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25 // 25 //
>> 26 // $Id: G4eeToTwoPiModel.cc 66241 2012-12-13 18:34:42Z gunter $
26 // 27 //
27 // ------------------------------------------- 28 // -------------------------------------------------------------------
28 // 29 //
29 // GEANT4 Class header file 30 // GEANT4 Class header file
30 // 31 //
31 // 32 //
32 // File name: G4eeToTwoPiModel 33 // File name: G4eeToTwoPiModel
33 // 34 //
34 // Author: Vladimir Ivanchenko 35 // Author: Vladimir Ivanchenko
35 // 36 //
36 // Creation date: 25.10.2003 37 // Creation date: 25.10.2003
37 // 38 //
38 // Modifications: 39 // Modifications:
39 // 40 //
40 // 41 //
41 // ------------------------------------------- 42 // -------------------------------------------------------------------
42 // 43 //
43 44
44 45
45 //....oooOO0OOooo........oooOO0OOooo........oo 46 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
46 //....oooOO0OOooo........oooOO0OOooo........oo 47 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
47 48
48 #include "G4eeToTwoPiModel.hh" 49 #include "G4eeToTwoPiModel.hh"
49 #include "Randomize.hh" 50 #include "Randomize.hh"
50 #include "G4PhysicalConstants.hh" 51 #include "G4PhysicalConstants.hh"
51 #include "G4SystemOfUnits.hh" 52 #include "G4SystemOfUnits.hh"
52 #include "G4PionPlus.hh" 53 #include "G4PionPlus.hh"
53 #include "G4PionMinus.hh" 54 #include "G4PionMinus.hh"
54 #include "G4DynamicParticle.hh" 55 #include "G4DynamicParticle.hh"
55 #include "G4PhysicsVector.hh" 56 #include "G4PhysicsVector.hh"
56 #include "G4PhysicsLinearVector.hh" 57 #include "G4PhysicsLinearVector.hh"
57 #include "G4eeCrossSections.hh" 58 #include "G4eeCrossSections.hh"
58 59
59 //....oooOO0OOooo........oooOO0OOooo........oo 60 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
60 61
61 using namespace std; 62 using namespace std;
62 63
63 G4eeToTwoPiModel::G4eeToTwoPiModel(G4eeCrossSe << 64 G4eeToTwoPiModel::G4eeToTwoPiModel(G4eeCrossSections* cr):
64 G4double maxkinEnergy, << 65 cross(cr)
65 G4double binWidth) <<
66 : G4Vee2hadrons(cr, <<
67 2.0*G4PionPlus::PionPlus()->GetPDGMass() <<
68 maxkinEnergy, <<
69 binWidth) <<
70 { 66 {
71 G4cout << "#####G4eeToTwoPiModel####" << G4e <<
72 <<
73 massPi = G4PionPlus::PionPlus()->GetPDGMass( 67 massPi = G4PionPlus::PionPlus()->GetPDGMass();
74 massRho = 775.5*CLHEP::MeV; << 68 massRho = 775.5*MeV;
75 } 69 }
76 70
77 //....oooOO0OOooo........oooOO0OOooo........oo 71 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
78 72
79 G4eeToTwoPiModel::~G4eeToTwoPiModel() 73 G4eeToTwoPiModel::~G4eeToTwoPiModel()
80 {} 74 {}
81 75
82 //....oooOO0OOooo........oooOO0OOooo........oo 76 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
83 77
>> 78 G4double G4eeToTwoPiModel::ThresholdEnergy() const
>> 79 {
>> 80 return 2.0*massPi;
>> 81 }
>> 82
>> 83 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 84
84 G4double G4eeToTwoPiModel::PeakEnergy() const 85 G4double G4eeToTwoPiModel::PeakEnergy() const
85 { 86 {
86 return massRho; 87 return massRho;
87 } 88 }
88 89
89 //....oooOO0OOooo........oooOO0OOooo........oo 90 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
90 91
91 G4double G4eeToTwoPiModel::ComputeCrossSection 92 G4double G4eeToTwoPiModel::ComputeCrossSection(G4double e) const
92 { 93 {
93 return cross->CrossSection2pi(e); << 94 G4double ee = std::min(HighEnergy(),e);
>> 95 return cross->CrossSection2pi(ee);
>> 96 }
>> 97
>> 98 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 99
>> 100 G4PhysicsVector* G4eeToTwoPiModel::PhysicsVector(G4double emin,
>> 101 G4double emax) const
>> 102 {
>> 103 G4double tmin = std::max(emin, 2.0*massPi);
>> 104 G4double tmax = std::max(tmin, emax);
>> 105 G4int nbins = (G4int)((tmax - tmin)/(5.*MeV));
>> 106 G4PhysicsVector* v = new G4PhysicsLinearVector(emin,emax,nbins);
>> 107 v->SetSpline(true);
>> 108 return v;
94 } 109 }
95 110
96 //....oooOO0OOooo........oooOO0OOooo........oo 111 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
97 112
98 void G4eeToTwoPiModel::SampleSecondaries(std:: 113 void G4eeToTwoPiModel::SampleSecondaries(std::vector<G4DynamicParticle*>* newp,
99 G4double e, const G4ThreeVector& directi 114 G4double e, const G4ThreeVector& direction)
100 { 115 {
101 116
102 G4double tkin = 0.5*e - massPi; 117 G4double tkin = 0.5*e - massPi;
103 if(tkin < 0.0) tkin = 0.0; 118 if(tkin < 0.0) tkin = 0.0;
104 G4double cost; 119 G4double cost;
105 do { 120 do {
106 cost = 2.0*G4UniformRand() - 1.0; 121 cost = 2.0*G4UniformRand() - 1.0;
107 // Loop checking, 07-Aug-2015, Vladimir Iv <<
108 } while( G4UniformRand() > 1.0 - cost*cost ) 122 } while( G4UniformRand() > 1.0 - cost*cost );
109 123
110 G4double sint = sqrt(1.0 - cost*cost); 124 G4double sint = sqrt(1.0 - cost*cost);
111 G4double phi = twopi * G4UniformRand(); 125 G4double phi = twopi * G4UniformRand();
112 126
113 G4ThreeVector dir(sint*cos(phi),sint*sin(phi 127 G4ThreeVector dir(sint*cos(phi),sint*sin(phi), cost);
114 dir.rotateUz(direction); 128 dir.rotateUz(direction);
115 129
116 // create G4DynamicParticle objects 130 // create G4DynamicParticle objects
117 G4DynamicParticle* pip = 131 G4DynamicParticle* pip =
118 new G4DynamicParticle(G4PionPlus::PionPlu 132 new G4DynamicParticle(G4PionPlus::PionPlus(),dir,tkin);
119 G4DynamicParticle* pin = 133 G4DynamicParticle* pin =
120 new G4DynamicParticle(G4PionMinus::PionMi 134 new G4DynamicParticle(G4PionMinus::PionMinus(),-dir,tkin);
121 newp->push_back(pip); 135 newp->push_back(pip);
122 newp->push_back(pin); 136 newp->push_back(pin);
123 } 137 }
124 138
125 //....oooOO0OOooo........oooOO0OOooo........oo 139 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
126 140
127 141