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G4MuonDecayChannelWithSpin.hh
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25 //
26 // ------------------------------------------------------------
27 // GEANT 4 class header file
28 //
29 // History:
30 // 17 August 2004 P.Gumplinger and T.MacPhail
31 // samples Michel spectrum including 1st order
32 // radiative corrections
33 // Reference: Florian Scheck "Muon Physics", in Physics Reports
34 // (Review Section of Physics Letters) 44, No. 4 (1978)
35 // 187-248. North-Holland Publishing Company, Amsterdam
36 // at page 210 cc.
37 //
38 // W.E. Fisher and F. Scheck, Nucl. Phys. B83 (1974) 25.
39 //
40 // ------------------------------------------------------------
41 #ifndef G4MuonDecayChannelWithSpin_hh
42 #define G4MuonDecayChannelWithSpin_hh 1
43 
45 
46 #include "globals.hh"
47 #include "G4ThreeVector.hh"
48 #include "G4MuonDecayChannel.hh"
49 
51 {
52  // Class Decription
53  // This class describes muon decay kinemtics.
54  // This version assumes V-A coupling with 1st order radiative correctons,
55  // the standard model Michel parameter values, but
56  // gives incorrect energy spectrum for neutrinos
57 
58 public: // With Description
59 
60  //Constructors
61  G4MuonDecayChannelWithSpin(const G4String& theParentName,
62  G4double theBR);
63  // Destructor
65 
66 protected:
67  // Copy constructor and assignment operator
70 
71 private:
73 
74 public: // With Description
75 
77 
78 private:
79 // Radiative Correction Factors
80 
81  G4double F_c(G4double x, G4double x0 , G4double omega);
82  G4double F_theta(G4double x, G4double x0 , G4double omega);
83  G4double R_c(G4double x , G4double omega);
84 
85 };
86 
87 inline G4double G4MuonDecayChannelWithSpin::F_c(G4double x, G4double x0 , G4double omega)
88 {
89 
90  G4double f_c;
91 
92  f_c = (5.+17.*x-34.*x*x)*(omega+std::log(x))-22.*x+34.*x*x;
93  f_c = (1.-x)/(3.*x*x)*f_c;
94  f_c = (6.-4.*x)*R_c(x,omega)+(6.-6.*x)*std::log(x) + f_c;
95  f_c = (CLHEP::fine_structure_const/CLHEP::twopi) * (x*x-x0*x0) * f_c;
96 
97  return f_c;
98 }
99 
100 inline G4double G4MuonDecayChannelWithSpin::F_theta(G4double x, G4double x0,G4double omega)
101 {
102  G4double f_theta;
103 
104  f_theta = (1.+x+34*x*x)*(omega+std::log(x))+3.-7.*x-32.*x*x;
105  f_theta = f_theta + ((4.*(1.-x)*(1.-x))/x)*std::log(1.-x);
106  f_theta = (1.-x)/(3.*x*x) * f_theta;
107  f_theta = (2.-4.*x)*R_c(x,omega)+(2.-6.*x)*std::log(x)-f_theta;
108  f_theta = (CLHEP::fine_structure_const/CLHEP::twopi) * (x*x-x0*x0) * f_theta;
109 
110  return f_theta;
111 }
112 
113 #endif
tuple x
Definition: test.py:50
virtual G4DecayProducts * DecayIt(G4double)
G4MuonDecayChannelWithSpin & operator=(const G4MuonDecayChannelWithSpin &)
double G4double
Definition: G4Types.hh:76
static constexpr double fine_structure_const
static constexpr double twopi
Definition: SystemOfUnits.h:55