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>> 26 // $Id: G4eeTo3PiModel.cc 91869 2015-08-07 15:21:02Z gcosmo $
26 // 27 //
27 // ------------------------------------------- 28 // -------------------------------------------------------------------
28 // 29 //
29 // GEANT4 Class header file 30 // GEANT4 Class header file
30 // 31 //
31 // 32 //
32 // File name: G4eeTo3PiModel 33 // File name: G4eeTo3PiModel
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 "G4eeTo3PiModel.hh" 49 #include "G4eeTo3PiModel.hh"
49 #include "Randomize.hh" 50 #include "Randomize.hh"
50 #include "G4SystemOfUnits.hh" 51 #include "G4SystemOfUnits.hh"
51 #include "G4PionPlus.hh" 52 #include "G4PionPlus.hh"
52 #include "G4PionMinus.hh" 53 #include "G4PionMinus.hh"
53 #include "G4PionZero.hh" 54 #include "G4PionZero.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 #include "G4RandomDirection.hh" 59 #include "G4RandomDirection.hh"
59 #include <complex> 60 #include <complex>
60 61
61 //....oooOO0OOooo........oooOO0OOooo........oo 62 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
62 63
63 using namespace std; 64 using namespace std;
64 65
65 G4eeTo3PiModel::G4eeTo3PiModel(G4eeCrossSectio 66 G4eeTo3PiModel::G4eeTo3PiModel(G4eeCrossSections* cr,
66 G4double maxkinEnergy, 67 G4double maxkinEnergy,
67 G4double binWidth) 68 G4double binWidth)
68 : G4Vee2hadrons(cr, 69 : G4Vee2hadrons(cr,
69 0.41612*GeV, //threshold 70 0.41612*GeV, //threshold
70 maxkinEnergy, 71 maxkinEnergy,
71 binWidth) 72 binWidth)
72 { 73 {
73 G4cout << "####G4eeTo3PiModel####" << G4endl 74 G4cout << "####G4eeTo3PiModel####" << G4endl;
74 75
75 massPi = G4PionPlus::PionPlus()->GetPDGMass 76 massPi = G4PionPlus::PionPlus()->GetPDGMass();
76 massPi0 = G4PionZero::PionZero()->GetPDGMass 77 massPi0 = G4PionZero::PionZero()->GetPDGMass();
77 massOm = 782.62*MeV; 78 massOm = 782.62*MeV;
78 massPhi = 1019.46*MeV; 79 massPhi = 1019.46*MeV;
79 gmax = 3.0e-8; 80 gmax = 3.0e-8;
80 } 81 }
81 82
82 //....oooOO0OOooo........oooOO0OOooo........oo 83 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
83 84
84 G4eeTo3PiModel::~G4eeTo3PiModel() 85 G4eeTo3PiModel::~G4eeTo3PiModel()
85 {} 86 {}
86 87
87 //....oooOO0OOooo........oooOO0OOooo........oo 88 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
88 89
89 G4double G4eeTo3PiModel::PeakEnergy() const 90 G4double G4eeTo3PiModel::PeakEnergy() const
90 { 91 {
91 G4double e = massOm; 92 G4double e = massOm;
92 if(HighEnergy() > massPhi) { e = massPhi; } 93 if(HighEnergy() > massPhi) { e = massPhi; }
93 return e; 94 return e;
94 } 95 }
95 96
96 //....oooOO0OOooo........oooOO0OOooo........oo 97 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
97 98
98 G4double G4eeTo3PiModel::ComputeCrossSection(G 99 G4double G4eeTo3PiModel::ComputeCrossSection(G4double e) const
99 { 100 {
100 return cross->CrossSection3pi(e); 101 return cross->CrossSection3pi(e);
101 } 102 }
102 103
103 //....oooOO0OOooo........oooOO0OOooo........oo 104 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
104 105
105 void G4eeTo3PiModel::SampleSecondaries(std::ve 106 void G4eeTo3PiModel::SampleSecondaries(std::vector<G4DynamicParticle*>* newp,
106 G4double e, const G4ThreeVector& directi 107 G4double e, const G4ThreeVector& direction)
107 { 108 {
108 109
109 G4double x0 = massPi0/e; 110 G4double x0 = massPi0/e;
110 G4double x1 = massPi/e; 111 G4double x1 = massPi/e;
111 112
112 G4LorentzVector w0(0.,0.,0.,0.), w1(0.,0.,0. 113 G4LorentzVector w0(0.,0.,0.,0.), w1(0.,0.,0.,0.), w2(0.,0.,0.,0.);
113 G4ThreeVector dir0, dir1; 114 G4ThreeVector dir0, dir1;
114 G4double e0, p0, e2, p, gg, m01, m02, m12; 115 G4double e0, p0, e2, p, gg, m01, m02, m12;
115 116
116 // max pi0 energy 117 // max pi0 energy
117 G4double edel = 0.5*e*(1.0 + x0*x0 - 4.0*x1 118 G4double edel = 0.5*e*(1.0 + x0*x0 - 4.0*x1*x1) - massPi0;
118 119
119 const G4int nmax = 200; 120 const G4int nmax = 200;
120 G4int nn = 0; 121 G4int nn = 0;
121 do { 122 do {
122 ++nn; 123 ++nn;
123 // pi0 sample 124 // pi0 sample
124 e0 = edel*G4UniformRand() + massPi0; 125 e0 = edel*G4UniformRand() + massPi0;
125 p0 = sqrt(e0*e0 - massPi0*massPi0); 126 p0 = sqrt(e0*e0 - massPi0*massPi0);
126 dir0 = G4RandomDirection(); 127 dir0 = G4RandomDirection();
127 w0 = G4LorentzVector(p0*dir0.x(),p0*dir0.y 128 w0 = G4LorentzVector(p0*dir0.x(),p0*dir0.y(),p0*dir0.z(),e0);
128 129
129 // pi+pi- pair 130 // pi+pi- pair
130 w1 = G4LorentzVector(-p0*dir0.x(),-p0*dir0 131 w1 = G4LorentzVector(-p0*dir0.x(),-p0*dir0.y(),-p0*dir0.z(),e-e0);
131 G4ThreeVector bst = w1.boostVector(); 132 G4ThreeVector bst = w1.boostVector();
132 e2 = 0.25*w1.m2(); 133 e2 = 0.25*w1.m2();
133 134
134 // pi+ 135 // pi+
135 p = sqrt(e2 - massPi*massPi); 136 p = sqrt(e2 - massPi*massPi);
136 dir1 = G4RandomDirection(); 137 dir1 = G4RandomDirection();
137 w2 = G4LorentzVector(p*dir1.x(),p*dir1.y() 138 w2 = G4LorentzVector(p*dir1.x(),p*dir1.y(),p*dir1.z(),sqrt(e2));
138 // pi- 139 // pi-
139 w1.set(-w2.px(), -w2.py(), -w2.pz(), w2.e( 140 w1.set(-w2.px(), -w2.py(), -w2.pz(), w2.e());
140 141
141 w1.boost(bst); 142 w1.boost(bst);
142 w2.boost(bst); 143 w2.boost(bst);
143 144
144 G4double px2 = w2.x(); 145 G4double px2 = w2.x();
145 G4double py2 = w2.y(); 146 G4double py2 = w2.y();
146 G4double pz2 = w2.z(); 147 G4double pz2 = w2.z();
147 148
148 G4double px1 = w1.x(); 149 G4double px1 = w1.x();
149 G4double py1 = w1.y(); 150 G4double py1 = w1.y();
150 G4double pz1 = w1.z(); 151 G4double pz1 = w1.z();
151 152
152 m01 = w0*w1; 153 m01 = w0*w1;
153 m02 = w0*w2; 154 m02 = w0*w2;
154 m12 = w1*w2; 155 m12 = w1*w2;
155 156
156 G4double px = py1*pz2 - py2*pz1; 157 G4double px = py1*pz2 - py2*pz1;
157 G4double py = pz1*px2 - pz2*px1; 158 G4double py = pz1*px2 - pz2*px1;
158 G4double pz = px1*py2 - px2*py1; 159 G4double pz = px1*py2 - px2*py1;
159 160
160 gg = (px*px + py*py + pz*pz)* 161 gg = (px*px + py*py + pz*pz)*
161 norm( 1.0/cross->DpRho(m01) + 1.0/cross 162 norm( 1.0/cross->DpRho(m01) + 1.0/cross->DpRho(m02)
162 + 1.0/cross->DpRho(m12) ); 163 + 1.0/cross->DpRho(m12) );
163 164
164 if(gg > gmax) { 165 if(gg > gmax) {
165 G4cout << "G4eeTo3PiModel::SampleSeconda 166 G4cout << "G4eeTo3PiModel::SampleSecondaries WARNING matrix element g= "
166 << gg << " > " << gmax << " (majoranta) 167 << gg << " > " << gmax << " (majoranta)" << G4endl;
167 gmax = gg; 168 gmax = gg;
168 } 169 }
169 // Loop checking, 07-Aug-2015, Vladimir Iv 170 // Loop checking, 07-Aug-2015, Vladimir Ivanchenko
170 } while( gmax*G4UniformRand() > gg || nn < n 171 } while( gmax*G4UniformRand() > gg || nn < nmax);
171 172
172 w0.rotateUz(direction); 173 w0.rotateUz(direction);
173 w1.rotateUz(direction); 174 w1.rotateUz(direction);
174 w2.rotateUz(direction); 175 w2.rotateUz(direction);
175 176
176 // create G4DynamicParticle objects 177 // create G4DynamicParticle objects
177 G4DynamicParticle* dp0 = 178 G4DynamicParticle* dp0 =
178 new G4DynamicParticle(G4PionZero::PionZer 179 new G4DynamicParticle(G4PionZero::PionZero(), w0);
179 G4DynamicParticle* dp1 = 180 G4DynamicParticle* dp1 =
180 new G4DynamicParticle(G4PionPlus::PionPlu 181 new G4DynamicParticle(G4PionPlus::PionPlus(), w1);
181 G4DynamicParticle* dp2 = 182 G4DynamicParticle* dp2 =
182 new G4DynamicParticle(G4PionMinus::PionMi 183 new G4DynamicParticle(G4PionMinus::PionMinus(), w2);
183 newp->push_back(dp0); 184 newp->push_back(dp0);
184 newp->push_back(dp1); 185 newp->push_back(dp1);
185 newp->push_back(dp2); 186 newp->push_back(dp2);
186 } 187 }
187 188
188 //....oooOO0OOooo........oooOO0OOooo........oo 189 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
189 190
190 191