ITS/UPGRADE/v0/AliITStrackerUpgrade.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-2003, 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  **************************************************************************/
  15
  16 /* $Id$ */
  17
  18 ////////////////////////////////////////////////////
  19 //  ITS Upgrade Stand alone tracker class         //
  20 //  Authors: A.Mastroserio C.Terrevoli            //
  21 //  e-mail:annalisa.mastroserio@cern.ch           //
  22 //         cristina.terrevoli@ba.infn.it          //
  23 ////////////////////////////////////////////////////
  24
  25 #include <stdlib.h>
  26
  27 #include <TArrayI.h>
  28 #include <TBranch.h>
  29 #include <TObjArray.h>
  30 #include <TTree.h>
  31 #include "AliRunLoader.h"
  32 #include "AliITSLoader.h"
  33 #include "AliESDEvent.h"
  34 #include "AliESDVertex.h"
  35 #include "AliESDtrack.h"
  36 #include "AliITSVertexer.h"
  37 #include "AliITSclusterTable.h"
  38 #include "AliITSRecPointU.h"
  39 #include "AliITStrackU.h"
  40 #include "AliITStrackerMI.h"
  41 #include "AliITSlayerUpgrade.h"
  42 #include "AliITSsegmentationUpgrade.h"
  43 #include "AliITStrackerUpgrade.h"
  44 #include "AliITSReconstructor.h"
  45 #include "AliLog.h"
  46 #include "AliRun.h"
  47
  48 ClassImp(AliITStrackerUpgrade)
  49
  50 //____________________________________________________________________________
  51   AliITStrackerUpgrade::AliITStrackerUpgrade():
  52     AliITStrackerMI(),
  53     fNLayers(), fPhiEstimate(0), fITSStandAlone(0), fLambdac(0),
  54     fPhic(0), fCoef1(0), fCoef2(0), fCoef3(0), fNloop(0),
  55     fPhiWin(0),  fLambdaWin(0), fVert(0), fVertexer(0),
  56     fListOfTracks(0), fListOfUTracks(0), fITSclusters(0),
  57     fInwardFlag(0), fOuterStartLayer(0),  fInnerStartLayer(0),
  58     fMinNPoints(0),  fMinQ(0), fTrackToFollow(), fLayers(0), fSegmentation(0x0),
  59     fCluLayer(0), fCluCoord(0)
  60 {
  61   // Default constructor
  62   Init();
  63
  64 }
  65 //____________________________________________________________________________
  66 AliITStrackerUpgrade::AliITStrackerUpgrade(Int_t nLay):
  67   AliITStrackerMI(),
  68   fNLayers(nLay), fPhiEstimate(0), fITSStandAlone(0), fLambdac(0),
  69   fPhic(0), fCoef1(0), fCoef2(0), fCoef3(0), fNloop(0),
  70   fPhiWin(0),  fLambdaWin(0), fVert(0), fVertexer(0),
  71   fListOfTracks(0), fListOfUTracks(0), fITSclusters(0),
  72   fInwardFlag(0), fOuterStartLayer(0),  fInnerStartLayer(nLay),
  73   fMinNPoints(0),  fMinQ(0),  fTrackToFollow(), fLayers(0), fSegmentation(0x0),
  74   fCluLayer(0), fCluCoord(0)
  75 {
  76   //
  77   // constructor
  78   //
  79   Init();
  80
  81 }
  82 //____________________________________________________________________________
  83 AliITStrackerUpgrade::~AliITStrackerUpgrade(){
  84   // destructor
  85   // if fVertexer is not null, the AliESDVertex obj. is owned by this class
  86   // and is deleted here
  87   if(fVertexer){
  88     if(fVert)delete fVert;
  89   }
  90   fVert = 0;
  91   fVertexer = 0;
  92
  93   if(fPhiWin)delete []fPhiWin;
  94   if(fLambdaWin)delete []fLambdaWin;
  95   fListOfTracks->Delete();
  96   delete fListOfTracks;
  97   fListOfUTracks->Delete();
  98   delete fListOfUTracks;
  99   if(fCluLayer){
 100     for(Int_t i=0;i<fNLayers;i++){
 101       if(fCluLayer[i]){
 102         fCluLayer[i]->Delete();
 103         delete fCluLayer[i];
 104       }
 105     }
 106     delete [] fCluLayer;
 107   }
 108   if(fCluCoord){
 109     for(Int_t i=0;i<fNLayers;i++){
 110       if(fCluCoord[i]){
 111         fCluCoord[i]->Delete();
 112         delete fCluCoord[i];
 113       }
 114     }
 115     delete [] fCluCoord;
 116   }
 117
 118   if(fSegmentation) delete fSegmentation;
 119 }
 120
 121 //____________________________________________________________________________
 122 Int_t AliITStrackerUpgrade::Clusters2Tracks(AliESDEvent *event){
 123   // This method is used to find and fit the tracks. By default the corresponding
 124   // method in the parent class is invoked. In this way a combined tracking
 125   // TPC+ITS is performed. If the flag fITSStandAlone is true, the tracking
 126   // is done in the ITS only. In the standard reconstruction chain this option
 127   // can be set via AliReconstruction::SetOption("ITS","onlyITS")
 128   Int_t rc=0;
 129   if(!fITSStandAlone){
 130     rc=AliITStrackerMI::Clusters2Tracks(event); // should not be used !!
 131     // Note standalone tracking is implememted in "AliITStrackerU"
 132   }
 133   else {
 134     AliDebug(1,"Stand Alone flag set: doing tracking in ITS alone\n");
 135   }
 136   if(!rc){
 137     rc=FindTracks(event,kFALSE);
 138     if(AliITSReconstructor::GetRecoParam()->GetSAUseAllClusters()==kTRUE) {
 139       rc=FindTracks(event,kTRUE); // eventually a 2nd time ??????
 140     }
 141   }
 142   return rc;
 143 }
 144 //_________________________________________________-
 145 void AliITStrackerUpgrade::Init(){
 146   //  Reset all data members
 147   const Int_t nL = fNLayers;
 148   fPhiEstimate=0;
 149   for(Int_t i=0;i<2;i++){fPoint1[i]=0;fPoint2[i]=0;fPoint3[i]=0;}
 150   fLambdac=0;
 151   fPhic=0;
 152   fCoef1=0;
 153   fCoef2=0;
 154   fCoef3=0;
 155   fPointc[0]=0;
 156   fPointc[1]=0;
 157   fVert = 0;
 158   fVertexer = 0;
 159   Int_t nLoops=AliITSReconstructor::GetRecoParam()->GetNLoopsSA();
 160   if(nLoops==33){
 161     SetFixedWindowSizes();
 162   }else{
 163     Double_t phimin=AliITSReconstructor::GetRecoParam()->GetMinPhiSA();
 164     Double_t phimax=AliITSReconstructor::GetRecoParam()->GetMaxPhiSA();
 165     Double_t lambmin=AliITSReconstructor::GetRecoParam()->GetMinLambdaSA();
 166     Double_t lambmax=AliITSReconstructor::GetRecoParam()->GetMaxLambdaSA();
 167     SetCalculatedWindowSizes(nLoops,phimin,phimax,lambmin,lambmax);
 168   }
 169   fMinQ=AliITSReconstructor::GetRecoParam()->GetSAMinClusterCharge();
 170   fITSclusters = 0;
 171   SetOuterStartLayer(1);
 172   SetSAFlag(kFALSE);
 173   fListOfTracks=new TClonesArray("AliITStrackU",100);
 174   fListOfUTracks=new TClonesArray("AliITStrackU",100);
 175   fLayers=new AliITSlayerUpgrade*[nL];//to be fixed
 176   fCluLayer = 0;
 177   fCluCoord = 0;
 178   fMinNPoints = 3;
 179   for(Int_t layer=0; layer<fNLayers; layer++){
 180     Double_t p=0.;
 181     Double_t zC= 0.;
 182     fLayers[layer] = new AliITSlayerUpgrade(p,zC);
 183   }
 184
 185   fSegmentation = new AliITSsegmentationUpgrade();
 186
 187 }
 188 //_______________________________________________________________________
 189 Int_t AliITStrackerUpgrade::LoadClusters(TTree *clusTree){
 190   //
 191   // Load clusters for tracking
 192   //
 193
 194   TClonesArray statITSCluster("AliITSRecPointU");
 195   TClonesArray *itsCluster = &statITSCluster;
 196
 197   TBranch* itsClusterBranch=clusTree->GetBranch("ITSRecPoints");
 198   if (!itsClusterBranch){
 199     AliError("can't get the branch with the ITS clusters ! \n");
 200     return 1;
 201   }
 202   itsClusterBranch->SetAddress(&itsCluster);
 203   clusTree->GetEvent(0);
 204   Int_t nCluster = itsCluster->GetEntriesFast();
 205   for(Int_t i=0; i<nCluster; i++){
 206     AliITSRecPointU *recp = (AliITSRecPointU*)itsCluster->UncheckedAt(i);
 207     fLayers[recp->GetLayer()]->InsertCluster(new AliITSRecPointU(*recp));
 208   }//loop clusters
 209
 210   SetClusterTree(clusTree);
 211   return 0;
 212 }
 213
 214 //_______________________________________________________
 215 void AliITStrackerUpgrade::ResetForFinding(){
 216   //  Reset data members used in all loops during track finding
 217   fPhiEstimate=0;
 218   for(Int_t i=0;i<2;i++){fPoint1[i]=0;fPoint2[i]=0;fPoint3[i]=0;}
 219   fLambdac=0;
 220   fPhic=0;
 221   fCoef1=0;
 222   fCoef2=0;
 223   fCoef3=0;
 224   fPointc[0]=0;
 225   fPointc[1]=0;
 226   fListOfTracks->Clear();
 227   fListOfUTracks->Clear();
 228 }
 229
 230 //______________________________________________________________________
 231 Int_t AliITStrackerUpgrade::FindTracks(AliESDEvent* event,Bool_t useAllClusters){
 232
 233   // Track finder using the ESD object
 234   AliDebug(2,Form(" field is %f",event->GetMagneticField()));
 235
 236   if(!fITSclusters){
 237     Fatal("FindTracks","ITS cluster tree is not accessed - Abort!!!\n Please use method SetClusterTree to pass the pointer to the tree\n");
 238     return -1;
 239   }
 240
 241   // Reads event and mark clusters of tracks already found, with flag kITSin
 242   Int_t nentr=event->GetNumberOfTracks();
 243   if(!useAllClusters) {
 244     while (nentr--) {
 245       AliESDtrack *track=event->GetTrack(nentr);
 246       if ((track->GetStatus()&AliESDtrack::kITSin) == AliESDtrack::kITSin){
 247         Int_t idx[12];
 248         Int_t ncl = track->GetITSclusters(idx);
 249         for(Int_t k=0;k<ncl;k++){
 250           AliITSRecPointU* cll = (AliITSRecPointU*)GetCluster(idx[k]);
 251           cll->SetBit(kSAflag);
 252         }
 253       }
 254     }
 255   }else{
 256     while (nentr--) {
 257       AliESDtrack *track=event->GetTrack(nentr);
 258       if ((track->GetStatus()&AliESDtrack::kITSin) == AliESDtrack::kITSin){
 259         Int_t idx[12];
 260         Int_t ncl = track->GetITSclusters(idx);
 261         for(Int_t k=0;k<ncl;k++){
 262           AliITSRecPointU* cll = (AliITSRecPointU*)GetCluster(idx[k]);
 263           cll->ResetBit(kSAflag);
 264         }
 265       }
 266     }
 267   }
 268   //Get primary vertex
 269   Double_t primaryVertex[3];
 270   event->GetVertex()->GetXYZ(primaryVertex);
 271   Int_t nclusters[fNLayers];
 272   for(Int_t i=0; i<fNLayers; i++){
 273     nclusters[i]=0;
 274   }
 275
 276   Int_t dmar[fNLayers];
 277   for(Int_t i=0; i<fNLayers; i++){
 278     dmar[i]=0;
 279   }
 280
 281   if (fCluLayer == 0) {
 282     fCluLayer = new TClonesArray*[fNLayers];
 283     fCluCoord = new TClonesArray*[fNLayers];
 284     for(Int_t i=0;i<fNLayers;i++) {
 285       fCluLayer[i]=0;
 286       fCluCoord[i]=0;
 287     }
 288   }
 289   for(Int_t i=0;i<fNLayers;i++){
 290     if (!ForceSkippingOfLayer(i)) {
 291       for(Int_t cli=0;cli<fLayers[i]->GetNumberOfClusters();cli++){
 292         AliITSRecPointU* cls = (AliITSRecPointU*)fLayers[i]->GetCluster(cli);
 293         if(cls->TestBit(kSAflag)==kTRUE) continue; //clusters used by TPC prol.
 294         if(cls->GetQ()==0) continue; //fake clusters dead zones
 295         if(i>1 && cls->GetQ()<=fMinQ) continue; // cut on SDD and SSD cluster charge
 296         nclusters[i]++;
 297       }
 298     }
 299     dmar[i]=0;
 300     if(!fCluLayer[i]){
 301       fCluLayer[i] = new TClonesArray("AliITSRecPointU",nclusters[i]);
 302     }else{
 303       fCluLayer[i]->Delete();
 304       fCluLayer[i]->Expand(nclusters[i]);
 305     }
 306     if(!fCluCoord[i]){
 307       fCluCoord[i] = new TClonesArray("AliITSclusterTable",nclusters[i]);
 308     }else{
 309       fCluCoord[i]->Delete();
 310       fCluCoord[i]->Expand(nclusters[i]);
 311     }
 312   }
 313   for(Int_t ilay=0;ilay<fNLayers;ilay++){
 314     TClonesArray &clulay = *fCluLayer[ilay];
 315     TClonesArray &clucoo = *fCluCoord[ilay];
 316     if (!ForceSkippingOfLayer(ilay)){
 317       AliDebug(2,Form("number of clusters in layer %i : %i",ilay,fLayers[ilay]->GetNumberOfClusters()));
 318       for(Int_t cli=0;cli<fLayers[ilay]->GetNumberOfClusters();cli++){
 319         AliITSRecPointU* cls = (AliITSRecPointU*)fLayers[ilay]->GetCluster(cli);
 320         if(cls->TestBit(kSAflag)==kTRUE) continue;
 321         if(cls->GetQ()==0) continue;
 322         Double_t phi=0;Double_t lambda=0;
 323         Double_t x=0;Double_t y=0;Double_t z=0;
 324         Float_t sx=0;Float_t sy=0;Float_t sz=0;
 325         GetCoorAngles(cls,phi,lambda,x,y,z,primaryVertex);
 326         GetCoorErrors(cls,sx,sy,sz);
 327         new (clulay[dmar[ilay]]) AliITSRecPoint(*cls);
 328         new (clucoo[dmar[ilay]]) AliITSclusterTable(x,y,z,sx,sy,sz,phi,lambda,cli);
 329         dmar[ilay]++;
 330       }
 331     } else AliDebug(2,Form("Force skipping layer %i",ilay));
 332   }
 333
 334
 335   // track counter
 336   Int_t ntrack=0;
 337
 338   static Int_t nClusLay[fgMaxNLayer];//counter for clusters on each layer
 339   Int_t startLayForSeed=0;
 340   Int_t lastLayForSeed=fOuterStartLayer;
 341   Int_t nSeedSteps=lastLayForSeed-startLayForSeed;
 342   Int_t seedStep=1;
 343   if(fInwardFlag){
 344     startLayForSeed=fNLayers-1;
 345     lastLayForSeed=fInnerStartLayer;
 346     nSeedSteps=startLayForSeed-lastLayForSeed;
 347     seedStep=-1;
 348   }
 349   // loop on minimum number of points
 350   for(Int_t iMinNPoints=fNLayers; iMinNPoints>=fMinNPoints; iMinNPoints--) {
 351     // loop on starting layer for track finding
 352     for(Int_t iSeedLay=0; iSeedLay<=nSeedSteps; iSeedLay++) {
 353       Int_t theLay=startLayForSeed+iSeedLay*seedStep;
 354       if(ForceSkippingOfLayer(theLay)) continue;
 355       Int_t minNPoints=iMinNPoints-theLay;
 356       if(fInwardFlag) minNPoints=iMinNPoints-(fNLayers-1-theLay);
 357       for(Int_t i=theLay+1;i<fNLayers;i++)
 358         if(ForceSkippingOfLayer(i))
 359           minNPoints--;
 360       if(minNPoints<fMinNPoints) continue;
 361
 362       // loop on phi and lambda window size
 363       for(Int_t nloop=0;nloop<fNloop;nloop++){
 364         Int_t nclTheLay=fCluLayer[theLay]->GetEntriesFast();
 365         while(nclTheLay--){
 366           ResetForFinding();
 367           Bool_t useRP=SetFirstPoint(theLay,nclTheLay,primaryVertex);
 368           if(!useRP) continue;
 369           AliITStrackU trs(fNLayers);
 370
 371           Int_t pflag=0;
 372           Int_t kk;
 373           for(kk=0;kk<fNLayers;kk++) nClusLay[kk] = 0;
 374           kk=0;
 375           nClusLay[kk] = SearchClusters(theLay,fPhiWin[nloop],fLambdaWin[nloop],
 376                                         &trs,primaryVertex[2],pflag);
 377           Int_t nextLay=theLay+seedStep;
 378           if(nextLay<0){
 379           AliWarning("Negative layer id. Please check!");
 380           continue;
 381           }
 382           Bool_t goon=kTRUE;
 383           while(goon){
 384
 385             kk++;
 386             nClusLay[kk] = SearchClusters(nextLay,fPhiWin[nloop],fLambdaWin[nloop],
 387                                           &trs,primaryVertex[2],pflag);
 388             if(nClusLay[kk]!=0){
 389
 390               pflag=1;
 391               if(kk==1) {
 392                 fPoint3[0]=fPointc[0];
 393                 fPoint3[1]=fPointc[1];
 394               } else {
 395                 UpdatePoints();
 396               }
 397             }
 398             nextLay+=seedStep;
 399             if(nextLay<0 || nextLay==fNLayers) goon=kFALSE;
 400           }
 401
 402
 403           Int_t layOK=0;
 404           if(!fInwardFlag){
 405             for(Int_t nnp=0;nnp<fNLayers-theLay;nnp++){
 406               if(nClusLay[nnp]!=0) layOK+=1;
 407             }
 408           }else{
 409             for(Int_t nnp=theLay; nnp>=0; nnp--){
 410               if(nClusLay[nnp]!=0) layOK+=1;
 411             }
 412           }
 413           if(layOK>=minNPoints){
 414             //    AliDebug(2,Form("---NPOINTS: %d; MAP: %d %d %d %d %d %d %d\n",layOK,nClusLay[0],nClusLay[1],nClusLay[2],nClusLay[3],nClusLay[4],nClusLay[5],nClusLay[6]));
 415             AliITStrackV2* tr2 = 0;
 416             Bool_t onePoint = kFALSE;
 417             tr2 = FitTrack(&trs,primaryVertex,onePoint);
 418             if(!tr2){
 419               continue;
 420             }
 421             //      AliDebug(2,Form("---NPOINTS fit: %d\n",tr2->GetNumberOfClusters()));
 422
 423             StoreTrack(tr2,event,useAllClusters);
 424             ntrack++;
 425
 426           }
 427
 428         }//end loop on clusters of theLay
 429       } //end loop on window sizes
 430     } //end loop on theLay
 431   }//end loop on min points
 432   if(!useAllClusters) AliInfo(Form("Number of found tracks: %d",event->GetNumberOfTracks()));
 433
 434   ResetForFinding();
 435   return 0;
 436
 437 }
 438
 439 //________________________________________________________________________
 440
 441 AliITStrackV2* AliITStrackerUpgrade::FitTrack(AliITStrackU* tr,Double_t *primaryVertex,Bool_t onePoint) {
 442
 443   const Int_t kMaxClu=AliITStrackU::kMaxNumberOfClusters;
 444
 445   static Int_t clind[fgMaxNLayer][kMaxClu];
 446   static Int_t clmark[fgMaxNLayer][kMaxClu];
 447   static Int_t end[fgMaxNLayer];
 448   static AliITSRecPointU *listlayer[fgMaxNLayer][kMaxClu];
 449   static Int_t indices[fgMaxNLayer];
 450
 451   for(Int_t k=0;k<fgMaxNLayer; k++)end[k]=0;
 452
 453   for(Int_t i=0;i<fNLayers;i++) {
 454     for(Int_t j=0;j<kMaxClu; j++){
 455       clind[i][j]=0;
 456       clmark[i][j]=0;
 457       listlayer[i][j]=0;
 458     }
 459   }
 460   Int_t inx[fNLayers];
 461   for (Int_t k=0; k<fNLayers; k++) inx[k]=-1;
 462   Int_t nclusters = tr->GetNumberOfClustersU();
 463   for(Int_t ncl=0;ncl<nclusters;ncl++){
 464     Int_t index = tr->GetClusterIndexU(ncl);
 465     Int_t lay = (index & 0xf0000000) >> 28;
 466     //Int_t cli = index&0x0fffffff;
 467     //AliITSRecPoint* cl = (AliITSRecPoint*)fLayers[lay]->GetCluster(cli);
 468     AliITSRecPointU* cl = (AliITSRecPointU*)GetCluster(index);
 469     if(cl->TestBit(kSAflag)==kTRUE) cl->ResetBit(kSAflag);
 470     inx[lay]=index;
 471
 472     Int_t nInLay=end[lay];
 473     listlayer[lay][nInLay]=cl;
 474     clind[lay][nInLay]=index;
 475     end[lay]++;
 476   }
 477
 478   for(Int_t nlay=0;nlay<fNLayers;nlay++){
 479     for(Int_t ncl=0;ncl<tr->GetNumberOfMarked(nlay);ncl++){
 480       Int_t mark = tr->GetClusterMark(nlay,ncl);
 481       clmark[nlay][ncl]=mark;
 482     }
 483   }
 484
 485
 486   Int_t firstLay=-1,secondLay=-1;
 487   for(Int_t i=0;i<fNLayers;i++) {
 488     if(end[i]==0) {
 489       end[i]=1;
 490     }else{
 491       if(firstLay==-1) {
 492         firstLay=i;
 493       } else if(secondLay==-1) {
 494         secondLay=i;
 495       }
 496     }
 497   }
 498
 499   //---adding initialization for non existent layers
 500   for(Int_t i=fNLayers;i<fgMaxNLayer;i++) {
 501     if(end[i]==0) {
 502       end[i]=1;
 503     }
 504   }
 505
 506
 507
 508   if(firstLay==-1 || (secondLay==-1 && !onePoint)) return 0;
 509
 510   TClonesArray &arrSA= *fListOfUTracks;
 511   Int_t nFoundTracks=0;
 512
 513
 514   for(Int_t l0=0;l0<end[0];l0++){ //loop on layer 1
 515     indices[0]=l0;
 516     for(Int_t l1=0;l1<end[1];l1++){ //loop on layer 2
 517       indices[1]=l1;
 518       for(Int_t l2=0;l2<end[2];l2++){  //loop on layer 3
 519         indices[2]=l2;
 520         for(Int_t l3=0;l3<end[3];l3++){ //loop on layer 4
 521           indices[3]=l3;
 522           for(Int_t l4=0;l4<end[4];l4++){ //loop on layer 5
 523             indices[4]=l4;
 524             for(Int_t l5=0;l5<end[5];l5++){ //loop on layer 6
 525               indices[5]=l5;
 526               for(Int_t l6=0;l6<end[6];l6++){//loop on layer 7
 527                 indices[6]=l6;
 528                 for(Int_t l7=0;l7<end[7];l7++){ //loop on layer 8
 529                   indices[7]=l7;
 530
 531                   Int_t iFirstLay=indices[firstLay];
 532                   Int_t mrk1=clmark[firstLay][iFirstLay];
 533
 534                   Double_t x1,y1,z1,sx1,sy1,sz1;
 535                   Double_t x2,y2,z2,sx2,sy2,sz2;
 536                   AliITSRecPointU* p1=(AliITSRecPointU*)listlayer[firstLay][iFirstLay];
 537                   Int_t layer = 0;
 538                   Double_t radius = 0.;
 539                   Double_t yclu1 = p1->GetY();
 540                   Double_t zclu1 = p1->GetZ();
 541                   layer=p1->GetLayer();
 542                   radius = fSegmentation->GetRadius(layer);
 543                   Double_t cv=0.,tgl2=0.,phi2=0.;
 544                   AliITSclusterTable* arr1 = (AliITSclusterTable*)GetClusterCoord(firstLay,mrk1);
 545                   x1 = arr1->GetX();
 546                   y1 = arr1->GetY();
 547                   z1 = arr1->GetZ();
 548                   sx1 = arr1->GetSx();
 549                   sy1 = arr1->GetSy();
 550                   sz1 = arr1->GetSz();
 551
 552                   if(secondLay>0) {
 553                     Int_t iSecondLay=indices[secondLay];
 554                     Int_t mrk2=clmark[secondLay][iSecondLay];
 555                     AliITSclusterTable* arr2 = (AliITSclusterTable*)GetClusterCoord(secondLay,mrk2);
 556                     x2 = arr2->GetX();
 557                     y2 = arr2->GetY();
 558                     z2 = arr2->GetZ();
 559                     sx2 = arr2->GetSx();
 560                     sy2 = arr2->GetSy();
 561                     sz2 = arr2->GetSz();
 562                     cv = Curvature(primaryVertex[0],primaryVertex[1],x1,y1,x2,y2);
 563                     tgl2 = (z2-z1)/TMath::Sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1));
 564                     phi2 = TMath::ATan2((y2-y1),(x2-x1));
 565                   }
 566
 567                   Double_t x,y,z = 0.;
 568                   Double_t xz[2];
 569                   xz[0]= p1->GetDetLocalX();
 570                   xz[1]= p1->GetDetLocalZ();
 571                   fSegmentation->DetToGlobal(layer,p1->GetModule(),xz[0], xz[1],x,y,z);
 572
 573
 574                   Double_t phiclrad;
 575                   phiclrad=TMath::ATan2(y,x);
 576                   if (phiclrad<0) phiclrad+=TMath::TwoPi();
 577                   else if (phiclrad>=TMath::TwoPi()) phiclrad-=TMath::TwoPi();
 578
 579                   Double_t alpha = fSegmentation->GetAlpha(fSegmentation->GetModule(phiclrad));
 580
 581                   Int_t clIndice[fNLayers];
 582                   for (Int_t k=0; k<fNLayers; k++) clIndice[k]=-1;
 583
 584                   AliITStrackU trac(alpha,radius,yclu1,zclu1,phi2,tgl2,cv,1,fNLayers);
 585                   for(Int_t iLay=fNLayers-1; iLay>=0; iLay--){
 586                     Int_t iInLay=indices[iLay];
 587                     AliITSRecPointU* cl=(AliITSRecPointU*)listlayer[iLay][iInLay];
 588                     if(cl!=0){
 589                       trac.AddClusterV2(iLay,(clind[iLay][iInLay] & 0x0fffffff)>>0);
 590                       trac.AddClusterMark(iLay,clmark[iLay][iInLay]);
 591                       clIndice[iLay] = clind[iLay][iInLay];
 592                     }
 593                   }
 594
 595                   //fit with Kalman filter using RefitAtBase()
 596                   AliITStrackU ot(trac, kFALSE);
 597                   ot.ResetCovariance(10.);
 598                   ot.ResetClusters();
 599
 600                   // Propagate inside the innermost layer with a cluster
 601                   if(ot.Propagate(ot.GetX()-0.1*ot.GetX())) {
 602                    if(RefitAtBase(AliITSRecoParam::GetrInsideITSscreen(),&ot,clIndice)){ //fit from layer 1 to layer N
 603                       AliITStrackU otrack2(ot,kFALSE);
 604                       otrack2.ResetCovariance(10.);
 605                       otrack2.ResetClusters();
 606                       //fit from last layer to layer 1
 607                       if(RefitAtBase(fSegmentation->GetRadius(0)-0.1,&otrack2,clIndice)) {
 608                         new(arrSA[nFoundTracks]) AliITStrackU(otrack2);
 609                         ++nFoundTracks;
 610                       }
 611
 612                     }
 613                   }
 614
 615                 }//end loop layer 8
 616               }//end loop layer 7
 617             }//end loop layer 6
 618           }//end loop layer 5
 619         }//end loop layer 4
 620       }//end loop layer 3
 621     }//end loop layer 2
 622   }//end loop layer 1
 623
 624
 625
 626
 627   if(fListOfUTracks->GetEntries()==0) return 0;
 628
 629   Int_t lowchi2 = FindTrackLowChiSquare();
 630   AliITStrackU* otrack = (AliITStrackU*)fListOfUTracks->At(lowchi2);
 631
 632   if(otrack==0) {
 633     return 0;
 634   }
 635
 636   //  CookLabel(otrack,0.); //MI change - to see fake ratio
 637   //  printf("  label from CookLabel: %d  \n   ",otrack->GetLabel());
 638
 639   Int_t label=FindLabel(otrack);
 640   otrack->SetLabel(label);
 641   //  printf("  label from FindLabel: %d  \n   ",otrack->GetLabel());
 642
 643   Int_t indexc[fNLayers];
 644   for(Int_t i=0;i<fNLayers;i++) indexc[i]=0;
 645   for(Int_t nind=0;nind<otrack->GetNumberOfClusters();nind++){
 646     indexc[nind] = otrack->GetClusterIndex(nind);
 647   }
 648
 649
 650   //remove clusters of found track
 651   for(Int_t nlay=0;nlay<fNLayers;nlay++){
 652     for(Int_t cln=0;cln<otrack->GetNumberOfMarked(nlay);cln++){
 653       Int_t index = otrack->GetClusterMark(nlay,cln);
 654       fCluLayer[nlay]->RemoveAt(index);
 655       RemoveClusterCoord(nlay,index);
 656       fCluLayer[nlay]->Compress();
 657     }
 658   }
 659
 660   return otrack;
 661
 662 }
 663
 664 //_______________________________________________________
 665 void AliITStrackerUpgrade::StoreTrack(AliITStrackV2 *t,AliESDEvent *event, Bool_t pureSA) /*const*/
 666 {
 667   //
 668   // Add new track to the ESD
 669   //
 670   AliESDtrack outtrack;
 671   outtrack.UpdateTrackParams(t,AliESDtrack::kITSin);
 672   if(pureSA) outtrack.SetStatus(AliESDtrack::kITSpureSA);
 673   outtrack.SetStatus(AliESDtrack::kITSout);
 674   outtrack.SetStatus(AliESDtrack::kITSrefit);
 675   Double_t sdedx[4]={0.,0.,0.,0.};
 676   for(Int_t i=0; i<4; i++) sdedx[i]=t->GetSampledEdx(i);
 677   outtrack.SetITSdEdxSamples(sdedx);
 678   event->AddTrack(&outtrack);
 679   return;
 680 }
 681
 682
 683 //_______________________________________________________
 684 Int_t AliITStrackerUpgrade::SearchClusters(Int_t layer,Double_t phiwindow,Double_t lambdawindow, AliITStrackU* trs,Double_t /*zvertex*/,Int_t pflag){
 685   //function used to to find the clusters associated to the track
 686
 687   AliDebug(2,"Starting...");
 688   if(ForceSkippingOfLayer(layer)) {
 689     AliDebug(2,Form("Forcing skipping of layer %i. Exiting",layer));
 690     return 0;
 691   }
 692
 693   Int_t nc=0;
 694   Double_t r=fSegmentation->GetRadius(layer);
 695   if(pflag==1){
 696     Float_t cx1,cx2,cy1,cy2;
 697     FindEquation(fPoint1[0],fPoint1[1],fPoint2[0],fPoint2[1],fPoint3[0],fPoint3[1],fCoef1,fCoef2,fCoef3);
 698     if (FindIntersection(fCoef1,fCoef2,fCoef3,-r*r,cx1,cy1,cx2,cy2)==0)
 699       return 0;
 700     Double_t fi1=TMath::ATan2(cy1-fPoint1[1],cx1-fPoint1[0]);
 701     Double_t fi2=TMath::ATan2(cy2-fPoint1[1],cx2-fPoint1[0]);
 702     fPhiEstimate=ChoosePoint(fi1,fi2,fPhic);
 703   }
 704
 705
 706   Double_t phiExpect=fPhiEstimate;
 707   Double_t lamExpect=fLambdac;
 708
 709   Int_t ncl = fCluLayer[layer]->GetEntriesFast();
 710   for (Int_t index=0; index<ncl; index++) {
 711
 712     AliITSclusterTable* arr = (AliITSclusterTable*)GetClusterCoord(layer,index);
 713
 714     Double_t lambda = arr->GetLambda();
 715     if (TMath::Abs(lambda-lamExpect)>lambdawindow) continue;
 716
 717     Double_t phi = arr->GetPhi();
 718     Double_t deltaPhi = phi-phiExpect;
 719     if(deltaPhi>TMath::Pi()) deltaPhi-=2*TMath::Pi();
 720     else if(deltaPhi<-TMath::Pi()) deltaPhi+=2*TMath::Pi();
 721     if (TMath::Abs(deltaPhi)>phiwindow) continue;
 722
 723     if(trs->GetNumberOfClustersU()==trs->GetMaxNumberOfClusters()) return 0;
 724     if(trs->GetNumberOfMarked(layer)==trs->GetMaxNMarkedPerLayer()) return 0;
 725     Int_t orind = arr->GetOrInd();
 726     trs->AddClusterU(layer,orind);
 727     trs->AddClusterMark(layer,index);
 728     nc++;
 729     fLambdac=lambda;
 730     fPhiEstimate=phi;
 731
 732     fPointc[0]=arr->GetX();
 733     fPointc[1]=arr->GetY();
 734
 735   }
 736   return nc;
 737
 738 }
 739
 740 //________________________________________________________________
 741 Bool_t AliITStrackerUpgrade::SetFirstPoint(Int_t lay, Int_t clu, Double_t* primaryVertex){
 742   // Sets the first point (seed) for tracking
 743
 744   AliITSRecPointU* cl = (AliITSRecPointU*)fCluLayer[lay]->At(clu);
 745   if(!cl) return kFALSE;
 746   if (cl->GetQ()<=0) return kFALSE;
 747   if(lay>1 && cl->GetQ()<=fMinQ) return kFALSE;
 748   AliITSclusterTable* arr = (AliITSclusterTable*)GetClusterCoord(lay,clu);
 749   fPhic = arr->GetPhi();
 750   fLambdac = arr->GetLambda();
 751   fPhiEstimate = fPhic;
 752   fPoint1[0]=primaryVertex[0];
 753   fPoint1[1]=primaryVertex[1];
 754   fPoint2[0]=arr->GetX();
 755   fPoint2[1]=arr->GetY();
 756   return kTRUE;
 757 }
 758
 759 //________________________________________________________________
 760 void AliITStrackerUpgrade::UpdatePoints(){
 761   //update of points for the estimation of the curvature
 762
 763   fPoint2[0]=fPoint3[0];
 764   fPoint2[1]=fPoint3[1];
 765   fPoint3[0]=fPointc[0];
 766   fPoint3[1]=fPointc[1];
 767 }
 768 //___________________________________________________________________
 769 Int_t AliITStrackerUpgrade::FindEquation(Float_t x1, Float_t y1, Float_t x2, Float_t y2, Float_t x3, Float_t y3,Float_t& a, Float_t& b, Float_t& c){
 770
 771   //given (x,y) of three recpoints (in global coordinates)
 772   //returns the parameters a,b,c of circonference x*x + y*y +a*x + b*y +c
 773
 774   Float_t den = (x3-x1)*(y2-y1)-(x2-x1)*(y3-y1);
 775   if(den==0) return 0;
 776   a = ((y3-y1)*(x2*x2+y2*y2-x1*x1-y1*y1)-(y2-y1)*(x3*x3+y3*y3-x1*x1-y1*y1))/den;
 777   b = -(x2*x2-x1*x1+y2*y2-y1*y1+a*(x2-x1))/(y2-y1);
 778   c = -x1*x1-y1*y1-a*x1-b*y1;
 779   return 1;
 780 }
 781 //__________________________________________________________________________
 782 Int_t AliITStrackerUpgrade::FindIntersection(Float_t a1, Float_t b1, Float_t c1, Float_t c2,Float_t& x1,Float_t& y1, Float_t& x2, Float_t& y2){
 783
 784   //Finds the intersection between the circonference of the track and the circonference centered in (0,0) represented by one layer
 785   //c2 is -rlayer*rlayer
 786
 787   if(a1==0) return 0;
 788   Double_t m = c2-c1;
 789   Double_t aA = (b1*b1)/(a1*a1)+1;
 790   Double_t bB = (-2*m*b1/(a1*a1));
 791   Double_t cC = c2+(m*m)/(a1*a1);
 792   Double_t dD = bB*bB-4*aA*cC;
 793   if(dD<0) return 0;
 794
 795   y1 = (-bB+TMath::Sqrt(dD))/(2*aA);
 796   y2 = (-bB-TMath::Sqrt(dD))/(2*aA);
 797   x1 = (c2-c1-b1*y1)/a1;
 798   x2 = (c2-c1-b1*y2)/a1;
 799
 800   return 1;
 801 }
 802 //____________________________________________________________________
 803 Double_t AliITStrackerUpgrade::Curvature(Double_t x1,Double_t y1,Double_t
 804                                          x2,Double_t y2,Double_t x3,Double_t y3){
 805
 806   //calculates the curvature of track
 807   Double_t den = (x3-x1)*(y2-y1)-(x2-x1)*(y3-y1);
 808   if(den==0) return 0;
 809   Double_t a = ((y3-y1)*(x2*x2+y2*y2-x1*x1-y1*y1)-(y2-y1)*(x3*x3+y3*y3-x1*x1-y1*y1))/den;
 810   Double_t b = -(x2*x2-x1*x1+y2*y2-y1*y1+a*(x2-x1))/(y2-y1);
 811   Double_t c = -x1*x1-y1*y1-a*x1-b*y1;
 812   Double_t xc=-a/2.;
 813
 814   if((a*a+b*b-4*c)<0) return 0;
 815   Double_t rad = TMath::Sqrt(a*a+b*b-4*c)/2.;
 816   if(rad==0) return 0;
 817
 818   if((x1>0 && y1>0 && x1<xc)) rad*=-1;
 819   if((x1<0 && y1>0 && x1<xc)) rad*=-1;
 820   //  if((x1<0 && y1<0 && x1<xc)) rad*=-1;
 821   // if((x1>0 && y1<0 && x1<xc)) rad*=-1;
 822
 823   return 1/rad;
 824
 825 }
 826 //____________________________________________________________________
 827 Double_t AliITStrackerUpgrade::ChoosePoint(Double_t p1, Double_t p2, Double_t pp){
 828
 829   //Returns the point closest to pp
 830
 831   Double_t diff1 = p1-pp;
 832   Double_t diff2 = p2-pp;
 833
 834   if(TMath::Abs(diff1)<TMath::Abs(diff2)) fPhiEstimate=p1;
 835   else fPhiEstimate=p2;
 836   return fPhiEstimate;
 837
 838 }
 839 //_________________________________________________________________
 840 Int_t AliITStrackerUpgrade::FindTrackLowChiSquare() const {
 841
 842   // returns track with lowest chi square
 843
 844 Int_t dim=fListOfUTracks->GetEntries();
 845   if(dim<=1) return 0;
 846   AliITStrackV2* trk = (AliITStrackV2*)fListOfUTracks->At(0);
 847   Double_t minChi2=trk->GetChi2()/trk->GetNumberOfClusters();
 848   Int_t index=0;
 849   for(Int_t i=1;i<dim;i++){
 850     trk = (AliITStrackV2*)fListOfUTracks->At(i);
 851     Double_t chi2=trk->GetChi2()/trk->GetNumberOfClusters();
 852     if(chi2<minChi2){
 853       minChi2=chi2;
 854       index=i;
 855     }
 856   }
 857   return index;
 858
 859 }
 860
 861 //__________________________________________________________
 862 Int_t AliITStrackerUpgrade::FindLabel(AliITStrackV2* track) const {
 863   //
 864   // max number of labels in AliITSRecPointU is 24;
 865   enum {kMaxLab=24};
 866
 867   Int_t labl[fNLayers][kMaxLab];
 868   Int_t cnts[fNLayers][kMaxLab];
 869   for(Int_t j=0;j<fNLayers;j++){
 870     for(Int_t k=0;k<kMaxLab;k++){
 871       labl[j][k]=-2;
 872       cnts[j][k]=1;
 873     }
 874   }
 875   Int_t iNotLabel=0;
 876   for(Int_t i=0;i<track->GetNumberOfClusters(); i++) {
 877     Int_t indexc = track->GetClusterIndex(i);
 878     AliITSRecPointU* cl = (AliITSRecPointU*)GetCluster(indexc);
 879     //  AliDebug(2,Form("Layer %d; cluster index %i; MClabels=(%d,%d,%d) ",
 880     //              cl->GetLayer(),indexc,cl->GetLabel(0),cl->GetLabel(1),cl->GetLabel(2)));
 881     Int_t iLayer=cl->GetLayer();
 882     for(Int_t k=0;k<kMaxLab;k++){
 883       labl[iLayer][k]=cl->GetTrackID(k);
 884       if(labl[iLayer][k]<0) iNotLabel++;
 885     }
 886   }
 887   if(iNotLabel==kMaxLab*track->GetNumberOfClusters()) return -2; // No MC label found at all
 888
 889   for(Int_t j1=0;j1<fNLayers; j1++) {
 890     for(Int_t j2=0; j2<j1;  j2++){
 891       for(Int_t k1=0; k1<kMaxLab; k1++){
 892         for(Int_t k2=0; k2<kMaxLab; k2++){
 893           if(labl[j1][k1]>=0 && labl[j1][k1]==labl[j2][k2] && cnts[j2][k2]>0){
 894             cnts[j2][k2]++;
 895             cnts[j1][k1]=0;
 896           }
 897         }
 898       }
 899     }
 900   }
 901
 902
 903   Int_t cntMax=0;
 904   Int_t label=-1;
 905   for(Int_t j=0;j<fNLayers;j++){
 906     for(Int_t k=0;k<kMaxLab;k++){
 907       if(cnts[j][k]>cntMax && labl[j][k]>=0){
 908         cntMax=cnts[j][k];
 909         label=labl[j][k];
 910       }
 911     }
 912   }
 913
 914   Int_t lflag=0;
 915   for(Int_t i=0;i<fNLayers;i++) {
 916     Bool_t labelOkInLayer = kFALSE;
 917     for(Int_t k=0;k<kMaxLab;k++){
 918       if (labl[i][k]==label) {
 919         labelOkInLayer=kTRUE;
 920         break;
 921       }
 922     }
 923     if(labelOkInLayer) lflag++;
 924   }
 925   if(lflag<track->GetNumberOfClusters()) {
 926     if (label==0) {
 927       label = -1; // to avoid label 0 which can not be identified as as fake with -0
 928     } else {
 929       label = -label;
 930     }
 931   }
 932   if (label<0) {
 933     for(Int_t i=0;i<track->GetNumberOfClusters(); i++) {
 934       Int_t indexc = track->GetClusterIndex(i);
 935       AliITSRecPointU* cl = (AliITSRecPointU*)GetCluster(indexc);
 936       AliDebug(2,Form("Layer %d; cluster index %i; MClabels=(%d,%d,%d...) ",
 937                       cl->GetLayer(),indexc,cl->GetTrackID(0),cl->GetTrackID(1),cl->GetTrackID(2)));
 938     }
 939   }
 940
 941
 942   return label;
 943 }
 944
 945 //_____________________________________________________________________________
 946 void AliITStrackerUpgrade::SetCalculatedWindowSizes(Int_t n, Float_t phimin, Float_t phimax, Float_t lambdamin, Float_t lambdamax){
 947   // Set sizes of the phi and lambda windows used for track finding
 948   fNloop = n;
 949   if(fPhiWin) delete [] fPhiWin;
 950   if(fLambdaWin) delete [] fLambdaWin;
 951   fPhiWin = new Double_t[fNloop];
 952   fLambdaWin = new Double_t[fNloop];
 953   Float_t stepPhi=(phimax-phimin)/(Float_t)(fNloop-1);
 954   Float_t stepLambda=(lambdamax-lambdamin)/(Float_t)(fNloop-1);
 955   for(Int_t k=0;k<fNloop;k++){
 956     Float_t phi=phimin+k*stepPhi;
 957     Float_t lam=lambdamin+k*stepLambda;
 958     fPhiWin[k]=phi;
 959     fLambdaWin[k]=lam;
 960   }
 961 }
 962 //_____________________________________________________________________________
 963 void AliITStrackerUpgrade::SetFixedWindowSizes(Int_t n, Double_t *phi, Double_t *lam){
 964   // Set sizes of the phi and lambda windows used for track finding
 965   fNloop = n;
 966   if(phi){ // user defined values
 967     fPhiWin = new Double_t[fNloop];
 968     fLambdaWin = new Double_t[fNloop];
 969     for(Int_t k=0;k<fNloop;k++){
 970       fPhiWin[k]=phi[k];
 971       fLambdaWin[k]=lam[k];
 972     }
 973   }
 974   else {  // default values
 975
 976     Double_t phid[33]   = {0.002,0.003,0.004,0.0045,0.0047,
 977                            0.005,0.0053,0.0055,
 978                            0.006,0.0063,0.0065,0.007,0.0073,0.0075,0.0077,
 979                            0.008,0.0083,0.0085,0.0087,0.009,0.0095,0.0097,
 980                            0.01,0.0105,0.011,0.0115,0.012,0.0125,0.013,0.0135,0.0140,0.0145};
 981     Double_t lambdad[33] = {0.003,0.004,0.005,0.005,0.005,
 982                             0.005,0.005,0.006,
 983                             0.006,0.006,0.006,0.007,0.007,0.007,0.007,
 984                             0.007,0.007,0.007,0.007,0.007,0.007,0.007,
 985                             0.008,0.008,0.008,0.008,0.008,0.008,0.008,0.008,0.008,0.008};
 986
 987     if(fNloop!=33){
 988       fNloop = 33;
 989     }
 990
 991
 992     fPhiWin = new Double_t[fNloop];
 993     fLambdaWin = new Double_t[fNloop];
 994
 995     Double_t factor=AliITSReconstructor::GetRecoParam()->GetFactorSAWindowSizes();
 996
 997     for(Int_t k=0;k<fNloop;k++){
 998       fPhiWin[k]=phid[k]*factor;
 999       fLambdaWin[k]=lambdad[k]*factor;
1000     }
1001
1002   }
1003
1004 }
1005 //_______________________________________________________________________
1006 void AliITStrackerUpgrade::GetCoorAngles(AliITSRecPointU* cl,Double_t &phi,Double_t &lambda, Double_t &x, Double_t &y,Double_t &z,Double_t* vertex){
1007   //Returns values of phi (azimuthal) and lambda angles for a given cluster
1008
1009   Double_t xz[2];
1010   xz[0]= cl->GetDetLocalX();
1011   xz[1]= cl->GetDetLocalZ() ;
1012   Int_t ilayer;
1013   ilayer = cl->GetLayer();
1014   fSegmentation->DetToGlobal(ilayer,cl->GetModule(),xz[0], xz[1],x,y,z);
1015
1016   if(x!=0 && y!=0)
1017     phi=TMath::ATan2(y-vertex[1],x-vertex[0]);
1018   lambda=TMath::ATan2(z-vertex[2],TMath::Sqrt((x-vertex[0])*(x-vertex[0])+(y-vertex[1])*(y-vertex[1])));
1019 }
1020
1021 //________________________________________________________________________
1022 void AliITStrackerUpgrade::GetCoorErrors(AliITSRecPointU* cl,Float_t &sx,Float_t &sy, Float_t &sz){
1023
1024   //returns sigmax, y, z of cluster in global coordinates
1025   /*
1026     Double_t rot[9];     fGeom->GetRotMatrix(module,rot);
1027     Int_t lay,lad,det;
1028     AliITSgeomTGeo::GetModuleId(module,lay,lad,det);
1029
1030     Double_t alpha=TMath::ATan2(rot[1],rot[0])+TMath::Pi();
1031     Double_t phi=TMath::Pi()/2+alpha;
1032     if (lay==1) phi+=TMath::Pi();
1033
1034     Float_t cp=TMath::Cos(phi), sp=TMath::Sin(phi);
1035   */
1036   Float_t covm[6];
1037   cl->GetGlobalCov(covm);
1038   sx=TMath::Sqrt(covm[0]);
1039   sy=TMath::Sqrt(covm[3]);
1040   sz=TMath::Sqrt(covm[5]);
1041
1042
1043
1044   //  Float_t covm[6];
1045   //  cl->GetGlobalCov(covm);
1046   //  sx=12*1e-04;//TMath::Sqrt(covm[0]);
1047   //  sy=12*1e-04;//TMath::Sqrt(covm[3]);
1048   //  sz=40*1e-04;//TMath::Sqrt(covm[5]);
1049   /*
1050     sx = TMath::Sqrt(sp*sp*cl->GetSigmaY2());
1051     sy = TMath::Sqrt(cp*cp*cl->GetSigmaY2());
1052     sz = TMath::Sqrt(cl->GetSigmaZ2());
1053   */
1054 }
1055 //_____________________________________________________________
1056 void AliITStrackerUpgrade::UnloadClusters() {
1057   //--------------------------------------------------------------------
1058   //This function unloads ITS clusters
1059   //--------------------------------------------------------------------
1060   for (Int_t i=0; i<fNLayers; i++) fLayers[i]->ResetClusters();
1061 }
1062 //______________________________________________________________________
1063 Bool_t AliITStrackerUpgrade::RefitAtBase(Double_t xx,AliITStrackU *track,
1064                                          const Int_t *clusters)
1065 {
1066   //--------------------------------------------------------------------
1067   // Simplified version for ITS upgrade studies -- does not use module info
1068   //--------------------------------------------------------------------
1069   Int_t index[fNLayers];
1070   Int_t k;
1071   for (k=0; k<fNLayers; k++) index[k]=-1;
1072   //
1073   for (k=0; k<fNLayers; k++) {
1074     index[k]=clusters[k];
1075   }
1076
1077   ULong_t trStatus=0;
1078   if(track->GetESDtrack()) trStatus=track->GetStatus();
1079   Int_t innermostlayer=0;
1080   if(trStatus&AliESDtrack::kTPCin)  {
1081     innermostlayer=fNLayers-1;
1082     Double_t drphi = TMath::Abs(track->GetD(0.,0.));
1083     for(innermostlayer=0; innermostlayer<fNLayers; innermostlayer++) {
1084       if( (drphi < (fSegmentation->GetRadius(innermostlayer)+1.)) ||
1085           index[innermostlayer] >= 0 ) break;
1086     }
1087     AliDebug(2,Form(" drphi  %f  innermost %d",drphi,innermostlayer));
1088   }
1089
1090   Int_t from, to, step;
1091   if (xx > track->GetX()) {
1092     from=innermostlayer; to=fNLayers;
1093     step=+1;
1094   } else {
1095     from=fNLayers-1; to=innermostlayer-1;
1096     step=-1;
1097   }
1098   TString dir = (step>0 ? "outward" : "inward");
1099
1100   for (Int_t ilayer = from; ilayer != to; ilayer += step) {
1101     Double_t r=0.;
1102     r=fSegmentation->GetRadius(ilayer);
1103
1104     if (step<0 && xx>r){
1105       break;
1106     }
1107
1108
1109     Double_t oldGlobXYZ[3];
1110
1111     if (!track->GetXYZ(oldGlobXYZ)) {
1112       return kFALSE;
1113     }
1114     // continue if we are already beyond this layer
1115     Double_t oldGlobR = TMath::Sqrt(oldGlobXYZ[0]*oldGlobXYZ[0]+oldGlobXYZ[1]*oldGlobXYZ[1]);
1116     if(step>0 && oldGlobR > r){
1117       continue; // going outward
1118     }
1119     if(step<0 && oldGlobR < r) {
1120       continue; // going inward
1121     }
1122     Double_t phi,z;
1123     if (!track->GetPhiZat(r,phi,z)){
1124       return kFALSE;
1125     } // only for ITS-SA tracks refit
1126     track->SetCheckInvariant(kFALSE);
1127
1128     if (phi<0) phi+=TMath::TwoPi();//from 0 to 360 (rad)
1129     else if (phi>=TMath::TwoPi()) phi-=TMath::TwoPi();//
1130
1131     Int_t trkModule = fSegmentation->GetModule(phi);
1132
1133     Double_t alpha = fSegmentation->GetAlpha(trkModule);
1134     if (!track->Propagate(alpha,r)) {
1135       return kFALSE;
1136     }
1137
1138     const AliITSRecPointU *clAcc=0;
1139     Double_t maxchi2=1000.*AliITSReconstructor::GetRecoParam()->GetMaxChi2();
1140
1141     Int_t idx=index[ilayer];
1142     if (idx>=0) { // cluster in this layer
1143       Int_t cli = idx&0x0fffffff;
1144       AliITSRecPointU *cl=(AliITSRecPointU *)fLayers[ilayer]->GetCluster(cli);
1145
1146       if (cl) {
1147         Int_t cllayer = (idx & 0xf0000000) >> 28;;
1148        // edge effect correction
1149         if(trkModule!=cl->GetModule()){
1150         if (!track->Propagate(fSegmentation->GetAlpha(cl->GetModule()),fSegmentation->GetRadius(ilayer))) return kFALSE;
1151         }
1152         Double_t chi2=GetPredictedChi2MI(track,cl,cllayer);
1153         if (chi2<maxchi2) {
1154           clAcc=cl;
1155           maxchi2=chi2;
1156         } else {
1157           return kFALSE;
1158         }
1159       }
1160     }
1161
1162     if (clAcc) {
1163       if (!UpdateMI(track,clAcc,maxchi2,idx)){
1164         return kFALSE;
1165       }
1166       track->SetSampledEdx(clAcc->GetQ(),ilayer-2);
1167     }
1168
1169
1170     // Correct for material of the current layer
1171     // cross material
1172     // add time if going outward
1173     if(!CorrectForLayerMaterial(track,ilayer,oldGlobXYZ,dir)){
1174       return kFALSE;
1175     }
1176     track->SetCheckInvariant(kFALSE);
1177   } // end loop on layers
1178
1179   if (!track->PropagateTo(xx,0.,0.)){
1180     return kFALSE;
1181   }
1182
1183   return kTRUE;
1184 }
1185
1186 //_____________________________________________________________________
1187 Int_t AliITStrackerUpgrade::UpdateMI(AliITStrackU* track, const AliITSRecPointU* cl,Double_t chi2,Int_t index) const
1188 {
1189   //
1190   // Update ITS track
1191   //
1192   Int_t layer = (index & 0xf0000000) >> 28;
1193   track->SetClIndex(layer, index);
1194   if (TMath::Abs(cl->GetQ())<1.e-13) return 0;  // ingore the "virtual" clusters
1195
1196
1197   // Take into account the mis-alignment (bring track to cluster plane)
1198   Double_t xTrOrig=track->GetX();
1199   Double_t trxyz[3]; track->GetXYZ(trxyz);
1200   Float_t xclu1 = cl->GetX();//upgrade clusters tracking coordinate
1201   //Float_t yclu1 = cl->GetY();
1202   //Float_t zclu1 = cl->GetZ();
1203   if (!track->Propagate(xTrOrig+xclu1)){
1204     return 0;
1205   }
1206   AliCluster c(*cl);
1207   c.SetSigmaY2(track->GetSigmaY(layer)*track->GetSigmaY(layer));
1208   c.SetSigmaZ2(track->GetSigmaZ(layer)*track->GetSigmaZ(layer));
1209   c.SetSigmaYZ(track->GetSigmaYZ(layer));
1210
1211   // Bring the track back to detector plane in ideal geometry
1212   Int_t updated = track->UpdateMI(&c,chi2,index);
1213   if (!track->Propagate(xTrOrig)) {
1214     return 0;
1215   }
1216   if(!updated){
1217     AliDebug(2,"update failed");
1218   }
1219   return updated;
1220 }
1221 //____________________________________________________________________-
1222 Int_t AliITStrackerUpgrade::CorrectForLayerMaterial(AliITStrackU *t,
1223                                                     Int_t layerindex,
1224                                                     Double_t oldGlobXYZ[3],
1225                                                     TString direction) {
1226   //-------------------------------------------------------------------
1227   // Propagate beyond layer and correct for material
1228   // (material budget in different ways according to fUseTGeo value)
1229   // Add time if going outward (PropagateTo or PropagateToTGeo)
1230   //-------------------------------------------------------------------
1231
1232   // Define budget mode:
1233   // 0: material from AliITSRecoParam (hard coded)
1234   // 1: material from TGeo in stepsof X cm (on the fly)
1235   //    X = AliITSRecoParam::GetStepSizeTGeo()
1236   // 2: material from lut
1237   // 3: material from TGeo in one step (same for all hypotheses)
1238   Int_t mode;
1239   switch(fUseTGeo) {
1240   case 0:
1241     mode=0;
1242     break;
1243   case 1:
1244     mode=1;
1245     break;
1246   case 2:
1247     mode=2;
1248     break;
1249   case 3:
1250     if(fTrackingPhase.Contains("Clusters2Tracks"))
1251       { mode=3; } else { mode=1; }
1252     break;
1253   case 4:
1254     if(fTrackingPhase.Contains("Clusters2Tracks"))
1255       { mode=3; } else { mode=2; }
1256     break;
1257   default:
1258     mode=0;
1259     break;
1260   }
1261   if(fTrackingPhase.Contains("Default")) {
1262     mode=0;
1263   }
1264   Float_t  dir = (direction.Contains("inward") ? 1. : -1.);
1265   //Double_t r = fSegmentation->GetRadius(layerindex);
1266   //Double_t deltar=(layerindex<2 ? 0.10*r : 0.05*r);
1267   Double_t deltar=0.05;
1268   Double_t rToGo=TMath::Sqrt(t->GetX()*t->GetX()+t->GetY()*t->GetY())-deltar*dir;
1269   Double_t xToGo;
1270   if (!t->GetLocalXat(rToGo,xToGo)) {
1271     return 0;
1272   }
1273   Int_t index=fNLayers*fCurrentEsdTrack+layerindex;
1274
1275   Double_t xOverX0=0.0,x0=0.0,lengthTimesMeanDensity=0.0;
1276   Int_t nsteps=1;
1277   // back before material (no correction)
1278   Double_t rOld,xOld;
1279   rOld=TMath::Sqrt(oldGlobXYZ[0]*oldGlobXYZ[0]+oldGlobXYZ[1]*oldGlobXYZ[1]);
1280   if (!t->GetLocalXat(rOld,xOld)) return 0;
1281   if (!t->Propagate(xOld)) return 0;
1282
1283   switch(mode) {
1284   case 1:
1285     x0=21.82;
1286     xOverX0 = fSegmentation->GetThickness(layerindex)/x0;
1287
1288     lengthTimesMeanDensity = xOverX0*x0;
1289     lengthTimesMeanDensity *= dir;
1290     // Bring the track beyond the material
1291     if (!t->PropagateTo(xToGo,xOverX0,lengthTimesMeanDensity/xOverX0)){
1292       return 0;
1293     }
1294     break;
1295   case 0:
1296     nsteps = (Int_t)(TMath::Abs(xOld-xToGo)/AliITSReconstructor::GetRecoParam()->GetStepSizeTGeo())+1;
1297     if (!t->PropagateToTGeo(xToGo,nsteps)) return 0; // cross the material and apply correction
1298     break;
1299   case 2:
1300     if(fxOverX0Layer[layerindex]<0) BuildMaterialLUT("Layers");
1301     xOverX0 = fxOverX0Layer[layerindex];
1302     lengthTimesMeanDensity = fxTimesRhoLayer[layerindex];
1303     lengthTimesMeanDensity *= dir;
1304     // Bring the track beyond the material
1305     if (!t->PropagateTo(xToGo,xOverX0,lengthTimesMeanDensity/xOverX0)) return 0;
1306     break;
1307   case 3:
1308     if(!fxOverX0LayerTrks || index<0 || index>=fNLayers*fNtracks) Error("CorrectForLayerMaterial","Incorrect usage of UseTGeo option!\n");
1309     if(fxOverX0LayerTrks[index]<0) {
1310       nsteps = (Int_t)(TMath::Abs(xOld-xToGo)/AliITSReconstructor::GetRecoParam()->GetStepSizeTGeo())+1;
1311       if (!t->PropagateToTGeo(xToGo,nsteps,xOverX0,lengthTimesMeanDensity)) return 0;
1312       Double_t angle=TMath::Sqrt((1.+t->GetTgl()*t->GetTgl())/
1313                                  ((1.-t->GetSnp())*(1.+t->GetSnp())));
1314       fxOverX0LayerTrks[index] = TMath::Abs(xOverX0)/angle;
1315       fxTimesRhoLayerTrks[index] = TMath::Abs(lengthTimesMeanDensity)/angle;
1316       return 1;
1317     }
1318     xOverX0 = fxOverX0LayerTrks[index];
1319     lengthTimesMeanDensity = fxTimesRhoLayerTrks[index];
1320     lengthTimesMeanDensity *= dir;
1321     // Bring the track beyond the material
1322     if (!t->PropagateTo(xToGo,xOverX0,lengthTimesMeanDensity/xOverX0)){
1323       return 0;
1324     }
1325     break;
1326   }
1327
1328
1329   return 1;
1330 }
1331
1332
1333 //_____________________________________________________________________________
1334 Double_t AliITStrackerUpgrade::GetPredictedChi2MI(AliITStrackU* track, const AliITSRecPointU *cluster,Int_t layer)
1335 {
1336   //
1337   // Compute predicted chi2
1338   //
1339   Float_t erry,errz,covyz;
1340   Float_t theta = track->GetTgl();
1341   Float_t phi   = track->GetSnp();
1342   phi = TMath::Abs(phi)*TMath::Sqrt(1./((1.-phi)*(1.+phi)));
1343   GetError(layer,cluster,theta,phi,track->GetExpQ(),erry,errz,covyz);
1344   AliDebug(3,Form(" chi2: tr-cl   %f  %f   tr X %f cl X %f",track->GetY()-cluster->GetY(),track->GetZ()-cluster->GetZ(),track->GetX(),cluster->GetX()));
1345   // Take into account the mis-alignment (bring track to cluster plane)
1346   Double_t xTrOrig=track->GetX();
1347   if (!track->Propagate(xTrOrig+cluster->GetX())) return 1000.;
1348   AliDebug(3,Form(" chi2: tr-cl   %f  %f   tr X %f cl X %f",track->GetY()-cluster->GetY(),track->GetZ()-cluster->GetZ(),track->GetX(),cluster->GetX()));
1349   Double_t chi2 = track->GetPredictedChi2MI(cluster->GetY(),cluster->GetZ(),erry,errz,covyz);
1350   // Bring the track back to detector plane in ideal geometry
1351   // [mis-alignment will be accounted for in UpdateMI()]
1352   if (!track->Propagate(xTrOrig)) return 1000.;
1353   Float_t ny=0.,nz=0.;
1354   //GetNTeor(layer,cluster,theta,phi,ny,nz);
1355   Double_t delta = cluster->GetNy()+cluster->GetNz()-nz-ny;
1356   if (delta>1){
1357     chi2+=0.5*TMath::Min(delta/2,2.);
1358     chi2+=2.*cluster->GetDeltaProbability();
1359   }
1360   //
1361   track->SetNy(layer,ny);
1362   track->SetNz(layer,nz);
1363   track->SetSigmaY(layer,erry);
1364   track->SetSigmaZ(layer, errz);
1365   track->SetSigmaYZ(layer,covyz);
1366
1367   track->SetNormQ(layer,cluster->GetQ()/TMath::Sqrt((1.+ track->GetTgl()*track->GetTgl())/((1.-track->GetSnp())*(1.+track->GetSnp()))));
1368   return chi2;
1369 }
1370 //________________________________________________________________
1371 Int_t AliITStrackerUpgrade::GetError(Int_t /*layer*/,
1372                                      const AliITSRecPointU *cl,
1373                                      Float_t /*tgl*/,Float_t /*tgphitr*/,Float_t /*expQ*/,
1374                                      Float_t &erry,Float_t &errz,Float_t &covyz,
1375                                      Bool_t /*addMisalErr*/)
1376 {
1377   //
1378   // Calculate cluster position error for the upgrade
1379   //
1380   Int_t retval=0;
1381   covyz=0.;
1382   retval = GetErrorOrigRecPoint(cl,erry,errz,covyz);
1383
1384
1385
1386   return retval;
1387
1388 }
1389 //____________________________________________________________________-
1390
1391 Int_t AliITStrackerUpgrade::GetErrorOrigRecPoint(const AliITSRecPointU *cl,
1392                                                  Float_t &erry,Float_t &errz,Float_t &covyz)
1393 {
1394   //
1395   // Calculate cluster position error (just take error from AliITSRecPoint)
1396   //
1397   erry   = TMath::Sqrt(cl->GetSigmaY2());
1398   errz   = TMath::Sqrt(cl->GetSigmaZ2());
1399   covyz  = cl->GetSigmaYZ();
1400   return 1;
1401 }
1402 //__________________________
1403 //void AliITStrackerUpgrade::GetNTeor(Int_t layer,const AliITSRecPointU* /*cl*/,
1404 /*                                  Float_t tgl,Float_t tgphitr,
1405                                     Float_t &ny,Float_t &nz)
1406 {
1407   //
1408   // Get "mean shape" (original parametrization from AliITStrackerMI)
1409   //
1410   tgl = TMath::Abs(tgl);
1411   tgphitr = TMath::Abs(tgphitr);
1412
1413   // SPD
1414   if (layer==0) {
1415     ny = 1.+tgphitr*3.2;
1416     nz = 1.+tgl*0.34;
1417     return;
1418   }
1419   if (layer==1) {
1420     ny = 1.+tgphitr*3.2;
1421     nz = 1.+tgl*0.28;
1422     return;
1423   }
1424   // SSD
1425   if (layer==4 || layer==5) {
1426     ny = 2.02+tgphitr*1.95;
1427     nz = 2.02+tgphitr*2.35;
1428     return;
1429   }
1430   // SDD
1431   ny  = 6.6-2.7*tgphitr;
1432   nz  = 2.8-3.11*tgphitr+0.45*tgl;
1433   return;
1434   }*/
1435
1436 //_________________________________________________________________
1437 Int_t AliITStrackerUpgrade::PropagateBack(AliESDEvent *event) {
1438   //--------------------------------------------------------------------
1439   // This functions propagates reconstructed ITS tracks back
1440   // The clusters must be loaded !
1441   //--------------------------------------------------------------------
1442   fTrackingPhase="PropagateBack";
1443   Int_t nentr=event->GetNumberOfTracks();
1444   Info("PropagateBack", "Number of ESD tracks: %d\n", nentr);
1445   Int_t ntrk=0;
1446   for (Int_t i=0; i<nentr; i++) {
1447     AliESDtrack *esd=event->GetTrack(i);
1448
1449     if ((esd->GetStatus()&AliESDtrack::kITSin)==0) continue;
1450     if (esd->GetStatus()&AliESDtrack::kITSout) continue;
1451
1452     /*
1453       AliITStrackMI *t=0;
1454       try {
1455       t=new AliITStrackMI(*esd);
1456       } catch (const Char_t *msg) {
1457       //Warning("PropagateBack",msg);
1458       delete t;
1459       continue;
1460       }
1461     */
1462     AliITStrackU *t = new AliITStrackU(*esd);
1463     t->SetExpQ(TMath::Max(0.8*t->GetESDtrack()->GetTPCsignal(),30.));
1464
1465     ResetTrackToFollow(*t);
1466
1467     /*
1468     // propagate to vertex [SR, GSI 17.02.2003]
1469     // Start Time measurement [SR, GSI 17.02.2003], corrected by I.Belikov
1470     if (CorrectForPipeMaterial(&fTrackToFollow,"inward")) {
1471     if (fTrackToFollow.PropagateToVertex(event->GetVertex()))
1472     fTrackToFollow.StartTimeIntegral();
1473     // from vertex to outside pipe
1474     CorrectForPipeMaterial(&fTrackToFollow,"outward");
1475     }*/
1476     // Start time integral and add distance from current position to vertex
1477     Double_t xyzTrk[3],xyzVtx[3]={GetX(),GetY(),GetZ()};
1478     fTrackToFollow.GetXYZ(xyzTrk);
1479     Double_t dst2 = 0.;
1480     for (Int_t icoord=0; icoord<3; icoord++) {
1481       Double_t di = xyzTrk[icoord] - xyzVtx[icoord];
1482       dst2 += di*di;
1483     }
1484     fTrackToFollow.StartTimeIntegral();
1485     fTrackToFollow.AddTimeStep(TMath::Sqrt(dst2));
1486
1487     fTrackToFollow.ResetCovariance(10.);
1488     fTrackToFollow.ResetClusters();
1489     //
1490     Int_t inx[fNLayers];
1491     for (Int_t k=0; k<fNLayers; k++) inx[k]=-1;
1492     Int_t nclusters = t->GetNumberOfClusters();
1493     for(Int_t ncl=0;ncl<nclusters;ncl++){
1494       Int_t index = t-> GetClIndex(ncl);
1495       Int_t lay = (index & 0xf0000000) >> 28;
1496       inx[lay]=index;
1497     }
1498     //
1499     if (RefitAtBase(fSegmentation->GetRadius(fNLayers-1),&fTrackToFollow,inx)) {
1500       //fTrackToFollow.SetLabel(t->GetLabel());//
1501       //fTrackToFollow.CookdEdx();
1502       //CookLabel(&fTrackToFollow,0.); //For comparison only
1503       fTrackToFollow.UpdateESDtrack(AliESDtrack::kITSout);
1504       //UseClusters(&fTrackToFollow);
1505       ntrk++;
1506     }
1507     delete t;
1508   }
1509
1510   fTrackingPhase="Default";
1511
1512   return 0;
1513 }
1514 //_________________________________________________________________________
1515 AliCluster *AliITStrackerUpgrade::GetCluster(Int_t index) const {
1516   //--------------------------------------------------------------------
1517   //       Return pointer to a given cluster
1518   //--------------------------------------------------------------------
1519   Int_t l=(index & 0xf0000000) >> 28;
1520   Int_t c=(index & 0x0fffffff) >> 0;
1521
1522   AliCluster *cl = fLayers[l]->GetCluster(c);
1523
1524   //  AliDebug(2,Form("index %i; cluster index %i; layer %i; Pointer to cluster:%p", index,c,l,cl));
1525
1526   return cl;
1527 }
1528 //______________________________________________________________________________
1529 Int_t AliITStrackerUpgrade::CorrectForPipeMaterial(AliITStrackU *t, TString direction) {
1530   //-------------------------------------------------------------------
1531   // Propagate beyond beam pipe and correct for material
1532   // (material budget in different ways according to fUseTGeo value)
1533   // Add time if going outward (PropagateTo or PropagateToTGeo)
1534   //-------------------------------------------------------------------
1535
1536   // Define budget mode:
1537   // 0: material from AliITSRecoParam (hard coded)
1538   // 1: material from TGeo in one step (on the fly)
1539   // 2: material from lut
1540   // 3: material from TGeo in one step (same for all hypotheses)
1541   Int_t mode;
1542   switch(fUseTGeo) {
1543   case 0:
1544     mode=0;
1545     break;
1546   case 1:
1547     mode=1;
1548     break;
1549   case 2:
1550     mode=2;
1551     break;
1552   case 3:
1553     if(fTrackingPhase.Contains("Clusters2Tracks"))
1554       { mode=3; } else { mode=1; }
1555     break;
1556   case 4:
1557     if(fTrackingPhase.Contains("Clusters2Tracks"))
1558       { mode=3; } else { mode=2; }
1559     break;
1560   default:
1561     mode=0;
1562     break;
1563   }
1564   if(fTrackingPhase.Contains("Default")) mode=0;
1565   Int_t index=fCurrentEsdTrack;
1566
1567   Float_t  dir = (direction.Contains("inward") ? 1. : -1.);
1568   Double_t rToGo=(dir>0 ? AliITSRecoParam::GetrInsidePipe() : AliITSRecoParam::GetrOutsidePipe());
1569   Double_t xToGo;
1570   if (!t->GetLocalXat(rToGo,xToGo)) return 0;
1571
1572   Double_t xOverX0,x0,lengthTimesMeanDensity;
1573
1574   switch(mode) {
1575   case 0:
1576     xOverX0 = AliITSRecoParam::GetdPipe();
1577     x0 = AliITSRecoParam::GetX0Be();
1578     lengthTimesMeanDensity = xOverX0*x0;
1579     lengthTimesMeanDensity *= dir;
1580     if (!t->PropagateTo(xToGo,xOverX0,lengthTimesMeanDensity/xOverX0)) return 0;
1581     break;
1582   case 1:
1583     if (!t->PropagateToTGeo(xToGo,1)) return 0;
1584     break;
1585   case 2:
1586     if(fxOverX0Pipe<0) BuildMaterialLUT("Pipe");
1587     xOverX0 = fxOverX0Pipe;
1588     lengthTimesMeanDensity = fxTimesRhoPipe;
1589     lengthTimesMeanDensity *= dir;
1590     if (!t->PropagateTo(xToGo,xOverX0,lengthTimesMeanDensity/xOverX0)) return 0;
1591     break;
1592   case 3:
1593     if(!fxOverX0PipeTrks || index<0 || index>=fNtracks) Error("CorrectForPipeMaterial","Incorrect usage of UseTGeo option!\n");
1594     if(fxOverX0PipeTrks[index]<0) {
1595       if (!t->PropagateToTGeo(xToGo,1,xOverX0,lengthTimesMeanDensity)) return 0;
1596       Double_t angle=TMath::Sqrt((1.+t->GetTgl()*t->GetTgl())/
1597                                  ((1.-t->GetSnp())*(1.+t->GetSnp())));
1598       fxOverX0PipeTrks[index] = TMath::Abs(xOverX0)/angle;
1599       fxTimesRhoPipeTrks[index] = TMath::Abs(lengthTimesMeanDensity)/angle;
1600       return 1;
1601     }
1602     xOverX0 = fxOverX0PipeTrks[index];
1603     lengthTimesMeanDensity = fxTimesRhoPipeTrks[index];
1604     lengthTimesMeanDensity *= dir;
1605     if (!t->PropagateTo(xToGo,xOverX0,lengthTimesMeanDensity/xOverX0)) return 0;
1606     break;
1607   }
1608
1609   return 1;
1610 }
1611 //__________________________________________________________________________
1612 Int_t AliITStrackerUpgrade::RefitInward(AliESDEvent *event) {
1613   //--------------------------------------------------------------------
1614   // This functions refits ITS tracks using the
1615   // "inward propagated" TPC tracks
1616   // The clusters must be loaded !
1617   //--------------------------------------------------------------------
1618   fTrackingPhase="RefitInward";
1619   Int_t nentr=event->GetNumberOfTracks();
1620   for (Int_t i=0; i<nentr; i++) {
1621     AliESDtrack *esd=event->GetTrack(i);
1622
1623     // if ((esd->GetStatus()&AliESDtrack::kITSout) == 0) continue;
1624     // if (esd->GetStatus()&AliESDtrack::kITSrefit) continue;
1625     //if (esd->GetStatus()&AliESDtrack::kTPCout)
1626     //  if ((esd->GetStatus()&AliESDtrack::kTPCrefit)==0) continue;
1627     AliITStrackU *t=0;
1628     try {
1629       t=new AliITStrackU(*esd);
1630     } catch (const Char_t *msg) {
1631       //Warning("RefitInward",msg);
1632       delete t;
1633       continue;
1634     }
1635
1636     ResetTrackToFollow(*t);
1637     // fTrackToFollow.ResetClusters();
1638     //  if ((esd->GetStatus()&AliESDtrack::kTPCin)==0)
1639     //  fTrackToFollow.ResetCovariance(10.);
1640     //Refitting...
1641     //The beam pipe
1642     if (CorrectForPipeMaterial(&fTrackToFollow,"inward")) {
1643       fTrackToFollow.UpdateESDtrack(AliESDtrack::kITSrefit);
1644       AliESDtrack  *esdTrack =fTrackToFollow.GetESDtrack();
1645       Double_t r[3]={0.,0.,0.};
1646       Double_t maxD=3.;
1647       esdTrack->RelateToVertex(event->GetVertex(),GetBz(r),maxD);
1648     }
1649     delete t;
1650   }
1651
1652   fTrackingPhase="Default";
1653   return 0;
1654 }
1655
1656
1657