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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"
70c95f95 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
33ClassImp(AliITSVertexer3D)
34
6a0d56b8 35/* $Id$ */
36
70c95f95 37//______________________________________________________________________
38AliITSVertexer3D::AliITSVertexer3D():AliITSVertexer(),
308c2f7c 39fLines("AliStrLine",1000),
70c95f95 40fVert3D(),
41fCoarseDiffPhiCut(0.),
05d1294c 42fCoarseMaxRCut(0.),
70c95f95 43fMaxRCut(0.),
44fZCutDiamond(0.),
05d1294c 45fMaxZCut(0.),
70c95f95 46fDCAcut(0.),
6a0d56b8 47fDiffPhiMax(0.),
48fMeanPSelTrk(0.),
49fMeanPtSelTrk(0.)
50{
70c95f95 51 // Default constructor
52 SetCoarseDiffPhiCut();
05d1294c 53 SetCoarseMaxRCut();
70c95f95 54 SetMaxRCut();
55 SetZCutDiamond();
05d1294c 56 SetMaxZCut();
7203e11a 57 SetDCACut();
70c95f95 58 SetDiffPhiMax();
6a0d56b8 59 SetMeanPSelTracks();
60 SetMeanPtSelTracks();
70c95f95 61}
62
70c95f95 63//______________________________________________________________________
64AliITSVertexer3D::~AliITSVertexer3D() {
65 // Destructor
f5f6da22 66 fLines.Clear("C");
70c95f95 67}
68
27167524 69//______________________________________________________________________
70void AliITSVertexer3D::ResetVert3D(){
71 //
72 fVert3D.SetXv(0.);
73 fVert3D.SetYv(0.);
74 fVert3D.SetZv(0.);
75 fVert3D.SetDispersion(0.);
76 fVert3D.SetNContributors(0);
77}
70c95f95 78//______________________________________________________________________
308c2f7c 79AliESDVertex* AliITSVertexer3D::FindVertexForCurrentEvent(TTree *itsClusterTree){
70c95f95 80 // Defines the AliESDVertex for the current event
27167524 81 ResetVert3D();
308c2f7c 82 AliDebug(1,"FindVertexForCurrentEvent - 3D - PROCESSING NEXT EVENT");
f5f6da22 83 fLines.Clear();
70c95f95 84
308c2f7c 85 Int_t nolines = FindTracklets(itsClusterTree,0);
70c95f95 86 fCurrentVertex = 0;
0b7bac55 87 if(nolines>=2){
88 Int_t rc=Prepare3DVertex(0);
89 if(rc==0) fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
27167524 90 /* uncomment to debug
0b7bac55 91 printf("Vertex found in first iteration:\n");
92 fVert3D.Print();
93 printf("Start second iteration\n");
27167524 94 end of debug lines */
0b7bac55 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 }
d35ad08f 102 }
27167524 103 /* uncomment to debug
0b7bac55 104 printf("Vertex found in second iteration:\n");
105 fVert3D.Print();
106 end of debug lines */
27167524 107
0b7bac55 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 AliESDVertex* vtxz = vertz.FindVertexForCurrentEvent(itsClusterTree);
125 if(vtxz){
126 Double_t position[3]={GetNominalPos()[0],GetNominalPos()[1],vtxz->GetZv()};
127 Double_t covmatrix[6];
128 vtxz->GetCovMatrix(covmatrix);
129 Double_t chi2=99999.;
130 Int_t nContr=vtxz->GetNContributors();
131 fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
132 fCurrentVertex->SetTitle("vertexer: Z");
133 fCurrentVertex->SetName("SPDVertexZ");
134 delete vtxz;
135 // printf("Vertexer Z success\n");
136 }
137
70c95f95 138 }
308c2f7c 139 FindMultiplicity(itsClusterTree);
70c95f95 140 return fCurrentVertex;
141}
142
143//______________________________________________________________________
308c2f7c 144Int_t AliITSVertexer3D::FindTracklets(TTree *itsClusterTree, Int_t optCuts){
70c95f95 145 // All the possible combinations between recpoints on layer 1and 2 are
146 // considered. Straight lines (=tracklets)are formed.
147 // The tracklets are processed in Prepare3DVertex
70c95f95 148 AliITSDetTypeRec detTypeRec;
149
308c2f7c 150 TTree *tR = itsClusterTree;
70c95f95 151 detTypeRec.SetTreeAddressR(tR);
152 TClonesArray *itsRec = 0;
6a0d56b8 153 // lc1 and gc1 are local and global coordinates for layer 1
154 // Float_t lc1[3]={0.,0.,0.};
155 Float_t gc1[3]={0.,0.,0.};
70c95f95 156 // lc2 and gc2 are local and global coordinates for layer 2
6a0d56b8 157 // Float_t lc2[3]={0.,0.,0.};
158 Float_t gc2[3]={0.,0.,0.};
70c95f95 159
160 itsRec = detTypeRec.RecPoints();
161 TBranch *branch;
162 branch = tR->GetBranch("ITSRecPoints");
163
164 // Set values for cuts
ecce5370 165 Float_t xbeam=GetNominalPos()[0];
166 Float_t ybeam=GetNominalPos()[1];
05d1294c 167 Float_t zvert=0.;
70c95f95 168 Float_t deltaPhi=fCoarseDiffPhiCut;
05d1294c 169 Float_t deltaR=fCoarseMaxRCut;
170 Float_t dZmax=fZCutDiamond;
70c95f95 171 if(optCuts){
27167524 172 xbeam=fVert3D.GetXv();
173 ybeam=fVert3D.GetYv();
174 zvert=fVert3D.GetZv();
70c95f95 175 deltaPhi = fDiffPhiMax;
05d1294c 176 deltaR=fMaxRCut;
177 dZmax=fMaxZCut;
70c95f95 178 }
70c95f95 179 Int_t nrpL1 = 0; // number of rec points on layer 1
180 Int_t nrpL2 = 0; // number of rec points on layer 2
181
182 // By default irstL1=0 and lastL1=79
6a0d56b8 183 Int_t firstL1 = AliITSgeomTGeo::GetModuleIndex(1,1,1);
32e63e47 184 Int_t lastL1 = AliITSgeomTGeo::GetModuleIndex(2,1,1)-1;
6a0d56b8 185 for(Int_t module= firstL1; module<=lastL1;module++){ // count number of recopints on layer 1
70c95f95 186 branch->GetEvent(module);
187 nrpL1+= itsRec->GetEntries();
188 detTypeRec.ResetRecPoints();
189 }
6a0d56b8 190 //By default firstL2=80 and lastL2=239
191 Int_t firstL2 = AliITSgeomTGeo::GetModuleIndex(2,1,1);
32e63e47 192 Int_t lastL2 = AliITSgeomTGeo::GetModuleIndex(3,1,1)-1;
6a0d56b8 193 for(Int_t module= firstL2; module<=lastL2;module++){ // count number of recopints on layer 2
70c95f95 194 branch->GetEvent(module);
195 nrpL2+= itsRec->GetEntries();
196 detTypeRec.ResetRecPoints();
197 }
198 if(nrpL1 == 0 || nrpL2 == 0){
70c95f95 199 return -1;
200 }
cd706e57 201 AliDebug(1,Form("RecPoints on Layer 1,2 = %d, %d\n",nrpL1,nrpL2));
70c95f95 202
203 Double_t a[3]={xbeam,ybeam,0.};
204 Double_t b[3]={xbeam,ybeam,10.};
205 AliStrLine zeta(a,b,kTRUE);
6a0d56b8 206 Float_t bField=AliTracker::GetBz()/10.; //T
207 SetMeanPPtSelTracks(bField);
70c95f95 208
209 Int_t nolines = 0;
210 // Loop on modules of layer 1
6a0d56b8 211 for(Int_t modul1= firstL1; modul1<=lastL1;modul1++){ // Loop on modules of layer 1
8c42830a 212 if(!fUseModule[modul1]) continue;
27167524 213 UShort_t ladder=int(modul1/4)+1; // ladders are numbered starting from 1
70c95f95 214 branch->GetEvent(modul1);
215 Int_t nrecp1 = itsRec->GetEntries();
f5f6da22 216 static TClonesArray prpl1("AliITSRecPoint",nrecp1);
217 prpl1.SetOwner();
70c95f95 218 for(Int_t j=0;j<nrecp1;j++){
219 AliITSRecPoint *recp = (AliITSRecPoint*)itsRec->At(j);
f5f6da22 220 new(prpl1[j])AliITSRecPoint(*recp);
70c95f95 221 }
222 detTypeRec.ResetRecPoints();
223 for(Int_t j=0;j<nrecp1;j++){
f5f6da22 224 AliITSRecPoint *recp1 = (AliITSRecPoint*)prpl1.At(j);
70c95f95 225 // Local coordinates of this recpoint
32e63e47 226 /*
6a0d56b8 227 lc[0]=recp1->GetDetLocalX();
228 lc[2]=recp1->GetDetLocalZ();
32e63e47 229 */
6a0d56b8 230 recp1->GetGlobalXYZ(gc1);
231 Double_t phi1 = TMath::ATan2(gc1[1]-ybeam,gc1[0]-xbeam);
70c95f95 232 if(phi1<0)phi1=2*TMath::Pi()+phi1;
27167524 233 for(Int_t ladl2=0 ; ladl2<fLadOnLay2*2+1;ladl2++){
234 for(Int_t k=0;k<4;k++){
235 Int_t ladmod=fLadders[ladder-1]+ladl2;
32e63e47 236 if(ladmod>AliITSgeomTGeo::GetNLadders(2)) ladmod=ladmod-AliITSgeomTGeo::GetNLadders(2);
237 Int_t modul2=AliITSgeomTGeo::GetModuleIndex(2,ladmod,k+1);
8c42830a 238 if(!fUseModule[modul2]) continue;
27167524 239 branch->GetEvent(modul2);
240 Int_t nrecp2 = itsRec->GetEntries();
241 for(Int_t j2=0;j2<nrecp2;j2++){
6a0d56b8 242 AliITSRecPoint *recp2 = (AliITSRecPoint*)itsRec->At(j2);
32e63e47 243 /*
6a0d56b8 244 lc2[0]=recp2->GetDetLocalX();
245 lc2[2]=recp2->GetDetLocalZ();
32e63e47 246 */
6a0d56b8 247 recp2->GetGlobalXYZ(gc2);
27167524 248 Double_t phi2 = TMath::ATan2(gc2[1]-ybeam,gc2[0]-xbeam);
249 if(phi2<0)phi2=2*TMath::Pi()+phi2;
250 Double_t diff = TMath::Abs(phi2-phi1);
251 if(diff>TMath::Pi())diff=2.*TMath::Pi()-diff;
252 if(diff>deltaPhi)continue;
6a0d56b8 253 AliStrLine line(gc1,gc2,kTRUE);
27167524 254 Double_t cp[3];
255 Int_t retcode = line.Cross(&zeta,cp);
256 if(retcode<0)continue;
257 Double_t dca = line.GetDCA(&zeta);
258 if(dca<0.) continue;
259 if(dca>deltaR)continue;
260 Double_t deltaZ=cp[2]-zvert;
261 if(TMath::Abs(deltaZ)>dZmax)continue;
6a0d56b8 262
6a0d56b8 263 if(nolines == 0){
f5f6da22 264 if(fLines.GetEntriesFast()>0)fLines.Clear("C");
6a0d56b8 265 }
266 Float_t cov[6];
267 recp2->GetGlobalCov(cov);
268
269
270 Float_t rad1=TMath::Sqrt(gc1[0]*gc1[0]+gc1[1]*gc1[1]);
271 Float_t rad2=TMath::Sqrt(gc2[0]*gc2[0]+gc2[1]*gc2[1]);
272 Float_t factor=(rad1+rad2)/(rad2-rad1); //factor to account for error on tracklet direction
273
274 Float_t curvErr=0;
275 if(bField>0.00001){
276 Float_t curvRadius=fMeanPtSelTrk/(0.3*bField)*100; //cm
277 Float_t dRad=TMath::Sqrt(TMath::Power((gc1[0]-gc2[0]),2)+TMath::Power((gc1[1]-gc2[1]),2));
278 Float_t aux=dRad/2.+rad1;
279 curvErr=TMath::Sqrt(curvRadius*curvRadius-dRad*dRad/4.)-TMath::Sqrt(curvRadius*curvRadius-aux*aux); //cm
280 }
281
282 Float_t sigmasq[3];
283 sigmasq[0]=(cov[0]+curvErr*curvErr/2.)*factor*factor;
284 sigmasq[1]=(cov[3]+curvErr*curvErr/2.)*factor*factor;
285 sigmasq[2]=cov[5]*factor*factor;
286
287 // Multiple scattering
288 Float_t beta=1.;
289 Float_t beta2=beta*beta;
290 Float_t p2=fMeanPSelTrk*fMeanPSelTrk;
291 Float_t rBP=GetPipeRadius();
292 Float_t dBP=0.08/35.3; // 800 um of Be
293 Float_t dL1=0.01; //approx. 1% of radiation length
294 Float_t theta2BP=14.1*14.1/(beta2*p2*1e6)*TMath::Abs(dBP);
295 Float_t theta2L1=14.1*14.1/(beta2*p2*1e6)*TMath::Abs(dL1);
296 Float_t thetaBP=TMath::Sqrt(theta2BP);
297 Float_t thetaL1=TMath::Sqrt(theta2L1);
298// Float_t geomfac[3];
299// geomfac[0]=sin(phi1)*sin(phi1);
300// geomfac[1]=cos(phi1)*cos(phi1);
301// Float_t tgth=(gc2[2]-gc1[2])/(rad2-rad1);
302// geomfac[2]=1+tgth*tgth;
303 for(Int_t ico=0; ico<3;ico++){
304// printf("Error on coord. %d due to cov matrix+curvErr=%f\n",ico,sigmasq[ico]);
305// // sigmasq[ico]+=rad1*rad1*geomfac[ico]*theta2L1/2; // multiple scattering in layer 1
306// // sigmasq[ico]+=rBP*rBP*geomfac[ico]*theta2BP/2; // multiple scattering in beam pipe
307 sigmasq[ico]+=TMath::Power(rad1*TMath::Tan(thetaL1),2)/3.;
308 sigmasq[ico]+=TMath::Power(rBP*TMath::Tan(thetaBP),2)/3.;
309
310// printf("Multipl. scatt. contr %d = %f (LAY1), %f (BP)\n",ico,rad1*rad1*geomfac[ico]*theta2L1/2,rBP*rBP*geomfac[ico]*theta2BP/2);
311// printf("Total error on coord %d = %f\n",ico,sigmasq[ico]);
312 }
313 Float_t wmat[9]={1.,0.,0.,0.,1.,0.,0.,0.,1.};
314 if(sigmasq[0]!=0.) wmat[0]=1./sigmasq[0];
315 if(sigmasq[1]!=0.) wmat[4]=1./sigmasq[1];
316 if(sigmasq[2]!=0.) wmat[8]=1./sigmasq[2];
f5f6da22 317 new(fLines[nolines++])AliStrLine(gc1,sigmasq,wmat,gc2,kTRUE);
6a0d56b8 318
27167524 319 }
320 detTypeRec.ResetRecPoints();
70c95f95 321 }
70c95f95 322 }
323 }
f5f6da22 324 prpl1.Clear();
70c95f95 325 }
326 if(nolines == 0)return -2;
327 return nolines;
328}
329
70c95f95 330//______________________________________________________________________
05d1294c 331Int_t AliITSVertexer3D::Prepare3DVertex(Int_t optCuts){
70c95f95 332 // Finds the 3D vertex information using tracklets
333 Int_t retcode = -1;
334
ecce5370 335 Float_t xbeam=GetNominalPos()[0];
336 Float_t ybeam=GetNominalPos()[1];
05d1294c 337 Float_t zvert=0.;
338 Float_t deltaR=fCoarseMaxRCut;
339 Float_t dZmax=fZCutDiamond;
340 if(optCuts){
27167524 341 xbeam=fVert3D.GetXv();
342 ybeam=fVert3D.GetYv();
343 zvert=fVert3D.GetZv();
05d1294c 344 deltaR=fMaxRCut;
345 dZmax=fMaxZCut;
346 }
347
70c95f95 348 Int_t nbr=50;
05d1294c 349 Float_t rl=-fCoarseMaxRCut;
350 Float_t rh=fCoarseMaxRCut;
70c95f95 351 Int_t nbz=100;
352 Float_t zl=-fZCutDiamond;
353 Float_t zh=fZCutDiamond;
354 Float_t binsizer=(rh-rl)/nbr;
355 Float_t binsizez=(zh-zl)/nbz;
356 TH3F *h3d = new TH3F("h3d","xyz distribution",nbr,rl,rh,nbr,rl,rh,nbz,zl,zh);
7340864d 357 Int_t nbrcs=25;
358 Int_t nbzcs=50;
359 TH3F *h3dcs = new TH3F("h3dcs","xyz distribution",nbrcs,rl,rh,nbrcs,rl,rh,nbzcs,zl,zh);
70c95f95 360
70c95f95 361 // cleanup of the TCLonesArray of tracklets (i.e. fakes are removed)
f5f6da22 362 Int_t *validate = new Int_t [fLines.GetEntriesFast()];
363 for(Int_t i=0; i<fLines.GetEntriesFast();i++)validate[i]=0;
364 for(Int_t i=0; i<fLines.GetEntriesFast()-1;i++){
f5f6da22 365 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
366 for(Int_t j=i+1;j<fLines.GetEntriesFast();j++){
367 AliStrLine *l2 = (AliStrLine*)fLines.At(j);
05d1294c 368 Float_t dca=l1->GetDCA(l2);
369 if(dca > fDCAcut || dca<0.00001) continue;
70c95f95 370 Double_t point[3];
371 Int_t retc = l1->Cross(l2,point);
372 if(retc<0)continue;
6a0d56b8 373 Double_t deltaZ=point[2]-zvert;
374 if(TMath::Abs(deltaZ)>dZmax)continue;
70c95f95 375 Double_t rad=TMath::Sqrt(point[0]*point[0]+point[1]*point[1]);
05d1294c 376 if(rad>fCoarseMaxRCut)continue;
377 Double_t deltaX=point[0]-xbeam;
378 Double_t deltaY=point[1]-ybeam;
05d1294c 379 Double_t raddist=TMath::Sqrt(deltaX*deltaX+deltaY*deltaY);
05d1294c 380 if(raddist>deltaR)continue;
27167524 381 validate[i]=1;
382 validate[j]=1;
70c95f95 383 h3d->Fill(point[0],point[1],point[2]);
7340864d 384 h3dcs->Fill(point[0],point[1],point[2]);
70c95f95 385 }
386 }
387
388
389
70c95f95 390 Int_t numbtracklets=0;
f5f6da22 391 for(Int_t i=0; i<fLines.GetEntriesFast();i++)if(validate[i]>=1)numbtracklets++;
70c95f95 392 if(numbtracklets<2){delete [] validate; delete h3d; return retcode; }
393
f5f6da22 394 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
395 if(validate[i]<1)fLines.RemoveAt(i);
70c95f95 396 }
f5f6da22 397 fLines.Compress();
398 AliDebug(1,Form("Number of tracklets (after compress)%d ",fLines.GetEntriesFast()));
70c95f95 399 delete [] validate;
400
7340864d 401 // Find peaks in histos
05d1294c 402
70c95f95 403 Double_t peak[3]={0.,0.,0.};
7340864d 404 Int_t ntrkl,ntimes;
405 FindPeaks(h3d,peak,ntrkl,ntimes);
70c95f95 406 delete h3d;
407
7340864d 408 if(optCuts==0 && ntrkl<=2){
409 ntrkl=0;
410 ntimes=0;
411 FindPeaks(h3dcs,peak,ntrkl,ntimes);
412 binsizer=(rh-rl)/nbrcs;
413 binsizez=(zh-zl)/nbzcs;
414 if(ntrkl==1 || ntimes>1){delete h3dcs; return retcode;}
415 }
416 delete h3dcs;
417
70c95f95 418 // Second selection loop
7340864d 419
70c95f95 420 Float_t bs=(binsizer+binsizez)/2.;
f5f6da22 421 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
422 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
423 if(l1->GetDistFromPoint(peak)>2.5*bs)fLines.RemoveAt(i);
70c95f95 424 }
f5f6da22 425 fLines.Compress();
426 AliDebug(1,Form("Number of tracklets (after 2nd compression) %d",fLines.GetEntriesFast()));
70c95f95 427
f5f6da22 428 if(fLines.GetEntriesFast()>1){
27167524 429 // find a first candidate for the primary vertex
f5f6da22 430 fVert3D=AliVertexerTracks::TrackletVertexFinder(&fLines,0);
70c95f95 431 // make a further selection on tracklets based on this first candidate
27167524 432 fVert3D.GetXYZ(peak);
433 AliDebug(1,Form("FIRST V candidate: %f ; %f ; %f",peak[0],peak[1],peak[2]));
f5f6da22 434 for(Int_t i=0; i<fLines.GetEntriesFast();i++){
435 AliStrLine *l1 = (AliStrLine*)fLines.At(i);
436 if(l1->GetDistFromPoint(peak)> fDCAcut)fLines.RemoveAt(i);
70c95f95 437 }
f5f6da22 438 fLines.Compress();
439 AliDebug(1,Form("Number of tracklets (after 3rd compression) %d",fLines.GetEntriesFast()));
440 if(fLines.GetEntriesFast()>1) retcode=0; // this new tracklet selection is used
27167524 441 else retcode =1; // the previous tracklet selection will be used
70c95f95 442 }
443 else {
444 retcode = 0;
445 }
446 return retcode;
447}
448
6a0d56b8 449//________________________________________________________
450void AliITSVertexer3D::SetMeanPPtSelTracks(Float_t fieldTesla){
451 // Sets mean values of P and Pt based on the field
452 if(TMath::Abs(fieldTesla-0.5)<0.01){
453 SetMeanPSelTracks(0.885);
454 SetMeanPtSelTracks(0.630);
455 }else if(TMath::Abs(fieldTesla-0.4)<0.01){
456 SetMeanPSelTracks(0.805);
457 SetMeanPtSelTracks(0.580);
458 }else if(TMath::Abs(fieldTesla-0.2)<0.01){
459 SetMeanPSelTracks(0.740);
460 SetMeanPtSelTracks(0.530);
461 }else if(fieldTesla<0.00001){
462 SetMeanPSelTracks(0.730);
463 SetMeanPtSelTracks(0.510);
464 }else{
465 SetMeanPSelTracks();
466 SetMeanPtSelTracks();
70c95f95 467 }
70c95f95 468}
469
7340864d 470//________________________________________________________
471void AliITSVertexer3D::FindPeaks(TH3F* histo, Double_t *peak, Int_t &nOfTracklets, Int_t &nOfTimes){
472 // Finds bin with max contents in 3D histo of tracket intersections
473 TAxis *xax = histo->GetXaxis();
474 TAxis *yax = histo->GetYaxis();
475 TAxis *zax = histo->GetZaxis();
476 peak[0]=0.;
477 peak[1]=0.;
478 peak[2]=0.;
479 nOfTracklets = 0;
480 nOfTimes=0;
481 for(Int_t i=xax->GetFirst();i<=xax->GetLast();i++){
482 Float_t xval = xax->GetBinCenter(i);
483 for(Int_t j=yax->GetFirst();j<=yax->GetLast();j++){
484 Float_t yval = yax->GetBinCenter(j);
485 for(Int_t k=zax->GetFirst();k<=zax->GetLast();k++){
486 Float_t zval = zax->GetBinCenter(k);
487 Int_t bc =(Int_t)histo->GetBinContent(i,j,k);
488 if(bc>nOfTracklets){
489 nOfTracklets = bc;
490 peak[2] = zval;
491 peak[1] = yval;
492 peak[0] = xval;
493 nOfTimes = 1;
494 }
495 if(bc==nOfTracklets){
496 nOfTimes++;
497 }
498 }
499 }
500 }
501
502}
70c95f95 503
504//________________________________________________________
505void AliITSVertexer3D::PrintStatus() const {
506 // Print current status
6a0d56b8 507 printf("=======================================================\n");
508 printf("Loose cut on Delta Phi %f\n",fCoarseDiffPhiCut);
509 printf("Cut on tracklet DCA to Z axis %f\n",fCoarseMaxRCut);
510 printf("Cut on tracklet DCA to beam axis %f\n",fMaxRCut);
511 printf("Cut on diamond (Z) %f\n",fZCutDiamond);
512 printf("Cut on DCA - tracklet to tracklet and to vertex %f\n",fDCAcut);
513 printf(" Max Phi difference: %f\n",fDiffPhiMax);
514 printf("=======================================================\n");
70c95f95 515}