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   AliHMPIDParam *pParam=AliHMPIDParam::Instance();
  60   for(Int_t i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++){                              //chambers loop
  61     Double_t p1[3],n1[3]; pParam->Norm(i,n1); pParam->Point(i,p1,AliHMPIDParam::kRad);          //point & norm  for middle of radiator plane
  62     Double_t p2[3],n2[3]; pParam->Norm(i,n2); pParam->Point(i,p2,AliHMPIDParam::kPc);           //point & norm  for entrance to PC plane
  63     if(pTrk->Intersect(p1,n1,-GetBz())==kFALSE) continue;                                       //try to intersect track with the middle of radiator
  64     if(pTrk->Intersect(p2,n2,-GetBz())==kFALSE) continue;                                       //try to intersect track with PC
  65     pParam->Mars2LorsVec(i,n1,theta,phi);                                                       //track angles at RAD
  66     pParam->Mars2Lors   (i,p1,xRa,yRa);                                                         //TRKxRAD position
  67     pParam->Mars2Lors   (i,p2,xPc,yPc);                                                         //TRKxPC position
  68     if(AliHMPIDParam::IsInside(xPc,yPc,pParam->DistCut())==kTRUE) return i;                     //return intersected chamber
  69   }                                                                                             //chambers loop
  70   return -1;                                                                                    //no intersection with HMPID chambers
  71 }//IntTrkCha()
  72 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  73 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)
  74 {
  75 // Static method to find intersection in between given track and HMPID chambers
  76 // Arguments: pTrk- HMPID track; xPc,yPc- track intersection with PC in LORS [cm]
  77 //   Returns: intersected chamber ID or -1
  78     AliHMPIDParam *pParam=AliHMPIDParam::Instance();
  79     Double_t p1[3],n1[3];
  80     pParam->Norm(ch,n1);
  81     pParam->Point(ch,p1,AliHMPIDParam::kRad);                                                    //point & norm  for middle of radiator plane
  82     Double_t p2[3],n2[3];
  83     pParam->Norm(ch,n2);
  84     pParam->Point(ch,p2,AliHMPIDParam::kPc);                                                     //point & norm  for entrance to PC plane
  85     if(pTrk->Intersect(pTrk,p1,n1)==kFALSE) return -1;                                           //try to intersect track with the middle of radiator
  86     if(pTrk->Intersect(pTrk,p2,n2)==kFALSE) return -1;
  87     pParam->Mars2LorsVec(ch,n1,theta,phi);                                                       //track angles at RAD
  88     pParam->Mars2Lors   (ch,p1,xRa,yRa);                                                         //TRKxRAD position
  89     pParam->Mars2Lors   (ch,p2,xPc,yPc);                                                         //TRKxPC position
  90     if(AliHMPIDParam::IsInside(xPc,yPc,pParam->DistCut())==kTRUE) return ch;                     //return intersected chamber
  91   return -1;                                                                                     //no intersection with HMPID chambers
  92 }//IntTrkCha()
  93 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  94 Int_t AliHMPIDTracker::LoadClusters(TTree *pCluTree)
  95 {
  96 // Interface callback methode invoked from AliReconstruction::RunTracking() to load HMPID clusters before PropagateBack() gets control. Done once per event.
  97 // Arguments: pCluTree- pointer to clusters tree got by AliHMPIDLoader::LoadRecPoints("read") then AliHMPIDLoader::TreeR()
  98 //   Returns: error code (currently ignored in AliReconstruction::RunTraking())
  99   for(int i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++) pCluTree->SetBranchAddress(Form("HMPID%d",i),&((*fClu)[i]));
 100   pCluTree->GetEntry(0);
 101   return 0;
 102 }//LoadClusters()
 103 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 104 Int_t AliHMPIDTracker::PropagateBack(AliESDEvent *pEsd)
 105 {
 106 // Interface pure virtual in AliTracker. Invoked from AliReconstruction::RunTracking() after invocation of AliTracker::LoadClusters() once per event
 107 // Agruments: pEsd - pointer to ESD
 108 //   Returns: error code
 109   AliCDBEntry *pNmeanEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Nmean"); //contains TObjArray of 42 TF1 + 1 EPhotMean
 110   AliCDBEntry *pQthreEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Qthre"); //contains TObjArray of 42 (7ch * 6sec) TF1
 111   if(!pNmeanEnt) AliError("No Nmean C6F14 ");
 112   if(!pQthreEnt) AliError("No Qthre");
 113
 114   return Recon(pEsd,fClu,(TObjArray*)pNmeanEnt->GetObject(),(TObjArray*)pQthreEnt->GetObject());
 115 }//PropagateBack()
 116 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 117 Int_t AliHMPIDTracker::Recon(AliESDEvent *pEsd,TObjArray *pClus,TObjArray *pNmean, TObjArray *pQthre)
 118 {
 119 // Static method to reconstruct Theta Ckov for all valid tracks of a given event.
 120 // Arguments: pEsd- pointer ESD; pClu- pointer to clusters for all chambers; pNmean - pointer to all function Nmean=f(time)
 121 //   Returns: error code, 0 if no errors
 122
 123   AliHMPIDRecon recon;                                                                           //instance of reconstruction class, nothing important in ctor
 124   Float_t xPc,yPc,xRa,yRa,theta,phi;
 125   Double_t cluLORS[2]={0},cluMARS[3]={0},trkMARS[3]={0};
 126 //  Double_t bestcluMARS[3]={0,0,0};
 127   Double_t radClu,radInitTrk;
 128   Int_t nMipClusTot=0;
 129   Double_t d3d=0,dmin=999999,bz=0;
 130   Bool_t isMatched=kFALSE;
 131   Int_t cluSiz=0;
 132   Double_t qthre = 0;   Double_t nmean=0; Int_t cham=0; Int_t hvsec=0;
 133   Int_t index=0;                                                                                //index of the "best" matching cluster
 134   Double_t bestChi2=-1;                                                                         //Chi2 of the "best" matching cluster
 135   Double_t chi2=0;
 136   Int_t nClusCh[AliHMPIDParam::kMaxCh+1];
 137   Bool_t isOkQcut=kFALSE;
 138   Bool_t isOkDcut=kFALSE;
 139
 140   AliHMPIDParam *pParam = AliHMPIDParam::Instance();                                             //Instance of AliHMPIDParam
 141
 142   for(Int_t iTrk=0;iTrk<pEsd->GetNumberOfTracks();iTrk++){                                        //loop on the ESD tracks in the event
 143     isMatched=kFALSE;dmin=999999;bestChi2=99999;chi2=99999;cluSiz=0;                              //init. track matching params
 144     isOkQcut = kFALSE;
 145     AliHMPIDCluster *bestHmpCluster=0x0;                                                          //the best matching cluster
 146     AliESDtrack *pTrk = pEsd->GetTrack(iTrk);                                                     //get reconstructed track
 147     AliHMPIDtrack *hmpTrk = new AliHMPIDtrack(*pTrk);                                             //create a hmpid track to be used for propagation and matching
 148     bz=AliTracker::GetBz();
 149
 150     Int_t ipCh=IntTrkCha(pTrk,xPc,yPc,xRa,yRa,theta,phi);                                        //find the intersected chamber for this track
 151     if(ipCh<0) {                                                                                 //no intersection at all, go after next track
 152       pTrk->SetHMPIDtrk(0,0,0,0);                                                                //no intersection found
 153       pTrk->SetHMPIDcluIdx   (99,99999);                                                         //chamber not found, mip not yet considered
 154       pTrk->SetHMPIDsignal(AliHMPIDRecon::kNotPerformed);                                        //ring reconstruction not yet performed
 155       continue;
 156     }
 157
 158 // track intersects the chamber ipCh: find the MIP
 159
 160     TClonesArray *pMipCluLst=(TClonesArray *)pClus->At(ipCh);                                   //get the list of clusters
 161     nMipClusTot = pMipCluLst->GetEntries();                                                     //total number of clusters in the given chamber
 162     nClusCh[ipCh] = nMipClusTot;
 163
 164     for (Int_t iClu=0; iClu<nMipClusTot;iClu++) {                                               //clusters loop
 165
 166       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pMipCluLst->UncheckedAt(iClu);                    //get the cluster
 167 // evaluate qThre
 168       if(pQthre->GetEntriesFast()==pParam->kMaxCh+1) {                                             // just for backward compatibility
 169         qthre=((TF1*)pQthre->At(pClu->Ch()))->Eval(pEsd->GetTimeStamp());                          //
 170       } else {                                                                                     // in the past just 1 qthre
 171         hvsec = pParam->InHVSector(pClu->Y());                                              //  per chamber
 172         if(hvsec>=0)
 173           qthre=((TF1*)pQthre->At(6*cham+hvsec))->Eval(pEsd->GetTimeStamp());                      //
 174       }                                                                                            //
 175 //
 176       if(pClu->Q()<qthre) continue;                                                                      //charge compartible with MIP clusters
 177       isOkQcut = kTRUE;
 178
 179       cluLORS[0]=pClu->X(); cluLORS[1]=pClu->Y();                                            //get the LORS coordinates of the cluster
 180       pParam->Lors2Mars(ipCh,cluLORS[0],cluLORS[1],cluMARS);              //convert cluster coors. from LORS to MARS
 181       radClu=TMath::Sqrt(cluMARS[0]*cluMARS[0]+cluMARS[1]*cluMARS[1]);                       //radial distance of candidate cluster in MARS
 182       Double_t trkx0[3];
 183       hmpTrk->GetXYZ(trkx0);                                                                 //get track position in MARS
 184       radInitTrk=TMath::Sqrt(trkx0[0]*trkx0[0]+trkx0[1]*trkx0[1]);
 185       hmpTrk->PropagateToR(radClu,10);
 186       hmpTrk->GetXYZ(trkx0);                                                                   //get track position in MARS
 187       hmpTrk->GetXYZAt(radClu,bz,trkMARS);                                                     //get the track coordinates at the rad distance after prop.
 188       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]));
 189       chi2=hmpTrk->GetPredictedChi2(pClu);
 190       if(dmin > d3d ) {                                                                         //to be saved for the moment...
 191         cluSiz = pClu->Size();
 192         dmin=d3d;
 193         bestHmpCluster=pClu;
 194         index=iClu;
 195         bestChi2=chi2;
 196         cluLORS[0]=pClu->X(); cluLORS[1]=pClu->Y();
 197 //        pParam->Lors2Mars(ipCh,cluLORS[0],cluLORS[1],bestcluMARS);
 198       }//global dmin cut
 199     }//clus loop
 200
 201     pTrk->SetHMPIDmip(0,0,0,0);                                                                //store mip info in any case
 202
 203     if(!isOkQcut) {
 204       pTrk->SetHMPIDcluIdx(ipCh,9999);
 205       pTrk->SetHMPIDsignal(pParam->kMipQdcCut);
 206       continue;
 207     }
 208
 209     if(dmin < pParam->DistCut()) {
 210       isOkDcut = kTRUE;
 211     }
 212
 213     if(!isOkDcut) {
 214       pTrk->SetHMPIDmip(bestHmpCluster->X(),bestHmpCluster->Y(),(Int_t)bestHmpCluster->Q(),0);  //store mip info in any case
 215       pTrk->SetHMPIDcluIdx(ipCh,index+1000*cluSiz);                                             //set chamber, index of cluster + cluster size
 216       pTrk->SetHMPIDsignal(pParam->kMipDistCut);                                                //closest cluster with enough charge is still too far from intersection
 217     }
 218
 219     if(isOkQcut*isOkDcut) isMatched = kTRUE;                                                    // MIP-Track matched !!
 220
 221     if(!isMatched) continue;                                                                    // If matched continue...
 222
 223     Int_t indexAll = 0;
 224     for(Int_t iC=0;iC<ipCh;iC++) indexAll+=nClusCh[iC]; indexAll+=index;                        //to be verified...
 225
 226     Bool_t isOk = hmpTrk->Update(bestHmpCluster,bestChi2,indexAll);
 227     if(!isOk) continue;
 228     pTrk->SetOuterParam(hmpTrk,AliESDtrack::kHMPIDout);
 229
 230 //    cham=IntTrkCha(ipCh,hmpTrk,xPc,yPc,xRa,yRa,theta,phi);
 231     cham=IntTrkCha(pTrk,xPc,yPc,xRa,yRa,theta,phi);
 232     if(cham<0) {                                                                                  //no intersection at all, go after next track
 233       pTrk->SetHMPIDtrk(0,0,0,0);                                                                //no intersection found
 234       pTrk->SetHMPIDcluIdx   (99,99999);                                                         //chamber not found, mip not yet considered
 235       pTrk->SetHMPIDsignal(AliHMPIDRecon::kNotPerformed);                                        //ring reconstruction not yet performed
 236       continue;
 237     }
 238
 239     pTrk->SetHMPIDtrk(xRa,yRa,theta,phi);                                                        //store initial infos
 240     //evaluate nMean
 241     if(pNmean->GetEntries()==21) {                                                              //for backward compatibility
 242       nmean=((TF1*)pNmean->At(3*cham))->Eval(pEsd->GetTimeStamp());                             //C6F14 Nmean for this chamber
 243     } else {
 244       Int_t iRad     = pParam->Radiator(yRa);                                                   //evaluate the radiator involved
 245       if(iRad < 0) {
 246         nmean = -1;
 247       } else {
 248       Double_t tLow  = ((TF1*)pNmean->At(6*cham+2*iRad  ))->Eval(pEsd->GetTimeStamp());         //C6F14 low  temp for this chamber
 249       Double_t tHigh = ((TF1*)pNmean->At(6*cham+2*iRad+1))->Eval(pEsd->GetTimeStamp());         //C6F14 high temp for this chamber
 250       Double_t tExp  = pParam->FindTemp(tLow,tHigh,yRa);                                        //estimated temp for that chamber at that y
 251       nmean = pParam->NIdxRad(AliHMPIDParam::Instance()->GetEPhotMean(),tExp);                  //mean ref idx @ a given temp
 252       }
 253       if(nmean < 0){                                                                            //track didn' t pass through the radiator
 254          pTrk->SetHMPIDsignal(AliHMPIDRecon::kNoRad);                                           //set the appropriate flag
 255          pTrk->SetHMPIDcluIdx(ipCh,index+1000*cluSiz);                                          //set index of cluster
 256          continue;
 257       }
 258     }
 259     //
 260     recon.SetImpPC(xPc,yPc);                                                                     //store track impact to PC
 261     recon.CkovAngle(pTrk,(TClonesArray *)pClus->At(cham),index,nmean);                           //search for Cerenkov angle of this track
 262
 263     AliHMPIDPid pID;
 264     Double_t prob[5];
 265     pID.FindPid(pTrk,5,prob);
 266     pTrk->SetHMPIDpid(prob);
 267 //      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);
 268
 269   }//iTrk
 270
 271   return 0; // error code: 0=no error;
 272 }//Recon()
 273 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 274 Int_t AliHMPIDTracker::ReconHiddenTrk(AliESDEvent *pEsd,TObjArray *pClus,TObjArray *pNmean, TObjArray *pQthre)
 275 {
 276 // Static method to reconstruct Theta Ckov for all valid tracks of a given event.
 277 // 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)
 278 //   Returns: error code, 0 if no errors
 279
 280   AliHMPIDReconHTA reconHTA;                                                                     //instance of reconstruction class, nothing important in ctor
 281
 282   AliHMPIDParam *pParam = AliHMPIDParam::Instance();                                             //Instance of AliHMPIDParam
 283
 284   for(Int_t iTrk=0;iTrk<pEsd->GetNumberOfTracks();iTrk++){                                        //loop on the ESD tracks in the event
 285
 286     AliESDtrack *pTrk = pEsd->GetTrack(iTrk);                                                     //here it is simulated or just empty track
 287     Int_t ipCh;
 288     ipCh = pTrk->GetHMPIDcluIdx();ipCh/=1000000;
 289     if(ipCh<0) continue;
 290
 291     TClonesArray *pMipCluLst=(TClonesArray *)pClus->At(ipCh);                                   //get the list of clusters
 292     Int_t nMipClusTot = pMipCluLst->GetEntries();                                               //total number of clusters in the given chamber
 293
 294     Double_t qMip=-1;
 295     Int_t chMip=-1;
 296     Double_t xMip = 0;
 297     Double_t yMip = 0;
 298     Int_t indMip  = 0;
 299     Int_t cluMipSiz = 0;
 300
 301     for (Int_t iClu=0; iClu<nMipClusTot;iClu++) {                                               //clusters loop
 302
 303       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pMipCluLst->UncheckedAt(iClu);                    //get the cluster
 304       Double_t qClus = pClu->Q();
 305       if(qClus>qMip) {
 306         qMip  = qClus;
 307         chMip = pClu->Ch();
 308         xMip = pClu->X();
 309         yMip = pClu->Y();
 310         indMip = iClu;
 311         cluMipSiz = pClu->Size();
 312       }
 313     }//clus loop
 314
 315     if(chMip<0) return 1;
 316
 317     Int_t hvsec;
 318     Double_t qthre=0;
 319 // evaluate qThre
 320     if(pQthre->GetEntriesFast()==pParam->kMaxCh+1) {                                              // just for backward compatibility
 321       qthre=((TF1*)pQthre->At(chMip))->Eval(pEsd->GetTimeStamp());                                //
 322     } else {                                                                                      // in the past just 1 qthre
 323       hvsec = pParam->InHVSector(yMip);                                                           //  per chamber
 324       if(hvsec>=0) qthre=((TF1*)pQthre->At(6*chMip+hvsec))->Eval(pEsd->GetTimeStamp());           //
 325     }
 326 //
 327     if(qMip<qthre) {
 328       pTrk->SetHMPIDmip(xMip,yMip,(Int_t)qMip,0);                                                        //store mip info in any case
 329       pTrk->SetHMPIDcluIdx(chMip,indMip+1000*cluMipSiz);
 330       pTrk->SetHMPIDsignal(pParam->kMipQdcCut);
 331       return 1;                                                                                   //charge compatible with MIP clusters
 332     }
 333
 334     pTrk->SetHMPIDmip(xMip,yMip,(Int_t)qMip,0);                                                   //store mip info in any case
 335     pTrk->SetHMPIDcluIdx(chMip,indMip+1000*cluMipSiz);
 336
 337     Double_t yRa = yMip;                                                                        //just an approx...
 338     Double_t nmean;
 339     //evaluate nMean
 340     if(pNmean->GetEntries()==21) {                                                              //for backward compatibility
 341       nmean=((TF1*)pNmean->At(3*chMip))->Eval(pEsd->GetTimeStamp());                            //C6F14 Nmean for this chamber
 342     } else {
 343       Int_t iRad     = pParam->Radiator(yRa);                                                   //evaluate the radiator involved
 344       if(iRad < 0) {
 345         nmean = -1;
 346       } else {
 347       Double_t tLow  = ((TF1*)pNmean->At(6*chMip+2*iRad  ))->Eval(pEsd->GetTimeStamp());        //C6F14 low  temp for this chamber
 348       Double_t tHigh = ((TF1*)pNmean->At(6*chMip+2*iRad+1))->Eval(pEsd->GetTimeStamp());        //C6F14 high temp for this chamber
 349       Double_t tExp  = pParam->FindTemp(tLow,tHigh,yRa);                                        //estimated temp for that chamber at that y
 350       nmean = pParam->NIdxRad(AliHMPIDParam::Instance()->GetEPhotMean(),tExp);                  //mean ref idx @ a given temp
 351       }
 352       if(nmean < 0){                                                                            //track didn' t pass through the radiator
 353          pTrk->SetHMPIDsignal(AliHMPIDRecon::kNoRad);                                           //set the appropriate flag
 354          return 1;
 355       }
 356     }
 357     //
 358     if(!reconHTA.CkovHiddenTrk(pTrk,(TClonesArray *)pClus->At(ipCh),indMip,nmean)) {                 //search for track parameters and Cerenkov angle of this track
 359       AliHMPIDPid pID;
 360       Double_t prob[5];
 361       pID.FindPid(pTrk,5,prob);
 362       pTrk->SetHMPIDpid(prob);
 363     }
 364 //      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);
 365   }//iTrk
 366
 367   return 0; // error code: 0=no error;
 368
 369 }//Recon()
 370 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 371 void AliHMPIDTracker::FillClusterArray(TObjArray* array) const {
 372
 373  // Publishes all pointers to clusters known to the tracker into the
 374   // passed object array.
 375   // The ownership is not transfered - the caller is not expected to delete
 376   // the clusters
 377
 378   for(Int_t iCh=AliHMPIDParam::kMinCh;iCh<=AliHMPIDParam::kMaxCh;iCh++){
 379     TClonesArray *pCluArr=(TClonesArray*)(*fClu)[iCh];
 380     for (Int_t iClu=0; iClu<pCluArr->GetEntriesFast();iClu++){
 381       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pCluArr->UncheckedAt(iClu);
 382       array->AddLast(pClu);
 383     }//cluster loop in iCh
 384     pCluArr->Delete();
 385   }//Ch loop
 386
 387   return;
 388 }
 389 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++