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Adding pileup algorithm 2
[u/mrichter/AliRoot.git] / ITS / AliITSVertexer3D.cxx
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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//______________________________________________________________________
39AliITSVertexer3D::AliITSVertexer3D():AliITSVertexer(),
308c2f7c 40fLines("AliStrLine",1000),
70c95f95 41fVert3D(),
42fCoarseDiffPhiCut(0.),
6b4d9537 43fFineDiffPhiCut(0.),
44fCutOnPairs(0.),
05d1294c 45fCoarseMaxRCut(0.),
70c95f95 46fMaxRCut(0.),
47fZCutDiamond(0.),
05d1294c 48fMaxZCut(0.),
70c95f95 49fDCAcut(0.),
6a0d56b8 50fDiffPhiMax(0.),
51fMeanPSelTrk(0.),
cd1c2af1 52fMeanPtSelTrk(0.),
53fUsedCluster(kMaxCluPerMod*kNSPDMod),
54fZHisto(0),
55fDCAforPileup(0.),
56fPileupAlgo(0)
6a0d56b8 57{
70c95f95 58 // Default constructor
59 SetCoarseDiffPhiCut();
6b4d9537 60 SetFineDiffPhiCut();
61 SetCutOnPairs();
05d1294c 62 SetCoarseMaxRCut();
70c95f95 63 SetMaxRCut();
64 SetZCutDiamond();
05d1294c 65 SetMaxZCut();
7203e11a 66 SetDCACut();
70c95f95 67 SetDiffPhiMax();
6a0d56b8 68 SetMeanPSelTracks();
69 SetMeanPtSelTracks();
cd1c2af1 70 SetMinDCAforPileup();
71 SetPileupAlgo();
72 Float_t binsize=0.02; // default 200 micron
73 Int_t nbins=static_cast<Int_t>(1+2*fZCutDiamond/binsize);
74 fZHisto=new TH1F("hz","",nbins,-fZCutDiamond,-fZCutDiamond+binsize*nbins);
70c95f95 75}
76
70c95f95 77//______________________________________________________________________
78AliITSVertexer3D::~AliITSVertexer3D() {
79 // Destructor
f5f6da22 80 fLines.Clear("C");
cd1c2af1 81 if(fZHisto) delete fZHisto;
70c95f95 82}
83
27167524 84//______________________________________________________________________
85void AliITSVertexer3D::ResetVert3D(){
86 //
6b4d9537 87 ResetVertex();
27167524 88 fVert3D.SetXv(0.);
89 fVert3D.SetYv(0.);
90 fVert3D.SetZv(0.);
91 fVert3D.SetDispersion(0.);
92 fVert3D.SetNContributors(0);
cd1c2af1 93 fUsedCluster.ResetAllBits(0);
27167524 94}
70c95f95 95//______________________________________________________________________
308c2f7c 96AliESDVertex* AliITSVertexer3D::FindVertexForCurrentEvent(TTree *itsClusterTree){
70c95f95 97 // Defines the AliESDVertex for the current event
27167524 98 ResetVert3D();
308c2f7c 99 AliDebug(1,"FindVertexForCurrentEvent - 3D - PROCESSING NEXT EVENT");
6b4d9537 100 fLines.Clear("C");
101 fCurrentVertex = NULL;
70c95f95 102
308c2f7c 103 Int_t nolines = FindTracklets(itsClusterTree,0);
0b7bac55 104 if(nolines>=2){
105 Int_t rc=Prepare3DVertex(0);
6b4d9537 106 if(fPileupAlgo == 2 && rc == 0) FindVertex3DIterative();
107 else if(fPileupAlgo<2 && rc == 0) FindVertex3D(itsClusterTree);
0b7bac55 108 }
6b4d9537 109
0b7bac55 110 if(!fCurrentVertex){
111 AliITSVertexerZ vertz(GetNominalPos()[0],GetNominalPos()[1]);
b96ee725 112 vertz.SetDetTypeRec(GetDetTypeRec());
0b7bac55 113 AliDebug(1,"Call Vertexer Z\n");
cc282e54 114 vertz.SetLowLimit(-fZCutDiamond);
115 vertz.SetHighLimit(fZCutDiamond);
0b7bac55 116 AliESDVertex* vtxz = vertz.FindVertexForCurrentEvent(itsClusterTree);
117 if(vtxz){
118 Double_t position[3]={GetNominalPos()[0],GetNominalPos()[1],vtxz->GetZv()};
119 Double_t covmatrix[6];
120 vtxz->GetCovMatrix(covmatrix);
121 Double_t chi2=99999.;
122 Int_t nContr=vtxz->GetNContributors();
123 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
124 fCurrentVertex->SetTitle("vertexer: Z");
125 fCurrentVertex->SetName("SPDVertexZ");
126 delete vtxz;
0b7bac55 127 }
128
70c95f95 129 }
308c2f7c 130 FindMultiplicity(itsClusterTree);
70c95f95 131 return fCurrentVertex;
132}
133
6b4d9537 134//______________________________________________________________________
135void AliITSVertexer3D::FindVertex3D(TTree *itsClusterTree){
136 // 3D algorithm
137 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
138 /* uncomment to debug
139 printf("Vertex found in first iteration:\n");
140 fVert3D.Print();
141 printf("Start second iteration\n");
142 end of debug lines */
143 if(fVert3D.GetNContributors()>0){
144 fLines.Clear("C");
145 Int_t nolines = FindTracklets(itsClusterTree,1);
146 if(nolines>=2){
147 Int_t rc=Prepare3DVertex(1);
148 if(rc==0) fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
149 }
150 }
151 /* uncomment to debug
152 printf("Vertex found in second iteration:\n");
153 fVert3D.Print();
154 end of debug lines */
155
156 Float_t vRadius=TMath::Sqrt(fVert3D.GetXv()*fVert3D.GetXv()+fVert3D.GetYv()*fVert3D.GetYv());
157 if(vRadius<GetPipeRadius() && fVert3D.GetNContributors()>0){
158 Double_t position[3]={fVert3D.GetXv(),fVert3D.GetYv(),fVert3D.GetZv()};
159 Double_t covmatrix[6];
160 fVert3D.GetCovMatrix(covmatrix);
161 Double_t chi2=99999.;
162 Int_t nContr=fVert3D.GetNContributors();
163 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
164 fCurrentVertex->SetTitle("vertexer: 3D");
165 fCurrentVertex->SetName("SPDVertex3D");
166 fCurrentVertex->SetDispersion(fVert3D.GetDispersion());
167 fNoVertices=1;
168
169 switch(fPileupAlgo){
170 case 0: PileupFromZ(); break;
171 case 1: FindOther3DVertices(itsClusterTree); break;
172 default: AliError("Wrong pileup algorithm"); break;
173 }
174 if(fNoVertices==1){
175 fVertArray = new AliESDVertex[1];
176 fVertArray[0]=(*fCurrentVertex);
177 }
178 }
179}
180
181//______________________________________________________________________
182void AliITSVertexer3D::FindVertex3DIterative(){
183 // Defines the AliESDVertex for the current event
184 Int_t numsor=fLines.GetEntriesFast()*(fLines.GetEntriesFast()-1)/2;
185 //cout<<"AliITSVertexer3D::FindVertexForCurentEvent: Number of tracklets selected for vertexing "<<fLines.GetEntriesFast()<<"; Number of pairs: "<<numsor<<endl;
186 AliITSSortTrkl srt(fLines,numsor,fCutOnPairs,fCoarseMaxRCut);
187 srt.FindClusters();
188 AliInfo(Form("Number of vertices: %d",srt.GetNumberOfClusters()));
189
190 fNoVertices = srt.GetNumberOfClusters();
191 //printf("fNoVertices = %d \n",fNoVertices);
192 if(fNoVertices>0){
193 fVertArray = new AliESDVertex[fNoVertices];
194 for(Int_t kk=0; kk<srt.GetNumberOfClusters(); kk++){
195 Int_t size = 0;
196 Int_t *labels = srt.GetTrackletsLab(kk,size);
197 /*
198 Int_t *pairs = srt.GetClusters(kk);
199 Int_t nopai = srt.GetSizeOfCluster(kk);
200 cout<<"***** Vertex number "<<kk<<". Pairs: \n";
201 for(Int_t jj=0;jj<nopai;jj++){
202 cout<<pairs[jj]<<" - ";
203 if(jj>0 & jj%8==0)cout<<endl;
204 }
205 cout<<endl;
206 cout<<"***** Vertex number "<<kk<<". Labels: \n";
207 */
208 AliStrLine **tclo = new AliStrLine* [size];
209 for(Int_t jj=0;jj<size;jj++){
210 // cout<<labels[jj]<<" - ";
211 // if(jj>0 & jj%8==0)cout<<endl;
212 tclo[jj] = dynamic_cast<AliStrLine*>(fLines[labels[jj]]);
213 }
214 // cout<<endl;
215 delete []labels;
216 fVertArray[kk]=AliVertexerTracks::TrackletVertexFinder(tclo,size);
217 delete [] tclo;
218 // fVertArray[kk].PrintStatus();
219 if(kk == 1){
220 // at least one second vertex is present
221 fIsPileup = kTRUE;
222 fNTrpuv = fVertArray[kk].GetNContributors();
223 fZpuv = fVertArray[kk].GetZv();
224 }
225 }
226 Float_t vRadius=TMath::Sqrt(fVertArray[0].GetXv()*fVertArray[0].GetXv()+fVertArray[0].GetYv()*fVertArray[0].GetYv());
227 if(vRadius<GetPipeRadius() && fVertArray[0].GetNContributors()>0){
228 Double_t position[3]={fVertArray[0].GetXv(),fVertArray[0].GetYv(),fVertArray[0].GetZv()};
229 Double_t covmatrix[6];
230 fVertArray[0].GetCovMatrix(covmatrix);
231 Double_t chi2=99999.;
232 Int_t nContr=fVertArray[0].GetNContributors();
233 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
234 fCurrentVertex->SetTitle("vertexer: 3D");
235 fCurrentVertex->SetName("SPDVertex3D");
236 fCurrentVertex->SetDispersion(fVertArray[0].GetDispersion());
237 }
238 }
239
240}
241
242//______________________________________________________________________
243Bool_t AliITSVertexer3D::DistBetweenVertices(AliESDVertex &a, AliESDVertex &b, Double_t test, Double_t &dist){
244 // method to compare the distance between vertices a and b with "test"
245 //it returns kTRUE is the distance is less or equal to test
246 dist = (a.GetX()-b.GetX()) * (a.GetX()-b.GetX());
247 dist += (a.GetY()-b.GetY()) * (a.GetY()-b.GetY());
248 dist += (a.GetZ()-b.GetZ()) * (a.GetZ()-b.GetZ());
249 dist = TMath::Sqrt(dist);
250 if(dist <= test)return kTRUE;
251 return kFALSE;
252}
253
254
70c95f95 255//______________________________________________________________________
308c2f7c 256Int_t AliITSVertexer3D::FindTracklets(TTree *itsClusterTree, Int_t optCuts){
70c95f95 257 // All the possible combinations between recpoints on layer 1and 2 are
258 // considered. Straight lines (=tracklets)are formed.
259 // The tracklets are processed in Prepare3DVertex
70c95f95 260
6b4d9537 261 if(!GetDetTypeRec())AliFatal("DetTypeRec pointer has not been set");
262
308c2f7c 263 TTree *tR = itsClusterTree;
6b4d9537 264 fDetTypeRec->ResetRecPoints();
06a7cbee 265 fDetTypeRec->SetTreeAddressR(tR);
70c95f95 266 TClonesArray *itsRec = 0;
cd1c2af1 267 if(optCuts==0) fZHisto->Reset();
6b4d9537 268 // gc1 are local and global coordinates for layer 1
6a0d56b8 269 Float_t gc1[3]={0.,0.,0.};
6b4d9537 270 // gc2 are local and global coordinates for layer 2
6a0d56b8 271 Float_t gc2[3]={0.,0.,0.};
70c95f95 272
06a7cbee 273 itsRec = fDetTypeRec->RecPoints();
6b4d9537 274 TBranch *branch = NULL;
70c95f95 275 branch = tR->GetBranch("ITSRecPoints");
6b4d9537 276 if(!branch){
277 AliError("Null pointer for RecPoints branch");
278 return -1;
279 }
70c95f95 280
281 // Set values for cuts
ecce5370 282 Float_t xbeam=GetNominalPos()[0];
283 Float_t ybeam=GetNominalPos()[1];
05d1294c 284 Float_t zvert=0.;
70c95f95 285 Float_t deltaPhi=fCoarseDiffPhiCut;
05d1294c 286 Float_t deltaR=fCoarseMaxRCut;
287 Float_t dZmax=fZCutDiamond;
6b4d9537 288 if(fPileupAlgo == 2){
289 deltaPhi=fFineDiffPhiCut;
290 deltaR=fMaxRCut;
291 if(optCuts != 0)AliWarning(Form("fPileupAlgo=2 AND optCuts=%d has been selected. It should be 0",optCuts));
292 } else if(optCuts==1){
27167524 293 xbeam=fVert3D.GetXv();
294 ybeam=fVert3D.GetYv();
295 zvert=fVert3D.GetZv();
70c95f95 296 deltaPhi = fDiffPhiMax;
05d1294c 297 deltaR=fMaxRCut;
298 dZmax=fMaxZCut;
6b4d9537 299 } else if(optCuts==2){
cd1c2af1 300 xbeam=fVert3D.GetXv();
301 ybeam=fVert3D.GetYv();
302 deltaPhi = fDiffPhiMax;
303 deltaR=fMaxRCut;
70c95f95 304 }
cd1c2af1 305
70c95f95 306 Int_t nrpL1 = 0; // number of rec points on layer 1
307 Int_t nrpL2 = 0; // number of rec points on layer 2
308
309 // By default irstL1=0 and lastL1=79
6a0d56b8 310 Int_t firstL1 = AliITSgeomTGeo::GetModuleIndex(1,1,1);
32e63e47 311 Int_t lastL1 = AliITSgeomTGeo::GetModuleIndex(2,1,1)-1;
6a0d56b8 312 for(Int_t module= firstL1; module<=lastL1;module++){ // count number of recopints on layer 1
70c95f95 313 branch->GetEvent(module);
314 nrpL1+= itsRec->GetEntries();
06a7cbee 315 fDetTypeRec->ResetRecPoints();
70c95f95 316 }
6a0d56b8 317 //By default firstL2=80 and lastL2=239
318 Int_t firstL2 = AliITSgeomTGeo::GetModuleIndex(2,1,1);
32e63e47 319 Int_t lastL2 = AliITSgeomTGeo::GetModuleIndex(3,1,1)-1;
6a0d56b8 320 for(Int_t module= firstL2; module<=lastL2;module++){ // count number of recopints on layer 2
70c95f95 321 branch->GetEvent(module);
322 nrpL2+= itsRec->GetEntries();
06a7cbee 323 fDetTypeRec->ResetRecPoints();
70c95f95 324 }
325 if(nrpL1 == 0 || nrpL2 == 0){
70c95f95 326 return -1;
327 }
cd706e57 328 AliDebug(1,Form("RecPoints on Layer 1,2 = %d, %d\n",nrpL1,nrpL2));
70c95f95 329
330 Double_t a[3]={xbeam,ybeam,0.};
331 Double_t b[3]={xbeam,ybeam,10.};
332 AliStrLine zeta(a,b,kTRUE);
6a0d56b8 333 Float_t bField=AliTracker::GetBz()/10.; //T
334 SetMeanPPtSelTracks(bField);
70c95f95 335
336 Int_t nolines = 0;
337 // Loop on modules of layer 1
6a0d56b8 338 for(Int_t modul1= firstL1; modul1<=lastL1;modul1++){ // Loop on modules of layer 1
8c42830a 339 if(!fUseModule[modul1]) continue;
27167524 340 UShort_t ladder=int(modul1/4)+1; // ladders are numbered starting from 1
70c95f95 341 branch->GetEvent(modul1);
342 Int_t nrecp1 = itsRec->GetEntries();
f5f6da22 343 static TClonesArray prpl1("AliITSRecPoint",nrecp1);
344 prpl1.SetOwner();
70c95f95 345 for(Int_t j=0;j<nrecp1;j++){
346 AliITSRecPoint *recp = (AliITSRecPoint*)itsRec->At(j);
f5f6da22 347 new(prpl1[j])AliITSRecPoint(*recp);
70c95f95 348 }
06a7cbee 349 fDetTypeRec->ResetRecPoints();
70c95f95 350 for(Int_t j=0;j<nrecp1;j++){
cd1c2af1 351 if(j>kMaxCluPerMod) continue;
352 UShort_t idClu1=modul1*kMaxCluPerMod+j;
353 if(fUsedCluster.TestBitNumber(idClu1)) continue;
f5f6da22 354 AliITSRecPoint *recp1 = (AliITSRecPoint*)prpl1.At(j);
6a0d56b8 355 recp1->GetGlobalXYZ(gc1);
356 Double_t phi1 = TMath::ATan2(gc1[1]-ybeam,gc1[0]-xbeam);
70c95f95 357 if(phi1<0)phi1=2*TMath::Pi()+phi1;
27167524 358 for(Int_t ladl2=0 ; ladl2<fLadOnLay2*2+1;ladl2++){
359 for(Int_t k=0;k<4;k++){
360 Int_t ladmod=fLadders[ladder-1]+ladl2;
32e63e47 361 if(ladmod>AliITSgeomTGeo::GetNLadders(2)) ladmod=ladmod-AliITSgeomTGeo::GetNLadders(2);
362 Int_t modul2=AliITSgeomTGeo::GetModuleIndex(2,ladmod,k+1);
8c42830a 363 if(!fUseModule[modul2]) continue;
27167524 364 branch->GetEvent(modul2);
365 Int_t nrecp2 = itsRec->GetEntries();
366 for(Int_t j2=0;j2<nrecp2;j2++){
cd1c2af1 367 if(j2>kMaxCluPerMod) continue;
368 UShort_t idClu2=modul2*kMaxCluPerMod+j2;
369 if(fUsedCluster.TestBitNumber(idClu2)) continue;
6a0d56b8 370 AliITSRecPoint *recp2 = (AliITSRecPoint*)itsRec->At(j2);
6a0d56b8 371 recp2->GetGlobalXYZ(gc2);
27167524 372 Double_t phi2 = TMath::ATan2(gc2[1]-ybeam,gc2[0]-xbeam);
373 if(phi2<0)phi2=2*TMath::Pi()+phi2;
374 Double_t diff = TMath::Abs(phi2-phi1);
375 if(diff>TMath::Pi())diff=2.*TMath::Pi()-diff;
cd1c2af1 376 if(optCuts==0 && diff<fDiffPhiMax){
377 Float_t r1=TMath::Sqrt(gc1[0]*gc1[0]+gc1[1]*gc1[1]);
378 Float_t zc1=gc1[2];
379 Float_t r2=TMath::Sqrt(gc2[0]*gc2[0]+gc2[1]*gc2[1]);
380 Float_t zc2=gc2[2];
381 Float_t zr0=(r2*zc1-r1*zc2)/(r2-r1); //Z @ null radius
382 fZHisto->Fill(zr0);
383 }
27167524 384 if(diff>deltaPhi)continue;
6a0d56b8 385 AliStrLine line(gc1,gc2,kTRUE);
27167524 386 Double_t cp[3];
387 Int_t retcode = line.Cross(&zeta,cp);
388 if(retcode<0)continue;
389 Double_t dca = line.GetDCA(&zeta);
390 if(dca<0.) continue;
391 if(dca>deltaR)continue;
392 Double_t deltaZ=cp[2]-zvert;
393 if(TMath::Abs(deltaZ)>dZmax)continue;
6a0d56b8 394
6a0d56b8 395 if(nolines == 0){
f5f6da22 396 if(fLines.GetEntriesFast()>0)fLines.Clear("C");
6a0d56b8 397 }
398 Float_t cov[6];
399 recp2->GetGlobalCov(cov);
400
cd1c2af1 401
6a0d56b8 402 Float_t rad1=TMath::Sqrt(gc1[0]*gc1[0]+gc1[1]*gc1[1]);
403 Float_t rad2=TMath::Sqrt(gc2[0]*gc2[0]+gc2[1]*gc2[1]);
404 Float_t factor=(rad1+rad2)/(rad2-rad1); //factor to account for error on tracklet direction
405
406 Float_t curvErr=0;
407 if(bField>0.00001){
408 Float_t curvRadius=fMeanPtSelTrk/(0.3*bField)*100; //cm
409 Float_t dRad=TMath::Sqrt(TMath::Power((gc1[0]-gc2[0]),2)+TMath::Power((gc1[1]-gc2[1]),2));
410 Float_t aux=dRad/2.+rad1;
411 curvErr=TMath::Sqrt(curvRadius*curvRadius-dRad*dRad/4.)-TMath::Sqrt(curvRadius*curvRadius-aux*aux); //cm
412 }
6a0d56b8 413 Float_t sigmasq[3];
414 sigmasq[0]=(cov[0]+curvErr*curvErr/2.)*factor*factor;
415 sigmasq[1]=(cov[3]+curvErr*curvErr/2.)*factor*factor;
416 sigmasq[2]=cov[5]*factor*factor;
417
418 // Multiple scattering
419 Float_t beta=1.;
420 Float_t beta2=beta*beta;
421 Float_t p2=fMeanPSelTrk*fMeanPSelTrk;
422 Float_t rBP=GetPipeRadius();
423 Float_t dBP=0.08/35.3; // 800 um of Be
424 Float_t dL1=0.01; //approx. 1% of radiation length
425 Float_t theta2BP=14.1*14.1/(beta2*p2*1e6)*TMath::Abs(dBP);
426 Float_t theta2L1=14.1*14.1/(beta2*p2*1e6)*TMath::Abs(dL1);
427 Float_t thetaBP=TMath::Sqrt(theta2BP);
428 Float_t thetaL1=TMath::Sqrt(theta2L1);
6a0d56b8 429 for(Int_t ico=0; ico<3;ico++){
430// printf("Error on coord. %d due to cov matrix+curvErr=%f\n",ico,sigmasq[ico]);
431// // sigmasq[ico]+=rad1*rad1*geomfac[ico]*theta2L1/2; // multiple scattering in layer 1
432// // sigmasq[ico]+=rBP*rBP*geomfac[ico]*theta2BP/2; // multiple scattering in beam pipe
433 sigmasq[ico]+=TMath::Power(rad1*TMath::Tan(thetaL1),2)/3.;
434 sigmasq[ico]+=TMath::Power(rBP*TMath::Tan(thetaBP),2)/3.;
435
436// printf("Multipl. scatt. contr %d = %f (LAY1), %f (BP)\n",ico,rad1*rad1*geomfac[ico]*theta2L1/2,rBP*rBP*geomfac[ico]*theta2BP/2);
437// printf("Total error on coord %d = %f\n",ico,sigmasq[ico]);
438 }
439 Float_t wmat[9]={1.,0.,0.,0.,1.,0.,0.,0.,1.};
440 if(sigmasq[0]!=0.) wmat[0]=1./sigmasq[0];
441 if(sigmasq[1]!=0.) wmat[4]=1./sigmasq[1];
442 if(sigmasq[2]!=0.) wmat[8]=1./sigmasq[2];
cd1c2af1 443 new(fLines[nolines++])AliStrLine(gc1,sigmasq,wmat,gc2,kTRUE,idClu1,idClu2);
6a0d56b8 444
27167524 445 }
06a7cbee 446 fDetTypeRec->ResetRecPoints();
70c95f95 447 }
70c95f95 448 }
449 }
f5f6da22 450 prpl1.Clear();
70c95f95 451 }
452 if(nolines == 0)return -2;
453 return nolines;
454}
455
70c95f95 456//______________________________________________________________________
05d1294c 457Int_t AliITSVertexer3D::Prepare3DVertex(Int_t optCuts){
70c95f95 458 // Finds the 3D vertex information using tracklets
459 Int_t retcode = -1;
460
ecce5370 461 Float_t xbeam=GetNominalPos()[0];
462 Float_t ybeam=GetNominalPos()[1];
05d1294c 463 Float_t zvert=0.;
464 Float_t deltaR=fCoarseMaxRCut;
6b4d9537 465 if(fPileupAlgo == 2) {
466 deltaR=fMaxRCut;
467 if(optCuts!=0)AliWarning(Form("fPileupAlgo=2 AND optCuts=%d. It should be 0",optCuts));
468 }
05d1294c 469 Float_t dZmax=fZCutDiamond;
cd1c2af1 470 if(optCuts==1){
27167524 471 xbeam=fVert3D.GetXv();
472 ybeam=fVert3D.GetYv();
473 zvert=fVert3D.GetZv();
05d1294c 474 deltaR=fMaxRCut;
475 dZmax=fMaxZCut;
cd1c2af1 476 }else if(optCuts==2){
477 xbeam=fVert3D.GetXv();
478 ybeam=fVert3D.GetYv();
479 deltaR=fMaxRCut;
05d1294c 480 }
481
70c95f95 482 Int_t nbr=50;
05d1294c 483 Float_t rl=-fCoarseMaxRCut;
484 Float_t rh=fCoarseMaxRCut;
70c95f95 485 Int_t nbz=100;
486 Float_t zl=-fZCutDiamond;
487 Float_t zh=fZCutDiamond;
488 Float_t binsizer=(rh-rl)/nbr;
489 Float_t binsizez=(zh-zl)/nbz;
7340864d 490 Int_t nbrcs=25;
491 Int_t nbzcs=50;
6b4d9537 492 TH3F *h3d = NULL;
493 TH3F *h3dcs = NULL;
494 if(fPileupAlgo !=2){
495 h3d = new TH3F("h3d","xyz distribution",nbr,rl,rh,nbr,rl,rh,nbz,zl,zh);
496 h3dcs = new TH3F("h3dcs","xyz distribution",nbrcs,rl,rh,nbrcs,rl,rh,nbzcs,zl,zh);
497 }
70c95f95 498 // cleanup of the TCLonesArray of tracklets (i.e. fakes are removed)
f5f6da22 499 Int_t *validate = new Int_t [fLines.GetEntriesFast()];
500 for(Int_t i=0; i<fLines.GetEntriesFast();i++)validate[i]=0;
501 for(Int_t i=0; i<fLines.GetEntriesFast()-1;i++){
f5f6da22 502 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
503 for(Int_t j=i+1;j<fLines.GetEntriesFast();j++){
504 AliStrLine *l2 = (AliStrLine*)fLines.At(j);
05d1294c 505 Float_t dca=l1->GetDCA(l2);
506 if(dca > fDCAcut || dca<0.00001) continue;
70c95f95 507 Double_t point[3];
508 Int_t retc = l1->Cross(l2,point);
509 if(retc<0)continue;
6a0d56b8 510 Double_t deltaZ=point[2]-zvert;
511 if(TMath::Abs(deltaZ)>dZmax)continue;
70c95f95 512 Double_t rad=TMath::Sqrt(point[0]*point[0]+point[1]*point[1]);
05d1294c 513 if(rad>fCoarseMaxRCut)continue;
514 Double_t deltaX=point[0]-xbeam;
515 Double_t deltaY=point[1]-ybeam;
05d1294c 516 Double_t raddist=TMath::Sqrt(deltaX*deltaX+deltaY*deltaY);
05d1294c 517 if(raddist>deltaR)continue;
27167524 518 validate[i]=1;
519 validate[j]=1;
6b4d9537 520 if(fPileupAlgo != 2){
521 h3d->Fill(point[0],point[1],point[2]);
522 h3dcs->Fill(point[0],point[1],point[2]);
523 }
70c95f95 524 }
525 }
526
527
528
70c95f95 529 Int_t numbtracklets=0;
f5f6da22 530 for(Int_t i=0; i<fLines.GetEntriesFast();i++)if(validate[i]>=1)numbtracklets++;
6b4d9537 531 if(numbtracklets<2){
532 delete [] validate;
533 if(fPileupAlgo != 2){
534 delete h3d;
535 delete h3dcs;
536 }
537 return retcode;
538 }
70c95f95 539
f5f6da22 540 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
541 if(validate[i]<1)fLines.RemoveAt(i);
70c95f95 542 }
f5f6da22 543 fLines.Compress();
544 AliDebug(1,Form("Number of tracklets (after compress)%d ",fLines.GetEntriesFast()));
70c95f95 545 delete [] validate;
546
6b4d9537 547 // Exit here if Pileup Algorithm 2 has been chosen
548 if(fPileupAlgo == 2)return 0;
549 //
550
551
7340864d 552 // Find peaks in histos
05d1294c 553
70c95f95 554 Double_t peak[3]={0.,0.,0.};
7340864d 555 Int_t ntrkl,ntimes;
556 FindPeaks(h3d,peak,ntrkl,ntimes);
70c95f95 557 delete h3d;
558
7340864d 559 if(optCuts==0 && ntrkl<=2){
560 ntrkl=0;
561 ntimes=0;
562 FindPeaks(h3dcs,peak,ntrkl,ntimes);
563 binsizer=(rh-rl)/nbrcs;
564 binsizez=(zh-zl)/nbzcs;
565 if(ntrkl==1 || ntimes>1){delete h3dcs; return retcode;}
566 }
567 delete h3dcs;
568
70c95f95 569 // Second selection loop
7340864d 570
70c95f95 571 Float_t bs=(binsizer+binsizez)/2.;
f5f6da22 572 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
573 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
574 if(l1->GetDistFromPoint(peak)>2.5*bs)fLines.RemoveAt(i);
70c95f95 575 }
f5f6da22 576 fLines.Compress();
577 AliDebug(1,Form("Number of tracklets (after 2nd compression) %d",fLines.GetEntriesFast()));
70c95f95 578
f5f6da22 579 if(fLines.GetEntriesFast()>1){
27167524 580 // find a first candidate for the primary vertex
f5f6da22 581 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
70c95f95 582 // make a further selection on tracklets based on this first candidate
27167524 583 fVert3D.GetXYZ(peak);
584 AliDebug(1,Form("FIRST V candidate: %f ; %f ; %f",peak[0],peak[1],peak[2]));
f5f6da22 585 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
586 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
587 if(l1->GetDistFromPoint(peak)> fDCAcut)fLines.RemoveAt(i);
70c95f95 588 }
f5f6da22 589 fLines.Compress();
590 AliDebug(1,Form("Number of tracklets (after 3rd compression) %d",fLines.GetEntriesFast()));
591 if(fLines.GetEntriesFast()>1) retcode=0; // this new tracklet selection is used
27167524 592 else retcode =1; // the previous tracklet selection will be used
70c95f95 593 }
594 else {
595 retcode = 0;
596 }
597 return retcode;
598}
599
6a0d56b8 600//________________________________________________________
601void AliITSVertexer3D::SetMeanPPtSelTracks(Float_t fieldTesla){
602 // Sets mean values of P and Pt based on the field
603 if(TMath::Abs(fieldTesla-0.5)<0.01){
604 SetMeanPSelTracks(0.885);
605 SetMeanPtSelTracks(0.630);
606 }else if(TMath::Abs(fieldTesla-0.4)<0.01){
607 SetMeanPSelTracks(0.805);
608 SetMeanPtSelTracks(0.580);
609 }else if(TMath::Abs(fieldTesla-0.2)<0.01){
610 SetMeanPSelTracks(0.740);
611 SetMeanPtSelTracks(0.530);
612 }else if(fieldTesla<0.00001){
613 SetMeanPSelTracks(0.730);
614 SetMeanPtSelTracks(0.510);
615 }else{
616 SetMeanPSelTracks();
617 SetMeanPtSelTracks();
70c95f95 618 }
70c95f95 619}
620
7340864d 621//________________________________________________________
622void AliITSVertexer3D::FindPeaks(TH3F* histo, Double_t *peak, Int_t &nOfTracklets, Int_t &nOfTimes){
623 // Finds bin with max contents in 3D histo of tracket intersections
624 TAxis *xax = histo->GetXaxis();
625 TAxis *yax = histo->GetYaxis();
626 TAxis *zax = histo->GetZaxis();
627 peak[0]=0.;
628 peak[1]=0.;
629 peak[2]=0.;
630 nOfTracklets = 0;
631 nOfTimes=0;
632 for(Int_t i=xax->GetFirst();i<=xax->GetLast();i++){
633 Float_t xval = xax->GetBinCenter(i);
634 for(Int_t j=yax->GetFirst();j<=yax->GetLast();j++){
635 Float_t yval = yax->GetBinCenter(j);
636 for(Int_t k=zax->GetFirst();k<=zax->GetLast();k++){
637 Float_t zval = zax->GetBinCenter(k);
638 Int_t bc =(Int_t)histo->GetBinContent(i,j,k);
639 if(bc>nOfTracklets){
640 nOfTracklets = bc;
641 peak[2] = zval;
642 peak[1] = yval;
643 peak[0] = xval;
644 nOfTimes = 1;
06a7cbee 645 }else if(bc==nOfTracklets){
7340864d 646 nOfTimes++;
647 }
648 }
649 }
650 }
7340864d 651}
70c95f95 652
cd1c2af1 653//________________________________________________________
654void AliITSVertexer3D::MarkUsedClusters(){
655 // Mark clusters of tracklets used in vertex claulation
656 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
657 AliStrLine *lin = (AliStrLine*)fLines.At(i);
658 Int_t idClu1=lin->GetIdPoint(0);
659 Int_t idClu2=lin->GetIdPoint(1);
660 fUsedCluster.SetBitNumber(idClu1);
661 fUsedCluster.SetBitNumber(idClu2);
662 }
663}
664//________________________________________________________
665Int_t AliITSVertexer3D::RemoveTracklets(){
666 // Remove trackelts close to first found vertex
667 Double_t vert[3]={fVert3D.GetXv(),fVert3D.GetYv(),fVert3D.GetZv()};
668 Int_t nRemoved=0;
669 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
670 AliStrLine *lin = (AliStrLine*)fLines.At(i);
671 if(lin->GetDistFromPoint(vert)<fDCAforPileup){
672 Int_t idClu1=lin->GetIdPoint(0);
673 Int_t idClu2=lin->GetIdPoint(1);
674 fUsedCluster.SetBitNumber(idClu1);
675 fUsedCluster.SetBitNumber(idClu2);
676 fLines.RemoveAt(i);
677 ++nRemoved;
678 }
679 }
680 fLines.Compress();
681 return nRemoved;
682}
683//________________________________________________________
684void AliITSVertexer3D::FindOther3DVertices(TTree *itsClusterTree){
685 // pileup identification based on 3D vertexing with not used clusters
686 MarkUsedClusters();
687 fLines.Clear("C");
688 Int_t nolines = FindTracklets(itsClusterTree,2);
689 if(nolines>=2){
690 Int_t nr=RemoveTracklets();
691 nolines-=nr;
692 if(nolines>=2){
693 Int_t rc=Prepare3DVertex(2);
694 if(rc==0){
695 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
696 if(fVert3D.GetNContributors()>=fMinTrackletsForPilup){
697 fIsPileup=kTRUE;
6b4d9537 698 fNoVertices=2;
699 fVertArray = new AliESDVertex[2];
700 fVertArray[0]=(*fCurrentVertex);
701 fVertArray[1]=fVert3D;
cd1c2af1 702 fZpuv=fVert3D.GetZv();
703 fNTrpuv=fVert3D.GetNContributors();
704 }
705 }
706 }
707 }
708}
709//______________________________________________________________________
710void AliITSVertexer3D::PileupFromZ(){
711 // Calls the pileup algorithm of ALiITSVertexerZ
712 Int_t binmin, binmax;
713 Int_t nPeaks=AliITSVertexerZ::GetPeakRegion(fZHisto,binmin,binmax);
714 if(nPeaks==2)AliWarning("2 peaks found");
715 Int_t firstPeakCont=0;
716 Float_t firstPeakPos=0.;
717 for(Int_t i=binmin-1;i<=binmax+1;i++){
6b4d9537 718 firstPeakCont+=static_cast<Int_t>(fZHisto->GetBinContent(i));
cd1c2af1 719 firstPeakPos+=fZHisto->GetBinContent(i)*fZHisto->GetBinCenter(i);
720 }
73315c4a 721 if(firstPeakCont>0){
722 firstPeakPos/=firstPeakCont;
723 Int_t ncontr2=0;
724 if(firstPeakCont>fMinTrackletsForPilup){
725 Float_t secPeakPos;
726 ncontr2=AliITSVertexerZ::FindSecondPeak(fZHisto,binmin,binmax,secPeakPos);
727 if(ncontr2>=fMinTrackletsForPilup){
728 fIsPileup=kTRUE;
6b4d9537 729 fNoVertices=2;
730 AliESDVertex secondVert(secPeakPos,0.1,ncontr2);
731 fVertArray = new AliESDVertex[2];
732 fVertArray[0]=(*fCurrentVertex);
733 fVertArray[1]=secondVert;
73315c4a 734 fZpuv=secPeakPos;
735 fNTrpuv=ncontr2;
736 }
cd1c2af1 737 }
738 }
739}
70c95f95 740//________________________________________________________
741void AliITSVertexer3D::PrintStatus() const {
742 // Print current status
6a0d56b8 743 printf("=======================================================\n");
744 printf("Loose cut on Delta Phi %f\n",fCoarseDiffPhiCut);
745 printf("Cut on tracklet DCA to Z axis %f\n",fCoarseMaxRCut);
746 printf("Cut on tracklet DCA to beam axis %f\n",fMaxRCut);
747 printf("Cut on diamond (Z) %f\n",fZCutDiamond);
748 printf("Cut on DCA - tracklet to tracklet and to vertex %f\n",fDCAcut);
cd1c2af1 749 printf("Max Phi difference: %f\n",fDiffPhiMax);
750 printf("Pileup algo: %d\n",fPileupAlgo);
751 printf("Min DCA to 1st vetrtex for pileup: %f\n",fDCAforPileup);
6a0d56b8 752 printf("=======================================================\n");
70c95f95 753}