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2d57349e | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-2003, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
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 | **************************************************************************/ | |
15 | ||
16 | //----------------------------------------------------------------- | |
6d8df534 | 17 | // Implementation of the vertexer from tracks |
2d57349e | 18 | // |
19 | // Origin: AliITSVertexerTracks | |
20 | // A.Dainese, Padova, | |
21 | // andrea.dainese@pd.infn.it | |
22 | // M.Masera, Torino, | |
23 | // massimo.masera@to.infn.it | |
24 | // Moved to STEER and adapted to ESD tracks: | |
6d8df534 | 25 | // F.Prino, Torino, prino@to.infn.it |
2d57349e | 26 | //----------------------------------------------------------------- |
27 | ||
28 | //---- Root headers -------- | |
a7ede274 | 29 | #include <TSystem.h> |
30 | #include <TDirectory.h> | |
31 | #include <TFile.h> | |
2d57349e | 32 | #include <TTree.h> |
ec1be5d5 | 33 | #include <TMatrixD.h> |
2d57349e | 34 | //---- AliRoot headers ----- |
919e537f | 35 | #include "AliLog.h" |
2d57349e | 36 | #include "AliStrLine.h" |
6d8df534 | 37 | #include "AliExternalTrackParam.h" |
2258e165 | 38 | #include "AliNeutralTrackParam.h" |
0aa2faf4 | 39 | #include "AliVEvent.h" |
40 | #include "AliVTrack.h" | |
af885e0f | 41 | #include "AliESDEvent.h" |
2d57349e | 42 | #include "AliESDtrack.h" |
6d8df534 | 43 | #include "AliVertexerTracks.h" |
2d57349e | 44 | |
45 | ClassImp(AliVertexerTracks) | |
46 | ||
47 | ||
48 | //---------------------------------------------------------------------------- | |
49 | AliVertexerTracks::AliVertexerTracks(): | |
07680cae | 50 | TObject(), |
51 | fVert(), | |
52 | fCurrentVertex(0), | |
f09c879d | 53 | fMode(0), |
dc3719f3 | 54 | fFieldkG(-999.), |
6d8df534 | 55 | fTrkArraySel(), |
56 | fIdSel(0), | |
07680cae | 57 | fTrksToSkip(0), |
58 | fNTrksToSkip(0), | |
f09c879d | 59 | fConstraint(kFALSE), |
60 | fOnlyFitter(kFALSE), | |
61 | fMinTracks(1), | |
6b29d399 | 62 | fMinClusters(5), |
f09c879d | 63 | fDCAcut(0.1), |
64 | fDCAcutIter0(0.1), | |
65 | fNSigma(3.), | |
fee9ef0d | 66 | fMaxd0z0(0.5), |
f09c879d | 67 | fMinDetFitter(100.), |
68 | fMaxTgl(1000.), | |
50ff0bcd | 69 | fITSrefit(kTRUE), |
40cfa14d | 70 | fITSpureSA(kFALSE), |
6b29d399 | 71 | fFiducialR(3.), |
72 | fFiducialZ(30.), | |
3b768a1d | 73 | fnSigmaForUi00(1.5), |
8c75f668 | 74 | fAlgo(1), |
75 | fAlgoIter0(4) | |
2d57349e | 76 | { |
77 | // | |
78 | // Default constructor | |
79 | // | |
3b768a1d | 80 | SetVtxStart(); |
07680cae | 81 | SetVtxStartSigma(); |
2d57349e | 82 | } |
dc3719f3 | 83 | //---------------------------------------------------------------------------- |
84 | AliVertexerTracks::AliVertexerTracks(Double_t fieldkG): | |
07680cae | 85 | TObject(), |
86 | fVert(), | |
87 | fCurrentVertex(0), | |
f09c879d | 88 | fMode(0), |
89 | fFieldkG(fieldkG), | |
6d8df534 | 90 | fTrkArraySel(), |
91 | fIdSel(0), | |
07680cae | 92 | fTrksToSkip(0), |
93 | fNTrksToSkip(0), | |
f09c879d | 94 | fConstraint(kFALSE), |
95 | fOnlyFitter(kFALSE), | |
96 | fMinTracks(1), | |
6b29d399 | 97 | fMinClusters(5), |
f09c879d | 98 | fDCAcut(0.1), |
99 | fDCAcutIter0(0.1), | |
100 | fNSigma(3.), | |
fee9ef0d | 101 | fMaxd0z0(0.5), |
f09c879d | 102 | fMinDetFitter(100.), |
103 | fMaxTgl(1000.), | |
50ff0bcd | 104 | fITSrefit(kTRUE), |
40cfa14d | 105 | fITSpureSA(kFALSE), |
6b29d399 | 106 | fFiducialR(3.), |
107 | fFiducialZ(30.), | |
3b768a1d | 108 | fnSigmaForUi00(1.5), |
8c75f668 | 109 | fAlgo(1), |
110 | fAlgoIter0(4) | |
2d57349e | 111 | { |
112 | // | |
113 | // Standard constructor | |
114 | // | |
3b768a1d | 115 | SetVtxStart(); |
07680cae | 116 | SetVtxStartSigma(); |
2d57349e | 117 | } |
118 | //----------------------------------------------------------------------------- | |
fee9ef0d | 119 | AliVertexerTracks::~AliVertexerTracks() |
120 | { | |
2d57349e | 121 | // Default Destructor |
eae1677e | 122 | // The objects pointed by the following pointer are not owned |
2d57349e | 123 | // by this class and are not deleted |
ec1be5d5 | 124 | fCurrentVertex = 0; |
44a76311 | 125 | if(fTrksToSkip) { delete fTrksToSkip; fTrksToSkip=NULL; } |
126 | if(fIdSel) { delete fIdSel; fIdSel=NULL; } | |
ec1be5d5 | 127 | } |
c5e3e5d1 | 128 | //---------------------------------------------------------------------------- |
4448efe4 | 129 | AliESDVertex* AliVertexerTracks::FindPrimaryVertex(AliVEvent *vEvent) |
ec1be5d5 | 130 | { |
c5e3e5d1 | 131 | // |
0aa2faf4 | 132 | // Primary vertex for current ESD or AOD event |
eae1677e | 133 | // (Two iterations: |
fee9ef0d | 134 | // 1st with 5*fNSigma*sigma cut w.r.t. to initial vertex |
135 | // + cut on sqrt(d0d0+z0z0) if fConstraint=kFALSE | |
136 | // 2nd with fNSigma*sigma cut w.r.t. to vertex found in 1st iteration) | |
07680cae | 137 | // |
138 | fCurrentVertex = 0; | |
139 | ||
0aa2faf4 | 140 | TString evtype = vEvent->IsA()->GetName(); |
141 | Bool_t inputAOD = ((evtype=="AliAODEvent") ? kTRUE : kFALSE); | |
142 | ||
143 | if(inputAOD && fMode==1) { | |
144 | printf("Error : AliVertexerTracks: no TPC-only vertex from AOD\n"); | |
145 | TooFewTracks(); | |
146 | return fCurrentVertex; | |
147 | } | |
148 | ||
dc3719f3 | 149 | // accept 1-track case only if constraint is available |
150 | if(!fConstraint && fMinTracks==1) fMinTracks=2; | |
151 | ||
0aa2faf4 | 152 | // read tracks from AlivEvent |
153 | Int_t nTrks = (Int_t)vEvent->GetNumberOfTracks(); | |
f09c879d | 154 | if(nTrks<fMinTracks) { |
6d8df534 | 155 | TooFewTracks(); |
80d36431 | 156 | return fCurrentVertex; |
157 | } | |
6d8df534 | 158 | // |
713e5fbf | 159 | |
a7ede274 | 160 | TDirectory * olddir = gDirectory; |
f09c879d | 161 | TFile *f = 0; |
162 | if(nTrks>500) f = new TFile("VertexerTracks.root","recreate"); | |
6d8df534 | 163 | TObjArray trkArrayOrig(nTrks); |
164 | UShort_t *idOrig = new UShort_t[nTrks]; | |
07680cae | 165 | |
6d8df534 | 166 | Int_t nTrksOrig=0; |
f09c879d | 167 | AliExternalTrackParam *t=0; |
0aa2faf4 | 168 | // loop on tracks |
6d8df534 | 169 | for(Int_t i=0; i<nTrks; i++) { |
0aa2faf4 | 170 | AliVTrack *track = (AliVTrack*)vEvent->GetTrack(i); |
4539449a | 171 | // check tracks to skip |
172 | Bool_t skipThis = kFALSE; | |
173 | for(Int_t j=0; j<fNTrksToSkip; j++) { | |
174 | if(track->GetID()==fTrksToSkip[j]) { | |
175 | AliDebug(1,Form("skipping track: %d",i)); | |
176 | skipThis = kTRUE; | |
177 | } | |
178 | } | |
179 | if(skipThis) continue; | |
0aa2faf4 | 180 | |
40cfa14d | 181 | // skip pure ITS SA tracks (default) |
182 | if(!fITSpureSA && (track->GetStatus()&AliESDtrack::kITSpureSA)) continue; | |
183 | // or use only pure ITS SA tracks | |
184 | if(fITSpureSA && !(track->GetStatus()&AliESDtrack::kITSpureSA)) continue; | |
71d7871c | 185 | |
02bb7b6c | 186 | // kITSrefit |
187 | if(fMode==0 && fITSrefit && !(track->GetStatus()&AliESDtrack::kITSrefit)) continue; | |
188 | ||
4539449a | 189 | if(!inputAOD) { // ESD |
0aa2faf4 | 190 | AliESDtrack* esdt = (AliESDtrack*)track; |
191 | if(esdt->GetNcls(fMode) < fMinClusters) continue; | |
4539449a | 192 | if(fMode==0) { // ITS mode |
4539449a | 193 | Double_t x,p[5],cov[15]; |
194 | esdt->GetExternalParameters(x,p); | |
195 | esdt->GetExternalCovariance(cov); | |
196 | t = new AliExternalTrackParam(x,esdt->GetAlpha(),p,cov); | |
197 | } else if(fMode==1) { // TPC mode | |
198 | t = (AliExternalTrackParam*)esdt->GetTPCInnerParam(); | |
199 | if(!t) continue; | |
200 | Double_t radius = 2.8; //something less than the beam pipe radius | |
201 | if(!PropagateTrackTo(t,radius)) continue; | |
202 | } | |
203 | } else { // AOD (only ITS mode) | |
204 | Int_t ncls0=0; | |
205 | for(Int_t l=0;l<6;l++) if(TESTBIT(track->GetITSClusterMap(),l)) ncls0++; | |
206 | if(ncls0 < fMinClusters) continue; | |
0aa2faf4 | 207 | t = new AliExternalTrackParam(track); |
50ff0bcd | 208 | } |
6d8df534 | 209 | trkArrayOrig.AddLast(t); |
0aa2faf4 | 210 | idOrig[nTrksOrig]=(UShort_t)track->GetID(); |
6d8df534 | 211 | nTrksOrig++; |
0aa2faf4 | 212 | } // end loop on tracks |
fee9ef0d | 213 | |
f09c879d | 214 | // call method that will reconstruct the vertex |
6d8df534 | 215 | FindPrimaryVertex(&trkArrayOrig,idOrig); |
216 | ||
4539449a | 217 | if(fMode==0) trkArrayOrig.Delete(); |
44a76311 | 218 | delete idOrig; idOrig=NULL; |
f09c879d | 219 | |
220 | if(f) { | |
221 | f->Close(); delete f; f = NULL; | |
222 | gSystem->Unlink("VertexerTracks.root"); | |
223 | olddir->cd(); | |
224 | } | |
6d8df534 | 225 | |
4448efe4 | 226 | // set vertex ID for tracks used in the fit |
227 | // (only for ESD) | |
228 | if(!inputAOD) { | |
229 | Int_t nIndices = fCurrentVertex->GetNIndices(); | |
230 | UShort_t *indices = fCurrentVertex->GetIndices(); | |
231 | for(Int_t ind=0; ind<nIndices; ind++) { | |
232 | AliESDtrack *esdt = (AliESDtrack*)vEvent->GetTrack(indices[ind]); | |
233 | esdt->SetVertexID(-1); | |
234 | } | |
235 | } | |
236 | ||
6d8df534 | 237 | return fCurrentVertex; |
238 | } | |
239 | //---------------------------------------------------------------------------- | |
240 | AliESDVertex* AliVertexerTracks::FindPrimaryVertex(TObjArray *trkArrayOrig, | |
241 | UShort_t *idOrig) | |
242 | { | |
243 | // | |
244 | // Primary vertex using the AliExternalTrackParam's in the TObjArray. | |
245 | // idOrig must contain the track IDs from AliESDtrack::GetID() | |
246 | // (Two iterations: | |
247 | // 1st with 5*fNSigma*sigma cut w.r.t. to initial vertex | |
248 | // + cut on sqrt(d0d0+z0z0) if fConstraint=kFALSE | |
249 | // 2nd with fNSigma*sigma cut w.r.t. to vertex found in 1st iteration) | |
250 | // | |
251 | fCurrentVertex = 0; | |
252 | ||
253 | // accept 1-track case only if constraint is available | |
254 | if(!fConstraint && fMinTracks==1) fMinTracks=2; | |
255 | ||
f09c879d | 256 | // read tracks from array |
6d8df534 | 257 | Int_t nTrksOrig = (Int_t)trkArrayOrig->GetEntriesFast(); |
919e537f | 258 | AliDebug(1,Form("Initial number of tracks: %d",nTrksOrig)); |
f09c879d | 259 | if(nTrksOrig<fMinTracks) { |
919e537f | 260 | AliDebug(1,"TooFewTracks"); |
6d8df534 | 261 | TooFewTracks(); |
262 | return fCurrentVertex; | |
263 | } | |
264 | ||
fee9ef0d | 265 | // If fConstraint=kFALSE |
266 | // run VertexFinder(1) to get rough estimate of initVertex (x,y) | |
267 | if(!fConstraint) { | |
6d8df534 | 268 | // fill fTrkArraySel, for VertexFinder() |
269 | fIdSel = new UShort_t[nTrksOrig]; | |
270 | PrepareTracks(*trkArrayOrig,idOrig,0); | |
44a76311 | 271 | if(fIdSel) { delete fIdSel; fIdSel=NULL; } |
6d8df534 | 272 | Double_t cutsave = fDCAcut; |
f09c879d | 273 | fDCAcut = fDCAcutIter0; |
8c75f668 | 274 | // vertex finder |
275 | switch (fAlgoIter0) { | |
276 | case 1: StrLinVertexFinderMinDist(1); break; | |
277 | case 2: StrLinVertexFinderMinDist(0); break; | |
278 | case 3: HelixVertexFinder(); break; | |
279 | case 4: VertexFinder(1); break; | |
280 | case 5: VertexFinder(0); break; | |
281 | default: printf("Wrong algorithm\n"); break; | |
282 | } | |
fee9ef0d | 283 | fDCAcut = cutsave; |
fee9ef0d | 284 | if(fVert.GetNContributors()>0) { |
285 | fVert.GetXYZ(fNominalPos); | |
286 | fNominalPos[0] = fVert.GetXv(); | |
287 | fNominalPos[1] = fVert.GetYv(); | |
288 | fNominalPos[2] = fVert.GetZv(); | |
919e537f | 289 | AliDebug(1,Form("No mean vertex: VertexFinder gives (%f, %f, %f)",fNominalPos[0],fNominalPos[1],fNominalPos[2])); |
fee9ef0d | 290 | } else { |
291 | fNominalPos[0] = 0.; | |
292 | fNominalPos[1] = 0.; | |
293 | fNominalPos[2] = 0.; | |
919e537f | 294 | AliDebug(1,"No mean vertex and VertexFinder failed"); |
0c69be49 | 295 | } |
07680cae | 296 | } |
fee9ef0d | 297 | |
298 | // TWO ITERATIONS: | |
299 | // | |
300 | // ITERATION 1 | |
301 | // propagate tracks to fNominalPos vertex | |
302 | // preselect them: | |
303 | // if(constraint) reject for |d0|>5*fNSigma*sigma w.r.t. fNominal... vertex | |
304 | // else reject for |d0|\oplus|z0| > 5 mm w.r.t. fNominal... vertex | |
07680cae | 305 | // ITERATION 2 |
306 | // propagate tracks to best between initVertex and fCurrentVertex | |
307 | // preselect tracks (reject for |d0|>fNSigma*sigma w.r.t. best | |
308 | // between initVertex and fCurrentVertex) | |
6d8df534 | 309 | for(Int_t iter=1; iter<=2; iter++) { |
310 | if(fOnlyFitter && iter==1) continue; | |
44a76311 | 311 | if(fIdSel) { delete fIdSel; fIdSel=NULL; } |
6d8df534 | 312 | fIdSel = new UShort_t[nTrksOrig]; |
313 | Int_t nTrksSel = PrepareTracks(*trkArrayOrig,idOrig,iter); | |
919e537f | 314 | AliDebug(1,Form("N tracks selected in iteration %d: %d",iter,nTrksSel)); |
6d8df534 | 315 | if(nTrksSel < fMinTracks) { |
316 | TooFewTracks(); | |
fee9ef0d | 317 | return fCurrentVertex; |
318 | } | |
07680cae | 319 | |
fee9ef0d | 320 | // vertex finder |
321 | if(!fOnlyFitter) { | |
6d8df534 | 322 | if(nTrksSel==1) { |
919e537f | 323 | AliDebug(1,"Just one track"); |
fee9ef0d | 324 | OneTrackVertFinder(); |
6d8df534 | 325 | } else { |
fee9ef0d | 326 | switch (fAlgo) { |
327 | case 1: StrLinVertexFinderMinDist(1); break; | |
328 | case 2: StrLinVertexFinderMinDist(0); break; | |
329 | case 3: HelixVertexFinder(); break; | |
330 | case 4: VertexFinder(1); break; | |
331 | case 5: VertexFinder(0); break; | |
919e537f | 332 | default: printf("Wrong algorithm"); break; |
fee9ef0d | 333 | } |
334 | } | |
919e537f | 335 | AliDebug(1," Vertex finding completed"); |
0c69be49 | 336 | } |
07680cae | 337 | |
fee9ef0d | 338 | // vertex fitter |
6d8df534 | 339 | VertexFitter(); |
fee9ef0d | 340 | } // end loop on the two iterations |
07680cae | 341 | |
fee9ef0d | 342 | |
50ff0bcd | 343 | // set indices of used tracks |
344 | UShort_t *indices = 0; | |
50ff0bcd | 345 | if(fCurrentVertex->GetNContributors()>0) { |
4d023a8f | 346 | Int_t nIndices = (Int_t)fTrkArraySel.GetEntriesFast(); |
347 | indices = new UShort_t[nIndices]; | |
348 | for(Int_t jj=0; jj<nIndices; jj++) | |
6d8df534 | 349 | indices[jj] = fIdSel[jj]; |
4d023a8f | 350 | fCurrentVertex->SetIndices(nIndices,indices); |
50ff0bcd | 351 | } |
44a76311 | 352 | if (indices) {delete indices; indices=NULL;} |
6d8df534 | 353 | // |
fee9ef0d | 354 | |
6d8df534 | 355 | // set vertex title |
356 | TString title="VertexerTracksNoConstraint"; | |
357 | if(fConstraint) { | |
358 | title="VertexerTracksWithConstraint"; | |
359 | if(fOnlyFitter) title.Append("OnlyFitter"); | |
360 | } | |
361 | fCurrentVertex->SetTitle(title.Data()); | |
362 | // | |
a7ede274 | 363 | |
919e537f | 364 | AliDebug(1,Form("xyz: %f %f %f; nc %d",fCurrentVertex->GetXv(),fCurrentVertex->GetYv(),fCurrentVertex->GetZv(),fCurrentVertex->GetNContributors())); |
50ff0bcd | 365 | |
6d8df534 | 366 | // clean up |
44a76311 | 367 | delete fIdSel; fIdSel=NULL; |
6d8df534 | 368 | fTrkArraySel.Delete(); |
44a76311 | 369 | if(fTrksToSkip) { delete fTrksToSkip; fTrksToSkip=NULL; } |
6d8df534 | 370 | // |
fee9ef0d | 371 | |
07680cae | 372 | return fCurrentVertex; |
373 | } | |
50ff0bcd | 374 | //------------------------------------------------------------------------ |
fee9ef0d | 375 | Double_t AliVertexerTracks::GetDeterminant3X3(Double_t matr[][3]) |
376 | { | |
50ff0bcd | 377 | // |
378 | 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]; | |
379 | return det; | |
380 | } | |
381 | //------------------------------------------------------------------------- | |
fee9ef0d | 382 | void AliVertexerTracks::GetStrLinDerivMatrix(Double_t *p0,Double_t *p1,Double_t (*m)[3],Double_t *d) |
383 | { | |
50ff0bcd | 384 | // |
385 | Double_t x12=p0[0]-p1[0]; | |
386 | Double_t y12=p0[1]-p1[1]; | |
387 | Double_t z12=p0[2]-p1[2]; | |
388 | Double_t kk=x12*x12+y12*y12+z12*z12; | |
389 | m[0][0]=2-2/kk*x12*x12; | |
390 | m[0][1]=-2/kk*x12*y12; | |
391 | m[0][2]=-2/kk*x12*z12; | |
392 | m[1][0]=-2/kk*x12*y12; | |
393 | m[1][1]=2-2/kk*y12*y12; | |
394 | m[1][2]=-2/kk*y12*z12; | |
395 | m[2][0]=-2/kk*x12*z12; | |
396 | m[2][1]=-2*y12*z12; | |
397 | m[2][2]=2-2/kk*z12*z12; | |
398 | d[0]=2*p0[0]-2/kk*p0[0]*x12*x12-2/kk*p0[2]*x12*z12-2/kk*p0[1]*x12*y12; | |
399 | d[1]=2*p0[1]-2/kk*p0[1]*y12*y12-2/kk*p0[0]*x12*y12-2/kk*p0[2]*z12*y12; | |
400 | d[2]=2*p0[2]-2/kk*p0[2]*z12*z12-2/kk*p0[0]*x12*z12-2/kk*p0[1]*z12*y12; | |
c5e3e5d1 | 401 | |
50ff0bcd | 402 | } |
403 | //-------------------------------------------------------------------------- | |
fee9ef0d | 404 | void AliVertexerTracks::GetStrLinDerivMatrix(Double_t *p0,Double_t *p1,Double_t *sigmasq,Double_t (*m)[3],Double_t *d) |
405 | { | |
50ff0bcd | 406 | // |
407 | Double_t x12=p1[0]-p0[0]; | |
408 | Double_t y12=p1[1]-p0[1]; | |
409 | Double_t z12=p1[2]-p0[2]; | |
c5e3e5d1 | 410 | |
50ff0bcd | 411 | Double_t den= x12*x12*sigmasq[1]*sigmasq[2]+y12*y12*sigmasq[0]*sigmasq[2]+z12*z12*sigmasq[0]*sigmasq[1]; |
c5e3e5d1 | 412 | |
50ff0bcd | 413 | Double_t kk= 2*(x12*x12/sigmasq[0]+y12*y12/sigmasq[1]+z12*z12/sigmasq[2]); |
c5e3e5d1 | 414 | |
50ff0bcd | 415 | Double_t cc[3]; |
416 | cc[0]=-x12/sigmasq[0]; | |
417 | cc[1]=-y12/sigmasq[1]; | |
418 | cc[2]=-z12/sigmasq[2]; | |
ec1be5d5 | 419 | |
50ff0bcd | 420 | 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; |
ec1be5d5 | 421 | |
50ff0bcd | 422 | Double_t ss= -p0[0]*cc[0]-p0[1]*cc[1]-p0[2]*cc[2]; |
2d57349e | 423 | |
50ff0bcd | 424 | Double_t aa[3]; |
425 | aa[0]=x12*sigmasq[1]*sigmasq[2]/den; | |
426 | aa[1]=y12*sigmasq[0]*sigmasq[2]/den; | |
427 | aa[2]=z12*sigmasq[0]*sigmasq[1]/den; | |
2d57349e | 428 | |
50ff0bcd | 429 | m[0][0]=aa[0]*(aa[0]*kk+2*cc[0])+2*cc[0]*aa[0]+2/sigmasq[0]; |
430 | m[0][1]=aa[1]*(aa[0]*kk+2*cc[0])+2*cc[1]*aa[0]; | |
431 | m[0][2]=aa[2]*(aa[0]*kk+2*cc[0])+2*cc[2]*aa[0]; | |
2d57349e | 432 | |
50ff0bcd | 433 | m[1][0]=aa[0]*(aa[1]*kk+2*cc[1])+2*cc[0]*aa[1]; |
434 | m[1][1]=aa[1]*(aa[1]*kk+2*cc[1])+2*cc[1]*aa[1]+2/sigmasq[1]; | |
435 | m[1][2]=aa[2]*(aa[1]*kk+2*cc[1])+2*cc[2]*aa[1]; | |
2d57349e | 436 | |
50ff0bcd | 437 | m[2][0]=aa[0]*(aa[2]*kk+2*cc[2])+2*cc[0]*aa[2]; |
438 | m[2][1]=aa[1]*(aa[2]*kk+2*cc[2])+2*cc[1]*aa[2]; | |
439 | m[2][2]=aa[2]*(aa[2]*kk+2*cc[2])+2*cc[2]*aa[2]+2/sigmasq[2]; | |
08df6187 | 440 | |
50ff0bcd | 441 | d[0]=-ww*(aa[0]*kk+2*cc[0])-2*ss*aa[0]+2*p0[0]/sigmasq[0]; |
442 | d[1]=-ww*(aa[1]*kk+2*cc[1])-2*ss*aa[1]+2*p0[1]/sigmasq[1]; | |
443 | d[2]=-ww*(aa[2]*kk+2*cc[2])-2*ss*aa[2]+2*p0[2]/sigmasq[2]; | |
2d57349e | 444 | |
2d57349e | 445 | } |
50ff0bcd | 446 | //-------------------------------------------------------------------------- |
fee9ef0d | 447 | Double_t AliVertexerTracks::GetStrLinMinDist(Double_t *p0,Double_t *p1,Double_t *x0) |
448 | { | |
50ff0bcd | 449 | // |
450 | Double_t x12=p0[0]-p1[0]; | |
451 | Double_t y12=p0[1]-p1[1]; | |
452 | Double_t z12=p0[2]-p1[2]; | |
453 | Double_t x10=p0[0]-x0[0]; | |
454 | Double_t y10=p0[1]-x0[1]; | |
455 | Double_t z10=p0[2]-x0[2]; | |
3446476f | 456 | // 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); |
3446476f | 457 | return ((y10*z12-z10*y12)*(y10*z12-z10*y12)+ |
458 | (z10*x12-x10*z12)*(z10*x12-x10*z12)+ | |
459 | (x10*y12-y10*x12)*(x10*y12-y10*x12)) | |
460 | /(x12*x12+y12*y12+z12*z12); | |
2d57349e | 461 | } |
462 | //--------------------------------------------------------------------------- | |
fee9ef0d | 463 | void AliVertexerTracks::OneTrackVertFinder() |
464 | { | |
0c69be49 | 465 | // find vertex for events with 1 track, using DCA to nominal beam axis |
919e537f | 466 | AliDebug(1,Form("Number of prepared tracks =%d - Call OneTrackVertFinder",fTrkArraySel.GetEntries())); |
6d8df534 | 467 | AliExternalTrackParam *track1; |
468 | track1 = (AliExternalTrackParam*)fTrkArraySel.At(0); | |
0c69be49 | 469 | Double_t alpha=track1->GetAlpha(); |
470 | Double_t mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; | |
471 | Double_t pos[3],dir[3]; | |
f09c879d | 472 | track1->GetXYZAt(mindist,GetFieldkG(),pos); |
473 | track1->GetPxPyPzAt(mindist,GetFieldkG(),dir); | |
0c69be49 | 474 | AliStrLine *line1 = new AliStrLine(pos,dir); |
475 | Double_t p1[3]={fNominalPos[0],fNominalPos[1],0.}; | |
476 | Double_t p2[3]={fNominalPos[0],fNominalPos[1],10.}; | |
477 | AliStrLine *zeta=new AliStrLine(p1,p2,kTRUE); | |
478 | Double_t crosspoint[3]={0.,0.,0.}; | |
479 | Double_t sigma=999.; | |
480 | Int_t nContrib=-1; | |
481 | Int_t retcode = zeta->Cross(line1,crosspoint); | |
482 | if(retcode>=0){ | |
483 | sigma=line1->GetDistFromPoint(crosspoint); | |
484 | nContrib=1; | |
485 | } | |
486 | delete zeta; | |
487 | delete line1; | |
488 | fVert.SetXYZ(crosspoint); | |
489 | fVert.SetDispersion(sigma); | |
490 | fVert.SetNContributors(nContrib); | |
491 | } | |
492 | //--------------------------------------------------------------------------- | |
fee9ef0d | 493 | void AliVertexerTracks::HelixVertexFinder() |
494 | { | |
2d57349e | 495 | // Get estimate of vertex position in (x,y) from tracks DCA |
496 | ||
497 | ||
498 | Double_t initPos[3]; | |
499 | initPos[2] = 0.; | |
500 | for(Int_t i=0;i<2;i++)initPos[i]=fNominalPos[i]; | |
2d57349e | 501 | |
6d8df534 | 502 | Int_t nacc = (Int_t)fTrkArraySel.GetEntriesFast(); |
2d57349e | 503 | |
504 | Double_t aver[3]={0.,0.,0.}; | |
505 | Double_t averquad[3]={0.,0.,0.}; | |
506 | Double_t sigmaquad[3]={0.,0.,0.}; | |
507 | Double_t sigma=0; | |
508 | Int_t ncombi = 0; | |
6d8df534 | 509 | AliExternalTrackParam *track1; |
510 | AliExternalTrackParam *track2; | |
2d57349e | 511 | Double_t distCA; |
6d8df534 | 512 | Double_t x; |
2d57349e | 513 | Double_t alpha, cs, sn; |
514 | Double_t crosspoint[3]; | |
515 | for(Int_t i=0; i<nacc; i++){ | |
6d8df534 | 516 | track1 = (AliExternalTrackParam*)fTrkArraySel.At(i); |
2d57349e | 517 | |
518 | ||
519 | for(Int_t j=i+1; j<nacc; j++){ | |
6d8df534 | 520 | track2 = (AliExternalTrackParam*)fTrkArraySel.At(j); |
2d57349e | 521 | |
f09c879d | 522 | distCA=track2->PropagateToDCA(track1,GetFieldkG()); |
2d57349e | 523 | if(fDCAcut<=0 ||(fDCAcut>0&&distCA<fDCAcut)){ |
6d8df534 | 524 | x=track1->GetX(); |
2d57349e | 525 | alpha=track1->GetAlpha(); |
526 | cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); | |
6d8df534 | 527 | Double_t x1=x*cs - track1->GetY()*sn; |
528 | Double_t y1=x*sn + track1->GetY()*cs; | |
529 | Double_t z1=track1->GetZ(); | |
530 | ||
2d57349e | 531 | Double_t sx1=sn*sn*track1->GetSigmaY2(), sy1=cs*cs*track1->GetSigmaY2(); |
6d8df534 | 532 | x=track2->GetX(); |
2d57349e | 533 | alpha=track2->GetAlpha(); |
534 | cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); | |
6d8df534 | 535 | Double_t x2=x*cs - track2->GetY()*sn; |
536 | Double_t y2=x*sn + track2->GetY()*cs; | |
537 | Double_t z2=track2->GetZ(); | |
2d57349e | 538 | Double_t sx2=sn*sn*track2->GetSigmaY2(), sy2=cs*cs*track2->GetSigmaY2(); |
539 | Double_t sz1=track1->GetSigmaZ2(), sz2=track2->GetSigmaZ2(); | |
540 | Double_t wx1=sx2/(sx1+sx2), wx2=1.- wx1; | |
541 | Double_t wy1=sy2/(sy1+sy2), wy2=1.- wy1; | |
542 | Double_t wz1=sz2/(sz1+sz2), wz2=1.- wz1; | |
543 | crosspoint[0]=wx1*x1 + wx2*x2; | |
544 | crosspoint[1]=wy1*y1 + wy2*y2; | |
545 | crosspoint[2]=wz1*z1 + wz2*z2; | |
546 | ||
547 | ncombi++; | |
548 | for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj]; | |
549 | for(Int_t jj=0;jj<3;jj++)averquad[jj]+=(crosspoint[jj]*crosspoint[jj]); | |
550 | } | |
551 | } | |
552 | ||
553 | } | |
554 | if(ncombi>0){ | |
555 | for(Int_t jj=0;jj<3;jj++){ | |
556 | initPos[jj] = aver[jj]/ncombi; | |
557 | averquad[jj]/=ncombi; | |
558 | sigmaquad[jj]=averquad[jj]-initPos[jj]*initPos[jj]; | |
559 | sigma+=sigmaquad[jj]; | |
560 | } | |
561 | sigma=TMath::Sqrt(TMath::Abs(sigma)); | |
562 | } | |
563 | else { | |
564 | Warning("HelixVertexFinder","Finder did not succed"); | |
565 | sigma=999; | |
566 | } | |
567 | fVert.SetXYZ(initPos); | |
568 | fVert.SetDispersion(sigma); | |
569 | fVert.SetNContributors(ncombi); | |
570 | } | |
50ff0bcd | 571 | //---------------------------------------------------------------------------- |
6d8df534 | 572 | Int_t AliVertexerTracks::PrepareTracks(TObjArray &trkArrayOrig, |
573 | UShort_t *idOrig, | |
574 | Int_t optImpParCut) | |
fee9ef0d | 575 | { |
50ff0bcd | 576 | // |
577 | // Propagate tracks to initial vertex position and store them in a TObjArray | |
578 | // | |
919e537f | 579 | AliDebug(1," PrepareTracks()"); |
6d8df534 | 580 | |
581 | Int_t nTrksOrig = (Int_t)trkArrayOrig.GetEntriesFast(); | |
582 | Int_t nTrksSel = 0; | |
fee9ef0d | 583 | Double_t maxd0rphi; |
50ff0bcd | 584 | Double_t sigmaCurr[3]; |
fee9ef0d | 585 | Double_t normdistx,normdisty; |
6d8df534 | 586 | Double_t d0z0[2],covd0z0[3]; |
43c9dae1 | 587 | Double_t sigmad0; |
50ff0bcd | 588 | |
589 | AliESDVertex *initVertex = new AliESDVertex(fNominalPos,fNominalCov,1,1); | |
590 | ||
6d8df534 | 591 | if(!fTrkArraySel.IsEmpty()) fTrkArraySel.Delete(); |
50ff0bcd | 592 | |
6d8df534 | 593 | AliExternalTrackParam *track=0; |
50ff0bcd | 594 | |
f09c879d | 595 | // loop on tracks |
6d8df534 | 596 | for(Int_t i=0; i<nTrksOrig; i++) { |
2258e165 | 597 | AliExternalTrackParam *trackOrig=(AliExternalTrackParam*)trkArrayOrig.At(i); |
598 | if(trackOrig->Charge()!=0) { // normal tracks | |
599 | track = new AliExternalTrackParam(*(AliExternalTrackParam*)trkArrayOrig.At(i)); | |
600 | } else { // neutral tracks (from a V0) | |
601 | track = new AliNeutralTrackParam(*(AliNeutralTrackParam*)trkArrayOrig.At(i)); | |
602 | } | |
02bb7b6c | 603 | |
f09c879d | 604 | // tgl cut |
605 | if(TMath::Abs(track->GetTgl())>fMaxTgl) { | |
919e537f | 606 | AliDebug(1,Form(" rejecting track with tgl = %f",track->GetTgl())); |
f09c879d | 607 | delete track; continue; |
6d8df534 | 608 | } |
50ff0bcd | 609 | |
d993e038 | 610 | Bool_t propagateOK = kFALSE, cutond0z0 = kTRUE; |
50ff0bcd | 611 | // propagate track to vertex |
43c9dae1 | 612 | if(optImpParCut<2 || fOnlyFitter) { // optImpParCut==1 or 0 |
18eba197 | 613 | propagateOK = track->PropagateToDCA(initVertex,GetFieldkG(),100.,d0z0,covd0z0); |
fee9ef0d | 614 | } else { // optImpParCut==2 |
50ff0bcd | 615 | fCurrentVertex->GetSigmaXYZ(sigmaCurr); |
fee9ef0d | 616 | normdistx = TMath::Abs(fCurrentVertex->GetXv()-fNominalPos[0])/TMath::Sqrt(sigmaCurr[0]*sigmaCurr[0]+fNominalCov[0]); |
80d36431 | 617 | normdisty = TMath::Abs(fCurrentVertex->GetYv()-fNominalPos[1])/TMath::Sqrt(sigmaCurr[1]*sigmaCurr[1]+fNominalCov[2]); |
d993e038 | 618 | AliDebug(1,Form("normdistx %f %f %f",fCurrentVertex->GetXv(),fNominalPos[0],TMath::Sqrt(sigmaCurr[0]*sigmaCurr[0]+fNominalCov[0]))); |
619 | AliDebug(1,Form("normdisty %f %f %f",fCurrentVertex->GetYv(),fNominalPos[1],TMath::Sqrt(sigmaCurr[1]*sigmaCurr[1]+fNominalCov[2]))); | |
620 | AliDebug(1,Form("sigmaCurr %f %f %f",sigmaCurr[0],sigmaCurr[1],TMath::Sqrt(fNominalCov[0])+TMath::Sqrt(fNominalCov[2]))); | |
fee9ef0d | 621 | if(normdistx < 3. && normdisty < 3. && |
80d36431 | 622 | (sigmaCurr[0]+sigmaCurr[1])<(TMath::Sqrt(fNominalCov[0])+TMath::Sqrt(fNominalCov[2]))) { |
18eba197 | 623 | propagateOK = track->PropagateToDCA(fCurrentVertex,GetFieldkG(),100.,d0z0,covd0z0); |
50ff0bcd | 624 | } else { |
18eba197 | 625 | propagateOK = track->PropagateToDCA(initVertex,GetFieldkG(),100.,d0z0,covd0z0); |
d993e038 | 626 | if(fConstraint) cutond0z0=kFALSE; |
50ff0bcd | 627 | } |
628 | } | |
629 | ||
18eba197 | 630 | if(!propagateOK) { |
919e537f | 631 | AliDebug(1," rejected"); |
18eba197 | 632 | delete track; continue; |
633 | } | |
634 | ||
43c9dae1 | 635 | sigmad0 = TMath::Sqrt(covd0z0[0]); |
636 | maxd0rphi = fNSigma*sigmad0; | |
fee9ef0d | 637 | if(optImpParCut==1) maxd0rphi *= 5.; |
6b29d399 | 638 | maxd0rphi = TMath::Min(maxd0rphi,fFiducialR); |
d993e038 | 639 | //sigmad0z0 = TMath::Sqrt(covd0z0[0]+covd0z0[2]); |
fee9ef0d | 640 | |
919e537f | 641 | 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)); |
f09c879d | 642 | |
643 | ||
644 | //---- track selection based on impact parameters ----// | |
645 | ||
646 | // always reject tracks outside fiducial volume | |
6b29d399 | 647 | if(TMath::Abs(d0z0[0])>fFiducialR || TMath::Abs(d0z0[1])>fFiducialZ) { |
919e537f | 648 | AliDebug(1," rejected"); |
f09c879d | 649 | delete track; continue; |
650 | } | |
651 | ||
652 | // during iterations 1 and 2 , reject tracks with d0rphi > maxd0rphi | |
653 | if(optImpParCut>0 && TMath::Abs(d0z0[0])>maxd0rphi) { | |
919e537f | 654 | AliDebug(1," rejected"); |
f09c879d | 655 | delete track; continue; |
656 | } | |
fee9ef0d | 657 | |
43c9dae1 | 658 | // if fConstraint=kFALSE, during iterations 1 and 2 || |
659 | // if fConstraint=kTRUE, during iteration 2, | |
f09c879d | 660 | // select tracks with d0oplusz0 < fMaxd0z0 |
43c9dae1 | 661 | if((!fConstraint && optImpParCut>0 && fVert.GetNContributors()>0) || |
d993e038 | 662 | ( fConstraint && optImpParCut==2 && cutond0z0)) { |
43c9dae1 | 663 | if(nTrksOrig>=3 && |
f09c879d | 664 | TMath::Sqrt(d0z0[0]*d0z0[0]+d0z0[1]*d0z0[1])>fMaxd0z0) { |
919e537f | 665 | AliDebug(1," rejected"); |
fee9ef0d | 666 | delete track; continue; |
667 | } | |
668 | } | |
43c9dae1 | 669 | |
f09c879d | 670 | // track passed all selections |
6d8df534 | 671 | fTrkArraySel.AddLast(track); |
672 | fIdSel[nTrksSel] = idOrig[i]; | |
673 | nTrksSel++; | |
f09c879d | 674 | } // end loop on tracks |
50ff0bcd | 675 | |
676 | delete initVertex; | |
677 | ||
6d8df534 | 678 | return nTrksSel; |
50ff0bcd | 679 | } |
f09c879d | 680 | //---------------------------------------------------------------------------- |
681 | Bool_t AliVertexerTracks::PropagateTrackTo(AliExternalTrackParam *track, | |
682 | Double_t xToGo) { | |
683 | //---------------------------------------------------------------- | |
684 | // COPIED from AliTracker | |
685 | // | |
686 | // Propagates the track to the plane X=xk (cm). | |
687 | // | |
688 | // Origin: Marian Ivanov, Marian.Ivanov@cern.ch | |
689 | //---------------------------------------------------------------- | |
690 | ||
691 | const Double_t kEpsilon = 0.00001; | |
692 | Double_t xpos = track->GetX(); | |
693 | Double_t dir = (xpos<xToGo) ? 1. : -1.; | |
694 | Double_t maxStep = 5; | |
695 | Double_t maxSnp = 0.8; | |
696 | // | |
697 | while ( (xToGo-xpos)*dir > kEpsilon){ | |
698 | Double_t step = dir*TMath::Min(TMath::Abs(xToGo-xpos), maxStep); | |
699 | Double_t x = xpos+step; | |
700 | Double_t xyz0[3],xyz1[3]; | |
701 | track->GetXYZ(xyz0); //starting global position | |
702 | ||
703 | if(!track->GetXYZAt(x,GetFieldkG(),xyz1)) return kFALSE; // no prolongation | |
704 | xyz1[2]+=kEpsilon; // waiting for bug correction in geo | |
705 | ||
706 | if(TMath::Abs(track->GetSnpAt(x,GetFieldkG())) >= maxSnp) return kFALSE; | |
707 | if(!track->PropagateTo(x,GetFieldkG())) return kFALSE; | |
708 | ||
709 | if(TMath::Abs(track->GetSnp()) >= maxSnp) return kFALSE; | |
710 | track->GetXYZ(xyz0); // global position | |
711 | Double_t alphan = TMath::ATan2(xyz0[1], xyz0[0]); | |
712 | // | |
713 | Double_t ca=TMath::Cos(alphan-track->GetAlpha()), | |
714 | sa=TMath::Sin(alphan-track->GetAlpha()); | |
60e55aee | 715 | Double_t sf=track->GetSnp(), cf=TMath::Sqrt((1.-sf)*(1.+sf)); |
f09c879d | 716 | Double_t sinNew = sf*ca - cf*sa; |
717 | if(TMath::Abs(sinNew) >= maxSnp) return kFALSE; | |
718 | if(!track->Rotate(alphan)) return kFALSE; | |
719 | ||
720 | xpos = track->GetX(); | |
721 | } | |
722 | return kTRUE; | |
723 | } | |
50ff0bcd | 724 | //--------------------------------------------------------------------------- |
fee9ef0d | 725 | AliESDVertex* AliVertexerTracks::RemoveTracksFromVertex(AliESDVertex *inVtx, |
6d8df534 | 726 | TObjArray *trkArray, |
727 | UShort_t *id, | |
6b908072 | 728 | Float_t *diamondxy) const |
fee9ef0d | 729 | { |
50ff0bcd | 730 | // |
fee9ef0d | 731 | // Removes tracks in trksTree from fit of inVtx |
50ff0bcd | 732 | // |
fee9ef0d | 733 | |
146c29df | 734 | if(!strstr(inVtx->GetTitle(),"VertexerTracksWithConstraint")) { |
919e537f | 735 | printf("ERROR: primary vertex has no constraint: cannot remove tracks"); |
146c29df | 736 | return 0x0; |
737 | } | |
fee9ef0d | 738 | if(!strstr(inVtx->GetTitle(),"VertexerTracksWithConstraintOnlyFitter")) |
919e537f | 739 | printf("WARNING: result of tracks' removal will be only approximately correct"); |
fee9ef0d | 740 | |
741 | TMatrixD rv(3,1); | |
742 | rv(0,0) = inVtx->GetXv(); | |
743 | rv(1,0) = inVtx->GetYv(); | |
744 | rv(2,0) = inVtx->GetZv(); | |
745 | TMatrixD vV(3,3); | |
746 | Double_t cov[6]; | |
747 | inVtx->GetCovMatrix(cov); | |
748 | vV(0,0) = cov[0]; | |
749 | vV(0,1) = cov[1]; vV(1,0) = cov[1]; | |
750 | vV(1,1) = cov[2]; | |
751 | vV(0,2) = cov[3]; vV(2,0) = cov[3]; | |
752 | vV(1,2) = cov[4]; vV(2,1) = cov[4]; | |
753 | vV(2,2) = cov[5]; | |
754 | ||
755 | TMatrixD sumWi(TMatrixD::kInverted,vV); | |
756 | TMatrixD sumWiri(sumWi,TMatrixD::kMult,rv); | |
757 | ||
dad616ce | 758 | Int_t nUsedTrks = inVtx->GetNIndices(); |
fee9ef0d | 759 | Double_t chi2 = inVtx->GetChi2(); |
760 | ||
6d8df534 | 761 | AliExternalTrackParam *track = 0; |
762 | Int_t ntrks = (Int_t)trkArray->GetEntriesFast(); | |
fee9ef0d | 763 | for(Int_t i=0;i<ntrks;i++) { |
6d8df534 | 764 | track = (AliExternalTrackParam*)trkArray->At(i); |
765 | if(!inVtx->UsesTrack(id[i])) { | |
919e537f | 766 | printf("track %d was not used in vertex fit",id[i]); |
fee9ef0d | 767 | continue; |
768 | } | |
769 | Double_t alpha = track->GetAlpha(); | |
770 | Double_t xl = diamondxy[0]*TMath::Cos(alpha)+diamondxy[1]*TMath::Sin(alpha); | |
6d8df534 | 771 | track->PropagateTo(xl,GetFieldkG()); |
fee9ef0d | 772 | // vector of track global coordinates |
773 | TMatrixD ri(3,1); | |
774 | // covariance matrix of ri | |
775 | TMatrixD wWi(3,3); | |
776 | ||
777 | // get space point from track | |
778 | if(!TrackToPoint(track,ri,wWi)) continue; | |
779 | ||
780 | TMatrixD wWiri(wWi,TMatrixD::kMult,ri); | |
781 | ||
782 | sumWi -= wWi; | |
783 | sumWiri -= wWiri; | |
784 | ||
6b908072 | 785 | // track contribution to chi2 |
fee9ef0d | 786 | TMatrixD deltar = rv; deltar -= ri; |
787 | TMatrixD wWideltar(wWi,TMatrixD::kMult,deltar); | |
788 | Double_t chi2i = deltar(0,0)*wWideltar(0,0)+ | |
789 | deltar(1,0)*wWideltar(1,0)+ | |
790 | deltar(2,0)*wWideltar(2,0); | |
791 | // remove from total chi2 | |
792 | chi2 -= chi2i; | |
793 | ||
794 | nUsedTrks--; | |
795 | if(nUsedTrks<2) { | |
919e537f | 796 | printf("Trying to remove too many tracks!"); |
fee9ef0d | 797 | return 0x0; |
798 | } | |
799 | } | |
800 | ||
801 | TMatrixD rvnew(3,1); | |
802 | TMatrixD vVnew(3,3); | |
803 | ||
804 | // new inverted of weights matrix | |
805 | TMatrixD invsumWi(TMatrixD::kInverted,sumWi); | |
806 | vVnew = invsumWi; | |
807 | // new position of primary vertex | |
808 | rvnew.Mult(vVnew,sumWiri); | |
809 | ||
810 | Double_t position[3]; | |
811 | position[0] = rvnew(0,0); | |
812 | position[1] = rvnew(1,0); | |
813 | position[2] = rvnew(2,0); | |
814 | cov[0] = vVnew(0,0); | |
815 | cov[1] = vVnew(0,1); | |
816 | cov[2] = vVnew(1,1); | |
817 | cov[3] = vVnew(0,2); | |
818 | cov[4] = vVnew(1,2); | |
819 | cov[5] = vVnew(2,2); | |
820 | ||
821 | // store data in the vertex object | |
6b908072 | 822 | AliESDVertex *outVtx = new AliESDVertex(position,cov,chi2,nUsedTrks+1); // the +1 is for the constraint |
fee9ef0d | 823 | outVtx->SetTitle(inVtx->GetTitle()); |
fee9ef0d | 824 | UShort_t *inindices = inVtx->GetIndices(); |
dad616ce | 825 | Int_t nIndices = nUsedTrks; |
4d023a8f | 826 | UShort_t *outindices = new UShort_t[nIndices]; |
fee9ef0d | 827 | Int_t j=0; |
fee9ef0d | 828 | for(Int_t k=0; k<inVtx->GetNIndices(); k++) { |
6d8df534 | 829 | Bool_t copyindex=kTRUE; |
fee9ef0d | 830 | for(Int_t l=0; l<ntrks; l++) { |
6d8df534 | 831 | if(inindices[k]==id[l]) copyindex=kFALSE; |
fee9ef0d | 832 | } |
833 | if(copyindex) { | |
834 | outindices[j] = inindices[k]; j++; | |
835 | } | |
836 | } | |
4d023a8f | 837 | outVtx->SetIndices(nIndices,outindices); |
44a76311 | 838 | if (outindices) delete outindices; |
fee9ef0d | 839 | |
919e537f | 840 | /* |
841 | printf("Vertex before removing tracks:"); | |
fee9ef0d | 842 | inVtx->PrintStatus(); |
843 | inVtx->PrintIndices(); | |
919e537f | 844 | printf("Vertex after removing tracks:"); |
fee9ef0d | 845 | outVtx->PrintStatus(); |
846 | outVtx->PrintIndices(); | |
919e537f | 847 | */ |
fee9ef0d | 848 | |
849 | return outVtx; | |
850 | } | |
851 | //--------------------------------------------------------------------------- | |
6b908072 | 852 | AliESDVertex* AliVertexerTracks::RemoveConstraintFromVertex(AliESDVertex *inVtx, |
853 | Float_t *diamondxyz, | |
854 | Float_t *diamondcov) const | |
855 | { | |
856 | // | |
857 | // Removes diamond constraint from fit of inVtx | |
858 | // | |
859 | ||
860 | if(!strstr(inVtx->GetTitle(),"VertexerTracksWithConstraint")) { | |
861 | printf("ERROR: primary vertex has no constraint: cannot remove it\n"); | |
862 | return 0x0; | |
863 | } | |
864 | if(inVtx->GetNContributors()<3) { | |
865 | printf("ERROR: primary vertex has less than 2 tracks: cannot remove contraint\n"); | |
866 | return 0x0; | |
867 | } | |
868 | ||
869 | // diamond constraint | |
870 | TMatrixD vVb(3,3); | |
871 | vVb(0,0) = diamondcov[0]; | |
872 | vVb(0,1) = diamondcov[1]; | |
873 | vVb(0,2) = 0.; | |
874 | vVb(1,0) = diamondcov[1]; | |
875 | vVb(1,1) = diamondcov[2]; | |
876 | vVb(1,2) = 0.; | |
877 | vVb(2,0) = 0.; | |
878 | vVb(2,1) = 0.; | |
879 | vVb(2,2) = diamondcov[5]; | |
880 | TMatrixD vVbInv(TMatrixD::kInverted,vVb); | |
881 | TMatrixD rb(3,1); | |
882 | rb(0,0) = diamondxyz[0]; | |
883 | rb(1,0) = diamondxyz[1]; | |
884 | rb(2,0) = diamondxyz[2]; | |
885 | TMatrixD vVbInvrb(vVbInv,TMatrixD::kMult,rb); | |
886 | ||
887 | // input vertex | |
888 | TMatrixD rv(3,1); | |
889 | rv(0,0) = inVtx->GetXv(); | |
890 | rv(1,0) = inVtx->GetYv(); | |
891 | rv(2,0) = inVtx->GetZv(); | |
892 | TMatrixD vV(3,3); | |
893 | Double_t cov[6]; | |
894 | inVtx->GetCovMatrix(cov); | |
895 | vV(0,0) = cov[0]; | |
896 | vV(0,1) = cov[1]; vV(1,0) = cov[1]; | |
897 | vV(1,1) = cov[2]; | |
898 | vV(0,2) = cov[3]; vV(2,0) = cov[3]; | |
899 | vV(1,2) = cov[4]; vV(2,1) = cov[4]; | |
900 | vV(2,2) = cov[5]; | |
901 | TMatrixD vVInv(TMatrixD::kInverted,vV); | |
902 | TMatrixD vVInvrv(vVInv,TMatrixD::kMult,rv); | |
903 | ||
904 | ||
905 | TMatrixD sumWi = vVInv - vVbInv; | |
906 | ||
907 | ||
908 | TMatrixD sumWiri = vVInvrv - vVbInvrb; | |
909 | ||
910 | TMatrixD rvnew(3,1); | |
911 | TMatrixD vVnew(3,3); | |
912 | ||
913 | // new inverted of weights matrix | |
914 | TMatrixD invsumWi(TMatrixD::kInverted,sumWi); | |
915 | vVnew = invsumWi; | |
916 | // new position of primary vertex | |
917 | rvnew.Mult(vVnew,sumWiri); | |
918 | ||
919 | Double_t position[3]; | |
920 | position[0] = rvnew(0,0); | |
921 | position[1] = rvnew(1,0); | |
922 | position[2] = rvnew(2,0); | |
923 | cov[0] = vVnew(0,0); | |
924 | cov[1] = vVnew(0,1); | |
925 | cov[2] = vVnew(1,1); | |
926 | cov[3] = vVnew(0,2); | |
927 | cov[4] = vVnew(1,2); | |
928 | cov[5] = vVnew(2,2); | |
929 | ||
930 | ||
931 | Double_t chi2 = inVtx->GetChi2(); | |
932 | ||
933 | // diamond constribution to chi2 | |
934 | TMatrixD deltar = rv; deltar -= rb; | |
935 | TMatrixD vVbInvdeltar(vVbInv,TMatrixD::kMult,deltar); | |
936 | Double_t chi2b = deltar(0,0)*vVbInvdeltar(0,0)+ | |
937 | deltar(1,0)*vVbInvdeltar(1,0)+ | |
938 | deltar(2,0)*vVbInvdeltar(2,0); | |
939 | // remove from total chi2 | |
940 | chi2 -= chi2b; | |
941 | ||
942 | // store data in the vertex object | |
943 | AliESDVertex *outVtx = new AliESDVertex(position,cov,chi2,inVtx->GetNContributors()-1); | |
944 | outVtx->SetTitle("VertexerTracksNoConstraint"); | |
945 | UShort_t *inindices = inVtx->GetIndices(); | |
946 | Int_t nIndices = inVtx->GetNIndices(); | |
947 | outVtx->SetIndices(nIndices,inindices); | |
948 | ||
949 | return outVtx; | |
950 | } | |
951 | //--------------------------------------------------------------------------- | |
a00021a7 | 952 | void AliVertexerTracks::SetCuts(Double_t *cuts) |
953 | { | |
954 | // | |
955 | // Cut values | |
956 | // | |
957 | SetDCAcut(cuts[0]); | |
958 | SetDCAcutIter0(cuts[1]); | |
959 | SetMaxd0z0(cuts[2]); | |
5b78b791 | 960 | if(fMode==0 && cuts[3]<0) SetITSrefitNotRequired(); |
961 | SetMinClusters((Int_t)(TMath::Abs(cuts[3]))); | |
a00021a7 | 962 | SetMinTracks((Int_t)(cuts[4])); |
963 | SetNSigmad0(cuts[5]); | |
964 | SetMinDetFitter(cuts[6]); | |
965 | SetMaxTgl(cuts[7]); | |
966 | SetFiducialRZ(cuts[8],cuts[9]); | |
8c75f668 | 967 | fAlgo=(Int_t)(cuts[10]); |
968 | fAlgoIter0=(Int_t)(cuts[11]); | |
a00021a7 | 969 | |
970 | return; | |
971 | } | |
972 | //--------------------------------------------------------------------------- | |
f09c879d | 973 | void AliVertexerTracks::SetITSMode(Double_t dcacut, |
974 | Double_t dcacutIter0, | |
975 | Double_t maxd0z0, | |
6b29d399 | 976 | Int_t minCls, |
f09c879d | 977 | Int_t mintrks, |
978 | Double_t nsigma, | |
979 | Double_t mindetfitter, | |
6b29d399 | 980 | Double_t maxtgl, |
981 | Double_t fidR, | |
8c75f668 | 982 | Double_t fidZ, |
983 | Int_t finderAlgo, | |
984 | Int_t finderAlgoIter0) | |
f09c879d | 985 | { |
986 | // | |
987 | // Cut values for ITS mode | |
988 | // | |
989 | fMode = 0; | |
5b78b791 | 990 | if(minCls>0) { |
991 | SetITSrefitRequired(); | |
992 | } else { | |
993 | SetITSrefitNotRequired(); | |
994 | } | |
f09c879d | 995 | SetDCAcut(dcacut); |
996 | SetDCAcutIter0(dcacutIter0); | |
997 | SetMaxd0z0(maxd0z0); | |
5b78b791 | 998 | SetMinClusters(TMath::Abs(minCls)); |
f09c879d | 999 | SetMinTracks(mintrks); |
1000 | SetNSigmad0(nsigma); | |
1001 | SetMinDetFitter(mindetfitter); | |
1002 | SetMaxTgl(maxtgl); | |
6b29d399 | 1003 | SetFiducialRZ(fidR,fidZ); |
8c75f668 | 1004 | fAlgo=finderAlgo; |
1005 | fAlgoIter0=finderAlgoIter0; | |
f09c879d | 1006 | |
1007 | return; | |
1008 | } | |
1009 | //--------------------------------------------------------------------------- | |
1010 | void AliVertexerTracks::SetTPCMode(Double_t dcacut, | |
1011 | Double_t dcacutIter0, | |
1012 | Double_t maxd0z0, | |
6b29d399 | 1013 | Int_t minCls, |
f09c879d | 1014 | Int_t mintrks, |
1015 | Double_t nsigma, | |
1016 | Double_t mindetfitter, | |
6b29d399 | 1017 | Double_t maxtgl, |
1018 | Double_t fidR, | |
8c75f668 | 1019 | Double_t fidZ, |
1020 | Int_t finderAlgo, | |
1021 | Int_t finderAlgoIter0) | |
f09c879d | 1022 | { |
1023 | // | |
1024 | // Cut values for TPC mode | |
1025 | // | |
1026 | fMode = 1; | |
1027 | SetITSrefitNotRequired(); | |
1028 | SetDCAcut(dcacut); | |
1029 | SetDCAcutIter0(dcacutIter0); | |
1030 | SetMaxd0z0(maxd0z0); | |
6b29d399 | 1031 | SetMinClusters(minCls); |
f09c879d | 1032 | SetMinTracks(mintrks); |
1033 | SetNSigmad0(nsigma); | |
1034 | SetMinDetFitter(mindetfitter); | |
1035 | SetMaxTgl(maxtgl); | |
6b29d399 | 1036 | SetFiducialRZ(fidR,fidZ); |
8c75f668 | 1037 | fAlgo=finderAlgo; |
1038 | fAlgoIter0=finderAlgoIter0; | |
f09c879d | 1039 | |
1040 | return; | |
1041 | } | |
1042 | //--------------------------------------------------------------------------- | |
fee9ef0d | 1043 | void AliVertexerTracks::SetSkipTracks(Int_t n,Int_t *skipped) |
1044 | { | |
1045 | // | |
1046 | // Mark the tracks not to be used in the vertex reconstruction. | |
1047 | // Tracks are identified by AliESDtrack::GetID() | |
1048 | // | |
1049 | fNTrksToSkip = n; fTrksToSkip = new Int_t[n]; | |
50ff0bcd | 1050 | for(Int_t i=0;i<n;i++) fTrksToSkip[i] = skipped[i]; |
1051 | return; | |
1052 | } | |
1053 | //--------------------------------------------------------------------------- | |
fee9ef0d | 1054 | void AliVertexerTracks::SetVtxStart(AliESDVertex *vtx) |
1055 | { | |
50ff0bcd | 1056 | // |
1057 | // Set initial vertex knowledge | |
1058 | // | |
1059 | vtx->GetXYZ(fNominalPos); | |
1060 | vtx->GetCovMatrix(fNominalCov); | |
fee9ef0d | 1061 | SetConstraintOn(); |
50ff0bcd | 1062 | return; |
1063 | } | |
2d57349e | 1064 | //--------------------------------------------------------------------------- |
fee9ef0d | 1065 | void AliVertexerTracks::StrLinVertexFinderMinDist(Int_t optUseWeights) |
dc3719f3 | 1066 | { |
6d8df534 | 1067 | AliExternalTrackParam *track1; |
6d8df534 | 1068 | const Int_t knacc = (Int_t)fTrkArraySel.GetEntriesFast(); |
8e104736 | 1069 | AliStrLine **linarray = new AliStrLine* [knacc]; |
dc3719f3 | 1070 | for(Int_t i=0; i<knacc; i++){ |
6d8df534 | 1071 | track1 = (AliExternalTrackParam*)fTrkArraySel.At(i); |
dc3719f3 | 1072 | Double_t alpha=track1->GetAlpha(); |
1073 | Double_t mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; | |
1074 | Double_t pos[3],dir[3],sigmasq[3]; | |
f09c879d | 1075 | track1->GetXYZAt(mindist,GetFieldkG(),pos); |
1076 | track1->GetPxPyPzAt(mindist,GetFieldkG(),dir); | |
dc3719f3 | 1077 | sigmasq[0]=TMath::Sin(alpha)*TMath::Sin(alpha)*track1->GetSigmaY2(); |
1078 | sigmasq[1]=TMath::Cos(alpha)*TMath::Cos(alpha)*track1->GetSigmaY2(); | |
1079 | sigmasq[2]=track1->GetSigmaZ2(); | |
146c29df | 1080 | TMatrixD ri(3,1); |
1081 | TMatrixD wWi(3,3); | |
8c75f668 | 1082 | if(!TrackToPoint(track1,ri,wWi)) {optUseWeights=kFALSE;printf("WARNING\n");} |
146c29df | 1083 | Double_t wmat[9]; |
1084 | Int_t iel=0; | |
1085 | for(Int_t ia=0;ia<3;ia++){ | |
1086 | for(Int_t ib=0;ib<3;ib++){ | |
1087 | wmat[iel]=wWi(ia,ib); | |
1088 | iel++; | |
1089 | } | |
1090 | } | |
8e104736 | 1091 | linarray[i] = new AliStrLine(pos,sigmasq,wmat,dir); |
dc3719f3 | 1092 | } |
8e104736 | 1093 | fVert=TrackletVertexFinder(linarray,knacc,optUseWeights); |
1094 | for(Int_t i=0; i<knacc; i++) delete linarray[i]; | |
1095 | delete [] linarray; | |
dc3719f3 | 1096 | } |
1097 | //--------------------------------------------------------------------------- | |
146c29df | 1098 | AliESDVertex AliVertexerTracks::TrackletVertexFinder(TClonesArray *lines, Int_t optUseWeights) |
fee9ef0d | 1099 | { |
8e104736 | 1100 | // Calculate the point at minimum distance to prepared tracks (TClonesArray) |
dc3719f3 | 1101 | const Int_t knacc = (Int_t)lines->GetEntriesFast(); |
8e104736 | 1102 | AliStrLine** lines2 = new AliStrLine* [knacc]; |
1103 | for(Int_t i=0; i<knacc; i++){ | |
1104 | lines2[i]= (AliStrLine*)lines->At(i); | |
1105 | } | |
1106 | AliESDVertex vert = TrackletVertexFinder(lines2,knacc,optUseWeights); | |
1107 | delete [] lines2; | |
1108 | return vert; | |
1109 | } | |
1110 | ||
1111 | //--------------------------------------------------------------------------- | |
1112 | AliESDVertex AliVertexerTracks::TrackletVertexFinder(AliStrLine **lines, const Int_t knacc, Int_t optUseWeights) | |
1113 | { | |
1114 | // Calculate the point at minimum distance to prepared tracks (array of AliStrLine) | |
1115 | ||
dc3719f3 | 1116 | Double_t initPos[3]={0.,0.,0.}; |
2d57349e | 1117 | |
2d57349e | 1118 | Double_t (*vectP0)[3]=new Double_t [knacc][3]; |
1119 | Double_t (*vectP1)[3]=new Double_t [knacc][3]; | |
1120 | ||
1121 | Double_t sum[3][3]; | |
1122 | Double_t dsum[3]={0,0,0}; | |
146c29df | 1123 | TMatrixD sumWi(3,3); |
1124 | for(Int_t i=0;i<3;i++){ | |
1125 | for(Int_t j=0;j<3;j++){ | |
1126 | sum[i][j]=0; | |
1127 | sumWi(i,j)=0.; | |
1128 | } | |
1129 | } | |
1130 | ||
2d57349e | 1131 | for(Int_t i=0; i<knacc; i++){ |
8e104736 | 1132 | AliStrLine *line1 = lines[i]; |
dc3719f3 | 1133 | Double_t p0[3],cd[3],sigmasq[3]; |
146c29df | 1134 | Double_t wmat[9]; |
8c75f668 | 1135 | if(!line1) printf("ERROR %d %d\n",i,knacc); |
2d57349e | 1136 | line1->GetP0(p0); |
1137 | line1->GetCd(cd); | |
dc3719f3 | 1138 | line1->GetSigma2P0(sigmasq); |
146c29df | 1139 | line1->GetWMatrix(wmat); |
1140 | TMatrixD wWi(3,3); | |
1141 | Int_t iel=0; | |
1142 | for(Int_t ia=0;ia<3;ia++){ | |
1143 | for(Int_t ib=0;ib<3;ib++){ | |
1144 | wWi(ia,ib)=wmat[iel]; | |
1145 | iel++; | |
1146 | } | |
1147 | } | |
1148 | ||
1149 | sumWi+=wWi; | |
1150 | ||
2d57349e | 1151 | Double_t p1[3]={p0[0]+cd[0],p0[1]+cd[1],p0[2]+cd[2]}; |
1152 | vectP0[i][0]=p0[0]; | |
1153 | vectP0[i][1]=p0[1]; | |
1154 | vectP0[i][2]=p0[2]; | |
1155 | vectP1[i][0]=p1[0]; | |
1156 | vectP1[i][1]=p1[1]; | |
1157 | vectP1[i][2]=p1[2]; | |
1158 | ||
1159 | Double_t matr[3][3]; | |
1160 | Double_t dknow[3]; | |
1161 | if(optUseWeights==0)GetStrLinDerivMatrix(p0,p1,matr,dknow); | |
dc3719f3 | 1162 | else GetStrLinDerivMatrix(p0,p1,sigmasq,matr,dknow); |
1163 | ||
2d57349e | 1164 | |
1165 | for(Int_t iii=0;iii<3;iii++){ | |
1166 | dsum[iii]+=dknow[iii]; | |
1167 | for(Int_t lj=0;lj<3;lj++) sum[iii][lj]+=matr[iii][lj]; | |
1168 | } | |
2d57349e | 1169 | } |
146c29df | 1170 | |
1171 | TMatrixD invsumWi(TMatrixD::kInverted,sumWi); | |
1172 | Double_t covmatrix[6]; | |
1173 | covmatrix[0] = invsumWi(0,0); | |
1174 | covmatrix[1] = invsumWi(0,1); | |
1175 | covmatrix[2] = invsumWi(1,1); | |
1176 | covmatrix[3] = invsumWi(0,2); | |
1177 | covmatrix[4] = invsumWi(1,2); | |
1178 | covmatrix[5] = invsumWi(2,2); | |
1179 | ||
2d57349e | 1180 | Double_t vett[3][3]; |
1181 | Double_t det=GetDeterminant3X3(sum); | |
dc3719f3 | 1182 | Double_t sigma=0; |
2d57349e | 1183 | |
fee9ef0d | 1184 | if(det!=0){ |
1185 | for(Int_t zz=0;zz<3;zz++){ | |
1186 | for(Int_t ww=0;ww<3;ww++){ | |
1187 | for(Int_t kk=0;kk<3;kk++) vett[ww][kk]=sum[ww][kk]; | |
1188 | } | |
1189 | for(Int_t kk=0;kk<3;kk++) vett[kk][zz]=dsum[kk]; | |
1190 | initPos[zz]=GetDeterminant3X3(vett)/det; | |
1191 | } | |
1192 | ||
1193 | ||
1194 | for(Int_t i=0; i<knacc; i++){ | |
1195 | Double_t p0[3]={0,0,0},p1[3]={0,0,0}; | |
1196 | for(Int_t ii=0;ii<3;ii++){ | |
1197 | p0[ii]=vectP0[i][ii]; | |
1198 | p1[ii]=vectP1[i][ii]; | |
1199 | } | |
1200 | sigma+=GetStrLinMinDist(p0,p1,initPos); | |
1201 | } | |
1202 | ||
f09c879d | 1203 | if(sigma>0.) {sigma=TMath::Sqrt(sigma);}else{sigma=999;} |
fee9ef0d | 1204 | }else{ |
50ff0bcd | 1205 | sigma=999; |
1206 | } | |
146c29df | 1207 | AliESDVertex theVert(initPos,covmatrix,99999.,knacc); |
1208 | theVert.SetDispersion(sigma); | |
50ff0bcd | 1209 | delete vectP0; |
1210 | delete vectP1; | |
dc3719f3 | 1211 | return theVert; |
50ff0bcd | 1212 | } |
8e104736 | 1213 | |
50ff0bcd | 1214 | //--------------------------------------------------------------------------- |
6d8df534 | 1215 | Bool_t AliVertexerTracks::TrackToPoint(AliExternalTrackParam *t, |
0bf2e2b4 | 1216 | TMatrixD &ri,TMatrixD &wWi, |
1217 | Bool_t uUi3by3) const | |
fee9ef0d | 1218 | { |
1219 | // | |
6d8df534 | 1220 | // Extract from the AliExternalTrackParam the global coordinates ri and covariance matrix |
fee9ef0d | 1221 | // wWi of the space point that it represents (to be used in VertexFitter()) |
1222 | // | |
1223 | ||
1224 | ||
1225 | Double_t rotAngle = t->GetAlpha(); | |
1226 | if(rotAngle<0.) rotAngle += 2.*TMath::Pi(); | |
1227 | Double_t cosRot = TMath::Cos(rotAngle); | |
1228 | Double_t sinRot = TMath::Sin(rotAngle); | |
1229 | ||
1230 | ri(0,0) = t->GetX()*cosRot-t->GetY()*sinRot; | |
1231 | ri(1,0) = t->GetX()*sinRot+t->GetY()*cosRot; | |
1232 | ri(2,0) = t->GetZ(); | |
1233 | ||
0bf2e2b4 | 1234 | |
1235 | ||
1236 | if(!uUi3by3) { | |
1237 | // matrix to go from global (x,y,z) to local (y,z); | |
1238 | TMatrixD qQi(2,3); | |
1239 | qQi(0,0) = -sinRot; | |
1240 | qQi(0,1) = cosRot; | |
1241 | qQi(0,2) = 0.; | |
1242 | qQi(1,0) = 0.; | |
1243 | qQi(1,1) = 0.; | |
1244 | qQi(1,2) = 1.; | |
1245 | ||
1246 | // covariance matrix of local (y,z) - inverted | |
0bf2e2b4 | 1247 | TMatrixD uUi(2,2); |
6d8df534 | 1248 | uUi(0,0) = t->GetSigmaY2(); |
1249 | uUi(0,1) = t->GetSigmaZY(); | |
1250 | uUi(1,0) = t->GetSigmaZY(); | |
1251 | uUi(1,1) = t->GetSigmaZ2(); | |
919e537f | 1252 | //printf(" Ui :"); |
1253 | //printf(" %f %f",uUi(0,0),uUi(0,1)); | |
1254 | //printf(" %f %f",uUi(1,0),uUi(1,1)); | |
0bf2e2b4 | 1255 | |
1256 | if(uUi.Determinant() <= 0.) return kFALSE; | |
1257 | TMatrixD uUiInv(TMatrixD::kInverted,uUi); | |
1258 | ||
1259 | // weights matrix: wWi = qQiT * uUiInv * qQi | |
1260 | TMatrixD uUiInvQi(uUiInv,TMatrixD::kMult,qQi); | |
1261 | TMatrixD m(qQi,TMatrixD::kTransposeMult,uUiInvQi); | |
1262 | wWi = m; | |
1263 | } else { | |
1264 | if(fVert.GetNContributors()<1) AliFatal("Vertex from finder is empty"); | |
1265 | // matrix to go from global (x,y,z) to local (x,y,z); | |
1266 | TMatrixD qQi(3,3); | |
1267 | qQi(0,0) = cosRot; | |
1268 | qQi(0,1) = sinRot; | |
1269 | qQi(0,2) = 0.; | |
1270 | qQi(1,0) = -sinRot; | |
1271 | qQi(1,1) = cosRot; | |
1272 | qQi(1,2) = 0.; | |
1273 | qQi(2,0) = 0.; | |
1274 | qQi(2,1) = 0.; | |
1275 | qQi(2,2) = 1.; | |
1276 | ||
1277 | // covariance of fVert along the track | |
1278 | Double_t p[3],pt,ptot; | |
1279 | t->GetPxPyPz(p); | |
1280 | pt = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]); | |
1281 | ptot = TMath::Sqrt(pt*pt+p[2]*p[2]); | |
3b768a1d | 1282 | Double_t cphi = p[0]/pt; //cos(phi)=px/pt |
1283 | Double_t sphi = p[1]/pt; //sin(phi)=py/pt | |
1284 | Double_t clambda = pt/ptot; //cos(lambda)=pt/ptot | |
1285 | Double_t slambda = p[2]/ptot; //sin(lambda)=pz/ptot | |
0bf2e2b4 | 1286 | Double_t covfVert[6]; |
1287 | fVert.GetCovMatrix(covfVert); | |
1288 | Double_t covfVertalongt = | |
3b768a1d | 1289 | covfVert[0]*cphi*cphi*clambda*clambda |
1290 | +covfVert[1]*2.*cphi*sphi*clambda*clambda | |
1291 | +covfVert[3]*2.*cphi*clambda*slambda | |
1292 | +covfVert[2]*sphi*sphi*clambda*clambda | |
1293 | +covfVert[4]*2.*sphi*clambda*slambda | |
1294 | +covfVert[5]*slambda*slambda; | |
0bf2e2b4 | 1295 | // covariance matrix of local (x,y,z) - inverted |
1296 | TMatrixD uUi(3,3); | |
3b768a1d | 1297 | uUi(0,0) = covfVertalongt * fnSigmaForUi00 * fnSigmaForUi00; |
919e537f | 1298 | AliDebug(1,Form("=====> sqrtUi00 cm %f",TMath::Sqrt(uUi(0,0)))); |
0bf2e2b4 | 1299 | uUi(0,1) = 0.; |
1300 | uUi(0,2) = 0.; | |
1301 | uUi(1,0) = 0.; | |
6d8df534 | 1302 | uUi(1,1) = t->GetSigmaY2(); |
1303 | uUi(1,2) = t->GetSigmaZY(); | |
0bf2e2b4 | 1304 | uUi(2,0) = 0.; |
6d8df534 | 1305 | uUi(2,1) = t->GetSigmaZY(); |
1306 | uUi(2,2) = t->GetSigmaZ2(); | |
0bf2e2b4 | 1307 | //printf(" Ui :\n"); |
1308 | //printf(" %f %f\n",uUi(0,0),uUi(0,1)); | |
1309 | //printf(" %f %f\n",uUi(1,0),uUi(1,1)); | |
fee9ef0d | 1310 | |
0bf2e2b4 | 1311 | if(uUi.Determinant() <= 0.) return kFALSE; |
1312 | TMatrixD uUiInv(TMatrixD::kInverted,uUi); | |
1313 | ||
1314 | // weights matrix: wWi = qQiT * uUiInv * qQi | |
1315 | TMatrixD uUiInvQi(uUiInv,TMatrixD::kMult,qQi); | |
1316 | TMatrixD m(qQi,TMatrixD::kTransposeMult,uUiInvQi); | |
1317 | wWi = m; | |
1318 | } | |
1319 | ||
fee9ef0d | 1320 | |
1321 | return kTRUE; | |
1322 | } | |
1323 | //--------------------------------------------------------------------------- | |
6d8df534 | 1324 | void AliVertexerTracks::TooFewTracks() |
fee9ef0d | 1325 | { |
50ff0bcd | 1326 | // |
6d8df534 | 1327 | // When the number of tracks is < fMinTracks, |
1328 | // deal with vertices not found and prepare to exit | |
50ff0bcd | 1329 | // |
919e537f | 1330 | AliDebug(1,"TooFewTracks"); |
2d57349e | 1331 | |
50ff0bcd | 1332 | Double_t pos[3],err[3]; |
50ff0bcd | 1333 | pos[0] = fNominalPos[0]; |
1334 | err[0] = TMath::Sqrt(fNominalCov[0]); | |
1335 | pos[1] = fNominalPos[1]; | |
1336 | err[1] = TMath::Sqrt(fNominalCov[2]); | |
6d8df534 | 1337 | pos[2] = fNominalPos[2]; |
1338 | err[2] = TMath::Sqrt(fNominalCov[5]); | |
1339 | Int_t ncontr = (err[0]>1. ? -1 : -3); | |
5b78b791 | 1340 | if(fCurrentVertex) { delete fCurrentVertex; fCurrentVertex=0; } |
50ff0bcd | 1341 | fCurrentVertex = new AliESDVertex(pos,err); |
1342 | fCurrentVertex->SetNContributors(ncontr); | |
2d57349e | 1343 | |
fee9ef0d | 1344 | if(fConstraint) { |
1345 | fCurrentVertex->SetTitle("VertexerTracksWithConstraint"); | |
1346 | } else { | |
50ff0bcd | 1347 | fCurrentVertex->SetTitle("VertexerTracksNoConstraint"); |
fee9ef0d | 1348 | } |
2d57349e | 1349 | |
6d8df534 | 1350 | if(!fTrkArraySel.IsEmpty()) fTrkArraySel.Delete(); |
44a76311 | 1351 | if(fIdSel) {delete fIdSel; fIdSel=NULL;} |
1352 | if(fTrksToSkip) {delete fTrksToSkip; fTrksToSkip=NULL;} | |
6d8df534 | 1353 | |
50ff0bcd | 1354 | return; |
1355 | } | |
1356 | //--------------------------------------------------------------------------- | |
fee9ef0d | 1357 | void AliVertexerTracks::VertexFinder(Int_t optUseWeights) |
1358 | { | |
2d57349e | 1359 | |
50ff0bcd | 1360 | // Get estimate of vertex position in (x,y) from tracks DCA |
1361 | ||
1362 | Double_t initPos[3]; | |
1363 | initPos[2] = 0.; | |
1364 | for(Int_t i=0;i<2;i++)initPos[i]=fNominalPos[i]; | |
6d8df534 | 1365 | Int_t nacc = (Int_t)fTrkArraySel.GetEntriesFast(); |
50ff0bcd | 1366 | Double_t aver[3]={0.,0.,0.}; |
1367 | Double_t aversq[3]={0.,0.,0.}; | |
1368 | Double_t sigmasq[3]={0.,0.,0.}; | |
1369 | Double_t sigma=0; | |
1370 | Int_t ncombi = 0; | |
6d8df534 | 1371 | AliExternalTrackParam *track1; |
1372 | AliExternalTrackParam *track2; | |
50ff0bcd | 1373 | Double_t pos[3],dir[3]; |
1374 | Double_t alpha,mindist; | |
2d57349e | 1375 | |
50ff0bcd | 1376 | for(Int_t i=0; i<nacc; i++){ |
6d8df534 | 1377 | track1 = (AliExternalTrackParam*)fTrkArraySel.At(i); |
50ff0bcd | 1378 | alpha=track1->GetAlpha(); |
1379 | mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; | |
f09c879d | 1380 | track1->GetXYZAt(mindist,GetFieldkG(),pos); |
1381 | track1->GetPxPyPzAt(mindist,GetFieldkG(),dir); | |
50ff0bcd | 1382 | AliStrLine *line1 = new AliStrLine(pos,dir); |
2d57349e | 1383 | |
50ff0bcd | 1384 | // AliStrLine *line1 = new AliStrLine(); |
f09c879d | 1385 | // track1->ApproximateHelixWithLine(mindist,GetFieldkG(),line1); |
50ff0bcd | 1386 | |
1387 | for(Int_t j=i+1; j<nacc; j++){ | |
6d8df534 | 1388 | track2 = (AliExternalTrackParam*)fTrkArraySel.At(j); |
50ff0bcd | 1389 | alpha=track2->GetAlpha(); |
1390 | mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; | |
f09c879d | 1391 | track2->GetXYZAt(mindist,GetFieldkG(),pos); |
1392 | track2->GetPxPyPzAt(mindist,GetFieldkG(),dir); | |
50ff0bcd | 1393 | AliStrLine *line2 = new AliStrLine(pos,dir); |
1394 | // AliStrLine *line2 = new AliStrLine(); | |
f09c879d | 1395 | // track2->ApproximateHelixWithLine(mindist,GetFieldkG(),line2); |
50ff0bcd | 1396 | Double_t distCA=line2->GetDCA(line1); |
fee9ef0d | 1397 | //printf("%d %d %f\n",i,j,distCA); |
1398 | if(fDCAcut<=0 || (fDCAcut>0&&distCA<fDCAcut)){ | |
50ff0bcd | 1399 | Double_t pnt1[3],pnt2[3],crosspoint[3]; |
2d57349e | 1400 | |
50ff0bcd | 1401 | if(optUseWeights<=0){ |
1402 | Int_t retcode = line2->Cross(line1,crosspoint); | |
1403 | if(retcode>=0){ | |
1404 | ncombi++; | |
1405 | for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj]; | |
1406 | for(Int_t jj=0;jj<3;jj++)aversq[jj]+=(crosspoint[jj]*crosspoint[jj]); | |
1407 | } | |
1408 | } | |
1409 | if(optUseWeights>0){ | |
1410 | Int_t retcode = line1->CrossPoints(line2,pnt1,pnt2); | |
1411 | if(retcode>=0){ | |
5c03260f | 1412 | Double_t cs, sn; |
50ff0bcd | 1413 | alpha=track1->GetAlpha(); |
1414 | cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); | |
1415 | Double_t sx1=sn*sn*track1->GetSigmaY2(), sy1=cs*cs*track1->GetSigmaY2(); | |
1416 | alpha=track2->GetAlpha(); | |
1417 | cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); | |
1418 | Double_t sx2=sn*sn*track2->GetSigmaY2(), sy2=cs*cs*track2->GetSigmaY2(); | |
1419 | Double_t sz1=track1->GetSigmaZ2(), sz2=track2->GetSigmaZ2(); | |
1420 | Double_t wx1=sx2/(sx1+sx2), wx2=1.- wx1; | |
1421 | Double_t wy1=sy2/(sy1+sy2), wy2=1.- wy1; | |
1422 | Double_t wz1=sz2/(sz1+sz2), wz2=1.- wz1; | |
1423 | crosspoint[0]=wx1*pnt1[0] + wx2*pnt2[0]; | |
1424 | crosspoint[1]=wy1*pnt1[1] + wy2*pnt2[1]; | |
1425 | crosspoint[2]=wz1*pnt1[2] + wz2*pnt2[2]; | |
1426 | ||
1427 | ncombi++; | |
1428 | for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj]; | |
1429 | for(Int_t jj=0;jj<3;jj++)aversq[jj]+=(crosspoint[jj]*crosspoint[jj]); | |
1430 | } | |
1431 | } | |
1432 | } | |
1433 | delete line2; | |
1434 | } | |
1435 | delete line1; | |
71d84967 | 1436 | } |
50ff0bcd | 1437 | if(ncombi>0){ |
1438 | for(Int_t jj=0;jj<3;jj++){ | |
1439 | initPos[jj] = aver[jj]/ncombi; | |
fee9ef0d | 1440 | //printf("%f\n",initPos[jj]); |
50ff0bcd | 1441 | aversq[jj]/=ncombi; |
1442 | sigmasq[jj]=aversq[jj]-initPos[jj]*initPos[jj]; | |
1443 | sigma+=sigmasq[jj]; | |
1444 | } | |
1445 | sigma=TMath::Sqrt(TMath::Abs(sigma)); | |
1446 | } | |
1447 | else { | |
1448 | Warning("VertexFinder","Finder did not succed"); | |
1449 | sigma=999; | |
1450 | } | |
1451 | fVert.SetXYZ(initPos); | |
1452 | fVert.SetDispersion(sigma); | |
1453 | fVert.SetNContributors(ncombi); | |
2d57349e | 1454 | } |
ec1be5d5 | 1455 | //--------------------------------------------------------------------------- |
6d8df534 | 1456 | void AliVertexerTracks::VertexFitter() |
fee9ef0d | 1457 | { |
ec1be5d5 | 1458 | // |
1459 | // The optimal estimate of the vertex position is given by a "weighted | |
0bf2e2b4 | 1460 | // average of tracks positions". |
fee9ef0d | 1461 | // Original method: V. Karimaki, CMS Note 97/0051 |
ec1be5d5 | 1462 | // |
6d8df534 | 1463 | Bool_t useConstraint = fConstraint; |
ec1be5d5 | 1464 | Double_t initPos[3]; |
0bf2e2b4 | 1465 | if(!fOnlyFitter) { |
1466 | fVert.GetXYZ(initPos); | |
1467 | } else { | |
1468 | initPos[0]=fNominalPos[0]; | |
1469 | initPos[1]=fNominalPos[1]; | |
1470 | initPos[2]=fNominalPos[2]; | |
1471 | } | |
1472 | ||
6d8df534 | 1473 | Int_t nTrksSel = (Int_t)fTrkArraySel.GetEntries(); |
1474 | if(nTrksSel==1) useConstraint=kTRUE; | |
919e537f | 1475 | AliDebug(1,"--- VertexFitter(): start"); |
1476 | AliDebug(1,Form(" Number of tracks in array: %d\n",nTrksSel)); | |
1477 | AliDebug(1,Form(" Minimum # tracks required in fit: %d\n",fMinTracks)); | |
1478 | AliDebug(1,Form(" Vertex position after finder: %f,%f,%f\n",initPos[0],initPos[1],initPos[2])); | |
1479 | 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]))); | |
ec1be5d5 | 1480 | |
0bf2e2b4 | 1481 | // special treatment for few-tracks fits (e.g. secondary vertices) |
6d8df534 | 1482 | Bool_t uUi3by3 = kFALSE; if(nTrksSel<5 && !useConstraint) uUi3by3 = kTRUE; |
0bf2e2b4 | 1483 | |
ec1be5d5 | 1484 | Int_t i,j,k,step=0; |
1485 | TMatrixD rv(3,1); | |
1486 | TMatrixD vV(3,3); | |
1487 | rv(0,0) = initPos[0]; | |
1488 | rv(1,0) = initPos[1]; | |
1489 | rv(2,0) = 0.; | |
1490 | Double_t xlStart,alpha; | |
6d8df534 | 1491 | Int_t nTrksUsed; |
fee9ef0d | 1492 | Double_t chi2,chi2i,chi2b; |
6d8df534 | 1493 | AliExternalTrackParam *t = 0; |
ec1be5d5 | 1494 | Int_t failed = 0; |
1495 | ||
50ff0bcd | 1496 | // initial vertex covariance matrix |
1497 | TMatrixD vVb(3,3); | |
1498 | vVb(0,0) = fNominalCov[0]; | |
1499 | vVb(0,1) = fNominalCov[1]; | |
1500 | vVb(0,2) = 0.; | |
1501 | vVb(1,0) = fNominalCov[1]; | |
1502 | vVb(1,1) = fNominalCov[2]; | |
1503 | vVb(1,2) = 0.; | |
1504 | vVb(2,0) = 0.; | |
1505 | vVb(2,1) = 0.; | |
1506 | vVb(2,2) = fNominalCov[5]; | |
1507 | TMatrixD vVbInv(TMatrixD::kInverted,vVb); | |
1508 | TMatrixD rb(3,1); | |
1509 | rb(0,0) = fNominalPos[0]; | |
1510 | rb(1,0) = fNominalPos[1]; | |
1511 | rb(2,0) = fNominalPos[2]; | |
1512 | TMatrixD vVbInvrb(vVbInv,TMatrixD::kMult,rb); | |
1513 | ||
1514 | ||
eae1677e | 1515 | // 2 steps: |
1516 | // 1st - estimate of vtx using all tracks | |
1517 | // 2nd - estimate of global chi2 | |
1518 | for(step=0; step<2; step++) { | |
919e537f | 1519 | AliDebug(1,Form(" step = %d\n",step)); |
ec1be5d5 | 1520 | chi2 = 0.; |
6d8df534 | 1521 | nTrksUsed = 0; |
ec1be5d5 | 1522 | |
0bf2e2b4 | 1523 | if(step==1) { initPos[0]=rv(0,0); initPos[0]=rv(1,0); } |
1524 | ||
ec1be5d5 | 1525 | TMatrixD sumWiri(3,1); |
1526 | TMatrixD sumWi(3,3); | |
1527 | for(i=0; i<3; i++) { | |
1528 | sumWiri(i,0) = 0.; | |
1529 | for(j=0; j<3; j++) sumWi(j,i) = 0.; | |
1530 | } | |
1531 | ||
fee9ef0d | 1532 | // mean vertex constraint |
1533 | if(useConstraint) { | |
50ff0bcd | 1534 | for(i=0;i<3;i++) { |
1535 | sumWiri(i,0) += vVbInvrb(i,0); | |
1536 | for(k=0;k<3;k++) sumWi(i,k) += vVbInv(i,k); | |
07680cae | 1537 | } |
fee9ef0d | 1538 | // chi2 |
1539 | TMatrixD deltar = rv; deltar -= rb; | |
1540 | TMatrixD vVbInvdeltar(vVbInv,TMatrixD::kMult,deltar); | |
1541 | chi2b = deltar(0,0)*vVbInvdeltar(0,0)+ | |
1542 | deltar(1,0)*vVbInvdeltar(1,0)+ | |
1543 | deltar(2,0)*vVbInvdeltar(2,0); | |
1544 | chi2 += chi2b; | |
07680cae | 1545 | } |
1546 | ||
ec1be5d5 | 1547 | // loop on tracks |
6d8df534 | 1548 | for(k=0; k<nTrksSel; k++) { |
ec1be5d5 | 1549 | // get track from track array |
6d8df534 | 1550 | t = (AliExternalTrackParam*)fTrkArraySel.At(k); |
ec1be5d5 | 1551 | alpha = t->GetAlpha(); |
1552 | xlStart = initPos[0]*TMath::Cos(alpha)+initPos[1]*TMath::Sin(alpha); | |
fee9ef0d | 1553 | // to vtxSeed (from finder) |
6d8df534 | 1554 | t->PropagateTo(xlStart,GetFieldkG()); |
fee9ef0d | 1555 | |
ec1be5d5 | 1556 | // vector of track global coordinates |
1557 | TMatrixD ri(3,1); | |
fee9ef0d | 1558 | // covariance matrix of ri |
1559 | TMatrixD wWi(3,3); | |
1560 | ||
1561 | // get space point from track | |
0bf2e2b4 | 1562 | if(!TrackToPoint(t,ri,wWi,uUi3by3)) continue; |
fee9ef0d | 1563 | TMatrixD wWiri(wWi,TMatrixD::kMult,ri); |
ec1be5d5 | 1564 | |
1565 | // track chi2 | |
1566 | TMatrixD deltar = rv; deltar -= ri; | |
1567 | TMatrixD wWideltar(wWi,TMatrixD::kMult,deltar); | |
1568 | chi2i = deltar(0,0)*wWideltar(0,0)+ | |
1569 | deltar(1,0)*wWideltar(1,0)+ | |
1570 | deltar(2,0)*wWideltar(2,0); | |
1571 | ||
ec1be5d5 | 1572 | // add to total chi2 |
1573 | chi2 += chi2i; | |
1574 | ||
ec1be5d5 | 1575 | sumWiri += wWiri; |
1576 | sumWi += wWi; | |
1577 | ||
6d8df534 | 1578 | nTrksUsed++; |
ec1be5d5 | 1579 | } // end loop on tracks |
1580 | ||
6d8df534 | 1581 | if(nTrksUsed < fMinTracks) { |
ec1be5d5 | 1582 | failed=1; |
1583 | continue; | |
1584 | } | |
1585 | ||
1586 | Double_t determinant = sumWi.Determinant(); | |
f09c879d | 1587 | if(determinant < fMinDetFitter) { |
919e537f | 1588 | AliDebug(1,Form("det(V) = %f (<%f)\n",determinant,fMinDetFitter)); |
ec1be5d5 | 1589 | failed=1; |
1590 | continue; | |
1591 | } | |
1592 | ||
0bf2e2b4 | 1593 | if(step==0) { |
1594 | // inverted of weights matrix | |
1595 | TMatrixD invsumWi(TMatrixD::kInverted,sumWi); | |
1596 | vV = invsumWi; | |
1597 | // position of primary vertex | |
1598 | rv.Mult(vV,sumWiri); | |
1599 | } | |
eae1677e | 1600 | } // end loop on the 2 steps |
ec1be5d5 | 1601 | |
ec1be5d5 | 1602 | if(failed) { |
6d8df534 | 1603 | TooFewTracks(); |
ec1be5d5 | 1604 | return; |
1605 | } | |
1606 | ||
1607 | Double_t position[3]; | |
1608 | position[0] = rv(0,0); | |
1609 | position[1] = rv(1,0); | |
1610 | position[2] = rv(2,0); | |
1611 | Double_t covmatrix[6]; | |
1612 | covmatrix[0] = vV(0,0); | |
1613 | covmatrix[1] = vV(0,1); | |
1614 | covmatrix[2] = vV(1,1); | |
1615 | covmatrix[3] = vV(0,2); | |
1616 | covmatrix[4] = vV(1,2); | |
1617 | covmatrix[5] = vV(2,2); | |
1618 | ||
dc3719f3 | 1619 | // for correct chi2/ndf, count constraint as additional "track" |
6d8df534 | 1620 | if(fConstraint) nTrksUsed++; |
ec1be5d5 | 1621 | // store data in the vertex object |
5b78b791 | 1622 | if(fCurrentVertex) { delete fCurrentVertex; fCurrentVertex=0; } |
6d8df534 | 1623 | fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nTrksUsed); |
ec1be5d5 | 1624 | |
919e537f | 1625 | AliDebug(1," Vertex after fit:"); |
1626 | AliDebug(1,Form("xyz: %f %f %f; nc %d",fCurrentVertex->GetXv(),fCurrentVertex->GetYv(),fCurrentVertex->GetZv(),fCurrentVertex->GetNContributors())); | |
1627 | AliDebug(1,"--- VertexFitter(): finish\n"); | |
1628 | ||
ec1be5d5 | 1629 | |
1630 | return; | |
1631 | } | |
50ff0bcd | 1632 | //---------------------------------------------------------------------------- |
6d8df534 | 1633 | AliESDVertex* AliVertexerTracks::VertexForSelectedTracks(TObjArray *trkArray, |
1634 | UShort_t *id, | |
1635 | Bool_t optUseFitter, | |
97669588 | 1636 | Bool_t optPropagate, |
1637 | Bool_t optUseDiamondConstraint) | |
fee9ef0d | 1638 | { |
eae1677e | 1639 | // |
6d8df534 | 1640 | // Return vertex from tracks (AliExternalTrackParam) in array |
eae1677e | 1641 | // |
5b78b791 | 1642 | fCurrentVertex = 0; |
97669588 | 1643 | // set optUseDiamondConstraint=TRUE only if you are reconstructing the |
1644 | // primary vertex! | |
1645 | if(optUseDiamondConstraint) { | |
1646 | SetConstraintOn(); | |
1647 | } else { | |
1648 | SetConstraintOff(); | |
1649 | } | |
fee9ef0d | 1650 | |
50ff0bcd | 1651 | // get tracks and propagate them to initial vertex position |
6d8df534 | 1652 | fIdSel = new UShort_t[(Int_t)trkArray->GetEntriesFast()]; |
1653 | Int_t nTrksSel = PrepareTracks(*trkArray,id,0); | |
97669588 | 1654 | if((!optUseDiamondConstraint && nTrksSel<TMath::Max(2,fMinTracks)) || |
1655 | (optUseDiamondConstraint && nTrksSel<1)) { | |
6d8df534 | 1656 | TooFewTracks(); |
fee9ef0d | 1657 | return fCurrentVertex; |
50ff0bcd | 1658 | } |
1659 | ||
6d8df534 | 1660 | // vertex finder |
97669588 | 1661 | if(nTrksSel==1) { |
1662 | AliDebug(1,"Just one track"); | |
1663 | OneTrackVertFinder(); | |
1664 | } else { | |
1665 | switch (fAlgo) { | |
1666 | case 1: StrLinVertexFinderMinDist(1); break; | |
1667 | case 2: StrLinVertexFinderMinDist(0); break; | |
1668 | case 3: HelixVertexFinder(); break; | |
1669 | case 4: VertexFinder(1); break; | |
1670 | case 5: VertexFinder(0); break; | |
1671 | default: printf("Wrong algorithm\n"); break; | |
1672 | } | |
fee9ef0d | 1673 | } |
919e537f | 1674 | AliDebug(1," Vertex finding completed\n"); |
fee9ef0d | 1675 | |
1676 | // vertex fitter | |
6d8df534 | 1677 | if(optUseFitter) { |
1678 | VertexFitter(); | |
1679 | } else { | |
fee9ef0d | 1680 | Double_t position[3]={fVert.GetXv(),fVert.GetYv(),fVert.GetZv()}; |
146c29df | 1681 | Double_t covmatrix[6]; |
1682 | fVert.GetCovMatrix(covmatrix); | |
fee9ef0d | 1683 | Double_t chi2=99999.; |
6d8df534 | 1684 | Int_t nTrksUsed=fVert.GetNContributors(); |
1685 | fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nTrksUsed); | |
fee9ef0d | 1686 | } |
1687 | fCurrentVertex->SetDispersion(fVert.GetDispersion()); | |
1688 | ||
1689 | ||
1690 | // set indices of used tracks and propagate track to found vertex | |
50ff0bcd | 1691 | UShort_t *indices = 0; |
6d8df534 | 1692 | Double_t d0z0[2],covd0z0[3]; |
1693 | AliExternalTrackParam *t = 0; | |
fee9ef0d | 1694 | if(fCurrentVertex->GetNContributors()>0) { |
44a76311 | 1695 | indices = new UShort_t[fTrkArraySel.GetEntriesFast()]; |
6d8df534 | 1696 | for(Int_t jj=0; jj<(Int_t)fTrkArraySel.GetEntriesFast(); jj++) { |
1697 | indices[jj] = fIdSel[jj]; | |
1698 | t = (AliExternalTrackParam*)fTrkArraySel.At(jj); | |
1699 | if(optPropagate && optUseFitter) { | |
fee9ef0d | 1700 | if(TMath::Sqrt(fCurrentVertex->GetXv()*fCurrentVertex->GetXv()+fCurrentVertex->GetYv()*fCurrentVertex->GetYv())<3.) { |
6d8df534 | 1701 | t->PropagateToDCA(fCurrentVertex,GetFieldkG(),100.,d0z0,covd0z0); |
919e537f | 1702 | AliDebug(1,Form("Track %d propagated to found vertex",jj)); |
6d8df534 | 1703 | } else { |
fee9ef0d | 1704 | AliWarning("Found vertex outside beam pipe!"); |
1705 | } | |
1706 | } | |
50ff0bcd | 1707 | } |
fee9ef0d | 1708 | fCurrentVertex->SetIndices(fCurrentVertex->GetNContributors(),indices); |
50ff0bcd | 1709 | } |
6d8df534 | 1710 | |
1711 | // clean up | |
44a76311 | 1712 | if (indices) {delete indices; indices=NULL;} |
1713 | delete fIdSel; fIdSel=NULL; | |
6d8df534 | 1714 | fTrkArraySel.Delete(); |
50ff0bcd | 1715 | |
fee9ef0d | 1716 | return fCurrentVertex; |
eae1677e | 1717 | } |
50ff0bcd | 1718 | //---------------------------------------------------------------------------- |
6d8df534 | 1719 | AliESDVertex* AliVertexerTracks::VertexForSelectedESDTracks(TObjArray *trkArray, |
97669588 | 1720 | Bool_t optUseFitter, |
1721 | Bool_t optPropagate, | |
1722 | Bool_t optUseDiamondConstraint) | |
1723 | ||
fee9ef0d | 1724 | { |
50ff0bcd | 1725 | // |
6d8df534 | 1726 | // Return vertex from array of ESD tracks |
50ff0bcd | 1727 | // |
5834e9a1 | 1728 | |
6d8df534 | 1729 | Int_t nTrks = (Int_t)trkArray->GetEntriesFast(); |
1730 | UShort_t *id = new UShort_t[nTrks]; | |
1731 | ||
1732 | AliESDtrack *esdt = 0; | |
50ff0bcd | 1733 | for(Int_t i=0; i<nTrks; i++){ |
6d8df534 | 1734 | esdt = (AliESDtrack*)trkArray->At(i); |
1735 | id[i] = (UShort_t)esdt->GetID(); | |
50ff0bcd | 1736 | } |
1737 | ||
97669588 | 1738 | VertexForSelectedTracks(trkArray,id,optUseFitter,optPropagate,optUseDiamondConstraint); |
6d8df534 | 1739 | |
44a76311 | 1740 | delete id; id=NULL; |
6d8df534 | 1741 | |
1742 | return fCurrentVertex; | |
50ff0bcd | 1743 | } |
1744 | //-------------------------------------------------------------------------- |