]> git.uio.no Git - u/mrichter/AliRoot.git/blame - ITS/AliITSVertexer3D.cxx
git://git.uio.no / u / mrichter / AliRoot.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Changes related to the extraction of the V0 finder into a separate class (A. Dainese...
[u/mrichter/AliRoot.git] / ITS / AliITSVertexer3D.cxx
CommitLineData
70c95f95 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 **************************************************************************/
70c95f95 15#include <TTree.h>
6a0d56b8 16#include "AliESDVertex.h"
cd706e57 17#include "AliLog.h"
6a0d56b8 18#include "AliStrLine.h"
19#include "AliTracker.h"
70c95f95 20#include "AliITSDetTypeRec.h"
21#include "AliITSRecPoint.h"
32e63e47 22#include "AliITSgeomTGeo.h"
6a0d56b8 23#include "AliVertexerTracks.h"
24#include "AliITSVertexer3D.h"
0b7bac55 25#include "AliITSVertexerZ.h"
6b4d9537 26#include "AliITSSortTrkl.h"
70c95f95 27/////////////////////////////////////////////////////////////////
28// this class implements a method to determine
29// the 3 coordinates of the primary vertex
30// for p-p collisions
31// It can be used successfully with Pb-Pb collisions
32////////////////////////////////////////////////////////////////
33
34ClassImp(AliITSVertexer3D)
35
6a0d56b8 36/* $Id$ */
37
70c95f95 38//______________________________________________________________________
7d766abb 39AliITSVertexer3D::AliITSVertexer3D():
40 AliITSVertexer(),
41 fLines("AliStrLine",1000),
42 fVert3D(),
43 fCoarseDiffPhiCut(0.),
44 fFineDiffPhiCut(0.),
45 fCutOnPairs(0.),
46 fCoarseMaxRCut(0.),
47 fMaxRCut(0.),
48 fZCutDiamond(0.),
49 fMaxZCut(0.),
50 fDCAcut(0.),
51 fDiffPhiMax(0.),
52 fMeanPSelTrk(0.),
53 fMeanPtSelTrk(0.),
54 fUsedCluster(kMaxCluPerMod*kNSPDMod),
55 fZHisto(0),
56 fDCAforPileup(0.),
57 fBinSizeR(0.),
58 fBinSizeZ(0.),
59 fPileupAlgo(0)
6a0d56b8 60{
70c95f95 61 // Default constructor
62 SetCoarseDiffPhiCut();
6b4d9537 63 SetFineDiffPhiCut();
64 SetCutOnPairs();
05d1294c 65 SetCoarseMaxRCut();
70c95f95 66 SetMaxRCut();
67 SetZCutDiamond();
05d1294c 68 SetMaxZCut();
7203e11a 69 SetDCACut();
70c95f95 70 SetDiffPhiMax();
6a0d56b8 71 SetMeanPSelTracks();
72 SetMeanPtSelTracks();
cd1c2af1 73 SetMinDCAforPileup();
74 SetPileupAlgo();
7d766abb 75 SetBinSizeR();
76 SetBinSizeZ();
cd1c2af1 77 Float_t binsize=0.02; // default 200 micron
78 Int_t nbins=static_cast<Int_t>(1+2*fZCutDiamond/binsize);
79 fZHisto=new TH1F("hz","",nbins,-fZCutDiamond,-fZCutDiamond+binsize*nbins);
70c95f95 80}
81
70c95f95 82//______________________________________________________________________
83AliITSVertexer3D::~AliITSVertexer3D() {
84 // Destructor
f5f6da22 85 fLines.Clear("C");
cd1c2af1 86 if(fZHisto) delete fZHisto;
70c95f95 87}
88
27167524 89//______________________________________________________________________
90void AliITSVertexer3D::ResetVert3D(){
91 //
6b4d9537 92 ResetVertex();
27167524 93 fVert3D.SetXv(0.);
94 fVert3D.SetYv(0.);
95 fVert3D.SetZv(0.);
96 fVert3D.SetDispersion(0.);
97 fVert3D.SetNContributors(0);
cd1c2af1 98 fUsedCluster.ResetAllBits(0);
27167524 99}
70c95f95 100//______________________________________________________________________
308c2f7c 101AliESDVertex* AliITSVertexer3D::FindVertexForCurrentEvent(TTree *itsClusterTree){
70c95f95 102 // Defines the AliESDVertex for the current event
27167524 103 ResetVert3D();
308c2f7c 104 AliDebug(1,"FindVertexForCurrentEvent - 3D - PROCESSING NEXT EVENT");
6b4d9537 105 fLines.Clear("C");
106 fCurrentVertex = NULL;
70c95f95 107
308c2f7c 108 Int_t nolines = FindTracklets(itsClusterTree,0);
0b7bac55 109 if(nolines>=2){
110 Int_t rc=Prepare3DVertex(0);
6b4d9537 111 if(fPileupAlgo == 2 && rc == 0) FindVertex3DIterative();
112 else if(fPileupAlgo<2 && rc == 0) FindVertex3D(itsClusterTree);
0b7bac55 113 }
6b4d9537 114
0b7bac55 115 if(!fCurrentVertex){
116 AliITSVertexerZ vertz(GetNominalPos()[0],GetNominalPos()[1]);
b96ee725 117 vertz.SetDetTypeRec(GetDetTypeRec());
0b7bac55 118 AliDebug(1,"Call Vertexer Z\n");
cc282e54 119 vertz.SetLowLimit(-fZCutDiamond);
120 vertz.SetHighLimit(fZCutDiamond);
0b7bac55 121 AliESDVertex* vtxz = vertz.FindVertexForCurrentEvent(itsClusterTree);
122 if(vtxz){
123 Double_t position[3]={GetNominalPos()[0],GetNominalPos()[1],vtxz->GetZv()};
124 Double_t covmatrix[6];
125 vtxz->GetCovMatrix(covmatrix);
126 Double_t chi2=99999.;
127 Int_t nContr=vtxz->GetNContributors();
128 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
129 fCurrentVertex->SetTitle("vertexer: Z");
130 fCurrentVertex->SetName("SPDVertexZ");
131 delete vtxz;
0b7bac55 132 }
133
70c95f95 134 }
308c2f7c 135 FindMultiplicity(itsClusterTree);
70c95f95 136 return fCurrentVertex;
137}
138
6b4d9537 139//______________________________________________________________________
140void AliITSVertexer3D::FindVertex3D(TTree *itsClusterTree){
141 // 3D algorithm
6b4d9537 142 /* uncomment to debug
143 printf("Vertex found in first iteration:\n");
144 fVert3D.Print();
145 printf("Start second iteration\n");
146 end of debug lines */
147 if(fVert3D.GetNContributors()>0){
148 fLines.Clear("C");
149 Int_t nolines = FindTracklets(itsClusterTree,1);
150 if(nolines>=2){
151 Int_t rc=Prepare3DVertex(1);
2ecf7a6f 152 if(rc!=0) fVert3D.SetNContributors(0); // exclude this vertex
6b4d9537 153 }
154 }
155 /* uncomment to debug
156 printf("Vertex found in second iteration:\n");
157 fVert3D.Print();
158 end of debug lines */
159
160 Float_t vRadius=TMath::Sqrt(fVert3D.GetXv()*fVert3D.GetXv()+fVert3D.GetYv()*fVert3D.GetYv());
161 if(vRadius<GetPipeRadius() && fVert3D.GetNContributors()>0){
162 Double_t position[3]={fVert3D.GetXv(),fVert3D.GetYv(),fVert3D.GetZv()};
163 Double_t covmatrix[6];
164 fVert3D.GetCovMatrix(covmatrix);
165 Double_t chi2=99999.;
166 Int_t nContr=fVert3D.GetNContributors();
167 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
168 fCurrentVertex->SetTitle("vertexer: 3D");
169 fCurrentVertex->SetName("SPDVertex3D");
170 fCurrentVertex->SetDispersion(fVert3D.GetDispersion());
171 fNoVertices=1;
172
173 switch(fPileupAlgo){
174 case 0: PileupFromZ(); break;
175 case 1: FindOther3DVertices(itsClusterTree); break;
176 default: AliError("Wrong pileup algorithm"); break;
177 }
178 if(fNoVertices==1){
179 fVertArray = new AliESDVertex[1];
180 fVertArray[0]=(*fCurrentVertex);
181 }
182 }
183}
184
185//______________________________________________________________________
186void AliITSVertexer3D::FindVertex3DIterative(){
187 // Defines the AliESDVertex for the current event
188 Int_t numsor=fLines.GetEntriesFast()*(fLines.GetEntriesFast()-1)/2;
189 //cout<<"AliITSVertexer3D::FindVertexForCurentEvent: Number of tracklets selected for vertexing "<<fLines.GetEntriesFast()<<"; Number of pairs: "<<numsor<<endl;
190 AliITSSortTrkl srt(fLines,numsor,fCutOnPairs,fCoarseMaxRCut);
191 srt.FindClusters();
192 AliInfo(Form("Number of vertices: %d",srt.GetNumberOfClusters()));
193
194 fNoVertices = srt.GetNumberOfClusters();
195 //printf("fNoVertices = %d \n",fNoVertices);
196 if(fNoVertices>0){
197 fVertArray = new AliESDVertex[fNoVertices];
198 for(Int_t kk=0; kk<srt.GetNumberOfClusters(); kk++){
199 Int_t size = 0;
200 Int_t *labels = srt.GetTrackletsLab(kk,size);
201 /*
202 Int_t *pairs = srt.GetClusters(kk);
203 Int_t nopai = srt.GetSizeOfCluster(kk);
204 cout<<"***** Vertex number "<<kk<<". Pairs: \n";
205 for(Int_t jj=0;jj<nopai;jj++){
206 cout<<pairs[jj]<<" - ";
207 if(jj>0 & jj%8==0)cout<<endl;
208 }
209 cout<<endl;
210 cout<<"***** Vertex number "<<kk<<". Labels: \n";
211 */
212 AliStrLine **tclo = new AliStrLine* [size];
213 for(Int_t jj=0;jj<size;jj++){
214 // cout<<labels[jj]<<" - ";
215 // if(jj>0 & jj%8==0)cout<<endl;
216 tclo[jj] = dynamic_cast<AliStrLine*>(fLines[labels[jj]]);
217 }
218 // cout<<endl;
219 delete []labels;
220 fVertArray[kk]=AliVertexerTracks::TrackletVertexFinder(tclo,size);
221 delete [] tclo;
222 // fVertArray[kk].PrintStatus();
223 if(kk == 1){
224 // at least one second vertex is present
225 fIsPileup = kTRUE;
226 fNTrpuv = fVertArray[kk].GetNContributors();
227 fZpuv = fVertArray[kk].GetZv();
228 }
229 }
230 Float_t vRadius=TMath::Sqrt(fVertArray[0].GetXv()*fVertArray[0].GetXv()+fVertArray[0].GetYv()*fVertArray[0].GetYv());
231 if(vRadius<GetPipeRadius() && fVertArray[0].GetNContributors()>0){
232 Double_t position[3]={fVertArray[0].GetXv(),fVertArray[0].GetYv(),fVertArray[0].GetZv()};
233 Double_t covmatrix[6];
234 fVertArray[0].GetCovMatrix(covmatrix);
235 Double_t chi2=99999.;
236 Int_t nContr=fVertArray[0].GetNContributors();
237 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
238 fCurrentVertex->SetTitle("vertexer: 3D");
239 fCurrentVertex->SetName("SPDVertex3D");
240 fCurrentVertex->SetDispersion(fVertArray[0].GetDispersion());
241 }
242 }
243
244}
245
246//______________________________________________________________________
247Bool_t AliITSVertexer3D::DistBetweenVertices(AliESDVertex &a, AliESDVertex &b, Double_t test, Double_t &dist){
248 // method to compare the distance between vertices a and b with "test"
249 //it returns kTRUE is the distance is less or equal to test
250 dist = (a.GetX()-b.GetX()) * (a.GetX()-b.GetX());
251 dist += (a.GetY()-b.GetY()) * (a.GetY()-b.GetY());
252 dist += (a.GetZ()-b.GetZ()) * (a.GetZ()-b.GetZ());
253 dist = TMath::Sqrt(dist);
254 if(dist <= test)return kTRUE;
255 return kFALSE;
256}
257
258
70c95f95 259//______________________________________________________________________
308c2f7c 260Int_t AliITSVertexer3D::FindTracklets(TTree *itsClusterTree, Int_t optCuts){
70c95f95 261 // All the possible combinations between recpoints on layer 1and 2 are
262 // considered. Straight lines (=tracklets)are formed.
263 // The tracklets are processed in Prepare3DVertex
70c95f95 264
6b4d9537 265 if(!GetDetTypeRec())AliFatal("DetTypeRec pointer has not been set");
266
308c2f7c 267 TTree *tR = itsClusterTree;
6b4d9537 268 fDetTypeRec->ResetRecPoints();
06a7cbee 269 fDetTypeRec->SetTreeAddressR(tR);
70c95f95 270 TClonesArray *itsRec = 0;
cd1c2af1 271 if(optCuts==0) fZHisto->Reset();
6b4d9537 272 // gc1 are local and global coordinates for layer 1
6a0d56b8 273 Float_t gc1[3]={0.,0.,0.};
6b4d9537 274 // gc2 are local and global coordinates for layer 2
6a0d56b8 275 Float_t gc2[3]={0.,0.,0.};
70c95f95 276
06a7cbee 277 itsRec = fDetTypeRec->RecPoints();
6b4d9537 278 TBranch *branch = NULL;
70c95f95 279 branch = tR->GetBranch("ITSRecPoints");
6b4d9537 280 if(!branch){
281 AliError("Null pointer for RecPoints branch");
282 return -1;
283 }
70c95f95 284
285 // Set values for cuts
ecce5370 286 Float_t xbeam=GetNominalPos()[0];
287 Float_t ybeam=GetNominalPos()[1];
05d1294c 288 Float_t zvert=0.;
70c95f95 289 Float_t deltaPhi=fCoarseDiffPhiCut;
05d1294c 290 Float_t deltaR=fCoarseMaxRCut;
291 Float_t dZmax=fZCutDiamond;
6b4d9537 292 if(fPileupAlgo == 2){
293 deltaPhi=fFineDiffPhiCut;
294 deltaR=fMaxRCut;
295 if(optCuts != 0)AliWarning(Form("fPileupAlgo=2 AND optCuts=%d has been selected. It should be 0",optCuts));
296 } else if(optCuts==1){
27167524 297 xbeam=fVert3D.GetXv();
298 ybeam=fVert3D.GetYv();
299 zvert=fVert3D.GetZv();
70c95f95 300 deltaPhi = fDiffPhiMax;
05d1294c 301 deltaR=fMaxRCut;
302 dZmax=fMaxZCut;
6b4d9537 303 } else if(optCuts==2){
cd1c2af1 304 xbeam=fVert3D.GetXv();
305 ybeam=fVert3D.GetYv();
306 deltaPhi = fDiffPhiMax;
307 deltaR=fMaxRCut;
70c95f95 308 }
cd1c2af1 309
70c95f95 310 Int_t nrpL1 = 0; // number of rec points on layer 1
311 Int_t nrpL2 = 0; // number of rec points on layer 2
312
313 // By default irstL1=0 and lastL1=79
6a0d56b8 314 Int_t firstL1 = AliITSgeomTGeo::GetModuleIndex(1,1,1);
32e63e47 315 Int_t lastL1 = AliITSgeomTGeo::GetModuleIndex(2,1,1)-1;
6a0d56b8 316 for(Int_t module= firstL1; module<=lastL1;module++){ // count number of recopints on layer 1
70c95f95 317 branch->GetEvent(module);
318 nrpL1+= itsRec->GetEntries();
06a7cbee 319 fDetTypeRec->ResetRecPoints();
70c95f95 320 }
6a0d56b8 321 //By default firstL2=80 and lastL2=239
322 Int_t firstL2 = AliITSgeomTGeo::GetModuleIndex(2,1,1);
32e63e47 323 Int_t lastL2 = AliITSgeomTGeo::GetModuleIndex(3,1,1)-1;
6a0d56b8 324 for(Int_t module= firstL2; module<=lastL2;module++){ // count number of recopints on layer 2
70c95f95 325 branch->GetEvent(module);
326 nrpL2+= itsRec->GetEntries();
06a7cbee 327 fDetTypeRec->ResetRecPoints();
70c95f95 328 }
329 if(nrpL1 == 0 || nrpL2 == 0){
70c95f95 330 return -1;
331 }
cd706e57 332 AliDebug(1,Form("RecPoints on Layer 1,2 = %d, %d\n",nrpL1,nrpL2));
70c95f95 333
334 Double_t a[3]={xbeam,ybeam,0.};
335 Double_t b[3]={xbeam,ybeam,10.};
336 AliStrLine zeta(a,b,kTRUE);
6a0d56b8 337 Float_t bField=AliTracker::GetBz()/10.; //T
338 SetMeanPPtSelTracks(bField);
70c95f95 339
340 Int_t nolines = 0;
341 // Loop on modules of layer 1
6a0d56b8 342 for(Int_t modul1= firstL1; modul1<=lastL1;modul1++){ // Loop on modules of layer 1
8c42830a 343 if(!fUseModule[modul1]) continue;
27167524 344 UShort_t ladder=int(modul1/4)+1; // ladders are numbered starting from 1
70c95f95 345 branch->GetEvent(modul1);
346 Int_t nrecp1 = itsRec->GetEntries();
f5f6da22 347 static TClonesArray prpl1("AliITSRecPoint",nrecp1);
348 prpl1.SetOwner();
70c95f95 349 for(Int_t j=0;j<nrecp1;j++){
350 AliITSRecPoint *recp = (AliITSRecPoint*)itsRec->At(j);
f5f6da22 351 new(prpl1[j])AliITSRecPoint(*recp);
70c95f95 352 }
06a7cbee 353 fDetTypeRec->ResetRecPoints();
70c95f95 354 for(Int_t j=0;j<nrecp1;j++){
cd1c2af1 355 if(j>kMaxCluPerMod) continue;
356 UShort_t idClu1=modul1*kMaxCluPerMod+j;
357 if(fUsedCluster.TestBitNumber(idClu1)) continue;
f5f6da22 358 AliITSRecPoint *recp1 = (AliITSRecPoint*)prpl1.At(j);
6a0d56b8 359 recp1->GetGlobalXYZ(gc1);
360 Double_t phi1 = TMath::ATan2(gc1[1]-ybeam,gc1[0]-xbeam);
70c95f95 361 if(phi1<0)phi1=2*TMath::Pi()+phi1;
27167524 362 for(Int_t ladl2=0 ; ladl2<fLadOnLay2*2+1;ladl2++){
363 for(Int_t k=0;k<4;k++){
364 Int_t ladmod=fLadders[ladder-1]+ladl2;
32e63e47 365 if(ladmod>AliITSgeomTGeo::GetNLadders(2)) ladmod=ladmod-AliITSgeomTGeo::GetNLadders(2);
366 Int_t modul2=AliITSgeomTGeo::GetModuleIndex(2,ladmod,k+1);
8c42830a 367 if(!fUseModule[modul2]) continue;
27167524 368 branch->GetEvent(modul2);
369 Int_t nrecp2 = itsRec->GetEntries();
370 for(Int_t j2=0;j2<nrecp2;j2++){
cd1c2af1 371 if(j2>kMaxCluPerMod) continue;
372 UShort_t idClu2=modul2*kMaxCluPerMod+j2;
373 if(fUsedCluster.TestBitNumber(idClu2)) continue;
6a0d56b8 374 AliITSRecPoint *recp2 = (AliITSRecPoint*)itsRec->At(j2);
6a0d56b8 375 recp2->GetGlobalXYZ(gc2);
27167524 376 Double_t phi2 = TMath::ATan2(gc2[1]-ybeam,gc2[0]-xbeam);
377 if(phi2<0)phi2=2*TMath::Pi()+phi2;
378 Double_t diff = TMath::Abs(phi2-phi1);
379 if(diff>TMath::Pi())diff=2.*TMath::Pi()-diff;
cd1c2af1 380 if(optCuts==0 && diff<fDiffPhiMax){
381 Float_t r1=TMath::Sqrt(gc1[0]*gc1[0]+gc1[1]*gc1[1]);
382 Float_t zc1=gc1[2];
383 Float_t r2=TMath::Sqrt(gc2[0]*gc2[0]+gc2[1]*gc2[1]);
384 Float_t zc2=gc2[2];
385 Float_t zr0=(r2*zc1-r1*zc2)/(r2-r1); //Z @ null radius
386 fZHisto->Fill(zr0);
387 }
27167524 388 if(diff>deltaPhi)continue;
6a0d56b8 389 AliStrLine line(gc1,gc2,kTRUE);
27167524 390 Double_t cp[3];
391 Int_t retcode = line.Cross(&zeta,cp);
392 if(retcode<0)continue;
393 Double_t dca = line.GetDCA(&zeta);
394 if(dca<0.) continue;
395 if(dca>deltaR)continue;
396 Double_t deltaZ=cp[2]-zvert;
397 if(TMath::Abs(deltaZ)>dZmax)continue;
6a0d56b8 398
6a0d56b8 399 if(nolines == 0){
f5f6da22 400 if(fLines.GetEntriesFast()>0)fLines.Clear("C");
6a0d56b8 401 }
402 Float_t cov[6];
403 recp2->GetGlobalCov(cov);
404
cd1c2af1 405
6a0d56b8 406 Float_t rad1=TMath::Sqrt(gc1[0]*gc1[0]+gc1[1]*gc1[1]);
407 Float_t rad2=TMath::Sqrt(gc2[0]*gc2[0]+gc2[1]*gc2[1]);
408 Float_t factor=(rad1+rad2)/(rad2-rad1); //factor to account for error on tracklet direction
409
410 Float_t curvErr=0;
411 if(bField>0.00001){
412 Float_t curvRadius=fMeanPtSelTrk/(0.3*bField)*100; //cm
413 Float_t dRad=TMath::Sqrt(TMath::Power((gc1[0]-gc2[0]),2)+TMath::Power((gc1[1]-gc2[1]),2));
414 Float_t aux=dRad/2.+rad1;
415 curvErr=TMath::Sqrt(curvRadius*curvRadius-dRad*dRad/4.)-TMath::Sqrt(curvRadius*curvRadius-aux*aux); //cm
416 }
6a0d56b8 417 Float_t sigmasq[3];
418 sigmasq[0]=(cov[0]+curvErr*curvErr/2.)*factor*factor;
419 sigmasq[1]=(cov[3]+curvErr*curvErr/2.)*factor*factor;
420 sigmasq[2]=cov[5]*factor*factor;
421
422 // Multiple scattering
5951029f 423 Float_t pOverMass=fMeanPSelTrk/0.140;
424 Float_t beta2=pOverMass*pOverMass/(1+pOverMass*pOverMass);
6a0d56b8 425 Float_t p2=fMeanPSelTrk*fMeanPSelTrk;
426 Float_t rBP=GetPipeRadius();
427 Float_t dBP=0.08/35.3; // 800 um of Be
428 Float_t dL1=0.01; //approx. 1% of radiation length
5951029f 429 Float_t theta2BP=14.1*14.1/(beta2*p2*1e6)*dBP;
430 Float_t theta2L1=14.1*14.1/(beta2*p2*1e6)*dL1;
431 Float_t rtantheta1=(rad2-rad1)*TMath::Tan(TMath::Sqrt(theta2L1));
432 Float_t rtanthetaBP=(rad1-rBP)*TMath::Tan(TMath::Sqrt(theta2BP));
6a0d56b8 433 for(Int_t ico=0; ico<3;ico++){
5951029f 434 sigmasq[ico]+=rtantheta1*rtantheta1*factor*factor/3.;
435 sigmasq[ico]+=rtanthetaBP*rtanthetaBP*factor*factor/3.;
6a0d56b8 436 }
437 Float_t wmat[9]={1.,0.,0.,0.,1.,0.,0.,0.,1.};
438 if(sigmasq[0]!=0.) wmat[0]=1./sigmasq[0];
439 if(sigmasq[1]!=0.) wmat[4]=1./sigmasq[1];
440 if(sigmasq[2]!=0.) wmat[8]=1./sigmasq[2];
cd1c2af1 441 new(fLines[nolines++])AliStrLine(gc1,sigmasq,wmat,gc2,kTRUE,idClu1,idClu2);
6a0d56b8 442
27167524 443 }
06a7cbee 444 fDetTypeRec->ResetRecPoints();
70c95f95 445 }
70c95f95 446 }
447 }
f5f6da22 448 prpl1.Clear();
70c95f95 449 }
450 if(nolines == 0)return -2;
451 return nolines;
452}
453
70c95f95 454//______________________________________________________________________
05d1294c 455Int_t AliITSVertexer3D::Prepare3DVertex(Int_t optCuts){
70c95f95 456 // Finds the 3D vertex information using tracklets
457 Int_t retcode = -1;
458
ecce5370 459 Float_t xbeam=GetNominalPos()[0];
460 Float_t ybeam=GetNominalPos()[1];
05d1294c 461 Float_t zvert=0.;
462 Float_t deltaR=fCoarseMaxRCut;
6b4d9537 463 if(fPileupAlgo == 2) {
464 deltaR=fMaxRCut;
465 if(optCuts!=0)AliWarning(Form("fPileupAlgo=2 AND optCuts=%d. It should be 0",optCuts));
466 }
05d1294c 467 Float_t dZmax=fZCutDiamond;
cd1c2af1 468 if(optCuts==1){
27167524 469 xbeam=fVert3D.GetXv();
470 ybeam=fVert3D.GetYv();
471 zvert=fVert3D.GetZv();
05d1294c 472 deltaR=fMaxRCut;
473 dZmax=fMaxZCut;
cd1c2af1 474 }else if(optCuts==2){
475 xbeam=fVert3D.GetXv();
476 ybeam=fVert3D.GetYv();
477 deltaR=fMaxRCut;
05d1294c 478 }
479
05d1294c 480 Float_t rl=-fCoarseMaxRCut;
481 Float_t rh=fCoarseMaxRCut;
70c95f95 482 Float_t zl=-fZCutDiamond;
483 Float_t zh=fZCutDiamond;
7d766abb 484 Int_t nbr=(Int_t)((rh-rl)/fBinSizeR+0.0001);
485 Int_t nbz=(Int_t)((zh-zl)/fBinSizeZ+0.0001);
486 Int_t nbrcs=(Int_t)((rh-rl)/(fBinSizeR*2.)+0.0001);
487 Int_t nbzcs=(Int_t)((zh-zl)/(fBinSizeZ*2.)+0.0001);
488
6b4d9537 489 TH3F *h3d = NULL;
490 TH3F *h3dcs = NULL;
491 if(fPileupAlgo !=2){
492 h3d = new TH3F("h3d","xyz distribution",nbr,rl,rh,nbr,rl,rh,nbz,zl,zh);
493 h3dcs = new TH3F("h3dcs","xyz distribution",nbrcs,rl,rh,nbrcs,rl,rh,nbzcs,zl,zh);
494 }
70c95f95 495 // cleanup of the TCLonesArray of tracklets (i.e. fakes are removed)
f5f6da22 496 Int_t *validate = new Int_t [fLines.GetEntriesFast()];
497 for(Int_t i=0; i<fLines.GetEntriesFast();i++)validate[i]=0;
498 for(Int_t i=0; i<fLines.GetEntriesFast()-1;i++){
f5f6da22 499 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
500 for(Int_t j=i+1;j<fLines.GetEntriesFast();j++){
501 AliStrLine *l2 = (AliStrLine*)fLines.At(j);
05d1294c 502 Float_t dca=l1->GetDCA(l2);
503 if(dca > fDCAcut || dca<0.00001) continue;
70c95f95 504 Double_t point[3];
505 Int_t retc = l1->Cross(l2,point);
506 if(retc<0)continue;
6a0d56b8 507 Double_t deltaZ=point[2]-zvert;
508 if(TMath::Abs(deltaZ)>dZmax)continue;
70c95f95 509 Double_t rad=TMath::Sqrt(point[0]*point[0]+point[1]*point[1]);
05d1294c 510 if(rad>fCoarseMaxRCut)continue;
511 Double_t deltaX=point[0]-xbeam;
512 Double_t deltaY=point[1]-ybeam;
05d1294c 513 Double_t raddist=TMath::Sqrt(deltaX*deltaX+deltaY*deltaY);
05d1294c 514 if(raddist>deltaR)continue;
27167524 515 validate[i]=1;
516 validate[j]=1;
6b4d9537 517 if(fPileupAlgo != 2){
518 h3d->Fill(point[0],point[1],point[2]);
519 h3dcs->Fill(point[0],point[1],point[2]);
520 }
70c95f95 521 }
522 }
523
524
525
70c95f95 526 Int_t numbtracklets=0;
f5f6da22 527 for(Int_t i=0; i<fLines.GetEntriesFast();i++)if(validate[i]>=1)numbtracklets++;
6b4d9537 528 if(numbtracklets<2){
529 delete [] validate;
530 if(fPileupAlgo != 2){
531 delete h3d;
532 delete h3dcs;
533 }
534 return retcode;
535 }
70c95f95 536
f5f6da22 537 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
538 if(validate[i]<1)fLines.RemoveAt(i);
70c95f95 539 }
f5f6da22 540 fLines.Compress();
541 AliDebug(1,Form("Number of tracklets (after compress)%d ",fLines.GetEntriesFast()));
70c95f95 542 delete [] validate;
543
6b4d9537 544 // Exit here if Pileup Algorithm 2 has been chosen
545 if(fPileupAlgo == 2)return 0;
546 //
547
548
7340864d 549 // Find peaks in histos
05d1294c 550
70c95f95 551 Double_t peak[3]={0.,0.,0.};
7340864d 552 Int_t ntrkl,ntimes;
553 FindPeaks(h3d,peak,ntrkl,ntimes);
70c95f95 554 delete h3d;
7d766abb 555 Float_t binsizer=(rh-rl)/nbr;
556 Float_t binsizez=(zh-zl)/nbz;
557 if(optCuts==0 && (ntrkl<=2 || ntimes>1)){
7340864d 558 ntrkl=0;
559 ntimes=0;
560 FindPeaks(h3dcs,peak,ntrkl,ntimes);
561 binsizer=(rh-rl)/nbrcs;
562 binsizez=(zh-zl)/nbzcs;
563 if(ntrkl==1 || ntimes>1){delete h3dcs; return retcode;}
564 }
565 delete h3dcs;
566
70c95f95 567 // Second selection loop
7340864d 568
70c95f95 569 Float_t bs=(binsizer+binsizez)/2.;
f5f6da22 570 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
571 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
572 if(l1->GetDistFromPoint(peak)>2.5*bs)fLines.RemoveAt(i);
70c95f95 573 }
f5f6da22 574 fLines.Compress();
575 AliDebug(1,Form("Number of tracklets (after 2nd compression) %d",fLines.GetEntriesFast()));
70c95f95 576
f5f6da22 577 if(fLines.GetEntriesFast()>1){
2ecf7a6f 578 retcode=0;
27167524 579 // find a first candidate for the primary vertex
f5f6da22 580 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
70c95f95 581 // make a further selection on tracklets based on this first candidate
27167524 582 fVert3D.GetXYZ(peak);
583 AliDebug(1,Form("FIRST V candidate: %f ; %f ; %f",peak[0],peak[1],peak[2]));
f5f6da22 584 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
585 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
586 if(l1->GetDistFromPoint(peak)> fDCAcut)fLines.RemoveAt(i);
70c95f95 587 }
f5f6da22 588 fLines.Compress();
589 AliDebug(1,Form("Number of tracklets (after 3rd compression) %d",fLines.GetEntriesFast()));
2ecf7a6f 590 if(fLines.GetEntriesFast()>1){// this new tracklet selection is used
591 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
592 }
70c95f95 593 }
594 return retcode;
595}
596
6a0d56b8 597//________________________________________________________
598void AliITSVertexer3D::SetMeanPPtSelTracks(Float_t fieldTesla){
5951029f 599 // Sets mean values of Pt based on the field
600 // for P (used in multiple scattering) the most probable value is used
6a0d56b8 601 if(TMath::Abs(fieldTesla-0.5)<0.01){
5951029f 602 SetMeanPSelTracks(0.375);
6a0d56b8 603 SetMeanPtSelTracks(0.630);
604 }else if(TMath::Abs(fieldTesla-0.4)<0.01){
5951029f 605 SetMeanPSelTracks(0.375);
6a0d56b8 606 SetMeanPtSelTracks(0.580);
607 }else if(TMath::Abs(fieldTesla-0.2)<0.01){
5951029f 608 SetMeanPSelTracks(0.375);
6a0d56b8 609 SetMeanPtSelTracks(0.530);
610 }else if(fieldTesla<0.00001){
5951029f 611 SetMeanPSelTracks(0.375);
612 SetMeanPtSelTracks(0.230);
6a0d56b8 613 }else{
614 SetMeanPSelTracks();
615 SetMeanPtSelTracks();
70c95f95 616 }
70c95f95 617}
618
7340864d 619//________________________________________________________
620void AliITSVertexer3D::FindPeaks(TH3F* histo, Double_t *peak, Int_t &nOfTracklets, Int_t &nOfTimes){
621 // Finds bin with max contents in 3D histo of tracket intersections
622 TAxis *xax = histo->GetXaxis();
623 TAxis *yax = histo->GetYaxis();
624 TAxis *zax = histo->GetZaxis();
625 peak[0]=0.;
626 peak[1]=0.;
627 peak[2]=0.;
628 nOfTracklets = 0;
629 nOfTimes=0;
7d766abb 630 Int_t peakbin[3]={0,0,0};
631 Int_t peak2bin[3]={-1,-1,-1};
632 Int_t bc2=-1;
7340864d 633 for(Int_t i=xax->GetFirst();i<=xax->GetLast();i++){
634 Float_t xval = xax->GetBinCenter(i);
635 for(Int_t j=yax->GetFirst();j<=yax->GetLast();j++){
636 Float_t yval = yax->GetBinCenter(j);
637 for(Int_t k=zax->GetFirst();k<=zax->GetLast();k++){
638 Float_t zval = zax->GetBinCenter(k);
639 Int_t bc =(Int_t)histo->GetBinContent(i,j,k);
7d766abb 640 if(bc==0) continue;
7340864d 641 if(bc>nOfTracklets){
7d766abb 642 nOfTracklets=bc;
7340864d 643 peak[2] = zval;
644 peak[1] = yval;
645 peak[0] = xval;
7d766abb 646 peakbin[2] = k;
647 peakbin[1] = j;
648 peakbin[0] = i;
649 peak2bin[2] = -1;
650 peak2bin[1] = -1;
651 peak2bin[0] = -1;
652 bc2=-1;
7340864d 653 nOfTimes = 1;
06a7cbee 654 }else if(bc==nOfTracklets){
7d766abb 655 if(TMath::Abs(i-peakbin[0])<=1 && TMath::Abs(j-peakbin[1])<=1 && TMath::Abs(k-peakbin[2])<=1){
656 peak2bin[2] = k;
657 peak2bin[1] = j;
658 peak2bin[0] = i;
659 bc2=bc;
660 nOfTimes = 1;
661 }else{
662 nOfTimes++;
663 }
7340864d 664 }
665 }
666 }
667 }
7d766abb 668 if(peak2bin[0]>=-1 && bc2!=-1){ // two contiguous peak-cells with same contents
669 peak[0]=0.5*(xax->GetBinCenter(peakbin[0])+xax->GetBinCenter(peak2bin[0]));
670 peak[1]=0.5*(yax->GetBinCenter(peakbin[1])+yax->GetBinCenter(peak2bin[1]));
671 peak[2]=0.5*(zax->GetBinCenter(peakbin[2])+zax->GetBinCenter(peak2bin[2]));
672 nOfTracklets+=bc2;
673 nOfTimes=1;
674 }
7340864d 675}
cd1c2af1 676//________________________________________________________
677void AliITSVertexer3D::MarkUsedClusters(){
678 // Mark clusters of tracklets used in vertex claulation
679 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
680 AliStrLine *lin = (AliStrLine*)fLines.At(i);
681 Int_t idClu1=lin->GetIdPoint(0);
682 Int_t idClu2=lin->GetIdPoint(1);
683 fUsedCluster.SetBitNumber(idClu1);
684 fUsedCluster.SetBitNumber(idClu2);
685 }
686}
687//________________________________________________________
688Int_t AliITSVertexer3D::RemoveTracklets(){
689 // Remove trackelts close to first found vertex
690 Double_t vert[3]={fVert3D.GetXv(),fVert3D.GetYv(),fVert3D.GetZv()};
691 Int_t nRemoved=0;
692 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
693 AliStrLine *lin = (AliStrLine*)fLines.At(i);
694 if(lin->GetDistFromPoint(vert)<fDCAforPileup){
695 Int_t idClu1=lin->GetIdPoint(0);
696 Int_t idClu2=lin->GetIdPoint(1);
697 fUsedCluster.SetBitNumber(idClu1);
698 fUsedCluster.SetBitNumber(idClu2);
699 fLines.RemoveAt(i);
700 ++nRemoved;
701 }
702 }
703 fLines.Compress();
704 return nRemoved;
705}
706//________________________________________________________
707void AliITSVertexer3D::FindOther3DVertices(TTree *itsClusterTree){
708 // pileup identification based on 3D vertexing with not used clusters
709 MarkUsedClusters();
710 fLines.Clear("C");
711 Int_t nolines = FindTracklets(itsClusterTree,2);
712 if(nolines>=2){
713 Int_t nr=RemoveTracklets();
714 nolines-=nr;
715 if(nolines>=2){
716 Int_t rc=Prepare3DVertex(2);
717 if(rc==0){
718 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
719 if(fVert3D.GetNContributors()>=fMinTrackletsForPilup){
720 fIsPileup=kTRUE;
6b4d9537 721 fNoVertices=2;
722 fVertArray = new AliESDVertex[2];
723 fVertArray[0]=(*fCurrentVertex);
724 fVertArray[1]=fVert3D;
cd1c2af1 725 fZpuv=fVert3D.GetZv();
726 fNTrpuv=fVert3D.GetNContributors();
727 }
728 }
729 }
730 }
731}
732//______________________________________________________________________
733void AliITSVertexer3D::PileupFromZ(){
734 // Calls the pileup algorithm of ALiITSVertexerZ
735 Int_t binmin, binmax;
736 Int_t nPeaks=AliITSVertexerZ::GetPeakRegion(fZHisto,binmin,binmax);
737 if(nPeaks==2)AliWarning("2 peaks found");
738 Int_t firstPeakCont=0;
739 Float_t firstPeakPos=0.;
740 for(Int_t i=binmin-1;i<=binmax+1;i++){
6b4d9537 741 firstPeakCont+=static_cast<Int_t>(fZHisto->GetBinContent(i));
cd1c2af1 742 firstPeakPos+=fZHisto->GetBinContent(i)*fZHisto->GetBinCenter(i);
743 }
73315c4a 744 if(firstPeakCont>0){
745 firstPeakPos/=firstPeakCont;
746 Int_t ncontr2=0;
747 if(firstPeakCont>fMinTrackletsForPilup){
748 Float_t secPeakPos;
749 ncontr2=AliITSVertexerZ::FindSecondPeak(fZHisto,binmin,binmax,secPeakPos);
750 if(ncontr2>=fMinTrackletsForPilup){
751 fIsPileup=kTRUE;
6b4d9537 752 fNoVertices=2;
753 AliESDVertex secondVert(secPeakPos,0.1,ncontr2);
754 fVertArray = new AliESDVertex[2];
755 fVertArray[0]=(*fCurrentVertex);
756 fVertArray[1]=secondVert;
73315c4a 757 fZpuv=secPeakPos;
758 fNTrpuv=ncontr2;
759 }
cd1c2af1 760 }
761 }
762}
70c95f95 763//________________________________________________________
764void AliITSVertexer3D::PrintStatus() const {
765 // Print current status
6a0d56b8 766 printf("=======================================================\n");
767 printf("Loose cut on Delta Phi %f\n",fCoarseDiffPhiCut);
768 printf("Cut on tracklet DCA to Z axis %f\n",fCoarseMaxRCut);
769 printf("Cut on tracklet DCA to beam axis %f\n",fMaxRCut);
770 printf("Cut on diamond (Z) %f\n",fZCutDiamond);
771 printf("Cut on DCA - tracklet to tracklet and to vertex %f\n",fDCAcut);
cd1c2af1 772 printf("Max Phi difference: %f\n",fDiffPhiMax);
773 printf("Pileup algo: %d\n",fPileupAlgo);
774 printf("Min DCA to 1st vetrtex for pileup: %f\n",fDCAforPileup);
6a0d56b8 775 printf("=======================================================\n");
70c95f95 776}