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   if(!pArr) return kFALSE;
  64   AliHMPIDCluster *pClu=(AliHMPIDCluster*)pArr->UncheckedAt(iClu);//get pointer to cluster
  65   if(!pClu) return kFALSE;
  66   Float_t xyz[3];
  67   pClu->GetGlobalXYZ(xyz);
  68   Float_t cov[6];
  69   pClu->GetGlobalCov(cov);
  70   point.SetXYZ(xyz,cov);
  71   return kTRUE;
  72 }//GetTrackPoint()
  73 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  74 Int_t AliHMPIDTracker::IntTrkCha(AliESDtrack *pTrk,Float_t &xPc,Float_t &yPc,Float_t &xRa,Float_t &yRa,Float_t &theta,Float_t &phi)
  75 {
  76 // Static method to find intersection in between given track and HMPID chambers
  77 // Arguments: pTrk- ESD track; xPc,yPc- track intersection with PC in LORS [cm]
  78 //   Returns: intersected chamber ID or -1
  79   AliHMPIDtrack *hmpTrk = new AliHMPIDtrack(*pTrk);                                             //create a hmpid track to be used for propagation and matching
  80   for(Int_t i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++){                              //chambers loop
  81     Int_t chInt = IntTrkCha(i,hmpTrk,xPc,yPc,xRa,yRa,theta,phi);
  82     if(chInt>=0) {delete hmpTrk;hmpTrk=0x0;return chInt;}
  83   }                                                                                             //chambers loop
  84   delete hmpTrk; hmpTrk=0x0;
  85   return -1;                                                                                    //no intersection with HMPID chambers
  86 }//IntTrkCha()
  87 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  88 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)
  89 {
  90 // Static method to find intersection in between given track and HMPID chambers
  91 // Arguments: pTrk- HMPID track; xPc,yPc- track intersection with PC in LORS [cm]
  92 //   Returns: intersected chamber ID or -1
  93     AliHMPIDParam *pParam=AliHMPIDParam::Instance();
  94     Double_t p1[3],n1[3];
  95     pParam->Norm(ch,n1);
  96     pParam->Point(ch,p1,AliHMPIDParam::kRad);                                                    //point & norm  for middle of radiator plane
  97     Double_t p2[3],n2[3];
  98     pParam->Norm(ch,n2);
  99     pParam->Point(ch,p2,AliHMPIDParam::kPc);                                                     //point & norm  for entrance to PC plane
 100     if(pTrk->Intersect(p1,n1)==kFALSE) return -1;                                                //try to intersect track with the middle of radiator
 101     if(pTrk->Intersect(p2,n2)==kFALSE) return -1;
 102     pParam->Mars2LorsVec(ch,n1,theta,phi);                                                       //track angles at RAD
 103     pParam->Mars2Lors   (ch,p1,xRa,yRa);                                                         //TRKxRAD position
 104     pParam->Mars2Lors   (ch,p2,xPc,yPc);                                                         //TRKxPC position
 105     if(AliHMPIDParam::IsInside(xPc,yPc,pParam->DistCut())==kTRUE) return ch;                     //return intersected chamber
 106   return -1;                                                                                     //no intersection with HMPID chambers
 107 }//IntTrkCha()
 108 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 109 Int_t AliHMPIDTracker::LoadClusters(TTree *pCluTree)
 110 {
 111 // Interface callback methode invoked from AliReconstruction::RunTracking() to load HMPID clusters before PropagateBack() gets control. Done once per event.
 112 // Arguments: pCluTree- pointer to clusters tree got by AliHMPIDLoader::LoadRecPoints("read") then AliHMPIDLoader::TreeR()
 113 //   Returns: error code (currently ignored in AliReconstruction::RunTraking())
 114   for(int i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++) pCluTree->SetBranchAddress(Form("HMPID%d",i),&((*fClu)[i]));
 115   pCluTree->GetEntry(0);
 116   return 0;
 117 }//LoadClusters()
 118 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 119 Int_t AliHMPIDTracker::PropagateBack(AliESDEvent *pEsd)
 120 {
 121 // Interface pure virtual in AliTracker. Invoked from AliReconstruction::RunTracking() after invocation of AliTracker::LoadClusters() once per event
 122 // Agruments: pEsd - pointer to ESD
 123 //   Returns: error code
 124   AliCDBEntry *pNmeanEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Nmean"); //contains TObjArray of 42 TF1 + 1 EPhotMean
 125   AliCDBEntry *pQthreEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Qthre"); //contains TObjArray of 42 (7ch * 6sec) TF1
 126   if(!pNmeanEnt) AliError("No Nmean C6F14 ");
 127   if(!pQthreEnt) AliError("No Qthre");
 128
 129   return Recon(pEsd,fClu,(TObjArray*)pNmeanEnt->GetObject(),(TObjArray*)pQthreEnt->GetObject());
 130 }//PropagateBack()
 131 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 132 Int_t AliHMPIDTracker::Recon(AliESDEvent *pEsd,TObjArray *pClus,TObjArray *pNmean, TObjArray *pQthre)
 133 {
 134 // Static method to reconstruct the Cherenkov angle for all valid tracks of a given event.
 135 // Arguments: pEsd- pointer ESD; pClu- pointer to clusters for all chambers; pNmean - pointer to all function Nmean=f(time)
 136 // Returns: error code, 0 if no errors
 137 //
 138 // Algortihm: Loop over tracks
 139 //
 140 // 1. Find the closest MIP cluster using fast tracks extrapolation method
 141 // 2. Propagate track to the MIP cluster using the STEER method
 142 // 3. Update the track information with MIP cluster (Improved angular and position resolution - to be used for Cherenkov angle calculation)
 143 // 4. Propagate back the constrained track to the radiator radius ( not exact yet)
 144 // 5. Propagation in the last 10 cm with the fast method
 145 // 6. Set ESDtrack information
 146 // 7. Calculate the Cherenkov angle
 147
 148   const Double_t kMaxSnp=0.9;   //maximal snp for prolongation
 149   const Double_t kdRadiator=10; // distance between radiator and the plane
 150   AliHMPIDRecon recon;                                                                           //instance of reconstruction class, nothing important in ctor
 151   AliHMPIDParam *pParam = AliHMPIDParam::Instance();                                             //Instance of AliHMPIDParam
 152   Float_t xPc,yPc,xRa,yRa,theta,phi;
 153
 154   Double_t cluLORS[2]={0};
 155   Int_t nMipClusTot=0;
 156
 157   Double_t qthre = 0;   Double_t nmean=0; Int_t hvsec=0;
 158   Int_t nClusCh[AliHMPIDParam::kMaxCh+1];
 159
 160   Bool_t tsRight = kTRUE;
 161
 162   UInt_t tsmin = (UInt_t)((TF1*)pQthre->At(0))->GetXmin();                                        //
 163   UInt_t tsmax = (UInt_t)((TF1*)pQthre->At(0))->GetXmax();                                        //
 164   UInt_t ts = pEsd->GetTimeStamp();
 165
 166   if(ts<tsmin || ts>tsmax) {
 167     AliWarning(Form(" in HMPID time stamp out of range!!! Please check!!! ts = %i",ts));
 168     tsRight = kFALSE;
 169   }
 170
 171   for(Int_t iTrk=0;iTrk<pEsd->GetNumberOfTracks();iTrk++){                                        //loop on the ESD tracks in the event
 172
 173     //    Double_t bestChi2=99999;chi2=99999;                                                     //init. track matching params
 174     Double_t dmin=999999,bz=0,distCut=1,distParams[5]={1};
 175
 176     Bool_t isOkDcut=kFALSE;
 177     Bool_t isOkQcut=kFALSE;
 178     Bool_t isMatched=kFALSE;
 179
 180     AliHMPIDCluster *bestHmpCluster=0x0;                                                          //the best matching cluster
 181     AliESDtrack *pTrk = pEsd->GetTrack(iTrk);                                                     //get reconstructed track
 182
 183     if(!pTrk->IsOn(AliESDtrack::kTPCout)) continue;
 184
 185     if(pTrk->IsOn(AliESDtrack::kTPCrefit)) continue;
 186     AliESDfriendTrack *ftrack= (AliESDfriendTrack *)pTrk->GetFriendTrack();
 187     if (!ftrack) continue;
 188     if (!ftrack->GetTPCOut()) continue;
 189     AliHMPIDtrack *hmpTrk = new AliHMPIDtrack(*pTrk);                                             //create a hmpid track to be used for propagation and matching
 190     AliHMPIDtrack *hmpTrkConstrained = 0;                                                         //create a hmpid track to be used for propagation and matching
 191     hmpTrk->Set(ftrack->GetTPCOut()->GetX(), ftrack->GetTPCOut()->GetAlpha(),ftrack->GetTPCOut()->GetParameter(), ftrack->GetTPCOut()->GetCovariance());
 192     //
 193     bz=AliTracker::GetBz();
 194
 195     //initial flags for HMPID ESD infos
 196     pTrk->SetHMPIDtrk(0,0,0,0);                                                                //no intersection found
 197     pTrk->SetHMPIDmip(0,0,0,0);                                                                //store mip info in any case
 198     pTrk->SetHMPIDcluIdx(99,99999);                                                            //chamber not found, mip not yet considered
 199     pTrk->SetHMPIDsignal(AliHMPIDRecon::kNotPerformed);                                        //ring reconstruction not yet performed
 200
 201     Int_t ipCh=IntTrkCha(pTrk,xPc,yPc,xRa,yRa,theta,phi);                                        //find the intersected chamber for this track
 202     if(ipCh<0) {delete hmpTrk;hmpTrk=0x0;continue;}                                                                         //no intersection at all, go after next track
 203
 204     pTrk->SetHMPIDtrk(xPc,yPc,theta,phi);                                                        //store initial infos
 205     pTrk->SetHMPIDcluIdx(ipCh,9999);                                                             //set chamber, index of cluster + cluster size
 206
 207     // track intersects the chamber ipCh: find the MIP
 208
 209     TClonesArray *pMipCluLst=(TClonesArray *)pClus->At(ipCh);                                   //get the list of clusters
 210     nMipClusTot = pMipCluLst->GetEntries();                                                     //total number of clusters in the given chamber
 211     nClusCh[ipCh] = nMipClusTot;
 212
 213     if(nMipClusTot==0) {delete hmpTrk;hmpTrk=0x0;continue;}
 214
 215     Int_t index=-1;                                                                               //index of the "best" matching cluster
 216     //
 217     // 1. Find the closest MIP cluster using fast tracks extrapolation method
 218     //
 219     for (Int_t iClu=0; iClu<nMipClusTot;iClu++) {                                                 //clusters loop
 220
 221       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pMipCluLst->UncheckedAt(iClu);                      //get the cluster
 222       // evaluate qThre
 223       if(tsRight){
 224         if(pQthre->GetEntriesFast()==pParam->kMaxCh+1) {
 225           qthre=((TF1*)pQthre->At(pClu->Ch()))->Eval(ts);                                          //
 226         } else {                                                                                   // in the past just 1 qthre
 227           hvsec = pParam->InHVSector(pClu->Y());                                                   //  per chamber
 228           if(hvsec>=0) qthre=((TF1*)pQthre->At(6*ipCh+hvsec))->Eval(ts);                                     //
 229         }
 230       } else qthre = pParam->QCut();
 231
 232       //
 233       if(pClu->Q()<qthre) continue;                                                                      //charge compartible with MIP clusters
 234       isOkQcut = kTRUE;
 235       //
 236       cluLORS[0]=pClu->X(); cluLORS[1]=pClu->Y();                                                        //get the LORS coordinates of the cluster
 237       Double_t dist = TMath::Sqrt((xPc-cluLORS[0])*(xPc-cluLORS[0])+(yPc-cluLORS[1])*(yPc-cluLORS[1]));
 238
 239       if(dist<dmin) {
 240         dmin = dist;
 241         index=iClu;
 242         bestHmpCluster=pClu;
 243       }
 244     } // clusters loop
 245
 246     // moved down
 247     /*if(!isOkQcut) {
 248       pTrk->SetHMPIDsignal(pParam->kMipQdcCut);
 249       delete hmpTrk;hmpTrk=0x0; continue;
 250     }*/
 251
 252     //
 253     // 2. Propagate track to the MIP cluster using the STEER method
 254     //
 255
 256     if(!bestHmpCluster) {delete hmpTrk;hmpTrk=0x0; delete hmpTrkConstrained;hmpTrkConstrained=0x0;  continue;}
 257
 258     TVector3 vG = pParam->Lors2Mars(ipCh,bestHmpCluster->X(),bestHmpCluster->Y());
 259     Double_t gx = vG[0];
 260     Double_t gy = vG[1];
 261     Double_t gz = vG[2];
 262     Double_t alpha=TMath::ATan2(gy,gx);
 263     Double_t radiusH=TMath::Sqrt(gy*gy+gx*gx);
 264     if (!(hmpTrk->Rotate(alpha,kTRUE))) continue;
 265     if(!AliTrackerBase::PropagateTrackToBxByBz(hmpTrk,radiusH,pTrk->GetMass(),1,kFALSE,kMaxSnp,-1)) {delete hmpTrk;hmpTrk=0x0; delete hmpTrkConstrained;hmpTrkConstrained=0x0; continue;}
 266     //
 267     // 3. Update the track with MIP cluster (Improved angular and position resolution - to be used for Cherenkov angle calculation)
 268     //
 269     AliExternalTrackParam trackC(*hmpTrk);
 270     Double_t posC[2]={0,gz};
 271     Double_t covC[3]={0.1*0.1, 0, 0.1*0.1};
 272     trackC.Update(posC,covC);
 273     //
 274     // 4. Propagate back the constrained track to the radiator radius ( not exact yet)
 275     //
 276     hmpTrkConstrained = new AliHMPIDtrack(*pTrk);
 277     hmpTrkConstrained->Set(trackC.GetX(), trackC.GetAlpha(),trackC.GetParameter(), trackC.GetCovariance());
 278     if(!AliTrackerBase::PropagateTrackToBxByBz(hmpTrkConstrained,radiusH-kdRadiator,pTrk->GetMass(),1,kFALSE,kMaxSnp,1)) {delete hmpTrk;hmpTrk=0x0; delete hmpTrkConstrained;hmpTrkConstrained=0x0;continue;}
 279     //
 280     // 5. Propagation in the last 10 cm with the fast method
 281     //
 282     Float_t xPc0=0, yPc0=0;
 283
 284     IntTrkCha(ipCh, hmpTrk, xPc0,yPc0,xRa,yRa,theta,phi);
 285     IntTrkCha(ipCh, hmpTrkConstrained, xPc,yPc,xRa,yRa,theta,phi);
 286     //
 287     // 6. Set ESDtrack information
 288     //
 289     Int_t cluSiz = bestHmpCluster->Size();
 290     pTrk->SetHMPIDmip(bestHmpCluster->X(),bestHmpCluster->Y(),(Int_t)bestHmpCluster->Q(),0);  //store mip info in any case
 291     pTrk->SetHMPIDcluIdx(ipCh,index+1000*cluSiz);                                             //set chamber, index of cluster + cluster size
 292     pTrk->SetHMPIDtrk(xPc0,yPc0,theta,phi);
 293     //
 294     //
 295     // Dump debug info if specified
 296     //
 297     if (AliHMPIDReconstructor::StreamLevel()>0) {
 298       AliExternalTrackParam * trackTPC=new AliExternalTrackParam(*(ftrack->GetTPCOut()));
 299       AliExternalTrackParam * trackCurrent=new AliExternalTrackParam(*pTrk);
 300       if(!trackTPC->Rotate(alpha)) continue;
 301       if(!trackCurrent->Rotate(alpha)) continue;
 302       Bool_t statusTPC= AliTracker::PropagateTrackToBxByBz(trackTPC,radiusH,pTrk->GetMass(),1,kFALSE,kMaxSnp,-1);
 303       Bool_t statusCurrent=AliTracker::PropagateTrackToBxByBz(trackCurrent,radiusH,pTrk->GetMass(),1,kFALSE,kMaxSnp,-1);
 304       AliExternalTrackParam * trackTPCNB=new AliExternalTrackParam(*(ftrack->GetTPCOut()));
 305       if(!trackTPCNB->Rotate(alpha)) continue;
 306       Bool_t statusTPCNB=kTRUE;
 307       Double_t bfield[3]={0,0,0};
 308       for (Double_t radius=trackTPCNB->GetX(); radius<radiusH; radius+=1){
 309         Double_t xyz[3];
 310         trackTPCNB->GetXYZ(xyz);
 311         GetBxByBz(xyz,bfield);
 312         statusTPCNB&=trackTPCNB->PropagateToBxByBz(radius,bfield);
 313       }
 314       statusTPCNB&=trackTPCNB->PropagateToBxByBz(radiusH,bfield);
 315       //
 316       Double_t tanAlpha=TMath::Tan(TMath::ASin(trackTPC->GetSnp()));
 317       Double_t deltaC= trackTPC->GetC(AliTrackerBase::GetBz())-ftrack->GetTPCOut()->GetC(AliTrackerBase::GetBz());
 318       //
 319       AliExternalTrackParam * trackTPCConstrained= new AliExternalTrackParam(*trackTPC);
 320       Double_t pos[2]={0,gz};
 321       Double_t cov[3]={0.1*0.1, 0, 0.1*0.1};
 322       Double_t chi2C =  trackTPCConstrained->GetPredictedChi2(pos,cov);
 323       trackTPCConstrained->Update(pos,cov);
 324       (*fDebugStreamer)<<"track"<<
 325         "rH="<<radiusH<<                      // radius of cluster
 326         "angle="<<tanAlpha<<                  // tan of the local inlination angle
 327         "dC="<<deltaC<<                       // delta of the curvature
 328         "trackTPC.="<<trackTPC<<              // TPC outer param extrapolated to the HMPID
 329         "trackTPCNB.="<<trackTPCNB<<          // TPC track prpagated with material budget correction
 330         "chi2C="<<chi2C<<
 331         "trackTPCC.="<<trackTPCConstrained<<  // TPC outer param extrapolated to the HMPID constrained
 332         "trackCurrent.="<<trackCurrent<<      // current track extrapolated to the HMPID
 333         "sTPC="<<statusTPC<<                  // status for the current TPC  track
 334         "sCurrent="<<statusCurrent<<          // status for the current global track
 335         "cl.="<<bestHmpCluster<<              // HMPID cluster
 336         //
 337         "t.="<<pTrk<<                        // curent esd track
 338         "ft.="<<ftrack<<                     // friend track
 339         "hmpTrk.="<<hmpTrk<<                 // hmpid tracks as used in the following code
 340         "hmpTrkC.="<<hmpTrkConstrained<<     // constrained hmpid tracks as used in the following code
 341         "gx="<<gx<<                          // global cluster position X
 342         "gy="<<gy<<                          // Y
 343         "gz="<<gz<<                          // Z
 344         "\n";
 345     }
 346     //
 347     //
 348     //
 349     if(!isOkQcut) {
 350       pTrk->SetHMPIDsignal(pParam->kMipQdcCut);
 351       delete hmpTrk;hmpTrk=0x0;
 352       delete hmpTrkConstrained;hmpTrkConstrained=0x0;
 353       continue;
 354     }
 355
 356     if(AliHMPIDReconstructor::GetRecoParam())                                                 //retrieve distance cut
 357     {
 358       if(AliHMPIDReconstructor::GetRecoParam()->IsFixedDistCut()==kTRUE)                      //distance cut is fixed number
 359       {
 360         distCut=AliHMPIDReconstructor::GetRecoParam()->GetHmpTrackMatchingDist();
 361       }
 362       else
 363       {
 364         for(Int_t ipar=0;ipar<5;ipar++) distParams[ipar]=AliHMPIDReconstructor::GetRecoParam()->GetHmpTrackMatchingDistParam(ipar);      //prevision: distance cut is function of momentum
 365         distCut=distParams[0]+distParams[1]*TMath::Power(distParams[2]*pTrk->GetP(),distParams[3]); //prevision: change functional form to be more precise
 366       }
 367     }
 368     else {distCut=pParam->DistCut();}
 369
 370     //dmin recalculated
 371
 372     dmin = TMath::Sqrt((xPc0-bestHmpCluster->X())*(xPc0-bestHmpCluster->X())+(yPc0-bestHmpCluster->Y())*(yPc0-bestHmpCluster->Y()));
 373
 374     if(dmin < distCut) {
 375       isOkDcut = kTRUE;
 376     }
 377     //isOkDcut = kTRUE; // switch OFF cut
 378
 379     if(!isOkDcut) {
 380       pTrk->SetHMPIDsignal(pParam->kMipDistCut);                                                //closest cluster with enough charge is still too far from intersection
 381     }
 382
 383     if(isOkQcut*isOkDcut) isMatched = kTRUE;                                                    // MIP-Track matched !!
 384
 385     if(!isMatched) {delete hmpTrk;hmpTrk=0x0;delete hmpTrkConstrained;hmpTrkConstrained=0x0;continue;}                                           // If matched continue...
 386
 387     Bool_t isOk = kTRUE;
 388     if(!isOk) {delete hmpTrk;hmpTrk=0x0; delete hmpTrkConstrained;hmpTrkConstrained=0x0; continue;}
 389     pTrk->SetOuterHmpParam(hmpTrkConstrained,AliESDtrack::kHMPIDout);
 390
 391     FillResiduals(hmpTrk,bestHmpCluster,kFALSE);
 392
 393     Int_t iRad = pParam->Radiator(yRa);                                                          //evaluate the radiator involved
 394
 395     //evaluate nMean
 396     if(tsRight){
 397      if(pNmean->GetEntries()==21) {                                                              //for backward compatibility
 398        nmean=((TF1*)pNmean->At(3*ipCh))->Eval(ts);                                               //C6F14 Nmean for this chamber
 399      } else {
 400        if(iRad < 0) {
 401         nmean = -1;
 402        } else {
 403        Double_t tLow  = ((TF1*)pNmean->At(6*ipCh+2*iRad  ))->Eval(ts);                           //C6F14 low  temp for this chamber
 404        Double_t tHigh = ((TF1*)pNmean->At(6*ipCh+2*iRad+1))->Eval(ts);                           //C6F14 high temp for this chamber
 405        Double_t tExp  = pParam->FindTemp(tLow,tHigh,yRa);                                        //estimated temp for that chamber at that y
 406        nmean = pParam->NIdxRad(AliHMPIDParam::Instance()->GetEPhotMean(),tExp);                  //mean ref idx @ a given temp
 407        }
 408        if(nmean < 0){                                                                            //track didn' t pass through the radiator
 409          pTrk->SetHMPIDsignal(AliHMPIDRecon::kNoRad);                                           //set the appropriate flag
 410          pTrk->SetHMPIDcluIdx(ipCh,index+1000*cluSiz);                                          //set index of cluster
 411          delete hmpTrk;hmpTrk=0x0;
 412          delete hmpTrkConstrained;hmpTrkConstrained=0x0;
 413          continue;
 414         }
 415      }
 416     } else nmean = pParam->MeanIdxRad();
 417     //
 418     // 7. Calculate the Cherenkov angle
 419     //
 420     recon.SetImpPC(xPc0,yPc0);                                                                     //store track impact to PC
 421     recon.CkovAngle(pTrk,(TClonesArray *)pClus->At(ipCh),index,nmean,xRa,yRa);                   //search for Cerenkov angle of this track
 422
 423     Double_t thetaCkov = pTrk->GetHMPIDsignal();
 424
 425     if (AliHMPIDReconstructor::StreamLevel()>0) {
 426       AliExternalTrackParam * trackTPC=new AliExternalTrackParam(*(ftrack->GetTPCOut()));
 427       AliExternalTrackParam * trackCurrent=new AliExternalTrackParam(*pTrk);
 428       if(!trackTPC->Rotate(alpha)) continue;
 429       if(!trackCurrent->Rotate(alpha)) continue;
 430       Bool_t statusTPC= AliTracker::PropagateTrackToBxByBz(trackTPC,radiusH,pTrk->GetMass(),1,kFALSE,kMaxSnp,-1);
 431       Bool_t statusCurrent=AliTracker::PropagateTrackToBxByBz(trackCurrent,radiusH,pTrk->GetMass(),1,kFALSE,kMaxSnp,-1);
 432       Double_t tanAlpha=TMath::Tan(TMath::ASin(trackTPC->GetSnp()));
 433       Double_t deltaC= trackTPC->GetC(AliTrackerBase::GetBz())-ftrack->GetTPCOut()->GetC(AliTrackerBase::GetBz());
 434       //
 435       AliExternalTrackParam * trackTPCNB=new AliExternalTrackParam(*(ftrack->GetTPCOut()));
 436       if(!trackTPCNB->Rotate(alpha)) continue;
 437       Bool_t statusTPCNB=kTRUE;
 438       Double_t bfield[3]={0,0,0};
 439       for (Double_t radius=trackTPCNB->GetX(); radius<radiusH; radius+=1){
 440         Double_t xyz[3];
 441         trackTPCNB->GetXYZ(xyz);
 442         GetBxByBz(xyz,bfield);
 443         statusTPCNB&=trackTPCNB->PropagateToBxByBz(radius,bfield);
 444       }
 445       statusTPCNB&=trackTPCNB->PropagateToBxByBz(radiusH,bfield);
 446
 447       AliExternalTrackParam * trackTPCConstrained= new AliExternalTrackParam(*trackTPC);
 448       Double_t pos[2]={0,gz};
 449       Double_t cov[3]={0.1*0.1, 0, 0.1*0.1};
 450       Double_t chi2C =  trackTPCConstrained->GetPredictedChi2(pos,cov);
 451       trackTPCConstrained->Update(pos,cov);
 452       (*fDebugStreamer)<<"track2"<<
 453         "rH="<<radiusH<<                      // radius of cluster
 454         "angle="<<tanAlpha<<                  // tan of the local inlination angle
 455         "dC="<<deltaC<<                       // delta of the curvature
 456         "trackTPC.="<<trackTPC<<              // TPC outer param extrapolated to the HMPID
 457         "trackTPCNB.="<<trackTPCNB<<          // TPC outer param extrapolated to the HMPID
 458         "chi2C="<<chi2C<<
 459         "trackTPCC.="<<trackTPCConstrained<<  // TPC outer param extrapolated to the HMPID constrained
 460         "trackCurrent.="<<trackCurrent<<      // current track extrapolated to the HMPID
 461         "sTPC="<<statusTPC<<                  // status for the current TPC  track
 462         "sCurrent="<<statusCurrent<<          // status for the current global track
 463         "cl.="<<bestHmpCluster<<              // HMPID cluster
 464         //
 465         "t.="<<pTrk<<                         // curent esd track
 466         "ft.="<<ftrack<<                      // friend track
 467         "hmpTrk.="<<hmpTrk<<                  // hmpid tracks as used in the following code
 468         "hmpTrkC.="<<hmpTrkConstrained<<      // constrained hmpid tracks as used in the following code
 469         "gx="<<gx<<                           // global cluster position X
 470         "gy="<<gy<<                           // Y
 471         "gz="<<gz<<                           // Z
 472         "thetaCkov="<<thetaCkov<<             // Cherenkov angle
 473         "\n";
 474     }
 475
 476     if(pTrk->GetHMPIDsignal()<0) {
 477       delete hmpTrk;hmpTrk=0x0;
 478       delete hmpTrkConstrained; hmpTrkConstrained=0x0;
 479       continue;}
 480
 481     AliHMPIDPid pID;
 482     Double_t prob[5];
 483     pID.FindPid(pTrk,nmean,5,prob);
 484     pTrk->SetHMPIDpid(prob);
 485     delete hmpTrk; hmpTrk=0x0;
 486     delete hmpTrkConstrained; hmpTrkConstrained=0x0;
 487   }//iTrk
 488
 489   return 0; // error code: 0=no error;
 490 }//Recon()
 491 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 492 Int_t AliHMPIDTracker::ReconFromKin(AliESDEvent *pEsd,TObjArray *pClus,TObjArray *pNmean, TObjArray *pQthre)
 493 {
 494 // Static method to reconstruct Theta Ckov for all valid tracks of a given event.
 495 // Arguments: pEsd- pointer ESD; pClu- pointer to clusters for all chambers; pNmean - pointer to all function Nmean=f(time)
 496 //   Returns: error code, 0 if no errors
 497
 498   AliHMPIDRecon recon;                                                                           //instance of reconstruction class, nothing important in ctor
 499   AliHMPIDParam *pParam = AliHMPIDParam::Instance();                                             //Instance of AliHMPIDParam
 500   Float_t xPc,yPc,xRa,yRa,theta,phi;
 501   Double_t cluLORS[2]={0};
 502   Int_t nMipClusTot=0;
 503   Double_t qthre = 0;   Double_t nmean=0; Int_t hvsec=0;
 504   Int_t nClusCh[AliHMPIDParam::kMaxCh+1];
 505
 506   Bool_t tsRight = kTRUE;
 507
 508   UInt_t tsmin = (UInt_t)((TF1*)pQthre->At(0))->GetXmin();                                        //
 509   UInt_t tsmax = (UInt_t)((TF1*)pQthre->At(0))->GetXmax();                                        //
 510   UInt_t ts = pEsd->GetTimeStamp();
 511
 512   if(ts<tsmin || ts>tsmax) {
 513     AliWarning(Form(" in HMPID time stamp out of range!!! Please check!!! ts = %i",ts));
 514     tsRight = kFALSE;
 515   }
 516
 517   for(Int_t iTrk=0;iTrk<pEsd->GetNumberOfTracks();iTrk++){                                        //loop on the ESD tracks in the event
 518
 519     Double_t dmin=999999,bz=0,distCut=1,distParams[5]={1};
 520
 521     Bool_t isOkDcut=kFALSE;
 522     Bool_t isOkQcut=kFALSE;
 523     Bool_t isMatched=kFALSE;
 524
 525     AliHMPIDCluster *bestHmpCluster=0x0;                                                          //the best matching cluster
 526     AliESDtrack *pTrk = pEsd->GetTrack(iTrk);                                                     //get reconstructed track
 527
 528     AliHMPIDtrack *hmpTrk = new AliHMPIDtrack(*pTrk);                                             //create a hmpid track to be used for propagation and matching
 529     bz=AliTracker::GetBz();
 530 //initial flags for HMPID ESD infos
 531     pTrk->SetHMPIDtrk(0,0,0,0);                                                                //no intersection found
 532     pTrk->SetHMPIDmip(0,0,0,0);                                                                //store mip info in any case
 533     pTrk->SetHMPIDcluIdx(99,99999);                                                            //chamber not found, mip not yet considered
 534     pTrk->SetHMPIDsignal(AliHMPIDRecon::kNotPerformed);                                        //ring reconstruction not yet performed
 535
 536     Int_t ipCh=IntTrkCha(pTrk,xPc,yPc,xRa,yRa,theta,phi);                                        //find the intersected chamber for this track
 537     if(ipCh<0) {delete hmpTrk;hmpTrk=0x0;continue;}                                                                         //no intersection at all, go after next track
 538
 539     pTrk->SetHMPIDtrk(xPc,yPc,theta,phi);                                                        //store initial infos
 540     pTrk->SetHMPIDcluIdx(ipCh,9999);                                                             //set chamber, index of cluster + cluster size
 541
 542 // track intersects the chamber ipCh: find the MIP
 543
 544     TClonesArray *pMipCluLst=(TClonesArray *)pClus->At(ipCh);                                   //get the list of clusters
 545     nMipClusTot = pMipCluLst->GetEntries();                                                     //total number of clusters in the given chamber
 546     nClusCh[ipCh] = nMipClusTot;
 547
 548     if(nMipClusTot==0) {delete hmpTrk;hmpTrk=0x0;continue;}
 549
 550     Int_t index=-1;                                                                             //index of the "best" matching cluster
 551
 552     for (Int_t iClu=0; iClu<nMipClusTot;iClu++) {                                               //clusters loop
 553
 554       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pMipCluLst->UncheckedAt(iClu);                    //get the cluster
 555 // evaluate qThre
 556       if(tsRight){
 557        if(pQthre->GetEntriesFast()==pParam->kMaxCh+1) {
 558          qthre=((TF1*)pQthre->At(pClu->Ch()))->Eval(ts);                                         //
 559        } else {                                                                                  // in the past just 1 qthre
 560          hvsec = pParam->InHVSector(pClu->Y());                                                  //  per chamber
 561          if(hvsec>=0) qthre=((TF1*)pQthre->At(6*ipCh+hvsec))->Eval(ts);                                     //
 562         }
 563       } else qthre = pParam->QCut();
 564
 565 //
 566       if(pClu->Q()<qthre) continue;                                                                      //charge compartible with MIP clusters
 567       isOkQcut = kTRUE;
 568 //
 569       cluLORS[0]=pClu->X(); cluLORS[1]=pClu->Y();                                            //get the LORS coordinates of the cluster
 570       Double_t dist = TMath::Sqrt((xPc-cluLORS[0])*(xPc-cluLORS[0])+(yPc-cluLORS[1])*(yPc-cluLORS[1]));
 571
 572       if(dist<dmin) {
 573         dmin = dist;
 574         index=iClu;
 575         bestHmpCluster=pClu;
 576       }
 577     } // clusters loop
 578
 579     if(!isOkQcut) {
 580       pTrk->SetHMPIDsignal(pParam->kMipQdcCut);
 581       delete hmpTrk;hmpTrk=0x0; continue;
 582     }
 583
 584     Double_t radius = (pParam->Lors2Mars(ipCh,pParam->SizeAllX()/2,pParam->SizeAllY()/2)).Mag();
 585
 586     if(!AliTracker::PropagateTrackToBxByBz(hmpTrk,radius,pTrk->GetMass(),1,kFALSE)) {delete hmpTrk;hmpTrk=0x0;continue;}
 587
 588     if(!hmpTrk->PropagateTo(bestHmpCluster)) {delete hmpTrk;hmpTrk=0x0;continue;}
 589
 590     Int_t cluSiz = bestHmpCluster->Size();
 591     pTrk->SetHMPIDmip(bestHmpCluster->X(),bestHmpCluster->Y(),(Int_t)bestHmpCluster->Q(),0);  //store mip info in any case
 592     pTrk->SetHMPIDcluIdx(ipCh,index+1000*cluSiz);                                             //set chamber, index of cluster + cluster size
 593
 594     if(AliHMPIDReconstructor::GetRecoParam())                                                 //retrieve distance cut
 595     {
 596       if(AliHMPIDReconstructor::GetRecoParam()->IsFixedDistCut()==kTRUE)                      //distance cut is fixed number
 597       {
 598         distCut=AliHMPIDReconstructor::GetRecoParam()->GetHmpTrackMatchingDist();
 599       }
 600       else
 601       {
 602         for(Int_t ipar=0;ipar<5;ipar++) distParams[ipar]=AliHMPIDReconstructor::GetRecoParam()->GetHmpTrackMatchingDistParam(ipar);      //prevision: distance cut is function of momentum
 603         distCut=distParams[0]+distParams[1]*TMath::Power(distParams[2]*pTrk->GetP(),distParams[3]); //prevision: change functional form to be more precise
 604       }
 605     }
 606     else {distCut=pParam->DistCut();}
 607
 608     if(dmin < distCut) {
 609       isOkDcut = kTRUE;
 610     }
 611
 612     if(!isOkDcut) {
 613       pTrk->SetHMPIDsignal(pParam->kMipDistCut);                                                //closest cluster with enough charge is still too far from intersection
 614     }
 615
 616     if(isOkQcut*isOkDcut) isMatched = kTRUE;                                                    // MIP-Track matched !!
 617
 618     if(!isMatched) {delete hmpTrk;hmpTrk=0x0;continue;}                                           // If matched continue...
 619
 620     Bool_t isOk = hmpTrk->Update(bestHmpCluster,0.1,0);
 621     if(!isOk) {delete hmpTrk;hmpTrk=0x0;continue;}
 622     pTrk->SetOuterHmpParam(hmpTrk,AliESDtrack::kHMPIDout);
 623
 624     FillResiduals(hmpTrk,bestHmpCluster,kFALSE);
 625
 626     Int_t iRad     = pParam->Radiator(yRa);                                                      //evaluate the radiator involved
 627
 628     //evaluate nMean
 629     if(tsRight){
 630      if(pNmean->GetEntries()==21) {                                                              //for backward compatibility
 631        nmean=((TF1*)pNmean->At(3*ipCh))->Eval(ts);                                               //C6F14 Nmean for this chamber
 632      } else {
 633        if(iRad < 0) {
 634         nmean = -1;
 635        } else {
 636        Double_t tLow  = ((TF1*)pNmean->At(6*ipCh+2*iRad  ))->Eval(ts);                           //C6F14 low  temp for this chamber
 637        Double_t tHigh = ((TF1*)pNmean->At(6*ipCh+2*iRad+1))->Eval(ts);                           //C6F14 high temp for this chamber
 638        Double_t tExp  = pParam->FindTemp(tLow,tHigh,yRa);                                        //estimated temp for that chamber at that y
 639        nmean = pParam->NIdxRad(AliHMPIDParam::Instance()->GetEPhotMean(),tExp);                  //mean ref idx @ a given temp
 640        }
 641        if(nmean < 0){                                                                            //track didn' t pass through the radiator
 642          pTrk->SetHMPIDsignal(AliHMPIDRecon::kNoRad);                                           //set the appropriate flag
 643          pTrk->SetHMPIDcluIdx(ipCh,index+1000*cluSiz);                                          //set index of cluster
 644          delete hmpTrk;hmpTrk=0x0;
 645          continue;
 646         }
 647       }
 648     } else nmean = pParam->MeanIdxRad();
 649
 650     //
 651     recon.SetImpPC(xPc,yPc);                                                                     //store track impact to PC
 652     recon.CkovAngle(pTrk,(TClonesArray *)pClus->At(ipCh),index,nmean,xRa,yRa);                   //search for Cerenkov angle of this track
 653
 654     if(pTrk->GetHMPIDsignal()<0) {delete hmpTrk;hmpTrk=0x0;continue;}
 655
 656     AliHMPIDPid pID;
 657     Double_t prob[5];
 658     pID.FindPid(pTrk,nmean,5,prob);
 659   //  Printf("Tracker RefIndex = %f, chmaber = %i, prob1 = %f, prob2 = %f, prob3 = %f, prob4 = %f, prob5 = %f", nmean,ipCh,prob[0],prob[1],prob[2],prob[3],prob[4]);
 660     pTrk->SetHMPIDpid(prob);
 661     delete hmpTrk;hmpTrk=0x0;
 662   }//iTrk
 663
 664   return 0; // error code: 0=no error;
 665 }//ReconFromKin()
 666 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 667 Int_t AliHMPIDTracker::ReconHiddenTrk(AliESDEvent *pEsd,TObjArray *pClus,TObjArray *pNmean, TObjArray *pQthre)
 668 {
 669 // Static method to reconstruct Theta Ckov for all valid tracks of a given event.
 670 // 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)
 671 //   Returns: error code, 0 if no errors
 672
 673   AliHMPIDReconHTA reconHTA;                                                                     //instance of reconstruction class, nothing important in ctor
 674
 675   AliHMPIDParam *pParam = AliHMPIDParam::Instance();                                             //Instance of AliHMPIDParam
 676
 677   Bool_t tsRight = kTRUE;
 678
 679   UInt_t tsmin = (UInt_t)((TF1*)pQthre->At(0))->GetXmin();                                        //
 680   UInt_t tsmax = (UInt_t)((TF1*)pQthre->At(0))->GetXmax();                                        //
 681   UInt_t ts = pEsd->GetTimeStamp();
 682
 683   if(ts<tsmin || ts>tsmax) {
 684     AliWarning(Form(" in HMPID time stamp out of range!!! Please check!!! ts = %i",ts));
 685     tsRight = kFALSE;
 686   }
 687
 688   for(Int_t iTrk=0;iTrk<pEsd->GetNumberOfTracks();iTrk++){                                        //loop on the ESD tracks in the event
 689
 690     AliESDtrack *pTrk = pEsd->GetTrack(iTrk);                                                     //here it is simulated or just empty track
 691     Int_t ipCh;
 692     ipCh = pTrk->GetHMPIDcluIdx();ipCh/=1000000;
 693     if(ipCh<0) continue;
 694
 695     TClonesArray *pMipCluLst=(TClonesArray *)pClus->At(ipCh);                                   //get the list of clusters
 696     Int_t nMipClusTot = pMipCluLst->GetEntries();                                               //total number of clusters in the given chamber
 697
 698     Double_t qMip=-1;
 699     Int_t chMip=-1;
 700     Double_t xMip = 0;
 701     Double_t yMip = 0;
 702     Int_t indMip  = 0;
 703     Int_t cluMipSiz = 0;
 704
 705     for (Int_t iClu=0; iClu<nMipClusTot;iClu++) {                                               //clusters loop
 706
 707       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pMipCluLst->UncheckedAt(iClu);                    //get the cluster
 708       Double_t qClus = pClu->Q();
 709       if(qClus>qMip) {
 710         qMip  = qClus;
 711         chMip = pClu->Ch();
 712         xMip = pClu->X();
 713         yMip = pClu->Y();
 714         indMip = iClu;
 715         cluMipSiz = pClu->Size();
 716       }
 717     }//clus loop
 718
 719     if(chMip<0) return 1;
 720
 721     Int_t hvsec;
 722     Double_t qthre=0;
 723
 724 // evaluate qThre
 725     if(tsRight){
 726     if(pQthre->GetEntriesFast()==pParam->kMaxCh+1) {                                              // just for backward compatibility
 727       qthre=((TF1*)pQthre->At(chMip))->Eval(ts);                                                  //
 728     } else {                                                                                      // in the past just 1 qthre
 729       hvsec = pParam->InHVSector(yMip);                                                           //  per chamber
 730       if(hvsec>=0) qthre=((TF1*)pQthre->At(6*chMip+hvsec))->Eval(ts);                             //
 731     }
 732    } else qthre = pParam->QCut();
 733 //
 734     if(qMip<qthre) {
 735       pTrk->SetHMPIDmip(xMip,yMip,(Int_t)qMip,0);                                                 //store mip info in any case
 736       pTrk->SetHMPIDcluIdx(chMip,indMip+1000*cluMipSiz);
 737       pTrk->SetHMPIDsignal(pParam->kMipQdcCut);
 738       return 1;                                                                                   //charge compatible with MIP clusters
 739     }
 740
 741     pTrk->SetHMPIDmip(xMip,yMip,(Int_t)qMip,0);                                                   //store mip info in any case
 742     pTrk->SetHMPIDcluIdx(chMip,indMip+1000*cluMipSiz);
 743
 744     Double_t yRa = yMip;                                                                        //just an approx...
 745     Double_t nmean;
 746
 747     Int_t iRad     = pParam->Radiator(yRa);                                                   //evaluate the radiator involved
 748
 749     //evaluate nMean
 750     if(tsRight){
 751     if(pNmean->GetEntries()==21) {                                                              //for backward compatibility
 752       nmean=((TF1*)pNmean->At(3*chMip))->Eval(ts);                                              //C6F14 Nmean for this chamber
 753     } else {
 754       if(iRad < 0) {
 755         nmean = -1;
 756       } else {
 757       Double_t tLow  = ((TF1*)pNmean->At(6*chMip+2*iRad  ))->Eval(ts);                          //C6F14 low  temp for this chamber
 758       Double_t tHigh = ((TF1*)pNmean->At(6*chMip+2*iRad+1))->Eval(ts);                          //C6F14 high temp for this chamber
 759       Double_t tExp  = pParam->FindTemp(tLow,tHigh,yRa);                                        //estimated temp for that chamber at that y
 760       nmean = pParam->NIdxRad(AliHMPIDParam::Instance()->GetEPhotMean(),tExp);                  //mean ref idx @ a given temp
 761       }
 762       if(nmean < 0){                                                                            //track didn' t pass through the radiator
 763          pTrk->SetHMPIDsignal(AliHMPIDRecon::kNoRad);                                           //set the appropriate flag
 764          return 1;
 765         }
 766       }
 767     } else nmean = pParam->MeanIdxRad();
 768     //
 769     if(!reconHTA.CkovHiddenTrk(pTrk,(TClonesArray *)pClus->At(ipCh),indMip,nmean)) {                 //search for track parameters and Cerenkov angle of this track
 770       AliHMPIDPid pID;
 771       Double_t prob[5];
 772       pID.FindPid(pTrk,nmean,5,prob);
 773       pTrk->SetHMPIDpid(prob);
 774     }
 775 //      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);
 776   }//iTrk
 777
 778   return 0; // error code: 0=no error;
 779
 780 }//Recon()
 781 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 782 void AliHMPIDTracker::FillClusterArray(TObjArray* array) const {
 783
 784  // Publishes all pointers to clusters known to the tracker into the
 785   // passed object array.
 786   // The ownership is not transfered - the caller is not expected to delete
 787   // the clusters
 788
 789   for(Int_t iCh=AliHMPIDParam::kMinCh;iCh<=AliHMPIDParam::kMaxCh;iCh++){
 790     TClonesArray *pCluArr=(TClonesArray*)(*fClu)[iCh];
 791     for (Int_t iClu=0; iClu<pCluArr->GetEntriesFast();iClu++){
 792       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pCluArr->UncheckedAt(iClu);
 793       array->AddLast(pClu);
 794     }//cluster loop in iCh
 795     pCluArr->Delete();
 796   }//Ch loop
 797
 798   return;
 799 }
 800 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++