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Macro to add the energy distribution task to the train
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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// Stand alone ITS tracker class //
20// Origin: Elisabetta Crescio - crescio@to.infn.it //
21// Updated: Francesco Prino - prino@to.infn.it //
22///////////////////////////////////////////////////////////
23
24#include <stdlib.h>
25
26#include <TArrayI.h>
27#include <TBranch.h>
28#include <TObjArray.h>
29#include <TTree.h>
30
31#include "AliESDEvent.h"
32#include "AliESDVertex.h"
33#include "AliESDtrack.h"
34#include "AliITSVertexer.h"
35#include "AliITSclusterTable.h"
36#include "AliITSRecPoint.h"
37#include "AliITSgeomTGeo.h"
38#include "AliITStrackSA.h"
39#include "AliITStrackerSA.h"
40#include "AliITSReconstructor.h"
41#include "AliLog.h"
42#include "AliRun.h"
43
44ClassImp(AliITStrackerSA)
45
46//____________________________________________________________________________
47AliITStrackerSA::AliITStrackerSA():AliITStrackerMI(),
48fPhiEstimate(0),
49fITSStandAlone(0),
50fLambdac(0),
51fPhic(0),
52fCoef1(0),
53fCoef2(0),
54fCoef3(0),
55fNloop(0),
56fPhiWin(0),
57fLambdaWin(0),
58fVert(0),
59fVertexer(0),
60fListOfTracks(0),
61fListOfSATracks(0),
62fITSclusters(0),
63fInwardFlag(0),
64fOuterStartLayer(0),
65fInnerStartLayer(5),
66fMinNPoints(0),
67fMinQ(0.),
68fCluLayer(0),
69fCluCoord(0){
70 // Default constructor
71 Init();
72
73}
74//____________________________________________________________________________
75AliITStrackerSA::AliITStrackerSA(const Char_t *geom):AliITStrackerMI(0),
76fPhiEstimate(0),
77fITSStandAlone(0),
78fLambdac(0),
79fPhic(0),
80fCoef1(0),
81fCoef2(0),
82fCoef3(0),
83fNloop(0),
84fPhiWin(0),
85fLambdaWin(0),
86fVert(0),
87fVertexer(0),
88fListOfTracks(0),
89fListOfSATracks(0),
90fITSclusters(0),
91fInwardFlag(0),
92fOuterStartLayer(0),
93fInnerStartLayer(5),
94fMinNPoints(0),
95fMinQ(0.),
96fCluLayer(0),
97fCluCoord(0)
98{
99 // Standard constructor (Vertex is known and passed to this obj.)
100 if (geom) {
101 AliWarning("\"geom\" is actually a dummy argument !");
102 }
103
104 Init();
105 fVert = 0;
106
107}
108
109//____________________________________________________________________________
110AliITStrackerSA::AliITStrackerSA(const Char_t *geom, AliESDVertex *vert):AliITStrackerMI(0),
111fPhiEstimate(0),
112fITSStandAlone(0),
113fLambdac(0),
114fPhic(0),
115fCoef1(0),
116fCoef2(0),
117fCoef3(0),
118fNloop(0),
119fPhiWin(0),
120fLambdaWin(0),
121fVert(vert),
122fVertexer(0),
123fListOfTracks(0),
124fListOfSATracks(0),
125fITSclusters(0),
126fInwardFlag(0),
127fOuterStartLayer(0),
128fInnerStartLayer(5),
129fMinNPoints(0),
130fMinQ(0.),
131fCluLayer(0),
132fCluCoord(0)
133{
134 // Standard constructor (Vertex is known and passed to this obj.)
135 if (geom) {
136 AliWarning("\"geom\" is actually a dummy argument !");
137 }
138 Init();
139
140}
141
142//____________________________________________________________________________
143AliITStrackerSA::AliITStrackerSA(const Char_t *geom, AliITSVertexer *vertexer):AliITStrackerMI(0),
144fPhiEstimate(0),
145fITSStandAlone(0),
146fLambdac(0),
147fPhic(0),
148fCoef1(0),
149fCoef2(0),
150fCoef3(0),
151fNloop(0),
152fPhiWin(0),
153fLambdaWin(0),
154fVert(),
155fVertexer(vertexer),
156fListOfTracks(0),
157fListOfSATracks(0),
158fITSclusters(0),
159fInwardFlag(0),
160fOuterStartLayer(0),
161fInnerStartLayer(5),
162fMinNPoints(0),
163fMinQ(0.),
164fCluLayer(0),
165fCluCoord(0)
166{
167 // Standard constructor (Vertex is unknown - vertexer is passed to this obj)
168 if (geom) {
169 AliWarning("\"geom\" is actually a dummy argument !");
170 }
171 Init();
172 fVertexer = vertexer;
173
174}
175
176//____________________________________________________________________________
177AliITStrackerSA::AliITStrackerSA(const AliITStrackerSA& tracker):AliITStrackerMI(),
178fPhiEstimate(tracker.fPhiEstimate),
179fITSStandAlone(tracker.fITSStandAlone),
180fLambdac(tracker.fLambdac),
181fPhic(tracker.fPhic),
182fCoef1(tracker.fCoef1),
183fCoef2(tracker.fCoef2),
184fCoef3(tracker.fCoef3),
185fNloop(tracker.fNloop),
186fPhiWin(tracker.fPhiWin),
187fLambdaWin(tracker.fLambdaWin),
188fVert(tracker.fVert),
189fVertexer(tracker.fVertexer),
190fListOfTracks(tracker.fListOfTracks),
191fListOfSATracks(tracker.fListOfSATracks),
192fITSclusters(tracker.fITSclusters),
193fInwardFlag(tracker.fInwardFlag),
194fOuterStartLayer(tracker.fOuterStartLayer),
195fInnerStartLayer(tracker.fInnerStartLayer),
196fMinNPoints(tracker.fMinNPoints),
197fMinQ(tracker.fMinQ),
198fCluLayer(tracker.fCluLayer),
199fCluCoord(tracker.fCluCoord) {
200 // Copy constructor
201 for(Int_t i=0;i<2;i++){
202 fPoint1[i]=tracker.fPoint1[i];
203 fPoint2[i]=tracker.fPoint2[i];
204 fPoint3[i]=tracker.fPoint3[i];
205 fPointc[i]=tracker.fPointc[i];
206 }
207 if(tracker.fVertexer && tracker.fVert){
208 fVert = new AliESDVertex(*tracker.fVert);
209 }
210 else {
211 fVert = tracker.fVert;
212 }
213 for(Int_t i=0;i<AliITSgeomTGeo::GetNLayers();i++){
214 fCluLayer[i] = tracker.fCluLayer[i];
215 fCluCoord[i] = tracker.fCluCoord[i];
216 }
217}
218//______________________________________________________________________
219AliITStrackerSA& AliITStrackerSA::operator=(const AliITStrackerSA& source){
220 // Assignment operator.
221 this->~AliITStrackerSA();
222 new(this) AliITStrackerSA(source);
223 return *this;
224
225}
226
227//____________________________________________________________________________
228AliITStrackerSA::~AliITStrackerSA(){
229 // destructor
230 // if fVertexer is not null, the AliESDVertex obj. is owned by this class
231 // and is deleted here
232 if(fVertexer){
233 if(fVert)delete fVert;
234 }
235 fVert = 0;
236 fVertexer = 0;
237
238 if(fPhiWin)delete []fPhiWin;
239 if(fLambdaWin)delete []fLambdaWin;
240 fListOfTracks->Delete();
241 delete fListOfTracks;
242 fListOfSATracks->Delete();
243 delete fListOfSATracks;
244 if(fCluLayer){
245 for(Int_t i=0;i<AliITSgeomTGeo::GetNLayers();i++){
246 if(fCluLayer[i]){
247 fCluLayer[i]->Delete();
248 delete fCluLayer[i];
249 }
250 }
251 delete [] fCluLayer;
252 }
253 if(fCluCoord){
254 for(Int_t i=0;i<AliITSgeomTGeo::GetNLayers();i++){
255 if(fCluCoord[i]){
256 fCluCoord[i]->Delete();
257 delete fCluCoord[i];
258 }
259 }
260 delete [] fCluCoord;
261 }
262
263}
264
265//____________________________________________________________________________
266Int_t AliITStrackerSA::Clusters2Tracks(AliESDEvent *event){
267// This method is used to find and fit the tracks. By default the corresponding
268// method in the parent class is invoked. In this way a combined tracking
269// TPC+ITS is performed. If the flag fITSStandAlone is true, the tracking
270// is done in the ITS only. In the standard reconstruction chain this option
271// can be set via AliReconstruction::SetOption("ITS","onlyITS")
272 Int_t rc=0;
273
274 if(!fITSStandAlone){
275 rc=AliITStrackerMI::Clusters2Tracks(event);
276 }
277 else {
278 AliDebug(1,"Stand Alone flag set: doing tracking in ITS alone\n");
279 }
280 if(!rc){
281 rc=FindTracks(event,kFALSE);
282 Int_t nSPDcontr=0;
283 const AliESDVertex *spdv = event->GetPrimaryVertexSPD();
284 if(spdv) nSPDcontr = spdv->GetNContributors();
285 if(AliITSReconstructor::GetRecoParam()->GetSAUseAllClusters()==kTRUE &&
286 nSPDcontr<=AliITSReconstructor::GetRecoParam()->GetMaxSPDcontrForSAToUseAllClusters()) {
287 rc=FindTracks(event,kTRUE);
288 }
289 }
290 return rc;
291}
292
293//____________________________________________________________________________
294void AliITStrackerSA::Init(){
295 // Reset all data members
296 fPhiEstimate=0;
297 for(Int_t i=0;i<3;i++){fPoint1[i]=0;fPoint2[i]=0;fPoint3[i]=0;}
298 fLambdac=0;
299 fPhic=0;
300 fCoef1=0;
301 fCoef2=0;
302 fCoef3=0;
303 fPointc[0]=0;
304 fPointc[1]=0;
305 fVert = 0;
306 fVertexer = 0;
307 Int_t nLoops=AliITSReconstructor::GetRecoParam()->GetNLoopsSA();
308 if(nLoops==33){
309 SetFixedWindowSizes();
310 }else{
311 Double_t phimin=AliITSReconstructor::GetRecoParam()->GetMinPhiSA();
312 Double_t phimax=AliITSReconstructor::GetRecoParam()->GetMaxPhiSA();
313 Double_t lambmin=AliITSReconstructor::GetRecoParam()->GetMinLambdaSA();
314 Double_t lambmax=AliITSReconstructor::GetRecoParam()->GetMaxLambdaSA();
315 SetCalculatedWindowSizes(nLoops,phimin,phimax,lambmin,lambmax);
316 }
317 fMinQ=AliITSReconstructor::GetRecoParam()->GetSAMinClusterCharge();
318 fITSclusters = 0;
319 SetOuterStartLayer(1);
320 SetSAFlag(kFALSE);
321 fListOfTracks=new TClonesArray("AliITStrackMI",100);
322 fListOfSATracks=new TClonesArray("AliITStrackSA",100);
323 fCluLayer = 0;
324 fCluCoord = 0;
325 fMinNPoints = 3;
326 }
327//_______________________________________________________________________
328void AliITStrackerSA::ResetForFinding(){
329 // Reset data members used in all loops during track finding
330 fPhiEstimate=0;
331 for(Int_t i=0;i<3;i++){fPoint1[i]=0;fPoint2[i]=0;fPoint3[i]=0;}
332 fLambdac=0;
333 fPhic=0;
334 fCoef1=0;
335 fCoef2=0;
336 fCoef3=0;
337 fPointc[0]=0;
338 fPointc[1]=0;
339 fListOfTracks->Clear();
340 fListOfSATracks->Clear();
341}
342
343
344
345//______________________________________________________________________
346Int_t AliITStrackerSA::FindTracks(AliESDEvent* event, Bool_t useAllClusters){
347
348// Track finder using the ESD object
349
350 AliDebug(2,Form(" field is %f",event->GetMagneticField()));
351 AliDebug(2,Form("SKIPPING %d %d %d %d %d %d",ForceSkippingOfLayer(0),ForceSkippingOfLayer(1),ForceSkippingOfLayer(2),ForceSkippingOfLayer(3),ForceSkippingOfLayer(4),ForceSkippingOfLayer(5)));
352
353 if(!fITSclusters){
354 Fatal("FindTracks","ITS cluster tree is not accessed - Abort!!!\n Please use method SetClusterTree to pass the pointer to the tree\n");
355 return -1;
356 }
357 //Reads event and mark clusters of traks already found, with flag kITSin
358 Int_t nentr=event->GetNumberOfTracks();
359 if(!useAllClusters) {
360 while (nentr--) {
361 AliESDtrack *track=event->GetTrack(nentr);
362 if ((track->GetStatus()&AliESDtrack::kITSin) == AliESDtrack::kITSin){
363 Int_t idx[12];
364 Int_t ncl = track->GetITSclusters(idx);
365 for(Int_t k=0;k<ncl;k++){
366 AliITSRecPoint* cll = (AliITSRecPoint*)GetCluster(idx[k]);
367 cll->SetBit(kSAflag);
368 }
369 }
370 }
371 }else{
372 while (nentr--) {
373 AliESDtrack *track=event->GetTrack(nentr);
374 if ((track->GetStatus()&AliESDtrack::kITSin) == AliESDtrack::kITSin){
375 Int_t idx[12];
376 Int_t ncl = track->GetITSclusters(idx);
377 for(Int_t k=0;k<ncl;k++){
378 AliITSRecPoint* cll = (AliITSRecPoint*)GetCluster(idx[k]);
379 cll->ResetBit(kSAflag);
380 }
381 }
382 }
383 }
384 //Get primary vertex
385 Double_t primaryVertex[3];
386 event->GetVertex()->GetXYZ(primaryVertex);
387 //Creates TClonesArray with clusters for each layer. The clusters already used
388 //by AliITStrackerMI are not considered
389 Int_t nclusters[AliITSgeomTGeo::kNLayers]={0,0,0,0,0,0};
390 Int_t dmar[AliITSgeomTGeo::kNLayers]={0,0,0,0,0,0};
391 if (fCluLayer == 0) {
392 fCluLayer = new TClonesArray*[AliITSgeomTGeo::kNLayers];
393 fCluCoord = new TClonesArray*[AliITSgeomTGeo::kNLayers];
394 for(Int_t i=0;i<AliITSgeomTGeo::GetNLayers();i++) {
395 fCluLayer[i]=0;
396 fCluCoord[i]=0;
397 }
398 }
399 for(Int_t i=0;i<AliITSgeomTGeo::GetNLayers();i++){
400 AliITSlayer &layer=fgLayers[i];
401 if (!ForceSkippingOfLayer(i)) {
402 for(Int_t cli=0;cli<layer.GetNumberOfClusters();cli++){
403 AliITSRecPoint* cls = (AliITSRecPoint*)layer.GetCluster(cli);
404 if(cls->TestBit(kSAflag)==kTRUE) continue; //clusters used by TPC prol.
405 if(cls->GetQ()==0) continue; //fake clusters dead zones
406 if(i>1 && cls->GetQ()<=fMinQ) continue; // cut on SDD and SSD cluster charge
407 nclusters[i]++;
408 }
409 }
410 dmar[i]=0;
411 if(!fCluLayer[i]){
412 fCluLayer[i] = new TClonesArray("AliITSRecPoint",nclusters[i]);
413 }else{
414 fCluLayer[i]->Delete();
415 fCluLayer[i]->Expand(nclusters[i]);
416 }
417 if(!fCluCoord[i]){
418 fCluCoord[i] = new TClonesArray("AliITSclusterTable",nclusters[i]);
419 }else{
420 fCluCoord[i]->Delete();
421 fCluCoord[i]->Expand(nclusters[i]);
422 }
423 }
424
425 for(Int_t ilay=0;ilay<AliITSgeomTGeo::GetNLayers();ilay++){
426 TClonesArray &clulay = *fCluLayer[ilay];
427 TClonesArray &clucoo = *fCluCoord[ilay];
428 AliITSlayer &layer=fgLayers[ilay];
429 if (!ForceSkippingOfLayer(ilay)) {
430 for(Int_t cli=0;cli<layer.GetNumberOfClusters();cli++){
431 AliITSRecPoint* cls = (AliITSRecPoint*)layer.GetCluster(cli);
432 if(cls->TestBit(kSAflag)==kTRUE) continue;
433 if(cls->GetQ()==0) continue;
434 if(ilay>1 && cls->GetQ()<=fMinQ) continue;
435 Double_t phi=0;Double_t lambda=0;
436 Float_t x=0;Float_t y=0;Float_t z=0;
437 Float_t sx=0;Float_t sy=0;Float_t sz=0;
438 GetCoorAngles(cls,phi,lambda,x,y,z,primaryVertex);
439 GetCoorErrors(cls,sx,sy,sz);
440 new (clulay[dmar[ilay]]) AliITSRecPoint(*cls);
441 new (clucoo[dmar[ilay]]) AliITSclusterTable(x,y,z,sx,sy,sz,phi,lambda,cli);
442 dmar[ilay]++;
443 }
444 }
445 }
446
447 // track counter
448 Int_t ntrack=0;
449
450 static Int_t nClusLay[AliITSgeomTGeo::kNLayers];//counter for clusters on each layer
451 Int_t startLayForSeed=0;
452 Int_t lastLayForSeed=fOuterStartLayer;
453 Int_t nSeedSteps=lastLayForSeed-startLayForSeed;
454 Int_t seedStep=1;
455 if(fInwardFlag){
456 startLayForSeed=AliITSgeomTGeo::GetNLayers()-1;
457 lastLayForSeed=fInnerStartLayer;
458 nSeedSteps=startLayForSeed-lastLayForSeed;
459 seedStep=-1;
460 }
461
462 // loop on minimum number of points
463 for(Int_t iMinNPoints=AliITSgeomTGeo::GetNLayers(); iMinNPoints>=fMinNPoints; iMinNPoints--) {
464
465 // loop on starting layer for track finding
466 for(Int_t iSeedLay=0; iSeedLay<=nSeedSteps; iSeedLay++) {
467 Int_t theLay=startLayForSeed+iSeedLay*seedStep;
468 if(ForceSkippingOfLayer(theLay)) continue;
469 Int_t minNPoints=iMinNPoints-theLay;
470 if(fInwardFlag) minNPoints=iMinNPoints-(AliITSgeomTGeo::GetNLayers()-1-theLay);
471 for(Int_t i=theLay+1;i<AliITSgeomTGeo::GetNLayers();i++)
472 if(ForceSkippingOfLayer(i))
473 minNPoints--;
474 if(minNPoints<fMinNPoints) continue;
475
476 // loop on phi and lambda window size
477 for(Int_t nloop=0;nloop<fNloop;nloop++){
478 Int_t nclTheLay=fCluLayer[theLay]->GetEntries();
479 while(nclTheLay--){
480 ResetForFinding();
481 Bool_t useRP=SetFirstPoint(theLay,nclTheLay,primaryVertex);
482 if(!useRP) continue;
483 AliITStrackSA trs;
484
485 Int_t pflag=0;
486 Int_t kk;
487 for(kk=0;kk<AliITSgeomTGeo::GetNLayers();kk++) nClusLay[kk] = 0;
488
489 kk=0;
490 nClusLay[kk] = SearchClusters(theLay,fPhiWin[nloop],fLambdaWin[nloop],
491 &trs,primaryVertex[2],pflag);
492 Int_t nextLay=theLay+seedStep;
493 Bool_t goon=kTRUE;
494 while(goon){
495 kk++;
496 nClusLay[kk] = SearchClusters(nextLay,fPhiWin[nloop],fLambdaWin[nloop],
497 &trs,primaryVertex[2],pflag);
498 if(nClusLay[kk]!=0){
499 pflag=1;
500 if(kk==1) {
501 fPoint3[0]=fPointc[0];
502 fPoint3[1]=fPointc[1];
503 } else {
504 UpdatePoints();
505 }
506 }
507 nextLay+=seedStep;
508 if(nextLay<0 || nextLay==6) goon=kFALSE;
509 }
510
511
512 Int_t layOK=0;
513 if(!fInwardFlag){
514 for(Int_t nnp=0;nnp<AliITSgeomTGeo::GetNLayers()-theLay;nnp++){
515 if(nClusLay[nnp]!=0) layOK+=1;
516 }
517 }else{
518 for(Int_t nnp=theLay; nnp>=0; nnp--){
519 if(nClusLay[nnp]!=0) layOK+=1;
520 }
521 }
522 if(layOK>=minNPoints){
523 AliDebug(2,Form("---NPOINTS: %d; MAP: %d %d %d %d %d %d\n",layOK,nClusLay[0],nClusLay[1],nClusLay[2],nClusLay[3],nClusLay[4],nClusLay[5]));
524 AliITStrackV2* tr2 = 0;
525 tr2 = FitTrack(&trs,primaryVertex);
526 if(!tr2){
527 continue;
528 }
529 AliDebug(2,Form("---NPOINTS fit: %d\n",tr2->GetNumberOfClusters()));
530
531 StoreTrack(tr2,event,useAllClusters);
532 ntrack++;
533
534 }
535
536 }//end loop on clusters of theLay
537 } //end loop on window sizes
538 } //end loop on theLay
539 }//end loop on min points
540
541 // search for 1-point tracks in SPD, only for cosmics
542 // (A.Dainese 21.03.08)
543 if(AliITSReconstructor::GetRecoParam()->GetSAOnePointTracks() &&
544 TMath::Abs(event->GetMagneticField())<0.01) {
545 Int_t outerLayer=1; // only SPD
546 for(Int_t innLay=0; innLay<=TMath::Min(1,fOuterStartLayer); innLay++) {
547 // counter for clusters on each layer
548
549 for(Int_t nloop=0;nloop<fNloop;nloop++){
550 Int_t nclInnLay=fCluLayer[innLay]->GetEntries();
551 while(nclInnLay--){ //loop starting from layer innLay
552 ResetForFinding();
553 Bool_t useRP=SetFirstPoint(innLay,nclInnLay,primaryVertex);
554 if(!useRP) continue;
555 AliITStrackSA trs;
556
557 Int_t pflag=0;
558 Int_t kk;
559 for(kk=0;kk<AliITSgeomTGeo::GetNLayers();kk++) nClusLay[kk] = 0;
560
561 kk=0;
562 nClusLay[kk] = SearchClusters(innLay,fPhiWin[nloop],fLambdaWin[nloop],
563 &trs,primaryVertex[2],pflag);
564 for(Int_t nextLay=innLay+1; nextLay<=outerLayer; nextLay++) {
565 kk++;
566 nClusLay[kk] = SearchClusters(nextLay,fPhiWin[nloop],fLambdaWin[nloop],
567 &trs,primaryVertex[2],pflag);
568 if(nClusLay[kk]!=0){
569 pflag=1;
570 if(kk==1) {
571 fPoint3[0]=fPointc[0];
572 fPoint3[1]=fPointc[1];
573 } else {
574 UpdatePoints();
575 }
576 }
577 }
578
579 Int_t layOK=0;
580 for(Int_t nnp=0;nnp<AliITSgeomTGeo::GetNLayers()-innLay;nnp++){
581 if(nClusLay[nnp]!=0) layOK+=1;
582 }
583 if(layOK==1) {
584 AliDebug(2,Form("----NPOINTS: %d; MAP: %d %d %d %d %d %d\n",layOK,nClusLay[0],nClusLay[1],nClusLay[2],nClusLay[3],nClusLay[4],nClusLay[5]));
585 AliITStrackV2* tr2 = 0;
586 Bool_t onePoint = kTRUE;
587 tr2 = FitTrack(&trs,primaryVertex,onePoint);
588 if(!tr2){
589 continue;
590 }
591 AliDebug(2,Form("----NPOINTS fit: %d\n",tr2->GetNumberOfClusters()));
592
593 StoreTrack(tr2,event,useAllClusters);
594 ntrack++;
595
596 }
597
598 }//end loop on clusters of innLay
599 } //end loop on window sizes
600
601 } //end loop on innLay
602 } // end search 1-point tracks
603
604 if(!useAllClusters) AliInfo(Form("Number of found tracks: %d",event->GetNumberOfTracks()));
605 ResetForFinding();
606 return 0;
607
608}
609
610//________________________________________________________________________
611
612AliITStrackV2* AliITStrackerSA::FitTrack(AliITStrackSA* tr,Double_t *primaryVertex,Bool_t onePoint) {
613 //fit of the found track (most general case, also <6 points, layers missing)
614 // A.Dainese 16.11.07
615
616
617 const Int_t kMaxClu=AliITStrackSA::kMaxNumberOfClusters;
618
619 static Int_t firstmod[AliITSgeomTGeo::kNLayers];
620 static Int_t clind[AliITSgeomTGeo::kNLayers][kMaxClu];
621 static Int_t clmark[AliITSgeomTGeo::kNLayers][kMaxClu];
622 static Int_t end[AliITSgeomTGeo::kNLayers];
623 static Int_t indices[AliITSgeomTGeo::kNLayers];
624
625 static AliITSRecPoint *listlayer[AliITSgeomTGeo::kNLayers][kMaxClu];
626
627 for(Int_t i=0;i<AliITSgeomTGeo::GetNLayers();i++) {
628 firstmod[i]=AliITSgeomTGeo::GetModuleIndex(i+1,1,1);
629 end[i]=0;
630 for(Int_t j=0;j<kMaxClu; j++){
631 clind[i][j]=0;
632 clmark[i][j]=0;
633 listlayer[i][j]=0;
634 }
635 }
636
637
638 Int_t nclusters = tr->GetNumberOfClustersSA();
639 for(Int_t ncl=0;ncl<nclusters;ncl++){
640 Int_t index = tr->GetClusterIndexSA(ncl);
641 AliITSRecPoint* cl = (AliITSRecPoint*)GetCluster(index);
642 Int_t lay = (index & 0xf0000000) >> 28;
643 Int_t nInLay=end[lay];
644 listlayer[lay][nInLay]=cl;
645 clind[lay][nInLay]=index;
646 end[lay]++;
647 }
648
649 for(Int_t nlay=0;nlay<AliITSgeomTGeo::GetNLayers();nlay++){
650 for(Int_t ncl=0;ncl<tr->GetNumberOfMarked(nlay);ncl++){
651 Int_t mark = tr->GetClusterMark(nlay,ncl);
652 clmark[nlay][ncl]=mark;
653 }
654 }
655
656
657 Int_t firstLay=-1,secondLay=-1;
658 for(Int_t i=0;i<AliITSgeomTGeo::GetNLayers();i++) {
659 if(end[i]==0) {
660 end[i]=1;
661 }else{
662 if(firstLay==-1) {
663 firstLay=i;
664 } else if(secondLay==-1) {
665 secondLay=i;
666 }
667 }
668 }
669
670 if(firstLay==-1 || (secondLay==-1 && !onePoint)) return 0;
671 TClonesArray &arrMI= *fListOfTracks;
672 TClonesArray &arrSA= *fListOfSATracks;
673 Int_t nFoundTracks=0;
674
675
676 for(Int_t l0=0;l0<end[0];l0++){ //loop on layer 1
677 indices[0]=l0;
678 for(Int_t l1=0;l1<end[1];l1++){ //loop on layer 2
679 indices[1]=l1;
680 for(Int_t l2=0;l2<end[2];l2++){ //loop on layer 3
681 indices[2]=l2;
682 for(Int_t l3=0;l3<end[3];l3++){ //loop on layer 4
683 indices[3]=l3;
684 for(Int_t l4=0;l4<end[4];l4++){ //loop on layer 5
685 indices[4]=l4;
686 for(Int_t l5=0;l5<end[5];l5++){ //loop on layer 6
687 indices[5]=l5;
688
689 // estimate curvature from 2 innermost points (or innermost point + vertex)
690
691 Int_t iFirstLay=indices[firstLay];
692 Int_t mrk1=clmark[firstLay][iFirstLay];
693
694 AliITSRecPoint* p1=(AliITSRecPoint*)listlayer[firstLay][iFirstLay];
695 Int_t module1 = p1->GetDetectorIndex()+firstmod[firstLay];
696 Int_t layer,ladder,detector;
697 AliITSgeomTGeo::GetModuleId(module1,layer,ladder,detector);
698 Float_t yclu1 = p1->GetY();
699 Float_t zclu1 = p1->GetZ();
700
701 Double_t x1,y1,z1;
702 Double_t x2,y2,z2;
703 Double_t cv=0,tgl2=0,phi2=0;
704 AliITSclusterTable* arr1 = (AliITSclusterTable*)GetClusterCoord(firstLay,mrk1);
705 x1 = arr1->GetX();
706 y1 = arr1->GetY();
707 z1 = arr1->GetZ();
708
709 if(secondLay>0) {
710 Int_t iSecondLay=indices[secondLay];
711 Int_t mrk2=clmark[secondLay][iSecondLay];
712 AliITSclusterTable* arr2 = (AliITSclusterTable*)GetClusterCoord(secondLay,mrk2);
713 x2 = arr2->GetX();
714 y2 = arr2->GetY();
715 z2 = arr2->GetZ();
716 cv = Curvature(primaryVertex[0],primaryVertex[1],x1,y1,x2,y2);
717 tgl2 = (z2-z1)/TMath::Sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1));
718 phi2 = TMath::ATan2((y2-y1),(x2-x1));
719 } else { // special case of 1-point tracks, only for cosmics (B=0)
720 x2 = primaryVertex[0];
721 y2 = primaryVertex[1];
722 z2 = primaryVertex[2];
723 cv = 0;
724 tgl2 = (z1-z2)/TMath::Sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
725 phi2 = TMath::ATan2((y1-y2),(x1-x2));
726 }
727
728 // create track and attach it the RecPoints
729 AliITStrackSA trac(layer,ladder,detector,yclu1,zclu1,phi2,tgl2,cv,1);
730 for(Int_t iLay=5; iLay>=0; iLay--){
731 Int_t iInLay=indices[iLay];
732 AliITSRecPoint* cl=(AliITSRecPoint*)listlayer[iLay][iInLay];
733 if(cl!=0){
734 trac.AddClusterV2(iLay,(clind[iLay][iInLay] & 0x0fffffff)>>0);
735 trac.AddClusterMark(iLay,clmark[iLay][iInLay]);
736 }
737 }
738
739 //fit with Kalman filter using AliITStrackerMI::RefitAt()
740 AliITStrackSA ot(trac);
741
742 ot.ResetCovariance(10.);
743 ot.ResetClusters();
744
745 // Propagate inside the innermost layer with a cluster
746 if(ot.Propagate(ot.GetX()-0.1*ot.GetX())) {
747
748 if(RefitAt(AliITSRecoParam::GetrInsideITSscreen(),&ot,&trac)){ //fit from layer 1 to layer 6
749 AliITStrackMI otrack2(ot);
750 otrack2.ResetCovariance(10.);
751 otrack2.ResetClusters();
752 //fit from layer 6 to layer 1
753 if(RefitAt(AliITSRecoParam::GetrInsideSPD1(),&otrack2,&ot)) {
754 new(arrMI[nFoundTracks]) AliITStrackMI(otrack2);
755 new(arrSA[nFoundTracks]) AliITStrackSA(trac);
756 ++nFoundTracks;
757 }
758
759 }
760 }
761 }//end loop layer 6
762 }//end loop layer 5
763 }//end loop layer 4
764 }//end loop layer 3
765 }//end loop layer 2
766 }//end loop layer 1
767
768
769
770
771 if(fListOfTracks->GetEntries()==0) return 0;
772
773 Int_t lowchi2 = FindTrackLowChiSquare();
774 AliITStrackV2* otrack =(AliITStrackV2*)fListOfTracks->At(lowchi2);
775 AliITStrackSA* trsa = (AliITStrackSA*)fListOfSATracks->At(lowchi2);
776
777 if(otrack==0) return 0;
778
779 CookLabel(otrack,0.); //MI change - to see fake ratio
780 Int_t label=FindLabel(otrack);
781 otrack->SetLabel(label);
782 Double_t low=0.;
783 Double_t up=0.51;
784 otrack->CookdEdx(low,up);
785
786 //remove clusters of found track
787 for(Int_t nlay=0;nlay<AliITSgeomTGeo::GetNLayers();nlay++){
788 for(Int_t cln=0;cln<trsa->GetNumberOfMarked(nlay);cln++){
789 Int_t index = trsa->GetClusterMark(nlay,cln);
790 fCluLayer[nlay]->RemoveAt(index);
791 RemoveClusterCoord(nlay,index);
792 fCluLayer[nlay]->Compress();
793 }
794 }
795
796 return otrack;
797
798}
799
800//_______________________________________________________
801void AliITStrackerSA::StoreTrack(AliITStrackV2 *t,AliESDEvent *event, Bool_t pureSA) const
802{
803 //
804 // Add new track to the ESD
805 //
806 AliESDtrack outtrack;
807 outtrack.UpdateTrackParams(t,AliESDtrack::kITSin);
808 if(pureSA) outtrack.SetStatus(AliESDtrack::kITSpureSA);
809 for(Int_t i=0;i<12;i++) {
810 outtrack.SetITSModuleIndex(i,t->GetModuleIndex(i));
811 }
812 Double_t sdedx[4]={0.,0.,0.,0.};
813 for(Int_t i=0; i<4; i++) sdedx[i]=t->GetSampledEdx(i);
814 outtrack.SetITSdEdxSamples(sdedx);
815 event->AddTrack(&outtrack);
816
817 return;
818}
819
820
821//_______________________________________________________
822Int_t AliITStrackerSA::SearchClusters(Int_t layer,Double_t phiwindow,Double_t lambdawindow, AliITStrackSA* trs,Double_t /*zvertex*/,Int_t pflag){
823 //function used to to find the clusters associated to the track
824
825 if(ForceSkippingOfLayer(layer)) return 0;
826
827 Int_t nc=0;
828 AliITSlayer &lay = fgLayers[layer];
829 Double_t r=lay.GetR();
830 if(pflag==1){
831 Float_t cx1,cx2,cy1,cy2;
832 FindEquation(fPoint1[0],fPoint1[1],fPoint2[0],fPoint2[1],fPoint3[0],fPoint3[1],fCoef1,fCoef2,fCoef3);
833 if (FindIntersection(fCoef1,fCoef2,fCoef3,-r*r,cx1,cy1,cx2,cy2)==0)
834 return 0;
835 Double_t fi1=TMath::ATan2(cy1-fPoint1[1],cx1-fPoint1[0]);
836 Double_t fi2=TMath::ATan2(cy2-fPoint1[1],cx2-fPoint1[0]);
837 fPhiEstimate=ChoosePoint(fi1,fi2,fPhic);
838 }
839
840
841 Double_t phiExpect=fPhiEstimate;
842 Double_t lamExpect=fLambdac;
843
844 Int_t ncl = fCluLayer[layer]->GetEntriesFast();
845 for (Int_t index=0; index<ncl; index++) {
846 AliITSRecPoint *c = (AliITSRecPoint*)fCluLayer[layer]->UncheckedAt(index);
847 if (!c) continue;
848
849 AliITSclusterTable* arr = (AliITSclusterTable*)GetClusterCoord(layer,index);
850
851 Double_t lambda = arr->GetLambda();
852 if (TMath::Abs(lambda-lamExpect)>lambdawindow) continue;
853
854 Double_t phi = arr->GetPhi();
855 Double_t deltaPhi = phi-phiExpect;
856 if(deltaPhi>TMath::Pi()) deltaPhi-=2*TMath::Pi();
857 else if(deltaPhi<-TMath::Pi()) deltaPhi+=2*TMath::Pi();
858 if (TMath::Abs(deltaPhi)>phiwindow) continue;
859
860 if(trs->GetNumberOfClustersSA()==trs->GetMaxNumberOfClusters()) return 0;
861 if(trs->GetNumberOfMarked(layer)==trs->GetMaxNMarkedPerLayer()) return 0;
862 Int_t orind = arr->GetOrInd();
863 trs->AddClusterSA(layer,orind);
864 trs->AddClusterMark(layer,index);
865 nc++;
866 fLambdac=lambda;
867 fPhiEstimate=phi;
868
869 fPointc[0]=arr->GetX();
870 fPointc[1]=arr->GetY();
871
872 }
873 return nc;
874}
875
876//________________________________________________________________
877Bool_t AliITStrackerSA::SetFirstPoint(Int_t lay, Int_t clu, Double_t* primaryVertex){
878 // Sets the first point (seed) for tracking
879
880 AliITSRecPoint* cl = (AliITSRecPoint*)fCluLayer[lay]->UncheckedAt(clu);
881 if(!cl) return kFALSE;
882 if (cl->GetQ()<=0) return kFALSE;
883 if(lay>1 && cl->GetQ()<=fMinQ) return kFALSE;
884
885 AliITSclusterTable* arr = (AliITSclusterTable*)GetClusterCoord(lay,clu);
886 fPhic = arr->GetPhi();
887 fLambdac = arr->GetLambda();
888 fPhiEstimate = fPhic;
889 fPoint1[0]=primaryVertex[0];
890 fPoint1[1]=primaryVertex[1];
891 fPoint2[0]=arr->GetX();
892 fPoint2[1]=arr->GetY();
893 return kTRUE;
894}
895
896//________________________________________________________________
897void AliITStrackerSA::UpdatePoints(){
898 //update of points for the estimation of the curvature
899
900 fPoint2[0]=fPoint3[0];
901 fPoint2[1]=fPoint3[1];
902 fPoint3[0]=fPointc[0];
903 fPoint3[1]=fPointc[1];
904
905
906}
907
908//___________________________________________________________________
909Int_t AliITStrackerSA::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){
910
911 //given (x,y) of three recpoints (in global coordinates)
912 //returns the parameters a,b,c of circonference x*x + y*y +a*x + b*y +c
913
914 Float_t den = (x3-x1)*(y2-y1)-(x2-x1)*(y3-y1);
915 if(den==0) return 0;
916 a = ((y3-y1)*(x2*x2+y2*y2-x1*x1-y1*y1)-(y2-y1)*(x3*x3+y3*y3-x1*x1-y1*y1))/den;
917 b = -(x2*x2-x1*x1+y2*y2-y1*y1+a*(x2-x1))/(y2-y1);
918 c = -x1*x1-y1*y1-a*x1-b*y1;
919 return 1;
920 }
921//__________________________________________________________________________
922 Int_t AliITStrackerSA::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){
923
924 //Finds the intersection between the circonference of the track and the circonference centered in (0,0) represented by one layer
925 //c2 is -rlayer*rlayer
926
927 if(a1==0) return 0;
928 Double_t m = c2-c1;
929 Double_t aA = (b1*b1)/(a1*a1)+1;
930 Double_t bB = (-2*m*b1/(a1*a1));
931 Double_t cC = c2+(m*m)/(a1*a1);
932 Double_t dD = bB*bB-4*aA*cC;
933 if(dD<0) return 0;
934
935 y1 = (-bB+TMath::Sqrt(dD))/(2*aA);
936 y2 = (-bB-TMath::Sqrt(dD))/(2*aA);
937 x1 = (c2-c1-b1*y1)/a1;
938 x2 = (c2-c1-b1*y2)/a1;
939
940 return 1;
941}
942//____________________________________________________________________
943Double_t AliITStrackerSA::Curvature(Double_t x1,Double_t y1,Double_t
944x2,Double_t y2,Double_t x3,Double_t y3){
945
946 //calculates the curvature of track
947 Double_t den = (x3-x1)*(y2-y1)-(x2-x1)*(y3-y1);
948 if(den==0) return 0;
949 Double_t a = ((y3-y1)*(x2*x2+y2*y2-x1*x1-y1*y1)-(y2-y1)*(x3*x3+y3*y3-x1*x1-y1*y1))/den;
950 Double_t b = -(x2*x2-x1*x1+y2*y2-y1*y1+a*(x2-x1))/(y2-y1);
951 Double_t c = -x1*x1-y1*y1-a*x1-b*y1;
952 Double_t xc=-a/2.;
953
954 if((a*a+b*b-4*c)<0) return 0;
955 Double_t rad = TMath::Sqrt(a*a+b*b-4*c)/2.;
956 if(rad==0) return 0;
957
958 if((x1>0 && y1>0 && x1<xc)) rad*=-1;
959 if((x1<0 && y1>0 && x1<xc)) rad*=-1;
960 // if((x1<0 && y1<0 && x1<xc)) rad*=-1;
961 // if((x1>0 && y1<0 && x1<xc)) rad*=-1;
962
963 return 1/rad;
964
965}
966
967
968//____________________________________________________________________
969Double_t AliITStrackerSA::ChoosePoint(Double_t p1, Double_t p2, Double_t pp){
970
971 //Returns the point closest to pp
972
973 Double_t diff1 = p1-pp;
974 Double_t diff2 = p2-pp;
975
976 if(TMath::Abs(diff1)<TMath::Abs(diff2)) fPhiEstimate=p1;
977 else fPhiEstimate=p2;
978 return fPhiEstimate;
979
980}
981
982
983//_________________________________________________________________
984Int_t AliITStrackerSA::FindTrackLowChiSquare() const {
985 // returns track with lowest chi square
986 Int_t dim=fListOfTracks->GetEntries();
987 if(dim<=1) return 0;
988 AliITStrackV2* trk = (AliITStrackV2*)fListOfTracks->At(0);
989 Double_t minChi2=trk->GetChi2();
990 Int_t index=0;
991 for(Int_t i=1;i<dim;i++){
992 trk = (AliITStrackV2*)fListOfTracks->At(i);
993 Double_t chi2=trk->GetChi2();
994 if(chi2<minChi2){
995 minChi2=chi2;
996 index=i;
997 }
998 }
999 return index;
1000}
1001
1002//__________________________________________________________
1003Int_t AliITStrackerSA::FindLabel(AliITStrackV2* track){
1004 //
1005
1006 Int_t labl[AliITSgeomTGeo::kNLayers][3];
1007 Int_t cnts[AliITSgeomTGeo::kNLayers][3];
1008 for(Int_t j=0;j<AliITSgeomTGeo::GetNLayers();j++){
1009 for(Int_t k=0;k<3;k++){
1010 labl[j][k]=-2;
1011 cnts[j][k]=1;
1012 }
1013 }
1014 Int_t iNotLabel=0;
1015 for(Int_t i=0;i<track->GetNumberOfClusters(); i++) {
1016 Int_t indexc = track->GetClusterIndex(i);
1017 AliITSRecPoint* cl = (AliITSRecPoint*)GetCluster(indexc);
1018 Int_t iLayer=cl->GetLayer();
1019 for(Int_t k=0;k<3;k++){
1020 labl[iLayer][k]=cl->GetLabel(k);
1021 if(labl[iLayer][k]<0) iNotLabel++;
1022 }
1023 }
1024 if(iNotLabel==3*track->GetNumberOfClusters()) return -2;
1025
1026 for(Int_t j1=0;j1<AliITSgeomTGeo::kNLayers; j1++) {
1027 for(Int_t j2=0; j2<j1; j2++){
1028 for(Int_t k1=0; k1<3; k1++){
1029 for(Int_t k2=0; k2<3; k2++){
1030 if(labl[j1][k1]>=0 && labl[j1][k1]==labl[j2][k2] && cnts[j2][k2]>0){
1031 cnts[j2][k2]++;
1032 cnts[j1][k1]=0;
1033 }
1034 }
1035 }
1036 }
1037 }
1038
1039
1040 Int_t cntMax=0;
1041 Int_t label=-1;
1042 for(Int_t j=0;j<AliITSgeomTGeo::kNLayers;j++){
1043 for(Int_t k=0;k<3;k++){
1044 if(cnts[j][k]>cntMax && labl[j][k]>=0){
1045 cntMax=cnts[j][k];
1046 label=labl[j][k];
1047 }
1048 }
1049 }
1050
1051 Int_t lflag=0;
1052 for(Int_t i=0;i<AliITSgeomTGeo::kNLayers;i++)
1053 if(labl[i][0]==label || labl[i][1]==label || labl[i][2]==label) lflag++;
1054
1055 if(lflag<track->GetNumberOfClusters()) label = -label;
1056 return label;
1057}
1058//_____________________________________________________________________________
1059void AliITStrackerSA::SetCalculatedWindowSizes(Int_t n, Float_t phimin, Float_t phimax, Float_t lambdamin, Float_t lambdamax){
1060 // Set sizes of the phi and lambda windows used for track finding
1061 fNloop = n;
1062 if(fPhiWin) delete [] fPhiWin;
1063 if(fLambdaWin) delete [] fLambdaWin;
1064 fPhiWin = new Double_t[fNloop];
1065 fLambdaWin = new Double_t[fNloop];
1066 Float_t stepPhi=(phimax-phimin)/(Float_t)(fNloop-1);
1067 Float_t stepLambda=(lambdamax-lambdamin)/(Float_t)(fNloop-1);
1068 for(Int_t k=0;k<fNloop;k++){
1069 Float_t phi=phimin+k*stepPhi;
1070 Float_t lam=lambdamin+k*stepLambda;
1071 fPhiWin[k]=phi;
1072 fLambdaWin[k]=lam;
1073 }
1074}
1075//_____________________________________________________________________________
1076void AliITStrackerSA::SetFixedWindowSizes(Int_t n, Double_t *phi, Double_t *lam){
1077 // Set sizes of the phi and lambda windows used for track finding
1078 fNloop = n;
1079 if(phi){ // user defined values
1080 fPhiWin = new Double_t[fNloop];
1081 fLambdaWin = new Double_t[fNloop];
1082 for(Int_t k=0;k<fNloop;k++){
1083 fPhiWin[k]=phi[k];
1084 fLambdaWin[k]=lam[k];
1085 }
1086 }
1087 else { // default values
1088
1089 Double_t phid[33] = {0.002,0.003,0.004,0.0045,0.0047,
1090 0.005,0.0053,0.0055,
1091 0.006,0.0063,0.0065,0.007,0.0073,0.0075,0.0077,
1092 0.008,0.0083,0.0085,0.0087,0.009,0.0095,0.0097,
1093 0.01,0.0105,0.011,0.0115,0.012,0.0125,0.013,0.0135,0.0140,0.0145};
1094 Double_t lambdad[33] = {0.003,0.004,0.005,0.005,0.005,
1095 0.005,0.005,0.006,
1096 0.006,0.006,0.006,0.007,0.007,0.007,0.007,
1097 0.007,0.007,0.007,0.007,0.007,0.007,0.007,
1098 0.008,0.008,0.008,0.008,0.008,0.008,0.008,0.008,0.008,0.008};
1099
1100 if(fNloop!=33){
1101 fNloop = 33;
1102 }
1103
1104
1105 fPhiWin = new Double_t[fNloop];
1106 fLambdaWin = new Double_t[fNloop];
1107
1108 Double_t factor=AliITSReconstructor::GetRecoParam()->GetFactorSAWindowSizes(); // possibility to enlarge windows for cosmics reco with large misalignments (A.Dainese)
1109
1110 for(Int_t k=0;k<fNloop;k++){
1111 fPhiWin[k]=phid[k]*factor;
1112 fLambdaWin[k]=lambdad[k]*factor;
1113 }
1114
1115 }
1116
1117}
1118//_______________________________________________________________________
1119void AliITStrackerSA::GetCoorAngles(AliITSRecPoint* cl,Double_t &phi,Double_t &lambda, Float_t &x, Float_t &y,Float_t &z,Double_t* vertex){
1120 //Returns values of phi (azimuthal) and lambda angles for a given cluster
1121/*
1122 Double_t rot[9]; fGeom->GetRotMatrix(module,rot);
1123 Int_t lay,lad,det; fGeom->GetModuleId(module,lay,lad,det);
1124 Float_t tx,ty,tz; fGeom->GetTrans(lay,lad,det,tx,ty,tz);
1125
1126 Double_t alpha=TMath::ATan2(rot[1],rot[0])+TMath::Pi();
1127 Double_t phi1=TMath::Pi()/2+alpha;
1128 if (lay==1) phi1+=TMath::Pi();
1129
1130 Float_t cp=TMath::Cos(phi1), sp=TMath::Sin(phi1);
1131 Float_t r=tx*cp+ty*sp;
1132
1133 xyz= r*cp - cl->GetY()*sp;
1134 y= r*sp + cl->GetY()*cp;
1135 z=cl->GetZ();
1136*/
1137 Float_t xyz[3];
1138 cl->GetGlobalXYZ(xyz);
1139 x=xyz[0];
1140 y=xyz[1];
1141 z=xyz[2];
1142
1143 phi=TMath::ATan2(y-vertex[1],x-vertex[0]);
1144 lambda=TMath::ATan2(z-vertex[2],TMath::Sqrt((x-vertex[0])*(x-vertex[0])+(y-vertex[1])*(y-vertex[1])));
1145}
1146
1147//________________________________________________________________________
1148void AliITStrackerSA::GetCoorErrors(AliITSRecPoint* cl,Float_t &sx,Float_t &sy, Float_t &sz){
1149
1150 //returns sigmax, y, z of cluster in global coordinates
1151/*
1152 Double_t rot[9]; fGeom->GetRotMatrix(module,rot);
1153 Int_t lay,lad,det;
1154 AliITSgeomTGeo::GetModuleId(module,lay,lad,det);
1155
1156 Double_t alpha=TMath::ATan2(rot[1],rot[0])+TMath::Pi();
1157 Double_t phi=TMath::Pi()/2+alpha;
1158 if (lay==1) phi+=TMath::Pi();
1159
1160 Float_t cp=TMath::Cos(phi), sp=TMath::Sin(phi);
1161*/
1162 Float_t covm[6];
1163 cl->GetGlobalCov(covm);
1164 sx=TMath::Sqrt(covm[0]);
1165 sy=TMath::Sqrt(covm[3]);
1166 sz=TMath::Sqrt(covm[5]);
1167/*
1168 sx = TMath::Sqrt(sp*sp*cl->GetSigmaY2());
1169 sy = TMath::Sqrt(cp*cp*cl->GetSigmaY2());
1170 sz = TMath::Sqrt(cl->GetSigmaZ2());
1171*/
1172}
1173