1 //------------------------------------------------------------------------
2 // Test macro for AliVertexerTracks.
3 // Contains several functions.
5 // A. Dainese - INFN Legnaro
6 //------------------------------------------------------------------------
7 void AliVertexerTracksTest(Double_t nSigma=3.,
8 Bool_t useMeanVtx=kTRUE,
9 TString outname="AliVertexerTracksTest.root") {
10 //------------------------------------------------------------------------
11 // Run vertex reconstruction and store results in histos and ntuple
12 //------------------------------------------------------------------------
15 delete gAlice->GetRunLoader();
20 AliRunLoader *rl = AliRunLoader::Open("galice.root");
22 cerr<<"Can not open session"<<endl;
25 Int_t retval = rl->LoadgAlice();
27 cerr<<"LoadgAlice returned error"<<endl;
31 retval = rl->LoadHeader();
33 cerr<<"LoadHeader returned error"<<endl;
37 gAlice=rl->GetAliRun();
39 // Get field from galice.root
40 AliMagF *fiel = (AliMagF*)gAlice->Field();
41 // Set the conversion constant between curvature and Pt
42 AliTracker::SetFieldMap(fiel,kTRUE);
44 //**** Switch on the PID class
47 Int_t nEvents = (Int_t)rl->GetNumberOfEvents();
52 Double_t diffX,diffY,diffZ;
53 Double_t diffXerr,diffYerr,diffZerr;
54 Double_t multiplicity;
58 TH1F *hdiffX = new TH1F("hdiffX","x_{found} - x_{true} [#mum]",1000,-5000,5000);
59 TH1F *hdiffY = new TH1F("hdiffY","y_{found} - y_{true} [#mum]",1000,-5000,5000);
60 TH1F *hdiffZ = new TH1F("hdiffZ","z_{found} - z_{true} [#mum]",1000,-5000,5000);
62 TH1F *hdiffXerr = new TH1F("hdiffXerr","#Delta x/#sigma_{x}",100,-5,5);
63 TH1F *hdiffYerr = new TH1F("hdiffYerr","#Delta y/#sigma_{y}",100,-5,5);
64 TH1F *hdiffZerr = new TH1F("hdiffZerr","#Delta z/#sigma_{z}",100,-5,5);
67 TNtuple *ntVtxRes = new TNtuple("ntVtxRes","Vertex Resolution's Ntupla with multiplicity","ntracks:nitstracks5or6:nitstracksFromStrange:nitstracksFromStrange5or6:diffX:diffY:diffZ:diffXerr:diffYerr:diffZerr:multiplicity:nc");
71 // ----------- Create vertexer --------------------------
72 AliESDVertex *initVertex = 0;
74 // open the mean vertex
75 TFile *invtx = new TFile("AliESDVertexMean.root");
76 initVertex = (AliESDVertex*)invtx->Get("vtxmean");
80 Double_t pos[3]={0.5,0.5,0.};
81 Double_t err[3]={3.,3.,5.};
82 initVertex = new AliESDVertex(pos,err);
84 AliVertexerTracks *vertexer = new AliVertexerTracks();
85 vertexer->SetITSrefitNotRequired();
86 vertexer->SetVtxStart(initVertex);
87 vertexer->SetMinTracks(2);
88 vertexer->SetNSigmad0(nSigma);
89 //cout<<" Nsigma: "<<vertexer->GetNSigmad0()<<endl;
90 vertexer->SetDebug(1); // set to 1 to see what it does
91 //----------------------------------------------------------
93 if(gSystem->AccessPathName("AliESDs.root",kFileExists)) {
94 printf("AliESDs.root not found!\n");
97 TFile *fin = TFile::Open("AliESDs.root");
98 TTree *esdTree = (TTree*)fin->Get("esdTree");
101 esdTree->SetBranchAddress("ESD",&esd);
102 Int_t events = esdTree->GetEntries();
103 printf("Number of events in ESD tree: %d\n",events);
107 for(Int_t iev=0; iev<events; iev++) { //LOOP ON EVENTS
108 printf("-------------- EVENT %d --------------------\n",iev);
118 //=================================================
119 // LOOK IN THE SIMULATION
120 // true vertex position
121 Int_t npart = (Int_t)gAlice->GetEvent(iev);
122 printf("particles %d\n",npart);
123 AliHeader *header = (AliHeader*)rl->GetHeader();
124 AliGenPythiaEventHeader *pyheader = (AliGenPythiaEventHeader*)header->GenEventHeader();
125 pyheader->PrimaryVertex(o);
129 printf("True Vertex: (%f, %f, %f)\n",o[0],o[1],o[2]);
131 Double_t dNchdy = 0.;
133 Int_t nitstracks = 0;
134 Int_t nitstracksFromStrange = 0;
135 Int_t nitstracksFromStrange5or6 = 0;
136 Int_t nitstracks1 = 0;
137 Int_t nitstracks2 = 0;
138 Int_t nitstracks3 = 0;
139 Int_t nitstracks4 = 0;
140 Int_t nitstracks5 = 0;
141 Int_t nitstracks6 = 0;
142 Int_t nitstracks5or6 = 0;
145 for(Int_t pa=0; pa<npart; pa++) {
146 TParticle *part = (TParticle*)gAlice->GetMCApp()->Particle(pa);
147 Int_t pdg = part->GetPdgCode();
148 Int_t apdg = TMath::Abs(pdg);
149 Double_t energy = part->Energy();
150 if(energy>6900.) continue; // reject incoming protons
151 Double_t pz = part->Pz();
152 Double_t y = 0.5*TMath::Log((energy+pz+1.e-13)/(energy-pz+1.e-13));
154 // consider charged pi,K,p,el,mu
155 if(apdg!=11 && apdg!=13 && apdg!=211 && apdg!=321 && apdg!=2212) continue;
156 // reject secondaries
157 if(TMath::Sqrt((part->Vx()-o[0])*(part->Vx()-o[0])+(part->Vy()-o[1])*(part->Vy()-o[1]))>0.0010) continue;
158 if(TMath::Abs(y)<1.0) dNchdy += 0.5; // count 1/2 of particles in |y|<1
159 } // end loop on particles
160 multiplicity=(Double_t)dNchdy;
162 printf(" dNch/dy = %f\n",dNchdy);
163 //===============================================================
166 esdTree->GetEvent(iev);
167 Int_t ntracks = esd->GetNumberOfTracks();
168 printf("Number of tracks in ESD %d : %d\n",iev,ntracks);
170 ntVtxRes->Fill(ntracks,nitstracks5or6,nitstracksFromStrange,nitstracksFromStrange5or6,diffX,diffY,diffZ,diffXerr,diffYerr,diffZerr,multiplicity,nc);
175 AliESDVertex *vertex = (AliESDVertex*)vertexer->FindPrimaryVertex(esd);
176 //AliESDVertex *vertex = (AliESDVertex*)vertexer->FindPrimaryVertexOld(esd);
178 nc = (Int_t)vertex->GetNContributors();
179 printf("nc = %d\n",nc);
183 for(Int_t itrk=0; itrk<ntracks; itrk++) {
184 AliESDtrack *esdtrack = (AliESDtrack*)esd->GetTrack(itrk);
185 UInt_t status = esdtrack->GetStatus();
186 // only tracks found also in ITS
187 if(! (status&AliESDtrack::kITSin) ) continue;
189 Int_t npts = (Int_t)esdtrack->GetNcls(0);
190 if(npts==6) {nitstracks6++;nitstracks5or6++;}
191 if(npts==5) {nitstracks5++;nitstracks5or6++;}
192 if(npts==4) nitstracks4++;
193 if(npts==3) nitstracks3++;
194 if(npts==2) nitstracks2++;
195 if(npts==1) nitstracks1++;
196 TParticle *part = (TParticle*)gAlice->GetMCApp()->Particle(TMath::Abs(esdtrack->GetLabel()));
197 if(part->GetFirstMother()>=0) {
198 Int_t mpdg = TMath::Abs(gAlice->GetMCApp()->Particle(part->GetFirstMother())->GetPdgCode());
199 //cout<<TMath::Abs(esdtrack->GetLabel())<<" "<<mpdg<<endl;
200 if(mpdg==321||mpdg==311||mpdg==310||mpdg==3122||mpdg==3312||mpdg==3334) {
201 nitstracksFromStrange++;
202 if(npts>=5) nitstracksFromStrange5or6++;
206 printf("Number of kITSin tracks in ESD %d : %d\n",iev,nitstracks);
207 printf(" 6 pts: %d\n",nitstracks6);
208 printf(" 5 pts: %d\n",nitstracks5);
209 printf(" 4 pts: %d\n",nitstracks4);
210 printf(" 3 pts: %d\n",nitstracks3);
211 printf(" 2 pts: %d\n",nitstracks2);
212 printf(" 1 pts: %d\n",nitstracks1);
213 printf("Number of kITSin tracks from s: %d\n",nitstracksFromStrange);
218 vertex->GetSigmaXYZ(errvtx);
219 diffX = 10000.* (vtx[0] - truevtx[0]);
220 diffY = 10000.* (vtx[1] - truevtx[1]);
221 diffZ = 10000.* (vtx[2] - truevtx[2]);
225 diffXerr = diffX/errvtx[0]/10000.;
226 diffYerr = diffY/errvtx[1]/10000.;
227 diffZerr = diffZ/errvtx[2]/10000.;
228 hdiffXerr->Fill(diffXerr);
229 hdiffYerr->Fill(diffYerr);
230 hdiffZerr->Fill(diffZerr);
233 ntVtxRes->Fill(nitstracks,nitstracks5or6,nitstracksFromStrange,nitstracksFromStrange5or6,diffX,diffY,diffZ,diffXerr,diffYerr,diffZerr,multiplicity,(Float_t)nc);
235 } // END LOOP ON EVENTS
244 TFile *fout = new TFile(outname.Data(),"recreate");
256 //----------------------------------------------------------------------------
257 Double_t FitFunc(Double_t *x,Double_t *par) {
258 return par[0]+par[1]/TMath::Sqrt(x[0]);
260 Int_t GetBin(Float_t mult) {
261 if(mult<5.) return 0;
262 if(mult<7.) return 1;
263 if(mult<12.) return 2;
264 if(mult<15.) return 3;
265 if(mult<22.) return 4;
268 void PlotVtxRes(const Char_t *inname="AliVertexerTracksTest.root") {
269 //---------------------------------------------------------------------
270 // Plot efficiency, resolutions, pulls
271 // [at least 10k pp events are needed]
272 //---------------------------------------------------------------------
274 gStyle->SetOptStat(0);
275 gStyle->SetOptFit(10001);
280 Float_t nTrks,nTrksFromStrange,nTrks5or6,nTrksFromStrange5or6,dNchdy;
281 Float_t diffX,diffY,diffZ,diffXerr,diffYerr,diffZerr;
286 TH1F *hdx = new TH1F("hdx","",50,-600,600);
287 hdx->SetXTitle("#Delta x [#mu m]");
288 hdx->SetYTitle("events");
290 TH1F *hdy = new TH1F("hdy","",50,-600,600);
291 hdy->SetXTitle("#Delta y [#mu m]");
292 hdy->SetYTitle("events");
294 TH1F *hdz = new TH1F("hdz","",50,-600,600);
295 hdz->SetXTitle("#Delta z [#mu m]");
296 hdz->SetYTitle("events");
298 TH1F *hTracksVtx = new TH1F("hTracksVtx","events w/ vertex",51,-0.5,50.5);
299 hTracksVtx->SetXTitle("Number of reco tracks in TPC&ITS");
300 hTracksVtx->SetYTitle("events");
302 TH1F *hTracksNoVtx = new TH1F("hTracksNoVtx","events w/o vertex",51,-0.5,50.5);
303 hTracksNoVtx->SetXTitle("Number of reco tracks in TPC&ITS");
304 hTracksNoVtx->SetYTitle("events");
306 TH1F *hTracksVtx5or6 = new TH1F("hTracksVtx5or6","events w/ vertex",51,-0.5,50.5);
307 hTracksVtx5or6->SetXTitle("Number of reco tracks in TPC&ITS(pts>=5)");
308 hTracksVtx5or6->SetYTitle("events");
310 TH1F *hTracksNoVtx5or6 = new TH1F("hTracksNoVtx5or6","events w/o vertex",51,-0.5,50.5);
311 hTracksNoVtx5or6->SetXTitle("Number of reco tracks in TPC&ITS(pts>=5)");
312 hTracksNoVtx5or6->SetYTitle("events");
314 TH1F *hTracksVtx5or6nonS = new TH1F("hTracksVtx5or6nonS","events w/ vertex",51,-0.5,50.5);
315 hTracksVtx5or6nonS->SetXTitle("Number of reco tracks in TPC&ITS(pts>=5) NOT from s");
316 hTracksVtx5or6nonS->SetYTitle("events");
318 TH1F *hTracksNoVtx5or6nonS = new TH1F("hTracksNoVtx5or6nonS","events w/o vertex",51,-0.5,50.5);
319 hTracksNoVtx5or6nonS->SetXTitle("Number of reco tracks in TPC&ITS(pts>=5) NOT from s");
320 hTracksNoVtx5or6nonS->SetYTitle("events");
322 TH1F *hPullsx = new TH1F("hPullsx","",50,-7.,7.);
323 hPullsx->SetXTitle("#Delta x/#sqrt{<x,x>}");
324 hPullsx->SetYTitle("events");
326 TH1F *hPullsy = new TH1F("hPullsy","",50,-7.,7.);
327 hPullsy->SetXTitle("#Delta y/#sqrt{<y,y>}");
328 hPullsy->SetYTitle("events");
330 TH1F *hPullsz = new TH1F("hPullsz","",50,-7.,7.);
331 hPullsz->SetXTitle("#Delta z/#sqrt{<z,z>}");
332 hPullsz->SetYTitle("events");
335 Double_t mult[6]={0,0,0,0,0,0};
336 Double_t mult2[6]={0,0,0,0,0,0};
337 Double_t sigmamult[6]={0,0,0,0,0,0};
338 Double_t sigmamult2[6]={0,0,0,0,0,0};
339 Double_t tottracks[6]={0,0,0,0,0,0};
340 Double_t fittrks[6]={0,0,0,0,0,0};
341 Double_t tracks[6]={0,0,0,0,0,0};
342 Double_t etracks[6]={0,0,0,0,0,0};
343 Double_t xres[6]={0,0,0,0,0,0};
344 Double_t exres[6]={0,0,0,0,0,0};
345 Double_t yres[6]={0,0,0,0,0,0};
346 Double_t eyres[6]={0,0,0,0,0,0};
347 Double_t zres[6]={0,0,0,0,0,0};
348 Double_t ezres[6]={0,0,0,0,0,0};
349 Double_t xpull[6]={0,0,0,0,0,0};
350 Double_t expull[6]={0,0,0,0,0,0};
351 Double_t ypull[6]={0,0,0,0,0,0};
352 Double_t eypull[6]={0,0,0,0,0,0};
353 Double_t zpull[6]={0,0,0,0,0,0};
354 Double_t ezpull[6]={0,0,0,0,0,0};
355 Int_t evts[6]={0,0,0,0,0,0};
356 Int_t totevts[6]={0,0,0,0,0,0};
357 Int_t vtx[6]={0,0,0,0,0,0};
358 Int_t all[6]={0,0,0,0,0,0};
359 Double_t probVtx[6]={0,0,0,0,0,0};
360 Double_t eprobVtx[6]={0,0,0,0,0,0};
365 TH1F *hdx0 = new TH1F("hdx0","x resolution - bin 0",50,-500,500);
366 TH1F *hdx1 = new TH1F("hdx1","x resolution - bin 1",50,-500,500);
367 TH1F *hdx2 = new TH1F("hdx2","x resolution - bin 2",50,-500,500);
368 TH1F *hdx3 = new TH1F("hdx3","x resolution - bin 3",50,-400,400);
369 TH1F *hdx4 = new TH1F("hdx4","x resolution - bin 4",50,-300,300);
370 TH1F *hdx5 = new TH1F("hdx5","x resolution - bin 5",50,-300,300);
371 TH1F *hdy0 = new TH1F("hdy0","y resolution - bin 0",50,-500,500);
372 TH1F *hdy1 = new TH1F("hdy1","y resolution - bin 1",50,-500,500);
373 TH1F *hdy2 = new TH1F("hdy2","y resolution - bin 2",50,-500,500);
374 TH1F *hdy3 = new TH1F("hdy3","y resolution - bin 3",50,-400,400);
375 TH1F *hdy4 = new TH1F("hdy4","y resolution - bin 4",50,-300,300);
376 TH1F *hdy5 = new TH1F("hdy5","y resolution - bin 5",50,-300,300);
377 TH1F *hdz0 = new TH1F("hdz0","z resolution - bin 0",50,-1000,1000);
378 TH1F *hdz1 = new TH1F("hdz1","z resolution - bin 1",50,-800,800);
379 TH1F *hdz2 = new TH1F("hdz2","z resolution - bin 2",50,-800,800);
380 TH1F *hdz3 = new TH1F("hdz3","z resolution - bin 3",50,-600,600);
381 TH1F *hdz4 = new TH1F("hdz4","z resolution - bin 4",50,-500,500);
382 TH1F *hdz5 = new TH1F("hdz5","z resolution - bin 5",50,-500,500);
384 TH1F *hpx0 = new TH1F("hpx0","x pull - bin 0",50,-7,7);
385 TH1F *hpx1 = new TH1F("hpx1","x pull - bin 1",50,-7,7);
386 TH1F *hpx2 = new TH1F("hpx2","x pull - bin 2",50,-7,7);
387 TH1F *hpx3 = new TH1F("hpx3","x pull - bin 3",50,-7,7);
388 TH1F *hpx4 = new TH1F("hpx4","x pull - bin 4",50,-7,7);
389 TH1F *hpx5 = new TH1F("hpx5","x pull - bin 5",50,-7,7);
390 TH1F *hpy0 = new TH1F("hpy0","y pull - bin 0",50,-7,7);
391 TH1F *hpy1 = new TH1F("hpy1","y pull - bin 1",50,-7,7);
392 TH1F *hpy2 = new TH1F("hpy2","y pull - bin 2",50,-7,7);
393 TH1F *hpy3 = new TH1F("hpy3","y pull - bin 3",50,-7,7);
394 TH1F *hpy4 = new TH1F("hpy4","y pull - bin 4",50,-7,7);
395 TH1F *hpy5 = new TH1F("hpy5","y pull - bin 5",50,-7,7);
396 TH1F *hpz0 = new TH1F("hpz0","z pull - bin 0",50,-7,7);
397 TH1F *hpz1 = new TH1F("hpz1","z pull - bin 1",50,-7,7);
398 TH1F *hpz2 = new TH1F("hpz2","z pull - bin 2",50,-7,7);
399 TH1F *hpz3 = new TH1F("hpz3","z pull - bin 3",50,-7,7);
400 TH1F *hpz4 = new TH1F("hpz4","z pull - bin 4",50,-7,7);
401 TH1F *hpz5 = new TH1F("hpz5","z pull - bin 5",50,-7,7);
404 TH1F *hmult = new TH1F("hmult","hmult",50,-0.5,49.5);
406 TFile *in = new TFile(inname);
407 TNtuple *nt = (TNtuple*)in->Get("ntVtxRes");
408 nt->SetBranchAddress("ntracks",&nTrks);
409 nt->SetBranchAddress("nitstracks5or6",&nTrks5or6);
410 nt->SetBranchAddress("nitstracksFromStrange",&nTrksFromStrange);
411 nt->SetBranchAddress("nitstracksFromStrange5or6",&nTrksFromStrange5or6);
412 nt->SetBranchAddress("diffX",&diffX);
413 nt->SetBranchAddress("diffY",&diffY);
414 nt->SetBranchAddress("diffZ",&diffZ);
415 nt->SetBranchAddress("diffXerr",&diffXerr);
416 nt->SetBranchAddress("diffYerr",&diffYerr);
417 nt->SetBranchAddress("diffZerr",&diffZerr);
418 nt->SetBranchAddress("multiplicity",&dNchdy);
419 Int_t entries = (Int_t)nt->GetEntries();
422 for(Int_t i=0; i<entries; i++) {
423 nbytes += nt->GetEvent(i);
424 bin = GetBin(dNchdy);
428 if(diffX < 90000.) { // vtx found
430 mult2[bin] += dNchdy;
432 tottracks[bin] += nTrks;
434 if(bin==0) hdx0->Fill(diffX);
435 if(bin==1) hdx1->Fill(diffX);
436 if(bin==2) hdx2->Fill(diffX);
437 if(bin==3) hdx3->Fill(diffX);
438 if(bin==4) hdx4->Fill(diffX);
439 if(bin==5) hdx5->Fill(diffX);
440 if(bin==0) hdy0->Fill(diffY);
441 if(bin==1) hdy1->Fill(diffY);
442 if(bin==2) hdy2->Fill(diffY);
443 if(bin==3) hdy3->Fill(diffY);
444 if(bin==4) hdy4->Fill(diffY);
445 if(bin==5) hdy5->Fill(diffY);
446 if(bin==0) hdz0->Fill(diffZ);
447 if(bin==1) hdz1->Fill(diffZ);
448 if(bin==2) hdz2->Fill(diffZ);
449 if(bin==3) hdz3->Fill(diffZ);
450 if(bin==4) hdz4->Fill(diffZ);
451 if(bin==5) hdz5->Fill(diffZ);
455 hTracksVtx->Fill(nTrks);
456 hTracksVtx5or6->Fill(nTrks5or6);
457 hTracksVtx5or6nonS->Fill(nTrks5or6-nTrksFromStrange5or6);
458 hPullsx->Fill(diffXerr);
459 hPullsy->Fill(diffYerr);
460 hPullsz->Fill(diffZerr);
461 if(bin==0) hpx0->Fill(diffXerr);
462 if(bin==1) hpx1->Fill(diffXerr);
463 if(bin==2) hpx2->Fill(diffXerr);
464 if(bin==3) hpx3->Fill(diffXerr);
465 if(bin==4) hpx4->Fill(diffXerr);
466 if(bin==5) hpx5->Fill(diffXerr);
467 if(bin==0) hpy0->Fill(diffYerr);
468 if(bin==1) hpy1->Fill(diffYerr);
469 if(bin==2) hpy2->Fill(diffYerr);
470 if(bin==3) hpy3->Fill(diffYerr);
471 if(bin==4) hpy4->Fill(diffYerr);
472 if(bin==5) hpy5->Fill(diffYerr);
473 if(bin==0) hpz0->Fill(diffZerr);
474 if(bin==1) hpz1->Fill(diffZerr);
475 if(bin==2) hpz2->Fill(diffZerr);
476 if(bin==3) hpz3->Fill(diffZerr);
477 if(bin==4) hpz4->Fill(diffZerr);
478 if(bin==5) hpz5->Fill(diffZerr);
481 hTracksNoVtx->Fill(nTrks);
482 hTracksNoVtx5or6->Fill(nTrks5or6);
483 hTracksNoVtx5or6nonS->Fill(nTrks5or6-nTrksFromStrange5or6);
489 for(Int_t k=0;k<6;k++) {
491 mult[k] /= totevts[k];
492 tottracks[k] /= evts[k];
493 probVtx[k] = (Double_t)vtx[k]/all[k];
494 eprobVtx[k] = (Double_t)vtx[k]/all[k]/all[k]+(Double_t)vtx[k]*vtx[k]/all[k]/all[k]/all[k];
495 eprobVtx[k] = TMath::Sqrt(eprobVtx[k]);
498 // calculate spread in multiplicity
499 for(Int_t i=0; i<entries; i++) {
500 nbytes += nt->GetEvent(i);
501 bin = GetBin(dNchdy);
502 sigmamult[bin] += (dNchdy-mult[bin])*(dNchdy-mult[bin])/totevts[bin];
503 if(diffX < 90000.) sigmamult2[bin] += (dNchdy-mult2[bin])*(dNchdy-mult2[bin])/evts[bin];
506 for(Int_t k=0;k<6;k++) {
507 sigmamult[k] = TMath::Sqrt(sigmamult[k]);
508 sigmamult2[k] = TMath::Sqrt(sigmamult2[k]);
511 // fraction of found vertices
512 Float_t frac = (Float_t)nEvVtx/(nEvVtx+nEvNoVtx);
513 printf(" Fraction of events with vertex: %f\n",frac);
517 TF1 *g = new TF1("g","gaus");
519 TF1 *line = new TF1("line","pol1");
520 line->SetLineWidth(3);
521 TF1 *func = new TF1("func",FitFunc,2,35,2);
522 func->SetLineWidth(1);
524 Double_t x1,y1,sigmafit;
530 gStyle->SetOptFit(1111);
532 // Tracks in ITS for events w/ and w/o vertex
533 TCanvas *c1 = new TCanvas("c1","c1",0,0,1000,500);
538 hTracksNoVtx->Draw();
540 // probability vs ntracks
541 TCanvas *c1b = new TCanvas("c1b","c1b",0,0,500,500);
542 TH1F *hTotTracks = (TH1F*)hTracksVtx->Clone("hTotTracks");
543 hTotTracks->Add(hTracksNoVtx);
544 TH1F *hProbTracks = (TH1F*)hTracksVtx->Clone("hProbTracks");
545 hProbTracks->Divide(hTotTracks);
546 hProbTracks->SetYTitle("Probability");
547 hProbTracks->SetTitle("Probability to find the vertex");
550 TCanvas *c1c = new TCanvas("c1c","c1c",0,0,500,500);
551 TH1F *hTotTracks5or6 = (TH1F*)hTracksVtx5or6->Clone("hTotTracks5or6");
552 hTotTracks5or6->Add(hTracksNoVtx5or6);
553 TH1F *hProbTracks5or6 = (TH1F*)hTracksVtx5or6->Clone("hProbTracks5or6");
554 hProbTracks5or6->Divide(hTotTracks5or6);
555 hProbTracks5or6->SetYTitle("Probability");
556 hProbTracks5or6->SetTitle("Probability to find the vertex");
557 hProbTracks5or6->Draw();
559 TCanvas *c1d = new TCanvas("c1d","c1d",0,0,500,500);
560 TH1F *hTotTracks5or6nonS = (TH1F*)hTracksVtx5or6nonS->Clone("hTotTracks5or6nonS");
561 hTotTracks5or6nonS->Add(hTracksNoVtx5or6nonS);
562 TH1F *hProbTracks5or6nonS = (TH1F*)hTracksVtx5or6nonS->Clone("hProbTracks5or6nonS");
563 hProbTracks5or6nonS->Divide(hTotTracks5or6nonS);
564 hProbTracks5or6nonS->SetYTitle("Probability");
565 hProbTracks5or6nonS->SetTitle("Probability to find the vertex");
566 hProbTracks5or6nonS->Draw();
568 // Global resolutions
569 TCanvas *c2 = new TCanvas("c2","c2",0,0,1000,400);
573 g->SetRange(-1.*hdx->GetRMS(),+1.*hdx->GetRMS());
577 g->SetRange(-1.*hdy->GetRMS(),+1.*hdy->GetRMS());
581 g->SetRange(-1.*hdz->GetRMS(),+1.*hdz->GetRMS());
585 TCanvas *c4 = new TCanvas("c4","c4",0,0,1000,400);
589 g->SetRange(-3.*hPullsx->GetRMS(),+3.*hPullsx->GetRMS());
590 hPullsx->Fit("g","R");
593 g->SetRange(-3.*hPullsy->GetRMS(),+3.*hPullsy->GetRMS());
594 hPullsy->Fit("g","R");
597 g->SetRange(-3.*hPullsz->GetRMS(),+3.*hPullsz->GetRMS());
598 hPullsz->Fit("g","R");
600 // probability VS multiplicity
601 TCanvas *c5 = new TCanvas("c5","c5",0,0,600,500);
602 TH2F *fr5 = new TH2F("fr5","",2,0,35,2,0,1.1);
603 fr5->SetXTitle("dN_{ch}/dy");
604 fr5->SetYTitle("Probability");
606 TGraphErrors *gr5 = new TGraphErrors(6,mult,probVtx,sigmamult,eprobVtx);
608 gr5->SetMarkerStyle(21);
611 // resolutions VS multiplicity
614 TCanvas *ax = new TCanvas("ax","ax",0,0,900,700);
618 g->SetRange(-3.*hdx0->GetRMS(),+3.*hdx0->GetRMS());
620 xres[0]=g->GetParameter(2);
621 exres[0]=g->GetParError(2);
624 g->SetRange(-3.*hdx1->GetRMS(),+3.*hdx1->GetRMS());
626 xres[1]=g->GetParameter(2);
627 exres[1]=g->GetParError(2);
630 g->SetRange(-3.*hdx2->GetRMS(),+3.*hdx2->GetRMS());
632 xres[2]=g->GetParameter(2);
633 exres[2]=g->GetParError(2);
636 g->SetRange(-3.*hdx3->GetRMS(),+3.*hdx3->GetRMS());
638 xres[3]=g->GetParameter(2);
639 exres[3]=g->GetParError(2);
642 g->SetRange(-3.*hdx4->GetRMS(),+3.*hdx4->GetRMS());
644 xres[4]=g->GetParameter(2);
645 exres[4]=g->GetParError(2);
648 g->SetRange(-3.*hdx5->GetRMS(),+3.*hdx5->GetRMS());
650 xres[5]=g->GetParameter(2);
651 exres[5]=g->GetParError(2);
653 TCanvas *ay = new TCanvas("ay","ay",0,0,900,700);
657 g->SetRange(-3.*hdy0->GetRMS(),+3.*hdy0->GetRMS());
659 yres[0]=g->GetParameter(2);
660 eyres[0]=g->GetParError(2);
663 g->SetRange(-3.*hdy1->GetRMS(),+3.*hdy1->GetRMS());
665 yres[1]=g->GetParameter(2);
666 eyres[1]=g->GetParError(2);
669 g->SetRange(-3.*hdy2->GetRMS(),+3.*hdy2->GetRMS());
671 yres[2]=g->GetParameter(2);
672 eyres[2]=g->GetParError(2);
675 g->SetRange(-3.*hdy3->GetRMS(),+3.*hdy3->GetRMS());
677 yres[3]=g->GetParameter(2);
678 eyres[3]=g->GetParError(2);
681 g->SetRange(-3.*hdy4->GetRMS(),+3.*hdy4->GetRMS());
683 yres[4]=g->GetParameter(2);
684 eyres[4]=g->GetParError(2);
687 g->SetRange(-3.*hdy5->GetRMS(),+3.*hdy5->GetRMS());
689 yres[5]=g->GetParameter(2);
690 eyres[5]=g->GetParError(2);
692 TCanvas *az = new TCanvas("az","az",0,0,900,700);
696 g->SetRange(-3.*hdz0->GetRMS(),+3.*hdz0->GetRMS());
698 zres[0]=g->GetParameter(2);
699 ezres[0]=g->GetParError(2);
702 g->SetRange(-3.*hdz1->GetRMS(),+3.*hdz1->GetRMS());
704 zres[1]=g->GetParameter(2);
705 ezres[1]=g->GetParError(2);
708 g->SetRange(-3.*hdz2->GetRMS(),+3.*hdz2->GetRMS());
710 zres[2]=g->GetParameter(2);
711 ezres[2]=g->GetParError(2);
714 g->SetRange(-3.*hdz3->GetRMS(),+3.*hdz3->GetRMS());
716 zres[3]=g->GetParameter(2);
717 ezres[3]=g->GetParError(2);
720 g->SetRange(-3.*hdz4->GetRMS(),+3.*hdz4->GetRMS());
722 zres[4]=g->GetParameter(2);
723 ezres[4]=g->GetParError(2);
726 g->SetRange(-3.*hdz5->GetRMS(),+3.*hdz5->GetRMS());
728 zres[5]=g->GetParameter(2);
729 ezres[5]=g->GetParError(2);
733 // pulls VS multiplicity
736 TCanvas *bx = new TCanvas("bx","bx",0,0,900,700);
740 g->SetRange(-3.*hpx0->GetRMS(),+3.*hpx0->GetRMS());
742 xpull[0]=g->GetParameter(2);
743 expull[0]=g->GetParError(2);
746 g->SetRange(-3.*hpx1->GetRMS(),+3.*hpx1->GetRMS());
748 xpull[1]=g->GetParameter(2);
749 expull[1]=g->GetParError(2);
752 g->SetRange(-3.*hpx2->GetRMS(),+3.*hpx2->GetRMS());
754 xpull[2]=g->GetParameter(2);
755 expull[2]=g->GetParError(2);
758 g->SetRange(-3.*hpx3->GetRMS(),+3.*hpx3->GetRMS());
760 xpull[3]=g->GetParameter(2);
761 expull[3]=g->GetParError(2);
764 g->SetRange(-3.*hpx4->GetRMS(),+3.*hpx4->GetRMS());
766 xpull[4]=g->GetParameter(2);
767 expull[4]=g->GetParError(2);
770 g->SetRange(-3.*hpx5->GetRMS(),+3.*hpx5->GetRMS());
772 xpull[5]=g->GetParameter(2);
773 expull[5]=g->GetParError(2);
775 TCanvas *by = new TCanvas("by","by",0,0,900,700);
779 g->SetRange(-3.*hpy0->GetRMS(),+3.*hpy0->GetRMS());
781 ypull[0]=g->GetParameter(2);
782 eypull[0]=g->GetParError(2);
785 g->SetRange(-3.*hpy1->GetRMS(),+3.*hpy1->GetRMS());
787 ypull[1]=g->GetParameter(2);
788 eypull[1]=g->GetParError(2);
791 g->SetRange(-3.*hpy2->GetRMS(),+3.*hpy2->GetRMS());
793 ypull[2]=g->GetParameter(2);
794 eypull[2]=g->GetParError(2);
797 g->SetRange(-3.*hpy3->GetRMS(),+3.*hpy3->GetRMS());
799 ypull[3]=g->GetParameter(2);
800 eypull[3]=g->GetParError(2);
803 g->SetRange(-3.*hpy4->GetRMS(),+3.*hpy4->GetRMS());
805 ypull[4]=g->GetParameter(2);
806 eypull[4]=g->GetParError(2);
809 g->SetRange(-3.*hpy5->GetRMS(),+3.*hpy5->GetRMS());
811 ypull[5]=g->GetParameter(2);
812 eypull[5]=g->GetParError(2);
814 TCanvas *bz = new TCanvas("bz","bz",0,0,900,700);
818 g->SetRange(-3.*hpz0->GetRMS(),+3.*hpz0->GetRMS());
820 zpull[0]=g->GetParameter(2);
821 ezpull[0]=g->GetParError(2);
824 g->SetRange(-3.*hpz1->GetRMS(),+3.*hpz1->GetRMS());
826 zpull[1]=g->GetParameter(2);
827 ezpull[1]=g->GetParError(2);
830 g->SetRange(-3.*hpz2->GetRMS(),+3.*hpz2->GetRMS());
832 zpull[2]=g->GetParameter(2);
833 ezpull[2]=g->GetParError(2);
836 g->SetRange(-3.*hpz3->GetRMS(),+3.*hpz3->GetRMS());
838 zpull[3]=g->GetParameter(2);
839 ezpull[3]=g->GetParError(2);
842 g->SetRange(-3.*hpz4->GetRMS(),+3.*hpz4->GetRMS());
844 zpull[4]=g->GetParameter(2);
845 ezpull[4]=g->GetParError(2);
848 g->SetRange(-3.*hpz5->GetRMS(),+3.*hpz5->GetRMS());
850 zpull[5]=g->GetParameter(2);
851 ezpull[5]=g->GetParError(2);
853 gStyle->SetOptFit(0);
856 TCanvas *c6 = new TCanvas("c6","c6",0,0,600,500);
857 TH2F *fr6 = new TH2F("fr6","",2,0,35,2,0,200);
858 fr6->SetXTitle("dN_{ch}/dy");
859 fr6->SetYTitle("#sigma [#mu m]");
861 sigmamult2[0]=sigmamult2[1]=sigmamult2[2]=sigmamult2[3]=sigmamult2[4]=sigmamult2[5]=0.;
862 TGraphErrors *gr6x = new TGraphErrors(6,mult2,xres,sigmamult2,exres);
864 gr6x->SetMarkerStyle(22);
865 gr6x->Fit("func","E,R");
866 TGraphErrors *gr6z = new TGraphErrors(6,mult2,zres,sigmamult2,ezres);
868 gr6z->SetMarkerStyle(26);
869 gr6z->Fit("func","E,R");
870 TLegend *leg6 = new TLegend(0.6,0.75,0.9,0.9);
871 leg6->AddEntry(gr6x,"x/y coordinate","p");
872 leg6->AddEntry(gr6z,"z coordinate","p");
873 leg6->SetFillStyle(0);
874 leg6->SetBorderSize(0);
878 TCanvas *c8 = new TCanvas("c8","c8",0,0,600,500);
879 TH2F *fr8 = new TH2F("fr8","",2,0,35,2,0,2.);
880 fr8->SetXTitle("dN_{ch}/dy");
881 fr8->SetYTitle("pull");
883 TGraphErrors *gr8x = new TGraphErrors(6,mult2,xpull,sigmamult2,expull);
885 gr8x->SetMarkerStyle(22);
886 TGraphErrors *gr8z = new TGraphErrors(6,mult2,zpull,sigmamult2,ezpull);
888 gr8z->SetMarkerStyle(26);
889 TLegend *leg8 = new TLegend(0.6,0.75,0.9,0.9);
890 leg8->AddEntry(gr6x,"x/y coordinate","p");
891 leg8->AddEntry(gr6z,"z coordinate","p");
892 leg8->SetFillStyle(0);
893 leg8->SetBorderSize(0);
895 TLine *l8 = new TLine(0,1,35,1);
901 //----------------------------------------------------------------------------
902 void AliComputeVtxMeanFromESD(TString file="AliESDs.root",
904 //-----------------------------------------------------------------------
905 // Compute weighted mean and cov. matrix from a set of AliESD
906 //-----------------------------------------------------------------------
908 gStyle->SetOptStat(0);
909 //gStyle->SetOptFit(0);
912 Double_t vtx[3],covvtx[6];
915 AliESDVertex *vertex = 0;
917 Int_t nc,events,total=0;
938 Double_t eavx,eavy,eavz,ewgtavx,ewgtavy,ewgtavz;
940 TH1F* hx = new TH1F("hx","",200,-1000,1000);
941 hx->SetXTitle("vertex x [#mu m]");
942 hx->SetYTitle("events");
943 TH1F* hy = new TH1F("hy","",200,-1000,1000);
944 hy->SetXTitle("vertex y [#mu m]");
945 hy->SetYTitle("events");
946 TH1F* hz = new TH1F("hz","",200,-10,10);
947 hz->SetXTitle("vertex z [cm]");
948 hz->SetYTitle("events");
951 for(Int_t i=1; i<100; i++) {
952 TString inname="event.";
955 inname.Append(file.Data());
956 if(gSystem->AccessPathName(inname.Data())) continue;
957 TFile *fin = TFile::Open(inname.Data());
958 esdTree = (TTree*)fin->Get("esdTree");
959 if(!esdTree) continue;
960 esdTree->SetBranchAddress("ESD",&esd);
961 events = esdTree->GetEntries();
962 printf("Number of events in ESD tree: %d\n",events);
965 for(Int_t iev=0; iev<events; iev++) { //LOOP ON EVENTS
966 esdTree->GetEvent(iev);
967 vertex = (AliESDVertex*)esd->GetPrimaryVertex();
968 if(!vertex) continue;
969 nc = vertex->GetNContributors();
970 if(nc<mincontr) continue;
972 vertex->GetSigmaXYZ(errvtx);
973 //printf("%f %f %f %f %f %f\n",vtx[0],vtx[1],vtx[2],errvtx[0],errvtx[1],errvtx[2]);
979 wgtavx += vtx[0]/errvtx[0]/errvtx[0];
980 wgtavy += vtx[1]/errvtx[1]/errvtx[1];
981 wgtavz += vtx[2]/errvtx[2]/errvtx[2];
982 sumwgtx += 1./errvtx[0]/errvtx[0];
983 sumwgty += 1./errvtx[1]/errvtx[1];
984 sumwgtz += 1./errvtx[2]/errvtx[2];
986 hx->Fill(1e4*vtx[0]);
987 hy->Fill(1e4*vtx[1]);
1003 ewgtavx = 1./TMath::Sqrt(sumwgtx);
1004 ewgtavy = 1./TMath::Sqrt(sumwgty);
1005 ewgtavz = 1./TMath::Sqrt(sumwgtz);
1008 for(Int_t i=1; i<100; i++) {
1009 TString inname="event.";
1012 inname.Append(file.Data());
1013 if(gSystem->AccessPathName(inname.Data())) continue;
1014 TFile *fin = TFile::Open(inname.Data());
1015 esdTree = (TTree*)fin->Get("esdTree");
1016 if(!esdTree) continue;
1017 esdTree->SetBranchAddress("ESD",&esd);
1018 events = esdTree->GetEntries();
1019 for(Int_t iev=0; iev<events; iev++) { //LOOP ON EVENTS
1020 esdTree->GetEvent(iev);
1021 vertex = (AliESDVertex*)esd->GetPrimaryVertex();
1022 if(!vertex) continue;
1023 nc = vertex->GetNContributors();
1024 if(nc<mincontr) continue;
1025 vertex->GetXYZ(vtx);
1026 vertex->GetSigmaXYZ(errvtx);
1028 varx += (vtx[0]-avx)*(vtx[0]-avx);
1029 vary += (vtx[1]-avy)*(vtx[1]-avy);
1030 varz += (vtx[2]-avz)*(vtx[2]-avz);
1031 covxy += (vtx[0]-avx)*(vtx[1]-avy);
1032 covxz += (vtx[0]-avx)*(vtx[2]-avz);
1033 covyz += (vtx[1]-avy)*(vtx[2]-avz);
1045 rmsx = TMath::Sqrt(varx);
1046 rmsy = TMath::Sqrt(vary);
1047 rmsz = TMath::Sqrt(varz);
1048 eavx = rmsx/TMath::Sqrt(sum);
1049 eavy = rmsy/TMath::Sqrt(sum);
1050 eavz = rmsz/TMath::Sqrt(sum);
1053 printf("\n\nNumber of events: Total %d, Used %d\n",total,sum);
1054 printf("Average:\n x = (%f +- %f) mum\n y = (%f +- %f) mum\n z = (%f +- %f) mu\n",1e4*avx,1e4*eavx,1e4*avy,1e4*eavy,1e4*avz,1e4*eavz);
1055 printf("Weighted Average:\n x = (%f +- %f) mum\n y = (%f +- %f) mum\n z = (%f +- %f) mum\n",1e4*wgtavx,1e4*ewgtavx,1e4*wgtavy,1e4*ewgtavy,1e4*wgtavz,1e4*ewgtavz);
1056 printf("RMS:\n x = %f mum\n y = %f mum\n z = %f mum\n",1e4*rmsx,1e4*rmsy,1e4*rmsz);
1058 TCanvas *c = new TCanvas("c","c",0,0,1000,500);
1062 TF1 *gx = new TF1("gx","gaus",-1000,1000);
1063 gx->SetLineColor(2);
1065 TF1 *gxx = (TF1*)gx->Clone("gxx");
1066 gxx->FixParameter(2,50.);
1067 gxx->SetLineStyle(2);
1071 TF1 *gy = new TF1("gy","gaus",-1000,1000);
1072 gy->SetLineColor(2);
1074 TF1 *gyy = (TF1*)gy->Clone("gyy");
1075 gyy->FixParameter(2,50.);
1076 gyy->SetLineStyle(2);
1080 TF1 *gz = new TF1("gz","gaus",-10,10);
1081 gz->SetLineColor(2);
1083 TF1 *gzz = (TF1*)gz->Clone("gzz");
1084 gzz->FixParameter(2,5.3);
1085 gzz->SetLineStyle(2);
1097 AliESDVertex *vtxmean = new AliESDVertex(vtx,covvtx,0.,(Int_t)sum);
1098 vtxmean->SetTitle("Vertex from weighted average");
1099 TFile *out = new TFile("AliESDVertexMean.root","recreate");
1100 vtxmean->Write("vtxmean");
1105 //----------------------------------------------------------------------------
1106 void AliComputeVtxMeanFromTree(TString file="AliESDVertices.root",
1107 Int_t mincontr=20) {
1108 //-----------------------------------------------------------------------
1109 // Compute weighted mean and cov. matrix from a set of AliESDVertices
1110 //-----------------------------------------------------------------------
1111 gStyle->SetOptStat(0);
1112 //gStyle->SetOptFit(0);
1115 Double_t vtx[3],covvtx[6];
1126 Double_t sumwgtx=0.;
1127 Double_t sumwgty=0.;
1128 Double_t sumwgtz=0.;
1132 Double_t eavx,eavy,eavz,ewgtavx,ewgtavy,ewgtavz;
1134 TH1F* hx = new TH1F("hx","",200,-1000,1000);
1135 hx->SetXTitle("vertex x [#mu m]");
1136 hx->SetYTitle("events");
1137 TH1F* hy = new TH1F("hy","",200,-1000,1000);
1138 hy->SetXTitle("vertex y [#mu m]");
1139 hy->SetYTitle("events");
1140 TH1F* hz = new TH1F("hz","",200,-10,10);
1141 hz->SetXTitle("vertex z [cm]");
1142 hz->SetYTitle("events");
1145 if(gSystem->AccessPathName(file.Data())) continue;
1146 TFile *fin = TFile::Open(file.Data());
1147 TTree *tree = (TTree*)fin->Get("TreeV");
1148 AliESDVertex *vertex = 0;
1149 tree->SetBranchAddress("AliESDVertex",&vertex);
1150 Int_t entries = (Int_t)tree->GetEntries();
1152 for(Int_t i=0; i<entries; i++) {
1155 nc = vertex->GetNContributors();
1156 if(nc<mincontr) continue;
1157 vertex->GetXYZ(vtx);
1158 vertex->GetSigmaXYZ(errvtx);
1159 //printf("%f %f %f %f %f %f\n",vtx[0],vtx[1],vtx[2],errvtx[0],errvtx[1],errvtx[2]);
1165 wgtavx += vtx[0]/errvtx[0]/errvtx[0];
1166 wgtavy += vtx[1]/errvtx[1]/errvtx[1];
1167 wgtavz += vtx[2]/errvtx[2]/errvtx[2];
1168 sumwgtx += 1./errvtx[0]/errvtx[0];
1169 sumwgty += 1./errvtx[1]/errvtx[1];
1170 sumwgtz += 1./errvtx[2]/errvtx[2];
1172 hx->Fill(1e4*vtx[0]);
1173 hy->Fill(1e4*vtx[1]);
1185 ewgtavx = 1./TMath::Sqrt(sumwgtx);
1186 ewgtavy = 1./TMath::Sqrt(sumwgty);
1187 ewgtavz = 1./TMath::Sqrt(sumwgtz);
1190 for(Int_t i=0; i<entries; i++) {
1192 nc = vertex->GetNContributors();
1193 if(nc<mincontr) continue;
1194 vertex->GetXYZ(vtx);
1195 vertex->GetSigmaXYZ(errvtx);
1197 varx += (vtx[0]-avx)*(vtx[0]-avx);
1198 vary += (vtx[1]-avy)*(vtx[1]-avy);
1199 varz += (vtx[2]-avz)*(vtx[2]-avz);
1200 covxy += (vtx[0]-avx)*(vtx[1]-avy);
1201 covxz += (vtx[0]-avx)*(vtx[2]-avz);
1202 covyz += (vtx[1]-avy)*(vtx[2]-avz);
1213 rmsx = TMath::Sqrt(varx);
1214 rmsy = TMath::Sqrt(vary);
1215 rmsz = TMath::Sqrt(varz);
1216 eavx = rmsx/TMath::Sqrt(sum);
1217 eavy = rmsy/TMath::Sqrt(sum);
1218 eavz = rmsz/TMath::Sqrt(sum);
1221 printf("\n\nNumber of events: Total %d, Used %d\n",total,sum);
1222 printf("Average:\n x = (%f +- %f) mum\n y = (%f +- %f) mum\n z = (%f +- %f) mu\n",1e4*avx,1e4*eavx,1e4*avy,1e4*eavy,1e4*avz,1e4*eavz);
1223 printf("Weighted Average:\n x = (%f +- %f) mum\n y = (%f +- %f) mum\n z = (%f +- %f) mum\n",1e4*wgtavx,1e4*ewgtavx,1e4*wgtavy,1e4*ewgtavy,1e4*wgtavz,1e4*ewgtavz);
1224 printf("RMS:\n x = %f mum\n y = %f mum\n z = %f mum\n",1e4*rmsx,1e4*rmsy,1e4*rmsz);
1226 TCanvas *c = new TCanvas("c","c",0,0,1000,500);
1230 TF1 *gx = new TF1("gx","gaus",-1000,1000);
1231 gx->SetLineColor(2);
1233 TF1 *gxx = (TF1*)gx->Clone("gxx");
1234 gxx->FixParameter(2,50.);
1235 gxx->SetLineStyle(2);
1239 TF1 *gy = new TF1("gy","gaus",-1000,1000);
1240 gy->SetLineColor(2);
1242 TF1 *gyy = (TF1*)gy->Clone("gyy");
1243 gyy->FixParameter(2,50.);
1244 gyy->SetLineStyle(2);
1248 TF1 *gz = new TF1("gz","gaus",-10,10);
1249 gz->SetLineColor(2);
1251 TF1 *gzz = (TF1*)gz->Clone("gzz");
1252 gzz->FixParameter(2,5.3);
1253 gzz->SetLineStyle(2);
1265 AliESDVertex *vtxmean = new AliESDVertex(vtx,covvtx,0.,(Int_t)sum);
1266 vtxmean->SetTitle("Vertex from weighted average");
1267 TFile *out = new TFile("AliESDVertexMean.root","recreate");
1268 vtxmean->Write("vtxmean");
1273 //---------------------------------------------------------------------------