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.}, xyz[3]={0.};
144 m.LocalToMaster(txyz,xyz);
145 Double_t r=TMath::Sqrt(xyz[0]*xyz[0] + xyz[1]*xyz[1]);
146 Double_t phi=TMath::ATan2(xyz[1],xyz[0]);
148 if (phi<0) phi+=TMath::TwoPi();
149 else if (phi>=TMath::TwoPi()) phi-=TMath::TwoPi();
151 AliITSdetector &det=fgLayers[i-1].GetDetector((j-1)*ndet + k-1);
152 new(&det) AliITSdetector(r,phi);
158 fConstraint[0]=1; fConstraint[1]=0;
160 Double_t xyz[]={AliITSReconstructor::GetRecoParam()->GetXVdef(),
161 AliITSReconstructor::GetRecoParam()->GetYVdef(),
162 AliITSReconstructor::GetRecoParam()->GetZVdef()};
163 Double_t ers[]={AliITSReconstructor::GetRecoParam()->GetSigmaXVdef(),
164 AliITSReconstructor::GetRecoParam()->GetSigmaYVdef(),
165 AliITSReconstructor::GetRecoParam()->GetSigmaZVdef()};
168 for (Int_t i=0; i<AliITSgeomTGeo::GetNLayers(); i++) fLayersNotToSkip[i]=AliITSRecoParam::GetLayersNotToSkip(i);
172 void AliITStrackerV2::SetLayersNotToSkip(Int_t *l) {
173 //--------------------------------------------------------------------
174 //This function set masks of the layers which must be not skipped
175 //--------------------------------------------------------------------
176 for (Int_t i=0; i<AliITSgeomTGeo::GetNLayers(); i++) fLayersNotToSkip[i]=l[i];
179 Int_t AliITStrackerV2::LoadClusters(TTree *cTree) {
180 //--------------------------------------------------------------------
181 //This function loads ITS clusters
182 //--------------------------------------------------------------------
183 TBranch *branch=cTree->GetBranch("ITSRecPoints");
185 Error("LoadClusters"," can't get the branch !\n");
189 TClonesArray dummy("AliITSRecPoint",10000), *clusters=&dummy;
190 branch->SetAddress(&clusters);
193 for (Int_t i=0; i<AliITSgeomTGeo::GetNLayers(); i++) {
194 Int_t ndet=fgLayers[i].GetNdetectors();
195 Int_t jmax = j + fgLayers[i].GetNladders()*ndet;
197 Double_t r=fgLayers[i].GetR();
198 Double_t circ=TMath::TwoPi()*r;
200 for (; j<jmax; j++) {
201 if (!cTree->GetEvent(j)) continue;
202 Int_t ncl=clusters->GetEntriesFast();
205 AliITSRecPoint *c=(AliITSRecPoint*)clusters->UncheckedAt(ncl);
207 if (!c->Misalign()) AliWarning("Can't misalign this cluster !");
209 Int_t idx=c->GetDetectorIndex();
210 AliITSdetector &det=fgLayers[i].GetDetector(idx);
212 Double_t y=r*det.GetPhi()+c->GetY();
213 if (y>circ) y-=circ; else if (y<0) y+=circ;
216 fgLayers[i].InsertCluster(new AliITSRecPoint(*c));
220 fgLayers[i].ResetRoad(); //road defined by the cluster density
226 void AliITStrackerV2::UnloadClusters() {
227 //--------------------------------------------------------------------
228 //This function unloads ITS clusters
229 //--------------------------------------------------------------------
230 for (Int_t i=0; i<AliITSgeomTGeo::GetNLayers(); i++) fgLayers[i].ResetClusters();
233 static Int_t CorrectForDeadZoneMaterial(AliITStrackV2 *t) {
234 //--------------------------------------------------------------------
235 // Correction for the material between the TPC and the ITS
236 // (should it belong to the TPC code ?)
237 //--------------------------------------------------------------------
238 Double_t riw=80., diw=0.0053, x0iw=30; // TPC inner wall ?
239 Double_t rcd=61., dcd=0.0053, x0cd=30; // TPC "central drum" ?
240 Double_t yr=12.8, dr=0.03; // rods ?
241 Double_t zm=0.2, dm=0.40; // membrane
242 //Double_t rr=52., dr=0.19, x0r=24., yyr=7.77; //rails
243 Double_t rs=50., ds=0.001; // something belonging to the ITS (screen ?)
245 if (t->GetX() > riw) {
246 if (!t->PropagateTo(riw,diw,x0iw)) return 1;
247 if (TMath::Abs(t->GetY())>yr) t->CorrectForMaterial(dr);
248 if (TMath::Abs(t->GetZ())<zm) t->CorrectForMaterial(dm);
249 if (!t->PropagateTo(rcd,dcd,x0cd)) return 1;
250 //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z);
251 //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,dr,x0r);
252 if (!t->PropagateTo(rs,ds)) return 1;
253 } else if (t->GetX() < rs) {
254 if (!t->PropagateTo(rs,-ds)) return 1;
255 //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z);
256 //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,-dr,x0r);
257 if (!t->PropagateTo(rcd,-dcd,x0cd)) return 1;
258 if (!t->PropagateTo(riw+0.001,-diw,x0iw)) return 1;
260 ::Error("CorrectForDeadZoneMaterial","track is already in the dead zone !");
267 Int_t AliITStrackerV2::Clusters2Tracks(AliESDEvent *event) {
268 //--------------------------------------------------------------------
269 // This functions reconstructs ITS tracks
270 // The clusters must be already loaded !
271 //--------------------------------------------------------------------
272 TObjArray itsTracks(15000);
274 {/* Read ESD tracks */
275 Int_t nentr=event->GetNumberOfTracks();
276 Info("Clusters2Tracks", "Number of ESD tracks: %d\n", nentr);
278 AliESDtrack *esd=event->GetTrack(nentr);
280 if ((esd->GetStatus()&AliESDtrack::kTPCin)==0) continue;
281 if (esd->GetStatus()&AliESDtrack::kTPCout) continue;
282 if (esd->GetStatus()&AliESDtrack::kITSin) continue;
286 t=new AliITStrackV2(*esd);
287 } catch (const Char_t *msg) {
288 Warning("Clusters2Tracks",msg);
292 if (TMath::Abs(t->GetD(GetX(),GetY()))>4) {
297 if (CorrectForDeadZoneMaterial(t)!=0) {
298 Warning("Clusters2Tracks",
299 "failed to correct for the material in the dead zone !\n");
303 itsTracks.AddLast(t);
305 } /* End Read ESD tracks */
308 Int_t nentr=itsTracks.GetEntriesFast();
311 for (fPass=0; fPass<2; fPass++) {
312 Int_t &constraint=fConstraint[fPass]; if (constraint<0) continue;
313 for (Int_t i=0; i<nentr; i++) {
314 AliITStrackV2 *t=(AliITStrackV2*)itsTracks.UncheckedAt(i);
315 if (t==0) continue; //this track has been already tracked
316 Int_t tpcLabel=t->GetLabel(); //save the TPC track label
318 ResetTrackToFollow(*t);
321 for (FollowProlongation(); fI<AliITSgeomTGeo::GetNLayers(); fI++) {
322 while (TakeNextProlongation()) FollowProlongation();
325 if (fBestTrack.GetNumberOfClusters() == 0) continue;
327 if (fConstraint[fPass]) {
328 ResetTrackToFollow(*t);
329 if (!RefitAt(3.7, &fTrackToFollow, &fBestTrack)) continue;
333 fBestTrack.SetLabel(tpcLabel);
334 fBestTrack.CookdEdx();
335 CookLabel(&fBestTrack,0.); //For comparison only
336 fBestTrack.UpdateESDtrack(AliESDtrack::kITSin);
337 UseClusters(&fBestTrack);
338 delete itsTracks.RemoveAt(i);
345 Info("Clusters2Tracks","Number of prolonged tracks: %d\n",ntrk);
350 Int_t AliITStrackerV2::PropagateBack(AliESDEvent *event) {
351 //--------------------------------------------------------------------
352 // This functions propagates reconstructed ITS tracks back
353 // The clusters must be loaded !
354 //--------------------------------------------------------------------
355 Int_t nentr=event->GetNumberOfTracks();
356 Info("PropagateBack", "Number of ESD tracks: %d\n", nentr);
359 for (Int_t i=0; i<nentr; i++) {
360 AliESDtrack *esd=event->GetTrack(i);
362 if ((esd->GetStatus()&AliESDtrack::kITSin)==0) continue;
363 if (esd->GetStatus()&AliESDtrack::kITSout) continue;
367 t=new AliITStrackV2(*esd);
368 } catch (const Char_t *msg) {
369 Warning("PropagateBack",msg);
374 ResetTrackToFollow(*t);
376 // propagete to vertex [SR, GSI 17.02.2003]
377 // Start Time measurement [SR, GSI 17.02.2003], corrected by I.Belikov
378 if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) {
379 if (fTrackToFollow.PropagateToVertex(event->GetVertex())) {
380 fTrackToFollow.StartTimeIntegral();
382 fTrackToFollow.PropagateTo(3.,-0.0028,65.19);
385 fTrackToFollow.ResetCovariance(10.); fTrackToFollow.ResetClusters();
386 if (RefitAt(49.,&fTrackToFollow,t)) {
387 if (CorrectForDeadZoneMaterial(&fTrackToFollow)!=0) {
388 Warning("PropagateBack",
389 "failed to correct for the material in the dead zone !\n");
393 fTrackToFollow.SetLabel(t->GetLabel());
394 //fTrackToFollow.CookdEdx();
395 CookLabel(&fTrackToFollow,0.); //For comparison only
396 fTrackToFollow.UpdateESDtrack(AliESDtrack::kITSout);
397 UseClusters(&fTrackToFollow);
403 Info("PropagateBack","Number of back propagated ITS tracks: %d\n",ntrk);
408 Int_t AliITStrackerV2::RefitInward(AliESDEvent *event) {
409 //--------------------------------------------------------------------
410 // This functions refits ITS tracks using the
411 // "inward propagated" TPC tracks
412 // The clusters must be loaded !
413 //--------------------------------------------------------------------
414 Int_t nentr=event->GetNumberOfTracks();
415 Info("RefitInward", "Number of ESD tracks: %d\n", nentr);
418 for (Int_t i=0; i<nentr; i++) {
419 AliESDtrack *esd=event->GetTrack(i);
421 if ((esd->GetStatus()&AliESDtrack::kITSout) == 0) continue;
422 if (esd->GetStatus()&AliESDtrack::kITSrefit) continue;
423 if (esd->GetStatus()&AliESDtrack::kTPCout)
424 if ((esd->GetStatus()&AliESDtrack::kTPCrefit)==0) continue;
428 t=new AliITStrackV2(*esd);
429 } catch (const Char_t *msg) {
430 Warning("RefitInward",msg);
435 if (CorrectForDeadZoneMaterial(t)!=0) {
436 Warning("RefitInward",
437 "failed to correct for the material in the dead zone !\n");
442 ResetTrackToFollow(*t);
443 fTrackToFollow.ResetClusters();
446 if (RefitAt(3.7, &fTrackToFollow, t, kTRUE)) {
447 fTrackToFollow.SetLabel(t->GetLabel());
448 fTrackToFollow.CookdEdx();
449 CookLabel(&fTrackToFollow,0.); //For comparison only
451 if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) {//The beam pipe
452 AliESDtrack *esdTrack =fTrackToFollow.GetESDtrack();
453 esdTrack->UpdateTrackParams(&fTrackToFollow,AliESDtrack::kITSrefit);
454 Float_t r[3]={0.,0.,0.};
456 esdTrack->RelateToVertex(event->GetVertex(),GetBz(r),maxD);
463 Info("RefitInward","Number of refitted tracks: %d\n",ntrk);
468 AliCluster *AliITStrackerV2::GetCluster(Int_t index) const {
469 //--------------------------------------------------------------------
470 // Return pointer to a given cluster
471 //--------------------------------------------------------------------
472 Int_t l=(index & 0xf0000000) >> 28;
473 Int_t c=(index & 0x0fffffff) >> 00;
474 return fgLayers[l].GetCluster(c);
478 void AliITStrackerV2::FollowProlongation() {
479 //--------------------------------------------------------------------
480 //This function finds a track prolongation
481 //--------------------------------------------------------------------
482 while (fI>fLastLayerToTrackTo) {
485 AliITSlayer &layer=fgLayers[i];
486 AliITStrackV2 &track=fTracks[i];
488 Double_t r=layer.GetR();
491 Double_t rs=0.5*(fgLayers[i+1].GetR() + r);
492 Double_t d=0.0034, x0=38.6;
493 if (i==1) {rs=9.; d=0.0097; x0=42;}
494 if (!fTrackToFollow.PropagateTo(rs,d,x0)) {
495 //Warning("FollowProlongation","propagation failed !\n");
502 if (!fTrackToFollow.GetPhiZat(r,phi,z)) {
503 //Warning("FollowProlongation","failed to estimate track !\n");
507 Int_t idet=layer.FindDetectorIndex(phi,z);
509 //Warning("FollowProlongation","failed to find a detector !\n");
513 //propagate to the intersection
514 const AliITSdetector &det=layer.GetDetector(idet);
516 if (!fTrackToFollow.Propagate(phi,det.GetR())) {
517 //Warning("FollowProlongation","propagation failed !\n");
520 fTrackToFollow.SetDetectorIndex(idet);
522 //Select possible prolongations and store the current track estimation
523 track.~AliITStrackV2(); new(&track) AliITStrackV2(fTrackToFollow);
524 Double_t dz=7*TMath::Sqrt(track.GetSigmaZ2() + AliITSReconstructor::GetRecoParam()->GetSigmaZ2(i));
525 Double_t dy=7*TMath::Sqrt(track.GetSigmaY2() + AliITSReconstructor::GetRecoParam()->GetSigmaY2(i));
526 Double_t road=layer.GetRoad();
527 if (dz*dy>road*road) {
528 Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd;
529 dz=road*scz; dy=road*scy;
532 //Double_t dz=4*TMath::Sqrt(track.GetSigmaZ2() + AliITSReconstructor::GetRecoParam()->GetSigmaZ2(i));
533 if (dz < 0.5*TMath::Abs(track.GetTgl())) dz=0.5*TMath::Abs(track.GetTgl());
534 if (dz > AliITSReconstructor::GetRecoParam()->GetMaxRoad()) {
535 //Warning("FollowProlongation","too broad road in Z !\n");
539 if (TMath::Abs(fTrackToFollow.GetZ()-GetZ()) > r+dz) return;
541 //Double_t dy=4*TMath::Sqrt(track.GetSigmaY2() + AliITSReconstructor::GetRecoParam()->GetSigmaY2(i));
542 if (dy < 0.5*TMath::Abs(track.GetSnp())) dy=0.5*TMath::Abs(track.GetSnp());
543 if (dy > AliITSReconstructor::GetRecoParam()->GetMaxRoad()) {
544 //Warning("FollowProlongation","too broad road in Y !\n");
550 Double_t zmin=track.GetZ() - dz;
551 Double_t zmax=track.GetZ() + dz;
552 Double_t ymin=track.GetY() + r*phi - dy;
553 Double_t ymax=track.GetY() + r*phi + dy;
554 if (layer.SelectClusters(zmin,zmax,ymin,ymax)==0)
555 if (fLayersNotToSkip[fI]) return;
557 if (!TakeNextProlongation())
558 if (fLayersNotToSkip[fI]) return;
562 //deal with the best track
563 Int_t ncl=fTrackToFollow.GetNumberOfClusters();
564 Int_t nclb=fBestTrack.GetNumberOfClusters();
567 Double_t chi2=fTrackToFollow.GetChi2();
568 if (chi2/ncl < AliITSReconstructor::GetRecoParam()->GetChi2PerCluster()) {
569 if (ncl > nclb || chi2 < fBestTrack.GetChi2()) {
577 Int_t AliITStrackerV2::TakeNextProlongation() {
578 //--------------------------------------------------------------------
579 // This function takes another track prolongation
581 // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch
582 //--------------------------------------------------------------------
583 AliITSlayer &layer=fgLayers[fI];
584 ResetTrackToFollow(fTracks[fI]);
586 Double_t dz=7*TMath::Sqrt(fTrackToFollow.GetSigmaZ2() + AliITSReconstructor::GetRecoParam()->GetSigmaZ2(fI));
587 Double_t dy=7*TMath::Sqrt(fTrackToFollow.GetSigmaY2() + AliITSReconstructor::GetRecoParam()->GetSigmaY2(fI));
588 Double_t road=layer.GetRoad();
589 if (dz*dy>road*road) {
590 Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd;
591 dz=road*scz; dy=road*scy;
594 const AliITSRecPoint *c=0; Int_t ci=-1;
595 const AliITSRecPoint *cc=0; Int_t cci=-1;
596 Double_t chi2=AliITSReconstructor::GetRecoParam()->GetMaxChi2();
597 while ((c=layer.GetNextCluster(ci))!=0) {
598 Int_t idet=c->GetDetectorIndex();
600 if (fTrackToFollow.GetDetectorIndex()!=idet) {
601 const AliITSdetector &det=layer.GetDetector(idet);
602 ResetTrackToFollow(fTracks[fI]);
603 if (!fTrackToFollow.Propagate(det.GetPhi(),det.GetR())) {
604 //Warning("TakeNextProlongation","propagation failed !\n");
607 fTrackToFollow.SetDetectorIndex(idet);
608 if (TMath::Abs(fTrackToFollow.GetZ()-GetZ())>layer.GetR()+dz) continue;
611 if (TMath::Abs(fTrackToFollow.GetZ() - c->GetZ()) > dz) continue;
612 if (TMath::Abs(fTrackToFollow.GetY() - c->GetY()) > dy) continue;
614 Double_t ch2=fTrackToFollow.GetPredictedChi2(c);
615 if (ch2 > chi2) continue;
623 {// Take into account the mis-alignment
624 Double_t x = fTrackToFollow.GetX() + cc->GetX();
625 if (!fTrackToFollow.PropagateTo(x,0.,0.)) return 0;
627 if (!fTrackToFollow.Update(cc,chi2,(fI<<28)+cci)) {
628 //Warning("TakeNextProlongation","filtering failed !\n");
632 if (fTrackToFollow.GetNumberOfClusters()>1)
633 if (TMath::Abs(fTrackToFollow.GetD(GetX(),GetY()))>4) return 0;
636 SetSampledEdx(cc->GetQ(),fTrackToFollow.GetNumberOfClusters()-1); //b.b.
640 Double_t d=layer.GetThickness(fTrackToFollow.GetY(),fTrackToFollow.GetZ(),x0);
641 fTrackToFollow.CorrectForMaterial(d,x0);
644 if (fConstraint[fPass]) {
645 Double_t d=GetEffectiveThickness(0,0); //Think of this !!!!
646 Double_t xyz[]={GetX(),GetY(),GetZ()};
647 Double_t ers[]={GetSigmaX(),GetSigmaY(),GetSigmaZ()};
648 fTrackToFollow.Improve(d,xyz,ers);
655 AliITStrackerV2::AliITSlayer::AliITSlayer():
663 fRoad(2*fR*TMath::Sqrt(3.14/1.)) //assuming that there's only one cluster
665 //--------------------------------------------------------------------
666 //default AliITSlayer constructor
667 //--------------------------------------------------------------------
669 for (Int_t i=0; i<kNsector; i++) fN[i]=0;
673 AliITStrackerV2::AliITSlayer::
674 AliITSlayer(Double_t r,Double_t p,Double_t z,Int_t nl,Int_t nd):
680 fDetectors(new AliITSdetector[nl*nd]),
682 fRoad(2*r*TMath::Sqrt(3.14/1.)) //assuming that there's only one cluster
684 //--------------------------------------------------------------------
685 //main AliITSlayer constructor
686 //--------------------------------------------------------------------
688 for (Int_t i=0; i<kNsector; i++) fN[i]=0;
690 for (Int_t i=0; i<AliITSRecoParam::fgkMaxClusterPerLayer; i++) fClusters[i]=0;
694 AliITStrackerV2::AliITSlayer::~AliITSlayer() {
695 //--------------------------------------------------------------------
696 // AliITSlayer destructor
697 //--------------------------------------------------------------------
702 void AliITStrackerV2::AliITSlayer::ResetClusters() {
703 //--------------------------------------------------------------------
704 // This function removes loaded clusters
705 //--------------------------------------------------------------------
706 for (Int_t s=0; s<kNsector; s++) {
710 delete fClusters[s*kMaxClusterPerSector+n];
715 void AliITStrackerV2::AliITSlayer::ResetRoad() {
716 //--------------------------------------------------------------------
717 // This function calculates the road defined by the cluster density
718 //--------------------------------------------------------------------
720 for (Int_t s=0; s<kNsector; s++) {
723 if (TMath::Abs(fClusters[s*kMaxClusterPerSector+i]->GetZ())<fR) n++;
725 if (n>1) fRoad=2*fR*TMath::Sqrt(3.14/n);
728 Int_t AliITStrackerV2::AliITSlayer::InsertCluster(AliITSRecPoint *c) {
729 //--------------------------------------------------------------------
730 // This function inserts a cluster to this layer in increasing
731 // order of the cluster's fZ
732 //--------------------------------------------------------------------
733 Float_t circ=TMath::TwoPi()*fR;
734 Int_t sec=Int_t(kNsector*c->GetPhiR()/circ);
736 ::Error("InsertCluster","Wrong sector !\n");
740 if (n>=kMaxClusterPerSector) {
741 ::Error("InsertCluster","Too many clusters !\n");
744 if (n==0) fClusters[sec*kMaxClusterPerSector]=c;
746 Int_t i=FindClusterIndex(c->GetZ(),sec);
747 Int_t k=n-i+sec*kMaxClusterPerSector;
748 memmove(fClusters+i+1 ,fClusters+i,k*sizeof(AliITSRecPoint*));
756 AliITStrackerV2::AliITSlayer::FindClusterIndex(Float_t z,Int_t s) const {
757 //--------------------------------------------------------------------
758 // For the sector "s", this function returns the index of the first
759 // with its fZ >= "z".
760 //--------------------------------------------------------------------
762 if (nc==0) return kMaxClusterPerSector*s;
764 Int_t b=kMaxClusterPerSector*s;
765 if (z <= fClusters[b]->GetZ()) return b;
768 if (z > fClusters[e]->GetZ()) return e+1;
771 for (; b<e; m=(b+e)/2) {
772 if (z > fClusters[m]->GetZ()) b=m+1;
778 Int_t AliITStrackerV2::AliITSlayer::
779 SelectClusters(Float_t zmin,Float_t zmax,Float_t ymin, Float_t ymax) {
780 //--------------------------------------------------------------------
781 // This function selects clusters within the "window"
782 //--------------------------------------------------------------------
783 Float_t circ=fR*TMath::TwoPi();
785 if (ymin>circ) ymin-=circ; else if (ymin<0) ymin+=circ;
786 if (ymax>circ) ymax-=circ; else if (ymax<0) ymax+=circ;
788 Int_t i1=Int_t(kNsector*ymin/circ); if (i1==kNsector) i1--;
790 Float_t ym = (ymax<ymin) ? ymax+circ : ymax;
791 Int_t i=FindClusterIndex(zmin,i1), imax=i1*kMaxClusterPerSector+fN[i1];
792 for (; i<imax; i++) {
793 AliITSRecPoint *c=fClusters[i];
794 if (c->IsUsed()) continue;
795 if (c->GetZ()>zmax) break;
796 if (c->GetPhiR()<=ymin) continue;
797 if (c->GetPhiR()>ym) continue;
802 Int_t i2=Int_t(kNsector*ymax/circ); if (i2==kNsector) i2--;
803 if (i2==i1) return fNsel;
806 Float_t ym = (ymin>ymax) ? ymin-circ : ymin;
807 Int_t i=FindClusterIndex(zmin,i2), imax=i2*kMaxClusterPerSector+fN[i2];
808 for (; i<imax; i++) {
809 AliITSRecPoint *c=fClusters[i];
810 if (c->IsUsed()) continue;
811 if (c->GetZ()>zmax) break;
812 if (c->GetPhiR()<=ym) continue;
813 if (c->GetPhiR()>ymax) continue;
821 const AliITSRecPoint *AliITStrackerV2::AliITSlayer::GetNextCluster(Int_t &ci){
822 //--------------------------------------------------------------------
823 // This function returns clusters within the "window"
824 //--------------------------------------------------------------------
835 Int_t AliITStrackerV2::AliITSlayer::GetNumberOfClusters() const {
837 for (Int_t s=0; s<kNsector; s++) n+=fN[s];
842 AliITStrackerV2::AliITSlayer::FindDetectorIndex(Double_t phi,Double_t z)const {
843 //--------------------------------------------------------------------
844 //This function finds the detector crossed by the track
845 //--------------------------------------------------------------------
847 if (fZOffset<0) // old geometry
848 dphi = -(phi-fPhiOffset);
850 dphi = phi-fPhiOffset;
852 if (dphi < 0) dphi += 2*TMath::Pi();
853 else if (dphi >= 2*TMath::Pi()) dphi -= 2*TMath::Pi();
854 Int_t np=Int_t(dphi*fNladders*0.5/TMath::Pi()+0.5);
855 if (np>=fNladders) np-=fNladders;
856 if (np<0) np+=fNladders;
858 Double_t dz=fZOffset-z;
859 Int_t nz=Int_t(dz*(fNdetectors-1)*0.5/fZOffset+0.5);
860 if (nz>=fNdetectors) return -1;
863 return np*fNdetectors + nz;
867 AliITStrackerV2::AliITSlayer::GetThickness(Double_t y,Double_t z,Double_t &x0)
869 //--------------------------------------------------------------------
870 //This function returns the layer thickness at this point (units X0)
871 //--------------------------------------------------------------------
875 if (43<fR&&fR<45) { //SSD2
878 if (TMath::Abs(y-0.00)>3.40) d+=dd;
879 if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);}
880 if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);}
881 for (Int_t i=0; i<12; i++) {
882 if (TMath::Abs(z-3.9*(i+0.5))<0.15) {
883 if (TMath::Abs(y-0.00)>3.40) d+=dd;
887 if (TMath::Abs(z+3.9*(i+0.5))<0.15) {
888 if (TMath::Abs(y-0.00)>3.40) d+=dd;
892 if (TMath::Abs(z-3.4-3.9*i)<0.50) {d+=(0.016-0.0034); break;}
893 if (TMath::Abs(z+0.5+3.9*i)<0.50) {d+=(0.016-0.0034); break;}
896 if (37<fR&&fR<41) { //SSD1
899 if (TMath::Abs(y-0.00)>3.40) d+=dd;
900 if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);}
901 if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);}
902 for (Int_t i=0; i<11; i++) {
903 if (TMath::Abs(z-3.9*i)<0.15) {
904 if (TMath::Abs(y-0.00)>3.40) d+=dd;
908 if (TMath::Abs(z+3.9*i)<0.15) {
909 if (TMath::Abs(y-0.00)>3.40) d+=dd;
913 if (TMath::Abs(z-1.85-3.9*i)<0.50) {d+=(0.016-0.0034); break;}
914 if (TMath::Abs(z+2.05+3.9*i)<0.50) {d+=(0.016-0.0034); break;}
917 if (13<fR&&fR<26) { //SDD
920 if (TMath::Abs(y-0.00)>3.30) d+=dd;
922 if (TMath::Abs(y-1.80)<0.55) {
924 for (Int_t j=0; j<20; j++) {
925 if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;}
926 if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;}
929 if (TMath::Abs(y+1.80)<0.55) {
931 for (Int_t j=0; j<20; j++) {
932 if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;}
933 if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;}
937 for (Int_t i=0; i<4; i++) {
938 if (TMath::Abs(z-7.3*i)<0.60) {
940 if (TMath::Abs(y-0.00)>3.30) d+=dd;
943 if (TMath::Abs(z+7.3*i)<0.60) {
945 if (TMath::Abs(y-0.00)>3.30) d+=dd;
950 if (6<fR&&fR<8) { //SPD2
951 Double_t dd=0.0063; x0=21.5;
953 if (TMath::Abs(y-3.08)>0.5) d+=dd;
954 //if (TMath::Abs(y-3.08)>0.45) d+=dd;
955 if (TMath::Abs(y-3.03)<0.10) {d+=0.014;}
957 if (3<fR&&fR<5) { //SPD1
958 Double_t dd=0.0063; x0=21.5;
960 if (TMath::Abs(y+0.21)>0.6) d+=dd;
961 //if (TMath::Abs(y+0.21)>0.45) d+=dd;
962 if (TMath::Abs(y+0.10)<0.10) {d+=0.014;}
968 Double_t AliITStrackerV2::GetEffectiveThickness(Double_t y,Double_t z) const
970 //--------------------------------------------------------------------
971 //Returns the thickness between the current layer and the vertex (units X0)
972 //--------------------------------------------------------------------
973 Double_t d=0.0028*3*3; //beam pipe
976 Double_t xn=fgLayers[fI].GetR();
977 for (Int_t i=0; i<fI; i++) {
978 Double_t xi=fgLayers[i].GetR();
979 d+=fgLayers[i].GetThickness(y,z,x0)*xi*xi;
988 Double_t xi=0.5*(fgLayers[3].GetR()+fgLayers[4].GetR());
995 Bool_t AliITStrackerV2::RefitAt(Double_t xx,AliITStrackV2 *t,
996 const AliITStrackV2 *c, Bool_t extra) {
997 //--------------------------------------------------------------------
998 // This function refits the track "t" at the position "x" using
999 // the clusters from "c"
1000 // If "extra"==kTRUE,
1001 // the clusters from overlapped modules get attached to "t"
1002 //--------------------------------------------------------------------
1003 Int_t index[AliITSgeomTGeo::kNLayers];
1005 for (k=0; k<AliITSgeomTGeo::GetNLayers(); k++) index[k]=-1;
1006 Int_t nc=c->GetNumberOfClusters();
1007 for (k=0; k<nc; k++) {
1008 Int_t idx=c->GetClusterIndex(k),nl=(idx&0xf0000000)>>28;
1012 Int_t from, to, step;
1013 if (xx > t->GetX()) {
1014 from=0; to=AliITSgeomTGeo::GetNLayers();
1017 from=AliITSgeomTGeo::GetNLayers()-1; to=-1;
1021 for (Int_t i=from; i != to; i += step) {
1022 AliITSlayer &layer=fgLayers[i];
1023 Double_t r=layer.GetR();
1026 Double_t hI=i-0.5*step;
1027 if (TMath::Abs(hI-1.5)<0.01 || TMath::Abs(hI-3.5)<0.01) {
1028 Double_t rs=0.5*(fgLayers[i-step].GetR() + r);
1029 Double_t d=0.0034, x0=38.6;
1030 if (TMath::Abs(hI-1.5)<0.01) {rs=9.; d=0.0097; x0=42;}
1031 if (!t->PropagateTo(rs,-step*d,x0)) {
1037 // remember old position [SR, GSI 18.02.2003]
1038 Double_t oldX=0., oldY=0., oldZ=0.;
1039 if (t->IsStartedTimeIntegral() && step==1) {
1040 t->GetGlobalXYZat(t->GetX(),oldX,oldY,oldZ);
1045 if (!t->GetPhiZat(r,phi,z)) {
1049 Int_t idet=layer.FindDetectorIndex(phi,z);
1053 const AliITSdetector &det=layer.GetDetector(idet);
1055 if (!t->Propagate(phi,det.GetR())) {
1058 t->SetDetectorIndex(idet);
1060 const AliITSRecPoint *cl=0;
1061 Double_t maxchi2=AliITSReconstructor::GetRecoParam()->GetMaxChi2();
1065 const AliITSRecPoint *c=(AliITSRecPoint *)GetCluster(idx);
1066 if (idet != c->GetDetectorIndex()) {
1067 idet=c->GetDetectorIndex();
1068 const AliITSdetector &det=layer.GetDetector(idet);
1069 if (!t->Propagate(det.GetPhi(),det.GetR())) {
1072 t->SetDetectorIndex(idet);
1074 Double_t chi2=t->GetPredictedChi2(c);
1084 // Take into account the mis-alignment
1085 Double_t x=t->GetX()+cl->GetX();
1086 if (!t->PropagateTo(x,0.,0.)) return kFALSE;
1087 if (!t->Update(cl,maxchi2,idx)) {
1090 t->SetSampledEdx(cl->GetQ(),t->GetNumberOfClusters()-1);
1095 Double_t d=layer.GetThickness(t->GetY(),t->GetZ(),x0);
1096 t->CorrectForMaterial(-step*d,x0);
1099 if (extra) { //search for extra clusters
1100 AliITStrackV2 tmp(*t);
1101 Double_t dz=4*TMath::Sqrt(tmp.GetSigmaZ2()+AliITSReconstructor::GetRecoParam()->GetSigmaZ2(i));
1102 if (dz < 0.5*TMath::Abs(tmp.GetTgl())) dz=0.5*TMath::Abs(tmp.GetTgl());
1103 Double_t dy=4*TMath::Sqrt(t->GetSigmaY2()+AliITSReconstructor::GetRecoParam()->GetSigmaY2(i));
1104 if (dy < 0.5*TMath::Abs(tmp.GetSnp())) dy=0.5*TMath::Abs(tmp.GetSnp());
1105 Double_t zmin=t->GetZ() - dz;
1106 Double_t zmax=t->GetZ() + dz;
1107 Double_t ymin=t->GetY() + phi*r - dy;
1108 Double_t ymax=t->GetY() + phi*r + dy;
1109 layer.SelectClusters(zmin,zmax,ymin,ymax);
1111 const AliITSRecPoint *c=0; Int_t ci=-1,cci=-1;
1112 Double_t maxchi2=1000.*AliITSReconstructor::GetRecoParam()->GetMaxChi2(), tolerance=0.1;
1113 while ((c=layer.GetNextCluster(ci))!=0) {
1114 if (idet == c->GetDetectorIndex()) continue;
1116 const AliITSdetector &det=layer.GetDetector(c->GetDetectorIndex());
1118 if (!tmp.Propagate(det.GetPhi(),det.GetR())) continue;
1120 if (TMath::Abs(tmp.GetZ() - c->GetZ()) > tolerance) continue;
1121 if (TMath::Abs(tmp.GetY() - c->GetY()) > tolerance) continue;
1123 Double_t chi2=tmp.GetPredictedChi2(c);
1124 if (chi2<maxchi2) { maxchi2=chi2; cci=ci; }
1126 if (cci>=0) t->SetExtraCluster(i,(i<<28)+cci);
1129 // track time update [SR, GSI 17.02.2003]
1130 if (t->IsStartedTimeIntegral() && step==1) {
1131 Double_t newX, newY, newZ;
1132 t->GetGlobalXYZat(t->GetX(),newX,newY,newZ);
1133 Double_t dL2 = (oldX-newX)*(oldX-newX) + (oldY-newY)*(oldY-newY) +
1134 (oldZ-newZ)*(oldZ-newZ);
1135 t->AddTimeStep(TMath::Sqrt(dL2));
1141 if (!t->PropagateTo(xx,0.,0.)) return kFALSE;
1145 void AliITStrackerV2::UseClusters(const AliKalmanTrack *t, Int_t from) const {
1146 //--------------------------------------------------------------------
1147 // This function marks clusters assigned to the track
1148 //--------------------------------------------------------------------
1149 AliTracker::UseClusters(t,from);
1151 Int_t clusterIndex = t->GetClusterIndex(0);
1152 AliITSRecPoint *c= 0x0;
1154 if (clusterIndex>-1)
1155 c = (AliITSRecPoint *)GetCluster(clusterIndex);
1156 if (c && c->GetSigmaZ2()>0.1) c->UnUse();
1159 clusterIndex = t->GetClusterIndex(1);
1160 if (clusterIndex>-1)
1161 c=(AliITSRecPoint *)GetCluster(clusterIndex);
1162 if (c && c->GetSigmaZ2()>0.1) c->UnUse();