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25 // 25 //
>> 26 // $Id: G4eeTo3PiModel.cc,v 1.3 2009/11/11 17:13:47 vnivanch Exp $
>> 27 // GEANT4 tag $Name: geant4-09-03 $
26 // 28 //
27 // ------------------------------------------- 29 // -------------------------------------------------------------------
28 // 30 //
29 // GEANT4 Class header file 31 // GEANT4 Class header file
30 // 32 //
31 // 33 //
32 // File name: G4eeTo3PiModel 34 // File name: G4eeTo3PiModel
33 // 35 //
34 // Author: Vladimir Ivanchenko 36 // Author: Vladimir Ivanchenko
35 // 37 //
36 // Creation date: 25.10.2003 38 // Creation date: 25.10.2003
37 // 39 //
38 // Modifications: 40 // Modifications:
39 // 41 //
40 // 42 //
41 // ------------------------------------------- 43 // -------------------------------------------------------------------
42 // 44 //
43 45
44 46
45 //....oooOO0OOooo........oooOO0OOooo........oo 47 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
46 //....oooOO0OOooo........oooOO0OOooo........oo 48 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
47 49
48 #include "G4eeTo3PiModel.hh" 50 #include "G4eeTo3PiModel.hh"
49 #include "Randomize.hh" 51 #include "Randomize.hh"
50 #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 cross(cr)
67 G4double binWidth) <<
68 : G4Vee2hadrons(cr, <<
69 0.41612*GeV, //threshold <<
70 maxkinEnergy, <<
71 binWidth) <<
72 { 68 {
73 G4cout << "####G4eeTo3PiModel####" << G4endl <<
74 <<
75 massPi = G4PionPlus::PionPlus()->GetPDGMass 69 massPi = G4PionPlus::PionPlus()->GetPDGMass();
76 massPi0 = G4PionZero::PionZero()->GetPDGMass 70 massPi0 = G4PionZero::PionZero()->GetPDGMass();
77 massOm = 782.62*MeV; 71 massOm = 782.62*MeV;
78 massPhi = 1019.46*MeV; 72 massPhi = 1019.46*MeV;
79 gmax = 3.0e-8; << 73 gcash = 0.0;
>> 74 gmax = 1.0;
80 } 75 }
81 76
82 //....oooOO0OOooo........oooOO0OOooo........oo 77 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
83 78
84 G4eeTo3PiModel::~G4eeTo3PiModel() 79 G4eeTo3PiModel::~G4eeTo3PiModel()
85 {} << 80 {
>> 81 G4cout << "### G4eeTo3PiModel::~G4eeTo3PiModel: gmax= "
>> 82 << gmax << " gcash= " << gcash << G4endl;
>> 83 }
>> 84
>> 85 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 86
>> 87 G4double G4eeTo3PiModel::ThresholdEnergy() const
>> 88 {
>> 89 return std::max(LowEnergy(),2.0*massPi + massPi0);
>> 90 }
86 91
87 //....oooOO0OOooo........oooOO0OOooo........oo 92 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
88 93
89 G4double G4eeTo3PiModel::PeakEnergy() const 94 G4double G4eeTo3PiModel::PeakEnergy() const
90 { 95 {
91 G4double e = massOm; 96 G4double e = massOm;
92 if(HighEnergy() > massPhi) { e = massPhi; } << 97 if(HighEnergy() > massPhi) e = massPhi;
93 return e; 98 return e;
94 } 99 }
95 100
96 //....oooOO0OOooo........oooOO0OOooo........oo 101 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
97 102
98 G4double G4eeTo3PiModel::ComputeCrossSection(G 103 G4double G4eeTo3PiModel::ComputeCrossSection(G4double e) const
99 { 104 {
100 return cross->CrossSection3pi(e); << 105 G4double ee = std::min(HighEnergy(),e);
>> 106 return cross->CrossSection3pi(ee);
>> 107 }
>> 108
>> 109 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 110
>> 111 G4PhysicsVector* G4eeTo3PiModel::PhysicsVector(G4double emin,
>> 112 G4double emax) const
>> 113 {
>> 114 G4double tmin = std::max(emin, ThresholdEnergy());
>> 115 G4double tmax = std::max(tmin, emax);
>> 116 G4int nbins = (G4int)((tmax - tmin)/(1.*MeV));
>> 117 G4PhysicsVector* v = new G4PhysicsLinearVector(emin,emax,nbins);
>> 118 v->SetSpline(true);
>> 119 return v;
101 } 120 }
102 121
103 //....oooOO0OOooo........oooOO0OOooo........oo 122 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
104 123
105 void G4eeTo3PiModel::SampleSecondaries(std::ve 124 void G4eeTo3PiModel::SampleSecondaries(std::vector<G4DynamicParticle*>* newp,
106 G4double e, const G4ThreeVector& directi 125 G4double e, const G4ThreeVector& direction)
107 { 126 {
>> 127 if(e < ThresholdEnergy()) return;
108 128
109 G4double x0 = massPi0/e; 129 G4double x0 = massPi0/e;
110 G4double x1 = massPi/e; 130 G4double x1 = massPi/e;
111 131
112 G4LorentzVector w0(0.,0.,0.,0.), w1(0.,0.,0. << 132 G4LorentzVector w0, w1, w2;
113 G4ThreeVector dir0, dir1; 133 G4ThreeVector dir0, dir1;
114 G4double e0, p0, e2, p, gg, m01, m02, m12; << 134 G4double e0, p0, e2, p, g, m01, m02, m12;
115 135
116 // max pi0 energy 136 // max pi0 energy
117 G4double edel = 0.5*e*(1.0 + x0*x0 - 4.0*x1 137 G4double edel = 0.5*e*(1.0 + x0*x0 - 4.0*x1*x1) - massPi0;
118 138
119 const G4int nmax = 200; <<
120 G4int nn = 0; <<
121 do { 139 do {
122 ++nn; <<
123 // pi0 sample 140 // pi0 sample
124 e0 = edel*G4UniformRand() + massPi0; 141 e0 = edel*G4UniformRand() + massPi0;
125 p0 = sqrt(e0*e0 - massPi0*massPi0); << 142 p0 = sqrt(e0 - massPi0*massPi0);
126 dir0 = G4RandomDirection(); 143 dir0 = G4RandomDirection();
127 w0 = G4LorentzVector(p0*dir0.x(),p0*dir0.y 144 w0 = G4LorentzVector(p0*dir0.x(),p0*dir0.y(),p0*dir0.z(),e0);
128 145
129 // pi+pi- pair 146 // pi+pi- pair
130 w1 = G4LorentzVector(-p0*dir0.x(),-p0*dir0 147 w1 = G4LorentzVector(-p0*dir0.x(),-p0*dir0.y(),-p0*dir0.z(),e-e0);
131 G4ThreeVector bst = w1.boostVector(); 148 G4ThreeVector bst = w1.boostVector();
132 e2 = 0.25*w1.m2(); 149 e2 = 0.25*w1.m2();
133 150
134 // pi+ 151 // pi+
135 p = sqrt(e2 - massPi*massPi); 152 p = sqrt(e2 - massPi*massPi);
136 dir1 = G4RandomDirection(); 153 dir1 = G4RandomDirection();
137 w2 = G4LorentzVector(p*dir1.x(),p*dir1.y() 154 w2 = G4LorentzVector(p*dir1.x(),p*dir1.y(),p*dir1.z(),sqrt(e2));
138 // pi- <<
139 w1.set(-w2.px(), -w2.py(), -w2.pz(), w2.e( <<
140 <<
141 w1.boost(bst); <<
142 w2.boost(bst); 155 w2.boost(bst);
143 <<
144 G4double px2 = w2.x(); 156 G4double px2 = w2.x();
145 G4double py2 = w2.y(); 157 G4double py2 = w2.y();
146 G4double pz2 = w2.z(); 158 G4double pz2 = w2.z();
147 159
>> 160 // pi-
>> 161 w1 -= w2;
148 G4double px1 = w1.x(); 162 G4double px1 = w1.x();
149 G4double py1 = w1.y(); 163 G4double py1 = w1.y();
150 G4double pz1 = w1.z(); 164 G4double pz1 = w1.z();
151 165
152 m01 = w0*w1; 166 m01 = w0*w1;
153 m02 = w0*w2; 167 m02 = w0*w2;
154 m12 = w1*w2; 168 m12 = w1*w2;
155 169
156 G4double px = py1*pz2 - py2*pz1; 170 G4double px = py1*pz2 - py2*pz1;
157 G4double py = pz1*px2 - pz2*px1; 171 G4double py = pz1*px2 - pz2*px1;
158 G4double pz = px1*py2 - px2*py1; 172 G4double pz = px1*py2 - px2*py1;
159 173
160 gg = (px*px + py*py + pz*pz)* << 174 g = (px*px + py*py + pz*pz)*
161 norm( 1.0/cross->DpRho(m01) + 1.0/cross 175 norm( 1.0/cross->DpRho(m01) + 1.0/cross->DpRho(m02)
162 + 1.0/cross->DpRho(m12) ); 176 + 1.0/cross->DpRho(m12) );
163 << 177 if(g > gmax) {
164 if(gg > gmax) { <<
165 G4cout << "G4eeTo3PiModel::SampleSeconda 178 G4cout << "G4eeTo3PiModel::SampleSecondaries WARNING matrix element g= "
166 << gg << " > " << gmax << " (majoranta) << 179 << g << " > " << gmax << " (majoranta)" << G4endl;
167 gmax = gg; <<
168 } 180 }
169 // Loop checking, 07-Aug-2015, Vladimir Iv << 181 if(g > gcash) gcash = g;
170 } while( gmax*G4UniformRand() > gg || nn < n << 182
>> 183 } while( gmax*G4UniformRand() > g );
171 184
172 w0.rotateUz(direction); 185 w0.rotateUz(direction);
173 w1.rotateUz(direction); 186 w1.rotateUz(direction);
174 w2.rotateUz(direction); 187 w2.rotateUz(direction);
175 188
176 // create G4DynamicParticle objects 189 // create G4DynamicParticle objects
177 G4DynamicParticle* dp0 = 190 G4DynamicParticle* dp0 =
178 new G4DynamicParticle(G4PionZero::PionZer 191 new G4DynamicParticle(G4PionZero::PionZero(), w0);
179 G4DynamicParticle* dp1 = 192 G4DynamicParticle* dp1 =
180 new G4DynamicParticle(G4PionPlus::PionPlu 193 new G4DynamicParticle(G4PionPlus::PionPlus(), w1);
181 G4DynamicParticle* dp2 = 194 G4DynamicParticle* dp2 =
182 new G4DynamicParticle(G4PionMinus::PionMi 195 new G4DynamicParticle(G4PionMinus::PionMinus(), w2);
183 newp->push_back(dp0); 196 newp->push_back(dp0);
184 newp->push_back(dp1); 197 newp->push_back(dp1);
185 newp->push_back(dp2); 198 newp->push_back(dp2);
186 } 199 }
187 200
188 //....oooOO0OOooo........oooOO0OOooo........oo 201 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
189 202
190 203