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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//______________________________________________________________________
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.),
c238ba33 57 fDiffPhiforPileup(0.),
7d766abb 58 fBinSizeR(0.),
59 fBinSizeZ(0.),
60 fPileupAlgo(0)
6a0d56b8 61{
70c95f95 62 // Default constructor
63 SetCoarseDiffPhiCut();
6b4d9537 64 SetFineDiffPhiCut();
65 SetCutOnPairs();
05d1294c 66 SetCoarseMaxRCut();
70c95f95 67 SetMaxRCut();
68 SetZCutDiamond();
05d1294c 69 SetMaxZCut();
7203e11a 70 SetDCACut();
70c95f95 71 SetDiffPhiMax();
6a0d56b8 72 SetMeanPSelTracks();
73 SetMeanPtSelTracks();
cd1c2af1 74 SetMinDCAforPileup();
c238ba33 75 SetDeltaPhiforPileup();
cd1c2af1 76 SetPileupAlgo();
7d766abb 77 SetBinSizeR();
78 SetBinSizeZ();
242c8025 79 Double_t binsize=0.02; // default 200 micron
cd1c2af1 80 Int_t nbins=static_cast<Int_t>(1+2*fZCutDiamond/binsize);
81 fZHisto=new TH1F("hz","",nbins,-fZCutDiamond,-fZCutDiamond+binsize*nbins);
70c95f95 82}
83
70c95f95 84//______________________________________________________________________
85AliITSVertexer3D::~AliITSVertexer3D() {
86 // Destructor
f5f6da22 87 fLines.Clear("C");
cd1c2af1 88 if(fZHisto) delete fZHisto;
70c95f95 89}
90
27167524 91//______________________________________________________________________
92void AliITSVertexer3D::ResetVert3D(){
93 //
6b4d9537 94 ResetVertex();
27167524 95 fVert3D.SetXv(0.);
96 fVert3D.SetYv(0.);
97 fVert3D.SetZv(0.);
98 fVert3D.SetDispersion(0.);
99 fVert3D.SetNContributors(0);
cd1c2af1 100 fUsedCluster.ResetAllBits(0);
27167524 101}
70c95f95 102//______________________________________________________________________
308c2f7c 103AliESDVertex* AliITSVertexer3D::FindVertexForCurrentEvent(TTree *itsClusterTree){
70c95f95 104 // Defines the AliESDVertex for the current event
27167524 105 ResetVert3D();
308c2f7c 106 AliDebug(1,"FindVertexForCurrentEvent - 3D - PROCESSING NEXT EVENT");
6b4d9537 107 fLines.Clear("C");
108 fCurrentVertex = NULL;
70c95f95 109
308c2f7c 110 Int_t nolines = FindTracklets(itsClusterTree,0);
0b7bac55 111 if(nolines>=2){
112 Int_t rc=Prepare3DVertex(0);
6b4d9537 113 if(fPileupAlgo == 2 && rc == 0) FindVertex3DIterative();
114 else if(fPileupAlgo<2 && rc == 0) FindVertex3D(itsClusterTree);
0b7bac55 115 }
6b4d9537 116
0b7bac55 117 if(!fCurrentVertex){
118 AliITSVertexerZ vertz(GetNominalPos()[0],GetNominalPos()[1]);
b96ee725 119 vertz.SetDetTypeRec(GetDetTypeRec());
0b7bac55 120 AliDebug(1,"Call Vertexer Z\n");
cc282e54 121 vertz.SetLowLimit(-fZCutDiamond);
122 vertz.SetHighLimit(fZCutDiamond);
0b7bac55 123 AliESDVertex* vtxz = vertz.FindVertexForCurrentEvent(itsClusterTree);
124 if(vtxz){
125 Double_t position[3]={GetNominalPos()[0],GetNominalPos()[1],vtxz->GetZv()};
126 Double_t covmatrix[6];
127 vtxz->GetCovMatrix(covmatrix);
128 Double_t chi2=99999.;
129 Int_t nContr=vtxz->GetNContributors();
130 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
131 fCurrentVertex->SetTitle("vertexer: Z");
132 fCurrentVertex->SetName("SPDVertexZ");
133 delete vtxz;
0b7bac55 134 }
135
70c95f95 136 }
308c2f7c 137 FindMultiplicity(itsClusterTree);
70c95f95 138 return fCurrentVertex;
139}
140
6b4d9537 141//______________________________________________________________________
142void AliITSVertexer3D::FindVertex3D(TTree *itsClusterTree){
143 // 3D algorithm
6b4d9537 144 /* uncomment to debug
145 printf("Vertex found in first iteration:\n");
146 fVert3D.Print();
147 printf("Start second iteration\n");
148 end of debug lines */
149 if(fVert3D.GetNContributors()>0){
150 fLines.Clear("C");
151 Int_t nolines = FindTracklets(itsClusterTree,1);
152 if(nolines>=2){
153 Int_t rc=Prepare3DVertex(1);
2ecf7a6f 154 if(rc!=0) fVert3D.SetNContributors(0); // exclude this vertex
6b4d9537 155 }
156 }
157 /* uncomment to debug
158 printf("Vertex found in second iteration:\n");
159 fVert3D.Print();
160 end of debug lines */
161
0496a544 162 Double_t vRadius=TMath::Sqrt(fVert3D.GetXv()*fVert3D.GetXv()+fVert3D.GetYv()*fVert3D.GetYv());
6b4d9537 163 if(vRadius<GetPipeRadius() && fVert3D.GetNContributors()>0){
164 Double_t position[3]={fVert3D.GetXv(),fVert3D.GetYv(),fVert3D.GetZv()};
165 Double_t covmatrix[6];
166 fVert3D.GetCovMatrix(covmatrix);
167 Double_t chi2=99999.;
168 Int_t nContr=fVert3D.GetNContributors();
169 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
170 fCurrentVertex->SetTitle("vertexer: 3D");
171 fCurrentVertex->SetName("SPDVertex3D");
172 fCurrentVertex->SetDispersion(fVert3D.GetDispersion());
173 fNoVertices=1;
174
175 switch(fPileupAlgo){
176 case 0: PileupFromZ(); break;
177 case 1: FindOther3DVertices(itsClusterTree); break;
178 default: AliError("Wrong pileup algorithm"); break;
179 }
180 if(fNoVertices==1){
181 fVertArray = new AliESDVertex[1];
182 fVertArray[0]=(*fCurrentVertex);
183 }
184 }
185}
186
187//______________________________________________________________________
188void AliITSVertexer3D::FindVertex3DIterative(){
189 // Defines the AliESDVertex for the current event
190 Int_t numsor=fLines.GetEntriesFast()*(fLines.GetEntriesFast()-1)/2;
191 //cout<<"AliITSVertexer3D::FindVertexForCurentEvent: Number of tracklets selected for vertexing "<<fLines.GetEntriesFast()<<"; Number of pairs: "<<numsor<<endl;
192 AliITSSortTrkl srt(fLines,numsor,fCutOnPairs,fCoarseMaxRCut);
193 srt.FindClusters();
194 AliInfo(Form("Number of vertices: %d",srt.GetNumberOfClusters()));
195
196 fNoVertices = srt.GetNumberOfClusters();
197 //printf("fNoVertices = %d \n",fNoVertices);
198 if(fNoVertices>0){
199 fVertArray = new AliESDVertex[fNoVertices];
200 for(Int_t kk=0; kk<srt.GetNumberOfClusters(); kk++){
201 Int_t size = 0;
202 Int_t *labels = srt.GetTrackletsLab(kk,size);
203 /*
204 Int_t *pairs = srt.GetClusters(kk);
205 Int_t nopai = srt.GetSizeOfCluster(kk);
206 cout<<"***** Vertex number "<<kk<<". Pairs: \n";
207 for(Int_t jj=0;jj<nopai;jj++){
208 cout<<pairs[jj]<<" - ";
209 if(jj>0 & jj%8==0)cout<<endl;
210 }
211 cout<<endl;
212 cout<<"***** Vertex number "<<kk<<". Labels: \n";
213 */
214 AliStrLine **tclo = new AliStrLine* [size];
215 for(Int_t jj=0;jj<size;jj++){
216 // cout<<labels[jj]<<" - ";
217 // if(jj>0 & jj%8==0)cout<<endl;
218 tclo[jj] = dynamic_cast<AliStrLine*>(fLines[labels[jj]]);
219 }
220 // cout<<endl;
221 delete []labels;
222 fVertArray[kk]=AliVertexerTracks::TrackletVertexFinder(tclo,size);
223 delete [] tclo;
224 // fVertArray[kk].PrintStatus();
225 if(kk == 1){
226 // at least one second vertex is present
227 fIsPileup = kTRUE;
228 fNTrpuv = fVertArray[kk].GetNContributors();
229 fZpuv = fVertArray[kk].GetZv();
230 }
231 }
0496a544 232 Double_t vRadius=TMath::Sqrt(fVertArray[0].GetXv()*fVertArray[0].GetXv()+fVertArray[0].GetYv()*fVertArray[0].GetYv());
6b4d9537 233 if(vRadius<GetPipeRadius() && fVertArray[0].GetNContributors()>0){
234 Double_t position[3]={fVertArray[0].GetXv(),fVertArray[0].GetYv(),fVertArray[0].GetZv()};
235 Double_t covmatrix[6];
236 fVertArray[0].GetCovMatrix(covmatrix);
237 Double_t chi2=99999.;
238 Int_t nContr=fVertArray[0].GetNContributors();
239 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
240 fCurrentVertex->SetTitle("vertexer: 3D");
241 fCurrentVertex->SetName("SPDVertex3D");
242 fCurrentVertex->SetDispersion(fVertArray[0].GetDispersion());
243 }
244 }
245
246}
247
248//______________________________________________________________________
249Bool_t AliITSVertexer3D::DistBetweenVertices(AliESDVertex &a, AliESDVertex &b, Double_t test, Double_t &dist){
250 // method to compare the distance between vertices a and b with "test"
251 //it returns kTRUE is the distance is less or equal to test
252 dist = (a.GetX()-b.GetX()) * (a.GetX()-b.GetX());
253 dist += (a.GetY()-b.GetY()) * (a.GetY()-b.GetY());
254 dist += (a.GetZ()-b.GetZ()) * (a.GetZ()-b.GetZ());
255 dist = TMath::Sqrt(dist);
256 if(dist <= test)return kTRUE;
257 return kFALSE;
258}
259
260
70c95f95 261//______________________________________________________________________
308c2f7c 262Int_t AliITSVertexer3D::FindTracklets(TTree *itsClusterTree, Int_t optCuts){
70c95f95 263 // All the possible combinations between recpoints on layer 1and 2 are
264 // considered. Straight lines (=tracklets)are formed.
265 // The tracklets are processed in Prepare3DVertex
70c95f95 266
6b4d9537 267 if(!GetDetTypeRec())AliFatal("DetTypeRec pointer has not been set");
268
308c2f7c 269 TTree *tR = itsClusterTree;
6b4d9537 270 fDetTypeRec->ResetRecPoints();
06a7cbee 271 fDetTypeRec->SetTreeAddressR(tR);
70c95f95 272 TClonesArray *itsRec = 0;
cd1c2af1 273 if(optCuts==0) fZHisto->Reset();
6b4d9537 274 // gc1 are local and global coordinates for layer 1
0496a544 275 Float_t gc1f[3]={0.,0.,0.};
276 Double_t gc1[3]={0.,0.,0.};
6b4d9537 277 // gc2 are local and global coordinates for layer 2
0496a544 278 Float_t gc2f[3]={0.,0.,0.};
279 Double_t gc2[3]={0.,0.,0.};
70c95f95 280
06a7cbee 281 itsRec = fDetTypeRec->RecPoints();
6b4d9537 282 TBranch *branch = NULL;
70c95f95 283 branch = tR->GetBranch("ITSRecPoints");
6b4d9537 284 if(!branch){
285 AliError("Null pointer for RecPoints branch");
286 return -1;
287 }
70c95f95 288
289 // Set values for cuts
0496a544 290 Double_t xbeam=GetNominalPos()[0];
291 Double_t ybeam=GetNominalPos()[1];
292 Double_t zvert=0.;
293 Double_t deltaPhi=fCoarseDiffPhiCut;
294 Double_t deltaR=fCoarseMaxRCut;
295 Double_t dZmax=fZCutDiamond;
6b4d9537 296 if(fPileupAlgo == 2){
297 deltaPhi=fFineDiffPhiCut;
298 deltaR=fMaxRCut;
299 if(optCuts != 0)AliWarning(Form("fPileupAlgo=2 AND optCuts=%d has been selected. It should be 0",optCuts));
300 } else if(optCuts==1){
27167524 301 xbeam=fVert3D.GetXv();
302 ybeam=fVert3D.GetYv();
303 zvert=fVert3D.GetZv();
70c95f95 304 deltaPhi = fDiffPhiMax;
05d1294c 305 deltaR=fMaxRCut;
306 dZmax=fMaxZCut;
6b4d9537 307 } else if(optCuts==2){
cd1c2af1 308 xbeam=fVert3D.GetXv();
309 ybeam=fVert3D.GetYv();
c238ba33 310 deltaPhi = fDiffPhiforPileup;
cd1c2af1 311 deltaR=fMaxRCut;
70c95f95 312 }
cd1c2af1 313
70c95f95 314 Int_t nrpL1 = 0; // number of rec points on layer 1
315 Int_t nrpL2 = 0; // number of rec points on layer 2
316
317 // By default irstL1=0 and lastL1=79
6a0d56b8 318 Int_t firstL1 = AliITSgeomTGeo::GetModuleIndex(1,1,1);
32e63e47 319 Int_t lastL1 = AliITSgeomTGeo::GetModuleIndex(2,1,1)-1;
6a0d56b8 320 for(Int_t module= firstL1; module<=lastL1;module++){ // count number of recopints on layer 1
70c95f95 321 branch->GetEvent(module);
322 nrpL1+= itsRec->GetEntries();
06a7cbee 323 fDetTypeRec->ResetRecPoints();
70c95f95 324 }
6a0d56b8 325 //By default firstL2=80 and lastL2=239
326 Int_t firstL2 = AliITSgeomTGeo::GetModuleIndex(2,1,1);
32e63e47 327 Int_t lastL2 = AliITSgeomTGeo::GetModuleIndex(3,1,1)-1;
6a0d56b8 328 for(Int_t module= firstL2; module<=lastL2;module++){ // count number of recopints on layer 2
70c95f95 329 branch->GetEvent(module);
330 nrpL2+= itsRec->GetEntries();
06a7cbee 331 fDetTypeRec->ResetRecPoints();
70c95f95 332 }
333 if(nrpL1 == 0 || nrpL2 == 0){
70c95f95 334 return -1;
335 }
cd706e57 336 AliDebug(1,Form("RecPoints on Layer 1,2 = %d, %d\n",nrpL1,nrpL2));
70c95f95 337
338 Double_t a[3]={xbeam,ybeam,0.};
339 Double_t b[3]={xbeam,ybeam,10.};
340 AliStrLine zeta(a,b,kTRUE);
322e007a 341 static Double_t bField=TMath::Abs(AliTracker::GetBz()/10.); //T
6a0d56b8 342 SetMeanPPtSelTracks(bField);
322e007a 343
70c95f95 344 Int_t nolines = 0;
345 // Loop on modules of layer 1
6a0d56b8 346 for(Int_t modul1= firstL1; modul1<=lastL1;modul1++){ // Loop on modules of layer 1
8c42830a 347 if(!fUseModule[modul1]) continue;
27167524 348 UShort_t ladder=int(modul1/4)+1; // ladders are numbered starting from 1
70c95f95 349 branch->GetEvent(modul1);
350 Int_t nrecp1 = itsRec->GetEntries();
f5f6da22 351 static TClonesArray prpl1("AliITSRecPoint",nrecp1);
352 prpl1.SetOwner();
70c95f95 353 for(Int_t j=0;j<nrecp1;j++){
354 AliITSRecPoint *recp = (AliITSRecPoint*)itsRec->At(j);
f5f6da22 355 new(prpl1[j])AliITSRecPoint(*recp);
70c95f95 356 }
06a7cbee 357 fDetTypeRec->ResetRecPoints();
70c95f95 358 for(Int_t j=0;j<nrecp1;j++){
cd1c2af1 359 if(j>kMaxCluPerMod) continue;
360 UShort_t idClu1=modul1*kMaxCluPerMod+j;
361 if(fUsedCluster.TestBitNumber(idClu1)) continue;
f5f6da22 362 AliITSRecPoint *recp1 = (AliITSRecPoint*)prpl1.At(j);
0496a544 363 recp1->GetGlobalXYZ(gc1f);
364 for(Int_t ico=0;ico<3;ico++)gc1[ico]=gc1f[ico];
365
6a0d56b8 366 Double_t phi1 = TMath::ATan2(gc1[1]-ybeam,gc1[0]-xbeam);
70c95f95 367 if(phi1<0)phi1=2*TMath::Pi()+phi1;
27167524 368 for(Int_t ladl2=0 ; ladl2<fLadOnLay2*2+1;ladl2++){
369 for(Int_t k=0;k<4;k++){
370 Int_t ladmod=fLadders[ladder-1]+ladl2;
32e63e47 371 if(ladmod>AliITSgeomTGeo::GetNLadders(2)) ladmod=ladmod-AliITSgeomTGeo::GetNLadders(2);
372 Int_t modul2=AliITSgeomTGeo::GetModuleIndex(2,ladmod,k+1);
8c42830a 373 if(!fUseModule[modul2]) continue;
27167524 374 branch->GetEvent(modul2);
375 Int_t nrecp2 = itsRec->GetEntries();
376 for(Int_t j2=0;j2<nrecp2;j2++){
cd1c2af1 377 if(j2>kMaxCluPerMod) continue;
378 UShort_t idClu2=modul2*kMaxCluPerMod+j2;
379 if(fUsedCluster.TestBitNumber(idClu2)) continue;
6a0d56b8 380 AliITSRecPoint *recp2 = (AliITSRecPoint*)itsRec->At(j2);
0496a544 381 recp2->GetGlobalXYZ(gc2f);
382 for(Int_t ico=0;ico<3;ico++)gc2[ico]=gc2f[ico];
27167524 383 Double_t phi2 = TMath::ATan2(gc2[1]-ybeam,gc2[0]-xbeam);
384 if(phi2<0)phi2=2*TMath::Pi()+phi2;
385 Double_t diff = TMath::Abs(phi2-phi1);
386 if(diff>TMath::Pi())diff=2.*TMath::Pi()-diff;
cd1c2af1 387 if(optCuts==0 && diff<fDiffPhiMax){
0496a544 388 Double_t r1=TMath::Sqrt(gc1[0]*gc1[0]+gc1[1]*gc1[1]);
389 Double_t zc1=gc1[2];
390 Double_t r2=TMath::Sqrt(gc2[0]*gc2[0]+gc2[1]*gc2[1]);
391 Double_t zc2=gc2[2];
392 Double_t zr0=(r2*zc1-r1*zc2)/(r2-r1); //Z @ null radius
cd1c2af1 393 fZHisto->Fill(zr0);
394 }
27167524 395 if(diff>deltaPhi)continue;
6a0d56b8 396 AliStrLine line(gc1,gc2,kTRUE);
27167524 397 Double_t cp[3];
398 Int_t retcode = line.Cross(&zeta,cp);
399 if(retcode<0)continue;
400 Double_t dca = line.GetDCA(&zeta);
401 if(dca<0.) continue;
402 if(dca>deltaR)continue;
403 Double_t deltaZ=cp[2]-zvert;
404 if(TMath::Abs(deltaZ)>dZmax)continue;
6a0d56b8 405
6a0d56b8 406 if(nolines == 0){
f5f6da22 407 if(fLines.GetEntriesFast()>0)fLines.Clear("C");
6a0d56b8 408 }
409 Float_t cov[6];
410 recp2->GetGlobalCov(cov);
411
cd1c2af1 412
0496a544 413 Double_t rad1=TMath::Sqrt(gc1[0]*gc1[0]+gc1[1]*gc1[1]);
414 Double_t rad2=TMath::Sqrt(gc2[0]*gc2[0]+gc2[1]*gc2[1]);
415 Double_t factor=(rad1+rad2)/(rad2-rad1); //factor to account for error on tracklet direction
6a0d56b8 416
0496a544 417 Double_t curvErr=0;
6a0d56b8 418 if(bField>0.00001){
0496a544 419 Double_t curvRadius=fMeanPtSelTrk/(0.3*bField)*100; //cm
440198c1 420 Double_t dRad=TMath::Sqrt((gc1[0]-gc2[0])*(gc1[0]-gc2[0])+(gc1[1]-gc2[1])*(gc1[1]-gc2[1]));
0496a544 421 Double_t aux=dRad/2.+rad1;
6a0d56b8 422 curvErr=TMath::Sqrt(curvRadius*curvRadius-dRad*dRad/4.)-TMath::Sqrt(curvRadius*curvRadius-aux*aux); //cm
423 }
0496a544 424 Double_t sigmasq[3];
6a0d56b8 425 sigmasq[0]=(cov[0]+curvErr*curvErr/2.)*factor*factor;
426 sigmasq[1]=(cov[3]+curvErr*curvErr/2.)*factor*factor;
427 sigmasq[2]=cov[5]*factor*factor;
428
429 // Multiple scattering
0496a544 430 Double_t pOverMass=fMeanPSelTrk/0.140;
431 Double_t beta2=pOverMass*pOverMass/(1+pOverMass*pOverMass);
432 Double_t p2=fMeanPSelTrk*fMeanPSelTrk;
433 Double_t rBP=GetPipeRadius();
434 Double_t dBP=0.08/35.3; // 800 um of Be
435 Double_t dL1=0.01; //approx. 1% of radiation length
436 Double_t theta2BP=14.1*14.1/(beta2*p2*1e6)*dBP;
437 Double_t theta2L1=14.1*14.1/(beta2*p2*1e6)*dL1;
438 Double_t rtantheta1=(rad2-rad1)*TMath::Tan(TMath::Sqrt(theta2L1));
439 Double_t rtanthetaBP=(rad1-rBP)*TMath::Tan(TMath::Sqrt(theta2BP));
6a0d56b8 440 for(Int_t ico=0; ico<3;ico++){
5951029f 441 sigmasq[ico]+=rtantheta1*rtantheta1*factor*factor/3.;
442 sigmasq[ico]+=rtanthetaBP*rtanthetaBP*factor*factor/3.;
6a0d56b8 443 }
0496a544 444 Double_t wmat[9]={1.,0.,0.,0.,1.,0.,0.,0.,1.};
6a0d56b8 445 if(sigmasq[0]!=0.) wmat[0]=1./sigmasq[0];
446 if(sigmasq[1]!=0.) wmat[4]=1./sigmasq[1];
447 if(sigmasq[2]!=0.) wmat[8]=1./sigmasq[2];
cd1c2af1 448 new(fLines[nolines++])AliStrLine(gc1,sigmasq,wmat,gc2,kTRUE,idClu1,idClu2);
6a0d56b8 449
27167524 450 }
06a7cbee 451 fDetTypeRec->ResetRecPoints();
70c95f95 452 }
70c95f95 453 }
454 }
f5f6da22 455 prpl1.Clear();
70c95f95 456 }
457 if(nolines == 0)return -2;
458 return nolines;
459}
460
70c95f95 461//______________________________________________________________________
05d1294c 462Int_t AliITSVertexer3D::Prepare3DVertex(Int_t optCuts){
70c95f95 463 // Finds the 3D vertex information using tracklets
464 Int_t retcode = -1;
465
0496a544 466 Double_t xbeam=GetNominalPos()[0];
467 Double_t ybeam=GetNominalPos()[1];
468 Double_t zvert=0.;
469 Double_t deltaR=fCoarseMaxRCut;
6b4d9537 470 if(fPileupAlgo == 2) {
471 deltaR=fMaxRCut;
472 if(optCuts!=0)AliWarning(Form("fPileupAlgo=2 AND optCuts=%d. It should be 0",optCuts));
473 }
0496a544 474 Double_t dZmax=fZCutDiamond;
cd1c2af1 475 if(optCuts==1){
27167524 476 xbeam=fVert3D.GetXv();
477 ybeam=fVert3D.GetYv();
478 zvert=fVert3D.GetZv();
05d1294c 479 deltaR=fMaxRCut;
480 dZmax=fMaxZCut;
cd1c2af1 481 }else if(optCuts==2){
482 xbeam=fVert3D.GetXv();
483 ybeam=fVert3D.GetYv();
484 deltaR=fMaxRCut;
05d1294c 485 }
486
0496a544 487 Double_t rl=-fCoarseMaxRCut;
488 Double_t rh=fCoarseMaxRCut;
489 Double_t zl=-fZCutDiamond;
490 Double_t zh=fZCutDiamond;
7d766abb 491 Int_t nbr=(Int_t)((rh-rl)/fBinSizeR+0.0001);
492 Int_t nbz=(Int_t)((zh-zl)/fBinSizeZ+0.0001);
493 Int_t nbrcs=(Int_t)((rh-rl)/(fBinSizeR*2.)+0.0001);
494 Int_t nbzcs=(Int_t)((zh-zl)/(fBinSizeZ*2.)+0.0001);
495
6b4d9537 496 TH3F *h3d = NULL;
497 TH3F *h3dcs = NULL;
498 if(fPileupAlgo !=2){
499 h3d = new TH3F("h3d","xyz distribution",nbr,rl,rh,nbr,rl,rh,nbz,zl,zh);
500 h3dcs = new TH3F("h3dcs","xyz distribution",nbrcs,rl,rh,nbrcs,rl,rh,nbzcs,zl,zh);
501 }
70c95f95 502 // cleanup of the TCLonesArray of tracklets (i.e. fakes are removed)
f5f6da22 503 Int_t *validate = new Int_t [fLines.GetEntriesFast()];
504 for(Int_t i=0; i<fLines.GetEntriesFast();i++)validate[i]=0;
505 for(Int_t i=0; i<fLines.GetEntriesFast()-1;i++){
f5f6da22 506 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
507 for(Int_t j=i+1;j<fLines.GetEntriesFast();j++){
508 AliStrLine *l2 = (AliStrLine*)fLines.At(j);
0496a544 509 Double_t dca=l1->GetDCA(l2);
05d1294c 510 if(dca > fDCAcut || dca<0.00001) continue;
70c95f95 511 Double_t point[3];
512 Int_t retc = l1->Cross(l2,point);
513 if(retc<0)continue;
6a0d56b8 514 Double_t deltaZ=point[2]-zvert;
515 if(TMath::Abs(deltaZ)>dZmax)continue;
70c95f95 516 Double_t rad=TMath::Sqrt(point[0]*point[0]+point[1]*point[1]);
05d1294c 517 if(rad>fCoarseMaxRCut)continue;
518 Double_t deltaX=point[0]-xbeam;
519 Double_t deltaY=point[1]-ybeam;
05d1294c 520 Double_t raddist=TMath::Sqrt(deltaX*deltaX+deltaY*deltaY);
05d1294c 521 if(raddist>deltaR)continue;
27167524 522 validate[i]=1;
523 validate[j]=1;
6b4d9537 524 if(fPileupAlgo != 2){
525 h3d->Fill(point[0],point[1],point[2]);
526 h3dcs->Fill(point[0],point[1],point[2]);
527 }
70c95f95 528 }
529 }
530
531
532
70c95f95 533 Int_t numbtracklets=0;
f5f6da22 534 for(Int_t i=0; i<fLines.GetEntriesFast();i++)if(validate[i]>=1)numbtracklets++;
6b4d9537 535 if(numbtracklets<2){
536 delete [] validate;
537 if(fPileupAlgo != 2){
538 delete h3d;
539 delete h3dcs;
540 }
541 return retcode;
542 }
70c95f95 543
f5f6da22 544 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
545 if(validate[i]<1)fLines.RemoveAt(i);
70c95f95 546 }
f5f6da22 547 fLines.Compress();
548 AliDebug(1,Form("Number of tracklets (after compress)%d ",fLines.GetEntriesFast()));
70c95f95 549 delete [] validate;
550
6b4d9537 551 // Exit here if Pileup Algorithm 2 has been chosen
552 if(fPileupAlgo == 2)return 0;
553 //
554
555
7340864d 556 // Find peaks in histos
05d1294c 557
70c95f95 558 Double_t peak[3]={0.,0.,0.};
7340864d 559 Int_t ntrkl,ntimes;
560 FindPeaks(h3d,peak,ntrkl,ntimes);
70c95f95 561 delete h3d;
0496a544 562 Double_t binsizer=(rh-rl)/nbr;
563 Double_t binsizez=(zh-zl)/nbz;
7d766abb 564 if(optCuts==0 && (ntrkl<=2 || ntimes>1)){
7340864d 565 ntrkl=0;
566 ntimes=0;
567 FindPeaks(h3dcs,peak,ntrkl,ntimes);
568 binsizer=(rh-rl)/nbrcs;
569 binsizez=(zh-zl)/nbzcs;
570 if(ntrkl==1 || ntimes>1){delete h3dcs; return retcode;}
571 }
572 delete h3dcs;
573
70c95f95 574 // Second selection loop
7340864d 575
0496a544 576 Double_t bs=(binsizer+binsizez)/2.;
f5f6da22 577 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
578 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
579 if(l1->GetDistFromPoint(peak)>2.5*bs)fLines.RemoveAt(i);
70c95f95 580 }
f5f6da22 581 fLines.Compress();
582 AliDebug(1,Form("Number of tracklets (after 2nd compression) %d",fLines.GetEntriesFast()));
70c95f95 583
f5f6da22 584 if(fLines.GetEntriesFast()>1){
2ecf7a6f 585 retcode=0;
27167524 586 // find a first candidate for the primary vertex
f5f6da22 587 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
70c95f95 588 // make a further selection on tracklets based on this first candidate
27167524 589 fVert3D.GetXYZ(peak);
590 AliDebug(1,Form("FIRST V candidate: %f ; %f ; %f",peak[0],peak[1],peak[2]));
f5f6da22 591 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
592 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
593 if(l1->GetDistFromPoint(peak)> fDCAcut)fLines.RemoveAt(i);
70c95f95 594 }
f5f6da22 595 fLines.Compress();
596 AliDebug(1,Form("Number of tracklets (after 3rd compression) %d",fLines.GetEntriesFast()));
2ecf7a6f 597 if(fLines.GetEntriesFast()>1){// this new tracklet selection is used
598 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
599 }
70c95f95 600 }
601 return retcode;
602}
603
6a0d56b8 604//________________________________________________________
0496a544 605void AliITSVertexer3D::SetMeanPPtSelTracks(Double_t fieldTesla){
5951029f 606 // Sets mean values of Pt based on the field
607 // for P (used in multiple scattering) the most probable value is used
6a0d56b8 608 if(TMath::Abs(fieldTesla-0.5)<0.01){
5951029f 609 SetMeanPSelTracks(0.375);
6a0d56b8 610 SetMeanPtSelTracks(0.630);
611 }else if(TMath::Abs(fieldTesla-0.4)<0.01){
5951029f 612 SetMeanPSelTracks(0.375);
6a0d56b8 613 SetMeanPtSelTracks(0.580);
614 }else if(TMath::Abs(fieldTesla-0.2)<0.01){
5951029f 615 SetMeanPSelTracks(0.375);
6a0d56b8 616 SetMeanPtSelTracks(0.530);
617 }else if(fieldTesla<0.00001){
5951029f 618 SetMeanPSelTracks(0.375);
619 SetMeanPtSelTracks(0.230);
6a0d56b8 620 }else{
621 SetMeanPSelTracks();
622 SetMeanPtSelTracks();
70c95f95 623 }
70c95f95 624}
625
7340864d 626//________________________________________________________
627void AliITSVertexer3D::FindPeaks(TH3F* histo, Double_t *peak, Int_t &nOfTracklets, Int_t &nOfTimes){
628 // Finds bin with max contents in 3D histo of tracket intersections
629 TAxis *xax = histo->GetXaxis();
630 TAxis *yax = histo->GetYaxis();
631 TAxis *zax = histo->GetZaxis();
632 peak[0]=0.;
633 peak[1]=0.;
634 peak[2]=0.;
635 nOfTracklets = 0;
636 nOfTimes=0;
7d766abb 637 Int_t peakbin[3]={0,0,0};
638 Int_t peak2bin[3]={-1,-1,-1};
639 Int_t bc2=-1;
7340864d 640 for(Int_t i=xax->GetFirst();i<=xax->GetLast();i++){
242c8025 641 Double_t xval = xax->GetBinCenter(i);
7340864d 642 for(Int_t j=yax->GetFirst();j<=yax->GetLast();j++){
242c8025 643 Double_t yval = yax->GetBinCenter(j);
7340864d 644 for(Int_t k=zax->GetFirst();k<=zax->GetLast();k++){
242c8025 645 Double_t zval = zax->GetBinCenter(k);
7340864d 646 Int_t bc =(Int_t)histo->GetBinContent(i,j,k);
7d766abb 647 if(bc==0) continue;
7340864d 648 if(bc>nOfTracklets){
7d766abb 649 nOfTracklets=bc;
7340864d 650 peak[2] = zval;
651 peak[1] = yval;
652 peak[0] = xval;
7d766abb 653 peakbin[2] = k;
654 peakbin[1] = j;
655 peakbin[0] = i;
656 peak2bin[2] = -1;
657 peak2bin[1] = -1;
658 peak2bin[0] = -1;
659 bc2=-1;
7340864d 660 nOfTimes = 1;
06a7cbee 661 }else if(bc==nOfTracklets){
7d766abb 662 if(TMath::Abs(i-peakbin[0])<=1 && TMath::Abs(j-peakbin[1])<=1 && TMath::Abs(k-peakbin[2])<=1){
663 peak2bin[2] = k;
664 peak2bin[1] = j;
665 peak2bin[0] = i;
666 bc2=bc;
667 nOfTimes = 1;
668 }else{
669 nOfTimes++;
670 }
7340864d 671 }
672 }
673 }
674 }
7d766abb 675 if(peak2bin[0]>=-1 && bc2!=-1){ // two contiguous peak-cells with same contents
676 peak[0]=0.5*(xax->GetBinCenter(peakbin[0])+xax->GetBinCenter(peak2bin[0]));
677 peak[1]=0.5*(yax->GetBinCenter(peakbin[1])+yax->GetBinCenter(peak2bin[1]));
678 peak[2]=0.5*(zax->GetBinCenter(peakbin[2])+zax->GetBinCenter(peak2bin[2]));
679 nOfTracklets+=bc2;
680 nOfTimes=1;
681 }
7340864d 682}
cd1c2af1 683//________________________________________________________
684void AliITSVertexer3D::MarkUsedClusters(){
685 // Mark clusters of tracklets used in vertex claulation
686 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
687 AliStrLine *lin = (AliStrLine*)fLines.At(i);
688 Int_t idClu1=lin->GetIdPoint(0);
689 Int_t idClu2=lin->GetIdPoint(1);
690 fUsedCluster.SetBitNumber(idClu1);
691 fUsedCluster.SetBitNumber(idClu2);
692 }
693}
694//________________________________________________________
695Int_t AliITSVertexer3D::RemoveTracklets(){
696 // Remove trackelts close to first found vertex
697 Double_t vert[3]={fVert3D.GetXv(),fVert3D.GetYv(),fVert3D.GetZv()};
698 Int_t nRemoved=0;
699 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
700 AliStrLine *lin = (AliStrLine*)fLines.At(i);
701 if(lin->GetDistFromPoint(vert)<fDCAforPileup){
702 Int_t idClu1=lin->GetIdPoint(0);
703 Int_t idClu2=lin->GetIdPoint(1);
704 fUsedCluster.SetBitNumber(idClu1);
705 fUsedCluster.SetBitNumber(idClu2);
706 fLines.RemoveAt(i);
707 ++nRemoved;
708 }
709 }
710 fLines.Compress();
711 return nRemoved;
712}
713//________________________________________________________
714void AliITSVertexer3D::FindOther3DVertices(TTree *itsClusterTree){
715 // pileup identification based on 3D vertexing with not used clusters
716 MarkUsedClusters();
717 fLines.Clear("C");
718 Int_t nolines = FindTracklets(itsClusterTree,2);
719 if(nolines>=2){
720 Int_t nr=RemoveTracklets();
721 nolines-=nr;
722 if(nolines>=2){
723 Int_t rc=Prepare3DVertex(2);
724 if(rc==0){
725 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
726 if(fVert3D.GetNContributors()>=fMinTrackletsForPilup){
727 fIsPileup=kTRUE;
6b4d9537 728 fNoVertices=2;
729 fVertArray = new AliESDVertex[2];
730 fVertArray[0]=(*fCurrentVertex);
731 fVertArray[1]=fVert3D;
cd1c2af1 732 fZpuv=fVert3D.GetZv();
733 fNTrpuv=fVert3D.GetNContributors();
734 }
735 }
736 }
737 }
738}
739//______________________________________________________________________
740void AliITSVertexer3D::PileupFromZ(){
741 // Calls the pileup algorithm of ALiITSVertexerZ
742 Int_t binmin, binmax;
743 Int_t nPeaks=AliITSVertexerZ::GetPeakRegion(fZHisto,binmin,binmax);
744 if(nPeaks==2)AliWarning("2 peaks found");
745 Int_t firstPeakCont=0;
242c8025 746 Double_t firstPeakPos=0.;
cd1c2af1 747 for(Int_t i=binmin-1;i<=binmax+1;i++){
6b4d9537 748 firstPeakCont+=static_cast<Int_t>(fZHisto->GetBinContent(i));
cd1c2af1 749 firstPeakPos+=fZHisto->GetBinContent(i)*fZHisto->GetBinCenter(i);
750 }
73315c4a 751 if(firstPeakCont>0){
752 firstPeakPos/=firstPeakCont;
753 Int_t ncontr2=0;
754 if(firstPeakCont>fMinTrackletsForPilup){
755 Float_t secPeakPos;
756 ncontr2=AliITSVertexerZ::FindSecondPeak(fZHisto,binmin,binmax,secPeakPos);
757 if(ncontr2>=fMinTrackletsForPilup){
758 fIsPileup=kTRUE;
6b4d9537 759 fNoVertices=2;
760 AliESDVertex secondVert(secPeakPos,0.1,ncontr2);
761 fVertArray = new AliESDVertex[2];
762 fVertArray[0]=(*fCurrentVertex);
763 fVertArray[1]=secondVert;
73315c4a 764 fZpuv=secPeakPos;
765 fNTrpuv=ncontr2;
766 }
cd1c2af1 767 }
768 }
769}
70c95f95 770//________________________________________________________
771void AliITSVertexer3D::PrintStatus() const {
772 // Print current status
6a0d56b8 773 printf("=======================================================\n");
774 printf("Loose cut on Delta Phi %f\n",fCoarseDiffPhiCut);
775 printf("Cut on tracklet DCA to Z axis %f\n",fCoarseMaxRCut);
776 printf("Cut on tracklet DCA to beam axis %f\n",fMaxRCut);
777 printf("Cut on diamond (Z) %f\n",fZCutDiamond);
778 printf("Cut on DCA - tracklet to tracklet and to vertex %f\n",fDCAcut);
cd1c2af1 779 printf("Max Phi difference: %f\n",fDiffPhiMax);
780 printf("Pileup algo: %d\n",fPileupAlgo);
781 printf("Min DCA to 1st vetrtex for pileup: %f\n",fDCAforPileup);
6a0d56b8 782 printf("=======================================================\n");
70c95f95 783}