4 // Implementation of a pair of tracks, for several purposes
5 // - computing the total 4-momentum & inv. mass for output histos filling
6 // - evaluating cut checks on the pair of particles
7 // - evaluating any kind of kinematic value over their sum
9 // authors: Martin Vala (martin.vala@cern.ch)
10 // Alberto Pulvirenti (alberto.pulvirenti@ct.infn.it)
13 #ifndef ALIRSNMOTHER_H
14 #define ALIRSNMOTHER_H
16 #include <TLorentzVector.h>
18 #include "AliRsnEvent.h"
19 #include "AliRsnDaughter.h"
23 class AliRsnMother : public TObject
28 AliRsnMother(const AliRsnMother &obj);
29 AliRsnMother& operator=(const AliRsnMother &obj);
30 virtual ~AliRsnMother();
32 void SetDefaultMass(Double_t mass) {fDefaultMass = mass; fRef.SetXYZM(fSum.X(),fSum.Y(),fSum.Z(),mass); fRefMC.SetXYZM(fSumMC.X(),fSumMC.Y(),fSumMC.Z(),mass);}
33 TLorentzVector& Sum() {return fSum;}
34 TLorentzVector& Ref() {return fRef;}
35 TLorentzVector& SumMC() {return fSumMC;}
36 TLorentzVector& RefMC() {return fRefMC;}
37 Double_t OpeningAngle(Bool_t mc = kFALSE) const {if (fDaughter[0] && fDaughter[1]) return fDaughter[0]->P(mc).Angle(fDaughter[1]->P(mc).Vect()); return 1E6;}
38 Double_t AngleTo(AliRsnDaughter track, Bool_t mc = kFALSE) const {return fSum.Angle(track.P(mc).Vect());}
39 Double_t CosThetaStar(Bool_t first = kTRUE, Bool_t useMC = kFALSE);
41 AliRsnDaughter* GetDaughter (const Int_t &index) const {if (index==0||index==1) return fDaughter[index]; return 0x0;}
42 AliRsnDaughter& GetDaughterRef(const Int_t &index) const {if (index==1) return (*fDaughter[1]); return (*fDaughter[0]);}
44 Bool_t IsLabelEqual() const {return abs(fDaughter[0]->GetLabel()) == abs(fDaughter[1]->GetLabel());}
45 Bool_t IsIndexEqual() const {return (fDaughter[0]->GetID() == fDaughter[1]->GetID());}
46 Int_t CommonMother(Int_t &m0, Int_t &m1) const;
47 Int_t CommonMother() const {Int_t d0, d1; return CommonMother(d0,d1);}
49 void SetDaughters(AliRsnDaughter * const daughter1, Double_t mass1, AliRsnDaughter * const daughter2, Double_t mass2);
51 void PrintInfo(const Option_t *option = "ALL") const;
52 Bool_t CheckPair() const;
53 Bool_t MatchesDef(AliRsnPairDef *pairDef);
57 Bool_t fUseMC; // choose if momenta are taken from ESD/AOD or MC
58 Double_t fDefaultMass; // nominal resonance mass
59 AliRsnDaughter *fDaughter[2]; // elements of the pair
60 TLorentzVector fSum; // sum computed from the two daughters
61 TLorentzVector fSumMC; // sum computed from the two daughters
62 TLorentzVector fRef; // a 4-vector with same momentum as the sum but the nominal mass of mother
63 TLorentzVector fRefMC; // a 4-vector with same momentum as the sum but the nominal mass of mother
65 ClassDef(AliRsnMother,1)