HMPID/AliHMPIDTracker.cxx

   1 #include "AliHMPIDTracker.h"     //class header
   2 #include "AliHMPIDtrack.h"       //class header
   3 #include "AliHMPIDCluster.h"     //GetTrackPoint(),PropagateBack()
   4 #include "AliHMPIDParam.h"       //GetTrackPoint(),PropagateBack()
   5 #include "AliHMPIDPid.h"         //Recon(),reconHTA()
   6 #include "AliHMPIDRecon.h"       //Recon()
   7 #include "AliHMPIDRecoParamV1.h"   //Recon()
   8 #include "AliHMPIDReconstructor.h"//Recon()
   9 #include "AliHMPIDReconHTA.h"    //ReconHTA()
  10 #include <AliLog.h>              //Recon()
  11 #include <AliESDEvent.h>         //PropagateBack(),Recon()
  12 #include <AliESDtrack.h>         //Intersect()
  13 #include <AliTracker.h>
  14 #include <AliRun.h>              //GetTrackPoint(),PropagateBack()
  15 #include <AliTrackPointArray.h>  //GetTrackPoint()
  16 #include <AliAlignObj.h>         //GetTrackPoint()
  17 #include <AliCDBManager.h>       //PropageteBack()
  18 #include <AliCDBEntry.h>         //PropageteBack()
  19 #include "TTreeStream.h"         // debug streamer
  20 //
  21 // HMPID base class fo tracking
  22 //.
  23 //.
  24 //.
  25 ClassImp(AliHMPIDTracker)
  26 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  27 AliHMPIDTracker::AliHMPIDTracker():
  28   AliTracker(),
  29   fClu(new TObjArray(AliHMPIDParam::kMaxCh+1)),
  30   fDebugStreamer(0)
  31 {
  32 // ctor. Create TObjArray of TClonesArray of AliHMPIDCluster
  33 //
  34 //
  35   fClu->SetOwner(kTRUE);
  36   for(int i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++) fClu->AddAt(new TClonesArray("AliHMPIDCluster"),i);
  37   fDebugStreamer = new TTreeSRedirector("HMPIDdebug.root");
  38
  39 }//ctor
  40
  41
  42 AliHMPIDTracker::~AliHMPIDTracker(){
  43   //
  44   // destructor
  45   //
  46   delete fClu;
  47   if (fDebugStreamer) delete fDebugStreamer;
  48 }
  49
  50 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  51 Bool_t AliHMPIDTracker::GetTrackPoint(Int_t idx, AliTrackPoint& point) const
  52 {
  53 // Interface callback methode invoked from AliReconstruction::WriteAlignmentData() to get position of MIP cluster in MARS associated to a current track.
  54 // MIP cluster is reffered by index which is stored in AliESDtrack  ???????
  55 // Arguments: idx- cluster index which is stored by HMPID in AliESDtrack
  56 //            point- reference to the object where to store the point
  57 //   Returns: status of operation  if FALSE then AliReconstruction::WriteAlignmentData() do not store this point to array of points for current track.
  58   if(idx<0) return kFALSE; //no MIP cluster assigned to this track in PropagateBack()
  59   Int_t iCham=idx/1000000; Int_t iClu=idx%1000000;
  60   iClu = iClu%1000; //GetHMPIDcluIdx -> 1e+6*ch + 1e+3*clusize + cluIdx;
  61   point.SetVolumeID(AliGeomManager::LayerToVolUID(AliGeomManager::kHMPID,iCham));//layer and chamber number
  62   TClonesArray *pArr=(TClonesArray*)(*fClu)[iCham];
  63   AliHMPIDCluster *pClu=(AliHMPIDCluster*)pArr->UncheckedAt(iClu);//get pointer to cluster
  64   Float_t xyz[3];
  65   pClu->GetGlobalXYZ(xyz);
  66   Float_t cov[6];
  67   pClu->GetGlobalCov(cov);
  68   point.SetXYZ(xyz,cov);
  69   return kTRUE;
  70 }//GetTrackPoint()
  71 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  72 Int_t AliHMPIDTracker::IntTrkCha(AliESDtrack *pTrk,Float_t &xPc,Float_t &yPc,Float_t &xRa,Float_t &yRa,Float_t &theta,Float_t &phi)
  73 {
  74 // Static method to find intersection in between given track and HMPID chambers
  75 // Arguments: pTrk- ESD track; xPc,yPc- track intersection with PC in LORS [cm]
  76 //   Returns: intersected chamber ID or -1
  77   AliHMPIDtrack *hmpTrk = new AliHMPIDtrack(*pTrk);                                             //create a hmpid track to be used for propagation and matching
  78   for(Int_t i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++){                              //chambers loop
  79     Int_t chInt = IntTrkCha(i,hmpTrk,xPc,yPc,xRa,yRa,theta,phi);
  80     if(chInt>=0) {delete hmpTrk;hmpTrk=0x0;return chInt;}
  81   }                                                                                             //chambers loop
  82   delete hmpTrk; hmpTrk=0x0;
  83   return -1;                                                                                    //no intersection with HMPID chambers
  84 }//IntTrkCha()
  85 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  86 Int_t AliHMPIDTracker::IntTrkCha(Int_t ch,AliHMPIDtrack *pTrk,Float_t &xPc,Float_t &yPc,Float_t &xRa,Float_t &yRa,Float_t &theta,Float_t &phi)
  87 {
  88 // Static method to find intersection in between given track and HMPID chambers
  89 // Arguments: pTrk- HMPID track; xPc,yPc- track intersection with PC in LORS [cm]
  90 //   Returns: intersected chamber ID or -1
  91     AliHMPIDParam *pParam=AliHMPIDParam::Instance();
  92     Double_t p1[3],n1[3];
  93     pParam->Norm(ch,n1);
  94     pParam->Point(ch,p1,AliHMPIDParam::kRad);                                                    //point & norm  for middle of radiator plane
  95     Double_t p2[3],n2[3];
  96     pParam->Norm(ch,n2);
  97     pParam->Point(ch,p2,AliHMPIDParam::kPc);                                                     //point & norm  for entrance to PC plane
  98     if(pTrk->Intersect(p1,n1)==kFALSE) return -1;                                                //try to intersect track with the middle of radiator
  99     if(pTrk->Intersect(p2,n2)==kFALSE) return -1;
 100     pParam->Mars2LorsVec(ch,n1,theta,phi);                                                       //track angles at RAD
 101     pParam->Mars2Lors   (ch,p1,xRa,yRa);                                                         //TRKxRAD position
 102     pParam->Mars2Lors   (ch,p2,xPc,yPc);                                                         //TRKxPC position
 103     if(AliHMPIDParam::IsInside(xPc,yPc,pParam->DistCut())==kTRUE) return ch;                     //return intersected chamber
 104   return -1;                                                                                     //no intersection with HMPID chambers
 105 }//IntTrkCha()
 106 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 107 Int_t AliHMPIDTracker::LoadClusters(TTree *pCluTree)
 108 {
 109 // Interface callback methode invoked from AliReconstruction::RunTracking() to load HMPID clusters before PropagateBack() gets control. Done once per event.
 110 // Arguments: pCluTree- pointer to clusters tree got by AliHMPIDLoader::LoadRecPoints("read") then AliHMPIDLoader::TreeR()
 111 //   Returns: error code (currently ignored in AliReconstruction::RunTraking())
 112   for(int i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++) pCluTree->SetBranchAddress(Form("HMPID%d",i),&((*fClu)[i]));
 113   pCluTree->GetEntry(0);
 114   return 0;
 115 }//LoadClusters()
 116 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 117 Int_t AliHMPIDTracker::PropagateBack(AliESDEvent *pEsd)
 118 {
 119 // Interface pure virtual in AliTracker. Invoked from AliReconstruction::RunTracking() after invocation of AliTracker::LoadClusters() once per event
 120 // Agruments: pEsd - pointer to ESD
 121 //   Returns: error code
 122   AliCDBEntry *pNmeanEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Nmean"); //contains TObjArray of 42 TF1 + 1 EPhotMean
 123   AliCDBEntry *pQthreEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Qthre"); //contains TObjArray of 42 (7ch * 6sec) TF1
 124   if(!pNmeanEnt) AliError("No Nmean C6F14 ");
 125   if(!pQthreEnt) AliError("No Qthre");
 126
 127   return Recon(pEsd,fClu,(TObjArray*)pNmeanEnt->GetObject(),(TObjArray*)pQthreEnt->GetObject());
 128 }//PropagateBack()
 129 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 130 Int_t AliHMPIDTracker::Recon(AliESDEvent *pEsd,TObjArray *pClus,TObjArray *pNmean, TObjArray *pQthre)
 131 {
 132 // Static method to reconstruct the Cherenkov angle for all valid tracks of a given event.
 133 // Arguments: pEsd- pointer ESD; pClu- pointer to clusters for all chambers; pNmean - pointer to all function Nmean=f(time)
 134 // Returns: error code, 0 if no errors
 135 //
 136 // Algortihm: Loop over tracks
 137 //
 138 // 1. Find the closest MIP cluster using fast tracks extrapolation method
 139 // 2. Propagate track to the MIP cluster using the STEER method
 140 // 3. Update the track information with MIP cluster (Improved angular and position resolution - to be used for Cherenkov angle calculation)
 141 // 4. Propagate back the constrained track to the radiator radius ( not exact yet)
 142 // 5. Propagation in the last 10 cm with the fast method
 143 // 6. Set ESDtrack information
 144 // 7. Calculate the Cherenkov angle
 145
 146   const Double_t kMaxSnp=0.9;   //maximal snp for prolongation
 147   const Double_t kdRadiator=10; // distance between radiator and the plane
 148   AliHMPIDRecon recon;                                                                           //instance of reconstruction class, nothing important in ctor
 149   AliHMPIDParam *pParam = AliHMPIDParam::Instance();                                             //Instance of AliHMPIDParam
 150   Float_t xPc,yPc,xRa,yRa,theta,phi;
 151
 152   Double_t cluLORS[2]={0};
 153   Int_t nMipClusTot=0;
 154
 155   Double_t qthre = 0;   Double_t nmean=0; Int_t hvsec=0;
 156   Int_t nClusCh[AliHMPIDParam::kMaxCh+1];
 157
 158   Bool_t tsRight = kTRUE;
 159
 160   UInt_t tsmin = (UInt_t)((TF1*)pQthre->At(0))->GetXmin();                                        //
 161   UInt_t tsmax = (UInt_t)((TF1*)pQthre->At(0))->GetXmax();                                        //
 162   UInt_t ts = pEsd->GetTimeStamp();
 163
 164   if(ts<tsmin || ts>tsmax) {
 165     AliWarning(Form(" in HMPID time stamp out of range!!! Please check!!! ts = %i",ts));
 166     tsRight = kFALSE;
 167   }
 168
 169   for(Int_t iTrk=0;iTrk<pEsd->GetNumberOfTracks();iTrk++){                                        //loop on the ESD tracks in the event
 170
 171     //    Double_t bestChi2=99999;chi2=99999;                                                     //init. track matching params
 172     Double_t dmin=999999,bz=0,distCut=1,distParams[5]={1};
 173
 174     Bool_t isOkDcut=kFALSE;
 175     Bool_t isOkQcut=kFALSE;
 176     Bool_t isMatched=kFALSE;
 177
 178     AliHMPIDCluster *bestHmpCluster=0x0;                                                          //the best matching cluster
 179     AliESDtrack *pTrk = pEsd->GetTrack(iTrk);                                                     //get reconstructed track
 180
 181     if(!pTrk->IsOn(AliESDtrack::kTPCout)) continue;
 182
 183     if(pTrk->IsOn(AliESDtrack::kTPCrefit)) continue;
 184     AliESDfriendTrack *ftrack= (AliESDfriendTrack *)pTrk->GetFriendTrack();
 185     if (!ftrack) continue;
 186     if (!ftrack->GetTPCOut()) continue;
 187     AliHMPIDtrack *hmpTrk = new AliHMPIDtrack(*pTrk);                                             //create a hmpid track to be used for propagation and matching
 188     AliHMPIDtrack *hmpTrkConstrained = 0;                                                         //create a hmpid track to be used for propagation and matching
 189     hmpTrk->Set(ftrack->GetTPCOut()->GetX(), ftrack->GetTPCOut()->GetAlpha(),ftrack->GetTPCOut()->GetParameter(), ftrack->GetTPCOut()->GetCovariance());
 190     //
 191     bz=AliTracker::GetBz();
 192
 193     //initial flags for HMPID ESD infos
 194     pTrk->SetHMPIDtrk(0,0,0,0);                                                                //no intersection found
 195     pTrk->SetHMPIDmip(0,0,0,0);                                                                //store mip info in any case
 196     pTrk->SetHMPIDcluIdx(99,99999);                                                            //chamber not found, mip not yet considered
 197     pTrk->SetHMPIDsignal(AliHMPIDRecon::kNotPerformed);                                        //ring reconstruction not yet performed
 198
 199     Int_t ipCh=IntTrkCha(pTrk,xPc,yPc,xRa,yRa,theta,phi);                                        //find the intersected chamber for this track
 200     if(ipCh<0) {delete hmpTrk;hmpTrk=0x0;continue;}                                                                         //no intersection at all, go after next track
 201
 202     pTrk->SetHMPIDtrk(xPc,yPc,theta,phi);                                                        //store initial infos
 203     pTrk->SetHMPIDcluIdx(ipCh,9999);                                                             //set chamber, index of cluster + cluster size
 204
 205     // track intersects the chamber ipCh: find the MIP
 206
 207     TClonesArray *pMipCluLst=(TClonesArray *)pClus->At(ipCh);                                   //get the list of clusters
 208     nMipClusTot = pMipCluLst->GetEntries();                                                     //total number of clusters in the given chamber
 209     nClusCh[ipCh] = nMipClusTot;
 210
 211     if(nMipClusTot==0) {delete hmpTrk;hmpTrk=0x0;continue;}
 212
 213     Int_t index=-1;                                                                               //index of the "best" matching cluster
 214     //
 215     // 1. Find the closest MIP cluster using fast tracks extrapolation method
 216     //
 217     for (Int_t iClu=0; iClu<nMipClusTot;iClu++) {                                                 //clusters loop
 218
 219       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pMipCluLst->UncheckedAt(iClu);                      //get the cluster
 220       // evaluate qThre
 221       if(tsRight){
 222         if(pQthre->GetEntriesFast()==pParam->kMaxCh+1) {
 223           qthre=((TF1*)pQthre->At(pClu->Ch()))->Eval(ts);                                          //
 224         } else {                                                                                   // in the past just 1 qthre
 225           hvsec = pParam->InHVSector(pClu->Y());                                                   //  per chamber
 226           if(hvsec>=0) qthre=((TF1*)pQthre->At(6*ipCh+hvsec))->Eval(ts);                                     //
 227         }
 228       } else qthre = pParam->QCut();
 229
 230       //
 231       if(pClu->Q()<qthre) continue;                                                                      //charge compartible with MIP clusters
 232       isOkQcut = kTRUE;
 233       //
 234       cluLORS[0]=pClu->X(); cluLORS[1]=pClu->Y();                                                        //get the LORS coordinates of the cluster
 235       Double_t dist = TMath::Sqrt((xPc-cluLORS[0])*(xPc-cluLORS[0])+(yPc-cluLORS[1])*(yPc-cluLORS[1]));
 236
 237       if(dist<dmin) {
 238         dmin = dist;
 239         index=iClu;
 240         bestHmpCluster=pClu;
 241       }
 242     } // clusters loop
 243
 244     // moved down
 245     /*if(!isOkQcut) {
 246       pTrk->SetHMPIDsignal(pParam->kMipQdcCut);
 247       delete hmpTrk;hmpTrk=0x0; continue;
 248     }*/
 249
 250     //
 251     // 2. Propagate track to the MIP cluster using the STEER method
 252     //
 253
 254     if(!bestHmpCluster) {delete hmpTrk;hmpTrk=0x0; delete hmpTrkConstrained;hmpTrkConstrained=0x0;  continue;}
 255
 256     TVector3 vG = pParam->Lors2Mars(ipCh,bestHmpCluster->X(),bestHmpCluster->Y());
 257     Double_t gx = vG[0];
 258     Double_t gy = vG[1];
 259     Double_t gz = vG[2];
 260     Double_t alpha=TMath::ATan2(gy,gx);
 261     Double_t radiusH=TMath::Sqrt(gy*gy+gx*gx);
 262     if (!(hmpTrk->Rotate(alpha,kTRUE))) continue;
 263     if(!AliTrackerBase::PropagateTrackToBxByBz(hmpTrk,radiusH,pTrk->GetMass(),1,kFALSE,kMaxSnp,-1)) {delete hmpTrk;hmpTrk=0x0; delete hmpTrkConstrained;hmpTrkConstrained=0x0; continue;}
 264     //
 265     // 3. Update the track with MIP cluster (Improved angular and position resolution - to be used for Cherenkov angle calculation)
 266     //
 267     AliExternalTrackParam trackC(*hmpTrk);
 268     Double_t posC[2]={0,gz};
 269     Double_t covC[3]={0.1*0.1, 0, 0.1*0.1};
 270     trackC.Update(posC,covC);
 271     //
 272     // 4. Propagate back the constrained track to the radiator radius ( not exact yet)
 273     //
 274     hmpTrkConstrained = new AliHMPIDtrack(*pTrk);
 275     hmpTrkConstrained->Set(trackC.GetX(), trackC.GetAlpha(),trackC.GetParameter(), trackC.GetCovariance());
 276     if(!AliTrackerBase::PropagateTrackToBxByBz(hmpTrkConstrained,radiusH-kdRadiator,pTrk->GetMass(),1,kFALSE,kMaxSnp,1)) {delete hmpTrk;hmpTrk=0x0; delete hmpTrkConstrained;hmpTrkConstrained=0x0;continue;}
 277     //
 278     // 5. Propagation in the last 10 cm with the fast method
 279     //
 280     Float_t xPc0=0, yPc0=0;
 281
 282     IntTrkCha(ipCh, hmpTrk, xPc0,yPc0,xRa,yRa,theta,phi);
 283     IntTrkCha(ipCh, hmpTrkConstrained, xPc,yPc,xRa,yRa,theta,phi);
 284     //
 285     // 6. Set ESDtrack information
 286     //
 287     Int_t cluSiz = bestHmpCluster->Size();
 288     pTrk->SetHMPIDmip(bestHmpCluster->X(),bestHmpCluster->Y(),(Int_t)bestHmpCluster->Q(),0);  //store mip info in any case
 289     pTrk->SetHMPIDcluIdx(ipCh,index+1000*cluSiz);                                             //set chamber, index of cluster + cluster size
 290     pTrk->SetHMPIDtrk(xPc0,yPc0,theta,phi);
 291     //
 292     //
 293     // Dump debug info if specified
 294     //
 295     if (AliHMPIDReconstructor::StreamLevel()>0) {
 296       AliExternalTrackParam * trackTPC=new AliExternalTrackParam(*(ftrack->GetTPCOut()));
 297       AliExternalTrackParam * trackCurrent=new AliExternalTrackParam(*pTrk);
 298       if(!trackTPC->Rotate(alpha)) continue;
 299       if(!trackCurrent->Rotate(alpha)) continue;
 300       Bool_t statusTPC= AliTracker::PropagateTrackToBxByBz(trackTPC,radiusH,pTrk->GetMass(),1,kFALSE,kMaxSnp,-1);
 301       Bool_t statusCurrent=AliTracker::PropagateTrackToBxByBz(trackCurrent,radiusH,pTrk->GetMass(),1,kFALSE,kMaxSnp,-1);
 302       AliExternalTrackParam * trackTPCNB=new AliExternalTrackParam(*(ftrack->GetTPCOut()));
 303       if(!trackTPCNB->Rotate(alpha)) continue;
 304       Bool_t statusTPCNB=kTRUE;
 305       Double_t bfield[3]={0,0,0};
 306       for (Double_t radius=trackTPCNB->GetX(); radius<radiusH; radius+=1){
 307         Double_t xyz[3];
 308         trackTPCNB->GetXYZ(xyz);
 309         GetBxByBz(xyz,bfield);
 310         statusTPCNB&=trackTPCNB->PropagateToBxByBz(radius,bfield);
 311       }
 312       statusTPCNB&=trackTPCNB->PropagateToBxByBz(radiusH,bfield);
 313       //
 314       Double_t tanAlpha=TMath::Tan(TMath::ASin(trackTPC->GetSnp()));
 315       Double_t deltaC= trackTPC->GetC(AliTrackerBase::GetBz())-ftrack->GetTPCOut()->GetC(AliTrackerBase::GetBz());
 316       //
 317       AliExternalTrackParam * trackTPCConstrained= new AliExternalTrackParam(*trackTPC);
 318       Double_t pos[2]={0,gz};
 319       Double_t cov[3]={0.1*0.1, 0, 0.1*0.1};
 320       Double_t chi2C =  trackTPCConstrained->GetPredictedChi2(pos,cov);
 321       trackTPCConstrained->Update(pos,cov);
 322       (*fDebugStreamer)<<"track"<<
 323         "rH="<<radiusH<<                      // radius of cluster
 324         "angle="<<tanAlpha<<                  // tan of the local inlination angle
 325         "dC="<<deltaC<<                       // delta of the curvature
 326         "trackTPC.="<<trackTPC<<              // TPC outer param extrapolated to the HMPID
 327         "trackTPCNB.="<<trackTPCNB<<          // TPC track prpagated with material budget correction
 328         "chi2C="<<chi2C<<
 329         "trackTPCC.="<<trackTPCConstrained<<  // TPC outer param extrapolated to the HMPID constrained
 330         "trackCurrent.="<<trackCurrent<<      // current track extrapolated to the HMPID
 331         "sTPC="<<statusTPC<<                  // status for the current TPC  track
 332         "sCurrent="<<statusCurrent<<          // status for the current global track
 333         "cl.="<<bestHmpCluster<<              // HMPID cluster
 334         //
 335         "t.="<<pTrk<<                        // curent esd track
 336         "ft.="<<ftrack<<                     // friend track
 337         "hmpTrk.="<<hmpTrk<<                 // hmpid tracks as used in the following code
 338         "hmpTrkC.="<<hmpTrkConstrained<<     // constrained hmpid tracks as used in the following code
 339         "gx="<<gx<<                          // global cluster position X
 340         "gy="<<gy<<                          // Y
 341         "gz="<<gz<<                          // Z
 342         "\n";
 343     }
 344     //
 345     //
 346     //
 347     if(!isOkQcut) {
 348       pTrk->SetHMPIDsignal(pParam->kMipQdcCut);
 349       delete hmpTrk;hmpTrk=0x0;
 350       delete hmpTrkConstrained;hmpTrkConstrained=0x0;
 351       continue;
 352     }
 353
 354     if(AliHMPIDReconstructor::GetRecoParam())                                                 //retrieve distance cut
 355     {
 356       if(AliHMPIDReconstructor::GetRecoParam()->IsFixedDistCut()==kTRUE)                      //distance cut is fixed number
 357       {
 358         distCut=AliHMPIDReconstructor::GetRecoParam()->GetHmpTrackMatchingDist();
 359       }
 360       else
 361       {
 362         for(Int_t ipar=0;ipar<5;ipar++) distParams[ipar]=AliHMPIDReconstructor::GetRecoParam()->GetHmpTrackMatchingDistParam(ipar);      //prevision: distance cut is function of momentum
 363         distCut=distParams[0]+distParams[1]*TMath::Power(distParams[2]*pTrk->GetP(),distParams[3]); //prevision: change functional form to be more precise
 364       }
 365     }
 366     else {distCut=pParam->DistCut();}
 367
 368     //dmin recalculated
 369
 370     dmin = TMath::Sqrt((xPc0-bestHmpCluster->X())*(xPc0-bestHmpCluster->X())+(yPc0-bestHmpCluster->Y())*(yPc0-bestHmpCluster->Y()));
 371
 372     if(dmin < distCut) {
 373       isOkDcut = kTRUE;
 374     }
 375     //isOkDcut = kTRUE; // switch OFF cut
 376
 377     if(!isOkDcut) {
 378       pTrk->SetHMPIDsignal(pParam->kMipDistCut);                                                //closest cluster with enough charge is still too far from intersection
 379     }
 380
 381     if(isOkQcut*isOkDcut) isMatched = kTRUE;                                                    // MIP-Track matched !!
 382
 383     if(!isMatched) {delete hmpTrk;hmpTrk=0x0;delete hmpTrkConstrained;hmpTrkConstrained=0x0;continue;}                                           // If matched continue...
 384
 385     Bool_t isOk = kTRUE;
 386     if(!isOk) {delete hmpTrk;hmpTrk=0x0; delete hmpTrkConstrained;hmpTrkConstrained=0x0; continue;}
 387     pTrk->SetOuterHmpParam(hmpTrkConstrained,AliESDtrack::kHMPIDout);
 388
 389     FillResiduals(hmpTrk,bestHmpCluster,kFALSE);
 390
 391     Int_t iRad = pParam->Radiator(yRa);                                                          //evaluate the radiator involved
 392
 393     //evaluate nMean
 394     if(tsRight){
 395      if(pNmean->GetEntries()==21) {                                                              //for backward compatibility
 396        nmean=((TF1*)pNmean->At(3*ipCh))->Eval(ts);                                               //C6F14 Nmean for this chamber
 397      } else {
 398        if(iRad < 0) {
 399         nmean = -1;
 400        } else {
 401        Double_t tLow  = ((TF1*)pNmean->At(6*ipCh+2*iRad  ))->Eval(ts);                           //C6F14 low  temp for this chamber
 402        Double_t tHigh = ((TF1*)pNmean->At(6*ipCh+2*iRad+1))->Eval(ts);                           //C6F14 high temp for this chamber
 403        Double_t tExp  = pParam->FindTemp(tLow,tHigh,yRa);                                        //estimated temp for that chamber at that y
 404        nmean = pParam->NIdxRad(AliHMPIDParam::Instance()->GetEPhotMean(),tExp);                  //mean ref idx @ a given temp
 405        }
 406        if(nmean < 0){                                                                            //track didn' t pass through the radiator
 407          pTrk->SetHMPIDsignal(AliHMPIDRecon::kNoRad);                                           //set the appropriate flag
 408          pTrk->SetHMPIDcluIdx(ipCh,index+1000*cluSiz);                                          //set index of cluster
 409          delete hmpTrk;hmpTrk=0x0;
 410          delete hmpTrkConstrained;hmpTrkConstrained=0x0;
 411          continue;
 412         }
 413      }
 414     } else nmean = pParam->MeanIdxRad();
 415     //
 416     // 7. Calculate the Cherenkov angle
 417     //
 418     recon.SetImpPC(xPc0,yPc0);                                                                     //store track impact to PC
 419     recon.CkovAngle(pTrk,(TClonesArray *)pClus->At(ipCh),index,nmean,xRa,yRa);                   //search for Cerenkov angle of this track
 420
 421     Double_t thetaCkov = pTrk->GetHMPIDsignal();
 422
 423     if (AliHMPIDReconstructor::StreamLevel()>0) {
 424       AliExternalTrackParam * trackTPC=new AliExternalTrackParam(*(ftrack->GetTPCOut()));
 425       AliExternalTrackParam * trackCurrent=new AliExternalTrackParam(*pTrk);
 426       if(!trackTPC->Rotate(alpha)) continue;
 427       if(!trackCurrent->Rotate(alpha)) continue;
 428       Bool_t statusTPC= AliTracker::PropagateTrackToBxByBz(trackTPC,radiusH,pTrk->GetMass(),1,kFALSE,kMaxSnp,-1);
 429       Bool_t statusCurrent=AliTracker::PropagateTrackToBxByBz(trackCurrent,radiusH,pTrk->GetMass(),1,kFALSE,kMaxSnp,-1);
 430       Double_t tanAlpha=TMath::Tan(TMath::ASin(trackTPC->GetSnp()));
 431       Double_t deltaC= trackTPC->GetC(AliTrackerBase::GetBz())-ftrack->GetTPCOut()->GetC(AliTrackerBase::GetBz());
 432       //
 433       AliExternalTrackParam * trackTPCNB=new AliExternalTrackParam(*(ftrack->GetTPCOut()));
 434       if(!trackTPCNB->Rotate(alpha)) continue;
 435       Bool_t statusTPCNB=kTRUE;
 436       Double_t bfield[3]={0,0,0};
 437       for (Double_t radius=trackTPCNB->GetX(); radius<radiusH; radius+=1){
 438         Double_t xyz[3];
 439         trackTPCNB->GetXYZ(xyz);
 440         GetBxByBz(xyz,bfield);
 441         statusTPCNB&=trackTPCNB->PropagateToBxByBz(radius,bfield);
 442       }
 443       statusTPCNB&=trackTPCNB->PropagateToBxByBz(radiusH,bfield);
 444
 445       AliExternalTrackParam * trackTPCConstrained= new AliExternalTrackParam(*trackTPC);
 446       Double_t pos[2]={0,gz};
 447       Double_t cov[3]={0.1*0.1, 0, 0.1*0.1};
 448       Double_t chi2C =  trackTPCConstrained->GetPredictedChi2(pos,cov);
 449       trackTPCConstrained->Update(pos,cov);
 450       (*fDebugStreamer)<<"track2"<<
 451         "rH="<<radiusH<<                      // radius of cluster
 452         "angle="<<tanAlpha<<                  // tan of the local inlination angle
 453         "dC="<<deltaC<<                       // delta of the curvature
 454         "trackTPC.="<<trackTPC<<              // TPC outer param extrapolated to the HMPID
 455         "trackTPCNB.="<<trackTPCNB<<          // TPC outer param extrapolated to the HMPID
 456         "chi2C="<<chi2C<<
 457         "trackTPCC.="<<trackTPCConstrained<<  // TPC outer param extrapolated to the HMPID constrained
 458         "trackCurrent.="<<trackCurrent<<      // current track extrapolated to the HMPID
 459         "sTPC="<<statusTPC<<                  // status for the current TPC  track
 460         "sCurrent="<<statusCurrent<<          // status for the current global track
 461         "cl.="<<bestHmpCluster<<              // HMPID cluster
 462         //
 463         "t.="<<pTrk<<                         // curent esd track
 464         "ft.="<<ftrack<<                      // friend track
 465         "hmpTrk.="<<hmpTrk<<                  // hmpid tracks as used in the following code
 466         "hmpTrkC.="<<hmpTrkConstrained<<      // constrained hmpid tracks as used in the following code
 467         "gx="<<gx<<                           // global cluster position X
 468         "gy="<<gy<<                           // Y
 469         "gz="<<gz<<                           // Z
 470         "thetaCkov="<<thetaCkov<<             // Cherenkov angle
 471         "\n";
 472     }
 473
 474     if(pTrk->GetHMPIDsignal()<0) {
 475       delete hmpTrk;hmpTrk=0x0;
 476       delete hmpTrkConstrained; hmpTrkConstrained=0x0;
 477       continue;}
 478
 479     AliHMPIDPid pID;
 480     Double_t prob[5];
 481     pID.FindPid(pTrk,5,prob);
 482     pTrk->SetHMPIDpid(prob);
 483 //      Printf(" Prob e- %6.2f mu %6.2f pi %6.2f k %6.2f p %6.2f",prob[0]*100,prob[1]*100,prob[2]*100,prob[3]*100,prob[4]*100);
 484     delete hmpTrk; hmpTrk=0x0;
 485     delete hmpTrkConstrained; hmpTrkConstrained=0x0;
 486   }//iTrk
 487
 488   return 0; // error code: 0=no error;
 489 }//Recon()
 490 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 491 Int_t AliHMPIDTracker::ReconHiddenTrk(AliESDEvent *pEsd,TObjArray *pClus,TObjArray *pNmean, TObjArray *pQthre)
 492 {
 493 // Static method to reconstruct Theta Ckov for all valid tracks of a given event.
 494 // Arguments: pEsd- pointer ESD; pClu- pointer to clusters for all chambers; pNmean - pointer to all function Nmean=f(time), pQthre - pointer to all function Qthre=f(time)
 495 //   Returns: error code, 0 if no errors
 496
 497   AliHMPIDReconHTA reconHTA;                                                                     //instance of reconstruction class, nothing important in ctor
 498
 499   AliHMPIDParam *pParam = AliHMPIDParam::Instance();                                             //Instance of AliHMPIDParam
 500
 501   Bool_t tsRight = kTRUE;
 502
 503   UInt_t tsmin = (UInt_t)((TF1*)pQthre->At(0))->GetXmin();                                        //
 504   UInt_t tsmax = (UInt_t)((TF1*)pQthre->At(0))->GetXmax();                                        //
 505   UInt_t ts = pEsd->GetTimeStamp();
 506
 507   if(ts<tsmin || ts>tsmax) {
 508     AliWarning(Form(" in HMPID time stamp out of range!!! Please check!!! ts = %i",ts));
 509     tsRight = kFALSE;
 510   }
 511
 512   for(Int_t iTrk=0;iTrk<pEsd->GetNumberOfTracks();iTrk++){                                        //loop on the ESD tracks in the event
 513
 514     AliESDtrack *pTrk = pEsd->GetTrack(iTrk);                                                     //here it is simulated or just empty track
 515     Int_t ipCh;
 516     ipCh = pTrk->GetHMPIDcluIdx();ipCh/=1000000;
 517     if(ipCh<0) continue;
 518
 519     TClonesArray *pMipCluLst=(TClonesArray *)pClus->At(ipCh);                                   //get the list of clusters
 520     Int_t nMipClusTot = pMipCluLst->GetEntries();                                               //total number of clusters in the given chamber
 521
 522     Double_t qMip=-1;
 523     Int_t chMip=-1;
 524     Double_t xMip = 0;
 525     Double_t yMip = 0;
 526     Int_t indMip  = 0;
 527     Int_t cluMipSiz = 0;
 528
 529     for (Int_t iClu=0; iClu<nMipClusTot;iClu++) {                                               //clusters loop
 530
 531       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pMipCluLst->UncheckedAt(iClu);                    //get the cluster
 532       Double_t qClus = pClu->Q();
 533       if(qClus>qMip) {
 534         qMip  = qClus;
 535         chMip = pClu->Ch();
 536         xMip = pClu->X();
 537         yMip = pClu->Y();
 538         indMip = iClu;
 539         cluMipSiz = pClu->Size();
 540       }
 541     }//clus loop
 542
 543     if(chMip<0) return 1;
 544
 545     Int_t hvsec;
 546     Double_t qthre=0;
 547
 548 // evaluate qThre
 549     if(tsRight){
 550     if(pQthre->GetEntriesFast()==pParam->kMaxCh+1) {                                              // just for backward compatibility
 551       qthre=((TF1*)pQthre->At(chMip))->Eval(ts);                                                  //
 552     } else {                                                                                      // in the past just 1 qthre
 553       hvsec = pParam->InHVSector(yMip);                                                           //  per chamber
 554       if(hvsec>=0) qthre=((TF1*)pQthre->At(6*chMip+hvsec))->Eval(ts);                             //
 555     }
 556    } else qthre = pParam->QCut();
 557 //
 558     if(qMip<qthre) {
 559       pTrk->SetHMPIDmip(xMip,yMip,(Int_t)qMip,0);                                                 //store mip info in any case
 560       pTrk->SetHMPIDcluIdx(chMip,indMip+1000*cluMipSiz);
 561       pTrk->SetHMPIDsignal(pParam->kMipQdcCut);
 562       return 1;                                                                                   //charge compatible with MIP clusters
 563     }
 564
 565     pTrk->SetHMPIDmip(xMip,yMip,(Int_t)qMip,0);                                                   //store mip info in any case
 566     pTrk->SetHMPIDcluIdx(chMip,indMip+1000*cluMipSiz);
 567
 568     Double_t yRa = yMip;                                                                        //just an approx...
 569     Double_t nmean;
 570
 571     Int_t iRad     = pParam->Radiator(yRa);                                                   //evaluate the radiator involved
 572
 573     //evaluate nMean
 574     if(tsRight){
 575     if(pNmean->GetEntries()==21) {                                                              //for backward compatibility
 576       nmean=((TF1*)pNmean->At(3*chMip))->Eval(ts);                                              //C6F14 Nmean for this chamber
 577     } else {
 578       if(iRad < 0) {
 579         nmean = -1;
 580       } else {
 581       Double_t tLow  = ((TF1*)pNmean->At(6*chMip+2*iRad  ))->Eval(ts);                          //C6F14 low  temp for this chamber
 582       Double_t tHigh = ((TF1*)pNmean->At(6*chMip+2*iRad+1))->Eval(ts);                          //C6F14 high temp for this chamber
 583       Double_t tExp  = pParam->FindTemp(tLow,tHigh,yRa);                                        //estimated temp for that chamber at that y
 584       nmean = pParam->NIdxRad(AliHMPIDParam::Instance()->GetEPhotMean(),tExp);                  //mean ref idx @ a given temp
 585       }
 586       if(nmean < 0){                                                                            //track didn' t pass through the radiator
 587          pTrk->SetHMPIDsignal(AliHMPIDRecon::kNoRad);                                           //set the appropriate flag
 588          return 1;
 589         }
 590       }
 591     } else nmean = pParam->MeanIdxRad();
 592     //
 593     if(!reconHTA.CkovHiddenTrk(pTrk,(TClonesArray *)pClus->At(ipCh),indMip,nmean)) {                 //search for track parameters and Cerenkov angle of this track
 594       AliHMPIDPid pID;
 595       Double_t prob[5];
 596       pID.FindPid(pTrk,5,prob);
 597       pTrk->SetHMPIDpid(prob);
 598     }
 599 //      Printf(" Prob e- %6.2f mu %6.2f pi %6.2f k %6.2f p %6.2f",prob[0]*100,prob[1]*100,prob[2]*100,prob[3]*100,prob[4]*100);
 600   }//iTrk
 601
 602   return 0; // error code: 0=no error;
 603
 604 }//Recon()
 605 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 606 void AliHMPIDTracker::FillClusterArray(TObjArray* array) const {
 607
 608  // Publishes all pointers to clusters known to the tracker into the
 609   // passed object array.
 610   // The ownership is not transfered - the caller is not expected to delete
 611   // the clusters
 612
 613   for(Int_t iCh=AliHMPIDParam::kMinCh;iCh<=AliHMPIDParam::kMaxCh;iCh++){
 614     TClonesArray *pCluArr=(TClonesArray*)(*fClu)[iCh];
 615     for (Int_t iClu=0; iClu<pCluArr->GetEntriesFast();iClu++){
 616       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pCluArr->UncheckedAt(iClu);
 617       array->AddLast(pClu);
 618     }//cluster loop in iCh
 619     pCluArr->Delete();
 620   }//Ch loop
 621
 622   return;
 623 }
 624 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++