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2d57349e | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-2003, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | //----------------------------------------------------------------- | |
6d8df534 | 17 | // Implementation of the vertexer from tracks |
2d57349e | 18 | // |
19 | // Origin: AliITSVertexerTracks | |
20 | // A.Dainese, Padova, | |
21 | // andrea.dainese@pd.infn.it | |
22 | // M.Masera, Torino, | |
23 | // massimo.masera@to.infn.it | |
24 | // Moved to STEER and adapted to ESD tracks: | |
6d8df534 | 25 | // F.Prino, Torino, prino@to.infn.it |
2d57349e | 26 | //----------------------------------------------------------------- |
27 | ||
28 | //---- Root headers -------- | |
a7ede274 | 29 | #include <TSystem.h> |
30 | #include <TDirectory.h> | |
31 | #include <TFile.h> | |
2d57349e | 32 | #include <TTree.h> |
ec1be5d5 | 33 | #include <TMatrixD.h> |
2d57349e | 34 | //---- AliRoot headers ----- |
919e537f | 35 | #include "AliLog.h" |
2d57349e | 36 | #include "AliStrLine.h" |
6d8df534 | 37 | #include "AliExternalTrackParam.h" |
af885e0f | 38 | #include "AliESDEvent.h" |
2d57349e | 39 | #include "AliESDtrack.h" |
6d8df534 | 40 | #include "AliVertexerTracks.h" |
2d57349e | 41 | |
42 | ClassImp(AliVertexerTracks) | |
43 | ||
44 | ||
45 | //---------------------------------------------------------------------------- | |
46 | AliVertexerTracks::AliVertexerTracks(): | |
07680cae | 47 | TObject(), |
48 | fVert(), | |
49 | fCurrentVertex(0), | |
f09c879d | 50 | fMode(0), |
dc3719f3 | 51 | fFieldkG(-999.), |
6d8df534 | 52 | fTrkArraySel(), |
53 | fIdSel(0), | |
07680cae | 54 | fTrksToSkip(0), |
55 | fNTrksToSkip(0), | |
f09c879d | 56 | fConstraint(kFALSE), |
57 | fOnlyFitter(kFALSE), | |
58 | fMinTracks(1), | |
6b29d399 | 59 | fMinClusters(5), |
f09c879d | 60 | fDCAcut(0.1), |
61 | fDCAcutIter0(0.1), | |
62 | fNSigma(3.), | |
fee9ef0d | 63 | fMaxd0z0(0.5), |
f09c879d | 64 | fMinDetFitter(100.), |
65 | fMaxTgl(1000.), | |
50ff0bcd | 66 | fITSrefit(kTRUE), |
6b29d399 | 67 | fFiducialR(3.), |
68 | fFiducialZ(30.), | |
3b768a1d | 69 | fnSigmaForUi00(1.5), |
f09c879d | 70 | fAlgo(1) |
2d57349e | 71 | { |
72 | // | |
73 | // Default constructor | |
74 | // | |
3b768a1d | 75 | SetVtxStart(); |
07680cae | 76 | SetVtxStartSigma(); |
2d57349e | 77 | } |
dc3719f3 | 78 | //---------------------------------------------------------------------------- |
79 | AliVertexerTracks::AliVertexerTracks(Double_t fieldkG): | |
07680cae | 80 | TObject(), |
81 | fVert(), | |
82 | fCurrentVertex(0), | |
f09c879d | 83 | fMode(0), |
84 | fFieldkG(fieldkG), | |
6d8df534 | 85 | fTrkArraySel(), |
86 | fIdSel(0), | |
07680cae | 87 | fTrksToSkip(0), |
88 | fNTrksToSkip(0), | |
f09c879d | 89 | fConstraint(kFALSE), |
90 | fOnlyFitter(kFALSE), | |
91 | fMinTracks(1), | |
6b29d399 | 92 | fMinClusters(5), |
f09c879d | 93 | fDCAcut(0.1), |
94 | fDCAcutIter0(0.1), | |
95 | fNSigma(3.), | |
fee9ef0d | 96 | fMaxd0z0(0.5), |
f09c879d | 97 | fMinDetFitter(100.), |
98 | fMaxTgl(1000.), | |
50ff0bcd | 99 | fITSrefit(kTRUE), |
6b29d399 | 100 | fFiducialR(3.), |
101 | fFiducialZ(30.), | |
3b768a1d | 102 | fnSigmaForUi00(1.5), |
f09c879d | 103 | fAlgo(1) |
2d57349e | 104 | { |
105 | // | |
106 | // Standard constructor | |
107 | // | |
3b768a1d | 108 | SetVtxStart(); |
07680cae | 109 | SetVtxStartSigma(); |
6b29d399 | 110 | SetTPCMode(); |
2d57349e | 111 | } |
112 | //----------------------------------------------------------------------------- | |
fee9ef0d | 113 | AliVertexerTracks::~AliVertexerTracks() |
114 | { | |
2d57349e | 115 | // Default Destructor |
eae1677e | 116 | // The objects pointed by the following pointer are not owned |
2d57349e | 117 | // by this class and are not deleted |
ec1be5d5 | 118 | fCurrentVertex = 0; |
146c29df | 119 | if(fTrksToSkip) { delete [] fTrksToSkip; fTrksToSkip=NULL; } |
6d8df534 | 120 | if(fIdSel) { delete [] fIdSel; fIdSel=NULL; } |
ec1be5d5 | 121 | } |
c5e3e5d1 | 122 | //---------------------------------------------------------------------------- |
af885e0f | 123 | AliESDVertex* AliVertexerTracks::FindPrimaryVertex(const AliESDEvent *esdEvent) |
ec1be5d5 | 124 | { |
c5e3e5d1 | 125 | // |
ec1be5d5 | 126 | // Primary vertex for current ESD event |
eae1677e | 127 | // (Two iterations: |
fee9ef0d | 128 | // 1st with 5*fNSigma*sigma cut w.r.t. to initial vertex |
129 | // + cut on sqrt(d0d0+z0z0) if fConstraint=kFALSE | |
130 | // 2nd with fNSigma*sigma cut w.r.t. to vertex found in 1st iteration) | |
07680cae | 131 | // |
132 | fCurrentVertex = 0; | |
133 | ||
dc3719f3 | 134 | // accept 1-track case only if constraint is available |
135 | if(!fConstraint && fMinTracks==1) fMinTracks=2; | |
136 | ||
fee9ef0d | 137 | // read tracks from ESD |
6d8df534 | 138 | Int_t nTrks = (Int_t)esdEvent->GetNumberOfTracks(); |
f09c879d | 139 | if(nTrks<fMinTracks) { |
6d8df534 | 140 | TooFewTracks(); |
80d36431 | 141 | return fCurrentVertex; |
142 | } | |
6d8df534 | 143 | // |
713e5fbf | 144 | |
a7ede274 | 145 | TDirectory * olddir = gDirectory; |
f09c879d | 146 | TFile *f = 0; |
147 | if(nTrks>500) f = new TFile("VertexerTracks.root","recreate"); | |
6d8df534 | 148 | TObjArray trkArrayOrig(nTrks); |
149 | UShort_t *idOrig = new UShort_t[nTrks]; | |
07680cae | 150 | |
6d8df534 | 151 | Int_t nTrksOrig=0; |
f09c879d | 152 | AliExternalTrackParam *t=0; |
153 | // loop on ESD tracks | |
6d8df534 | 154 | for(Int_t i=0; i<nTrks; i++) { |
155 | AliESDtrack *esdt = esdEvent->GetTrack(i); | |
eae1677e | 156 | // check tracks to skip |
6d8df534 | 157 | Bool_t skipThis = kFALSE; |
eae1677e | 158 | for(Int_t j=0; j<fNTrksToSkip; j++) { |
6d8df534 | 159 | if(esdt->GetID()==fTrksToSkip[j]) { |
919e537f | 160 | AliDebug(1,Form("skipping track: %d",i)); |
eae1677e | 161 | skipThis = kTRUE; |
162 | } | |
163 | } | |
a7ede274 | 164 | if(skipThis) continue; |
f09c879d | 165 | |
6b29d399 | 166 | // check number of clusters in ITS or TPC |
167 | if(esdt->GetNcls(fMode) < fMinClusters) continue; | |
168 | ||
f09c879d | 169 | if(fMode==0) { // ITS mode |
170 | if(fITSrefit && !(esdt->GetStatus()&AliESDtrack::kITSrefit)) continue; | |
f09c879d | 171 | Double_t x,p[5],cov[15]; |
172 | esdt->GetExternalParameters(x,p); | |
173 | esdt->GetExternalCovariance(cov); | |
174 | t = new AliExternalTrackParam(x,esdt->GetAlpha(),p,cov); | |
175 | } else if(fMode==1) { // TPC mode | |
176 | t = (AliExternalTrackParam*)esdt->GetTPCInnerParam(); | |
177 | if(!t) continue; | |
178 | Double_t radius = 2.8; //something less than the beam pipe radius | |
179 | if(!PropagateTrackTo(t,radius)) continue; | |
50ff0bcd | 180 | } |
6d8df534 | 181 | trkArrayOrig.AddLast(t); |
182 | idOrig[nTrksOrig]=(UShort_t)esdt->GetID(); | |
183 | nTrksOrig++; | |
f09c879d | 184 | } // end loop on ESD tracks |
fee9ef0d | 185 | |
f09c879d | 186 | // call method that will reconstruct the vertex |
6d8df534 | 187 | FindPrimaryVertex(&trkArrayOrig,idOrig); |
188 | ||
f09c879d | 189 | if(fMode==0) trkArrayOrig.Delete(); |
6d8df534 | 190 | delete [] idOrig; idOrig=NULL; |
f09c879d | 191 | |
192 | if(f) { | |
193 | f->Close(); delete f; f = NULL; | |
194 | gSystem->Unlink("VertexerTracks.root"); | |
195 | olddir->cd(); | |
196 | } | |
6d8df534 | 197 | |
198 | return fCurrentVertex; | |
199 | } | |
200 | //---------------------------------------------------------------------------- | |
201 | AliESDVertex* AliVertexerTracks::FindPrimaryVertex(TObjArray *trkArrayOrig, | |
202 | UShort_t *idOrig) | |
203 | { | |
204 | // | |
205 | // Primary vertex using the AliExternalTrackParam's in the TObjArray. | |
206 | // idOrig must contain the track IDs from AliESDtrack::GetID() | |
207 | // (Two iterations: | |
208 | // 1st with 5*fNSigma*sigma cut w.r.t. to initial vertex | |
209 | // + cut on sqrt(d0d0+z0z0) if fConstraint=kFALSE | |
210 | // 2nd with fNSigma*sigma cut w.r.t. to vertex found in 1st iteration) | |
211 | // | |
212 | fCurrentVertex = 0; | |
213 | ||
214 | // accept 1-track case only if constraint is available | |
215 | if(!fConstraint && fMinTracks==1) fMinTracks=2; | |
216 | ||
f09c879d | 217 | // read tracks from array |
6d8df534 | 218 | Int_t nTrksOrig = (Int_t)trkArrayOrig->GetEntriesFast(); |
919e537f | 219 | AliDebug(1,Form("Initial number of tracks: %d",nTrksOrig)); |
f09c879d | 220 | if(nTrksOrig<fMinTracks) { |
919e537f | 221 | AliDebug(1,"TooFewTracks"); |
6d8df534 | 222 | TooFewTracks(); |
223 | return fCurrentVertex; | |
224 | } | |
225 | ||
fee9ef0d | 226 | // If fConstraint=kFALSE |
227 | // run VertexFinder(1) to get rough estimate of initVertex (x,y) | |
228 | if(!fConstraint) { | |
6d8df534 | 229 | // fill fTrkArraySel, for VertexFinder() |
230 | fIdSel = new UShort_t[nTrksOrig]; | |
231 | PrepareTracks(*trkArrayOrig,idOrig,0); | |
232 | if(fIdSel) { delete [] fIdSel; fIdSel=NULL; } | |
233 | Double_t cutsave = fDCAcut; | |
f09c879d | 234 | fDCAcut = fDCAcutIter0; |
235 | VertexFinder(1); // using weights, cutting dca < fDCAcutIter0 | |
fee9ef0d | 236 | fDCAcut = cutsave; |
fee9ef0d | 237 | if(fVert.GetNContributors()>0) { |
238 | fVert.GetXYZ(fNominalPos); | |
239 | fNominalPos[0] = fVert.GetXv(); | |
240 | fNominalPos[1] = fVert.GetYv(); | |
241 | fNominalPos[2] = fVert.GetZv(); | |
919e537f | 242 | AliDebug(1,Form("No mean vertex: VertexFinder gives (%f, %f, %f)",fNominalPos[0],fNominalPos[1],fNominalPos[2])); |
fee9ef0d | 243 | } else { |
244 | fNominalPos[0] = 0.; | |
245 | fNominalPos[1] = 0.; | |
246 | fNominalPos[2] = 0.; | |
919e537f | 247 | AliDebug(1,"No mean vertex and VertexFinder failed"); |
0c69be49 | 248 | } |
07680cae | 249 | } |
fee9ef0d | 250 | |
251 | // TWO ITERATIONS: | |
252 | // | |
253 | // ITERATION 1 | |
254 | // propagate tracks to fNominalPos vertex | |
255 | // preselect them: | |
256 | // if(constraint) reject for |d0|>5*fNSigma*sigma w.r.t. fNominal... vertex | |
257 | // else reject for |d0|\oplus|z0| > 5 mm w.r.t. fNominal... vertex | |
07680cae | 258 | // ITERATION 2 |
259 | // propagate tracks to best between initVertex and fCurrentVertex | |
260 | // preselect tracks (reject for |d0|>fNSigma*sigma w.r.t. best | |
261 | // between initVertex and fCurrentVertex) | |
6d8df534 | 262 | for(Int_t iter=1; iter<=2; iter++) { |
263 | if(fOnlyFitter && iter==1) continue; | |
264 | if(fIdSel) { delete [] fIdSel; fIdSel=NULL; } | |
265 | fIdSel = new UShort_t[nTrksOrig]; | |
266 | Int_t nTrksSel = PrepareTracks(*trkArrayOrig,idOrig,iter); | |
919e537f | 267 | AliDebug(1,Form("N tracks selected in iteration %d: %d",iter,nTrksSel)); |
6d8df534 | 268 | if(nTrksSel < fMinTracks) { |
269 | TooFewTracks(); | |
fee9ef0d | 270 | return fCurrentVertex; |
271 | } | |
07680cae | 272 | |
fee9ef0d | 273 | // vertex finder |
274 | if(!fOnlyFitter) { | |
6d8df534 | 275 | if(nTrksSel==1) { |
919e537f | 276 | AliDebug(1,"Just one track"); |
fee9ef0d | 277 | OneTrackVertFinder(); |
6d8df534 | 278 | } else { |
fee9ef0d | 279 | switch (fAlgo) { |
280 | case 1: StrLinVertexFinderMinDist(1); break; | |
281 | case 2: StrLinVertexFinderMinDist(0); break; | |
282 | case 3: HelixVertexFinder(); break; | |
283 | case 4: VertexFinder(1); break; | |
284 | case 5: VertexFinder(0); break; | |
919e537f | 285 | default: printf("Wrong algorithm"); break; |
fee9ef0d | 286 | } |
287 | } | |
919e537f | 288 | AliDebug(1," Vertex finding completed"); |
0c69be49 | 289 | } |
07680cae | 290 | |
fee9ef0d | 291 | // vertex fitter |
6d8df534 | 292 | VertexFitter(); |
fee9ef0d | 293 | } // end loop on the two iterations |
07680cae | 294 | |
fee9ef0d | 295 | |
50ff0bcd | 296 | // set indices of used tracks |
297 | UShort_t *indices = 0; | |
50ff0bcd | 298 | if(fCurrentVertex->GetNContributors()>0) { |
4d023a8f | 299 | Int_t nIndices = (Int_t)fTrkArraySel.GetEntriesFast(); |
300 | indices = new UShort_t[nIndices]; | |
301 | for(Int_t jj=0; jj<nIndices; jj++) | |
6d8df534 | 302 | indices[jj] = fIdSel[jj]; |
4d023a8f | 303 | fCurrentVertex->SetIndices(nIndices,indices); |
50ff0bcd | 304 | } |
6d8df534 | 305 | delete [] indices; indices=NULL; |
306 | // | |
fee9ef0d | 307 | |
6d8df534 | 308 | // set vertex title |
309 | TString title="VertexerTracksNoConstraint"; | |
310 | if(fConstraint) { | |
311 | title="VertexerTracksWithConstraint"; | |
312 | if(fOnlyFitter) title.Append("OnlyFitter"); | |
313 | } | |
314 | fCurrentVertex->SetTitle(title.Data()); | |
315 | // | |
a7ede274 | 316 | |
919e537f | 317 | AliDebug(1,Form("xyz: %f %f %f; nc %d",fCurrentVertex->GetXv(),fCurrentVertex->GetYv(),fCurrentVertex->GetZv(),fCurrentVertex->GetNContributors())); |
50ff0bcd | 318 | |
6d8df534 | 319 | // clean up |
320 | delete [] fIdSel; fIdSel=NULL; | |
321 | fTrkArraySel.Delete(); | |
146c29df | 322 | if(fTrksToSkip) { delete [] fTrksToSkip; fTrksToSkip=NULL; } |
6d8df534 | 323 | // |
fee9ef0d | 324 | |
07680cae | 325 | return fCurrentVertex; |
326 | } | |
50ff0bcd | 327 | //------------------------------------------------------------------------ |
fee9ef0d | 328 | Double_t AliVertexerTracks::GetDeterminant3X3(Double_t matr[][3]) |
329 | { | |
50ff0bcd | 330 | // |
331 | 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]; | |
332 | return det; | |
333 | } | |
334 | //------------------------------------------------------------------------- | |
fee9ef0d | 335 | void AliVertexerTracks::GetStrLinDerivMatrix(Double_t *p0,Double_t *p1,Double_t (*m)[3],Double_t *d) |
336 | { | |
50ff0bcd | 337 | // |
338 | Double_t x12=p0[0]-p1[0]; | |
339 | Double_t y12=p0[1]-p1[1]; | |
340 | Double_t z12=p0[2]-p1[2]; | |
341 | Double_t kk=x12*x12+y12*y12+z12*z12; | |
342 | m[0][0]=2-2/kk*x12*x12; | |
343 | m[0][1]=-2/kk*x12*y12; | |
344 | m[0][2]=-2/kk*x12*z12; | |
345 | m[1][0]=-2/kk*x12*y12; | |
346 | m[1][1]=2-2/kk*y12*y12; | |
347 | m[1][2]=-2/kk*y12*z12; | |
348 | m[2][0]=-2/kk*x12*z12; | |
349 | m[2][1]=-2*y12*z12; | |
350 | m[2][2]=2-2/kk*z12*z12; | |
351 | d[0]=2*p0[0]-2/kk*p0[0]*x12*x12-2/kk*p0[2]*x12*z12-2/kk*p0[1]*x12*y12; | |
352 | d[1]=2*p0[1]-2/kk*p0[1]*y12*y12-2/kk*p0[0]*x12*y12-2/kk*p0[2]*z12*y12; | |
353 | d[2]=2*p0[2]-2/kk*p0[2]*z12*z12-2/kk*p0[0]*x12*z12-2/kk*p0[1]*z12*y12; | |
c5e3e5d1 | 354 | |
50ff0bcd | 355 | } |
356 | //-------------------------------------------------------------------------- | |
fee9ef0d | 357 | void AliVertexerTracks::GetStrLinDerivMatrix(Double_t *p0,Double_t *p1,Double_t *sigmasq,Double_t (*m)[3],Double_t *d) |
358 | { | |
50ff0bcd | 359 | // |
360 | Double_t x12=p1[0]-p0[0]; | |
361 | Double_t y12=p1[1]-p0[1]; | |
362 | Double_t z12=p1[2]-p0[2]; | |
c5e3e5d1 | 363 | |
50ff0bcd | 364 | Double_t den= x12*x12*sigmasq[1]*sigmasq[2]+y12*y12*sigmasq[0]*sigmasq[2]+z12*z12*sigmasq[0]*sigmasq[1]; |
c5e3e5d1 | 365 | |
50ff0bcd | 366 | Double_t kk= 2*(x12*x12/sigmasq[0]+y12*y12/sigmasq[1]+z12*z12/sigmasq[2]); |
c5e3e5d1 | 367 | |
50ff0bcd | 368 | Double_t cc[3]; |
369 | cc[0]=-x12/sigmasq[0]; | |
370 | cc[1]=-y12/sigmasq[1]; | |
371 | cc[2]=-z12/sigmasq[2]; | |
ec1be5d5 | 372 | |
50ff0bcd | 373 | 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 | 374 | |
50ff0bcd | 375 | Double_t ss= -p0[0]*cc[0]-p0[1]*cc[1]-p0[2]*cc[2]; |
2d57349e | 376 | |
50ff0bcd | 377 | Double_t aa[3]; |
378 | aa[0]=x12*sigmasq[1]*sigmasq[2]/den; | |
379 | aa[1]=y12*sigmasq[0]*sigmasq[2]/den; | |
380 | aa[2]=z12*sigmasq[0]*sigmasq[1]/den; | |
2d57349e | 381 | |
50ff0bcd | 382 | m[0][0]=aa[0]*(aa[0]*kk+2*cc[0])+2*cc[0]*aa[0]+2/sigmasq[0]; |
383 | m[0][1]=aa[1]*(aa[0]*kk+2*cc[0])+2*cc[1]*aa[0]; | |
384 | m[0][2]=aa[2]*(aa[0]*kk+2*cc[0])+2*cc[2]*aa[0]; | |
2d57349e | 385 | |
50ff0bcd | 386 | m[1][0]=aa[0]*(aa[1]*kk+2*cc[1])+2*cc[0]*aa[1]; |
387 | m[1][1]=aa[1]*(aa[1]*kk+2*cc[1])+2*cc[1]*aa[1]+2/sigmasq[1]; | |
388 | m[1][2]=aa[2]*(aa[1]*kk+2*cc[1])+2*cc[2]*aa[1]; | |
2d57349e | 389 | |
50ff0bcd | 390 | m[2][0]=aa[0]*(aa[2]*kk+2*cc[2])+2*cc[0]*aa[2]; |
391 | m[2][1]=aa[1]*(aa[2]*kk+2*cc[2])+2*cc[1]*aa[2]; | |
392 | m[2][2]=aa[2]*(aa[2]*kk+2*cc[2])+2*cc[2]*aa[2]+2/sigmasq[2]; | |
08df6187 | 393 | |
50ff0bcd | 394 | d[0]=-ww*(aa[0]*kk+2*cc[0])-2*ss*aa[0]+2*p0[0]/sigmasq[0]; |
395 | d[1]=-ww*(aa[1]*kk+2*cc[1])-2*ss*aa[1]+2*p0[1]/sigmasq[1]; | |
396 | d[2]=-ww*(aa[2]*kk+2*cc[2])-2*ss*aa[2]+2*p0[2]/sigmasq[2]; | |
2d57349e | 397 | |
2d57349e | 398 | } |
50ff0bcd | 399 | //-------------------------------------------------------------------------- |
fee9ef0d | 400 | Double_t AliVertexerTracks::GetStrLinMinDist(Double_t *p0,Double_t *p1,Double_t *x0) |
401 | { | |
50ff0bcd | 402 | // |
403 | Double_t x12=p0[0]-p1[0]; | |
404 | Double_t y12=p0[1]-p1[1]; | |
405 | Double_t z12=p0[2]-p1[2]; | |
406 | Double_t x10=p0[0]-x0[0]; | |
407 | Double_t y10=p0[1]-x0[1]; | |
408 | Double_t z10=p0[2]-x0[2]; | |
3446476f | 409 | // return ((x10*x10+y10*y10+z10*z10)*(x12*x12+y12*y12+z12*z12)-(x10*x12+y10*y12+z10*z12)*(x10*x12+y10*y12+z10*z12))/(x12*x12+y12*y12+z12*z12); |
3446476f | 410 | return ((y10*z12-z10*y12)*(y10*z12-z10*y12)+ |
411 | (z10*x12-x10*z12)*(z10*x12-x10*z12)+ | |
412 | (x10*y12-y10*x12)*(x10*y12-y10*x12)) | |
413 | /(x12*x12+y12*y12+z12*z12); | |
2d57349e | 414 | } |
415 | //--------------------------------------------------------------------------- | |
fee9ef0d | 416 | void AliVertexerTracks::OneTrackVertFinder() |
417 | { | |
0c69be49 | 418 | // find vertex for events with 1 track, using DCA to nominal beam axis |
919e537f | 419 | AliDebug(1,Form("Number of prepared tracks =%d - Call OneTrackVertFinder",fTrkArraySel.GetEntries())); |
6d8df534 | 420 | AliExternalTrackParam *track1; |
421 | track1 = (AliExternalTrackParam*)fTrkArraySel.At(0); | |
0c69be49 | 422 | Double_t alpha=track1->GetAlpha(); |
423 | Double_t mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; | |
424 | Double_t pos[3],dir[3]; | |
f09c879d | 425 | track1->GetXYZAt(mindist,GetFieldkG(),pos); |
426 | track1->GetPxPyPzAt(mindist,GetFieldkG(),dir); | |
0c69be49 | 427 | AliStrLine *line1 = new AliStrLine(pos,dir); |
428 | Double_t p1[3]={fNominalPos[0],fNominalPos[1],0.}; | |
429 | Double_t p2[3]={fNominalPos[0],fNominalPos[1],10.}; | |
430 | AliStrLine *zeta=new AliStrLine(p1,p2,kTRUE); | |
431 | Double_t crosspoint[3]={0.,0.,0.}; | |
432 | Double_t sigma=999.; | |
433 | Int_t nContrib=-1; | |
434 | Int_t retcode = zeta->Cross(line1,crosspoint); | |
435 | if(retcode>=0){ | |
436 | sigma=line1->GetDistFromPoint(crosspoint); | |
437 | nContrib=1; | |
438 | } | |
439 | delete zeta; | |
440 | delete line1; | |
441 | fVert.SetXYZ(crosspoint); | |
442 | fVert.SetDispersion(sigma); | |
443 | fVert.SetNContributors(nContrib); | |
444 | } | |
445 | //--------------------------------------------------------------------------- | |
fee9ef0d | 446 | void AliVertexerTracks::HelixVertexFinder() |
447 | { | |
2d57349e | 448 | // Get estimate of vertex position in (x,y) from tracks DCA |
449 | ||
450 | ||
451 | Double_t initPos[3]; | |
452 | initPos[2] = 0.; | |
453 | for(Int_t i=0;i<2;i++)initPos[i]=fNominalPos[i]; | |
2d57349e | 454 | |
6d8df534 | 455 | Int_t nacc = (Int_t)fTrkArraySel.GetEntriesFast(); |
2d57349e | 456 | |
457 | Double_t aver[3]={0.,0.,0.}; | |
458 | Double_t averquad[3]={0.,0.,0.}; | |
459 | Double_t sigmaquad[3]={0.,0.,0.}; | |
460 | Double_t sigma=0; | |
461 | Int_t ncombi = 0; | |
6d8df534 | 462 | AliExternalTrackParam *track1; |
463 | AliExternalTrackParam *track2; | |
2d57349e | 464 | Double_t distCA; |
6d8df534 | 465 | Double_t x; |
2d57349e | 466 | Double_t alpha, cs, sn; |
467 | Double_t crosspoint[3]; | |
468 | for(Int_t i=0; i<nacc; i++){ | |
6d8df534 | 469 | track1 = (AliExternalTrackParam*)fTrkArraySel.At(i); |
2d57349e | 470 | |
471 | ||
472 | for(Int_t j=i+1; j<nacc; j++){ | |
6d8df534 | 473 | track2 = (AliExternalTrackParam*)fTrkArraySel.At(j); |
2d57349e | 474 | |
f09c879d | 475 | distCA=track2->PropagateToDCA(track1,GetFieldkG()); |
2d57349e | 476 | if(fDCAcut<=0 ||(fDCAcut>0&&distCA<fDCAcut)){ |
6d8df534 | 477 | x=track1->GetX(); |
2d57349e | 478 | alpha=track1->GetAlpha(); |
479 | cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); | |
6d8df534 | 480 | Double_t x1=x*cs - track1->GetY()*sn; |
481 | Double_t y1=x*sn + track1->GetY()*cs; | |
482 | Double_t z1=track1->GetZ(); | |
483 | ||
2d57349e | 484 | Double_t sx1=sn*sn*track1->GetSigmaY2(), sy1=cs*cs*track1->GetSigmaY2(); |
6d8df534 | 485 | x=track2->GetX(); |
2d57349e | 486 | alpha=track2->GetAlpha(); |
487 | cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); | |
6d8df534 | 488 | Double_t x2=x*cs - track2->GetY()*sn; |
489 | Double_t y2=x*sn + track2->GetY()*cs; | |
490 | Double_t z2=track2->GetZ(); | |
2d57349e | 491 | Double_t sx2=sn*sn*track2->GetSigmaY2(), sy2=cs*cs*track2->GetSigmaY2(); |
492 | Double_t sz1=track1->GetSigmaZ2(), sz2=track2->GetSigmaZ2(); | |
493 | Double_t wx1=sx2/(sx1+sx2), wx2=1.- wx1; | |
494 | Double_t wy1=sy2/(sy1+sy2), wy2=1.- wy1; | |
495 | Double_t wz1=sz2/(sz1+sz2), wz2=1.- wz1; | |
496 | crosspoint[0]=wx1*x1 + wx2*x2; | |
497 | crosspoint[1]=wy1*y1 + wy2*y2; | |
498 | crosspoint[2]=wz1*z1 + wz2*z2; | |
499 | ||
500 | ncombi++; | |
501 | for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj]; | |
502 | for(Int_t jj=0;jj<3;jj++)averquad[jj]+=(crosspoint[jj]*crosspoint[jj]); | |
503 | } | |
504 | } | |
505 | ||
506 | } | |
507 | if(ncombi>0){ | |
508 | for(Int_t jj=0;jj<3;jj++){ | |
509 | initPos[jj] = aver[jj]/ncombi; | |
510 | averquad[jj]/=ncombi; | |
511 | sigmaquad[jj]=averquad[jj]-initPos[jj]*initPos[jj]; | |
512 | sigma+=sigmaquad[jj]; | |
513 | } | |
514 | sigma=TMath::Sqrt(TMath::Abs(sigma)); | |
515 | } | |
516 | else { | |
517 | Warning("HelixVertexFinder","Finder did not succed"); | |
518 | sigma=999; | |
519 | } | |
520 | fVert.SetXYZ(initPos); | |
521 | fVert.SetDispersion(sigma); | |
522 | fVert.SetNContributors(ncombi); | |
523 | } | |
50ff0bcd | 524 | //---------------------------------------------------------------------------- |
6d8df534 | 525 | Int_t AliVertexerTracks::PrepareTracks(TObjArray &trkArrayOrig, |
526 | UShort_t *idOrig, | |
527 | Int_t optImpParCut) | |
fee9ef0d | 528 | { |
50ff0bcd | 529 | // |
530 | // Propagate tracks to initial vertex position and store them in a TObjArray | |
531 | // | |
919e537f | 532 | AliDebug(1," PrepareTracks()"); |
6d8df534 | 533 | |
534 | Int_t nTrksOrig = (Int_t)trkArrayOrig.GetEntriesFast(); | |
535 | Int_t nTrksSel = 0; | |
fee9ef0d | 536 | Double_t maxd0rphi; |
50ff0bcd | 537 | Double_t sigmaCurr[3]; |
fee9ef0d | 538 | Double_t normdistx,normdisty; |
6d8df534 | 539 | Double_t d0z0[2],covd0z0[3]; |
43c9dae1 | 540 | Double_t sigmad0; |
50ff0bcd | 541 | |
542 | AliESDVertex *initVertex = new AliESDVertex(fNominalPos,fNominalCov,1,1); | |
543 | ||
6d8df534 | 544 | if(!fTrkArraySel.IsEmpty()) fTrkArraySel.Delete(); |
50ff0bcd | 545 | |
6d8df534 | 546 | AliExternalTrackParam *track=0; |
50ff0bcd | 547 | |
f09c879d | 548 | // loop on tracks |
6d8df534 | 549 | for(Int_t i=0; i<nTrksOrig; i++) { |
550 | track = new AliExternalTrackParam(*(AliExternalTrackParam*)trkArrayOrig.At(i)); | |
f09c879d | 551 | // tgl cut |
552 | if(TMath::Abs(track->GetTgl())>fMaxTgl) { | |
919e537f | 553 | AliDebug(1,Form(" rejecting track with tgl = %f",track->GetTgl())); |
f09c879d | 554 | delete track; continue; |
6d8df534 | 555 | } |
50ff0bcd | 556 | |
18eba197 | 557 | Bool_t propagateOK = kFALSE; |
50ff0bcd | 558 | // propagate track to vertex |
43c9dae1 | 559 | if(optImpParCut<2 || fOnlyFitter) { // optImpParCut==1 or 0 |
18eba197 | 560 | propagateOK = track->PropagateToDCA(initVertex,GetFieldkG(),100.,d0z0,covd0z0); |
fee9ef0d | 561 | } else { // optImpParCut==2 |
50ff0bcd | 562 | fCurrentVertex->GetSigmaXYZ(sigmaCurr); |
fee9ef0d | 563 | normdistx = TMath::Abs(fCurrentVertex->GetXv()-fNominalPos[0])/TMath::Sqrt(sigmaCurr[0]*sigmaCurr[0]+fNominalCov[0]); |
80d36431 | 564 | normdisty = TMath::Abs(fCurrentVertex->GetYv()-fNominalPos[1])/TMath::Sqrt(sigmaCurr[1]*sigmaCurr[1]+fNominalCov[2]); |
fee9ef0d | 565 | if(normdistx < 3. && normdisty < 3. && |
80d36431 | 566 | (sigmaCurr[0]+sigmaCurr[1])<(TMath::Sqrt(fNominalCov[0])+TMath::Sqrt(fNominalCov[2]))) { |
18eba197 | 567 | propagateOK = track->PropagateToDCA(fCurrentVertex,GetFieldkG(),100.,d0z0,covd0z0); |
50ff0bcd | 568 | } else { |
18eba197 | 569 | propagateOK = track->PropagateToDCA(initVertex,GetFieldkG(),100.,d0z0,covd0z0); |
50ff0bcd | 570 | } |
571 | } | |
572 | ||
18eba197 | 573 | if(!propagateOK) { |
919e537f | 574 | AliDebug(1," rejected"); |
18eba197 | 575 | delete track; continue; |
576 | } | |
577 | ||
43c9dae1 | 578 | sigmad0 = TMath::Sqrt(covd0z0[0]); |
579 | maxd0rphi = fNSigma*sigmad0; | |
fee9ef0d | 580 | if(optImpParCut==1) maxd0rphi *= 5.; |
6b29d399 | 581 | maxd0rphi = TMath::Min(maxd0rphi,fFiducialR); |
43c9dae1 | 582 | //sigmad0z0 = TMath::Sqrt(covd0z0[0]+covd0z0[2]); // for future improvement |
583 | //maxd0z0 = 10.*fNSigma*sigmad0z0; | |
fee9ef0d | 584 | |
919e537f | 585 | AliDebug(1,Form("trk %d; id %d; |d0| = %f; d0 cut = %f; |z0| = %f; |d0|oplus|z0| = %f; d0z0 cut = %f",i,(Int_t)idOrig[i],TMath::Abs(d0z0[0]),maxd0rphi,TMath::Abs(d0z0[1]),TMath::Sqrt(d0z0[0]*d0z0[0]+d0z0[1]*d0z0[1]),fMaxd0z0)); |
f09c879d | 586 | |
587 | ||
588 | //---- track selection based on impact parameters ----// | |
589 | ||
590 | // always reject tracks outside fiducial volume | |
6b29d399 | 591 | if(TMath::Abs(d0z0[0])>fFiducialR || TMath::Abs(d0z0[1])>fFiducialZ) { |
919e537f | 592 | AliDebug(1," rejected"); |
f09c879d | 593 | delete track; continue; |
594 | } | |
595 | ||
596 | // during iterations 1 and 2 , reject tracks with d0rphi > maxd0rphi | |
597 | if(optImpParCut>0 && TMath::Abs(d0z0[0])>maxd0rphi) { | |
919e537f | 598 | AliDebug(1," rejected"); |
f09c879d | 599 | delete track; continue; |
600 | } | |
fee9ef0d | 601 | |
43c9dae1 | 602 | // if fConstraint=kFALSE, during iterations 1 and 2 || |
603 | // if fConstraint=kTRUE, during iteration 2, | |
f09c879d | 604 | // select tracks with d0oplusz0 < fMaxd0z0 |
43c9dae1 | 605 | if((!fConstraint && optImpParCut>0 && fVert.GetNContributors()>0) || |
606 | ( fConstraint && optImpParCut==2)) { | |
607 | if(nTrksOrig>=3 && | |
f09c879d | 608 | TMath::Sqrt(d0z0[0]*d0z0[0]+d0z0[1]*d0z0[1])>fMaxd0z0) { |
919e537f | 609 | AliDebug(1," rejected"); |
fee9ef0d | 610 | delete track; continue; |
611 | } | |
612 | } | |
43c9dae1 | 613 | |
f09c879d | 614 | // track passed all selections |
6d8df534 | 615 | fTrkArraySel.AddLast(track); |
616 | fIdSel[nTrksSel] = idOrig[i]; | |
617 | nTrksSel++; | |
f09c879d | 618 | } // end loop on tracks |
50ff0bcd | 619 | |
620 | delete initVertex; | |
621 | ||
6d8df534 | 622 | return nTrksSel; |
50ff0bcd | 623 | } |
f09c879d | 624 | //---------------------------------------------------------------------------- |
625 | Bool_t AliVertexerTracks::PropagateTrackTo(AliExternalTrackParam *track, | |
626 | Double_t xToGo) { | |
627 | //---------------------------------------------------------------- | |
628 | // COPIED from AliTracker | |
629 | // | |
630 | // Propagates the track to the plane X=xk (cm). | |
631 | // | |
632 | // Origin: Marian Ivanov, Marian.Ivanov@cern.ch | |
633 | //---------------------------------------------------------------- | |
634 | ||
635 | const Double_t kEpsilon = 0.00001; | |
636 | Double_t xpos = track->GetX(); | |
637 | Double_t dir = (xpos<xToGo) ? 1. : -1.; | |
638 | Double_t maxStep = 5; | |
639 | Double_t maxSnp = 0.8; | |
640 | // | |
641 | while ( (xToGo-xpos)*dir > kEpsilon){ | |
642 | Double_t step = dir*TMath::Min(TMath::Abs(xToGo-xpos), maxStep); | |
643 | Double_t x = xpos+step; | |
644 | Double_t xyz0[3],xyz1[3]; | |
645 | track->GetXYZ(xyz0); //starting global position | |
646 | ||
647 | if(!track->GetXYZAt(x,GetFieldkG(),xyz1)) return kFALSE; // no prolongation | |
648 | xyz1[2]+=kEpsilon; // waiting for bug correction in geo | |
649 | ||
650 | if(TMath::Abs(track->GetSnpAt(x,GetFieldkG())) >= maxSnp) return kFALSE; | |
651 | if(!track->PropagateTo(x,GetFieldkG())) return kFALSE; | |
652 | ||
653 | if(TMath::Abs(track->GetSnp()) >= maxSnp) return kFALSE; | |
654 | track->GetXYZ(xyz0); // global position | |
655 | Double_t alphan = TMath::ATan2(xyz0[1], xyz0[0]); | |
656 | // | |
657 | Double_t ca=TMath::Cos(alphan-track->GetAlpha()), | |
658 | sa=TMath::Sin(alphan-track->GetAlpha()); | |
659 | Double_t sf=track->GetSnp(), cf=TMath::Sqrt(1.- sf*sf); | |
660 | Double_t sinNew = sf*ca - cf*sa; | |
661 | if(TMath::Abs(sinNew) >= maxSnp) return kFALSE; | |
662 | if(!track->Rotate(alphan)) return kFALSE; | |
663 | ||
664 | xpos = track->GetX(); | |
665 | } | |
666 | return kTRUE; | |
667 | } | |
50ff0bcd | 668 | //--------------------------------------------------------------------------- |
fee9ef0d | 669 | AliESDVertex* AliVertexerTracks::RemoveTracksFromVertex(AliESDVertex *inVtx, |
6d8df534 | 670 | TObjArray *trkArray, |
671 | UShort_t *id, | |
fee9ef0d | 672 | Float_t *diamondxy) |
673 | { | |
50ff0bcd | 674 | // |
fee9ef0d | 675 | // Removes tracks in trksTree from fit of inVtx |
50ff0bcd | 676 | // |
fee9ef0d | 677 | |
146c29df | 678 | if(!strstr(inVtx->GetTitle(),"VertexerTracksWithConstraint")) { |
919e537f | 679 | printf("ERROR: primary vertex has no constraint: cannot remove tracks"); |
146c29df | 680 | return 0x0; |
681 | } | |
fee9ef0d | 682 | if(!strstr(inVtx->GetTitle(),"VertexerTracksWithConstraintOnlyFitter")) |
919e537f | 683 | printf("WARNING: result of tracks' removal will be only approximately correct"); |
fee9ef0d | 684 | |
685 | TMatrixD rv(3,1); | |
686 | rv(0,0) = inVtx->GetXv(); | |
687 | rv(1,0) = inVtx->GetYv(); | |
688 | rv(2,0) = inVtx->GetZv(); | |
689 | TMatrixD vV(3,3); | |
690 | Double_t cov[6]; | |
691 | inVtx->GetCovMatrix(cov); | |
692 | vV(0,0) = cov[0]; | |
693 | vV(0,1) = cov[1]; vV(1,0) = cov[1]; | |
694 | vV(1,1) = cov[2]; | |
695 | vV(0,2) = cov[3]; vV(2,0) = cov[3]; | |
696 | vV(1,2) = cov[4]; vV(2,1) = cov[4]; | |
697 | vV(2,2) = cov[5]; | |
698 | ||
699 | TMatrixD sumWi(TMatrixD::kInverted,vV); | |
700 | TMatrixD sumWiri(sumWi,TMatrixD::kMult,rv); | |
701 | ||
dad616ce | 702 | Int_t nUsedTrks = inVtx->GetNIndices(); |
fee9ef0d | 703 | Double_t chi2 = inVtx->GetChi2(); |
704 | ||
6d8df534 | 705 | AliExternalTrackParam *track = 0; |
706 | Int_t ntrks = (Int_t)trkArray->GetEntriesFast(); | |
fee9ef0d | 707 | for(Int_t i=0;i<ntrks;i++) { |
6d8df534 | 708 | track = (AliExternalTrackParam*)trkArray->At(i); |
709 | if(!inVtx->UsesTrack(id[i])) { | |
919e537f | 710 | printf("track %d was not used in vertex fit",id[i]); |
fee9ef0d | 711 | continue; |
712 | } | |
713 | Double_t alpha = track->GetAlpha(); | |
714 | Double_t xl = diamondxy[0]*TMath::Cos(alpha)+diamondxy[1]*TMath::Sin(alpha); | |
6d8df534 | 715 | track->PropagateTo(xl,GetFieldkG()); |
fee9ef0d | 716 | // vector of track global coordinates |
717 | TMatrixD ri(3,1); | |
718 | // covariance matrix of ri | |
719 | TMatrixD wWi(3,3); | |
720 | ||
721 | // get space point from track | |
722 | if(!TrackToPoint(track,ri,wWi)) continue; | |
723 | ||
724 | TMatrixD wWiri(wWi,TMatrixD::kMult,ri); | |
725 | ||
726 | sumWi -= wWi; | |
727 | sumWiri -= wWiri; | |
728 | ||
729 | // track chi2 | |
730 | TMatrixD deltar = rv; deltar -= ri; | |
731 | TMatrixD wWideltar(wWi,TMatrixD::kMult,deltar); | |
732 | Double_t chi2i = deltar(0,0)*wWideltar(0,0)+ | |
733 | deltar(1,0)*wWideltar(1,0)+ | |
734 | deltar(2,0)*wWideltar(2,0); | |
735 | // remove from total chi2 | |
736 | chi2 -= chi2i; | |
737 | ||
738 | nUsedTrks--; | |
739 | if(nUsedTrks<2) { | |
919e537f | 740 | printf("Trying to remove too many tracks!"); |
fee9ef0d | 741 | return 0x0; |
742 | } | |
743 | } | |
744 | ||
745 | TMatrixD rvnew(3,1); | |
746 | TMatrixD vVnew(3,3); | |
747 | ||
748 | // new inverted of weights matrix | |
749 | TMatrixD invsumWi(TMatrixD::kInverted,sumWi); | |
750 | vVnew = invsumWi; | |
751 | // new position of primary vertex | |
752 | rvnew.Mult(vVnew,sumWiri); | |
753 | ||
754 | Double_t position[3]; | |
755 | position[0] = rvnew(0,0); | |
756 | position[1] = rvnew(1,0); | |
757 | position[2] = rvnew(2,0); | |
758 | cov[0] = vVnew(0,0); | |
759 | cov[1] = vVnew(0,1); | |
760 | cov[2] = vVnew(1,1); | |
761 | cov[3] = vVnew(0,2); | |
762 | cov[4] = vVnew(1,2); | |
763 | cov[5] = vVnew(2,2); | |
764 | ||
765 | // store data in the vertex object | |
766 | AliESDVertex *outVtx = new AliESDVertex(position,cov,chi2,nUsedTrks); | |
767 | outVtx->SetTitle(inVtx->GetTitle()); | |
fee9ef0d | 768 | UShort_t *inindices = inVtx->GetIndices(); |
dad616ce | 769 | Int_t nIndices = nUsedTrks; |
4d023a8f | 770 | UShort_t *outindices = new UShort_t[nIndices]; |
fee9ef0d | 771 | Int_t j=0; |
fee9ef0d | 772 | for(Int_t k=0; k<inVtx->GetNIndices(); k++) { |
6d8df534 | 773 | Bool_t copyindex=kTRUE; |
fee9ef0d | 774 | for(Int_t l=0; l<ntrks; l++) { |
6d8df534 | 775 | if(inindices[k]==id[l]) copyindex=kFALSE; |
fee9ef0d | 776 | } |
777 | if(copyindex) { | |
778 | outindices[j] = inindices[k]; j++; | |
779 | } | |
780 | } | |
4d023a8f | 781 | outVtx->SetIndices(nIndices,outindices); |
fee9ef0d | 782 | delete [] outindices; |
783 | ||
919e537f | 784 | /* |
785 | printf("Vertex before removing tracks:"); | |
fee9ef0d | 786 | inVtx->PrintStatus(); |
787 | inVtx->PrintIndices(); | |
919e537f | 788 | printf("Vertex after removing tracks:"); |
fee9ef0d | 789 | outVtx->PrintStatus(); |
790 | outVtx->PrintIndices(); | |
919e537f | 791 | */ |
fee9ef0d | 792 | |
793 | return outVtx; | |
794 | } | |
795 | //--------------------------------------------------------------------------- | |
a00021a7 | 796 | void AliVertexerTracks::SetCuts(Double_t *cuts) |
797 | { | |
798 | // | |
799 | // Cut values | |
800 | // | |
801 | SetDCAcut(cuts[0]); | |
802 | SetDCAcutIter0(cuts[1]); | |
803 | SetMaxd0z0(cuts[2]); | |
5b78b791 | 804 | if(fMode==0 && cuts[3]<0) SetITSrefitNotRequired(); |
805 | SetMinClusters((Int_t)(TMath::Abs(cuts[3]))); | |
a00021a7 | 806 | SetMinTracks((Int_t)(cuts[4])); |
807 | SetNSigmad0(cuts[5]); | |
808 | SetMinDetFitter(cuts[6]); | |
809 | SetMaxTgl(cuts[7]); | |
810 | SetFiducialRZ(cuts[8],cuts[9]); | |
811 | ||
812 | return; | |
813 | } | |
814 | //--------------------------------------------------------------------------- | |
f09c879d | 815 | void AliVertexerTracks::SetITSMode(Double_t dcacut, |
816 | Double_t dcacutIter0, | |
817 | Double_t maxd0z0, | |
6b29d399 | 818 | Int_t minCls, |
f09c879d | 819 | Int_t mintrks, |
820 | Double_t nsigma, | |
821 | Double_t mindetfitter, | |
6b29d399 | 822 | Double_t maxtgl, |
823 | Double_t fidR, | |
824 | Double_t fidZ) | |
f09c879d | 825 | { |
826 | // | |
827 | // Cut values for ITS mode | |
828 | // | |
829 | fMode = 0; | |
5b78b791 | 830 | if(minCls>0) { |
831 | SetITSrefitRequired(); | |
832 | } else { | |
833 | SetITSrefitNotRequired(); | |
834 | } | |
f09c879d | 835 | SetDCAcut(dcacut); |
836 | SetDCAcutIter0(dcacutIter0); | |
837 | SetMaxd0z0(maxd0z0); | |
5b78b791 | 838 | SetMinClusters(TMath::Abs(minCls)); |
f09c879d | 839 | SetMinTracks(mintrks); |
840 | SetNSigmad0(nsigma); | |
841 | SetMinDetFitter(mindetfitter); | |
842 | SetMaxTgl(maxtgl); | |
6b29d399 | 843 | SetFiducialRZ(fidR,fidZ); |
f09c879d | 844 | |
845 | return; | |
846 | } | |
847 | //--------------------------------------------------------------------------- | |
848 | void AliVertexerTracks::SetTPCMode(Double_t dcacut, | |
849 | Double_t dcacutIter0, | |
850 | Double_t maxd0z0, | |
6b29d399 | 851 | Int_t minCls, |
f09c879d | 852 | Int_t mintrks, |
853 | Double_t nsigma, | |
854 | Double_t mindetfitter, | |
6b29d399 | 855 | Double_t maxtgl, |
856 | Double_t fidR, | |
857 | Double_t fidZ) | |
f09c879d | 858 | { |
859 | // | |
860 | // Cut values for TPC mode | |
861 | // | |
862 | fMode = 1; | |
863 | SetITSrefitNotRequired(); | |
864 | SetDCAcut(dcacut); | |
865 | SetDCAcutIter0(dcacutIter0); | |
866 | SetMaxd0z0(maxd0z0); | |
6b29d399 | 867 | SetMinClusters(minCls); |
f09c879d | 868 | SetMinTracks(mintrks); |
869 | SetNSigmad0(nsigma); | |
870 | SetMinDetFitter(mindetfitter); | |
871 | SetMaxTgl(maxtgl); | |
6b29d399 | 872 | SetFiducialRZ(fidR,fidZ); |
f09c879d | 873 | |
874 | return; | |
875 | } | |
876 | //--------------------------------------------------------------------------- | |
fee9ef0d | 877 | void AliVertexerTracks::SetSkipTracks(Int_t n,Int_t *skipped) |
878 | { | |
879 | // | |
880 | // Mark the tracks not to be used in the vertex reconstruction. | |
881 | // Tracks are identified by AliESDtrack::GetID() | |
882 | // | |
883 | fNTrksToSkip = n; fTrksToSkip = new Int_t[n]; | |
50ff0bcd | 884 | for(Int_t i=0;i<n;i++) fTrksToSkip[i] = skipped[i]; |
885 | return; | |
886 | } | |
887 | //--------------------------------------------------------------------------- | |
fee9ef0d | 888 | void AliVertexerTracks::SetVtxStart(AliESDVertex *vtx) |
889 | { | |
50ff0bcd | 890 | // |
891 | // Set initial vertex knowledge | |
892 | // | |
893 | vtx->GetXYZ(fNominalPos); | |
894 | vtx->GetCovMatrix(fNominalCov); | |
fee9ef0d | 895 | SetConstraintOn(); |
50ff0bcd | 896 | return; |
897 | } | |
2d57349e | 898 | //--------------------------------------------------------------------------- |
fee9ef0d | 899 | void AliVertexerTracks::StrLinVertexFinderMinDist(Int_t optUseWeights) |
dc3719f3 | 900 | { |
6d8df534 | 901 | AliExternalTrackParam *track1; |
6d8df534 | 902 | const Int_t knacc = (Int_t)fTrkArraySel.GetEntriesFast(); |
f54bad66 | 903 | static TClonesArray linarray("AliStrLine",knacc); |
dc3719f3 | 904 | for(Int_t i=0; i<knacc; i++){ |
6d8df534 | 905 | track1 = (AliExternalTrackParam*)fTrkArraySel.At(i); |
dc3719f3 | 906 | Double_t alpha=track1->GetAlpha(); |
907 | Double_t mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; | |
908 | Double_t pos[3],dir[3],sigmasq[3]; | |
f09c879d | 909 | track1->GetXYZAt(mindist,GetFieldkG(),pos); |
910 | track1->GetPxPyPzAt(mindist,GetFieldkG(),dir); | |
dc3719f3 | 911 | sigmasq[0]=TMath::Sin(alpha)*TMath::Sin(alpha)*track1->GetSigmaY2(); |
912 | sigmasq[1]=TMath::Cos(alpha)*TMath::Cos(alpha)*track1->GetSigmaY2(); | |
913 | sigmasq[2]=track1->GetSigmaZ2(); | |
146c29df | 914 | TMatrixD ri(3,1); |
915 | TMatrixD wWi(3,3); | |
916 | if(!TrackToPoint(track1,ri,wWi)) continue; | |
917 | Double_t wmat[9]; | |
918 | Int_t iel=0; | |
919 | for(Int_t ia=0;ia<3;ia++){ | |
920 | for(Int_t ib=0;ib<3;ib++){ | |
921 | wmat[iel]=wWi(ia,ib); | |
922 | iel++; | |
923 | } | |
924 | } | |
f54bad66 | 925 | new(linarray[i]) AliStrLine(pos,sigmasq,wmat,dir); |
dc3719f3 | 926 | } |
f54bad66 | 927 | fVert=TrackletVertexFinder(&linarray,optUseWeights); |
928 | linarray.Clear("C"); | |
dc3719f3 | 929 | } |
930 | //--------------------------------------------------------------------------- | |
146c29df | 931 | AliESDVertex AliVertexerTracks::TrackletVertexFinder(TClonesArray *lines, Int_t optUseWeights) |
fee9ef0d | 932 | { |
2d57349e | 933 | // Calculate the point at minimum distance to prepared tracks |
934 | ||
dc3719f3 | 935 | const Int_t knacc = (Int_t)lines->GetEntriesFast(); |
936 | Double_t initPos[3]={0.,0.,0.}; | |
2d57349e | 937 | |
2d57349e | 938 | Double_t (*vectP0)[3]=new Double_t [knacc][3]; |
939 | Double_t (*vectP1)[3]=new Double_t [knacc][3]; | |
940 | ||
941 | Double_t sum[3][3]; | |
942 | Double_t dsum[3]={0,0,0}; | |
146c29df | 943 | TMatrixD sumWi(3,3); |
944 | for(Int_t i=0;i<3;i++){ | |
945 | for(Int_t j=0;j<3;j++){ | |
946 | sum[i][j]=0; | |
947 | sumWi(i,j)=0.; | |
948 | } | |
949 | } | |
950 | ||
2d57349e | 951 | for(Int_t i=0; i<knacc; i++){ |
f54bad66 | 952 | AliStrLine* line1 = (AliStrLine*)lines->At(i); |
dc3719f3 | 953 | Double_t p0[3],cd[3],sigmasq[3]; |
146c29df | 954 | Double_t wmat[9]; |
2d57349e | 955 | line1->GetP0(p0); |
956 | line1->GetCd(cd); | |
dc3719f3 | 957 | line1->GetSigma2P0(sigmasq); |
146c29df | 958 | line1->GetWMatrix(wmat); |
959 | TMatrixD wWi(3,3); | |
960 | Int_t iel=0; | |
961 | for(Int_t ia=0;ia<3;ia++){ | |
962 | for(Int_t ib=0;ib<3;ib++){ | |
963 | wWi(ia,ib)=wmat[iel]; | |
964 | iel++; | |
965 | } | |
966 | } | |
967 | ||
968 | sumWi+=wWi; | |
969 | ||
2d57349e | 970 | Double_t p1[3]={p0[0]+cd[0],p0[1]+cd[1],p0[2]+cd[2]}; |
971 | vectP0[i][0]=p0[0]; | |
972 | vectP0[i][1]=p0[1]; | |
973 | vectP0[i][2]=p0[2]; | |
974 | vectP1[i][0]=p1[0]; | |
975 | vectP1[i][1]=p1[1]; | |
976 | vectP1[i][2]=p1[2]; | |
977 | ||
978 | Double_t matr[3][3]; | |
979 | Double_t dknow[3]; | |
980 | if(optUseWeights==0)GetStrLinDerivMatrix(p0,p1,matr,dknow); | |
dc3719f3 | 981 | else GetStrLinDerivMatrix(p0,p1,sigmasq,matr,dknow); |
982 | ||
2d57349e | 983 | |
984 | for(Int_t iii=0;iii<3;iii++){ | |
985 | dsum[iii]+=dknow[iii]; | |
986 | for(Int_t lj=0;lj<3;lj++) sum[iii][lj]+=matr[iii][lj]; | |
987 | } | |
2d57349e | 988 | } |
146c29df | 989 | |
990 | TMatrixD invsumWi(TMatrixD::kInverted,sumWi); | |
991 | Double_t covmatrix[6]; | |
992 | covmatrix[0] = invsumWi(0,0); | |
993 | covmatrix[1] = invsumWi(0,1); | |
994 | covmatrix[2] = invsumWi(1,1); | |
995 | covmatrix[3] = invsumWi(0,2); | |
996 | covmatrix[4] = invsumWi(1,2); | |
997 | covmatrix[5] = invsumWi(2,2); | |
998 | ||
2d57349e | 999 | Double_t vett[3][3]; |
1000 | Double_t det=GetDeterminant3X3(sum); | |
dc3719f3 | 1001 | Double_t sigma=0; |
2d57349e | 1002 | |
fee9ef0d | 1003 | if(det!=0){ |
1004 | for(Int_t zz=0;zz<3;zz++){ | |
1005 | for(Int_t ww=0;ww<3;ww++){ | |
1006 | for(Int_t kk=0;kk<3;kk++) vett[ww][kk]=sum[ww][kk]; | |
1007 | } | |
1008 | for(Int_t kk=0;kk<3;kk++) vett[kk][zz]=dsum[kk]; | |
1009 | initPos[zz]=GetDeterminant3X3(vett)/det; | |
1010 | } | |
1011 | ||
1012 | ||
1013 | for(Int_t i=0; i<knacc; i++){ | |
1014 | Double_t p0[3]={0,0,0},p1[3]={0,0,0}; | |
1015 | for(Int_t ii=0;ii<3;ii++){ | |
1016 | p0[ii]=vectP0[i][ii]; | |
1017 | p1[ii]=vectP1[i][ii]; | |
1018 | } | |
1019 | sigma+=GetStrLinMinDist(p0,p1,initPos); | |
1020 | } | |
1021 | ||
f09c879d | 1022 | if(sigma>0.) {sigma=TMath::Sqrt(sigma);}else{sigma=999;} |
fee9ef0d | 1023 | }else{ |
50ff0bcd | 1024 | sigma=999; |
1025 | } | |
146c29df | 1026 | AliESDVertex theVert(initPos,covmatrix,99999.,knacc); |
1027 | theVert.SetDispersion(sigma); | |
50ff0bcd | 1028 | delete vectP0; |
1029 | delete vectP1; | |
dc3719f3 | 1030 | return theVert; |
50ff0bcd | 1031 | } |
1032 | //--------------------------------------------------------------------------- | |
6d8df534 | 1033 | Bool_t AliVertexerTracks::TrackToPoint(AliExternalTrackParam *t, |
0bf2e2b4 | 1034 | TMatrixD &ri,TMatrixD &wWi, |
1035 | Bool_t uUi3by3) const | |
fee9ef0d | 1036 | { |
1037 | // | |
6d8df534 | 1038 | // Extract from the AliExternalTrackParam the global coordinates ri and covariance matrix |
fee9ef0d | 1039 | // wWi of the space point that it represents (to be used in VertexFitter()) |
1040 | // | |
1041 | ||
1042 | ||
1043 | Double_t rotAngle = t->GetAlpha(); | |
1044 | if(rotAngle<0.) rotAngle += 2.*TMath::Pi(); | |
1045 | Double_t cosRot = TMath::Cos(rotAngle); | |
1046 | Double_t sinRot = TMath::Sin(rotAngle); | |
1047 | ||
1048 | ri(0,0) = t->GetX()*cosRot-t->GetY()*sinRot; | |
1049 | ri(1,0) = t->GetX()*sinRot+t->GetY()*cosRot; | |
1050 | ri(2,0) = t->GetZ(); | |
1051 | ||
0bf2e2b4 | 1052 | |
1053 | ||
1054 | if(!uUi3by3) { | |
1055 | // matrix to go from global (x,y,z) to local (y,z); | |
1056 | TMatrixD qQi(2,3); | |
1057 | qQi(0,0) = -sinRot; | |
1058 | qQi(0,1) = cosRot; | |
1059 | qQi(0,2) = 0.; | |
1060 | qQi(1,0) = 0.; | |
1061 | qQi(1,1) = 0.; | |
1062 | qQi(1,2) = 1.; | |
1063 | ||
1064 | // covariance matrix of local (y,z) - inverted | |
0bf2e2b4 | 1065 | TMatrixD uUi(2,2); |
6d8df534 | 1066 | uUi(0,0) = t->GetSigmaY2(); |
1067 | uUi(0,1) = t->GetSigmaZY(); | |
1068 | uUi(1,0) = t->GetSigmaZY(); | |
1069 | uUi(1,1) = t->GetSigmaZ2(); | |
919e537f | 1070 | //printf(" Ui :"); |
1071 | //printf(" %f %f",uUi(0,0),uUi(0,1)); | |
1072 | //printf(" %f %f",uUi(1,0),uUi(1,1)); | |
0bf2e2b4 | 1073 | |
1074 | if(uUi.Determinant() <= 0.) return kFALSE; | |
1075 | TMatrixD uUiInv(TMatrixD::kInverted,uUi); | |
1076 | ||
1077 | // weights matrix: wWi = qQiT * uUiInv * qQi | |
1078 | TMatrixD uUiInvQi(uUiInv,TMatrixD::kMult,qQi); | |
1079 | TMatrixD m(qQi,TMatrixD::kTransposeMult,uUiInvQi); | |
1080 | wWi = m; | |
1081 | } else { | |
1082 | if(fVert.GetNContributors()<1) AliFatal("Vertex from finder is empty"); | |
1083 | // matrix to go from global (x,y,z) to local (x,y,z); | |
1084 | TMatrixD qQi(3,3); | |
1085 | qQi(0,0) = cosRot; | |
1086 | qQi(0,1) = sinRot; | |
1087 | qQi(0,2) = 0.; | |
1088 | qQi(1,0) = -sinRot; | |
1089 | qQi(1,1) = cosRot; | |
1090 | qQi(1,2) = 0.; | |
1091 | qQi(2,0) = 0.; | |
1092 | qQi(2,1) = 0.; | |
1093 | qQi(2,2) = 1.; | |
1094 | ||
1095 | // covariance of fVert along the track | |
1096 | Double_t p[3],pt,ptot; | |
1097 | t->GetPxPyPz(p); | |
1098 | pt = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]); | |
1099 | ptot = TMath::Sqrt(pt*pt+p[2]*p[2]); | |
3b768a1d | 1100 | Double_t cphi = p[0]/pt; //cos(phi)=px/pt |
1101 | Double_t sphi = p[1]/pt; //sin(phi)=py/pt | |
1102 | Double_t clambda = pt/ptot; //cos(lambda)=pt/ptot | |
1103 | Double_t slambda = p[2]/ptot; //sin(lambda)=pz/ptot | |
0bf2e2b4 | 1104 | Double_t covfVert[6]; |
1105 | fVert.GetCovMatrix(covfVert); | |
1106 | Double_t covfVertalongt = | |
3b768a1d | 1107 | covfVert[0]*cphi*cphi*clambda*clambda |
1108 | +covfVert[1]*2.*cphi*sphi*clambda*clambda | |
1109 | +covfVert[3]*2.*cphi*clambda*slambda | |
1110 | +covfVert[2]*sphi*sphi*clambda*clambda | |
1111 | +covfVert[4]*2.*sphi*clambda*slambda | |
1112 | +covfVert[5]*slambda*slambda; | |
0bf2e2b4 | 1113 | // covariance matrix of local (x,y,z) - inverted |
1114 | TMatrixD uUi(3,3); | |
3b768a1d | 1115 | uUi(0,0) = covfVertalongt * fnSigmaForUi00 * fnSigmaForUi00; |
919e537f | 1116 | AliDebug(1,Form("=====> sqrtUi00 cm %f",TMath::Sqrt(uUi(0,0)))); |
0bf2e2b4 | 1117 | uUi(0,1) = 0.; |
1118 | uUi(0,2) = 0.; | |
1119 | uUi(1,0) = 0.; | |
6d8df534 | 1120 | uUi(1,1) = t->GetSigmaY2(); |
1121 | uUi(1,2) = t->GetSigmaZY(); | |
0bf2e2b4 | 1122 | uUi(2,0) = 0.; |
6d8df534 | 1123 | uUi(2,1) = t->GetSigmaZY(); |
1124 | uUi(2,2) = t->GetSigmaZ2(); | |
0bf2e2b4 | 1125 | //printf(" Ui :\n"); |
1126 | //printf(" %f %f\n",uUi(0,0),uUi(0,1)); | |
1127 | //printf(" %f %f\n",uUi(1,0),uUi(1,1)); | |
fee9ef0d | 1128 | |
0bf2e2b4 | 1129 | if(uUi.Determinant() <= 0.) return kFALSE; |
1130 | TMatrixD uUiInv(TMatrixD::kInverted,uUi); | |
1131 | ||
1132 | // weights matrix: wWi = qQiT * uUiInv * qQi | |
1133 | TMatrixD uUiInvQi(uUiInv,TMatrixD::kMult,qQi); | |
1134 | TMatrixD m(qQi,TMatrixD::kTransposeMult,uUiInvQi); | |
1135 | wWi = m; | |
1136 | } | |
1137 | ||
fee9ef0d | 1138 | |
1139 | return kTRUE; | |
1140 | } | |
1141 | //--------------------------------------------------------------------------- | |
6d8df534 | 1142 | void AliVertexerTracks::TooFewTracks() |
fee9ef0d | 1143 | { |
50ff0bcd | 1144 | // |
6d8df534 | 1145 | // When the number of tracks is < fMinTracks, |
1146 | // deal with vertices not found and prepare to exit | |
50ff0bcd | 1147 | // |
919e537f | 1148 | AliDebug(1,"TooFewTracks"); |
2d57349e | 1149 | |
50ff0bcd | 1150 | Double_t pos[3],err[3]; |
50ff0bcd | 1151 | pos[0] = fNominalPos[0]; |
1152 | err[0] = TMath::Sqrt(fNominalCov[0]); | |
1153 | pos[1] = fNominalPos[1]; | |
1154 | err[1] = TMath::Sqrt(fNominalCov[2]); | |
6d8df534 | 1155 | pos[2] = fNominalPos[2]; |
1156 | err[2] = TMath::Sqrt(fNominalCov[5]); | |
1157 | Int_t ncontr = (err[0]>1. ? -1 : -3); | |
5b78b791 | 1158 | if(fCurrentVertex) { delete fCurrentVertex; fCurrentVertex=0; } |
50ff0bcd | 1159 | fCurrentVertex = new AliESDVertex(pos,err); |
1160 | fCurrentVertex->SetNContributors(ncontr); | |
2d57349e | 1161 | |
fee9ef0d | 1162 | if(fConstraint) { |
1163 | fCurrentVertex->SetTitle("VertexerTracksWithConstraint"); | |
1164 | } else { | |
50ff0bcd | 1165 | fCurrentVertex->SetTitle("VertexerTracksNoConstraint"); |
fee9ef0d | 1166 | } |
2d57349e | 1167 | |
6d8df534 | 1168 | if(!fTrkArraySel.IsEmpty()) fTrkArraySel.Delete(); |
1169 | if(fIdSel) {delete [] fIdSel; fIdSel=NULL;} | |
1170 | if(fTrksToSkip) {delete [] fTrksToSkip; fTrksToSkip=NULL;} | |
1171 | ||
50ff0bcd | 1172 | return; |
1173 | } | |
1174 | //--------------------------------------------------------------------------- | |
fee9ef0d | 1175 | void AliVertexerTracks::VertexFinder(Int_t optUseWeights) |
1176 | { | |
2d57349e | 1177 | |
50ff0bcd | 1178 | // Get estimate of vertex position in (x,y) from tracks DCA |
1179 | ||
1180 | Double_t initPos[3]; | |
1181 | initPos[2] = 0.; | |
1182 | for(Int_t i=0;i<2;i++)initPos[i]=fNominalPos[i]; | |
6d8df534 | 1183 | Int_t nacc = (Int_t)fTrkArraySel.GetEntriesFast(); |
50ff0bcd | 1184 | Double_t aver[3]={0.,0.,0.}; |
1185 | Double_t aversq[3]={0.,0.,0.}; | |
1186 | Double_t sigmasq[3]={0.,0.,0.}; | |
1187 | Double_t sigma=0; | |
1188 | Int_t ncombi = 0; | |
6d8df534 | 1189 | AliExternalTrackParam *track1; |
1190 | AliExternalTrackParam *track2; | |
50ff0bcd | 1191 | Double_t pos[3],dir[3]; |
1192 | Double_t alpha,mindist; | |
2d57349e | 1193 | |
50ff0bcd | 1194 | for(Int_t i=0; i<nacc; i++){ |
6d8df534 | 1195 | track1 = (AliExternalTrackParam*)fTrkArraySel.At(i); |
50ff0bcd | 1196 | alpha=track1->GetAlpha(); |
1197 | mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; | |
f09c879d | 1198 | track1->GetXYZAt(mindist,GetFieldkG(),pos); |
1199 | track1->GetPxPyPzAt(mindist,GetFieldkG(),dir); | |
50ff0bcd | 1200 | AliStrLine *line1 = new AliStrLine(pos,dir); |
2d57349e | 1201 | |
50ff0bcd | 1202 | // AliStrLine *line1 = new AliStrLine(); |
f09c879d | 1203 | // track1->ApproximateHelixWithLine(mindist,GetFieldkG(),line1); |
50ff0bcd | 1204 | |
1205 | for(Int_t j=i+1; j<nacc; j++){ | |
6d8df534 | 1206 | track2 = (AliExternalTrackParam*)fTrkArraySel.At(j); |
50ff0bcd | 1207 | alpha=track2->GetAlpha(); |
1208 | mindist = TMath::Cos(alpha)*fNominalPos[0]+TMath::Sin(alpha)*fNominalPos[1]; | |
f09c879d | 1209 | track2->GetXYZAt(mindist,GetFieldkG(),pos); |
1210 | track2->GetPxPyPzAt(mindist,GetFieldkG(),dir); | |
50ff0bcd | 1211 | AliStrLine *line2 = new AliStrLine(pos,dir); |
1212 | // AliStrLine *line2 = new AliStrLine(); | |
f09c879d | 1213 | // track2->ApproximateHelixWithLine(mindist,GetFieldkG(),line2); |
50ff0bcd | 1214 | Double_t distCA=line2->GetDCA(line1); |
fee9ef0d | 1215 | //printf("%d %d %f\n",i,j,distCA); |
1216 | if(fDCAcut<=0 || (fDCAcut>0&&distCA<fDCAcut)){ | |
50ff0bcd | 1217 | Double_t pnt1[3],pnt2[3],crosspoint[3]; |
2d57349e | 1218 | |
50ff0bcd | 1219 | if(optUseWeights<=0){ |
1220 | Int_t retcode = line2->Cross(line1,crosspoint); | |
1221 | if(retcode>=0){ | |
1222 | ncombi++; | |
1223 | for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj]; | |
1224 | for(Int_t jj=0;jj<3;jj++)aversq[jj]+=(crosspoint[jj]*crosspoint[jj]); | |
1225 | } | |
1226 | } | |
1227 | if(optUseWeights>0){ | |
1228 | Int_t retcode = line1->CrossPoints(line2,pnt1,pnt2); | |
1229 | if(retcode>=0){ | |
5c03260f | 1230 | Double_t cs, sn; |
50ff0bcd | 1231 | alpha=track1->GetAlpha(); |
1232 | cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); | |
1233 | Double_t sx1=sn*sn*track1->GetSigmaY2(), sy1=cs*cs*track1->GetSigmaY2(); | |
1234 | alpha=track2->GetAlpha(); | |
1235 | cs=TMath::Cos(alpha); sn=TMath::Sin(alpha); | |
1236 | Double_t sx2=sn*sn*track2->GetSigmaY2(), sy2=cs*cs*track2->GetSigmaY2(); | |
1237 | Double_t sz1=track1->GetSigmaZ2(), sz2=track2->GetSigmaZ2(); | |
1238 | Double_t wx1=sx2/(sx1+sx2), wx2=1.- wx1; | |
1239 | Double_t wy1=sy2/(sy1+sy2), wy2=1.- wy1; | |
1240 | Double_t wz1=sz2/(sz1+sz2), wz2=1.- wz1; | |
1241 | crosspoint[0]=wx1*pnt1[0] + wx2*pnt2[0]; | |
1242 | crosspoint[1]=wy1*pnt1[1] + wy2*pnt2[1]; | |
1243 | crosspoint[2]=wz1*pnt1[2] + wz2*pnt2[2]; | |
1244 | ||
1245 | ncombi++; | |
1246 | for(Int_t jj=0;jj<3;jj++)aver[jj]+=crosspoint[jj]; | |
1247 | for(Int_t jj=0;jj<3;jj++)aversq[jj]+=(crosspoint[jj]*crosspoint[jj]); | |
1248 | } | |
1249 | } | |
1250 | } | |
1251 | delete line2; | |
1252 | } | |
1253 | delete line1; | |
71d84967 | 1254 | } |
50ff0bcd | 1255 | if(ncombi>0){ |
1256 | for(Int_t jj=0;jj<3;jj++){ | |
1257 | initPos[jj] = aver[jj]/ncombi; | |
fee9ef0d | 1258 | //printf("%f\n",initPos[jj]); |
50ff0bcd | 1259 | aversq[jj]/=ncombi; |
1260 | sigmasq[jj]=aversq[jj]-initPos[jj]*initPos[jj]; | |
1261 | sigma+=sigmasq[jj]; | |
1262 | } | |
1263 | sigma=TMath::Sqrt(TMath::Abs(sigma)); | |
1264 | } | |
1265 | else { | |
1266 | Warning("VertexFinder","Finder did not succed"); | |
1267 | sigma=999; | |
1268 | } | |
1269 | fVert.SetXYZ(initPos); | |
1270 | fVert.SetDispersion(sigma); | |
1271 | fVert.SetNContributors(ncombi); | |
2d57349e | 1272 | } |
ec1be5d5 | 1273 | //--------------------------------------------------------------------------- |
6d8df534 | 1274 | void AliVertexerTracks::VertexFitter() |
fee9ef0d | 1275 | { |
ec1be5d5 | 1276 | // |
1277 | // The optimal estimate of the vertex position is given by a "weighted | |
0bf2e2b4 | 1278 | // average of tracks positions". |
fee9ef0d | 1279 | // Original method: V. Karimaki, CMS Note 97/0051 |
ec1be5d5 | 1280 | // |
6d8df534 | 1281 | Bool_t useConstraint = fConstraint; |
ec1be5d5 | 1282 | Double_t initPos[3]; |
0bf2e2b4 | 1283 | if(!fOnlyFitter) { |
1284 | fVert.GetXYZ(initPos); | |
1285 | } else { | |
1286 | initPos[0]=fNominalPos[0]; | |
1287 | initPos[1]=fNominalPos[1]; | |
1288 | initPos[2]=fNominalPos[2]; | |
1289 | } | |
1290 | ||
6d8df534 | 1291 | Int_t nTrksSel = (Int_t)fTrkArraySel.GetEntries(); |
1292 | if(nTrksSel==1) useConstraint=kTRUE; | |
919e537f | 1293 | AliDebug(1,"--- VertexFitter(): start"); |
1294 | AliDebug(1,Form(" Number of tracks in array: %d\n",nTrksSel)); | |
1295 | AliDebug(1,Form(" Minimum # tracks required in fit: %d\n",fMinTracks)); | |
1296 | AliDebug(1,Form(" Vertex position after finder: %f,%f,%f\n",initPos[0],initPos[1],initPos[2])); | |
1297 | if(useConstraint) AliDebug(1,Form(" This vertex will be used in fit: (%f+-%f,%f+-%f)\n",fNominalPos[0],TMath::Sqrt(fNominalCov[0]),fNominalPos[1],TMath::Sqrt(fNominalCov[2]))); | |
ec1be5d5 | 1298 | |
0bf2e2b4 | 1299 | // special treatment for few-tracks fits (e.g. secondary vertices) |
6d8df534 | 1300 | Bool_t uUi3by3 = kFALSE; if(nTrksSel<5 && !useConstraint) uUi3by3 = kTRUE; |
0bf2e2b4 | 1301 | |
ec1be5d5 | 1302 | Int_t i,j,k,step=0; |
1303 | TMatrixD rv(3,1); | |
1304 | TMatrixD vV(3,3); | |
1305 | rv(0,0) = initPos[0]; | |
1306 | rv(1,0) = initPos[1]; | |
1307 | rv(2,0) = 0.; | |
1308 | Double_t xlStart,alpha; | |
6d8df534 | 1309 | Int_t nTrksUsed; |
fee9ef0d | 1310 | Double_t chi2,chi2i,chi2b; |
6d8df534 | 1311 | AliExternalTrackParam *t = 0; |
ec1be5d5 | 1312 | Int_t failed = 0; |
1313 | ||
50ff0bcd | 1314 | // initial vertex covariance matrix |
1315 | TMatrixD vVb(3,3); | |
1316 | vVb(0,0) = fNominalCov[0]; | |
1317 | vVb(0,1) = fNominalCov[1]; | |
1318 | vVb(0,2) = 0.; | |
1319 | vVb(1,0) = fNominalCov[1]; | |
1320 | vVb(1,1) = fNominalCov[2]; | |
1321 | vVb(1,2) = 0.; | |
1322 | vVb(2,0) = 0.; | |
1323 | vVb(2,1) = 0.; | |
1324 | vVb(2,2) = fNominalCov[5]; | |
1325 | TMatrixD vVbInv(TMatrixD::kInverted,vVb); | |
1326 | TMatrixD rb(3,1); | |
1327 | rb(0,0) = fNominalPos[0]; | |
1328 | rb(1,0) = fNominalPos[1]; | |
1329 | rb(2,0) = fNominalPos[2]; | |
1330 | TMatrixD vVbInvrb(vVbInv,TMatrixD::kMult,rb); | |
1331 | ||
1332 | ||
eae1677e | 1333 | // 2 steps: |
1334 | // 1st - estimate of vtx using all tracks | |
1335 | // 2nd - estimate of global chi2 | |
1336 | for(step=0; step<2; step++) { | |
919e537f | 1337 | AliDebug(1,Form(" step = %d\n",step)); |
ec1be5d5 | 1338 | chi2 = 0.; |
6d8df534 | 1339 | nTrksUsed = 0; |
ec1be5d5 | 1340 | |
0bf2e2b4 | 1341 | if(step==1) { initPos[0]=rv(0,0); initPos[0]=rv(1,0); } |
1342 | ||
ec1be5d5 | 1343 | TMatrixD sumWiri(3,1); |
1344 | TMatrixD sumWi(3,3); | |
1345 | for(i=0; i<3; i++) { | |
1346 | sumWiri(i,0) = 0.; | |
1347 | for(j=0; j<3; j++) sumWi(j,i) = 0.; | |
1348 | } | |
1349 | ||
fee9ef0d | 1350 | // mean vertex constraint |
1351 | if(useConstraint) { | |
50ff0bcd | 1352 | for(i=0;i<3;i++) { |
1353 | sumWiri(i,0) += vVbInvrb(i,0); | |
1354 | for(k=0;k<3;k++) sumWi(i,k) += vVbInv(i,k); | |
07680cae | 1355 | } |
fee9ef0d | 1356 | // chi2 |
1357 | TMatrixD deltar = rv; deltar -= rb; | |
1358 | TMatrixD vVbInvdeltar(vVbInv,TMatrixD::kMult,deltar); | |
1359 | chi2b = deltar(0,0)*vVbInvdeltar(0,0)+ | |
1360 | deltar(1,0)*vVbInvdeltar(1,0)+ | |
1361 | deltar(2,0)*vVbInvdeltar(2,0); | |
1362 | chi2 += chi2b; | |
07680cae | 1363 | } |
1364 | ||
ec1be5d5 | 1365 | // loop on tracks |
6d8df534 | 1366 | for(k=0; k<nTrksSel; k++) { |
ec1be5d5 | 1367 | // get track from track array |
6d8df534 | 1368 | t = (AliExternalTrackParam*)fTrkArraySel.At(k); |
ec1be5d5 | 1369 | alpha = t->GetAlpha(); |
1370 | xlStart = initPos[0]*TMath::Cos(alpha)+initPos[1]*TMath::Sin(alpha); | |
fee9ef0d | 1371 | // to vtxSeed (from finder) |
6d8df534 | 1372 | t->PropagateTo(xlStart,GetFieldkG()); |
fee9ef0d | 1373 | |
ec1be5d5 | 1374 | // vector of track global coordinates |
1375 | TMatrixD ri(3,1); | |
fee9ef0d | 1376 | // covariance matrix of ri |
1377 | TMatrixD wWi(3,3); | |
1378 | ||
1379 | // get space point from track | |
0bf2e2b4 | 1380 | if(!TrackToPoint(t,ri,wWi,uUi3by3)) continue; |
fee9ef0d | 1381 | TMatrixD wWiri(wWi,TMatrixD::kMult,ri); |
ec1be5d5 | 1382 | |
1383 | // track chi2 | |
1384 | TMatrixD deltar = rv; deltar -= ri; | |
1385 | TMatrixD wWideltar(wWi,TMatrixD::kMult,deltar); | |
1386 | chi2i = deltar(0,0)*wWideltar(0,0)+ | |
1387 | deltar(1,0)*wWideltar(1,0)+ | |
1388 | deltar(2,0)*wWideltar(2,0); | |
1389 | ||
ec1be5d5 | 1390 | // add to total chi2 |
1391 | chi2 += chi2i; | |
1392 | ||
ec1be5d5 | 1393 | sumWiri += wWiri; |
1394 | sumWi += wWi; | |
1395 | ||
6d8df534 | 1396 | nTrksUsed++; |
ec1be5d5 | 1397 | } // end loop on tracks |
1398 | ||
6d8df534 | 1399 | if(nTrksUsed < fMinTracks) { |
ec1be5d5 | 1400 | failed=1; |
1401 | continue; | |
1402 | } | |
1403 | ||
1404 | Double_t determinant = sumWi.Determinant(); | |
f09c879d | 1405 | if(determinant < fMinDetFitter) { |
919e537f | 1406 | AliDebug(1,Form("det(V) = %f (<%f)\n",determinant,fMinDetFitter)); |
ec1be5d5 | 1407 | failed=1; |
1408 | continue; | |
1409 | } | |
1410 | ||
0bf2e2b4 | 1411 | if(step==0) { |
1412 | // inverted of weights matrix | |
1413 | TMatrixD invsumWi(TMatrixD::kInverted,sumWi); | |
1414 | vV = invsumWi; | |
1415 | // position of primary vertex | |
1416 | rv.Mult(vV,sumWiri); | |
1417 | } | |
eae1677e | 1418 | } // end loop on the 2 steps |
ec1be5d5 | 1419 | |
ec1be5d5 | 1420 | if(failed) { |
6d8df534 | 1421 | TooFewTracks(); |
ec1be5d5 | 1422 | return; |
1423 | } | |
1424 | ||
1425 | Double_t position[3]; | |
1426 | position[0] = rv(0,0); | |
1427 | position[1] = rv(1,0); | |
1428 | position[2] = rv(2,0); | |
1429 | Double_t covmatrix[6]; | |
1430 | covmatrix[0] = vV(0,0); | |
1431 | covmatrix[1] = vV(0,1); | |
1432 | covmatrix[2] = vV(1,1); | |
1433 | covmatrix[3] = vV(0,2); | |
1434 | covmatrix[4] = vV(1,2); | |
1435 | covmatrix[5] = vV(2,2); | |
1436 | ||
dc3719f3 | 1437 | // for correct chi2/ndf, count constraint as additional "track" |
6d8df534 | 1438 | if(fConstraint) nTrksUsed++; |
ec1be5d5 | 1439 | // store data in the vertex object |
5b78b791 | 1440 | if(fCurrentVertex) { delete fCurrentVertex; fCurrentVertex=0; } |
6d8df534 | 1441 | fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nTrksUsed); |
ec1be5d5 | 1442 | |
919e537f | 1443 | AliDebug(1," Vertex after fit:"); |
1444 | AliDebug(1,Form("xyz: %f %f %f; nc %d",fCurrentVertex->GetXv(),fCurrentVertex->GetYv(),fCurrentVertex->GetZv(),fCurrentVertex->GetNContributors())); | |
1445 | AliDebug(1,"--- VertexFitter(): finish\n"); | |
1446 | ||
ec1be5d5 | 1447 | |
1448 | return; | |
1449 | } | |
50ff0bcd | 1450 | //---------------------------------------------------------------------------- |
6d8df534 | 1451 | AliESDVertex* AliVertexerTracks::VertexForSelectedTracks(TObjArray *trkArray, |
1452 | UShort_t *id, | |
1453 | Bool_t optUseFitter, | |
1454 | Bool_t optPropagate) | |
fee9ef0d | 1455 | { |
eae1677e | 1456 | // |
6d8df534 | 1457 | // Return vertex from tracks (AliExternalTrackParam) in array |
eae1677e | 1458 | // |
5b78b791 | 1459 | fCurrentVertex = 0; |
fee9ef0d | 1460 | SetConstraintOff(); |
1461 | ||
50ff0bcd | 1462 | // get tracks and propagate them to initial vertex position |
6d8df534 | 1463 | fIdSel = new UShort_t[(Int_t)trkArray->GetEntriesFast()]; |
1464 | Int_t nTrksSel = PrepareTracks(*trkArray,id,0); | |
1465 | if(nTrksSel < TMath::Max(2,fMinTracks)) { | |
1466 | TooFewTracks(); | |
fee9ef0d | 1467 | return fCurrentVertex; |
50ff0bcd | 1468 | } |
1469 | ||
6d8df534 | 1470 | // vertex finder |
fee9ef0d | 1471 | switch (fAlgo) { |
1472 | case 1: StrLinVertexFinderMinDist(1); break; | |
1473 | case 2: StrLinVertexFinderMinDist(0); break; | |
1474 | case 3: HelixVertexFinder(); break; | |
1475 | case 4: VertexFinder(1); break; | |
1476 | case 5: VertexFinder(0); break; | |
1477 | default: printf("Wrong algorithm\n"); break; | |
1478 | } | |
919e537f | 1479 | AliDebug(1," Vertex finding completed\n"); |
fee9ef0d | 1480 | |
1481 | // vertex fitter | |
6d8df534 | 1482 | if(optUseFitter) { |
1483 | VertexFitter(); | |
1484 | } else { | |
fee9ef0d | 1485 | Double_t position[3]={fVert.GetXv(),fVert.GetYv(),fVert.GetZv()}; |
146c29df | 1486 | Double_t covmatrix[6]; |
1487 | fVert.GetCovMatrix(covmatrix); | |
fee9ef0d | 1488 | Double_t chi2=99999.; |
6d8df534 | 1489 | Int_t nTrksUsed=fVert.GetNContributors(); |
1490 | fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nTrksUsed); | |
fee9ef0d | 1491 | } |
1492 | fCurrentVertex->SetDispersion(fVert.GetDispersion()); | |
1493 | ||
1494 | ||
1495 | // set indices of used tracks and propagate track to found vertex | |
50ff0bcd | 1496 | UShort_t *indices = 0; |
6d8df534 | 1497 | Double_t d0z0[2],covd0z0[3]; |
1498 | AliExternalTrackParam *t = 0; | |
fee9ef0d | 1499 | if(fCurrentVertex->GetNContributors()>0) { |
1500 | indices = new UShort_t[fCurrentVertex->GetNContributors()]; | |
6d8df534 | 1501 | for(Int_t jj=0; jj<(Int_t)fTrkArraySel.GetEntriesFast(); jj++) { |
1502 | indices[jj] = fIdSel[jj]; | |
1503 | t = (AliExternalTrackParam*)fTrkArraySel.At(jj); | |
1504 | if(optPropagate && optUseFitter) { | |
fee9ef0d | 1505 | if(TMath::Sqrt(fCurrentVertex->GetXv()*fCurrentVertex->GetXv()+fCurrentVertex->GetYv()*fCurrentVertex->GetYv())<3.) { |
6d8df534 | 1506 | t->PropagateToDCA(fCurrentVertex,GetFieldkG(),100.,d0z0,covd0z0); |
919e537f | 1507 | AliDebug(1,Form("Track %d propagated to found vertex",jj)); |
6d8df534 | 1508 | } else { |
fee9ef0d | 1509 | AliWarning("Found vertex outside beam pipe!"); |
1510 | } | |
1511 | } | |
50ff0bcd | 1512 | } |
fee9ef0d | 1513 | fCurrentVertex->SetIndices(fCurrentVertex->GetNContributors(),indices); |
50ff0bcd | 1514 | } |
6d8df534 | 1515 | |
1516 | // clean up | |
1517 | delete [] indices; indices=NULL; | |
1518 | delete [] fIdSel; fIdSel=NULL; | |
1519 | fTrkArraySel.Delete(); | |
50ff0bcd | 1520 | |
fee9ef0d | 1521 | return fCurrentVertex; |
eae1677e | 1522 | } |
50ff0bcd | 1523 | //---------------------------------------------------------------------------- |
6d8df534 | 1524 | AliESDVertex* AliVertexerTracks::VertexForSelectedESDTracks(TObjArray *trkArray, |
1525 | Bool_t optUseFitter, | |
1526 | Bool_t optPropagate) | |
fee9ef0d | 1527 | { |
50ff0bcd | 1528 | // |
6d8df534 | 1529 | // Return vertex from array of ESD tracks |
50ff0bcd | 1530 | // |
5834e9a1 | 1531 | |
6d8df534 | 1532 | Int_t nTrks = (Int_t)trkArray->GetEntriesFast(); |
1533 | UShort_t *id = new UShort_t[nTrks]; | |
1534 | ||
1535 | AliESDtrack *esdt = 0; | |
50ff0bcd | 1536 | for(Int_t i=0; i<nTrks; i++){ |
6d8df534 | 1537 | esdt = (AliESDtrack*)trkArray->At(i); |
1538 | id[i] = (UShort_t)esdt->GetID(); | |
50ff0bcd | 1539 | } |
1540 | ||
6d8df534 | 1541 | VertexForSelectedTracks(trkArray,id,optUseFitter,optPropagate); |
1542 | ||
1543 | delete [] id; id=NULL; | |
1544 | ||
1545 | return fCurrentVertex; | |
50ff0bcd | 1546 | } |
1547 | //-------------------------------------------------------------------------- |