[u/mrichter/AliRoot.git] / HMPID / AliHMPIDTracker.cxx

#include "AliHMPIDTracker.h" //class header
#include "AliHMPID.h"             //GetTrackPoint(),PropagateBack()   
#include "AliHMPIDCluster.h"      //GetTrackPoint(),PropagateBack() 
#include "AliHMPIDParam.h"        //GetTrackPoint(),PropagateBack()
#include "AliHMPIDRecon.h"        //PropagateBack()
#include <AliESD.h>              //PropagateBack()  
#include <AliRun.h>              //GetTrackPoint(),PropagateBack()  
#include <AliTrackPointArray.h>  //GetTrackPoint()
#include <AliAlignObj.h>         //GetTrackPoint()
ClassImp(AliHMPIDTracker)
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
AliHMPIDTracker::AliHMPIDTracker():AliTracker()
{
// AliHMPIDTracker is created from AliReconstraction::Run() which invokes AliReconstraction::CreateTrackers() 
// which in turn invokes AliHMPIDReconstructor::CreateTracker(). 
// Note that this is done just once per session before AliReconstruction::Run() goes to events loop.
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++    
Bool_t AliHMPIDTracker::GetTrackPoint(Int_t idx, AliTrackPoint& point) const
{
// Interface callback methode invoked from AliReconstruction::WriteAlignmentData() to get position of MIP cluster in MARS associated to a current track.
// MIP cluster is reffered by index which is stored in AliESDtrack  ???????
// Arguments: idx- cluster index which is stored by HMPID in AliESDtrack
//            point- reference to the object where to store the point     
//   Returns: status of operation  if FALSE then AliReconstruction::WriteAlignmentData() do not store this point to array of points for current track. 
  if(idx<0) return kFALSE; //no MIP cluster assigned to this track in PropagateBack()
  Int_t iCham=idx/1000000;
  Int_t iClu=idx%1000000;
  point.SetVolumeID(AliAlignObj::LayerToVolUID(AliAlignObj::kHMPID,iCham-1));//layer and chamber number
  AliHMPID *pRich=((AliHMPID*)gAlice->GetDetector("HMPID"));  
  AliHMPIDCluster *pClu=(AliHMPIDCluster*)pRich->CluLst(iCham)->UncheckedAt(iClu);//get pointer to cluster
  Double_t mars[3];
  AliHMPIDParam::Instance()->Lors2Mars(iCham,pClu->X(),pClu->Y(),mars);
  point.SetXYZ(mars[0],mars[1],mars[2]);
  return kTRUE;
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Int_t AliHMPIDTracker::LoadClusters(TTree *pCluTree)
{
// Interface callback methode invoked from AliReconstruction::RunTracking() to load HMPID clusters before PropagateBack() gets control 
// Arguments: pCluTree- pointer to clusters tree got by AliHMPIDLoader::LoadRecPoints("read") then AliHMPIDLoader::TreeR()
//   Returns: error code (currently ignored in AliReconstruction::RunTraking())    
  AliDebug(1,"Start.");  pCluTree->GetEntry(0);  AliDebug(1,"Stop."); return 0;
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Int_t AliHMPIDTracker::PropagateBack(AliESD *pESD)
{
// Interface callback methode invoked by AliRecontruction::RunTracking() during tracking after TOF. It's done just once per event
// Arguments: pESD - pointer to Event Summary Data class instance which contains a list of tracks
//   Returns: error code, 0 if no errors   
  Int_t iNtracks=pESD->GetNumberOfTracks();  AliDebug(1,Form("Start with %i tracks",iNtracks));
  AliHMPID *pRich=((AliHMPID*)gAlice->GetDetector("HMPID"));  
  AliHMPIDRecon recon;                                                        //instance of reconstruction class, nothing important in ctor
   
  AliHMPIDParam *pParam=AliHMPIDParam::Instance();

  for(Int_t iTrk=0;iTrk<iNtracks;iTrk++){                                                        //ESD tracks loop
    AliESDtrack *pTrk = pESD->GetTrack(iTrk);                                                    //get next reconstructed track    
        
    Float_t xRa=0,yRa=0,xPc=0,yPc=0,th=0,ph=0;                                                   //track intersection point and angles, LORS  
    Int_t iCh=-1;                                                                                //intersected chamber 
    for(Int_t i=0;i<7;i++){                                                                      //chambers loop
      Double_t p1[3],n1[3]; pParam->Norm(i,n1); pParam->Lors2Mars(i,0,0,p1,AliHMPIDParam::kRad);  //point & norm  for RAD
      Double_t p2[3],n2[3]; pParam->Norm(i,n2); pParam->Lors2Mars(i,0,0,p2,AliHMPIDParam::kPc);   //point & norm  for PC
      
      if(pTrk->Intersect(p1,n1,-GetBz())==kFALSE) continue;                                      //try to intersect track with the middle of radiator
      if(pTrk->Intersect(p2,n2,-GetBz())==kFALSE) continue;                                      //try to intersect track with PC
      
      pParam->Mars2LorsVec(i,n1,th,ph);                                                          //track angles
      pParam->Mars2Lors   (i,p1,xRa,yRa);                                                        //TRKxRAD position
      pParam->Mars2Lors   (i,p2,xPc,yPc);                                                        //TRKxPC position
      
      if(AliHMPIDDigit::IsInside(xPc,yPc)==kFALSE) continue;                                      //not in active area  
      iCh=i;
      break;
    }//chambers loop      
    
    if(iCh==-1) continue;                                                                  //no intersection at all, go after next track
    
    TClonesArray *pCluLst=pRich->CluLst(iCh);                                              //get clusters list for intersected chamber
    
    Double_t    dMin=999;                                                                  //distance between track-PC intersection point and current cluster
    Int_t   iMip=-1;                                                                       //index of cluster nearest to intersection point
    for(Int_t iClu=0;iClu<pCluLst->GetEntries();iClu++){                                   //clusters loop for intersected chamber
      AliHMPIDCluster *pClu=(AliHMPIDCluster*)pCluLst->At(iClu);                             //get pointer to current cluster
      if(pClu->Q()<100) continue;                                                          //QDC is incompartible with mip, go after another one
      
      Float_t dX=xPc-pClu->X();                                                            //distance between current cluster and intersection point
      Float_t dY=yPc-pClu->Y();
      Float_t d =TMath::Sqrt(dX*dX+dY*dY);
      
      if( d < dMin) {iMip=iClu; dMin=d;}                                                   //current cluster is closer, overwrite data for min cluster
    }//clusters loop for intersected chamber    
    
                   pTrk->SetHMPIDtrk      (xPc,yPc,th,ph);                                  //store track info
    if(iMip==-1)  {pTrk->SetHMPIDsignal   (kMipQdcCut);  continue;}                         //no clusters with QDC more the threshold at all
    
    AliHMPIDCluster *pMipClu=(AliHMPIDCluster*)pCluLst->At(iMip);                            //take mip cluster 
    
                   pTrk->SetHMPIDmip      (pMipClu->X(),pMipClu->Y(),pMipClu->Q());          //store mip info 
    if(dMin>1)    {pTrk->SetHMPIDsignal   (kMipDistCut); continue;}                          //closest cluster with enough charge is still too far 
                   pTrk->SetHMPIDcluIdx   (iCh,iMip);                                        //set mip cluster index
  recon.SetTrack(th,ph,xRa,yRa); Int_t iNphot=0;                                            //initialize track parameters  
                   pTrk->SetHMPIDsignal   (recon.CkovAngle(pCluLst,iNphot));                 //search for Cerenkov angle for this track
                   pTrk->SetHMPIDchi2     (recon.CkovSigma2());                              //error squared 
                   pTrk->SetHMPIDmip      (pMipClu->X(),pMipClu->Y(),pMipClu->Q(),iMip);     //info on mip cluster + n. phot.
 }//ESD tracks loop
  AliDebug(1,"Stop pattern recognition");
  return 0; // error code: 0=no error;
}//PropagateBack()
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Commit	Line	Data
d3da6dc4	1	#include "AliHMPIDTracker.h" //class header
	2	#include "AliHMPID.h" //GetTrackPoint(),PropagateBack()
	3	#include "AliHMPIDCluster.h" //GetTrackPoint(),PropagateBack()
	4	#include "AliHMPIDParam.h" //GetTrackPoint(),PropagateBack()
	5	#include "AliHMPIDRecon.h" //PropagateBack()
	6	#include <AliESD.h> //PropagateBack()
	7	#include <AliRun.h> //GetTrackPoint(),PropagateBack()
	8	#include <AliTrackPointArray.h> //GetTrackPoint()
	9	#include <AliAlignObj.h> //GetTrackPoint()
	10	ClassImp(AliHMPIDTracker)
	11	//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
	12	AliHMPIDTracker::AliHMPIDTracker():AliTracker()
	13	{
	14	// AliHMPIDTracker is created from AliReconstraction::Run() which invokes AliReconstraction::CreateTrackers()
	15	// which in turn invokes AliHMPIDReconstructor::CreateTracker().
	16	// Note that this is done just once per session before AliReconstruction::Run() goes to events loop.
	17	}
	18	//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
	19	Bool_t AliHMPIDTracker::GetTrackPoint(Int_t idx, AliTrackPoint& point) const
	20	{
	21	// Interface callback methode invoked from AliReconstruction::WriteAlignmentData() to get position of MIP cluster in MARS associated to a current track.
	22	// MIP cluster is reffered by index which is stored in AliESDtrack ???????
	23	// Arguments: idx- cluster index which is stored by HMPID in AliESDtrack
	24	// point- reference to the object where to store the point
	25	// Returns: status of operation if FALSE then AliReconstruction::WriteAlignmentData() do not store this point to array of points for current track.
	26	if(idx<0) return kFALSE; //no MIP cluster assigned to this track in PropagateBack()
	27	Int_t iCham=idx/1000000;
	28	Int_t iClu=idx%1000000;
	29	point.SetVolumeID(AliAlignObj::LayerToVolUID(AliAlignObj::kHMPID,iCham-1));//layer and chamber number
	30	AliHMPID pRich=((AliHMPID)gAlice->GetDetector("HMPID"));
	31	AliHMPIDCluster pClu=(AliHMPIDCluster)pRich->CluLst(iCham)->UncheckedAt(iClu);//get pointer to cluster
	32	Double_t mars[3];
	33	AliHMPIDParam::Instance()->Lors2Mars(iCham,pClu->X(),pClu->Y(),mars);
	34	point.SetXYZ(mars[0],mars[1],mars[2]);
	35	return kTRUE;
	36	}
	37	//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
	38	Int_t AliHMPIDTracker::LoadClusters(TTree *pCluTree)
	39	{
	40	// Interface callback methode invoked from AliReconstruction::RunTracking() to load HMPID clusters before PropagateBack() gets control
	41	// Arguments: pCluTree- pointer to clusters tree got by AliHMPIDLoader::LoadRecPoints("read") then AliHMPIDLoader::TreeR()
	42	// Returns: error code (currently ignored in AliReconstruction::RunTraking())
	43	AliDebug(1,"Start."); pCluTree->GetEntry(0); AliDebug(1,"Stop."); return 0;
	44	}
	45	//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
	46	Int_t AliHMPIDTracker::PropagateBack(AliESD *pESD)
	47	{
	48	// Interface callback methode invoked by AliRecontruction::RunTracking() during tracking after TOF. It's done just once per event
	49	// Arguments: pESD - pointer to Event Summary Data class instance which contains a list of tracks
	50	// Returns: error code, 0 if no errors
	51	Int_t iNtracks=pESD->GetNumberOfTracks(); AliDebug(1,Form("Start with %i tracks",iNtracks));
	52	AliHMPID pRich=((AliHMPID)gAlice->GetDetector("HMPID"));
	53	AliHMPIDRecon recon; //instance of reconstruction class, nothing important in ctor
	54
	55	AliHMPIDParam *pParam=AliHMPIDParam::Instance();
	56
	57	for(Int_t iTrk=0;iTrk<iNtracks;iTrk++){ //ESD tracks loop
	58	AliESDtrack *pTrk = pESD->GetTrack(iTrk); //get next reconstructed track
	59
	60	Float_t xRa=0,yRa=0,xPc=0,yPc=0,th=0,ph=0; //track intersection point and angles, LORS
	61	Int_t iCh=-1; //intersected chamber
	62	for(Int_t i=0;i<7;i++){ //chambers loop
	63	Double_t p1[3],n1[3]; pParam->Norm(i,n1); pParam->Lors2Mars(i,0,0,p1,AliHMPIDParam::kRad); //point & norm for RAD
	64	Double_t p2[3],n2[3]; pParam->Norm(i,n2); pParam->Lors2Mars(i,0,0,p2,AliHMPIDParam::kPc); //point & norm for PC
65
66	if(pTrk->Intersect(p1,n1,-GetBz())==kFALSE) continue; //try to intersect track with the middle of radiator
67	if(pTrk->Intersect(p2,n2,-GetBz())==kFALSE) continue; //try to intersect track with PC
68
69	pParam->Mars2LorsVec(i,n1,th,ph); //track angles
70	pParam->Mars2Lors (i,p1,xRa,yRa); //TRKxRAD position
71	pParam->Mars2Lors (i,p2,xPc,yPc); //TRKxPC position
72
73	if(AliHMPIDDigit::IsInside(xPc,yPc)==kFALSE) continue; //not in active area
74	iCh=i;
75	break;
76	}//chambers loop
77
78	if(iCh==-1) continue; //no intersection at all, go after next track
79
80	TClonesArray *pCluLst=pRich->CluLst(iCh); //get clusters list for intersected chamber
81
82	Double_t dMin=999; //distance between track-PC intersection point and current cluster
83	Int_t iMip=-1; //index of cluster nearest to intersection point
84	for(Int_t iClu=0;iClu<pCluLst->GetEntries();iClu++){ //clusters loop for intersected chamber
85	AliHMPIDCluster pClu=(AliHMPIDCluster)pCluLst->At(iClu); //get pointer to current cluster
86	if(pClu->Q()<100) continue; //QDC is incompartible with mip, go after another one
87
88	Float_t dX=xPc-pClu->X(); //distance between current cluster and intersection point
89	Float_t dY=yPc-pClu->Y();
90	Float_t d =TMath::Sqrt(dXdX+dYdY);
91
92	if( d < dMin) {iMip=iClu; dMin=d;} //current cluster is closer, overwrite data for min cluster
93	}//clusters loop for intersected chamber
94
95	pTrk->SetHMPIDtrk (xPc,yPc,th,ph); //store track info
96	if(iMip==-1) {pTrk->SetHMPIDsignal (kMipQdcCut); continue;} //no clusters with QDC more the threshold at all
97
98	AliHMPIDCluster pMipClu=(AliHMPIDCluster)pCluLst->At(iMip); //take mip cluster
99
100	pTrk->SetHMPIDmip (pMipClu->X(),pMipClu->Y(),pMipClu->Q()); //store mip info
101	if(dMin>1) {pTrk->SetHMPIDsignal (kMipDistCut); continue;} //closest cluster with enough charge is still too far
102	pTrk->SetHMPIDcluIdx (iCh,iMip); //set mip cluster index
103	recon.SetTrack(th,ph,xRa,yRa); Int_t iNphot=0; //initialize track parameters
104	pTrk->SetHMPIDsignal (recon.CkovAngle(pCluLst,iNphot)); //search for Cerenkov angle for this track
105	pTrk->SetHMPIDchi2 (recon.CkovSigma2()); //error squared
106	pTrk->SetHMPIDmip (pMipClu->X(),pMipClu->Y(),pMipClu->Q(),iMip); //info on mip cluster + n. phot.
d3da6dc4	107	}//ESD tracks loop
	108	AliDebug(1,"Stop pattern recognition");
	109	return 0; // error code: 0=no error;
	110	}//PropagateBack()
	111	//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++