
796 y2 = (-bB-TMath::Sqrt(dD))/(2*aA);
797 x1 = (c2-c1-b1*y1)/a1;
798 x2 = (c2-c1-b1*y2)/a1;
799
800 return 1;
801}
802//____________________________________________________________________
803Double_t AliITStrackerUpgrade::Curvature(Double_t x1,Double_t y1,Double_t
804 x2,Double_t y2,Double_t x3,Double_t y3){
805
806 //calculates the curvature of track
807 Double_t den = (x3-x1)*(y2-y1)-(x2-x1)*(y3-y1);
808 if(den==0) return 0;
809 Double_t a = ((y3-y1)*(x2*x2+y2*y2-x1*x1-y1*y1)-(y2-y1)*(x3*x3+y3*y3-x1*x1-y1*y1))/den;
810 Double_t b = -(x2*x2-x1*x1+y2*y2-y1*y1+a*(x2-x1))/(y2-y1);
811 Double_t c = -x1*x1-y1*y1-a*x1-b*y1;
812 Double_t xc=-a/2.;
813
814 if((a*a+b*b-4*c)<0) return 0;
815 Double_t rad = TMath::Sqrt(a*a+b*b-4*c)/2.;
816 if(rad==0) return 0;
817
818 if((x1>0 && y1>0 && x1<xc)) rad*=-1;
819 if((x1<0 && y1>0 && x1<xc)) rad*=-1;
820 // if((x1<0 && y1<0 && x1<xc)) rad*=-1;
821 // if((x1>0 && y1<0 && x1<xc)) rad*=-1;
822
823 return 1/rad;
824
825}
1d9af2d5 826//____________________________________________________________________
827Double_t AliITStrackerUpgrade::ChoosePoint(Double_t p1, Double_t p2, Double_t pp){
828
829 //Returns the point closest to pp
830
831 Double_t diff1 = p1-pp;
832 Double_t diff2 = p2-pp;
833
834 if(TMath::Abs(diff1)<TMath::Abs(diff2)) fPhiEstimate=p1;
835 else fPhiEstimate=p2;
836 return fPhiEstimate;
837
838}
1d9af2d5 839//_________________________________________________________________
840Int_t AliITStrackerUpgrade::FindTrackLowChiSquare() const {
9e7c5dbf 841
1d9af2d5 842 // returns track with lowest chi square
9e7c5dbf 843
844Int_t dim=fListOfUTracks->GetEntries();
1d9af2d5 845 if(dim<=1) return 0;
4211bbc5 846 AliITStrackV2* trk = (AliITStrackV2*)fListOfUTracks->At(0);
9e7c5dbf 847 Double_t minChi2=trk->GetChi2()/trk->GetNumberOfClusters();
1d9af2d5 848 Int_t index=0;
849 for(Int_t i=1;i<dim;i++){
4211bbc5 850 trk = (AliITStrackV2*)fListOfUTracks->At(i);
9e7c5dbf 851 Double_t chi2=trk->GetChi2()/trk->GetNumberOfClusters();
1d9af2d5 852 if(chi2<minChi2){
853 minChi2=chi2;
854 index=i;
855 }
856 }
857 return index;
9e7c5dbf 858
1d9af2d5 859}
860
861//__________________________________________________________
0a64515a 862Int_t AliITStrackerUpgrade::FindLabel(AliITStrackV2* track) const {
863 //
9b615954 864 // max number of labels in AliITSRecPointU is 24;
865 enum {kMaxLab=24};
1d9af2d5 866
9b615954 867 Int_t labl[fNLayers][kMaxLab];
868 Int_t cnts[fNLayers][kMaxLab];
665c0bc7 869 for(Int_t j=0;j<fNLayers;j++){
9b615954 870 for(Int_t k=0;k<kMaxLab;k++){
0a64515a 871 labl[j][k]=-2;
872 cnts[j][k]=1;
873 }
874 }
875 Int_t iNotLabel=0;
876 for(Int_t i=0;i<track->GetNumberOfClusters(); i++) {
877 Int_t indexc = track->GetClusterIndex(i);
0ac80088 878 AliITSRecPointU* cl = (AliITSRecPointU*)GetCluster(indexc);
9b615954 879 // AliDebug(2,Form("Layer %d; cluster index %i; MClabels=(%d,%d,%d) ",
880 // cl->GetLayer(),indexc,cl->GetLabel(0),cl->GetLabel(1),cl->GetLabel(2)));
0a64515a 881 Int_t iLayer=cl->GetLayer();
9b615954 882 for(Int_t k=0;k<kMaxLab;k++){
883 labl[iLayer][k]=cl->GetTrackID(k);
0a64515a 884 if(labl[iLayer][k]<0) iNotLabel++;
885 }
886 }
9b615954 887 if(iNotLabel==kMaxLab*track->GetNumberOfClusters()) return -2; // No MC label found at all
0a64515a 888
665c0bc7 889 for(Int_t j1=0;j1<fNLayers; j1++) {
0a64515a 890 for(Int_t j2=0; j2<j1; j2++){
9b615954 891 for(Int_t k1=0; k1<kMaxLab; k1++){
892 for(Int_t k2=0; k2<kMaxLab; k2++){
0a64515a 893 if(labl[j1][k1]>=0 && labl[j1][k1]==labl[j2][k2] && cnts[j2][k2]>0){
894 cnts[j2][k2]++;
895 cnts[j1][k1]=0;
896 }
897 }
898 }
899 }
900 }
1d9af2d5 901
0a64515a 902
903 Int_t cntMax=0;
904 Int_t label=-1;
665c0bc7 905 for(Int_t j=0;j<fNLayers;j++){
9b615954 906 for(Int_t k=0;k<kMaxLab;k++){
0a64515a 907 if(cnts[j][k]>cntMax && labl[j][k]>=0){
908 cntMax=cnts[j][k];
909 label=labl[j][k];
910 }
911 }
912 }
913
914 Int_t lflag=0;
9b615954 915 for(Int_t i=0;i<fNLayers;i++) {
916 Bool_t labelOkInLayer = kFALSE;
917 for(Int_t k=0;k<kMaxLab;k++){
918 if (labl[i][k]==label) {
919 labelOkInLayer=kTRUE;
920 break;
921 }
922 }
923 if(labelOkInLayer) lflag++;
924 }
925 if(lflag<track->GetNumberOfClusters()) {
926 if (label==0) {
927 label = -1; // to avoid label 0 which can not be identified as as fake with -0
928 } else {
929 label = -label;
930 }
931 }
932 if (label<0) {
933 for(Int_t i=0;i<track->GetNumberOfClusters(); i++) {
934 Int_t indexc = track->GetClusterIndex(i);
935 AliITSRecPointU* cl = (AliITSRecPointU*)GetCluster(indexc);
936 AliDebug(2,Form("Layer %d; cluster index %i; MClabels=(%d,%d,%d...) ",
937 cl->GetLayer(),indexc,cl->GetTrackID(0),cl->GetTrackID(1),cl->GetTrackID(2)));
938 }
939 }
940
941
0a64515a 942 return label;
1d9af2d5 943}
9b615954 944
1d9af2d5 945//_____________________________________________________________________________
1d9af2d5 946void AliITStrackerUpgrade::SetCalculatedWindowSizes(Int_t n, Float_t phimin, Float_t phimax, Float_t lambdamin, Float_t lambdamax){
947 // Set sizes of the phi and lambda windows used for track finding
948 fNloop = n;
949 if(fPhiWin) delete [] fPhiWin;
950 if(fLambdaWin) delete [] fLambdaWin;
951 fPhiWin = new Double_t[fNloop];
952 fLambdaWin = new Double_t[fNloop];
953 Float_t stepPhi=(phimax-phimin)/(Float_t)(fNloop-1);
954 Float_t stepLambda=(lambdamax-lambdamin)/(Float_t)(fNloop-1);
955 for(Int_t k=0;k<fNloop;k++){
956 Float_t phi=phimin+k*stepPhi;
957 Float_t lam=lambdamin+k*stepLambda;
958 fPhiWin[k]=phi;
959 fLambdaWin[k]=lam;
960 }
961}
962//_____________________________________________________________________________
963void AliITStrackerUpgrade::SetFixedWindowSizes(Int_t n, Double_t *phi, Double_t *lam){
964 // Set sizes of the phi and lambda windows used for track finding
965 fNloop = n;
966 if(phi){ // user defined values
967 fPhiWin = new Double_t[fNloop];
968 fLambdaWin = new Double_t[fNloop];
969 for(Int_t k=0;k<fNloop;k++){
970 fPhiWin[k]=phi[k];
971 fLambdaWin[k]=lam[k];
972 }
973 }
974 else { // default values
975
976 Double_t phid[33] = {0.002,0.003,0.004,0.0045,0.0047,
977 0.005,0.0053,0.0055,
978 0.006,0.0063,0.0065,0.007,0.0073,0.0075,0.0077,
979 0.008,0.0083,0.0085,0.0087,0.009,0.0095,0.0097,
980 0.01,0.0105,0.011,0.0115,0.012,0.0125,0.013,0.0135,0.0140,0.0145};
981 Double_t lambdad[33] = {0.003,0.004,0.005,0.005,0.005,
982 0.005,0.005,0.006,
983 0.006,0.006,0.006,0.007,0.007,0.007,0.007,
984 0.007,0.007,0.007,0.007,0.007,0.007,0.007,
985 0.008,0.008,0.008,0.008,0.008,0.008,0.008,0.008,0.008,0.008};
986
987 if(fNloop!=33){
988 fNloop = 33;
989 }
990
991
992 fPhiWin = new Double_t[fNloop];
993 fLambdaWin = new Double_t[fNloop];
994
995 Double_t factor=AliITSReconstructor::GetRecoParam()->GetFactorSAWindowSizes();
996
997 for(Int_t k=0;k<fNloop;k++){
998 fPhiWin[k]=phid[k]*factor;
999 fLambdaWin[k]=lambdad[k]*factor;
1000 }
1001
1002 }
1003
1004}
1005//_______________________________________________________________________
0ac80088 1006void AliITStrackerUpgrade::GetCoorAngles(AliITSRecPointU* cl,Double_t &phi,Double_t &lambda, Double_t &x, Double_t &y,Double_t &z,Double_t* vertex){
1d9af2d5 1007 //Returns values of phi (azimuthal) and lambda angles for a given cluster
1d9af2d5 1008
1009 Double_t xz[2];
1010 xz[0]= cl->GetDetLocalX();
1011 xz[1]= cl->GetDetLocalZ() ;
1d9af2d5 1012 Int_t ilayer;
1013 ilayer = cl->GetLayer();
556b741c 1014 fSegmentation->DetToGlobal(ilayer,cl->GetModule(),xz[0], xz[1],x,y,z);
1d9af2d5 1015
1016 if(x!=0 && y!=0)
1017 phi=TMath::ATan2(y-vertex[1],x-vertex[0]);
1018 lambda=TMath::ATan2(z-vertex[2],TMath::Sqrt((x-vertex[0])*(x-vertex[0])+(y-vertex[1])*(y-vertex[1])));
1019}
1020
1021//________________________________________________________________________
0ac80088 1022void AliITStrackerUpgrade::GetCoorErrors(AliITSRecPointU* cl,Float_t &sx,Float_t &sy, Float_t &sz){
1d9af2d5 1023
1024 //returns sigmax, y, z of cluster in global coordinates
1025 /*
1026 Double_t rot[9]; fGeom->GetRotMatrix(module,rot);
1027 Int_t lay,lad,det;
1028 AliITSgeomTGeo::GetModuleId(module,lay,lad,det);
1029
1030 Double_t alpha=TMath::ATan2(rot[1],rot[0])+TMath::Pi();
1031 Double_t phi=TMath::Pi()/2+alpha;
1032 if (lay==1) phi+=TMath::Pi();
1033
1034 Float_t cp=TMath::Cos(phi), sp=TMath::Sin(phi);
1035 */
1036 Float_t covm[6];
1037 cl->GetGlobalCov(covm);
1038 sx=TMath::Sqrt(covm[0]);
1039 sy=TMath::Sqrt(covm[3]);
1040 sz=TMath::Sqrt(covm[5]);
1041
1042
1043
1044 // Float_t covm[6];
1045 // cl->GetGlobalCov(covm);
1046 // sx=12*1e-04;//TMath::Sqrt(covm[0]);
1047 // sy=12*1e-04;//TMath::Sqrt(covm[3]);
1048 // sz=40*1e-04;//TMath::Sqrt(covm[5]);
1049 /*
1050 sx = TMath::Sqrt(sp*sp*cl->GetSigmaY2());
1051 sy = TMath::Sqrt(cp*cp*cl->GetSigmaY2());
1052 sz = TMath::Sqrt(cl->GetSigmaZ2());
1053 */
1054}
1055//_____________________________________________________________
1056void AliITStrackerUpgrade::UnloadClusters() {
1057 //--------------------------------------------------------------------
1058 //This function unloads ITS clusters
1059 //--------------------------------------------------------------------
665c0bc7 1060 for (Int_t i=0; i<fNLayers; i++) fLayers[i]->ResetClusters();
1d9af2d5 1061}
1062//______________________________________________________________________
4211bbc5 1063Bool_t AliITStrackerUpgrade::RefitAtBase(Double_t xx,AliITStrackU *track,
1d9af2d5 1064 const Int_t *clusters)
1065{
1066 //--------------------------------------------------------------------
1067 // Simplified version for ITS upgrade studies -- does not use module info
1068 //--------------------------------------------------------------------
665c0bc7 1069 Int_t index[fNLayers];
1d9af2d5 1070 Int_t k;
665c0bc7 1071 for (k=0; k<fNLayers; k++) index[k]=-1;
1d9af2d5 1072 //
665c0bc7 1073 for (k=0; k<fNLayers; k++) {
1d9af2d5 1074 index[k]=clusters[k];
1075 }
1d9af2d5 1076
1077 ULong_t trStatus=0;
1078 if(track->GetESDtrack()) trStatus=track->GetStatus();
1079 Int_t innermostlayer=0;
1080 if(trStatus&AliESDtrack::kTPCin) {
665c0bc7 1081 innermostlayer=fNLayers-1;
1d9af2d5 1082 Double_t drphi = TMath::Abs(track->GetD(0.,0.));
665c0bc7 1083 for(innermostlayer=0; innermostlayer<fNLayers; innermostlayer++) {
db688ae2 1084 if( (drphi < (fSegmentation->GetRadius(innermostlayer)+1.)) ||
1d9af2d5 1085 index[innermostlayer] >= 0 ) break;
1086 }
1087 AliDebug(2,Form(" drphi %f innermost %d",drphi,innermostlayer));
1088 }
1089
1090 Int_t from, to, step;
1091 if (xx > track->GetX()) {
665c0bc7 1092 from=innermostlayer; to=fNLayers;
1d9af2d5 1093 step=+1;
1094 } else {
665c0bc7 1095 from=fNLayers-1; to=innermostlayer-1;
1d9af2d5 1096 step=-1;
1097 }
1098 TString dir = (step>0 ? "outward" : "inward");
1099
1100 for (Int_t ilayer = from; ilayer != to; ilayer += step) {
1101 Double_t r=0.;
db688ae2 1102 r=fSegmentation->GetRadius(ilayer);
1d9af2d5 1103
1104 if (step<0 && xx>r){
1105 break;
1106 }
1107
1d9af2d5 1108
1109 Double_t oldGlobXYZ[3];
1110
1111 if (!track->GetXYZ(oldGlobXYZ)) {
1112 return kFALSE;
1113 }
1114 // continue if we are already beyond this layer
1115 Double_t oldGlobR = TMath::Sqrt(oldGlobXYZ[0]*oldGlobXYZ[0]+oldGlobXYZ[1]*oldGlobXYZ[1]);
1116 if(step>0 && oldGlobR > r){
1117 continue; // going outward
1118 }
1119 if(step<0 && oldGlobR < r) {
1120 continue; // going inward
1121 }
1122 Double_t phi,z;
1123 if (!track->GetPhiZat(r,phi,z)){
1124 return kFALSE;
556b741c 1125 } // only for ITS-SA tracks refit
1d9af2d5 1126 track->SetCheckInvariant(kFALSE);
1127
1128 if (phi<0) phi+=TMath::TwoPi();//from 0 to 360 (rad)
1129 else if (phi>=TMath::TwoPi()) phi-=TMath::TwoPi();//
0ac80088 1130
9b615954 1131 Int_t trkModule = fSegmentation->GetModule(phi);
1132
1133 Double_t alpha = fSegmentation->GetAlpha(trkModule);
1d9af2d5 1134 if (!track->Propagate(alpha,r)) {
1d9af2d5 1135 return kFALSE;
1136 }
1137
0ac80088 1138 const AliITSRecPointU *clAcc=0;
1d9af2d5 1139 Double_t maxchi2=1000.*AliITSReconstructor::GetRecoParam()->GetMaxChi2();
1140
1141 Int_t idx=index[ilayer];
1142 if (idx>=0) { // cluster in this layer
1143 Int_t cli = idx&0x0fffffff;
9b615954 1144 AliITSRecPointU *cl=(AliITSRecPointU *)fLayers[ilayer]->GetCluster(cli);
1d9af2d5 1145
1146 if (cl) {
1147 Int_t cllayer = (idx & 0xf0000000) >> 28;;
9b615954 1148 // edge effect correction
9b615954 1149 if(trkModule!=cl->GetModule()){
1150 if (!track->Propagate(fSegmentation->GetAlpha(cl->GetModule()),fSegmentation->GetRadius(ilayer))) return kFALSE;
1151 }
1d9af2d5 1152 Double_t chi2=GetPredictedChi2MI(track,cl,cllayer);
1153 if (chi2<maxchi2) {
1154 clAcc=cl;
1155 maxchi2=chi2;
1156 } else {
f059e2be 1157 return kFALSE;
1d9af2d5 1158 }
1159 }
1160 }
1161
1162 if (clAcc) {
1163 if (!UpdateMI(track,clAcc,maxchi2,idx)){
1164 return kFALSE;
1165 }
1166 track->SetSampledEdx(clAcc->GetQ(),ilayer-2);
1167 }
1168
1169
1170 // Correct for material of the current layer
1171 // cross material
1172 // add time if going outward
1173 if(!CorrectForLayerMaterial(track,ilayer,oldGlobXYZ,dir)){
1174 return kFALSE;
1175 }
1176 track->SetCheckInvariant(kFALSE);
1177 } // end loop on layers
1178
1179 if (!track->PropagateTo(xx,0.,0.)){
1180 return kFALSE;
8d499867 1181 }
556b741c 1182
1d9af2d5 1183 return kTRUE;
1184}
1185
1186//_____________________________________________________________________
0ac80088 1187Int_t AliITStrackerUpgrade::UpdateMI(AliITStrackU* track, const AliITSRecPointU* cl,Double_t chi2,Int_t index) const
1d9af2d5 1188{
1189 //
1190 // Update ITS track
1191 //
1192 Int_t layer = (index & 0xf0000000) >> 28;
1193 track->SetClIndex(layer, index);
1194 if (TMath::Abs(cl->GetQ())<1.e-13) return 0; // ingore the "virtual" clusters
1195
1196
1197 // Take into account the mis-alignment (bring track to cluster plane)
1198 Double_t xTrOrig=track->GetX();
1199 Double_t trxyz[3]; track->GetXYZ(trxyz);
1200 Float_t xclu1 = cl->GetX();//upgrade clusters tracking coordinate
1201 //Float_t yclu1 = cl->GetY();
1202 //Float_t zclu1 = cl->GetZ();
1203 if (!track->Propagate(xTrOrig+xclu1)){
1204 return 0;
1205 }
1206 AliCluster c(*cl);
1207 c.SetSigmaY2(track->GetSigmaY(layer)*track->GetSigmaY(layer));
1208 c.SetSigmaZ2(track->GetSigmaZ(layer)*track->GetSigmaZ(layer));
1209 c.SetSigmaYZ(track->GetSigmaYZ(layer));
1210
1211 // Bring the track back to detector plane in ideal geometry
1212 Int_t updated = track->UpdateMI(&c,chi2,index);
1213 if (!track->Propagate(xTrOrig)) {
1214 return 0;
1215 }
1216 if(!updated){
1217 AliDebug(2,"update failed");
1218 }
1219 return updated;
1220}
1221//____________________________________________________________________-
4211bbc5 1222Int_t AliITStrackerUpgrade::CorrectForLayerMaterial(AliITStrackU *t,
1d9af2d5 1223 Int_t layerindex,
1224 Double_t oldGlobXYZ[3],
1225 TString direction) {
1226 //-------------------------------------------------------------------
1227 // Propagate beyond layer and correct for material
1228 // (material budget in different ways according to fUseTGeo value)
1229 // Add time if going outward (PropagateTo or PropagateToTGeo)
1230 //-------------------------------------------------------------------
1231
1232 // Define budget mode:
1233 // 0: material from AliITSRecoParam (hard coded)
1234 // 1: material from TGeo in stepsof X cm (on the fly)
1235 // X = AliITSRecoParam::GetStepSizeTGeo()
1236 // 2: material from lut
1237 // 3: material from TGeo in one step (same for all hypotheses)
1238 Int_t mode;
1239 switch(fUseTGeo) {
1240 case 0:
1241 mode=0;
1242 break;
1243 case 1:
1244 mode=1;
1245 break;
1246 case 2:
1247 mode=2;
1248 break;
1249 case 3:
1250 if(fTrackingPhase.Contains("Clusters2Tracks"))
1251 { mode=3; } else { mode=1; }
1252 break;
1253 case 4:
1254 if(fTrackingPhase.Contains("Clusters2Tracks"))
1255 { mode=3; } else { mode=2; }
1256 break;
1257 default:
1258 mode=0;
1259 break;
1260 }
1261 if(fTrackingPhase.Contains("Default")) {
1262 mode=0;
1263 }
1264 Float_t dir = (direction.Contains("inward") ? 1. : -1.);
317075a3 1265 //Double_t r = fSegmentation->GetRadius(layerindex);
1266 //Double_t deltar=(layerindex<2 ? 0.10*r : 0.05*r);
1267 Double_t deltar=0.05;
1d9af2d5 1268 Double_t rToGo=TMath::Sqrt(t->GetX()*t->GetX()+t->GetY()*t->GetY())-deltar*dir;
1269 Double_t xToGo;
1270 if (!t->GetLocalXat(rToGo,xToGo)) {
1271 return 0;
1272 }
665c0bc7 1273 Int_t index=fNLayers*fCurrentEsdTrack+layerindex;
1d9af2d5 1274
1d9af2d5 1275 Double_t xOverX0=0.0,x0=0.0,lengthTimesMeanDensity=0.0;
1276 Int_t nsteps=1;
1277 // back before material (no correction)
1278 Double_t rOld,xOld;
1279 rOld=TMath::Sqrt(oldGlobXYZ[0]*oldGlobXYZ[0]+oldGlobXYZ[1]*oldGlobXYZ[1]);
1280 if (!t->GetLocalXat(rOld,xOld)) return 0;
1281 if (!t->Propagate(xOld)) return 0;
1282
1283 switch(mode) {
1284 case 1:
1285 x0=21.82;
db688ae2 1286 xOverX0 = fSegmentation->GetThickness(layerindex)/x0;
1d9af2d5 1287
1288 lengthTimesMeanDensity = xOverX0*x0;
1289 lengthTimesMeanDensity *= dir;
1290 // Bring the track beyond the material
1291 if (!t->PropagateTo(xToGo,xOverX0,lengthTimesMeanDensity/xOverX0)){
1292 return 0;
1293 }
1294 break;
1295 case 0:
1296 nsteps = (Int_t)(TMath::Abs(xOld-xToGo)/AliITSReconstructor::GetRecoParam()->GetStepSizeTGeo())+1;
1297 if (!t->PropagateToTGeo(xToGo,nsteps)) return 0; // cross the material and apply correction
1298 break;
1299 case 2:
1300 if(fxOverX0Layer[layerindex]<0) BuildMaterialLUT("Layers");
1301 xOverX0 = fxOverX0Layer[layerindex];
1302 lengthTimesMeanDensity = fxTimesRhoLayer[layerindex];
1303 lengthTimesMeanDensity *= dir;
1304 // Bring the track beyond the material
1305 if (!t->PropagateTo(xToGo,xOverX0,lengthTimesMeanDensity/xOverX0)) return 0;
1306 break;
1307 case 3:
665c0bc7 1308 if(!fxOverX0LayerTrks || index<0 || index>=fNLayers*fNtracks) Error("CorrectForLayerMaterial","Incorrect usage of UseTGeo option!\n");
1d9af2d5 1309 if(fxOverX0LayerTrks[index]<0) {
1310 nsteps = (Int_t)(TMath::Abs(xOld-xToGo)/AliITSReconstructor::GetRecoParam()->GetStepSizeTGeo())+1;
1311 if (!t->PropagateToTGeo(xToGo,nsteps,xOverX0,lengthTimesMeanDensity)) return 0;
1312 Double_t angle=TMath::Sqrt((1.+t->GetTgl()*t->GetTgl())/
1313 ((1.-t->GetSnp())*(1.+t->GetSnp())));
1314 fxOverX0LayerTrks[index] = TMath::Abs(xOverX0)/angle;
1315 fxTimesRhoLayerTrks[index] = TMath::Abs(lengthTimesMeanDensity)/angle;
1316 return 1;
1317 }
1318 xOverX0 = fxOverX0LayerTrks[index];
1319 lengthTimesMeanDensity = fxTimesRhoLayerTrks[index];
1320 lengthTimesMeanDensity *= dir;
1321 // Bring the track beyond the material
1322 if (!t->PropagateTo(xToGo,xOverX0,lengthTimesMeanDensity/xOverX0)){
1323 return 0;
1324 }
1325 break;
1326 }
1327
1328
1329 return 1;
1330}
1331
1332
1333//_____________________________________________________________________________
0ac80088 1334Double_t AliITStrackerUpgrade::GetPredictedChi2MI(AliITStrackU* track, const AliITSRecPointU *cluster,Int_t layer)
1d9af2d5 1335{
1336 //
1337 // Compute predicted chi2
1338 //
1339 Float_t erry,errz,covyz;
1340 Float_t theta = track->GetTgl();
1341 Float_t phi = track->GetSnp();
1342 phi = TMath::Abs(phi)*TMath::Sqrt(1./((1.-phi)*(1.+phi)));
1343 GetError(layer,cluster,theta,phi,track->GetExpQ(),erry,errz,covyz);
9b615954 1344 AliDebug(3,Form(" chi2: tr-cl %f %f tr X %f cl X %f",track->GetY()-cluster->GetY(),track->GetZ()-cluster->GetZ(),track->GetX(),cluster->GetX()));
1d9af2d5 1345 // Take into account the mis-alignment (bring track to cluster plane)
1346 Double_t xTrOrig=track->GetX();
1347 if (!track->Propagate(xTrOrig+cluster->GetX())) return 1000.;
9b615954 1348 AliDebug(3,Form(" chi2: tr-cl %f %f tr X %f cl X %f",track->GetY()-cluster->GetY(),track->GetZ()-cluster->GetZ(),track->GetX(),cluster->GetX()));
1d9af2d5 1349 Double_t chi2 = track->GetPredictedChi2MI(cluster->GetY(),cluster->GetZ(),erry,errz,covyz);
1350 // Bring the track back to detector plane in ideal geometry
1351 // [mis-alignment will be accounted for in UpdateMI()]
1352 if (!track->Propagate(xTrOrig)) return 1000.;
1353 Float_t ny=0.,nz=0.;
1354 //GetNTeor(layer,cluster,theta,phi,ny,nz);
1355 Double_t delta = cluster->GetNy()+cluster->GetNz()-nz-ny;
1356 if (delta>1){
1357 chi2+=0.5*TMath::Min(delta/2,2.);
1358 chi2+=2.*cluster->GetDeltaProbability();
1359 }
1360 //
1361 track->SetNy(layer,ny);
1362 track->SetNz(layer,nz);
1363 track->SetSigmaY(layer,erry);
1364 track->SetSigmaZ(layer, errz);
1365 track->SetSigmaYZ(layer,covyz);
4211bbc5 1366
1d9af2d5 1367 track->SetNormQ(layer,cluster->GetQ()/TMath::Sqrt((1.+ track->GetTgl()*track->GetTgl())/((1.-track->GetSnp())*(1.+track->GetSnp()))));
1368 return chi2;
1369}
1370//________________________________________________________________
1371Int_t AliITStrackerUpgrade::GetError(Int_t /*layer*/,
0ac80088 1372 const AliITSRecPointU *cl,
1d9af2d5 1373 Float_t /*tgl*/,Float_t /*tgphitr*/,Float_t /*expQ*/,
1374 Float_t &erry,Float_t &errz,Float_t &covyz,
1375 Bool_t /*addMisalErr*/)
1376{
1377 //
1378 // Calculate cluster position error for the upgrade
1379 //
1380 Int_t retval=0;
1381 covyz=0.;
1382 retval = GetErrorOrigRecPoint(cl,erry,errz,covyz);
1383
1384
1385
1386 return retval;
1387
1388}
1389//____________________________________________________________________-
1390
0ac80088 1391Int_t AliITStrackerUpgrade::GetErrorOrigRecPoint(const AliITSRecPointU *cl,
1d9af2d5 1392 Float_t &erry,Float_t &errz,Float_t &covyz)
1393{
1394 //
1395 // Calculate cluster position error (just take error from AliITSRecPoint)
1396 //
1397 erry = TMath::Sqrt(cl->GetSigmaY2());
1398 errz = TMath::Sqrt(cl->GetSigmaZ2());
1399 covyz = cl->GetSigmaYZ();
1400 return 1;
1401}
1402//__________________________
9b615954 1403//void AliITStrackerUpgrade::GetNTeor(Int_t layer,const AliITSRecPointU* /*cl*/,
1404/* Float_t tgl,Float_t tgphitr,
1d9af2d5 1405 Float_t &ny,Float_t &nz)
1406{
1407 //
1408 // Get "mean shape" (original parametrization from AliITStrackerMI)
1409 //
1410 tgl = TMath::Abs(tgl);
1411 tgphitr = TMath::Abs(tgphitr);
1412
1413 // SPD
1414 if (layer==0) {
1415 ny = 1.+tgphitr*3.2;
1416 nz = 1.+tgl*0.34;
1417 return;
1418 }
1419 if (layer==1) {
1420 ny = 1.+tgphitr*3.2;
1421 nz = 1.+tgl*0.28;
1422 return;
1423 }
1424 // SSD
1425 if (layer==4 || layer==5) {
1426 ny = 2.02+tgphitr*1.95;
1427 nz = 2.02+tgphitr*2.35;
1428 return;
1429 }
1430 // SDD
1431 ny = 6.6-2.7*tgphitr;
1432 nz = 2.8-3.11*tgphitr+0.45*tgl;
1433 return;
9b615954 1434 }*/
1435
1d9af2d5 1436//_________________________________________________________________
1437Int_t AliITStrackerUpgrade::PropagateBack(AliESDEvent *event) {
1438 //--------------------------------------------------------------------
1439 // This functions propagates reconstructed ITS tracks back
1440 // The clusters must be loaded !
1441 //--------------------------------------------------------------------
1442 fTrackingPhase="PropagateBack";
1443 Int_t nentr=event->GetNumberOfTracks();
1444 Info("PropagateBack", "Number of ESD tracks: %d\n", nentr);
1445 Int_t ntrk=0;
1446 for (Int_t i=0; i<nentr; i++) {
1447 AliESDtrack *esd=event->GetTrack(i);
1448
1449 if ((esd->GetStatus()&AliESDtrack::kITSin)==0) continue;
1450 if (esd->GetStatus()&AliESDtrack::kITSout) continue;
1451
f059e2be 1452 /*
1453 AliITStrackMI *t=0;
1454 try {
1d9af2d5 1455 t=new AliITStrackMI(*esd);
f059e2be 1456 } catch (const Char_t *msg) {
1d9af2d5 1457 //Warning("PropagateBack",msg);
1458 delete t;
1459 continue;
f059e2be 1460 }
1461 */
4211bbc5 1462 AliITStrackU *t = new AliITStrackU(*esd);
1d9af2d5 1463 t->SetExpQ(TMath::Max(0.8*t->GetESDtrack()->GetTPCsignal(),30.));
1464
1465 ResetTrackToFollow(*t);
1466
1467 /*
1468 // propagate to vertex [SR, GSI 17.02.2003]
1469 // Start Time measurement [SR, GSI 17.02.2003], corrected by I.Belikov
1470 if (CorrectForPipeMaterial(&fTrackToFollow,"inward")) {
1471 if (fTrackToFollow.PropagateToVertex(event->GetVertex()))
1472 fTrackToFollow.StartTimeIntegral();
1473 // from vertex to outside pipe
1474 CorrectForPipeMaterial(&fTrackToFollow,"outward");
1475 }*/
1476 // Start time integral and add distance from current position to vertex
1477 Double_t xyzTrk[3],xyzVtx[3]={GetX(),GetY(),GetZ()};
1478 fTrackToFollow.GetXYZ(xyzTrk);
1479 Double_t dst2 = 0.;
1480 for (Int_t icoord=0; icoord<3; icoord++) {
1481 Double_t di = xyzTrk[icoord] - xyzVtx[icoord];
1482 dst2 += di*di;
1483 }
1484 fTrackToFollow.StartTimeIntegral();
1485 fTrackToFollow.AddTimeStep(TMath::Sqrt(dst2));
1486
1487 fTrackToFollow.ResetCovariance(10.);
1488 fTrackToFollow.ResetClusters();
1489 //
665c0bc7 1490 Int_t inx[fNLayers];
1491 for (Int_t k=0; k<fNLayers; k++) inx[k]=-1;
1d9af2d5 1492 Int_t nclusters = t->GetNumberOfClusters();
1493 for(Int_t ncl=0;ncl<nclusters;ncl++){
1494 Int_t index = t-> GetClIndex(ncl);
1495 Int_t lay = (index & 0xf0000000) >> 28;
1496 inx[lay]=index;
1497 }
1498 //
665c0bc7 1499 if (RefitAtBase(fSegmentation->GetRadius(fNLayers-1),&fTrackToFollow,inx)) {
1d9af2d5 1500 //fTrackToFollow.SetLabel(t->GetLabel());//
1501 //fTrackToFollow.CookdEdx();
1502 //CookLabel(&fTrackToFollow,0.); //For comparison only
1503 fTrackToFollow.UpdateESDtrack(AliESDtrack::kITSout);
db688ae2 1504 //UseClusters(&fTrackToFollow);
1d9af2d5 1505 ntrk++;
1506 }
1507 delete t;
1508 }
1509
1d9af2d5 1510 fTrackingPhase="Default";
1511
1512 return 0;
1513}
1514//_________________________________________________________________________
1515AliCluster *AliITStrackerUpgrade::GetCluster(Int_t index) const {
1516 //--------------------------------------------------------------------
1517 // Return pointer to a given cluster
1518 //--------------------------------------------------------------------
1519 Int_t l=(index & 0xf0000000) >> 28;
0a64515a 1520 Int_t c=(index & 0x0fffffff) >> 0;
9b615954 1521
1522 AliCluster *cl = fLayers[l]->GetCluster(c);
1523
1524 // AliDebug(2,Form("index %i; cluster index %i; layer %i; Pointer to cluster:%p", index,c,l,cl));
1525
1526 return cl;
1d9af2d5 1527}
1528//______________________________________________________________________________
4211bbc5 1529Int_t AliITStrackerUpgrade::CorrectForPipeMaterial(AliITStrackU *t, TString direction) {
f059e2be 1530 //-------------------------------------------------------------------
1531 // Propagate beyond beam pipe and correct for material
1532 // (material budget in different ways according to fUseTGeo value)
1533 // Add time if going outward (PropagateTo or PropagateToTGeo)
1534 //-------------------------------------------------------------------
1535
1536 // Define budget mode:
1537 // 0: material from AliITSRecoParam (hard coded)
1538 // 1: material from TGeo in one step (on the fly)
1539 // 2: material from lut
1540 // 3: material from TGeo in one step (same for all hypotheses)
1541 Int_t mode;
1542 switch(fUseTGeo) {
1543 case 0:
1544 mode=0;
1545 break;
1546 case 1:
1547 mode=1;
1548 break;
1549 case 2:
1550 mode=2;
1551 break;
1552 case 3:
1553 if(fTrackingPhase.Contains("Clusters2Tracks"))
1554 { mode=3; } else { mode=1; }
1555 break;
1556 case 4:
1557 if(fTrackingPhase.Contains("Clusters2Tracks"))
1558 { mode=3; } else { mode=2; }
1559 break;
1560 default:
1561 mode=0;
1562 break;
1563 }
1564 if(fTrackingPhase.Contains("Default")) mode=0;
1565 Int_t index=fCurrentEsdTrack;
1566
1567 Float_t dir = (direction.Contains("inward") ? 1. : -1.);
1568 Double_t rToGo=(dir>0 ? AliITSRecoParam::GetrInsidePipe() : AliITSRecoParam::GetrOutsidePipe());
1569 Double_t xToGo;
1570 if (!t->GetLocalXat(rToGo,xToGo)) return 0;
1571
1572 Double_t xOverX0,x0,lengthTimesMeanDensity;
1573
1574 switch(mode) {
1575 case 0:
1576 xOverX0 = AliITSRecoParam::GetdPipe();
1577 x0 = AliITSRecoParam::GetX0Be();
1578 lengthTimesMeanDensity = xOverX0*x0;
1579 lengthTimesMeanDensity *= dir;
1580 if (!t->PropagateTo(xToGo,xOverX0,lengthTimesMeanDensity/xOverX0)) return 0;
1581 break;
1582 case 1:
1583 if (!t->PropagateToTGeo(xToGo,1)) return 0;
1584 break;
1585 case 2:
1586 if(fxOverX0Pipe<0) BuildMaterialLUT("Pipe");
1587 xOverX0 = fxOverX0Pipe;
1588 lengthTimesMeanDensity = fxTimesRhoPipe;
1589 lengthTimesMeanDensity *= dir;
1590 if (!t->PropagateTo(xToGo,xOverX0,lengthTimesMeanDensity/xOverX0)) return 0;
1591 break;
1592 case 3:
1593 if(!fxOverX0PipeTrks || index<0 || index>=fNtracks) Error("CorrectForPipeMaterial","Incorrect usage of UseTGeo option!\n");
1594 if(fxOverX0PipeTrks[index]<0) {
1595 if (!t->PropagateToTGeo(xToGo,1,xOverX0,lengthTimesMeanDensity)) return 0;
1596 Double_t angle=TMath::Sqrt((1.+t->GetTgl()*t->GetTgl())/
1597 ((1.-t->GetSnp())*(1.+t->GetSnp())));
1598 fxOverX0PipeTrks[index] = TMath::Abs(xOverX0)/angle;
1599 fxTimesRhoPipeTrks[index] = TMath::Abs(lengthTimesMeanDensity)/angle;
1600 return 1;
1601 }
1602 xOverX0 = fxOverX0PipeTrks[index];
1603 lengthTimesMeanDensity = fxTimesRhoPipeTrks[index];
1604 lengthTimesMeanDensity *= dir;
1605 if (!t->PropagateTo(xToGo,xOverX0,lengthTimesMeanDensity/xOverX0)) return 0;
1606 break;
1607 }
1608
1609 return 1;
1d9af2d5 1610}
1611//__________________________________________________________________________
1612Int_t AliITStrackerUpgrade::RefitInward(AliESDEvent *event) {
1613 //--------------------------------------------------------------------
1614 // This functions refits ITS tracks using the
1615 // "inward propagated" TPC tracks
1616 // The clusters must be loaded !
1617 //--------------------------------------------------------------------
1618 fTrackingPhase="RefitInward";
1619 Int_t nentr=event->GetNumberOfTracks();
1620 for (Int_t i=0; i<nentr; i++) {
1621 AliESDtrack *esd=event->GetTrack(i);
1622
1623 // if ((esd->GetStatus()&AliESDtrack::kITSout) == 0) continue;
1624 // if (esd->GetStatus()&AliESDtrack::kITSrefit) continue;
1625 //if (esd->GetStatus()&AliESDtrack::kTPCout)
1626 // if ((esd->GetStatus()&AliESDtrack::kTPCrefit)==0) continue;
4211bbc5 1627 AliITStrackU *t=0;
1d9af2d5 1628 try {
4211bbc5 1629 t=new AliITStrackU(*esd);
1d9af2d5 1630 } catch (const Char_t *msg) {
1631 //Warning("RefitInward",msg);
1632 delete t;
1633 continue;
1634 }
1635
1636 ResetTrackToFollow(*t);
1637 // fTrackToFollow.ResetClusters();
1638 // if ((esd->GetStatus()&AliESDtrack::kTPCin)==0)
1639 // fTrackToFollow.ResetCovariance(10.);
1640 //Refitting...
1641 //The beam pipe
f059e2be 1642 if (CorrectForPipeMaterial(&fTrackToFollow,"inward")) {
1643 fTrackToFollow.UpdateESDtrack(AliESDtrack::kITSrefit);
1644 AliESDtrack *esdTrack =fTrackToFollow.GetESDtrack();
1645 Double_t r[3]={0.,0.,0.};
1646 Double_t maxD=3.;
1647 esdTrack->RelateToVertex(event->GetVertex(),GetBz(r),maxD);
1648 }
1d9af2d5 1649 delete t;
1650 }
1651
1652 fTrackingPhase="Default";
1653 return 0;
1654}
1655
1656
1657