Label for the ITS tracklets (Jan Fiete)
[u/mrichter/AliRoot.git] / HMPID / AliHMPIDTracker.cxx
CommitLineData
3c6274c1 1#include "AliHMPIDTracker.h" //class header
2#include "AliHMPIDCluster.h" //GetTrackPoint(),PropagateBack()
3#include "AliHMPIDParam.h" //GetTrackPoint(),PropagateBack()
59d9d4b3 4#include "AliHMPIDRecon.h" //Recon()
57fcdc2b 5#include "AliHMPIDReconHTA.h" //ReconHTA()
6#include <AliESDEvent.h> //PropagateBack(),Recon()
7#include <AliESDtrack.h> //Intersect()
d3da6dc4 8#include <AliRun.h> //GetTrackPoint(),PropagateBack()
9#include <AliTrackPointArray.h> //GetTrackPoint()
10#include <AliAlignObj.h> //GetTrackPoint()
59d9d4b3 11#include <AliCDBManager.h> //PropageteBack()
12#include <AliCDBEntry.h> //PropageteBack()
423554a3 13//.
14// HMPID base class fo tracking
15//.
16//.
17//.
d3da6dc4 18ClassImp(AliHMPIDTracker)
94b1fbfa 19//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
c61a7285 20AliHMPIDTracker::AliHMPIDTracker():
21 AliTracker(),
22 fClu(new TObjArray(AliHMPIDParam::kMaxCh+1))
94b1fbfa 23{
59d9d4b3 24// ctor. Create TObjArray of TClonesArray of AliHMPIDCluster
25//
26//
c61a7285 27 fClu->SetOwner(kTRUE);
ae5a42aa 28 for(int i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++) fClu->AddAt(new TClonesArray("AliHMPIDCluster"),i);
59d9d4b3 29}//ctor
d3da6dc4 30//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
31Bool_t AliHMPIDTracker::GetTrackPoint(Int_t idx, AliTrackPoint& point) const
32{
33// Interface callback methode invoked from AliReconstruction::WriteAlignmentData() to get position of MIP cluster in MARS associated to a current track.
34// MIP cluster is reffered by index which is stored in AliESDtrack ???????
35// Arguments: idx- cluster index which is stored by HMPID in AliESDtrack
36// point- reference to the object where to store the point
37// Returns: status of operation if FALSE then AliReconstruction::WriteAlignmentData() do not store this point to array of points for current track.
38 if(idx<0) return kFALSE; //no MIP cluster assigned to this track in PropagateBack()
59d9d4b3 39 Int_t iCham=idx/1000000; Int_t iClu=idx%1000000;
ae079791 40 point.SetVolumeID(AliGeomManager::LayerToVolUID(AliGeomManager::kHMPID,iCham-1));//layer and chamber number
94b1fbfa 41 TClonesArray *pArr=(TClonesArray*)(*fClu)[iCham];
42 AliHMPIDCluster *pClu=(AliHMPIDCluster*)pArr->UncheckedAt(iClu);//get pointer to cluster
d3da6dc4 43 Double_t mars[3];
44 AliHMPIDParam::Instance()->Lors2Mars(iCham,pClu->X(),pClu->Y(),mars);
45 point.SetXYZ(mars[0],mars[1],mars[2]);
46 return kTRUE;
59d9d4b3 47}//GetTrackPoint()
48//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
49Int_t AliHMPIDTracker::IntTrkCha(AliESDtrack *pTrk,Float_t &xPc,Float_t &yPc)
50{
51// Static method to find intersection in between given track and HMPID chambers
52// Arguments: pTrk- ESD track; xPc,yPc- track intersection with PC in LORS [cm]
53// Returns: intersected chamber ID or -1
54 AliHMPIDParam *pParam=AliHMPIDParam::Instance();
55 Float_t xRa=0,yRa=0,theta=0,phi=0; //track intersection at PC and angles at RAD, LORS
ae5a42aa 56 for(Int_t i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++){ //chambers loop
59d9d4b3 57 Double_t p1[3],n1[3]; pParam->Norm(i,n1); pParam->Point(i,p1,AliHMPIDParam::kRad); //point & norm for middle of radiator plane
58 Double_t p2[3],n2[3]; pParam->Norm(i,n2); pParam->Point(i,p2,AliHMPIDParam::kPc); //point & norm for entrance to PC plane
59 if(pTrk->Intersect(p1,n1,-GetBz())==kFALSE) continue; //try to intersect track with the middle of radiator
60 if(pTrk->Intersect(p2,n2,-GetBz())==kFALSE) continue; //try to intersect track with PC
61 pParam->Mars2LorsVec(i,n1,theta,phi); //track angles at RAD
62 pParam->Mars2Lors (i,p1,xRa,yRa); //TRKxRAD position
63 pParam->Mars2Lors (i,p2,xPc,yPc); //TRKxPC position
ae5a42aa 64 if(AliHMPIDParam::IsInside(xPc,yPc,pParam->DistCut())==kFALSE) continue; //not in active area
59d9d4b3 65 pTrk->SetHMPIDtrk (xRa,yRa,theta,phi); //store track intersection info
66 pTrk->SetHMPIDcluIdx (i,0);
67 return i;
68 } //chambers loop
69 return -1; //no intersection with HMPID chambers
70}//IntTrkCha()
d3da6dc4 71//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
72Int_t AliHMPIDTracker::LoadClusters(TTree *pCluTree)
73{
59d9d4b3 74// Interface callback methode invoked from AliReconstruction::RunTracking() to load HMPID clusters before PropagateBack() gets control. Done once per event.
d3da6dc4 75// Arguments: pCluTree- pointer to clusters tree got by AliHMPIDLoader::LoadRecPoints("read") then AliHMPIDLoader::TreeR()
76// Returns: error code (currently ignored in AliReconstruction::RunTraking())
ae5a42aa 77 for(int i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++) pCluTree->SetBranchAddress(Form("HMPID%d",i),&((*fClu)[i]));
94b1fbfa 78 pCluTree->GetEntry(0);
94b1fbfa 79 return 0;
59d9d4b3 80}//LoadClusters()
d3da6dc4 81//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
af885e0f 82Int_t AliHMPIDTracker::PropagateBack(AliESDEvent *pEsd)
abb5f786 83{
59d9d4b3 84// Interface pure virtual in AliTracker. Invoked from AliReconstruction::RunTracking() after invocation of AliTracker::LoadClusters() once per event
abb5f786 85// Agruments: pEsd - pointer to ESD
86// Returns: error code
f6998a13 87 AliCDBEntry *pNmeanEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Nmean"); //contains TObjArray of 21 TF1
49881df7 88 AliCDBEntry *pQthreEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Qthre"); //contains TObjArray of 42 (7ch * 6sec) TF1
abb5f786 89 if(!pNmeanEnt) AliFatal("No Nmean C6F14 ");
90 if(!pQthreEnt) AliFatal("No Qthre");
94b1fbfa 91
afe12692 92 return Recon(pEsd,fClu,(TObjArray*)pNmeanEnt->GetObject(),(TObjArray*)pQthreEnt->GetObject());
611e810d 93}//PropagateBack()
abb5f786 94//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
afe12692 95Int_t AliHMPIDTracker::Recon(AliESDEvent *pEsd,TObjArray *pClus,TObjArray *pNmean, TObjArray *pQthre)
d3da6dc4 96{
59d9d4b3 97// Static method to reconstruct Theta Ckov for all valid tracks of a given event.
98// Arguments: pEsd- pointer ESD; pClu- pointer to clusters for all chambers; pNmean - pointer to all function Nmean=f(time)
d3da6dc4 99// Returns: error code, 0 if no errors
abb5f786 100 AliHMPIDRecon recon; //instance of reconstruction class, nothing important in ctor
59d9d4b3 101 Float_t xPc,yPc;
102 for(Int_t iTrk=0;iTrk<pEsd->GetNumberOfTracks();iTrk++){ //ESD tracks loop
103 AliESDtrack *pTrk = pEsd->GetTrack(iTrk); //get reconstructed track
a591e55f 104 Int_t cham=IntTrkCha(pTrk,xPc,yPc); //get chamber intersected by this track
59280a5a 105 if(cham<0) continue; //no intersection at all, go after next track
a591e55f 106 Double_t nmean=((TF1*)pNmean->At(3*cham))->Eval(pEsd->GetTimeStamp()); //C6F14 Nmean for this chamber
49881df7 107 Int_t hvsec = AliHMPIDParam::InHVSector(xPc,yPc);
108 Double_t qthre=((TF1*)pQthre->At(6*cham+hvsec))->Eval(pEsd->GetTimeStamp());
a591e55f 109 recon.SetImpPC(xPc,yPc); //store track impact to PC
afe12692 110 recon.CkovAngle(pTrk,(TClonesArray *)pClus->At(cham),nmean,qthre); //search for Cerenkov angle of this track
8d6043fc 111// Printf("AliHMPIDTracker::Recon: nmean %f, qthre %f",nmean,qthre);
59280a5a 112 } //ESD tracks loop
d3da6dc4 113 return 0; // error code: 0=no error;
611e810d 114}//Recon()
115//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
49881df7 116Int_t AliHMPIDTracker::ReconHiddenTrk(Int_t iCh,Int_t iHVsec,AliESDtrack *pTrk,TClonesArray *pCluLst,TObjArray *pNmean,TObjArray *pQthre)
611e810d 117{
118// Static method to reconstruct Theta Ckov for all valid tracks of a given event.
afe12692 119// 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)
611e810d 120// Returns: error code, 0 if no errors
57fcdc2b 121 AliHMPIDReconHTA reconHTA; //instance of reconstruction class, nothing important in ctor
611e810d 122 Double_t nmean=((TF1*)pNmean->At(3*iCh))->Eval(0); //C6F14 Nmean for this chamber
49881df7 123 Double_t qthre=((TF1*)pQthre->At(iCh+iHVsec))->Eval(0); //C6F14 Nmean for this chamber
611e810d 124 if(pCluLst->GetEntriesFast()<4) return 1; //min 4 clusters (3 + 1 mip) to find a ring!
57fcdc2b 125 if(reconHTA.CkovHiddenTrk(pTrk,pCluLst,nmean,qthre)) return 0; //search for track parameters and Cerenkov angle of this track
5b2b2013 126 else return 1; // error code: 0=no error,1=fit not performed;
611e810d 127}//Recon()
d3da6dc4 128//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++