1 /**************************************************************************
2 * Copyright(c) 1998-2003, 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 vertexer from tracks
19 // Origin: AliITSVertexerTracks
21 // andrea.dainese@pd.infn.it
23 // massimo.masera@to.infn.it
24 // Moved to STEER and adapted to ESD tracks:
25 // F.Prino, Torino, prino@to.infn.it
26 //-----------------------------------------------------------------
28 //---- Root headers --------
30 #include <TClonesArray.h>
31 #include <TDirectory.h>
33 //---- AliRoot headers -----
34 #include "AliStrLine.h"
35 #include "AliExternalTrackParam.h"
36 #include "AliNeutralTrackParam.h"
37 #include "AliVEvent.h"
38 #include "AliVTrack.h"
39 #include "AliESDtrack.h"
40 #include "AliESDEvent.h"
41 #include "AliVertexerTracks.h"
44 ClassImp(AliVertexerTracks)
47 //----------------------------------------------------------------------------
48 AliVertexerTracks::AliVertexerTracks():
75 fSelectOnTOFBunchCrossing(kFALSE),
76 fKeepAlsoUnflaggedTOFBunchCrossing(kTRUE),
87 fMVFinalWBinary(kTRUE),
91 fDeltaZCutForCluster(0.1),
92 fnSigmaZCutForCluster(999999.)
95 // Default constructor
100 //----------------------------------------------------------------------------
101 AliVertexerTracks::AliVertexerTracks(Double_t fieldkG):
128 fSelectOnTOFBunchCrossing(kFALSE),
129 fKeepAlsoUnflaggedTOFBunchCrossing(kTRUE),
136 fMVMinSig2Red(0.005),
140 fMVFinalWBinary(kTRUE),
144 fDeltaZCutForCluster(0.1),
145 fnSigmaZCutForCluster(999999.)
148 // Standard constructor
153 //-----------------------------------------------------------------------------
154 AliVertexerTracks::~AliVertexerTracks()
156 // Default Destructor
157 // The objects pointed by the following pointer are not owned
158 // by this class and are not deleted
160 if(fTrksToSkip) { delete [] fTrksToSkip; fTrksToSkip=NULL; fNTrksToSkip=0;}
161 if(fIdSel) { delete [] fIdSel; fIdSel=NULL; }
162 if(fMVVertices) delete fMVVertices;
165 //----------------------------------------------------------------------------
166 AliESDVertex* AliVertexerTracks::FindPrimaryVertex(const AliVEvent *vEvent)
169 // Primary vertex for current ESD or AOD event
171 // 1st with 5*fNSigma*sigma cut w.r.t. to initial vertex
172 // + cut on sqrt(d0d0+z0z0) if fConstraint=kFALSE
173 // 2nd with fNSigma*sigma cut w.r.t. to vertex found in 1st iteration)
176 TString evtype = vEvent->IsA()->GetName();
177 Bool_t inputAOD = ((evtype=="AliAODEvent") ? kTRUE : kFALSE);
179 if(inputAOD && fMode==1) {
180 printf("Error : AliVertexerTracks: no TPC-only vertex from AOD\n");
182 return fCurrentVertex;
185 // accept 1-track case only if constraint is available
186 if(!fConstraint && fMinTracks==1) fMinTracks=2;
188 // read tracks from AlivEvent
189 Int_t nTrks = (Int_t)vEvent->GetNumberOfTracks();
190 if(nTrks<fMinTracks) {
192 return fCurrentVertex;
195 int bcRound = fBCSpacing/25; // profit from larger than 25ns spacing and set correct BC
196 TDirectory * olddir = gDirectory;
198 if(nTrks>500) f = new TFile("VertexerTracks.root","recreate");
199 TObjArray trkArrayOrig(nTrks);
200 UShort_t *idOrig = new UShort_t[nTrks];
201 Double_t *zTr = new Double_t[nTrks];
202 Double_t *err2zTr = new Double_t[nTrks];
205 AliExternalTrackParam *t=0;
207 for(Int_t i=0; i<nTrks; i++) {
208 AliVTrack *track = (AliVTrack*)vEvent->GetTrack(i);
209 // check tracks to skip
210 Bool_t skipThis = kFALSE;
211 for(Int_t j=0; j<fNTrksToSkip; j++) {
212 if(track->GetID()==fTrksToSkip[j]) {
213 AliDebug(1,Form("skipping track: %d",i));
217 if(skipThis) continue;
219 // skip pure ITS SA tracks (default)
220 if(!fITSpureSA && (track->GetStatus()&AliESDtrack::kITSpureSA)) continue;
221 // or use only pure ITS SA tracks
222 if(fITSpureSA && !(track->GetStatus()&AliESDtrack::kITSpureSA)) continue;
225 if(fMode==0 && fITSrefit && !(track->GetStatus()&AliESDtrack::kITSrefit)) continue;
227 if(!inputAOD) { // ESD
228 AliESDtrack* esdt = (AliESDtrack*)track;
229 if(esdt->GetNcls(fMode) < fMinClusters) continue;
230 if(fMode==0) { // ITS mode
231 Double_t x,p[5],cov[15];
232 esdt->GetExternalParameters(x,p);
233 esdt->GetExternalCovariance(cov);
234 t = new AliExternalTrackParam(x,esdt->GetAlpha(),p,cov);
235 } else if(fMode==1) { // TPC mode
236 t = (AliExternalTrackParam*)esdt->GetTPCInnerParam();
238 Double_t radius = 2.8; //something less than the beam pipe radius
239 if(!PropagateTrackTo(t,radius)) continue;
241 } else { // AOD (only ITS mode)
243 for(Int_t l=0;l<6;l++) if(TESTBIT(track->GetITSClusterMap(),l)) ncls0++;
244 if(ncls0 < fMinClusters) continue;
245 t = new AliExternalTrackParam(); t->CopyFromVTrack(track);
248 // use TOF info about bunch crossing
249 if(fSelectOnTOFBunchCrossing) {
250 int bc = track->GetTOFBunchCrossing(fFieldkG);
251 if (bc>AliVTrack::kTOFBCNA) bc /= bcRound;
252 t->SetUniqueID(UInt_t(bc + kTOFBCShift));
255 trkArrayOrig.AddLast(t);
256 idOrig[nTrksOrig]=(UShort_t)track->GetID();
257 zTr[nTrksOrig]=t->GetZ();
258 err2zTr[nTrksOrig]=t->GetSigmaZ2();
261 } // end loop on tracks
263 // call method that will reconstruct the vertex
264 if(fClusterize) FindAllVertices(nTrksOrig,&trkArrayOrig,zTr,err2zTr,idOrig);
265 else FindPrimaryVertex(&trkArrayOrig,idOrig);
266 if(!inputAOD) AnalyzePileUp((AliESDEvent*)vEvent);
268 if(fMode==0) trkArrayOrig.Delete();
269 delete [] idOrig; idOrig=NULL;
270 delete [] zTr; zTr=NULL;
271 delete [] err2zTr; err2zTr=NULL;
274 f->Close(); delete f; f = NULL;
275 gSystem->Unlink("VertexerTracks.root");
279 // set vertex ID for tracks used in the fit
281 if(!inputAOD && fCurrentVertex) {
282 Int_t nIndices = fCurrentVertex->GetNIndices();
283 UShort_t *indices = fCurrentVertex->GetIndices();
284 for(Int_t ind=0; ind<nIndices; ind++) {
285 AliESDtrack *esdt = (AliESDtrack*)vEvent->GetTrack(indices[ind]);
286 esdt->SetVertexID(-1);
290 return fCurrentVertex;
292 //----------------------------------------------------------------------------
293 AliESDVertex* AliVertexerTracks::FindPrimaryVertex(const TObjArray *trkArrayOrig,
297 // Primary vertex using the AliExternalTrackParam's in the TObjArray.
298 // idOrig must contain the track IDs from AliESDtrack::GetID()
300 // 1st with 5*fNSigma*sigma cut w.r.t. to initial vertex
301 // + cut on sqrt(d0d0+z0z0) if fConstraint=kFALSE
302 // 2nd with fNSigma*sigma cut w.r.t. to vertex found in 1st iteration)
305 // accept 1-track case only if constraint is available
306 if(!fConstraint && fMinTracks==1) fMinTracks=2;
308 // read tracks from array
309 Int_t nTrksOrig = (Int_t)trkArrayOrig->GetEntriesFast();
310 AliDebug(1,Form("Initial number of tracks: %d",nTrksOrig));
311 if(nTrksOrig<fMinTracks) {
312 AliDebug(1,"TooFewTracks");
314 return fCurrentVertex;
317 // If fConstraint=kFALSE
318 // run VertexFinder(1) to get rough estimate of initVertex (x,y)
320 // fill fTrkArraySel, for VertexFinder()
321 fIdSel = new UShort_t[nTrksOrig];
322 PrepareTracks(*trkArrayOrig,idOrig,0);
323 if(fIdSel) { delete [] fIdSel; fIdSel=NULL; }
324 Double_t cutsave = fDCAcut;
325 fDCAcut = fDCAcutIter0;
327 switch (fAlgoIter0) {
328 case 1: StrLinVertexFinderMinDist(1); break;
329 case 2: StrLinVertexFinderMinDist(0); break;
330 case 3: HelixVertexFinder(); break;
331 case 4: VertexFinder(1); break;
332 case 5: VertexFinder(0); break;
333 default: printf("Wrong algorithm\n"); break;
336 if(fVert.GetNContributors()>0) {
337 fVert.GetXYZ(fNominalPos);
338 fNominalPos[0] = fVert.GetXv();
339 fNominalPos[1] = fVert.GetYv();
340 fNominalPos[2] = fVert.GetZv();
341 AliDebug(1,Form("No mean vertex: VertexFinder gives (%f, %f, %f)",fNominalPos[0],fNominalPos[1],fNominalPos[2]));
346 AliDebug(1,"No mean vertex and VertexFinder failed");
353 // propagate tracks to fNominalPos vertex
355 // if(constraint) reject for |d0|>5*fNSigma*sigma w.r.t. fNominal... vertex
356 // else reject for |d0|\oplus|z0| > 5 mm w.r.t. fNominal... vertex
358 // propagate tracks to best between initVertex and fCurrentVertex
359 // preselect tracks (reject for |d0|>fNSigma*sigma w.r.t. best
360 // between initVertex and fCurrentVertex)
361 Bool_t multiMode = kFALSE;
362 for(Int_t iter=1; iter<=2; iter++) {
363 if (fAlgo==kMultiVertexer && iter==2) break; // multivertexer does not need 2 iterations
364 if(fOnlyFitter && iter==1) continue;
365 if(fIdSel) { delete [] fIdSel; fIdSel=NULL; }
366 fIdSel = new UShort_t[nTrksOrig];
367 Int_t nTrksSel = PrepareTracks(*trkArrayOrig,idOrig,iter);
368 AliDebug(1,Form("N tracks selected in iteration %d: %d",iter,nTrksSel));
369 if(nTrksSel < fMinTracks) {
371 return fCurrentVertex;
376 if(nTrksSel==1 && fAlgo!=kMultiVertexer) {
377 AliDebug(1,"Just one track");
378 OneTrackVertFinder();
381 case kStrLinVertexFinderMinDist1: StrLinVertexFinderMinDist(1); break;
382 case kStrLinVertexFinderMinDist0: StrLinVertexFinderMinDist(0); break;
383 case kHelixVertexFinder : HelixVertexFinder(); break;
384 case kVertexFinder1 : VertexFinder(1); break;
385 case kVertexFinder0 : VertexFinder(0); break;
386 case kMultiVertexer : FindVerticesMV(); multiMode = kTRUE; break;
387 default: printf("Wrong algorithm"); break;
390 AliDebug(1," Vertex finding completed");
392 if (multiMode) break; // // multivertexer does not need 2nd iteration
395 } // end loop on the two iterations
397 if (!multiMode || fMVVertices->GetEntries()==0) { // in multi-vertex mode this is already done for found vertices
398 // set indices of used tracks
399 UShort_t *indices = 0;
400 if(fCurrentVertex->GetNContributors()>0) {
401 Int_t nIndices = (Int_t)fTrkArraySel.GetEntriesFast();
402 indices = new UShort_t[nIndices];
403 for(Int_t jj=0; jj<nIndices; jj++)
404 indices[jj] = fIdSel[jj];
405 fCurrentVertex->SetIndices(nIndices,indices);
407 if (indices) {delete [] indices; indices=NULL;}
410 TString title="VertexerTracksNoConstraint";
412 title="VertexerTracksWithConstraint";
413 if(fOnlyFitter) title.Append("OnlyFitter");
415 fCurrentVertex->SetTitle(title.Data());
417 AliDebug(1,Form("xyz: %f %f %f; nc %d",fCurrentVertex->GetXv(),fCurrentVertex->GetYv(),fCurrentVertex->GetZv(),fCurrentVertex->GetNContributors()));
420 delete [] fIdSel; fIdSel=NULL;
421 fTrkArraySel.Delete();
422 if(fTrksToSkip) { delete [] fTrksToSkip; fTrksToSkip=NULL; }
425 return fCurrentVertex;
427 //------------------------------------------------------------------------
428 Double_t AliVertexerTracks::GetDeterminant3X3(Double_t matr[][3])
431 Double_t det=matr[0][0]*matr[1][1]*matr[2][2]-matr[0][0]*matr[1][2]*matr[2][1]-matr[0][1]*matr[1][0]*matr[2][2]+matr[0][1]*matr[1][2]*matr[2][0]+matr[0][2]*matr[1][0]*matr[2][1]-matr[0][2]*matr[1][1]*matr[2][0];
434 //-------------------------------------------------------------------------
435 void AliVertexerTracks::GetStrLinDerivMatrix(const Double_t *p0,const Double_t *p1,Double_t (*m)[3],Double_t *d)
438 Double_t x12=p0[0]-p1[0];
439 Double_t y12=p0[1]-p1[1];
440 Double_t z12=p0[2]-p1[2];
441 Double_t kk=x12*x12+y12*y12+z12*z12;
442 m[0][0]=2-2/kk*x12*x12;
443 m[0][1]=-2/kk*x12*y12;
444 m[0][2]=-2/kk*x12*z12;
445 m[1][0]=-2/kk*x12*y12;
446 m[1][1]=2-2/kk*y12*y12;
447 m[1][2]=-2/kk*y12*z12;
448 m[2][0]=-2/kk*x12*z12;
450 m[2][2]=2-2/kk*z12*z12;
451 d[0]=2*p0[0]-2/kk*p0[0]*x12*x12-2/kk*p0[2]*x12*z12-2/kk*p0[1]*x12*y12;
452 d[1]=2*p0[1]-2/kk*p0[1]*y12*y12-2/kk*p0[0]*x12*y12-2/kk*p0[2]*z12*y12;
453 d[2]=2*p0[2]-2/kk*p0[2]*z12*z12-2/kk*p0[0]*x12*z12-2/kk*p0[1]*z12*y12;
456 //--------------------------------------------------------------------------
457 void AliVertexerTracks::GetStrLinDerivMatrix(const Double_t *p0,const Double_t *p1,const Double_t *sigmasq,Double_t (*m)[3],Double_t *d)
460 Double_t x12=p1[0]-p0[0];
461 Double_t y12=p1[1]-p0[1];
462 Double_t z12=p1[2]-p0[2];
464 Double_t den= x12*x12*sigmasq[1]*sigmasq[2]+y12*y12*sigmasq[0]*sigmasq[2]+z12*z12*sigmasq[0]*sigmasq[1];
466 Double_t kk= 2*(x12*x12/sigmasq[0]+y12*y12/sigmasq[1]+z12*z12/sigmasq[2]);
469 cc[0]=-x12/sigmasq[0];
470 cc[1]=-y12/sigmasq[1];
471 cc[2]=-z12/sigmasq[2];
473 Double_t ww=(-p0[0]*x12*sigmasq[1]*sigmasq[2]-p0[1]*y12*sigmasq[0]*sigmasq[2]-p0[2]*z12*sigmasq[0]*sigmasq[1])/den;
475 Double_t ss= -p0[0]*cc[0]-p0[1]*cc[1]-p0[2]*cc[2];
478 aa[0]=x12*sigmasq[1]*sigmasq[2]/den;
479 aa[1]=y12*sigmasq[0]*sigmasq[2]/den;
480 aa[2]=z12*sigmasq[0]*sigmasq[1]/den;
482 m[0][0]=aa[0]*(aa[0]*kk+2*cc[0])+2*cc[0]*aa[0]+2/sigmasq[0];
483 m[0][1]=aa[1]*(aa[0]*kk+2*cc[0])+2*cc[1]*aa[0];
484 m[0][2]=aa[2]*(aa[0]*kk+2*cc[0])+2*cc[2]*aa[0];
486 m[1][0]=aa[0]*(aa[1]*kk+2*cc[1])+2*cc[0]*aa[1];
487 m[1][1]=aa[1]*(aa[1]*kk+2*cc[1])+2*cc[1]*aa[1]+2/sigmasq[1];
488 m[1][2]=aa[2]*(aa[1]*kk+2*cc[1])+2*cc[2]*aa[1];
490 m[2][0]=aa[0]*(aa[2]*kk+2*cc[2])+2*cc[0]*aa[2];
491 m[2][1]=aa[1]*(aa[2]*kk+2*cc[2])+2*cc[1]*aa[2];
492 m[2][2]=aa[2]*(aa[2]*kk+2*cc[2])+2*cc[2]*aa[2]+2/sigmasq[2];
494 d[0]=-ww*(aa[0]*kk+2*cc[0])-2*ss*aa[0]+2*p0[0]/sigmasq[0];
495 d[1]=-ww*(aa[1]*kk+2*cc[1])-2*ss*aa[1]+2*p0[1]/sigmasq[1];
496 d[2]=-ww*(aa[2]*kk+2*cc[2])-2*ss*aa[2]+2*p0[2]/sigmasq[2];
499 //--------------------------------------------------------------------------
500 Double_t AliVertexerTracks::GetStrLinMinDist(const Double_t *p0,const Double_t *p1,const Double_t *x0)
503 Double_t x12=p0[0]-p1[0];
504 Double_t y12=p0[1]-p1[1];
505 Double_t z12=p0[2]-p1[2];
506 Double_t x10=p0[0]-x0[0];
507 Double_t y10=p0[1]-x0[1];
508 Double_t z10=p0[2]-x0[2];
509 // return ((x10*x10+y10*y10+z10*z10)*(x12*x12+y12*y12+z12*z12)-(x10*x12+y10*y12+z10*z12)*(x10*x12+y10*y12+z10*z12))/(x12*x12+y12*y12+z12*z12);
510 return ((y10*z12-z10*y12)*(y10*z12-z10*y12)+
511 (z10*x12-x10*z12)*(z10*x12-x10*z12)+
512 (x10*y12-y10*x12)*(x10*y12-y10*x12))
513 /(x12*x12+y12*y12+z12*z12);
515 //---------------------------------------------------------------------------
516 void AliVertexerTracks::OneTrackVertFinder()
518 // find vertex for events with 1 track, using DCA to nominal beam axis
519 AliDebug(1,Form("Number of prepared tracks =%d - Call OneTrackVertFinder",fTrkArraySel.GetEntries()));
520 AliExternalTrackParam *track1;
521 track1 = (AliExternalTrackParam*)fTrkArraySel.At(0);
522 Double_t alpha=track1->GetAlpha();
523 Double_t mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1];
524 Double_t pos[3],dir[3];
525 track1->GetXYZAt(mindist,GetFieldkG(),pos);
526 track1->GetPxPyPzAt(mindist,GetFieldkG(),dir);
527 AliStrLine *line1 = new AliStrLine(pos,dir);
528 Double_t p1[3]={fNominalPos[0],fNominalPos[1],0.};
529 Double_t p2[3]={fNominalPos[0],fNominalPos[1],10.};
530 AliStrLine *zeta=new AliStrLine(p1,p2,kTRUE);
531 Double_t crosspoint[3]={0.,0.,0.};
534 Int_t retcode = zeta->Cross(line1,crosspoint);
536 sigma=line1->GetDistFromPoint(crosspoint);
541 fVert.SetXYZ(crosspoint);
542 fVert.SetDispersion(sigma);
543 fVert.SetNContributors(nContrib);
545 //---------------------------------------------------------------------------
546 void AliVertexerTracks::HelixVertexFinder()
548 // Get estimate of vertex position in (x,y) from tracks DCA
553 for(Int_t i=0;i<2;i++)initPos[i]=fNominalPos[i];
555 Int_t nacc = (Int_t)fTrkArraySel.GetEntriesFast();
557 Double_t aver[3]={0.,0.,0.};
558 Double_t averquad[3]={0.,0.,0.};
559 Double_t sigmaquad[3]={0.,0.,0.};
562 AliExternalTrackParam *track1;
563 AliExternalTrackParam *track2;
566 Double_t alpha, cs, sn;
567 Double_t crosspoint[3];
568 for(Int_t i=0; i<nacc; i++){
569 track1 = (AliExternalTrackParam*)fTrkArraySel.At(i);
572 for(Int_t j=i+1; j<nacc; j++){
573 track2 = (AliExternalTrackParam*)fTrkArraySel.At(j);
575 distCA=track2->PropagateToDCA(track1,GetFieldkG());
576 if(fDCAcut<=0 ||(fDCAcut>0&&distCA<fDCAcut)){
578 alpha=track1->GetAlpha();
579 cs=TMath::Cos(alpha); sn=TMath::Sin(alpha);
580 Double_t x1=x*cs - track1->GetY()*sn;
581 Double_t y1=x*sn + track1->GetY()*cs;
582 Double_t z1=track1->GetZ();
584 Double_t sx1=sn*sn*track1->GetSigmaY2(), sy1=cs*cs*track1->GetSigmaY2();
586 alpha=track2->GetAlpha();
587 cs=TMath::Cos(alpha); sn=TMath::Sin(alpha);
588 Double_t x2=x*cs - track2->GetY()*sn;
589 Double_t y2=x*sn + track2->GetY()*cs;
590 Double_t z2=track2->GetZ();
591 Double_t sx2=sn*sn*track2->GetSigmaY2(), sy2=cs*cs*track2->GetSigmaY2();
592 Double_t sz1=track1->GetSigmaZ2(), sz2=track2->GetSigmaZ2();
593 Double_t wx1=sx2/(sx1+sx2), wx2=1.- wx1;
594 Double_t wy1=sy2/(sy1+sy2), wy2=1.- wy1;
595 Double_t wz1=sz2/(sz1+sz2), wz2=1.- wz1;
596 crosspoint[0]=wx1*x1 + wx2*x2;
597 crosspoint[1]=wy1*y1 + wy2*y2;
598 crosspoint[2]=wz1*z1 + wz2*z2;
601 for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj];
602 for(Int_t jj=0;jj<3;jj++)averquad[jj]+=(crosspoint[jj]*crosspoint[jj]);
608 for(Int_t jj=0;jj<3;jj++){
609 initPos[jj] = aver[jj]/ncombi;
610 averquad[jj]/=ncombi;
611 sigmaquad[jj]=averquad[jj]-initPos[jj]*initPos[jj];
612 sigma+=sigmaquad[jj];
614 sigma=TMath::Sqrt(TMath::Abs(sigma));
617 Warning("HelixVertexFinder","Finder did not succed");
620 fVert.SetXYZ(initPos);
621 fVert.SetDispersion(sigma);
622 fVert.SetNContributors(ncombi);
624 //----------------------------------------------------------------------------
625 Int_t AliVertexerTracks::PrepareTracks(const TObjArray &trkArrayOrig,
626 const UShort_t *idOrig,
630 // Propagate tracks to initial vertex position and store them in a TObjArray
632 AliDebug(1," PrepareTracks()");
634 Int_t nTrksOrig = (Int_t)trkArrayOrig.GetEntriesFast();
637 Double_t sigmaCurr[3];
638 Double_t normdistx,normdisty;
639 Double_t d0z0[2],covd0z0[3];
642 AliESDVertex *initVertex = new AliESDVertex(fNominalPos,fNominalCov,1,1);
644 if(!fTrkArraySel.IsEmpty()) fTrkArraySel.Delete();
646 AliExternalTrackParam *track=0;
649 for(Int_t i=0; i<nTrksOrig; i++) {
650 AliExternalTrackParam *trackOrig=(AliExternalTrackParam*)trkArrayOrig.At(i);
651 if(trackOrig->Charge()!=0) { // normal tracks
652 track = new AliExternalTrackParam(*(AliExternalTrackParam*)trkArrayOrig.At(i));
653 } else { // neutral tracks (from a V0)
654 track = new AliNeutralTrackParam(*(AliNeutralTrackParam*)trkArrayOrig.At(i));
656 track->SetUniqueID(trackOrig->GetUniqueID());
658 if(TMath::Abs(track->GetTgl())>fMaxTgl) {
659 AliDebug(1,Form(" rejecting track with tgl = %f",track->GetTgl()));
660 delete track; continue;
663 Bool_t propagateOK = kFALSE, cutond0z0 = kTRUE;
664 // propagate track to vertex
665 if(optImpParCut<2 || fOnlyFitter) { // optImpParCut==1 or 0
666 propagateOK = track->PropagateToDCA(initVertex,GetFieldkG(),100.,d0z0,covd0z0);
667 } else { // optImpParCut==2
668 fCurrentVertex->GetSigmaXYZ(sigmaCurr);
669 normdistx = TMath::Abs(fCurrentVertex->GetXv()-fNominalPos[0])/TMath::Sqrt(sigmaCurr[0]*sigmaCurr[0]+fNominalCov[0]);
670 normdisty = TMath::Abs(fCurrentVertex->GetYv()-fNominalPos[1])/TMath::Sqrt(sigmaCurr[1]*sigmaCurr[1]+fNominalCov[2]);
671 AliDebug(1,Form("normdistx %f %f %f",fCurrentVertex->GetXv(),fNominalPos[0],TMath::Sqrt(sigmaCurr[0]*sigmaCurr[0]+fNominalCov[0])));
672 AliDebug(1,Form("normdisty %f %f %f",fCurrentVertex->GetYv(),fNominalPos[1],TMath::Sqrt(sigmaCurr[1]*sigmaCurr[1]+fNominalCov[2])));
673 AliDebug(1,Form("sigmaCurr %f %f %f",sigmaCurr[0],sigmaCurr[1],TMath::Sqrt(fNominalCov[0])+TMath::Sqrt(fNominalCov[2])));
674 if(normdistx < 3. && normdisty < 3. &&
675 (sigmaCurr[0]+sigmaCurr[1])<(TMath::Sqrt(fNominalCov[0])+TMath::Sqrt(fNominalCov[2]))) {
676 propagateOK = track->PropagateToDCA(fCurrentVertex,GetFieldkG(),100.,d0z0,covd0z0);
678 propagateOK = track->PropagateToDCA(initVertex,GetFieldkG(),100.,d0z0,covd0z0);
679 if(fConstraint) cutond0z0=kFALSE;
684 AliDebug(1," rejected");
685 delete track; continue;
688 sigmad0 = TMath::Sqrt(covd0z0[0]);
689 maxd0rphi = fNSigma*sigmad0;
690 if(optImpParCut==1) maxd0rphi *= 5.;
691 maxd0rphi = TMath::Min(maxd0rphi,fFiducialR);
692 //sigmad0z0 = TMath::Sqrt(covd0z0[0]+covd0z0[2]);
694 AliDebug(1,Form("trk %d; id %d; |d0| = %f; d0 cut = %f; |z0| = %f; |d0|oplus|z0| = %f; d0z0 cut = %f",i,(Int_t)idOrig[i],TMath::Abs(d0z0[0]),maxd0rphi,TMath::Abs(d0z0[1]),TMath::Sqrt(d0z0[0]*d0z0[0]+d0z0[1]*d0z0[1]),fMaxd0z0));
697 //---- track selection based on impact parameters ----//
699 // always reject tracks outside fiducial volume
700 if(TMath::Abs(d0z0[0])>fFiducialR || TMath::Abs(d0z0[1])>fFiducialZ) {
701 AliDebug(1," rejected");
702 delete track; continue;
705 // during iterations 1 and 2 , reject tracks with d0rphi > maxd0rphi
706 if(optImpParCut>0 && TMath::Abs(d0z0[0])>maxd0rphi) {
707 AliDebug(1," rejected");
708 delete track; continue;
711 // if fConstraint=kFALSE, during iterations 1 and 2 ||
712 // if fConstraint=kTRUE, during iteration 2,
713 // select tracks with d0oplusz0 < fMaxd0z0
714 if((!fConstraint && optImpParCut>0 && fVert.GetNContributors()>0) ||
715 ( fConstraint && optImpParCut==2 && cutond0z0)) {
717 TMath::Sqrt(d0z0[0]*d0z0[0]+d0z0[1]*d0z0[1])>fMaxd0z0) {
718 AliDebug(1," rejected");
719 delete track; continue;
723 // track passed all selections
724 fTrkArraySel.AddLast(track);
725 fIdSel[nTrksSel] = idOrig[i];
727 } // end loop on tracks
733 //----------------------------------------------------------------------------
734 Bool_t AliVertexerTracks::PropagateTrackTo(AliExternalTrackParam *track,
736 //----------------------------------------------------------------
737 // COPIED from AliTracker
739 // Propagates the track to the plane X=xk (cm).
741 // Origin: Marian Ivanov, Marian.Ivanov@cern.ch
742 //----------------------------------------------------------------
744 const Double_t kEpsilon = 0.00001;
745 Double_t xpos = track->GetX();
746 Double_t dir = (xpos<xToGo) ? 1. : -1.;
747 Double_t maxStep = 5;
748 Double_t maxSnp = 0.8;
750 while ( (xToGo-xpos)*dir > kEpsilon){
751 Double_t step = dir*TMath::Min(TMath::Abs(xToGo-xpos), maxStep);
752 Double_t x = xpos+step;
753 Double_t xyz0[3],xyz1[3];
754 track->GetXYZ(xyz0); //starting global position
756 if(!track->GetXYZAt(x,GetFieldkG(),xyz1)) return kFALSE; // no prolongation
757 xyz1[2]+=kEpsilon; // waiting for bug correction in geo
759 if(TMath::Abs(track->GetSnpAt(x,GetFieldkG())) >= maxSnp) return kFALSE;
760 if(!track->PropagateTo(x,GetFieldkG())) return kFALSE;
762 if(TMath::Abs(track->GetSnp()) >= maxSnp) return kFALSE;
763 track->GetXYZ(xyz0); // global position
764 Double_t alphan = TMath::ATan2(xyz0[1], xyz0[0]);
766 Double_t ca=TMath::Cos(alphan-track->GetAlpha()),
767 sa=TMath::Sin(alphan-track->GetAlpha());
768 Double_t sf=track->GetSnp(), cf=TMath::Sqrt((1.-sf)*(1.+sf));
769 Double_t sinNew = sf*ca - cf*sa;
770 if(TMath::Abs(sinNew) >= maxSnp) return kFALSE;
771 if(!track->Rotate(alphan)) return kFALSE;
773 xpos = track->GetX();
777 //---------------------------------------------------------------------------
778 AliESDVertex* AliVertexerTracks::RemoveTracksFromVertex(AliESDVertex *inVtx,
779 const TObjArray *trkArray,
781 const Float_t *diamondxy) const
784 // Removes tracks in trksTree from fit of inVtx
787 if(!strstr(inVtx->GetTitle(),"VertexerTracksWithConstraint")) {
788 printf("ERROR: primary vertex has no constraint: cannot remove tracks");
791 if(!strstr(inVtx->GetTitle(),"VertexerTracksWithConstraintOnlyFitter"))
792 printf("WARNING: result of tracks' removal will be only approximately correct");
795 rv(0,0) = inVtx->GetXv();
796 rv(1,0) = inVtx->GetYv();
797 rv(2,0) = inVtx->GetZv();
800 inVtx->GetCovMatrix(cov);
802 vV(0,1) = cov[1]; vV(1,0) = cov[1];
804 vV(0,2) = cov[3]; vV(2,0) = cov[3];
805 vV(1,2) = cov[4]; vV(2,1) = cov[4];
808 TMatrixD sumWi(TMatrixD::kInverted,vV);
809 TMatrixD sumWiri(sumWi,TMatrixD::kMult,rv);
811 Int_t nUsedTrks = inVtx->GetNIndices();
812 Double_t chi2 = inVtx->GetChi2();
814 AliExternalTrackParam *track = 0;
815 Int_t ntrks = (Int_t)trkArray->GetEntriesFast();
816 for(Int_t i=0;i<ntrks;i++) {
817 track = (AliExternalTrackParam*)trkArray->At(i);
818 if(!inVtx->UsesTrack(id[i])) {
819 printf("track %d was not used in vertex fit",id[i]);
822 Double_t alpha = track->GetAlpha();
823 Double_t xl = diamondxy[0]*TMath::Cos(alpha)+diamondxy[1]*TMath::Sin(alpha);
824 track->PropagateTo(xl,GetFieldkG());
825 // vector of track global coordinates
827 // covariance matrix of ri
830 // get space point from track
831 if(!TrackToPoint(track,ri,wWi)) continue;
833 TMatrixD wWiri(wWi,TMatrixD::kMult,ri);
838 // track contribution to chi2
839 TMatrixD deltar = rv; deltar -= ri;
840 TMatrixD wWideltar(wWi,TMatrixD::kMult,deltar);
841 Double_t chi2i = deltar(0,0)*wWideltar(0,0)+
842 deltar(1,0)*wWideltar(1,0)+
843 deltar(2,0)*wWideltar(2,0);
844 // remove from total chi2
849 printf("Trying to remove too many tracks!");
857 // new inverted of weights matrix
858 TMatrixD invsumWi(TMatrixD::kInverted,sumWi);
860 // new position of primary vertex
861 rvnew.Mult(vVnew,sumWiri);
863 Double_t position[3];
864 position[0] = rvnew(0,0);
865 position[1] = rvnew(1,0);
866 position[2] = rvnew(2,0);
874 // store data in the vertex object
875 AliESDVertex *outVtx = new AliESDVertex(position,cov,chi2,nUsedTrks+1); // the +1 is for the constraint
876 outVtx->SetTitle(inVtx->GetTitle());
877 UShort_t *inindices = inVtx->GetIndices();
878 Int_t nIndices = nUsedTrks;
879 UShort_t *outindices = new UShort_t[nIndices];
881 for(Int_t k=0; k<inVtx->GetNIndices(); k++) {
882 Bool_t copyindex=kTRUE;
883 for(Int_t l=0; l<ntrks; l++) {
884 if(inindices[k]==id[l]) copyindex=kFALSE;
887 outindices[j] = inindices[k]; j++;
890 outVtx->SetIndices(nIndices,outindices);
891 if (outindices) delete [] outindices;
894 printf("Vertex before removing tracks:");
895 inVtx->PrintStatus();
896 inVtx->PrintIndices();
897 printf("Vertex after removing tracks:");
898 outVtx->PrintStatus();
899 outVtx->PrintIndices();
904 //---------------------------------------------------------------------------
905 AliESDVertex* AliVertexerTracks::RemoveConstraintFromVertex(AliESDVertex *inVtx,
907 Float_t *diamondcov) const
910 // Removes diamond constraint from fit of inVtx
913 if(!strstr(inVtx->GetTitle(),"VertexerTracksWithConstraint")) {
914 printf("ERROR: primary vertex has no constraint: cannot remove it\n");
917 if(inVtx->GetNContributors()<3) {
918 printf("ERROR: primary vertex has less than 2 tracks: cannot remove contraint\n");
922 // diamond constraint
924 vVb(0,0) = diamondcov[0];
925 vVb(0,1) = diamondcov[1];
927 vVb(1,0) = diamondcov[1];
928 vVb(1,1) = diamondcov[2];
932 vVb(2,2) = diamondcov[5];
933 TMatrixD vVbInv(TMatrixD::kInverted,vVb);
935 rb(0,0) = diamondxyz[0];
936 rb(1,0) = diamondxyz[1];
937 rb(2,0) = diamondxyz[2];
938 TMatrixD vVbInvrb(vVbInv,TMatrixD::kMult,rb);
942 rv(0,0) = inVtx->GetXv();
943 rv(1,0) = inVtx->GetYv();
944 rv(2,0) = inVtx->GetZv();
947 inVtx->GetCovMatrix(cov);
949 vV(0,1) = cov[1]; vV(1,0) = cov[1];
951 vV(0,2) = cov[3]; vV(2,0) = cov[3];
952 vV(1,2) = cov[4]; vV(2,1) = cov[4];
954 TMatrixD vVInv(TMatrixD::kInverted,vV);
955 TMatrixD vVInvrv(vVInv,TMatrixD::kMult,rv);
958 TMatrixD sumWi = vVInv - vVbInv;
961 TMatrixD sumWiri = vVInvrv - vVbInvrb;
966 // new inverted of weights matrix
967 TMatrixD invsumWi(TMatrixD::kInverted,sumWi);
969 // new position of primary vertex
970 rvnew.Mult(vVnew,sumWiri);
972 Double_t position[3];
973 position[0] = rvnew(0,0);
974 position[1] = rvnew(1,0);
975 position[2] = rvnew(2,0);
984 Double_t chi2 = inVtx->GetChi2();
986 // diamond constribution to chi2
987 TMatrixD deltar = rv; deltar -= rb;
988 TMatrixD vVbInvdeltar(vVbInv,TMatrixD::kMult,deltar);
989 Double_t chi2b = deltar(0,0)*vVbInvdeltar(0,0)+
990 deltar(1,0)*vVbInvdeltar(1,0)+
991 deltar(2,0)*vVbInvdeltar(2,0);
992 // remove from total chi2
995 // store data in the vertex object
996 AliESDVertex *outVtx = new AliESDVertex(position,cov,chi2,inVtx->GetNContributors()-1);
997 outVtx->SetTitle("VertexerTracksNoConstraint");
998 UShort_t *inindices = inVtx->GetIndices();
999 Int_t nIndices = inVtx->GetNIndices();
1000 outVtx->SetIndices(nIndices,inindices);
1004 //---------------------------------------------------------------------------
1005 void AliVertexerTracks::SetCuts(Double_t *cuts, Int_t ncuts)
1010 if (ncuts>0) SetDCAcut(cuts[0]);
1011 if (ncuts>1) SetDCAcutIter0(cuts[1]);
1012 if (ncuts>2) SetMaxd0z0(cuts[2]);
1013 if (ncuts>3) if(fMode==0 && cuts[3]<0) SetITSrefitNotRequired();
1014 if (ncuts>4) SetMinClusters((Int_t)(TMath::Abs(cuts[3])));
1015 if (ncuts>5) SetMinTracks((Int_t)(cuts[4]));
1016 if (ncuts>6) SetNSigmad0(cuts[5]);
1017 if (ncuts>7) SetMinDetFitter(cuts[6]);
1018 if (ncuts>8) SetMaxTgl(cuts[7]);
1019 if (ncuts>9) SetFiducialRZ(cuts[8],cuts[9]);
1020 if (ncuts>10) fAlgo=(Int_t)(cuts[10]);
1021 if (ncuts>11) fAlgoIter0=(Int_t)(cuts[11]);
1023 if (ncuts>12) if (cuts[12]>1.) SetMVTukey2(cuts[12]);
1024 if (ncuts>13) if (cuts[13]>1.) SetMVSig2Ini(cuts[13]);
1025 if (ncuts>14) if (cuts[14]>0.1) SetMVMaxSigma2(cuts[14]);
1026 if (ncuts>15) if (cuts[15]>1e-5) SetMVMinSig2Red(cuts[15]);
1027 if (ncuts>16) if (cuts[16]>1e-5) SetMVMinDst(cuts[16]);
1028 if (ncuts>17) if (cuts[17]>0.5) SetMVScanStep(cuts[17]);
1029 if (ncuts>18) SetMVMaxWghNtr(cuts[18]);
1030 if (ncuts>19) SetMVFinalWBinary(cuts[19]>0);
1031 if (ncuts>20) if (cuts[20]>20.) SetBCSpacing(int(cuts[20]));
1033 if (ncuts>21) if (cuts[21]>0.5) SetUseTrackClusterization(kTRUE);
1034 if (ncuts>22) SetDeltaZCutForCluster(cuts[22]);
1035 if (ncuts>23) SetnSigmaZCutForCluster(cuts[23]);
1037 if (fAlgo==kMultiVertexer || fClusterize) SetSelectOnTOFBunchCrossing(kTRUE,kTRUE);
1038 else SetSelectOnTOFBunchCrossing(kFALSE,kTRUE);
1042 //---------------------------------------------------------------------------
1043 void AliVertexerTracks::SetITSMode(Double_t dcacut,
1044 Double_t dcacutIter0,
1049 Double_t mindetfitter,
1054 Int_t finderAlgoIter0)
1057 // Cut values for ITS mode
1061 SetITSrefitRequired();
1063 SetITSrefitNotRequired();
1066 SetDCAcutIter0(dcacutIter0);
1067 SetMaxd0z0(maxd0z0);
1068 SetMinClusters(TMath::Abs(minCls));
1069 SetMinTracks(mintrks);
1070 SetNSigmad0(nsigma);
1071 SetMinDetFitter(mindetfitter);
1073 SetFiducialRZ(fidR,fidZ);
1075 fAlgoIter0=finderAlgoIter0;
1079 //---------------------------------------------------------------------------
1080 void AliVertexerTracks::SetTPCMode(Double_t dcacut,
1081 Double_t dcacutIter0,
1086 Double_t mindetfitter,
1091 Int_t finderAlgoIter0)
1094 // Cut values for TPC mode
1097 SetITSrefitNotRequired();
1099 SetDCAcutIter0(dcacutIter0);
1100 SetMaxd0z0(maxd0z0);
1101 SetMinClusters(minCls);
1102 SetMinTracks(mintrks);
1103 SetNSigmad0(nsigma);
1104 SetMinDetFitter(mindetfitter);
1106 SetFiducialRZ(fidR,fidZ);
1108 fAlgoIter0=finderAlgoIter0;
1112 //---------------------------------------------------------------------------
1113 void AliVertexerTracks::SetSkipTracks(Int_t n,const Int_t *skipped)
1116 // Mark the tracks not to be used in the vertex reconstruction.
1117 // Tracks are identified by AliESDtrack::GetID()
1119 fNTrksToSkip = n; fTrksToSkip = new Int_t[n];
1120 for(Int_t i=0;i<n;i++) fTrksToSkip[i] = skipped[i];
1123 //---------------------------------------------------------------------------
1124 void AliVertexerTracks::SetVtxStart(AliESDVertex *vtx)
1127 // Set initial vertex knowledge
1129 vtx->GetXYZ(fNominalPos);
1130 vtx->GetCovMatrix(fNominalCov);
1134 //---------------------------------------------------------------------------
1135 void AliVertexerTracks::StrLinVertexFinderMinDist(Int_t optUseWeights)
1137 AliExternalTrackParam *track1;
1138 const Int_t knacc = (Int_t)fTrkArraySel.GetEntriesFast();
1139 AliStrLine **linarray = new AliStrLine* [knacc];
1140 for(Int_t i=0; i<knacc; i++){
1141 track1 = (AliExternalTrackParam*)fTrkArraySel.At(i);
1142 Double_t alpha=track1->GetAlpha();
1143 Double_t mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1];
1144 Double_t pos[3],dir[3],sigmasq[3];
1145 track1->GetXYZAt(mindist,GetFieldkG(),pos);
1146 track1->GetPxPyPzAt(mindist,GetFieldkG(),dir);
1147 sigmasq[0]=TMath::Sin(alpha)*TMath::Sin(alpha)*track1->GetSigmaY2();
1148 sigmasq[1]=TMath::Cos(alpha)*TMath::Cos(alpha)*track1->GetSigmaY2();
1149 sigmasq[2]=track1->GetSigmaZ2();
1152 if(!TrackToPoint(track1,ri,wWi)) {optUseWeights=kFALSE;printf("WARNING\n");}
1155 for(Int_t ia=0;ia<3;ia++){
1156 for(Int_t ib=0;ib<3;ib++){
1157 wmat[iel]=wWi(ia,ib);
1161 linarray[i] = new AliStrLine(pos,sigmasq,wmat,dir);
1163 fVert=TrackletVertexFinder(linarray,knacc,optUseWeights);
1164 for(Int_t i=0; i<knacc; i++) delete linarray[i];
1167 //---------------------------------------------------------------------------
1168 AliESDVertex AliVertexerTracks::TrackletVertexFinder(const TClonesArray *lines, Int_t optUseWeights)
1170 // Calculate the point at minimum distance to prepared tracks (TClonesArray)
1171 const Int_t knacc = (Int_t)lines->GetEntriesFast();
1172 AliStrLine** lines2 = new AliStrLine* [knacc];
1173 for(Int_t i=0; i<knacc; i++){
1174 lines2[i]= (AliStrLine*)lines->At(i);
1176 AliESDVertex vert = TrackletVertexFinder(lines2,knacc,optUseWeights);
1181 //---------------------------------------------------------------------------
1182 AliESDVertex AliVertexerTracks::TrackletVertexFinder(AliStrLine **lines, const Int_t knacc, Int_t optUseWeights)
1184 // Calculate the point at minimum distance to prepared tracks (array of AliStrLine)
1186 Double_t initPos[3]={0.,0.,0.};
1188 Double_t (*vectP0)[3]=new Double_t [knacc][3];
1189 Double_t (*vectP1)[3]=new Double_t [knacc][3];
1192 Double_t dsum[3]={0,0,0};
1193 TMatrixD sumWi(3,3);
1194 for(Int_t i=0;i<3;i++){
1195 for(Int_t j=0;j<3;j++){
1201 for(Int_t i=0; i<knacc; i++){
1202 AliStrLine *line1 = lines[i];
1203 Double_t p0[3],cd[3],sigmasq[3];
1205 if(!line1) {printf("ERROR %d %d\n",i,knacc); continue;}
1208 line1->GetSigma2P0(sigmasq);
1209 line1->GetWMatrix(wmat);
1212 for(Int_t ia=0;ia<3;ia++){
1213 for(Int_t ib=0;ib<3;ib++){
1214 wWi(ia,ib)=wmat[iel];
1221 Double_t p1[3]={p0[0]+cd[0],p0[1]+cd[1],p0[2]+cd[2]};
1229 Double_t matr[3][3];
1231 if(optUseWeights==0)GetStrLinDerivMatrix(p0,p1,matr,dknow);
1232 else GetStrLinDerivMatrix(p0,p1,sigmasq,matr,dknow);
1235 for(Int_t iii=0;iii<3;iii++){
1236 dsum[iii]+=dknow[iii];
1237 for(Int_t lj=0;lj<3;lj++) sum[iii][lj]+=matr[iii][lj];
1241 TMatrixD invsumWi(TMatrixD::kInverted,sumWi);
1242 Double_t covmatrix[6];
1243 covmatrix[0] = invsumWi(0,0);
1244 covmatrix[1] = invsumWi(0,1);
1245 covmatrix[2] = invsumWi(1,1);
1246 covmatrix[3] = invsumWi(0,2);
1247 covmatrix[4] = invsumWi(1,2);
1248 covmatrix[5] = invsumWi(2,2);
1250 Double_t vett[3][3];
1251 Double_t det=GetDeterminant3X3(sum);
1254 if(TMath::Abs(det) > kAlmost0){
1255 for(Int_t zz=0;zz<3;zz++){
1256 for(Int_t ww=0;ww<3;ww++){
1257 for(Int_t kk=0;kk<3;kk++) vett[ww][kk]=sum[ww][kk];
1259 for(Int_t kk=0;kk<3;kk++) vett[kk][zz]=dsum[kk];
1260 initPos[zz]=GetDeterminant3X3(vett)/det;
1264 for(Int_t i=0; i<knacc; i++){
1265 Double_t p0[3]={0,0,0},p1[3]={0,0,0};
1266 for(Int_t ii=0;ii<3;ii++){
1267 p0[ii]=vectP0[i][ii];
1268 p1[ii]=vectP1[i][ii];
1270 sigma+=GetStrLinMinDist(p0,p1,initPos);
1273 if(sigma>0.) {sigma=TMath::Sqrt(sigma);}else{sigma=999;}
1277 AliESDVertex theVert(initPos,covmatrix,99999.,knacc);
1278 theVert.SetDispersion(sigma);
1284 //---------------------------------------------------------------------------
1285 Bool_t AliVertexerTracks::TrackToPoint(AliExternalTrackParam *t,
1286 TMatrixD &ri,TMatrixD &wWi,
1287 Bool_t uUi3by3) const
1290 // Extract from the AliExternalTrackParam the global coordinates ri and covariance matrix
1291 // wWi of the space point that it represents (to be used in VertexFitter())
1295 Double_t rotAngle = t->GetAlpha();
1296 if(rotAngle<0.) rotAngle += 2.*TMath::Pi();
1297 Double_t cosRot = TMath::Cos(rotAngle);
1298 Double_t sinRot = TMath::Sin(rotAngle);
1301 Double_t lambda = TMath::ATan(t->GetTgl());
1302 Double_t cosLam = TMath::Cos(lambda);
1303 Double_t sinLam = TMath::Sin(lambda);
1306 ri(0,0) = t->GetX()*cosRot-t->GetY()*sinRot;
1307 ri(1,0) = t->GetX()*sinRot+t->GetY()*cosRot;
1308 ri(2,0) = t->GetZ();
1311 // matrix to go from global (x,y,z) to local (y,z);
1321 // RS: Added polar inclination
1323 qQi(1,0) = -sinLam*cosRot;
1324 qQi(1,1) = -sinLam*sinRot;
1327 // covariance matrix of local (y,z) - inverted
1329 uUi(0,0) = t->GetSigmaY2();
1330 uUi(0,1) = t->GetSigmaZY();
1331 uUi(1,0) = t->GetSigmaZY();
1332 uUi(1,1) = t->GetSigmaZ2();
1334 //printf(" %f %f",uUi(0,0),uUi(0,1));
1335 //printf(" %f %f",uUi(1,0),uUi(1,1));
1337 if(uUi.Determinant() <= 0.) return kFALSE;
1338 TMatrixD uUiInv(TMatrixD::kInverted,uUi);
1340 // weights matrix: wWi = qQiT * uUiInv * qQi
1341 TMatrixD uUiInvQi(uUiInv,TMatrixD::kMult,qQi);
1342 TMatrixD m(qQi,TMatrixD::kTransposeMult,uUiInvQi);
1345 if(fVert.GetNContributors()<1) AliFatal("Vertex from finder is empty");
1346 // matrix to go from global (x,y,z) to local (x,y,z);
1358 // covariance of fVert along the track
1359 Double_t p[3],pt,ptot;
1361 pt = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
1362 ptot = TMath::Sqrt(pt*pt+p[2]*p[2]);
1363 Double_t cphi = p[0]/pt; //cos(phi)=px/pt
1364 Double_t sphi = p[1]/pt; //sin(phi)=py/pt
1365 Double_t clambda = pt/ptot; //cos(lambda)=pt/ptot
1366 Double_t slambda = p[2]/ptot; //sin(lambda)=pz/ptot
1367 Double_t covfVert[6];
1368 fVert.GetCovMatrix(covfVert);
1369 Double_t covfVertalongt =
1370 covfVert[0]*cphi*cphi*clambda*clambda
1371 +covfVert[1]*2.*cphi*sphi*clambda*clambda
1372 +covfVert[3]*2.*cphi*clambda*slambda
1373 +covfVert[2]*sphi*sphi*clambda*clambda
1374 +covfVert[4]*2.*sphi*clambda*slambda
1375 +covfVert[5]*slambda*slambda;
1376 // covariance matrix of local (x,y,z) - inverted
1378 uUi(0,0) = covfVertalongt * fnSigmaForUi00 * fnSigmaForUi00;
1379 AliDebug(1,Form("=====> sqrtUi00 cm %f",TMath::Sqrt(uUi(0,0))));
1383 uUi(1,1) = t->GetSigmaY2();
1384 uUi(1,2) = t->GetSigmaZY();
1386 uUi(2,1) = t->GetSigmaZY();
1387 uUi(2,2) = t->GetSigmaZ2();
1388 //printf(" Ui :\n");
1389 //printf(" %f %f\n",uUi(0,0),uUi(0,1));
1390 //printf(" %f %f\n",uUi(1,0),uUi(1,1));
1392 if(uUi.Determinant() <= 0.) return kFALSE;
1393 TMatrixD uUiInv(TMatrixD::kInverted,uUi);
1395 // weights matrix: wWi = qQiT * uUiInv * qQi
1396 TMatrixD uUiInvQi(uUiInv,TMatrixD::kMult,qQi);
1397 TMatrixD m(qQi,TMatrixD::kTransposeMult,uUiInvQi);
1404 //---------------------------------------------------------------------------
1405 void AliVertexerTracks::TooFewTracks()
1408 // When the number of tracks is < fMinTracks,
1409 // deal with vertices not found and prepare to exit
1411 AliDebug(1,"TooFewTracks");
1413 Double_t pos[3],err[3];
1414 pos[0] = fNominalPos[0];
1415 err[0] = TMath::Sqrt(fNominalCov[0]);
1416 pos[1] = fNominalPos[1];
1417 err[1] = TMath::Sqrt(fNominalCov[2]);
1418 pos[2] = fNominalPos[2];
1419 err[2] = TMath::Sqrt(fNominalCov[5]);
1420 Int_t ncontr = (err[0]>1. ? -1 : -3);
1421 if(fCurrentVertex) { delete fCurrentVertex; fCurrentVertex=0; }
1422 fCurrentVertex = new AliESDVertex(pos,err);
1423 fCurrentVertex->SetNContributors(ncontr);
1426 fCurrentVertex->SetTitle("VertexerTracksWithConstraint");
1428 fCurrentVertex->SetTitle("VertexerTracksNoConstraint");
1431 if(!fTrkArraySel.IsEmpty()) fTrkArraySel.Delete();
1432 if(fIdSel) {delete [] fIdSel; fIdSel=NULL;}
1433 if(fTrksToSkip) {delete [] fTrksToSkip; fTrksToSkip=NULL;}
1437 //---------------------------------------------------------------------------
1438 void AliVertexerTracks::VertexFinder(Int_t optUseWeights)
1441 // Get estimate of vertex position in (x,y) from tracks DCA
1443 Double_t initPos[3];
1445 for(Int_t i=0;i<2;i++)initPos[i]=fNominalPos[i];
1446 Int_t nacc = (Int_t)fTrkArraySel.GetEntriesFast();
1447 Double_t aver[3]={0.,0.,0.};
1448 Double_t aversq[3]={0.,0.,0.};
1449 Double_t sigmasq[3]={0.,0.,0.};
1452 AliExternalTrackParam *track1;
1453 AliExternalTrackParam *track2;
1454 Double_t pos[3],dir[3];
1455 Double_t alpha,mindist;
1457 for(Int_t i=0; i<nacc; i++){
1458 track1 = (AliExternalTrackParam*)fTrkArraySel.At(i);
1459 alpha=track1->GetAlpha();
1460 mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1];
1461 track1->GetXYZAt(mindist,GetFieldkG(),pos);
1462 track1->GetPxPyPzAt(mindist,GetFieldkG(),dir);
1463 AliStrLine *line1 = new AliStrLine(pos,dir);
1465 // AliStrLine *line1 = new AliStrLine();
1466 // track1->ApproximateHelixWithLine(mindist,GetFieldkG(),line1);
1468 for(Int_t j=i+1; j<nacc; j++){
1469 track2 = (AliExternalTrackParam*)fTrkArraySel.At(j);
1470 alpha=track2->GetAlpha();
1471 mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1];
1472 track2->GetXYZAt(mindist,GetFieldkG(),pos);
1473 track2->GetPxPyPzAt(mindist,GetFieldkG(),dir);
1474 AliStrLine *line2 = new AliStrLine(pos,dir);
1475 // AliStrLine *line2 = new AliStrLine();
1476 // track2->ApproximateHelixWithLine(mindist,GetFieldkG(),line2);
1477 Double_t distCA=line2->GetDCA(line1);
1478 //printf("%d %d %f\n",i,j,distCA);
1479 if(fDCAcut<=0 || (fDCAcut>0&&distCA<fDCAcut)){
1480 Double_t pnt1[3],pnt2[3],crosspoint[3];
1482 if(optUseWeights<=0){
1483 Int_t retcode = line2->Cross(line1,crosspoint);
1486 for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj];
1487 for(Int_t jj=0;jj<3;jj++)aversq[jj]+=(crosspoint[jj]*crosspoint[jj]);
1490 if(optUseWeights>0){
1491 Int_t retcode = line1->CrossPoints(line2,pnt1,pnt2);
1494 alpha=track1->GetAlpha();
1495 cs=TMath::Cos(alpha); sn=TMath::Sin(alpha);
1496 Double_t sx1=sn*sn*track1->GetSigmaY2(), sy1=cs*cs*track1->GetSigmaY2();
1497 alpha=track2->GetAlpha();
1498 cs=TMath::Cos(alpha); sn=TMath::Sin(alpha);
1499 Double_t sx2=sn*sn*track2->GetSigmaY2(), sy2=cs*cs*track2->GetSigmaY2();
1500 Double_t sz1=track1->GetSigmaZ2(), sz2=track2->GetSigmaZ2();
1501 Double_t wx1=sx2/(sx1+sx2), wx2=1.- wx1;
1502 Double_t wy1=sy2/(sy1+sy2), wy2=1.- wy1;
1503 Double_t wz1=sz2/(sz1+sz2), wz2=1.- wz1;
1504 crosspoint[0]=wx1*pnt1[0] + wx2*pnt2[0];
1505 crosspoint[1]=wy1*pnt1[1] + wy2*pnt2[1];
1506 crosspoint[2]=wz1*pnt1[2] + wz2*pnt2[2];
1509 for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj];
1510 for(Int_t jj=0;jj<3;jj++)aversq[jj]+=(crosspoint[jj]*crosspoint[jj]);
1519 for(Int_t jj=0;jj<3;jj++){
1520 initPos[jj] = aver[jj]/ncombi;
1521 //printf("%f\n",initPos[jj]);
1523 sigmasq[jj]=aversq[jj]-initPos[jj]*initPos[jj];
1526 sigma=TMath::Sqrt(TMath::Abs(sigma));
1529 Warning("VertexFinder","Finder did not succed");
1532 fVert.SetXYZ(initPos);
1533 fVert.SetDispersion(sigma);
1534 fVert.SetNContributors(ncombi);
1536 //---------------------------------------------------------------------------
1537 void AliVertexerTracks::VertexFitter(Bool_t vfit, Bool_t chiCalc,Int_t useWeights)
1540 // The optimal estimate of the vertex position is given by a "weighted
1541 // average of tracks positions".
1542 // Original method: V. Karimaki, CMS Note 97/0051
1544 const double kTiny = 1e-9;
1545 Bool_t useConstraint = fConstraint;
1546 Double_t initPos[3];
1548 fVert.GetXYZ(initPos);
1550 initPos[0]=fNominalPos[0];
1551 initPos[1]=fNominalPos[1];
1552 initPos[2]=fNominalPos[2];
1555 Int_t nTrksSel = (Int_t)fTrkArraySel.GetEntries();
1556 if(nTrksSel==1) useConstraint=kTRUE;
1557 AliDebug(1,Form("--- VertexFitter(): start (%d,%d,%d)",vfit,chiCalc,useWeights));
1558 AliDebug(1,Form(" Number of tracks in array: %d\n",nTrksSel));
1559 AliDebug(1,Form(" Minimum # tracks required in fit: %d\n",fMinTracks));
1560 AliDebug(1,Form(" Vertex position after finder: %f,%f,%f\n",initPos[0],initPos[1],initPos[2]));
1561 if(useConstraint) AliDebug(1,Form(" This vertex will be used in fit: (%f+-%f,%f+-%f)\n",fNominalPos[0],TMath::Sqrt(fNominalCov[0]),fNominalPos[1],TMath::Sqrt(fNominalCov[2])));
1563 // special treatment for few-tracks fits (e.g. secondary vertices)
1564 Bool_t uUi3by3 = kFALSE; if(nTrksSel<5 && !useConstraint && !useWeights) uUi3by3 = kTRUE;
1567 static TMatrixD rv(3,1);
1568 static TMatrixD vV(3,3);
1569 rv(0,0) = initPos[0];
1570 rv(1,0) = initPos[1];
1571 rv(2,0) = initPos[2];
1572 Double_t xlStart,alpha;
1573 Int_t nTrksUsed = 0;
1574 Double_t chi2=0,chi2i,chi2b;
1575 AliExternalTrackParam *t = 0;
1578 // initial vertex covariance matrix
1580 vVb(0,0) = fNominalCov[0];
1581 vVb(0,1) = fNominalCov[1];
1583 vVb(1,0) = fNominalCov[1];
1584 vVb(1,1) = fNominalCov[2];
1588 vVb(2,2) = fNominalCov[5];
1589 TMatrixD vVbInv(TMatrixD::kInverted,vVb);
1591 rb(0,0) = fNominalPos[0];
1592 rb(1,0) = fNominalPos[1];
1593 rb(2,0) = fNominalPos[2];
1594 TMatrixD vVbInvrb(vVbInv,TMatrixD::kMult,rb);
1596 int currBC = fVert.GetBC();
1599 // 1st - estimate of vtx using all tracks
1600 // 2nd - estimate of global chi2
1602 for(step=0; step<2; step++) {
1603 if (step==0 && !vfit) continue;
1604 else if (step==1 && !chiCalc) continue;
1607 fMVWSum = fMVWE2 = 0;
1608 if(step==1) { initPos[0]=rv(0,0); initPos[1]=rv(1,0); initPos[2]=rv(2,0);}
1609 AliDebug(2,Form("Step%d: inipos: %+f %+f %+f MinTr: %d, Sig2:%.2f)",step,initPos[0],initPos[1],initPos[2],fMinTracks,fMVSigma2));
1611 TMatrixD sumWiri(3,1);
1612 TMatrixD sumWi(3,3);
1613 for(i=0; i<3; i++) {
1615 for(j=0; j<3; j++) sumWi(j,i) = 0.;
1618 // mean vertex constraint
1621 sumWiri(i,0) += vVbInvrb(i,0);
1622 for(k=0;k<3;k++) sumWi(i,k) += vVbInv(i,k);
1625 TMatrixD deltar = rv; deltar -= rb;
1626 TMatrixD vVbInvdeltar(vVbInv,TMatrixD::kMult,deltar);
1627 chi2b = deltar(0,0)*vVbInvdeltar(0,0)+
1628 deltar(1,0)*vVbInvdeltar(1,0)+
1629 deltar(2,0)*vVbInvdeltar(2,0);
1634 for(k=0; k<nTrksSel; k++) {
1636 // get track from track array
1637 t = (AliExternalTrackParam*)fTrkArraySel.At(k);
1638 if (useWeights && t->TestBit(kBitUsed)) continue;
1640 int tBC = int(t->GetUniqueID()) - kTOFBCShift; // BC assigned to this track
1641 if (fSelectOnTOFBunchCrossing) {
1642 if (!fKeepAlsoUnflaggedTOFBunchCrossing) continue; // don't consider tracks with undefined BC
1643 if (currBC!=AliVTrack::kTOFBCNA && tBC!=AliVTrack::kTOFBCNA && tBC!=currBC) continue; // track does not match to current BCid
1645 alpha = t->GetAlpha();
1646 xlStart = initPos[0]*TMath::Cos(alpha)+initPos[1]*TMath::Sin(alpha);
1647 // to vtxSeed (from finder)
1648 t->PropagateTo(xlStart,GetFieldkG());
1650 // vector of track global coordinates
1652 // covariance matrix of ri
1655 // get space point from track
1656 if(!TrackToPoint(t,ri,wWi,uUi3by3)) continue;
1659 TMatrixD deltar = rv; deltar -= ri;
1660 TMatrixD wWideltar(wWi,TMatrixD::kMult,deltar);
1661 chi2i = deltar(0,0)*wWideltar(0,0)+
1662 deltar(1,0)*wWideltar(1,0)+
1663 deltar(2,0)*wWideltar(2,0);
1666 //double sg = TMath::Sqrt(fMVSigma2);
1667 //double chi2iw = (deltar(0,0)*wWideltar(0,0)+deltar(1,0)*wWideltar(1,0))/sg + deltar(2,0)*wWideltar(2,0)/fMVSigma2;
1668 //double wgh = (1-chi2iw/fMVTukey2);
1669 double chi2iw = chi2i;
1670 double wgh = (1-chi2iw/fMVTukey2/fMVSigma2);
1672 if (wgh<kTiny) wgh = 0;
1673 else if (useWeights==2) wgh = 1.; // use as binary weight
1674 if (step==1) ((AliESDtrack*)t)->SetBit(kBitUsed, wgh>0);
1675 if (wgh<kTiny) continue; // discard the track
1676 wWi *= wgh; // RS: use weight?
1678 fMVWE2 += wgh*chi2iw;
1680 // add to total chi2
1681 if (fSelectOnTOFBunchCrossing && tBC!=AliVTrack::kTOFBCNA && currBC<0) currBC = tBC;
1684 TMatrixD wWiri(wWi,TMatrixD::kMult,ri);
1689 } // end loop on tracks
1691 if(nTrksUsed < fMinTracks) {
1696 Double_t determinant = sumWi.Determinant();
1697 if(determinant < fMinDetFitter) {
1698 AliDebug(1,Form("det(V) = %f (<%f)\n",determinant,fMinDetFitter));
1704 // inverted of weights matrix
1705 TMatrixD invsumWi(TMatrixD::kInverted,sumWi);
1707 // position of primary vertex
1708 rv.Mult(vV,sumWiri);
1710 } // end loop on the 2 steps
1713 fVert.SetNContributors(-1);
1716 if (fCurrentVertex) fVert = *fCurrentVertex; // RS
1721 Double_t position[3];
1722 position[0] = rv(0,0);
1723 position[1] = rv(1,0);
1724 position[2] = rv(2,0);
1725 Double_t covmatrix[6];
1726 covmatrix[0] = vV(0,0);
1727 covmatrix[1] = vV(0,1);
1728 covmatrix[2] = vV(1,1);
1729 covmatrix[3] = vV(0,2);
1730 covmatrix[4] = vV(1,2);
1731 covmatrix[5] = vV(2,2);
1733 // for correct chi2/ndf, count constraint as additional "track"
1734 if(fConstraint) nTrksUsed++;
1736 if (vfit && !chiCalc) { // RS: special mode for multi-vertex finder
1737 fVert.SetXYZ(position);
1738 fVert.SetCovarianceMatrix(covmatrix);
1739 fVert.SetNContributors(nTrksUsed);
1742 // store data in the vertex object
1743 if(fCurrentVertex) { delete fCurrentVertex; fCurrentVertex=0; }
1744 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nTrksUsed);
1745 fCurrentVertex->SetBC(currBC);
1746 fVert = *fCurrentVertex; // RS
1747 AliDebug(1," Vertex after fit:");
1748 AliDebug(1,Form("xyz: %f %f %f; nc %d",fCurrentVertex->GetXv(),fCurrentVertex->GetYv(),fCurrentVertex->GetZv(),fCurrentVertex->GetNContributors()));
1749 AliDebug(1,"--- VertexFitter(): finish\n");
1754 //----------------------------------------------------------------------------
1755 AliESDVertex* AliVertexerTracks::VertexForSelectedTracks(const TObjArray *trkArray,
1757 Bool_t optUseFitter,
1758 Bool_t optPropagate,
1759 Bool_t optUseDiamondConstraint)
1762 // Return vertex from tracks (AliExternalTrackParam) in array
1765 // set optUseDiamondConstraint=TRUE only if you are reconstructing the
1767 if(optUseDiamondConstraint) {
1773 // get tracks and propagate them to initial vertex position
1774 fIdSel = new UShort_t[(Int_t)trkArray->GetEntriesFast()];
1775 Int_t nTrksSel = PrepareTracks(*trkArray,id,0);
1776 if((!optUseDiamondConstraint && nTrksSel<TMath::Max(2,fMinTracks)) ||
1777 (optUseDiamondConstraint && nTrksSel<1)) {
1779 return fCurrentVertex;
1784 AliDebug(1,"Just one track");
1785 OneTrackVertFinder();
1788 case 1: StrLinVertexFinderMinDist(1); break;
1789 case 2: StrLinVertexFinderMinDist(0); break;
1790 case 3: HelixVertexFinder(); break;
1791 case 4: VertexFinder(1); break;
1792 case 5: VertexFinder(0); break;
1793 default: printf("Wrong algorithm\n"); break;
1796 AliDebug(1," Vertex finding completed\n");
1802 Double_t position[3]={fVert.GetXv(),fVert.GetYv(),fVert.GetZv()};
1803 Double_t covmatrix[6];
1804 fVert.GetCovMatrix(covmatrix);
1805 Double_t chi2=99999.;
1806 Int_t nTrksUsed=fVert.GetNContributors();
1807 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nTrksUsed);
1809 fCurrentVertex->SetDispersion(fVert.GetDispersion());
1812 // set indices of used tracks and propagate track to found vertex
1813 UShort_t *indices = 0;
1814 Double_t d0z0[2],covd0z0[3];
1815 AliExternalTrackParam *t = 0;
1816 if(fCurrentVertex->GetNContributors()>0) {
1817 indices = new UShort_t[fTrkArraySel.GetEntriesFast()];
1818 for(Int_t jj=0; jj<(Int_t)fTrkArraySel.GetEntriesFast(); jj++) {
1819 indices[jj] = fIdSel[jj];
1820 t = (AliExternalTrackParam*)fTrkArraySel.At(jj);
1821 if(optPropagate && optUseFitter) {
1822 if(TMath::Sqrt(fCurrentVertex->GetXv()*fCurrentVertex->GetXv()+fCurrentVertex->GetYv()*fCurrentVertex->GetYv())<3.) {
1823 t->PropagateToDCA(fCurrentVertex,GetFieldkG(),100.,d0z0,covd0z0);
1824 AliDebug(1,Form("Track %d propagated to found vertex",jj));
1826 AliWarning("Found vertex outside beam pipe!");
1830 fCurrentVertex->SetIndices(fCurrentVertex->GetNContributors(),indices);
1834 if (indices) {delete [] indices; indices=NULL;}
1835 delete [] fIdSel; fIdSel=NULL;
1836 fTrkArraySel.Delete();
1838 return fCurrentVertex;
1841 //----------------------------------------------------------------------------
1842 AliESDVertex* AliVertexerTracks::VertexForSelectedESDTracks(TObjArray *trkArray,
1843 Bool_t optUseFitter,
1844 Bool_t optPropagate,
1845 Bool_t optUseDiamondConstraint)
1849 // Return vertex from array of ESD tracks
1852 Int_t nTrks = (Int_t)trkArray->GetEntriesFast();
1853 UShort_t *id = new UShort_t[nTrks];
1855 AliESDtrack *esdt = 0;
1856 for(Int_t i=0; i<nTrks; i++){
1857 esdt = (AliESDtrack*)trkArray->At(i);
1858 id[i] = (UShort_t)esdt->GetID();
1861 VertexForSelectedTracks(trkArray,id,optUseFitter,optPropagate,optUseDiamondConstraint);
1863 delete [] id; id=NULL;
1865 return fCurrentVertex;
1868 //______________________________________________________
1869 Bool_t AliVertexerTracks::FindNextVertexMV()
1871 // try to find a new vertex
1872 fMVSigma2 = fMVSig2Ini;
1873 double prevSig2 = fMVSigma2;
1874 double minDst2 = fMVMinDst*fMVMinDst;
1875 const double kSigLimit = 1.0;
1876 const double kSigLimitE = kSigLimit+1e-6;
1877 const double kPushFactor = 0.5;
1878 const int kMaxIter = 20;
1879 double push = kPushFactor;
1882 double posP[3]={0,0,0},pos[3]={0,0,0};
1887 fVert.SetBC(AliVTrack::kTOFBCNA);
1888 VertexFitter(kTRUE,kFALSE,1);
1889 if (fVert.GetNContributors()<fMinTracks) {
1890 AliDebug(3,Form("Failed in iteration %d: No Contributirs",iter));
1893 if (fMVWSum>0) fMVSigma2 = TMath::Max(fMVWE2/fMVWSum,kSigLimit);
1895 AliDebug(3,Form("Failed %d, no weithgs",iter));
1900 double sigRed = (prevSig2-fMVSigma2)/prevSig2; // reduction of sigma2
1903 double dst2 = (pos[0]-posP[0])*(pos[0]-posP[0])+(pos[1]-posP[1])*(pos[1]-posP[1])+(pos[2]-posP[2])*(pos[2]-posP[2]);
1904 AliDebug(3,Form("It#%2d Vtx: %+f %+f %+f Dst:%f Sig: %f [%.2f/%.2f] SigRed:%f",iter,pos[0],pos[1],pos[2],TMath::Sqrt(dst2),fMVSigma2,fMVWE2,fMVWSum,sigRed));
1905 if ( (++iter<kMaxIter) && (sigRed<0 || sigRed<fMVMinSig2Red) && fMVSigma2>fMVMaxSigma2) {
1906 fMVSigma2 *= push; // stuck, push little bit
1907 push *= kPushFactor;
1908 if (fMVSigma2<1.) fMVSigma2 = 1.;
1909 AliDebug(3,Form("Pushed sigma2 to %f",fMVSigma2));
1911 else if (dst2<minDst2 && ((sigRed<0 || sigRed<fMVMinSig2Red) || fMVSigma2<kSigLimitE)) break;
1913 fVert.GetXYZ(posP); // fetch previous vertex position
1914 prevSig2 = fMVSigma2;
1915 } while(iter<kMaxIter);
1917 if (fVert.GetNContributors()<0 || iter>kMaxIter || fMVSigma2>fMVMaxSigma2) {
1921 VertexFitter(kFALSE,kTRUE,fMVFinalWBinary ? 2:1); // final chi2 calculation
1922 int nv = fMVVertices->GetEntries();
1924 int ntrk = fTrkArraySel.GetEntries();
1925 int nindices = fCurrentVertex->GetNContributors() - (fConstraint ? 1:0);
1926 UShort_t *indices = 0;
1927 if (nindices>0) indices = new UShort_t[nindices];
1929 for (int itr=0;itr<ntrk;itr++) {
1930 AliExternalTrackParam* t = (AliExternalTrackParam*)fTrkArraySel[itr];
1931 if (t->TestBit(kBitAccounted) || !t->TestBit(kBitUsed)) continue; // already belongs to some vertex
1932 t->SetBit(kBitAccounted);
1933 indices[nadded++] = fIdSel[itr];
1935 if (nadded!=nindices) printf("Mismatch : NInd: %d Nadd: %d\n",nindices,nadded);
1936 fCurrentVertex->SetIndices(nindices,indices);
1938 TString title="VertexerTracksMVNoConstraint";
1939 if(fConstraint) title="VertexerTracksMVWithConstraint";
1940 fCurrentVertex->SetTitle(title.Data());
1941 fMVVertices->AddLast(fCurrentVertex);
1942 AliDebug(3,Form("Added new vertex #%d NCont:%d XYZ: %f %f %f",nindices,nv,fCurrentVertex->GetX(),fCurrentVertex->GetY(),fCurrentVertex->GetZ()));
1943 if (indices) delete[] indices;
1944 fCurrentVertex = 0; // already attached to fMVVertices
1949 //______________________________________________________
1950 void AliVertexerTracks::FindVerticesMV()
1952 // find and fit multiple vertices
1954 double step = fMVScanStep>1 ? fMVScanStep : 1.;
1955 double zmx = 3*TMath::Sqrt(fNominalCov[5]);
1957 int nz = TMath::Nint((zmx-zmn)/step); if (nz<1) nz=1;
1958 double dz = (zmx-zmn)/nz;
1960 AliDebug(2,Form("%d seeds between %f and %f",nz,zmn+dz/2,zmx+dz/2));
1962 if (!fMVVertices) fMVVertices = new TObjArray(10);
1963 fMVVertices->Clear();
1965 int ntrLeft = (Int_t)fTrkArraySel.GetEntries();
1967 double sig2Scan = fMVSig2Ini;
1968 Bool_t runMore = kTRUE;
1971 fMVSig2Ini = sig2Scan*1e3; // try wide search
1972 Bool_t found = kFALSE;
1974 fVert.SetNContributors(-1);
1975 fVert.SetXYZ(fNominalPos);
1976 AliDebug(3,Form("Wide search #%d Z= %f Sigma2=%f",cntWide,fNominalPos[2],fMVSig2Ini));
1977 if (FindNextVertexMV()) { // are there tracks left to consider?
1978 AliESDVertex* vtLast = (AliESDVertex*)fMVVertices->Last();
1979 if (vtLast && vtLast->GetNContributors()>0) ntrLeft -= vtLast->GetNContributors()-(fConstraint ? 1:0);
1980 if (ntrLeft<1) runMore = kFALSE;
1984 // if nothing is found, do narrow sig2ini scan
1985 fMVSig2Ini = sig2Scan;
1986 for (;izStart<nz;izStart++) {
1987 double zSeed = zmn+dz*(izStart+0.5);
1988 AliDebug(3,Form("Seed %d: Z= %f Sigma2=%f",izStart,zSeed,fMVSig2Ini));
1989 fVert.SetNContributors(-1);
1990 fVert.SetXYZ(fNominalPos);
1992 if (FindNextVertexMV()) { // are there tracks left to consider?
1993 AliESDVertex* vtLast = (AliESDVertex*)fMVVertices->Last();
1994 if (vtLast && vtLast->GetNContributors()>0) ntrLeft -= vtLast->GetNContributors()-(fConstraint ? 1:0);
1995 if (ntrLeft<1) runMore = kFALSE;
2000 runMore = found; // if nothing was found, no need for new iteration
2002 fMVSig2Ini = sig2Scan;
2003 int nvFound = fMVVertices->GetEntriesFast();
2004 AliDebug(2,Form("Number of found vertices: %d",nvFound));
2005 if (nvFound<1) TooFewTracks();
2006 if (AliLog::GetGlobalDebugLevel()>0) fMVVertices->Print();
2010 //______________________________________________________
2011 void AliVertexerTracks::AnalyzePileUp(AliESDEvent* esdEv)
2013 // if multiple vertices are found, try to find the primary one and attach it as fCurrentVertex
2014 // then attach pile-up vertices directly to esdEv
2016 int nFND = (fMVVertices && fMVVertices->GetEntriesFast()) ? fMVVertices->GetEntriesFast() : 0;
2017 if (nFND<1) { if (!fCurrentVertex) TooFewTracks(); return;} // no multiple vertices
2021 for (int iv=0;iv<nFND;iv++) {
2022 AliESDVertex* fnd = (AliESDVertex*)fMVVertices->At(iv);
2024 nIndx[iv] = fnd->GetNIndices();
2026 TMath::Sort(nFND, nIndx, indCont, kTRUE); // sort in decreasing order of Nindices
2028 int distOrd[nFND],indx[nFND];
2029 for (int iv=0;iv<nFND;iv++) {
2030 AliESDVertex* fndI = (AliESDVertex*)fMVVertices->At(indCont[iv]);
2031 if (fndI->GetStatus()<1) continue; // discarded
2033 for (int jv=iv+1;jv<nFND;jv++) {
2034 AliESDVertex* fndJ = (AliESDVertex*)fMVVertices->At(indCont[jv]);
2035 if (fndJ->GetStatus()<1) continue;
2036 dists[ncomp] = fndI->GetWDist(fndJ)*fndJ->GetNIndices();
2037 distOrd[ncomp] = indCont[jv];
2038 indx[ncomp] = ncomp;
2041 if (ncomp<1) continue;
2042 TMath::Sort(ncomp, dists, indx, kFALSE); // sort in increasing distance order
2043 for (int jv0=0;jv0<ncomp;jv0++) {
2044 int jv = distOrd[indx[jv0]];
2045 AliESDVertex* fndJ = (AliESDVertex*)fMVVertices->At(jv);
2046 if (dists[indx[jv0]]<fMVMaxWghNtr) { // candidate for split vertex
2047 //before eliminating the small close vertex, check if we should transfere its BC to largest one
2048 if (fndJ->GetBC()!=AliVTrack::kTOFBCNA && fndI->GetBC()==AliVTrack::kTOFBCNA) fndI->SetBC(fndJ->GetBC());
2050 // leave the vertex only if both vertices have definit but different BC's, then this is not splitting.
2051 if ( (fndJ->GetBC()==fndI->GetBC()) || (fndJ->GetBC()==AliVTrack::kTOFBCNA)) fndJ->SetNContributors(-fndJ->GetNContributors());
2056 // select as a primary the largest vertex with BC=0, or the largest with BC non-ID
2057 int primBC0=-1,primNoBC=-1;
2058 for (int iv0=0;iv0<nFND;iv0++) {
2059 int iv = indCont[iv0];
2060 AliESDVertex* fndI = (AliESDVertex*)fMVVertices->At(iv);
2061 if (!fndI) continue;
2062 if (fndI->GetStatus()<1) {fMVVertices->RemoveAt(iv); delete fndI; continue;}
2063 if (primBC0<0 && fndI->GetBC()==0) primBC0 = iv;
2064 if (primNoBC<0 && fndI->GetBC()==AliVTrack::kTOFBCNA) primNoBC = iv;
2067 if (primBC0>=0) fCurrentVertex = (AliESDVertex*)fMVVertices->At(primBC0);
2068 if (!fCurrentVertex && primNoBC>=0) fCurrentVertex = (AliESDVertex*)fMVVertices->At(primNoBC);
2069 if (fCurrentVertex) fMVVertices->Remove(fCurrentVertex);
2070 else { // all vertices have BC>0, no primary vertex
2071 fCurrentVertex = new AliESDVertex();
2072 fCurrentVertex->SetNContributors(-3);
2073 fCurrentVertex->SetBC(AliVTrack::kTOFBCNA);
2075 fCurrentVertex->SetID(-1);
2077 // add pileup vertices
2079 for (int iv0=0;iv0<nFND;iv0++) {
2080 int iv = indCont[iv0];
2081 AliESDVertex* fndI = (AliESDVertex*)fMVVertices->At(iv);
2082 if (!fndI) continue;
2083 fndI->SetID(++nadd);
2084 esdEv->AddPileupVertexTracks(fndI);
2087 fMVVertices->Delete();
2091 //______________________________________________________
2092 void AliVertexerTracks::FindAllVertices(Int_t nTrksOrig,
2093 const TObjArray *trkArrayOrig,
2098 // clusterize tracks using z coordinates of intersection with beam axis
2099 // and compute all vertices
2101 UShort_t* posOrig=new UShort_t[nTrksOrig];
2102 for(Int_t iTr=0; iTr<nTrksOrig; iTr++) posOrig[iTr]=iTr;
2105 // sort points along Z
2106 AliDebug(1,Form("Sort points along Z, used tracks %d",nTrksOrig));
2107 for(Int_t iTr1=0; iTr1<nTrksOrig; iTr1++){
2108 for(Int_t iTr2=iTr1+1; iTr2<nTrksOrig; iTr2++){
2109 if(zTr[iTr1]>zTr[iTr2]){
2110 Double_t tmpz=zTr[iTr2];
2111 Double_t tmperr=err2zTr[iTr2];
2112 UShort_t tmppos=posOrig[iTr2];
2113 UShort_t tmpid=idOrig[iTr2];
2114 zTr[iTr2]=zTr[iTr1];
2115 err2zTr[iTr2]=err2zTr[iTr1];
2116 posOrig[iTr2]=posOrig[iTr1];
2117 idOrig[iTr2]=idOrig[iTr1];
2119 err2zTr[iTr1]=tmperr;
2121 posOrig[iTr1]=tmppos;
2128 Int_t* firstTr=new Int_t[nTrksOrig];
2129 Int_t* lastTr=new Int_t[nTrksOrig];
2132 for(Int_t iTr=0; iTr<nTrksOrig-1; iTr++){
2133 Double_t distz=zTr[iTr+1]-zTr[iTr];
2134 Double_t errdistz=TMath::Sqrt(err2zTr[iTr+1]+err2zTr[iTr]);
2135 if(errdistz<=0.000001) errdistz=0.000001;
2136 if(distz>fDeltaZCutForCluster || (distz/errdistz)>fnSigmaZCutForCluster){
2137 lastTr[nClusters]=iTr;
2138 firstTr[nClusters+1]=iTr+1;
2142 lastTr[nClusters]=nTrksOrig-1;
2145 AliDebug(1,Form("Number of found clusters %d",nClusters+1));
2146 Int_t nFoundVertices=0;
2148 if (!fMVVertices) fMVVertices = new TObjArray(nClusters+1);
2150 fMVVertices->Clear();
2151 TObjArray cluTrackArr(nTrksOrig);
2152 UShort_t *idTrkClu=new UShort_t[nTrksOrig];
2153 // Int_t maxContr=0;
2156 for(Int_t iClu=0; iClu<=nClusters; iClu++){
2157 Int_t nCluTracks=lastTr[iClu]-firstTr[iClu]+1;
2158 cluTrackArr.Clear();
2159 AliDebug(1,Form(" Vertex #%d tracks %d first tr %d last track %d",iClu,nCluTracks,firstTr[iClu],lastTr[iClu]));
2161 for(Int_t iTr=firstTr[iClu]; iTr<=lastTr[iClu]; iTr++){
2162 AliExternalTrackParam* t=(AliExternalTrackParam*)trkArrayOrig->At(posOrig[iTr]);
2163 if(TMath::Abs(t->GetZ()-zTr[iTr])>0.00001){
2164 AliError(Form("Clu %d Track %d zTrack=%f zVec=%f\n",iClu,iTr,t->GetZ(),zTr[iTr]));
2166 cluTrackArr.AddAt(t,nSelTr);
2167 idTrkClu[nSelTr]=idOrig[iTr];
2168 AliDebug(1,Form(" Add track %d: id %d, z=%f",iTr,idOrig[iTr],zTr[iTr]));
2171 AliESDVertex* vert=FindPrimaryVertex(&cluTrackArr,idTrkClu);
2172 AliDebug(1,Form("Found vertex in z=%f with %d contributors",vert->GetZv(),
2173 vert->GetNContributors()));
2176 if(vert->GetNContributors()>0){
2178 fMVVertices->AddLast(vert);
2180 // if(vert->GetNContributors()>maxContr){
2181 // maxContr=vert->GetNContributors();
2182 // maxPos=nFoundVertices-1;
2186 AliDebug(1,Form("Number of found vertices %d (%d)",nFoundVertices,fMVVertices->GetEntriesFast()));
2187 // if(maxPos>=0 && maxContr>0){
2188 // AliESDVertex* vtxMax=(AliESDVertex*)fMVVertices->At(maxPos);
2189 // if(fCurrentVertex) delete fCurrentVertex;
2190 // fCurrentVertex=new AliESDVertex(*vtxMax);