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