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;
287 t=new AliITStrackV2(*esd);
288 } catch (const Char_t *msg) {
289 Warning("Clusters2Tracks",msg);
293 if (TMath::Abs(t->GetD(GetX(),GetY()))>4) {
298 if (CorrectForDeadZoneMaterial(t)!=0) {
299 Warning("Clusters2Tracks",
300 "failed to correct for the material in the dead zone !\n");
304 itsTracks.AddLast(t);
306 } /* End Read ESD tracks */
309 Int_t nentr=itsTracks.GetEntriesFast();
312 for (fPass=0; fPass<2; fPass++) {
313 Int_t &constraint=fConstraint[fPass]; if (constraint<0) continue;
314 for (Int_t i=0; i<nentr; i++) {
315 AliITStrackV2 *t=(AliITStrackV2*)itsTracks.UncheckedAt(i);
316 if (t==0) continue; //this track has been already tracked
317 Int_t tpcLabel=t->GetLabel(); //save the TPC track label
319 ResetTrackToFollow(*t);
322 for (FollowProlongation(); fI<AliITSgeomTGeo::GetNLayers(); fI++) {
323 while (TakeNextProlongation()) FollowProlongation();
326 if (fBestTrack.GetNumberOfClusters() == 0) continue;
328 if (fConstraint[fPass]) {
329 ResetTrackToFollow(*t);
330 if (!RefitAt(3.7, &fTrackToFollow, &fBestTrack)) continue;
334 fBestTrack.SetLabel(tpcLabel);
335 fBestTrack.CookdEdx();
336 CookLabel(&fBestTrack,0.); //For comparison only
337 fBestTrack.UpdateESDtrack(AliESDtrack::kITSin);
338 UseClusters(&fBestTrack);
339 delete itsTracks.RemoveAt(i);
346 Info("Clusters2Tracks","Number of prolonged tracks: %d\n",ntrk);
351 Int_t AliITStrackerV2::PropagateBack(AliESDEvent *event) {
352 //--------------------------------------------------------------------
353 // This functions propagates reconstructed ITS tracks back
354 // The clusters must be loaded !
355 //--------------------------------------------------------------------
356 Int_t nentr=event->GetNumberOfTracks();
357 Info("PropagateBack", "Number of ESD tracks: %d\n", nentr);
360 for (Int_t i=0; i<nentr; i++) {
361 AliESDtrack *esd=event->GetTrack(i);
363 if ((esd->GetStatus()&AliESDtrack::kITSin)==0) continue;
364 if (esd->GetStatus()&AliESDtrack::kITSout) continue;
368 t=new AliITStrackV2(*esd);
369 } catch (const Char_t *msg) {
370 Warning("PropagateBack",msg);
375 ResetTrackToFollow(*t);
377 // propagete to vertex [SR, GSI 17.02.2003]
378 // Start Time measurement [SR, GSI 17.02.2003], corrected by I.Belikov
379 if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) {
380 if (fTrackToFollow.PropagateToVertex(event->GetVertex())) {
381 fTrackToFollow.StartTimeIntegral();
383 fTrackToFollow.PropagateTo(3.,-0.0028,65.19);
386 fTrackToFollow.ResetCovariance(10.); fTrackToFollow.ResetClusters();
387 if (RefitAt(49.,&fTrackToFollow,t)) {
388 if (CorrectForDeadZoneMaterial(&fTrackToFollow)!=0) {
389 Warning("PropagateBack",
390 "failed to correct for the material in the dead zone !\n");
394 fTrackToFollow.SetLabel(t->GetLabel());
395 //fTrackToFollow.CookdEdx();
396 CookLabel(&fTrackToFollow,0.); //For comparison only
397 fTrackToFollow.UpdateESDtrack(AliESDtrack::kITSout);
398 UseClusters(&fTrackToFollow);
404 Info("PropagateBack","Number of back propagated ITS tracks: %d\n",ntrk);
409 Int_t AliITStrackerV2::RefitInward(AliESDEvent *event) {
410 //--------------------------------------------------------------------
411 // This functions refits ITS tracks using the
412 // "inward propagated" TPC tracks
413 // The clusters must be loaded !
414 //--------------------------------------------------------------------
415 Int_t nentr=event->GetNumberOfTracks();
416 Info("RefitInward", "Number of ESD tracks: %d\n", nentr);
419 for (Int_t i=0; i<nentr; i++) {
420 AliESDtrack *esd=event->GetTrack(i);
422 if ((esd->GetStatus()&AliESDtrack::kITSout) == 0) continue;
423 if (esd->GetStatus()&AliESDtrack::kITSrefit) continue;
424 if (esd->GetStatus()&AliESDtrack::kTPCout)
425 if ((esd->GetStatus()&AliESDtrack::kTPCrefit)==0) continue;
429 t=new AliITStrackV2(*esd);
430 } catch (const Char_t *msg) {
431 Warning("RefitInward",msg);
436 if (CorrectForDeadZoneMaterial(t)!=0) {
437 Warning("RefitInward",
438 "failed to correct for the material in the dead zone !\n");
443 ResetTrackToFollow(*t);
444 fTrackToFollow.ResetClusters();
447 if (RefitAt(3.7, &fTrackToFollow, t, kTRUE)) {
448 fTrackToFollow.SetLabel(t->GetLabel());
449 fTrackToFollow.CookdEdx();
450 CookLabel(&fTrackToFollow,0.); //For comparison only
452 if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) {//The beam pipe
453 fTrackToFollow.UpdateESDtrack(AliESDtrack::kITSrefit);
454 AliESDtrack *esdTrack =fTrackToFollow.GetESDtrack();
455 Double_t r[3]={0.,0.,0.};
457 esdTrack->RelateToVertex(event->GetVertex(),GetBz(r),maxD);
464 Info("RefitInward","Number of refitted tracks: %d\n",ntrk);
469 AliCluster *AliITStrackerV2::GetCluster(Int_t index) const {
470 //--------------------------------------------------------------------
471 // Return pointer to a given cluster
472 //--------------------------------------------------------------------
473 Int_t l=(index & 0xf0000000) >> 28;
474 Int_t c=(index & 0x0fffffff) >> 00;
475 return fgLayers[l].GetCluster(c);
479 void AliITStrackerV2::FollowProlongation() {
480 //--------------------------------------------------------------------
481 //This function finds a track prolongation
482 //--------------------------------------------------------------------
483 while (fI>fLastLayerToTrackTo) {
486 AliITSlayer &layer=fgLayers[i];
487 AliITStrackV2 &track=fTracks[i];
489 Double_t r=layer.GetR();
492 Double_t rs=0.5*(fgLayers[i+1].GetR() + r);
493 Double_t d=0.0034, x0=38.6;
494 if (i==1) {rs=9.; d=0.0097; x0=42;}
495 if (!fTrackToFollow.PropagateTo(rs,d,x0)) {
496 //Warning("FollowProlongation","propagation failed !\n");
503 if (!fTrackToFollow.GetPhiZat(r,phi,z)) {
504 //Warning("FollowProlongation","failed to estimate track !\n");
508 Int_t idet=layer.FindDetectorIndex(phi,z);
510 //Warning("FollowProlongation","failed to find a detector !\n");
514 //propagate to the intersection
515 const AliITSdetector &det=layer.GetDetector(idet);
517 if (!fTrackToFollow.Propagate(phi,det.GetR())) {
518 //Warning("FollowProlongation","propagation failed !\n");
521 fTrackToFollow.SetDetectorIndex(idet);
523 //Select possible prolongations and store the current track estimation
524 track.~AliITStrackV2(); new(&track) AliITStrackV2(fTrackToFollow);
525 Double_t dz=7*TMath::Sqrt(track.GetSigmaZ2() + AliITSReconstructor::GetRecoParam()->GetSigmaZ2(i));
526 Double_t dy=7*TMath::Sqrt(track.GetSigmaY2() + AliITSReconstructor::GetRecoParam()->GetSigmaY2(i));
527 Double_t road=layer.GetRoad();
528 if (dz*dy>road*road) {
529 Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd;
530 dz=road*scz; dy=road*scy;
533 //Double_t dz=4*TMath::Sqrt(track.GetSigmaZ2() + AliITSReconstructor::GetRecoParam()->GetSigmaZ2(i));
534 if (dz < 0.5*TMath::Abs(track.GetTgl())) dz=0.5*TMath::Abs(track.GetTgl());
535 if (dz > AliITSReconstructor::GetRecoParam()->GetMaxRoad()) {
536 //Warning("FollowProlongation","too broad road in Z !\n");
540 if (TMath::Abs(fTrackToFollow.GetZ()-GetZ()) > r+dz) return;
542 //Double_t dy=4*TMath::Sqrt(track.GetSigmaY2() + AliITSReconstructor::GetRecoParam()->GetSigmaY2(i));
543 if (dy < 0.5*TMath::Abs(track.GetSnp())) dy=0.5*TMath::Abs(track.GetSnp());
544 if (dy > AliITSReconstructor::GetRecoParam()->GetMaxRoad()) {
545 //Warning("FollowProlongation","too broad road in Y !\n");
551 Double_t zmin=track.GetZ() - dz;
552 Double_t zmax=track.GetZ() + dz;
553 Double_t ymin=track.GetY() + r*phi - dy;
554 Double_t ymax=track.GetY() + r*phi + dy;
555 if (layer.SelectClusters(zmin,zmax,ymin,ymax)==0)
556 if (fLayersNotToSkip[fI]) return;
558 if (!TakeNextProlongation())
559 if (fLayersNotToSkip[fI]) return;
563 //deal with the best track
564 Int_t ncl=fTrackToFollow.GetNumberOfClusters();
565 Int_t nclb=fBestTrack.GetNumberOfClusters();
568 Double_t chi2=fTrackToFollow.GetChi2();
569 if (chi2/ncl < AliITSReconstructor::GetRecoParam()->GetChi2PerCluster()) {
570 if (ncl > nclb || chi2 < fBestTrack.GetChi2()) {
578 Int_t AliITStrackerV2::TakeNextProlongation() {
579 //--------------------------------------------------------------------
580 // This function takes another track prolongation
582 // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch
583 //--------------------------------------------------------------------
584 AliITSlayer &layer=fgLayers[fI];
585 ResetTrackToFollow(fTracks[fI]);
587 Double_t dz=7*TMath::Sqrt(fTrackToFollow.GetSigmaZ2() + AliITSReconstructor::GetRecoParam()->GetSigmaZ2(fI));
588 Double_t dy=7*TMath::Sqrt(fTrackToFollow.GetSigmaY2() + AliITSReconstructor::GetRecoParam()->GetSigmaY2(fI));
589 Double_t road=layer.GetRoad();
590 if (dz*dy>road*road) {
591 Double_t dd=TMath::Sqrt(dz*dy), scz=dz/dd, scy=dy/dd;
592 dz=road*scz; dy=road*scy;
595 const AliITSRecPoint *c=0; Int_t ci=-1;
596 const AliITSRecPoint *cc=0; Int_t cci=-1;
597 Double_t chi2=AliITSReconstructor::GetRecoParam()->GetMaxChi2();
598 while ((c=layer.GetNextCluster(ci))!=0) {
599 Int_t idet=c->GetDetectorIndex();
601 if (fTrackToFollow.GetDetectorIndex()!=idet) {
602 const AliITSdetector &det=layer.GetDetector(idet);
603 ResetTrackToFollow(fTracks[fI]);
604 if (!fTrackToFollow.Propagate(det.GetPhi(),det.GetR())) {
605 //Warning("TakeNextProlongation","propagation failed !\n");
608 fTrackToFollow.SetDetectorIndex(idet);
609 if (TMath::Abs(fTrackToFollow.GetZ()-GetZ())>layer.GetR()+dz) continue;
612 if (TMath::Abs(fTrackToFollow.GetZ() - c->GetZ()) > dz) continue;
613 if (TMath::Abs(fTrackToFollow.GetY() - c->GetY()) > dy) continue;
615 Double_t ch2=fTrackToFollow.GetPredictedChi2(c);
616 if (ch2 > chi2) continue;
624 {// Take into account the mis-alignment
625 Double_t x = fTrackToFollow.GetX() + cc->GetX();
626 if (!fTrackToFollow.PropagateTo(x,0.,0.)) return 0;
628 if (!fTrackToFollow.Update(cc,chi2,(fI<<28)+cci)) {
629 //Warning("TakeNextProlongation","filtering failed !\n");
633 if (fTrackToFollow.GetNumberOfClusters()>1)
634 if (TMath::Abs(fTrackToFollow.GetD(GetX(),GetY()))>4) return 0;
637 SetSampledEdx(cc->GetQ(),fI-2); //b.b.
641 Double_t d=layer.GetThickness(fTrackToFollow.GetY(),fTrackToFollow.GetZ(),x0);
642 fTrackToFollow.CorrectForMaterial(d,x0);
645 if (fConstraint[fPass]) {
646 Double_t d=GetEffectiveThickness(0,0); //Think of this !!!!
647 Double_t xyz[]={GetX(),GetY(),GetZ()};
648 Double_t ers[]={GetSigmaX(),GetSigmaY(),GetSigmaZ()};
649 fTrackToFollow.Improve(d,xyz,ers);
656 AliITStrackerV2::AliITSlayer::AliITSlayer():
664 fRoad(2*fR*TMath::Sqrt(3.14/1.)) //assuming that there's only one cluster
666 //--------------------------------------------------------------------
667 //default AliITSlayer constructor
668 //--------------------------------------------------------------------
670 for (Int_t i=0; i<kNsector; i++) fN[i]=0;
674 AliITStrackerV2::AliITSlayer::
675 AliITSlayer(Double_t r,Double_t p,Double_t z,Int_t nl,Int_t nd):
681 fDetectors(new AliITSdetector[nl*nd]),
683 fRoad(2*r*TMath::Sqrt(3.14/1.)) //assuming that there's only one cluster
685 //--------------------------------------------------------------------
686 //main AliITSlayer constructor
687 //--------------------------------------------------------------------
689 for (Int_t i=0; i<kNsector; i++) fN[i]=0;
691 for (Int_t i=0; i<AliITSRecoParam::fgkMaxClusterPerLayer; i++) fClusters[i]=0;
695 AliITStrackerV2::AliITSlayer::~AliITSlayer() {
696 //--------------------------------------------------------------------
697 // AliITSlayer destructor
698 //--------------------------------------------------------------------
703 void AliITStrackerV2::AliITSlayer::ResetClusters() {
704 //--------------------------------------------------------------------
705 // This function removes loaded clusters
706 //--------------------------------------------------------------------
707 for (Int_t s=0; s<kNsector; s++) {
711 delete fClusters[s*kMaxClusterPerSector+n];
716 void AliITStrackerV2::AliITSlayer::ResetRoad() {
717 //--------------------------------------------------------------------
718 // This function calculates the road defined by the cluster density
719 //--------------------------------------------------------------------
721 for (Int_t s=0; s<kNsector; s++) {
724 if (TMath::Abs(fClusters[s*kMaxClusterPerSector+i]->GetZ())<fR) n++;
726 if (n>1) fRoad=2*fR*TMath::Sqrt(3.14/n);
729 Int_t AliITStrackerV2::AliITSlayer::InsertCluster(AliITSRecPoint *c) {
730 //--------------------------------------------------------------------
731 // This function inserts a cluster to this layer in increasing
732 // order of the cluster's fZ
733 //--------------------------------------------------------------------
734 Float_t circ=TMath::TwoPi()*fR;
735 Int_t sec=Int_t(kNsector*c->GetPhiR()/circ);
737 ::Error("InsertCluster","Wrong sector !\n");
741 if (n>=kMaxClusterPerSector) {
742 ::Error("InsertCluster","Too many clusters !\n");
745 if (n==0) fClusters[sec*kMaxClusterPerSector]=c;
747 Int_t i=FindClusterIndex(c->GetZ(),sec);
748 Int_t k=n-i+sec*kMaxClusterPerSector;
749 memmove(fClusters+i+1 ,fClusters+i,k*sizeof(AliITSRecPoint*));
757 AliITStrackerV2::AliITSlayer::FindClusterIndex(Float_t z,Int_t s) const {
758 //--------------------------------------------------------------------
759 // For the sector "s", this function returns the index of the first
760 // with its fZ >= "z".
761 //--------------------------------------------------------------------
763 if (nc==0) return kMaxClusterPerSector*s;
765 Int_t b=kMaxClusterPerSector*s;
766 if (z <= fClusters[b]->GetZ()) return b;
769 if (z > fClusters[e]->GetZ()) return e+1;
772 for (; b<e; m=(b+e)/2) {
773 if (z > fClusters[m]->GetZ()) b=m+1;
779 Int_t AliITStrackerV2::AliITSlayer::
780 SelectClusters(Float_t zmin,Float_t zmax,Float_t ymin, Float_t ymax) {
781 //--------------------------------------------------------------------
782 // This function selects clusters within the "window"
783 //--------------------------------------------------------------------
784 Float_t circ=fR*TMath::TwoPi();
786 if (ymin>circ) ymin-=circ; else if (ymin<0) ymin+=circ;
787 if (ymax>circ) ymax-=circ; else if (ymax<0) ymax+=circ;
789 Int_t i1=Int_t(kNsector*ymin/circ); if (i1==kNsector) i1--;
791 Float_t ym = (ymax<ymin) ? ymax+circ : ymax;
792 Int_t i=FindClusterIndex(zmin,i1), imax=i1*kMaxClusterPerSector+fN[i1];
793 for (; i<imax; i++) {
794 AliITSRecPoint *c=fClusters[i];
795 if (c->IsUsed()) continue;
796 if (c->GetZ()>zmax) break;
797 if (c->GetPhiR()<=ymin) continue;
798 if (c->GetPhiR()>ym) continue;
803 Int_t i2=Int_t(kNsector*ymax/circ); if (i2==kNsector) i2--;
804 if (i2==i1) return fNsel;
807 Float_t ym = (ymin>ymax) ? ymin-circ : ymin;
808 Int_t i=FindClusterIndex(zmin,i2), imax=i2*kMaxClusterPerSector+fN[i2];
809 for (; i<imax; i++) {
810 AliITSRecPoint *c=fClusters[i];
811 if (c->IsUsed()) continue;
812 if (c->GetZ()>zmax) break;
813 if (c->GetPhiR()<=ym) continue;
814 if (c->GetPhiR()>ymax) continue;
822 const AliITSRecPoint *AliITStrackerV2::AliITSlayer::GetNextCluster(Int_t &ci){
823 //--------------------------------------------------------------------
824 // This function returns clusters within the "window"
825 //--------------------------------------------------------------------
836 Int_t AliITStrackerV2::AliITSlayer::GetNumberOfClusters() const {
838 for (Int_t s=0; s<kNsector; s++) n+=fN[s];
843 AliITStrackerV2::AliITSlayer::FindDetectorIndex(Double_t phi,Double_t z)const {
844 //--------------------------------------------------------------------
845 //This function finds the detector crossed by the track
846 //--------------------------------------------------------------------
848 if (fZOffset<0) // old geometry
849 dphi = -(phi-fPhiOffset);
851 dphi = phi-fPhiOffset;
853 if (dphi < 0) dphi += 2*TMath::Pi();
854 else if (dphi >= 2*TMath::Pi()) dphi -= 2*TMath::Pi();
855 Int_t np=Int_t(dphi*fNladders*0.5/TMath::Pi()+0.5);
856 if (np>=fNladders) np-=fNladders;
857 if (np<0) np+=fNladders;
859 Double_t dz=fZOffset-z;
860 Int_t nz=Int_t(dz*(fNdetectors-1)*0.5/fZOffset+0.5);
861 if (nz>=fNdetectors) return -1;
864 return np*fNdetectors + nz;
868 AliITStrackerV2::AliITSlayer::GetThickness(Double_t y,Double_t z,Double_t &x0)
870 //--------------------------------------------------------------------
871 //This function returns the layer thickness at this point (units X0)
872 //--------------------------------------------------------------------
876 if (43<fR&&fR<45) { //SSD2
879 if (TMath::Abs(y-0.00)>3.40) d+=dd;
880 if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);}
881 if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);}
882 for (Int_t i=0; i<12; i++) {
883 if (TMath::Abs(z-3.9*(i+0.5))<0.15) {
884 if (TMath::Abs(y-0.00)>3.40) d+=dd;
888 if (TMath::Abs(z+3.9*(i+0.5))<0.15) {
889 if (TMath::Abs(y-0.00)>3.40) d+=dd;
893 if (TMath::Abs(z-3.4-3.9*i)<0.50) {d+=(0.016-0.0034); break;}
894 if (TMath::Abs(z+0.5+3.9*i)<0.50) {d+=(0.016-0.0034); break;}
897 if (37<fR&&fR<41) { //SSD1
900 if (TMath::Abs(y-0.00)>3.40) d+=dd;
901 if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);}
902 if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);}
903 for (Int_t i=0; i<11; i++) {
904 if (TMath::Abs(z-3.9*i)<0.15) {
905 if (TMath::Abs(y-0.00)>3.40) d+=dd;
909 if (TMath::Abs(z+3.9*i)<0.15) {
910 if (TMath::Abs(y-0.00)>3.40) d+=dd;
914 if (TMath::Abs(z-1.85-3.9*i)<0.50) {d+=(0.016-0.0034); break;}
915 if (TMath::Abs(z+2.05+3.9*i)<0.50) {d+=(0.016-0.0034); break;}
918 if (13<fR&&fR<26) { //SDD
921 if (TMath::Abs(y-0.00)>3.30) d+=dd;
923 if (TMath::Abs(y-1.80)<0.55) {
925 for (Int_t j=0; j<20; j++) {
926 if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;}
927 if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;}
930 if (TMath::Abs(y+1.80)<0.55) {
932 for (Int_t j=0; j<20; j++) {
933 if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;}
934 if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;}
938 for (Int_t i=0; i<4; i++) {
939 if (TMath::Abs(z-7.3*i)<0.60) {
941 if (TMath::Abs(y-0.00)>3.30) d+=dd;
944 if (TMath::Abs(z+7.3*i)<0.60) {
946 if (TMath::Abs(y-0.00)>3.30) d+=dd;
951 if (6<fR&&fR<8) { //SPD2
952 Double_t dd=0.0063; x0=21.5;
954 if (TMath::Abs(y-3.08)>0.5) d+=dd;
955 //if (TMath::Abs(y-3.08)>0.45) d+=dd;
956 if (TMath::Abs(y-3.03)<0.10) {d+=0.014;}
958 if (3<fR&&fR<5) { //SPD1
959 Double_t dd=0.0063; x0=21.5;
961 if (TMath::Abs(y+0.21)>0.6) d+=dd;
962 //if (TMath::Abs(y+0.21)>0.45) d+=dd;
963 if (TMath::Abs(y+0.10)<0.10) {d+=0.014;}
969 Double_t AliITStrackerV2::GetEffectiveThickness(Double_t y,Double_t z) const
971 //--------------------------------------------------------------------
972 //Returns the thickness between the current layer and the vertex (units X0)
973 //--------------------------------------------------------------------
974 Double_t d=0.0028*3*3; //beam pipe
977 Double_t xn=fgLayers[fI].GetR();
978 for (Int_t i=0; i<fI; i++) {
979 Double_t xi=fgLayers[i].GetR();
980 d+=fgLayers[i].GetThickness(y,z,x0)*xi*xi;
989 Double_t xi=0.5*(fgLayers[3].GetR()+fgLayers[4].GetR());
996 Bool_t AliITStrackerV2::RefitAt(Double_t xx,AliITStrackV2 *t,
997 const AliITStrackV2 *c, Bool_t extra) {
998 //--------------------------------------------------------------------
999 // This function refits the track "t" at the position "x" using
1000 // the clusters from "c"
1001 // If "extra"==kTRUE,
1002 // the clusters from overlapped modules get attached to "t"
1003 //--------------------------------------------------------------------
1004 Int_t index[AliITSgeomTGeo::kNLayers];
1006 for (k=0; k<AliITSgeomTGeo::GetNLayers(); k++) index[k]=-1;
1007 Int_t nc=c->GetNumberOfClusters();
1008 for (k=0; k<nc; k++) {
1009 Int_t idx=c->GetClusterIndex(k),nl=(idx&0xf0000000)>>28;
1013 Int_t from, to, step;
1014 if (xx > t->GetX()) {
1015 from=0; to=AliITSgeomTGeo::GetNLayers();
1018 from=AliITSgeomTGeo::GetNLayers()-1; to=-1;
1022 for (Int_t i=from; i != to; i += step) {
1023 AliITSlayer &layer=fgLayers[i];
1024 Double_t r=layer.GetR();
1027 Double_t hI=i-0.5*step;
1028 if (TMath::Abs(hI-1.5)<0.01 || TMath::Abs(hI-3.5)<0.01) {
1029 Double_t rs=0.5*(fgLayers[i-step].GetR() + r);
1030 Double_t d=0.0034, x0=38.6;
1031 if (TMath::Abs(hI-1.5)<0.01) {rs=9.; d=0.0097; x0=42;}
1032 if (!t->PropagateTo(rs,-step*d,x0)) {
1038 // remember old position [SR, GSI 18.02.2003]
1039 Double_t oldX=0., oldY=0., oldZ=0.;
1040 if (t->IsStartedTimeIntegral() && step==1) {
1041 t->GetGlobalXYZat(t->GetX(),oldX,oldY,oldZ);
1046 if (!t->GetPhiZat(r,phi,z)) {
1050 Int_t idet=layer.FindDetectorIndex(phi,z);
1054 const AliITSdetector &det=layer.GetDetector(idet);
1056 if (!t->Propagate(phi,det.GetR())) {
1059 t->SetDetectorIndex(idet);
1061 const AliITSRecPoint *cl=0;
1062 Double_t maxchi2=AliITSReconstructor::GetRecoParam()->GetMaxChi2();
1066 const AliITSRecPoint *ccc=(AliITSRecPoint *)GetCluster(idx);
1067 if (idet != ccc->GetDetectorIndex()) {
1068 idet=ccc->GetDetectorIndex();
1069 const AliITSdetector &det2=layer.GetDetector(idet);
1070 if (!t->Propagate(det2.GetPhi(),det2.GetR())) {
1073 t->SetDetectorIndex(idet);
1075 Double_t chi2=t->GetPredictedChi2(ccc);
1085 // Take into account the mis-alignment
1086 Double_t x=t->GetX()+cl->GetX();
1087 if (!t->PropagateTo(x,0.,0.)) return kFALSE;
1088 if (!t->Update(cl,maxchi2,idx)) {
1091 t->SetSampledEdx(cl->GetQ(),i-2);
1096 Double_t d=layer.GetThickness(t->GetY(),t->GetZ(),x0);
1097 t->CorrectForMaterial(-step*d,x0);
1100 if (extra) { //search for extra clusters
1101 AliITStrackV2 tmp(*t);
1102 Double_t dz=4*TMath::Sqrt(tmp.GetSigmaZ2()+AliITSReconstructor::GetRecoParam()->GetSigmaZ2(i));
1103 if (dz < 0.5*TMath::Abs(tmp.GetTgl())) dz=0.5*TMath::Abs(tmp.GetTgl());
1104 Double_t dy=4*TMath::Sqrt(t->GetSigmaY2()+AliITSReconstructor::GetRecoParam()->GetSigmaY2(i));
1105 if (dy < 0.5*TMath::Abs(tmp.GetSnp())) dy=0.5*TMath::Abs(tmp.GetSnp());
1106 Double_t zmin=t->GetZ() - dz;
1107 Double_t zmax=t->GetZ() + dz;
1108 Double_t ymin=t->GetY() + phi*r - dy;
1109 Double_t ymax=t->GetY() + phi*r + dy;
1110 layer.SelectClusters(zmin,zmax,ymin,ymax);
1112 const AliITSRecPoint *cx=0; Int_t ci=-1,cci=-1;
1113 maxchi2=1000.*AliITSReconstructor::GetRecoParam()->GetMaxChi2();
1114 Double_t tolerance=0.1;
1115 while ((cx=layer.GetNextCluster(ci))!=0) {
1116 if (idet == cx->GetDetectorIndex()) continue;
1118 const AliITSdetector &detx=layer.GetDetector(cx->GetDetectorIndex());
1120 if (!tmp.Propagate(detx.GetPhi(),detx.GetR())) continue;
1122 if (TMath::Abs(tmp.GetZ() - cx->GetZ()) > tolerance) continue;
1123 if (TMath::Abs(tmp.GetY() - cx->GetY()) > tolerance) continue;
1125 Double_t chi2=tmp.GetPredictedChi2(cx);
1126 if (chi2<maxchi2) { maxchi2=chi2; cci=ci; }
1128 if (cci>=0) t->SetExtraCluster(i,(i<<28)+cci);
1131 // track time update [SR, GSI 17.02.2003]
1132 if (t->IsStartedTimeIntegral() && step==1) {
1133 Double_t newX, newY, newZ;
1134 t->GetGlobalXYZat(t->GetX(),newX,newY,newZ);
1135 Double_t dL2 = (oldX-newX)*(oldX-newX) + (oldY-newY)*(oldY-newY) +
1136 (oldZ-newZ)*(oldZ-newZ);
1137 t->AddTimeStep(TMath::Sqrt(dL2));
1143 if (!t->PropagateTo(xx,0.,0.)) return kFALSE;
1147 void AliITStrackerV2::UseClusters(const AliKalmanTrack *t, Int_t from) const {
1148 //--------------------------------------------------------------------
1149 // This function marks clusters assigned to the track
1150 //--------------------------------------------------------------------
1151 AliTracker::UseClusters(t,from);
1153 Int_t clusterIndex = t->GetClusterIndex(0);
1154 AliITSRecPoint *c= 0x0;
1156 if (clusterIndex>-1)
1157 c = (AliITSRecPoint *)GetCluster(clusterIndex);
1158 if (c && c->GetSigmaZ2()>0.1) c->UnUse();
1161 clusterIndex = t->GetClusterIndex(1);
1162 if (clusterIndex>-1)
1163 c=(AliITSRecPoint *)GetCluster(clusterIndex);
1164 if (c && c->GetSigmaZ2()>0.1) c->UnUse();