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 <AliESDEvent.h>         //PropagateBack(),Recon()
  11 #include <AliESDtrack.h>         //Intersect()
  12 #include <AliTracker.h>
  13 #include <AliRun.h>              //GetTrackPoint(),PropagateBack()
  14 #include <AliTrackPointArray.h>  //GetTrackPoint()
  15 #include <AliAlignObj.h>         //GetTrackPoint()
  16 #include <AliCDBManager.h>       //PropageteBack()
  17 #include <AliCDBEntry.h>         //PropageteBack()
  18 //.
  19 // HMPID base class fo tracking
  20 //.
  21 //.
  22 //.
  23 ClassImp(AliHMPIDTracker)
  24 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  25 AliHMPIDTracker::AliHMPIDTracker():
  26   AliTracker(),
  27   fClu(new TObjArray(AliHMPIDParam::kMaxCh+1))
  28 {
  29 // ctor. Create TObjArray of TClonesArray of AliHMPIDCluster
  30 //
  31 //
  32   fClu->SetOwner(kTRUE);
  33   for(int i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++) fClu->AddAt(new TClonesArray("AliHMPIDCluster"),i);
  34 }//ctor
  35 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  36 Bool_t AliHMPIDTracker::GetTrackPoint(Int_t idx, AliTrackPoint& point) const
  37 {
  38 // Interface callback methode invoked from AliReconstruction::WriteAlignmentData() to get position of MIP cluster in MARS associated to a current track.
  39 // MIP cluster is reffered by index which is stored in AliESDtrack  ???????
  40 // Arguments: idx- cluster index which is stored by HMPID in AliESDtrack
  41 //            point- reference to the object where to store the point
  42 //   Returns: status of operation  if FALSE then AliReconstruction::WriteAlignmentData() do not store this point to array of points for current track.
  43   if(idx<0) return kFALSE; //no MIP cluster assigned to this track in PropagateBack()
  44   Int_t iCham=idx/1000000; Int_t iClu=idx%1000000;
  45   iClu = iClu%1000; //GetHMPIDcluIdx -> 1e+6*ch + 1e+3*clusize + cluIdx;
  46   point.SetVolumeID(AliGeomManager::LayerToVolUID(AliGeomManager::kHMPID,iCham));//layer and chamber number
  47   TClonesArray *pArr=(TClonesArray*)(*fClu)[iCham];
  48   AliHMPIDCluster *pClu=(AliHMPIDCluster*)pArr->UncheckedAt(iClu);//get pointer to cluster
  49   Float_t xyz[3];
  50   pClu->GetGlobalXYZ(xyz);
  51   Float_t cov[6];
  52   pClu->GetGlobalCov(cov);
  53   point.SetXYZ(xyz,cov);
  54   return kTRUE;
  55 }//GetTrackPoint()
  56 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  57 Int_t AliHMPIDTracker::IntTrkCha(AliESDtrack *pTrk,Float_t &xPc,Float_t &yPc,Float_t &xRa,Float_t &yRa,Float_t &theta,Float_t &phi)
  58 {
  59 // Static method to find intersection in between given track and HMPID chambers
  60 // Arguments: pTrk- ESD track; xPc,yPc- track intersection with PC in LORS [cm]
  61 //   Returns: intersected chamber ID or -1
  62   AliHMPIDtrack *hmpTrk = new AliHMPIDtrack(*pTrk);                                             //create a hmpid track to be used for propagation and matching
  63   for(Int_t i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++){                              //chambers loop
  64     Int_t chInt = IntTrkCha(i,hmpTrk,xPc,yPc,xRa,yRa,theta,phi);
  65     if(chInt>=0) {delete hmpTrk;hmpTrk=0x0;return chInt;}
  66   }                                                                                             //chambers loop
  67   delete hmpTrk; hmpTrk=0x0;
  68   return -1;                                                                                    //no intersection with HMPID chambers
  69 }//IntTrkCha()
  70 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  71 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)
  72 {
  73 // Static method to find intersection in between given track and HMPID chambers
  74 // Arguments: pTrk- HMPID track; xPc,yPc- track intersection with PC in LORS [cm]
  75 //   Returns: intersected chamber ID or -1
  76     AliHMPIDParam *pParam=AliHMPIDParam::Instance();
  77     Double_t p1[3],n1[3];
  78     pParam->Norm(ch,n1);
  79     pParam->Point(ch,p1,AliHMPIDParam::kRad);                                                    //point & norm  for middle of radiator plane
  80     Double_t p2[3],n2[3];
  81     pParam->Norm(ch,n2);
  82     pParam->Point(ch,p2,AliHMPIDParam::kPc);                                                     //point & norm  for entrance to PC plane
  83     if(pTrk->Intersect(p1,n1)==kFALSE) return -1;                                                //try to intersect track with the middle of radiator
  84     if(pTrk->Intersect(p2,n2)==kFALSE) return -1;
  85     pParam->Mars2LorsVec(ch,n1,theta,phi);                                                       //track angles at RAD
  86     pParam->Mars2Lors   (ch,p1,xRa,yRa);                                                         //TRKxRAD position
  87     pParam->Mars2Lors   (ch,p2,xPc,yPc);                                                         //TRKxPC position
  88     if(AliHMPIDParam::IsInside(xPc,yPc,pParam->DistCut())==kTRUE) return ch;                     //return intersected chamber
  89   return -1;                                                                                     //no intersection with HMPID chambers
  90 }//IntTrkCha()
  91 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  92 Int_t AliHMPIDTracker::LoadClusters(TTree *pCluTree)
  93 {
  94 // Interface callback methode invoked from AliReconstruction::RunTracking() to load HMPID clusters before PropagateBack() gets control. Done once per event.
  95 // Arguments: pCluTree- pointer to clusters tree got by AliHMPIDLoader::LoadRecPoints("read") then AliHMPIDLoader::TreeR()
  96 //   Returns: error code (currently ignored in AliReconstruction::RunTraking())
  97   for(int i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++) pCluTree->SetBranchAddress(Form("HMPID%d",i),&((*fClu)[i]));
  98   pCluTree->GetEntry(0);
  99   return 0;
 100 }//LoadClusters()
 101 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 102 Int_t AliHMPIDTracker::PropagateBack(AliESDEvent *pEsd)
 103 {
 104 // Interface pure virtual in AliTracker. Invoked from AliReconstruction::RunTracking() after invocation of AliTracker::LoadClusters() once per event
 105 // Agruments: pEsd - pointer to ESD
 106 //   Returns: error code
 107   AliCDBEntry *pNmeanEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Nmean"); //contains TObjArray of 42 TF1 + 1 EPhotMean
 108   AliCDBEntry *pQthreEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Qthre"); //contains TObjArray of 42 (7ch * 6sec) TF1
 109   if(!pNmeanEnt) AliError("No Nmean C6F14 ");
 110   if(!pQthreEnt) AliError("No Qthre");
 111
 112   return Recon(pEsd,fClu,(TObjArray*)pNmeanEnt->GetObject(),(TObjArray*)pQthreEnt->GetObject());
 113 }//PropagateBack()
 114 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 115 Int_t AliHMPIDTracker::Recon(AliESDEvent *pEsd,TObjArray *pClus,TObjArray *pNmean, TObjArray *pQthre)
 116 {
 117 // Static method to reconstruct Theta Ckov for all valid tracks of a given event.
 118 // Arguments: pEsd- pointer ESD; pClu- pointer to clusters for all chambers; pNmean - pointer to all function Nmean=f(time)
 119 //   Returns: error code, 0 if no errors
 120
 121   AliHMPIDRecon recon;                                                                           //instance of reconstruction class, nothing important in ctor
 122   AliHMPIDParam *pParam = AliHMPIDParam::Instance();                                             //Instance of AliHMPIDParam
 123   Float_t xPc,yPc,xRa,yRa,theta,phi;
 124   Double_t cluLORS[2]={0};
 125 //  Double_t 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;
 130   Double_t qthre = 0;   Double_t nmean=0; Int_t hvsec=0;
 131   Int_t nClusCh[AliHMPIDParam::kMaxCh+1];
 132
 133
 134   for(Int_t iTrk=0;iTrk<pEsd->GetNumberOfTracks();iTrk++){                                        //loop on the ESD tracks in the event
 135
 136 //    Double_t bestChi2=99999;chi2=99999;                                                          //init. track matching params
 137     Double_t dmin=999999,bz=0,distCut=1,distParams[5]={1};
 138
 139     Bool_t isOkDcut=kFALSE;
 140     Bool_t isOkQcut=kFALSE;
 141     Bool_t isMatched=kFALSE;
 142
 143     AliHMPIDCluster *bestHmpCluster=0x0;                                                          //the best matching cluster
 144     AliESDtrack *pTrk = pEsd->GetTrack(iTrk);                                                     //get reconstructed track
 145
 146     if(!pTrk->IsOn(AliESDtrack::kTPCout)) continue;
 147
 148     if(pTrk->IsOn(AliESDtrack::kTPCrefit)) continue;
 149
 150     AliHMPIDtrack *hmpTrk = new AliHMPIDtrack(*pTrk);                                             //create a hmpid track to be used for propagation and matching
 151     bz=AliTracker::GetBz();
 152 //initial flags for HMPID ESD infos
 153     pTrk->SetHMPIDtrk(0,0,0,0);                                                                //no intersection found
 154     pTrk->SetHMPIDmip(0,0,0,0);                                                                //store mip info in any case
 155     pTrk->SetHMPIDcluIdx(99,99999);                                                            //chamber not found, mip not yet considered
 156     pTrk->SetHMPIDsignal(AliHMPIDRecon::kNotPerformed);                                        //ring reconstruction not yet performed
 157
 158     Int_t ipCh=IntTrkCha(pTrk,xPc,yPc,xRa,yRa,theta,phi);                                        //find the intersected chamber for this track
 159     if(ipCh<0) continue;                                                                         //no intersection at all, go after next track
 160
 161     pTrk->SetHMPIDtrk(xPc,yPc,theta,phi);                                                        //store initial infos
 162     pTrk->SetHMPIDcluIdx(ipCh,9999);                                                             //set chamber, index of cluster + cluster size
 163
 164 // track intersects the chamber ipCh: find the MIP
 165
 166     TClonesArray *pMipCluLst=(TClonesArray *)pClus->At(ipCh);                                   //get the list of clusters
 167     nMipClusTot = pMipCluLst->GetEntries();                                                     //total number of clusters in the given chamber
 168     nClusCh[ipCh] = nMipClusTot;
 169
 170     if(nMipClusTot==0) continue;
 171
 172     Int_t index=-1;                                                                             //index of the "best" matching cluster
 173
 174     for (Int_t iClu=0; iClu<nMipClusTot;iClu++) {                                               //clusters loop
 175
 176       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pMipCluLst->UncheckedAt(iClu);                    //get the cluster
 177 // evaluate qThre
 178       if(pQthre->GetEntriesFast()==pParam->kMaxCh+1) {                                             // just for backward compatibility
 179         qthre=((TF1*)pQthre->At(pClu->Ch()))->Eval(pEsd->GetTimeStamp());                          //
 180       } else {                                                                                     // in the past just 1 qthre
 181         hvsec = pParam->InHVSector(pClu->Y());                                              //  per chamber
 182         if(hvsec>=0)
 183           qthre=((TF1*)pQthre->At(6*ipCh+hvsec))->Eval(pEsd->GetTimeStamp());                      //
 184       }                                                                                            //
 185 //
 186       if(pClu->Q()<qthre) continue;                                                                      //charge compartible with MIP clusters
 187       isOkQcut = kTRUE;
 188 //
 189       cluLORS[0]=pClu->X(); cluLORS[1]=pClu->Y();                                            //get the LORS coordinates of the cluster
 190       Double_t dist = TMath::Sqrt((xPc-cluLORS[0])*(xPc-cluLORS[0])+(yPc-cluLORS[1])*(yPc-cluLORS[1]));
 191
 192       if(dist<dmin) {
 193         dmin = dist;
 194         index=iClu;
 195         bestHmpCluster=pClu;
 196       }
 197     }
 198
 199     if(!isOkQcut) {
 200       pTrk->SetHMPIDsignal(pParam->kMipQdcCut);
 201       continue;
 202     }
 203
 204     Double_t radius = (pParam->Lors2Mars(ipCh,pParam->SizeAllX()/2,pParam->SizeAllY()/2)).Mag();
 205
 206     if(!AliTracker::PropagateTrackToBxByBz(hmpTrk,radius,pTrk->GetMass(),1,kFALSE)) continue;
 207
 208     if(!hmpTrk->PropagateTo(bestHmpCluster)) continue;
 209
 210     Int_t cluSiz = bestHmpCluster->Size();
 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
 214     if(AliHMPIDReconstructor::GetRecoParam())                                                 //retrieve distance cut
 215     {
 216       if(AliHMPIDReconstructor::GetRecoParam()->IsFixedDistCut()==kTRUE)                      //distance cut is fixed number
 217       {
 218         distCut=AliHMPIDReconstructor::GetRecoParam()->GetHmpTrackMatchingDist();
 219       }
 220       else
 221       {
 222         for(Int_t ipar=0;ipar<5;ipar++) distParams[ipar]=AliHMPIDReconstructor::GetRecoParam()->GetHmpTrackMatchingDistParam(ipar);      //prevision: distance cut is function of momentum
 223         distCut=distParams[0]+distParams[1]*TMath::Power(distParams[2]*pTrk->GetP(),distParams[3]); //prevision: change functional form to be more precise
 224       }
 225     }
 226     else {distCut=pParam->DistCut();}
 227
 228     if(dmin < distCut) {
 229       isOkDcut = kTRUE;
 230     }
 231
 232
 233
 234     if(!isOkDcut) {
 235       pTrk->SetHMPIDsignal(pParam->kMipDistCut);                                                //closest cluster with enough charge is still too far from intersection
 236     }
 237
 238     if(isOkQcut*isOkDcut) isMatched = kTRUE;                                                    // MIP-Track matched !!
 239
 240     if(!isMatched) continue;                                                                    // If matched continue...
 241
 242     Bool_t isOk = hmpTrk->Update(bestHmpCluster,0.1,0);
 243     if(!isOk) continue;
 244     pTrk->SetOuterHmpParam(hmpTrk,AliESDtrack::kHMPIDout);
 245
 246     FillResiduals(hmpTrk,bestHmpCluster,kFALSE);
 247
 248
 249     //evaluate nMean
 250     if(pNmean->GetEntries()==21) {                                                              //for backward compatibility
 251       nmean=((TF1*)pNmean->At(3*ipCh))->Eval(pEsd->GetTimeStamp());                             //C6F14 Nmean for this chamber
 252     } else {
 253       Int_t iRad     = pParam->Radiator(yRa);                                                   //evaluate the radiator involved
 254       if(iRad < 0) {
 255         nmean = -1;
 256       } else {
 257       Double_t tLow  = ((TF1*)pNmean->At(6*ipCh+2*iRad  ))->Eval(pEsd->GetTimeStamp());         //C6F14 low  temp for this chamber
 258       Double_t tHigh = ((TF1*)pNmean->At(6*ipCh+2*iRad+1))->Eval(pEsd->GetTimeStamp());         //C6F14 high temp for this chamber
 259       Double_t tExp  = pParam->FindTemp(tLow,tHigh,yRa);                                        //estimated temp for that chamber at that y
 260       nmean = pParam->NIdxRad(AliHMPIDParam::Instance()->GetEPhotMean(),tExp);                  //mean ref idx @ a given temp
 261       }
 262       if(nmean < 0){                                                                            //track didn' t pass through the radiator
 263          pTrk->SetHMPIDsignal(AliHMPIDRecon::kNoRad);                                           //set the appropriate flag
 264          pTrk->SetHMPIDcluIdx(ipCh,index+1000*cluSiz);                                          //set index of cluster
 265          continue;
 266       }
 267     }
 268     //
 269     recon.SetImpPC(xPc,yPc);                                                                     //store track impact to PC
 270     recon.CkovAngle(pTrk,(TClonesArray *)pClus->At(ipCh),index,nmean,xRa,yRa);                   //search for Cerenkov angle of this track
 271
 272     if(pTrk->GetHMPIDsignal()<0) continue;
 273
 274     AliHMPIDPid pID;
 275     Double_t prob[5];
 276     pID.FindPid(pTrk,5,prob);
 277     pTrk->SetHMPIDpid(prob);
 278 //      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);
 279
 280     delete hmpTrk;hmpTrk=0x0;
 281   }//iTrk
 282
 283   return 0; // error code: 0=no error;
 284 }//Recon()
 285 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 286 Int_t AliHMPIDTracker::ReconHiddenTrk(AliESDEvent *pEsd,TObjArray *pClus,TObjArray *pNmean, TObjArray *pQthre)
 287 {
 288 // Static method to reconstruct Theta Ckov for all valid tracks of a given event.
 289 // 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)
 290 //   Returns: error code, 0 if no errors
 291
 292   AliHMPIDReconHTA reconHTA;                                                                     //instance of reconstruction class, nothing important in ctor
 293
 294   AliHMPIDParam *pParam = AliHMPIDParam::Instance();                                             //Instance of AliHMPIDParam
 295
 296   for(Int_t iTrk=0;iTrk<pEsd->GetNumberOfTracks();iTrk++){                                        //loop on the ESD tracks in the event
 297
 298     AliESDtrack *pTrk = pEsd->GetTrack(iTrk);                                                     //here it is simulated or just empty track
 299     Int_t ipCh;
 300     ipCh = pTrk->GetHMPIDcluIdx();ipCh/=1000000;
 301     if(ipCh<0) continue;
 302
 303     TClonesArray *pMipCluLst=(TClonesArray *)pClus->At(ipCh);                                   //get the list of clusters
 304     Int_t nMipClusTot = pMipCluLst->GetEntries();                                               //total number of clusters in the given chamber
 305
 306     Double_t qMip=-1;
 307     Int_t chMip=-1;
 308     Double_t xMip = 0;
 309     Double_t yMip = 0;
 310     Int_t indMip  = 0;
 311     Int_t cluMipSiz = 0;
 312
 313     for (Int_t iClu=0; iClu<nMipClusTot;iClu++) {                                               //clusters loop
 314
 315       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pMipCluLst->UncheckedAt(iClu);                    //get the cluster
 316       Double_t qClus = pClu->Q();
 317       if(qClus>qMip) {
 318         qMip  = qClus;
 319         chMip = pClu->Ch();
 320         xMip = pClu->X();
 321         yMip = pClu->Y();
 322         indMip = iClu;
 323         cluMipSiz = pClu->Size();
 324       }
 325     }//clus loop
 326
 327     if(chMip<0) return 1;
 328
 329     Int_t hvsec;
 330     Double_t qthre=0;
 331 // evaluate qThre
 332     if(pQthre->GetEntriesFast()==pParam->kMaxCh+1) {                                              // just for backward compatibility
 333       qthre=((TF1*)pQthre->At(chMip))->Eval(pEsd->GetTimeStamp());                                //
 334     } else {                                                                                      // in the past just 1 qthre
 335       hvsec = pParam->InHVSector(yMip);                                                           //  per chamber
 336       if(hvsec>=0) qthre=((TF1*)pQthre->At(6*chMip+hvsec))->Eval(pEsd->GetTimeStamp());           //
 337     }
 338 //
 339     if(qMip<qthre) {
 340       pTrk->SetHMPIDmip(xMip,yMip,(Int_t)qMip,0);                                                        //store mip info in any case
 341       pTrk->SetHMPIDcluIdx(chMip,indMip+1000*cluMipSiz);
 342       pTrk->SetHMPIDsignal(pParam->kMipQdcCut);
 343       return 1;                                                                                   //charge compatible with MIP clusters
 344     }
 345
 346     pTrk->SetHMPIDmip(xMip,yMip,(Int_t)qMip,0);                                                   //store mip info in any case
 347     pTrk->SetHMPIDcluIdx(chMip,indMip+1000*cluMipSiz);
 348
 349     Double_t yRa = yMip;                                                                        //just an approx...
 350     Double_t nmean;
 351     //evaluate nMean
 352     if(pNmean->GetEntries()==21) {                                                              //for backward compatibility
 353       nmean=((TF1*)pNmean->At(3*chMip))->Eval(pEsd->GetTimeStamp());                            //C6F14 Nmean for this chamber
 354     } else {
 355       Int_t iRad     = pParam->Radiator(yRa);                                                   //evaluate the radiator involved
 356       if(iRad < 0) {
 357         nmean = -1;
 358       } else {
 359       Double_t tLow  = ((TF1*)pNmean->At(6*chMip+2*iRad  ))->Eval(pEsd->GetTimeStamp());        //C6F14 low  temp for this chamber
 360       Double_t tHigh = ((TF1*)pNmean->At(6*chMip+2*iRad+1))->Eval(pEsd->GetTimeStamp());        //C6F14 high temp for this chamber
 361       Double_t tExp  = pParam->FindTemp(tLow,tHigh,yRa);                                        //estimated temp for that chamber at that y
 362       nmean = pParam->NIdxRad(AliHMPIDParam::Instance()->GetEPhotMean(),tExp);                  //mean ref idx @ a given temp
 363       }
 364       if(nmean < 0){                                                                            //track didn' t pass through the radiator
 365          pTrk->SetHMPIDsignal(AliHMPIDRecon::kNoRad);                                           //set the appropriate flag
 366          return 1;
 367       }
 368     }
 369     //
 370     if(!reconHTA.CkovHiddenTrk(pTrk,(TClonesArray *)pClus->At(ipCh),indMip,nmean)) {                 //search for track parameters and Cerenkov angle of this track
 371       AliHMPIDPid pID;
 372       Double_t prob[5];
 373       pID.FindPid(pTrk,5,prob);
 374       pTrk->SetHMPIDpid(prob);
 375     }
 376 //      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);
 377   }//iTrk
 378
 379   return 0; // error code: 0=no error;
 380
 381 }//Recon()
 382 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 383 void AliHMPIDTracker::FillClusterArray(TObjArray* array) const {
 384
 385  // Publishes all pointers to clusters known to the tracker into the
 386   // passed object array.
 387   // The ownership is not transfered - the caller is not expected to delete
 388   // the clusters
 389
 390   for(Int_t iCh=AliHMPIDParam::kMinCh;iCh<=AliHMPIDParam::kMaxCh;iCh++){
 391     TClonesArray *pCluArr=(TClonesArray*)(*fClu)[iCh];
 392     for (Int_t iClu=0; iClu<pCluArr->GetEntriesFast();iClu++){
 393       AliHMPIDCluster *pClu=(AliHMPIDCluster*)pCluArr->UncheckedAt(iClu);
 394       array->AddLast(pClu);
 395     }//cluster loop in iCh
 396     pCluArr->Delete();
 397   }//Ch loop
 398
 399   return;
 400 }
 401 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++