HMPID/AliHMPIDTracker.cxx

   1 #include "AliHMPIDTracker.h"     //class header
   2 #include "AliHMPIDCluster.h"     //GetTrackPoint(),PropagateBack()
   3 #include "AliHMPIDParam.h"       //GetTrackPoint(),PropagateBack()
   4 #include "AliHMPIDRecon.h"       //Recon()
   5 #include <AliESDEvent.h>              //PropagateBack(),Recon()
   6 #include <AliESDtrack.h>              //Intersect()
   7 #include <AliRun.h>              //GetTrackPoint(),PropagateBack()
   8 #include <AliTrackPointArray.h>  //GetTrackPoint()
   9 #include <AliAlignObj.h>         //GetTrackPoint()
  10 #include <AliCDBManager.h>       //PropageteBack()
  11 #include <AliCDBEntry.h>         //PropageteBack()
  12 //.
  13 // HMPID base class fo tracking
  14 //.
  15 //.
  16 //.
  17 ClassImp(AliHMPIDTracker)
  18 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  19 AliHMPIDTracker::AliHMPIDTracker():AliTracker()
  20 {
  21 // ctor. Create TObjArray of TClonesArray of AliHMPIDCluster
  22 //
  23 //
  24   fClu=new TObjArray(AliHMPIDParam::kMaxCh+1);  fClu->SetOwner(kTRUE);
  25   for(int i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++) fClu->AddAt(new TClonesArray("AliHMPIDCluster"),i);
  26 }//ctor
  27 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  28 Bool_t AliHMPIDTracker::GetTrackPoint(Int_t idx, AliTrackPoint& point) const
  29 {
  30 // Interface callback methode invoked from AliReconstruction::WriteAlignmentData() to get position of MIP cluster in MARS associated to a current track.
  31 // MIP cluster is reffered by index which is stored in AliESDtrack  ???????
  32 // Arguments: idx- cluster index which is stored by HMPID in AliESDtrack
  33 //            point- reference to the object where to store the point
  34 //   Returns: status of operation  if FALSE then AliReconstruction::WriteAlignmentData() do not store this point to array of points for current track.
  35   if(idx<0) return kFALSE; //no MIP cluster assigned to this track in PropagateBack()
  36   Int_t iCham=idx/1000000; Int_t iClu=idx%1000000;
  37   point.SetVolumeID(AliGeomManager::LayerToVolUID(AliGeomManager::kHMPID,iCham-1));//layer and chamber number
  38   TClonesArray *pArr=(TClonesArray*)(*fClu)[iCham];
  39   AliHMPIDCluster *pClu=(AliHMPIDCluster*)pArr->UncheckedAt(iClu);//get pointer to cluster
  40   Double_t mars[3];
  41   AliHMPIDParam::Instance()->Lors2Mars(iCham,pClu->X(),pClu->Y(),mars);
  42   point.SetXYZ(mars[0],mars[1],mars[2]);
  43   return kTRUE;
  44 }//GetTrackPoint()
  45 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  46 Int_t AliHMPIDTracker::IntTrkCha(AliESDtrack *pTrk,Float_t &xPc,Float_t &yPc)
  47 {
  48 // Static method to find intersection in between given track and HMPID chambers
  49 // Arguments: pTrk- ESD track; xPc,yPc- track intersection with PC in LORS [cm]
  50 //   Returns: intersected chamber ID or -1
  51   AliHMPIDParam *pParam=AliHMPIDParam::Instance();
  52   Float_t xRa=0,yRa=0,theta=0,phi=0;                                                            //track intersection at PC and angles at RAD, LORS
  53   for(Int_t i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++){                              //chambers loop
  54     Double_t p1[3],n1[3]; pParam->Norm(i,n1); pParam->Point(i,p1,AliHMPIDParam::kRad);          //point & norm  for middle of radiator plane
  55     Double_t p2[3],n2[3]; pParam->Norm(i,n2); pParam->Point(i,p2,AliHMPIDParam::kPc);           //point & norm  for entrance to PC plane
  56     if(pTrk->Intersect(p1,n1,-GetBz())==kFALSE) continue;                                       //try to intersect track with the middle of radiator
  57     if(pTrk->Intersect(p2,n2,-GetBz())==kFALSE) continue;                                       //try to intersect track with PC
  58     pParam->Mars2LorsVec(i,n1,theta,phi);                                                       //track angles at RAD
  59     pParam->Mars2Lors   (i,p1,xRa,yRa);                                                         //TRKxRAD position
  60     pParam->Mars2Lors   (i,p2,xPc,yPc);                                                         //TRKxPC position
  61     if(AliHMPIDParam::IsInside(xPc,yPc,pParam->DistCut())==kFALSE) continue;                    //not in active area
  62     pTrk->SetHMPIDtrk      (xRa,yRa,theta,phi);                                                 //store track intersection info
  63     pTrk->SetHMPIDcluIdx   (i,0);
  64     return i;
  65   }                                                                                             //chambers loop
  66   return -1; //no intersection with HMPID chambers
  67 }//IntTrkCha()
  68 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  69 Int_t AliHMPIDTracker::LoadClusters(TTree *pCluTree)
  70 {
  71 // Interface callback methode invoked from AliReconstruction::RunTracking() to load HMPID clusters before PropagateBack() gets control. Done once per event.
  72 // Arguments: pCluTree- pointer to clusters tree got by AliHMPIDLoader::LoadRecPoints("read") then AliHMPIDLoader::TreeR()
  73 //   Returns: error code (currently ignored in AliReconstruction::RunTraking())
  74   for(int i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++) pCluTree->SetBranchAddress(Form("HMPID%d",i),&((*fClu)[i]));
  75   pCluTree->GetEntry(0);
  76   return 0;
  77 }//LoadClusters()
  78 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  79 Int_t AliHMPIDTracker::PropagateBack(AliESDEvent *pEsd)
  80 {
  81 // Interface pure virtual in AliTracker. Invoked from AliReconstruction::RunTracking() after invocation of AliTracker::LoadClusters() once per event
  82 // Agruments: pEsd - pointer to ESD
  83 //   Returns: error code
  84   AliCDBEntry *pNmeanEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Nmean"); //contains TObjArray of 21 TF1
  85   AliCDBEntry *pQthreEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Qthre"); //contains TObjArray of 7 TF1
  86   if(!pNmeanEnt) AliFatal("No Nmean C6F14 ");
  87   if(!pQthreEnt) AliFatal("No Qthre");
  88
  89   return Recon(pEsd,fClu,(TObjArray*)pNmeanEnt->GetObject(),(TObjArray*)pQthreEnt->GetObject());
  90 }//PropagateBack()
  91 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  92 Int_t AliHMPIDTracker::Recon(AliESDEvent *pEsd,TObjArray *pClus,TObjArray *pNmean, TObjArray *pQthre)
  93 {
  94 // Static method to reconstruct Theta Ckov for all valid tracks of a given event.
  95 // Arguments: pEsd- pointer ESD; pClu- pointer to clusters for all chambers; pNmean - pointer to all function Nmean=f(time)
  96 //   Returns: error code, 0 if no errors
  97   AliHMPIDRecon recon;                                                                       //instance of reconstruction class, nothing important in ctor
  98   Float_t xPc,yPc;
  99   for(Int_t iTrk=0;iTrk<pEsd->GetNumberOfTracks();iTrk++){                                       //ESD tracks loop
 100     AliESDtrack *pTrk = pEsd->GetTrack(iTrk);                                                    //get reconstructed track
 101     Int_t cham=IntTrkCha(pTrk,xPc,yPc);                                                          //get chamber intersected by this track
 102     if(cham<0) continue;                                                                         //no intersection at all, go after next track
 103     Double_t nmean=((TF1*)pNmean->At(3*cham))->Eval(pEsd->GetTimeStamp());                       //C6F14 Nmean for this chamber
 104     Double_t qthre=((TF1*)pQthre->At(cham))  ->Eval(pEsd->GetTimeStamp());                       //Qthre for this chamber
 105     recon.SetImpPC(xPc,yPc);                                                                     //store track impact to PC
 106     recon.CkovAngle(pTrk,(TClonesArray *)pClus->At(cham),nmean,qthre);                           //search for Cerenkov angle of this track
 107 //    Printf("AliHMPIDTracker::Recon: nmean %f, qthre %f",nmean,qthre);
 108   }                                                                                              //ESD tracks loop
 109   return 0; // error code: 0=no error;
 110 }//Recon()
 111 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 112 Int_t AliHMPIDTracker::ReconHiddenTrk(Int_t iCh,AliESDtrack *pTrk,TClonesArray *pCluLst,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), pQthre - pointer to all function Qthre=f(time)
 116 //   Returns: error code, 0 if no errors
 117   AliHMPIDRecon recon;                                                                          //instance of reconstruction class, nothing important in ctor
 118   Double_t nmean=((TF1*)pNmean->At(3*iCh))->Eval(0);                                            //C6F14 Nmean for this chamber
 119   Double_t qthre=((TF1*)pQthre->At(iCh))  ->Eval(0);                                            //C6F14 Nmean for this chamber
 120   if(pCluLst->GetEntriesFast()<4) return 1;                                                     //min 4 clusters (3 + 1 mip) to find a ring!
 121   if(recon.CkovHiddenTrk(pTrk,pCluLst,nmean,qthre)) return 0;                                   //search for track parameters and Cerenkov angle of this track
 122   else return 1;                                                                                // error code: 0=no error,1=fit not performed;
 123 }//Recon()
 124 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++