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25 //
26 //
27 // -------------------------------------------------------------------
28 //
29 // GEANT4 Class header file
30 //
31 //
32 // File name: G4eeToTwoPiModel
33 //
34 // Author: Vladimir Ivanchenko
35 //
36 // Creation date: 25.10.2003
37 //
38 // Modifications:
39 //
40 //
41 // -------------------------------------------------------------------
42 //
43
44
45 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
46 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
47
48 #include "G4eeToTwoPiModel.hh"
49 #include "Randomize.hh"
50 #include "G4PhysicalConstants.hh"
51 #include "G4SystemOfUnits.hh"
52 #include "G4PionPlus.hh"
53 #include "G4PionMinus.hh"
54 #include "G4DynamicParticle.hh"
55 #include "G4PhysicsVector.hh"
56 #include "G4PhysicsLinearVector.hh"
57 #include "G4eeCrossSections.hh"
58
59 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
60
61 using namespace std;
62
63 G4eeToTwoPiModel::G4eeToTwoPiModel(G4eeCrossSections* cr,
64 G4double maxkinEnergy,
65 G4double binWidth)
66 : G4Vee2hadrons(cr,
67 2.0*G4PionPlus::PionPlus()->GetPDGMass(),
68 maxkinEnergy,
69 binWidth)
70 {
71 G4cout << "#####G4eeToTwoPiModel####" << G4endl;
72
73 massPi = G4PionPlus::PionPlus()->GetPDGMass();
74 massRho = 775.5*CLHEP::MeV;
75 }
76
77 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
78
79 G4eeToTwoPiModel::~G4eeToTwoPiModel()
80 {}
81
82 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
83
84 G4double G4eeToTwoPiModel::PeakEnergy() const
85 {
86 return massRho;
87 }
88
89 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
90
91 G4double G4eeToTwoPiModel::ComputeCrossSection(G4double e) const
92 {
93 return cross->CrossSection2pi(e);
94 }
95
96 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
97
98 void G4eeToTwoPiModel::SampleSecondaries(std::vector<G4DynamicParticle*>* newp,
99 G4double e, const G4ThreeVector& direction)
100 {
101
102 G4double tkin = 0.5*e - massPi;
103 if(tkin < 0.0) tkin = 0.0;
104 G4double cost;
105 do {
106 cost = 2.0*G4UniformRand() - 1.0;
107 // Loop checking, 07-Aug-2015, Vladimir Ivanchenko
108 } while( G4UniformRand() > 1.0 - cost*cost );
109
110 G4double sint = sqrt(1.0 - cost*cost);
111 G4double phi = twopi * G4UniformRand();
112
113 G4ThreeVector dir(sint*cos(phi),sint*sin(phi), cost);
114 dir.rotateUz(direction);
115
116 // create G4DynamicParticle objects
117 G4DynamicParticle* pip =
118 new G4DynamicParticle(G4PionPlus::PionPlus(),dir,tkin);
119 G4DynamicParticle* pin =
120 new G4DynamicParticle(G4PionMinus::PionMinus(),-dir,tkin);
121 newp->push_back(pip);
122 newp->push_back(pin);
123 }
124
125 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
126
127