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 "AliHMPIDReconHTA.h"    //ReconHTA()
   8 #include <AliESDEvent.h>         //PropagateBack(),Recon()
   9 #include <AliESDtrack.h>         //Intersect()
  10 #include <AliRun.h>              //GetTrackPoint(),PropagateBack()
  11 #include <AliTrackPointArray.h>  //GetTrackPoint()
  12 #include <AliAlignObj.h>         //GetTrackPoint()
  13 #include <AliCDBManager.h>       //PropageteBack()
  14 #include <AliCDBEntry.h>         //PropageteBack()
  15 //.
  16 // HMPID base class fo tracking
  17 //.
  18 //.
  19 //.
  20 ClassImp(AliHMPIDTracker)
  21 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  22 AliHMPIDTracker::AliHMPIDTracker():
  23   AliTracker(),
  24   fClu(new TObjArray(AliHMPIDParam::kMaxCh+1))
  25 {
  26 // ctor. Create TObjArray of TClonesArray of AliHMPIDCluster
  27 //
  28 //
  29   fClu->SetOwner(kTRUE);
  30   for(int i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++) fClu->AddAt(new TClonesArray("AliHMPIDCluster"),i);
  31 }//ctor
  32 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  33 Bool_t AliHMPIDTracker::GetTrackPoint(Int_t idx, AliTrackPoint& point) const
  34 {
  35 // Interface callback methode invoked from AliReconstruction::WriteAlignmentData() to get position of MIP cluster in MARS associated to a current track.
  36 // MIP cluster is reffered by index which is stored in AliESDtrack  ???????
  37 // Arguments: idx- cluster index which is stored by HMPID in AliESDtrack
  38 //            point- reference to the object where to store the point
  39 //   Returns: status of operation  if FALSE then AliReconstruction::WriteAlignmentData() do not store this point to array of points for current track.
  40   if(idx<0) return kFALSE; //no MIP cluster assigned to this track in PropagateBack()
  41   Int_t iCham=idx/1000000; Int_t iClu=idx%1000000;
  42   point.SetVolumeID(AliGeomManager::LayerToVolUID(AliGeomManager::kHMPID,iCham-1));//layer and chamber number
  43   TClonesArray *pArr=(TClonesArray*)(*fClu)[iCham];
  44   AliHMPIDCluster *pClu=(AliHMPIDCluster*)pArr->UncheckedAt(iClu);//get pointer to cluster
  45   Double_t mars[3];
  46   AliHMPIDParam::Instance()->Lors2Mars(iCham,pClu->X(),pClu->Y(),mars);
  47   point.SetXYZ(mars[0],mars[1],mars[2]);
  48   return kTRUE;
  49 }//GetTrackPoint()
  50 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  51 Int_t AliHMPIDTracker::IntTrkCha(AliESDtrack *pTrk,Float_t &xPc,Float_t &yPc,Float_t &xRa,Float_t &yRa,Float_t &theta,Float_t &phi)
  52 {
  53 // Static method to find intersection in between given track and HMPID chambers
  54 // Arguments: pTrk- ESD track; xPc,yPc- track intersection with PC in LORS [cm]
  55 //   Returns: intersected chamber ID or -1
  56   AliHMPIDParam *pParam=AliHMPIDParam::Instance();
  57   for(Int_t i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++){                              //chambers loop
  58     Double_t p1[3],n1[3]; pParam->Norm(i,n1); pParam->Point(i,p1,AliHMPIDParam::kRad);          //point & norm  for middle of radiator plane
  59     Double_t p2[3],n2[3]; pParam->Norm(i,n2); pParam->Point(i,p2,AliHMPIDParam::kPc);           //point & norm  for entrance to PC plane
  60     if(pTrk->Intersect(p1,n1,-GetBz())==kFALSE) continue;                                       //try to intersect track with the middle of radiator
  61     if(pTrk->Intersect(p2,n2,-GetBz())==kFALSE) continue;                                       //try to intersect track with PC
  62     pParam->Mars2LorsVec(i,n1,theta,phi);                                                       //track angles at RAD
  63     pParam->Mars2Lors   (i,p1,xRa,yRa);                                                         //TRKxRAD position
  64     pParam->Mars2Lors   (i,p2,xPc,yPc);                                                         //TRKxPC position
  65     if(AliHMPIDParam::IsInside(xPc,yPc,pParam->DistCut())==kTRUE) return i;                     //return intersected chamber
  66   }                                                                                             //chambers loop
  67   return -1;                                                                                    //no intersection with HMPID chambers
  68 }//IntTrkCha()
  69 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  70 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)
  71 {
  72 // Static method to find intersection in between given track and HMPID chambers
  73 // Arguments: pTrk- HMPID track; xPc,yPc- track intersection with PC in LORS [cm]
  74 //   Returns: intersected chamber ID or -1
  75     AliHMPIDParam *pParam=AliHMPIDParam::Instance();
  76     Double_t p1[3],n1[3];
  77     pParam->Norm(ch,n1);
  78     pParam->Point(ch,p1,AliHMPIDParam::kRad);                                                    //point & norm  for middle of radiator plane
  79     Double_t p2[3],n2[3];
  80     pParam->Norm(ch,n2);
  81     pParam->Point(ch,p2,AliHMPIDParam::kPc);                                                     //point & norm  for entrance to PC plane
  82     if(pTrk->Intersect(pTrk,p1,n1)==kFALSE) return -1;                                           //try to intersect track with the middle of radiator
  83     if(pTrk->Intersect(pTrk,p2,n2)==kFALSE) return -1;
  84     pParam->Mars2LorsVec(ch,n1,theta,phi);                                                       //track angles at RAD
  85     pParam->Mars2Lors   (ch,p1,xRa,yRa);                                                         //TRKxRAD position
  86     pParam->Mars2Lors   (ch,p2,xPc,yPc);                                                         //TRKxPC position
  87     if(AliHMPIDParam::IsInside(xPc,yPc,pParam->DistCut())==kTRUE) return ch;                     //return intersected chamber
  88   return -1;                                                                                     //no intersection with HMPID chambers
  89 }//IntTrkCha()
  90 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  91 Int_t AliHMPIDTracker::LoadClusters(TTree *pCluTree)
  92 {
  93 // Interface callback methode invoked from AliReconstruction::RunTracking() to load HMPID clusters before PropagateBack() gets control. Done once per event.
  94 // Arguments: pCluTree- pointer to clusters tree got by AliHMPIDLoader::LoadRecPoints("read") then AliHMPIDLoader::TreeR()
  95 //   Returns: error code (currently ignored in AliReconstruction::RunTraking())
  96   for(int i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++) pCluTree->SetBranchAddress(Form("HMPID%d",i),&((*fClu)[i]));
  97   pCluTree->GetEntry(0);
  98   return 0;
  99 }//LoadClusters()
 100 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 101 Int_t AliHMPIDTracker::PropagateBack(AliESDEvent *pEsd)
 102 {
 103 // Interface pure virtual in AliTracker. Invoked from AliReconstruction::RunTracking() after invocation of AliTracker::LoadClusters() once per event
 104 // Agruments: pEsd - pointer to ESD
 105 //   Returns: error code
 106   AliCDBEntry *pNmeanEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Nmean"); //contains TObjArray of 42 TF1 + 1 EPhotMean
 107   AliCDBEntry *pQthreEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Qthre"); //contains TObjArray of 42 (7ch * 6sec) TF1
 108   if(!pNmeanEnt) AliError("No Nmean C6F14 ");
 109   if(!pQthreEnt) AliError("No Qthre");
 110
 111   return Recon(pEsd,fClu,(TObjArray*)pNmeanEnt->GetObject(),(TObjArray*)pQthreEnt->GetObject());
 112 }//PropagateBack()
 113 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 114 Int_t AliHMPIDTracker::Recon(AliESDEvent *pEsd,TObjArray *pClus,TObjArray *pNmean, TObjArray *pQthre)
 115 {
 116 // Static method to reconstruct Theta Ckov for all valid tracks of a given event.
 117 // Arguments: pEsd- pointer ESD; pClu- pointer to clusters for all chambers; pNmean - pointer to all function Nmean=f(time)
 118 //   Returns: error code, 0 if no errors
 119
 120   AliHMPIDRecon recon;                                                                           //instance of reconstruction class, nothing important in ctor
 121   Float_t xPc,yPc,xRa,yRa,theta,phi;
 122   Double_t cluLORS[2]={0},cluMARS[3]={0},trkMARS[3]={0};
 123 //  Double_t bestcluMARS[3]={0,0,0};
 124   Double_t radClu,radInitTrk;
 125   Int_t nMipClusTot=0;
 126   Double_t d3d=0,dmin=999999,bz=0;
 127   Bool_t isMatched=kFALSE;
 128   Int_t cluSiz=0;
 129   Double_t qthre = 0;   Double_t nmean=0; Int_t cham=0; Int_t hvsec=0;
 130   Int_t index=0;                                                                                //index of the "best" matching cluster
 131   Double_t bestChi2=-1;                                                                         //Chi2 of the "best" matching cluster
 132   Double_t chi2=0;
 133   Int_t nClusCh[AliHMPIDParam::kMaxCh+1];
 134   Bool_t isOkQcut=kFALSE;
 135   Bool_t isOkDcut=kFALSE;
 136
 137   AliHMPIDParam *pParam = AliHMPIDParam::Instance();                                             //Instance of AliHMPIDParam
 138
 139   for(Int_t iTrk=0;iTrk<pEsd->GetNumberOfTracks();iTrk++){                                        //loop on the ESD tracks in the event
 140     isMatched=kFALSE;dmin=999999;bestChi2=99999;chi2=99999;cluSiz=0;                              //init. track matching params
 141     isOkQcut = kFALSE;
 142     AliHMPIDCluster *bestHmpCluster=0x0;                                                          //the best matching cluster
 143     AliESDtrack *pTrk = pEsd->GetTrack(iTrk);                                                     //get reconstructed track
 144     AliHMPIDtrack *hmpTrk = new AliHMPIDtrack(*pTrk);                                             //create a hmpid track to be used for propagation and matching
 145     bz=AliTracker::GetBz();
 146
 147     Int_t ipCh=IntTrkCha(pTrk,xPc,yPc,xRa,yRa,theta,phi);                                        //find the intersected chamber for this track
 148     if(ipCh<0) {                                                                                 //no intersection at all, go after next track
 149       pTrk->SetHMPIDtrk(0,0,0,0);                                                                //no intersection found
 150       pTrk->SetHMPIDcluIdx   (99,99999);                                                         //chamber not found, mip not yet considered
 151       pTrk->SetHMPIDsignal(AliHMPIDRecon::kNotPerformed);                                        //ring reconstruction not yet performed
 152       continue;
 153     }
 154
 155 // track intersects the chamber ipCh: find the MIP
 156
 157     TClonesArray *pMipCluLst=(TClonesArray *)pClus->At(ipCh);                                   //get the list of clusters
 158     nMipClusTot = pMipCluLst->GetEntries();                                                     //total number of clusters in the given chamber
 159     nClusCh[ipCh] = nMipClusTot;
 160
 161     for (Int_t iClu=0; iClu<nMipClusTot;iClu++) {                                               //clusters loop
 162
 163       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pMipCluLst->UncheckedAt(iClu);                    //get the cluster
 164 // evaluate qThre
 165       if(pQthre->GetEntriesFast()==pParam->kMaxCh+1) {                                             // just for backward compatibility
 166         qthre=((TF1*)pQthre->At(pClu->Ch()))->Eval(pEsd->GetTimeStamp());                          //
 167       } else {                                                                                     // in the past just 1 qthre
 168         hvsec = pParam->InHVSector(pClu->Y());                                              //  per chamber
 169         if(hvsec>=0)
 170           qthre=((TF1*)pQthre->At(6*cham+hvsec))->Eval(pEsd->GetTimeStamp());                      //
 171       }                                                                                            //
 172 //
 173       if(pClu->Q()<qthre) continue;                                                                      //charge compartible with MIP clusters
 174       isOkQcut = kTRUE;
 175
 176       cluLORS[0]=pClu->X(); cluLORS[1]=pClu->Y();                                            //get the LORS coordinates of the cluster
 177       pParam->Lors2Mars(ipCh,cluLORS[0],cluLORS[1],cluMARS);              //convert cluster coors. from LORS to MARS
 178       radClu=TMath::Sqrt(cluMARS[0]*cluMARS[0]+cluMARS[1]*cluMARS[1]);                       //radial distance of candidate cluster in MARS
 179       Double_t trkx0[3];
 180       hmpTrk->GetXYZ(trkx0);                                                                 //get track position in MARS
 181       radInitTrk=TMath::Sqrt(trkx0[0]*trkx0[0]+trkx0[1]*trkx0[1]);
 182       hmpTrk->PropagateToR(radClu,10);
 183       hmpTrk->GetXYZ(trkx0);                                                                   //get track position in MARS
 184       hmpTrk->GetXYZAt(radClu,bz,trkMARS);                                                     //get the track coordinates at the rad distance after prop.
 185       d3d=TMath::Sqrt((cluMARS[0]-trkMARS[0])*(cluMARS[0]-trkMARS[0])+(cluMARS[1]-trkMARS[1])*(cluMARS[1]-trkMARS[1])+(cluMARS[2]-trkMARS[2])*(cluMARS[2]-trkMARS[2]));
 186       chi2=hmpTrk->GetPredictedChi2(pClu);
 187       if(dmin > d3d ) {                                                                         //to be saved for the moment...
 188         cluSiz = pClu->Size();
 189         dmin=d3d;
 190         bestHmpCluster=pClu;
 191         index=iClu;
 192         bestChi2=chi2;
 193         cluLORS[0]=pClu->X(); cluLORS[1]=pClu->Y();
 194 //        pParam->Lors2Mars(ipCh,cluLORS[0],cluLORS[1],bestcluMARS);
 195       }//global dmin cut
 196     }//clus loop
 197
 198     pTrk->SetHMPIDmip(0,0,0,0);                                                                //store mip info in any case
 199
 200     if(!isOkQcut) {
 201       pTrk->SetHMPIDcluIdx(ipCh,9999);
 202       pTrk->SetHMPIDsignal(pParam->kMipQdcCut);
 203       continue;
 204     }
 205
 206     if(dmin < pParam->DistCut()) {
 207       isOkDcut = kTRUE;
 208     }
 209
 210     if(!isOkDcut) {
 211       pTrk->SetHMPIDmip(bestHmpCluster->X(),bestHmpCluster->Y(),(Int_t)bestHmpCluster->Q(),0);  //store mip info in any case
 212       pTrk->SetHMPIDcluIdx(ipCh,index+1000*cluSiz);                                             //set chamber, index of cluster + cluster size
 213       pTrk->SetHMPIDsignal(pParam->kMipDistCut);                                                //closest cluster with enough charge is still too far from intersection
 214     }
 215
 216     if(isOkQcut*isOkDcut) isMatched = kTRUE;                                                    // MIP-Track matched !!
 217
 218     if(!isMatched) continue;                                                                    // If matched continue...
 219
 220     Int_t indexAll = 0;
 221     for(Int_t iC=0;iC<ipCh;iC++) indexAll+=nClusCh[iC]; indexAll+=index;                        //to be verified...
 222
 223     Bool_t isOk = hmpTrk->Update(bestHmpCluster,bestChi2,indexAll);
 224     if(!isOk) continue;
 225     pTrk->SetOuterParam(hmpTrk,AliESDtrack::kHMPIDout);
 226
 227 //    cham=IntTrkCha(ipCh,hmpTrk,xPc,yPc,xRa,yRa,theta,phi);
 228     cham=IntTrkCha(pTrk,xPc,yPc,xRa,yRa,theta,phi);
 229     if(cham<0) {                                                                                  //no intersection at all, go after next track
 230       pTrk->SetHMPIDtrk(0,0,0,0);                                                                //no intersection found
 231       pTrk->SetHMPIDcluIdx   (99,99999);                                                         //chamber not found, mip not yet considered
 232       pTrk->SetHMPIDsignal(AliHMPIDRecon::kNotPerformed);                                        //ring reconstruction not yet performed
 233       continue;
 234     }
 235
 236     pTrk->SetHMPIDtrk(xRa,yRa,theta,phi);                                                        //store initial infos
 237     //evaluate nMean
 238     if(pNmean->GetEntries()==21) {                                                              //for backward compatibility
 239       nmean=((TF1*)pNmean->At(3*cham))->Eval(pEsd->GetTimeStamp());                             //C6F14 Nmean for this chamber
 240     } else {
 241       Int_t iRad     = pParam->Radiator(yRa);                                                   //evaluate the radiator involved
 242       if(iRad < 0) {
 243         nmean = -1;
 244       } else {
 245       Double_t tLow  = ((TF1*)pNmean->At(6*cham+2*iRad  ))->Eval(pEsd->GetTimeStamp());         //C6F14 low  temp for this chamber
 246       Double_t tHigh = ((TF1*)pNmean->At(6*cham+2*iRad+1))->Eval(pEsd->GetTimeStamp());         //C6F14 high temp for this chamber
 247       Double_t tExp  = pParam->FindTemp(tLow,tHigh,yRa);                                        //estimated temp for that chamber at that y
 248       nmean = pParam->NIdxRad(AliHMPIDParam::Instance()->GetEPhotMean(),tExp);                  //mean ref idx @ a given temp
 249       }
 250       if(nmean < 0){                                                                            //track didn' t pass through the radiator
 251          pTrk->SetHMPIDsignal(AliHMPIDRecon::kNoRad);                                           //set the appropriate flag
 252          pTrk->SetHMPIDcluIdx(ipCh,index+1000*cluSiz);                                          //set index of cluster
 253          continue;
 254       }
 255     }
 256     //
 257     recon.SetImpPC(xPc,yPc);                                                                     //store track impact to PC
 258     recon.CkovAngle(pTrk,(TClonesArray *)pClus->At(cham),index,nmean);                           //search for Cerenkov angle of this track
 259
 260     AliHMPIDPid pID;
 261     Double_t prob[5];
 262     pID.FindPid(pTrk,5,prob);
 263     pTrk->SetHMPIDpid(prob);
 264 //      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);
 265
 266   }//iTrk
 267
 268   return 0; // error code: 0=no error;
 269 }//Recon()
 270 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 271 Int_t AliHMPIDTracker::ReconHiddenTrk(AliESDEvent *pEsd,TObjArray *pClus,TObjArray *pNmean, TObjArray *pQthre)
 272 {
 273 // Static method to reconstruct Theta Ckov for all valid tracks of a given event.
 274 // 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)
 275 //   Returns: error code, 0 if no errors
 276
 277   AliHMPIDReconHTA reconHTA;                                                                     //instance of reconstruction class, nothing important in ctor
 278
 279   AliHMPIDParam *pParam = AliHMPIDParam::Instance();                                             //Instance of AliHMPIDParam
 280
 281   for(Int_t iTrk=0;iTrk<pEsd->GetNumberOfTracks();iTrk++){                                        //loop on the ESD tracks in the event
 282
 283     AliESDtrack *pTrk = pEsd->GetTrack(iTrk);                                                     //here it is simulated or just empty track
 284     Int_t ipCh;
 285     ipCh = pTrk->GetHMPIDcluIdx();ipCh/=1000000;
 286     if(ipCh<0) continue;
 287
 288     TClonesArray *pMipCluLst=(TClonesArray *)pClus->At(ipCh);                                   //get the list of clusters
 289     Int_t nMipClusTot = pMipCluLst->GetEntries();                                               //total number of clusters in the given chamber
 290
 291     Double_t qMip=-1;
 292     Int_t chMip=-1;
 293     Double_t xMip = 0;
 294     Double_t yMip = 0;
 295     Int_t indMip  = 0;
 296     Int_t cluMipSiz = 0;
 297
 298     for (Int_t iClu=0; iClu<nMipClusTot;iClu++) {                                               //clusters loop
 299
 300       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pMipCluLst->UncheckedAt(iClu);                    //get the cluster
 301       Double_t qClus = pClu->Q();
 302       if(qClus>qMip) {
 303         qMip  = qClus;
 304         chMip = pClu->Ch();
 305         xMip = pClu->X();
 306         yMip = pClu->Y();
 307         indMip = iClu;
 308         cluMipSiz = pClu->Size();
 309       }
 310     }//clus loop
 311
 312     if(chMip<0) return 1;
 313
 314     Int_t hvsec;
 315     Double_t qthre=0;
 316 // evaluate qThre
 317     if(pQthre->GetEntriesFast()==pParam->kMaxCh+1) {                                              // just for backward compatibility
 318       qthre=((TF1*)pQthre->At(chMip))->Eval(pEsd->GetTimeStamp());                                //
 319     } else {                                                                                      // in the past just 1 qthre
 320       hvsec = pParam->InHVSector(yMip);                                                           //  per chamber
 321       if(hvsec>=0) qthre=((TF1*)pQthre->At(6*chMip+hvsec))->Eval(pEsd->GetTimeStamp());           //
 322     }
 323 //
 324     if(qMip<qthre) {
 325       pTrk->SetHMPIDmip(xMip,yMip,(Int_t)qMip,0);                                                        //store mip info in any case
 326       pTrk->SetHMPIDcluIdx(chMip,indMip+1000*cluMipSiz);
 327       pTrk->SetHMPIDsignal(pParam->kMipQdcCut);
 328       return 1;                                                                                   //charge compatible with MIP clusters
 329     }
 330
 331     pTrk->SetHMPIDmip(xMip,yMip,(Int_t)qMip,0);                                                   //store mip info in any case
 332     pTrk->SetHMPIDcluIdx(chMip,indMip+1000*cluMipSiz);
 333
 334     Double_t yRa = yMip;                                                                        //just an approx...
 335     Double_t nmean;
 336     //evaluate nMean
 337     if(pNmean->GetEntries()==21) {                                                              //for backward compatibility
 338       nmean=((TF1*)pNmean->At(3*chMip))->Eval(pEsd->GetTimeStamp());                            //C6F14 Nmean for this chamber
 339     } else {
 340       Int_t iRad     = pParam->Radiator(yRa);                                                   //evaluate the radiator involved
 341       if(iRad < 0) {
 342         nmean = -1;
 343       } else {
 344       Double_t tLow  = ((TF1*)pNmean->At(6*chMip+2*iRad  ))->Eval(pEsd->GetTimeStamp());        //C6F14 low  temp for this chamber
 345       Double_t tHigh = ((TF1*)pNmean->At(6*chMip+2*iRad+1))->Eval(pEsd->GetTimeStamp());        //C6F14 high temp for this chamber
 346       Double_t tExp  = pParam->FindTemp(tLow,tHigh,yRa);                                        //estimated temp for that chamber at that y
 347       nmean = pParam->NIdxRad(AliHMPIDParam::Instance()->GetEPhotMean(),tExp);                  //mean ref idx @ a given temp
 348       }
 349       if(nmean < 0){                                                                            //track didn' t pass through the radiator
 350          pTrk->SetHMPIDsignal(AliHMPIDRecon::kNoRad);                                           //set the appropriate flag
 351          return 1;
 352       }
 353     }
 354     //
 355     Printf(" qthre %f nmean %f index %i cham %i",qthre,nmean,indMip,chMip);
 356     if(!reconHTA.CkovHiddenTrk(pTrk,(TClonesArray *)pClus->At(ipCh),indMip,nmean)) {                 //search for track parameters and Cerenkov angle of this track
 357       AliHMPIDPid pID;
 358       Double_t prob[5];
 359       pID.FindPid(pTrk,5,prob);
 360       pTrk->SetHMPIDpid(prob);
 361     }
 362 //      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);
 363   }//iTrk
 364
 365   return 0; // error code: 0=no error;
 366
 367 }//Recon()
 368 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 369 void AliHMPIDTracker::FillClusterArray(TObjArray* array) const {
 370
 371  // Publishes all pointers to clusters known to the tracker into the
 372   // passed object array.
 373   // The ownership is not transfered - the caller is not expected to delete
 374   // the clusters
 375
 376   for(Int_t iCh=AliHMPIDParam::kMinCh;iCh<=AliHMPIDParam::kMaxCh;iCh++){
 377     TClonesArray *pCluArr=(TClonesArray*)(*fClu)[iCh];
 378     for (Int_t iClu=0; iClu<pCluArr->GetEntriesFast();iClu++){
 379       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pCluArr->UncheckedAt(iClu);
 380       array->AddLast(pClu);
 381     }//cluster loop in iCh
 382     pCluArr->Delete();
 383   }//Ch loop
 384
 385   return;
 386 }
 387 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++