ITS/AliITSV0Finder.cxx

   1 /**************************************************************************\r
   2  * Copyright(c) 2007-2009, ALICE Experiment at CERN, All rights reserved. *\r
   3  *                                                                        *\r
   4  * Author: The ALICE Off-line Project.                                    *\r
   5  * Contributors are mentioned in the code where appropriate.              *\r
   6  *                                                                        *\r
   7  * Permission to use, copy, modify and distribute this software and its   *\r
   8  * documentation strictly for non-commercial purposes is hereby granted   *\r
   9  * without fee, provided that the above copyright notice appears in all   *\r
  10  * copies and that both the copyright notice and this permission notice   *\r
  11  * appear in the supporting documentation. The authors make no claims     *\r
  12  * about the suitability of this software for any purpose. It is          *\r
  13  * provided "as is" without express or implied warranty.                  *\r
  14  **************************************************************************/\r
  15 /* $Id$ */\r
  16 \r
  17 //-------------------------------------------------------------------------\r
  18 //      Implementation of the on-the-fly v0 finder for ITS tracker MI\r
  19 //          Origin: Marian Ivanov, CERN, Marian.Ivanov@cern.ch \r
  20 //          Extraction from AliITStrackerMI: Andrea Dainese\r
  21 //          Current support and development: \r
  22 //-------------------------------------------------------------------------\r
  23 \r
  24 #include <TMatrixD.h>\r
  25 #include <TTree.h>\r
  26 #include <TString.h>\r
  27 #include <TRandom.h>\r
  28 #include <TTreeStream.h>\r
  29 \r
  30 \r
  31 #include "AliLog.h"\r
  32 #include "AliESDVertex.h"\r
  33 #include "AliESDEvent.h"\r
  34 #include "AliESDtrack.h"\r
  35 #include "AliV0.h"\r
  36 #include "AliHelix.h"\r
  37 #include "AliITSRecPoint.h"\r
  38 #include "AliITSReconstructor.h"\r
  39 #include "AliITStrackerMI.h"\r
  40 #include "AliITSV0Finder.h"\r
  41 \r
  42 ClassImp(AliITSV0Finder)\r
  43 \r
  44 AliITSV0Finder::AliITSV0Finder() {\r
  45   //Default constructor\r
  46 }\r
  47 //------------------------------------------------------------------------\r
  48 void AliITSV0Finder::UpdateTPCV0(const AliESDEvent *event,\r
  49                                    AliITStrackerMI *tracker)\r
  50 {\r
  51   //\r
  52   //try to update, or reject TPC  V0s\r
  53   //\r
  54   TObjArray *trackHypothesys = tracker->GetTrackHypothesys();\r
  55 \r
  56   Int_t nv0s = event->GetNumberOfV0s();\r
  57   Int_t nitstracks = trackHypothesys->GetEntriesFast();\r
  58 \r
  59   for (Int_t i=0;i<nv0s;i++){\r
  60     AliESDv0 * vertex = event->GetV0(i);\r
  61     Int_t ip = vertex->GetIndex(0);\r
  62     Int_t im = vertex->GetIndex(1);\r
  63     //\r
  64     TObjArray * arrayp = (ip<nitstracks) ? (TObjArray*)trackHypothesys->At(ip):0;\r
  65     TObjArray * arraym = (im<nitstracks) ? (TObjArray*)trackHypothesys->At(im):0;\r
  66     AliITStrackMI * trackp = (arrayp!=0) ? (AliITStrackMI*)arrayp->At(0):0;\r
  67     AliITStrackMI * trackm = (arraym!=0) ? (AliITStrackMI*)arraym->At(0):0;\r
  68     //\r
  69     //\r
  70     if (trackp){\r
  71       if (trackp->GetNumberOfClusters()+trackp->GetNDeadZone()>5.5){\r
  72         if (trackp->GetConstrain()&&trackp->GetChi2MIP(0)<3) vertex->SetStatus(-100);\r
  73         if (!trackp->GetConstrain()&&trackp->GetChi2MIP(0)<2) vertex->SetStatus(-100); \r
  74       }\r
  75     }\r
  76 \r
  77     if (trackm){\r
  78       if (trackm->GetNumberOfClusters()+trackm->GetNDeadZone()>5.5){\r
  79         if (trackm->GetConstrain()&&trackm->GetChi2MIP(0)<3) vertex->SetStatus(-100);\r
  80         if (!trackm->GetConstrain()&&trackm->GetChi2MIP(0)<2) vertex->SetStatus(-100); \r
  81       }\r
  82     }\r
  83     if (vertex->GetStatus()==-100) continue;\r
  84     //\r
  85     Double_t xrp[3]; vertex->GetXYZ(xrp[0],xrp[1],xrp[2]);  //I.B.\r
  86     Int_t clayer = tracker->GetNearestLayer(xrp);                    //I.B.\r
  87     vertex->SetNBefore(clayer);        //\r
  88     vertex->SetChi2Before(9*clayer);   //\r
  89     vertex->SetNAfter(6-clayer);       //\r
  90     vertex->SetChi2After(0);           //\r
  91     //\r
  92     if (clayer >1 ){ // calculate chi2 before vertex\r
  93       Float_t chi2p = 0, chi2m=0;  \r
  94       //\r
  95       if (trackp){\r
  96         for (Int_t ilayer=0;ilayer<clayer;ilayer++){\r
  97           if (trackp->GetClIndex(ilayer)>=0){\r
  98             chi2p+=trackp->GetDy(ilayer)*trackp->GetDy(ilayer)/(trackp->GetSigmaY(ilayer)*trackp->GetSigmaY(ilayer))+\r
  99               trackp->GetDz(ilayer)*trackp->GetDz(ilayer)/(trackp->GetSigmaZ(ilayer)*trackp->GetSigmaZ(ilayer));\r
 100           }\r
 101           else{\r
 102             chi2p+=9;\r
 103           }\r
 104         }\r
 105       }else{\r
 106         chi2p = 9*clayer;\r
 107       }\r
 108       //\r
 109       if (trackm){\r
 110         for (Int_t ilayer=0;ilayer<clayer;ilayer++){\r
 111           if (trackm->GetClIndex(ilayer)>=0){\r
 112             chi2m+=trackm->GetDy(ilayer)*trackm->GetDy(ilayer)/(trackm->GetSigmaY(ilayer)*trackm->GetSigmaY(ilayer))+\r
 113               trackm->GetDz(ilayer)*trackm->GetDz(ilayer)/(trackm->GetSigmaZ(ilayer)*trackm->GetSigmaZ(ilayer));\r
 114           }\r
 115           else{\r
 116             chi2m+=9;\r
 117           }\r
 118         }\r
 119       }else{\r
 120         chi2m = 9*clayer;\r
 121       }\r
 122       vertex->SetChi2Before(TMath::Min(chi2p,chi2m));\r
 123       if (TMath::Min(chi2p,chi2m)/Float_t(clayer)<4) vertex->SetStatus(-10);  // track exist before vertex\r
 124     }\r
 125     \r
 126     if (clayer < 5 ){ // calculate chi2 after vertex\r
 127       Float_t chi2p = 0, chi2m=0;  \r
 128       //\r
 129       if (trackp&&TMath::Abs(trackp->GetTgl())<1.){\r
 130         for (Int_t ilayer=clayer;ilayer<6;ilayer++){\r
 131           if (trackp->GetClIndex(ilayer)>=0){\r
 132             chi2p+=trackp->GetDy(ilayer)*trackp->GetDy(ilayer)/(trackp->GetSigmaY(ilayer)*trackp->GetSigmaY(ilayer))+\r
 133               trackp->GetDz(ilayer)*trackp->GetDz(ilayer)/(trackp->GetSigmaZ(ilayer)*trackp->GetSigmaZ(ilayer));\r
 134           }\r
 135           else{\r
 136             chi2p+=9;\r
 137           }\r
 138         }\r
 139       }else{\r
 140         chi2p = 0;\r
 141       }\r
 142       //\r
 143       if (trackm&&TMath::Abs(trackm->GetTgl())<1.){\r
 144         for (Int_t ilayer=clayer;ilayer<6;ilayer++){\r
 145           if (trackm->GetClIndex(ilayer)>=0){\r
 146             chi2m+=trackm->GetDy(ilayer)*trackm->GetDy(ilayer)/(trackm->GetSigmaY(ilayer)*trackm->GetSigmaY(ilayer))+\r
 147               trackm->GetDz(ilayer)*trackm->GetDz(ilayer)/(trackm->GetSigmaZ(ilayer)*trackm->GetSigmaZ(ilayer));\r
 148           }\r
 149           else{\r
 150             chi2m+=9;\r
 151           }\r
 152         }\r
 153       }else{\r
 154         chi2m = 0;\r
 155       }\r
 156       vertex->SetChi2After(TMath::Max(chi2p,chi2m));\r
 157       if (TMath::Max(chi2m,chi2p)/Float_t(6-clayer)>9) vertex->SetStatus(-20);  // track not found in ITS\r
 158     }\r
 159   }\r
 160   //\r
 161 }\r
 162 //------------------------------------------------------------------------\r
 163 void AliITSV0Finder::FindV02(AliESDEvent *event,\r
 164                                AliITStrackerMI *tracker) \r
 165 {\r
 166   //\r
 167   // V0 finder\r
 168   //\r
 169   //  Cuts on DCA -  R dependent\r
 170   //          max distance DCA between 2 tracks cut \r
 171   //          maxDist = TMath::Min(kMaxDist,kMaxDist0+pvertex->GetRr()*kMaxDist);\r
 172   //\r
 173   const Float_t kMaxDist0      = 0.1;    \r
 174   const Float_t kMaxDist1      = 0.1;     \r
 175   const Float_t kMaxDist       = 1;\r
 176   const Float_t kMinPointAngle  = 0.85;\r
 177   const Float_t kMinPointAngle2 = 0.99;\r
 178   const Float_t kMinR           = 0.5;\r
 179   const Float_t kMaxR           = 220;\r
 180   //const Float_t kCausality0Cut   = 0.19;\r
 181   //const Float_t kLikelihood01Cut = 0.25;\r
 182   //const Float_t kPointAngleCut   = 0.9996;\r
 183   const Float_t kCausality0Cut   = 0.19;\r
 184   const Float_t kLikelihood01Cut = 0.45;\r
 185   const Float_t kLikelihood1Cut  = 0.5;\r
 186   const Float_t kCombinedCut     = 0.55;\r
 187 \r
 188   TObjArray *trackHypothesys = tracker->GetTrackHypothesys();\r
 189   TObjArray *bestHypothesys  = tracker->GetBestHypothesys();\r
 190   TObjArray *originalTracks  = tracker->GetOriginal();\r
 191   //\r
 192   //\r
 193   TTreeSRedirector &cstream = *(tracker->GetDebugStreamer());\r
 194   Int_t ntracks    = event->GetNumberOfTracks(); \r
 195   Int_t nitstracks = trackHypothesys->GetEntriesFast();\r
 196   originalTracks->Expand(ntracks);\r
 197   trackHypothesys->Expand(ntracks);\r
 198   bestHypothesys->Expand(ntracks);\r
 199   //\r
 200   AliHelix * helixes   = new AliHelix[ntracks+2];\r
 201   TObjArray trackarray(ntracks+2);     //array with tracks - with vertex constrain\r
 202   TObjArray trackarrayc(ntracks+2);    //array of "best    tracks" - without vertex constrain\r
 203   TObjArray trackarrayl(ntracks+2);    //array of "longest tracks" - without vertex constrain\r
 204   Bool_t * forbidden   = new Bool_t [ntracks+2];\r
 205   Int_t   *itsmap      = new Int_t  [ntracks+2];\r
 206   Float_t *dist        = new Float_t[ntracks+2];\r
 207   Float_t *normdist0   = new Float_t[ntracks+2];\r
 208   Float_t *normdist1   = new Float_t[ntracks+2];\r
 209   Float_t *normdist    = new Float_t[ntracks+2];\r
 210   Float_t *norm        = new Float_t[ntracks+2];\r
 211   Float_t *maxr        = new Float_t[ntracks+2];\r
 212   Float_t *minr        = new Float_t[ntracks+2];\r
 213   Float_t *minPointAngle= new Float_t[ntracks+2];\r
 214   //\r
 215   AliV0 *pvertex      = new AliV0;\r
 216   AliITStrackMI * dummy= new AliITStrackMI;\r
 217   dummy->SetLabel(0);\r
 218   AliITStrackMI  trackat0;    //temporary track for DCA calculation\r
 219   //\r
 220   Float_t primvertex[3]={tracker->GetX(),tracker->GetY(),tracker->GetZ()};\r
 221   //\r
 222   // make ITS -  ESD map\r
 223   //\r
 224   for (Int_t itrack=0;itrack<ntracks+2;itrack++) {\r
 225     itsmap[itrack]        = -1;\r
 226     forbidden[itrack]     = kFALSE;\r
 227     maxr[itrack]          = kMaxR;\r
 228     minr[itrack]          = kMinR;\r
 229     minPointAngle[itrack] = kMinPointAngle;\r
 230   }\r
 231   for (Int_t itrack=0;itrack<nitstracks;itrack++){\r
 232     AliITStrackMI * original =   (AliITStrackMI*)(originalTracks->At(itrack));\r
 233     Int_t           esdindex =   original->GetESDtrack()->GetID();\r
 234     itsmap[esdindex]         =   itrack;\r
 235   }\r
 236   //\r
 237   // create ITS tracks from ESD tracks if not done before\r
 238   //\r
 239   for (Int_t itrack=0;itrack<ntracks;itrack++){\r
 240     if (itsmap[itrack]>=0) continue;\r
 241     AliITStrackMI * tpctrack = new AliITStrackMI(*(event->GetTrack(itrack)));\r
 242     //tpctrack->fD[0] = tpctrack->GetD(GetX(),GetY());\r
 243     //tpctrack->fD[1] = tpctrack->GetZat(GetX())-GetZ(); \r
 244     tpctrack->GetDZ(tracker->GetX(),tracker->GetY(),tracker->GetZ(),tpctrack->GetDP());   //I.B.\r
 245     if (tpctrack->GetD(0)<20 && tpctrack->GetD(1)<20){\r
 246       // tracks which can reach inner part of ITS\r
 247       // propagate track to outer its volume - with correction for material\r
 248       AliITStrackerMI::CorrectForTPCtoITSDeadZoneMaterial(tpctrack);  \r
 249     }\r
 250     itsmap[itrack] = nitstracks;\r
 251     originalTracks->AddAt(tpctrack,nitstracks);\r
 252     nitstracks++;\r
 253   }\r
 254   //\r
 255   // fill temporary arrays\r
 256   //\r
 257   for (Int_t itrack=0;itrack<ntracks;itrack++){\r
 258     AliESDtrack *  esdtrack = event->GetTrack(itrack);\r
 259     Int_t          itsindex = itsmap[itrack];\r
 260     AliITStrackMI *original = (AliITStrackMI*)originalTracks->At(itsmap[itrack]);\r
 261     if (!original) continue;\r
 262     AliITStrackMI *bestConst  = 0;\r
 263     AliITStrackMI *bestLong   = 0;\r
 264     AliITStrackMI *best       = 0;    \r
 265     //\r
 266     //\r
 267     TObjArray * array    = (TObjArray*)  trackHypothesys->At(itsindex);\r
 268     Int_t       hentries = (array==0) ?  0 : array->GetEntriesFast();\r
 269     // Get best track with vertex constrain\r
 270     for (Int_t ih=0;ih<hentries;ih++){\r
 271       AliITStrackMI * trackh = (AliITStrackMI*)array->At(ih);\r
 272       if (!trackh->GetConstrain()) continue;\r
 273       if (!bestConst) bestConst = trackh;\r
 274       if (trackh->GetNumberOfClusters()>5.0){\r
 275         bestConst  = trackh;                         // full track -  with minimal chi2\r
 276         break;\r
 277       }\r
 278       if (trackh->GetNumberOfClusters()+trackh->GetNDeadZone()<=bestConst->GetNumberOfClusters()+bestConst->GetNDeadZone())  continue;      \r
 279       bestConst = trackh;\r
 280       break;\r
 281     }\r
 282     // Get best long track without vertex constrain and best track without vertex constrain\r
 283     for (Int_t ih=0;ih<hentries;ih++){\r
 284       AliITStrackMI * trackh = (AliITStrackMI*)array->At(ih);\r
 285       if (trackh->GetConstrain()) continue;\r
 286       if (!best)     best     = trackh;\r
 287       if (!bestLong) bestLong = trackh;\r
 288       if (trackh->GetNumberOfClusters()>5.0){\r
 289         bestLong  = trackh;                         // full track -  with minimal chi2\r
 290         break;\r
 291       }\r
 292       if (trackh->GetNumberOfClusters()+trackh->GetNDeadZone()<=bestLong->GetNumberOfClusters()+bestLong->GetNDeadZone())  continue;      \r
 293       bestLong = trackh;        \r
 294     }\r
 295     if (!best) {\r
 296       best     = original;\r
 297       bestLong = original;\r
 298     }\r
 299     //I.B. trackat0 = *bestLong;\r
 300     new (&trackat0) AliITStrackMI(*bestLong);\r
 301     Double_t xx,yy,zz,alpha; \r
 302     if (!bestLong->GetGlobalXYZat(bestLong->GetX(),xx,yy,zz)) continue;\r
 303     alpha = TMath::ATan2(yy,xx);    \r
 304     //    if (!trackat0.Propagate(alpha,0)) continue;    \r
 305     trackat0.Propagate(alpha,0); //PH The check on the return value is temporarily disabled (bug 45751) \r
 306     // calculate normalized distances to the vertex \r
 307     //\r
 308     Float_t ptfac  = (1.+100.*TMath::Abs(trackat0.GetC()));\r
 309     if ( bestLong->GetNumberOfClusters()>3 ){      \r
 310       dist[itsindex]      = trackat0.GetY();\r
 311       norm[itsindex]      = ptfac*TMath::Sqrt(trackat0.GetSigmaY2());\r
 312       normdist0[itsindex] = TMath::Abs(trackat0.GetY()/norm[itsindex]);\r
 313       normdist1[itsindex] = TMath::Abs((trackat0.GetZ()-primvertex[2])/(ptfac*TMath::Sqrt(trackat0.GetSigmaZ2())));\r
 314       normdist[itsindex]  = TMath::Sqrt(normdist0[itsindex]*normdist0[itsindex]+normdist1[itsindex]*normdist1[itsindex]);\r
 315       if (!bestConst){\r
 316         if (bestLong->GetNumberOfClusters()+bestLong->GetNDeadZone()<6) normdist[itsindex]*=2.;\r
 317         if (bestLong->GetNumberOfClusters()+bestLong->GetNDeadZone()<5) normdist[itsindex]*=2.;\r
 318         if (bestLong->GetNumberOfClusters()+bestLong->GetNDeadZone()<4) normdist[itsindex]*=2.;\r
 319       }else{\r
 320         if (bestConst->GetNumberOfClusters()+bestConst->GetNDeadZone()<6) normdist[itsindex]*=1.5;\r
 321         if (bestConst->GetNumberOfClusters()+bestConst->GetNDeadZone()<5) normdist[itsindex]*=1.5;\r
 322       }\r
 323     }\r
 324     else{      \r
 325       if (bestConst&&bestConst->GetNumberOfClusters()+bestConst->GetNDeadZone()>4.5){\r
 326         dist[itsindex] = bestConst->GetD(0);\r
 327         norm[itsindex] = bestConst->GetDnorm(0);\r
 328         normdist0[itsindex] = TMath::Abs(bestConst->GetD(0)/norm[itsindex]);\r
 329         normdist1[itsindex] = TMath::Abs(bestConst->GetD(0)/norm[itsindex]);\r
 330         normdist[itsindex]  = TMath::Sqrt(normdist0[itsindex]*normdist0[itsindex]+normdist1[itsindex]*normdist1[itsindex]);\r
 331       }else{\r
 332         dist[itsindex]      = trackat0.GetY();\r
 333         norm[itsindex]      = ptfac*TMath::Sqrt(trackat0.GetSigmaY2());\r
 334         normdist0[itsindex] = TMath::Abs(trackat0.GetY()/norm[itsindex]);\r
 335         normdist1[itsindex] = TMath::Abs((trackat0.GetZ()-primvertex[2])/(ptfac*TMath::Sqrt(trackat0.GetSigmaZ2())));\r
 336         normdist[itsindex]  = TMath::Sqrt(normdist0[itsindex]*normdist0[itsindex]+normdist1[itsindex]*normdist1[itsindex]);\r
 337         if (TMath::Abs(trackat0.GetTgl())>1.05){\r
 338           if (normdist[itsindex]<3) forbidden[itsindex]=kTRUE;\r
 339           if (normdist[itsindex]>3) {\r
 340             minr[itsindex] = TMath::Max(Float_t(40.),minr[itsindex]);\r
 341           }\r
 342         }\r
 343       }\r
 344     }\r
 345     //\r
 346     //-----------------------------------------------------------\r
 347     //Forbid primary track candidates - \r
 348     //\r
 349     //treetr->SetAlias("forbidden0","Tr0.fN<4&&Tr1.fN+Tr1.fNDeadZone>4.5");\r
 350     //treetr->SetAlias("forbidden1","ND<3&&Tr1.fN+Tr1.fNDeadZone>5.5");\r
 351     //treetr->SetAlias("forbidden2","ND<2&&Tr1.fClIndex[0]>0&&Tr1.fClIndex[0]>0");\r
 352     //treetr->SetAlias("forbidden3","ND<1&&Tr1.fClIndex[0]>0");\r
 353     //treetr->SetAlias("forbidden4","ND<4&&Tr1.fNormChi2[0]<2");\r
 354     //treetr->SetAlias("forbidden5","ND<5&&Tr1.fNormChi2[0]<1");\r
 355     //-----------------------------------------------------------\r
 356     if (bestConst){\r
 357       if (bestLong->GetNumberOfClusters()<4       && bestConst->GetNumberOfClusters()+bestConst->GetNDeadZone()>4.5)               forbidden[itsindex]=kTRUE;\r
 358       if (normdist[itsindex]<3 && bestConst->GetNumberOfClusters()+bestConst->GetNDeadZone()>5.5)               forbidden[itsindex]=kTRUE;\r
 359       if (normdist[itsindex]<2 && bestConst->GetClIndex(0)>=0 && bestConst->GetClIndex(1)>=0 ) forbidden[itsindex]=kTRUE;\r
 360       if (normdist[itsindex]<1 && bestConst->GetClIndex(0)>=0)                              forbidden[itsindex]=kTRUE;\r
 361       if (normdist[itsindex]<4 && bestConst->GetNormChi2(0)<2)                             forbidden[itsindex]=kTRUE;\r
 362       if (normdist[itsindex]<5 && bestConst->GetNormChi2(0)<1)                             forbidden[itsindex]=kTRUE;      \r
 363       if (bestConst->GetNormChi2(0)<2.5) {\r
 364         minPointAngle[itsindex]= 0.9999;\r
 365         maxr[itsindex]         = 10;\r
 366       }\r
 367     }\r
 368     //\r
 369     //forbid daughter kink candidates\r
 370     //\r
 371     if (esdtrack->GetKinkIndex(0)>0) forbidden[itsindex] = kTRUE;\r
 372     Bool_t isElectron = kTRUE;\r
 373     Bool_t isProton   = kTRUE;\r
 374     Double_t pid[5];\r
 375     esdtrack->GetESDpid(pid);\r
 376     for (Int_t i=1;i<5;i++){\r
 377       if (pid[0]<pid[i]) isElectron= kFALSE;\r
 378       if (pid[4]<pid[i]) isProton= kFALSE;\r
 379     }\r
 380     if (isElectron){\r
 381       forbidden[itsindex]=kFALSE;       \r
 382       normdist[itsindex]*=-1;\r
 383     }\r
 384     if (isProton){\r
 385       if (normdist[itsindex]>2) forbidden[itsindex]=kFALSE;     \r
 386       normdist[itsindex]*=-1;\r
 387     }\r
 388 \r
 389     //\r
 390     // Causality cuts in TPC volume\r
 391     //\r
 392     if (esdtrack->GetTPCdensity(0,10) >0.6)  maxr[itsindex] = TMath::Min(Float_t(110),maxr[itsindex]);\r
 393     if (esdtrack->GetTPCdensity(10,30)>0.6)  maxr[itsindex] = TMath::Min(Float_t(120),maxr[itsindex]);\r
 394     if (esdtrack->GetTPCdensity(20,40)>0.6)  maxr[itsindex] = TMath::Min(Float_t(130),maxr[itsindex]);\r
 395     if (esdtrack->GetTPCdensity(30,50)>0.6)  maxr[itsindex] = TMath::Min(Float_t(140),maxr[itsindex]);\r
 396     //\r
 397     if (esdtrack->GetTPCdensity(0,60)<0.4&&bestLong->GetNumberOfClusters()<3) minr[itsindex]=100;    \r
 398     //\r
 399     //\r
 400     if (kFALSE){\r
 401       cstream<<"Track"<<\r
 402         "Tr0.="<<best<<\r
 403         "Tr1.="<<((bestConst)? bestConst:dummy)<<\r
 404         "Tr2.="<<bestLong<<\r
 405         "Tr3.="<<&trackat0<<\r
 406         "Esd.="<<esdtrack<<\r
 407         "Dist="<<dist[itsindex]<<\r
 408         "ND0="<<normdist0[itsindex]<<\r
 409         "ND1="<<normdist1[itsindex]<<\r
 410         "ND="<<normdist[itsindex]<<\r
 411         "Pz="<<primvertex[2]<<\r
 412         "Forbid="<<forbidden[itsindex]<<\r
 413         "\n";\r
 414       //\r
 415     }\r
 416     trackarray.AddAt(best,itsindex);\r
 417     trackarrayc.AddAt(bestConst,itsindex);\r
 418     trackarrayl.AddAt(bestLong,itsindex);\r
 419     new (&helixes[itsindex]) AliHelix(*best);\r
 420   }\r
 421   //\r
 422   //\r
 423   //\r
 424   // first iterration of V0 finder\r
 425   //\r
 426   for (Int_t iesd0=0;iesd0<ntracks;iesd0++){\r
 427     Int_t itrack0 = itsmap[iesd0];\r
 428     if (forbidden[itrack0]) continue;\r
 429     AliITStrackMI * btrack0 = (AliITStrackMI*)trackarray.At(itrack0);\r
 430     if (!btrack0) continue;    \r
 431     if (btrack0->GetSign()>0 && !AliITSReconstructor::GetRecoParam()->GetStoreLikeSignV0s()) continue;\r
 432     AliITStrackMI *trackc0 = (AliITStrackMI*)trackarrayc.At(itrack0);\r
 433     //\r
 434     for (Int_t iesd1=iesd0+1;iesd1<ntracks;iesd1++){\r
 435       Int_t itrack1 = itsmap[iesd1];\r
 436       if (forbidden[itrack1]) continue;\r
 437 \r
 438       AliITStrackMI * btrack1 = (AliITStrackMI*)trackarray.At(itrack1); \r
 439       if (!btrack1) continue;\r
 440       if (btrack1->GetSign()<0 && !AliITSReconstructor::GetRecoParam()->GetStoreLikeSignV0s()) continue;\r
 441       Bool_t isGold = kFALSE;\r
 442       if (TMath::Abs(TMath::Abs(btrack0->GetLabel())-TMath::Abs(btrack1->GetLabel()))==1){\r
 443         isGold = kTRUE;\r
 444       }\r
 445       AliITStrackMI *trackc1 = (AliITStrackMI*)trackarrayc.At(itrack1);\r
 446       AliHelix &h1 = helixes[itrack0];\r
 447       AliHelix &h2 = helixes[itrack1];\r
 448       //\r
 449       // find linear distance\r
 450       Double_t rmin =0;\r
 451       //\r
 452       //\r
 453       //\r
 454       Double_t phase[2][2],radius[2];\r
 455       Int_t  points = h1.GetRPHIintersections(h2, phase, radius);\r
 456       if    (points==0)  continue;\r
 457       Double_t delta[2]={1000000,1000000};        \r
 458       rmin = radius[0];\r
 459       h1.ParabolicDCA(h2,phase[0][0],phase[0][1],radius[0],delta[0]);\r
 460       if (points==2){    \r
 461         if (radius[1]<rmin) rmin = radius[1];\r
 462         h1.ParabolicDCA(h2,phase[1][0],phase[1][1],radius[1],delta[1]);\r
 463       }\r
 464       rmin = TMath::Sqrt(rmin);\r
 465       Double_t distance = 0;\r
 466       Double_t radiusC  = 0;\r
 467       Int_t    iphase   = 0;\r
 468       if (points==1 || delta[0]<delta[1]){\r
 469         distance = TMath::Sqrt(delta[0]);\r
 470         radiusC  = TMath::Sqrt(radius[0]);\r
 471       }else{\r
 472         distance = TMath::Sqrt(delta[1]);\r
 473         radiusC  = TMath::Sqrt(radius[1]);\r
 474         iphase=1;\r
 475       }\r
 476       if (radiusC<TMath::Max(minr[itrack0],minr[itrack1]))    continue;\r
 477       if (radiusC>TMath::Min(maxr[itrack0],maxr[itrack1]))     continue; \r
 478       Float_t maxDist  = TMath::Min(kMaxDist,Float_t(kMaxDist0+radiusC*kMaxDist1));      \r
 479       if (distance>maxDist) continue;\r
 480       Float_t pointAngle = h1.GetPointAngle(h2,phase[iphase],primvertex);\r
 481       if (pointAngle<TMath::Max(minPointAngle[itrack0],minPointAngle[itrack1])) continue;\r
 482       //\r
 483       //\r
 484       //      Double_t distance = TestV0(h1,h2,pvertex,rmin);\r
 485       //\r
 486       //       if (distance>maxDist)           continue;\r
 487       //       if (pvertex->GetRr()<kMinR)     continue;\r
 488       //       if (pvertex->GetRr()>kMaxR)     continue;\r
 489       AliITStrackMI * track0=btrack0;\r
 490       AliITStrackMI * track1=btrack1;\r
 491       //      if (pvertex->GetRr()<3.5){  \r
 492       if (radiusC<3.5){  \r
 493         //use longest tracks inside the pipe\r
 494         track0 = (AliITStrackMI*)trackarrayl.At(itrack0);\r
 495         track1 = (AliITStrackMI*)trackarrayl.At(itrack1);\r
 496       }      \r
 497       //\r
 498       //\r
 499       pvertex->SetParamN(*track0);\r
 500       pvertex->SetParamP(*track1);\r
 501       pvertex->Update(primvertex);\r
 502       pvertex->SetClusters(track0->ClIndex(),track1->ClIndex());  // register clusters\r
 503 \r
 504       if (pvertex->GetRr()<kMinR) continue;\r
 505       if (pvertex->GetRr()>kMaxR) continue;\r
 506       if (pvertex->GetV0CosineOfPointingAngle()<kMinPointAngle) continue;\r
 507 //Bo:      if (pvertex->GetDist2()>maxDist) continue;\r
 508       if (pvertex->GetDcaV0Daughters()>maxDist) continue;\r
 509 //Bo:        pvertex->SetLab(0,track0->GetLabel());\r
 510 //Bo:        pvertex->SetLab(1,track1->GetLabel());\r
 511       pvertex->SetIndex(0,track0->GetESDtrack()->GetID());\r
 512       pvertex->SetIndex(1,track1->GetESDtrack()->GetID());\r
 513       //      \r
 514       AliITStrackMI * htrackc0 = trackc0 ? trackc0:dummy;      \r
 515       AliITStrackMI * htrackc1 = trackc1 ? trackc1:dummy;\r
 516 \r
 517       //\r
 518       //\r
 519       TObjArray * array0b     = (TObjArray*)bestHypothesys->At(itrack0);\r
 520       if (!array0b&&pvertex->GetRr()<40 && TMath::Abs(track0->GetTgl())<1.1) {\r
 521         tracker->SetCurrentEsdTrack(itrack0);\r
 522         tracker->FollowProlongationTree((AliITStrackMI*)originalTracks->At(itrack0),itrack0, kFALSE);\r
 523       }\r
 524       TObjArray * array1b    = (TObjArray*)bestHypothesys->At(itrack1);\r
 525       if (!array1b&&pvertex->GetRr()<40 && TMath::Abs(track1->GetTgl())<1.1) { \r
 526         tracker->SetCurrentEsdTrack(itrack1);\r
 527         tracker->FollowProlongationTree((AliITStrackMI*)originalTracks->At(itrack1),itrack1, kFALSE);\r
 528       }\r
 529       //\r
 530       AliITStrackMI * track0b = (AliITStrackMI*)originalTracks->At(itrack0);\r
 531       AliITStrackMI * track1b = (AliITStrackMI*)originalTracks->At(itrack1);\r
 532       AliITStrackMI * track0l = (AliITStrackMI*)originalTracks->At(itrack0);\r
 533       AliITStrackMI * track1l = (AliITStrackMI*)originalTracks->At(itrack1);\r
 534       \r
 535       Float_t minchi2before0=16;\r
 536       Float_t minchi2before1=16;\r
 537       Float_t minchi2after0 =16;\r
 538       Float_t minchi2after1 =16;\r
 539       Double_t xrp[3]; pvertex->GetXYZ(xrp[0],xrp[1],xrp[2]);  //I.B.\r
 540       Int_t maxLayer = tracker->GetNearestLayer(xrp);                   //I.B.\r
 541       \r
 542       if (array0b) for (Int_t i=0;i<5;i++){\r
 543         // best track after vertex\r
 544         AliITStrackMI * btrack = (AliITStrackMI*)array0b->At(i);\r
 545         if (!btrack) continue;\r
 546         if (btrack->GetNumberOfClusters()>track0l->GetNumberOfClusters()) track0l = btrack;     \r
 547         //      if (btrack->fX<pvertex->GetRr()-2.-0.5/(0.1+pvertex->GetAnglep()[2])) {\r
 548         if (btrack->GetX()<pvertex->GetRr()-2.) {\r
 549           if ( (maxLayer>i+2|| (i==0)) && btrack->GetNumberOfClusters()==(6-i)&&i<3){\r
 550             Float_t sumchi2= 0;\r
 551             Float_t sumn   = 0;\r
 552             if (maxLayer<3){   // take prim vertex as additional measurement\r
 553               if (normdist[itrack0]>0 && htrackc0){\r
 554                 sumchi2 += TMath::Min((3.-maxLayer)*normdist[itrack0]*normdist[itrack0],16.);\r
 555               }else{\r
 556                 sumchi2 +=  TMath::Min((3.-maxLayer)*(3*normdist[itrack0]*normdist[itrack0]+3.),16.);\r
 557               }\r
 558               sumn    +=  3-maxLayer;\r
 559             }\r
 560             for (Int_t ilayer=i;ilayer<maxLayer;ilayer++){\r
 561               sumn+=1.;       \r
 562               if (btrack->GetClIndex(ilayer)<0){\r
 563                 sumchi2+=25;\r
 564                 continue;\r
 565               }else{\r
 566                 Int_t c=( btrack->GetClIndex(ilayer) & 0x0fffffff);\r
 567                 for (Int_t itrack=0;itrack<4;itrack++){\r
 568                   AliITStrackerMI::AliITSlayer &layer=tracker->GetLayer(ilayer);\r
 569                   if (layer.GetClusterTracks(itrack,c)>=0 && layer.GetClusterTracks(itrack,c)!=itrack0){\r
 570                     sumchi2+=18.;  //shared cluster\r
 571                     break;\r
 572                   }\r
 573                 }\r
 574                 sumchi2+=btrack->GetDy(ilayer)*btrack->GetDy(ilayer)/(btrack->GetSigmaY(ilayer)*btrack->GetSigmaY(ilayer));\r
 575                 sumchi2+=btrack->GetDz(ilayer)*btrack->GetDz(ilayer)/(btrack->GetSigmaZ(ilayer)*btrack->GetSigmaZ(ilayer));            \r
 576               }\r
 577             }\r
 578             sumchi2/=sumn;\r
 579             if (sumchi2<minchi2before0) minchi2before0=sumchi2; \r
 580           }\r
 581           continue;   //safety space - Geo manager will give exact layer\r
 582         }\r
 583         track0b       = btrack;\r
 584         minchi2after0 = btrack->GetNormChi2(i);\r
 585         break;\r
 586       }\r
 587       if (array1b) for (Int_t i=0;i<5;i++){\r
 588         // best track after vertex\r
 589         AliITStrackMI * btrack = (AliITStrackMI*)array1b->At(i);\r
 590         if (!btrack) continue;\r
 591         if (btrack->GetNumberOfClusters()>track1l->GetNumberOfClusters()) track1l = btrack;     \r
 592         //      if (btrack->fX<pvertex->GetRr()-2-0.5/(0.1+pvertex->GetAnglep()[2])){\r
 593         if (btrack->GetX()<pvertex->GetRr()-2){\r
 594           if ((maxLayer>i+2 || (i==0))&&btrack->GetNumberOfClusters()==(6-i)&&(i<3)){\r
 595             Float_t sumchi2= 0;\r
 596             Float_t sumn   = 0;\r
 597             if (maxLayer<3){   // take prim vertex as additional measurement\r
 598               if (normdist[itrack1]>0 && htrackc1){\r
 599                 sumchi2 +=  TMath::Min((3.-maxLayer)*normdist[itrack1]*normdist[itrack1],16.);\r
 600               }else{\r
 601                 sumchi2 += TMath::Min((3.-maxLayer)*(3*normdist[itrack1]*normdist[itrack1]+3.),16.);\r
 602               }\r
 603               sumn    +=  3-maxLayer;\r
 604             }\r
 605             for (Int_t ilayer=i;ilayer<maxLayer;ilayer++){\r
 606               sumn+=1.;\r
 607               if (btrack->GetClIndex(ilayer)<0){\r
 608                 sumchi2+=30;\r
 609                 continue;\r
 610               }else{\r
 611                 Int_t c=( btrack->GetClIndex(ilayer) & 0x0fffffff);\r
 612                 for (Int_t itrack=0;itrack<4;itrack++){\r
 613                   AliITStrackerMI::AliITSlayer &layer=tracker->GetLayer(ilayer);\r
 614                   if (layer.GetClusterTracks(itrack,c)>=0 && layer.GetClusterTracks(itrack,c)!=itrack1){\r
 615                     sumchi2+=18.;  //shared cluster\r
 616                     break;\r
 617                   }\r
 618                 }\r
 619                 sumchi2+=btrack->GetDy(ilayer)*btrack->GetDy(ilayer)/(btrack->GetSigmaY(ilayer)*btrack->GetSigmaY(ilayer));\r
 620                 sumchi2+=btrack->GetDz(ilayer)*btrack->GetDz(ilayer)/(btrack->GetSigmaZ(ilayer)*btrack->GetSigmaZ(ilayer));            \r
 621               }\r
 622             }\r
 623             sumchi2/=sumn;\r
 624             if (sumchi2<minchi2before1) minchi2before1=sumchi2; \r
 625           }\r
 626           continue;   //safety space - Geo manager will give exact layer           \r
 627         }\r
 628         track1b = btrack;\r
 629         minchi2after1 = btrack->GetNormChi2(i);\r
 630         break;\r
 631       }\r
 632       //\r
 633       // position resolution - used for DCA cut\r
 634       Float_t sigmad = track0b->GetSigmaY2()+track0b->GetSigmaZ2()+track1b->GetSigmaY2()+track1b->GetSigmaZ2()+\r
 635         (track0b->GetX()-pvertex->GetRr())*(track0b->GetX()-pvertex->GetRr())*(track0b->GetSigmaSnp2()+track0b->GetSigmaTgl2())+\r
 636         (track1b->GetX()-pvertex->GetRr())*(track1b->GetX()-pvertex->GetRr())*(track1b->GetSigmaSnp2()+track1b->GetSigmaTgl2());\r
 637       sigmad =TMath::Sqrt(sigmad)+0.04;\r
 638       if (pvertex->GetRr()>50){\r
 639         Double_t cov0[15],cov1[15];\r
 640         track0b->GetESDtrack()->GetInnerExternalCovariance(cov0);\r
 641         track1b->GetESDtrack()->GetInnerExternalCovariance(cov1);\r
 642         sigmad = cov0[0]+cov0[2]+cov1[0]+cov1[2]+\r
 643           (80.-pvertex->GetRr())*(80.-pvertex->GetRr())*(cov0[5]+cov0[9])+\r
 644           (80.-pvertex->GetRr())*(80.-pvertex->GetRr())*(cov1[5]+cov1[9]);\r
 645         sigmad =TMath::Sqrt(sigmad)+0.05;\r
 646       }\r
 647       //       \r
 648       AliV0 vertex2;\r
 649       vertex2.SetParamN(*track0b);\r
 650       vertex2.SetParamP(*track1b);\r
 651       vertex2.Update(primvertex);\r
 652       //Bo:      if (vertex2.GetDist2()<=pvertex->GetDist2()&&(vertex2.GetV0CosineOfPointingAngle()>=pvertex->GetV0CosineOfPointingAngle())){\r
 653       if (vertex2.GetDcaV0Daughters()<=pvertex->GetDcaV0Daughters()&&(vertex2.GetV0CosineOfPointingAngle()>=pvertex->GetV0CosineOfPointingAngle())){\r
 654         pvertex->SetParamN(*track0b);\r
 655         pvertex->SetParamP(*track1b);\r
 656         pvertex->Update(primvertex);\r
 657         pvertex->SetClusters(track0b->ClIndex(),track1b->ClIndex());  // register clusters\r
 658         pvertex->SetIndex(0,track0->GetESDtrack()->GetID());\r
 659         pvertex->SetIndex(1,track1->GetESDtrack()->GetID());\r
 660       }\r
 661       pvertex->SetDistSigma(sigmad);\r
 662       //Bo:      pvertex->SetDistNorm(pvertex->GetDist2()/sigmad);       \r
 663       pvertex->SetNormDCAPrim(normdist[itrack0],normdist[itrack1]);\r
 664       //\r
 665       // define likelihhod and causalities\r
 666       //\r
 667       Float_t pa0=1, pa1=1, pb0=0.26, pb1=0.26;      \r
 668       if (maxLayer<1){\r
 669         Float_t fnorm0 = normdist[itrack0];\r
 670         if (fnorm0<0) fnorm0*=-3;\r
 671         Float_t fnorm1 = normdist[itrack1];\r
 672         if (fnorm1<0) fnorm1*=-3;\r
 673         if ((pvertex->GetAnglep()[2]>0.1) || ( (pvertex->GetRr()<10.5)&& pvertex->GetAnglep()[2]>0.05 ) || (pvertex->GetRr()<3)){\r
 674           pb0    =  TMath::Exp(-TMath::Min(fnorm0,Float_t(16.))/12.);\r
 675           pb1    =  TMath::Exp(-TMath::Min(fnorm1,Float_t(16.))/12.);\r
 676         }\r
 677         pvertex->SetChi2Before(normdist[itrack0]);\r
 678         pvertex->SetChi2After(normdist[itrack1]);       \r
 679         pvertex->SetNAfter(0);\r
 680         pvertex->SetNBefore(0);\r
 681       }else{\r
 682         pvertex->SetChi2Before(minchi2before0);\r
 683         pvertex->SetChi2After(minchi2before1);\r
 684          if (pvertex->GetAnglep()[2]>0.1 || ( pvertex->GetRr()<10.5 && pvertex->GetAnglep()[2]>0.05) || pvertex->GetRr()<3){\r
 685            pb0    =  TMath::Exp(-TMath::Min(minchi2before0,Float_t(16))/12.);\r
 686            pb1    =  TMath::Exp(-TMath::Min(minchi2before1,Float_t(16))/12.);\r
 687          }\r
 688          pvertex->SetNAfter(maxLayer);\r
 689          pvertex->SetNBefore(maxLayer);      \r
 690       }\r
 691       if (pvertex->GetRr()<90){\r
 692         pa0  *= TMath::Min(track0->GetESDtrack()->GetTPCdensity(0,60),Double_t(1.));\r
 693         pa1  *= TMath::Min(track1->GetESDtrack()->GetTPCdensity(0,60),Double_t(1.));\r
 694       }\r
 695       if (pvertex->GetRr()<20){\r
 696         pa0  *= (0.2+TMath::Exp(-TMath::Min(minchi2after0,Float_t(16))/8.))/1.2;\r
 697         pa1  *= (0.2+TMath::Exp(-TMath::Min(minchi2after1,Float_t(16))/8.))/1.2;\r
 698       }\r
 699       //\r
 700       pvertex->SetCausality(pb0,pb1,pa0,pa1);\r
 701       //\r
 702       //  Likelihood calculations  - apply cuts\r
 703       //         \r
 704       Bool_t v0OK = kTRUE;\r
 705       Float_t p12 = pvertex->GetParamP()->GetParameter()[4]*pvertex->GetParamP()->GetParameter()[4];\r
 706       p12        += pvertex->GetParamN()->GetParameter()[4]*pvertex->GetParamN()->GetParameter()[4];\r
 707       p12         = TMath::Sqrt(p12);                             // "mean" momenta\r
 708       Float_t    sigmap0   = 0.0001+0.001/(0.1+pvertex->GetRr()); \r
 709       Float_t    sigmap    = 0.5*sigmap0*(0.6+0.4*p12);           // "resolution: of point angle - as a function of radius and momenta\r
 710 \r
 711       Float_t causalityA  = (1.0-pvertex->GetCausalityP()[0])*(1.0-pvertex->GetCausalityP()[1]);\r
 712       Float_t causalityB  = TMath::Sqrt(TMath::Min(pvertex->GetCausalityP()[2],Double_t(0.7))*\r
 713                                         TMath::Min(pvertex->GetCausalityP()[3],Double_t(0.7)));\r
 714       //\r
 715       //Bo:      Float_t likelihood0 = (TMath::Exp(-pvertex->GetDistNorm())+0.1) *(pvertex->GetDist2()<0.5)*(pvertex->GetDistNorm()<5);\r
 716       Float_t lDistNorm = pvertex->GetDcaV0Daughters()/pvertex->GetDistSigma();\r
 717       Float_t likelihood0 = (TMath::Exp(-lDistNorm)+0.1) *(pvertex->GetDcaV0Daughters()<0.5)*(lDistNorm<5);\r
 718 \r
 719       Float_t likelihood1 = TMath::Exp(-(1.0001-pvertex->GetV0CosineOfPointingAngle())/sigmap)+\r
 720         0.4*TMath::Exp(-(1.0001-pvertex->GetV0CosineOfPointingAngle())/(4.*sigmap))+\r
 721         0.4*TMath::Exp(-(1.0001-pvertex->GetV0CosineOfPointingAngle())/(8.*sigmap))+\r
 722         0.1*TMath::Exp(-(1.0001-pvertex->GetV0CosineOfPointingAngle())/0.01);\r
 723       //\r
 724       if (causalityA<kCausality0Cut)                                          v0OK = kFALSE;\r
 725       if (TMath::Sqrt(likelihood0*likelihood1)<kLikelihood01Cut)              v0OK = kFALSE;\r
 726       if (likelihood1<kLikelihood1Cut)                                        v0OK = kFALSE;\r
 727       if (TMath::Power(likelihood0*likelihood1*causalityB,0.33)<kCombinedCut) v0OK = kFALSE;\r
 728       \r
 729       //\r
 730       //\r
 731       if (kFALSE){      \r
 732         Bool_t gold = TMath::Abs(TMath::Abs(track0->GetLabel())-TMath::Abs(track1->GetLabel()))==1;\r
 733         cstream<<"It0"<<\r
 734           "Tr0.="<<track0<<                       //best without constrain\r
 735           "Tr1.="<<track1<<                       //best without constrain  \r
 736           "Tr0B.="<<track0b<<                     //best without constrain  after vertex\r
 737           "Tr1B.="<<track1b<<                     //best without constrain  after vertex \r
 738           "Tr0C.="<<htrackc0<<                    //best with constrain     if exist\r
 739           "Tr1C.="<<htrackc1<<                    //best with constrain     if exist\r
 740           "Tr0L.="<<track0l<<                     //longest best           \r
 741           "Tr1L.="<<track1l<<                     //longest best\r
 742           "Esd0.="<<track0->GetESDtrack()<<           // esd track0 params\r
 743           "Esd1.="<<track1->GetESDtrack()<<           // esd track1 params\r
 744           "V0.="<<pvertex<<                       //vertex properties\r
 745           "V0b.="<<&vertex2<<                       //vertex properties at "best" track\r
 746           "ND0="<<normdist[itrack0]<<             //normalize distance for track0\r
 747           "ND1="<<normdist[itrack1]<<             //normalize distance for track1\r
 748           "Gold="<<gold<<                         //\r
 749           //      "RejectBase="<<rejectBase<<             //rejection in First itteration\r
 750           "OK="<<v0OK<<\r
 751           "rmin="<<rmin<<\r
 752           "sigmad="<<sigmad<<\r
 753           "\n";\r
 754       }      \r
 755       //if (rejectBase) continue;\r
 756       //\r
 757       pvertex->SetStatus(0);\r
 758       //      if (rejectBase) {\r
 759       //        pvertex->SetStatus(-100);\r
 760       //}\r
 761       if (pvertex->GetV0CosineOfPointingAngle()>kMinPointAngle2) {\r
 762         //Bo:     pvertex->SetESDindexes(track0->GetESDtrack()->GetID(),track1->GetESDtrack()->GetID());\r
 763         pvertex->SetIndex(0,track0->GetESDtrack()->GetID());//Bo: consistency 0 for neg\r
 764         pvertex->SetIndex(1,track1->GetESDtrack()->GetID());//Bo: consistency 1 for pos\r
 765         if (v0OK){\r
 766           //      AliV0vertex vertexjuri(*track0,*track1);\r
 767           //      vertexjuri.SetESDindexes(track0->fESDtrack->GetID(),track1->fESDtrack->GetID());\r
 768           //      event->AddV0(&vertexjuri);\r
 769           pvertex->SetStatus(100);\r
 770         }\r
 771         pvertex->SetOnFlyStatus(kTRUE);\r
 772         pvertex->ChangeMassHypothesis(kK0Short);\r
 773         event->AddV0(pvertex);\r
 774       }\r
 775     }\r
 776   }\r
 777   //\r
 778   //\r
 779   // delete temporary arrays\r
 780   //  \r
 781   delete[] forbidden;\r
 782   delete[] minPointAngle;\r
 783   delete[] maxr;\r
 784   delete[] minr;\r
 785   delete[] norm;\r
 786   delete[] normdist;\r
 787   delete[] normdist1;\r
 788   delete[] normdist0;\r
 789   delete[] dist;\r
 790   delete[] itsmap;\r
 791   delete[] helixes;\r
 792   delete   pvertex;\r
 793 }\r
 794 //------------------------------------------------------------------------\r
 795 void AliITSV0Finder::RefitV02(const AliESDEvent *event,\r
 796                                 AliITStrackerMI *tracker) \r
 797 {\r
 798   //\r
 799   //try to refit  V0s in the third path of the reconstruction\r
 800   //\r
 801   TTreeSRedirector &cstream = *(tracker->GetDebugStreamer());\r
 802   //\r
 803   Int_t  nv0s = event->GetNumberOfV0s();\r
 804   Float_t primvertex[3]={tracker->GetX(),tracker->GetY(),tracker->GetZ()};\r
 805   AliV0 v0temp;\r
 806   for (Int_t iv0 = 0; iv0<nv0s;iv0++){\r
 807     AliV0 * v0mi = (AliV0*)event->GetV0(iv0);\r
 808     if (!v0mi) continue;\r
 809     Int_t     itrack0   = v0mi->GetIndex(0);\r
 810     Int_t     itrack1   = v0mi->GetIndex(1);\r
 811     AliESDtrack *esd0   = event->GetTrack(itrack0);\r
 812     AliESDtrack *esd1   = event->GetTrack(itrack1);\r
 813     if (!esd0||!esd1) continue;\r
 814     AliITStrackMI tpc0(*esd0);  \r
 815     AliITStrackMI tpc1(*esd1);\r
 816     Double_t x,y,z; v0mi->GetXYZ(x,y,z); //I.B. \r
 817     Double_t alpha =TMath::ATan2(y,x);   //I.B.\r
 818     if (v0mi->GetRr()>85){\r
 819       if (tpc0.Propagate(alpha,v0mi->GetRr())&&tpc1.Propagate(alpha,v0mi->GetRr())){\r
 820         v0temp.SetParamN(tpc0);\r
 821         v0temp.SetParamP(tpc1);\r
 822         v0temp.Update(primvertex);\r
 823         if (kFALSE) cstream<<"Refit"<<\r
 824           "V0.="<<v0mi<<\r
 825           "V0refit.="<<&v0temp<<\r
 826           "Tr0.="<<&tpc0<<\r
 827           "Tr1.="<<&tpc1<<\r
 828           "\n";\r
 829         //Bo:   if (v0temp.GetDist2()<v0mi->GetDist2() || v0temp.GetV0CosineOfPointingAngle()>v0mi->GetV0CosineOfPointingAngle()){\r
 830         if (v0temp.GetDcaV0Daughters()<v0mi->GetDcaV0Daughters() || v0temp.GetV0CosineOfPointingAngle()>v0mi->GetV0CosineOfPointingAngle()){\r
 831           v0mi->SetParamN(tpc0);\r
 832           v0mi->SetParamP(tpc1);\r
 833           v0mi->Update(primvertex);\r
 834         }\r
 835       }\r
 836       continue;\r
 837     }\r
 838     if (v0mi->GetRr()>35){\r
 839       AliITStrackerMI::CorrectForTPCtoITSDeadZoneMaterial(&tpc0);\r
 840       AliITStrackerMI::CorrectForTPCtoITSDeadZoneMaterial(&tpc1);\r
 841       if (tpc0.Propagate(alpha,v0mi->GetRr())&&tpc1.Propagate(alpha,v0mi->GetRr())){\r
 842         v0temp.SetParamN(tpc0);\r
 843         v0temp.SetParamP(tpc1);\r
 844         v0temp.Update(primvertex);\r
 845         if (kFALSE) cstream<<"Refit"<<\r
 846           "V0.="<<v0mi<<\r
 847           "V0refit.="<<&v0temp<<\r
 848           "Tr0.="<<&tpc0<<\r
 849           "Tr1.="<<&tpc1<<\r
 850           "\n";\r
 851         //Bo:   if (v0temp.GetDist2()<v0mi->GetDist2() || v0temp.GetV0CosineOfPointingAngle()>v0mi->GetV0CosineOfPointingAngle()){\r
 852         if (v0temp.GetDcaV0Daughters()<v0mi->GetDcaV0Daughters() || v0temp.GetV0CosineOfPointingAngle()>v0mi->GetV0CosineOfPointingAngle()){\r
 853           v0mi->SetParamN(tpc0);\r
 854           v0mi->SetParamP(tpc1);\r
 855           v0mi->Update(primvertex);\r
 856         }       \r
 857       }\r
 858       continue;\r
 859     }\r
 860     AliITStrackerMI::CorrectForTPCtoITSDeadZoneMaterial(&tpc0);\r
 861     AliITStrackerMI::CorrectForTPCtoITSDeadZoneMaterial(&tpc1);    \r
 862     //    if (tpc0.Propagate(alpha,v0mi->GetRr())&&tpc1.Propagate(alpha,v0mi->GetRr())){\r
 863     if (tracker->RefitAt(v0mi->GetRr(),&tpc0, v0mi->GetClusters(0)) && \r
 864         tracker->RefitAt(v0mi->GetRr(),&tpc1, v0mi->GetClusters(1))){\r
 865       v0temp.SetParamN(tpc0);\r
 866       v0temp.SetParamP(tpc1);\r
 867       v0temp.Update(primvertex);\r
 868       if (kFALSE) cstream<<"Refit"<<\r
 869         "V0.="<<v0mi<<\r
 870         "V0refit.="<<&v0temp<<\r
 871         "Tr0.="<<&tpc0<<\r
 872         "Tr1.="<<&tpc1<<\r
 873         "\n";\r
 874       //Bo:      if (v0temp.GetDist2()<v0mi->GetDist2() || v0temp.GetV0CosineOfPointingAngle()>v0mi->GetV0CosineOfPointingAngle()){\r
 875       if (v0temp.GetDcaV0Daughters()<v0mi->GetDcaV0Daughters() || v0temp.GetV0CosineOfPointingAngle()>v0mi->GetV0CosineOfPointingAngle()){\r
 876         v0mi->SetParamN(tpc0);\r
 877         v0mi->SetParamP(tpc1);\r
 878         v0mi->Update(primvertex);\r
 879       } \r
 880     }    \r
 881   }\r
 882 }\r
 883 //------------------------------------------------------------------------\r