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 AliITSclusterV2 clusters and creates AliITStrackMI tracks
19 // and fills with them the ESD
20 // Origin: Marian Ivanov, CERN, Marian.Ivanov@cern.ch
21 // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch
23 //-------------------------------------------------------------------------
24 #include "AliITSrecoV2.h"
26 #include "AliITSgeom.h"
28 #include "AliITSclusterV2.h"
29 #include "AliITStrackerMI.h"
35 ClassImp(AliITStrackerMI)
36 ClassImp(AliITSRecV0Info)
40 AliITStrackerMI::AliITSlayer AliITStrackerMI::fgLayers[kMaxLayer]; // ITS layers
42 AliITStrackerMI::AliITStrackerMI(const AliITSgeom *geom) : AliTracker() {
43 //--------------------------------------------------------------------
44 //This is the AliITStrackerMI constructor
45 //--------------------------------------------------------------------
46 AliITSgeom *g=(AliITSgeom*)geom;
50 for (i=1; i<kMaxLayer+1; i++) {
51 Int_t nlad=g->GetNladders(i);
52 Int_t ndet=g->GetNdetectors(i);
54 g->GetTrans(i,1,1,x,y,z);
55 Double_t r=TMath::Sqrt(x*x + y*y);
56 Double_t poff=TMath::ATan2(y,x);
59 g->GetTrans(i,1,2,x,y,z);
60 r += TMath::Sqrt(x*x + y*y);
61 g->GetTrans(i,2,1,x,y,z);
62 r += TMath::Sqrt(x*x + y*y);
63 g->GetTrans(i,2,2,x,y,z);
64 r += TMath::Sqrt(x*x + y*y);
67 new (fgLayers+i-1) AliITSlayer(r,poff,zoff,nlad,ndet);
69 for (Int_t j=1; j<nlad+1; j++) {
70 for (Int_t k=1; k<ndet+1; k++) { //Fill this layer with detectors
71 Float_t x,y,zshift; g->GetTrans(i,j,k,x,y,zshift);
72 Double_t rot[9]; g->GetRotMatrix(i,j,k,rot);
74 Double_t phi=TMath::ATan2(rot[1],rot[0])+TMath::Pi();
76 if (i==1) phi+=TMath::Pi();
77 Double_t cp=TMath::Cos(phi), sp=TMath::Sin(phi);
80 AliITSdetector &det=fgLayers[i-1].GetDetector((j-1)*ndet + k-1);
81 new(&det) AliITSdetector(r,phi);
90 fConstraint[0]=1; fConstraint[1]=0;
92 Double_t xyz[]={kXV,kYV,kZV}, ers[]={kSigmaXV,kSigmaYV,kSigmaZV};
95 for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=kLayersNotToSkip[i];
96 fLastLayerToTrackTo=kLastLayerToTrackTo;
100 void AliITStrackerMI::SetLayersNotToSkip(Int_t *l) {
101 //--------------------------------------------------------------------
102 //This function set masks of the layers which must be not skipped
103 //--------------------------------------------------------------------
104 for (Int_t i=0; i<kMaxLayer; i++) fLayersNotToSkip[i]=l[i];
107 Int_t AliITStrackerMI::LoadClusters(TTree *cTree) {
108 //--------------------------------------------------------------------
109 //This function loads ITS clusters
110 //--------------------------------------------------------------------
111 TBranch *branch=cTree->GetBranch("Clusters");
113 Error("LoadClusters"," can't get the branch !\n");
117 TClonesArray dummy("AliITSclusterV2",10000), *clusters=&dummy;
118 branch->SetAddress(&clusters);
122 for (Int_t i=0; i<kMaxLayer; i++) {
123 Int_t ndet=fgLayers[i].GetNdetectors();
124 Int_t jmax = j + fgLayers[i].GetNladders()*ndet;
125 for (; j<jmax; j++) {
126 if (!cTree->GetEvent(j)) continue;
127 Int_t ncl=clusters->GetEntriesFast();
128 SignDeltas(clusters,GetZ());
130 AliITSclusterV2 *c=(AliITSclusterV2*)clusters->UncheckedAt(ncl);
131 detector = c->GetDetectorIndex();
132 fgLayers[i].InsertCluster(new AliITSclusterV2(*c));
135 //add dead zone virtual "cluster"
137 for (Float_t ydead = 0; ydead < 1.31 ; ydead+=(i+1.)*0.018){
138 Int_t lab[4] = {0,0,0,detector};
139 Int_t info[3] = {0,0,0};
140 Float_t hit[5]={0,0,0.004/12.,0.001/12.,0};
141 if (i==0) hit[0] =ydead-0.4;
142 if (i==1) hit[0]=ydead-3.75;
144 if (TMath::Abs(fgLayers[i].GetDetector(detector).GetZmax()-hit[1])<2.)
145 fgLayers[i].InsertCluster(new AliITSclusterV2(lab, hit, info));
147 if (TMath::Abs(fgLayers[i].GetDetector(detector).GetZmax()-hit[1])<2.)
148 fgLayers[i].InsertCluster(new AliITSclusterV2(lab, hit, info));
150 if (TMath::Abs(fgLayers[i].GetDetector(detector).GetZmax()-hit[1])<2.)
151 fgLayers[i].InsertCluster(new AliITSclusterV2(lab, hit, info));
153 if (TMath::Abs(fgLayers[i].GetDetector(detector).GetZmax()-hit[1])<2.)
154 fgLayers[i].InsertCluster(new AliITSclusterV2(lab, hit, info));
156 if (TMath::Abs(fgLayers[i].GetDetector(detector).GetZmax()-hit[1])<2.)
157 fgLayers[i].InsertCluster(new AliITSclusterV2(lab, hit, info));
159 if (TMath::Abs(fgLayers[i].GetDetector(detector).GetZmax()-hit[1])<2.)
160 fgLayers[i].InsertCluster(new AliITSclusterV2(lab, hit, info));
166 fgLayers[i].ResetRoad(); //road defined by the cluster density
167 fgLayers[i].SortClusters();
173 void AliITStrackerMI::UnloadClusters() {
174 //--------------------------------------------------------------------
175 //This function unloads ITS clusters
176 //--------------------------------------------------------------------
177 for (Int_t i=0; i<kMaxLayer; i++) fgLayers[i].ResetClusters();
180 static Int_t CorrectForDeadZoneMaterial(AliITStrackMI *t) {
181 //--------------------------------------------------------------------
182 // Correction for the material between the TPC and the ITS
183 // (should it belong to the TPC code ?)
184 //--------------------------------------------------------------------
185 Double_t riw=80., diw=0.0053, x0iw=30; // TPC inner wall ?
186 Double_t rcd=61., dcd=0.0053, x0cd=30; // TPC "central drum" ?
187 Double_t yr=12.8, dr=0.03; // rods ?
188 Double_t zm=0.2, dm=0.40; // membrane
189 //Double_t rr=52., dr=0.19, x0r=24., yyr=7.77; //rails
190 Double_t rs=50., ds=0.001; // something belonging to the ITS (screen ?)
192 if (t->GetX() > riw) {
193 if (!t->PropagateTo(riw,diw,x0iw)) return 1;
194 if (TMath::Abs(t->GetY())>yr) t->CorrectForMaterial(dr);
195 if (TMath::Abs(t->GetZ())<zm) t->CorrectForMaterial(dm);
196 if (!t->PropagateTo(rcd,dcd,x0cd)) return 1;
197 //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z);
198 //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,dr,x0r);
199 if (!t->PropagateTo(rs,ds)) return 1;
200 } else if (t->GetX() < rs) {
201 if (!t->PropagateTo(rs,-ds)) return 1;
202 //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z);
203 //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,-dr,x0r);
204 if (!t->PropagateTo(rcd,-dcd,x0cd)) return 1;
205 if (!t->PropagateTo(riw+0.001,-diw,x0iw)) return 1;
207 ::Error("CorrectForDeadZoneMaterial","track is already in the dead zone !");
214 Int_t AliITStrackerMI::Clusters2Tracks(AliESD *event) {
215 //--------------------------------------------------------------------
216 // This functions reconstructs ITS tracks
217 // The clusters must be already loaded !
218 //--------------------------------------------------------------------
219 TObjArray itsTracks(15000);
221 {/* Read ESD tracks */
222 Int_t nentr=event->GetNumberOfTracks();
223 Info("Clusters2Tracks", "Number of ESD tracks: %d\n", nentr);
225 AliESDtrack *esd=event->GetTrack(nentr);
227 if ((esd->GetStatus()&AliESDtrack::kTPCin)==0) continue;
228 if (esd->GetStatus()&AliESDtrack::kTPCout) continue;
229 if (esd->GetStatus()&AliESDtrack::kITSin) continue;
233 t=new AliITStrackMI(*esd);
234 } catch (const Char_t *msg) {
235 Warning("Clusters2Tracks",msg);
239 t->fD[0] = t->GetD(GetX(),GetY());
240 t->fD[1] = t->GetZat(GetX())-GetZ();
241 Double_t vdist = TMath::Sqrt(t->fD[0]*t->fD[0]+t->fD[1]*t->fD[1]);
242 if (t->GetMass()<0.13) t->SetMass(0.13957); // MI look to the esd - mass hypothesys !!!!!!!!!!!
244 t->fExpQ = TMath::Max(0.8*t->fESDtrack->GetTPCsignal(),30.);
246 if (TMath::Abs(t->fD[0])>10) {
251 if (TMath::Abs(vdist)>20) {
255 if (TMath::Abs(1/t->Get1Pt())<0.120) {
260 if (CorrectForDeadZoneMaterial(t)!=0) {
261 Warning("Clusters2Tracks",
262 "failed to correct for the material in the dead zone !\n");
266 t->fReconstructed = kFALSE;
267 itsTracks.AddLast(t);
269 } /* End Read ESD tracks */
272 Int_t nentr=itsTracks.GetEntriesFast();
273 fTrackHypothesys.Expand(nentr);
274 MakeCoeficients(nentr);
276 for (fPass=0; fPass<2; fPass++) {
277 Int_t &constraint=fConstraint[fPass]; if (constraint<0) continue;
278 for (Int_t i=0; i<nentr; i++) {
279 // cerr<<fPass<<" "<<i<<'\r';
280 fCurrentEsdTrack = i;
281 AliITStrackMI *t=(AliITStrackMI*)itsTracks.UncheckedAt(i);
282 if (t==0) continue; //this track has been already tracked
283 if (t->fReconstructed&&(t->fNUsed<1.5)) continue; //this track was already "succesfully" reconstructed
284 if ( (TMath::Abs(t->GetD(GetX(),GetY())) >3.) && fConstraint[fPass]) continue;
285 if ( (TMath::Abs(t->GetZat(GetX())-GetZ())>3.) && fConstraint[fPass]) continue;
287 Int_t tpcLabel=t->GetLabel(); //save the TPC track label
289 ResetTrackToFollow(*t);
292 FollowProlongationTree(t,i);
295 SortTrackHypothesys(fCurrentEsdTrack,20,0); //MI change
297 AliITStrackMI * besttrack = GetBestHypothesys(fCurrentEsdTrack,t,15);
298 if (!besttrack) continue;
299 besttrack->SetLabel(tpcLabel);
300 // besttrack->CookdEdx();
302 besttrack->fFakeRatio=1.;
303 CookLabel(besttrack,0.); //For comparison only
304 // besttrack->UpdateESDtrack(AliESDtrack::kITSin);
307 UpdateESDtrack(besttrack,AliESDtrack::kITSin);
309 if ( besttrack->GetNumberOfClusters()<5 && fConstraint[fPass]) {
312 if (besttrack->fChi2MIP[0]+besttrack->fNUsed>3.5) continue;
313 if ( (TMath::Abs(besttrack->fD[0]*besttrack->fD[0]+besttrack->fD[1]*besttrack->fD[1])>0.1) && fConstraint[fPass]) continue;
314 //delete itsTracks.RemoveAt(i);
315 t->fReconstructed = kTRUE;
318 GetBestHypothesysMIP(itsTracks);
321 //GetBestHypothesysMIP(itsTracks);
326 Int_t entries = fTrackHypothesys.GetEntriesFast();
327 for (Int_t ientry=0;ientry<entries;ientry++){
328 TObjArray * array =(TObjArray*)fTrackHypothesys.UncheckedAt(ientry);
329 if (array) array->Delete();
330 delete fTrackHypothesys.RemoveAt(ientry);
333 fTrackHypothesys.Delete();
334 Info("Clusters2Tracks","Number of prolonged tracks: %d\n",ntrk);
340 Int_t AliITStrackerMI::PropagateBack(AliESD *event) {
341 //--------------------------------------------------------------------
342 // This functions propagates reconstructed ITS tracks back
343 // The clusters must be loaded !
344 //--------------------------------------------------------------------
345 Int_t nentr=event->GetNumberOfTracks();
346 Info("PropagateBack", "Number of ESD tracks: %d\n", nentr);
349 for (Int_t i=0; i<nentr; i++) {
350 AliESDtrack *esd=event->GetTrack(i);
352 if ((esd->GetStatus()&AliESDtrack::kITSin)==0) continue;
353 if (esd->GetStatus()&AliESDtrack::kITSout) continue;
357 t=new AliITStrackMI(*esd);
358 } catch (const Char_t *msg) {
359 Warning("PropagateBack",msg);
363 t->fExpQ = TMath::Max(0.8*t->fESDtrack->GetTPCsignal(),30.);
365 ResetTrackToFollow(*t);
367 // propagete to vertex [SR, GSI 17.02.2003]
368 // Start Time measurement [SR, GSI 17.02.2003], corrected by I.Belikov
369 if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) {
370 if (fTrackToFollow.PropagateToVertex()) {
371 fTrackToFollow.StartTimeIntegral();
373 fTrackToFollow.PropagateTo(3.,-0.0028,65.19);
376 fTrackToFollow.ResetCovariance(); 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 AliITStrackerMI::RefitInward(AliESD *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;
419 t=new AliITStrackMI(*esd);
420 } catch (const Char_t *msg) {
421 Warning("RefitInward",msg);
425 t->fExpQ = TMath::Max(0.8*t->fESDtrack->GetTPCsignal(),30.);
426 if (CorrectForDeadZoneMaterial(t)!=0) {
427 Warning("RefitInward",
428 "failed to correct for the material in the dead zone !\n");
433 ResetTrackToFollow(*t);
434 fTrackToFollow.ResetClusters();
436 if ((esd->GetStatus()&AliESDtrack::kTPCin)==0)
437 fTrackToFollow.ResetCovariance();
440 if (RefitAt(3.7, &fTrackToFollow, t)) {
441 fTrackToFollow.SetLabel(t->GetLabel());
442 // fTrackToFollow.CookdEdx();
443 CookdEdx(&fTrackToFollow);
445 CookLabel(&fTrackToFollow,0.0); //For comparison only
447 if (fTrackToFollow.PropagateTo(3.,0.0028,65.19)) {//The beam pipe
448 Double_t a=fTrackToFollow.GetAlpha();
449 Double_t cs=TMath::Cos(a),sn=TMath::Sin(a);
450 Double_t xv= GetX()*cs + GetY()*sn;
451 Double_t yv=-GetX()*sn + GetY()*cs;
453 Double_t c=fTrackToFollow.GetC(), snp=fTrackToFollow.GetSnp();
454 Double_t x=fTrackToFollow.GetX(), y=fTrackToFollow.GetY();
455 Double_t tgfv=-(c*(x-xv)-snp)/(c*(y-yv) + TMath::Sqrt(1.-snp*snp));
456 Double_t fv=TMath::ATan(tgfv);
458 cs=TMath::Cos(fv); sn=TMath::Sin(fv);
460 yv=-xv*sn + yv*cs; xv=x;
462 if (fTrackToFollow.Propagate(fv+a,xv)) {
463 fTrackToFollow.UpdateESDtrack(AliESDtrack::kITSrefit);
464 //UseClusters(&fTrackToFollow);
466 AliITSclusterV2 c; c.SetY(yv); c.SetZ(GetZ());
467 c.SetSigmaY2(GetSigmaY()*GetSigmaY());
468 c.SetSigmaZ2(GetSigmaZ()*GetSigmaZ());
469 Double_t chi2=fTrackToFollow.GetPredictedChi2(&c);
470 //Double_t chi2=GetPredictedChi2MI(&fTrackToFollow,&c,fI);
472 if (fTrackToFollow.Update(&c,-chi2,0))
473 //if (UpdateMI(&fTrackToFollow,&c,-chi2,0))
474 fTrackToFollow.SetConstrainedESDtrack(chi2);
483 Info("RefitInward","Number of refitted tracks: %d\n",ntrk);
488 AliCluster *AliITStrackerMI::GetCluster(Int_t index) const {
489 //--------------------------------------------------------------------
490 // Return pointer to a given cluster
491 //--------------------------------------------------------------------
492 Int_t l=(index & 0xf0000000) >> 28;
493 Int_t c=(index & 0x0fffffff) >> 00;
494 return fgLayers[l].GetCluster(c);
498 void AliITStrackerMI::FollowProlongationTree(AliITStrackMI * otrack, Int_t esdindex)
500 //--------------------------------------------------------------------
501 // Follow prolongation tree
502 //--------------------------------------------------------------------
504 //setup tree of the prolongations
506 static AliITStrackMI tracks[7][100];
507 AliITStrackMI *currenttrack;
508 static AliITStrackMI currenttrack1;
509 static AliITStrackMI currenttrack2;
510 static AliITStrackMI backuptrack;
512 Int_t nindexes[7][100];
513 Float_t normalizedchi2[100];
514 for (Int_t ilayer=0;ilayer<6;ilayer++) ntracks[ilayer]=0;
516 new (&(tracks[6][0])) AliITStrackMI(*otrack);
521 // follow prolongations
522 for (Int_t ilayer=5;ilayer>=0;ilayer--){
524 AliITSlayer &layer=fgLayers[ilayer];
525 Double_t r=layer.GetR();
531 for (Int_t itrack =0;itrack<ntracks[ilayer+1];itrack++){
533 if (ntracks[ilayer]>=100) break;
534 if (tracks[ilayer+1][nindexes[ilayer+1][itrack]].fNSkipped>0) nskipped++;
535 if (tracks[ilayer+1][nindexes[ilayer+1][itrack]].fNUsed>2.) nused++;
536 if (ntracks[ilayer]>15+ilayer){
537 if (itrack>1&&tracks[ilayer+1][nindexes[ilayer+1][itrack]].fNSkipped>0 && nskipped>4+ilayer) continue;
538 if (itrack>1&&tracks[ilayer+1][nindexes[ilayer+1][itrack]].fNUsed>2. && nused>3) continue;
541 new(¤ttrack1) AliITStrackMI(tracks[ilayer+1][nindexes[ilayer+1][itrack]]);
542 if (ilayer==3 || ilayer==1) {
543 Double_t rs=0.5*(fgLayers[ilayer+1].GetR() + r);
544 Double_t d=0.0034, x0=38.6;
545 if (ilayer==1) {rs=9.; d=0.0097; x0=42;}
546 if (!currenttrack1.PropagateTo(rs,d,x0)) {
551 //find intersection with layer
553 if (!currenttrack1.GetGlobalXYZat(r,x,y,z)) {
556 Double_t phi=TMath::ATan2(y,x);
557 Int_t idet=layer.FindDetectorIndex(phi,z);
561 //propagate to the intersection
562 const AliITSdetector &det=layer.GetDetector(idet);
564 new(¤ttrack2) AliITStrackMI(currenttrack1);
565 if (!currenttrack1.Propagate(phi,det.GetR())) {
568 currenttrack2.Propagate(phi,det.GetR()); //
569 currenttrack1.SetDetectorIndex(idet);
570 currenttrack2.SetDetectorIndex(idet);
574 Double_t dz=7.5*TMath::Sqrt(currenttrack1.GetSigmaZ2() + 16.*kSigmaZ2[ilayer]);
575 Double_t dy=7.5*TMath::Sqrt(currenttrack1.GetSigmaY2() + 16.*kSigmaY2[ilayer]);
577 Bool_t isBoundary=kFALSE;
578 if (currenttrack1.GetY()-dy< det.GetYmin()+0.2) isBoundary = kTRUE;
579 if (currenttrack1.GetY()+dy> det.GetYmax()-0.2) isBoundary = kTRUE;
580 if (currenttrack1.GetZ()-dz< det.GetZmin()+0.2) isBoundary = kTRUE;
581 if (currenttrack1.GetZ()+dz> det.GetZmax()-0.2) isBoundary = kTRUE;
583 if (isBoundary){ // track at boundary between detectors
584 Float_t maxtgl = TMath::Abs(currenttrack1.GetTgl());
585 if (maxtgl>1) maxtgl=1;
586 dz = TMath::Sqrt(dz*dz+0.25*maxtgl*maxtgl);
588 Float_t maxsnp = TMath::Abs(currenttrack1.GetSnp());
589 if (maxsnp>0.95) continue;
590 //if (maxsnp>0.5) maxsnp=0.5;
591 dy=TMath::Sqrt(dy*dy+0.25*maxsnp*maxsnp);
594 Double_t zmin=currenttrack1.GetZ() - dz;
595 Double_t zmax=currenttrack1.GetZ() + dz;
596 Double_t ymin=currenttrack1.GetY() + r*phi - dy;
597 Double_t ymax=currenttrack1.GetY() + r*phi + dy;
598 layer.SelectClusters(zmin,zmax,ymin,ymax);
600 // loop over all possible prolongations
602 Double_t msz=1./((currenttrack1.GetSigmaZ2() + 16.*kSigmaZ2[ilayer]));
603 Double_t msy=1./((currenttrack1.GetSigmaY2() + 16.*kSigmaY2[ilayer]));
604 if (fConstraint[fPass]){
611 const AliITSclusterV2 *c=0; Int_t ci=-1;
612 Double_t chi2=12345.;
614 currenttrack = ¤ttrack1;
615 while ((c=layer.GetNextCluster(ci))!=0) {
616 if (ntracks[ilayer]>95) break; //space for skipped clusters
617 Bool_t change =kFALSE;
618 if (c->GetQ()==0 && (deadzone==1)) continue;
619 Int_t idet=c->GetDetectorIndex();
620 if (currenttrack->GetDetectorIndex()!=idet) {
621 const AliITSdetector &det=layer.GetDetector(idet);
623 if (!currenttrack2.GetProlongationFast(det.GetPhi(),det.GetR(),y,z)) continue;
624 Float_t pz = (z - c->GetZ()) , py=(y - c->GetY());
625 if (pz*pz*msz+py*py*msy>1.) continue;
627 new (&backuptrack) AliITStrackMI(currenttrack2);
629 currenttrack =¤ttrack2;
630 if (!currenttrack->Propagate(det.GetPhi(),det.GetR())) {
631 new (currenttrack) AliITStrackMI(backuptrack);
635 currenttrack->SetDetectorIndex(idet);
638 Float_t pz = (currenttrack->GetZ() - c->GetZ()) , py=(currenttrack->GetY() - c->GetY());
639 if (pz*pz*msz+py*py*msy>1.) continue;
642 chi2=GetPredictedChi2MI(currenttrack,c,ilayer);
643 if (chi2<kMaxChi2s[ilayer]){
644 if (c->GetQ()==0) deadzone=1; // take dead zone only once
645 if (ntracks[ilayer]>=100) continue;
646 AliITStrackMI * updatetrack = new (&tracks[ilayer][ntracks[ilayer]]) AliITStrackMI(*currenttrack);
647 updatetrack->fClIndex[ilayer]=0;
649 new (¤ttrack2) AliITStrackMI(backuptrack);
652 if (!UpdateMI(updatetrack,c,chi2,(ilayer<<28)+ci)) continue;
653 updatetrack->SetSampledEdx(c->GetQ(),updatetrack->GetNumberOfClusters()-1); //b.b.
656 updatetrack->fNDeadZone++;
657 updatetrack->fDeadZoneProbability=GetDeadZoneProbability(updatetrack->GetZ(),TMath::Sqrt(updatetrack->GetSigmaZ2()));
660 updatetrack->fNUsed++;
663 Double_t d=layer.GetThickness(updatetrack->GetY(),updatetrack->GetZ(),x0);
664 updatetrack->CorrectForMaterial(d,x0);
665 if (fConstraint[fPass]) {
666 updatetrack->fConstrain = fConstraint[fPass];
668 Double_t d=GetEffectiveThickness(0,0); //Think of this !!!!
669 Double_t xyz[]={GetX(),GetY(),GetZ()};
670 Double_t ptfactor = 1;
671 Double_t ers[]={GetSigmaX()*ptfactor,GetSigmaY()*ptfactor,GetSigmaZ()};
672 Bool_t isPrim = kTRUE;
674 updatetrack->fD[0] = updatetrack->GetD(GetX(),GetY());
675 updatetrack->fD[1] = updatetrack->GetZat(GetX())-GetZ();
676 if ( TMath::Abs(updatetrack->fD[0]/(1.+ilayer))>0.4 || TMath::Abs(updatetrack->fD[1]/(1.+ilayer))>0.4) isPrim=kFALSE;
678 if (isPrim) updatetrack->Improve(d,xyz,ers);
679 } //apply vertex constrain
681 } // create new hypothesy
682 } // loop over possible cluster prolongation
683 // if (fConstraint[fPass]&&itrack<2&¤ttrack1.fNSkipped==0 && deadzone==0){
684 if (itrack<2&¤ttrack1.fNSkipped==0 && deadzone==0&&ntracks[ilayer]<100){
685 AliITStrackMI* vtrack = new (&tracks[ilayer][ntracks[ilayer]]) AliITStrackMI(currenttrack1);
686 vtrack->fClIndex[ilayer]=0;
688 Double_t d=GetEffectiveThickness(0,0); //Think of this !!!!
689 Double_t xyz[]={GetX(),GetY(),GetZ()};
690 Double_t ers[]={GetSigmaX(),GetSigmaY(),GetSigmaZ()};
691 vtrack->Improve(d,xyz,ers);
696 } //loop over track candidates
702 for (Int_t itrack=0;itrack<ntracks[ilayer];itrack++){
703 normalizedchi2[itrack] = NormalizedChi2(&tracks[ilayer][itrack],ilayer);
704 if ( normalizedchi2[itrack]<3+0.5*ilayer) golds++;
705 if (ilayer>4) accepted++;
707 if ( fConstraint[fPass] && normalizedchi2[itrack]<kMaxNormChi2C[ilayer]+1) accepted++;
708 if (!fConstraint[fPass] && normalizedchi2[itrack]<kMaxNormChi2NonC[ilayer]+1) accepted++;
711 TMath::Sort(ntracks[ilayer],normalizedchi2,nindexes[ilayer],kFALSE);
712 ntracks[ilayer] = TMath::Min(accepted,7+2*ilayer);
713 if (ntracks[ilayer]<golds+2+ilayer) ntracks[ilayer]=TMath::Min(golds+2+ilayer,accepted);
714 if (ntracks[ilayer]>90) ntracks[ilayer]=90;
716 //printf("%d\t%d\t%d\t%d\t%d\t%d\n",ntracks[0],ntracks[1],ntracks[2],ntracks[3],ntracks[4],ntracks[5]);
718 for (Int_t i=0;i<TMath::Min(20,ntracks[0]);i++) {
719 AliITStrackMI & track= tracks[0][nindexes[0][i]];
720 if (!fConstraint[fPass]&&track.fNormChi2[0]>7.)continue;
721 AddTrackHypothesys(new AliITStrackMI(track), esdindex);
723 for (Int_t i=0;i<TMath::Min(4,ntracks[1]);i++) {
724 AliITStrackMI & track= tracks[1][nindexes[1][i]];
725 if (track.GetNumberOfClusters()<4) continue;
726 if (!fConstraint[fPass]&&track.fNormChi2[1]>7.)continue;
727 if (fConstraint[fPass]) track.fNSkipped+=1;
728 if (!fConstraint[fPass]) {
729 track.fD[0] = track.GetD(GetX(),GetY());
730 track.fNSkipped+=4./(4.+8.*TMath::Abs(track.fD[0]));
731 if (track.fN+track.fNDeadZone+track.fNSkipped>6) {
732 track.fNSkipped = 6-track.fN+track.fNDeadZone;
735 AddTrackHypothesys(new AliITStrackMI(track), esdindex);
739 if (!fConstraint[fPass]){
740 for (Int_t i=0;i<TMath::Min(3,ntracks[2]);i++) {
741 AliITStrackMI & track= tracks[2][nindexes[2][i]];
742 if (track.GetNumberOfClusters()<4) continue;
743 if (!fConstraint[fPass]&&track.fNormChi2[2]>7.)continue;
744 if (fConstraint[fPass]) track.fNSkipped+=2;
745 if (!fConstraint[fPass]){
746 track.fD[0] = track.GetD(GetX(),GetY());
747 track.fNSkipped+= 7./(7.+8.*TMath::Abs(track.fD[0]));
748 if (track.fN+track.fNDeadZone+track.fNSkipped>6) {
749 track.fNSkipped = 6-track.fN+track.fNDeadZone;
752 AddTrackHypothesys(new AliITStrackMI(track), esdindex);
758 AliITStrackerMI::AliITSlayer & AliITStrackerMI::GetLayer(Int_t layer) const
760 //--------------------------------------------------------------------
763 return fgLayers[layer];
765 AliITStrackerMI::AliITSlayer::AliITSlayer() {
766 //--------------------------------------------------------------------
767 //default AliITSlayer constructor
768 //--------------------------------------------------------------------
773 for (Int_t i=0; i<kMaxClusterPerLayer;i++) {
775 fClusterTracks[0][i]=-1;
776 fClusterTracks[1][i]=-1;
777 fClusterTracks[2][i]=-1;
778 fClusterTracks[3][i]=-1;
782 AliITStrackerMI::AliITSlayer::
783 AliITSlayer(Double_t r,Double_t p,Double_t z,Int_t nl,Int_t nd) {
784 //--------------------------------------------------------------------
785 //main AliITSlayer constructor
786 //--------------------------------------------------------------------
787 fR=r; fPhiOffset=p; fZOffset=z;
788 fNladders=nl; fNdetectors=nd;
789 fDetectors=new AliITSdetector[fNladders*fNdetectors];
794 fRoad=2*fR*TMath::Sqrt(3.14/1.);//assuming that there's only one cluster
797 AliITStrackerMI::AliITSlayer::~AliITSlayer() {
798 //--------------------------------------------------------------------
799 // AliITSlayer destructor
800 //--------------------------------------------------------------------
802 for (Int_t i=0; i<fN; i++) delete fClusters[i];
803 for (Int_t i=0; i<kMaxClusterPerLayer;i++) {
805 fClusterTracks[0][i]=-1;
806 fClusterTracks[1][i]=-1;
807 fClusterTracks[2][i]=-1;
808 fClusterTracks[3][i]=-1;
812 void AliITStrackerMI::AliITSlayer::ResetClusters() {
813 //--------------------------------------------------------------------
814 // This function removes loaded clusters
815 //--------------------------------------------------------------------
816 for (Int_t i=0; i<fN; i++) delete fClusters[i];
817 for (Int_t i=0; i<kMaxClusterPerLayer;i++){
819 fClusterTracks[0][i]=-1;
820 fClusterTracks[1][i]=-1;
821 fClusterTracks[2][i]=-1;
822 fClusterTracks[3][i]=-1;
829 void AliITStrackerMI::AliITSlayer::ResetWeights() {
830 //--------------------------------------------------------------------
831 // This function reset weights of the clusters
832 //--------------------------------------------------------------------
833 for (Int_t i=0; i<kMaxClusterPerLayer;i++) {
835 fClusterTracks[0][i]=-1;
836 fClusterTracks[1][i]=-1;
837 fClusterTracks[2][i]=-1;
838 fClusterTracks[3][i]=-1;
840 for (Int_t i=0; i<fN;i++) {
841 AliITSclusterV2 * cl = (AliITSclusterV2*)GetCluster(i);
842 if (cl&&cl->IsUsed()) cl->Use();
847 void AliITStrackerMI::AliITSlayer::ResetRoad() {
848 //--------------------------------------------------------------------
849 // This function calculates the road defined by the cluster density
850 //--------------------------------------------------------------------
852 for (Int_t i=0; i<fN; i++) {
853 if (TMath::Abs(fClusters[i]->GetZ())<fR) n++;
855 //if (n>1) fRoad=2*fR*TMath::Sqrt(3.14/n);
856 if (n>1) fRoad=2*fR*TMath::Sqrt(3.14/n);
859 Int_t AliITStrackerMI::AliITSlayer::InsertCluster(AliITSclusterV2 *c) {
860 //--------------------------------------------------------------------
861 //This function adds a cluster to this layer
862 //--------------------------------------------------------------------
863 if (fN==kMaxClusterPerLayer) {
864 ::Error("InsertCluster","Too many clusters !\n");
868 if (fN==0) {fClusters[fN++]=c; return 0;}
869 Int_t i=FindClusterIndex(c->GetZ());
870 memmove(fClusters+i+1 ,fClusters+i,(fN-i)*sizeof(AliITSclusterV2*));
871 memmove(fY+i+1 ,fY+i,(fN-i)*sizeof(Float_t));
872 memmove(fZ+i+1 ,fZ+i,(fN-i)*sizeof(Float_t));
873 fClusters[i]=c; fN++;
875 AliITSdetector &det=GetDetector(c->GetDetectorIndex());
876 Double_t y=fR*det.GetPhi() + c->GetY();
877 if (y>2.*fR*TMath::Pi()) y -= 2.*fR*TMath::Pi();
880 if (c->GetY()<det.GetYmin()) det.SetYmin(c->GetY());
881 if (c->GetY()>det.GetYmax()) det.SetYmax(c->GetY());
882 if (c->GetZ()<det.GetZmin()) det.SetZmin(c->GetZ());
883 if (c->GetZ()>det.GetZmax()) det.SetZmax(c->GetZ());
888 void AliITStrackerMI::AliITSlayer::SortClusters()
895 for (Int_t i=0;i<fN;i++){
896 if (fY[i]<fYB[0]) fYB[0]=fY[i];
897 if (fY[i]>fYB[1]) fYB[1]=fY[i];
898 fClusterIndex[i] = i;
902 fDy5 = (fYB[1]-fYB[0])/5.;
903 fDy10 = (fYB[1]-fYB[0])/10.;
904 fDy20 = (fYB[1]-fYB[0])/20.;
905 for (Int_t i=0;i<6;i++) fN5[i] =0;
906 for (Int_t i=0;i<11;i++) fN10[i]=0;
907 for (Int_t i=0;i<21;i++) fN20[i]=0;
909 for (Int_t i=0;i<6;i++) {fBy5[i][0] = fYB[0]+(i-0.75)*fDy5; fBy5[i][1] = fYB[0]+(i+0.75)*fDy5;}
910 for (Int_t i=0;i<11;i++) {fBy10[i][0] = fYB[0]+(i-0.75)*fDy10; fBy10[i][1] = fYB[0]+(i+0.75)*fDy10;}
911 for (Int_t i=0;i<21;i++) {fBy20[i][0] = fYB[0]+(i-0.75)*fDy20; fBy20[i][1] = fYB[0]+(i+0.75)*fDy20;}
914 for (Int_t i=0;i<fN;i++) for (Int_t irot=-1;irot<=1;irot++){
915 Float_t curY = fY[i]+irot*2.*TMath::Pi()*fR;
916 if (curY<fYB[0]-fDy5) continue;
917 if (curY>fYB[1]+fDy5) continue;
920 if (TMath::Abs(fYB[1]-fYB[0])<=0) continue;
921 Float_t fslice = TMath::Nint(10.*(curY-fYB[0])/(fYB[1]-fYB[0]));
922 Float_t ymiddle = fYB[0]+fslice*fDy10;
923 for (Int_t di =-1;di<=1;di++){
924 if (TMath::Abs(curY-(ymiddle+(float)di*fDy10))<0.75*fDy10){
926 Int_t slice = int(fslice+21.0001)-21+di;
927 if (slice<0) continue;
928 if (slice>10) continue;
929 if (fN10[slice]>=kMaxClusterPerLayer10) break;
930 fClusters10[slice][fN10[slice]] = fClusters[i];
931 fY10[slice][fN10[slice]] = curY;
932 fZ10[slice][fN10[slice]] = fZ[i];
933 fClusterIndex10[slice][fN10[slice]]=i;
939 fslice = TMath::Nint(5.*(curY-fYB[0])/(fYB[1]-fYB[0]));
940 ymiddle = fYB[0]+fslice*fDy5;
941 for (Int_t di =-1;di<=1;di++){
942 if (TMath::Abs(curY-(ymiddle+(float)di*fDy5))<0.75*fDy5){
944 Int_t slice = int(fslice+21.0001)-21+di;
945 if (slice<0) continue;
946 if (slice>5) continue;
947 if (fN5[slice]>=kMaxClusterPerLayer5) break;
948 fClusters5[slice][fN5[slice]] = fClusters[i];
949 fY5[slice][fN5[slice]] = curY;
950 fZ5[slice][fN5[slice]] = fZ[i];
951 fClusterIndex5[slice][fN5[slice]]=i;
957 fslice = TMath::Nint(20.*(curY-fYB[0])/(fYB[1]-fYB[0]));
958 ymiddle = fYB[0]+fslice*fDy20;
959 for (Int_t di =-1;di<=1;di++){
960 if (TMath::Abs(curY-(ymiddle+(float)di*fDy20))<0.75*fDy20){
962 Int_t slice = int(fslice+21.0001)-21+di;
963 if (slice<0) continue;
964 if (slice>20) continue;
965 if (fN20[slice]>=kMaxClusterPerLayer20) break;
966 fClusters20[slice][fN20[slice]] = fClusters[i];
967 fY20[slice][fN20[slice]] = curY;
968 fZ20[slice][fN20[slice]] = fZ[i];
969 fClusterIndex20[slice][fN20[slice]]=i;
979 Int_t AliITStrackerMI::AliITSlayer::FindClusterIndex(Float_t z) const {
980 //--------------------------------------------------------------------
981 // This function returns the index of the nearest cluster
982 //--------------------------------------------------------------------
985 if (fCurrentSlice<0) {
994 if (ncl==0) return 0;
995 Int_t b=0, e=ncl-1, m=(b+e)/2;
996 for (; b<e; m=(b+e)/2) {
997 // if (z > fClusters[m]->GetZ()) b=m+1;
998 if (z > zcl[m]) b=m+1;
1004 void AliITStrackerMI::AliITSlayer::
1005 SelectClusters(Double_t zmin,Double_t zmax,Double_t ymin, Double_t ymax) {
1006 //--------------------------------------------------------------------
1007 // This function sets the "window"
1008 //--------------------------------------------------------------------
1009 fI=FindClusterIndex(zmin); fZmax=zmax;
1010 fImax = TMath::Min(FindClusterIndex(zmax)+1,fN);
1011 Double_t circle=2*TMath::Pi()*fR;
1012 if (ymax>circle) { ymax-=circle; ymin-=circle; }
1013 fYmin=ymin; fYmax=ymax;
1019 void AliITStrackerMI::AliITSlayer::
1020 SelectClusters(Double_t zmin,Double_t zmax,Double_t ymin, Double_t ymax) {
1021 //--------------------------------------------------------------------
1022 // This function sets the "window"
1023 //--------------------------------------------------------------------
1025 Double_t circle=2*TMath::Pi()*fR;
1026 fYmin = ymin; fYmax =ymax;
1027 Float_t ymiddle = (fYmin+fYmax)*0.5;
1028 if (ymiddle<fYB[0]) {fYmin+=circle; fYmax+=circle;ymiddle+=circle;}
1030 if (ymiddle>fYB[1]) {fYmin-=circle; fYmax-=circle;ymiddle-=circle;}
1035 fClustersCs = fClusters;
1036 fClusterIndexCs = fClusterIndex;
1042 if (fCurrentSlice<0&&TMath::Abs(fYmax-fYmin)<1.49*fDy20){
1043 Int_t slice = int(0.5+(ymiddle-fYB[0])/fDy20);
1044 if (slice<0) slice=0;
1045 if (slice>20) slice=20;
1046 Bool_t isOK = (fYmin>fBy20[slice][0]&&fYmax<fBy20[slice][1]);
1048 fCurrentSlice=slice;
1049 fClustersCs = fClusters20[fCurrentSlice];
1050 fClusterIndexCs = fClusterIndex20[fCurrentSlice];
1051 fYcs = fY20[fCurrentSlice];
1052 fZcs = fZ20[fCurrentSlice];
1053 fNcs = fN20[fCurrentSlice];
1058 if (fCurrentSlice<0&&TMath::Abs(fYmax-fYmin)<1.49*fDy10){
1059 Int_t slice = int(0.5+(ymiddle-fYB[0])/fDy10);
1060 if (slice<0) slice=0;
1061 if (slice>10) slice=10;
1062 Bool_t isOK = (fYmin>fBy10[slice][0]&&fYmax<fBy10[slice][1]);
1064 fCurrentSlice=slice;
1065 fClustersCs = fClusters10[fCurrentSlice];
1066 fClusterIndexCs = fClusterIndex10[fCurrentSlice];
1067 fYcs = fY10[fCurrentSlice];
1068 fZcs = fZ10[fCurrentSlice];
1069 fNcs = fN10[fCurrentSlice];
1074 if (fCurrentSlice<0&&TMath::Abs(fYmax-fYmin)<1.49*fDy5){
1075 Int_t slice = int(0.5+(ymiddle-fYB[0])/fDy5);
1076 if (slice<0) slice=0;
1077 if (slice>5) slice=5;
1078 Bool_t isOK = (fYmin>fBy5[slice][0]&&fYmax<fBy5[slice][1]);
1080 fCurrentSlice=slice;
1081 fClustersCs = fClusters5[fCurrentSlice];
1082 fClusterIndexCs = fClusterIndex5[fCurrentSlice];
1083 fYcs = fY5[fCurrentSlice];
1084 fZcs = fZ5[fCurrentSlice];
1085 fNcs = fN5[fCurrentSlice];
1089 fI=FindClusterIndex(zmin); fZmax=zmax;
1090 fImax = TMath::Min(FindClusterIndex(zmax)+1,fNcs);
1096 const AliITSclusterV2 *AliITStrackerMI::AliITSlayer::GetNextCluster(Int_t &ci){
1097 //--------------------------------------------------------------------
1098 // This function returns clusters within the "window"
1099 //--------------------------------------------------------------------
1100 const AliITSclusterV2 *cluster=0;
1101 for (Int_t i=fI; i<fN; i++) {
1102 const AliITSclusterV2 *c=fClusters[i];
1103 if (c->GetZ() > fZmax) break;
1104 // if (c->IsUsed()) continue;
1105 const AliITSdetector &det=GetDetector(c->GetDetectorIndex());
1106 Double_t y=fR*det.GetPhi() + c->GetY();
1108 if (y>2.*fR*TMath::Pi()) y -= 2*fR*TMath::Pi();
1109 if (y>1.*fR*TMath::Pi() && fYmax<y) y -= 2*fR*TMath::Pi();
1111 if (y<fYmin) continue;
1112 if (y>fYmax) continue;
1121 const AliITSclusterV2 *AliITStrackerMI::AliITSlayer::GetNextCluster(Int_t &ci){
1122 //--------------------------------------------------------------------
1123 // This function returns clusters within the "window"
1124 //--------------------------------------------------------------------
1126 if (fCurrentSlice<0){
1127 Double_t rpi2 = 2.*fR*TMath::Pi();
1128 for (Int_t i=fI; i<fImax; i++) {
1130 if (fYmax<y) y -= rpi2;
1131 if (y<fYmin) continue;
1132 if (y>fYmax) continue;
1133 if (fClusters[i]->GetQ()==0&&fSkip==2) continue;
1136 return fClusters[i];
1140 for (Int_t i=fI; i<fImax; i++) {
1141 if (fYcs[i]<fYmin) continue;
1142 if (fYcs[i]>fYmax) continue;
1143 if (fClustersCs[i]->GetQ()==0&&fSkip==2) continue;
1144 ci=fClusterIndexCs[i];
1146 return fClustersCs[i];
1154 Int_t AliITStrackerMI::AliITSlayer::
1155 FindDetectorIndex(Double_t phi, Double_t z) const {
1156 //--------------------------------------------------------------------
1157 //This function finds the detector crossed by the track
1158 //--------------------------------------------------------------------
1159 Double_t dphi=-(phi-fPhiOffset);
1160 if (dphi < 0) dphi += 2*TMath::Pi();
1161 else if (dphi >= 2*TMath::Pi()) dphi -= 2*TMath::Pi();
1162 Int_t np=Int_t(dphi*fNladders*0.5/TMath::Pi()+0.5);
1163 if (np>=fNladders) np-=fNladders;
1164 if (np<0) np+=fNladders;
1166 Double_t dz=fZOffset-z;
1167 Int_t nz=Int_t(dz*(fNdetectors-1)*0.5/fZOffset+0.5);
1168 if (nz>=fNdetectors) return -1;
1169 if (nz<0) return -1;
1171 return np*fNdetectors + nz;
1174 Double_t AliITStrackerMI::AliITSlayer::GetThickness(Double_t y,Double_t z,Double_t &x0)
1176 //--------------------------------------------------------------------
1177 //This function returns the layer thickness at this point (units X0)
1178 //--------------------------------------------------------------------
1181 if (43<fR&&fR<45) { //SSD2
1184 if (TMath::Abs(y-0.00)>3.40) d+=dd;
1185 if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);}
1186 if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);}
1187 for (Int_t i=0; i<12; i++) {
1188 if (TMath::Abs(z-3.9*(i+0.5))<0.15) {
1189 if (TMath::Abs(y-0.00)>3.40) d+=dd;
1193 if (TMath::Abs(z+3.9*(i+0.5))<0.15) {
1194 if (TMath::Abs(y-0.00)>3.40) d+=dd;
1198 if (TMath::Abs(z-3.4-3.9*i)<0.50) {d+=(0.016-0.0034); break;}
1199 if (TMath::Abs(z+0.5+3.9*i)<0.50) {d+=(0.016-0.0034); break;}
1202 if (37<fR&&fR<41) { //SSD1
1205 if (TMath::Abs(y-0.00)>3.40) d+=dd;
1206 if (TMath::Abs(y-1.90)<0.45) {d+=(0.013-0.0034);}
1207 if (TMath::Abs(y+1.90)<0.45) {d+=(0.013-0.0034);}
1208 for (Int_t i=0; i<11; i++) {
1209 if (TMath::Abs(z-3.9*i)<0.15) {
1210 if (TMath::Abs(y-0.00)>3.40) d+=dd;
1214 if (TMath::Abs(z+3.9*i)<0.15) {
1215 if (TMath::Abs(y-0.00)>3.40) d+=dd;
1219 if (TMath::Abs(z-1.85-3.9*i)<0.50) {d+=(0.016-0.0034); break;}
1220 if (TMath::Abs(z+2.05+3.9*i)<0.50) {d+=(0.016-0.0034); break;}
1223 if (13<fR&&fR<26) { //SDD
1226 if (TMath::Abs(y-0.00)>3.30) d+=dd;
1228 if (TMath::Abs(y-1.80)<0.55) {
1230 for (Int_t j=0; j<20; j++) {
1231 if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;}
1232 if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;}
1235 if (TMath::Abs(y+1.80)<0.55) {
1237 for (Int_t j=0; j<20; j++) {
1238 if (TMath::Abs(z-0.7-1.47*j)<0.12) {d+=0.08; x0=9.; break;}
1239 if (TMath::Abs(z+0.7+1.47*j)<0.12) {d+=0.08; x0=9.; break;}
1243 for (Int_t i=0; i<4; i++) {
1244 if (TMath::Abs(z-7.3*i)<0.60) {
1246 if (TMath::Abs(y-0.00)>3.30) d+=dd;
1249 if (TMath::Abs(z+7.3*i)<0.60) {
1251 if (TMath::Abs(y-0.00)>3.30) d+=dd;
1256 if (6<fR&&fR<8) { //SPD2
1257 Double_t dd=0.0063; x0=21.5;
1259 if (TMath::Abs(y-3.08)>0.5) d+=dd;
1260 //if (TMath::Abs(y-3.08)>0.45) d+=dd;
1261 if (TMath::Abs(y-3.03)<0.10) {d+=0.014;}
1263 if (3<fR&&fR<5) { //SPD1
1264 Double_t dd=0.0063; x0=21.5;
1266 if (TMath::Abs(y+0.21)>0.6) d+=dd;
1267 //if (TMath::Abs(y+0.21)>0.45) d+=dd;
1268 if (TMath::Abs(y+0.10)<0.10) {d+=0.014;}
1274 Double_t AliITStrackerMI::GetEffectiveThickness(Double_t y,Double_t z) const
1276 //--------------------------------------------------------------------
1277 //Returns the thickness between the current layer and the vertex (units X0)
1278 //--------------------------------------------------------------------
1279 Double_t d=0.0028*3*3; //beam pipe
1282 Double_t xn=fgLayers[fI].GetR();
1283 for (Int_t i=0; i<fI; i++) {
1284 Double_t xi=fgLayers[i].GetR();
1285 d+=fgLayers[i].GetThickness(y,z,x0)*xi*xi;
1294 Double_t xi=0.5*(fgLayers[3].GetR()+fgLayers[4].GetR());
1301 Int_t AliITStrackerMI::AliITSlayer::InRoad() const {
1302 //--------------------------------------------------------------------
1303 // This function returns number of clusters within the "window"
1304 //--------------------------------------------------------------------
1306 for (Int_t i=fI; i<fN; i++) {
1307 const AliITSclusterV2 *c=fClusters[i];
1308 if (c->GetZ() > fZmax) break;
1309 if (c->IsUsed()) continue;
1310 const AliITSdetector &det=GetDetector(c->GetDetectorIndex());
1311 Double_t y=fR*det.GetPhi() + c->GetY();
1313 if (y>2.*fR*TMath::Pi()) y -= 2*fR*TMath::Pi();
1314 if (y>1.*fR*TMath::Pi() && fYmax<y) y -= 2*fR*TMath::Pi();
1316 if (y<fYmin) continue;
1317 if (y>fYmax) continue;
1324 AliITStrackerMI::RefitAt(Double_t xx,AliITStrackMI *t,const AliITStrackMI *c) {
1325 //--------------------------------------------------------------------
1326 // This function refits the track "t" at the position "x" using
1327 // the clusters from "c"
1328 //--------------------------------------------------------------------
1329 Int_t index[kMaxLayer];
1331 for (k=0; k<kMaxLayer; k++) index[k]=-1;
1332 Int_t nc=c->GetNumberOfClusters();
1333 for (k=0; k<nc; k++) {
1334 Int_t idx=c->GetClusterIndex(k),nl=(idx&0xf0000000)>>28;
1338 Int_t from, to, step;
1339 if (xx > t->GetX()) {
1340 from=0; to=kMaxLayer;
1343 from=kMaxLayer-1; to=-1;
1347 for (Int_t i=from; i != to; i += step) {
1348 AliITSlayer &layer=fgLayers[i];
1349 Double_t r=layer.GetR();
1352 Double_t hI=i-0.5*step;
1353 if (TMath::Abs(hI-1.5)<0.01 || TMath::Abs(hI-3.5)<0.01) {
1354 Double_t rs=0.5*(fgLayers[i-step].GetR() + r);
1355 Double_t d=0.0034, x0=38.6;
1356 if (TMath::Abs(hI-1.5)<0.01) {rs=9.; d=0.0097; x0=42;}
1357 if (!t->PropagateTo(rs,-step*d,x0)) {
1363 // remember old position [SR, GSI 18.02.2003]
1364 Double_t oldX=0., oldY=0., oldZ=0.;
1365 if (t->IsStartedTimeIntegral() && step==1) {
1366 t->GetGlobalXYZat(t->GetX(),oldX,oldY,oldZ);
1371 if (!t->GetGlobalXYZat(r,x,y,z)) {
1374 Double_t phi=TMath::ATan2(y,x);
1375 Int_t idet=layer.FindDetectorIndex(phi,z);
1379 const AliITSdetector &det=layer.GetDetector(idet);
1381 if (!t->Propagate(phi,det.GetR())) {
1384 t->SetDetectorIndex(idet);
1386 const AliITSclusterV2 *cl=0;
1387 Double_t maxchi2=1000.*kMaxChi2;
1391 const AliITSclusterV2 *c=(AliITSclusterV2 *)GetCluster(idx);
1392 if (idet != c->GetDetectorIndex()) {
1393 idet=c->GetDetectorIndex();
1394 const AliITSdetector &det=layer.GetDetector(idet);
1395 if (!t->Propagate(det.GetPhi(),det.GetR())) {
1398 t->SetDetectorIndex(idet);
1400 //Double_t chi2=t->GetPredictedChi2(c);
1401 Int_t layer = (idx & 0xf0000000) >> 28;;
1402 Double_t chi2=GetPredictedChi2MI(t,c,layer);
1412 if (t->GetNumberOfClusters()>2) {
1413 Double_t dz=4*TMath::Sqrt(t->GetSigmaZ2()+kSigmaZ2[i]);
1414 Double_t dy=4*TMath::Sqrt(t->GetSigmaY2()+kSigmaY2[i]);
1415 Double_t zmin=t->GetZ() - dz;
1416 Double_t zmax=t->GetZ() + dz;
1417 Double_t ymin=t->GetY() + phi*r - dy;
1418 Double_t ymax=t->GetY() + phi*r + dy;
1419 layer.SelectClusters(zmin,zmax,ymin,ymax);
1421 const AliITSclusterV2 *c=0; Int_t ci=-1;
1422 while ((c=layer.GetNextCluster(ci))!=0) {
1423 if (idet != c->GetDetectorIndex()) continue;
1424 Double_t chi2=t->GetPredictedChi2(c);
1425 if (chi2<maxchi2) { cl=c; maxchi2=chi2; idx=ci; }
1430 //if (!t->Update(cl,maxchi2,idx)) {
1431 if (!UpdateMI(t,cl,maxchi2,idx)) {
1434 t->SetSampledEdx(cl->GetQ(),t->GetNumberOfClusters()-1);
1439 Double_t d=layer.GetThickness(t->GetY(),t->GetZ(),x0);
1440 t->CorrectForMaterial(-step*d,x0);
1443 // track time update [SR, GSI 17.02.2003]
1444 if (t->IsStartedTimeIntegral() && step==1) {
1445 Double_t newX, newY, newZ;
1446 t->GetGlobalXYZat(t->GetX(),newX,newY,newZ);
1447 Double_t dL2 = (oldX-newX)*(oldX-newX) + (oldY-newY)*(oldY-newY) +
1448 (oldZ-newZ)*(oldZ-newZ);
1449 t->AddTimeStep(TMath::Sqrt(dL2));
1455 if (!t->PropagateTo(xx,0.,0.)) return kFALSE;
1460 Double_t AliITStrackerMI::GetNormalizedChi2(AliITStrackMI * track, Int_t mode)
1463 // calculate normalized chi2
1464 // return NormalizedChi2(track,0);
1467 Float_t *erry = GetErrY(fCurrentEsdTrack), *errz = GetErrZ(fCurrentEsdTrack);
1468 // track->fdEdxMismatch=0;
1469 Float_t dedxmismatch =0;
1470 Float_t *ny = GetNy(fCurrentEsdTrack), *nz = GetNz(fCurrentEsdTrack);
1472 for (Int_t i = 0;i<6;i++){
1473 if (track->fClIndex[i]>0){
1474 Float_t cerry, cerrz;
1475 if (ny[i]>0) {cerry = erry[i]; cerrz=errz[i];}
1477 { cerry= track->fSigmaY[i]; cerrz = track->fSigmaZ[i];}
1480 Float_t cchi2 = (track->fDy[i]*track->fDy[i]/cerry)+(track->fDz[i]*track->fDz[i]/cerrz);
1482 Float_t ratio = track->fNormQ[i]/track->fExpQ;
1484 cchi2+=(0.5-ratio)*10.;
1485 //track->fdEdxMismatch+=(0.5-ratio)*10.;
1486 dedxmismatch+=(0.5-ratio)*10.;
1490 AliITSclusterV2 * cl = (AliITSclusterV2*)GetCluster( track->fClIndex[i]);
1491 Double_t delta = cl->GetNy()+cl->GetNz()-ny[i]-nz[i];
1492 if (delta>1) chi2 +=0.5*TMath::Min(delta/2,2.);
1493 if (i<2) chi2+=2*cl->GetDeltaProbability();
1499 if (TMath::Abs(track->fdEdxMismatch-dedxmismatch)>0.0001){
1500 track->fdEdxMismatch = dedxmismatch;
1504 for (Int_t i = 0;i<4;i++){
1505 if (track->fClIndex[i]>0){
1506 Float_t cerry, cerrz;
1507 if (ny[i]>0) {cerry = erry[i]; cerrz=errz[i];}
1508 else { cerry= track->fSigmaY[i]; cerrz = track->fSigmaZ[i];}
1511 chi2+= (track->fDy[i]*track->fDy[i]/cerry);
1512 chi2+= (track->fDz[i]*track->fDz[i]/cerrz);
1516 for (Int_t i = 4;i<6;i++){
1517 if (track->fClIndex[i]>0){
1518 Float_t cerry, cerrz;
1519 if (ny[i]>0) {cerry = erry[i]; cerrz=errz[i];}
1520 else { cerry= track->fSigmaY[i]; cerrz = track->fSigmaZ[i];}
1523 Float_t cerryb, cerrzb;
1524 if (ny[i+6]>0) {cerryb = erry[i+6]; cerrzb=errz[i+6];}
1525 else { cerryb= track->fSigmaY[i+6]; cerrzb = track->fSigmaZ[i+6];}
1528 chi2+= TMath::Min((track->fDy[i+6]*track->fDy[i+6]/cerryb),track->fDy[i]*track->fDy[i]/cerry);
1529 chi2+= TMath::Min((track->fDz[i+6]*track->fDz[i+6]/cerrzb),track->fDz[i]*track->fDz[i]/cerrz);
1534 if (track->fESDtrack->GetTPCsignal()>85){
1535 Float_t ratio = track->fdEdx/track->fESDtrack->GetTPCsignal();
1537 chi2+=(0.5-ratio)*5.;
1540 chi2+=(ratio-2.0)*3;
1544 Double_t match = TMath::Sqrt(track->fChi22);
1545 if (track->fConstrain) match/=track->GetNumberOfClusters();
1546 if (!track->fConstrain) match/=track->GetNumberOfClusters()-2.;
1547 if (match<0) match=0;
1548 Float_t deadzonefactor = (track->fNDeadZone>0) ? 3*(1.1-track->fDeadZoneProbability):0.;
1549 Double_t normchi2 = 2*track->fNSkipped+match+deadzonefactor+(1+(2*track->fNSkipped+deadzonefactor)/track->GetNumberOfClusters())*
1550 (chi2)/TMath::Max(double(sum-track->fNSkipped),
1551 1./(1.+track->fNSkipped));
1557 Double_t AliITStrackerMI::GetMatchingChi2(AliITStrackMI * track1, AliITStrackMI * track2)
1560 // return matching chi2 between two tracks
1561 AliITStrackMI track3(*track2);
1562 track3.Propagate(track1->GetAlpha(),track1->GetX());
1564 vec(0,0)=track1->fP0-track3.fP0;
1565 vec(1,0)=track1->fP1-track3.fP1;
1566 vec(2,0)=track1->fP2-track3.fP2;
1567 vec(3,0)=track1->fP3-track3.fP3;
1568 vec(4,0)=track1->fP4-track3.fP4;
1571 cov(0,0) = track1->fC00+track3.fC00;
1572 cov(1,1) = track1->fC11+track3.fC11;
1573 cov(2,2) = track1->fC22+track3.fC22;
1574 cov(3,3) = track1->fC33+track3.fC33;
1575 cov(4,4) = track1->fC44+track3.fC44;
1577 cov(0,1)=cov(1,0) = track1->fC10+track3.fC10;
1578 cov(0,2)=cov(2,0) = track1->fC20+track3.fC20;
1579 cov(0,3)=cov(3,0) = track1->fC30+track3.fC30;
1580 cov(0,4)=cov(4,0) = track1->fC40+track3.fC40;
1582 cov(1,2)=cov(2,1) = track1->fC21+track3.fC21;
1583 cov(1,3)=cov(3,1) = track1->fC31+track3.fC31;
1584 cov(1,4)=cov(4,1) = track1->fC41+track3.fC41;
1586 cov(2,3)=cov(3,2) = track1->fC32+track3.fC32;
1587 cov(2,4)=cov(4,2) = track1->fC42+track3.fC42;
1589 cov(3,4)=cov(4,3) = track1->fC43+track3.fC43;
1592 TMatrixD vec2(cov,TMatrixD::kMult,vec);
1593 TMatrixD chi2(vec2,TMatrixD::kTransposeMult,vec);
1597 Double_t AliITStrackerMI::GetDeadZoneProbability(Double_t zpos, Double_t zerr)
1600 // return probability that given point - characterized by z position and error is in dead zone
1602 Double_t probability =0;
1603 Double_t absz = TMath::Abs(zpos);
1604 Double_t nearestz = (absz<2)? 0.:7.1;
1605 if (TMath::Abs(absz-nearestz)>0.25+3*zerr) return 0;
1606 Double_t zmin=0, zmax=0;
1608 zmin = -7.25; zmax = -6.95;
1611 zmin = 7.0; zmax =7.3;
1614 zmin = -0.75; zmax = 1.5;
1616 probability = (TMath::Erf((zpos-zmin)/zerr) - TMath::Erf((zpos-zmax)/zerr))*0.5;
1621 Double_t AliITStrackerMI::GetTruncatedChi2(AliITStrackMI * track, Float_t fac)
1624 // calculate normalized chi2
1626 Float_t *erry = GetErrY(fCurrentEsdTrack), *errz = GetErrZ(fCurrentEsdTrack);
1628 for (Int_t i = 0;i<6;i++){
1629 if (TMath::Abs(track->fDy[i])>0){
1630 chi2[i]= (track->fDy[i]/erry[i])*(track->fDy[i]/erry[i]);
1631 chi2[i]+= (track->fDz[i]/errz[i])*(track->fDz[i]/errz[i]);
1634 else{chi2[i]=10000;}
1637 TMath::Sort(6,chi2,index,kFALSE);
1638 Float_t max = float(ncl)*fac-1.;
1639 Float_t sumchi=0, sumweight=0;
1640 for (Int_t i=0;i<max+1;i++){
1641 Float_t weight = (i<max)?1.:(max+1.-i);
1642 sumchi+=weight*chi2[index[i]];
1645 Double_t normchi2 = sumchi/sumweight;
1650 Double_t AliITStrackerMI::GetInterpolatedChi2(AliITStrackMI * forwardtrack, AliITStrackMI * backtrack)
1653 // calculate normalized chi2
1654 // if (forwardtrack->fNUsed>0.3*float(forwardtrack->GetNumberOfClusters())) return 10000;
1657 for (Int_t i=0;i<6;i++){
1658 if ( (backtrack->fSigmaY[i]<0.000000001) || (forwardtrack->fSigmaY[i]<0.000000001)) continue;
1659 Double_t sy1 = forwardtrack->fSigmaY[i];
1660 Double_t sz1 = forwardtrack->fSigmaZ[i];
1661 Double_t sy2 = backtrack->fSigmaY[i];
1662 Double_t sz2 = backtrack->fSigmaZ[i];
1663 if (i<2){ sy2=1000.;sz2=1000;}
1665 Double_t dy0 = (forwardtrack->fDy[i]/(sy1*sy1) +backtrack->fDy[i]/(sy2*sy2))/(1./(sy1*sy1)+1./(sy2*sy2));
1666 Double_t dz0 = (forwardtrack->fDz[i]/(sz1*sz1) +backtrack->fDz[i]/(sz2*sz2))/(1./(sz1*sz1)+1./(sz2*sz2));
1668 Double_t nz0 = dz0*TMath::Sqrt((1./(sz1*sz1)+1./(sz2*sz2)));
1669 Double_t ny0 = dy0*TMath::Sqrt((1./(sy1*sy1)+1./(sy2*sy2)));
1671 res+= nz0*nz0+ny0*ny0;
1674 if (npoints>1) return
1675 TMath::Max(TMath::Abs(0.3*forwardtrack->Get1Pt())-0.5,0.)+
1676 //2*forwardtrack->fNUsed+
1677 res/TMath::Max(double(npoints-forwardtrack->fNSkipped),
1678 1./(1.+forwardtrack->fNSkipped));
1686 Float_t *AliITStrackerMI::GetWeight(Int_t index) {
1687 //--------------------------------------------------------------------
1688 // Return pointer to a given cluster
1689 //--------------------------------------------------------------------
1690 Int_t l=(index & 0xf0000000) >> 28;
1691 Int_t c=(index & 0x0fffffff) >> 00;
1692 return fgLayers[l].GetWeight(c);
1695 void AliITStrackerMI::RegisterClusterTracks(AliITStrackMI* track,Int_t id)
1697 //---------------------------------------------
1698 // register track to the list
1699 for (Int_t icluster=0;icluster<track->GetNumberOfClusters();icluster++){
1700 Int_t index = track->GetClusterIndex(icluster);
1701 Int_t l=(index & 0xf0000000) >> 28;
1702 Int_t c=(index & 0x0fffffff) >> 00;
1703 if (c>fgLayers[l].fN) continue;
1704 for (Int_t itrack=0;itrack<4;itrack++){
1705 if (fgLayers[l].fClusterTracks[itrack][c]<0){
1706 fgLayers[l].fClusterTracks[itrack][c]=id;
1712 void AliITStrackerMI::UnRegisterClusterTracks(AliITStrackMI* track, Int_t id)
1714 //---------------------------------------------
1715 // unregister track from the list
1716 for (Int_t icluster=0;icluster<track->GetNumberOfClusters();icluster++){
1717 Int_t index = track->GetClusterIndex(icluster);
1718 Int_t l=(index & 0xf0000000) >> 28;
1719 Int_t c=(index & 0x0fffffff) >> 00;
1720 if (c>fgLayers[l].fN) continue;
1721 for (Int_t itrack=0;itrack<4;itrack++){
1722 if (fgLayers[l].fClusterTracks[itrack][c]==id){
1723 fgLayers[l].fClusterTracks[itrack][c]=-1;
1728 Float_t AliITStrackerMI::GetNumberOfSharedClusters(AliITStrackMI* track,Int_t id, Int_t list[6], AliITSclusterV2 *clist[6])
1730 //-------------------------------------------------------------
1731 //get number of shared clusters
1732 //-------------------------------------------------------------
1734 for (Int_t i=0;i<6;i++) { list[i]=-1, clist[i]=0;}
1735 // mean number of clusters
1736 Float_t *ny = GetNy(id), *nz = GetNz(id);
1739 for (Int_t icluster=0;icluster<track->GetNumberOfClusters();icluster++){
1740 Int_t index = track->GetClusterIndex(icluster);
1741 Int_t l=(index & 0xf0000000) >> 28;
1742 Int_t c=(index & 0x0fffffff) >> 00;
1743 if (c>fgLayers[l].fN) continue;
1745 printf("problem\n");
1747 AliITSclusterV2 *cl = (AliITSclusterV2*)GetCluster(index);
1751 if (l>3&&cl->GetNy()+cl->GetNz()>6) continue;
1752 if (l>2&&track->fNormQ[l]/track->fExpQ>3.5) continue;
1754 deltan = (cl->GetNy()+cl->GetNz()-ny[l]-nz[l]);
1757 deltan = (cl->GetNz()-nz[l]);
1759 if (deltan>2.0) continue; // extended - highly probable shared cluster
1760 weight = 2./TMath::Max(3.+deltan,2.);
1762 for (Int_t itrack=0;itrack<4;itrack++){
1763 if (fgLayers[l].fClusterTracks[itrack][c]>=0 && fgLayers[l].fClusterTracks[itrack][c]!=id){
1765 clist[l] = (AliITSclusterV2*)GetCluster(index);
1771 track->fNUsed=shared;
1775 Int_t AliITStrackerMI::GetOverlapTrack(AliITStrackMI *track, Int_t trackID, Int_t &shared, Int_t clusterlist[6],Int_t overlist[6])
1778 // find first shared track
1780 // mean number of clusters
1781 Float_t *ny = GetNy(trackID), *nz = GetNz(trackID);
1783 for (Int_t i=0;i<6;i++) overlist[i]=-1;
1784 Int_t sharedtrack=100000;
1785 Int_t tracks[24],trackindex=0;
1786 for (Int_t i=0;i<24;i++) {tracks[i]=-1;}
1788 for (Int_t icluster=0;icluster<6;icluster++){
1789 if (clusterlist[icluster]<0) continue;
1790 Int_t index = clusterlist[icluster];
1791 Int_t l=(index & 0xf0000000) >> 28;
1792 Int_t c=(index & 0x0fffffff) >> 00;
1794 printf("problem\n");
1796 if (c>fgLayers[l].fN) continue;
1797 //if (l>3) continue;
1798 AliITSclusterV2 *cl = (AliITSclusterV2*)GetCluster(index);
1801 if (l>3&&cl->GetNy()+cl->GetNz()>6) continue;
1802 if (l>2&&track->fNormQ[l]/track->fExpQ>3.5) continue;
1804 deltan = (cl->GetNy()+cl->GetNz()-ny[l]-nz[l]);
1807 deltan = (cl->GetNz()-nz[l]);
1809 if (deltan>2.0) continue; // extended - highly probable shared cluster
1811 for (Int_t itrack=3;itrack>=0;itrack--){
1812 if (fgLayers[l].fClusterTracks[itrack][c]<0) continue;
1813 if (fgLayers[l].fClusterTracks[itrack][c]!=trackID){
1814 tracks[trackindex] = fgLayers[l].fClusterTracks[itrack][c];
1819 if (trackindex==0) return -1;
1821 sharedtrack = tracks[0];
1823 if (trackindex==2) sharedtrack =TMath::Min(tracks[0],tracks[1]);
1826 Int_t track[24], cluster[24];
1827 for (Int_t i=0;i<trackindex;i++){ track[i]=-1; cluster[i]=0;}
1830 for (Int_t i=0;i<trackindex;i++){
1831 if (tracks[i]<0) continue;
1832 track[index] = tracks[i];
1834 for (Int_t j=i+1;j<trackindex;j++){
1835 if (tracks[j]<0) continue;
1836 if (tracks[j]==tracks[i]){
1844 for (Int_t i=0;i<index;i++){
1845 if (cluster[index]>max) {
1846 sharedtrack=track[index];
1853 if (sharedtrack>=100000) return -1;
1855 // make list of overlaps
1857 for (Int_t icluster=0;icluster<6;icluster++){
1858 if (clusterlist[icluster]<0) continue;
1859 Int_t index = clusterlist[icluster];
1860 Int_t l=(index & 0xf0000000) >> 28;
1861 Int_t c=(index & 0x0fffffff) >> 00;
1862 if (c>fgLayers[l].fN) continue;
1863 AliITSclusterV2 *cl = (AliITSclusterV2*)GetCluster(index);
1865 if (cl->GetNy()>2) continue;
1866 if (cl->GetNz()>2) continue;
1869 if (cl->GetNy()>3) continue;
1870 if (cl->GetNz()>3) continue;
1873 for (Int_t itrack=3;itrack>=0;itrack--){
1874 if (fgLayers[l].fClusterTracks[itrack][c]<0) continue;
1875 if (fgLayers[l].fClusterTracks[itrack][c]==sharedtrack){
1885 AliITStrackMI * AliITStrackerMI::GetBest2Tracks(Int_t trackID1, Int_t trackID2, Float_t th0, Float_t th1){
1887 // try to find track hypothesys without conflicts
1888 // with minimal chi2;
1889 TClonesArray *arr1 = (TClonesArray*)fTrackHypothesys.At(trackID1);
1890 Int_t entries1 = arr1->GetEntriesFast();
1891 TClonesArray *arr2 = (TClonesArray*)fTrackHypothesys.At(trackID2);
1892 if (!arr2) return (AliITStrackMI*) arr1->UncheckedAt(0);
1893 Int_t entries2 = arr2->GetEntriesFast();
1894 if (entries2<=0) return (AliITStrackMI*) arr1->UncheckedAt(0);
1896 AliITStrackMI * track10=(AliITStrackMI*) arr1->UncheckedAt(0);
1897 AliITStrackMI * track20=(AliITStrackMI*) arr2->UncheckedAt(0);
1898 if (TMath::Abs(1./track10->Get1Pt())>0.5+TMath::Abs(1/track20->Get1Pt())) return track10;
1900 for (Int_t itrack=0;itrack<entries1;itrack++){
1901 AliITStrackMI * track=(AliITStrackMI*) arr1->UncheckedAt(itrack);
1902 UnRegisterClusterTracks(track,trackID1);
1905 for (Int_t itrack=0;itrack<entries2;itrack++){
1906 AliITStrackMI * track=(AliITStrackMI*) arr2->UncheckedAt(itrack);
1907 UnRegisterClusterTracks(track,trackID2);
1911 Float_t maxconflicts=6;
1912 Double_t maxchi2 =1000.;
1914 // get weight of hypothesys - using best hypothesy
1917 Int_t list1[6],list2[6];
1918 AliITSclusterV2 *clist1[6], *clist2[6] ;
1919 RegisterClusterTracks(track10,trackID1);
1920 RegisterClusterTracks(track20,trackID2);
1921 Float_t conflict1 = GetNumberOfSharedClusters(track10,trackID1,list1,clist1);
1922 Float_t conflict2 = GetNumberOfSharedClusters(track20,trackID2,list2,clist2);
1923 UnRegisterClusterTracks(track10,trackID1);
1924 UnRegisterClusterTracks(track20,trackID2);
1927 Float_t chi21 =0,chi22=0,ncl1=0,ncl2=0;
1928 Float_t nerry[6],nerrz[6];
1929 Float_t *erry1=GetErrY(trackID1),*errz1 = GetErrZ(trackID1);
1930 Float_t *erry2=GetErrY(trackID2),*errz2 = GetErrZ(trackID2);
1931 for (Int_t i=0;i<6;i++){
1932 if ( (erry1[i]>0) && (erry2[i]>0)) {
1933 nerry[i] = TMath::Min(erry1[i],erry2[i]);
1934 nerrz[i] = TMath::Min(errz1[i],errz2[i]);
1936 nerry[i] = TMath::Max(erry1[i],erry2[i]);
1937 nerrz[i] = TMath::Max(errz1[i],errz2[i]);
1939 if (TMath::Abs(track10->fDy[i])>0.000000000000001){
1940 chi21 += track10->fDy[i]*track10->fDy[i]/(nerry[i]*nerry[i]);
1941 chi21 += track10->fDz[i]*track10->fDz[i]/(nerrz[i]*nerrz[i]);
1944 if (TMath::Abs(track20->fDy[i])>0.000000000000001){
1945 chi22 += track20->fDy[i]*track20->fDy[i]/(nerry[i]*nerry[i]);
1946 chi22 += track20->fDz[i]*track20->fDz[i]/(nerrz[i]*nerrz[i]);
1954 Float_t d1 = TMath::Sqrt(track10->fD[0]*track10->fD[0]+track10->fD[1]*track10->fD[1])+0.1;
1955 Float_t d2 = TMath::Sqrt(track20->fD[0]*track20->fD[0]+track20->fD[1]*track20->fD[1])+0.1;
1956 Float_t s1 = TMath::Sqrt(track10->GetSigmaY2()*track10->GetSigmaZ2());
1957 Float_t s2 = TMath::Sqrt(track20->GetSigmaY2()*track20->GetSigmaZ2());
1959 w1 = (d2/(d1+d2)+ 2*s2/(s1+s2)+
1960 +s2/(s1+s2)*0.5*(chi22+2.)/(chi21+chi22+4.)
1961 +1.*TMath::Abs(1./track10->Get1Pt())/(TMath::Abs(1./track10->Get1Pt())+TMath::Abs(1./track20->Get1Pt()))
1963 w2 = (d1/(d1+d2)+ 2*s1/(s1+s2)+
1964 s1/(s1+s2)*0.5*(chi21+2.)/(chi21+chi22+4.)
1965 +1.*TMath::Abs(1./track20->Get1Pt())/(TMath::Abs(1./track10->Get1Pt())+TMath::Abs(1./track20->Get1Pt()))
1968 Double_t sumw = w1+w2;
1972 w1 = (d2+0.5)/(d1+d2+1.);
1973 w2 = (d1+0.5)/(d1+d2+1.);
1975 // Float_t maxmax = w1*track10->fChi2MIP[0]+w2*track20->fChi2MIP[0]+w1*conflict1+w2*conflict2+1.;
1976 //Float_t maxconflicts0 = w1*conflict1+w2*conflict2;
1978 // get pair of "best" hypothesys
1980 Float_t * ny1 = GetNy(trackID1), * nz1 = GetNz(trackID1);
1981 Float_t * ny2 = GetNy(trackID2), * nz2 = GetNz(trackID2);
1983 for (Int_t itrack1=0;itrack1<entries1;itrack1++){
1984 AliITStrackMI * track1=(AliITStrackMI*) arr1->UncheckedAt(itrack1);
1985 //if (track1->fFakeRatio>0) continue;
1986 RegisterClusterTracks(track1,trackID1);
1987 for (Int_t itrack2=0;itrack2<entries2;itrack2++){
1988 AliITStrackMI * track2=(AliITStrackMI*) arr2->UncheckedAt(itrack2);
1990 // Float_t current = w1*track1->fChi2MIP[0]+w2*track2->fChi2MIP[0];
1991 //if (track2->fFakeRatio>0) continue;
1993 RegisterClusterTracks(track2,trackID2);
1994 Int_t list1[6],list2[6];
1995 AliITSclusterV2 *clist1[6], *clist2[6] ;
1996 Float_t cconflict1 = GetNumberOfSharedClusters(track1,trackID1,list1,clist1);
1997 Float_t cconflict2 = GetNumberOfSharedClusters(track2,trackID2,list2,clist2);
1998 UnRegisterClusterTracks(track2,trackID2);
2000 if (track1->fConstrain) nskipped+=w1*track1->fNSkipped;
2001 if (track2->fConstrain) nskipped+=w2*track2->fNSkipped;
2002 if (nskipped>0.5) continue;
2004 //if ( w1*conflict1+w2*conflict2>maxconflicts0) continue;
2005 if (conflict1+1<cconflict1) continue;
2006 if (conflict2+1<cconflict2) continue;
2010 for (Int_t i=0;i<6;i++){
2012 Float_t c1 =0.; // conflict coeficients
2014 if (clist1[i]&&clist2[i]){
2017 deltan = (clist1[i]->GetNy()+clist1[i]->GetNz()-TMath::Max(ny1[i],ny2[i])-TMath::Max(nz1[i],nz2[i]));
2020 deltan = (clist1[i]->GetNz()-TMath::Max(nz1[i],nz2[i]));
2022 c1 = 2./TMath::Max(3.+deltan,2.);
2023 c2 = 2./TMath::Max(3.+deltan,2.);
2029 deltan = (clist1[i]->GetNy()+clist1[i]->GetNz()-ny1[i]-nz1[i]);
2032 deltan = (clist1[i]->GetNz()-nz1[i]);
2034 c1 = 2./TMath::Max(3.+deltan,2.);
2041 deltan = (clist2[i]->GetNy()+clist2[i]->GetNz()-ny2[i]-nz2[i]);
2044 deltan = (clist2[i]->GetNz()-nz2[i]);
2046 c2 = 2./TMath::Max(3.+deltan,2.);
2051 Double_t chi21=0,chi22=0;
2052 if (TMath::Abs(track1->fDy[i])>0.) {
2053 chi21 = (track1->fDy[i]/track1->fSigmaY[i])*(track1->fDy[i]/track1->fSigmaY[i])+
2054 (track1->fDz[i]/track1->fSigmaZ[i])*(track1->fDz[i]/track1->fSigmaZ[i]);
2055 //chi21 = (track1->fDy[i]*track1->fDy[i])/(nerry[i]*nerry[i])+
2056 // (track1->fDz[i]*track1->fDz[i])/(nerrz[i]*nerrz[i]);
2058 if (TMath::Abs(track1->fSigmaY[i]>0.)) c1=1;
2061 if (TMath::Abs(track2->fDy[i])>0.) {
2062 chi22 = (track2->fDy[i]/track2->fSigmaY[i])*(track2->fDy[i]/track2->fSigmaY[i])+
2063 (track2->fDz[i]/track2->fSigmaZ[i])*(track2->fDz[i]/track2->fSigmaZ[i]);
2064 //chi22 = (track2->fDy[i]*track2->fDy[i])/(nerry[i]*nerry[i])+
2065 // (track2->fDz[i]*track2->fDz[i])/(nerrz[i]*nerrz[i]);
2068 if (TMath::Abs(track2->fSigmaY[i]>0.)) c2=1;
2070 sumchi2+=w1*(1.+c1)*(1+c1)*(chi21+c1)+w2*(1.+c2)*(1+c2)*(chi22+c2);
2071 if (chi21>0) sum+=w1;
2072 if (chi22>0) sum+=w2;
2075 Double_t norm = sum-w1*track1->fNSkipped-w2*track2->fNSkipped;
2076 if (norm<0) norm =1/(w1*track1->fNSkipped+w2*track2->fNSkipped);
2077 Double_t normchi2 = 2*conflict+sumchi2/sum;
2078 if ( normchi2 <maxchi2 ){
2081 maxconflicts = conflict;
2085 UnRegisterClusterTracks(track1,trackID1);
2088 // if (maxconflicts<4 && maxchi2<th0){
2089 if (maxchi2<th0*2.){
2090 Float_t orig = track10->fFakeRatio*track10->GetNumberOfClusters();
2091 AliITStrackMI* track1=(AliITStrackMI*) arr1->UncheckedAt(index1);
2092 track1->fChi2MIP[5] = maxconflicts;
2093 track1->fChi2MIP[6] = maxchi2;
2094 track1->fChi2MIP[7] = 0.01+orig-(track1->fFakeRatio*track1->GetNumberOfClusters());
2095 // track1->UpdateESDtrack(AliESDtrack::kITSin);
2096 track1->fChi2MIP[8] = index1;
2097 fBestTrackIndex[trackID1] =index1;
2098 UpdateESDtrack(track1, AliESDtrack::kITSin);
2100 else if (track10->fChi2MIP[0]<th1){
2101 track10->fChi2MIP[5] = maxconflicts;
2102 track10->fChi2MIP[6] = maxchi2;
2103 // track10->UpdateESDtrack(AliESDtrack::kITSin);
2104 UpdateESDtrack(track10,AliESDtrack::kITSin);
2107 for (Int_t itrack=0;itrack<entries1;itrack++){
2108 AliITStrackMI * track=(AliITStrackMI*) arr1->UncheckedAt(itrack);
2109 UnRegisterClusterTracks(track,trackID1);
2112 for (Int_t itrack=0;itrack<entries2;itrack++){
2113 AliITStrackMI * track=(AliITStrackMI*) arr2->UncheckedAt(itrack);
2114 UnRegisterClusterTracks(track,trackID2);
2117 if (track10->fConstrain&&track10->fChi2MIP[0]<kMaxChi2PerCluster[0]&&track10->fChi2MIP[1]<kMaxChi2PerCluster[1]
2118 &&track10->fChi2MIP[2]<kMaxChi2PerCluster[2]&&track10->fChi2MIP[3]<kMaxChi2PerCluster[3]){
2119 // if (track10->fChi2MIP[0]<kMaxChi2PerCluster[0]&&track10->fChi2MIP[1]<kMaxChi2PerCluster[1]
2120 // &&track10->fChi2MIP[2]<kMaxChi2PerCluster[2]&&track10->fChi2MIP[3]<kMaxChi2PerCluster[3]){
2121 RegisterClusterTracks(track10,trackID1);
2123 if (track20->fConstrain&&track20->fChi2MIP[0]<kMaxChi2PerCluster[0]&&track20->fChi2MIP[1]<kMaxChi2PerCluster[1]
2124 &&track20->fChi2MIP[2]<kMaxChi2PerCluster[2]&&track20->fChi2MIP[3]<kMaxChi2PerCluster[3]){
2125 //if (track20->fChi2MIP[0]<kMaxChi2PerCluster[0]&&track20->fChi2MIP[1]<kMaxChi2PerCluster[1]
2126 // &&track20->fChi2MIP[2]<kMaxChi2PerCluster[2]&&track20->fChi2MIP[3]<kMaxChi2PerCluster[3]){
2127 RegisterClusterTracks(track20,trackID2);
2133 void AliITStrackerMI::UseClusters(const AliKalmanTrack *t, Int_t from) const {
2134 //--------------------------------------------------------------------
2135 // This function marks clusters assigned to the track
2136 //--------------------------------------------------------------------
2137 AliTracker::UseClusters(t,from);
2139 AliITSclusterV2 *c=(AliITSclusterV2 *)GetCluster(t->GetClusterIndex(0));
2140 //if (c->GetQ()>2) c->Use();
2141 if (c->GetSigmaZ2()>0.1) c->Use();
2142 c=(AliITSclusterV2 *)GetCluster(t->GetClusterIndex(1));
2143 //if (c->GetQ()>2) c->Use();
2144 if (c->GetSigmaZ2()>0.1) c->Use();
2149 void AliITStrackerMI::AddTrackHypothesys(AliITStrackMI * track, Int_t esdindex)
2151 //------------------------------------------------------------------
2152 // add track to the list of hypothesys
2153 //------------------------------------------------------------------
2155 if (esdindex>=fTrackHypothesys.GetEntriesFast()) fTrackHypothesys.Expand(esdindex*2+10);
2157 TObjArray * array = (TObjArray*) fTrackHypothesys.At(esdindex);
2159 array = new TObjArray(10);
2160 fTrackHypothesys.AddAt(array,esdindex);
2162 array->AddLast(track);
2165 void AliITStrackerMI::SortTrackHypothesys(Int_t esdindex, Int_t maxcut, Int_t mode)
2167 //-------------------------------------------------------------------
2168 // compress array of track hypothesys
2169 // keep only maxsize best hypothesys
2170 //-------------------------------------------------------------------
2171 if (esdindex>fTrackHypothesys.GetEntriesFast()) return;
2172 if (! (fTrackHypothesys.At(esdindex)) ) return;
2173 TObjArray * array = (TObjArray*) fTrackHypothesys.At(esdindex);
2174 Int_t entries = array->GetEntriesFast();
2176 //- find preliminary besttrack as a reference
2177 Float_t minchi2=10000;
2179 AliITStrackMI * besttrack=0;
2180 for (Int_t itrack=0;itrack<array->GetEntriesFast();itrack++){
2181 AliITStrackMI * track = (AliITStrackMI*)array->At(itrack);
2182 if (!track) continue;
2183 Float_t chi2 = NormalizedChi2(track,0);
2185 Int_t tpcLabel=track->fESDtrack->GetTPCLabel();
2186 track->SetLabel(tpcLabel);
2188 track->fFakeRatio=1.;
2189 CookLabel(track,0.); //For comparison only
2191 //if (chi2<kMaxChi2PerCluster[0]&&track->fFakeRatio==0){
2192 if (chi2<kMaxChi2PerCluster[0]){
2193 if (track->GetNumberOfClusters()<maxn) continue;
2194 maxn = track->GetNumberOfClusters();
2201 delete array->RemoveAt(itrack);
2204 if (!besttrack) return;
2207 //take errors of best track as a reference
2208 Float_t *erry = GetErrY(esdindex), *errz = GetErrZ(esdindex);
2209 Float_t *ny = GetNy(esdindex), *nz = GetNz(esdindex);
2210 for (Int_t i=0;i<6;i++) {
2211 if (besttrack->fClIndex[i]>0){
2212 erry[i] = besttrack->fSigmaY[i]; erry[i+6] = besttrack->fSigmaY[i+6];
2213 errz[i] = besttrack->fSigmaZ[i]; errz[i+6] = besttrack->fSigmaZ[i+6];
2214 ny[i] = besttrack->fNy[i];
2215 nz[i] = besttrack->fNz[i];
2219 // calculate normalized chi2
2221 Float_t * chi2 = new Float_t[entries];
2222 Int_t * index = new Int_t[entries];
2223 for (Int_t i=0;i<entries;i++) chi2[i] =10000;
2224 for (Int_t itrack=0;itrack<entries;itrack++){
2225 AliITStrackMI * track = (AliITStrackMI*)array->At(itrack);
2227 track->fChi2MIP[0] = GetNormalizedChi2(track, mode);
2228 if (track->fChi2MIP[0]<kMaxChi2PerCluster[0])
2229 chi2[itrack] = track->fChi2MIP[0];
2231 delete array->RemoveAt(itrack);
2235 TMath::Sort(entries,chi2,index,kFALSE);
2236 besttrack = (AliITStrackMI*)array->At(index[0]);
2237 if (besttrack&&besttrack->fChi2MIP[0]<kMaxChi2PerCluster[0]){
2238 for (Int_t i=0;i<6;i++){
2239 if (besttrack->fClIndex[i]>0){
2240 erry[i] = besttrack->fSigmaY[i]; erry[i+6] = besttrack->fSigmaY[i+6];
2241 errz[i] = besttrack->fSigmaZ[i]; erry[i+6] = besttrack->fSigmaY[i+6];
2242 ny[i] = besttrack->fNy[i];
2243 nz[i] = besttrack->fNz[i];
2248 // calculate one more time with updated normalized errors
2249 for (Int_t i=0;i<entries;i++) chi2[i] =10000;
2250 for (Int_t itrack=0;itrack<entries;itrack++){
2251 AliITStrackMI * track = (AliITStrackMI*)array->At(itrack);
2253 track->fChi2MIP[0] = GetNormalizedChi2(track,mode);
2254 if (track->fChi2MIP[0]<kMaxChi2PerCluster[0])
2255 chi2[itrack] = track->fChi2MIP[0]-0*(track->GetNumberOfClusters()+track->fNDeadZone);
2257 delete array->RemoveAt(itrack);
2260 entries = array->GetEntriesFast();
2263 TObjArray * newarray = new TObjArray();
2264 TMath::Sort(entries,chi2,index,kFALSE);
2265 besttrack = (AliITStrackMI*)array->At(index[0]);
2268 for (Int_t i=0;i<6;i++){
2269 if (besttrack->fNz[i]>0&&besttrack->fNy[i]>0){
2270 erry[i] = besttrack->fSigmaY[i]; erry[i+6] = besttrack->fSigmaY[i+6];
2271 errz[i] = besttrack->fSigmaZ[i]; errz[i+6] = besttrack->fSigmaZ[i+6];
2272 ny[i] = besttrack->fNy[i];
2273 nz[i] = besttrack->fNz[i];
2276 besttrack->fChi2MIP[0] = GetNormalizedChi2(besttrack,mode);
2277 Float_t minchi2 = TMath::Min(besttrack->fChi2MIP[0]+5.+besttrack->fNUsed, double(kMaxChi2PerCluster[0]));
2278 Float_t minn = besttrack->GetNumberOfClusters()-3;
2280 for (Int_t i=0;i<entries;i++){
2281 AliITStrackMI * track = (AliITStrackMI*)array->At(index[i]);
2282 if (!track) continue;
2283 if (accepted>maxcut) break;
2284 track->fChi2MIP[0] = GetNormalizedChi2(track,mode);
2285 if (track->GetNumberOfClusters()<6 && (track->fChi2MIP[0]+track->fNUsed>minchi2)){
2286 delete array->RemoveAt(index[i]);
2289 if (track->fChi2MIP[0]+track->fNUsed<minchi2 && track->GetNumberOfClusters()>=minn){
2292 newarray->AddLast(array->RemoveAt(index[i]));
2293 for (Int_t i=0;i<6;i++){
2295 erry[i] = track->fSigmaY[i]; erry[i+6] = track->fSigmaY[i+6];
2296 errz[i] = track->fSigmaZ[i]; errz[i] = track->fSigmaZ[i+6];
2297 ny[i] = track->fNy[i];
2298 nz[i] = track->fNz[i];
2303 delete array->RemoveAt(index[i]);
2307 delete fTrackHypothesys.RemoveAt(esdindex);
2308 fTrackHypothesys.AddAt(newarray,esdindex);
2312 delete fTrackHypothesys.RemoveAt(esdindex);
2321 AliITStrackMI * AliITStrackerMI::GetBestHypothesys(Int_t esdindex, AliITStrackMI * original, Int_t checkmax)
2323 //-------------------------------------------------------------
2324 // try to find best hypothesy
2325 // currently - minimal chi2 of track+backpropagated track+matching to the tpc track
2326 //-------------------------------------------------------------
2327 if (fTrackHypothesys.GetEntriesFast()<=esdindex) return 0;
2328 TObjArray * array = (TObjArray*) fTrackHypothesys.At(esdindex);
2329 if (!array) return 0;
2330 Int_t entries = array->GetEntriesFast();
2331 if (!entries) return 0;
2332 Float_t minchi2 = 100000;
2333 AliITStrackMI * besttrack=0;
2335 AliITStrackMI * backtrack = new AliITStrackMI(*original);
2336 AliITStrackMI * forwardtrack = new AliITStrackMI(*original);
2338 for (Int_t i=0;i<entries;i++){
2339 AliITStrackMI * track = (AliITStrackMI*)array->At(i);
2340 if (!track) continue;
2341 track->fChi2MIP[1] = 1000000;
2342 track->fChi2MIP[2] = 1000000;
2343 track->fChi2MIP[3] = 1000000;
2346 backtrack = new(backtrack) AliITStrackMI(*track);
2347 backtrack->ResetCovariance();
2348 backtrack->ResetCovariance();
2349 backtrack->ResetClusters();
2350 Double_t x = original->GetX();
2351 if (!RefitAt(x,backtrack,track)) continue;
2352 track->fChi2MIP[1] = NormalizedChi2(backtrack,0);
2353 //for (Int_t i=2;i<6;i++){track->fDy[i]+=backtrack->fDy[i]; track->fDz[i]+=backtrack->fDz[i];}
2354 if (track->fChi2MIP[1]>kMaxChi2PerCluster[1]*6.) continue;
2355 track->fChi22 = GetMatchingChi2(backtrack,original);
2357 if ((track->fConstrain) && track->fChi22>90.) continue;
2358 if ((!track->fConstrain) && track->fChi22>30.) continue;
2359 if ( track->fChi22/track->GetNumberOfClusters()>11.) continue;
2362 if (!(track->fConstrain)&&track->fChi2MIP[1]>kMaxChi2PerCluster[1]) continue;
2365 for (Int_t i=0;i<6;i++){
2366 if (track->fClIndex[i]>0){
2367 Double_t dy1 = (track->fDy[i]/track->fSigmaY[i]);
2368 Double_t dz1 = (track->fDz[i]/track->fSigmaZ[i]);
2369 Double_t dy2 = (backtrack->fDy[i]/backtrack->fSigmaY[i]);
2370 Double_t dz2 = (backtrack->fDz[i]/backtrack->fSigmaZ[i]);
2371 if (TMath::Min(dy1*dy1+dz1*dz1,dy2*dy2+dz2*dz2)> kMaxChi2sR[i]) isOK =kFALSE;
2372 track->fDy[i+6] = backtrack->fDy[i];
2373 track->fDz[i+6] = backtrack->fDz[i];
2374 track->fSigmaY[i+6] = backtrack->fSigmaY[i];
2375 track->fSigmaZ[i+6] = backtrack->fSigmaZ[i];
2379 if (track->fClIndex[i-1]>0){
2380 Double_t dy2 = (backtrack->fDy[i-1]/backtrack->fSigmaY[i-1]);
2381 Double_t dz2 = (backtrack->fDz[i-1]/backtrack->fSigmaZ[i-1]);
2382 if (dy2*dy2+dz2*dz2> kMaxChi2sR[i]) isOK =kFALSE;
2391 //forward track - without constraint
2392 forwardtrack = new(forwardtrack) AliITStrackMI(*original);
2393 forwardtrack->ResetClusters();
2395 if (!RefitAt(x,forwardtrack,track)) continue;
2396 track->fChi2MIP[2] = NormalizedChi2(forwardtrack,0);
2397 if (track->fChi2MIP[2]>kMaxChi2PerCluster[2]*6.0) continue;
2398 if (!(track->fConstrain)&&track->fChi2MIP[2]>kMaxChi2PerCluster[2]) continue;
2400 track->fD[0] = forwardtrack->GetD(GetX(),GetY());
2401 track->fD[1] = forwardtrack->GetZat(GetX())-GetZ();
2402 forwardtrack->fD[0] = track->fD[0];
2403 forwardtrack->fD[1] = track->fD[1];
2406 AliITSclusterV2* clist[6];
2407 track->fChi2MIP[4] = GetNumberOfSharedClusters(track,esdindex,list,clist);
2408 if ( (!track->fConstrain) && track->fChi2MIP[4]>1.0) continue;
2411 track->fChi2MIP[3] = GetInterpolatedChi2(forwardtrack,backtrack);
2412 if ( (track->fChi2MIP[3]>6.*kMaxChi2PerCluster[3])) continue;
2413 if ( (!track->fConstrain) && (track->fChi2MIP[3]>2*kMaxChi2PerCluster[3])) {
2414 track->fChi2MIP[3]=1000;
2417 Double_t chi2 = track->fChi2MIP[0]+track->fNUsed;
2419 for (Int_t ichi=0;ichi<5;ichi++){
2420 forwardtrack->fChi2MIP[ichi] = track->fChi2MIP[ichi];
2422 if (chi2 < minchi2){
2423 //besttrack = new AliITStrackMI(*forwardtrack);
2425 besttrack->SetLabel(track->GetLabel());
2426 besttrack->fFakeRatio = track->fFakeRatio;
2428 original->fD[0] = forwardtrack->GetD(GetX(),GetY());
2429 original->fD[1] = forwardtrack->GetZat(GetX())-GetZ();
2433 delete forwardtrack;
2435 for (Int_t i=0;i<entries;i++){
2436 AliITStrackMI * track = (AliITStrackMI*)array->At(i);
2437 if (!track) continue;
2438 if (accepted>checkmax || track->fChi2MIP[3]>kMaxChi2PerCluster[3]*6. ||
2439 (track->GetNumberOfClusters()<besttrack->GetNumberOfClusters()-1.)||
2440 track->fChi2MIP[0]>besttrack->fChi2MIP[0]+2.*besttrack->fNUsed+3.){
2441 delete array->RemoveAt(i);
2450 SortTrackHypothesys(esdindex,checkmax,1);
2451 array = (TObjArray*) fTrackHypothesys.At(esdindex);
2452 besttrack = (AliITStrackMI*)array->At(0);
2453 if (!besttrack) return 0;
2454 besttrack->fChi2MIP[8]=0;
2455 fBestTrackIndex[esdindex]=0;
2456 entries = array->GetEntriesFast();
2457 AliITStrackMI *longtrack =0;
2459 Float_t minn=besttrack->GetNumberOfClusters()+besttrack->fNDeadZone;
2460 for (Int_t itrack=entries-1;itrack>0;itrack--){
2461 AliITStrackMI * track = (AliITStrackMI*)array->At(itrack);
2462 if (!track->fConstrain) continue;
2463 if (track->GetNumberOfClusters()+track->fNDeadZone<minn) continue;
2464 if (track->fChi2MIP[0]-besttrack->fChi2MIP[0]>0.0) continue;
2465 if (track->fChi2MIP[0]>4.) continue;
2466 minn = track->GetNumberOfClusters()+track->fNDeadZone;
2469 //if (longtrack) besttrack=longtrack;
2472 AliITSclusterV2 * clist[6];
2473 Float_t shared = GetNumberOfSharedClusters(besttrack,esdindex,list,clist);
2474 if (besttrack->fConstrain&&besttrack->fChi2MIP[0]<kMaxChi2PerCluster[0]&&besttrack->fChi2MIP[1]<kMaxChi2PerCluster[1]
2475 &&besttrack->fChi2MIP[2]<kMaxChi2PerCluster[2]&&besttrack->fChi2MIP[3]<kMaxChi2PerCluster[3]){
2476 //if (besttrack->fChi2MIP[0]<kMaxChi2PerCluster[0]&&besttrack->fChi2MIP[1]<kMaxChi2PerCluster[1]
2477 // &&besttrack->fChi2MIP[2]<kMaxChi2PerCluster[2]&&besttrack->fChi2MIP[3]<kMaxChi2PerCluster[3]){
2478 RegisterClusterTracks(besttrack,esdindex);
2485 Int_t sharedtrack = GetOverlapTrack(besttrack, esdindex, nshared, list, overlist);
2486 if (sharedtrack>=0){
2488 besttrack = GetBest2Tracks(esdindex,sharedtrack,10,5.5);
2490 shared = GetNumberOfSharedClusters(besttrack,esdindex,list,clist);
2496 if (shared>2.5) return 0;
2497 if (shared>1.0) return besttrack;
2499 // don't sign clusters if not gold track
2500 Double_t deltad = besttrack->GetD(GetX(),GetY());
2501 Double_t deltaz = besttrack->GetZat(GetX()) - GetZ();
2502 Double_t deltaprim = TMath::Sqrt(deltad*deltad+deltaz*deltaz);
2503 if (deltaprim>0.1 && (fConstraint[fPass])) return besttrack;
2504 if (TMath::Abs(deltad)>0.1) return besttrack;
2505 if (TMath::Abs(deltaz)>0.1) return besttrack;
2506 if (besttrack->fChi2MIP[0]>4.) return besttrack;
2507 if (besttrack->fChi2MIP[1]>4.) return besttrack;
2508 if (besttrack->fChi2MIP[2]>4.) return besttrack;
2509 if (besttrack->fChi2MIP[3]>4.) return besttrack;
2510 if (fConstraint[fPass]){
2514 Float_t *ny = GetNy(esdindex), *nz = GetNz(esdindex);
2515 for (Int_t i=0;i<6;i++){
2516 Int_t index = besttrack->fClIndex[i];
2517 if (index<=0) continue;
2518 Int_t ilayer = (index & 0xf0000000) >> 28;
2519 if (besttrack->fSigmaY[ilayer]<0.00000000001) continue;
2520 AliITSclusterV2 *c = (AliITSclusterV2*)GetCluster(index);
2522 if (ilayer>3&&c->GetNy()+c->GetNz()>6) continue;
2523 if ( (c->GetNy()+c->GetNz() )> ny[i]+nz[i]+0.7) continue; //shared track
2524 if ( c->GetNz()> nz[i]+0.7) continue; //shared track
2525 if ( ilayer>2&& besttrack->fNormQ[ilayer]/besttrack->fExpQ>1.5) continue;
2526 //if ( c->GetNy()> ny[i]+0.7) continue; //shared track
2528 Bool_t cansign = kTRUE;
2529 for (Int_t itrack=0;itrack<entries; itrack++){
2530 AliITStrackMI * track = (AliITStrackMI*)array->At(i);
2531 if (!track) continue;
2532 if (track->fChi2MIP[0]>besttrack->fChi2MIP[0]+2.*shared+1.) break;
2533 if ( (track->fClIndex[ilayer]>0) && (track->fClIndex[ilayer]!=besttrack->fClIndex[ilayer])){
2539 if (TMath::Abs(besttrack->fDy[ilayer]/besttrack->fSigmaY[ilayer])>3.) continue;
2540 if (TMath::Abs(besttrack->fDz[ilayer]/besttrack->fSigmaZ[ilayer])>3.) continue;
2541 if (!c->IsUsed()) c->Use();
2550 void AliITStrackerMI::GetBestHypothesysMIP(TObjArray &itsTracks)
2553 // get "best" hypothesys
2554 //for (Int_t ilayer=0;ilayer<6;ilayer++) fgLayers[ilayer].ResetWeights();
2557 Int_t nentries = itsTracks.GetEntriesFast();
2558 for (Int_t i=0;i<nentries;i++){
2559 AliITStrackMI* track = (AliITStrackMI*)itsTracks.At(i);
2560 if (!track) continue;
2561 TObjArray * array = (TObjArray*) fTrackHypothesys.At(i);
2562 if (!array) continue;
2563 if (array->GetEntriesFast()<=0) continue;
2565 AliITStrackMI* longtrack=0;
2567 Float_t maxchi2=1000;
2568 for (Int_t j=0;j<array->GetEntriesFast();j++){
2569 AliITStrackMI* track = (AliITStrackMI*)array->At(j);
2570 if (!track) continue;
2571 if (track->GetNumberOfClusters()+track->fNDeadZone<minn) continue;
2572 if (track->GetNumberOfClusters()+track->fNDeadZone>minn) maxchi2 = track->fChi2MIP[0];
2573 if (track->fChi2MIP[0]>maxchi2) continue;
2574 minn= track->GetNumberOfClusters()+track->fNDeadZone;
2575 maxchi2 = track->fChi2MIP[0];
2579 AliITStrackMI * besttrack = (AliITStrackMI*)array->At(0);
2580 if (!longtrack) {longtrack = besttrack;}
2581 else besttrack= longtrack;
2584 AliITSclusterV2 * clist[6];
2585 Float_t shared = GetNumberOfSharedClusters(longtrack,i,list,clist);
2587 track->fNUsed = shared;
2588 track->fNSkipped = besttrack->fNSkipped;
2589 track->fChi2MIP[0] = besttrack->fChi2MIP[0];
2594 Int_t sharedtrack = GetOverlapTrack(longtrack, i, nshared, list, overlist);
2595 //if (sharedtrack==-1) sharedtrack=0;
2596 if (sharedtrack>=0){
2597 besttrack = GetBest2Tracks(i,sharedtrack,10,5.5);
2600 if (besttrack&&fConstraint[fPass])
2601 UpdateESDtrack(besttrack,AliESDtrack::kITSin);
2602 //if (besttrack&&besttrack->fConstrain)
2603 // UpdateESDtrack(besttrack,AliESDtrack::kITSin);
2604 if (besttrack->fChi2MIP[0]+besttrack->fNUsed>1.5){
2605 if ( (TMath::Abs(besttrack->fD[0])>0.1) && fConstraint[fPass]) {
2606 track->fReconstructed= kFALSE;
2608 if ( (TMath::Abs(besttrack->fD[1])>0.1) && fConstraint[fPass]){
2609 track->fReconstructed= kFALSE;
2618 void AliITStrackerMI::CookLabel(AliITStrackMI *track,Float_t wrong) const {
2619 //--------------------------------------------------------------------
2620 //This function "cooks" a track label. If label<0, this track is fake.
2621 //--------------------------------------------------------------------
2624 if ( track->fESDtrack) tpcLabel = TMath::Abs(track->fESDtrack->GetTPCLabel());
2626 track->fChi2MIP[9]=0;
2628 for (Int_t i=0;i<track->GetNumberOfClusters();i++){
2629 Int_t cindex = track->GetClusterIndex(i);
2630 Int_t l=(cindex & 0xf0000000) >> 28;
2631 AliITSclusterV2 *cl = (AliITSclusterV2*)GetCluster(cindex);
2633 for (Int_t ind=0;ind<3;ind++){
2635 if (cl->GetLabel(ind)==tpcLabel) isWrong=0;
2637 track->fChi2MIP[9]+=isWrong*(2<<l);
2640 track->fFakeRatio = double(nwrong)/double(track->GetNumberOfClusters());
2642 if (track->fFakeRatio>wrong) track->fLab = -tpcLabel;
2644 track->fLab = tpcLabel;
2651 void AliITStrackerMI::CookdEdx(AliITStrackMI* track)
2656 //AliITSclusterV2 * clist[6];
2657 // Int_t shared = GetNumberOfSharedClusters(track,index,list,clist);
2660 track->fChi2MIP[9]=0;
2661 for (Int_t i=0;i<track->GetNumberOfClusters();i++){
2662 Int_t cindex = track->GetClusterIndex(i);
2663 Int_t l=(cindex & 0xf0000000) >> 28;
2664 AliITSclusterV2 *cl = (AliITSclusterV2*)GetCluster(cindex);
2665 Int_t lab = TMath::Abs(track->fESDtrack->GetTPCLabel());
2667 for (Int_t ind=0;ind<3;ind++){
2668 if (cl->GetLabel(ind)==lab) isWrong=0;
2670 track->fChi2MIP[9]+=isWrong*(2<<l);
2672 //if (l>3 && (cl->GetNy()>4) || (cl->GetNz()>4)) continue; //shared track
2673 //if (l>3&& !(cl->GetType()==1||cl->GetType()==10)) continue;
2674 //if (l<4&& !(cl->GetType()==1)) continue;
2675 dedx[accepted]= track->fdEdxSample[i];
2676 //dedx[accepted]= track->fNormQ[l];
2684 TMath::Sort(accepted,dedx,indexes,kFALSE);
2687 Double_t nl=low*accepted, nu =up*accepted;
2689 Float_t sumweight =0;
2690 for (Int_t i=0; i<accepted; i++) {
2692 if (i<nl+0.1) weight = TMath::Max(1.-(nl-i),0.);
2693 if (i>nu-1) weight = TMath::Max(nu-i,0.);
2694 sumamp+= dedx[indexes[i]]*weight;
2697 track->SetdEdx(sumamp/sumweight);
2701 void AliITStrackerMI::MakeCoeficients(Int_t ntracks){
2704 fCoeficients = new Float_t[ntracks*48];
2705 for (Int_t i=0;i<ntracks*48;i++) fCoeficients[i]=-1.;
2709 Double_t AliITStrackerMI::GetPredictedChi2MI(AliITStrackMI* track, const AliITSclusterV2 *cluster,Int_t layer)
2715 Float_t theta = track->GetTgl();
2716 Float_t phi = track->GetSnp();
2717 phi = TMath::Sqrt(phi*phi/(1.-phi*phi));
2718 GetError(layer,cluster,theta,phi,track->fExpQ,erry,errz);
2719 Double_t chi2 = track->GetPredictedChi2MI(cluster->GetY(),cluster->GetZ(),erry,errz);
2721 GetNTeor(layer,cluster, theta,phi,ny,nz);
2722 Double_t delta = cluster->GetNy()+cluster->GetNz()-nz-ny;
2724 chi2+=0.5*TMath::Min(delta/2,2.);
2725 chi2+=2.*cluster->GetDeltaProbability();
2728 track->fNy[layer] =ny;
2729 track->fNz[layer] =nz;
2730 track->fSigmaY[layer] = erry;
2731 track->fSigmaZ[layer] = errz;
2732 //track->fNormQ[layer] = cluster->GetQ()/TMath::Sqrt(1+theta*theta+phi*phi);
2733 track->fNormQ[layer] = cluster->GetQ()/TMath::Sqrt((1.+ track->fP3*track->fP3)/(1.- track->fP2*track->fP2));
2738 Int_t AliITStrackerMI::UpdateMI(AliITStrackMI* track, const AliITSclusterV2* cl,Double_t chi2,Int_t index) const
2743 Int_t layer = (index & 0xf0000000) >> 28;
2744 track->fClIndex[layer] = index;
2745 if ( (layer>1) &&track->fNormQ[layer]/track->fExpQ<0.5 ) {
2746 chi2+= (0.5-track->fNormQ[layer]/track->fExpQ)*10.;
2747 track->fdEdxMismatch+=(0.5-track->fNormQ[layer]/track->fExpQ)*10.;
2749 return track->UpdateMI(cl->GetY(),cl->GetZ(),track->fSigmaY[layer],track->fSigmaZ[layer],chi2,index);
2752 void AliITStrackerMI::GetNTeor(Int_t layer, const AliITSclusterV2* /*cl*/, Float_t theta, Float_t phi, Float_t &ny, Float_t &nz)
2758 ny = 1.+TMath::Abs(phi)*3.2;
2759 nz = 1.+TMath::Abs(theta)*0.34;
2763 ny = 1.+TMath::Abs(phi)*3.2;
2764 nz = 1.+TMath::Abs(theta)*0.28;
2769 ny = 2.02+TMath::Abs(phi)*1.95;
2770 nz = 2.02+TMath::Abs(phi)*2.35;
2773 ny = 6.6-2.7*TMath::Abs(phi);
2774 nz = 2.8-3.11*TMath::Abs(phi)+0.45*TMath::Abs(theta);
2779 Int_t AliITStrackerMI::GetError(Int_t layer, const AliITSclusterV2*cl, Float_t theta, Float_t phi,Float_t expQ, Float_t &erry, Float_t &errz)
2781 //calculate cluster position error
2784 GetNTeor(layer, cl,theta,phi,ny,nz);
2785 erry = TMath::Sqrt(cl->GetSigmaY2());
2786 errz = TMath::Sqrt(cl->GetSigmaZ2());
2791 if (TMath::Abs(ny-cl->GetNy())>0.6) {
2792 if (ny<cl->GetNy()){
2793 erry*=0.4+TMath::Abs(ny-cl->GetNy());
2794 errz*=0.4+TMath::Abs(ny-cl->GetNy());
2796 erry*=0.7+0.5*TMath::Abs(ny-cl->GetNy());
2797 errz*=0.7+0.5*TMath::Abs(ny-cl->GetNy());
2800 if (TMath::Abs(nz-cl->GetNz())>1.) {
2801 erry*=TMath::Abs(nz-cl->GetNz());
2802 errz*=TMath::Abs(nz-cl->GetNz());
2806 erry= TMath::Min(erry,float(0.005));
2807 errz= TMath::Min(errz,float(0.03));
2813 if (cl->GetNy()==100||cl->GetNz()==100){
2818 if (cl->GetNy()+cl->GetNz()>12){
2823 Float_t normq = cl->GetQ()/(TMath::Sqrt(1+theta*theta+phi*phi));
2824 Float_t chargematch = TMath::Max(double(normq/expQ),2.);
2826 if (cl->GetType()==1 || cl->GetType()==10 ){
2827 if (chargematch<1.0 || (cl->GetNy()+cl->GetNz()<nz+ny+0.5)){
2832 if (cl->GetNy()+cl->GetNz()<nz+ny+1.2){
2838 errz = TMath::Min(0.028*(chargematch+cl->GetNy()+cl->GetNz()-nz+ny),0.15);
2841 if (cl->GetType()==2 || cl->GetType()==11 ){
2842 erry = TMath::Min(0.0010*(1+chargematch+cl->GetNy()+cl->GetNz()-nz+ny),0.05);
2843 errz = TMath::Min(0.025*(1+chargematch+cl->GetNy()+cl->GetNz()-nz+ny),0.5);
2847 if (cl->GetType()>100 ){
2848 if ((chargematch+cl->GetNy()+cl->GetNz()-nz-ny<1.5)){
2853 if (cl->GetNy()+cl->GetNz()-nz-ny<1){
2859 errz = TMath::Min(0.05*(chargematch+cl->GetNy()+cl->GetNz()-nz-ny),0.4);
2860 erry = TMath::Min(0.003*(chargematch+cl->GetNy()+cl->GetNz()-nz-ny),0.05);
2863 Float_t diff = cl->GetNy()+cl->GetNz()-ny-nz;
2867 if (cl->GetType()==5||cl->GetType()==6||cl->GetType()==7||cl->GetType()==8){
2877 Float_t normq = cl->GetQ()/(TMath::Sqrt(1+theta*theta+phi*phi));
2878 Float_t chargematch = normq/expQ;
2880 Int_t cnz = cl->GetNz()%10;
2882 if (cl->GetType()==1){
2883 if (chargematch<1.25){
2884 erry = 0.0028*(1.+6./cl->GetQ()); // gold clusters
2887 erry = 0.003*chargematch;
2888 if (cl->GetNz()==3) erry*=1.5;
2890 if (chargematch<1.0){
2891 errz = 0.0011*(1.+6./cl->GetQ());
2894 errz = 0.002*(1+2*(chargematch-1.));
2898 errz*=1.4*(cnz-nz+0.5);
2901 if (cl->GetType()>1){
2903 erry = 0.00385*(1.+6./cl->GetQ()); // gold clusters
2904 errz = 0.0016*(1.+6./cl->GetQ());
2907 errz = 0.0014*(1+3*(chargematch-1.));
2908 erry = 0.003*(1+3*(chargematch-1.));
2912 errz*=1.4*(cnz-nz+0.5);
2916 if (TMath::Abs(cl->GetY())>2.5){
2917 factorz*=1+2*(TMath::Abs(cl->GetY())-2.5);
2919 if (TMath::Abs(cl->GetY())<1){
2920 factorz*=1.+0.5*TMath::Abs(TMath::Abs(cl->GetY())-1.);
2922 factorz= TMath::Min(factorz,float(4.));
2925 erry= TMath::Min(erry,float(0.05));
2926 errz= TMath::Min(errz,float(0.05));
2932 void AliITStrackerMI::SignDeltas( TObjArray *ClusterArray, Float_t vz)
2936 Int_t entries = ClusterArray->GetEntriesFast();
2937 if (entries<4) return;
2938 AliITSclusterV2* cluster = (AliITSclusterV2*)ClusterArray->At(0);
2939 Int_t layer = cluster->GetLayer();
2940 if (layer>1) return;
2942 Int_t ncandidates=0;
2943 Float_t r = (layer>0)? 7:4;
2945 for (Int_t i=0;i<entries;i++){
2946 AliITSclusterV2* cl0 = (AliITSclusterV2*)ClusterArray->At(i);
2947 Float_t nz = 1+TMath::Abs((cl0->GetZ()-vz)/r);
2948 if (cl0->GetNy()+cl0->GetNz()<=5+2*layer+nz) continue;
2949 index[ncandidates] = i; //candidate to belong to delta electron track
2951 if (cl0->GetNy()+cl0->GetNz()>9+2*layer+nz) {
2952 cl0->SetDeltaProbability(1);
2958 for (Int_t i=0;i<ncandidates;i++){
2959 AliITSclusterV2* cl0 = (AliITSclusterV2*)ClusterArray->At(index[i]);
2960 if (cl0->GetDeltaProbability()>0.8) continue;
2963 Float_t y[100],z[100],sumy,sumz,sumy2, sumyz, sumw;
2964 sumy=sumz=sumy2=sumyz=sumw=0.0;
2965 for (Int_t j=0;j<ncandidates;j++){
2967 AliITSclusterV2* cl1 = (AliITSclusterV2*)ClusterArray->At(index[j]);
2969 Float_t dz = cl0->GetZ()-cl1->GetZ();
2970 Float_t dy = cl0->GetY()-cl1->GetY();
2971 if (TMath::Sqrt(dz*dz+dy*dy)<0.2){
2972 Float_t weight = cl1->GetNy()+cl1->GetNz()-2;
2973 y[ncl] = cl1->GetY();
2974 z[ncl] = cl1->GetZ();
2975 sumy+= y[ncl]*weight;
2976 sumz+= z[ncl]*weight;
2977 sumy2+=y[ncl]*y[ncl]*weight;
2978 sumyz+=y[ncl]*z[ncl]*weight;
2983 if (ncl<4) continue;
2984 Float_t det = sumw*sumy2 - sumy*sumy;
2986 if (TMath::Abs(det)>0.01){
2987 Float_t z0 = (sumy2*sumz - sumy*sumyz)/det;
2988 Float_t k = (sumyz*sumw - sumy*sumz)/det;
2989 delta = TMath::Abs(cl0->GetZ()-(z0+k*cl0->GetY()));
2992 Float_t z0 = sumyz/sumy;
2993 delta = TMath::Abs(cl0->GetZ()-z0);
2996 cl0->SetDeltaProbability(1-20.*delta);
3002 void AliITStrackerMI::UpdateESDtrack(AliITStrackMI* track, ULong_t flags) const
3006 track->UpdateESDtrack(flags);
3007 AliITStrackMI * oldtrack = (AliITStrackMI*)(track->fESDtrack->GetITStrack());
3008 if (oldtrack) delete oldtrack;
3009 track->fESDtrack->SetITStrack(new AliITStrackMI(*track));
3015 void AliITStrackerMI::FindV0(AliESD */*event*/)
3020 AliHelix helixes[30000];
3021 TObjArray trackarray(30000);
3022 Float_t dist[30000];
3023 AliITSRecV0Info vertex;
3025 Int_t entries = fTrackHypothesys.GetEntriesFast();
3026 for (Int_t i=0;i<entries;i++){
3027 TObjArray * array = (TObjArray*)fTrackHypothesys.At(i);
3028 if (!array) continue;
3029 AliITStrackMI * track = (AliITStrackMI*)array->At(fBestTrackIndex[i]);
3031 dist[i] = TMath::Sqrt(track->fD[0]*track->fD[0]+track->fD[1]*track->fD[1]);
3032 trackarray.AddAt(track,i);
3033 new (&helixes[i]) AliHelix(*track);
3036 for (Int_t itrack0=0;itrack0<entries;itrack0++){
3037 AliITStrackMI * track0 = (AliITStrackMI*)trackarray.At(itrack0);
3038 if (!track0) continue;
3039 if (dist[itrack0]<0.2) continue;
3040 for (Int_t itrack1=itrack0+1;itrack1<entries;itrack1++){
3041 AliITStrackMI * track1 = (AliITStrackMI*)trackarray.At(itrack1);
3042 if (!track1) continue;
3043 if (dist[itrack1]<0.2) continue;
3044 if (track1->fP4*track0->fP4>0) continue; //the same sign
3045 AliHelix *h1 = &helixes[itrack0];
3046 AliHelix *h2 = &helixes[itrack1];
3048 Double_t distance = TestV0(h1,h2,&vertex);
3049 if (distance>0.4) continue;
3050 if (vertex.fRr<0.3) continue;
3051 if (vertex.fRr>27) continue;
3052 Float_t v[3]={GetX(),GetY(),GetZ()};
3053 vertex.Update(v,track0->fMass, track1->fMass);
3055 if ((TMath::Abs(vertex.fInvMass-0.4976)<0.05 || TMath::Abs(vertex.fInvMass-0.0)<0.1|| TMath::Abs(vertex.fInvMass-1.1)<0.1)) {
3056 if (vertex.fPointAngle<0.85) continue;
3059 if (vertex.fPointAngle<0.98) continue;
3061 if (TMath::Abs(TMath::Abs(track0->fLab)-TMath::Abs(track1->fLab))<2){
3062 Float_t mindist = FindBestPair(itrack0,itrack1,&vertex);
3063 if (mindist>1) FindBestPair(itrack0,itrack1,&vertex);
3069 Double_t AliITStrackerMI::FindBestPair(Int_t esdtrack0, Int_t esdtrack1,AliITSRecV0Info *vertex)
3072 // try to find best pair from the tree of track hyp.
3074 TObjArray * array0 = (TObjArray*)fTrackHypothesys.At(esdtrack0);
3075 Int_t entries0 = array0->GetEntriesFast();
3076 TObjArray * array1 = (TObjArray*)fTrackHypothesys.At(esdtrack1);
3077 Int_t entries1 = array1->GetEntriesFast();
3081 AliITSRecV0Info vbest;
3082 Double_t criticalradius = vertex->fRr;
3083 Double_t mindist =1000;
3086 for (Int_t itrack0=0;itrack0<entries0;itrack0++){
3087 AliITStrackMI * track0 = (AliITStrackMI*)array0->At(itrack0);
3088 if (!track0) continue;
3089 if (track0->fX<criticalradius-1) continue;
3090 if (track0->fX>criticalradius+5) continue;
3091 for (Int_t itrack1=0;itrack1<entries1;itrack1++){
3092 AliITStrackMI * track1 = (AliITStrackMI*)array1->At(itrack1);
3093 if (!track1) continue;
3094 if (track1->fX<criticalradius-1) continue;
3095 if (track1->fX>criticalradius+5) continue;
3097 AliHelix h0(*track0);
3098 AliHelix h1(*track1);
3099 Double_t distance = TestV0(&h0,&h1,&v0);
3100 if (v0.fRr>30) continue;
3101 if (v0.fRr<0.2) continue;
3102 Float_t v[3]={GetX(),GetY(),GetZ()};
3103 v0.Update(v,track0->fMass, track1->fMass);
3104 if (distance<mindist){
3106 bestpair[0]=itrack0;
3107 bestpair[1]=itrack1;
3120 void AliITSRecV0Info::Update(Float_t vertex[3], Float_t mass1, Float_t mass2)
3123 //Update V0 information
3125 Float_t v[3] = {fXr[0]-vertex[0],fXr[1]-vertex[1],fXr[2]-vertex[2]};
3126 Float_t p[3] = {fPdr[0]+fPm[0], fPdr[1]+fPm[1],fPdr[2]+fPm[2]};
3128 Float_t vnorm2 = v[0]*v[0]+v[1]*v[1];
3129 Float_t vnorm3 = TMath::Sqrt(v[2]*v[2]+vnorm2);
3130 vnorm2 = TMath::Sqrt(vnorm2);
3131 Float_t pnorm2 = p[0]*p[0]+p[1]*p[1];
3132 Float_t pnorm3 = TMath::Sqrt(p[2]*p[2]+pnorm2);
3133 pnorm2 = TMath::Sqrt(pnorm2);
3135 fPointAngleFi = (v[0]*p[0]+v[1]*p[1])/(vnorm2*pnorm2);
3136 fPointAngleTh = (v[2]*p[2]+vnorm2*pnorm2)/(vnorm3*pnorm3);
3137 fPointAngle = (v[0]*p[0]+v[1]*p[1]+v[2]*p[2])/(vnorm3*pnorm3);
3139 Float_t e1 = TMath::Sqrt(mass1*mass1+
3143 Float_t e2 = TMath::Sqrt(mass2*mass2+
3149 (fPm[0]+fPdr[0])*(fPm[0]+fPdr[0])+
3150 (fPm[1]+fPdr[1])*(fPm[1]+fPdr[1])+
3151 (fPm[2]+fPdr[2])*(fPm[2]+fPdr[2]);
3153 fInvMass = TMath::Sqrt((e1+e2)*(e1+e2)-fInvMass);
3160 Double_t AliITStrackerMI::TestV0(AliHelix *helix1, AliHelix *helix2, AliITSRecV0Info *vertex)
3163 // test the helixes for the distnce calculate vertex characteristic
3165 Float_t distance1,distance2;
3166 AliHelix & dhelix1 = *helix1;
3167 Double_t pp[3],xx[3];
3168 dhelix1.GetMomentum(0,pp,0);
3169 dhelix1.Evaluate(0,xx);
3170 AliHelix &mhelix = *helix2;
3172 //find intersection linear
3174 Double_t phase[2][2],radius[2];
3175 Int_t points = dhelix1.GetRPHIintersections(mhelix, phase, radius);
3176 Double_t delta1=10000,delta2=10000;
3179 dhelix1.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1);
3180 dhelix1.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1);
3181 dhelix1.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1);
3184 dhelix1.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2);
3185 dhelix1.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2);
3186 dhelix1.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2);
3188 distance1 = TMath::Min(delta1,delta2);
3189 vertex->fDist1 = TMath::Sqrt(distance1);
3191 //find intersection parabolic
3193 points = dhelix1.GetRPHIintersections(mhelix, phase, radius);
3194 delta1=10000,delta2=10000;
3197 dhelix1.ParabolicDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1);
3200 dhelix1.ParabolicDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2);
3203 distance2 = TMath::Min(delta1,delta2);
3204 vertex->fDist2 = TMath::Sqrt(distance2);
3208 dhelix1.Evaluate(phase[0][0],vertex->fXr);
3209 dhelix1.GetMomentum(phase[0][0],vertex->fPdr);
3210 mhelix.GetMomentum(phase[0][1],vertex->fPm);
3211 dhelix1.GetAngle(phase[0][0],mhelix,phase[0][1],vertex->fAngle);
3212 vertex->fRr = TMath::Sqrt(radius[0]);
3215 dhelix1.Evaluate(phase[1][0],vertex->fXr);
3216 dhelix1.GetMomentum(phase[1][0],vertex->fPdr);
3217 mhelix.GetMomentum(phase[1][1],vertex->fPm);
3218 dhelix1.GetAngle(phase[1][0],mhelix,phase[1][1],vertex->fAngle);
3219 vertex->fRr = TMath::Sqrt(radius[1]);
3224 return vertex->fDist2;