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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 ----- |
35 | #include "AliStrLine.h" | |
6d8df534 | 36 | #include "AliExternalTrackParam.h" |
af885e0f | 37 | #include "AliESDEvent.h" |
2d57349e | 38 | #include "AliESDtrack.h" |
6d8df534 | 39 | #include "AliVertexerTracks.h" |
2d57349e | 40 | |
41 | ClassImp(AliVertexerTracks) | |
42 | ||
43 | ||
44 | //---------------------------------------------------------------------------- | |
45 | AliVertexerTracks::AliVertexerTracks(): | |
07680cae | 46 | TObject(), |
47 | fVert(), | |
48 | fCurrentVertex(0), | |
dc3719f3 | 49 | fFieldkG(-999.), |
fee9ef0d | 50 | fConstraint(kFALSE), |
51 | fOnlyFitter(kFALSE), | |
0c69be49 | 52 | fMinTracks(1), |
fe12e09c | 53 | fMinITSClusters(5), |
6d8df534 | 54 | fTrkArraySel(), |
55 | fIdSel(0), | |
07680cae | 56 | fTrksToSkip(0), |
57 | fNTrksToSkip(0), | |
58 | fDCAcut(0), | |
59 | fAlgo(1), | |
fe12e09c | 60 | fNSigma(3), |
fee9ef0d | 61 | fMaxd0z0(0.5), |
50ff0bcd | 62 | fITSrefit(kTRUE), |
3b768a1d | 63 | fnSigmaForUi00(1.5), |
07680cae | 64 | fDebug(0) |
2d57349e | 65 | { |
66 | // | |
67 | // Default constructor | |
68 | // | |
3b768a1d | 69 | SetVtxStart(); |
07680cae | 70 | SetVtxStartSigma(); |
2d57349e | 71 | SetMinTracks(); |
07680cae | 72 | SetMinITSClusters(); |
73 | SetNSigmad0(); | |
fee9ef0d | 74 | SetMaxd0z0(); |
2d57349e | 75 | } |
dc3719f3 | 76 | //---------------------------------------------------------------------------- |
77 | AliVertexerTracks::AliVertexerTracks(Double_t fieldkG): | |
07680cae | 78 | TObject(), |
79 | fVert(), | |
80 | fCurrentVertex(0), | |
dc3719f3 | 81 | fFieldkG(-999.), |
fee9ef0d | 82 | fConstraint(kFALSE), |
83 | fOnlyFitter(kFALSE), | |
0c69be49 | 84 | fMinTracks(1), |
fe12e09c | 85 | fMinITSClusters(5), |
6d8df534 | 86 | fTrkArraySel(), |
87 | fIdSel(0), | |
07680cae | 88 | fTrksToSkip(0), |
89 | fNTrksToSkip(0), | |
90 | fDCAcut(0), | |
91 | fAlgo(1), | |
fe12e09c | 92 | fNSigma(3), |
fee9ef0d | 93 | fMaxd0z0(0.5), |
50ff0bcd | 94 | fITSrefit(kTRUE), |
3b768a1d | 95 | fnSigmaForUi00(1.5), |
07680cae | 96 | fDebug(0) |
2d57349e | 97 | { |
98 | // | |
99 | // Standard constructor | |
100 | // | |
3b768a1d | 101 | SetVtxStart(); |
07680cae | 102 | SetVtxStartSigma(); |
2d57349e | 103 | SetMinTracks(); |
07680cae | 104 | SetMinITSClusters(); |
105 | SetNSigmad0(); | |
dc3719f3 | 106 | SetMaxd0z0(); |
107 | SetFieldkG(fieldkG); | |
2d57349e | 108 | } |
109 | //----------------------------------------------------------------------------- | |
fee9ef0d | 110 | AliVertexerTracks::~AliVertexerTracks() |
111 | { | |
2d57349e | 112 | // Default Destructor |
eae1677e | 113 | // The objects pointed by the following pointer are not owned |
2d57349e | 114 | // by this class and are not deleted |
ec1be5d5 | 115 | fCurrentVertex = 0; |
146c29df | 116 | if(fTrksToSkip) { delete [] fTrksToSkip; fTrksToSkip=NULL; } |
6d8df534 | 117 | if(fIdSel) { delete [] fIdSel; fIdSel=NULL; } |
ec1be5d5 | 118 | } |
c5e3e5d1 | 119 | //---------------------------------------------------------------------------- |
af885e0f | 120 | AliESDVertex* AliVertexerTracks::FindPrimaryVertex(const AliESDEvent *esdEvent) |
ec1be5d5 | 121 | { |
c5e3e5d1 | 122 | // |
ec1be5d5 | 123 | // Primary vertex for current ESD event |
eae1677e | 124 | // (Two iterations: |
fee9ef0d | 125 | // 1st with 5*fNSigma*sigma cut w.r.t. to initial vertex |
126 | // + cut on sqrt(d0d0+z0z0) if fConstraint=kFALSE | |
127 | // 2nd with fNSigma*sigma cut w.r.t. to vertex found in 1st iteration) | |
07680cae | 128 | // |
129 | fCurrentVertex = 0; | |
130 | ||
dc3719f3 | 131 | // accept 1-track case only if constraint is available |
132 | if(!fConstraint && fMinTracks==1) fMinTracks=2; | |
133 | ||
fee9ef0d | 134 | // read tracks from ESD |
6d8df534 | 135 | Int_t nTrks = (Int_t)esdEvent->GetNumberOfTracks(); |
136 | if(nTrks<1) { | |
137 | TooFewTracks(); | |
80d36431 | 138 | return fCurrentVertex; |
139 | } | |
6d8df534 | 140 | // |
713e5fbf | 141 | |
a7ede274 | 142 | TDirectory * olddir = gDirectory; |
143 | TFile f("VertexerTracks.root","recreate"); | |
6d8df534 | 144 | TObjArray trkArrayOrig(nTrks); |
145 | UShort_t *idOrig = new UShort_t[nTrks]; | |
07680cae | 146 | |
6d8df534 | 147 | Int_t nTrksOrig=0; |
148 | for(Int_t i=0; i<nTrks; i++) { | |
149 | AliESDtrack *esdt = esdEvent->GetTrack(i); | |
eae1677e | 150 | // check tracks to skip |
6d8df534 | 151 | Bool_t skipThis = kFALSE; |
eae1677e | 152 | for(Int_t j=0; j<fNTrksToSkip; j++) { |
6d8df534 | 153 | if(esdt->GetID()==fTrksToSkip[j]) { |
eae1677e | 154 | if(fDebug) printf("skipping track: %d\n",i); |
155 | skipThis = kTRUE; | |
156 | } | |
157 | } | |
a7ede274 | 158 | if(skipThis) continue; |
6d8df534 | 159 | if(fITSrefit) { |
160 | if(!(esdt->GetStatus()&AliESDtrack::kITSrefit)) continue; | |
161 | // check number of clusters in ITS | |
162 | if(esdt->GetNcls(0)<fMinITSClusters) continue; | |
50ff0bcd | 163 | } |
6d8df534 | 164 | Double_t x,p[5],cov[15]; |
165 | esdt->GetExternalParameters(x,p); | |
166 | esdt->GetExternalCovariance(cov); | |
167 | AliExternalTrackParam *t = new AliExternalTrackParam(x,esdt->GetAlpha(),p,cov); | |
168 | trkArrayOrig.AddLast(t); | |
169 | idOrig[nTrksOrig]=(UShort_t)esdt->GetID(); | |
170 | nTrksOrig++; | |
07680cae | 171 | } |
fee9ef0d | 172 | |
6d8df534 | 173 | FindPrimaryVertex(&trkArrayOrig,idOrig); |
174 | ||
175 | trkArrayOrig.Delete(); | |
176 | delete [] idOrig; idOrig=NULL; | |
177 | f.Close(); | |
178 | gSystem->Unlink("VertexerTracks.root"); | |
179 | olddir->cd(); | |
180 | ||
181 | return fCurrentVertex; | |
182 | } | |
183 | //---------------------------------------------------------------------------- | |
184 | AliESDVertex* AliVertexerTracks::FindPrimaryVertex(TObjArray *trkArrayOrig, | |
185 | UShort_t *idOrig) | |
186 | { | |
187 | // | |
188 | // Primary vertex using the AliExternalTrackParam's in the TObjArray. | |
189 | // idOrig must contain the track IDs from AliESDtrack::GetID() | |
190 | // (Two iterations: | |
191 | // 1st with 5*fNSigma*sigma cut w.r.t. to initial vertex | |
192 | // + cut on sqrt(d0d0+z0z0) if fConstraint=kFALSE | |
193 | // 2nd with fNSigma*sigma cut w.r.t. to vertex found in 1st iteration) | |
194 | // | |
195 | fCurrentVertex = 0; | |
196 | ||
197 | // accept 1-track case only if constraint is available | |
198 | if(!fConstraint && fMinTracks==1) fMinTracks=2; | |
199 | ||
200 | // read tracks from ESD | |
201 | Int_t nTrksOrig = (Int_t)trkArrayOrig->GetEntriesFast(); | |
202 | if(nTrksOrig<=0) { | |
203 | if(fDebug) printf("TooFewTracks\n"); | |
204 | TooFewTracks(); | |
205 | return fCurrentVertex; | |
206 | } | |
207 | ||
fee9ef0d | 208 | // If fConstraint=kFALSE |
209 | // run VertexFinder(1) to get rough estimate of initVertex (x,y) | |
210 | if(!fConstraint) { | |
6d8df534 | 211 | // fill fTrkArraySel, for VertexFinder() |
212 | fIdSel = new UShort_t[nTrksOrig]; | |
213 | PrepareTracks(*trkArrayOrig,idOrig,0); | |
214 | if(fIdSel) { delete [] fIdSel; fIdSel=NULL; } | |
215 | Double_t cutsave = fDCAcut; | |
216 | fDCAcut = (fITSrefit ? 0.1 : 0.5); | |
fee9ef0d | 217 | VertexFinder(1); // using weights, cutting dca < fDCAcut |
218 | fDCAcut = cutsave; | |
fee9ef0d | 219 | if(fVert.GetNContributors()>0) { |
220 | fVert.GetXYZ(fNominalPos); | |
221 | fNominalPos[0] = fVert.GetXv(); | |
222 | fNominalPos[1] = fVert.GetYv(); | |
223 | fNominalPos[2] = fVert.GetZv(); | |
224 | if(fDebug) printf("No mean vertex: VertexFinder gives (%f, %f, %f)\n",fNominalPos[0],fNominalPos[1],fNominalPos[2]); | |
225 | } else { | |
226 | fNominalPos[0] = 0.; | |
227 | fNominalPos[1] = 0.; | |
228 | fNominalPos[2] = 0.; | |
229 | if(fDebug) printf("No mean vertex and VertexFinder failed\n"); | |
0c69be49 | 230 | } |
07680cae | 231 | } |
fee9ef0d | 232 | |
233 | // TWO ITERATIONS: | |
234 | // | |
235 | // ITERATION 1 | |
236 | // propagate tracks to fNominalPos vertex | |
237 | // preselect them: | |
238 | // if(constraint) reject for |d0|>5*fNSigma*sigma w.r.t. fNominal... vertex | |
239 | // else reject for |d0|\oplus|z0| > 5 mm w.r.t. fNominal... vertex | |
07680cae | 240 | // ITERATION 2 |
241 | // propagate tracks to best between initVertex and fCurrentVertex | |
242 | // preselect tracks (reject for |d0|>fNSigma*sigma w.r.t. best | |
243 | // between initVertex and fCurrentVertex) | |
6d8df534 | 244 | for(Int_t iter=1; iter<=2; iter++) { |
245 | if(fOnlyFitter && iter==1) continue; | |
246 | if(fIdSel) { delete [] fIdSel; fIdSel=NULL; } | |
247 | fIdSel = new UShort_t[nTrksOrig]; | |
248 | Int_t nTrksSel = PrepareTracks(*trkArrayOrig,idOrig,iter); | |
249 | if(fDebug) printf("N tracks selected in iteration %d: %d\n",iter,nTrksSel); | |
250 | if(nTrksSel < fMinTracks) { | |
251 | TooFewTracks(); | |
fee9ef0d | 252 | return fCurrentVertex; |
253 | } | |
07680cae | 254 | |
fee9ef0d | 255 | // vertex finder |
256 | if(!fOnlyFitter) { | |
6d8df534 | 257 | if(nTrksSel==1) { |
fee9ef0d | 258 | if(fDebug) printf("Just one track\n"); |
259 | OneTrackVertFinder(); | |
6d8df534 | 260 | } else { |
fee9ef0d | 261 | switch (fAlgo) { |
262 | case 1: StrLinVertexFinderMinDist(1); break; | |
263 | case 2: StrLinVertexFinderMinDist(0); break; | |
264 | case 3: HelixVertexFinder(); break; | |
265 | case 4: VertexFinder(1); break; | |
266 | case 5: VertexFinder(0); break; | |
267 | default: printf("Wrong algorithm\n"); break; | |
268 | } | |
269 | } | |
270 | if(fDebug) printf(" Vertex finding completed\n"); | |
0c69be49 | 271 | } |
07680cae | 272 | |
fee9ef0d | 273 | // vertex fitter |
6d8df534 | 274 | VertexFitter(); |
fee9ef0d | 275 | } // end loop on the two iterations |
07680cae | 276 | |
fee9ef0d | 277 | |
50ff0bcd | 278 | // set indices of used tracks |
279 | UShort_t *indices = 0; | |
50ff0bcd | 280 | if(fCurrentVertex->GetNContributors()>0) { |
281 | indices = new UShort_t[fCurrentVertex->GetNContributors()]; | |
6d8df534 | 282 | for(Int_t jj=0; jj<(Int_t)fTrkArraySel.GetEntriesFast(); jj++) |
283 | indices[jj] = fIdSel[jj]; | |
50ff0bcd | 284 | fCurrentVertex->SetIndices(fCurrentVertex->GetNContributors(),indices); |
285 | } | |
6d8df534 | 286 | delete [] indices; indices=NULL; |
287 | // | |
fee9ef0d | 288 | |
6d8df534 | 289 | // set vertex title |
290 | TString title="VertexerTracksNoConstraint"; | |
291 | if(fConstraint) { | |
292 | title="VertexerTracksWithConstraint"; | |
293 | if(fOnlyFitter) title.Append("OnlyFitter"); | |
294 | } | |
295 | fCurrentVertex->SetTitle(title.Data()); | |
296 | // | |
a7ede274 | 297 | |
6d8df534 | 298 | if(fDebug) { |
299 | fCurrentVertex->PrintStatus(); | |
300 | fCurrentVertex->PrintIndices(); | |
301 | } | |
50ff0bcd | 302 | |
6d8df534 | 303 | // clean up |
304 | delete [] fIdSel; fIdSel=NULL; | |
305 | fTrkArraySel.Delete(); | |
146c29df | 306 | if(fTrksToSkip) { delete [] fTrksToSkip; fTrksToSkip=NULL; } |
6d8df534 | 307 | // |
fee9ef0d | 308 | |
07680cae | 309 | return fCurrentVertex; |
310 | } | |
50ff0bcd | 311 | //------------------------------------------------------------------------ |
fee9ef0d | 312 | Double_t AliVertexerTracks::GetDeterminant3X3(Double_t matr[][3]) |
313 | { | |
50ff0bcd | 314 | // |
315 | 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]; | |
316 | return det; | |
317 | } | |
318 | //------------------------------------------------------------------------- | |
fee9ef0d | 319 | void AliVertexerTracks::GetStrLinDerivMatrix(Double_t *p0,Double_t *p1,Double_t (*m)[3],Double_t *d) |
320 | { | |
50ff0bcd | 321 | // |
322 | Double_t x12=p0[0]-p1[0]; | |
323 | Double_t y12=p0[1]-p1[1]; | |
324 | Double_t z12=p0[2]-p1[2]; | |
325 | Double_t kk=x12*x12+y12*y12+z12*z12; | |
326 | m[0][0]=2-2/kk*x12*x12; | |
327 | m[0][1]=-2/kk*x12*y12; | |
328 | m[0][2]=-2/kk*x12*z12; | |
329 | m[1][0]=-2/kk*x12*y12; | |
330 | m[1][1]=2-2/kk*y12*y12; | |
331 | m[1][2]=-2/kk*y12*z12; | |
332 | m[2][0]=-2/kk*x12*z12; | |
333 | m[2][1]=-2*y12*z12; | |
334 | m[2][2]=2-2/kk*z12*z12; | |
335 | d[0]=2*p0[0]-2/kk*p0[0]*x12*x12-2/kk*p0[2]*x12*z12-2/kk*p0[1]*x12*y12; | |
336 | d[1]=2*p0[1]-2/kk*p0[1]*y12*y12-2/kk*p0[0]*x12*y12-2/kk*p0[2]*z12*y12; | |
337 | d[2]=2*p0[2]-2/kk*p0[2]*z12*z12-2/kk*p0[0]*x12*z12-2/kk*p0[1]*z12*y12; | |
c5e3e5d1 | 338 | |
50ff0bcd | 339 | } |
340 | //-------------------------------------------------------------------------- | |
fee9ef0d | 341 | void AliVertexerTracks::GetStrLinDerivMatrix(Double_t *p0,Double_t *p1,Double_t *sigmasq,Double_t (*m)[3],Double_t *d) |
342 | { | |
50ff0bcd | 343 | // |
344 | Double_t x12=p1[0]-p0[0]; | |
345 | Double_t y12=p1[1]-p0[1]; | |
346 | Double_t z12=p1[2]-p0[2]; | |
c5e3e5d1 | 347 | |
50ff0bcd | 348 | Double_t den= x12*x12*sigmasq[1]*sigmasq[2]+y12*y12*sigmasq[0]*sigmasq[2]+z12*z12*sigmasq[0]*sigmasq[1]; |
c5e3e5d1 | 349 | |
50ff0bcd | 350 | Double_t kk= 2*(x12*x12/sigmasq[0]+y12*y12/sigmasq[1]+z12*z12/sigmasq[2]); |
c5e3e5d1 | 351 | |
50ff0bcd | 352 | Double_t cc[3]; |
353 | cc[0]=-x12/sigmasq[0]; | |
354 | cc[1]=-y12/sigmasq[1]; | |
355 | cc[2]=-z12/sigmasq[2]; | |
ec1be5d5 | 356 | |
50ff0bcd | 357 | 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 | 358 | |
50ff0bcd | 359 | Double_t ss= -p0[0]*cc[0]-p0[1]*cc[1]-p0[2]*cc[2]; |
2d57349e | 360 | |
50ff0bcd | 361 | Double_t aa[3]; |
362 | aa[0]=x12*sigmasq[1]*sigmasq[2]/den; | |
363 | aa[1]=y12*sigmasq[0]*sigmasq[2]/den; | |
364 | aa[2]=z12*sigmasq[0]*sigmasq[1]/den; | |
2d57349e | 365 | |
50ff0bcd | 366 | m[0][0]=aa[0]*(aa[0]*kk+2*cc[0])+2*cc[0]*aa[0]+2/sigmasq[0]; |
367 | m[0][1]=aa[1]*(aa[0]*kk+2*cc[0])+2*cc[1]*aa[0]; | |
368 | m[0][2]=aa[2]*(aa[0]*kk+2*cc[0])+2*cc[2]*aa[0]; | |
2d57349e | 369 | |
50ff0bcd | 370 | m[1][0]=aa[0]*(aa[1]*kk+2*cc[1])+2*cc[0]*aa[1]; |
371 | m[1][1]=aa[1]*(aa[1]*kk+2*cc[1])+2*cc[1]*aa[1]+2/sigmasq[1]; | |
372 | m[1][2]=aa[2]*(aa[1]*kk+2*cc[1])+2*cc[2]*aa[1]; | |
2d57349e | 373 | |
50ff0bcd | 374 | m[2][0]=aa[0]*(aa[2]*kk+2*cc[2])+2*cc[0]*aa[2]; |
375 | m[2][1]=aa[1]*(aa[2]*kk+2*cc[2])+2*cc[1]*aa[2]; | |
376 | m[2][2]=aa[2]*(aa[2]*kk+2*cc[2])+2*cc[2]*aa[2]+2/sigmasq[2]; | |
08df6187 | 377 | |
50ff0bcd | 378 | d[0]=-ww*(aa[0]*kk+2*cc[0])-2*ss*aa[0]+2*p0[0]/sigmasq[0]; |
379 | d[1]=-ww*(aa[1]*kk+2*cc[1])-2*ss*aa[1]+2*p0[1]/sigmasq[1]; | |
380 | d[2]=-ww*(aa[2]*kk+2*cc[2])-2*ss*aa[2]+2*p0[2]/sigmasq[2]; | |
2d57349e | 381 | |
2d57349e | 382 | } |
50ff0bcd | 383 | //-------------------------------------------------------------------------- |
fee9ef0d | 384 | Double_t AliVertexerTracks::GetStrLinMinDist(Double_t *p0,Double_t *p1,Double_t *x0) |
385 | { | |
50ff0bcd | 386 | // |
387 | Double_t x12=p0[0]-p1[0]; | |
388 | Double_t y12=p0[1]-p1[1]; | |
389 | Double_t z12=p0[2]-p1[2]; | |
390 | Double_t x10=p0[0]-x0[0]; | |
391 | Double_t y10=p0[1]-x0[1]; | |
392 | Double_t z10=p0[2]-x0[2]; | |
393 | 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); | |
2d57349e | 394 | } |
395 | //--------------------------------------------------------------------------- | |
fee9ef0d | 396 | void AliVertexerTracks::OneTrackVertFinder() |
397 | { | |
0c69be49 | 398 | // find vertex for events with 1 track, using DCA to nominal beam axis |
6d8df534 | 399 | if(fDebug) printf("Number of prepared tracks =%d - Call OneTrackVertFinder",fTrkArraySel.GetEntries()); |
400 | AliExternalTrackParam *track1; | |
401 | track1 = (AliExternalTrackParam*)fTrkArraySel.At(0); | |
dc3719f3 | 402 | Double_t field=GetFieldkG(); |
0c69be49 | 403 | Double_t alpha=track1->GetAlpha(); |
404 | Double_t mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; | |
405 | Double_t pos[3],dir[3]; | |
406 | track1->GetXYZAt(mindist,field,pos); | |
407 | track1->GetPxPyPzAt(mindist,field,dir); | |
408 | AliStrLine *line1 = new AliStrLine(pos,dir); | |
409 | Double_t p1[3]={fNominalPos[0],fNominalPos[1],0.}; | |
410 | Double_t p2[3]={fNominalPos[0],fNominalPos[1],10.}; | |
411 | AliStrLine *zeta=new AliStrLine(p1,p2,kTRUE); | |
412 | Double_t crosspoint[3]={0.,0.,0.}; | |
413 | Double_t sigma=999.; | |
414 | Int_t nContrib=-1; | |
415 | Int_t retcode = zeta->Cross(line1,crosspoint); | |
416 | if(retcode>=0){ | |
417 | sigma=line1->GetDistFromPoint(crosspoint); | |
418 | nContrib=1; | |
419 | } | |
420 | delete zeta; | |
421 | delete line1; | |
422 | fVert.SetXYZ(crosspoint); | |
423 | fVert.SetDispersion(sigma); | |
424 | fVert.SetNContributors(nContrib); | |
425 | } | |
426 | //--------------------------------------------------------------------------- | |
fee9ef0d | 427 | void AliVertexerTracks::HelixVertexFinder() |
428 | { | |
2d57349e | 429 | // Get estimate of vertex position in (x,y) from tracks DCA |
430 | ||
431 | ||
432 | Double_t initPos[3]; | |
433 | initPos[2] = 0.; | |
434 | for(Int_t i=0;i<2;i++)initPos[i]=fNominalPos[i]; | |
dc3719f3 | 435 | Double_t field=GetFieldkG(); |
2d57349e | 436 | |
6d8df534 | 437 | Int_t nacc = (Int_t)fTrkArraySel.GetEntriesFast(); |
2d57349e | 438 | |
439 | Double_t aver[3]={0.,0.,0.}; | |
440 | Double_t averquad[3]={0.,0.,0.}; | |
441 | Double_t sigmaquad[3]={0.,0.,0.}; | |
442 | Double_t sigma=0; | |
443 | Int_t ncombi = 0; | |
6d8df534 | 444 | AliExternalTrackParam *track1; |
445 | AliExternalTrackParam *track2; | |
2d57349e | 446 | Double_t distCA; |
6d8df534 | 447 | Double_t x; |
2d57349e | 448 | Double_t alpha, cs, sn; |
449 | Double_t crosspoint[3]; | |
450 | for(Int_t i=0; i<nacc; i++){ | |
6d8df534 | 451 | track1 = (AliExternalTrackParam*)fTrkArraySel.At(i); |
2d57349e | 452 | |
453 | ||
454 | for(Int_t j=i+1; j<nacc; j++){ | |
6d8df534 | 455 | track2 = (AliExternalTrackParam*)fTrkArraySel.At(j); |
2d57349e | 456 | |
457 | distCA=track2->PropagateToDCA(track1,field); | |
2d57349e | 458 | if(fDCAcut<=0 ||(fDCAcut>0&&distCA<fDCAcut)){ |
6d8df534 | 459 | x=track1->GetX(); |
2d57349e | 460 | alpha=track1->GetAlpha(); |
461 | cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); | |
6d8df534 | 462 | Double_t x1=x*cs - track1->GetY()*sn; |
463 | Double_t y1=x*sn + track1->GetY()*cs; | |
464 | Double_t z1=track1->GetZ(); | |
465 | ||
2d57349e | 466 | Double_t sx1=sn*sn*track1->GetSigmaY2(), sy1=cs*cs*track1->GetSigmaY2(); |
6d8df534 | 467 | x=track2->GetX(); |
2d57349e | 468 | alpha=track2->GetAlpha(); |
469 | cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); | |
6d8df534 | 470 | Double_t x2=x*cs - track2->GetY()*sn; |
471 | Double_t y2=x*sn + track2->GetY()*cs; | |
472 | Double_t z2=track2->GetZ(); | |
2d57349e | 473 | Double_t sx2=sn*sn*track2->GetSigmaY2(), sy2=cs*cs*track2->GetSigmaY2(); |
474 | Double_t sz1=track1->GetSigmaZ2(), sz2=track2->GetSigmaZ2(); | |
475 | Double_t wx1=sx2/(sx1+sx2), wx2=1.- wx1; | |
476 | Double_t wy1=sy2/(sy1+sy2), wy2=1.- wy1; | |
477 | Double_t wz1=sz2/(sz1+sz2), wz2=1.- wz1; | |
478 | crosspoint[0]=wx1*x1 + wx2*x2; | |
479 | crosspoint[1]=wy1*y1 + wy2*y2; | |
480 | crosspoint[2]=wz1*z1 + wz2*z2; | |
481 | ||
482 | ncombi++; | |
483 | for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj]; | |
484 | for(Int_t jj=0;jj<3;jj++)averquad[jj]+=(crosspoint[jj]*crosspoint[jj]); | |
485 | } | |
486 | } | |
487 | ||
488 | } | |
489 | if(ncombi>0){ | |
490 | for(Int_t jj=0;jj<3;jj++){ | |
491 | initPos[jj] = aver[jj]/ncombi; | |
492 | averquad[jj]/=ncombi; | |
493 | sigmaquad[jj]=averquad[jj]-initPos[jj]*initPos[jj]; | |
494 | sigma+=sigmaquad[jj]; | |
495 | } | |
496 | sigma=TMath::Sqrt(TMath::Abs(sigma)); | |
497 | } | |
498 | else { | |
499 | Warning("HelixVertexFinder","Finder did not succed"); | |
500 | sigma=999; | |
501 | } | |
502 | fVert.SetXYZ(initPos); | |
503 | fVert.SetDispersion(sigma); | |
504 | fVert.SetNContributors(ncombi); | |
505 | } | |
50ff0bcd | 506 | //---------------------------------------------------------------------------- |
6d8df534 | 507 | Int_t AliVertexerTracks::PrepareTracks(TObjArray &trkArrayOrig, |
508 | UShort_t *idOrig, | |
509 | Int_t optImpParCut) | |
fee9ef0d | 510 | { |
50ff0bcd | 511 | // |
512 | // Propagate tracks to initial vertex position and store them in a TObjArray | |
513 | // | |
6d8df534 | 514 | if(fDebug) printf(" PrepareTracks()\n"); |
515 | ||
516 | Int_t nTrksOrig = (Int_t)trkArrayOrig.GetEntriesFast(); | |
517 | Int_t nTrksSel = 0; | |
fee9ef0d | 518 | Double_t maxd0rphi; |
519 | Double_t maxd0z0 = fMaxd0z0; // default is 5 mm | |
50ff0bcd | 520 | Double_t sigmaCurr[3]; |
fee9ef0d | 521 | Double_t normdistx,normdisty; |
6d8df534 | 522 | Double_t d0z0[2],covd0z0[3]; |
50ff0bcd | 523 | Double_t sigma; |
6d8df534 | 524 | Double_t field = GetFieldkG(); |
50ff0bcd | 525 | |
526 | AliESDVertex *initVertex = new AliESDVertex(fNominalPos,fNominalCov,1,1); | |
527 | ||
6d8df534 | 528 | if(!fTrkArraySel.IsEmpty()) fTrkArraySel.Delete(); |
50ff0bcd | 529 | |
6d8df534 | 530 | AliExternalTrackParam *track=0; |
50ff0bcd | 531 | |
6d8df534 | 532 | for(Int_t i=0; i<nTrksOrig; i++) { |
533 | track = new AliExternalTrackParam(*(AliExternalTrackParam*)trkArrayOrig.At(i)); | |
534 | // only TPC tracks in |eta|<0.9 | |
535 | if(!fITSrefit && TMath::Abs(track->GetTgl())>1.) { | |
536 | delete track; | |
537 | continue; | |
538 | } | |
50ff0bcd | 539 | |
540 | // propagate track to vertex | |
fee9ef0d | 541 | if(optImpParCut<=1 || fOnlyFitter) { // optImpParCut==1 or 0 |
6d8df534 | 542 | track->PropagateToDCA(initVertex,field,100.,d0z0,covd0z0); |
fee9ef0d | 543 | } else { // optImpParCut==2 |
50ff0bcd | 544 | fCurrentVertex->GetSigmaXYZ(sigmaCurr); |
fee9ef0d | 545 | normdistx = TMath::Abs(fCurrentVertex->GetXv()-fNominalPos[0])/TMath::Sqrt(sigmaCurr[0]*sigmaCurr[0]+fNominalCov[0]); |
80d36431 | 546 | normdisty = TMath::Abs(fCurrentVertex->GetYv()-fNominalPos[1])/TMath::Sqrt(sigmaCurr[1]*sigmaCurr[1]+fNominalCov[2]); |
fee9ef0d | 547 | if(normdistx < 3. && normdisty < 3. && |
80d36431 | 548 | (sigmaCurr[0]+sigmaCurr[1])<(TMath::Sqrt(fNominalCov[0])+TMath::Sqrt(fNominalCov[2]))) { |
6d8df534 | 549 | track->PropagateToDCA(fCurrentVertex,field,100.,d0z0,covd0z0); |
50ff0bcd | 550 | } else { |
6d8df534 | 551 | track->PropagateToDCA(initVertex,field,100.,d0z0,covd0z0); |
50ff0bcd | 552 | } |
553 | } | |
554 | ||
50ff0bcd | 555 | sigma = TMath::Sqrt(covd0z0[0]); |
556 | maxd0rphi = fNSigma*sigma; | |
fee9ef0d | 557 | if(optImpParCut==1) maxd0rphi *= 5.; |
558 | ||
6d8df534 | 559 | if(fDebug) printf("trk %d; id %d; |d0| = %f; d0 cut = %f; |z0| = %f; |d0|oplus|z0| = %f; d0z0 cut = %f\n",i,(Int_t)idOrig[i],TMath::Abs(d0z0[0]),maxd0rphi,TMath::Abs(d0z0[1]),TMath::Sqrt(d0z0[0]*d0z0[0]+d0z0[1]*d0z0[1]),maxd0z0); |
fee9ef0d | 560 | |
80d36431 | 561 | // during iterations 1 and 2, if fConstraint=kFALSE, |
fee9ef0d | 562 | // select tracks with d0oplusz0 < maxd0z0 |
6d8df534 | 563 | if(optImpParCut>=1 && !fConstraint && nTrksOrig>=3 && |
fee9ef0d | 564 | fVert.GetNContributors()>0) { |
565 | if(TMath::Sqrt(d0z0[0]*d0z0[0]+d0z0[1]*d0z0[1]) > maxd0z0) { | |
566 | if(fDebug) printf(" rejected\n"); | |
567 | delete track; continue; | |
568 | } | |
569 | } | |
570 | ||
571 | // select tracks with d0rphi < maxd0rphi | |
6d8df534 | 572 | if(optImpParCut>0 && TMath::Abs(d0z0[0])>maxd0rphi) { |
50ff0bcd | 573 | if(fDebug) printf(" rejected\n"); |
574 | delete track; continue; | |
575 | } | |
576 | ||
6d8df534 | 577 | fTrkArraySel.AddLast(track); |
578 | fIdSel[nTrksSel] = idOrig[i]; | |
579 | nTrksSel++; | |
50ff0bcd | 580 | } |
581 | ||
582 | delete initVertex; | |
583 | ||
6d8df534 | 584 | return nTrksSel; |
50ff0bcd | 585 | } |
586 | //--------------------------------------------------------------------------- | |
fee9ef0d | 587 | AliESDVertex* AliVertexerTracks::RemoveTracksFromVertex(AliESDVertex *inVtx, |
6d8df534 | 588 | TObjArray *trkArray, |
589 | UShort_t *id, | |
fee9ef0d | 590 | Float_t *diamondxy) |
591 | { | |
50ff0bcd | 592 | // |
fee9ef0d | 593 | // Removes tracks in trksTree from fit of inVtx |
50ff0bcd | 594 | // |
fee9ef0d | 595 | |
146c29df | 596 | if(!strstr(inVtx->GetTitle(),"VertexerTracksWithConstraint")) { |
597 | printf("ERROR: primary vertex has no constraint: cannot remove tracks\n"); | |
598 | return 0x0; | |
599 | } | |
fee9ef0d | 600 | if(!strstr(inVtx->GetTitle(),"VertexerTracksWithConstraintOnlyFitter")) |
601 | printf("WARNING: result of tracks' removal will be only approximately correct\n"); | |
602 | ||
603 | TMatrixD rv(3,1); | |
604 | rv(0,0) = inVtx->GetXv(); | |
605 | rv(1,0) = inVtx->GetYv(); | |
606 | rv(2,0) = inVtx->GetZv(); | |
607 | TMatrixD vV(3,3); | |
608 | Double_t cov[6]; | |
609 | inVtx->GetCovMatrix(cov); | |
610 | vV(0,0) = cov[0]; | |
611 | vV(0,1) = cov[1]; vV(1,0) = cov[1]; | |
612 | vV(1,1) = cov[2]; | |
613 | vV(0,2) = cov[3]; vV(2,0) = cov[3]; | |
614 | vV(1,2) = cov[4]; vV(2,1) = cov[4]; | |
615 | vV(2,2) = cov[5]; | |
616 | ||
617 | TMatrixD sumWi(TMatrixD::kInverted,vV); | |
618 | TMatrixD sumWiri(sumWi,TMatrixD::kMult,rv); | |
619 | ||
620 | Int_t nUsedTrks = inVtx->GetNContributors(); | |
621 | Double_t chi2 = inVtx->GetChi2(); | |
622 | ||
6d8df534 | 623 | AliExternalTrackParam *track = 0; |
624 | Int_t ntrks = (Int_t)trkArray->GetEntriesFast(); | |
fee9ef0d | 625 | for(Int_t i=0;i<ntrks;i++) { |
6d8df534 | 626 | track = (AliExternalTrackParam*)trkArray->At(i); |
627 | if(!inVtx->UsesTrack(id[i])) { | |
628 | printf("track %d was not used in vertex fit\n",id[i]); | |
fee9ef0d | 629 | continue; |
630 | } | |
631 | Double_t alpha = track->GetAlpha(); | |
632 | Double_t xl = diamondxy[0]*TMath::Cos(alpha)+diamondxy[1]*TMath::Sin(alpha); | |
6d8df534 | 633 | track->PropagateTo(xl,GetFieldkG()); |
fee9ef0d | 634 | // vector of track global coordinates |
635 | TMatrixD ri(3,1); | |
636 | // covariance matrix of ri | |
637 | TMatrixD wWi(3,3); | |
638 | ||
639 | // get space point from track | |
640 | if(!TrackToPoint(track,ri,wWi)) continue; | |
641 | ||
642 | TMatrixD wWiri(wWi,TMatrixD::kMult,ri); | |
643 | ||
644 | sumWi -= wWi; | |
645 | sumWiri -= wWiri; | |
646 | ||
647 | // track chi2 | |
648 | TMatrixD deltar = rv; deltar -= ri; | |
649 | TMatrixD wWideltar(wWi,TMatrixD::kMult,deltar); | |
650 | Double_t chi2i = deltar(0,0)*wWideltar(0,0)+ | |
651 | deltar(1,0)*wWideltar(1,0)+ | |
652 | deltar(2,0)*wWideltar(2,0); | |
653 | // remove from total chi2 | |
654 | chi2 -= chi2i; | |
655 | ||
656 | nUsedTrks--; | |
657 | if(nUsedTrks<2) { | |
658 | printf("Trying to remove too many tracks!\n"); | |
659 | return 0x0; | |
660 | } | |
661 | } | |
662 | ||
663 | TMatrixD rvnew(3,1); | |
664 | TMatrixD vVnew(3,3); | |
665 | ||
666 | // new inverted of weights matrix | |
667 | TMatrixD invsumWi(TMatrixD::kInverted,sumWi); | |
668 | vVnew = invsumWi; | |
669 | // new position of primary vertex | |
670 | rvnew.Mult(vVnew,sumWiri); | |
671 | ||
672 | Double_t position[3]; | |
673 | position[0] = rvnew(0,0); | |
674 | position[1] = rvnew(1,0); | |
675 | position[2] = rvnew(2,0); | |
676 | cov[0] = vVnew(0,0); | |
677 | cov[1] = vVnew(0,1); | |
678 | cov[2] = vVnew(1,1); | |
679 | cov[3] = vVnew(0,2); | |
680 | cov[4] = vVnew(1,2); | |
681 | cov[5] = vVnew(2,2); | |
682 | ||
683 | // store data in the vertex object | |
684 | AliESDVertex *outVtx = new AliESDVertex(position,cov,chi2,nUsedTrks); | |
685 | outVtx->SetTitle(inVtx->GetTitle()); | |
fee9ef0d | 686 | UShort_t *inindices = inVtx->GetIndices(); |
687 | UShort_t *outindices = new UShort_t[outVtx->GetNContributors()]; | |
688 | Int_t j=0; | |
fee9ef0d | 689 | for(Int_t k=0; k<inVtx->GetNIndices(); k++) { |
6d8df534 | 690 | Bool_t copyindex=kTRUE; |
fee9ef0d | 691 | for(Int_t l=0; l<ntrks; l++) { |
6d8df534 | 692 | if(inindices[k]==id[l]) copyindex=kFALSE; |
fee9ef0d | 693 | } |
694 | if(copyindex) { | |
695 | outindices[j] = inindices[k]; j++; | |
696 | } | |
697 | } | |
698 | outVtx->SetIndices(outVtx->GetNContributors(),outindices); | |
699 | delete [] outindices; | |
700 | ||
701 | if(fDebug) { | |
702 | printf("Vertex before removing tracks:\n"); | |
703 | inVtx->PrintStatus(); | |
704 | inVtx->PrintIndices(); | |
705 | printf("Vertex after removing tracks:\n"); | |
706 | outVtx->PrintStatus(); | |
707 | outVtx->PrintIndices(); | |
708 | } | |
709 | ||
710 | return outVtx; | |
711 | } | |
712 | //--------------------------------------------------------------------------- | |
713 | void AliVertexerTracks::SetSkipTracks(Int_t n,Int_t *skipped) | |
714 | { | |
715 | // | |
716 | // Mark the tracks not to be used in the vertex reconstruction. | |
717 | // Tracks are identified by AliESDtrack::GetID() | |
718 | // | |
719 | fNTrksToSkip = n; fTrksToSkip = new Int_t[n]; | |
50ff0bcd | 720 | for(Int_t i=0;i<n;i++) fTrksToSkip[i] = skipped[i]; |
721 | return; | |
722 | } | |
723 | //--------------------------------------------------------------------------- | |
fee9ef0d | 724 | void AliVertexerTracks::SetVtxStart(AliESDVertex *vtx) |
725 | { | |
50ff0bcd | 726 | // |
727 | // Set initial vertex knowledge | |
728 | // | |
729 | vtx->GetXYZ(fNominalPos); | |
730 | vtx->GetCovMatrix(fNominalCov); | |
fee9ef0d | 731 | SetConstraintOn(); |
50ff0bcd | 732 | return; |
733 | } | |
2d57349e | 734 | //--------------------------------------------------------------------------- |
fee9ef0d | 735 | void AliVertexerTracks::StrLinVertexFinderMinDist(Int_t optUseWeights) |
dc3719f3 | 736 | { |
6d8df534 | 737 | AliExternalTrackParam *track1; |
dc3719f3 | 738 | Double_t field=GetFieldkG(); |
6d8df534 | 739 | const Int_t knacc = (Int_t)fTrkArraySel.GetEntriesFast(); |
dc3719f3 | 740 | TClonesArray *linarray = new TClonesArray("AliStrLine",1000); |
741 | TClonesArray &lines = *linarray; | |
742 | for(Int_t i=0; i<knacc; i++){ | |
6d8df534 | 743 | track1 = (AliExternalTrackParam*)fTrkArraySel.At(i); |
dc3719f3 | 744 | Double_t alpha=track1->GetAlpha(); |
745 | Double_t mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; | |
746 | Double_t pos[3],dir[3],sigmasq[3]; | |
747 | track1->GetXYZAt(mindist,field,pos); | |
748 | track1->GetPxPyPzAt(mindist,field,dir); | |
749 | sigmasq[0]=TMath::Sin(alpha)*TMath::Sin(alpha)*track1->GetSigmaY2(); | |
750 | sigmasq[1]=TMath::Cos(alpha)*TMath::Cos(alpha)*track1->GetSigmaY2(); | |
751 | sigmasq[2]=track1->GetSigmaZ2(); | |
146c29df | 752 | TMatrixD ri(3,1); |
753 | TMatrixD wWi(3,3); | |
754 | if(!TrackToPoint(track1,ri,wWi)) continue; | |
755 | Double_t wmat[9]; | |
756 | Int_t iel=0; | |
757 | for(Int_t ia=0;ia<3;ia++){ | |
758 | for(Int_t ib=0;ib<3;ib++){ | |
759 | wmat[iel]=wWi(ia,ib); | |
760 | iel++; | |
761 | } | |
762 | } | |
763 | new(lines[i]) AliStrLine(pos,sigmasq,wmat,dir); | |
dc3719f3 | 764 | } |
765 | fVert=TrackletVertexFinder(linarray,optUseWeights); | |
766 | linarray->Delete(); | |
767 | delete linarray; | |
768 | } | |
769 | //--------------------------------------------------------------------------- | |
146c29df | 770 | AliESDVertex AliVertexerTracks::TrackletVertexFinder(TClonesArray *lines, Int_t optUseWeights) |
fee9ef0d | 771 | { |
2d57349e | 772 | // Calculate the point at minimum distance to prepared tracks |
773 | ||
dc3719f3 | 774 | const Int_t knacc = (Int_t)lines->GetEntriesFast(); |
775 | Double_t initPos[3]={0.,0.,0.}; | |
2d57349e | 776 | |
2d57349e | 777 | Double_t (*vectP0)[3]=new Double_t [knacc][3]; |
778 | Double_t (*vectP1)[3]=new Double_t [knacc][3]; | |
779 | ||
780 | Double_t sum[3][3]; | |
781 | Double_t dsum[3]={0,0,0}; | |
146c29df | 782 | TMatrixD sumWi(3,3); |
783 | for(Int_t i=0;i<3;i++){ | |
784 | for(Int_t j=0;j<3;j++){ | |
785 | sum[i][j]=0; | |
786 | sumWi(i,j)=0.; | |
787 | } | |
788 | } | |
789 | ||
2d57349e | 790 | for(Int_t i=0; i<knacc; i++){ |
dc3719f3 | 791 | AliStrLine* line1 = (AliStrLine*)lines->At(i); |
792 | Double_t p0[3],cd[3],sigmasq[3]; | |
146c29df | 793 | Double_t wmat[9]; |
2d57349e | 794 | line1->GetP0(p0); |
795 | line1->GetCd(cd); | |
dc3719f3 | 796 | line1->GetSigma2P0(sigmasq); |
146c29df | 797 | line1->GetWMatrix(wmat); |
798 | TMatrixD wWi(3,3); | |
799 | Int_t iel=0; | |
800 | for(Int_t ia=0;ia<3;ia++){ | |
801 | for(Int_t ib=0;ib<3;ib++){ | |
802 | wWi(ia,ib)=wmat[iel]; | |
803 | iel++; | |
804 | } | |
805 | } | |
806 | ||
807 | sumWi+=wWi; | |
808 | ||
2d57349e | 809 | Double_t p1[3]={p0[0]+cd[0],p0[1]+cd[1],p0[2]+cd[2]}; |
810 | vectP0[i][0]=p0[0]; | |
811 | vectP0[i][1]=p0[1]; | |
812 | vectP0[i][2]=p0[2]; | |
813 | vectP1[i][0]=p1[0]; | |
814 | vectP1[i][1]=p1[1]; | |
815 | vectP1[i][2]=p1[2]; | |
816 | ||
817 | Double_t matr[3][3]; | |
818 | Double_t dknow[3]; | |
819 | if(optUseWeights==0)GetStrLinDerivMatrix(p0,p1,matr,dknow); | |
dc3719f3 | 820 | else GetStrLinDerivMatrix(p0,p1,sigmasq,matr,dknow); |
821 | ||
2d57349e | 822 | |
823 | for(Int_t iii=0;iii<3;iii++){ | |
824 | dsum[iii]+=dknow[iii]; | |
825 | for(Int_t lj=0;lj<3;lj++) sum[iii][lj]+=matr[iii][lj]; | |
826 | } | |
2d57349e | 827 | } |
146c29df | 828 | |
829 | TMatrixD invsumWi(TMatrixD::kInverted,sumWi); | |
830 | Double_t covmatrix[6]; | |
831 | covmatrix[0] = invsumWi(0,0); | |
832 | covmatrix[1] = invsumWi(0,1); | |
833 | covmatrix[2] = invsumWi(1,1); | |
834 | covmatrix[3] = invsumWi(0,2); | |
835 | covmatrix[4] = invsumWi(1,2); | |
836 | covmatrix[5] = invsumWi(2,2); | |
837 | ||
2d57349e | 838 | Double_t vett[3][3]; |
839 | Double_t det=GetDeterminant3X3(sum); | |
dc3719f3 | 840 | Double_t sigma=0; |
2d57349e | 841 | |
fee9ef0d | 842 | if(det!=0){ |
843 | for(Int_t zz=0;zz<3;zz++){ | |
844 | for(Int_t ww=0;ww<3;ww++){ | |
845 | for(Int_t kk=0;kk<3;kk++) vett[ww][kk]=sum[ww][kk]; | |
846 | } | |
847 | for(Int_t kk=0;kk<3;kk++) vett[kk][zz]=dsum[kk]; | |
848 | initPos[zz]=GetDeterminant3X3(vett)/det; | |
849 | } | |
850 | ||
851 | ||
852 | for(Int_t i=0; i<knacc; i++){ | |
853 | Double_t p0[3]={0,0,0},p1[3]={0,0,0}; | |
854 | for(Int_t ii=0;ii<3;ii++){ | |
855 | p0[ii]=vectP0[i][ii]; | |
856 | p1[ii]=vectP1[i][ii]; | |
857 | } | |
858 | sigma+=GetStrLinMinDist(p0,p1,initPos); | |
859 | } | |
860 | ||
861 | sigma=TMath::Sqrt(sigma); | |
862 | }else{ | |
50ff0bcd | 863 | sigma=999; |
864 | } | |
146c29df | 865 | AliESDVertex theVert(initPos,covmatrix,99999.,knacc); |
866 | theVert.SetDispersion(sigma); | |
50ff0bcd | 867 | delete vectP0; |
868 | delete vectP1; | |
dc3719f3 | 869 | return theVert; |
50ff0bcd | 870 | } |
871 | //--------------------------------------------------------------------------- | |
6d8df534 | 872 | Bool_t AliVertexerTracks::TrackToPoint(AliExternalTrackParam *t, |
0bf2e2b4 | 873 | TMatrixD &ri,TMatrixD &wWi, |
874 | Bool_t uUi3by3) const | |
fee9ef0d | 875 | { |
876 | // | |
6d8df534 | 877 | // Extract from the AliExternalTrackParam the global coordinates ri and covariance matrix |
fee9ef0d | 878 | // wWi of the space point that it represents (to be used in VertexFitter()) |
879 | // | |
880 | ||
881 | ||
882 | Double_t rotAngle = t->GetAlpha(); | |
883 | if(rotAngle<0.) rotAngle += 2.*TMath::Pi(); | |
884 | Double_t cosRot = TMath::Cos(rotAngle); | |
885 | Double_t sinRot = TMath::Sin(rotAngle); | |
886 | ||
887 | ri(0,0) = t->GetX()*cosRot-t->GetY()*sinRot; | |
888 | ri(1,0) = t->GetX()*sinRot+t->GetY()*cosRot; | |
889 | ri(2,0) = t->GetZ(); | |
890 | ||
0bf2e2b4 | 891 | |
892 | ||
893 | if(!uUi3by3) { | |
894 | // matrix to go from global (x,y,z) to local (y,z); | |
895 | TMatrixD qQi(2,3); | |
896 | qQi(0,0) = -sinRot; | |
897 | qQi(0,1) = cosRot; | |
898 | qQi(0,2) = 0.; | |
899 | qQi(1,0) = 0.; | |
900 | qQi(1,1) = 0.; | |
901 | qQi(1,2) = 1.; | |
902 | ||
903 | // covariance matrix of local (y,z) - inverted | |
0bf2e2b4 | 904 | TMatrixD uUi(2,2); |
6d8df534 | 905 | uUi(0,0) = t->GetSigmaY2(); |
906 | uUi(0,1) = t->GetSigmaZY(); | |
907 | uUi(1,0) = t->GetSigmaZY(); | |
908 | uUi(1,1) = t->GetSigmaZ2(); | |
0bf2e2b4 | 909 | //printf(" Ui :\n"); |
910 | //printf(" %f %f\n",uUi(0,0),uUi(0,1)); | |
911 | //printf(" %f %f\n",uUi(1,0),uUi(1,1)); | |
912 | ||
913 | if(uUi.Determinant() <= 0.) return kFALSE; | |
914 | TMatrixD uUiInv(TMatrixD::kInverted,uUi); | |
915 | ||
916 | // weights matrix: wWi = qQiT * uUiInv * qQi | |
917 | TMatrixD uUiInvQi(uUiInv,TMatrixD::kMult,qQi); | |
918 | TMatrixD m(qQi,TMatrixD::kTransposeMult,uUiInvQi); | |
919 | wWi = m; | |
920 | } else { | |
921 | if(fVert.GetNContributors()<1) AliFatal("Vertex from finder is empty"); | |
922 | // matrix to go from global (x,y,z) to local (x,y,z); | |
923 | TMatrixD qQi(3,3); | |
924 | qQi(0,0) = cosRot; | |
925 | qQi(0,1) = sinRot; | |
926 | qQi(0,2) = 0.; | |
927 | qQi(1,0) = -sinRot; | |
928 | qQi(1,1) = cosRot; | |
929 | qQi(1,2) = 0.; | |
930 | qQi(2,0) = 0.; | |
931 | qQi(2,1) = 0.; | |
932 | qQi(2,2) = 1.; | |
933 | ||
934 | // covariance of fVert along the track | |
935 | Double_t p[3],pt,ptot; | |
936 | t->GetPxPyPz(p); | |
937 | pt = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]); | |
938 | ptot = TMath::Sqrt(pt*pt+p[2]*p[2]); | |
3b768a1d | 939 | Double_t cphi = p[0]/pt; //cos(phi)=px/pt |
940 | Double_t sphi = p[1]/pt; //sin(phi)=py/pt | |
941 | Double_t clambda = pt/ptot; //cos(lambda)=pt/ptot | |
942 | Double_t slambda = p[2]/ptot; //sin(lambda)=pz/ptot | |
0bf2e2b4 | 943 | Double_t covfVert[6]; |
944 | fVert.GetCovMatrix(covfVert); | |
945 | Double_t covfVertalongt = | |
3b768a1d | 946 | covfVert[0]*cphi*cphi*clambda*clambda |
947 | +covfVert[1]*2.*cphi*sphi*clambda*clambda | |
948 | +covfVert[3]*2.*cphi*clambda*slambda | |
949 | +covfVert[2]*sphi*sphi*clambda*clambda | |
950 | +covfVert[4]*2.*sphi*clambda*slambda | |
951 | +covfVert[5]*slambda*slambda; | |
0bf2e2b4 | 952 | // covariance matrix of local (x,y,z) - inverted |
953 | TMatrixD uUi(3,3); | |
3b768a1d | 954 | uUi(0,0) = covfVertalongt * fnSigmaForUi00 * fnSigmaForUi00; |
0bf2e2b4 | 955 | if(fDebug) printf("=====> sqrtUi00 cm %f\n",TMath::Sqrt(uUi(0,0))); |
956 | uUi(0,1) = 0.; | |
957 | uUi(0,2) = 0.; | |
958 | uUi(1,0) = 0.; | |
6d8df534 | 959 | uUi(1,1) = t->GetSigmaY2(); |
960 | uUi(1,2) = t->GetSigmaZY(); | |
0bf2e2b4 | 961 | uUi(2,0) = 0.; |
6d8df534 | 962 | uUi(2,1) = t->GetSigmaZY(); |
963 | uUi(2,2) = t->GetSigmaZ2(); | |
0bf2e2b4 | 964 | //printf(" Ui :\n"); |
965 | //printf(" %f %f\n",uUi(0,0),uUi(0,1)); | |
966 | //printf(" %f %f\n",uUi(1,0),uUi(1,1)); | |
fee9ef0d | 967 | |
0bf2e2b4 | 968 | if(uUi.Determinant() <= 0.) return kFALSE; |
969 | TMatrixD uUiInv(TMatrixD::kInverted,uUi); | |
970 | ||
971 | // weights matrix: wWi = qQiT * uUiInv * qQi | |
972 | TMatrixD uUiInvQi(uUiInv,TMatrixD::kMult,qQi); | |
973 | TMatrixD m(qQi,TMatrixD::kTransposeMult,uUiInvQi); | |
974 | wWi = m; | |
975 | } | |
976 | ||
fee9ef0d | 977 | |
978 | return kTRUE; | |
979 | } | |
980 | //--------------------------------------------------------------------------- | |
6d8df534 | 981 | void AliVertexerTracks::TooFewTracks() |
fee9ef0d | 982 | { |
50ff0bcd | 983 | // |
6d8df534 | 984 | // When the number of tracks is < fMinTracks, |
985 | // deal with vertices not found and prepare to exit | |
50ff0bcd | 986 | // |
6d8df534 | 987 | if(fDebug) printf("TooFewTracks\n"); |
2d57349e | 988 | |
50ff0bcd | 989 | Double_t pos[3],err[3]; |
50ff0bcd | 990 | pos[0] = fNominalPos[0]; |
991 | err[0] = TMath::Sqrt(fNominalCov[0]); | |
992 | pos[1] = fNominalPos[1]; | |
993 | err[1] = TMath::Sqrt(fNominalCov[2]); | |
6d8df534 | 994 | pos[2] = fNominalPos[2]; |
995 | err[2] = TMath::Sqrt(fNominalCov[5]); | |
996 | Int_t ncontr = (err[0]>1. ? -1 : -3); | |
50ff0bcd | 997 | fCurrentVertex = 0; |
998 | fCurrentVertex = new AliESDVertex(pos,err); | |
999 | fCurrentVertex->SetNContributors(ncontr); | |
2d57349e | 1000 | |
fee9ef0d | 1001 | if(fConstraint) { |
1002 | fCurrentVertex->SetTitle("VertexerTracksWithConstraint"); | |
1003 | } else { | |
50ff0bcd | 1004 | fCurrentVertex->SetTitle("VertexerTracksNoConstraint"); |
fee9ef0d | 1005 | } |
2d57349e | 1006 | |
6d8df534 | 1007 | if(!fTrkArraySel.IsEmpty()) fTrkArraySel.Delete(); |
1008 | if(fIdSel) {delete [] fIdSel; fIdSel=NULL;} | |
1009 | if(fTrksToSkip) {delete [] fTrksToSkip; fTrksToSkip=NULL;} | |
1010 | ||
50ff0bcd | 1011 | return; |
1012 | } | |
1013 | //--------------------------------------------------------------------------- | |
fee9ef0d | 1014 | void AliVertexerTracks::VertexFinder(Int_t optUseWeights) |
1015 | { | |
2d57349e | 1016 | |
50ff0bcd | 1017 | // Get estimate of vertex position in (x,y) from tracks DCA |
1018 | ||
1019 | Double_t initPos[3]; | |
1020 | initPos[2] = 0.; | |
1021 | for(Int_t i=0;i<2;i++)initPos[i]=fNominalPos[i]; | |
6d8df534 | 1022 | Int_t nacc = (Int_t)fTrkArraySel.GetEntriesFast(); |
50ff0bcd | 1023 | Double_t aver[3]={0.,0.,0.}; |
1024 | Double_t aversq[3]={0.,0.,0.}; | |
1025 | Double_t sigmasq[3]={0.,0.,0.}; | |
1026 | Double_t sigma=0; | |
1027 | Int_t ncombi = 0; | |
6d8df534 | 1028 | AliExternalTrackParam *track1; |
1029 | AliExternalTrackParam *track2; | |
50ff0bcd | 1030 | Double_t pos[3],dir[3]; |
1031 | Double_t alpha,mindist; | |
dc3719f3 | 1032 | Double_t field=GetFieldkG(); |
2d57349e | 1033 | |
50ff0bcd | 1034 | for(Int_t i=0; i<nacc; i++){ |
6d8df534 | 1035 | track1 = (AliExternalTrackParam*)fTrkArraySel.At(i); |
50ff0bcd | 1036 | alpha=track1->GetAlpha(); |
1037 | mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; | |
1038 | track1->GetXYZAt(mindist,field,pos); | |
1039 | track1->GetPxPyPzAt(mindist,field,dir); | |
1040 | AliStrLine *line1 = new AliStrLine(pos,dir); | |
2d57349e | 1041 | |
50ff0bcd | 1042 | // AliStrLine *line1 = new AliStrLine(); |
1043 | // track1->ApproximateHelixWithLine(mindist,field,line1); | |
1044 | ||
1045 | for(Int_t j=i+1; j<nacc; j++){ | |
6d8df534 | 1046 | track2 = (AliExternalTrackParam*)fTrkArraySel.At(j); |
50ff0bcd | 1047 | alpha=track2->GetAlpha(); |
1048 | mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; | |
1049 | track2->GetXYZAt(mindist,field,pos); | |
1050 | track2->GetPxPyPzAt(mindist,field,dir); | |
1051 | AliStrLine *line2 = new AliStrLine(pos,dir); | |
1052 | // AliStrLine *line2 = new AliStrLine(); | |
1053 | // track2->ApproximateHelixWithLine(mindist,field,line2); | |
1054 | Double_t distCA=line2->GetDCA(line1); | |
fee9ef0d | 1055 | //printf("%d %d %f\n",i,j,distCA); |
1056 | if(fDCAcut<=0 || (fDCAcut>0&&distCA<fDCAcut)){ | |
50ff0bcd | 1057 | Double_t pnt1[3],pnt2[3],crosspoint[3]; |
2d57349e | 1058 | |
50ff0bcd | 1059 | if(optUseWeights<=0){ |
1060 | Int_t retcode = line2->Cross(line1,crosspoint); | |
1061 | if(retcode>=0){ | |
1062 | ncombi++; | |
1063 | for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj]; | |
1064 | for(Int_t jj=0;jj<3;jj++)aversq[jj]+=(crosspoint[jj]*crosspoint[jj]); | |
1065 | } | |
1066 | } | |
1067 | if(optUseWeights>0){ | |
1068 | Int_t retcode = line1->CrossPoints(line2,pnt1,pnt2); | |
1069 | if(retcode>=0){ | |
5c03260f | 1070 | Double_t cs, sn; |
50ff0bcd | 1071 | alpha=track1->GetAlpha(); |
1072 | cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); | |
1073 | Double_t sx1=sn*sn*track1->GetSigmaY2(), sy1=cs*cs*track1->GetSigmaY2(); | |
1074 | alpha=track2->GetAlpha(); | |
1075 | cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); | |
1076 | Double_t sx2=sn*sn*track2->GetSigmaY2(), sy2=cs*cs*track2->GetSigmaY2(); | |
1077 | Double_t sz1=track1->GetSigmaZ2(), sz2=track2->GetSigmaZ2(); | |
1078 | Double_t wx1=sx2/(sx1+sx2), wx2=1.- wx1; | |
1079 | Double_t wy1=sy2/(sy1+sy2), wy2=1.- wy1; | |
1080 | Double_t wz1=sz2/(sz1+sz2), wz2=1.- wz1; | |
1081 | crosspoint[0]=wx1*pnt1[0] + wx2*pnt2[0]; | |
1082 | crosspoint[1]=wy1*pnt1[1] + wy2*pnt2[1]; | |
1083 | crosspoint[2]=wz1*pnt1[2] + wz2*pnt2[2]; | |
1084 | ||
1085 | ncombi++; | |
1086 | for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj]; | |
1087 | for(Int_t jj=0;jj<3;jj++)aversq[jj]+=(crosspoint[jj]*crosspoint[jj]); | |
1088 | } | |
1089 | } | |
1090 | } | |
1091 | delete line2; | |
1092 | } | |
1093 | delete line1; | |
71d84967 | 1094 | } |
50ff0bcd | 1095 | if(ncombi>0){ |
1096 | for(Int_t jj=0;jj<3;jj++){ | |
1097 | initPos[jj] = aver[jj]/ncombi; | |
fee9ef0d | 1098 | //printf("%f\n",initPos[jj]); |
50ff0bcd | 1099 | aversq[jj]/=ncombi; |
1100 | sigmasq[jj]=aversq[jj]-initPos[jj]*initPos[jj]; | |
1101 | sigma+=sigmasq[jj]; | |
1102 | } | |
1103 | sigma=TMath::Sqrt(TMath::Abs(sigma)); | |
1104 | } | |
1105 | else { | |
1106 | Warning("VertexFinder","Finder did not succed"); | |
1107 | sigma=999; | |
1108 | } | |
1109 | fVert.SetXYZ(initPos); | |
1110 | fVert.SetDispersion(sigma); | |
1111 | fVert.SetNContributors(ncombi); | |
2d57349e | 1112 | } |
ec1be5d5 | 1113 | //--------------------------------------------------------------------------- |
6d8df534 | 1114 | void AliVertexerTracks::VertexFitter() |
fee9ef0d | 1115 | { |
ec1be5d5 | 1116 | // |
1117 | // The optimal estimate of the vertex position is given by a "weighted | |
0bf2e2b4 | 1118 | // average of tracks positions". |
fee9ef0d | 1119 | // Original method: V. Karimaki, CMS Note 97/0051 |
ec1be5d5 | 1120 | // |
6d8df534 | 1121 | Bool_t useConstraint = fConstraint; |
ec1be5d5 | 1122 | Double_t initPos[3]; |
0bf2e2b4 | 1123 | if(!fOnlyFitter) { |
1124 | fVert.GetXYZ(initPos); | |
1125 | } else { | |
1126 | initPos[0]=fNominalPos[0]; | |
1127 | initPos[1]=fNominalPos[1]; | |
1128 | initPos[2]=fNominalPos[2]; | |
1129 | } | |
1130 | ||
6d8df534 | 1131 | Int_t nTrksSel = (Int_t)fTrkArraySel.GetEntries(); |
1132 | if(nTrksSel==1) useConstraint=kTRUE; | |
ec1be5d5 | 1133 | if(fDebug) { |
0bf2e2b4 | 1134 | printf("--- VertexFitter(): start\n"); |
6d8df534 | 1135 | printf(" Number of tracks in array: %d\n",nTrksSel); |
ec1be5d5 | 1136 | printf(" Minimum # tracks required in fit: %d\n",fMinTracks); |
3b768a1d | 1137 | printf(" Vertex position after finder: %f,%f,%f\n",initPos[0],initPos[1],initPos[2]); |
fee9ef0d | 1138 | if(useConstraint) printf(" 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 | 1139 | } |
1140 | ||
0bf2e2b4 | 1141 | // special treatment for few-tracks fits (e.g. secondary vertices) |
6d8df534 | 1142 | Bool_t uUi3by3 = kFALSE; if(nTrksSel<5 && !useConstraint) uUi3by3 = kTRUE; |
0bf2e2b4 | 1143 | |
ec1be5d5 | 1144 | Int_t i,j,k,step=0; |
1145 | TMatrixD rv(3,1); | |
1146 | TMatrixD vV(3,3); | |
1147 | rv(0,0) = initPos[0]; | |
1148 | rv(1,0) = initPos[1]; | |
1149 | rv(2,0) = 0.; | |
1150 | Double_t xlStart,alpha; | |
6d8df534 | 1151 | Int_t nTrksUsed; |
fee9ef0d | 1152 | Double_t chi2,chi2i,chi2b; |
6d8df534 | 1153 | AliExternalTrackParam *t = 0; |
ec1be5d5 | 1154 | Int_t failed = 0; |
1155 | ||
50ff0bcd | 1156 | // initial vertex covariance matrix |
1157 | TMatrixD vVb(3,3); | |
1158 | vVb(0,0) = fNominalCov[0]; | |
1159 | vVb(0,1) = fNominalCov[1]; | |
1160 | vVb(0,2) = 0.; | |
1161 | vVb(1,0) = fNominalCov[1]; | |
1162 | vVb(1,1) = fNominalCov[2]; | |
1163 | vVb(1,2) = 0.; | |
1164 | vVb(2,0) = 0.; | |
1165 | vVb(2,1) = 0.; | |
1166 | vVb(2,2) = fNominalCov[5]; | |
1167 | TMatrixD vVbInv(TMatrixD::kInverted,vVb); | |
1168 | TMatrixD rb(3,1); | |
1169 | rb(0,0) = fNominalPos[0]; | |
1170 | rb(1,0) = fNominalPos[1]; | |
1171 | rb(2,0) = fNominalPos[2]; | |
1172 | TMatrixD vVbInvrb(vVbInv,TMatrixD::kMult,rb); | |
1173 | ||
1174 | ||
eae1677e | 1175 | // 2 steps: |
1176 | // 1st - estimate of vtx using all tracks | |
1177 | // 2nd - estimate of global chi2 | |
1178 | for(step=0; step<2; step++) { | |
ec1be5d5 | 1179 | if(fDebug) printf(" step = %d\n",step); |
1180 | chi2 = 0.; | |
6d8df534 | 1181 | nTrksUsed = 0; |
ec1be5d5 | 1182 | |
0bf2e2b4 | 1183 | if(step==1) { initPos[0]=rv(0,0); initPos[0]=rv(1,0); } |
1184 | ||
ec1be5d5 | 1185 | TMatrixD sumWiri(3,1); |
1186 | TMatrixD sumWi(3,3); | |
1187 | for(i=0; i<3; i++) { | |
1188 | sumWiri(i,0) = 0.; | |
1189 | for(j=0; j<3; j++) sumWi(j,i) = 0.; | |
1190 | } | |
1191 | ||
fee9ef0d | 1192 | // mean vertex constraint |
1193 | if(useConstraint) { | |
50ff0bcd | 1194 | for(i=0;i<3;i++) { |
1195 | sumWiri(i,0) += vVbInvrb(i,0); | |
1196 | for(k=0;k<3;k++) sumWi(i,k) += vVbInv(i,k); | |
07680cae | 1197 | } |
fee9ef0d | 1198 | // chi2 |
1199 | TMatrixD deltar = rv; deltar -= rb; | |
1200 | TMatrixD vVbInvdeltar(vVbInv,TMatrixD::kMult,deltar); | |
1201 | chi2b = deltar(0,0)*vVbInvdeltar(0,0)+ | |
1202 | deltar(1,0)*vVbInvdeltar(1,0)+ | |
1203 | deltar(2,0)*vVbInvdeltar(2,0); | |
1204 | chi2 += chi2b; | |
07680cae | 1205 | } |
1206 | ||
ec1be5d5 | 1207 | // loop on tracks |
6d8df534 | 1208 | for(k=0; k<nTrksSel; k++) { |
ec1be5d5 | 1209 | // get track from track array |
6d8df534 | 1210 | t = (AliExternalTrackParam*)fTrkArraySel.At(k); |
ec1be5d5 | 1211 | alpha = t->GetAlpha(); |
1212 | xlStart = initPos[0]*TMath::Cos(alpha)+initPos[1]*TMath::Sin(alpha); | |
fee9ef0d | 1213 | // to vtxSeed (from finder) |
6d8df534 | 1214 | t->PropagateTo(xlStart,GetFieldkG()); |
fee9ef0d | 1215 | |
ec1be5d5 | 1216 | // vector of track global coordinates |
1217 | TMatrixD ri(3,1); | |
fee9ef0d | 1218 | // covariance matrix of ri |
1219 | TMatrixD wWi(3,3); | |
1220 | ||
1221 | // get space point from track | |
0bf2e2b4 | 1222 | if(!TrackToPoint(t,ri,wWi,uUi3by3)) continue; |
fee9ef0d | 1223 | TMatrixD wWiri(wWi,TMatrixD::kMult,ri); |
ec1be5d5 | 1224 | |
1225 | // track chi2 | |
1226 | TMatrixD deltar = rv; deltar -= ri; | |
1227 | TMatrixD wWideltar(wWi,TMatrixD::kMult,deltar); | |
1228 | chi2i = deltar(0,0)*wWideltar(0,0)+ | |
1229 | deltar(1,0)*wWideltar(1,0)+ | |
1230 | deltar(2,0)*wWideltar(2,0); | |
1231 | ||
ec1be5d5 | 1232 | // add to total chi2 |
1233 | chi2 += chi2i; | |
1234 | ||
ec1be5d5 | 1235 | sumWiri += wWiri; |
1236 | sumWi += wWi; | |
1237 | ||
6d8df534 | 1238 | nTrksUsed++; |
ec1be5d5 | 1239 | } // end loop on tracks |
1240 | ||
6d8df534 | 1241 | if(nTrksUsed < fMinTracks) { |
ec1be5d5 | 1242 | failed=1; |
1243 | continue; | |
1244 | } | |
1245 | ||
1246 | Double_t determinant = sumWi.Determinant(); | |
1247 | //cerr<<" determinant: "<<determinant<<endl; | |
1248 | if(determinant < 100.) { | |
1249 | printf("det(V) = 0\n"); | |
1250 | failed=1; | |
1251 | continue; | |
1252 | } | |
1253 | ||
0bf2e2b4 | 1254 | if(step==0) { |
1255 | // inverted of weights matrix | |
1256 | TMatrixD invsumWi(TMatrixD::kInverted,sumWi); | |
1257 | vV = invsumWi; | |
1258 | // position of primary vertex | |
1259 | rv.Mult(vV,sumWiri); | |
1260 | } | |
eae1677e | 1261 | } // end loop on the 2 steps |
ec1be5d5 | 1262 | |
ec1be5d5 | 1263 | if(failed) { |
6d8df534 | 1264 | TooFewTracks(); |
ec1be5d5 | 1265 | return; |
1266 | } | |
1267 | ||
1268 | Double_t position[3]; | |
1269 | position[0] = rv(0,0); | |
1270 | position[1] = rv(1,0); | |
1271 | position[2] = rv(2,0); | |
1272 | Double_t covmatrix[6]; | |
1273 | covmatrix[0] = vV(0,0); | |
1274 | covmatrix[1] = vV(0,1); | |
1275 | covmatrix[2] = vV(1,1); | |
1276 | covmatrix[3] = vV(0,2); | |
1277 | covmatrix[4] = vV(1,2); | |
1278 | covmatrix[5] = vV(2,2); | |
1279 | ||
dc3719f3 | 1280 | // for correct chi2/ndf, count constraint as additional "track" |
6d8df534 | 1281 | if(fConstraint) nTrksUsed++; |
ec1be5d5 | 1282 | // store data in the vertex object |
6d8df534 | 1283 | fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nTrksUsed); |
ec1be5d5 | 1284 | |
1285 | if(fDebug) { | |
0bf2e2b4 | 1286 | printf(" Vertex after fit:\n"); |
ec1be5d5 | 1287 | fCurrentVertex->PrintStatus(); |
0bf2e2b4 | 1288 | printf("--- VertexFitter(): finish\n"); |
ec1be5d5 | 1289 | } |
1290 | ||
1291 | return; | |
1292 | } | |
50ff0bcd | 1293 | //---------------------------------------------------------------------------- |
6d8df534 | 1294 | AliESDVertex* AliVertexerTracks::VertexForSelectedTracks(TObjArray *trkArray, |
1295 | UShort_t *id, | |
1296 | Bool_t optUseFitter, | |
1297 | Bool_t optPropagate) | |
fee9ef0d | 1298 | { |
eae1677e | 1299 | // |
6d8df534 | 1300 | // Return vertex from tracks (AliExternalTrackParam) in array |
eae1677e | 1301 | // |
1302 | ||
fee9ef0d | 1303 | SetConstraintOff(); |
1304 | ||
50ff0bcd | 1305 | // get tracks and propagate them to initial vertex position |
6d8df534 | 1306 | fIdSel = new UShort_t[(Int_t)trkArray->GetEntriesFast()]; |
1307 | Int_t nTrksSel = PrepareTracks(*trkArray,id,0); | |
1308 | if(nTrksSel < TMath::Max(2,fMinTracks)) { | |
1309 | TooFewTracks(); | |
fee9ef0d | 1310 | return fCurrentVertex; |
50ff0bcd | 1311 | } |
1312 | ||
6d8df534 | 1313 | // vertex finder |
fee9ef0d | 1314 | switch (fAlgo) { |
1315 | case 1: StrLinVertexFinderMinDist(1); break; | |
1316 | case 2: StrLinVertexFinderMinDist(0); break; | |
1317 | case 3: HelixVertexFinder(); break; | |
1318 | case 4: VertexFinder(1); break; | |
1319 | case 5: VertexFinder(0); break; | |
1320 | default: printf("Wrong algorithm\n"); break; | |
1321 | } | |
fee9ef0d | 1322 | if(fDebug) printf(" Vertex finding completed\n"); |
1323 | ||
1324 | // vertex fitter | |
6d8df534 | 1325 | if(optUseFitter) { |
1326 | VertexFitter(); | |
1327 | } else { | |
fee9ef0d | 1328 | Double_t position[3]={fVert.GetXv(),fVert.GetYv(),fVert.GetZv()}; |
146c29df | 1329 | Double_t covmatrix[6]; |
1330 | fVert.GetCovMatrix(covmatrix); | |
fee9ef0d | 1331 | Double_t chi2=99999.; |
6d8df534 | 1332 | Int_t nTrksUsed=fVert.GetNContributors(); |
1333 | fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nTrksUsed); | |
fee9ef0d | 1334 | } |
1335 | fCurrentVertex->SetDispersion(fVert.GetDispersion()); | |
1336 | ||
1337 | ||
1338 | // set indices of used tracks and propagate track to found vertex | |
50ff0bcd | 1339 | UShort_t *indices = 0; |
6d8df534 | 1340 | Double_t d0z0[2],covd0z0[3]; |
1341 | AliExternalTrackParam *t = 0; | |
fee9ef0d | 1342 | if(fCurrentVertex->GetNContributors()>0) { |
1343 | indices = new UShort_t[fCurrentVertex->GetNContributors()]; | |
6d8df534 | 1344 | for(Int_t jj=0; jj<(Int_t)fTrkArraySel.GetEntriesFast(); jj++) { |
1345 | indices[jj] = fIdSel[jj]; | |
1346 | t = (AliExternalTrackParam*)fTrkArraySel.At(jj); | |
1347 | if(optPropagate && optUseFitter) { | |
fee9ef0d | 1348 | if(TMath::Sqrt(fCurrentVertex->GetXv()*fCurrentVertex->GetXv()+fCurrentVertex->GetYv()*fCurrentVertex->GetYv())<3.) { |
6d8df534 | 1349 | t->PropagateToDCA(fCurrentVertex,GetFieldkG(),100.,d0z0,covd0z0); |
fee9ef0d | 1350 | if(fDebug) printf("Track %d propagated to found vertex\n",jj); |
6d8df534 | 1351 | } else { |
fee9ef0d | 1352 | AliWarning("Found vertex outside beam pipe!"); |
1353 | } | |
1354 | } | |
50ff0bcd | 1355 | } |
fee9ef0d | 1356 | fCurrentVertex->SetIndices(fCurrentVertex->GetNContributors(),indices); |
50ff0bcd | 1357 | } |
6d8df534 | 1358 | |
1359 | // clean up | |
1360 | delete [] indices; indices=NULL; | |
1361 | delete [] fIdSel; fIdSel=NULL; | |
1362 | fTrkArraySel.Delete(); | |
50ff0bcd | 1363 | |
fee9ef0d | 1364 | return fCurrentVertex; |
eae1677e | 1365 | } |
50ff0bcd | 1366 | //---------------------------------------------------------------------------- |
6d8df534 | 1367 | AliESDVertex* AliVertexerTracks::VertexForSelectedESDTracks(TObjArray *trkArray, |
1368 | Bool_t optUseFitter, | |
1369 | Bool_t optPropagate) | |
fee9ef0d | 1370 | { |
50ff0bcd | 1371 | // |
6d8df534 | 1372 | // Return vertex from array of ESD tracks |
50ff0bcd | 1373 | // |
5834e9a1 | 1374 | |
6d8df534 | 1375 | Int_t nTrks = (Int_t)trkArray->GetEntriesFast(); |
1376 | UShort_t *id = new UShort_t[nTrks]; | |
1377 | ||
1378 | AliESDtrack *esdt = 0; | |
50ff0bcd | 1379 | for(Int_t i=0; i<nTrks; i++){ |
6d8df534 | 1380 | esdt = (AliESDtrack*)trkArray->At(i); |
1381 | id[i] = (UShort_t)esdt->GetID(); | |
50ff0bcd | 1382 | } |
1383 | ||
6d8df534 | 1384 | VertexForSelectedTracks(trkArray,id,optUseFitter,optPropagate); |
1385 | ||
1386 | delete [] id; id=NULL; | |
1387 | ||
1388 | return fCurrentVertex; | |
50ff0bcd | 1389 | } |
1390 | //-------------------------------------------------------------------------- |