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 //.
  20 // HMPID base class fo tracking
  21 //.
  22 //.
  23 //.
  24 ClassImp(AliHMPIDTracker)
  25 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  26 AliHMPIDTracker::AliHMPIDTracker():
  27   AliTracker(),
  28   fClu(new TObjArray(AliHMPIDParam::kMaxCh+1))
  29 {
  30 // ctor. Create TObjArray of TClonesArray of AliHMPIDCluster
  31 //
  32 //
  33   fClu->SetOwner(kTRUE);
  34   for(int i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++) fClu->AddAt(new TClonesArray("AliHMPIDCluster"),i);
  35 }//ctor
  36 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  37 Bool_t AliHMPIDTracker::GetTrackPoint(Int_t idx, AliTrackPoint& point) const
  38 {
  39 // Interface callback methode invoked from AliReconstruction::WriteAlignmentData() to get position of MIP cluster in MARS associated to a current track.
  40 // MIP cluster is reffered by index which is stored in AliESDtrack  ???????
  41 // Arguments: idx- cluster index which is stored by HMPID in AliESDtrack
  42 //            point- reference to the object where to store the point
  43 //   Returns: status of operation  if FALSE then AliReconstruction::WriteAlignmentData() do not store this point to array of points for current track.
  44   if(idx<0) return kFALSE; //no MIP cluster assigned to this track in PropagateBack()
  45   Int_t iCham=idx/1000000; Int_t iClu=idx%1000000;
  46   iClu = iClu%1000; //GetHMPIDcluIdx -> 1e+6*ch + 1e+3*clusize + cluIdx;
  47   point.SetVolumeID(AliGeomManager::LayerToVolUID(AliGeomManager::kHMPID,iCham));//layer and chamber number
  48   TClonesArray *pArr=(TClonesArray*)(*fClu)[iCham];
  49   AliHMPIDCluster *pClu=(AliHMPIDCluster*)pArr->UncheckedAt(iClu);//get pointer to cluster
  50   Float_t xyz[3];
  51   pClu->GetGlobalXYZ(xyz);
  52   Float_t cov[6];
  53   pClu->GetGlobalCov(cov);
  54   point.SetXYZ(xyz,cov);
  55   return kTRUE;
  56 }//GetTrackPoint()
  57 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  58 Int_t AliHMPIDTracker::IntTrkCha(AliESDtrack *pTrk,Float_t &xPc,Float_t &yPc,Float_t &xRa,Float_t &yRa,Float_t &theta,Float_t &phi)
  59 {
  60 // Static method to find intersection in between given track and HMPID chambers
  61 // Arguments: pTrk- ESD track; xPc,yPc- track intersection with PC in LORS [cm]
  62 //   Returns: intersected chamber ID or -1
  63   AliHMPIDtrack *hmpTrk = new AliHMPIDtrack(*pTrk);                                             //create a hmpid track to be used for propagation and matching
  64   for(Int_t i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++){                              //chambers loop
  65     Int_t chInt = IntTrkCha(i,hmpTrk,xPc,yPc,xRa,yRa,theta,phi);
  66     if(chInt>=0) {delete hmpTrk;hmpTrk=0x0;return chInt;}
  67   }                                                                                             //chambers loop
  68   delete hmpTrk; hmpTrk=0x0;
  69   return -1;                                                                                    //no intersection with HMPID chambers
  70 }//IntTrkCha()
  71 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  72 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)
  73 {
  74 // Static method to find intersection in between given track and HMPID chambers
  75 // Arguments: pTrk- HMPID track; xPc,yPc- track intersection with PC in LORS [cm]
  76 //   Returns: intersected chamber ID or -1
  77     AliHMPIDParam *pParam=AliHMPIDParam::Instance();
  78     Double_t p1[3],n1[3];
  79     pParam->Norm(ch,n1);
  80     pParam->Point(ch,p1,AliHMPIDParam::kRad);                                                    //point & norm  for middle of radiator plane
  81     Double_t p2[3],n2[3];
  82     pParam->Norm(ch,n2);
  83     pParam->Point(ch,p2,AliHMPIDParam::kPc);                                                     //point & norm  for entrance to PC plane
  84     if(pTrk->Intersect(p1,n1)==kFALSE) return -1;                                                //try to intersect track with the middle of radiator
  85     if(pTrk->Intersect(p2,n2)==kFALSE) return -1;
  86     pParam->Mars2LorsVec(ch,n1,theta,phi);                                                       //track angles at RAD
  87     pParam->Mars2Lors   (ch,p1,xRa,yRa);                                                         //TRKxRAD position
  88     pParam->Mars2Lors   (ch,p2,xPc,yPc);                                                         //TRKxPC position
  89     if(AliHMPIDParam::IsInside(xPc,yPc,pParam->DistCut())==kTRUE) return ch;                     //return intersected chamber
  90   return -1;                                                                                     //no intersection with HMPID chambers
  91 }//IntTrkCha()
  92 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  93 Int_t AliHMPIDTracker::LoadClusters(TTree *pCluTree)
  94 {
  95 // Interface callback methode invoked from AliReconstruction::RunTracking() to load HMPID clusters before PropagateBack() gets control. Done once per event.
  96 // Arguments: pCluTree- pointer to clusters tree got by AliHMPIDLoader::LoadRecPoints("read") then AliHMPIDLoader::TreeR()
  97 //   Returns: error code (currently ignored in AliReconstruction::RunTraking())
  98   for(int i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++) pCluTree->SetBranchAddress(Form("HMPID%d",i),&((*fClu)[i]));
  99   pCluTree->GetEntry(0);
 100   return 0;
 101 }//LoadClusters()
 102 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 103 Int_t AliHMPIDTracker::PropagateBack(AliESDEvent *pEsd)
 104 {
 105 // Interface pure virtual in AliTracker. Invoked from AliReconstruction::RunTracking() after invocation of AliTracker::LoadClusters() once per event
 106 // Agruments: pEsd - pointer to ESD
 107 //   Returns: error code
 108   AliCDBEntry *pNmeanEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Nmean"); //contains TObjArray of 42 TF1 + 1 EPhotMean
 109   AliCDBEntry *pQthreEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Qthre"); //contains TObjArray of 42 (7ch * 6sec) TF1
 110   if(!pNmeanEnt) AliError("No Nmean C6F14 ");
 111   if(!pQthreEnt) AliError("No Qthre");
 112
 113   return Recon(pEsd,fClu,(TObjArray*)pNmeanEnt->GetObject(),(TObjArray*)pQthreEnt->GetObject());
 114 }//PropagateBack()
 115 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 116 Int_t AliHMPIDTracker::Recon(AliESDEvent *pEsd,TObjArray *pClus,TObjArray *pNmean, TObjArray *pQthre)
 117 {
 118 // Static method to reconstruct Theta Ckov for all valid tracks of a given event.
 119 // Arguments: pEsd- pointer ESD; pClu- pointer to clusters for all chambers; pNmean - pointer to all function Nmean=f(time)
 120 //   Returns: error code, 0 if no errors
 121
 122   AliHMPIDRecon recon;                                                                           //instance of reconstruction class, nothing important in ctor
 123   AliHMPIDParam *pParam = AliHMPIDParam::Instance();                                             //Instance of AliHMPIDParam
 124   Float_t xPc,yPc,xRa,yRa,theta,phi;
 125   Double_t cluLORS[2]={0};
 126 //  Double_t cluMARS[3]={0},trkMARS[3]={0};
 127 //  Double_t bestcluMARS[3]={0,0,0};
 128 //  Double_t radClu,radInitTrk;
 129   Int_t nMipClusTot=0;
 130 //  Double_t d3d=0;
 131   Double_t qthre = 0;   Double_t nmean=0; Int_t hvsec=0;
 132   Int_t nClusCh[AliHMPIDParam::kMaxCh+1];
 133
 134   UInt_t tsmin = (UInt_t)((TF1*)pQthre->At(0))->GetXmin();                                        //
 135   UInt_t tsmax = (UInt_t)((TF1*)pQthre->At(0))->GetXmax();                                        //
 136   UInt_t ts = pEsd->GetTimeStamp();
 137
 138   if(ts<tsmin || ts>tsmax) {
 139     AliWarning(Form(" in HMPID time stamp out of range!!! Please check!!! ts = %i",ts));
 140     return 1;
 141   }
 142
 143   for(Int_t iTrk=0;iTrk<pEsd->GetNumberOfTracks();iTrk++){                                        //loop on the ESD tracks in the event
 144
 145 //    Double_t bestChi2=99999;chi2=99999;                                                          //init. track matching params
 146     Double_t dmin=999999,bz=0,distCut=1,distParams[5]={1};
 147
 148     Bool_t isOkDcut=kFALSE;
 149     Bool_t isOkQcut=kFALSE;
 150     Bool_t isMatched=kFALSE;
 151
 152     AliHMPIDCluster *bestHmpCluster=0x0;                                                          //the best matching cluster
 153     AliESDtrack *pTrk = pEsd->GetTrack(iTrk);                                                     //get reconstructed track
 154
 155     if(!pTrk->IsOn(AliESDtrack::kTPCout)) continue;
 156
 157     if(pTrk->IsOn(AliESDtrack::kTPCrefit)) continue;
 158
 159     AliHMPIDtrack *hmpTrk = new AliHMPIDtrack(*pTrk);                                             //create a hmpid track to be used for propagation and matching
 160     bz=AliTracker::GetBz();
 161 //initial flags for HMPID ESD infos
 162     pTrk->SetHMPIDtrk(0,0,0,0);                                                                //no intersection found
 163     pTrk->SetHMPIDmip(0,0,0,0);                                                                //store mip info in any case
 164     pTrk->SetHMPIDcluIdx(99,99999);                                                            //chamber not found, mip not yet considered
 165     pTrk->SetHMPIDsignal(AliHMPIDRecon::kNotPerformed);                                        //ring reconstruction not yet performed
 166
 167     Int_t ipCh=IntTrkCha(pTrk,xPc,yPc,xRa,yRa,theta,phi);                                        //find the intersected chamber for this track
 168     if(ipCh<0) continue;                                                                         //no intersection at all, go after next track
 169
 170     pTrk->SetHMPIDtrk(xPc,yPc,theta,phi);                                                        //store initial infos
 171     pTrk->SetHMPIDcluIdx(ipCh,9999);                                                             //set chamber, index of cluster + cluster size
 172
 173 // track intersects the chamber ipCh: find the MIP
 174
 175     TClonesArray *pMipCluLst=(TClonesArray *)pClus->At(ipCh);                                   //get the list of clusters
 176     nMipClusTot = pMipCluLst->GetEntries();                                                     //total number of clusters in the given chamber
 177     nClusCh[ipCh] = nMipClusTot;
 178
 179     if(nMipClusTot==0) continue;
 180
 181     Int_t index=-1;                                                                             //index of the "best" matching cluster
 182
 183     for (Int_t iClu=0; iClu<nMipClusTot;iClu++) {                                               //clusters loop
 184
 185       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pMipCluLst->UncheckedAt(iClu);                    //get the cluster
 186 // evaluate qThre
 187       if(pQthre->GetEntriesFast()==pParam->kMaxCh+1) {
 188         qthre=((TF1*)pQthre->At(pClu->Ch()))->Eval(ts);                                         //
 189       } else {                                                                                  // in the past just 1 qthre
 190         hvsec = pParam->InHVSector(pClu->Y());                                                  //  per chamber
 191         if(hvsec>=0){
 192           qthre=((TF1*)pQthre->At(6*ipCh+hvsec))->Eval(ts);                                     //
 193         }
 194
 195        }                                                                                            //
 196 //
 197       if(pClu->Q()<qthre) continue;                                                                      //charge compartible with MIP clusters
 198       isOkQcut = kTRUE;
 199 //
 200       cluLORS[0]=pClu->X(); cluLORS[1]=pClu->Y();                                            //get the LORS coordinates of the cluster
 201       Double_t dist = TMath::Sqrt((xPc-cluLORS[0])*(xPc-cluLORS[0])+(yPc-cluLORS[1])*(yPc-cluLORS[1]));
 202
 203       if(dist<dmin) {
 204         dmin = dist;
 205         index=iClu;
 206         bestHmpCluster=pClu;
 207       }
 208     }
 209
 210     if(!isOkQcut) {
 211       pTrk->SetHMPIDsignal(pParam->kMipQdcCut);
 212       continue;
 213     }
 214
 215     Double_t radius = (pParam->Lors2Mars(ipCh,pParam->SizeAllX()/2,pParam->SizeAllY()/2)).Mag();
 216
 217     if(!AliTracker::PropagateTrackToBxByBz(hmpTrk,radius,pTrk->GetMass(),1,kFALSE)) continue;
 218
 219     if(!hmpTrk->PropagateTo(bestHmpCluster)) continue;
 220
 221     Int_t cluSiz = bestHmpCluster->Size();
 222     pTrk->SetHMPIDmip(bestHmpCluster->X(),bestHmpCluster->Y(),(Int_t)bestHmpCluster->Q(),0);  //store mip info in any case
 223     pTrk->SetHMPIDcluIdx(ipCh,index+1000*cluSiz);                                             //set chamber, index of cluster + cluster size
 224
 225     if(AliHMPIDReconstructor::GetRecoParam())                                                 //retrieve distance cut
 226     {
 227       if(AliHMPIDReconstructor::GetRecoParam()->IsFixedDistCut()==kTRUE)                      //distance cut is fixed number
 228       {
 229         distCut=AliHMPIDReconstructor::GetRecoParam()->GetHmpTrackMatchingDist();
 230       }
 231       else
 232       {
 233         for(Int_t ipar=0;ipar<5;ipar++) distParams[ipar]=AliHMPIDReconstructor::GetRecoParam()->GetHmpTrackMatchingDistParam(ipar);      //prevision: distance cut is function of momentum
 234         distCut=distParams[0]+distParams[1]*TMath::Power(distParams[2]*pTrk->GetP(),distParams[3]); //prevision: change functional form to be more precise
 235       }
 236     }
 237     else {distCut=pParam->DistCut();}
 238
 239     if(dmin < distCut) {
 240       isOkDcut = kTRUE;
 241     }
 242
 243
 244
 245     if(!isOkDcut) {
 246       pTrk->SetHMPIDsignal(pParam->kMipDistCut);                                                //closest cluster with enough charge is still too far from intersection
 247     }
 248
 249     if(isOkQcut*isOkDcut) isMatched = kTRUE;                                                    // MIP-Track matched !!
 250
 251     if(!isMatched) continue;                                                                    // If matched continue...
 252
 253     Bool_t isOk = hmpTrk->Update(bestHmpCluster,0.1,0);
 254     if(!isOk) continue;
 255     pTrk->SetOuterHmpParam(hmpTrk,AliESDtrack::kHMPIDout);
 256
 257     FillResiduals(hmpTrk,bestHmpCluster,kFALSE);
 258
 259
 260     //evaluate nMean
 261     if(pNmean->GetEntries()==21) {                                                              //for backward compatibility
 262       nmean=((TF1*)pNmean->At(3*ipCh))->Eval(ts);                                               //C6F14 Nmean for this chamber
 263     } else {
 264       Int_t iRad     = pParam->Radiator(yRa);                                                   //evaluate the radiator involved
 265       if(iRad < 0) {
 266         nmean = -1;
 267       } else {
 268       Double_t tLow  = ((TF1*)pNmean->At(6*ipCh+2*iRad  ))->Eval(ts);                           //C6F14 low  temp for this chamber
 269       Double_t tHigh = ((TF1*)pNmean->At(6*ipCh+2*iRad+1))->Eval(ts);                           //C6F14 high temp for this chamber
 270       Double_t tExp  = pParam->FindTemp(tLow,tHigh,yRa);                                        //estimated temp for that chamber at that y
 271       nmean = pParam->NIdxRad(AliHMPIDParam::Instance()->GetEPhotMean(),tExp);                  //mean ref idx @ a given temp
 272       }
 273       if(nmean < 0){                                                                            //track didn' t pass through the radiator
 274          pTrk->SetHMPIDsignal(AliHMPIDRecon::kNoRad);                                           //set the appropriate flag
 275          pTrk->SetHMPIDcluIdx(ipCh,index+1000*cluSiz);                                          //set index of cluster
 276          continue;
 277       }
 278     }
 279     //
 280     recon.SetImpPC(xPc,yPc);                                                                     //store track impact to PC
 281     recon.CkovAngle(pTrk,(TClonesArray *)pClus->At(ipCh),index,nmean,xRa,yRa);                   //search for Cerenkov angle of this track
 282
 283     if(pTrk->GetHMPIDsignal()<0) continue;
 284
 285     AliHMPIDPid pID;
 286     Double_t prob[5];
 287     pID.FindPid(pTrk,5,prob);
 288     pTrk->SetHMPIDpid(prob);
 289 //      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);
 290     delete hmpTrk;hmpTrk=0x0;
 291   }//iTrk
 292
 293   return 0; // error code: 0=no error;
 294 }//Recon()
 295 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 296 Int_t AliHMPIDTracker::ReconHiddenTrk(AliESDEvent *pEsd,TObjArray *pClus,TObjArray *pNmean, TObjArray *pQthre)
 297 {
 298 // Static method to reconstruct Theta Ckov for all valid tracks of a given event.
 299 // 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)
 300 //   Returns: error code, 0 if no errors
 301
 302   AliHMPIDReconHTA reconHTA;                                                                     //instance of reconstruction class, nothing important in ctor
 303
 304   AliHMPIDParam *pParam = AliHMPIDParam::Instance();                                             //Instance of AliHMPIDParam
 305
 306   UInt_t tsmin = (UInt_t)((TF1*)pQthre->At(0))->GetXmin();                                        //
 307   UInt_t tsmax = (UInt_t)((TF1*)pQthre->At(0))->GetXmax();                                        //
 308   UInt_t ts = pEsd->GetTimeStamp();
 309
 310   if(ts<tsmin || ts>tsmax) {
 311     AliWarning(Form(" in HMPID time stamp out of range!!! Please check!!! ts = %i",ts));
 312     return 1;
 313   }
 314
 315   for(Int_t iTrk=0;iTrk<pEsd->GetNumberOfTracks();iTrk++){                                        //loop on the ESD tracks in the event
 316
 317     AliESDtrack *pTrk = pEsd->GetTrack(iTrk);                                                     //here it is simulated or just empty track
 318     Int_t ipCh;
 319     ipCh = pTrk->GetHMPIDcluIdx();ipCh/=1000000;
 320     if(ipCh<0) continue;
 321
 322     TClonesArray *pMipCluLst=(TClonesArray *)pClus->At(ipCh);                                   //get the list of clusters
 323     Int_t nMipClusTot = pMipCluLst->GetEntries();                                               //total number of clusters in the given chamber
 324
 325     Double_t qMip=-1;
 326     Int_t chMip=-1;
 327     Double_t xMip = 0;
 328     Double_t yMip = 0;
 329     Int_t indMip  = 0;
 330     Int_t cluMipSiz = 0;
 331
 332     for (Int_t iClu=0; iClu<nMipClusTot;iClu++) {                                               //clusters loop
 333
 334       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pMipCluLst->UncheckedAt(iClu);                    //get the cluster
 335       Double_t qClus = pClu->Q();
 336       if(qClus>qMip) {
 337         qMip  = qClus;
 338         chMip = pClu->Ch();
 339         xMip = pClu->X();
 340         yMip = pClu->Y();
 341         indMip = iClu;
 342         cluMipSiz = pClu->Size();
 343       }
 344     }//clus loop
 345
 346     if(chMip<0) return 1;
 347
 348     Int_t hvsec;
 349     Double_t qthre=0;
 350 // evaluate qThre
 351     if(pQthre->GetEntriesFast()==pParam->kMaxCh+1) {                                              // just for backward compatibility
 352       qthre=((TF1*)pQthre->At(chMip))->Eval(ts);                                                  //
 353     } else {                                                                                      // in the past just 1 qthre
 354       hvsec = pParam->InHVSector(yMip);                                                           //  per chamber
 355       if(hvsec>=0) qthre=((TF1*)pQthre->At(6*chMip+hvsec))->Eval(ts);                             //
 356     }
 357 //
 358     if(qMip<qthre) {
 359       pTrk->SetHMPIDmip(xMip,yMip,(Int_t)qMip,0);                                                 //store mip info in any case
 360       pTrk->SetHMPIDcluIdx(chMip,indMip+1000*cluMipSiz);
 361       pTrk->SetHMPIDsignal(pParam->kMipQdcCut);
 362       return 1;                                                                                   //charge compatible with MIP clusters
 363     }
 364
 365     pTrk->SetHMPIDmip(xMip,yMip,(Int_t)qMip,0);                                                   //store mip info in any case
 366     pTrk->SetHMPIDcluIdx(chMip,indMip+1000*cluMipSiz);
 367
 368     Double_t yRa = yMip;                                                                        //just an approx...
 369     Double_t nmean;
 370     //evaluate nMean
 371     if(pNmean->GetEntries()==21) {                                                              //for backward compatibility
 372       nmean=((TF1*)pNmean->At(3*chMip))->Eval(ts);                                              //C6F14 Nmean for this chamber
 373     } else {
 374       Int_t iRad     = pParam->Radiator(yRa);                                                   //evaluate the radiator involved
 375       if(iRad < 0) {
 376         nmean = -1;
 377       } else {
 378       Double_t tLow  = ((TF1*)pNmean->At(6*chMip+2*iRad  ))->Eval(ts);                          //C6F14 low  temp for this chamber
 379       Double_t tHigh = ((TF1*)pNmean->At(6*chMip+2*iRad+1))->Eval(ts);                          //C6F14 high temp for this chamber
 380       Double_t tExp  = pParam->FindTemp(tLow,tHigh,yRa);                                        //estimated temp for that chamber at that y
 381       nmean = pParam->NIdxRad(AliHMPIDParam::Instance()->GetEPhotMean(),tExp);                  //mean ref idx @ a given temp
 382       }
 383       if(nmean < 0){                                                                            //track didn' t pass through the radiator
 384          pTrk->SetHMPIDsignal(AliHMPIDRecon::kNoRad);                                           //set the appropriate flag
 385          return 1;
 386       }
 387     }
 388     //
 389     if(!reconHTA.CkovHiddenTrk(pTrk,(TClonesArray *)pClus->At(ipCh),indMip,nmean)) {                 //search for track parameters and Cerenkov angle of this track
 390       AliHMPIDPid pID;
 391       Double_t prob[5];
 392       pID.FindPid(pTrk,5,prob);
 393       pTrk->SetHMPIDpid(prob);
 394     }
 395 //      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);
 396   }//iTrk
 397
 398   return 0; // error code: 0=no error;
 399
 400 }//Recon()
 401 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 402 void AliHMPIDTracker::FillClusterArray(TObjArray* array) const {
 403
 404  // Publishes all pointers to clusters known to the tracker into the
 405   // passed object array.
 406   // The ownership is not transfered - the caller is not expected to delete
 407   // the clusters
 408
 409   for(Int_t iCh=AliHMPIDParam::kMinCh;iCh<=AliHMPIDParam::kMaxCh;iCh++){
 410     TClonesArray *pCluArr=(TClonesArray*)(*fClu)[iCh];
 411     for (Int_t iClu=0; iClu<pCluArr->GetEntriesFast();iClu++){
 412       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pCluArr->UncheckedAt(iClu);
 413       array->AddLast(pClu);
 414     }//cluster loop in iCh
 415     pCluArr->Delete();
 416   }//Ch loop
 417
 418   return;
 419 }
 420 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++