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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), |
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; |
146c29df | 123 | if(fTrksToSkip) { delete [] fTrksToSkip; fTrksToSkip=NULL; } |
6d8df534 | 124 | if(fIdSel) { delete [] fIdSel; fIdSel=NULL; } |
ec1be5d5 | 125 | } |
c5e3e5d1 | 126 | //---------------------------------------------------------------------------- |
0aa2faf4 | 127 | AliESDVertex* AliVertexerTracks::FindPrimaryVertex(const 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 | |
4539449a | 179 | if(!inputAOD) { // ESD |
0aa2faf4 | 180 | AliESDtrack* esdt = (AliESDtrack*)track; |
181 | if(esdt->GetNcls(fMode) < fMinClusters) continue; | |
4539449a | 182 | if(fMode==0) { // ITS mode |
183 | if(fITSrefit && !(esdt->GetStatus()&AliESDtrack::kITSrefit)) continue; | |
184 | Double_t x,p[5],cov[15]; | |
185 | esdt->GetExternalParameters(x,p); | |
186 | esdt->GetExternalCovariance(cov); | |
187 | t = new AliExternalTrackParam(x,esdt->GetAlpha(),p,cov); | |
188 | } else if(fMode==1) { // TPC mode | |
189 | t = (AliExternalTrackParam*)esdt->GetTPCInnerParam(); | |
190 | if(!t) continue; | |
191 | Double_t radius = 2.8; //something less than the beam pipe radius | |
192 | if(!PropagateTrackTo(t,radius)) continue; | |
193 | } | |
194 | } else { // AOD (only ITS mode) | |
195 | Int_t ncls0=0; | |
196 | for(Int_t l=0;l<6;l++) if(TESTBIT(track->GetITSClusterMap(),l)) ncls0++; | |
197 | if(ncls0 < fMinClusters) continue; | |
0aa2faf4 | 198 | t = new AliExternalTrackParam(track); |
50ff0bcd | 199 | } |
6d8df534 | 200 | trkArrayOrig.AddLast(t); |
0aa2faf4 | 201 | idOrig[nTrksOrig]=(UShort_t)track->GetID(); |
6d8df534 | 202 | nTrksOrig++; |
0aa2faf4 | 203 | } // end loop on tracks |
fee9ef0d | 204 | |
f09c879d | 205 | // call method that will reconstruct the vertex |
6d8df534 | 206 | FindPrimaryVertex(&trkArrayOrig,idOrig); |
207 | ||
4539449a | 208 | if(fMode==0) trkArrayOrig.Delete(); |
6d8df534 | 209 | delete [] idOrig; idOrig=NULL; |
f09c879d | 210 | |
211 | if(f) { | |
212 | f->Close(); delete f; f = NULL; | |
213 | gSystem->Unlink("VertexerTracks.root"); | |
214 | olddir->cd(); | |
215 | } | |
6d8df534 | 216 | |
217 | return fCurrentVertex; | |
218 | } | |
219 | //---------------------------------------------------------------------------- | |
220 | AliESDVertex* AliVertexerTracks::FindPrimaryVertex(TObjArray *trkArrayOrig, | |
221 | UShort_t *idOrig) | |
222 | { | |
223 | // | |
224 | // Primary vertex using the AliExternalTrackParam's in the TObjArray. | |
225 | // idOrig must contain the track IDs from AliESDtrack::GetID() | |
226 | // (Two iterations: | |
227 | // 1st with 5*fNSigma*sigma cut w.r.t. to initial vertex | |
228 | // + cut on sqrt(d0d0+z0z0) if fConstraint=kFALSE | |
229 | // 2nd with fNSigma*sigma cut w.r.t. to vertex found in 1st iteration) | |
230 | // | |
231 | fCurrentVertex = 0; | |
232 | ||
233 | // accept 1-track case only if constraint is available | |
234 | if(!fConstraint && fMinTracks==1) fMinTracks=2; | |
235 | ||
f09c879d | 236 | // read tracks from array |
6d8df534 | 237 | Int_t nTrksOrig = (Int_t)trkArrayOrig->GetEntriesFast(); |
919e537f | 238 | AliDebug(1,Form("Initial number of tracks: %d",nTrksOrig)); |
f09c879d | 239 | if(nTrksOrig<fMinTracks) { |
919e537f | 240 | AliDebug(1,"TooFewTracks"); |
6d8df534 | 241 | TooFewTracks(); |
242 | return fCurrentVertex; | |
243 | } | |
244 | ||
fee9ef0d | 245 | // If fConstraint=kFALSE |
246 | // run VertexFinder(1) to get rough estimate of initVertex (x,y) | |
247 | if(!fConstraint) { | |
6d8df534 | 248 | // fill fTrkArraySel, for VertexFinder() |
249 | fIdSel = new UShort_t[nTrksOrig]; | |
250 | PrepareTracks(*trkArrayOrig,idOrig,0); | |
251 | if(fIdSel) { delete [] fIdSel; fIdSel=NULL; } | |
252 | Double_t cutsave = fDCAcut; | |
f09c879d | 253 | fDCAcut = fDCAcutIter0; |
8c75f668 | 254 | // vertex finder |
255 | switch (fAlgoIter0) { | |
256 | case 1: StrLinVertexFinderMinDist(1); break; | |
257 | case 2: StrLinVertexFinderMinDist(0); break; | |
258 | case 3: HelixVertexFinder(); break; | |
259 | case 4: VertexFinder(1); break; | |
260 | case 5: VertexFinder(0); break; | |
261 | default: printf("Wrong algorithm\n"); break; | |
262 | } | |
fee9ef0d | 263 | fDCAcut = cutsave; |
fee9ef0d | 264 | if(fVert.GetNContributors()>0) { |
265 | fVert.GetXYZ(fNominalPos); | |
266 | fNominalPos[0] = fVert.GetXv(); | |
267 | fNominalPos[1] = fVert.GetYv(); | |
268 | fNominalPos[2] = fVert.GetZv(); | |
919e537f | 269 | AliDebug(1,Form("No mean vertex: VertexFinder gives (%f, %f, %f)",fNominalPos[0],fNominalPos[1],fNominalPos[2])); |
fee9ef0d | 270 | } else { |
271 | fNominalPos[0] = 0.; | |
272 | fNominalPos[1] = 0.; | |
273 | fNominalPos[2] = 0.; | |
919e537f | 274 | AliDebug(1,"No mean vertex and VertexFinder failed"); |
0c69be49 | 275 | } |
07680cae | 276 | } |
fee9ef0d | 277 | |
278 | // TWO ITERATIONS: | |
279 | // | |
280 | // ITERATION 1 | |
281 | // propagate tracks to fNominalPos vertex | |
282 | // preselect them: | |
283 | // if(constraint) reject for |d0|>5*fNSigma*sigma w.r.t. fNominal... vertex | |
284 | // else reject for |d0|\oplus|z0| > 5 mm w.r.t. fNominal... vertex | |
07680cae | 285 | // ITERATION 2 |
286 | // propagate tracks to best between initVertex and fCurrentVertex | |
287 | // preselect tracks (reject for |d0|>fNSigma*sigma w.r.t. best | |
288 | // between initVertex and fCurrentVertex) | |
6d8df534 | 289 | for(Int_t iter=1; iter<=2; iter++) { |
290 | if(fOnlyFitter && iter==1) continue; | |
291 | if(fIdSel) { delete [] fIdSel; fIdSel=NULL; } | |
292 | fIdSel = new UShort_t[nTrksOrig]; | |
293 | Int_t nTrksSel = PrepareTracks(*trkArrayOrig,idOrig,iter); | |
919e537f | 294 | AliDebug(1,Form("N tracks selected in iteration %d: %d",iter,nTrksSel)); |
6d8df534 | 295 | if(nTrksSel < fMinTracks) { |
296 | TooFewTracks(); | |
fee9ef0d | 297 | return fCurrentVertex; |
298 | } | |
07680cae | 299 | |
fee9ef0d | 300 | // vertex finder |
301 | if(!fOnlyFitter) { | |
6d8df534 | 302 | if(nTrksSel==1) { |
919e537f | 303 | AliDebug(1,"Just one track"); |
fee9ef0d | 304 | OneTrackVertFinder(); |
6d8df534 | 305 | } else { |
fee9ef0d | 306 | switch (fAlgo) { |
307 | case 1: StrLinVertexFinderMinDist(1); break; | |
308 | case 2: StrLinVertexFinderMinDist(0); break; | |
309 | case 3: HelixVertexFinder(); break; | |
310 | case 4: VertexFinder(1); break; | |
311 | case 5: VertexFinder(0); break; | |
919e537f | 312 | default: printf("Wrong algorithm"); break; |
fee9ef0d | 313 | } |
314 | } | |
919e537f | 315 | AliDebug(1," Vertex finding completed"); |
0c69be49 | 316 | } |
07680cae | 317 | |
fee9ef0d | 318 | // vertex fitter |
6d8df534 | 319 | VertexFitter(); |
fee9ef0d | 320 | } // end loop on the two iterations |
07680cae | 321 | |
fee9ef0d | 322 | |
50ff0bcd | 323 | // set indices of used tracks |
324 | UShort_t *indices = 0; | |
50ff0bcd | 325 | if(fCurrentVertex->GetNContributors()>0) { |
4d023a8f | 326 | Int_t nIndices = (Int_t)fTrkArraySel.GetEntriesFast(); |
327 | indices = new UShort_t[nIndices]; | |
328 | for(Int_t jj=0; jj<nIndices; jj++) | |
6d8df534 | 329 | indices[jj] = fIdSel[jj]; |
4d023a8f | 330 | fCurrentVertex->SetIndices(nIndices,indices); |
50ff0bcd | 331 | } |
6d8df534 | 332 | delete [] indices; indices=NULL; |
333 | // | |
fee9ef0d | 334 | |
6d8df534 | 335 | // set vertex title |
336 | TString title="VertexerTracksNoConstraint"; | |
337 | if(fConstraint) { | |
338 | title="VertexerTracksWithConstraint"; | |
339 | if(fOnlyFitter) title.Append("OnlyFitter"); | |
340 | } | |
341 | fCurrentVertex->SetTitle(title.Data()); | |
342 | // | |
a7ede274 | 343 | |
919e537f | 344 | AliDebug(1,Form("xyz: %f %f %f; nc %d",fCurrentVertex->GetXv(),fCurrentVertex->GetYv(),fCurrentVertex->GetZv(),fCurrentVertex->GetNContributors())); |
50ff0bcd | 345 | |
6d8df534 | 346 | // clean up |
347 | delete [] fIdSel; fIdSel=NULL; | |
348 | fTrkArraySel.Delete(); | |
146c29df | 349 | if(fTrksToSkip) { delete [] fTrksToSkip; fTrksToSkip=NULL; } |
6d8df534 | 350 | // |
fee9ef0d | 351 | |
07680cae | 352 | return fCurrentVertex; |
353 | } | |
50ff0bcd | 354 | //------------------------------------------------------------------------ |
fee9ef0d | 355 | Double_t AliVertexerTracks::GetDeterminant3X3(Double_t matr[][3]) |
356 | { | |
50ff0bcd | 357 | // |
358 | 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]; | |
359 | return det; | |
360 | } | |
361 | //------------------------------------------------------------------------- | |
fee9ef0d | 362 | void AliVertexerTracks::GetStrLinDerivMatrix(Double_t *p0,Double_t *p1,Double_t (*m)[3],Double_t *d) |
363 | { | |
50ff0bcd | 364 | // |
365 | Double_t x12=p0[0]-p1[0]; | |
366 | Double_t y12=p0[1]-p1[1]; | |
367 | Double_t z12=p0[2]-p1[2]; | |
368 | Double_t kk=x12*x12+y12*y12+z12*z12; | |
369 | m[0][0]=2-2/kk*x12*x12; | |
370 | m[0][1]=-2/kk*x12*y12; | |
371 | m[0][2]=-2/kk*x12*z12; | |
372 | m[1][0]=-2/kk*x12*y12; | |
373 | m[1][1]=2-2/kk*y12*y12; | |
374 | m[1][2]=-2/kk*y12*z12; | |
375 | m[2][0]=-2/kk*x12*z12; | |
376 | m[2][1]=-2*y12*z12; | |
377 | m[2][2]=2-2/kk*z12*z12; | |
378 | d[0]=2*p0[0]-2/kk*p0[0]*x12*x12-2/kk*p0[2]*x12*z12-2/kk*p0[1]*x12*y12; | |
379 | d[1]=2*p0[1]-2/kk*p0[1]*y12*y12-2/kk*p0[0]*x12*y12-2/kk*p0[2]*z12*y12; | |
380 | d[2]=2*p0[2]-2/kk*p0[2]*z12*z12-2/kk*p0[0]*x12*z12-2/kk*p0[1]*z12*y12; | |
c5e3e5d1 | 381 | |
50ff0bcd | 382 | } |
383 | //-------------------------------------------------------------------------- | |
fee9ef0d | 384 | void AliVertexerTracks::GetStrLinDerivMatrix(Double_t *p0,Double_t *p1,Double_t *sigmasq,Double_t (*m)[3],Double_t *d) |
385 | { | |
50ff0bcd | 386 | // |
387 | Double_t x12=p1[0]-p0[0]; | |
388 | Double_t y12=p1[1]-p0[1]; | |
389 | Double_t z12=p1[2]-p0[2]; | |
c5e3e5d1 | 390 | |
50ff0bcd | 391 | Double_t den= x12*x12*sigmasq[1]*sigmasq[2]+y12*y12*sigmasq[0]*sigmasq[2]+z12*z12*sigmasq[0]*sigmasq[1]; |
c5e3e5d1 | 392 | |
50ff0bcd | 393 | Double_t kk= 2*(x12*x12/sigmasq[0]+y12*y12/sigmasq[1]+z12*z12/sigmasq[2]); |
c5e3e5d1 | 394 | |
50ff0bcd | 395 | Double_t cc[3]; |
396 | cc[0]=-x12/sigmasq[0]; | |
397 | cc[1]=-y12/sigmasq[1]; | |
398 | cc[2]=-z12/sigmasq[2]; | |
ec1be5d5 | 399 | |
50ff0bcd | 400 | 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 | 401 | |
50ff0bcd | 402 | Double_t ss= -p0[0]*cc[0]-p0[1]*cc[1]-p0[2]*cc[2]; |
2d57349e | 403 | |
50ff0bcd | 404 | Double_t aa[3]; |
405 | aa[0]=x12*sigmasq[1]*sigmasq[2]/den; | |
406 | aa[1]=y12*sigmasq[0]*sigmasq[2]/den; | |
407 | aa[2]=z12*sigmasq[0]*sigmasq[1]/den; | |
2d57349e | 408 | |
50ff0bcd | 409 | m[0][0]=aa[0]*(aa[0]*kk+2*cc[0])+2*cc[0]*aa[0]+2/sigmasq[0]; |
410 | m[0][1]=aa[1]*(aa[0]*kk+2*cc[0])+2*cc[1]*aa[0]; | |
411 | m[0][2]=aa[2]*(aa[0]*kk+2*cc[0])+2*cc[2]*aa[0]; | |
2d57349e | 412 | |
50ff0bcd | 413 | m[1][0]=aa[0]*(aa[1]*kk+2*cc[1])+2*cc[0]*aa[1]; |
414 | m[1][1]=aa[1]*(aa[1]*kk+2*cc[1])+2*cc[1]*aa[1]+2/sigmasq[1]; | |
415 | m[1][2]=aa[2]*(aa[1]*kk+2*cc[1])+2*cc[2]*aa[1]; | |
2d57349e | 416 | |
50ff0bcd | 417 | m[2][0]=aa[0]*(aa[2]*kk+2*cc[2])+2*cc[0]*aa[2]; |
418 | m[2][1]=aa[1]*(aa[2]*kk+2*cc[2])+2*cc[1]*aa[2]; | |
419 | m[2][2]=aa[2]*(aa[2]*kk+2*cc[2])+2*cc[2]*aa[2]+2/sigmasq[2]; | |
08df6187 | 420 | |
50ff0bcd | 421 | d[0]=-ww*(aa[0]*kk+2*cc[0])-2*ss*aa[0]+2*p0[0]/sigmasq[0]; |
422 | d[1]=-ww*(aa[1]*kk+2*cc[1])-2*ss*aa[1]+2*p0[1]/sigmasq[1]; | |
423 | d[2]=-ww*(aa[2]*kk+2*cc[2])-2*ss*aa[2]+2*p0[2]/sigmasq[2]; | |
2d57349e | 424 | |
2d57349e | 425 | } |
50ff0bcd | 426 | //-------------------------------------------------------------------------- |
fee9ef0d | 427 | Double_t AliVertexerTracks::GetStrLinMinDist(Double_t *p0,Double_t *p1,Double_t *x0) |
428 | { | |
50ff0bcd | 429 | // |
430 | Double_t x12=p0[0]-p1[0]; | |
431 | Double_t y12=p0[1]-p1[1]; | |
432 | Double_t z12=p0[2]-p1[2]; | |
433 | Double_t x10=p0[0]-x0[0]; | |
434 | Double_t y10=p0[1]-x0[1]; | |
435 | Double_t z10=p0[2]-x0[2]; | |
3446476f | 436 | // 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 | 437 | return ((y10*z12-z10*y12)*(y10*z12-z10*y12)+ |
438 | (z10*x12-x10*z12)*(z10*x12-x10*z12)+ | |
439 | (x10*y12-y10*x12)*(x10*y12-y10*x12)) | |
440 | /(x12*x12+y12*y12+z12*z12); | |
2d57349e | 441 | } |
442 | //--------------------------------------------------------------------------- | |
fee9ef0d | 443 | void AliVertexerTracks::OneTrackVertFinder() |
444 | { | |
0c69be49 | 445 | // find vertex for events with 1 track, using DCA to nominal beam axis |
919e537f | 446 | AliDebug(1,Form("Number of prepared tracks =%d - Call OneTrackVertFinder",fTrkArraySel.GetEntries())); |
6d8df534 | 447 | AliExternalTrackParam *track1; |
448 | track1 = (AliExternalTrackParam*)fTrkArraySel.At(0); | |
0c69be49 | 449 | Double_t alpha=track1->GetAlpha(); |
450 | Double_t mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; | |
451 | Double_t pos[3],dir[3]; | |
f09c879d | 452 | track1->GetXYZAt(mindist,GetFieldkG(),pos); |
453 | track1->GetPxPyPzAt(mindist,GetFieldkG(),dir); | |
0c69be49 | 454 | AliStrLine *line1 = new AliStrLine(pos,dir); |
455 | Double_t p1[3]={fNominalPos[0],fNominalPos[1],0.}; | |
456 | Double_t p2[3]={fNominalPos[0],fNominalPos[1],10.}; | |
457 | AliStrLine *zeta=new AliStrLine(p1,p2,kTRUE); | |
458 | Double_t crosspoint[3]={0.,0.,0.}; | |
459 | Double_t sigma=999.; | |
460 | Int_t nContrib=-1; | |
461 | Int_t retcode = zeta->Cross(line1,crosspoint); | |
462 | if(retcode>=0){ | |
463 | sigma=line1->GetDistFromPoint(crosspoint); | |
464 | nContrib=1; | |
465 | } | |
466 | delete zeta; | |
467 | delete line1; | |
468 | fVert.SetXYZ(crosspoint); | |
469 | fVert.SetDispersion(sigma); | |
470 | fVert.SetNContributors(nContrib); | |
471 | } | |
472 | //--------------------------------------------------------------------------- | |
fee9ef0d | 473 | void AliVertexerTracks::HelixVertexFinder() |
474 | { | |
2d57349e | 475 | // Get estimate of vertex position in (x,y) from tracks DCA |
476 | ||
477 | ||
478 | Double_t initPos[3]; | |
479 | initPos[2] = 0.; | |
480 | for(Int_t i=0;i<2;i++)initPos[i]=fNominalPos[i]; | |
2d57349e | 481 | |
6d8df534 | 482 | Int_t nacc = (Int_t)fTrkArraySel.GetEntriesFast(); |
2d57349e | 483 | |
484 | Double_t aver[3]={0.,0.,0.}; | |
485 | Double_t averquad[3]={0.,0.,0.}; | |
486 | Double_t sigmaquad[3]={0.,0.,0.}; | |
487 | Double_t sigma=0; | |
488 | Int_t ncombi = 0; | |
6d8df534 | 489 | AliExternalTrackParam *track1; |
490 | AliExternalTrackParam *track2; | |
2d57349e | 491 | Double_t distCA; |
6d8df534 | 492 | Double_t x; |
2d57349e | 493 | Double_t alpha, cs, sn; |
494 | Double_t crosspoint[3]; | |
495 | for(Int_t i=0; i<nacc; i++){ | |
6d8df534 | 496 | track1 = (AliExternalTrackParam*)fTrkArraySel.At(i); |
2d57349e | 497 | |
498 | ||
499 | for(Int_t j=i+1; j<nacc; j++){ | |
6d8df534 | 500 | track2 = (AliExternalTrackParam*)fTrkArraySel.At(j); |
2d57349e | 501 | |
f09c879d | 502 | distCA=track2->PropagateToDCA(track1,GetFieldkG()); |
2d57349e | 503 | if(fDCAcut<=0 ||(fDCAcut>0&&distCA<fDCAcut)){ |
6d8df534 | 504 | x=track1->GetX(); |
2d57349e | 505 | alpha=track1->GetAlpha(); |
506 | cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); | |
6d8df534 | 507 | Double_t x1=x*cs - track1->GetY()*sn; |
508 | Double_t y1=x*sn + track1->GetY()*cs; | |
509 | Double_t z1=track1->GetZ(); | |
510 | ||
2d57349e | 511 | Double_t sx1=sn*sn*track1->GetSigmaY2(), sy1=cs*cs*track1->GetSigmaY2(); |
6d8df534 | 512 | x=track2->GetX(); |
2d57349e | 513 | alpha=track2->GetAlpha(); |
514 | cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); | |
6d8df534 | 515 | Double_t x2=x*cs - track2->GetY()*sn; |
516 | Double_t y2=x*sn + track2->GetY()*cs; | |
517 | Double_t z2=track2->GetZ(); | |
2d57349e | 518 | Double_t sx2=sn*sn*track2->GetSigmaY2(), sy2=cs*cs*track2->GetSigmaY2(); |
519 | Double_t sz1=track1->GetSigmaZ2(), sz2=track2->GetSigmaZ2(); | |
520 | Double_t wx1=sx2/(sx1+sx2), wx2=1.- wx1; | |
521 | Double_t wy1=sy2/(sy1+sy2), wy2=1.- wy1; | |
522 | Double_t wz1=sz2/(sz1+sz2), wz2=1.- wz1; | |
523 | crosspoint[0]=wx1*x1 + wx2*x2; | |
524 | crosspoint[1]=wy1*y1 + wy2*y2; | |
525 | crosspoint[2]=wz1*z1 + wz2*z2; | |
526 | ||
527 | ncombi++; | |
528 | for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj]; | |
529 | for(Int_t jj=0;jj<3;jj++)averquad[jj]+=(crosspoint[jj]*crosspoint[jj]); | |
530 | } | |
531 | } | |
532 | ||
533 | } | |
534 | if(ncombi>0){ | |
535 | for(Int_t jj=0;jj<3;jj++){ | |
536 | initPos[jj] = aver[jj]/ncombi; | |
537 | averquad[jj]/=ncombi; | |
538 | sigmaquad[jj]=averquad[jj]-initPos[jj]*initPos[jj]; | |
539 | sigma+=sigmaquad[jj]; | |
540 | } | |
541 | sigma=TMath::Sqrt(TMath::Abs(sigma)); | |
542 | } | |
543 | else { | |
544 | Warning("HelixVertexFinder","Finder did not succed"); | |
545 | sigma=999; | |
546 | } | |
547 | fVert.SetXYZ(initPos); | |
548 | fVert.SetDispersion(sigma); | |
549 | fVert.SetNContributors(ncombi); | |
550 | } | |
50ff0bcd | 551 | //---------------------------------------------------------------------------- |
6d8df534 | 552 | Int_t AliVertexerTracks::PrepareTracks(TObjArray &trkArrayOrig, |
553 | UShort_t *idOrig, | |
554 | Int_t optImpParCut) | |
fee9ef0d | 555 | { |
50ff0bcd | 556 | // |
557 | // Propagate tracks to initial vertex position and store them in a TObjArray | |
558 | // | |
919e537f | 559 | AliDebug(1," PrepareTracks()"); |
6d8df534 | 560 | |
561 | Int_t nTrksOrig = (Int_t)trkArrayOrig.GetEntriesFast(); | |
562 | Int_t nTrksSel = 0; | |
fee9ef0d | 563 | Double_t maxd0rphi; |
50ff0bcd | 564 | Double_t sigmaCurr[3]; |
fee9ef0d | 565 | Double_t normdistx,normdisty; |
6d8df534 | 566 | Double_t d0z0[2],covd0z0[3]; |
43c9dae1 | 567 | Double_t sigmad0; |
50ff0bcd | 568 | |
569 | AliESDVertex *initVertex = new AliESDVertex(fNominalPos,fNominalCov,1,1); | |
570 | ||
6d8df534 | 571 | if(!fTrkArraySel.IsEmpty()) fTrkArraySel.Delete(); |
50ff0bcd | 572 | |
6d8df534 | 573 | AliExternalTrackParam *track=0; |
50ff0bcd | 574 | |
f09c879d | 575 | // loop on tracks |
6d8df534 | 576 | for(Int_t i=0; i<nTrksOrig; i++) { |
2258e165 | 577 | AliExternalTrackParam *trackOrig=(AliExternalTrackParam*)trkArrayOrig.At(i); |
578 | if(trackOrig->Charge()!=0) { // normal tracks | |
579 | track = new AliExternalTrackParam(*(AliExternalTrackParam*)trkArrayOrig.At(i)); | |
580 | } else { // neutral tracks (from a V0) | |
581 | track = new AliNeutralTrackParam(*(AliNeutralTrackParam*)trkArrayOrig.At(i)); | |
582 | } | |
f09c879d | 583 | // tgl cut |
584 | if(TMath::Abs(track->GetTgl())>fMaxTgl) { | |
919e537f | 585 | AliDebug(1,Form(" rejecting track with tgl = %f",track->GetTgl())); |
f09c879d | 586 | delete track; continue; |
6d8df534 | 587 | } |
50ff0bcd | 588 | |
18eba197 | 589 | Bool_t propagateOK = kFALSE; |
50ff0bcd | 590 | // propagate track to vertex |
43c9dae1 | 591 | if(optImpParCut<2 || fOnlyFitter) { // optImpParCut==1 or 0 |
18eba197 | 592 | propagateOK = track->PropagateToDCA(initVertex,GetFieldkG(),100.,d0z0,covd0z0); |
fee9ef0d | 593 | } else { // optImpParCut==2 |
50ff0bcd | 594 | fCurrentVertex->GetSigmaXYZ(sigmaCurr); |
fee9ef0d | 595 | normdistx = TMath::Abs(fCurrentVertex->GetXv()-fNominalPos[0])/TMath::Sqrt(sigmaCurr[0]*sigmaCurr[0]+fNominalCov[0]); |
80d36431 | 596 | normdisty = TMath::Abs(fCurrentVertex->GetYv()-fNominalPos[1])/TMath::Sqrt(sigmaCurr[1]*sigmaCurr[1]+fNominalCov[2]); |
fee9ef0d | 597 | if(normdistx < 3. && normdisty < 3. && |
80d36431 | 598 | (sigmaCurr[0]+sigmaCurr[1])<(TMath::Sqrt(fNominalCov[0])+TMath::Sqrt(fNominalCov[2]))) { |
18eba197 | 599 | propagateOK = track->PropagateToDCA(fCurrentVertex,GetFieldkG(),100.,d0z0,covd0z0); |
50ff0bcd | 600 | } else { |
18eba197 | 601 | propagateOK = track->PropagateToDCA(initVertex,GetFieldkG(),100.,d0z0,covd0z0); |
50ff0bcd | 602 | } |
603 | } | |
604 | ||
18eba197 | 605 | if(!propagateOK) { |
919e537f | 606 | AliDebug(1," rejected"); |
18eba197 | 607 | delete track; continue; |
608 | } | |
609 | ||
43c9dae1 | 610 | sigmad0 = TMath::Sqrt(covd0z0[0]); |
611 | maxd0rphi = fNSigma*sigmad0; | |
fee9ef0d | 612 | if(optImpParCut==1) maxd0rphi *= 5.; |
6b29d399 | 613 | maxd0rphi = TMath::Min(maxd0rphi,fFiducialR); |
43c9dae1 | 614 | //sigmad0z0 = TMath::Sqrt(covd0z0[0]+covd0z0[2]); // for future improvement |
615 | //maxd0z0 = 10.*fNSigma*sigmad0z0; | |
fee9ef0d | 616 | |
919e537f | 617 | 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 | 618 | |
619 | ||
620 | //---- track selection based on impact parameters ----// | |
621 | ||
622 | // always reject tracks outside fiducial volume | |
6b29d399 | 623 | if(TMath::Abs(d0z0[0])>fFiducialR || TMath::Abs(d0z0[1])>fFiducialZ) { |
919e537f | 624 | AliDebug(1," rejected"); |
f09c879d | 625 | delete track; continue; |
626 | } | |
627 | ||
628 | // during iterations 1 and 2 , reject tracks with d0rphi > maxd0rphi | |
629 | if(optImpParCut>0 && TMath::Abs(d0z0[0])>maxd0rphi) { | |
919e537f | 630 | AliDebug(1," rejected"); |
f09c879d | 631 | delete track; continue; |
632 | } | |
fee9ef0d | 633 | |
43c9dae1 | 634 | // if fConstraint=kFALSE, during iterations 1 and 2 || |
635 | // if fConstraint=kTRUE, during iteration 2, | |
f09c879d | 636 | // select tracks with d0oplusz0 < fMaxd0z0 |
43c9dae1 | 637 | if((!fConstraint && optImpParCut>0 && fVert.GetNContributors()>0) || |
638 | ( fConstraint && optImpParCut==2)) { | |
639 | if(nTrksOrig>=3 && | |
f09c879d | 640 | TMath::Sqrt(d0z0[0]*d0z0[0]+d0z0[1]*d0z0[1])>fMaxd0z0) { |
919e537f | 641 | AliDebug(1," rejected"); |
fee9ef0d | 642 | delete track; continue; |
643 | } | |
644 | } | |
43c9dae1 | 645 | |
f09c879d | 646 | // track passed all selections |
6d8df534 | 647 | fTrkArraySel.AddLast(track); |
648 | fIdSel[nTrksSel] = idOrig[i]; | |
649 | nTrksSel++; | |
f09c879d | 650 | } // end loop on tracks |
50ff0bcd | 651 | |
652 | delete initVertex; | |
653 | ||
6d8df534 | 654 | return nTrksSel; |
50ff0bcd | 655 | } |
f09c879d | 656 | //---------------------------------------------------------------------------- |
657 | Bool_t AliVertexerTracks::PropagateTrackTo(AliExternalTrackParam *track, | |
658 | Double_t xToGo) { | |
659 | //---------------------------------------------------------------- | |
660 | // COPIED from AliTracker | |
661 | // | |
662 | // Propagates the track to the plane X=xk (cm). | |
663 | // | |
664 | // Origin: Marian Ivanov, Marian.Ivanov@cern.ch | |
665 | //---------------------------------------------------------------- | |
666 | ||
667 | const Double_t kEpsilon = 0.00001; | |
668 | Double_t xpos = track->GetX(); | |
669 | Double_t dir = (xpos<xToGo) ? 1. : -1.; | |
670 | Double_t maxStep = 5; | |
671 | Double_t maxSnp = 0.8; | |
672 | // | |
673 | while ( (xToGo-xpos)*dir > kEpsilon){ | |
674 | Double_t step = dir*TMath::Min(TMath::Abs(xToGo-xpos), maxStep); | |
675 | Double_t x = xpos+step; | |
676 | Double_t xyz0[3],xyz1[3]; | |
677 | track->GetXYZ(xyz0); //starting global position | |
678 | ||
679 | if(!track->GetXYZAt(x,GetFieldkG(),xyz1)) return kFALSE; // no prolongation | |
680 | xyz1[2]+=kEpsilon; // waiting for bug correction in geo | |
681 | ||
682 | if(TMath::Abs(track->GetSnpAt(x,GetFieldkG())) >= maxSnp) return kFALSE; | |
683 | if(!track->PropagateTo(x,GetFieldkG())) return kFALSE; | |
684 | ||
685 | if(TMath::Abs(track->GetSnp()) >= maxSnp) return kFALSE; | |
686 | track->GetXYZ(xyz0); // global position | |
687 | Double_t alphan = TMath::ATan2(xyz0[1], xyz0[0]); | |
688 | // | |
689 | Double_t ca=TMath::Cos(alphan-track->GetAlpha()), | |
690 | sa=TMath::Sin(alphan-track->GetAlpha()); | |
60e55aee | 691 | Double_t sf=track->GetSnp(), cf=TMath::Sqrt((1.-sf)*(1.+sf)); |
f09c879d | 692 | Double_t sinNew = sf*ca - cf*sa; |
693 | if(TMath::Abs(sinNew) >= maxSnp) return kFALSE; | |
694 | if(!track->Rotate(alphan)) return kFALSE; | |
695 | ||
696 | xpos = track->GetX(); | |
697 | } | |
698 | return kTRUE; | |
699 | } | |
50ff0bcd | 700 | //--------------------------------------------------------------------------- |
fee9ef0d | 701 | AliESDVertex* AliVertexerTracks::RemoveTracksFromVertex(AliESDVertex *inVtx, |
6d8df534 | 702 | TObjArray *trkArray, |
703 | UShort_t *id, | |
fee9ef0d | 704 | Float_t *diamondxy) |
705 | { | |
50ff0bcd | 706 | // |
fee9ef0d | 707 | // Removes tracks in trksTree from fit of inVtx |
50ff0bcd | 708 | // |
fee9ef0d | 709 | |
146c29df | 710 | if(!strstr(inVtx->GetTitle(),"VertexerTracksWithConstraint")) { |
919e537f | 711 | printf("ERROR: primary vertex has no constraint: cannot remove tracks"); |
146c29df | 712 | return 0x0; |
713 | } | |
fee9ef0d | 714 | if(!strstr(inVtx->GetTitle(),"VertexerTracksWithConstraintOnlyFitter")) |
919e537f | 715 | printf("WARNING: result of tracks' removal will be only approximately correct"); |
fee9ef0d | 716 | |
717 | TMatrixD rv(3,1); | |
718 | rv(0,0) = inVtx->GetXv(); | |
719 | rv(1,0) = inVtx->GetYv(); | |
720 | rv(2,0) = inVtx->GetZv(); | |
721 | TMatrixD vV(3,3); | |
722 | Double_t cov[6]; | |
723 | inVtx->GetCovMatrix(cov); | |
724 | vV(0,0) = cov[0]; | |
725 | vV(0,1) = cov[1]; vV(1,0) = cov[1]; | |
726 | vV(1,1) = cov[2]; | |
727 | vV(0,2) = cov[3]; vV(2,0) = cov[3]; | |
728 | vV(1,2) = cov[4]; vV(2,1) = cov[4]; | |
729 | vV(2,2) = cov[5]; | |
730 | ||
731 | TMatrixD sumWi(TMatrixD::kInverted,vV); | |
732 | TMatrixD sumWiri(sumWi,TMatrixD::kMult,rv); | |
733 | ||
dad616ce | 734 | Int_t nUsedTrks = inVtx->GetNIndices(); |
fee9ef0d | 735 | Double_t chi2 = inVtx->GetChi2(); |
736 | ||
6d8df534 | 737 | AliExternalTrackParam *track = 0; |
738 | Int_t ntrks = (Int_t)trkArray->GetEntriesFast(); | |
fee9ef0d | 739 | for(Int_t i=0;i<ntrks;i++) { |
6d8df534 | 740 | track = (AliExternalTrackParam*)trkArray->At(i); |
741 | if(!inVtx->UsesTrack(id[i])) { | |
919e537f | 742 | printf("track %d was not used in vertex fit",id[i]); |
fee9ef0d | 743 | continue; |
744 | } | |
745 | Double_t alpha = track->GetAlpha(); | |
746 | Double_t xl = diamondxy[0]*TMath::Cos(alpha)+diamondxy[1]*TMath::Sin(alpha); | |
6d8df534 | 747 | track->PropagateTo(xl,GetFieldkG()); |
fee9ef0d | 748 | // vector of track global coordinates |
749 | TMatrixD ri(3,1); | |
750 | // covariance matrix of ri | |
751 | TMatrixD wWi(3,3); | |
752 | ||
753 | // get space point from track | |
754 | if(!TrackToPoint(track,ri,wWi)) continue; | |
755 | ||
756 | TMatrixD wWiri(wWi,TMatrixD::kMult,ri); | |
757 | ||
758 | sumWi -= wWi; | |
759 | sumWiri -= wWiri; | |
760 | ||
761 | // track chi2 | |
762 | TMatrixD deltar = rv; deltar -= ri; | |
763 | TMatrixD wWideltar(wWi,TMatrixD::kMult,deltar); | |
764 | Double_t chi2i = deltar(0,0)*wWideltar(0,0)+ | |
765 | deltar(1,0)*wWideltar(1,0)+ | |
766 | deltar(2,0)*wWideltar(2,0); | |
767 | // remove from total chi2 | |
768 | chi2 -= chi2i; | |
769 | ||
770 | nUsedTrks--; | |
771 | if(nUsedTrks<2) { | |
919e537f | 772 | printf("Trying to remove too many tracks!"); |
fee9ef0d | 773 | return 0x0; |
774 | } | |
775 | } | |
776 | ||
777 | TMatrixD rvnew(3,1); | |
778 | TMatrixD vVnew(3,3); | |
779 | ||
780 | // new inverted of weights matrix | |
781 | TMatrixD invsumWi(TMatrixD::kInverted,sumWi); | |
782 | vVnew = invsumWi; | |
783 | // new position of primary vertex | |
784 | rvnew.Mult(vVnew,sumWiri); | |
785 | ||
786 | Double_t position[3]; | |
787 | position[0] = rvnew(0,0); | |
788 | position[1] = rvnew(1,0); | |
789 | position[2] = rvnew(2,0); | |
790 | cov[0] = vVnew(0,0); | |
791 | cov[1] = vVnew(0,1); | |
792 | cov[2] = vVnew(1,1); | |
793 | cov[3] = vVnew(0,2); | |
794 | cov[4] = vVnew(1,2); | |
795 | cov[5] = vVnew(2,2); | |
796 | ||
797 | // store data in the vertex object | |
798 | AliESDVertex *outVtx = new AliESDVertex(position,cov,chi2,nUsedTrks); | |
799 | outVtx->SetTitle(inVtx->GetTitle()); | |
fee9ef0d | 800 | UShort_t *inindices = inVtx->GetIndices(); |
dad616ce | 801 | Int_t nIndices = nUsedTrks; |
4d023a8f | 802 | UShort_t *outindices = new UShort_t[nIndices]; |
fee9ef0d | 803 | Int_t j=0; |
fee9ef0d | 804 | for(Int_t k=0; k<inVtx->GetNIndices(); k++) { |
6d8df534 | 805 | Bool_t copyindex=kTRUE; |
fee9ef0d | 806 | for(Int_t l=0; l<ntrks; l++) { |
6d8df534 | 807 | if(inindices[k]==id[l]) copyindex=kFALSE; |
fee9ef0d | 808 | } |
809 | if(copyindex) { | |
810 | outindices[j] = inindices[k]; j++; | |
811 | } | |
812 | } | |
4d023a8f | 813 | outVtx->SetIndices(nIndices,outindices); |
fee9ef0d | 814 | delete [] outindices; |
815 | ||
919e537f | 816 | /* |
817 | printf("Vertex before removing tracks:"); | |
fee9ef0d | 818 | inVtx->PrintStatus(); |
819 | inVtx->PrintIndices(); | |
919e537f | 820 | printf("Vertex after removing tracks:"); |
fee9ef0d | 821 | outVtx->PrintStatus(); |
822 | outVtx->PrintIndices(); | |
919e537f | 823 | */ |
fee9ef0d | 824 | |
825 | return outVtx; | |
826 | } | |
827 | //--------------------------------------------------------------------------- | |
a00021a7 | 828 | void AliVertexerTracks::SetCuts(Double_t *cuts) |
829 | { | |
830 | // | |
831 | // Cut values | |
832 | // | |
833 | SetDCAcut(cuts[0]); | |
834 | SetDCAcutIter0(cuts[1]); | |
835 | SetMaxd0z0(cuts[2]); | |
5b78b791 | 836 | if(fMode==0 && cuts[3]<0) SetITSrefitNotRequired(); |
837 | SetMinClusters((Int_t)(TMath::Abs(cuts[3]))); | |
a00021a7 | 838 | SetMinTracks((Int_t)(cuts[4])); |
839 | SetNSigmad0(cuts[5]); | |
840 | SetMinDetFitter(cuts[6]); | |
841 | SetMaxTgl(cuts[7]); | |
842 | SetFiducialRZ(cuts[8],cuts[9]); | |
8c75f668 | 843 | fAlgo=(Int_t)(cuts[10]); |
844 | fAlgoIter0=(Int_t)(cuts[11]); | |
a00021a7 | 845 | |
846 | return; | |
847 | } | |
848 | //--------------------------------------------------------------------------- | |
f09c879d | 849 | void AliVertexerTracks::SetITSMode(Double_t dcacut, |
850 | Double_t dcacutIter0, | |
851 | Double_t maxd0z0, | |
6b29d399 | 852 | Int_t minCls, |
f09c879d | 853 | Int_t mintrks, |
854 | Double_t nsigma, | |
855 | Double_t mindetfitter, | |
6b29d399 | 856 | Double_t maxtgl, |
857 | Double_t fidR, | |
8c75f668 | 858 | Double_t fidZ, |
859 | Int_t finderAlgo, | |
860 | Int_t finderAlgoIter0) | |
f09c879d | 861 | { |
862 | // | |
863 | // Cut values for ITS mode | |
864 | // | |
865 | fMode = 0; | |
5b78b791 | 866 | if(minCls>0) { |
867 | SetITSrefitRequired(); | |
868 | } else { | |
869 | SetITSrefitNotRequired(); | |
870 | } | |
f09c879d | 871 | SetDCAcut(dcacut); |
872 | SetDCAcutIter0(dcacutIter0); | |
873 | SetMaxd0z0(maxd0z0); | |
5b78b791 | 874 | SetMinClusters(TMath::Abs(minCls)); |
f09c879d | 875 | SetMinTracks(mintrks); |
876 | SetNSigmad0(nsigma); | |
877 | SetMinDetFitter(mindetfitter); | |
878 | SetMaxTgl(maxtgl); | |
6b29d399 | 879 | SetFiducialRZ(fidR,fidZ); |
8c75f668 | 880 | fAlgo=finderAlgo; |
881 | fAlgoIter0=finderAlgoIter0; | |
f09c879d | 882 | |
883 | return; | |
884 | } | |
885 | //--------------------------------------------------------------------------- | |
886 | void AliVertexerTracks::SetTPCMode(Double_t dcacut, | |
887 | Double_t dcacutIter0, | |
888 | Double_t maxd0z0, | |
6b29d399 | 889 | Int_t minCls, |
f09c879d | 890 | Int_t mintrks, |
891 | Double_t nsigma, | |
892 | Double_t mindetfitter, | |
6b29d399 | 893 | Double_t maxtgl, |
894 | Double_t fidR, | |
8c75f668 | 895 | Double_t fidZ, |
896 | Int_t finderAlgo, | |
897 | Int_t finderAlgoIter0) | |
f09c879d | 898 | { |
899 | // | |
900 | // Cut values for TPC mode | |
901 | // | |
902 | fMode = 1; | |
903 | SetITSrefitNotRequired(); | |
904 | SetDCAcut(dcacut); | |
905 | SetDCAcutIter0(dcacutIter0); | |
906 | SetMaxd0z0(maxd0z0); | |
6b29d399 | 907 | SetMinClusters(minCls); |
f09c879d | 908 | SetMinTracks(mintrks); |
909 | SetNSigmad0(nsigma); | |
910 | SetMinDetFitter(mindetfitter); | |
911 | SetMaxTgl(maxtgl); | |
6b29d399 | 912 | SetFiducialRZ(fidR,fidZ); |
8c75f668 | 913 | fAlgo=finderAlgo; |
914 | fAlgoIter0=finderAlgoIter0; | |
f09c879d | 915 | |
916 | return; | |
917 | } | |
918 | //--------------------------------------------------------------------------- | |
fee9ef0d | 919 | void AliVertexerTracks::SetSkipTracks(Int_t n,Int_t *skipped) |
920 | { | |
921 | // | |
922 | // Mark the tracks not to be used in the vertex reconstruction. | |
923 | // Tracks are identified by AliESDtrack::GetID() | |
924 | // | |
925 | fNTrksToSkip = n; fTrksToSkip = new Int_t[n]; | |
50ff0bcd | 926 | for(Int_t i=0;i<n;i++) fTrksToSkip[i] = skipped[i]; |
927 | return; | |
928 | } | |
929 | //--------------------------------------------------------------------------- | |
fee9ef0d | 930 | void AliVertexerTracks::SetVtxStart(AliESDVertex *vtx) |
931 | { | |
50ff0bcd | 932 | // |
933 | // Set initial vertex knowledge | |
934 | // | |
935 | vtx->GetXYZ(fNominalPos); | |
936 | vtx->GetCovMatrix(fNominalCov); | |
fee9ef0d | 937 | SetConstraintOn(); |
50ff0bcd | 938 | return; |
939 | } | |
2d57349e | 940 | //--------------------------------------------------------------------------- |
fee9ef0d | 941 | void AliVertexerTracks::StrLinVertexFinderMinDist(Int_t optUseWeights) |
dc3719f3 | 942 | { |
6d8df534 | 943 | AliExternalTrackParam *track1; |
6d8df534 | 944 | const Int_t knacc = (Int_t)fTrkArraySel.GetEntriesFast(); |
f54bad66 | 945 | static TClonesArray linarray("AliStrLine",knacc); |
dc3719f3 | 946 | for(Int_t i=0; i<knacc; i++){ |
6d8df534 | 947 | track1 = (AliExternalTrackParam*)fTrkArraySel.At(i); |
dc3719f3 | 948 | Double_t alpha=track1->GetAlpha(); |
949 | Double_t mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; | |
950 | Double_t pos[3],dir[3],sigmasq[3]; | |
f09c879d | 951 | track1->GetXYZAt(mindist,GetFieldkG(),pos); |
952 | track1->GetPxPyPzAt(mindist,GetFieldkG(),dir); | |
dc3719f3 | 953 | sigmasq[0]=TMath::Sin(alpha)*TMath::Sin(alpha)*track1->GetSigmaY2(); |
954 | sigmasq[1]=TMath::Cos(alpha)*TMath::Cos(alpha)*track1->GetSigmaY2(); | |
955 | sigmasq[2]=track1->GetSigmaZ2(); | |
146c29df | 956 | TMatrixD ri(3,1); |
957 | TMatrixD wWi(3,3); | |
8c75f668 | 958 | //if(!TrackToPoint(track1,ri,wWi)) {printf("WARNING\n");continue;} |
959 | if(!TrackToPoint(track1,ri,wWi)) {optUseWeights=kFALSE;printf("WARNING\n");} | |
146c29df | 960 | Double_t wmat[9]; |
961 | Int_t iel=0; | |
962 | for(Int_t ia=0;ia<3;ia++){ | |
963 | for(Int_t ib=0;ib<3;ib++){ | |
964 | wmat[iel]=wWi(ia,ib); | |
965 | iel++; | |
966 | } | |
967 | } | |
8c75f668 | 968 | new(linarray[i]) AliStrLine(pos,sigmasq,wmat,dir); |
dc3719f3 | 969 | } |
f54bad66 | 970 | fVert=TrackletVertexFinder(&linarray,optUseWeights); |
971 | linarray.Clear("C"); | |
dc3719f3 | 972 | } |
973 | //--------------------------------------------------------------------------- | |
146c29df | 974 | AliESDVertex AliVertexerTracks::TrackletVertexFinder(TClonesArray *lines, Int_t optUseWeights) |
fee9ef0d | 975 | { |
2d57349e | 976 | // Calculate the point at minimum distance to prepared tracks |
dc3719f3 | 977 | const Int_t knacc = (Int_t)lines->GetEntriesFast(); |
978 | Double_t initPos[3]={0.,0.,0.}; | |
2d57349e | 979 | |
2d57349e | 980 | Double_t (*vectP0)[3]=new Double_t [knacc][3]; |
981 | Double_t (*vectP1)[3]=new Double_t [knacc][3]; | |
982 | ||
983 | Double_t sum[3][3]; | |
984 | Double_t dsum[3]={0,0,0}; | |
146c29df | 985 | TMatrixD sumWi(3,3); |
986 | for(Int_t i=0;i<3;i++){ | |
987 | for(Int_t j=0;j<3;j++){ | |
988 | sum[i][j]=0; | |
989 | sumWi(i,j)=0.; | |
990 | } | |
991 | } | |
992 | ||
2d57349e | 993 | for(Int_t i=0; i<knacc; i++){ |
f54bad66 | 994 | AliStrLine* line1 = (AliStrLine*)lines->At(i); |
dc3719f3 | 995 | Double_t p0[3],cd[3],sigmasq[3]; |
146c29df | 996 | Double_t wmat[9]; |
8c75f668 | 997 | if(!line1) printf("ERROR %d %d\n",i,knacc); |
2d57349e | 998 | line1->GetP0(p0); |
999 | line1->GetCd(cd); | |
dc3719f3 | 1000 | line1->GetSigma2P0(sigmasq); |
146c29df | 1001 | line1->GetWMatrix(wmat); |
1002 | TMatrixD wWi(3,3); | |
1003 | Int_t iel=0; | |
1004 | for(Int_t ia=0;ia<3;ia++){ | |
1005 | for(Int_t ib=0;ib<3;ib++){ | |
1006 | wWi(ia,ib)=wmat[iel]; | |
1007 | iel++; | |
1008 | } | |
1009 | } | |
1010 | ||
1011 | sumWi+=wWi; | |
1012 | ||
2d57349e | 1013 | Double_t p1[3]={p0[0]+cd[0],p0[1]+cd[1],p0[2]+cd[2]}; |
1014 | vectP0[i][0]=p0[0]; | |
1015 | vectP0[i][1]=p0[1]; | |
1016 | vectP0[i][2]=p0[2]; | |
1017 | vectP1[i][0]=p1[0]; | |
1018 | vectP1[i][1]=p1[1]; | |
1019 | vectP1[i][2]=p1[2]; | |
1020 | ||
1021 | Double_t matr[3][3]; | |
1022 | Double_t dknow[3]; | |
1023 | if(optUseWeights==0)GetStrLinDerivMatrix(p0,p1,matr,dknow); | |
dc3719f3 | 1024 | else GetStrLinDerivMatrix(p0,p1,sigmasq,matr,dknow); |
1025 | ||
2d57349e | 1026 | |
1027 | for(Int_t iii=0;iii<3;iii++){ | |
1028 | dsum[iii]+=dknow[iii]; | |
1029 | for(Int_t lj=0;lj<3;lj++) sum[iii][lj]+=matr[iii][lj]; | |
1030 | } | |
2d57349e | 1031 | } |
146c29df | 1032 | |
1033 | TMatrixD invsumWi(TMatrixD::kInverted,sumWi); | |
1034 | Double_t covmatrix[6]; | |
1035 | covmatrix[0] = invsumWi(0,0); | |
1036 | covmatrix[1] = invsumWi(0,1); | |
1037 | covmatrix[2] = invsumWi(1,1); | |
1038 | covmatrix[3] = invsumWi(0,2); | |
1039 | covmatrix[4] = invsumWi(1,2); | |
1040 | covmatrix[5] = invsumWi(2,2); | |
1041 | ||
2d57349e | 1042 | Double_t vett[3][3]; |
1043 | Double_t det=GetDeterminant3X3(sum); | |
dc3719f3 | 1044 | Double_t sigma=0; |
2d57349e | 1045 | |
fee9ef0d | 1046 | if(det!=0){ |
1047 | for(Int_t zz=0;zz<3;zz++){ | |
1048 | for(Int_t ww=0;ww<3;ww++){ | |
1049 | for(Int_t kk=0;kk<3;kk++) vett[ww][kk]=sum[ww][kk]; | |
1050 | } | |
1051 | for(Int_t kk=0;kk<3;kk++) vett[kk][zz]=dsum[kk]; | |
1052 | initPos[zz]=GetDeterminant3X3(vett)/det; | |
1053 | } | |
1054 | ||
1055 | ||
1056 | for(Int_t i=0; i<knacc; i++){ | |
1057 | Double_t p0[3]={0,0,0},p1[3]={0,0,0}; | |
1058 | for(Int_t ii=0;ii<3;ii++){ | |
1059 | p0[ii]=vectP0[i][ii]; | |
1060 | p1[ii]=vectP1[i][ii]; | |
1061 | } | |
1062 | sigma+=GetStrLinMinDist(p0,p1,initPos); | |
1063 | } | |
1064 | ||
f09c879d | 1065 | if(sigma>0.) {sigma=TMath::Sqrt(sigma);}else{sigma=999;} |
fee9ef0d | 1066 | }else{ |
50ff0bcd | 1067 | sigma=999; |
1068 | } | |
146c29df | 1069 | AliESDVertex theVert(initPos,covmatrix,99999.,knacc); |
1070 | theVert.SetDispersion(sigma); | |
50ff0bcd | 1071 | delete vectP0; |
1072 | delete vectP1; | |
dc3719f3 | 1073 | return theVert; |
50ff0bcd | 1074 | } |
1075 | //--------------------------------------------------------------------------- | |
6d8df534 | 1076 | Bool_t AliVertexerTracks::TrackToPoint(AliExternalTrackParam *t, |
0bf2e2b4 | 1077 | TMatrixD &ri,TMatrixD &wWi, |
1078 | Bool_t uUi3by3) const | |
fee9ef0d | 1079 | { |
1080 | // | |
6d8df534 | 1081 | // Extract from the AliExternalTrackParam the global coordinates ri and covariance matrix |
fee9ef0d | 1082 | // wWi of the space point that it represents (to be used in VertexFitter()) |
1083 | // | |
1084 | ||
1085 | ||
1086 | Double_t rotAngle = t->GetAlpha(); | |
1087 | if(rotAngle<0.) rotAngle += 2.*TMath::Pi(); | |
1088 | Double_t cosRot = TMath::Cos(rotAngle); | |
1089 | Double_t sinRot = TMath::Sin(rotAngle); | |
1090 | ||
1091 | ri(0,0) = t->GetX()*cosRot-t->GetY()*sinRot; | |
1092 | ri(1,0) = t->GetX()*sinRot+t->GetY()*cosRot; | |
1093 | ri(2,0) = t->GetZ(); | |
1094 | ||
0bf2e2b4 | 1095 | |
1096 | ||
1097 | if(!uUi3by3) { | |
1098 | // matrix to go from global (x,y,z) to local (y,z); | |
1099 | TMatrixD qQi(2,3); | |
1100 | qQi(0,0) = -sinRot; | |
1101 | qQi(0,1) = cosRot; | |
1102 | qQi(0,2) = 0.; | |
1103 | qQi(1,0) = 0.; | |
1104 | qQi(1,1) = 0.; | |
1105 | qQi(1,2) = 1.; | |
1106 | ||
1107 | // covariance matrix of local (y,z) - inverted | |
0bf2e2b4 | 1108 | TMatrixD uUi(2,2); |
6d8df534 | 1109 | uUi(0,0) = t->GetSigmaY2(); |
1110 | uUi(0,1) = t->GetSigmaZY(); | |
1111 | uUi(1,0) = t->GetSigmaZY(); | |
1112 | uUi(1,1) = t->GetSigmaZ2(); | |
919e537f | 1113 | //printf(" Ui :"); |
1114 | //printf(" %f %f",uUi(0,0),uUi(0,1)); | |
1115 | //printf(" %f %f",uUi(1,0),uUi(1,1)); | |
0bf2e2b4 | 1116 | |
1117 | if(uUi.Determinant() <= 0.) return kFALSE; | |
1118 | TMatrixD uUiInv(TMatrixD::kInverted,uUi); | |
1119 | ||
1120 | // weights matrix: wWi = qQiT * uUiInv * qQi | |
1121 | TMatrixD uUiInvQi(uUiInv,TMatrixD::kMult,qQi); | |
1122 | TMatrixD m(qQi,TMatrixD::kTransposeMult,uUiInvQi); | |
1123 | wWi = m; | |
1124 | } else { | |
1125 | if(fVert.GetNContributors()<1) AliFatal("Vertex from finder is empty"); | |
1126 | // matrix to go from global (x,y,z) to local (x,y,z); | |
1127 | TMatrixD qQi(3,3); | |
1128 | qQi(0,0) = cosRot; | |
1129 | qQi(0,1) = sinRot; | |
1130 | qQi(0,2) = 0.; | |
1131 | qQi(1,0) = -sinRot; | |
1132 | qQi(1,1) = cosRot; | |
1133 | qQi(1,2) = 0.; | |
1134 | qQi(2,0) = 0.; | |
1135 | qQi(2,1) = 0.; | |
1136 | qQi(2,2) = 1.; | |
1137 | ||
1138 | // covariance of fVert along the track | |
1139 | Double_t p[3],pt,ptot; | |
1140 | t->GetPxPyPz(p); | |
1141 | pt = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]); | |
1142 | ptot = TMath::Sqrt(pt*pt+p[2]*p[2]); | |
3b768a1d | 1143 | Double_t cphi = p[0]/pt; //cos(phi)=px/pt |
1144 | Double_t sphi = p[1]/pt; //sin(phi)=py/pt | |
1145 | Double_t clambda = pt/ptot; //cos(lambda)=pt/ptot | |
1146 | Double_t slambda = p[2]/ptot; //sin(lambda)=pz/ptot | |
0bf2e2b4 | 1147 | Double_t covfVert[6]; |
1148 | fVert.GetCovMatrix(covfVert); | |
1149 | Double_t covfVertalongt = | |
3b768a1d | 1150 | covfVert[0]*cphi*cphi*clambda*clambda |
1151 | +covfVert[1]*2.*cphi*sphi*clambda*clambda | |
1152 | +covfVert[3]*2.*cphi*clambda*slambda | |
1153 | +covfVert[2]*sphi*sphi*clambda*clambda | |
1154 | +covfVert[4]*2.*sphi*clambda*slambda | |
1155 | +covfVert[5]*slambda*slambda; | |
0bf2e2b4 | 1156 | // covariance matrix of local (x,y,z) - inverted |
1157 | TMatrixD uUi(3,3); | |
3b768a1d | 1158 | uUi(0,0) = covfVertalongt * fnSigmaForUi00 * fnSigmaForUi00; |
919e537f | 1159 | AliDebug(1,Form("=====> sqrtUi00 cm %f",TMath::Sqrt(uUi(0,0)))); |
0bf2e2b4 | 1160 | uUi(0,1) = 0.; |
1161 | uUi(0,2) = 0.; | |
1162 | uUi(1,0) = 0.; | |
6d8df534 | 1163 | uUi(1,1) = t->GetSigmaY2(); |
1164 | uUi(1,2) = t->GetSigmaZY(); | |
0bf2e2b4 | 1165 | uUi(2,0) = 0.; |
6d8df534 | 1166 | uUi(2,1) = t->GetSigmaZY(); |
1167 | uUi(2,2) = t->GetSigmaZ2(); | |
0bf2e2b4 | 1168 | //printf(" Ui :\n"); |
1169 | //printf(" %f %f\n",uUi(0,0),uUi(0,1)); | |
1170 | //printf(" %f %f\n",uUi(1,0),uUi(1,1)); | |
fee9ef0d | 1171 | |
0bf2e2b4 | 1172 | if(uUi.Determinant() <= 0.) return kFALSE; |
1173 | TMatrixD uUiInv(TMatrixD::kInverted,uUi); | |
1174 | ||
1175 | // weights matrix: wWi = qQiT * uUiInv * qQi | |
1176 | TMatrixD uUiInvQi(uUiInv,TMatrixD::kMult,qQi); | |
1177 | TMatrixD m(qQi,TMatrixD::kTransposeMult,uUiInvQi); | |
1178 | wWi = m; | |
1179 | } | |
1180 | ||
fee9ef0d | 1181 | |
1182 | return kTRUE; | |
1183 | } | |
1184 | //--------------------------------------------------------------------------- | |
6d8df534 | 1185 | void AliVertexerTracks::TooFewTracks() |
fee9ef0d | 1186 | { |
50ff0bcd | 1187 | // |
6d8df534 | 1188 | // When the number of tracks is < fMinTracks, |
1189 | // deal with vertices not found and prepare to exit | |
50ff0bcd | 1190 | // |
919e537f | 1191 | AliDebug(1,"TooFewTracks"); |
2d57349e | 1192 | |
50ff0bcd | 1193 | Double_t pos[3],err[3]; |
50ff0bcd | 1194 | pos[0] = fNominalPos[0]; |
1195 | err[0] = TMath::Sqrt(fNominalCov[0]); | |
1196 | pos[1] = fNominalPos[1]; | |
1197 | err[1] = TMath::Sqrt(fNominalCov[2]); | |
6d8df534 | 1198 | pos[2] = fNominalPos[2]; |
1199 | err[2] = TMath::Sqrt(fNominalCov[5]); | |
1200 | Int_t ncontr = (err[0]>1. ? -1 : -3); | |
5b78b791 | 1201 | if(fCurrentVertex) { delete fCurrentVertex; fCurrentVertex=0; } |
50ff0bcd | 1202 | fCurrentVertex = new AliESDVertex(pos,err); |
1203 | fCurrentVertex->SetNContributors(ncontr); | |
2d57349e | 1204 | |
fee9ef0d | 1205 | if(fConstraint) { |
1206 | fCurrentVertex->SetTitle("VertexerTracksWithConstraint"); | |
1207 | } else { | |
50ff0bcd | 1208 | fCurrentVertex->SetTitle("VertexerTracksNoConstraint"); |
fee9ef0d | 1209 | } |
2d57349e | 1210 | |
6d8df534 | 1211 | if(!fTrkArraySel.IsEmpty()) fTrkArraySel.Delete(); |
1212 | if(fIdSel) {delete [] fIdSel; fIdSel=NULL;} | |
1213 | if(fTrksToSkip) {delete [] fTrksToSkip; fTrksToSkip=NULL;} | |
1214 | ||
50ff0bcd | 1215 | return; |
1216 | } | |
1217 | //--------------------------------------------------------------------------- | |
fee9ef0d | 1218 | void AliVertexerTracks::VertexFinder(Int_t optUseWeights) |
1219 | { | |
2d57349e | 1220 | |
50ff0bcd | 1221 | // Get estimate of vertex position in (x,y) from tracks DCA |
1222 | ||
1223 | Double_t initPos[3]; | |
1224 | initPos[2] = 0.; | |
1225 | for(Int_t i=0;i<2;i++)initPos[i]=fNominalPos[i]; | |
6d8df534 | 1226 | Int_t nacc = (Int_t)fTrkArraySel.GetEntriesFast(); |
50ff0bcd | 1227 | Double_t aver[3]={0.,0.,0.}; |
1228 | Double_t aversq[3]={0.,0.,0.}; | |
1229 | Double_t sigmasq[3]={0.,0.,0.}; | |
1230 | Double_t sigma=0; | |
1231 | Int_t ncombi = 0; | |
6d8df534 | 1232 | AliExternalTrackParam *track1; |
1233 | AliExternalTrackParam *track2; | |
50ff0bcd | 1234 | Double_t pos[3],dir[3]; |
1235 | Double_t alpha,mindist; | |
2d57349e | 1236 | |
50ff0bcd | 1237 | for(Int_t i=0; i<nacc; i++){ |
6d8df534 | 1238 | track1 = (AliExternalTrackParam*)fTrkArraySel.At(i); |
50ff0bcd | 1239 | alpha=track1->GetAlpha(); |
1240 | mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; | |
f09c879d | 1241 | track1->GetXYZAt(mindist,GetFieldkG(),pos); |
1242 | track1->GetPxPyPzAt(mindist,GetFieldkG(),dir); | |
50ff0bcd | 1243 | AliStrLine *line1 = new AliStrLine(pos,dir); |
2d57349e | 1244 | |
50ff0bcd | 1245 | // AliStrLine *line1 = new AliStrLine(); |
f09c879d | 1246 | // track1->ApproximateHelixWithLine(mindist,GetFieldkG(),line1); |
50ff0bcd | 1247 | |
1248 | for(Int_t j=i+1; j<nacc; j++){ | |
6d8df534 | 1249 | track2 = (AliExternalTrackParam*)fTrkArraySel.At(j); |
50ff0bcd | 1250 | alpha=track2->GetAlpha(); |
1251 | mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; | |
f09c879d | 1252 | track2->GetXYZAt(mindist,GetFieldkG(),pos); |
1253 | track2->GetPxPyPzAt(mindist,GetFieldkG(),dir); | |
50ff0bcd | 1254 | AliStrLine *line2 = new AliStrLine(pos,dir); |
1255 | // AliStrLine *line2 = new AliStrLine(); | |
f09c879d | 1256 | // track2->ApproximateHelixWithLine(mindist,GetFieldkG(),line2); |
50ff0bcd | 1257 | Double_t distCA=line2->GetDCA(line1); |
fee9ef0d | 1258 | //printf("%d %d %f\n",i,j,distCA); |
1259 | if(fDCAcut<=0 || (fDCAcut>0&&distCA<fDCAcut)){ | |
50ff0bcd | 1260 | Double_t pnt1[3],pnt2[3],crosspoint[3]; |
2d57349e | 1261 | |
50ff0bcd | 1262 | if(optUseWeights<=0){ |
1263 | Int_t retcode = line2->Cross(line1,crosspoint); | |
1264 | if(retcode>=0){ | |
1265 | ncombi++; | |
1266 | for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj]; | |
1267 | for(Int_t jj=0;jj<3;jj++)aversq[jj]+=(crosspoint[jj]*crosspoint[jj]); | |
1268 | } | |
1269 | } | |
1270 | if(optUseWeights>0){ | |
1271 | Int_t retcode = line1->CrossPoints(line2,pnt1,pnt2); | |
1272 | if(retcode>=0){ | |
5c03260f | 1273 | Double_t cs, sn; |
50ff0bcd | 1274 | alpha=track1->GetAlpha(); |
1275 | cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); | |
1276 | Double_t sx1=sn*sn*track1->GetSigmaY2(), sy1=cs*cs*track1->GetSigmaY2(); | |
1277 | alpha=track2->GetAlpha(); | |
1278 | cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); | |
1279 | Double_t sx2=sn*sn*track2->GetSigmaY2(), sy2=cs*cs*track2->GetSigmaY2(); | |
1280 | Double_t sz1=track1->GetSigmaZ2(), sz2=track2->GetSigmaZ2(); | |
1281 | Double_t wx1=sx2/(sx1+sx2), wx2=1.- wx1; | |
1282 | Double_t wy1=sy2/(sy1+sy2), wy2=1.- wy1; | |
1283 | Double_t wz1=sz2/(sz1+sz2), wz2=1.- wz1; | |
1284 | crosspoint[0]=wx1*pnt1[0] + wx2*pnt2[0]; | |
1285 | crosspoint[1]=wy1*pnt1[1] + wy2*pnt2[1]; | |
1286 | crosspoint[2]=wz1*pnt1[2] + wz2*pnt2[2]; | |
1287 | ||
1288 | ncombi++; | |
1289 | for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj]; | |
1290 | for(Int_t jj=0;jj<3;jj++)aversq[jj]+=(crosspoint[jj]*crosspoint[jj]); | |
1291 | } | |
1292 | } | |
1293 | } | |
1294 | delete line2; | |
1295 | } | |
1296 | delete line1; | |
71d84967 | 1297 | } |
50ff0bcd | 1298 | if(ncombi>0){ |
1299 | for(Int_t jj=0;jj<3;jj++){ | |
1300 | initPos[jj] = aver[jj]/ncombi; | |
fee9ef0d | 1301 | //printf("%f\n",initPos[jj]); |
50ff0bcd | 1302 | aversq[jj]/=ncombi; |
1303 | sigmasq[jj]=aversq[jj]-initPos[jj]*initPos[jj]; | |
1304 | sigma+=sigmasq[jj]; | |
1305 | } | |
1306 | sigma=TMath::Sqrt(TMath::Abs(sigma)); | |
1307 | } | |
1308 | else { | |
1309 | Warning("VertexFinder","Finder did not succed"); | |
1310 | sigma=999; | |
1311 | } | |
1312 | fVert.SetXYZ(initPos); | |
1313 | fVert.SetDispersion(sigma); | |
1314 | fVert.SetNContributors(ncombi); | |
2d57349e | 1315 | } |
ec1be5d5 | 1316 | //--------------------------------------------------------------------------- |
6d8df534 | 1317 | void AliVertexerTracks::VertexFitter() |
fee9ef0d | 1318 | { |
ec1be5d5 | 1319 | // |
1320 | // The optimal estimate of the vertex position is given by a "weighted | |
0bf2e2b4 | 1321 | // average of tracks positions". |
fee9ef0d | 1322 | // Original method: V. Karimaki, CMS Note 97/0051 |
ec1be5d5 | 1323 | // |
6d8df534 | 1324 | Bool_t useConstraint = fConstraint; |
ec1be5d5 | 1325 | Double_t initPos[3]; |
0bf2e2b4 | 1326 | if(!fOnlyFitter) { |
1327 | fVert.GetXYZ(initPos); | |
1328 | } else { | |
1329 | initPos[0]=fNominalPos[0]; | |
1330 | initPos[1]=fNominalPos[1]; | |
1331 | initPos[2]=fNominalPos[2]; | |
1332 | } | |
1333 | ||
6d8df534 | 1334 | Int_t nTrksSel = (Int_t)fTrkArraySel.GetEntries(); |
1335 | if(nTrksSel==1) useConstraint=kTRUE; | |
919e537f | 1336 | AliDebug(1,"--- VertexFitter(): start"); |
1337 | AliDebug(1,Form(" Number of tracks in array: %d\n",nTrksSel)); | |
1338 | AliDebug(1,Form(" Minimum # tracks required in fit: %d\n",fMinTracks)); | |
1339 | AliDebug(1,Form(" Vertex position after finder: %f,%f,%f\n",initPos[0],initPos[1],initPos[2])); | |
1340 | 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 | 1341 | |
0bf2e2b4 | 1342 | // special treatment for few-tracks fits (e.g. secondary vertices) |
6d8df534 | 1343 | Bool_t uUi3by3 = kFALSE; if(nTrksSel<5 && !useConstraint) uUi3by3 = kTRUE; |
0bf2e2b4 | 1344 | |
ec1be5d5 | 1345 | Int_t i,j,k,step=0; |
1346 | TMatrixD rv(3,1); | |
1347 | TMatrixD vV(3,3); | |
1348 | rv(0,0) = initPos[0]; | |
1349 | rv(1,0) = initPos[1]; | |
1350 | rv(2,0) = 0.; | |
1351 | Double_t xlStart,alpha; | |
6d8df534 | 1352 | Int_t nTrksUsed; |
fee9ef0d | 1353 | Double_t chi2,chi2i,chi2b; |
6d8df534 | 1354 | AliExternalTrackParam *t = 0; |
ec1be5d5 | 1355 | Int_t failed = 0; |
1356 | ||
50ff0bcd | 1357 | // initial vertex covariance matrix |
1358 | TMatrixD vVb(3,3); | |
1359 | vVb(0,0) = fNominalCov[0]; | |
1360 | vVb(0,1) = fNominalCov[1]; | |
1361 | vVb(0,2) = 0.; | |
1362 | vVb(1,0) = fNominalCov[1]; | |
1363 | vVb(1,1) = fNominalCov[2]; | |
1364 | vVb(1,2) = 0.; | |
1365 | vVb(2,0) = 0.; | |
1366 | vVb(2,1) = 0.; | |
1367 | vVb(2,2) = fNominalCov[5]; | |
1368 | TMatrixD vVbInv(TMatrixD::kInverted,vVb); | |
1369 | TMatrixD rb(3,1); | |
1370 | rb(0,0) = fNominalPos[0]; | |
1371 | rb(1,0) = fNominalPos[1]; | |
1372 | rb(2,0) = fNominalPos[2]; | |
1373 | TMatrixD vVbInvrb(vVbInv,TMatrixD::kMult,rb); | |
1374 | ||
1375 | ||
eae1677e | 1376 | // 2 steps: |
1377 | // 1st - estimate of vtx using all tracks | |
1378 | // 2nd - estimate of global chi2 | |
1379 | for(step=0; step<2; step++) { | |
919e537f | 1380 | AliDebug(1,Form(" step = %d\n",step)); |
ec1be5d5 | 1381 | chi2 = 0.; |
6d8df534 | 1382 | nTrksUsed = 0; |
ec1be5d5 | 1383 | |
0bf2e2b4 | 1384 | if(step==1) { initPos[0]=rv(0,0); initPos[0]=rv(1,0); } |
1385 | ||
ec1be5d5 | 1386 | TMatrixD sumWiri(3,1); |
1387 | TMatrixD sumWi(3,3); | |
1388 | for(i=0; i<3; i++) { | |
1389 | sumWiri(i,0) = 0.; | |
1390 | for(j=0; j<3; j++) sumWi(j,i) = 0.; | |
1391 | } | |
1392 | ||
fee9ef0d | 1393 | // mean vertex constraint |
1394 | if(useConstraint) { | |
50ff0bcd | 1395 | for(i=0;i<3;i++) { |
1396 | sumWiri(i,0) += vVbInvrb(i,0); | |
1397 | for(k=0;k<3;k++) sumWi(i,k) += vVbInv(i,k); | |
07680cae | 1398 | } |
fee9ef0d | 1399 | // chi2 |
1400 | TMatrixD deltar = rv; deltar -= rb; | |
1401 | TMatrixD vVbInvdeltar(vVbInv,TMatrixD::kMult,deltar); | |
1402 | chi2b = deltar(0,0)*vVbInvdeltar(0,0)+ | |
1403 | deltar(1,0)*vVbInvdeltar(1,0)+ | |
1404 | deltar(2,0)*vVbInvdeltar(2,0); | |
1405 | chi2 += chi2b; | |
07680cae | 1406 | } |
1407 | ||
ec1be5d5 | 1408 | // loop on tracks |
6d8df534 | 1409 | for(k=0; k<nTrksSel; k++) { |
ec1be5d5 | 1410 | // get track from track array |
6d8df534 | 1411 | t = (AliExternalTrackParam*)fTrkArraySel.At(k); |
ec1be5d5 | 1412 | alpha = t->GetAlpha(); |
1413 | xlStart = initPos[0]*TMath::Cos(alpha)+initPos[1]*TMath::Sin(alpha); | |
fee9ef0d | 1414 | // to vtxSeed (from finder) |
6d8df534 | 1415 | t->PropagateTo(xlStart,GetFieldkG()); |
fee9ef0d | 1416 | |
ec1be5d5 | 1417 | // vector of track global coordinates |
1418 | TMatrixD ri(3,1); | |
fee9ef0d | 1419 | // covariance matrix of ri |
1420 | TMatrixD wWi(3,3); | |
1421 | ||
1422 | // get space point from track | |
0bf2e2b4 | 1423 | if(!TrackToPoint(t,ri,wWi,uUi3by3)) continue; |
fee9ef0d | 1424 | TMatrixD wWiri(wWi,TMatrixD::kMult,ri); |
ec1be5d5 | 1425 | |
1426 | // track chi2 | |
1427 | TMatrixD deltar = rv; deltar -= ri; | |
1428 | TMatrixD wWideltar(wWi,TMatrixD::kMult,deltar); | |
1429 | chi2i = deltar(0,0)*wWideltar(0,0)+ | |
1430 | deltar(1,0)*wWideltar(1,0)+ | |
1431 | deltar(2,0)*wWideltar(2,0); | |
1432 | ||
ec1be5d5 | 1433 | // add to total chi2 |
1434 | chi2 += chi2i; | |
1435 | ||
ec1be5d5 | 1436 | sumWiri += wWiri; |
1437 | sumWi += wWi; | |
1438 | ||
6d8df534 | 1439 | nTrksUsed++; |
ec1be5d5 | 1440 | } // end loop on tracks |
1441 | ||
6d8df534 | 1442 | if(nTrksUsed < fMinTracks) { |
ec1be5d5 | 1443 | failed=1; |
1444 | continue; | |
1445 | } | |
1446 | ||
1447 | Double_t determinant = sumWi.Determinant(); | |
f09c879d | 1448 | if(determinant < fMinDetFitter) { |
919e537f | 1449 | AliDebug(1,Form("det(V) = %f (<%f)\n",determinant,fMinDetFitter)); |
ec1be5d5 | 1450 | failed=1; |
1451 | continue; | |
1452 | } | |
1453 | ||
0bf2e2b4 | 1454 | if(step==0) { |
1455 | // inverted of weights matrix | |
1456 | TMatrixD invsumWi(TMatrixD::kInverted,sumWi); | |
1457 | vV = invsumWi; | |
1458 | // position of primary vertex | |
1459 | rv.Mult(vV,sumWiri); | |
1460 | } | |
eae1677e | 1461 | } // end loop on the 2 steps |
ec1be5d5 | 1462 | |
ec1be5d5 | 1463 | if(failed) { |
6d8df534 | 1464 | TooFewTracks(); |
ec1be5d5 | 1465 | return; |
1466 | } | |
1467 | ||
1468 | Double_t position[3]; | |
1469 | position[0] = rv(0,0); | |
1470 | position[1] = rv(1,0); | |
1471 | position[2] = rv(2,0); | |
1472 | Double_t covmatrix[6]; | |
1473 | covmatrix[0] = vV(0,0); | |
1474 | covmatrix[1] = vV(0,1); | |
1475 | covmatrix[2] = vV(1,1); | |
1476 | covmatrix[3] = vV(0,2); | |
1477 | covmatrix[4] = vV(1,2); | |
1478 | covmatrix[5] = vV(2,2); | |
1479 | ||
dc3719f3 | 1480 | // for correct chi2/ndf, count constraint as additional "track" |
6d8df534 | 1481 | if(fConstraint) nTrksUsed++; |
ec1be5d5 | 1482 | // store data in the vertex object |
5b78b791 | 1483 | if(fCurrentVertex) { delete fCurrentVertex; fCurrentVertex=0; } |
6d8df534 | 1484 | fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nTrksUsed); |
ec1be5d5 | 1485 | |
919e537f | 1486 | AliDebug(1," Vertex after fit:"); |
1487 | AliDebug(1,Form("xyz: %f %f %f; nc %d",fCurrentVertex->GetXv(),fCurrentVertex->GetYv(),fCurrentVertex->GetZv(),fCurrentVertex->GetNContributors())); | |
1488 | AliDebug(1,"--- VertexFitter(): finish\n"); | |
1489 | ||
ec1be5d5 | 1490 | |
1491 | return; | |
1492 | } | |
50ff0bcd | 1493 | //---------------------------------------------------------------------------- |
6d8df534 | 1494 | AliESDVertex* AliVertexerTracks::VertexForSelectedTracks(TObjArray *trkArray, |
1495 | UShort_t *id, | |
1496 | Bool_t optUseFitter, | |
1497 | Bool_t optPropagate) | |
fee9ef0d | 1498 | { |
eae1677e | 1499 | // |
6d8df534 | 1500 | // Return vertex from tracks (AliExternalTrackParam) in array |
eae1677e | 1501 | // |
5b78b791 | 1502 | fCurrentVertex = 0; |
fee9ef0d | 1503 | SetConstraintOff(); |
1504 | ||
50ff0bcd | 1505 | // get tracks and propagate them to initial vertex position |
6d8df534 | 1506 | fIdSel = new UShort_t[(Int_t)trkArray->GetEntriesFast()]; |
1507 | Int_t nTrksSel = PrepareTracks(*trkArray,id,0); | |
1508 | if(nTrksSel < TMath::Max(2,fMinTracks)) { | |
1509 | TooFewTracks(); | |
fee9ef0d | 1510 | return fCurrentVertex; |
50ff0bcd | 1511 | } |
1512 | ||
6d8df534 | 1513 | // vertex finder |
fee9ef0d | 1514 | switch (fAlgo) { |
1515 | case 1: StrLinVertexFinderMinDist(1); break; | |
1516 | case 2: StrLinVertexFinderMinDist(0); break; | |
1517 | case 3: HelixVertexFinder(); break; | |
1518 | case 4: VertexFinder(1); break; | |
1519 | case 5: VertexFinder(0); break; | |
1520 | default: printf("Wrong algorithm\n"); break; | |
1521 | } | |
919e537f | 1522 | AliDebug(1," Vertex finding completed\n"); |
fee9ef0d | 1523 | |
1524 | // vertex fitter | |
6d8df534 | 1525 | if(optUseFitter) { |
1526 | VertexFitter(); | |
1527 | } else { | |
fee9ef0d | 1528 | Double_t position[3]={fVert.GetXv(),fVert.GetYv(),fVert.GetZv()}; |
146c29df | 1529 | Double_t covmatrix[6]; |
1530 | fVert.GetCovMatrix(covmatrix); | |
fee9ef0d | 1531 | Double_t chi2=99999.; |
6d8df534 | 1532 | Int_t nTrksUsed=fVert.GetNContributors(); |
1533 | fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nTrksUsed); | |
fee9ef0d | 1534 | } |
1535 | fCurrentVertex->SetDispersion(fVert.GetDispersion()); | |
1536 | ||
1537 | ||
1538 | // set indices of used tracks and propagate track to found vertex | |
50ff0bcd | 1539 | UShort_t *indices = 0; |
6d8df534 | 1540 | Double_t d0z0[2],covd0z0[3]; |
1541 | AliExternalTrackParam *t = 0; | |
fee9ef0d | 1542 | if(fCurrentVertex->GetNContributors()>0) { |
1543 | indices = new UShort_t[fCurrentVertex->GetNContributors()]; | |
6d8df534 | 1544 | for(Int_t jj=0; jj<(Int_t)fTrkArraySel.GetEntriesFast(); jj++) { |
1545 | indices[jj] = fIdSel[jj]; | |
1546 | t = (AliExternalTrackParam*)fTrkArraySel.At(jj); | |
1547 | if(optPropagate && optUseFitter) { | |
fee9ef0d | 1548 | if(TMath::Sqrt(fCurrentVertex->GetXv()*fCurrentVertex->GetXv()+fCurrentVertex->GetYv()*fCurrentVertex->GetYv())<3.) { |
6d8df534 | 1549 | t->PropagateToDCA(fCurrentVertex,GetFieldkG(),100.,d0z0,covd0z0); |
919e537f | 1550 | AliDebug(1,Form("Track %d propagated to found vertex",jj)); |
6d8df534 | 1551 | } else { |
fee9ef0d | 1552 | AliWarning("Found vertex outside beam pipe!"); |
1553 | } | |
1554 | } | |
50ff0bcd | 1555 | } |
fee9ef0d | 1556 | fCurrentVertex->SetIndices(fCurrentVertex->GetNContributors(),indices); |
50ff0bcd | 1557 | } |
6d8df534 | 1558 | |
1559 | // clean up | |
1560 | delete [] indices; indices=NULL; | |
1561 | delete [] fIdSel; fIdSel=NULL; | |
1562 | fTrkArraySel.Delete(); | |
50ff0bcd | 1563 | |
fee9ef0d | 1564 | return fCurrentVertex; |
eae1677e | 1565 | } |
50ff0bcd | 1566 | //---------------------------------------------------------------------------- |
6d8df534 | 1567 | AliESDVertex* AliVertexerTracks::VertexForSelectedESDTracks(TObjArray *trkArray, |
1568 | Bool_t optUseFitter, | |
1569 | Bool_t optPropagate) | |
fee9ef0d | 1570 | { |
50ff0bcd | 1571 | // |
6d8df534 | 1572 | // Return vertex from array of ESD tracks |
50ff0bcd | 1573 | // |
5834e9a1 | 1574 | |
6d8df534 | 1575 | Int_t nTrks = (Int_t)trkArray->GetEntriesFast(); |
1576 | UShort_t *id = new UShort_t[nTrks]; | |
1577 | ||
1578 | AliESDtrack *esdt = 0; | |
50ff0bcd | 1579 | for(Int_t i=0; i<nTrks; i++){ |
6d8df534 | 1580 | esdt = (AliESDtrack*)trkArray->At(i); |
1581 | id[i] = (UShort_t)esdt->GetID(); | |
50ff0bcd | 1582 | } |
1583 | ||
6d8df534 | 1584 | VertexForSelectedTracks(trkArray,id,optUseFitter,optPropagate); |
1585 | ||
1586 | delete [] id; id=NULL; | |
1587 | ||
1588 | return fCurrentVertex; | |
50ff0bcd | 1589 | } |
1590 | //-------------------------------------------------------------------------- |