1 #ifndef ALIDIELECTRONPAIR_H
2 #define ALIDIELECTRONPAIR_H
3 /* Copyright(c) 1998-2009, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
6 //#############################################################
8 //# AliDielectronPair #
9 //# Class to store pair information #
13 //# Anton Andronic, GSI / A.Andronic@gsi.de #
14 //# Ionut C. Arsene, GSI / I.C.Arsene@gsi.de #
15 //# Julian Book, Uni Ffm / Julian.Book@cern.ch #
16 //# Frederick Kramer, Uni Ffm, / Frederick.Kramer@cern.ch #
17 //# Magnus Mager, CERN / Magnus.Mager@cern.ch #
18 //# WooJin J. Park, GSI / W.J.Park@gsi.de #
19 //# Jens Wiechula, Uni HD / Jens.Wiechula@cern.ch #
21 //#############################################################
25 #include <TLorentzVector.h>
27 #include <AliKFParticle.h>
28 #include <AliVParticle.h>
29 #include <AliVEvent.h>
35 //TODO: Should we inherit from AliVTrack in order to built another AliDielectronPair of KF with it?
37 class AliDielectronPair : public AliVParticle {
40 virtual ~AliDielectronPair();
42 AliDielectronPair(AliVTrack * const particle1, Int_t pid1,
43 AliVTrack * const particle2, Int_t pid2, Char_t type);
45 AliDielectronPair(const AliKFParticle * const particle1,
46 const AliKFParticle * const particle2,
47 AliVTrack * const refParticle1,
48 AliVTrack * const refParticle2,
51 //TODO: copy constructor + assignment operator
53 void SetTracks(AliVTrack * const particle1, Int_t pid1,
54 AliVTrack * const particle2, Int_t pid2);
56 void SetGammaTracks(AliVTrack * const particle1, Int_t pid1,
57 AliVTrack * const particle2, Int_t pid2);
60 void SetTracks(const AliKFParticle * const particle1,
61 const AliKFParticle * const particle2,
62 AliVTrack * const refParticle1,
63 AliVTrack * const refParticle2);
65 //AliVParticle interface
67 virtual Double_t Px() const { return fPair.GetPx(); }
68 virtual Double_t Py() const { return fPair.GetPy(); }
69 virtual Double_t Pz() const { return fPair.GetPz(); }
70 virtual Double_t Pt() const { return fPair.GetPt(); }
71 virtual Double_t P() const { return fPair.GetP(); }
72 virtual Bool_t PxPyPz(Double_t p[3]) const { p[0]=Px(); p[1]=Py(); p[2]=Pz(); return kTRUE; }
74 virtual Double_t Xv() const { return fPair.GetX(); }
75 virtual Double_t Yv() const { return fPair.GetY(); }
76 virtual Double_t Zv() const { return fPair.GetZ(); }
77 virtual Bool_t XvYvZv(Double_t x[3]) const { x[0]=Xv(); x[1]=Yv(); x[2]=Zv(); return kTRUE; }
79 virtual Double_t OneOverPt() const { return Pt()>0.?1./Pt():0.; } //TODO: check
80 virtual Double_t Phi() const { return fPair.GetPhi();}
81 virtual Double_t Theta() const { return Pz()!=0?TMath::ATan(Pt()/Pz()):0.; } //TODO: check
84 virtual Double_t E() const { return fPair.GetE(); }
85 virtual Double_t M() const { return fPair.GetMass(); }
87 virtual Double_t Eta() const { return fPair.GetEta();}
88 virtual Double_t Y() const {
89 if((E()*E()-Px()*Px()-Py()*Py()-Pz()*Pz())>0.) return TLorentzVector(Px(),Py(),Pz(),E()).Rapidity();
93 virtual Short_t Charge() const { return fPair.GetQ();}
94 virtual Int_t GetLabel() const { return fLabel; }
96 virtual const Double_t *PID() const { return 0;} //TODO: check
99 // Double_t GetLXY(const AliVVertex * const vtx) const;
100 // Double_t GetPseudoProperTime(const AliVVertex * const vtx) const;
103 UChar_t GetType() const { return fType; }
104 void SetType(Char_t type) { fType=type; }
105 static void SetBeamEnergy(AliVEvent *ev, Double_t beamEbyHand=-1.);
108 void SetLabel(Int_t label) {fLabel=label;}
109 void SetPdgCode(Int_t pdgCode) { fPdgCode=pdgCode; }
110 Int_t PdgCode() const {return fPdgCode;}
112 void SetProductionVertex(const AliKFParticle &Vtx) { fPair.SetProductionVertex(Vtx); }
114 //inter leg information
115 Double_t GetKFChi2() const { return fPair.GetChi2(); }
116 Int_t GetKFNdf() const { return fPair.GetNDF(); }
117 Double_t OpeningAngle() const { return fD1.GetAngle(fD2); }
118 Double_t DistanceDaughters() const { return fD1.GetDistanceFromParticle(fD2); }
119 Double_t DistanceDaughtersXY() const { return fD1.GetDistanceFromParticleXY(fD2); }
120 Double_t DeviationDaughters() const { return fD1.GetDeviationFromParticle(fD2); }
121 Double_t DeviationDaughtersXY() const { return fD1.GetDeviationFromParticleXY(fD2); }
122 Double_t DeltaEta() const { return TMath::Abs(fD1.GetEta()-fD2.GetEta()); }
123 Double_t DeltaPhi() const { Double_t dphi=TMath::Abs(fD1.GetPhi()-fD2.GetPhi());
124 return (dphi>TMath::Pi())?dphi-TMath::Pi():dphi; }
126 // calculate cos(theta*) and phi* in HE and CS pictures
127 void GetThetaPhiCM(Double_t &thetaHE, Double_t &phiHE, Double_t &thetaCS, Double_t &phiCS) const;
129 Double_t ThetaPhiCM(Bool_t isHE, Bool_t isTheta) const;
130 static Double_t ThetaPhiCM(const AliVParticle* d1, const AliVParticle* d2,
131 const Bool_t isHE, const Bool_t isTheta);
133 Double_t PsiPair(Double_t MagField)const; //Angle cut w.r.t. to magnetic field
134 Double_t PhivPair(Double_t MagField)const; //Angle of ee plane w.r.t. to magnetic field
135 Double_t GetCosPointingAngle(const AliVVertex *primVtx) const;
136 // internal KF particle
137 const AliKFParticle& GetKFParticle() const { return fPair; }
138 const AliKFParticle& GetKFFirstDaughter() const { return fD1; }
139 const AliKFParticle& GetKFSecondDaughter() const { return fD2; }
141 // daughter references
142 void SetRefFirstDaughter(AliVParticle * const track) {fRefD1 = track;}
143 void SetRefSecondDaughter(AliVParticle * const track) {fRefD2 = track;}
145 AliVParticle* GetFirstDaughter() const { return dynamic_cast<AliVParticle*>(fRefD1.GetObject()); }
146 AliVParticle* GetSecondDaughter() const { return dynamic_cast<AliVParticle*>(fRefD2.GetObject()); }
148 void SetKFUsage(Bool_t KFUsage) {fKFUsage = KFUsage;}
149 Bool_t GetKFUsage() const {return fKFUsage;}
154 Char_t fType; // type of the pair e.g. like sign SE, unlike sign SE, ... see AliDielectron
155 Int_t fLabel; // MC label
156 Int_t fPdgCode; // pdg code in case it is a MC particle
157 static Double_t fBeamEnergy; //!beam energy
159 AliKFParticle fPair; // KF particle internally used for pair calculation
160 AliKFParticle fD1; // KF particle first daughter
161 AliKFParticle fD2; // KF particle1 second daughter
163 TRef fRefD1; // Reference to first daughter
164 TRef fRefD2; // Reference to second daughter
166 Bool_t fKFUsage; // Use KF for vertexing
168 ClassDef(AliDielectronPair,5)