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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 | //----------------------------------------------------------------- | |
17 | // Implementation of the vertexer from ESD tracks | |
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: | |
25 | // F.Prino, Torino, prino@to.infn.it | |
26 | //----------------------------------------------------------------- | |
27 | ||
28 | //---- Root headers -------- | |
29 | #include <TTree.h> | |
ec1be5d5 | 30 | #include <TMatrixD.h> |
2d57349e | 31 | //---- AliRoot headers ----- |
32 | #include "AliStrLine.h" | |
33 | #include "AliVertexerTracks.h" | |
c5e3e5d1 | 34 | #include "AliESD.h" |
2d57349e | 35 | #include "AliESDtrack.h" |
36 | ||
37 | ClassImp(AliVertexerTracks) | |
38 | ||
39 | ||
40 | //---------------------------------------------------------------------------- | |
41 | AliVertexerTracks::AliVertexerTracks(): | |
07680cae | 42 | TObject(), |
43 | fVert(), | |
44 | fCurrentVertex(0), | |
dc3719f3 | 45 | fFieldkG(-999.), |
fee9ef0d | 46 | fConstraint(kFALSE), |
47 | fOnlyFitter(kFALSE), | |
0c69be49 | 48 | fMinTracks(1), |
fe12e09c | 49 | fMinITSClusters(5), |
07680cae | 50 | fTrkArray(), |
51 | fTrksToSkip(0), | |
52 | fNTrksToSkip(0), | |
53 | fDCAcut(0), | |
54 | fAlgo(1), | |
fe12e09c | 55 | fNSigma(3), |
fee9ef0d | 56 | fMaxd0z0(0.5), |
50ff0bcd | 57 | fITSin(kTRUE), |
58 | fITSrefit(kTRUE), | |
07680cae | 59 | fDebug(0) |
2d57349e | 60 | { |
61 | // | |
62 | // Default constructor | |
63 | // | |
64 | SetVtxStart(); | |
07680cae | 65 | SetVtxStartSigma(); |
2d57349e | 66 | SetMinTracks(); |
07680cae | 67 | SetMinITSClusters(); |
68 | SetNSigmad0(); | |
fee9ef0d | 69 | SetMaxd0z0(); |
2d57349e | 70 | } |
dc3719f3 | 71 | //---------------------------------------------------------------------------- |
72 | AliVertexerTracks::AliVertexerTracks(Double_t fieldkG): | |
07680cae | 73 | TObject(), |
74 | fVert(), | |
75 | fCurrentVertex(0), | |
dc3719f3 | 76 | fFieldkG(-999.), |
fee9ef0d | 77 | fConstraint(kFALSE), |
78 | fOnlyFitter(kFALSE), | |
0c69be49 | 79 | fMinTracks(1), |
fe12e09c | 80 | fMinITSClusters(5), |
07680cae | 81 | fTrkArray(), |
82 | fTrksToSkip(0), | |
83 | fNTrksToSkip(0), | |
84 | fDCAcut(0), | |
85 | fAlgo(1), | |
fe12e09c | 86 | fNSigma(3), |
fee9ef0d | 87 | fMaxd0z0(0.5), |
50ff0bcd | 88 | fITSin(kTRUE), |
89 | fITSrefit(kTRUE), | |
07680cae | 90 | fDebug(0) |
2d57349e | 91 | { |
92 | // | |
93 | // Standard constructor | |
94 | // | |
dc3719f3 | 95 | SetVtxStart(); |
07680cae | 96 | SetVtxStartSigma(); |
2d57349e | 97 | SetMinTracks(); |
07680cae | 98 | SetMinITSClusters(); |
99 | SetNSigmad0(); | |
dc3719f3 | 100 | SetMaxd0z0(); |
101 | SetFieldkG(fieldkG); | |
2d57349e | 102 | } |
103 | //----------------------------------------------------------------------------- | |
fee9ef0d | 104 | AliVertexerTracks::~AliVertexerTracks() |
105 | { | |
2d57349e | 106 | // Default Destructor |
eae1677e | 107 | // The objects pointed by the following pointer are not owned |
2d57349e | 108 | // by this class and are not deleted |
ec1be5d5 | 109 | fCurrentVertex = 0; |
07680cae | 110 | delete[] fTrksToSkip; |
ec1be5d5 | 111 | } |
c5e3e5d1 | 112 | //---------------------------------------------------------------------------- |
ec1be5d5 | 113 | AliESDVertex* AliVertexerTracks::FindPrimaryVertex(const AliESD *esdEvent) |
114 | { | |
c5e3e5d1 | 115 | // |
ec1be5d5 | 116 | // Primary vertex for current ESD event |
eae1677e | 117 | // (Two iterations: |
fee9ef0d | 118 | // 1st with 5*fNSigma*sigma cut w.r.t. to initial vertex |
119 | // + cut on sqrt(d0d0+z0z0) if fConstraint=kFALSE | |
120 | // 2nd with fNSigma*sigma cut w.r.t. to vertex found in 1st iteration) | |
318aecb9 | 121 | // All ESD tracks with inside the beam pipe are then propagated to found vertex |
07680cae | 122 | // |
123 | fCurrentVertex = 0; | |
124 | ||
dc3719f3 | 125 | // accept 1-track case only if constraint is available |
126 | if(!fConstraint && fMinTracks==1) fMinTracks=2; | |
127 | ||
128 | // get Bz from ESD | |
129 | // SetFieldkG(esdEvent->GetMagneticField()); | |
130 | ||
fee9ef0d | 131 | // read tracks from ESD |
50ff0bcd | 132 | Int_t nTrksTot = (Int_t)esdEvent->GetNumberOfTracks(); |
80d36431 | 133 | if (nTrksTot<=0) { |
134 | if(fDebug) printf("TooFewTracks\n"); | |
135 | TooFewTracks(esdEvent); | |
136 | return fCurrentVertex; | |
137 | } | |
713e5fbf | 138 | |
07680cae | 139 | TTree *trkTree = new TTree("TreeT","tracks"); |
140 | AliESDtrack *esdTrack = 0; | |
141 | trkTree->Branch("tracks","AliESDtrack",&esdTrack); | |
142 | ||
eae1677e | 143 | Bool_t skipThis; |
50ff0bcd | 144 | for(Int_t i=0; i<nTrksTot; i++) { |
fee9ef0d | 145 | AliESDtrack *et = esdEvent->GetTrack(i); |
146 | esdTrack = new AliESDtrack(*et); | |
eae1677e | 147 | // check tracks to skip |
148 | skipThis = kFALSE; | |
149 | for(Int_t j=0; j<fNTrksToSkip; j++) { | |
fee9ef0d | 150 | if(et->GetID()==fTrksToSkip[j]) { |
eae1677e | 151 | if(fDebug) printf("skipping track: %d\n",i); |
152 | skipThis = kTRUE; | |
153 | } | |
154 | } | |
50ff0bcd | 155 | if(skipThis) {delete esdTrack;continue;} |
156 | if(fITSin) { | |
157 | if(!(esdTrack->GetStatus()&AliESDtrack::kITSin)) {delete esdTrack;continue;} | |
158 | if(fITSrefit && !(esdTrack->GetStatus()&AliESDtrack::kITSrefit)) {delete esdTrack;continue;} | |
159 | Int_t nclus=esdTrack->GetNcls(0); // check number of clusters in ITS | |
160 | if(nclus<fMinITSClusters) {delete esdTrack;continue;} | |
161 | } | |
07680cae | 162 | trkTree->Fill(); |
5834e9a1 | 163 | delete esdTrack; |
07680cae | 164 | } |
fee9ef0d | 165 | |
166 | // If fConstraint=kFALSE | |
167 | // run VertexFinder(1) to get rough estimate of initVertex (x,y) | |
168 | if(!fConstraint) { | |
169 | // fill fTrkArray, for VertexFinder() | |
170 | if(!fTrkArray.IsEmpty()) fTrkArray.Delete(); | |
171 | PrepareTracks(*trkTree,0); | |
172 | Double_t cutsave = fDCAcut; fDCAcut = 0.1; // 1 mm | |
173 | VertexFinder(1); // using weights, cutting dca < fDCAcut | |
174 | fDCAcut = cutsave; | |
5834e9a1 | 175 | fTrkArray.Delete(); |
fee9ef0d | 176 | if(fVert.GetNContributors()>0) { |
177 | fVert.GetXYZ(fNominalPos); | |
178 | fNominalPos[0] = fVert.GetXv(); | |
179 | fNominalPos[1] = fVert.GetYv(); | |
180 | fNominalPos[2] = fVert.GetZv(); | |
181 | if(fDebug) printf("No mean vertex: VertexFinder gives (%f, %f, %f)\n",fNominalPos[0],fNominalPos[1],fNominalPos[2]); | |
182 | } else { | |
183 | fNominalPos[0] = 0.; | |
184 | fNominalPos[1] = 0.; | |
185 | fNominalPos[2] = 0.; | |
186 | if(fDebug) printf("No mean vertex and VertexFinder failed\n"); | |
0c69be49 | 187 | } |
07680cae | 188 | } |
fee9ef0d | 189 | |
190 | // TWO ITERATIONS: | |
191 | // | |
192 | // ITERATION 1 | |
193 | // propagate tracks to fNominalPos vertex | |
194 | // preselect them: | |
195 | // if(constraint) reject for |d0|>5*fNSigma*sigma w.r.t. fNominal... vertex | |
196 | // else reject for |d0|\oplus|z0| > 5 mm w.r.t. fNominal... vertex | |
07680cae | 197 | // ITERATION 2 |
198 | // propagate tracks to best between initVertex and fCurrentVertex | |
199 | // preselect tracks (reject for |d0|>fNSigma*sigma w.r.t. best | |
200 | // between initVertex and fCurrentVertex) | |
fee9ef0d | 201 | for(Int_t iter=0; iter<2; iter++) { |
202 | if(fOnlyFitter && iter==0) continue; | |
203 | Int_t nTrksPrep = PrepareTracks(*trkTree,iter+1); | |
204 | if(fDebug) printf(" tracks prepared - iteration %d: %d\n",iter+1,nTrksPrep); | |
205 | if(nTrksPrep < fMinTracks) { | |
206 | if(fDebug) printf("TooFewTracks\n"); | |
207 | TooFewTracks(esdEvent); | |
208 | if(fDebug) fCurrentVertex->PrintStatus(); | |
209 | fTrkArray.Delete(); | |
210 | delete trkTree; | |
211 | return fCurrentVertex; | |
212 | } | |
07680cae | 213 | |
fee9ef0d | 214 | // vertex finder |
215 | if(!fOnlyFitter) { | |
216 | if(nTrksPrep==1){ | |
217 | if(fDebug) printf("Just one track\n"); | |
218 | OneTrackVertFinder(); | |
219 | }else{ | |
220 | switch (fAlgo) { | |
221 | case 1: StrLinVertexFinderMinDist(1); break; | |
222 | case 2: StrLinVertexFinderMinDist(0); break; | |
223 | case 3: HelixVertexFinder(); break; | |
224 | case 4: VertexFinder(1); break; | |
225 | case 5: VertexFinder(0); break; | |
226 | default: printf("Wrong algorithm\n"); break; | |
227 | } | |
228 | } | |
229 | if(fDebug) printf(" Vertex finding completed\n"); | |
0c69be49 | 230 | } |
07680cae | 231 | |
fee9ef0d | 232 | // vertex fitter |
233 | VertexFitter(fConstraint); | |
234 | if(fDebug) printf(" Vertex fit completed\n"); | |
235 | if(iter==0) fTrkArray.Delete(); | |
236 | } // end loop on the two iterations | |
07680cae | 237 | |
eae1677e | 238 | |
fee9ef0d | 239 | // take true pos from SPD vertex in ESD and write it in tracks' vertex |
07680cae | 240 | Double_t tp[3]; |
241 | esdEvent->GetVertex()->GetTruePos(tp); | |
242 | fCurrentVertex->SetTruePos(tp); | |
eae1677e | 243 | |
fee9ef0d | 244 | if(fConstraint) { |
245 | if(fOnlyFitter) { | |
246 | fCurrentVertex->SetTitle("VertexerTracksWithConstraintOnlyFitter"); | |
247 | } else { | |
248 | fCurrentVertex->SetTitle("VertexerTracksWithConstraint"); | |
318aecb9 | 249 | } |
250 | } else { | |
fee9ef0d | 251 | fCurrentVertex->SetTitle("VertexerTracksNoConstraint"); |
318aecb9 | 252 | } |
50ff0bcd | 253 | |
fee9ef0d | 254 | |
50ff0bcd | 255 | // set indices of used tracks |
256 | UShort_t *indices = 0; | |
257 | AliESDtrack *ett = 0; | |
258 | if(fCurrentVertex->GetNContributors()>0) { | |
259 | indices = new UShort_t[fCurrentVertex->GetNContributors()]; | |
260 | for(Int_t jj=0;jj<(Int_t)fTrkArray.GetEntriesFast();jj++) { | |
261 | ett = (AliESDtrack*)fTrkArray.At(jj); | |
262 | indices[jj] = (UShort_t)ett->GetID(); | |
263 | } | |
264 | fCurrentVertex->SetIndices(fCurrentVertex->GetNContributors(),indices); | |
265 | } | |
266 | delete [] indices; | |
fee9ef0d | 267 | |
268 | delete trkTree; | |
269 | ||
50ff0bcd | 270 | fTrkArray.Delete(); |
271 | ||
272 | if(fTrksToSkip) delete [] fTrksToSkip; | |
273 | ||
274 | ||
275 | if(fDebug) fCurrentVertex->PrintStatus(); | |
276 | if(fDebug) fCurrentVertex->PrintIndices(); | |
fee9ef0d | 277 | |
278 | ||
07680cae | 279 | return fCurrentVertex; |
280 | } | |
50ff0bcd | 281 | //------------------------------------------------------------------------ |
fee9ef0d | 282 | Double_t AliVertexerTracks::GetDeterminant3X3(Double_t matr[][3]) |
283 | { | |
50ff0bcd | 284 | // |
285 | 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]; | |
286 | return det; | |
287 | } | |
288 | //------------------------------------------------------------------------- | |
fee9ef0d | 289 | void AliVertexerTracks::GetStrLinDerivMatrix(Double_t *p0,Double_t *p1,Double_t (*m)[3],Double_t *d) |
290 | { | |
50ff0bcd | 291 | // |
292 | Double_t x12=p0[0]-p1[0]; | |
293 | Double_t y12=p0[1]-p1[1]; | |
294 | Double_t z12=p0[2]-p1[2]; | |
295 | Double_t kk=x12*x12+y12*y12+z12*z12; | |
296 | m[0][0]=2-2/kk*x12*x12; | |
297 | m[0][1]=-2/kk*x12*y12; | |
298 | m[0][2]=-2/kk*x12*z12; | |
299 | m[1][0]=-2/kk*x12*y12; | |
300 | m[1][1]=2-2/kk*y12*y12; | |
301 | m[1][2]=-2/kk*y12*z12; | |
302 | m[2][0]=-2/kk*x12*z12; | |
303 | m[2][1]=-2*y12*z12; | |
304 | m[2][2]=2-2/kk*z12*z12; | |
305 | d[0]=2*p0[0]-2/kk*p0[0]*x12*x12-2/kk*p0[2]*x12*z12-2/kk*p0[1]*x12*y12; | |
306 | d[1]=2*p0[1]-2/kk*p0[1]*y12*y12-2/kk*p0[0]*x12*y12-2/kk*p0[2]*z12*y12; | |
307 | d[2]=2*p0[2]-2/kk*p0[2]*z12*z12-2/kk*p0[0]*x12*z12-2/kk*p0[1]*z12*y12; | |
c5e3e5d1 | 308 | |
50ff0bcd | 309 | } |
310 | //-------------------------------------------------------------------------- | |
fee9ef0d | 311 | void AliVertexerTracks::GetStrLinDerivMatrix(Double_t *p0,Double_t *p1,Double_t *sigmasq,Double_t (*m)[3],Double_t *d) |
312 | { | |
50ff0bcd | 313 | // |
314 | Double_t x12=p1[0]-p0[0]; | |
315 | Double_t y12=p1[1]-p0[1]; | |
316 | Double_t z12=p1[2]-p0[2]; | |
c5e3e5d1 | 317 | |
50ff0bcd | 318 | Double_t den= x12*x12*sigmasq[1]*sigmasq[2]+y12*y12*sigmasq[0]*sigmasq[2]+z12*z12*sigmasq[0]*sigmasq[1]; |
c5e3e5d1 | 319 | |
50ff0bcd | 320 | Double_t kk= 2*(x12*x12/sigmasq[0]+y12*y12/sigmasq[1]+z12*z12/sigmasq[2]); |
c5e3e5d1 | 321 | |
50ff0bcd | 322 | Double_t cc[3]; |
323 | cc[0]=-x12/sigmasq[0]; | |
324 | cc[1]=-y12/sigmasq[1]; | |
325 | cc[2]=-z12/sigmasq[2]; | |
ec1be5d5 | 326 | |
50ff0bcd | 327 | 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 | 328 | |
50ff0bcd | 329 | Double_t ss= -p0[0]*cc[0]-p0[1]*cc[1]-p0[2]*cc[2]; |
2d57349e | 330 | |
50ff0bcd | 331 | Double_t aa[3]; |
332 | aa[0]=x12*sigmasq[1]*sigmasq[2]/den; | |
333 | aa[1]=y12*sigmasq[0]*sigmasq[2]/den; | |
334 | aa[2]=z12*sigmasq[0]*sigmasq[1]/den; | |
2d57349e | 335 | |
50ff0bcd | 336 | m[0][0]=aa[0]*(aa[0]*kk+2*cc[0])+2*cc[0]*aa[0]+2/sigmasq[0]; |
337 | m[0][1]=aa[1]*(aa[0]*kk+2*cc[0])+2*cc[1]*aa[0]; | |
338 | m[0][2]=aa[2]*(aa[0]*kk+2*cc[0])+2*cc[2]*aa[0]; | |
2d57349e | 339 | |
50ff0bcd | 340 | m[1][0]=aa[0]*(aa[1]*kk+2*cc[1])+2*cc[0]*aa[1]; |
341 | m[1][1]=aa[1]*(aa[1]*kk+2*cc[1])+2*cc[1]*aa[1]+2/sigmasq[1]; | |
342 | m[1][2]=aa[2]*(aa[1]*kk+2*cc[1])+2*cc[2]*aa[1]; | |
2d57349e | 343 | |
50ff0bcd | 344 | m[2][0]=aa[0]*(aa[2]*kk+2*cc[2])+2*cc[0]*aa[2]; |
345 | m[2][1]=aa[1]*(aa[2]*kk+2*cc[2])+2*cc[1]*aa[2]; | |
346 | m[2][2]=aa[2]*(aa[2]*kk+2*cc[2])+2*cc[2]*aa[2]+2/sigmasq[2]; | |
08df6187 | 347 | |
50ff0bcd | 348 | d[0]=-ww*(aa[0]*kk+2*cc[0])-2*ss*aa[0]+2*p0[0]/sigmasq[0]; |
349 | d[1]=-ww*(aa[1]*kk+2*cc[1])-2*ss*aa[1]+2*p0[1]/sigmasq[1]; | |
350 | d[2]=-ww*(aa[2]*kk+2*cc[2])-2*ss*aa[2]+2*p0[2]/sigmasq[2]; | |
2d57349e | 351 | |
2d57349e | 352 | } |
50ff0bcd | 353 | //-------------------------------------------------------------------------- |
fee9ef0d | 354 | Double_t AliVertexerTracks::GetStrLinMinDist(Double_t *p0,Double_t *p1,Double_t *x0) |
355 | { | |
50ff0bcd | 356 | // |
357 | Double_t x12=p0[0]-p1[0]; | |
358 | Double_t y12=p0[1]-p1[1]; | |
359 | Double_t z12=p0[2]-p1[2]; | |
360 | Double_t x10=p0[0]-x0[0]; | |
361 | Double_t y10=p0[1]-x0[1]; | |
362 | Double_t z10=p0[2]-x0[2]; | |
363 | 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 | 364 | } |
365 | //--------------------------------------------------------------------------- | |
fee9ef0d | 366 | void AliVertexerTracks::OneTrackVertFinder() |
367 | { | |
0c69be49 | 368 | // find vertex for events with 1 track, using DCA to nominal beam axis |
369 | if(fDebug) printf("Number of prepared tracks =%d - Call OneTrackVertFinder",fTrkArray.GetEntries()); | |
370 | AliESDtrack *track1; | |
371 | track1 = (AliESDtrack*)fTrkArray.At(0); | |
dc3719f3 | 372 | Double_t field=GetFieldkG(); |
0c69be49 | 373 | Double_t alpha=track1->GetAlpha(); |
374 | Double_t mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; | |
375 | Double_t pos[3],dir[3]; | |
376 | track1->GetXYZAt(mindist,field,pos); | |
377 | track1->GetPxPyPzAt(mindist,field,dir); | |
378 | AliStrLine *line1 = new AliStrLine(pos,dir); | |
379 | Double_t p1[3]={fNominalPos[0],fNominalPos[1],0.}; | |
380 | Double_t p2[3]={fNominalPos[0],fNominalPos[1],10.}; | |
381 | AliStrLine *zeta=new AliStrLine(p1,p2,kTRUE); | |
382 | Double_t crosspoint[3]={0.,0.,0.}; | |
383 | Double_t sigma=999.; | |
384 | Int_t nContrib=-1; | |
385 | Int_t retcode = zeta->Cross(line1,crosspoint); | |
386 | if(retcode>=0){ | |
387 | sigma=line1->GetDistFromPoint(crosspoint); | |
388 | nContrib=1; | |
389 | } | |
390 | delete zeta; | |
391 | delete line1; | |
392 | fVert.SetXYZ(crosspoint); | |
393 | fVert.SetDispersion(sigma); | |
394 | fVert.SetNContributors(nContrib); | |
395 | } | |
396 | //--------------------------------------------------------------------------- | |
fee9ef0d | 397 | void AliVertexerTracks::HelixVertexFinder() |
398 | { | |
2d57349e | 399 | // Get estimate of vertex position in (x,y) from tracks DCA |
400 | ||
401 | ||
402 | Double_t initPos[3]; | |
403 | initPos[2] = 0.; | |
404 | for(Int_t i=0;i<2;i++)initPos[i]=fNominalPos[i]; | |
dc3719f3 | 405 | Double_t field=GetFieldkG(); |
2d57349e | 406 | |
407 | Int_t nacc = (Int_t)fTrkArray.GetEntriesFast(); | |
408 | ||
409 | Double_t aver[3]={0.,0.,0.}; | |
410 | Double_t averquad[3]={0.,0.,0.}; | |
411 | Double_t sigmaquad[3]={0.,0.,0.}; | |
412 | Double_t sigma=0; | |
413 | Int_t ncombi = 0; | |
414 | AliESDtrack *track1; | |
415 | AliESDtrack *track2; | |
416 | Double_t distCA; | |
417 | Double_t x, par[5]; | |
418 | Double_t alpha, cs, sn; | |
419 | Double_t crosspoint[3]; | |
420 | for(Int_t i=0; i<nacc; i++){ | |
421 | track1 = (AliESDtrack*)fTrkArray.At(i); | |
422 | ||
423 | ||
424 | for(Int_t j=i+1; j<nacc; j++){ | |
425 | track2 = (AliESDtrack*)fTrkArray.At(j); | |
426 | ||
427 | distCA=track2->PropagateToDCA(track1,field); | |
2d57349e | 428 | if(fDCAcut<=0 ||(fDCAcut>0&&distCA<fDCAcut)){ |
429 | track1->GetExternalParameters(x,par); | |
430 | alpha=track1->GetAlpha(); | |
431 | cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); | |
432 | Double_t x1=x*cs - par[0]*sn; | |
433 | Double_t y1=x*sn + par[0]*cs; | |
434 | Double_t z1=par[1]; | |
435 | Double_t sx1=sn*sn*track1->GetSigmaY2(), sy1=cs*cs*track1->GetSigmaY2(); | |
436 | track2->GetExternalParameters(x,par); | |
437 | alpha=track2->GetAlpha(); | |
438 | cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); | |
439 | Double_t x2=x*cs - par[0]*sn; | |
440 | Double_t y2=x*sn + par[0]*cs; | |
441 | Double_t z2=par[1]; | |
442 | Double_t sx2=sn*sn*track2->GetSigmaY2(), sy2=cs*cs*track2->GetSigmaY2(); | |
443 | Double_t sz1=track1->GetSigmaZ2(), sz2=track2->GetSigmaZ2(); | |
444 | Double_t wx1=sx2/(sx1+sx2), wx2=1.- wx1; | |
445 | Double_t wy1=sy2/(sy1+sy2), wy2=1.- wy1; | |
446 | Double_t wz1=sz2/(sz1+sz2), wz2=1.- wz1; | |
447 | crosspoint[0]=wx1*x1 + wx2*x2; | |
448 | crosspoint[1]=wy1*y1 + wy2*y2; | |
449 | crosspoint[2]=wz1*z1 + wz2*z2; | |
450 | ||
451 | ncombi++; | |
452 | for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj]; | |
453 | for(Int_t jj=0;jj<3;jj++)averquad[jj]+=(crosspoint[jj]*crosspoint[jj]); | |
454 | } | |
455 | } | |
456 | ||
457 | } | |
458 | if(ncombi>0){ | |
459 | for(Int_t jj=0;jj<3;jj++){ | |
460 | initPos[jj] = aver[jj]/ncombi; | |
461 | averquad[jj]/=ncombi; | |
462 | sigmaquad[jj]=averquad[jj]-initPos[jj]*initPos[jj]; | |
463 | sigma+=sigmaquad[jj]; | |
464 | } | |
465 | sigma=TMath::Sqrt(TMath::Abs(sigma)); | |
466 | } | |
467 | else { | |
468 | Warning("HelixVertexFinder","Finder did not succed"); | |
469 | sigma=999; | |
470 | } | |
471 | fVert.SetXYZ(initPos); | |
472 | fVert.SetDispersion(sigma); | |
473 | fVert.SetNContributors(ncombi); | |
474 | } | |
50ff0bcd | 475 | //---------------------------------------------------------------------------- |
fee9ef0d | 476 | Int_t AliVertexerTracks::PrepareTracks(TTree &trkTree,Int_t optImpParCut) |
477 | { | |
50ff0bcd | 478 | // |
479 | // Propagate tracks to initial vertex position and store them in a TObjArray | |
480 | // | |
fee9ef0d | 481 | Double_t maxd0rphi; |
482 | Double_t maxd0z0 = fMaxd0z0; // default is 5 mm | |
50ff0bcd | 483 | Int_t nTrks = 0; |
484 | Double_t sigmaCurr[3]; | |
fee9ef0d | 485 | Double_t normdistx,normdisty; |
50ff0bcd | 486 | Float_t d0z0[2],covd0z0[3]; |
487 | Double_t sigma; | |
dc3719f3 | 488 | Double_t field=GetFieldkG(); |
50ff0bcd | 489 | |
490 | AliESDVertex *initVertex = new AliESDVertex(fNominalPos,fNominalCov,1,1); | |
491 | ||
492 | Int_t nEntries = (Int_t)trkTree.GetEntries(); | |
493 | if(!fTrkArray.IsEmpty()) fTrkArray.Delete(); | |
494 | ||
495 | if(fDebug) { | |
496 | printf(" PrepareTracks()\n"); | |
497 | } | |
498 | ||
499 | for(Int_t i=0; i<nEntries; i++) { | |
500 | AliESDtrack *track = new AliESDtrack; | |
501 | trkTree.SetBranchAddress("tracks",&track); | |
502 | trkTree.GetEvent(i); | |
503 | ||
504 | // propagate track to vertex | |
fee9ef0d | 505 | if(optImpParCut<=1 || fOnlyFitter) { // optImpParCut==1 or 0 |
50ff0bcd | 506 | track->RelateToVertex(initVertex,field,100.); |
fee9ef0d | 507 | } else { // optImpParCut==2 |
50ff0bcd | 508 | fCurrentVertex->GetSigmaXYZ(sigmaCurr); |
fee9ef0d | 509 | normdistx = TMath::Abs(fCurrentVertex->GetXv()-fNominalPos[0])/TMath::Sqrt(sigmaCurr[0]*sigmaCurr[0]+fNominalCov[0]); |
80d36431 | 510 | normdisty = TMath::Abs(fCurrentVertex->GetYv()-fNominalPos[1])/TMath::Sqrt(sigmaCurr[1]*sigmaCurr[1]+fNominalCov[2]); |
fee9ef0d | 511 | if(normdistx < 3. && normdisty < 3. && |
80d36431 | 512 | (sigmaCurr[0]+sigmaCurr[1])<(TMath::Sqrt(fNominalCov[0])+TMath::Sqrt(fNominalCov[2]))) { |
50ff0bcd | 513 | track->RelateToVertex(fCurrentVertex,field,100.); |
514 | } else { | |
515 | track->RelateToVertex(initVertex,field,100.); | |
516 | } | |
517 | } | |
518 | ||
50ff0bcd | 519 | track->GetImpactParameters(d0z0,covd0z0); |
520 | sigma = TMath::Sqrt(covd0z0[0]); | |
521 | maxd0rphi = fNSigma*sigma; | |
fee9ef0d | 522 | if(optImpParCut==1) maxd0rphi *= 5.; |
523 | ||
524 | ||
50ff0bcd | 525 | |
fee9ef0d | 526 | if(fDebug) printf("trk %d; lab %d; |d0| = %f; d0 cut = %f; |z0| = %f; |d0|oplus|z0| = %f; d0z0 cut = %f\n",i,track->GetLabel(),TMath::Abs(d0z0[0]),maxd0rphi,TMath::Abs(d0z0[1]),TMath::Sqrt(d0z0[0]*d0z0[0]+d0z0[1]*d0z0[1]),maxd0z0); |
527 | ||
80d36431 | 528 | // during iterations 1 and 2, if fConstraint=kFALSE, |
fee9ef0d | 529 | // select tracks with d0oplusz0 < maxd0z0 |
80d36431 | 530 | if(optImpParCut>=1 && !fConstraint && nEntries>=3 && |
fee9ef0d | 531 | fVert.GetNContributors()>0) { |
532 | if(TMath::Sqrt(d0z0[0]*d0z0[0]+d0z0[1]*d0z0[1]) > maxd0z0) { | |
533 | if(fDebug) printf(" rejected\n"); | |
534 | delete track; continue; | |
535 | } | |
536 | } | |
537 | ||
538 | // select tracks with d0rphi < maxd0rphi | |
539 | if(optImpParCut>0 && TMath::Abs(d0z0[0]) > maxd0rphi) { | |
50ff0bcd | 540 | if(fDebug) printf(" rejected\n"); |
541 | delete track; continue; | |
542 | } | |
543 | ||
544 | fTrkArray.AddLast(track); | |
545 | nTrks++; | |
546 | } | |
547 | ||
548 | delete initVertex; | |
549 | ||
550 | return nTrks; | |
551 | } | |
552 | //--------------------------------------------------------------------------- | |
fee9ef0d | 553 | AliESDVertex* AliVertexerTracks::RemoveTracksFromVertex(AliESDVertex *inVtx, |
554 | TTree *trksTree, | |
555 | Float_t *diamondxy) | |
556 | { | |
50ff0bcd | 557 | // |
fee9ef0d | 558 | // Removes tracks in trksTree from fit of inVtx |
50ff0bcd | 559 | // |
fee9ef0d | 560 | |
561 | if(!strstr(inVtx->GetTitle(),"VertexerTracksWithConstraintOnlyFitter")) | |
562 | printf("WARNING: result of tracks' removal will be only approximately correct\n"); | |
563 | ||
564 | TMatrixD rv(3,1); | |
565 | rv(0,0) = inVtx->GetXv(); | |
566 | rv(1,0) = inVtx->GetYv(); | |
567 | rv(2,0) = inVtx->GetZv(); | |
568 | TMatrixD vV(3,3); | |
569 | Double_t cov[6]; | |
570 | inVtx->GetCovMatrix(cov); | |
571 | vV(0,0) = cov[0]; | |
572 | vV(0,1) = cov[1]; vV(1,0) = cov[1]; | |
573 | vV(1,1) = cov[2]; | |
574 | vV(0,2) = cov[3]; vV(2,0) = cov[3]; | |
575 | vV(1,2) = cov[4]; vV(2,1) = cov[4]; | |
576 | vV(2,2) = cov[5]; | |
577 | ||
578 | TMatrixD sumWi(TMatrixD::kInverted,vV); | |
579 | TMatrixD sumWiri(sumWi,TMatrixD::kMult,rv); | |
580 | ||
581 | Int_t nUsedTrks = inVtx->GetNContributors(); | |
582 | Double_t chi2 = inVtx->GetChi2(); | |
583 | ||
584 | AliESDtrack *track = 0; | |
585 | trksTree->SetBranchAddress("tracks",&track); | |
586 | Int_t ntrks = trksTree->GetEntries(); | |
587 | for(Int_t i=0;i<ntrks;i++) { | |
588 | trksTree->GetEvent(i); | |
589 | if(!inVtx->UsesTrack(track->GetID())) { | |
590 | printf("track %d was not used in vertex fit\n",track->GetID()); | |
591 | continue; | |
592 | } | |
593 | Double_t alpha = track->GetAlpha(); | |
594 | Double_t xl = diamondxy[0]*TMath::Cos(alpha)+diamondxy[1]*TMath::Sin(alpha); | |
dc3719f3 | 595 | track->AliExternalTrackParam::PropagateTo(xl,GetFieldkG()); |
fee9ef0d | 596 | // vector of track global coordinates |
597 | TMatrixD ri(3,1); | |
598 | // covariance matrix of ri | |
599 | TMatrixD wWi(3,3); | |
600 | ||
601 | // get space point from track | |
602 | if(!TrackToPoint(track,ri,wWi)) continue; | |
603 | ||
604 | TMatrixD wWiri(wWi,TMatrixD::kMult,ri); | |
605 | ||
606 | sumWi -= wWi; | |
607 | sumWiri -= wWiri; | |
608 | ||
609 | // track chi2 | |
610 | TMatrixD deltar = rv; deltar -= ri; | |
611 | TMatrixD wWideltar(wWi,TMatrixD::kMult,deltar); | |
612 | Double_t chi2i = deltar(0,0)*wWideltar(0,0)+ | |
613 | deltar(1,0)*wWideltar(1,0)+ | |
614 | deltar(2,0)*wWideltar(2,0); | |
615 | // remove from total chi2 | |
616 | chi2 -= chi2i; | |
617 | ||
618 | nUsedTrks--; | |
619 | if(nUsedTrks<2) { | |
620 | printf("Trying to remove too many tracks!\n"); | |
621 | return 0x0; | |
622 | } | |
623 | } | |
624 | ||
625 | TMatrixD rvnew(3,1); | |
626 | TMatrixD vVnew(3,3); | |
627 | ||
628 | // new inverted of weights matrix | |
629 | TMatrixD invsumWi(TMatrixD::kInverted,sumWi); | |
630 | vVnew = invsumWi; | |
631 | // new position of primary vertex | |
632 | rvnew.Mult(vVnew,sumWiri); | |
633 | ||
634 | Double_t position[3]; | |
635 | position[0] = rvnew(0,0); | |
636 | position[1] = rvnew(1,0); | |
637 | position[2] = rvnew(2,0); | |
638 | cov[0] = vVnew(0,0); | |
639 | cov[1] = vVnew(0,1); | |
640 | cov[2] = vVnew(1,1); | |
641 | cov[3] = vVnew(0,2); | |
642 | cov[4] = vVnew(1,2); | |
643 | cov[5] = vVnew(2,2); | |
644 | ||
645 | // store data in the vertex object | |
646 | AliESDVertex *outVtx = new AliESDVertex(position,cov,chi2,nUsedTrks); | |
647 | outVtx->SetTitle(inVtx->GetTitle()); | |
648 | Double_t tp[3]; | |
649 | inVtx->GetTruePos(tp); | |
650 | outVtx->SetTruePos(tp); | |
651 | UShort_t *inindices = inVtx->GetIndices(); | |
652 | UShort_t *outindices = new UShort_t[outVtx->GetNContributors()]; | |
653 | Int_t j=0; | |
654 | Bool_t copyindex; | |
655 | for(Int_t k=0; k<inVtx->GetNIndices(); k++) { | |
656 | copyindex=kTRUE; | |
657 | for(Int_t l=0; l<ntrks; l++) { | |
658 | trksTree->GetEvent(l); | |
659 | if(inindices[k]==track->GetID()) copyindex=kFALSE; | |
660 | } | |
661 | if(copyindex) { | |
662 | outindices[j] = inindices[k]; j++; | |
663 | } | |
664 | } | |
665 | outVtx->SetIndices(outVtx->GetNContributors(),outindices); | |
666 | delete [] outindices; | |
667 | ||
668 | if(fDebug) { | |
669 | printf("Vertex before removing tracks:\n"); | |
670 | inVtx->PrintStatus(); | |
671 | inVtx->PrintIndices(); | |
672 | printf("Vertex after removing tracks:\n"); | |
673 | outVtx->PrintStatus(); | |
674 | outVtx->PrintIndices(); | |
675 | } | |
676 | ||
677 | return outVtx; | |
678 | } | |
679 | //--------------------------------------------------------------------------- | |
680 | void AliVertexerTracks::SetSkipTracks(Int_t n,Int_t *skipped) | |
681 | { | |
682 | // | |
683 | // Mark the tracks not to be used in the vertex reconstruction. | |
684 | // Tracks are identified by AliESDtrack::GetID() | |
685 | // | |
686 | fNTrksToSkip = n; fTrksToSkip = new Int_t[n]; | |
50ff0bcd | 687 | for(Int_t i=0;i<n;i++) fTrksToSkip[i] = skipped[i]; |
688 | return; | |
689 | } | |
690 | //--------------------------------------------------------------------------- | |
fee9ef0d | 691 | void AliVertexerTracks::SetVtxStart(AliESDVertex *vtx) |
692 | { | |
50ff0bcd | 693 | // |
694 | // Set initial vertex knowledge | |
695 | // | |
696 | vtx->GetXYZ(fNominalPos); | |
697 | vtx->GetCovMatrix(fNominalCov); | |
fee9ef0d | 698 | SetConstraintOn(); |
50ff0bcd | 699 | return; |
700 | } | |
2d57349e | 701 | //--------------------------------------------------------------------------- |
fee9ef0d | 702 | void AliVertexerTracks::StrLinVertexFinderMinDist(Int_t optUseWeights) |
dc3719f3 | 703 | { |
704 | AliESDtrack *track1; | |
705 | Double_t field=GetFieldkG(); | |
706 | const Int_t knacc = (Int_t)fTrkArray.GetEntriesFast(); | |
707 | TClonesArray *linarray = new TClonesArray("AliStrLine",1000); | |
708 | TClonesArray &lines = *linarray; | |
709 | for(Int_t i=0; i<knacc; i++){ | |
710 | track1 = (AliESDtrack*)fTrkArray.At(i); | |
711 | Double_t alpha=track1->GetAlpha(); | |
712 | Double_t mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; | |
713 | Double_t pos[3],dir[3],sigmasq[3]; | |
714 | track1->GetXYZAt(mindist,field,pos); | |
715 | track1->GetPxPyPzAt(mindist,field,dir); | |
716 | sigmasq[0]=TMath::Sin(alpha)*TMath::Sin(alpha)*track1->GetSigmaY2(); | |
717 | sigmasq[1]=TMath::Cos(alpha)*TMath::Cos(alpha)*track1->GetSigmaY2(); | |
718 | sigmasq[2]=track1->GetSigmaZ2(); | |
719 | new(lines[i]) AliStrLine(pos,sigmasq,dir); | |
720 | } | |
721 | fVert=TrackletVertexFinder(linarray,optUseWeights); | |
722 | linarray->Delete(); | |
723 | delete linarray; | |
724 | } | |
725 | //--------------------------------------------------------------------------- | |
726 | AliVertex AliVertexerTracks::TrackletVertexFinder(TClonesArray *lines, Int_t optUseWeights) | |
fee9ef0d | 727 | { |
2d57349e | 728 | // Calculate the point at minimum distance to prepared tracks |
729 | ||
dc3719f3 | 730 | const Int_t knacc = (Int_t)lines->GetEntriesFast(); |
731 | Double_t initPos[3]={0.,0.,0.}; | |
2d57349e | 732 | |
2d57349e | 733 | Double_t (*vectP0)[3]=new Double_t [knacc][3]; |
734 | Double_t (*vectP1)[3]=new Double_t [knacc][3]; | |
735 | ||
736 | Double_t sum[3][3]; | |
737 | Double_t dsum[3]={0,0,0}; | |
738 | for(Int_t i=0;i<3;i++) | |
739 | for(Int_t j=0;j<3;j++)sum[i][j]=0; | |
740 | for(Int_t i=0; i<knacc; i++){ | |
dc3719f3 | 741 | AliStrLine* line1 = (AliStrLine*)lines->At(i); |
742 | Double_t p0[3],cd[3],sigmasq[3]; | |
2d57349e | 743 | line1->GetP0(p0); |
744 | line1->GetCd(cd); | |
dc3719f3 | 745 | line1->GetSigma2P0(sigmasq); |
2d57349e | 746 | Double_t p1[3]={p0[0]+cd[0],p0[1]+cd[1],p0[2]+cd[2]}; |
747 | vectP0[i][0]=p0[0]; | |
748 | vectP0[i][1]=p0[1]; | |
749 | vectP0[i][2]=p0[2]; | |
750 | vectP1[i][0]=p1[0]; | |
751 | vectP1[i][1]=p1[1]; | |
752 | vectP1[i][2]=p1[2]; | |
753 | ||
754 | Double_t matr[3][3]; | |
755 | Double_t dknow[3]; | |
756 | if(optUseWeights==0)GetStrLinDerivMatrix(p0,p1,matr,dknow); | |
dc3719f3 | 757 | else GetStrLinDerivMatrix(p0,p1,sigmasq,matr,dknow); |
758 | ||
2d57349e | 759 | |
760 | for(Int_t iii=0;iii<3;iii++){ | |
761 | dsum[iii]+=dknow[iii]; | |
762 | for(Int_t lj=0;lj<3;lj++) sum[iii][lj]+=matr[iii][lj]; | |
763 | } | |
2d57349e | 764 | } |
765 | ||
766 | Double_t vett[3][3]; | |
767 | Double_t det=GetDeterminant3X3(sum); | |
dc3719f3 | 768 | Double_t sigma=0; |
2d57349e | 769 | |
fee9ef0d | 770 | if(det!=0){ |
771 | for(Int_t zz=0;zz<3;zz++){ | |
772 | for(Int_t ww=0;ww<3;ww++){ | |
773 | for(Int_t kk=0;kk<3;kk++) vett[ww][kk]=sum[ww][kk]; | |
774 | } | |
775 | for(Int_t kk=0;kk<3;kk++) vett[kk][zz]=dsum[kk]; | |
776 | initPos[zz]=GetDeterminant3X3(vett)/det; | |
777 | } | |
778 | ||
779 | ||
780 | for(Int_t i=0; i<knacc; i++){ | |
781 | Double_t p0[3]={0,0,0},p1[3]={0,0,0}; | |
782 | for(Int_t ii=0;ii<3;ii++){ | |
783 | p0[ii]=vectP0[i][ii]; | |
784 | p1[ii]=vectP1[i][ii]; | |
785 | } | |
786 | sigma+=GetStrLinMinDist(p0,p1,initPos); | |
787 | } | |
788 | ||
789 | sigma=TMath::Sqrt(sigma); | |
790 | }else{ | |
50ff0bcd | 791 | sigma=999; |
792 | } | |
dc3719f3 | 793 | AliVertex theVert(initPos,sigma,knacc); |
50ff0bcd | 794 | delete vectP0; |
795 | delete vectP1; | |
dc3719f3 | 796 | return theVert; |
50ff0bcd | 797 | } |
798 | //--------------------------------------------------------------------------- | |
fee9ef0d | 799 | Bool_t AliVertexerTracks::TrackToPoint(AliESDtrack *t, |
800 | TMatrixD &ri,TMatrixD &wWi) const | |
801 | { | |
802 | // | |
803 | // Extract from the AliESDtrack the global coordinates ri and covariance matrix | |
804 | // wWi of the space point that it represents (to be used in VertexFitter()) | |
805 | // | |
806 | ||
807 | ||
808 | Double_t rotAngle = t->GetAlpha(); | |
809 | if(rotAngle<0.) rotAngle += 2.*TMath::Pi(); | |
810 | Double_t cosRot = TMath::Cos(rotAngle); | |
811 | Double_t sinRot = TMath::Sin(rotAngle); | |
812 | ||
813 | ri(0,0) = t->GetX()*cosRot-t->GetY()*sinRot; | |
814 | ri(1,0) = t->GetX()*sinRot+t->GetY()*cosRot; | |
815 | ri(2,0) = t->GetZ(); | |
816 | ||
817 | // matrix to go from global (x,y,z) to local (y,z); | |
818 | TMatrixD qQi(2,3); | |
819 | qQi(0,0) = -sinRot; | |
820 | qQi(0,1) = cosRot; | |
821 | qQi(0,2) = 0.; | |
822 | qQi(1,0) = 0.; | |
823 | qQi(1,1) = 0.; | |
824 | qQi(1,2) = 1.; | |
825 | ||
826 | // covariance matrix of local (y,z) - inverted | |
827 | TMatrixD uUi(2,2); | |
828 | Double_t cc[15]; | |
829 | t->GetExternalCovariance(cc); | |
830 | uUi(0,0) = cc[0]; | |
831 | uUi(0,1) = cc[1]; | |
832 | uUi(1,0) = cc[1]; | |
833 | uUi(1,1) = cc[2]; | |
834 | if(uUi.Determinant() <= 0.) return kFALSE; | |
835 | TMatrixD uUiInv(TMatrixD::kInverted,uUi); | |
836 | ||
837 | // weights matrix: wWi = qQiT * uUiInv * qQi | |
838 | TMatrixD uUiInvQi(uUiInv,TMatrixD::kMult,qQi); | |
839 | TMatrixD m(qQi,TMatrixD::kTransposeMult,uUiInvQi); | |
840 | wWi = m; | |
841 | ||
842 | return kTRUE; | |
843 | } | |
844 | //--------------------------------------------------------------------------- | |
845 | void AliVertexerTracks::TooFewTracks(const AliESD* esdEvent) | |
846 | { | |
50ff0bcd | 847 | // |
848 | // When the number of tracks is < fMinTracks | |
849 | // | |
2d57349e | 850 | |
50ff0bcd | 851 | // deal with vertices not found |
852 | Double_t pos[3],err[3]; | |
853 | Int_t ncontr=0; | |
854 | pos[0] = fNominalPos[0]; | |
855 | err[0] = TMath::Sqrt(fNominalCov[0]); | |
856 | pos[1] = fNominalPos[1]; | |
857 | err[1] = TMath::Sqrt(fNominalCov[2]); | |
858 | pos[2] = esdEvent->GetVertex()->GetZv(); | |
859 | err[2] = esdEvent->GetVertex()->GetZRes(); | |
860 | if(err[0]>1. && esdEvent->GetVertex()->GetNContributors()<=0) | |
861 | ncontr = -1; // (x,y,z) = (0,0,0) | |
862 | if(err[0]>1. && esdEvent->GetVertex()->GetNContributors()>0) | |
863 | ncontr = -2; // (x,y,z) = (0,0,z_fromSPD) | |
864 | if(err[0]<1. && esdEvent->GetVertex()->GetNContributors()<=0) | |
865 | ncontr = -3; // (x,y,z) = (x_mean,y_mean,0) | |
866 | if(err[0]<1. && esdEvent->GetVertex()->GetNContributors()>0) | |
867 | ncontr = -4; // (x,y,z) = (x_mean,y_mean,z_fromSPD) | |
868 | fCurrentVertex = 0; | |
869 | fCurrentVertex = new AliESDVertex(pos,err); | |
870 | fCurrentVertex->SetNContributors(ncontr); | |
2d57349e | 871 | |
50ff0bcd | 872 | Double_t tp[3]; |
873 | esdEvent->GetVertex()->GetTruePos(tp); | |
874 | fCurrentVertex->SetTruePos(tp); | |
fee9ef0d | 875 | if(fConstraint) { |
876 | fCurrentVertex->SetTitle("VertexerTracksWithConstraint"); | |
877 | } else { | |
50ff0bcd | 878 | fCurrentVertex->SetTitle("VertexerTracksNoConstraint"); |
fee9ef0d | 879 | } |
2d57349e | 880 | |
50ff0bcd | 881 | return; |
882 | } | |
883 | //--------------------------------------------------------------------------- | |
fee9ef0d | 884 | void AliVertexerTracks::VertexFinder(Int_t optUseWeights) |
885 | { | |
2d57349e | 886 | |
50ff0bcd | 887 | // Get estimate of vertex position in (x,y) from tracks DCA |
888 | ||
889 | Double_t initPos[3]; | |
890 | initPos[2] = 0.; | |
891 | for(Int_t i=0;i<2;i++)initPos[i]=fNominalPos[i]; | |
892 | Int_t nacc = (Int_t)fTrkArray.GetEntriesFast(); | |
893 | Double_t aver[3]={0.,0.,0.}; | |
894 | Double_t aversq[3]={0.,0.,0.}; | |
895 | Double_t sigmasq[3]={0.,0.,0.}; | |
896 | Double_t sigma=0; | |
897 | Int_t ncombi = 0; | |
898 | AliESDtrack *track1; | |
899 | AliESDtrack *track2; | |
900 | Double_t pos[3],dir[3]; | |
901 | Double_t alpha,mindist; | |
dc3719f3 | 902 | Double_t field=GetFieldkG(); |
2d57349e | 903 | |
50ff0bcd | 904 | for(Int_t i=0; i<nacc; i++){ |
905 | track1 = (AliESDtrack*)fTrkArray.At(i); | |
906 | alpha=track1->GetAlpha(); | |
907 | mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; | |
908 | track1->GetXYZAt(mindist,field,pos); | |
909 | track1->GetPxPyPzAt(mindist,field,dir); | |
910 | AliStrLine *line1 = new AliStrLine(pos,dir); | |
2d57349e | 911 | |
50ff0bcd | 912 | // AliStrLine *line1 = new AliStrLine(); |
913 | // track1->ApproximateHelixWithLine(mindist,field,line1); | |
914 | ||
915 | for(Int_t j=i+1; j<nacc; j++){ | |
916 | track2 = (AliESDtrack*)fTrkArray.At(j); | |
917 | alpha=track2->GetAlpha(); | |
918 | mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; | |
919 | track2->GetXYZAt(mindist,field,pos); | |
920 | track2->GetPxPyPzAt(mindist,field,dir); | |
921 | AliStrLine *line2 = new AliStrLine(pos,dir); | |
922 | // AliStrLine *line2 = new AliStrLine(); | |
923 | // track2->ApproximateHelixWithLine(mindist,field,line2); | |
924 | Double_t distCA=line2->GetDCA(line1); | |
fee9ef0d | 925 | //printf("%d %d %f\n",i,j,distCA); |
926 | if(fDCAcut<=0 || (fDCAcut>0&&distCA<fDCAcut)){ | |
50ff0bcd | 927 | Double_t pnt1[3],pnt2[3],crosspoint[3]; |
2d57349e | 928 | |
50ff0bcd | 929 | if(optUseWeights<=0){ |
930 | Int_t retcode = line2->Cross(line1,crosspoint); | |
931 | if(retcode>=0){ | |
932 | ncombi++; | |
933 | for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj]; | |
934 | for(Int_t jj=0;jj<3;jj++)aversq[jj]+=(crosspoint[jj]*crosspoint[jj]); | |
935 | } | |
936 | } | |
937 | if(optUseWeights>0){ | |
938 | Int_t retcode = line1->CrossPoints(line2,pnt1,pnt2); | |
939 | if(retcode>=0){ | |
5c03260f | 940 | Double_t cs, sn; |
50ff0bcd | 941 | alpha=track1->GetAlpha(); |
942 | cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); | |
943 | Double_t sx1=sn*sn*track1->GetSigmaY2(), sy1=cs*cs*track1->GetSigmaY2(); | |
944 | alpha=track2->GetAlpha(); | |
945 | cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); | |
946 | Double_t sx2=sn*sn*track2->GetSigmaY2(), sy2=cs*cs*track2->GetSigmaY2(); | |
947 | Double_t sz1=track1->GetSigmaZ2(), sz2=track2->GetSigmaZ2(); | |
948 | Double_t wx1=sx2/(sx1+sx2), wx2=1.- wx1; | |
949 | Double_t wy1=sy2/(sy1+sy2), wy2=1.- wy1; | |
950 | Double_t wz1=sz2/(sz1+sz2), wz2=1.- wz1; | |
951 | crosspoint[0]=wx1*pnt1[0] + wx2*pnt2[0]; | |
952 | crosspoint[1]=wy1*pnt1[1] + wy2*pnt2[1]; | |
953 | crosspoint[2]=wz1*pnt1[2] + wz2*pnt2[2]; | |
954 | ||
955 | ncombi++; | |
956 | for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj]; | |
957 | for(Int_t jj=0;jj<3;jj++)aversq[jj]+=(crosspoint[jj]*crosspoint[jj]); | |
958 | } | |
959 | } | |
960 | } | |
961 | delete line2; | |
962 | } | |
963 | delete line1; | |
71d84967 | 964 | } |
50ff0bcd | 965 | if(ncombi>0){ |
966 | for(Int_t jj=0;jj<3;jj++){ | |
967 | initPos[jj] = aver[jj]/ncombi; | |
fee9ef0d | 968 | //printf("%f\n",initPos[jj]); |
50ff0bcd | 969 | aversq[jj]/=ncombi; |
970 | sigmasq[jj]=aversq[jj]-initPos[jj]*initPos[jj]; | |
971 | sigma+=sigmasq[jj]; | |
972 | } | |
973 | sigma=TMath::Sqrt(TMath::Abs(sigma)); | |
974 | } | |
975 | else { | |
976 | Warning("VertexFinder","Finder did not succed"); | |
977 | sigma=999; | |
978 | } | |
979 | fVert.SetXYZ(initPos); | |
980 | fVert.SetDispersion(sigma); | |
981 | fVert.SetNContributors(ncombi); | |
2d57349e | 982 | } |
ec1be5d5 | 983 | //--------------------------------------------------------------------------- |
fee9ef0d | 984 | void AliVertexerTracks::VertexFitter(Bool_t useConstraint) |
985 | { | |
ec1be5d5 | 986 | // |
987 | // The optimal estimate of the vertex position is given by a "weighted | |
988 | // average of tracks positions" | |
fee9ef0d | 989 | // Original method: V. Karimaki, CMS Note 97/0051 |
ec1be5d5 | 990 | // |
991 | Double_t initPos[3]; | |
992 | fVert.GetXYZ(initPos); | |
fee9ef0d | 993 | Int_t arrEntries = (Int_t)fTrkArray.GetEntries(); |
994 | if(arrEntries==1) useConstraint=kTRUE; | |
ec1be5d5 | 995 | if(fDebug) { |
996 | printf(" VertexFitter(): start\n"); | |
997 | printf(" Number of tracks in array: %d\n",(Int_t)fTrkArray.GetEntriesFast()); | |
998 | printf(" Minimum # tracks required in fit: %d\n",fMinTracks); | |
999 | printf("Vertex position after finder: %f,%f,%f\n",initPos[0],initPos[1],initPos[2]); | |
fee9ef0d | 1000 | 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 | 1001 | } |
1002 | ||
1003 | Int_t i,j,k,step=0; | |
1004 | TMatrixD rv(3,1); | |
1005 | TMatrixD vV(3,3); | |
1006 | rv(0,0) = initPos[0]; | |
1007 | rv(1,0) = initPos[1]; | |
1008 | rv(2,0) = 0.; | |
1009 | Double_t xlStart,alpha; | |
ec1be5d5 | 1010 | Int_t nUsedTrks; |
fee9ef0d | 1011 | Double_t chi2,chi2i,chi2b; |
ec1be5d5 | 1012 | AliESDtrack *t = 0; |
1013 | Int_t failed = 0; | |
1014 | ||
50ff0bcd | 1015 | // initial vertex covariance matrix |
1016 | TMatrixD vVb(3,3); | |
1017 | vVb(0,0) = fNominalCov[0]; | |
1018 | vVb(0,1) = fNominalCov[1]; | |
1019 | vVb(0,2) = 0.; | |
1020 | vVb(1,0) = fNominalCov[1]; | |
1021 | vVb(1,1) = fNominalCov[2]; | |
1022 | vVb(1,2) = 0.; | |
1023 | vVb(2,0) = 0.; | |
1024 | vVb(2,1) = 0.; | |
1025 | vVb(2,2) = fNominalCov[5]; | |
1026 | TMatrixD vVbInv(TMatrixD::kInverted,vVb); | |
1027 | TMatrixD rb(3,1); | |
1028 | rb(0,0) = fNominalPos[0]; | |
1029 | rb(1,0) = fNominalPos[1]; | |
1030 | rb(2,0) = fNominalPos[2]; | |
1031 | TMatrixD vVbInvrb(vVbInv,TMatrixD::kMult,rb); | |
1032 | ||
1033 | ||
eae1677e | 1034 | // 2 steps: |
1035 | // 1st - estimate of vtx using all tracks | |
1036 | // 2nd - estimate of global chi2 | |
1037 | for(step=0; step<2; step++) { | |
ec1be5d5 | 1038 | if(fDebug) printf(" step = %d\n",step); |
1039 | chi2 = 0.; | |
1040 | nUsedTrks = 0; | |
1041 | ||
1042 | TMatrixD sumWiri(3,1); | |
1043 | TMatrixD sumWi(3,3); | |
1044 | for(i=0; i<3; i++) { | |
1045 | sumWiri(i,0) = 0.; | |
1046 | for(j=0; j<3; j++) sumWi(j,i) = 0.; | |
1047 | } | |
1048 | ||
fee9ef0d | 1049 | // mean vertex constraint |
1050 | if(useConstraint) { | |
50ff0bcd | 1051 | for(i=0;i<3;i++) { |
1052 | sumWiri(i,0) += vVbInvrb(i,0); | |
1053 | for(k=0;k<3;k++) sumWi(i,k) += vVbInv(i,k); | |
07680cae | 1054 | } |
fee9ef0d | 1055 | // chi2 |
1056 | TMatrixD deltar = rv; deltar -= rb; | |
1057 | TMatrixD vVbInvdeltar(vVbInv,TMatrixD::kMult,deltar); | |
1058 | chi2b = deltar(0,0)*vVbInvdeltar(0,0)+ | |
1059 | deltar(1,0)*vVbInvdeltar(1,0)+ | |
1060 | deltar(2,0)*vVbInvdeltar(2,0); | |
1061 | chi2 += chi2b; | |
07680cae | 1062 | } |
1063 | ||
1064 | ||
ec1be5d5 | 1065 | // loop on tracks |
1066 | for(k=0; k<arrEntries; k++) { | |
ec1be5d5 | 1067 | // get track from track array |
1068 | t = (AliESDtrack*)fTrkArray.At(k); | |
1069 | alpha = t->GetAlpha(); | |
1070 | xlStart = initPos[0]*TMath::Cos(alpha)+initPos[1]*TMath::Sin(alpha); | |
fee9ef0d | 1071 | // to vtxSeed (from finder) |
dc3719f3 | 1072 | t->AliExternalTrackParam::PropagateTo(xlStart,GetFieldkG()); |
fee9ef0d | 1073 | |
1074 | ||
ec1be5d5 | 1075 | // vector of track global coordinates |
1076 | TMatrixD ri(3,1); | |
fee9ef0d | 1077 | // covariance matrix of ri |
1078 | TMatrixD wWi(3,3); | |
1079 | ||
1080 | // get space point from track | |
1081 | if(!TrackToPoint(t,ri,wWi)) continue; | |
1082 | ||
1083 | TMatrixD wWiri(wWi,TMatrixD::kMult,ri); | |
ec1be5d5 | 1084 | |
1085 | // track chi2 | |
1086 | TMatrixD deltar = rv; deltar -= ri; | |
1087 | TMatrixD wWideltar(wWi,TMatrixD::kMult,deltar); | |
1088 | chi2i = deltar(0,0)*wWideltar(0,0)+ | |
1089 | deltar(1,0)*wWideltar(1,0)+ | |
1090 | deltar(2,0)*wWideltar(2,0); | |
1091 | ||
ec1be5d5 | 1092 | // add to total chi2 |
1093 | chi2 += chi2i; | |
1094 | ||
ec1be5d5 | 1095 | sumWiri += wWiri; |
1096 | sumWi += wWi; | |
1097 | ||
1098 | nUsedTrks++; | |
1099 | } // end loop on tracks | |
1100 | ||
1101 | if(nUsedTrks < fMinTracks) { | |
1102 | failed=1; | |
1103 | continue; | |
1104 | } | |
1105 | ||
1106 | Double_t determinant = sumWi.Determinant(); | |
1107 | //cerr<<" determinant: "<<determinant<<endl; | |
1108 | if(determinant < 100.) { | |
1109 | printf("det(V) = 0\n"); | |
1110 | failed=1; | |
1111 | continue; | |
1112 | } | |
1113 | ||
1114 | // inverted of weights matrix | |
1115 | TMatrixD invsumWi(TMatrixD::kInverted,sumWi); | |
1116 | vV = invsumWi; | |
1117 | ||
1118 | // position of primary vertex | |
1119 | rv.Mult(vV,sumWiri); | |
1120 | ||
eae1677e | 1121 | } // end loop on the 2 steps |
ec1be5d5 | 1122 | |
5834e9a1 | 1123 | // delete t; |
ec1be5d5 | 1124 | |
1125 | if(failed) { | |
50ff0bcd | 1126 | if(fDebug) printf("TooFewTracks\n"); |
ec1be5d5 | 1127 | fCurrentVertex = new AliESDVertex(0.,0.,-1); |
1128 | return; | |
1129 | } | |
1130 | ||
1131 | Double_t position[3]; | |
1132 | position[0] = rv(0,0); | |
1133 | position[1] = rv(1,0); | |
1134 | position[2] = rv(2,0); | |
1135 | Double_t covmatrix[6]; | |
1136 | covmatrix[0] = vV(0,0); | |
1137 | covmatrix[1] = vV(0,1); | |
1138 | covmatrix[2] = vV(1,1); | |
1139 | covmatrix[3] = vV(0,2); | |
1140 | covmatrix[4] = vV(1,2); | |
1141 | covmatrix[5] = vV(2,2); | |
1142 | ||
dc3719f3 | 1143 | // for correct chi2/ndf, count constraint as additional "track" |
1144 | if(fConstraint) nUsedTrks++; | |
ec1be5d5 | 1145 | // store data in the vertex object |
1146 | fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nUsedTrks); | |
1147 | ||
1148 | if(fDebug) { | |
1149 | printf(" VertexFitter(): finish\n"); | |
1150 | printf(" rv = ( %f , %f , %f )\n\n",rv(0,0),rv(1,0),rv(2,0)); | |
1151 | fCurrentVertex->PrintStatus(); | |
1152 | } | |
1153 | ||
1154 | return; | |
1155 | } | |
50ff0bcd | 1156 | //---------------------------------------------------------------------------- |
fee9ef0d | 1157 | AliESDVertex* AliVertexerTracks::VertexForSelectedTracks(TTree *trkTree,Bool_t optUseFitter,Bool_t optPropagate) |
1158 | { | |
eae1677e | 1159 | // |
50ff0bcd | 1160 | // Return vertex from tracks in trkTree |
eae1677e | 1161 | // |
1162 | ||
fee9ef0d | 1163 | SetConstraintOff(); |
1164 | ||
50ff0bcd | 1165 | // get tracks and propagate them to initial vertex position |
fee9ef0d | 1166 | Int_t nTrksPrep = PrepareTracks(*trkTree,0); |
0c69be49 | 1167 | if(nTrksPrep < TMath::Max(2,fMinTracks) ) { |
50ff0bcd | 1168 | if(fDebug) printf("TooFewTracks\n"); |
fee9ef0d | 1169 | fCurrentVertex = new AliESDVertex(0.,0.,-1); |
1170 | return fCurrentVertex; | |
50ff0bcd | 1171 | } |
1172 | ||
fee9ef0d | 1173 | switch (fAlgo) { |
1174 | case 1: StrLinVertexFinderMinDist(1); break; | |
1175 | case 2: StrLinVertexFinderMinDist(0); break; | |
1176 | case 3: HelixVertexFinder(); break; | |
1177 | case 4: VertexFinder(1); break; | |
1178 | case 5: VertexFinder(0); break; | |
1179 | default: printf("Wrong algorithm\n"); break; | |
1180 | } | |
50ff0bcd | 1181 | |
fee9ef0d | 1182 | if(fDebug) printf(" Vertex finding completed\n"); |
1183 | ||
1184 | // vertex fitter | |
1185 | if(optUseFitter){ | |
1186 | VertexFitter(fConstraint); | |
1187 | if(fDebug) printf(" Vertex fit completed\n"); | |
1188 | }else{ | |
1189 | Double_t position[3]={fVert.GetXv(),fVert.GetYv(),fVert.GetZv()}; | |
1190 | Double_t covmatrix[6]={0.,0.,0.,0.,0.,0.}; | |
1191 | Double_t chi2=99999.; | |
1192 | Int_t nUsedTrks=fVert.GetNContributors(); | |
1193 | fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nUsedTrks); | |
1194 | } | |
1195 | fCurrentVertex->SetDispersion(fVert.GetDispersion()); | |
1196 | ||
1197 | ||
1198 | // set indices of used tracks and propagate track to found vertex | |
50ff0bcd | 1199 | UShort_t *indices = 0; |
1200 | AliESDtrack *eta = 0; | |
fee9ef0d | 1201 | if(fCurrentVertex->GetNContributors()>0) { |
1202 | indices = new UShort_t[fCurrentVertex->GetNContributors()]; | |
50ff0bcd | 1203 | for(Int_t jj=0;jj<(Int_t)fTrkArray.GetEntriesFast();jj++) { |
1204 | eta = (AliESDtrack*)fTrkArray.At(jj); | |
1205 | indices[jj] = (UShort_t)eta->GetID(); | |
fee9ef0d | 1206 | if(optPropagate&&optUseFitter){ |
1207 | if(TMath::Sqrt(fCurrentVertex->GetXv()*fCurrentVertex->GetXv()+fCurrentVertex->GetYv()*fCurrentVertex->GetYv())<3.) { | |
dc3719f3 | 1208 | eta->RelateToVertex(fCurrentVertex,GetFieldkG(),100.); |
fee9ef0d | 1209 | if(fDebug) printf("Track %d propagated to found vertex\n",jj); |
1210 | }else{ | |
1211 | AliWarning("Found vertex outside beam pipe!"); | |
1212 | } | |
1213 | } | |
50ff0bcd | 1214 | } |
fee9ef0d | 1215 | fCurrentVertex->SetIndices(fCurrentVertex->GetNContributors(),indices); |
50ff0bcd | 1216 | } |
1217 | delete [] indices; | |
1218 | fTrkArray.Delete(); | |
1219 | ||
fee9ef0d | 1220 | return fCurrentVertex; |
eae1677e | 1221 | } |
50ff0bcd | 1222 | //---------------------------------------------------------------------------- |
fee9ef0d | 1223 | AliESDVertex* AliVertexerTracks::VertexForSelectedTracks(TObjArray *trkArray,Bool_t optUseFitter, Bool_t optPropagate) |
1224 | { | |
50ff0bcd | 1225 | // |
1226 | // Return vertex from array of tracks | |
1227 | // | |
5834e9a1 | 1228 | |
50ff0bcd | 1229 | // get tracks and propagate them to initial vertex position |
1230 | Int_t nTrks = trkArray->GetEntriesFast(); | |
0c69be49 | 1231 | if(nTrks < TMath::Max(2,fMinTracks) ) { |
50ff0bcd | 1232 | if(fDebug) printf("TooFewTracks\n"); |
fee9ef0d | 1233 | fCurrentVertex = new AliESDVertex(0.,0.,-1); |
1234 | return fCurrentVertex; | |
50ff0bcd | 1235 | } |
1236 | TTree *trkTree = new TTree("TreeT","tracks"); | |
1237 | AliESDtrack *esdTrack = 0; | |
1238 | trkTree->Branch("tracks","AliESDtrack",&esdTrack); | |
1239 | for(Int_t i=0; i<nTrks; i++){ | |
1240 | esdTrack = (AliESDtrack*)trkArray->At(i); | |
1241 | trkTree->Fill(); | |
1242 | } | |
1243 | ||
fee9ef0d | 1244 | AliESDVertex *vtx = VertexForSelectedTracks(trkTree,optUseFitter,optPropagate); |
50ff0bcd | 1245 | delete trkTree; |
1246 | return vtx; | |
1247 | } | |
1248 | //-------------------------------------------------------------------------- |