1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
16 //-------------------------------------------------------------------------
17 // Implementation of the ITS tracker class
18 // It reads AliITSRecPoint clusters and creates AliITStrackV2 tracks
19 // and fills with them the ESD
20 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
21 // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch
22 //-------------------------------------------------------------------------
30 #include <TGeoMatrix.h>
32 #include "AliITSgeomTGeo.h"
33 #include "AliAlignObj.h"
34 #include "AliITSRecPoint.h"
35 #include "AliESDEvent.h"
36 #include "AliESDtrack.h"
37 #include "AliITSRecPoint.h"
38 #include "AliITSReconstructor.h"
39 #include "AliITStrackerV2.h"
41 ClassImp(AliITStrackerV2)
43 AliITStrackerV2::AliITSlayer AliITStrackerV2::fgLayers[AliITSgeomTGeo::kNLayers]; //ITS layers
45 AliITStrackerV2::AliITStrackerV2():
47 fI(AliITSgeomTGeo::GetNLayers()),
51 fLastLayerToTrackTo(AliITSRecoParam::GetLastLayerToTrackTo())
53 //--------------------------------------------------------------------
54 //This is the AliITStrackerV2 default constructor
55 //--------------------------------------------------------------------
57 for (Int_t i=1; i<AliITSgeomTGeo::GetNLayers()+1; i++) new(fgLayers+i-1) AliITSlayer();
59 fConstraint[0]=1; fConstraint[1]=0;
61 Double_t xyz[]={AliITSReconstructor::GetRecoParam()->GetXVdef(),
62 AliITSReconstructor::GetRecoParam()->GetYVdef(),
63 AliITSReconstructor::GetRecoParam()->GetZVdef()};
64 Double_t ers[]={AliITSReconstructor::GetRecoParam()->GetSigmaXVdef(),
65 AliITSReconstructor::GetRecoParam()->GetSigmaYVdef(),
66 AliITSReconstructor::GetRecoParam()->GetSigmaZVdef()};
69 for (Int_t i=0; i<AliITSgeomTGeo::GetNLayers(); i++) fLayersNotToSkip[i]=AliITSRecoParam::GetLayersNotToSkip(i);
73 AliITStrackerV2::AliITStrackerV2(const AliITStrackerV2 &t):
76 fBestTrack(t.fBestTrack),
77 fTrackToFollow(t.fTrackToFollow),
79 fLastLayerToTrackTo(t.fLastLayerToTrackTo)
81 //--------------------------------------------------------------------
82 //This is the AliITStrackerV2 copy constructor
83 //--------------------------------------------------------------------
85 //for (Int_t i=1; i<AliITSgeomTGeo::GetNLayers()+1; i++) new(fgLayers+i-1) AliITSlayer();
87 fConstraint[0]=t.fConstraint[0]; fConstraint[1]=t.fConstraint[1];
89 Double_t xyz[]={AliITSReconstructor::GetRecoParam()->GetXVdef(),
90 AliITSReconstructor::GetRecoParam()->GetYVdef(),
91 AliITSReconstructor::GetRecoParam()->GetZVdef()};
92 Double_t ers[]={AliITSReconstructor::GetRecoParam()->GetSigmaXVdef(),
93 AliITSReconstructor::GetRecoParam()->GetSigmaYVdef(),
94 AliITSReconstructor::GetRecoParam()->GetSigmaZVdef()};
95 xyz[0]=t.GetX(); xyz[1]=t.GetY(); xyz[2]=t.GetZ();
96 ers[0]=t.GetSigmaX(); ers[1]=t.GetSigmaY(); ers[2]=t.GetSigmaZ();
99 for (Int_t i=0; i<AliITSgeomTGeo::GetNLayers(); i++) fLayersNotToSkip[i]=t.fLayersNotToSkip[i];
103 AliITStrackerV2::AliITStrackerV2(const Char_t *geom) :
105 fI(AliITSgeomTGeo::GetNLayers()),
109 fLastLayerToTrackTo(AliITSRecoParam::GetLastLayerToTrackTo())
111 //--------------------------------------------------------------------
112 //This is the AliITStrackerV2 constructor
113 //--------------------------------------------------------------------
115 AliWarning("\"geom\" is actually a dummy argument !");
118 for (Int_t i=1; i<AliITSgeomTGeo::GetNLayers()+1; i++) {
119 Int_t nlad=AliITSgeomTGeo::GetNLadders(i);
120 Int_t ndet=AliITSgeomTGeo::GetNDetectors(i);
122 Double_t xyz[3], &x=xyz[0], &y=xyz[1], &z=xyz[2];
123 AliITSgeomTGeo::GetOrigTranslation(i,1,1,xyz);
124 Double_t poff=TMath::ATan2(y,x);
126 Double_t r=TMath::Sqrt(x*x + y*y);
128 AliITSgeomTGeo::GetOrigTranslation(i,1,2,xyz);
129 r += TMath::Sqrt(x*x + y*y);
130 AliITSgeomTGeo::GetOrigTranslation(i,2,1,xyz);
131 r += TMath::Sqrt(x*x + y*y);
132 AliITSgeomTGeo::GetOrigTranslation(i,2,2,xyz);
133 r += TMath::Sqrt(x*x + y*y);
136 new (fgLayers+i-1) AliITSlayer(r,poff,zoff,nlad,ndet);
138 for (Int_t j=1; j<nlad+1; j++) {
139 for (Int_t k=1; k<ndet+1; k++) { //Fill this layer with detectors
140 TGeoHMatrix m; AliITSgeomTGeo::GetOrigMatrix(i,j,k,m);
141 const TGeoHMatrix *tm=AliITSgeomTGeo::GetTracking2LocalMatrix(i,j,k);
143 Double_t txyz[3]={0.};
144 xyz[0]=0.; xyz[1]=0.; xyz[2]=0.;
145 m.LocalToMaster(txyz,xyz);
146 r=TMath::Sqrt(xyz[0]*xyz[0] + xyz[1]*xyz[1]);
147 Double_t phi=TMath::ATan2(xyz[1],xyz[0]);
149 if (phi<0) phi+=TMath::TwoPi();
150 else if (phi>=TMath::TwoPi()) phi-=TMath::TwoPi();
152 AliITSdetector &det=fgLayers[i-1].GetDetector((j-1)*ndet + k-1);
153 new(&det) AliITSdetector(r,phi);
159 fConstraint[0]=1; fConstraint[1]=0;
161 Double_t xyz[]={AliITSReconstructor::GetRecoParam()->GetXVdef(),
162 AliITSReconstructor::GetRecoParam()->GetYVdef(),
163 AliITSReconstructor::GetRecoParam()->GetZVdef()};
164 Double_t ers[]={AliITSReconstructor::GetRecoParam()->GetSigmaXVdef(),
165 AliITSReconstructor::GetRecoParam()->GetSigmaYVdef(),
166 AliITSReconstructor::GetRecoParam()->GetSigmaZVdef()};
169 for (Int_t i=0; i<AliITSgeomTGeo::GetNLayers(); i++) fLayersNotToSkip[i]=AliITSRecoParam::GetLayersNotToSkip(i);
173 void AliITStrackerV2::SetLayersNotToSkip(Int_t *l) {
174 //--------------------------------------------------------------------
175 //This function set masks of the layers which must be not skipped
176 //--------------------------------------------------------------------
177 for (Int_t i=0; i<AliITSgeomTGeo::GetNLayers(); i++) fLayersNotToSkip[i]=l[i];
180 Int_t AliITStrackerV2::LoadClusters(TTree *cTree) {
181 //--------------------------------------------------------------------
182 //This function loads ITS clusters
183 //--------------------------------------------------------------------
184 TBranch *branch=cTree->GetBranch("ITSRecPoints");
186 Error("LoadClusters"," can't get the branch !\n");
190 TClonesArray dummy("AliITSRecPoint",10000), *clusters=&dummy;
191 branch->SetAddress(&clusters);
194 for (Int_t i=0; i<AliITSgeomTGeo::GetNLayers(); i++) {
195 Int_t ndet=fgLayers[i].GetNdetectors();
196 Int_t jmax = j + fgLayers[i].GetNladders()*ndet;
198 Double_t r=fgLayers[i].GetR();
199 Double_t circ=TMath::TwoPi()*r;
201 for (; j<jmax; j++) {
202 if (!cTree->GetEvent(j)) continue;
203 Int_t ncl=clusters->GetEntriesFast();
206 AliITSRecPoint *c=(AliITSRecPoint*)clusters->UncheckedAt(ncl);
208 if (!c->Misalign()) AliWarning("Can't misalign this cluster !");
210 Int_t idx=c->GetDetectorIndex();
211 AliITSdetector &det=fgLayers[i].GetDetector(idx);
213 Double_t y=r*det.GetPhi()+c->GetY();
214 if (y>circ) y-=circ; else if (y<0) y+=circ;
217 fgLayers[i].InsertCluster(new AliITSRecPoint(*c));
221 fgLayers[i].ResetRoad(); //road defined by the cluster density
227 void AliITStrackerV2::UnloadClusters() {
228 //--------------------------------------------------------------------
229 //This function unloads ITS clusters
230 //--------------------------------------------------------------------
231 for (Int_t i=0; i<AliITSgeomTGeo::GetNLayers(); i++) fgLayers[i].ResetClusters();
234 static Int_t CorrectForDeadZoneMaterial(AliITStrackV2 *t) {
235 //--------------------------------------------------------------------
236 // Correction for the material between the TPC and the ITS
237 // (should it belong to the TPC code ?)
238 //--------------------------------------------------------------------
239 Double_t riw=80., diw=0.0053, x0iw=30; // TPC inner wall ?
240 Double_t rcd=61., dcd=0.0053, x0cd=30; // TPC "central drum" ?
241 Double_t yr=12.8, dr=0.03; // rods ?
242 Double_t zm=0.2, dm=0.40; // membrane
243 //Double_t rr=52., dr=0.19, x0r=24., yyr=7.77; //rails
244 Double_t rs=50., ds=0.001; // something belonging to the ITS (screen ?)
246 if (t->GetX() > riw) {
247 if (!t->PropagateTo(riw,diw,x0iw)) return 1;
248 if (TMath::Abs(t->GetY())>yr) t->CorrectForMaterial(dr);
249 if (TMath::Abs(t->GetZ())<zm) t->CorrectForMaterial(dm);
250 if (!t->PropagateTo(rcd,dcd,x0cd)) return 1;
251 //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z);
252 //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,dr,x0r);
253 if (!t->PropagateTo(rs,ds)) return 1;
254 } else if (t->GetX() < rs) {
255 if (!t->PropagateTo(rs,-ds)) return 1;
256 //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z);
257 //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,-dr,x0r);
258 if (!t->PropagateTo(rcd,-dcd,x0cd)) return 1;
259 if (!t->PropagateTo(riw+0.001,-diw,x0iw)) return 1;
261 ::Error("CorrectForDeadZoneMaterial","track is already in the dead zone !");
268 Int_t AliITStrackerV2::Clusters2Tracks(AliESDEvent *event) {
269 //--------------------------------------------------------------------
270 // This functions reconstructs ITS tracks
271 // The clusters must be already loaded !
272 //--------------------------------------------------------------------
273 TObjArray itsTracks(15000);
275 {/* Read ESD tracks */
276 Int_t nentr=event->GetNumberOfTracks();
277 Info("Clusters2Tracks", "Number of ESD tracks: %d\n", nentr);
279 AliESDtrack *esd=event->GetTrack(nentr);
281 if ((esd->GetStatus()&AliESDtrack::kTPCin)==0) continue;
282 if (esd->GetStatus()&AliESDtrack::kTPCout) continue;
283 if (esd->GetStatus()&AliESDtrack::kITSin) continue;
285 AliITStrackV2 *t = new AliITStrackV2(*esd);
287 if (TMath::Abs(t->GetD(GetX(),GetY()))>4) {
292 if (CorrectForDeadZoneMaterial(t)!=0) {
293 Warning("Clusters2Tracks",
294 "failed to correct for the material in the dead zone !\n");
298 itsTracks.AddLast(t);
300 } /* End Read ESD tracks */
303 Int_t nentr=itsTracks.GetEntriesFast();
306 for (fPass=0; fPass<2; fPass++) {
307 Int_t &constraint=fConstraint[fPass]; if (constraint<0) continue;
308 for (Int_t i=0; i<nentr; i++) {
309 AliITStrackV2 *t=(AliITStrackV2*)itsTracks.UncheckedAt(i);
310 if (t==0) continue; //this track has been already tracked
311 Int_t tpcLabel=t->GetLabel(); //save the TPC track label
313 ResetTrackToFollow(*t);
316 for (FollowProlongation(); fI<AliITSgeomTGeo::GetNLayers(); fI++) {
317 while (TakeNextProlongation()) FollowProlongation();
320 if (fBestTrack.GetNumberOfClusters() == 0) continue;
322 if (fConstraint[fPass]) {
323 ResetTrackToFollow(*t);
324 if (!RefitAt(3.7, &fTrackToFollow, &fBestTrack)) continue;
328 fBestTrack.SetLabel(tpcLabel);
329 fBestTrack.CookdEdx();
330 CookLabel(&fBestTrack,0.); //For comparison only
331 fBestTrack.UpdateESDtrack(AliESDtrack::kITSin);
332 UseClusters(&fBestTrack);
333 delete itsTracks.RemoveAt(i);
340 Info("Clusters2Tracks","Number of prolonged tracks: %d\n",ntrk);
345 Int_t AliITStrackerV2::PropagateBack(AliESDEvent *event) {
346 //--------------------------------------------------------------------
347 // This functions propagates reconstructed ITS tracks back
348 // The clusters must be loaded !
349 //--------------------------------------------------------------------
350 Int_t nentr=event->GetNumberOfTracks();
351 Info("PropagateBack", "Number of ESD tracks: %d\n", nentr);
354 for (Int_t i=0; i<nentr; i++) {
355 AliESDtrack *esd=event->GetTrack(i);
357 if ((esd->GetStatus()&AliESDtrack::kITSin)==0) continue;
358 if (esd->GetStatus()&AliESDtrack::kITSout) continue;
360 AliITStrackV2 *t = new AliITStrackV2(*esd);
362 ResetTrackToFollow(*t);
364 // propagete to vertex [SR, GSI 17.02.2003]
365 // Start Time measurement [SR, GSI 17.02.2003], corrected by I.Belikov
366 if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) {
367 if (fTrackToFollow.PropagateToVertex(event->GetVertex())) {
368 fTrackToFollow.StartTimeIntegral();
370 Bool_t okProp=fTrackToFollow.PropagateTo(3.,-0.0028,65.19);
372 AliWarning("Propagation to beam pipe radius failed");
376 fTrackToFollow.ResetCovariance(10.); fTrackToFollow.ResetClusters();
377 if (RefitAt(49.,&fTrackToFollow,t)) {
378 if (CorrectForDeadZoneMaterial(&fTrackToFollow)!=0) {
379 Warning("PropagateBack",
380 "failed to correct for the material in the dead zone !\n");
384 fTrackToFollow.SetLabel(t->GetLabel());
385 //fTrackToFollow.CookdEdx();
386 CookLabel(&fTrackToFollow,0.); //For comparison only
387 fTrackToFollow.UpdateESDtrack(AliESDtrack::kITSout);
388 UseClusters(&fTrackToFollow);
394 Info("PropagateBack","Number of back propagated ITS tracks: %d\n",ntrk);
399 Int_t AliITStrackerV2::RefitInward(AliESDEvent *event) {
400 //--------------------------------------------------------------------
401 // This functions refits ITS tracks using the
402 // "inward propagated" TPC tracks
403 // The clusters must be loaded !
404 //--------------------------------------------------------------------
405 Int_t nentr=event->GetNumberOfTracks();
406 Info("RefitInward", "Number of ESD tracks: %d\n", nentr);
409 for (Int_t i=0; i<nentr; i++) {
410 AliESDtrack *esd=event->GetTrack(i);
412 if ((esd->GetStatus()&AliESDtrack::kITSout) == 0) continue;
413 if (esd->GetStatus()&AliESDtrack::kITSrefit) continue;
414 if (esd->GetStatus()&AliESDtrack::kTPCout)
415 if ((esd->GetStatus()&AliESDtrack::kTPCrefit)==0) continue;
417 AliITStrackV2 *t = new AliITStrackV2(*esd);
419 if (CorrectForDeadZoneMaterial(t)!=0) {
420 Warning("RefitInward",
421 "failed to correct for the material in the dead zone !\n");
426 ResetTrackToFollow(*t);
427 fTrackToFollow.ResetClusters();
430 if (RefitAt(3.7, &fTrackToFollow, t, kTRUE)) {
431 fTrackToFollow.SetLabel(t->GetLabel());
432 fTrackToFollow.CookdEdx();
433 CookLabel(&fTrackToFollow,0.); //For comparison only
435 if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) {//The beam pipe
436 fTrackToFollow.UpdateESDtrack(AliESDtrack::kITSrefit);
437 AliESDtrack *esdTrack =fTrackToFollow.GetESDtrack();
438 Double_t r[3]={0.,0.,0.};
440 esdTrack->RelateToVertex(event->GetVertex(),GetBz(r),maxD);
447 Info("RefitInward","Number of refitted tracks: %d\n",ntrk);
452 AliCluster *AliITStrackerV2::GetCluster(Int_t index) const {
453 //--------------------------------------------------------------------
454 // Return pointer to a given cluster
455 //--------------------------------------------------------------------
456 Int_t l=(index & 0xf0000000) >> 28;
457 Int_t c=(index & 0x0fffffff) >> 00;
458 return fgLayers[l].GetCluster(c);
462 void AliITStrackerV2::FollowProlongation() {
463 //--------------------------------------------------------------------
464 //This function finds a track prolongation
465 //--------------------------------------------------------------------
466 while (fI>fLastLayerToTrackTo) {
469 AliITSlayer &layer=fgLayers[i];
470 AliITStrackV2 &track=fTracks[i];
472 Double_t r=layer.GetR();
475 Double_t rs=0.5*(fgLayers[i+1].GetR() + r);
476 Double_t d=0.0034, x0=38.6;
477 if (i==1) {rs=9.; d=0.0097; x0=42;}
478 if (!fTrackToFollow.PropagateTo(rs,d,x0)) {
479 //Warning("FollowProlongation","propagation failed !\n");
486 if (!fTrackToFollow.GetPhiZat(r,phi,z)) {
487 //Warning("FollowProlongation","failed to estimate track !\n");
491 Int_t idet=layer.FindDetectorIndex(phi,z);
493 //Warning("FollowProlongation","failed to find a detector !\n");
497 //propagate to the intersection
498 const AliITSdetector &det=layer.GetDetector(idet);
500 if (!fTrackToFollow.Propagate(phi,det.GetR())) {
501 //Warning("FollowProlongation","propagation failed !\n");
504 fTrackToFollow.SetDetectorIndex(idet);
506 //Select possible prolongations and store the current track estimation
507 track.~AliITStrackV2(); new(&track) AliITStrackV2(fTrackToFollow);
508 Double_t dz=7*TMath::Sqrt(track.GetSigmaZ2() + AliITSReconstructor::GetRecoParam()->GetSigmaZ2(i));
509 Double_t dy=7*TMath::Sqrt(track.GetSigmaY2() + AliITSReconstructor::GetRecoParam()->GetSigmaY2(i));
510 Double_t road=layer.GetRoad();
511 if (dz*dy>road*road) {
512 Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd;
513 dz=road*scz; dy=road*scy;
516 //Double_t dz=4*TMath::Sqrt(track.GetSigmaZ2() + AliITSReconstructor::GetRecoParam()->GetSigmaZ2(i));
517 if (dz < 0.5*TMath::Abs(track.GetTgl())) dz=0.5*TMath::Abs(track.GetTgl());
518 if (dz > AliITSReconstructor::GetRecoParam()->GetMaxRoad()) {
519 //Warning("FollowProlongation","too broad road in Z !\n");
523 if (TMath::Abs(fTrackToFollow.GetZ()-GetZ()) > r+dz) return;
525 //Double_t dy=4*TMath::Sqrt(track.GetSigmaY2() + AliITSReconstructor::GetRecoParam()->GetSigmaY2(i));
526 if (dy < 0.5*TMath::Abs(track.GetSnp())) dy=0.5*TMath::Abs(track.GetSnp());
527 if (dy > AliITSReconstructor::GetRecoParam()->GetMaxRoad()) {
528 //Warning("FollowProlongation","too broad road in Y !\n");
534 Double_t zmin=track.GetZ() - dz;
535 Double_t zmax=track.GetZ() + dz;
536 Double_t ymin=track.GetY() + r*phi - dy;
537 Double_t ymax=track.GetY() + r*phi + dy;
538 if (layer.SelectClusters(zmin,zmax,ymin,ymax)==0)
539 if (fLayersNotToSkip[fI]) return;
541 if (!TakeNextProlongation())
542 if (fLayersNotToSkip[fI]) return;
546 //deal with the best track
547 Int_t ncl=fTrackToFollow.GetNumberOfClusters();
548 Int_t nclb=fBestTrack.GetNumberOfClusters();
551 Double_t chi2=fTrackToFollow.GetChi2();
552 if (chi2/ncl < AliITSReconstructor::GetRecoParam()->GetChi2PerCluster()) {
553 if (ncl > nclb || chi2 < fBestTrack.GetChi2()) {
561 Int_t AliITStrackerV2::TakeNextProlongation() {
562 //--------------------------------------------------------------------
563 // This function takes another track prolongation
565 // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch
566 //--------------------------------------------------------------------
567 AliITSlayer &layer=fgLayers[fI];
568 ResetTrackToFollow(fTracks[fI]);
570 Double_t dz=7*TMath::Sqrt(fTrackToFollow.GetSigmaZ2() + AliITSReconstructor::GetRecoParam()->GetSigmaZ2(fI));
571 Double_t dy=7*TMath::Sqrt(fTrackToFollow.GetSigmaY2() + AliITSReconstructor::GetRecoParam()->GetSigmaY2(fI));
572 Double_t road=layer.GetRoad();
573 if (dz*dy>road*road) {
574 Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd;
575 dz=road*scz; dy=road*scy;
578 const AliITSRecPoint *c=0; Int_t ci=-1;
579 const AliITSRecPoint *cc=0; Int_t cci=-1;
580 Double_t chi2=AliITSReconstructor::GetRecoParam()->GetMaxChi2();
581 while ((c=layer.GetNextCluster(ci))!=0) {
582 Int_t idet=c->GetDetectorIndex();
584 if (fTrackToFollow.GetDetectorIndex()!=idet) {
585 const AliITSdetector &det=layer.GetDetector(idet);
586 ResetTrackToFollow(fTracks[fI]);
587 if (!fTrackToFollow.Propagate(det.GetPhi(),det.GetR())) {
588 //Warning("TakeNextProlongation","propagation failed !\n");
591 fTrackToFollow.SetDetectorIndex(idet);
592 if (TMath::Abs(fTrackToFollow.GetZ()-GetZ())>layer.GetR()+dz) continue;
595 if (TMath::Abs(fTrackToFollow.GetZ() - c->GetZ()) > dz) continue;
596 if (TMath::Abs(fTrackToFollow.GetY() - c->GetY()) > dy) continue;
598 Double_t ch2=fTrackToFollow.GetPredictedChi2(c);
599 if (ch2 > chi2) continue;
607 {// Take into account the mis-alignment
608 Double_t x = fTrackToFollow.GetX() + cc->GetX();
609 if (!fTrackToFollow.PropagateTo(x,0.,0.)) return 0;
611 if (!fTrackToFollow.Update(cc,chi2,(fI<<28)+cci)) {
612 //Warning("TakeNextProlongation","filtering failed !\n");
616 if (fTrackToFollow.GetNumberOfClusters()>1)
617 if (TMath::Abs(fTrackToFollow.GetD(GetX(),GetY()))>4) return 0;
620 SetSampledEdx(cc->GetQ(),fI-2); //b.b.
624 Double_t d=layer.GetThickness(fTrackToFollow.GetY(),fTrackToFollow.GetZ(),x0);
625 fTrackToFollow.CorrectForMaterial(d,x0);
628 if (fConstraint[fPass]) {
629 Double_t d=GetEffectiveThickness(0,0); //Think of this !!!!
630 Double_t xyz[]={GetX(),GetY(),GetZ()};
631 Double_t ers[]={GetSigmaX(),GetSigmaY(),GetSigmaZ()};
632 fTrackToFollow.Improve(d,xyz,ers);
639 AliITStrackerV2::AliITSlayer::AliITSlayer():
647 fRoad(2*fR*TMath::Sqrt(3.14/1.)) //assuming that there's only one cluster
649 //--------------------------------------------------------------------
650 //default AliITSlayer constructor
651 //--------------------------------------------------------------------
653 for (Int_t i=0; i<kNsector; i++) fN[i]=0;
654 for (Int_t i=0; i<AliITSRecoParam::kMaxClusterPerLayer; i++){
660 AliITStrackerV2::AliITSlayer::
661 AliITSlayer(Double_t r,Double_t p,Double_t z,Int_t nl,Int_t nd):
667 fDetectors(new AliITSdetector[nl*nd]),
669 fRoad(2*r*TMath::Sqrt(3.14/1.)) //assuming that there's only one cluster
671 //--------------------------------------------------------------------
672 //main AliITSlayer constructor
673 //--------------------------------------------------------------------
675 for (Int_t i=0; i<kNsector; i++) fN[i]=0;
677 for (Int_t i=0; i<AliITSRecoParam::kMaxClusterPerLayer; i++){
683 AliITStrackerV2::AliITSlayer::~AliITSlayer() {
684 //--------------------------------------------------------------------
685 // AliITSlayer destructor
686 //--------------------------------------------------------------------
691 void AliITStrackerV2::AliITSlayer::ResetClusters() {
692 //--------------------------------------------------------------------
693 // This function removes loaded clusters
694 //--------------------------------------------------------------------
695 for (Int_t s=0; s<kNsector; s++) {
699 delete fClusters[s*kMaxClusterPerSector+n];
704 void AliITStrackerV2::AliITSlayer::ResetRoad() {
705 //--------------------------------------------------------------------
706 // This function calculates the road defined by the cluster density
707 //--------------------------------------------------------------------
709 for (Int_t s=0; s<kNsector; s++) {
712 if (TMath::Abs(fClusters[s*kMaxClusterPerSector+i]->GetZ())<fR) n++;
714 if (n>1) fRoad=2*fR*TMath::Sqrt(3.14/n);
717 Int_t AliITStrackerV2::AliITSlayer::InsertCluster(AliITSRecPoint *c) {
718 //--------------------------------------------------------------------
719 // This function inserts a cluster to this layer in increasing
720 // order of the cluster's fZ
721 //--------------------------------------------------------------------
722 Float_t circ=TMath::TwoPi()*fR;
723 Int_t sec=Int_t(kNsector*c->GetPhiR()/circ);
725 ::Error("InsertCluster","Wrong sector !\n");
729 if (n>=kMaxClusterPerSector) {
730 ::Error("InsertCluster","Too many clusters !\n");
733 if (n==0) fClusters[sec*kMaxClusterPerSector]=c;
735 Int_t i=FindClusterIndex(c->GetZ(),sec);
736 Int_t k=n-i+sec*kMaxClusterPerSector;
737 memmove(fClusters+i+1 ,fClusters+i,k*sizeof(AliITSRecPoint*));
745 AliITStrackerV2::AliITSlayer::FindClusterIndex(Float_t z,Int_t s) const {
746 //--------------------------------------------------------------------
747 // For the sector "s", this function returns the index of the first
748 // with its fZ >= "z".
749 //--------------------------------------------------------------------
751 if (nc==0) return kMaxClusterPerSector*s;
753 Int_t b=kMaxClusterPerSector*s;
754 if (z <= fClusters[b]->GetZ()) return b;
757 if (z > fClusters[e]->GetZ()) return e+1;
760 for (; b<e; m=(b+e)/2) {
761 if (z > fClusters[m]->GetZ()) b=m+1;
767 Int_t AliITStrackerV2::AliITSlayer::
768 SelectClusters(Float_t zmin,Float_t zmax,Float_t ymin, Float_t ymax) {
769 //--------------------------------------------------------------------
770 // This function selects clusters within the "window"
771 //--------------------------------------------------------------------
772 Float_t circ=fR*TMath::TwoPi();
774 if (ymin>circ) ymin-=circ; else if (ymin<0) ymin+=circ;
775 if (ymax>circ) ymax-=circ; else if (ymax<0) ymax+=circ;
777 Int_t i1=Int_t(kNsector*ymin/circ); if (i1==kNsector) i1--;
779 Float_t ym = (ymax<ymin) ? ymax+circ : ymax;
780 Int_t i=FindClusterIndex(zmin,i1), imax=i1*kMaxClusterPerSector+fN[i1];
781 for (; i<imax; i++) {
782 AliITSRecPoint *c=fClusters[i];
783 if (c->IsUsed()) continue;
784 if (c->GetZ()>zmax) break;
785 if (c->GetPhiR()<=ymin) continue;
786 if (c->GetPhiR()>ym) continue;
791 Int_t i2=Int_t(kNsector*ymax/circ); if (i2==kNsector) i2--;
792 if (i2==i1) return fNsel;
795 Float_t ym = (ymin>ymax) ? ymin-circ : ymin;
796 Int_t i=FindClusterIndex(zmin,i2), imax=i2*kMaxClusterPerSector+fN[i2];
797 for (; i<imax; i++) {
798 AliITSRecPoint *c=fClusters[i];
799 if (c->IsUsed()) continue;
800 if (c->GetZ()>zmax) break;
801 if (c->GetPhiR()<=ym) continue;
802 if (c->GetPhiR()>ymax) continue;
810 const AliITSRecPoint *AliITStrackerV2::AliITSlayer::GetNextCluster(Int_t &ci){
811 //--------------------------------------------------------------------
812 // This function returns clusters within the "window"
813 //--------------------------------------------------------------------
824 Int_t AliITStrackerV2::AliITSlayer::GetNumberOfClusters() const {
826 for (Int_t s=0; s<kNsector; s++) n+=fN[s];
831 AliITStrackerV2::AliITSlayer::FindDetectorIndex(Double_t phi,Double_t z)const {
832 //--------------------------------------------------------------------
833 //This function finds the detector crossed by the track
834 //--------------------------------------------------------------------
836 if (fZOffset<0) // old geometry
837 dphi = -(phi-fPhiOffset);
839 dphi = phi-fPhiOffset;
841 if (dphi < 0) dphi += 2*TMath::Pi();
842 else if (dphi >= 2*TMath::Pi()) dphi -= 2*TMath::Pi();
843 Int_t np=Int_t(dphi*fNladders*0.5/TMath::Pi()+0.5);
844 if (np>=fNladders) np-=fNladders;
845 if (np<0) np+=fNladders;
847 Double_t dz=fZOffset-z;
848 Int_t nz=Int_t(dz*(fNdetectors-1)*0.5/fZOffset+0.5);
849 if (nz>=fNdetectors) return -1;
852 return np*fNdetectors + nz;
856 AliITStrackerV2::AliITSlayer::GetThickness(Double_t y,Double_t z,Double_t &x0)
858 //--------------------------------------------------------------------
859 //This function returns the layer thickness at this point (units X0)
860 //--------------------------------------------------------------------
864 if (43<fR&&fR<45) { //SSD2
867 if (TMath::Abs(y-0.00)>3.40) d+=dd;
868 if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);}
869 if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);}
870 for (Int_t i=0; i<12; i++) {
871 if (TMath::Abs(z-3.9*(i+0.5))<0.15) {
872 if (TMath::Abs(y-0.00)>3.40) d+=dd;
876 if (TMath::Abs(z+3.9*(i+0.5))<0.15) {
877 if (TMath::Abs(y-0.00)>3.40) d+=dd;
881 if (TMath::Abs(z-3.4-3.9*i)<0.50) {d+=(0.016-0.0034); break;}
882 if (TMath::Abs(z+0.5+3.9*i)<0.50) {d+=(0.016-0.0034); break;}
885 if (37<fR&&fR<41) { //SSD1
888 if (TMath::Abs(y-0.00)>3.40) d+=dd;
889 if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);}
890 if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);}
891 for (Int_t i=0; i<11; i++) {
892 if (TMath::Abs(z-3.9*i)<0.15) {
893 if (TMath::Abs(y-0.00)>3.40) d+=dd;
897 if (TMath::Abs(z+3.9*i)<0.15) {
898 if (TMath::Abs(y-0.00)>3.40) d+=dd;
902 if (TMath::Abs(z-1.85-3.9*i)<0.50) {d+=(0.016-0.0034); break;}
903 if (TMath::Abs(z+2.05+3.9*i)<0.50) {d+=(0.016-0.0034); break;}
906 if (13<fR&&fR<26) { //SDD
909 if (TMath::Abs(y-0.00)>3.30) d+=dd;
911 if (TMath::Abs(y-1.80)<0.55) {
913 for (Int_t j=0; j<20; j++) {
914 if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;}
915 if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;}
918 if (TMath::Abs(y+1.80)<0.55) {
920 for (Int_t j=0; j<20; j++) {
921 if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;}
922 if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;}
926 for (Int_t i=0; i<4; i++) {
927 if (TMath::Abs(z-7.3*i)<0.60) {
929 if (TMath::Abs(y-0.00)>3.30) d+=dd;
932 if (TMath::Abs(z+7.3*i)<0.60) {
934 if (TMath::Abs(y-0.00)>3.30) d+=dd;
939 if (6<fR&&fR<8) { //SPD2
940 Double_t dd=0.0063; x0=21.5;
942 if (TMath::Abs(y-3.08)>0.5) d+=dd;
943 //if (TMath::Abs(y-3.08)>0.45) d+=dd;
944 if (TMath::Abs(y-3.03)<0.10) {d+=0.014;}
946 if (3<fR&&fR<5) { //SPD1
947 Double_t dd=0.0063; x0=21.5;
949 if (TMath::Abs(y+0.21)>0.6) d+=dd;
950 //if (TMath::Abs(y+0.21)>0.45) d+=dd;
951 if (TMath::Abs(y+0.10)<0.10) {d+=0.014;}
957 Double_t AliITStrackerV2::GetEffectiveThickness(Double_t y,Double_t z) const
959 //--------------------------------------------------------------------
960 //Returns the thickness between the current layer and the vertex (units X0)
961 //--------------------------------------------------------------------
962 Double_t d=0.0028*3*3; //beam pipe
965 Double_t xn=fgLayers[fI].GetR();
966 for (Int_t i=0; i<fI; i++) {
967 Double_t xi=fgLayers[i].GetR();
968 d+=fgLayers[i].GetThickness(y,z,x0)*xi*xi;
977 Double_t xi=0.5*(fgLayers[3].GetR()+fgLayers[4].GetR());
984 Bool_t AliITStrackerV2::RefitAt(Double_t xx,AliITStrackV2 *t,
985 const AliITStrackV2 *c, Bool_t extra) {
986 //--------------------------------------------------------------------
987 // This function refits the track "t" at the position "x" using
988 // the clusters from "c"
989 // If "extra"==kTRUE,
990 // the clusters from overlapped modules get attached to "t"
991 //--------------------------------------------------------------------
992 Int_t index[AliITSgeomTGeo::kNLayers];
994 for (k=0; k<AliITSgeomTGeo::GetNLayers(); k++) index[k]=-1;
995 Int_t nc=c->GetNumberOfClusters();
996 for (k=0; k<nc; k++) {
997 Int_t idx=c->GetClusterIndex(k),nl=(idx&0xf0000000)>>28;
1001 Int_t from, to, step;
1002 if (xx > t->GetX()) {
1003 from=0; to=AliITSgeomTGeo::GetNLayers();
1006 from=AliITSgeomTGeo::GetNLayers()-1; to=-1;
1010 for (Int_t i=from; i != to; i += step) {
1011 AliITSlayer &layer=fgLayers[i];
1012 Double_t r=layer.GetR();
1015 Double_t hI=i-0.5*step;
1016 if (TMath::Abs(hI-1.5)<0.01 || TMath::Abs(hI-3.5)<0.01) {
1017 Int_t iLay = i-step;
1019 if(iLay<0 || iLay>= AliITSgeomTGeo::kNLayers){
1020 AliError(Form("Invalid layer %d ",iLay));
1024 rs=0.5*(fgLayers[i-step].GetR() + r);
1026 Double_t d=0.0034, x0=38.6;
1027 if (TMath::Abs(hI-1.5)<0.01) {rs=9.; d=0.0097; x0=42;}
1028 if (!t->PropagateTo(rs,-step*d,x0)) {
1034 // remember old position [SR, GSI 18.02.2003]
1035 Double_t oldX=0., oldY=0., oldZ=0.;
1036 if (t->IsStartedTimeIntegral() && step==1) {
1037 t->GetGlobalXYZat(t->GetX(),oldX,oldY,oldZ);
1042 if (!t->GetPhiZat(r,phi,z)) {
1046 Int_t idet=layer.FindDetectorIndex(phi,z);
1050 const AliITSdetector &det=layer.GetDetector(idet);
1052 if (!t->Propagate(phi,det.GetR())) {
1055 t->SetDetectorIndex(idet);
1057 const AliITSRecPoint *cl=0;
1058 Double_t maxchi2=AliITSReconstructor::GetRecoParam()->GetMaxChi2();
1062 const AliITSRecPoint *ccc=(AliITSRecPoint *)GetCluster(idx);
1063 if (idet != ccc->GetDetectorIndex()) {
1064 idet=ccc->GetDetectorIndex();
1065 const AliITSdetector &det2=layer.GetDetector(idet);
1066 if (!t->Propagate(det2.GetPhi(),det2.GetR())) {
1069 t->SetDetectorIndex(idet);
1071 Double_t chi2=t->GetPredictedChi2(ccc);
1081 // Take into account the mis-alignment
1082 Double_t x=t->GetX()+cl->GetX();
1083 if (!t->PropagateTo(x,0.,0.)) return kFALSE;
1084 if (!t->Update(cl,maxchi2,idx)) {
1087 t->SetSampledEdx(cl->GetQ(),i-2);
1092 Double_t d=layer.GetThickness(t->GetY(),t->GetZ(),x0);
1093 t->CorrectForMaterial(-step*d,x0);
1096 if (extra) { //search for extra clusters
1097 AliITStrackV2 tmp(*t);
1098 Double_t dz=4*TMath::Sqrt(tmp.GetSigmaZ2()+AliITSReconstructor::GetRecoParam()->GetSigmaZ2(i));
1099 if (dz < 0.5*TMath::Abs(tmp.GetTgl())) dz=0.5*TMath::Abs(tmp.GetTgl());
1100 Double_t dy=4*TMath::Sqrt(t->GetSigmaY2()+AliITSReconstructor::GetRecoParam()->GetSigmaY2(i));
1101 if (dy < 0.5*TMath::Abs(tmp.GetSnp())) dy=0.5*TMath::Abs(tmp.GetSnp());
1102 Double_t zmin=t->GetZ() - dz;
1103 Double_t zmax=t->GetZ() + dz;
1104 Double_t ymin=t->GetY() + phi*r - dy;
1105 Double_t ymax=t->GetY() + phi*r + dy;
1106 layer.SelectClusters(zmin,zmax,ymin,ymax);
1108 const AliITSRecPoint *cx=0; Int_t ci=-1,cci=-1;
1109 maxchi2=1000.*AliITSReconstructor::GetRecoParam()->GetMaxChi2();
1110 Double_t tolerance=0.1;
1111 while ((cx=layer.GetNextCluster(ci))!=0) {
1112 if (idet == cx->GetDetectorIndex()) continue;
1114 const AliITSdetector &detx=layer.GetDetector(cx->GetDetectorIndex());
1116 if (!tmp.Propagate(detx.GetPhi(),detx.GetR())) continue;
1118 if (TMath::Abs(tmp.GetZ() - cx->GetZ()) > tolerance) continue;
1119 if (TMath::Abs(tmp.GetY() - cx->GetY()) > tolerance) continue;
1121 Double_t chi2=tmp.GetPredictedChi2(cx);
1122 if (chi2<maxchi2) { maxchi2=chi2; cci=ci; }
1124 if (cci>=0) t->SetExtraCluster(i,(i<<28)+cci);
1127 // track time update [SR, GSI 17.02.2003]
1128 if (t->IsStartedTimeIntegral() && step==1) {
1129 Double_t newX, newY, newZ;
1130 t->GetGlobalXYZat(t->GetX(),newX,newY,newZ);
1131 Double_t dL2 = (oldX-newX)*(oldX-newX) + (oldY-newY)*(oldY-newY) +
1132 (oldZ-newZ)*(oldZ-newZ);
1133 t->AddTimeStep(TMath::Sqrt(dL2));
1139 if (!t->PropagateTo(xx,0.,0.)) return kFALSE;
1143 void AliITStrackerV2::UseClusters(const AliKalmanTrack *t, Int_t from) const {
1144 //--------------------------------------------------------------------
1145 // This function marks clusters assigned to the track
1146 //--------------------------------------------------------------------
1147 AliTracker::UseClusters(t,from);
1149 Int_t clusterIndex = t->GetClusterIndex(0);
1150 AliITSRecPoint *c= 0x0;
1152 if (clusterIndex>-1)
1153 c = (AliITSRecPoint *)GetCluster(clusterIndex);
1154 if (c && c->GetSigmaZ2()>0.1) c->UnUse();
1157 clusterIndex = t->GetClusterIndex(1);
1158 if (clusterIndex>-1)
1159 c=(AliITSRecPoint *)GetCluster(clusterIndex);
1160 if (c && c->GetSigmaZ2()>0.1) c->UnUse();