40bb7232aa749af01ac412791a5c7345ef6f81cf
[u/mrichter/AliRoot.git] / JETAN / AliJetParticlesReaderHLT.cxx
1 // $Id$
2
3 //___________________________________________________________________________
4 /////////////////////////////////////////////////////////////////////////////
5 //                                                                         //
6 // File reader for HLT tracks ESD                                          //
7 //                                                                         //
8 // loizides@ikf.uni-frankfurt.de                                           //
9 /////////////////////////////////////////////////////////////////////////////
10
11 #include <Riostream.h>
12 #include <TMath.h>
13 #include <TString.h>
14 #include <TObjString.h>
15 #include <TTree.h>
16 #include <TFile.h>
17 #include <AliESD.h>
18 #include <AliESDtrack.h>
19 #include <AliESDHLTtrack.h>
20 #include <AliL3Track.h>
21 #include <AliL3Vertex.h>
22 #include <AliKalmanTrack.h>
23 #include <AliJetEventParticles.h>
24 #include "AliJetParticlesReaderHLT.h"
25
26 ClassImp(AliJetParticlesReaderHLT)
27
28 AliJetParticlesReaderHLT::AliJetParticlesReaderHLT(Bool_t bMapper, const Char_t* esdfilename) :
29   AliJetParticlesReaderESD(0,esdfilename),
30   fTrackerType(bMapper),
31   fMinHits(0),
32   fMinWeight(0)
33 {
34   //constructor
35 }
36
37 /********************************************************************/
38   
39 AliJetParticlesReaderHLT::AliJetParticlesReaderHLT(
40                                       Bool_t bMapper,
41                                       TObjArray* dirs,
42                                       const Char_t* esdfilename) :
43   AliJetParticlesReaderESD(0,dirs,esdfilename),
44   fTrackerType(bMapper),
45   fMinHits(0),
46   fMinWeight(0)
47
48 {
49   //constructor
50 }
51
52 /********************************************************************/
53
54 AliJetParticlesReaderHLT::~AliJetParticlesReaderHLT()
55 {
56   //desctructor
57 }
58
59 Int_t AliJetParticlesReaderHLT::ReadESD(AliESD* esd)
60 {
61   //Reads one ESD
62
63   if (esd == 0)
64    {
65      Error("ReadESD","ESD is NULL");
66      return kFALSE;
67    }
68
69   Float_t mf = esd->GetMagneticField(); 
70   if (mf <= 0.0)  
71   {
72      Error("ReadESD","Magnetic Field is 0. Skipping to next event.");
73      return kFALSE;
74   }
75   AliKalmanTrack::SetMagneticField(mf/10.);
76
77   Info("ReadESD","Reading Event %d",fCurrentDir*1000+fCurrentEvent);
78   if((!fOwner) || (fEventParticles==0)) 
79     fEventParticles = new AliJetEventParticles();
80
81   Int_t ntr=0;
82   if(fTrackerType){
83     ntr =esd->GetNumberOfHLTHoughTracks();
84     Info("ReadESD","Found %d conformal tracks.",ntr);
85   } else {
86     ntr=esd->GetNumberOfHLTHoughTracks();
87     Info("ReadESD","Found %d hough tracks.",ntr);
88   }
89   fEventParticles->Reset(ntr);
90
91   TString headdesc="";
92   headdesc+="Run ";
93   headdesc+=esd->GetRunNumber();
94   headdesc+=": Ev ";
95   headdesc+=esd->GetEventNumber();
96   fEventParticles->SetHeader(headdesc);
97
98   Double_t vertexpos[3];//vertex position
99   const AliESDVertex* kvertex = esd->GetVertex();
100   if (kvertex == 0)
101    {
102      Info("ReadESD","ESD returned NULL pointer to vertex - assuming (0.0,0.0,0.0)");
103      vertexpos[0] = 0.0;
104      vertexpos[1] = 0.0;
105      vertexpos[2] = 0.0;
106    }
107   else
108    {
109      kvertex->GetXYZ(vertexpos);
110    }
111
112   fEventParticles->SetVertex(vertexpos[0],vertexpos[1],vertexpos[2]);
113
114   AliL3Track l3;
115   AliL3Vertex v;
116   v.SetX(vertexpos[0]);
117   v.SetY(vertexpos[1]);
118   v.SetZ(vertexpos[2]);
119   Double_t xc=0.,yc=0.,zc=0.;
120   for (Int_t i = 0;i<ntr; i++) {
121     AliESDHLTtrack *kesdtrack;
122     if(fTrackerType){
123       kesdtrack=esd->GetHLTConfMapTrack(i);
124     } else {
125       kesdtrack=esd->GetHLTHoughTrack(i);
126     }
127
128     if (kesdtrack == 0)
129       {
130         Error("ReadESD","Can not get track %d", i);
131         continue;
132       }
133
134     //const Float_t kpid=kesdtrack->GetPID();
135     const Int_t knhits=kesdtrack->GetNHits();
136     const Int_t kweight=kesdtrack->GetWeight();
137     //cout << i << " " << kweight << " " << knhits << endl;
138     if((fMinHits>0) && (knhits<fMinHits)) continue;    
139     if(kweight>1000) continue; //avoid ghosts 
140     if((fMinWeight>0) && (kweight<fMinWeight)) continue;
141
142     Float_t px=kesdtrack->GetPx();
143     Float_t py=kesdtrack->GetPy();
144     Float_t pz=kesdtrack->GetPz();
145
146     if(fTrackerType){
147       //if(!kesdtrack->ComesFromMainVertex()) continue;
148       l3.SetFirstPoint(kesdtrack->GetFirstPointX(),kesdtrack->GetFirstPointY(),kesdtrack->GetFirstPointZ());
149       l3.SetLastPoint(kesdtrack->GetLastPointX(),kesdtrack->GetLastPointY(),kesdtrack->GetLastPointZ());
150       l3.SetCharge(kesdtrack->GetCharge());
151       l3.SetPt(kesdtrack->GetPt());
152       l3.SetTgl(kesdtrack->GetTgl());
153       l3.SetPsi(kesdtrack->GetPsi());
154       l3.CalculateHelix();
155       l3.GetClosestPoint(&v,xc,yc,zc);
156       if(TMath::Abs(zc)>10.) continue;
157       l3.SetFirstPoint(vertexpos[0],vertexpos[1],vertexpos[2]);
158       l3.UpdateToFirstPoint();
159       px=l3.GetPx();
160       py=l3.GetPy();
161       pz=l3.GetPz();
162     }
163
164     const Float_t kpt=TMath::Sqrt(px*px+py*py);
165     const Float_t kp=TMath::Sqrt(pz*pz+kpt*kpt);
166     const Float_t keta=0.5*TMath::Log((kp+pz+1e-30)/(kp-pz+1e-30)); 
167     const Float_t kphi=TMath::Pi()+TMath::ATan2(-py,-px);
168
169     if(IsAcceptedParticle(kpt,kphi,keta))
170       fEventParticles->AddParticle(px,py,pz,kp,i,kesdtrack->GetMCid(),knhits,kpt,kphi,keta);
171   } //loop over tracks
172
173   return kTRUE;
174 }