| 1 | //
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| 2 | #ifndef G__TRKUTIL_H
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| 3 | #define G__TRKUTIL_H
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| 4 | //
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| 5 | #include <TVector3.h>
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| 6 | #include <TVectorD.h>
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| 7 | #include <TMatrixDSym.h>
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| 8 | #include <TRandom.h>
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| 9 | //
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| 10 | //
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| 11 | // Class test
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| 12 |
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| 13 | class TrkUtil {
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| 14 | //
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| 15 | //
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| 16 | protected:
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| 17 | Double_t fBz; // Solenoid magnetic field
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| 18 | //
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| 19 | Int_t fGasSel; // Gas selection: 0: He-Iso, 1: He, 2:Ar-Eth, 3: Ar
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| 20 | Double_t fRmin; // Lower DCH radius
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| 21 | Double_t fRmax; // Higher DCH radius
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| 22 | Double_t fZmin; // Lower DCH z
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| 23 | Double_t fZmax; // Higher DCH z
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| 24 | //
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| 25 | // Service routines
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| 26 | //
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| 27 | void SetB(Double_t Bz) { fBz = Bz; }
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| 28 | TVectorD XPtoPar(TVector3 x, TVector3 p, Double_t Q);
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| 29 | TVector3 ParToP(TVectorD Par);
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| 30 | TMatrixDSym RegInv(TMatrixDSym& Min);
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| 31 | //
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| 32 | // Track trajectory derivatives
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| 33 | TMatrixD derXdPar(TVectorD par, Double_t s); // derivatives of position wrt parameters
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| 34 | TVectorD derXds(TVectorD par, Double_t s); // derivatives of position wrt phase
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| 35 | TVectorD dsdPar_R(TVectorD par, Double_t R); // derivatives of phase at constant R
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| 36 | TVectorD dsdPar_z(TVectorD par, Double_t z); // derivatives of phase at constant z
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| 37 | //
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| 38 | // Conversion to ACTS parametrization
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| 39 | //
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| 40 | TVectorD ParToACTS(TVectorD Par); // Parameter conversion
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| 41 | TMatrixDSym CovToACTS(TVectorD Par, TMatrixDSym Cov); // Covariance conversion
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| 42 | //
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| 43 | // Conversion to ILC parametrization
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| 44 | //
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| 45 | TVectorD ParToILC(TVectorD Par); // Parameter conversion
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| 46 | TMatrixDSym CovToILC(TMatrixDSym Cov); // Covariance conversion
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| 47 | //
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| 48 |
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| 49 | public:
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| 50 | //
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| 51 | // Constructors
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| 52 | TrkUtil();
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| 53 | TrkUtil(Double_t Bz);
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| 54 | // Destructor
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| 55 | ~TrkUtil();
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| 56 | //
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| 57 | // Overload methods to allow call without instantiating class
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| 58 | //
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| 59 | static Double_t cSpeed()
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| 60 | {
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| 61 | Double_t c = 2.99792458e8; // speed of light m/sec
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| 62 | //return TMath::C()*1.0e-9; // Incompatible with root5
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| 63 | return c*1.0e-9; // Reduced speed of light
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| 64 | }
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| 65 | //
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| 66 | // Service routines
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| 67 | //
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| 68 | static TVectorD XPtoPar(TVector3 x, TVector3 p, Double_t Q, Double_t Bz);
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| 69 | static TVector3 ParToX(TVectorD Par); // position of minimum distance from z axis
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| 70 | static TVector3 ParToP(TVectorD Par, Double_t Bz); // Get Momentum from track parameters
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| 71 | static Double_t ParToQ(TVectorD Par); // Get track charge
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| 72 | static void LineDistance(TVector3 x0, TVector3 y0, TVector3 dirx, TVector3 diry, Double_t &sx, Double_t &sy, Double_t &distance);
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| 73 | //
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| 74 | // Track trajectory
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| 75 | //
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| 76 | static TVector3 Xtrack(TVectorD par, Double_t s); // Parametric track trajectory
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| 77 | TVectorD derRphi_R(TVectorD par, Double_t R); // Derivatives of R-phi at constant R
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| 78 | TVectorD derZ_R(TVectorD par, Double_t R); // Derivatives of z at constant R
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| 79 | TVectorD derRphi_Z(TVectorD par, Double_t z); // Derivatives of R-phi at constant z
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| 80 | TVectorD derR_Z(TVectorD par, Double_t z); // Derivatives of R at constant z
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| 81 | //
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| 82 | // Smear with given covariance matrix
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| 83 | //
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| 84 | static TVectorD CovSmear(TVectorD x, TMatrixDSym C);
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| 85 | //
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| 86 | // Conversion from meters to mm
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| 87 | //
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| 88 | static TVectorD ParToMm(TVectorD Par); // Parameter conversion
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| 89 | static TMatrixDSym CovToMm(TMatrixDSym Cov); // Covariance conversion
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| 90 | //
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| 91 | // Inside cylindrical volume
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| 92 | //
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| 93 | static Bool_t IsInside(TVector3 x, Double_t Rout, Double_t Zmin, Double_t Zmax)
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| 94 | {
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| 95 | Bool_t Is = kFALSE;
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| 96 | if (x.Pt() <= Rout && x.z() >= Zmin && x.z() <= Zmax)Is = kTRUE;
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| 97 | return Is;
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| 98 | }
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| 99 | //
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| 100 | // Cluster counting in gas
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| 101 | //
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| 102 | void SetBfield(Double_t Bz) { fBz = Bz; }
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| 103 | // Define gas volume (units = meters)
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| 104 | void SetDchBoundaries(Double_t Rmin, Double_t Rmax, Double_t Zmin, Double_t Zmax);
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| 105 | // Gas mixture selection
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| 106 | void SetGasMix(Int_t Opt);
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| 107 | // Get number of ionization clusters
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| 108 | Bool_t IonClusters(Double_t &Ncl, Double_t mass, TVectorD Par);
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| 109 | Double_t Nclusters(Double_t bgam); // mean clusters/meter vs beta*gamma
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| 110 | static Double_t Nclusters(Double_t bgam, Int_t Opt); // mean clusters/meter vs beta*gamma
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| 111 | Double_t funcNcl(Double_t *xp, Double_t *par);
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| 112 | Double_t TrkLen(TVectorD Par); // Track length inside chamber
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| 113 | };
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| 114 |
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| 115 | #endif
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