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   iClu = iClu%1000; //GetHMPIDcluIdx -> 1e+6*ch + 1e+3*clusize + cluIdx;
  43   point.SetVolumeID(AliGeomManager::LayerToVolUID(AliGeomManager::kHMPID,iCham));//layer and chamber number
  44   TClonesArray *pArr=(TClonesArray*)(*fClu)[iCham];
  45   AliHMPIDCluster *pClu=(AliHMPIDCluster*)pArr->UncheckedAt(iClu);//get pointer to cluster
  46   Float_t xyz[3];
  47   pClu->GetGlobalXYZ(xyz);
  48   Float_t cov[6];
  49   pClu->GetGlobalCov(cov);
  50   point.SetXYZ(xyz,cov);
  51   return kTRUE;
  52 }//GetTrackPoint()
  53 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  54 Int_t AliHMPIDTracker::IntTrkCha(AliESDtrack *pTrk,Float_t &xPc,Float_t &yPc,Float_t &xRa,Float_t &yRa,Float_t &theta,Float_t &phi)
  55 {
  56 // Static method to find intersection in between given track and HMPID chambers
  57 // Arguments: pTrk- ESD track; xPc,yPc- track intersection with PC in LORS [cm]
  58 //   Returns: intersected chamber ID or -1
  59   AliHMPIDtrack *hmpTrk = new AliHMPIDtrack(*pTrk);                                             //create a hmpid track to be used for propagation and matching
  60   for(Int_t i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++){                              //chambers loop
  61     Int_t chInt = IntTrkCha(i,hmpTrk,xPc,yPc,xRa,yRa,theta,phi);
  62     if(chInt>=0) {delete hmpTrk;hmpTrk=0x0;return chInt;}
  63   }                                                                                             //chambers loop
  64   delete hmpTrk; hmpTrk=0x0;
  65   return -1;                                                                                    //no intersection with HMPID chambers
  66 }//IntTrkCha()
  67 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  68 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)
  69 {
  70 // Static method to find intersection in between given track and HMPID chambers
  71 // Arguments: pTrk- HMPID track; xPc,yPc- track intersection with PC in LORS [cm]
  72 //   Returns: intersected chamber ID or -1
  73     AliHMPIDParam *pParam=AliHMPIDParam::Instance();
  74     Double_t p1[3],n1[3];
  75     pParam->Norm(ch,n1);
  76     pParam->Point(ch,p1,AliHMPIDParam::kRad);                                                    //point & norm  for middle of radiator plane
  77     Double_t p2[3],n2[3];
  78     pParam->Norm(ch,n2);
  79     pParam->Point(ch,p2,AliHMPIDParam::kPc);                                                     //point & norm  for entrance to PC plane
  80     if(pTrk->Intersect(p1,n1)==kFALSE) return -1;                                                //try to intersect track with the middle of radiator
  81     if(pTrk->Intersect(p2,n2)==kFALSE) return -1;
  82     pParam->Mars2LorsVec(ch,n1,theta,phi);                                                       //track angles at RAD
  83     pParam->Mars2Lors   (ch,p1,xRa,yRa);                                                         //TRKxRAD position
  84     pParam->Mars2Lors   (ch,p2,xPc,yPc);                                                         //TRKxPC position
  85     if(AliHMPIDParam::IsInside(xPc,yPc,pParam->DistCut())==kTRUE) return ch;                     //return intersected chamber
  86   return -1;                                                                                     //no intersection with HMPID chambers
  87 }//IntTrkCha()
  88 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  89 Int_t AliHMPIDTracker::LoadClusters(TTree *pCluTree)
  90 {
  91 // Interface callback methode invoked from AliReconstruction::RunTracking() to load HMPID clusters before PropagateBack() gets control. Done once per event.
  92 // Arguments: pCluTree- pointer to clusters tree got by AliHMPIDLoader::LoadRecPoints("read") then AliHMPIDLoader::TreeR()
  93 //   Returns: error code (currently ignored in AliReconstruction::RunTraking())
  94   for(int i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++) pCluTree->SetBranchAddress(Form("HMPID%d",i),&((*fClu)[i]));
  95   pCluTree->GetEntry(0);
  96   return 0;
  97 }//LoadClusters()
  98 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  99 Int_t AliHMPIDTracker::PropagateBack(AliESDEvent *pEsd)
 100 {
 101 // Interface pure virtual in AliTracker. Invoked from AliReconstruction::RunTracking() after invocation of AliTracker::LoadClusters() once per event
 102 // Agruments: pEsd - pointer to ESD
 103 //   Returns: error code
 104   AliCDBEntry *pNmeanEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Nmean"); //contains TObjArray of 42 TF1 + 1 EPhotMean
 105   AliCDBEntry *pQthreEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Qthre"); //contains TObjArray of 42 (7ch * 6sec) TF1
 106   if(!pNmeanEnt) AliError("No Nmean C6F14 ");
 107   if(!pQthreEnt) AliError("No Qthre");
 108
 109   return Recon(pEsd,fClu,(TObjArray*)pNmeanEnt->GetObject(),(TObjArray*)pQthreEnt->GetObject());
 110 }//PropagateBack()
 111 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 112 Int_t AliHMPIDTracker::Recon(AliESDEvent *pEsd,TObjArray *pClus,TObjArray *pNmean, TObjArray *pQthre)
 113 {
 114 // Static method to reconstruct Theta Ckov for all valid tracks of a given event.
 115 // Arguments: pEsd- pointer ESD; pClu- pointer to clusters for all chambers; pNmean - pointer to all function Nmean=f(time)
 116 //   Returns: error code, 0 if no errors
 117
 118   AliHMPIDRecon recon;                                                                           //instance of reconstruction class, nothing important in ctor
 119   Float_t xPc,yPc,xRa,yRa,theta,phi;
 120   Double_t cluLORS[2]={0};
 121 //  Double_t cluMARS[3]={0},trkMARS[3]={0};
 122 //  Double_t bestcluMARS[3]={0,0,0};
 123 //  Double_t radClu,radInitTrk;
 124   Int_t nMipClusTot=0;
 125 //  Double_t d3d=0;
 126   Double_t qthre = 0;   Double_t nmean=0; Int_t hvsec=0;
 127   Int_t nClusCh[AliHMPIDParam::kMaxCh+1];
 128
 129   AliHMPIDParam *pParam = AliHMPIDParam::Instance();                                             //Instance of AliHMPIDParam
 130
 131   for(Int_t iTrk=0;iTrk<pEsd->GetNumberOfTracks();iTrk++){                                        //loop on the ESD tracks in the event
 132
 133 //    Double_t bestChi2=99999;chi2=99999;                                                          //init. track matching params
 134     Double_t dmin=999999,bz=0;
 135
 136     Bool_t isOkDcut=kFALSE;
 137     Bool_t isOkQcut=kFALSE;
 138     Bool_t isMatched=kFALSE;
 139
 140     AliHMPIDCluster *bestHmpCluster=0x0;                                                          //the best matching cluster
 141     AliESDtrack *pTrk = pEsd->GetTrack(iTrk);                                                     //get reconstructed track
 142     AliHMPIDtrack *hmpTrk = new AliHMPIDtrack(*pTrk);                                             //create a hmpid track to be used for propagation and matching
 143     bz=AliTracker::GetBz();
 144 //initial flags for HMPID ESD infos
 145     pTrk->SetHMPIDtrk(0,0,0,0);                                                                //no intersection found
 146     pTrk->SetHMPIDmip(0,0,0,0);                                                                //store mip info in any case
 147     pTrk->SetHMPIDcluIdx(99,99999);                                                            //chamber not found, mip not yet considered
 148     pTrk->SetHMPIDsignal(AliHMPIDRecon::kNotPerformed);                                        //ring reconstruction not yet performed
 149
 150     Int_t ipCh=IntTrkCha(pTrk,xPc,yPc,xRa,yRa,theta,phi);                                        //find the intersected chamber for this track
 151
 152     if(ipCh<0) continue;                                                                         //no intersection at all, go after next track
 153
 154     pTrk->SetHMPIDtrk(xPc,yPc,theta,phi);                                                        //store initial infos
 155     pTrk->SetHMPIDcluIdx(ipCh,9999);                                                             //set chamber, index of cluster + cluster size
 156
 157 // track intersects the chamber ipCh: find the MIP
 158
 159     TClonesArray *pMipCluLst=(TClonesArray *)pClus->At(ipCh);                                   //get the list of clusters
 160     nMipClusTot = pMipCluLst->GetEntries();                                                     //total number of clusters in the given chamber
 161     nClusCh[ipCh] = nMipClusTot;
 162
 163     if(nMipClusTot==0) continue;
 164
 165     Int_t index=-1;                                                                             //index of the "best" matching cluster
 166
 167     for (Int_t iClu=0; iClu<nMipClusTot;iClu++) {                                               //clusters loop
 168
 169       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pMipCluLst->UncheckedAt(iClu);                    //get the cluster
 170 // evaluate qThre
 171       if(pQthre->GetEntriesFast()==pParam->kMaxCh+1) {                                             // just for backward compatibility
 172         qthre=((TF1*)pQthre->At(pClu->Ch()))->Eval(pEsd->GetTimeStamp());                          //
 173       } else {                                                                                     // in the past just 1 qthre
 174         hvsec = pParam->InHVSector(pClu->Y());                                              //  per chamber
 175         if(hvsec>=0)
 176           qthre=((TF1*)pQthre->At(6*ipCh+hvsec))->Eval(pEsd->GetTimeStamp());                      //
 177       }                                                                                            //
 178 //
 179       if(pClu->Q()<qthre) continue;                                                                      //charge compartible with MIP clusters
 180       isOkQcut = kTRUE;
 181 //
 182       cluLORS[0]=pClu->X(); cluLORS[1]=pClu->Y();                                            //get the LORS coordinates of the cluster
 183       Double_t dist = TMath::Sqrt((xPc-cluLORS[0])*(xPc-cluLORS[0])+(yPc-cluLORS[1])*(yPc-cluLORS[1]));
 184
 185       if(dist<dmin) {
 186         dmin = dist;
 187         index=iClu;
 188         bestHmpCluster=pClu;
 189       }
 190     }
 191 /*
 192       pParam->Lors2Mars(ipCh,cluLORS[0],cluLORS[1],cluMARS);              //convert cluster coors. from LORS to MARS
 193       radClu=TMath::Sqrt(cluMARS[0]*cluMARS[0]+cluMARS[1]*cluMARS[1]);                       //radial distance of candidate cluster in MARS
 194       Double_t trkx0[3];
 195       hmpTrk->GetXYZ(trkx0);                                                                 //get track position in MARS
 196       radInitTrk=TMath::Sqrt(trkx0[0]*trkx0[0]+trkx0[1]*trkx0[1]);
 197       hmpTrk->PropagateToR(radClu,10);
 198       hmpTrk->GetXYZ(trkx0);                                                                   //get track position in MARS
 199       hmpTrk->GetXYZAt(radClu,bz,trkMARS);                                                     //get the track coordinates at the rad distance after prop.
 200       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]));
 201       chi2=hmpTrk->GetPredictedChi2(pClu);
 202       if(dmin > d3d ) {   +                                                                      //to be saved for the moment...
 203         cluSiz = pClu->Size();
 204         dmin=d3d;
 205         bestHmpCluster=pClu;
 206         index=iClu;
 207         bestChi2=chi2;
 208         cluLORS[0]=pClu->X(); cluLORS[1]=pClu->Y();
 209 //        pParam->Lors2Mars(ipCh,cluLORS[0],cluLORS[1],bestcluMARS);
 210       }//global dmin cut
 211     }//clus loop
 212 */
 213     if(!isOkQcut) {
 214       pTrk->SetHMPIDsignal(pParam->kMipQdcCut);
 215       continue;
 216     }
 217
 218     Int_t cluSiz = bestHmpCluster->Size();
 219     pTrk->SetHMPIDmip(bestHmpCluster->X(),bestHmpCluster->Y(),(Int_t)bestHmpCluster->Q(),0);  //store mip info in any case
 220     pTrk->SetHMPIDcluIdx(ipCh,index+1000*cluSiz);                                             //set chamber, index of cluster + cluster size
 221
 222     if(dmin < pParam->DistCut()) {
 223       isOkDcut = kTRUE;
 224     }
 225
 226     if(!isOkDcut) {
 227       pTrk->SetHMPIDsignal(pParam->kMipDistCut);                                                //closest cluster with enough charge is still too far from intersection
 228     }
 229
 230     if(isOkQcut*isOkDcut) isMatched = kTRUE;                                                    // MIP-Track matched !!
 231
 232     if(!isMatched) continue;                                                                    // If matched continue...
 233
 234     Bool_t isOk = hmpTrk->Update(bestHmpCluster,0.1,0);
 235     if(!isOk) continue;
 236     pTrk->SetOuterParam(hmpTrk,AliESDtrack::kHMPIDout);
 237
 238     /*
 239     Int_t indexAll = 0;
 240     for(Int_t iC=0;iC<ipCh;iC++) indexAll+=nClusCh[iC]; indexAll+=index;                        //to be verified...
 241
 242     Bool_t isOk = hmpTrk->Update(bestHmpCluster,bestChi2,indexAll);
 243     if(!isOk) continue;
 244     pTrk->SetOuterParam(hmpTrk,AliESDtrack::kHMPIDout);
 245
 246     cham=IntTrkCha(pTrk,xPc,yPc,xRa,yRa,theta,phi);
 247
 248     if(cham<0) {                                                                                  //no intersection at all, go after next track
 249       pTrk->SetHMPIDtrk(0,0,0,0);                                                                //no intersection found
 250       pTrk->SetHMPIDcluIdx   (99,99999);                                                         //chamber not found, mip not yet considered
 251       pTrk->SetHMPIDsignal(AliHMPIDRecon::kNotPerformed);                                        //ring reconstruction not yet performed
 252       continue;
 253     }
 254 */
 255     //evaluate nMean
 256     if(pNmean->GetEntries()==21) {                                                              //for backward compatibility
 257       nmean=((TF1*)pNmean->At(3*ipCh))->Eval(pEsd->GetTimeStamp());                             //C6F14 Nmean for this chamber
 258     } else {
 259       Int_t iRad     = pParam->Radiator(yRa);                                                   //evaluate the radiator involved
 260       if(iRad < 0) {
 261         nmean = -1;
 262       } else {
 263       Double_t tLow  = ((TF1*)pNmean->At(6*ipCh+2*iRad  ))->Eval(pEsd->GetTimeStamp());         //C6F14 low  temp for this chamber
 264       Double_t tHigh = ((TF1*)pNmean->At(6*ipCh+2*iRad+1))->Eval(pEsd->GetTimeStamp());         //C6F14 high temp for this chamber
 265       Double_t tExp  = pParam->FindTemp(tLow,tHigh,yRa);                                        //estimated temp for that chamber at that y
 266       nmean = pParam->NIdxRad(AliHMPIDParam::Instance()->GetEPhotMean(),tExp);                  //mean ref idx @ a given temp
 267       }
 268       if(nmean < 0){                                                                            //track didn' t pass through the radiator
 269          pTrk->SetHMPIDsignal(AliHMPIDRecon::kNoRad);                                           //set the appropriate flag
 270          pTrk->SetHMPIDcluIdx(ipCh,index+1000*cluSiz);                                          //set index of cluster
 271          continue;
 272       }
 273     }
 274     //
 275     recon.SetImpPC(xPc,yPc);                                                                     //store track impact to PC
 276     recon.CkovAngle(pTrk,(TClonesArray *)pClus->At(ipCh),index,nmean,xRa,yRa);                   //search for Cerenkov angle of this track
 277
 278     AliHMPIDPid pID;
 279     Double_t prob[5];
 280     pID.FindPid(pTrk,5,prob);
 281     pTrk->SetHMPIDpid(prob);
 282 //      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);
 283
 284     delete hmpTrk;hmpTrk=0x0;
 285   }//iTrk
 286
 287   return 0; // error code: 0=no error;
 288 }//Recon()
 289 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 290 Int_t AliHMPIDTracker::ReconHiddenTrk(AliESDEvent *pEsd,TObjArray *pClus,TObjArray *pNmean, TObjArray *pQthre)
 291 {
 292 // Static method to reconstruct Theta Ckov for all valid tracks of a given event.
 293 // 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)
 294 //   Returns: error code, 0 if no errors
 295
 296   AliHMPIDReconHTA reconHTA;                                                                     //instance of reconstruction class, nothing important in ctor
 297
 298   AliHMPIDParam *pParam = AliHMPIDParam::Instance();                                             //Instance of AliHMPIDParam
 299
 300   for(Int_t iTrk=0;iTrk<pEsd->GetNumberOfTracks();iTrk++){                                        //loop on the ESD tracks in the event
 301
 302     AliESDtrack *pTrk = pEsd->GetTrack(iTrk);                                                     //here it is simulated or just empty track
 303     Int_t ipCh;
 304     ipCh = pTrk->GetHMPIDcluIdx();ipCh/=1000000;
 305     if(ipCh<0) continue;
 306
 307     TClonesArray *pMipCluLst=(TClonesArray *)pClus->At(ipCh);                                   //get the list of clusters
 308     Int_t nMipClusTot = pMipCluLst->GetEntries();                                               //total number of clusters in the given chamber
 309
 310     Double_t qMip=-1;
 311     Int_t chMip=-1;
 312     Double_t xMip = 0;
 313     Double_t yMip = 0;
 314     Int_t indMip  = 0;
 315     Int_t cluMipSiz = 0;
 316
 317     for (Int_t iClu=0; iClu<nMipClusTot;iClu++) {                                               //clusters loop
 318
 319       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pMipCluLst->UncheckedAt(iClu);                    //get the cluster
 320       Double_t qClus = pClu->Q();
 321       if(qClus>qMip) {
 322         qMip  = qClus;
 323         chMip = pClu->Ch();
 324         xMip = pClu->X();
 325         yMip = pClu->Y();
 326         indMip = iClu;
 327         cluMipSiz = pClu->Size();
 328       }
 329     }//clus loop
 330
 331     if(chMip<0) return 1;
 332
 333     Int_t hvsec;
 334     Double_t qthre=0;
 335 // evaluate qThre
 336     if(pQthre->GetEntriesFast()==pParam->kMaxCh+1) {                                              // just for backward compatibility
 337       qthre=((TF1*)pQthre->At(chMip))->Eval(pEsd->GetTimeStamp());                                //
 338     } else {                                                                                      // in the past just 1 qthre
 339       hvsec = pParam->InHVSector(yMip);                                                           //  per chamber
 340       if(hvsec>=0) qthre=((TF1*)pQthre->At(6*chMip+hvsec))->Eval(pEsd->GetTimeStamp());           //
 341     }
 342 //
 343     if(qMip<qthre) {
 344       pTrk->SetHMPIDmip(xMip,yMip,(Int_t)qMip,0);                                                        //store mip info in any case
 345       pTrk->SetHMPIDcluIdx(chMip,indMip+1000*cluMipSiz);
 346       pTrk->SetHMPIDsignal(pParam->kMipQdcCut);
 347       return 1;                                                                                   //charge compatible with MIP clusters
 348     }
 349
 350     pTrk->SetHMPIDmip(xMip,yMip,(Int_t)qMip,0);                                                   //store mip info in any case
 351     pTrk->SetHMPIDcluIdx(chMip,indMip+1000*cluMipSiz);
 352
 353     Double_t yRa = yMip;                                                                        //just an approx...
 354     Double_t nmean;
 355     //evaluate nMean
 356     if(pNmean->GetEntries()==21) {                                                              //for backward compatibility
 357       nmean=((TF1*)pNmean->At(3*chMip))->Eval(pEsd->GetTimeStamp());                            //C6F14 Nmean for this chamber
 358     } else {
 359       Int_t iRad     = pParam->Radiator(yRa);                                                   //evaluate the radiator involved
 360       if(iRad < 0) {
 361         nmean = -1;
 362       } else {
 363       Double_t tLow  = ((TF1*)pNmean->At(6*chMip+2*iRad  ))->Eval(pEsd->GetTimeStamp());        //C6F14 low  temp for this chamber
 364       Double_t tHigh = ((TF1*)pNmean->At(6*chMip+2*iRad+1))->Eval(pEsd->GetTimeStamp());        //C6F14 high temp for this chamber
 365       Double_t tExp  = pParam->FindTemp(tLow,tHigh,yRa);                                        //estimated temp for that chamber at that y
 366       nmean = pParam->NIdxRad(AliHMPIDParam::Instance()->GetEPhotMean(),tExp);                  //mean ref idx @ a given temp
 367       }
 368       if(nmean < 0){                                                                            //track didn' t pass through the radiator
 369          pTrk->SetHMPIDsignal(AliHMPIDRecon::kNoRad);                                           //set the appropriate flag
 370          return 1;
 371       }
 372     }
 373     //
 374     if(!reconHTA.CkovHiddenTrk(pTrk,(TClonesArray *)pClus->At(ipCh),indMip,nmean)) {                 //search for track parameters and Cerenkov angle of this track
 375       AliHMPIDPid pID;
 376       Double_t prob[5];
 377       pID.FindPid(pTrk,5,prob);
 378       pTrk->SetHMPIDpid(prob);
 379     }
 380 //      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);
 381   }//iTrk
 382
 383   return 0; // error code: 0=no error;
 384
 385 }//Recon()
 386 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 387 void AliHMPIDTracker::FillClusterArray(TObjArray* array) const {
 388
 389  // Publishes all pointers to clusters known to the tracker into the
 390   // passed object array.
 391   // The ownership is not transfered - the caller is not expected to delete
 392   // the clusters
 393
 394   for(Int_t iCh=AliHMPIDParam::kMinCh;iCh<=AliHMPIDParam::kMaxCh;iCh++){
 395     TClonesArray *pCluArr=(TClonesArray*)(*fClu)[iCh];
 396     for (Int_t iClu=0; iClu<pCluArr->GetEntriesFast();iClu++){
 397       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pCluArr->UncheckedAt(iClu);
 398       array->AddLast(pClu);
 399     }//cluster loop in iCh
 400     pCluArr->Delete();
 401   }//Ch loop
 402
 403   return;
 404 }
 405 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++