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),
92 // Default constructor
97 //----------------------------------------------------------------------------
98 AliVertexerTracks::AliVertexerTracks(Double_t fieldkG):
125 fSelectOnTOFBunchCrossing(kFALSE),
126 fKeepAlsoUnflaggedTOFBunchCrossing(kTRUE),
133 fMVMinSig2Red(0.005),
137 fMVFinalWBinary(kTRUE),
142 // Standard constructor
147 //-----------------------------------------------------------------------------
148 AliVertexerTracks::~AliVertexerTracks()
150 // Default Destructor
151 // The objects pointed by the following pointer are not owned
152 // by this class and are not deleted
154 if(fTrksToSkip) { delete [] fTrksToSkip; fTrksToSkip=NULL; fNTrksToSkip=0;}
155 if(fIdSel) { delete [] fIdSel; fIdSel=NULL; }
156 if(fMVVertices) delete fMVVertices;
159 //----------------------------------------------------------------------------
160 AliESDVertex* AliVertexerTracks::FindPrimaryVertex(const AliVEvent *vEvent)
163 // Primary vertex for current ESD or AOD event
165 // 1st with 5*fNSigma*sigma cut w.r.t. to initial vertex
166 // + cut on sqrt(d0d0+z0z0) if fConstraint=kFALSE
167 // 2nd with fNSigma*sigma cut w.r.t. to vertex found in 1st iteration)
170 TString evtype = vEvent->IsA()->GetName();
171 Bool_t inputAOD = ((evtype=="AliAODEvent") ? kTRUE : kFALSE);
173 if(inputAOD && fMode==1) {
174 printf("Error : AliVertexerTracks: no TPC-only vertex from AOD\n");
176 return fCurrentVertex;
179 // accept 1-track case only if constraint is available
180 if(!fConstraint && fMinTracks==1) fMinTracks=2;
182 // read tracks from AlivEvent
183 Int_t nTrks = (Int_t)vEvent->GetNumberOfTracks();
184 if(nTrks<fMinTracks) {
186 return fCurrentVertex;
189 int bcRound = fBCSpacing/25; // profit from larger than 25ns spacing and set correct BC
190 TDirectory * olddir = gDirectory;
192 if(nTrks>500) f = new TFile("VertexerTracks.root","recreate");
193 TObjArray trkArrayOrig(nTrks);
194 UShort_t *idOrig = new UShort_t[nTrks];
197 AliExternalTrackParam *t=0;
199 for(Int_t i=0; i<nTrks; i++) {
200 AliVTrack *track = (AliVTrack*)vEvent->GetTrack(i);
201 // check tracks to skip
202 Bool_t skipThis = kFALSE;
203 for(Int_t j=0; j<fNTrksToSkip; j++) {
204 if(track->GetID()==fTrksToSkip[j]) {
205 AliDebug(1,Form("skipping track: %d",i));
209 if(skipThis) continue;
211 // skip pure ITS SA tracks (default)
212 if(!fITSpureSA && (track->GetStatus()&AliESDtrack::kITSpureSA)) continue;
213 // or use only pure ITS SA tracks
214 if(fITSpureSA && !(track->GetStatus()&AliESDtrack::kITSpureSA)) continue;
217 if(fMode==0 && fITSrefit && !(track->GetStatus()&AliESDtrack::kITSrefit)) continue;
219 if(!inputAOD) { // ESD
220 AliESDtrack* esdt = (AliESDtrack*)track;
221 if(esdt->GetNcls(fMode) < fMinClusters) continue;
222 if(fMode==0) { // ITS mode
223 Double_t x,p[5],cov[15];
224 esdt->GetExternalParameters(x,p);
225 esdt->GetExternalCovariance(cov);
226 t = new AliExternalTrackParam(x,esdt->GetAlpha(),p,cov);
227 } else if(fMode==1) { // TPC mode
228 t = (AliExternalTrackParam*)esdt->GetTPCInnerParam();
230 Double_t radius = 2.8; //something less than the beam pipe radius
231 if(!PropagateTrackTo(t,radius)) continue;
233 } else { // AOD (only ITS mode)
235 for(Int_t l=0;l<6;l++) if(TESTBIT(track->GetITSClusterMap(),l)) ncls0++;
236 if(ncls0 < fMinClusters) continue;
237 t = new AliExternalTrackParam(track);
240 // use TOF info about bunch crossing
241 if(fSelectOnTOFBunchCrossing) {
242 int bc = track->GetTOFBunchCrossing(fFieldkG);
243 if (bc>AliVTrack::kTOFBCNA) bc /= bcRound;
244 t->SetUniqueID(UInt_t(bc + kTOFBCShift));
247 trkArrayOrig.AddLast(t);
248 idOrig[nTrksOrig]=(UShort_t)track->GetID();
250 } // end loop on tracks
252 // call method that will reconstruct the vertex
253 FindPrimaryVertex(&trkArrayOrig,idOrig);
255 if(!inputAOD) AnalyzePileUp((AliESDEvent*)vEvent);
257 if(fMode==0) trkArrayOrig.Delete();
258 delete [] idOrig; idOrig=NULL;
261 f->Close(); delete f; f = NULL;
262 gSystem->Unlink("VertexerTracks.root");
266 // set vertex ID for tracks used in the fit
268 if(!inputAOD && fCurrentVertex) {
269 Int_t nIndices = fCurrentVertex->GetNIndices();
270 UShort_t *indices = fCurrentVertex->GetIndices();
271 for(Int_t ind=0; ind<nIndices; ind++) {
272 AliESDtrack *esdt = (AliESDtrack*)vEvent->GetTrack(indices[ind]);
273 esdt->SetVertexID(-1);
277 return fCurrentVertex;
279 //----------------------------------------------------------------------------
280 AliESDVertex* AliVertexerTracks::FindPrimaryVertex(const TObjArray *trkArrayOrig,
284 // Primary vertex using the AliExternalTrackParam's in the TObjArray.
285 // idOrig must contain the track IDs from AliESDtrack::GetID()
287 // 1st with 5*fNSigma*sigma cut w.r.t. to initial vertex
288 // + cut on sqrt(d0d0+z0z0) if fConstraint=kFALSE
289 // 2nd with fNSigma*sigma cut w.r.t. to vertex found in 1st iteration)
292 // accept 1-track case only if constraint is available
293 if(!fConstraint && fMinTracks==1) fMinTracks=2;
295 // read tracks from array
296 Int_t nTrksOrig = (Int_t)trkArrayOrig->GetEntriesFast();
297 AliDebug(1,Form("Initial number of tracks: %d",nTrksOrig));
298 if(nTrksOrig<fMinTracks) {
299 AliDebug(1,"TooFewTracks");
301 return fCurrentVertex;
304 // If fConstraint=kFALSE
305 // run VertexFinder(1) to get rough estimate of initVertex (x,y)
307 // fill fTrkArraySel, for VertexFinder()
308 fIdSel = new UShort_t[nTrksOrig];
309 PrepareTracks(*trkArrayOrig,idOrig,0);
310 if(fIdSel) { delete [] fIdSel; fIdSel=NULL; }
311 Double_t cutsave = fDCAcut;
312 fDCAcut = fDCAcutIter0;
314 switch (fAlgoIter0) {
315 case 1: StrLinVertexFinderMinDist(1); break;
316 case 2: StrLinVertexFinderMinDist(0); break;
317 case 3: HelixVertexFinder(); break;
318 case 4: VertexFinder(1); break;
319 case 5: VertexFinder(0); break;
320 default: printf("Wrong algorithm\n"); break;
323 if(fVert.GetNContributors()>0) {
324 fVert.GetXYZ(fNominalPos);
325 fNominalPos[0] = fVert.GetXv();
326 fNominalPos[1] = fVert.GetYv();
327 fNominalPos[2] = fVert.GetZv();
328 AliDebug(1,Form("No mean vertex: VertexFinder gives (%f, %f, %f)",fNominalPos[0],fNominalPos[1],fNominalPos[2]));
333 AliDebug(1,"No mean vertex and VertexFinder failed");
340 // propagate tracks to fNominalPos vertex
342 // if(constraint) reject for |d0|>5*fNSigma*sigma w.r.t. fNominal... vertex
343 // else reject for |d0|\oplus|z0| > 5 mm w.r.t. fNominal... vertex
345 // propagate tracks to best between initVertex and fCurrentVertex
346 // preselect tracks (reject for |d0|>fNSigma*sigma w.r.t. best
347 // between initVertex and fCurrentVertex)
348 Bool_t multiMode = kFALSE;
349 for(Int_t iter=1; iter<=2; iter++) {
350 if (fAlgo==kMultiVertexer && iter==2) break; // multivertexer does not need 2 iterations
351 if(fOnlyFitter && iter==1) continue;
352 if(fIdSel) { delete [] fIdSel; fIdSel=NULL; }
353 fIdSel = new UShort_t[nTrksOrig];
354 Int_t nTrksSel = PrepareTracks(*trkArrayOrig,idOrig,iter);
355 AliDebug(1,Form("N tracks selected in iteration %d: %d",iter,nTrksSel));
356 if(nTrksSel < fMinTracks) {
358 return fCurrentVertex;
363 if(nTrksSel==1 && fAlgo!=kMultiVertexer) {
364 AliDebug(1,"Just one track");
365 OneTrackVertFinder();
368 case kStrLinVertexFinderMinDist1: StrLinVertexFinderMinDist(1); break;
369 case kStrLinVertexFinderMinDist0: StrLinVertexFinderMinDist(0); break;
370 case kHelixVertexFinder : HelixVertexFinder(); break;
371 case kVertexFinder1 : VertexFinder(1); break;
372 case kVertexFinder0 : VertexFinder(0); break;
373 case kMultiVertexer : FindVerticesMV(); multiMode = kTRUE; break;
374 default: printf("Wrong algorithm"); break;
377 AliDebug(1," Vertex finding completed");
379 if (multiMode) break; // // multivertexer does not need 2nd iteration
382 } // end loop on the two iterations
384 if (!multiMode || fMVVertices->GetEntries()==0) { // in multi-vertex mode this is already done for found vertices
385 // set indices of used tracks
386 UShort_t *indices = 0;
387 if(fCurrentVertex->GetNContributors()>0) {
388 Int_t nIndices = (Int_t)fTrkArraySel.GetEntriesFast();
389 indices = new UShort_t[nIndices];
390 for(Int_t jj=0; jj<nIndices; jj++)
391 indices[jj] = fIdSel[jj];
392 fCurrentVertex->SetIndices(nIndices,indices);
394 if (indices) {delete [] indices; indices=NULL;}
397 TString title="VertexerTracksNoConstraint";
399 title="VertexerTracksWithConstraint";
400 if(fOnlyFitter) title.Append("OnlyFitter");
402 fCurrentVertex->SetTitle(title.Data());
404 AliDebug(1,Form("xyz: %f %f %f; nc %d",fCurrentVertex->GetXv(),fCurrentVertex->GetYv(),fCurrentVertex->GetZv(),fCurrentVertex->GetNContributors()));
407 delete [] fIdSel; fIdSel=NULL;
408 fTrkArraySel.Delete();
409 if(fTrksToSkip) { delete [] fTrksToSkip; fTrksToSkip=NULL; }
412 return fCurrentVertex;
414 //------------------------------------------------------------------------
415 Double_t AliVertexerTracks::GetDeterminant3X3(Double_t matr[][3])
418 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];
421 //-------------------------------------------------------------------------
422 void AliVertexerTracks::GetStrLinDerivMatrix(const Double_t *p0,const Double_t *p1,Double_t (*m)[3],Double_t *d)
425 Double_t x12=p0[0]-p1[0];
426 Double_t y12=p0[1]-p1[1];
427 Double_t z12=p0[2]-p1[2];
428 Double_t kk=x12*x12+y12*y12+z12*z12;
429 m[0][0]=2-2/kk*x12*x12;
430 m[0][1]=-2/kk*x12*y12;
431 m[0][2]=-2/kk*x12*z12;
432 m[1][0]=-2/kk*x12*y12;
433 m[1][1]=2-2/kk*y12*y12;
434 m[1][2]=-2/kk*y12*z12;
435 m[2][0]=-2/kk*x12*z12;
437 m[2][2]=2-2/kk*z12*z12;
438 d[0]=2*p0[0]-2/kk*p0[0]*x12*x12-2/kk*p0[2]*x12*z12-2/kk*p0[1]*x12*y12;
439 d[1]=2*p0[1]-2/kk*p0[1]*y12*y12-2/kk*p0[0]*x12*y12-2/kk*p0[2]*z12*y12;
440 d[2]=2*p0[2]-2/kk*p0[2]*z12*z12-2/kk*p0[0]*x12*z12-2/kk*p0[1]*z12*y12;
443 //--------------------------------------------------------------------------
444 void AliVertexerTracks::GetStrLinDerivMatrix(const Double_t *p0,const Double_t *p1,const Double_t *sigmasq,Double_t (*m)[3],Double_t *d)
447 Double_t x12=p1[0]-p0[0];
448 Double_t y12=p1[1]-p0[1];
449 Double_t z12=p1[2]-p0[2];
451 Double_t den= x12*x12*sigmasq[1]*sigmasq[2]+y12*y12*sigmasq[0]*sigmasq[2]+z12*z12*sigmasq[0]*sigmasq[1];
453 Double_t kk= 2*(x12*x12/sigmasq[0]+y12*y12/sigmasq[1]+z12*z12/sigmasq[2]);
456 cc[0]=-x12/sigmasq[0];
457 cc[1]=-y12/sigmasq[1];
458 cc[2]=-z12/sigmasq[2];
460 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;
462 Double_t ss= -p0[0]*cc[0]-p0[1]*cc[1]-p0[2]*cc[2];
465 aa[0]=x12*sigmasq[1]*sigmasq[2]/den;
466 aa[1]=y12*sigmasq[0]*sigmasq[2]/den;
467 aa[2]=z12*sigmasq[0]*sigmasq[1]/den;
469 m[0][0]=aa[0]*(aa[0]*kk+2*cc[0])+2*cc[0]*aa[0]+2/sigmasq[0];
470 m[0][1]=aa[1]*(aa[0]*kk+2*cc[0])+2*cc[1]*aa[0];
471 m[0][2]=aa[2]*(aa[0]*kk+2*cc[0])+2*cc[2]*aa[0];
473 m[1][0]=aa[0]*(aa[1]*kk+2*cc[1])+2*cc[0]*aa[1];
474 m[1][1]=aa[1]*(aa[1]*kk+2*cc[1])+2*cc[1]*aa[1]+2/sigmasq[1];
475 m[1][2]=aa[2]*(aa[1]*kk+2*cc[1])+2*cc[2]*aa[1];
477 m[2][0]=aa[0]*(aa[2]*kk+2*cc[2])+2*cc[0]*aa[2];
478 m[2][1]=aa[1]*(aa[2]*kk+2*cc[2])+2*cc[1]*aa[2];
479 m[2][2]=aa[2]*(aa[2]*kk+2*cc[2])+2*cc[2]*aa[2]+2/sigmasq[2];
481 d[0]=-ww*(aa[0]*kk+2*cc[0])-2*ss*aa[0]+2*p0[0]/sigmasq[0];
482 d[1]=-ww*(aa[1]*kk+2*cc[1])-2*ss*aa[1]+2*p0[1]/sigmasq[1];
483 d[2]=-ww*(aa[2]*kk+2*cc[2])-2*ss*aa[2]+2*p0[2]/sigmasq[2];
486 //--------------------------------------------------------------------------
487 Double_t AliVertexerTracks::GetStrLinMinDist(const Double_t *p0,const Double_t *p1,const Double_t *x0)
490 Double_t x12=p0[0]-p1[0];
491 Double_t y12=p0[1]-p1[1];
492 Double_t z12=p0[2]-p1[2];
493 Double_t x10=p0[0]-x0[0];
494 Double_t y10=p0[1]-x0[1];
495 Double_t z10=p0[2]-x0[2];
496 // 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);
497 return ((y10*z12-z10*y12)*(y10*z12-z10*y12)+
498 (z10*x12-x10*z12)*(z10*x12-x10*z12)+
499 (x10*y12-y10*x12)*(x10*y12-y10*x12))
500 /(x12*x12+y12*y12+z12*z12);
502 //---------------------------------------------------------------------------
503 void AliVertexerTracks::OneTrackVertFinder()
505 // find vertex for events with 1 track, using DCA to nominal beam axis
506 AliDebug(1,Form("Number of prepared tracks =%d - Call OneTrackVertFinder",fTrkArraySel.GetEntries()));
507 AliExternalTrackParam *track1;
508 track1 = (AliExternalTrackParam*)fTrkArraySel.At(0);
509 Double_t alpha=track1->GetAlpha();
510 Double_t mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1];
511 Double_t pos[3],dir[3];
512 track1->GetXYZAt(mindist,GetFieldkG(),pos);
513 track1->GetPxPyPzAt(mindist,GetFieldkG(),dir);
514 AliStrLine *line1 = new AliStrLine(pos,dir);
515 Double_t p1[3]={fNominalPos[0],fNominalPos[1],0.};
516 Double_t p2[3]={fNominalPos[0],fNominalPos[1],10.};
517 AliStrLine *zeta=new AliStrLine(p1,p2,kTRUE);
518 Double_t crosspoint[3]={0.,0.,0.};
521 Int_t retcode = zeta->Cross(line1,crosspoint);
523 sigma=line1->GetDistFromPoint(crosspoint);
528 fVert.SetXYZ(crosspoint);
529 fVert.SetDispersion(sigma);
530 fVert.SetNContributors(nContrib);
532 //---------------------------------------------------------------------------
533 void AliVertexerTracks::HelixVertexFinder()
535 // Get estimate of vertex position in (x,y) from tracks DCA
540 for(Int_t i=0;i<2;i++)initPos[i]=fNominalPos[i];
542 Int_t nacc = (Int_t)fTrkArraySel.GetEntriesFast();
544 Double_t aver[3]={0.,0.,0.};
545 Double_t averquad[3]={0.,0.,0.};
546 Double_t sigmaquad[3]={0.,0.,0.};
549 AliExternalTrackParam *track1;
550 AliExternalTrackParam *track2;
553 Double_t alpha, cs, sn;
554 Double_t crosspoint[3];
555 for(Int_t i=0; i<nacc; i++){
556 track1 = (AliExternalTrackParam*)fTrkArraySel.At(i);
559 for(Int_t j=i+1; j<nacc; j++){
560 track2 = (AliExternalTrackParam*)fTrkArraySel.At(j);
562 distCA=track2->PropagateToDCA(track1,GetFieldkG());
563 if(fDCAcut<=0 ||(fDCAcut>0&&distCA<fDCAcut)){
565 alpha=track1->GetAlpha();
566 cs=TMath::Cos(alpha); sn=TMath::Sin(alpha);
567 Double_t x1=x*cs - track1->GetY()*sn;
568 Double_t y1=x*sn + track1->GetY()*cs;
569 Double_t z1=track1->GetZ();
571 Double_t sx1=sn*sn*track1->GetSigmaY2(), sy1=cs*cs*track1->GetSigmaY2();
573 alpha=track2->GetAlpha();
574 cs=TMath::Cos(alpha); sn=TMath::Sin(alpha);
575 Double_t x2=x*cs - track2->GetY()*sn;
576 Double_t y2=x*sn + track2->GetY()*cs;
577 Double_t z2=track2->GetZ();
578 Double_t sx2=sn*sn*track2->GetSigmaY2(), sy2=cs*cs*track2->GetSigmaY2();
579 Double_t sz1=track1->GetSigmaZ2(), sz2=track2->GetSigmaZ2();
580 Double_t wx1=sx2/(sx1+sx2), wx2=1.- wx1;
581 Double_t wy1=sy2/(sy1+sy2), wy2=1.- wy1;
582 Double_t wz1=sz2/(sz1+sz2), wz2=1.- wz1;
583 crosspoint[0]=wx1*x1 + wx2*x2;
584 crosspoint[1]=wy1*y1 + wy2*y2;
585 crosspoint[2]=wz1*z1 + wz2*z2;
588 for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj];
589 for(Int_t jj=0;jj<3;jj++)averquad[jj]+=(crosspoint[jj]*crosspoint[jj]);
595 for(Int_t jj=0;jj<3;jj++){
596 initPos[jj] = aver[jj]/ncombi;
597 averquad[jj]/=ncombi;
598 sigmaquad[jj]=averquad[jj]-initPos[jj]*initPos[jj];
599 sigma+=sigmaquad[jj];
601 sigma=TMath::Sqrt(TMath::Abs(sigma));
604 Warning("HelixVertexFinder","Finder did not succed");
607 fVert.SetXYZ(initPos);
608 fVert.SetDispersion(sigma);
609 fVert.SetNContributors(ncombi);
611 //----------------------------------------------------------------------------
612 Int_t AliVertexerTracks::PrepareTracks(const TObjArray &trkArrayOrig,
613 const UShort_t *idOrig,
617 // Propagate tracks to initial vertex position and store them in a TObjArray
619 AliDebug(1," PrepareTracks()");
621 Int_t nTrksOrig = (Int_t)trkArrayOrig.GetEntriesFast();
624 Double_t sigmaCurr[3];
625 Double_t normdistx,normdisty;
626 Double_t d0z0[2],covd0z0[3];
629 AliESDVertex *initVertex = new AliESDVertex(fNominalPos,fNominalCov,1,1);
631 if(!fTrkArraySel.IsEmpty()) fTrkArraySel.Delete();
633 AliExternalTrackParam *track=0;
636 for(Int_t i=0; i<nTrksOrig; i++) {
637 AliExternalTrackParam *trackOrig=(AliExternalTrackParam*)trkArrayOrig.At(i);
638 if(trackOrig->Charge()!=0) { // normal tracks
639 track = new AliExternalTrackParam(*(AliExternalTrackParam*)trkArrayOrig.At(i));
640 } else { // neutral tracks (from a V0)
641 track = new AliNeutralTrackParam(*(AliNeutralTrackParam*)trkArrayOrig.At(i));
643 track->SetUniqueID(trackOrig->GetUniqueID());
645 if(TMath::Abs(track->GetTgl())>fMaxTgl) {
646 AliDebug(1,Form(" rejecting track with tgl = %f",track->GetTgl()));
647 delete track; continue;
650 Bool_t propagateOK = kFALSE, cutond0z0 = kTRUE;
651 // propagate track to vertex
652 if(optImpParCut<2 || fOnlyFitter) { // optImpParCut==1 or 0
653 propagateOK = track->PropagateToDCA(initVertex,GetFieldkG(),100.,d0z0,covd0z0);
654 } else { // optImpParCut==2
655 fCurrentVertex->GetSigmaXYZ(sigmaCurr);
656 normdistx = TMath::Abs(fCurrentVertex->GetXv()-fNominalPos[0])/TMath::Sqrt(sigmaCurr[0]*sigmaCurr[0]+fNominalCov[0]);
657 normdisty = TMath::Abs(fCurrentVertex->GetYv()-fNominalPos[1])/TMath::Sqrt(sigmaCurr[1]*sigmaCurr[1]+fNominalCov[2]);
658 AliDebug(1,Form("normdistx %f %f %f",fCurrentVertex->GetXv(),fNominalPos[0],TMath::Sqrt(sigmaCurr[0]*sigmaCurr[0]+fNominalCov[0])));
659 AliDebug(1,Form("normdisty %f %f %f",fCurrentVertex->GetYv(),fNominalPos[1],TMath::Sqrt(sigmaCurr[1]*sigmaCurr[1]+fNominalCov[2])));
660 AliDebug(1,Form("sigmaCurr %f %f %f",sigmaCurr[0],sigmaCurr[1],TMath::Sqrt(fNominalCov[0])+TMath::Sqrt(fNominalCov[2])));
661 if(normdistx < 3. && normdisty < 3. &&
662 (sigmaCurr[0]+sigmaCurr[1])<(TMath::Sqrt(fNominalCov[0])+TMath::Sqrt(fNominalCov[2]))) {
663 propagateOK = track->PropagateToDCA(fCurrentVertex,GetFieldkG(),100.,d0z0,covd0z0);
665 propagateOK = track->PropagateToDCA(initVertex,GetFieldkG(),100.,d0z0,covd0z0);
666 if(fConstraint) cutond0z0=kFALSE;
671 AliDebug(1," rejected");
672 delete track; continue;
675 sigmad0 = TMath::Sqrt(covd0z0[0]);
676 maxd0rphi = fNSigma*sigmad0;
677 if(optImpParCut==1) maxd0rphi *= 5.;
678 maxd0rphi = TMath::Min(maxd0rphi,fFiducialR);
679 //sigmad0z0 = TMath::Sqrt(covd0z0[0]+covd0z0[2]);
681 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));
684 //---- track selection based on impact parameters ----//
686 // always reject tracks outside fiducial volume
687 if(TMath::Abs(d0z0[0])>fFiducialR || TMath::Abs(d0z0[1])>fFiducialZ) {
688 AliDebug(1," rejected");
689 delete track; continue;
692 // during iterations 1 and 2 , reject tracks with d0rphi > maxd0rphi
693 if(optImpParCut>0 && TMath::Abs(d0z0[0])>maxd0rphi) {
694 AliDebug(1," rejected");
695 delete track; continue;
698 // if fConstraint=kFALSE, during iterations 1 and 2 ||
699 // if fConstraint=kTRUE, during iteration 2,
700 // select tracks with d0oplusz0 < fMaxd0z0
701 if((!fConstraint && optImpParCut>0 && fVert.GetNContributors()>0) ||
702 ( fConstraint && optImpParCut==2 && cutond0z0)) {
704 TMath::Sqrt(d0z0[0]*d0z0[0]+d0z0[1]*d0z0[1])>fMaxd0z0) {
705 AliDebug(1," rejected");
706 delete track; continue;
710 // track passed all selections
711 fTrkArraySel.AddLast(track);
712 fIdSel[nTrksSel] = idOrig[i];
714 } // end loop on tracks
720 //----------------------------------------------------------------------------
721 Bool_t AliVertexerTracks::PropagateTrackTo(AliExternalTrackParam *track,
723 //----------------------------------------------------------------
724 // COPIED from AliTracker
726 // Propagates the track to the plane X=xk (cm).
728 // Origin: Marian Ivanov, Marian.Ivanov@cern.ch
729 //----------------------------------------------------------------
731 const Double_t kEpsilon = 0.00001;
732 Double_t xpos = track->GetX();
733 Double_t dir = (xpos<xToGo) ? 1. : -1.;
734 Double_t maxStep = 5;
735 Double_t maxSnp = 0.8;
737 while ( (xToGo-xpos)*dir > kEpsilon){
738 Double_t step = dir*TMath::Min(TMath::Abs(xToGo-xpos), maxStep);
739 Double_t x = xpos+step;
740 Double_t xyz0[3],xyz1[3];
741 track->GetXYZ(xyz0); //starting global position
743 if(!track->GetXYZAt(x,GetFieldkG(),xyz1)) return kFALSE; // no prolongation
744 xyz1[2]+=kEpsilon; // waiting for bug correction in geo
746 if(TMath::Abs(track->GetSnpAt(x,GetFieldkG())) >= maxSnp) return kFALSE;
747 if(!track->PropagateTo(x,GetFieldkG())) return kFALSE;
749 if(TMath::Abs(track->GetSnp()) >= maxSnp) return kFALSE;
750 track->GetXYZ(xyz0); // global position
751 Double_t alphan = TMath::ATan2(xyz0[1], xyz0[0]);
753 Double_t ca=TMath::Cos(alphan-track->GetAlpha()),
754 sa=TMath::Sin(alphan-track->GetAlpha());
755 Double_t sf=track->GetSnp(), cf=TMath::Sqrt((1.-sf)*(1.+sf));
756 Double_t sinNew = sf*ca - cf*sa;
757 if(TMath::Abs(sinNew) >= maxSnp) return kFALSE;
758 if(!track->Rotate(alphan)) return kFALSE;
760 xpos = track->GetX();
764 //---------------------------------------------------------------------------
765 AliESDVertex* AliVertexerTracks::RemoveTracksFromVertex(AliESDVertex *inVtx,
766 const TObjArray *trkArray,
768 const Float_t *diamondxy) const
771 // Removes tracks in trksTree from fit of inVtx
774 if(!strstr(inVtx->GetTitle(),"VertexerTracksWithConstraint")) {
775 printf("ERROR: primary vertex has no constraint: cannot remove tracks");
778 if(!strstr(inVtx->GetTitle(),"VertexerTracksWithConstraintOnlyFitter"))
779 printf("WARNING: result of tracks' removal will be only approximately correct");
782 rv(0,0) = inVtx->GetXv();
783 rv(1,0) = inVtx->GetYv();
784 rv(2,0) = inVtx->GetZv();
787 inVtx->GetCovMatrix(cov);
789 vV(0,1) = cov[1]; vV(1,0) = cov[1];
791 vV(0,2) = cov[3]; vV(2,0) = cov[3];
792 vV(1,2) = cov[4]; vV(2,1) = cov[4];
795 TMatrixD sumWi(TMatrixD::kInverted,vV);
796 TMatrixD sumWiri(sumWi,TMatrixD::kMult,rv);
798 Int_t nUsedTrks = inVtx->GetNIndices();
799 Double_t chi2 = inVtx->GetChi2();
801 AliExternalTrackParam *track = 0;
802 Int_t ntrks = (Int_t)trkArray->GetEntriesFast();
803 for(Int_t i=0;i<ntrks;i++) {
804 track = (AliExternalTrackParam*)trkArray->At(i);
805 if(!inVtx->UsesTrack(id[i])) {
806 printf("track %d was not used in vertex fit",id[i]);
809 Double_t alpha = track->GetAlpha();
810 Double_t xl = diamondxy[0]*TMath::Cos(alpha)+diamondxy[1]*TMath::Sin(alpha);
811 track->PropagateTo(xl,GetFieldkG());
812 // vector of track global coordinates
814 // covariance matrix of ri
817 // get space point from track
818 if(!TrackToPoint(track,ri,wWi)) continue;
820 TMatrixD wWiri(wWi,TMatrixD::kMult,ri);
825 // track contribution to chi2
826 TMatrixD deltar = rv; deltar -= ri;
827 TMatrixD wWideltar(wWi,TMatrixD::kMult,deltar);
828 Double_t chi2i = deltar(0,0)*wWideltar(0,0)+
829 deltar(1,0)*wWideltar(1,0)+
830 deltar(2,0)*wWideltar(2,0);
831 // remove from total chi2
836 printf("Trying to remove too many tracks!");
844 // new inverted of weights matrix
845 TMatrixD invsumWi(TMatrixD::kInverted,sumWi);
847 // new position of primary vertex
848 rvnew.Mult(vVnew,sumWiri);
850 Double_t position[3];
851 position[0] = rvnew(0,0);
852 position[1] = rvnew(1,0);
853 position[2] = rvnew(2,0);
861 // store data in the vertex object
862 AliESDVertex *outVtx = new AliESDVertex(position,cov,chi2,nUsedTrks+1); // the +1 is for the constraint
863 outVtx->SetTitle(inVtx->GetTitle());
864 UShort_t *inindices = inVtx->GetIndices();
865 Int_t nIndices = nUsedTrks;
866 UShort_t *outindices = new UShort_t[nIndices];
868 for(Int_t k=0; k<inVtx->GetNIndices(); k++) {
869 Bool_t copyindex=kTRUE;
870 for(Int_t l=0; l<ntrks; l++) {
871 if(inindices[k]==id[l]) copyindex=kFALSE;
874 outindices[j] = inindices[k]; j++;
877 outVtx->SetIndices(nIndices,outindices);
878 if (outindices) delete [] outindices;
881 printf("Vertex before removing tracks:");
882 inVtx->PrintStatus();
883 inVtx->PrintIndices();
884 printf("Vertex after removing tracks:");
885 outVtx->PrintStatus();
886 outVtx->PrintIndices();
891 //---------------------------------------------------------------------------
892 AliESDVertex* AliVertexerTracks::RemoveConstraintFromVertex(AliESDVertex *inVtx,
894 Float_t *diamondcov) const
897 // Removes diamond constraint from fit of inVtx
900 if(!strstr(inVtx->GetTitle(),"VertexerTracksWithConstraint")) {
901 printf("ERROR: primary vertex has no constraint: cannot remove it\n");
904 if(inVtx->GetNContributors()<3) {
905 printf("ERROR: primary vertex has less than 2 tracks: cannot remove contraint\n");
909 // diamond constraint
911 vVb(0,0) = diamondcov[0];
912 vVb(0,1) = diamondcov[1];
914 vVb(1,0) = diamondcov[1];
915 vVb(1,1) = diamondcov[2];
919 vVb(2,2) = diamondcov[5];
920 TMatrixD vVbInv(TMatrixD::kInverted,vVb);
922 rb(0,0) = diamondxyz[0];
923 rb(1,0) = diamondxyz[1];
924 rb(2,0) = diamondxyz[2];
925 TMatrixD vVbInvrb(vVbInv,TMatrixD::kMult,rb);
929 rv(0,0) = inVtx->GetXv();
930 rv(1,0) = inVtx->GetYv();
931 rv(2,0) = inVtx->GetZv();
934 inVtx->GetCovMatrix(cov);
936 vV(0,1) = cov[1]; vV(1,0) = cov[1];
938 vV(0,2) = cov[3]; vV(2,0) = cov[3];
939 vV(1,2) = cov[4]; vV(2,1) = cov[4];
941 TMatrixD vVInv(TMatrixD::kInverted,vV);
942 TMatrixD vVInvrv(vVInv,TMatrixD::kMult,rv);
945 TMatrixD sumWi = vVInv - vVbInv;
948 TMatrixD sumWiri = vVInvrv - vVbInvrb;
953 // new inverted of weights matrix
954 TMatrixD invsumWi(TMatrixD::kInverted,sumWi);
956 // new position of primary vertex
957 rvnew.Mult(vVnew,sumWiri);
959 Double_t position[3];
960 position[0] = rvnew(0,0);
961 position[1] = rvnew(1,0);
962 position[2] = rvnew(2,0);
971 Double_t chi2 = inVtx->GetChi2();
973 // diamond constribution to chi2
974 TMatrixD deltar = rv; deltar -= rb;
975 TMatrixD vVbInvdeltar(vVbInv,TMatrixD::kMult,deltar);
976 Double_t chi2b = deltar(0,0)*vVbInvdeltar(0,0)+
977 deltar(1,0)*vVbInvdeltar(1,0)+
978 deltar(2,0)*vVbInvdeltar(2,0);
979 // remove from total chi2
982 // store data in the vertex object
983 AliESDVertex *outVtx = new AliESDVertex(position,cov,chi2,inVtx->GetNContributors()-1);
984 outVtx->SetTitle("VertexerTracksNoConstraint");
985 UShort_t *inindices = inVtx->GetIndices();
986 Int_t nIndices = inVtx->GetNIndices();
987 outVtx->SetIndices(nIndices,inindices);
991 //---------------------------------------------------------------------------
992 void AliVertexerTracks::SetCuts(Double_t *cuts, Int_t ncuts)
997 if (ncuts>0) SetDCAcut(cuts[0]);
998 if (ncuts>1) SetDCAcutIter0(cuts[1]);
999 if (ncuts>2) SetMaxd0z0(cuts[2]);
1000 if (ncuts>3) if(fMode==0 && cuts[3]<0) SetITSrefitNotRequired();
1001 if (ncuts>4) SetMinClusters((Int_t)(TMath::Abs(cuts[3])));
1002 if (ncuts>5) SetMinTracks((Int_t)(cuts[4]));
1003 if (ncuts>6) SetNSigmad0(cuts[5]);
1004 if (ncuts>7) SetMinDetFitter(cuts[6]);
1005 if (ncuts>8) SetMaxTgl(cuts[7]);
1006 if (ncuts>9) SetFiducialRZ(cuts[8],cuts[9]);
1007 if (ncuts>10) fAlgo=(Int_t)(cuts[10]);
1008 if (ncuts>11) fAlgoIter0=(Int_t)(cuts[11]);
1010 if (ncuts>12) if (cuts[12]>1.) SetMVTukey2(cuts[12]);
1011 if (ncuts>13) if (cuts[13]>1.) SetMVSig2Ini(cuts[13]);
1012 if (ncuts>14) if (cuts[14]>0.1) SetMVMaxSigma2(cuts[14]);
1013 if (ncuts>15) if (cuts[15]>1e-5) SetMVMinSig2Red(cuts[15]);
1014 if (ncuts>16) if (cuts[16]>1e-5) SetMVMinDst(cuts[16]);
1015 if (ncuts>17) if (cuts[17]>0.5) SetMVScanStep(cuts[17]);
1016 if (ncuts>18) SetMVMaxWghNtr(cuts[18]);
1017 if (ncuts>19) SetMVFinalWBinary(cuts[19]>0);
1018 if (ncuts>20) if (cuts[20]>20.) SetBCSpacing(int(cuts[20]));
1021 if (fAlgo==kMultiVertexer) SetSelectOnTOFBunchCrossing(kTRUE,kTRUE);
1022 else SetSelectOnTOFBunchCrossing(kFALSE,kTRUE);
1026 //---------------------------------------------------------------------------
1027 void AliVertexerTracks::SetITSMode(Double_t dcacut,
1028 Double_t dcacutIter0,
1033 Double_t mindetfitter,
1038 Int_t finderAlgoIter0)
1041 // Cut values for ITS mode
1045 SetITSrefitRequired();
1047 SetITSrefitNotRequired();
1050 SetDCAcutIter0(dcacutIter0);
1051 SetMaxd0z0(maxd0z0);
1052 SetMinClusters(TMath::Abs(minCls));
1053 SetMinTracks(mintrks);
1054 SetNSigmad0(nsigma);
1055 SetMinDetFitter(mindetfitter);
1057 SetFiducialRZ(fidR,fidZ);
1059 fAlgoIter0=finderAlgoIter0;
1063 //---------------------------------------------------------------------------
1064 void AliVertexerTracks::SetTPCMode(Double_t dcacut,
1065 Double_t dcacutIter0,
1070 Double_t mindetfitter,
1075 Int_t finderAlgoIter0)
1078 // Cut values for TPC mode
1081 SetITSrefitNotRequired();
1083 SetDCAcutIter0(dcacutIter0);
1084 SetMaxd0z0(maxd0z0);
1085 SetMinClusters(minCls);
1086 SetMinTracks(mintrks);
1087 SetNSigmad0(nsigma);
1088 SetMinDetFitter(mindetfitter);
1090 SetFiducialRZ(fidR,fidZ);
1092 fAlgoIter0=finderAlgoIter0;
1096 //---------------------------------------------------------------------------
1097 void AliVertexerTracks::SetSkipTracks(Int_t n,const Int_t *skipped)
1100 // Mark the tracks not to be used in the vertex reconstruction.
1101 // Tracks are identified by AliESDtrack::GetID()
1103 fNTrksToSkip = n; fTrksToSkip = new Int_t[n];
1104 for(Int_t i=0;i<n;i++) fTrksToSkip[i] = skipped[i];
1107 //---------------------------------------------------------------------------
1108 void AliVertexerTracks::SetVtxStart(AliESDVertex *vtx)
1111 // Set initial vertex knowledge
1113 vtx->GetXYZ(fNominalPos);
1114 vtx->GetCovMatrix(fNominalCov);
1118 //---------------------------------------------------------------------------
1119 void AliVertexerTracks::StrLinVertexFinderMinDist(Int_t optUseWeights)
1121 AliExternalTrackParam *track1;
1122 const Int_t knacc = (Int_t)fTrkArraySel.GetEntriesFast();
1123 AliStrLine **linarray = new AliStrLine* [knacc];
1124 for(Int_t i=0; i<knacc; i++){
1125 track1 = (AliExternalTrackParam*)fTrkArraySel.At(i);
1126 Double_t alpha=track1->GetAlpha();
1127 Double_t mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1];
1128 Double_t pos[3],dir[3],sigmasq[3];
1129 track1->GetXYZAt(mindist,GetFieldkG(),pos);
1130 track1->GetPxPyPzAt(mindist,GetFieldkG(),dir);
1131 sigmasq[0]=TMath::Sin(alpha)*TMath::Sin(alpha)*track1->GetSigmaY2();
1132 sigmasq[1]=TMath::Cos(alpha)*TMath::Cos(alpha)*track1->GetSigmaY2();
1133 sigmasq[2]=track1->GetSigmaZ2();
1136 if(!TrackToPoint(track1,ri,wWi)) {optUseWeights=kFALSE;printf("WARNING\n");}
1139 for(Int_t ia=0;ia<3;ia++){
1140 for(Int_t ib=0;ib<3;ib++){
1141 wmat[iel]=wWi(ia,ib);
1145 linarray[i] = new AliStrLine(pos,sigmasq,wmat,dir);
1147 fVert=TrackletVertexFinder(linarray,knacc,optUseWeights);
1148 for(Int_t i=0; i<knacc; i++) delete linarray[i];
1151 //---------------------------------------------------------------------------
1152 AliESDVertex AliVertexerTracks::TrackletVertexFinder(const TClonesArray *lines, Int_t optUseWeights)
1154 // Calculate the point at minimum distance to prepared tracks (TClonesArray)
1155 const Int_t knacc = (Int_t)lines->GetEntriesFast();
1156 AliStrLine** lines2 = new AliStrLine* [knacc];
1157 for(Int_t i=0; i<knacc; i++){
1158 lines2[i]= (AliStrLine*)lines->At(i);
1160 AliESDVertex vert = TrackletVertexFinder(lines2,knacc,optUseWeights);
1165 //---------------------------------------------------------------------------
1166 AliESDVertex AliVertexerTracks::TrackletVertexFinder(AliStrLine **lines, const Int_t knacc, Int_t optUseWeights)
1168 // Calculate the point at minimum distance to prepared tracks (array of AliStrLine)
1170 Double_t initPos[3]={0.,0.,0.};
1172 Double_t (*vectP0)[3]=new Double_t [knacc][3];
1173 Double_t (*vectP1)[3]=new Double_t [knacc][3];
1176 Double_t dsum[3]={0,0,0};
1177 TMatrixD sumWi(3,3);
1178 for(Int_t i=0;i<3;i++){
1179 for(Int_t j=0;j<3;j++){
1185 for(Int_t i=0; i<knacc; i++){
1186 AliStrLine *line1 = lines[i];
1187 Double_t p0[3],cd[3],sigmasq[3];
1189 if(!line1) {printf("ERROR %d %d\n",i,knacc); continue;}
1192 line1->GetSigma2P0(sigmasq);
1193 line1->GetWMatrix(wmat);
1196 for(Int_t ia=0;ia<3;ia++){
1197 for(Int_t ib=0;ib<3;ib++){
1198 wWi(ia,ib)=wmat[iel];
1205 Double_t p1[3]={p0[0]+cd[0],p0[1]+cd[1],p0[2]+cd[2]};
1213 Double_t matr[3][3];
1215 if(optUseWeights==0)GetStrLinDerivMatrix(p0,p1,matr,dknow);
1216 else GetStrLinDerivMatrix(p0,p1,sigmasq,matr,dknow);
1219 for(Int_t iii=0;iii<3;iii++){
1220 dsum[iii]+=dknow[iii];
1221 for(Int_t lj=0;lj<3;lj++) sum[iii][lj]+=matr[iii][lj];
1225 TMatrixD invsumWi(TMatrixD::kInverted,sumWi);
1226 Double_t covmatrix[6];
1227 covmatrix[0] = invsumWi(0,0);
1228 covmatrix[1] = invsumWi(0,1);
1229 covmatrix[2] = invsumWi(1,1);
1230 covmatrix[3] = invsumWi(0,2);
1231 covmatrix[4] = invsumWi(1,2);
1232 covmatrix[5] = invsumWi(2,2);
1234 Double_t vett[3][3];
1235 Double_t det=GetDeterminant3X3(sum);
1238 if(TMath::Abs(det) > kAlmost0){
1239 for(Int_t zz=0;zz<3;zz++){
1240 for(Int_t ww=0;ww<3;ww++){
1241 for(Int_t kk=0;kk<3;kk++) vett[ww][kk]=sum[ww][kk];
1243 for(Int_t kk=0;kk<3;kk++) vett[kk][zz]=dsum[kk];
1244 initPos[zz]=GetDeterminant3X3(vett)/det;
1248 for(Int_t i=0; i<knacc; i++){
1249 Double_t p0[3]={0,0,0},p1[3]={0,0,0};
1250 for(Int_t ii=0;ii<3;ii++){
1251 p0[ii]=vectP0[i][ii];
1252 p1[ii]=vectP1[i][ii];
1254 sigma+=GetStrLinMinDist(p0,p1,initPos);
1257 if(sigma>0.) {sigma=TMath::Sqrt(sigma);}else{sigma=999;}
1261 AliESDVertex theVert(initPos,covmatrix,99999.,knacc);
1262 theVert.SetDispersion(sigma);
1268 //---------------------------------------------------------------------------
1269 Bool_t AliVertexerTracks::TrackToPoint(AliExternalTrackParam *t,
1270 TMatrixD &ri,TMatrixD &wWi,
1271 Bool_t uUi3by3) const
1274 // Extract from the AliExternalTrackParam the global coordinates ri and covariance matrix
1275 // wWi of the space point that it represents (to be used in VertexFitter())
1279 Double_t rotAngle = t->GetAlpha();
1280 if(rotAngle<0.) rotAngle += 2.*TMath::Pi();
1281 Double_t cosRot = TMath::Cos(rotAngle);
1282 Double_t sinRot = TMath::Sin(rotAngle);
1285 Double_t lambda = TMath::ATan(t->GetTgl());
1286 Double_t cosLam = TMath::Cos(lambda);
1287 Double_t sinLam = TMath::Sin(lambda);
1290 ri(0,0) = t->GetX()*cosRot-t->GetY()*sinRot;
1291 ri(1,0) = t->GetX()*sinRot+t->GetY()*cosRot;
1292 ri(2,0) = t->GetZ();
1295 // matrix to go from global (x,y,z) to local (y,z);
1305 // RS: Added polar inclination
1307 qQi(1,0) = -sinLam*cosRot;
1308 qQi(1,1) = -sinLam*sinRot;
1311 // covariance matrix of local (y,z) - inverted
1313 uUi(0,0) = t->GetSigmaY2();
1314 uUi(0,1) = t->GetSigmaZY();
1315 uUi(1,0) = t->GetSigmaZY();
1316 uUi(1,1) = t->GetSigmaZ2();
1318 //printf(" %f %f",uUi(0,0),uUi(0,1));
1319 //printf(" %f %f",uUi(1,0),uUi(1,1));
1321 if(uUi.Determinant() <= 0.) return kFALSE;
1322 TMatrixD uUiInv(TMatrixD::kInverted,uUi);
1324 // weights matrix: wWi = qQiT * uUiInv * qQi
1325 TMatrixD uUiInvQi(uUiInv,TMatrixD::kMult,qQi);
1326 TMatrixD m(qQi,TMatrixD::kTransposeMult,uUiInvQi);
1329 if(fVert.GetNContributors()<1) AliFatal("Vertex from finder is empty");
1330 // matrix to go from global (x,y,z) to local (x,y,z);
1342 // covariance of fVert along the track
1343 Double_t p[3],pt,ptot;
1345 pt = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
1346 ptot = TMath::Sqrt(pt*pt+p[2]*p[2]);
1347 Double_t cphi = p[0]/pt; //cos(phi)=px/pt
1348 Double_t sphi = p[1]/pt; //sin(phi)=py/pt
1349 Double_t clambda = pt/ptot; //cos(lambda)=pt/ptot
1350 Double_t slambda = p[2]/ptot; //sin(lambda)=pz/ptot
1351 Double_t covfVert[6];
1352 fVert.GetCovMatrix(covfVert);
1353 Double_t covfVertalongt =
1354 covfVert[0]*cphi*cphi*clambda*clambda
1355 +covfVert[1]*2.*cphi*sphi*clambda*clambda
1356 +covfVert[3]*2.*cphi*clambda*slambda
1357 +covfVert[2]*sphi*sphi*clambda*clambda
1358 +covfVert[4]*2.*sphi*clambda*slambda
1359 +covfVert[5]*slambda*slambda;
1360 // covariance matrix of local (x,y,z) - inverted
1362 uUi(0,0) = covfVertalongt * fnSigmaForUi00 * fnSigmaForUi00;
1363 AliDebug(1,Form("=====> sqrtUi00 cm %f",TMath::Sqrt(uUi(0,0))));
1367 uUi(1,1) = t->GetSigmaY2();
1368 uUi(1,2) = t->GetSigmaZY();
1370 uUi(2,1) = t->GetSigmaZY();
1371 uUi(2,2) = t->GetSigmaZ2();
1372 //printf(" Ui :\n");
1373 //printf(" %f %f\n",uUi(0,0),uUi(0,1));
1374 //printf(" %f %f\n",uUi(1,0),uUi(1,1));
1376 if(uUi.Determinant() <= 0.) return kFALSE;
1377 TMatrixD uUiInv(TMatrixD::kInverted,uUi);
1379 // weights matrix: wWi = qQiT * uUiInv * qQi
1380 TMatrixD uUiInvQi(uUiInv,TMatrixD::kMult,qQi);
1381 TMatrixD m(qQi,TMatrixD::kTransposeMult,uUiInvQi);
1388 //---------------------------------------------------------------------------
1389 void AliVertexerTracks::TooFewTracks()
1392 // When the number of tracks is < fMinTracks,
1393 // deal with vertices not found and prepare to exit
1395 AliDebug(1,"TooFewTracks");
1397 Double_t pos[3],err[3];
1398 pos[0] = fNominalPos[0];
1399 err[0] = TMath::Sqrt(fNominalCov[0]);
1400 pos[1] = fNominalPos[1];
1401 err[1] = TMath::Sqrt(fNominalCov[2]);
1402 pos[2] = fNominalPos[2];
1403 err[2] = TMath::Sqrt(fNominalCov[5]);
1404 Int_t ncontr = (err[0]>1. ? -1 : -3);
1405 if(fCurrentVertex) { delete fCurrentVertex; fCurrentVertex=0; }
1406 fCurrentVertex = new AliESDVertex(pos,err);
1407 fCurrentVertex->SetNContributors(ncontr);
1410 fCurrentVertex->SetTitle("VertexerTracksWithConstraint");
1412 fCurrentVertex->SetTitle("VertexerTracksNoConstraint");
1415 if(!fTrkArraySel.IsEmpty()) fTrkArraySel.Delete();
1416 if(fIdSel) {delete [] fIdSel; fIdSel=NULL;}
1417 if(fTrksToSkip) {delete [] fTrksToSkip; fTrksToSkip=NULL;}
1421 //---------------------------------------------------------------------------
1422 void AliVertexerTracks::VertexFinder(Int_t optUseWeights)
1425 // Get estimate of vertex position in (x,y) from tracks DCA
1427 Double_t initPos[3];
1429 for(Int_t i=0;i<2;i++)initPos[i]=fNominalPos[i];
1430 Int_t nacc = (Int_t)fTrkArraySel.GetEntriesFast();
1431 Double_t aver[3]={0.,0.,0.};
1432 Double_t aversq[3]={0.,0.,0.};
1433 Double_t sigmasq[3]={0.,0.,0.};
1436 AliExternalTrackParam *track1;
1437 AliExternalTrackParam *track2;
1438 Double_t pos[3],dir[3];
1439 Double_t alpha,mindist;
1441 for(Int_t i=0; i<nacc; i++){
1442 track1 = (AliExternalTrackParam*)fTrkArraySel.At(i);
1443 alpha=track1->GetAlpha();
1444 mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1];
1445 track1->GetXYZAt(mindist,GetFieldkG(),pos);
1446 track1->GetPxPyPzAt(mindist,GetFieldkG(),dir);
1447 AliStrLine *line1 = new AliStrLine(pos,dir);
1449 // AliStrLine *line1 = new AliStrLine();
1450 // track1->ApproximateHelixWithLine(mindist,GetFieldkG(),line1);
1452 for(Int_t j=i+1; j<nacc; j++){
1453 track2 = (AliExternalTrackParam*)fTrkArraySel.At(j);
1454 alpha=track2->GetAlpha();
1455 mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1];
1456 track2->GetXYZAt(mindist,GetFieldkG(),pos);
1457 track2->GetPxPyPzAt(mindist,GetFieldkG(),dir);
1458 AliStrLine *line2 = new AliStrLine(pos,dir);
1459 // AliStrLine *line2 = new AliStrLine();
1460 // track2->ApproximateHelixWithLine(mindist,GetFieldkG(),line2);
1461 Double_t distCA=line2->GetDCA(line1);
1462 //printf("%d %d %f\n",i,j,distCA);
1463 if(fDCAcut<=0 || (fDCAcut>0&&distCA<fDCAcut)){
1464 Double_t pnt1[3],pnt2[3],crosspoint[3];
1466 if(optUseWeights<=0){
1467 Int_t retcode = line2->Cross(line1,crosspoint);
1470 for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj];
1471 for(Int_t jj=0;jj<3;jj++)aversq[jj]+=(crosspoint[jj]*crosspoint[jj]);
1474 if(optUseWeights>0){
1475 Int_t retcode = line1->CrossPoints(line2,pnt1,pnt2);
1478 alpha=track1->GetAlpha();
1479 cs=TMath::Cos(alpha); sn=TMath::Sin(alpha);
1480 Double_t sx1=sn*sn*track1->GetSigmaY2(), sy1=cs*cs*track1->GetSigmaY2();
1481 alpha=track2->GetAlpha();
1482 cs=TMath::Cos(alpha); sn=TMath::Sin(alpha);
1483 Double_t sx2=sn*sn*track2->GetSigmaY2(), sy2=cs*cs*track2->GetSigmaY2();
1484 Double_t sz1=track1->GetSigmaZ2(), sz2=track2->GetSigmaZ2();
1485 Double_t wx1=sx2/(sx1+sx2), wx2=1.- wx1;
1486 Double_t wy1=sy2/(sy1+sy2), wy2=1.- wy1;
1487 Double_t wz1=sz2/(sz1+sz2), wz2=1.- wz1;
1488 crosspoint[0]=wx1*pnt1[0] + wx2*pnt2[0];
1489 crosspoint[1]=wy1*pnt1[1] + wy2*pnt2[1];
1490 crosspoint[2]=wz1*pnt1[2] + wz2*pnt2[2];
1493 for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj];
1494 for(Int_t jj=0;jj<3;jj++)aversq[jj]+=(crosspoint[jj]*crosspoint[jj]);
1503 for(Int_t jj=0;jj<3;jj++){
1504 initPos[jj] = aver[jj]/ncombi;
1505 //printf("%f\n",initPos[jj]);
1507 sigmasq[jj]=aversq[jj]-initPos[jj]*initPos[jj];
1510 sigma=TMath::Sqrt(TMath::Abs(sigma));
1513 Warning("VertexFinder","Finder did not succed");
1516 fVert.SetXYZ(initPos);
1517 fVert.SetDispersion(sigma);
1518 fVert.SetNContributors(ncombi);
1520 //---------------------------------------------------------------------------
1521 void AliVertexerTracks::VertexFitter(Bool_t vfit, Bool_t chiCalc,Int_t useWeights)
1524 // The optimal estimate of the vertex position is given by a "weighted
1525 // average of tracks positions".
1526 // Original method: V. Karimaki, CMS Note 97/0051
1528 const double kTiny = 1e-9;
1529 Bool_t useConstraint = fConstraint;
1530 Double_t initPos[3];
1532 fVert.GetXYZ(initPos);
1534 initPos[0]=fNominalPos[0];
1535 initPos[1]=fNominalPos[1];
1536 initPos[2]=fNominalPos[2];
1539 Int_t nTrksSel = (Int_t)fTrkArraySel.GetEntries();
1540 if(nTrksSel==1) useConstraint=kTRUE;
1541 AliDebug(1,Form("--- VertexFitter(): start (%d,%d,%d)",vfit,chiCalc,useWeights));
1542 AliDebug(1,Form(" Number of tracks in array: %d\n",nTrksSel));
1543 AliDebug(1,Form(" Minimum # tracks required in fit: %d\n",fMinTracks));
1544 AliDebug(1,Form(" Vertex position after finder: %f,%f,%f\n",initPos[0],initPos[1],initPos[2]));
1545 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])));
1547 // special treatment for few-tracks fits (e.g. secondary vertices)
1548 Bool_t uUi3by3 = kFALSE; if(nTrksSel<5 && !useConstraint && !useWeights) uUi3by3 = kTRUE;
1551 static TMatrixD rv(3,1);
1552 static TMatrixD vV(3,3);
1553 rv(0,0) = initPos[0];
1554 rv(1,0) = initPos[1];
1555 rv(2,0) = initPos[2];
1556 Double_t xlStart,alpha;
1557 Int_t nTrksUsed = 0;
1558 Double_t chi2=0,chi2i,chi2b;
1559 AliExternalTrackParam *t = 0;
1562 // initial vertex covariance matrix
1564 vVb(0,0) = fNominalCov[0];
1565 vVb(0,1) = fNominalCov[1];
1567 vVb(1,0) = fNominalCov[1];
1568 vVb(1,1) = fNominalCov[2];
1572 vVb(2,2) = fNominalCov[5];
1573 TMatrixD vVbInv(TMatrixD::kInverted,vVb);
1575 rb(0,0) = fNominalPos[0];
1576 rb(1,0) = fNominalPos[1];
1577 rb(2,0) = fNominalPos[2];
1578 TMatrixD vVbInvrb(vVbInv,TMatrixD::kMult,rb);
1580 int currBC = fVert.GetBC();
1583 // 1st - estimate of vtx using all tracks
1584 // 2nd - estimate of global chi2
1586 for(step=0; step<2; step++) {
1587 if (step==0 && !vfit) continue;
1588 else if (step==1 && !chiCalc) continue;
1591 fMVWSum = fMVWE2 = 0;
1592 if(step==1) { initPos[0]=rv(0,0); initPos[1]=rv(1,0); initPos[2]=rv(2,0);}
1593 AliDebug(2,Form("Step%d: inipos: %+f %+f %+f MinTr: %d, Sig2:%.2f)",step,initPos[0],initPos[1],initPos[2],fMinTracks,fMVSigma2));
1595 TMatrixD sumWiri(3,1);
1596 TMatrixD sumWi(3,3);
1597 for(i=0; i<3; i++) {
1599 for(j=0; j<3; j++) sumWi(j,i) = 0.;
1602 // mean vertex constraint
1605 sumWiri(i,0) += vVbInvrb(i,0);
1606 for(k=0;k<3;k++) sumWi(i,k) += vVbInv(i,k);
1609 TMatrixD deltar = rv; deltar -= rb;
1610 TMatrixD vVbInvdeltar(vVbInv,TMatrixD::kMult,deltar);
1611 chi2b = deltar(0,0)*vVbInvdeltar(0,0)+
1612 deltar(1,0)*vVbInvdeltar(1,0)+
1613 deltar(2,0)*vVbInvdeltar(2,0);
1618 for(k=0; k<nTrksSel; k++) {
1620 // get track from track array
1621 t = (AliExternalTrackParam*)fTrkArraySel.At(k);
1622 if (useWeights && t->TestBit(kBitUsed)) continue;
1624 int tBC = int(t->GetUniqueID()) - kTOFBCShift; // BC assigned to this track
1625 if (fSelectOnTOFBunchCrossing) {
1626 if (!fKeepAlsoUnflaggedTOFBunchCrossing) continue; // don't consider tracks with undefined BC
1627 if (currBC!=AliVTrack::kTOFBCNA && tBC!=AliVTrack::kTOFBCNA && tBC!=currBC) continue; // track does not match to current BCid
1629 alpha = t->GetAlpha();
1630 xlStart = initPos[0]*TMath::Cos(alpha)+initPos[1]*TMath::Sin(alpha);
1631 // to vtxSeed (from finder)
1632 t->PropagateTo(xlStart,GetFieldkG());
1634 // vector of track global coordinates
1636 // covariance matrix of ri
1639 // get space point from track
1640 if(!TrackToPoint(t,ri,wWi,uUi3by3)) continue;
1643 TMatrixD deltar = rv; deltar -= ri;
1644 TMatrixD wWideltar(wWi,TMatrixD::kMult,deltar);
1645 chi2i = deltar(0,0)*wWideltar(0,0)+
1646 deltar(1,0)*wWideltar(1,0)+
1647 deltar(2,0)*wWideltar(2,0);
1650 //double sg = TMath::Sqrt(fMVSigma2);
1651 //double chi2iw = (deltar(0,0)*wWideltar(0,0)+deltar(1,0)*wWideltar(1,0))/sg + deltar(2,0)*wWideltar(2,0)/fMVSigma2;
1652 //double wgh = (1-chi2iw/fMVTukey2);
1653 double chi2iw = chi2i;
1654 double wgh = (1-chi2iw/fMVTukey2/fMVSigma2);
1656 if (wgh<kTiny) wgh = 0;
1657 else if (useWeights==2) wgh = 1.; // use as binary weight
1658 if (step==1) ((AliESDtrack*)t)->SetBit(kBitUsed, wgh>0);
1659 if (wgh<kTiny) continue; // discard the track
1660 wWi *= wgh; // RS: use weight?
1662 fMVWE2 += wgh*chi2iw;
1664 // add to total chi2
1665 if (fSelectOnTOFBunchCrossing && tBC!=AliVTrack::kTOFBCNA && currBC<0) currBC = tBC;
1668 TMatrixD wWiri(wWi,TMatrixD::kMult,ri);
1673 } // end loop on tracks
1675 if(nTrksUsed < fMinTracks) {
1680 Double_t determinant = sumWi.Determinant();
1681 if(determinant < fMinDetFitter) {
1682 AliDebug(1,Form("det(V) = %f (<%f)\n",determinant,fMinDetFitter));
1688 // inverted of weights matrix
1689 TMatrixD invsumWi(TMatrixD::kInverted,sumWi);
1691 // position of primary vertex
1692 rv.Mult(vV,sumWiri);
1694 } // end loop on the 2 steps
1697 fVert.SetNContributors(-1);
1700 if (fCurrentVertex) fVert = *fCurrentVertex; // RS
1705 Double_t position[3];
1706 position[0] = rv(0,0);
1707 position[1] = rv(1,0);
1708 position[2] = rv(2,0);
1709 Double_t covmatrix[6];
1710 covmatrix[0] = vV(0,0);
1711 covmatrix[1] = vV(0,1);
1712 covmatrix[2] = vV(1,1);
1713 covmatrix[3] = vV(0,2);
1714 covmatrix[4] = vV(1,2);
1715 covmatrix[5] = vV(2,2);
1717 // for correct chi2/ndf, count constraint as additional "track"
1718 if(fConstraint) nTrksUsed++;
1720 if (vfit && !chiCalc) { // RS: special mode for multi-vertex finder
1721 fVert.SetXYZ(position);
1722 fVert.SetCovarianceMatrix(covmatrix);
1723 fVert.SetNContributors(nTrksUsed);
1726 // store data in the vertex object
1727 if(fCurrentVertex) { delete fCurrentVertex; fCurrentVertex=0; }
1728 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nTrksUsed);
1729 fCurrentVertex->SetBC(currBC);
1730 fVert = *fCurrentVertex; // RS
1731 AliDebug(1," Vertex after fit:");
1732 AliDebug(1,Form("xyz: %f %f %f; nc %d",fCurrentVertex->GetXv(),fCurrentVertex->GetYv(),fCurrentVertex->GetZv(),fCurrentVertex->GetNContributors()));
1733 AliDebug(1,"--- VertexFitter(): finish\n");
1738 //----------------------------------------------------------------------------
1739 AliESDVertex* AliVertexerTracks::VertexForSelectedTracks(const TObjArray *trkArray,
1741 Bool_t optUseFitter,
1742 Bool_t optPropagate,
1743 Bool_t optUseDiamondConstraint)
1746 // Return vertex from tracks (AliExternalTrackParam) in array
1749 // set optUseDiamondConstraint=TRUE only if you are reconstructing the
1751 if(optUseDiamondConstraint) {
1757 // get tracks and propagate them to initial vertex position
1758 fIdSel = new UShort_t[(Int_t)trkArray->GetEntriesFast()];
1759 Int_t nTrksSel = PrepareTracks(*trkArray,id,0);
1760 if((!optUseDiamondConstraint && nTrksSel<TMath::Max(2,fMinTracks)) ||
1761 (optUseDiamondConstraint && nTrksSel<1)) {
1763 return fCurrentVertex;
1768 AliDebug(1,"Just one track");
1769 OneTrackVertFinder();
1772 case 1: StrLinVertexFinderMinDist(1); break;
1773 case 2: StrLinVertexFinderMinDist(0); break;
1774 case 3: HelixVertexFinder(); break;
1775 case 4: VertexFinder(1); break;
1776 case 5: VertexFinder(0); break;
1777 default: printf("Wrong algorithm\n"); break;
1780 AliDebug(1," Vertex finding completed\n");
1786 Double_t position[3]={fVert.GetXv(),fVert.GetYv(),fVert.GetZv()};
1787 Double_t covmatrix[6];
1788 fVert.GetCovMatrix(covmatrix);
1789 Double_t chi2=99999.;
1790 Int_t nTrksUsed=fVert.GetNContributors();
1791 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nTrksUsed);
1793 fCurrentVertex->SetDispersion(fVert.GetDispersion());
1796 // set indices of used tracks and propagate track to found vertex
1797 UShort_t *indices = 0;
1798 Double_t d0z0[2],covd0z0[3];
1799 AliExternalTrackParam *t = 0;
1800 if(fCurrentVertex->GetNContributors()>0) {
1801 indices = new UShort_t[fTrkArraySel.GetEntriesFast()];
1802 for(Int_t jj=0; jj<(Int_t)fTrkArraySel.GetEntriesFast(); jj++) {
1803 indices[jj] = fIdSel[jj];
1804 t = (AliExternalTrackParam*)fTrkArraySel.At(jj);
1805 if(optPropagate && optUseFitter) {
1806 if(TMath::Sqrt(fCurrentVertex->GetXv()*fCurrentVertex->GetXv()+fCurrentVertex->GetYv()*fCurrentVertex->GetYv())<3.) {
1807 t->PropagateToDCA(fCurrentVertex,GetFieldkG(),100.,d0z0,covd0z0);
1808 AliDebug(1,Form("Track %d propagated to found vertex",jj));
1810 AliWarning("Found vertex outside beam pipe!");
1814 fCurrentVertex->SetIndices(fCurrentVertex->GetNContributors(),indices);
1818 if (indices) {delete [] indices; indices=NULL;}
1819 delete [] fIdSel; fIdSel=NULL;
1820 fTrkArraySel.Delete();
1822 return fCurrentVertex;
1825 //----------------------------------------------------------------------------
1826 AliESDVertex* AliVertexerTracks::VertexForSelectedESDTracks(TObjArray *trkArray,
1827 Bool_t optUseFitter,
1828 Bool_t optPropagate,
1829 Bool_t optUseDiamondConstraint)
1833 // Return vertex from array of ESD tracks
1836 Int_t nTrks = (Int_t)trkArray->GetEntriesFast();
1837 UShort_t *id = new UShort_t[nTrks];
1839 AliESDtrack *esdt = 0;
1840 for(Int_t i=0; i<nTrks; i++){
1841 esdt = (AliESDtrack*)trkArray->At(i);
1842 id[i] = (UShort_t)esdt->GetID();
1845 VertexForSelectedTracks(trkArray,id,optUseFitter,optPropagate,optUseDiamondConstraint);
1847 delete [] id; id=NULL;
1849 return fCurrentVertex;
1852 //______________________________________________________
1853 Bool_t AliVertexerTracks::FindNextVertexMV()
1855 // try to find a new vertex
1856 fMVSigma2 = fMVSig2Ini;
1857 double prevSig2 = fMVSigma2;
1858 double minDst2 = fMVMinDst*fMVMinDst;
1859 const double kSigLimit = 1.0;
1860 const double kSigLimitE = kSigLimit+1e-6;
1861 const double kPushFactor = 0.5;
1862 const int kMaxIter = 20;
1863 double push = kPushFactor;
1866 double posP[3]={0,0,0},pos[3]={0,0,0};
1871 fVert.SetBC(AliVTrack::kTOFBCNA);
1872 VertexFitter(kTRUE,kFALSE,1);
1873 if (fVert.GetNContributors()<fMinTracks) {
1874 AliDebug(3,Form("Failed in iteration %d: No Contributirs",iter));
1877 if (fMVWSum>0) fMVSigma2 = TMath::Max(fMVWE2/fMVWSum,kSigLimit);
1879 AliDebug(3,Form("Failed %d, no weithgs",iter));
1884 double sigRed = (prevSig2-fMVSigma2)/prevSig2; // reduction of sigma2
1887 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]);
1888 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));
1889 if ( (++iter<kMaxIter) && (sigRed<0 || sigRed<fMVMinSig2Red) && fMVSigma2>fMVMaxSigma2) {
1890 fMVSigma2 *= push; // stuck, push little bit
1891 push *= kPushFactor;
1892 if (fMVSigma2<1.) fMVSigma2 = 1.;
1893 AliDebug(3,Form("Pushed sigma2 to %f",fMVSigma2));
1895 else if (dst2<minDst2 && ((sigRed<0 || sigRed<fMVMinSig2Red) || fMVSigma2<kSigLimitE)) break;
1897 fVert.GetXYZ(posP); // fetch previous vertex position
1898 prevSig2 = fMVSigma2;
1899 } while(iter<kMaxIter);
1901 if (fVert.GetNContributors()<0 || iter>kMaxIter || fMVSigma2>fMVMaxSigma2) {
1905 VertexFitter(kFALSE,kTRUE,fMVFinalWBinary ? 2:1); // final chi2 calculation
1906 int nv = fMVVertices->GetEntries();
1908 int ntrk = fTrkArraySel.GetEntries();
1909 int nindices = fCurrentVertex->GetNContributors() - (fConstraint ? 1:0);
1910 UShort_t *indices = 0;
1911 if (nindices>0) indices = new UShort_t[nindices];
1913 for (int itr=0;itr<ntrk;itr++) {
1914 AliExternalTrackParam* t = (AliExternalTrackParam*)fTrkArraySel[itr];
1915 if (t->TestBit(kBitAccounted) || !t->TestBit(kBitUsed)) continue; // already belongs to some vertex
1916 t->SetBit(kBitAccounted);
1917 indices[nadded++] = fIdSel[itr];
1919 if (nadded!=nindices) printf("Mismatch : NInd: %d Nadd: %d\n",nindices,nadded);
1920 fCurrentVertex->SetIndices(nindices,indices);
1922 TString title="VertexerTracksMVNoConstraint";
1923 if(fConstraint) title="VertexerTracksMVWithConstraint";
1924 fCurrentVertex->SetTitle(title.Data());
1925 fMVVertices->AddLast(fCurrentVertex);
1926 AliDebug(3,Form("Added new vertex #%d NCont:%d XYZ: %f %f %f",nindices,nv,fCurrentVertex->GetX(),fCurrentVertex->GetY(),fCurrentVertex->GetZ()));
1927 if (indices) delete[] indices;
1928 fCurrentVertex = 0; // already attached to fMVVertices
1933 //______________________________________________________
1934 void AliVertexerTracks::FindVerticesMV()
1936 // find and fit multiple vertices
1938 double step = fMVScanStep>1 ? fMVScanStep : 1.;
1939 double zmx = 3*TMath::Sqrt(fNominalCov[5]);
1941 int nz = (int)(zmx-zmn)/step; if (nz<1) nz=1;
1942 double dz = (zmx-zmn)/nz;
1944 AliDebug(2,Form("%d seeds between %f and %f",nz,zmn+dz/2,zmx+dz/2));
1946 if (!fMVVertices) fMVVertices = new TObjArray(10);
1947 fMVVertices->Clear();
1949 int ntrLeft = (Int_t)fTrkArraySel.GetEntries();
1951 double sig2Scan = fMVSig2Ini;
1952 Bool_t runMore = kTRUE;
1955 fMVSig2Ini = sig2Scan*1e3; // try wide search
1956 Bool_t found = kFALSE;
1958 fVert.SetNContributors(-1);
1959 fVert.SetXYZ(fNominalPos);
1960 AliDebug(3,Form("Wide search #%d Z= %f Sigma2=%f",cntWide,fNominalPos[2],fMVSig2Ini));
1961 if (FindNextVertexMV()) { // are there tracks left to consider?
1962 AliESDVertex* vtLast = (AliESDVertex*)fMVVertices->Last();
1963 if (vtLast && vtLast->GetNContributors()>0) ntrLeft -= vtLast->GetNContributors()-(fConstraint ? 1:0);
1964 if (ntrLeft<1) runMore = kFALSE;
1968 // if nothing is found, do narrow sig2ini scan
1969 fMVSig2Ini = sig2Scan;
1970 for (;izStart<nz;izStart++) {
1971 double zSeed = zmn+dz*(izStart+0.5);
1972 AliDebug(3,Form("Seed %d: Z= %f Sigma2=%f",izStart,zSeed,fMVSig2Ini));
1973 fVert.SetNContributors(-1);
1974 fVert.SetXYZ(fNominalPos);
1976 if (FindNextVertexMV()) { // are there tracks left to consider?
1977 AliESDVertex* vtLast = (AliESDVertex*)fMVVertices->Last();
1978 if (vtLast && vtLast->GetNContributors()>0) ntrLeft -= vtLast->GetNContributors()-(fConstraint ? 1:0);
1979 if (ntrLeft<1) runMore = kFALSE;
1984 runMore = found; // if nothing was found, no need for new iteration
1986 fMVSig2Ini = sig2Scan;
1987 int nvFound = fMVVertices->GetEntriesFast();
1988 AliDebug(2,Form("Number of found vertices: %d",nvFound));
1989 if (nvFound<1) TooFewTracks();
1990 if (AliLog::GetGlobalDebugLevel()>0) fMVVertices->Print();
1994 //______________________________________________________
1995 void AliVertexerTracks::AnalyzePileUp(AliESDEvent* esdEv)
1997 // if multiple vertices are found, try to find the primary one and attach it as fCurrentVertex
1998 // then attach pile-up vertices directly to esdEv
2000 int nFND = (fMVVertices && fMVVertices->GetEntriesFast()) ? fMVVertices->GetEntriesFast() : 0;
2001 if (nFND<1) { if (!fCurrentVertex) TooFewTracks(); return;} // no multiple vertices
2005 for (int iv=0;iv<nFND;iv++) {
2006 AliESDVertex* fnd = (AliESDVertex*)fMVVertices->At(iv);
2008 nIndx[iv] = fnd->GetNIndices();
2010 TMath::Sort(nFND, nIndx, indCont, kTRUE); // sort in decreasing order of Nindices
2012 int distOrd[nFND],indx[nFND];
2013 for (int iv=0;iv<nFND;iv++) {
2014 AliESDVertex* fndI = (AliESDVertex*)fMVVertices->At(indCont[iv]);
2015 if (fndI->GetStatus()<1) continue; // discarded
2017 for (int jv=iv+1;jv<nFND;jv++) {
2018 AliESDVertex* fndJ = (AliESDVertex*)fMVVertices->At(indCont[jv]);
2019 if (fndJ->GetStatus()<1) continue;
2020 dists[ncomp] = fndI->GetWDist(fndJ)*fndJ->GetNIndices();
2021 distOrd[ncomp] = indCont[jv];
2022 indx[ncomp] = ncomp;
2025 if (ncomp<1) continue;
2026 TMath::Sort(ncomp, dists, indx, kFALSE); // sort in increasing distance order
2027 for (int jv0=0;jv0<ncomp;jv0++) {
2028 int jv = distOrd[indx[jv0]];
2029 AliESDVertex* fndJ = (AliESDVertex*)fMVVertices->At(jv);
2030 if (dists[indx[jv0]]<fMVMaxWghNtr) { // candidate for split vertex
2031 //before eliminating the small close vertex, check if we should transfere its BC to largest one
2032 if (fndJ->GetBC()!=AliVTrack::kTOFBCNA && fndI->GetBC()==AliVTrack::kTOFBCNA) fndI->SetBC(fndJ->GetBC());
2034 // leave the vertex only if both vertices have definit but different BC's, then this is not splitting.
2035 if ( (fndJ->GetBC()==fndI->GetBC()) || (fndJ->GetBC()==AliVTrack::kTOFBCNA)) fndJ->SetNContributors(-fndJ->GetNContributors());
2040 // select as a primary the largest vertex with BC=0, or the largest with BC non-ID
2041 int primBC0=-1,primNoBC=-1;
2042 for (int iv0=0;iv0<nFND;iv0++) {
2043 int iv = indCont[iv0];
2044 AliESDVertex* fndI = (AliESDVertex*)fMVVertices->At(iv);
2045 if (!fndI) continue;
2046 if (fndI->GetStatus()<1) {fMVVertices->RemoveAt(iv); delete fndI; continue;}
2047 if (primBC0<0 && fndI->GetBC()==0) primBC0 = iv;
2048 if (primNoBC<0 && fndI->GetBC()==AliVTrack::kTOFBCNA) primNoBC = iv;
2051 if (primBC0>=0) fCurrentVertex = (AliESDVertex*)fMVVertices->At(primBC0);
2052 if (!fCurrentVertex && primNoBC>=0) fCurrentVertex = (AliESDVertex*)fMVVertices->At(primNoBC);
2053 if (fCurrentVertex) fMVVertices->Remove(fCurrentVertex);
2054 else { // all vertices have BC>0, no primary vertex
2055 fCurrentVertex = new AliESDVertex();
2056 fCurrentVertex->SetNContributors(-3);
2057 fCurrentVertex->SetBC(AliVTrack::kTOFBCNA);
2059 fCurrentVertex->SetID(-1);
2061 // add pileup vertices
2063 for (int iv0=0;iv0<nFND;iv0++) {
2064 int iv = indCont[iv0];
2065 AliESDVertex* fndI = (AliESDVertex*)fMVVertices->At(iv);
2066 if (!fndI) continue;
2067 fndI->SetID(++nadd);
2068 esdEv->AddPileupVertexTracks(fndI);
2071 fMVVertices->Delete();