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1 | /************************************************************************** | |
2 | * Copyright(c) 2006-2008, 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 | #include <TTree.h> | |
16 | #include "AliESDVertex.h" | |
17 | #include "AliLog.h" | |
18 | #include "AliStrLine.h" | |
19 | #include "AliTracker.h" | |
20 | #include "AliITSDetTypeRec.h" | |
21 | #include "AliITSRecPoint.h" | |
22 | #include "AliITSgeomTGeo.h" | |
23 | #include "AliVertexerTracks.h" | |
24 | #include "AliITSVertexer3D.h" | |
25 | #include "AliITSVertexerZ.h" | |
26 | ///////////////////////////////////////////////////////////////// | |
27 | // this class implements a method to determine | |
28 | // the 3 coordinates of the primary vertex | |
29 | // for p-p collisions | |
30 | // It can be used successfully with Pb-Pb collisions | |
31 | //////////////////////////////////////////////////////////////// | |
32 | ||
33 | ClassImp(AliITSVertexer3D) | |
34 | ||
35 | /* $Id$ */ | |
36 | ||
37 | //______________________________________________________________________ | |
38 | AliITSVertexer3D::AliITSVertexer3D():AliITSVertexer(), | |
39 | fLines("AliStrLine",1000), | |
40 | fVert3D(), | |
41 | fCoarseDiffPhiCut(0.), | |
42 | fCoarseMaxRCut(0.), | |
43 | fMaxRCut(0.), | |
44 | fZCutDiamond(0.), | |
45 | fMaxZCut(0.), | |
46 | fDCAcut(0.), | |
47 | fDiffPhiMax(0.), | |
48 | fMeanPSelTrk(0.), | |
49 | fMeanPtSelTrk(0.) | |
50 | { | |
51 | // Default constructor | |
52 | SetCoarseDiffPhiCut(); | |
53 | SetCoarseMaxRCut(); | |
54 | SetMaxRCut(); | |
55 | SetZCutDiamond(); | |
56 | SetMaxZCut(); | |
57 | SetDCACut(); | |
58 | SetDiffPhiMax(); | |
59 | SetMeanPSelTracks(); | |
60 | SetMeanPtSelTracks(); | |
61 | } | |
62 | ||
63 | //______________________________________________________________________ | |
64 | AliITSVertexer3D::~AliITSVertexer3D() { | |
65 | // Destructor | |
66 | fLines.Clear("C"); | |
67 | } | |
68 | ||
69 | //______________________________________________________________________ | |
70 | void AliITSVertexer3D::ResetVert3D(){ | |
71 | // | |
72 | fVert3D.SetXv(0.); | |
73 | fVert3D.SetYv(0.); | |
74 | fVert3D.SetZv(0.); | |
75 | fVert3D.SetDispersion(0.); | |
76 | fVert3D.SetNContributors(0); | |
77 | } | |
78 | //______________________________________________________________________ | |
79 | AliESDVertex* AliITSVertexer3D::FindVertexForCurrentEvent(TTree *itsClusterTree){ | |
80 | // Defines the AliESDVertex for the current event | |
81 | ResetVert3D(); | |
82 | AliDebug(1,"FindVertexForCurrentEvent - 3D - PROCESSING NEXT EVENT"); | |
83 | fLines.Clear(); | |
84 | ||
85 | Int_t nolines = FindTracklets(itsClusterTree,0); | |
86 | fCurrentVertex = 0; | |
87 | if(nolines>=2){ | |
88 | Int_t rc=Prepare3DVertex(0); | |
89 | if(rc==0) fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0); | |
90 | /* uncomment to debug | |
91 | printf("Vertex found in first iteration:\n"); | |
92 | fVert3D.Print(); | |
93 | printf("Start second iteration\n"); | |
94 | end of debug lines */ | |
95 | if(fVert3D.GetNContributors()>0){ | |
96 | fLines.Clear("C"); | |
97 | nolines = FindTracklets(itsClusterTree,1); | |
98 | if(nolines>=2){ | |
99 | rc=Prepare3DVertex(1); | |
100 | if(rc==0) fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0); | |
101 | } | |
102 | } | |
103 | /* uncomment to debug | |
104 | printf("Vertex found in second iteration:\n"); | |
105 | fVert3D.Print(); | |
106 | end of debug lines */ | |
107 | ||
108 | Float_t vRadius=TMath::Sqrt(fVert3D.GetXv()*fVert3D.GetXv()+fVert3D.GetYv()*fVert3D.GetYv()); | |
109 | if(vRadius<GetPipeRadius() && fVert3D.GetNContributors()>0){ | |
110 | Double_t position[3]={fVert3D.GetXv(),fVert3D.GetYv(),fVert3D.GetZv()}; | |
111 | Double_t covmatrix[6]; | |
112 | fVert3D.GetCovMatrix(covmatrix); | |
113 | Double_t chi2=99999.; | |
114 | Int_t nContr=fVert3D.GetNContributors(); | |
115 | fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr); | |
116 | fCurrentVertex->SetTitle("vertexer: 3D"); | |
117 | fCurrentVertex->SetName("SPDVertex3D"); | |
118 | fCurrentVertex->SetDispersion(fVert3D.GetDispersion()); | |
119 | } | |
120 | } | |
121 | if(!fCurrentVertex){ | |
122 | AliITSVertexerZ vertz(GetNominalPos()[0],GetNominalPos()[1]); | |
123 | AliDebug(1,"Call Vertexer Z\n"); | |
124 | vertz.SetLowLimit(-fZCutDiamond); | |
125 | vertz.SetHighLimit(fZCutDiamond); | |
126 | AliESDVertex* vtxz = vertz.FindVertexForCurrentEvent(itsClusterTree); | |
127 | if(vtxz){ | |
128 | Double_t position[3]={GetNominalPos()[0],GetNominalPos()[1],vtxz->GetZv()}; | |
129 | Double_t covmatrix[6]; | |
130 | vtxz->GetCovMatrix(covmatrix); | |
131 | Double_t chi2=99999.; | |
132 | Int_t nContr=vtxz->GetNContributors(); | |
133 | fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr); | |
134 | fCurrentVertex->SetTitle("vertexer: Z"); | |
135 | fCurrentVertex->SetName("SPDVertexZ"); | |
136 | delete vtxz; | |
137 | // printf("Vertexer Z success\n"); | |
138 | } | |
139 | ||
140 | } | |
141 | FindMultiplicity(itsClusterTree); | |
142 | return fCurrentVertex; | |
143 | } | |
144 | ||
145 | //______________________________________________________________________ | |
146 | Int_t AliITSVertexer3D::FindTracklets(TTree *itsClusterTree, Int_t optCuts){ | |
147 | // All the possible combinations between recpoints on layer 1and 2 are | |
148 | // considered. Straight lines (=tracklets)are formed. | |
149 | // The tracklets are processed in Prepare3DVertex | |
150 | AliITSDetTypeRec detTypeRec; | |
151 | ||
152 | TTree *tR = itsClusterTree; | |
153 | detTypeRec.SetTreeAddressR(tR); | |
154 | TClonesArray *itsRec = 0; | |
155 | // lc1 and gc1 are local and global coordinates for layer 1 | |
156 | // Float_t lc1[3]={0.,0.,0.}; | |
157 | Float_t gc1[3]={0.,0.,0.}; | |
158 | // lc2 and gc2 are local and global coordinates for layer 2 | |
159 | // Float_t lc2[3]={0.,0.,0.}; | |
160 | Float_t gc2[3]={0.,0.,0.}; | |
161 | ||
162 | itsRec = detTypeRec.RecPoints(); | |
163 | TBranch *branch; | |
164 | branch = tR->GetBranch("ITSRecPoints"); | |
165 | ||
166 | // Set values for cuts | |
167 | Float_t xbeam=GetNominalPos()[0]; | |
168 | Float_t ybeam=GetNominalPos()[1]; | |
169 | Float_t zvert=0.; | |
170 | Float_t deltaPhi=fCoarseDiffPhiCut; | |
171 | Float_t deltaR=fCoarseMaxRCut; | |
172 | Float_t dZmax=fZCutDiamond; | |
173 | if(optCuts){ | |
174 | xbeam=fVert3D.GetXv(); | |
175 | ybeam=fVert3D.GetYv(); | |
176 | zvert=fVert3D.GetZv(); | |
177 | deltaPhi = fDiffPhiMax; | |
178 | deltaR=fMaxRCut; | |
179 | dZmax=fMaxZCut; | |
180 | } | |
181 | Int_t nrpL1 = 0; // number of rec points on layer 1 | |
182 | Int_t nrpL2 = 0; // number of rec points on layer 2 | |
183 | ||
184 | // By default irstL1=0 and lastL1=79 | |
185 | Int_t firstL1 = AliITSgeomTGeo::GetModuleIndex(1,1,1); | |
186 | Int_t lastL1 = AliITSgeomTGeo::GetModuleIndex(2,1,1)-1; | |
187 | for(Int_t module= firstL1; module<=lastL1;module++){ // count number of recopints on layer 1 | |
188 | branch->GetEvent(module); | |
189 | nrpL1+= itsRec->GetEntries(); | |
190 | detTypeRec.ResetRecPoints(); | |
191 | } | |
192 | //By default firstL2=80 and lastL2=239 | |
193 | Int_t firstL2 = AliITSgeomTGeo::GetModuleIndex(2,1,1); | |
194 | Int_t lastL2 = AliITSgeomTGeo::GetModuleIndex(3,1,1)-1; | |
195 | for(Int_t module= firstL2; module<=lastL2;module++){ // count number of recopints on layer 2 | |
196 | branch->GetEvent(module); | |
197 | nrpL2+= itsRec->GetEntries(); | |
198 | detTypeRec.ResetRecPoints(); | |
199 | } | |
200 | if(nrpL1 == 0 || nrpL2 == 0){ | |
201 | return -1; | |
202 | } | |
203 | AliDebug(1,Form("RecPoints on Layer 1,2 = %d, %d\n",nrpL1,nrpL2)); | |
204 | ||
205 | Double_t a[3]={xbeam,ybeam,0.}; | |
206 | Double_t b[3]={xbeam,ybeam,10.}; | |
207 | AliStrLine zeta(a,b,kTRUE); | |
208 | Float_t bField=AliTracker::GetBz()/10.; //T | |
209 | SetMeanPPtSelTracks(bField); | |
210 | ||
211 | Int_t nolines = 0; | |
212 | // Loop on modules of layer 1 | |
213 | for(Int_t modul1= firstL1; modul1<=lastL1;modul1++){ // Loop on modules of layer 1 | |
214 | if(!fUseModule[modul1]) continue; | |
215 | UShort_t ladder=int(modul1/4)+1; // ladders are numbered starting from 1 | |
216 | branch->GetEvent(modul1); | |
217 | Int_t nrecp1 = itsRec->GetEntries(); | |
218 | static TClonesArray prpl1("AliITSRecPoint",nrecp1); | |
219 | prpl1.SetOwner(); | |
220 | for(Int_t j=0;j<nrecp1;j++){ | |
221 | AliITSRecPoint *recp = (AliITSRecPoint*)itsRec->At(j); | |
222 | new(prpl1[j])AliITSRecPoint(*recp); | |
223 | } | |
224 | detTypeRec.ResetRecPoints(); | |
225 | for(Int_t j=0;j<nrecp1;j++){ | |
226 | AliITSRecPoint *recp1 = (AliITSRecPoint*)prpl1.At(j); | |
227 | // Local coordinates of this recpoint | |
228 | /* | |
229 | lc[0]=recp1->GetDetLocalX(); | |
230 | lc[2]=recp1->GetDetLocalZ(); | |
231 | */ | |
232 | recp1->GetGlobalXYZ(gc1); | |
233 | Double_t phi1 = TMath::ATan2(gc1[1]-ybeam,gc1[0]-xbeam); | |
234 | if(phi1<0)phi1=2*TMath::Pi()+phi1; | |
235 | for(Int_t ladl2=0 ; ladl2<fLadOnLay2*2+1;ladl2++){ | |
236 | for(Int_t k=0;k<4;k++){ | |
237 | Int_t ladmod=fLadders[ladder-1]+ladl2; | |
238 | if(ladmod>AliITSgeomTGeo::GetNLadders(2)) ladmod=ladmod-AliITSgeomTGeo::GetNLadders(2); | |
239 | Int_t modul2=AliITSgeomTGeo::GetModuleIndex(2,ladmod,k+1); | |
240 | if(!fUseModule[modul2]) continue; | |
241 | branch->GetEvent(modul2); | |
242 | Int_t nrecp2 = itsRec->GetEntries(); | |
243 | for(Int_t j2=0;j2<nrecp2;j2++){ | |
244 | AliITSRecPoint *recp2 = (AliITSRecPoint*)itsRec->At(j2); | |
245 | /* | |
246 | lc2[0]=recp2->GetDetLocalX(); | |
247 | lc2[2]=recp2->GetDetLocalZ(); | |
248 | */ | |
249 | recp2->GetGlobalXYZ(gc2); | |
250 | Double_t phi2 = TMath::ATan2(gc2[1]-ybeam,gc2[0]-xbeam); | |
251 | if(phi2<0)phi2=2*TMath::Pi()+phi2; | |
252 | Double_t diff = TMath::Abs(phi2-phi1); | |
253 | if(diff>TMath::Pi())diff=2.*TMath::Pi()-diff; | |
254 | if(diff>deltaPhi)continue; | |
255 | AliStrLine line(gc1,gc2,kTRUE); | |
256 | Double_t cp[3]; | |
257 | Int_t retcode = line.Cross(&zeta,cp); | |
258 | if(retcode<0)continue; | |
259 | Double_t dca = line.GetDCA(&zeta); | |
260 | if(dca<0.) continue; | |
261 | if(dca>deltaR)continue; | |
262 | Double_t deltaZ=cp[2]-zvert; | |
263 | if(TMath::Abs(deltaZ)>dZmax)continue; | |
264 | ||
265 | if(nolines == 0){ | |
266 | if(fLines.GetEntriesFast()>0)fLines.Clear("C"); | |
267 | } | |
268 | Float_t cov[6]; | |
269 | recp2->GetGlobalCov(cov); | |
270 | ||
271 | ||
272 | Float_t rad1=TMath::Sqrt(gc1[0]*gc1[0]+gc1[1]*gc1[1]); | |
273 | Float_t rad2=TMath::Sqrt(gc2[0]*gc2[0]+gc2[1]*gc2[1]); | |
274 | Float_t factor=(rad1+rad2)/(rad2-rad1); //factor to account for error on tracklet direction | |
275 | ||
276 | Float_t curvErr=0; | |
277 | if(bField>0.00001){ | |
278 | Float_t curvRadius=fMeanPtSelTrk/(0.3*bField)*100; //cm | |
279 | Float_t dRad=TMath::Sqrt(TMath::Power((gc1[0]-gc2[0]),2)+TMath::Power((gc1[1]-gc2[1]),2)); | |
280 | Float_t aux=dRad/2.+rad1; | |
281 | curvErr=TMath::Sqrt(curvRadius*curvRadius-dRad*dRad/4.)-TMath::Sqrt(curvRadius*curvRadius-aux*aux); //cm | |
282 | } | |
283 | ||
284 | Float_t sigmasq[3]; | |
285 | sigmasq[0]=(cov[0]+curvErr*curvErr/2.)*factor*factor; | |
286 | sigmasq[1]=(cov[3]+curvErr*curvErr/2.)*factor*factor; | |
287 | sigmasq[2]=cov[5]*factor*factor; | |
288 | ||
289 | // Multiple scattering | |
290 | Float_t beta=1.; | |
291 | Float_t beta2=beta*beta; | |
292 | Float_t p2=fMeanPSelTrk*fMeanPSelTrk; | |
293 | Float_t rBP=GetPipeRadius(); | |
294 | Float_t dBP=0.08/35.3; // 800 um of Be | |
295 | Float_t dL1=0.01; //approx. 1% of radiation length | |
296 | Float_t theta2BP=14.1*14.1/(beta2*p2*1e6)*TMath::Abs(dBP); | |
297 | Float_t theta2L1=14.1*14.1/(beta2*p2*1e6)*TMath::Abs(dL1); | |
298 | Float_t thetaBP=TMath::Sqrt(theta2BP); | |
299 | Float_t thetaL1=TMath::Sqrt(theta2L1); | |
300 | // Float_t geomfac[3]; | |
301 | // geomfac[0]=sin(phi1)*sin(phi1); | |
302 | // geomfac[1]=cos(phi1)*cos(phi1); | |
303 | // Float_t tgth=(gc2[2]-gc1[2])/(rad2-rad1); | |
304 | // geomfac[2]=1+tgth*tgth; | |
305 | for(Int_t ico=0; ico<3;ico++){ | |
306 | // printf("Error on coord. %d due to cov matrix+curvErr=%f\n",ico,sigmasq[ico]); | |
307 | // // sigmasq[ico]+=rad1*rad1*geomfac[ico]*theta2L1/2; // multiple scattering in layer 1 | |
308 | // // sigmasq[ico]+=rBP*rBP*geomfac[ico]*theta2BP/2; // multiple scattering in beam pipe | |
309 | sigmasq[ico]+=TMath::Power(rad1*TMath::Tan(thetaL1),2)/3.; | |
310 | sigmasq[ico]+=TMath::Power(rBP*TMath::Tan(thetaBP),2)/3.; | |
311 | ||
312 | // printf("Multipl. scatt. contr %d = %f (LAY1), %f (BP)\n",ico,rad1*rad1*geomfac[ico]*theta2L1/2,rBP*rBP*geomfac[ico]*theta2BP/2); | |
313 | // printf("Total error on coord %d = %f\n",ico,sigmasq[ico]); | |
314 | } | |
315 | Float_t wmat[9]={1.,0.,0.,0.,1.,0.,0.,0.,1.}; | |
316 | if(sigmasq[0]!=0.) wmat[0]=1./sigmasq[0]; | |
317 | if(sigmasq[1]!=0.) wmat[4]=1./sigmasq[1]; | |
318 | if(sigmasq[2]!=0.) wmat[8]=1./sigmasq[2]; | |
319 | new(fLines[nolines++])AliStrLine(gc1,sigmasq,wmat,gc2,kTRUE); | |
320 | ||
321 | } | |
322 | detTypeRec.ResetRecPoints(); | |
323 | } | |
324 | } | |
325 | } | |
326 | prpl1.Clear(); | |
327 | } | |
328 | if(nolines == 0)return -2; | |
329 | return nolines; | |
330 | } | |
331 | ||
332 | //______________________________________________________________________ | |
333 | Int_t AliITSVertexer3D::Prepare3DVertex(Int_t optCuts){ | |
334 | // Finds the 3D vertex information using tracklets | |
335 | Int_t retcode = -1; | |
336 | ||
337 | Float_t xbeam=GetNominalPos()[0]; | |
338 | Float_t ybeam=GetNominalPos()[1]; | |
339 | Float_t zvert=0.; | |
340 | Float_t deltaR=fCoarseMaxRCut; | |
341 | Float_t dZmax=fZCutDiamond; | |
342 | if(optCuts){ | |
343 | xbeam=fVert3D.GetXv(); | |
344 | ybeam=fVert3D.GetYv(); | |
345 | zvert=fVert3D.GetZv(); | |
346 | deltaR=fMaxRCut; | |
347 | dZmax=fMaxZCut; | |
348 | } | |
349 | ||
350 | Int_t nbr=50; | |
351 | Float_t rl=-fCoarseMaxRCut; | |
352 | Float_t rh=fCoarseMaxRCut; | |
353 | Int_t nbz=100; | |
354 | Float_t zl=-fZCutDiamond; | |
355 | Float_t zh=fZCutDiamond; | |
356 | Float_t binsizer=(rh-rl)/nbr; | |
357 | Float_t binsizez=(zh-zl)/nbz; | |
358 | TH3F *h3d = new TH3F("h3d","xyz distribution",nbr,rl,rh,nbr,rl,rh,nbz,zl,zh); | |
359 | Int_t nbrcs=25; | |
360 | Int_t nbzcs=50; | |
361 | TH3F *h3dcs = new TH3F("h3dcs","xyz distribution",nbrcs,rl,rh,nbrcs,rl,rh,nbzcs,zl,zh); | |
362 | ||
363 | // cleanup of the TCLonesArray of tracklets (i.e. fakes are removed) | |
364 | Int_t *validate = new Int_t [fLines.GetEntriesFast()]; | |
365 | for(Int_t i=0; i<fLines.GetEntriesFast();i++)validate[i]=0; | |
366 | for(Int_t i=0; i<fLines.GetEntriesFast()-1;i++){ | |
367 | AliStrLine *l1 = (AliStrLine*)fLines.At(i); | |
368 | for(Int_t j=i+1;j<fLines.GetEntriesFast();j++){ | |
369 | AliStrLine *l2 = (AliStrLine*)fLines.At(j); | |
370 | Float_t dca=l1->GetDCA(l2); | |
371 | if(dca > fDCAcut || dca<0.00001) continue; | |
372 | Double_t point[3]; | |
373 | Int_t retc = l1->Cross(l2,point); | |
374 | if(retc<0)continue; | |
375 | Double_t deltaZ=point[2]-zvert; | |
376 | if(TMath::Abs(deltaZ)>dZmax)continue; | |
377 | Double_t rad=TMath::Sqrt(point[0]*point[0]+point[1]*point[1]); | |
378 | if(rad>fCoarseMaxRCut)continue; | |
379 | Double_t deltaX=point[0]-xbeam; | |
380 | Double_t deltaY=point[1]-ybeam; | |
381 | Double_t raddist=TMath::Sqrt(deltaX*deltaX+deltaY*deltaY); | |
382 | if(raddist>deltaR)continue; | |
383 | validate[i]=1; | |
384 | validate[j]=1; | |
385 | h3d->Fill(point[0],point[1],point[2]); | |
386 | h3dcs->Fill(point[0],point[1],point[2]); | |
387 | } | |
388 | } | |
389 | ||
390 | ||
391 | ||
392 | Int_t numbtracklets=0; | |
393 | for(Int_t i=0; i<fLines.GetEntriesFast();i++)if(validate[i]>=1)numbtracklets++; | |
394 | if(numbtracklets<2){delete [] validate; delete h3d; delete h3dcs; return retcode; } | |
395 | ||
396 | for(Int_t i=0; i<fLines.GetEntriesFast();i++){ | |
397 | if(validate[i]<1)fLines.RemoveAt(i); | |
398 | } | |
399 | fLines.Compress(); | |
400 | AliDebug(1,Form("Number of tracklets (after compress)%d ",fLines.GetEntriesFast())); | |
401 | delete [] validate; | |
402 | ||
403 | // Find peaks in histos | |
404 | ||
405 | Double_t peak[3]={0.,0.,0.}; | |
406 | Int_t ntrkl,ntimes; | |
407 | FindPeaks(h3d,peak,ntrkl,ntimes); | |
408 | delete h3d; | |
409 | ||
410 | if(optCuts==0 && ntrkl<=2){ | |
411 | ntrkl=0; | |
412 | ntimes=0; | |
413 | FindPeaks(h3dcs,peak,ntrkl,ntimes); | |
414 | binsizer=(rh-rl)/nbrcs; | |
415 | binsizez=(zh-zl)/nbzcs; | |
416 | if(ntrkl==1 || ntimes>1){delete h3dcs; return retcode;} | |
417 | } | |
418 | delete h3dcs; | |
419 | ||
420 | // Second selection loop | |
421 | ||
422 | Float_t bs=(binsizer+binsizez)/2.; | |
423 | for(Int_t i=0; i<fLines.GetEntriesFast();i++){ | |
424 | AliStrLine *l1 = (AliStrLine*)fLines.At(i); | |
425 | if(l1->GetDistFromPoint(peak)>2.5*bs)fLines.RemoveAt(i); | |
426 | } | |
427 | fLines.Compress(); | |
428 | AliDebug(1,Form("Number of tracklets (after 2nd compression) %d",fLines.GetEntriesFast())); | |
429 | ||
430 | if(fLines.GetEntriesFast()>1){ | |
431 | // find a first candidate for the primary vertex | |
432 | fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0); | |
433 | // make a further selection on tracklets based on this first candidate | |
434 | fVert3D.GetXYZ(peak); | |
435 | AliDebug(1,Form("FIRST V candidate: %f ; %f ; %f",peak[0],peak[1],peak[2])); | |
436 | for(Int_t i=0; i<fLines.GetEntriesFast();i++){ | |
437 | AliStrLine *l1 = (AliStrLine*)fLines.At(i); | |
438 | if(l1->GetDistFromPoint(peak)> fDCAcut)fLines.RemoveAt(i); | |
439 | } | |
440 | fLines.Compress(); | |
441 | AliDebug(1,Form("Number of tracklets (after 3rd compression) %d",fLines.GetEntriesFast())); | |
442 | if(fLines.GetEntriesFast()>1) retcode=0; // this new tracklet selection is used | |
443 | else retcode =1; // the previous tracklet selection will be used | |
444 | } | |
445 | else { | |
446 | retcode = 0; | |
447 | } | |
448 | return retcode; | |
449 | } | |
450 | ||
451 | //________________________________________________________ | |
452 | void AliITSVertexer3D::SetMeanPPtSelTracks(Float_t fieldTesla){ | |
453 | // Sets mean values of P and Pt based on the field | |
454 | if(TMath::Abs(fieldTesla-0.5)<0.01){ | |
455 | SetMeanPSelTracks(0.885); | |
456 | SetMeanPtSelTracks(0.630); | |
457 | }else if(TMath::Abs(fieldTesla-0.4)<0.01){ | |
458 | SetMeanPSelTracks(0.805); | |
459 | SetMeanPtSelTracks(0.580); | |
460 | }else if(TMath::Abs(fieldTesla-0.2)<0.01){ | |
461 | SetMeanPSelTracks(0.740); | |
462 | SetMeanPtSelTracks(0.530); | |
463 | }else if(fieldTesla<0.00001){ | |
464 | SetMeanPSelTracks(0.730); | |
465 | SetMeanPtSelTracks(0.510); | |
466 | }else{ | |
467 | SetMeanPSelTracks(); | |
468 | SetMeanPtSelTracks(); | |
469 | } | |
470 | } | |
471 | ||
472 | //________________________________________________________ | |
473 | void AliITSVertexer3D::FindPeaks(TH3F* histo, Double_t *peak, Int_t &nOfTracklets, Int_t &nOfTimes){ | |
474 | // Finds bin with max contents in 3D histo of tracket intersections | |
475 | TAxis *xax = histo->GetXaxis(); | |
476 | TAxis *yax = histo->GetYaxis(); | |
477 | TAxis *zax = histo->GetZaxis(); | |
478 | peak[0]=0.; | |
479 | peak[1]=0.; | |
480 | peak[2]=0.; | |
481 | nOfTracklets = 0; | |
482 | nOfTimes=0; | |
483 | for(Int_t i=xax->GetFirst();i<=xax->GetLast();i++){ | |
484 | Float_t xval = xax->GetBinCenter(i); | |
485 | for(Int_t j=yax->GetFirst();j<=yax->GetLast();j++){ | |
486 | Float_t yval = yax->GetBinCenter(j); | |
487 | for(Int_t k=zax->GetFirst();k<=zax->GetLast();k++){ | |
488 | Float_t zval = zax->GetBinCenter(k); | |
489 | Int_t bc =(Int_t)histo->GetBinContent(i,j,k); | |
490 | if(bc>nOfTracklets){ | |
491 | nOfTracklets = bc; | |
492 | peak[2] = zval; | |
493 | peak[1] = yval; | |
494 | peak[0] = xval; | |
495 | nOfTimes = 1; | |
496 | } | |
497 | if(bc==nOfTracklets){ | |
498 | nOfTimes++; | |
499 | } | |
500 | } | |
501 | } | |
502 | } | |
503 | ||
504 | } | |
505 | ||
506 | //________________________________________________________ | |
507 | void AliITSVertexer3D::PrintStatus() const { | |
508 | // Print current status | |
509 | printf("=======================================================\n"); | |
510 | printf("Loose cut on Delta Phi %f\n",fCoarseDiffPhiCut); | |
511 | printf("Cut on tracklet DCA to Z axis %f\n",fCoarseMaxRCut); | |
512 | printf("Cut on tracklet DCA to beam axis %f\n",fMaxRCut); | |
513 | printf("Cut on diamond (Z) %f\n",fZCutDiamond); | |
514 | printf("Cut on DCA - tracklet to tracklet and to vertex %f\n",fDCAcut); | |
515 | printf(" Max Phi difference: %f\n",fDiffPhiMax); | |
516 | printf("=======================================================\n"); | |
517 | } |