seed::TExampleTrack

class description - source file - inheritance tree

class seed::TExampleTrack : public TLorentzVector


    public:

        seed::TExampleTrack TExampleTrack(const TLorentzVector& momentum = TLorentzVector(), const TVector3& pos = TVector3(), Float_t charge = 0, Double_t chisq = -1, Int_t nhits = -1)
        seed::TExampleTrack TExampleTrack(const TLorentzVector& momentum, const TVector3& pos, const TVector3& pos_err, Float_t charge, Double_t chisq, Int_t nhits)
        seed::TExampleTrack TExampleTrack(const seed::TExampleTrack&)
               virtual void ~TExampleTrack()
             static TClass* Class()
            static Double_t Eta_from_theta(Double_t theta)
                    Float_t GetCharge() const
                   Double_t GetChiSq() const
                   Double_t GetLambda2D(const TVector3& refpoint = TVector3(0,0,0)) const
      const TLorentzVector& GetMomentum() const
                      Int_t GetNhits() const
                   TVector3 GetPCA() const
            const TVector3& GetPosition() const
            const TVector3& GetPositionError() const
                   Double_t GetTanl() const
            virtual TClass* IsA() const
                       void Set(const seed::TExampleTrack& track)
                       void Set(const TLorentzVector& lv, const TVector3& pos, const TVector3& pos_err, Float_t charge = 0, Double_t chisq = -1, Int_t nhits = -1)
                       void Set(const TVector3& pos, const TVector3& pos_err, Float_t charge = 0, Double_t chisq = -1, Int_t nhits = -1)
                       void SetPtTanlPhiE(Double_t pt, Double_t tanl, Double_t phi, Double_t E)
                       void SetPtTanlPhiM(Double_t pt, Double_t tanl, Double_t phi, Double_t M)
                       void SetTanl(Double_t tanl)
               virtual void ShowMembers(TMemberInspector& insp, char* parent)
               virtual void Streamer(TBuffer& b)
                       void StreamerNVirtual(TBuffer& b)
            static Double_t Tanl_from_theta(Double_t theta)
            static Double_t Theta_from_eta(Double_t eta)
            static Double_t Theta_from_tanl(Double_t tanl)

Data Members


    protected:

      TVector3 fPos     a point on the track
      TVector3 fPosErr  error on this point
       Float_t fCharge  the charge of the particle (0 is undetermined/uninitialized) (it's float, not int: hypothetically you can store "quark tracks")
         Int_t fNhits   number of hits on this track
      Double_t fChisq   track reconstruction chi2

Class Description

 A track is a TLorentzVector, which is the 4-momentum, plus a position on the
 track.
 Note that this is not the standard way of parametrizing a track in track
 reconstruction software.

 Author: Paul Balm <mailto:p.balm@nikhef.nl>
 @(#) Feb 12, 2002

TExampleTrack(const TLorentzVector & momentum, const TVector3 & pos, Float_t charge, Double_t chisq, Int_t nhits): TLorentzVector(momentum), fPos(pos), fPosErr(), fCharge(charge), fNhits(nhits), fChisq(chisq)

 Constructor initializing all member and base class variables, except error on the position.

TExampleTrack(const TLorentzVector & momentum, const TVector3 & pos, const TVector3 & pos_err, Float_t charge, Double_t chisq, Int_t nhits): TLorentzVector(momentum), fPos(pos), fPosErr(pos_err), fCharge(charge), fNhits(nhits), fChisq(chisq)

 Constructor initializing all member and base class variables.

TVector3 GetPCA() const

 Get the point (a TVector3) of closest approach to the beam axis.

Double_t GetLambda2D(const TVector3& refpoint) const

 If you parametrize the track as a straight line:
 point_on_track(lambda) = fPos + lambda*momentum
 then this method will give you lambda at DCA of
 this track in the xy-plane to refpoint.

 Calculation:
 lambda = ((refpoint-pos) dot momentum) /(|momentum|^2)
        = vp dot momentum/ pT^2

Inline Functions

                         void Set(const seed::TExampleTrack& track)
                         void Set(const TLorentzVector& lv, const TVector3& pos, const TVector3& pos_err, Float_t charge = 0, Double_t chisq = -1, Int_t nhits = -1)
                         void SetPtTanlPhiE(Double_t pt, Double_t tanl, Double_t phi, Double_t E)
                         void SetPtTanlPhiM(Double_t pt, Double_t tanl, Double_t phi, Double_t M)
                         void Set(const TVector3& pos, const TVector3& pos_err, Float_t charge = 0, Double_t chisq = -1, Int_t nhits = -1)
                         void SetTanl(Double_t tanl)
              const TVector3& GetPosition() const
              const TVector3& GetPositionError() const
        const TLorentzVector& GetMomentum() const
                     Double_t GetTanl() const
                      Float_t GetCharge() const
                     Double_t GetChiSq() const
                        Int_t GetNhits() const
                     Double_t Theta_from_tanl(Double_t tanl)
                     Double_t Tanl_from_theta(Double_t theta)
                     Double_t Eta_from_theta(Double_t theta)
                     Double_t Theta_from_eta(Double_t eta)
                      TClass* Class()
                      TClass* IsA() const
                         void ShowMembers(TMemberInspector& insp, char* parent)
                         void Streamer(TBuffer& b)
                         void StreamerNVirtual(TBuffer& b)
          seed::TExampleTrack TExampleTrack(const seed::TExampleTrack&)
                         void ~TExampleTrack()

Author: Paul Balm
Last update: Feb 12, 2002

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seed::TExampleTrack

class seed::TExampleTrack : public TLorentzVector

Data Members

See also

Class Description

Inline Functions