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25 // 25 //
>> 26 // $Id: G4eeTo3PiModel.cc,v 1.1 2008/07/10 18:07:27 vnivanch Exp $
>> 27 // GEANT4 tag $Name: geant4-09-02-patch-04 $
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 {} <<
86 <<
87 //....oooOO0OOooo........oooOO0OOooo........oo <<
88 <<
89 G4double G4eeTo3PiModel::PeakEnergy() const <<
90 { 80 {
91 G4double e = massOm; << 81 G4cout << "### G4eeTo3PiModel::~G4eeTo3PiModel: gmax= "
92 if(HighEnergy() > massPhi) { e = massPhi; } << 82 << gmax << " gcash= " << gcash << G4endl;
93 return e; <<
94 } 83 }
95 84
96 //....oooOO0OOooo........oooOO0OOooo........oo 85 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
97 86
98 G4double G4eeTo3PiModel::ComputeCrossSection(G << 87 G4PhysicsVector* G4eeTo3PiModel::PhysicsVector(G4double emin,
>> 88 G4double emax) const
99 { 89 {
100 return cross->CrossSection3pi(e); << 90 G4double tmin = std::max(emin, ThresholdEnergy());
>> 91 G4double tmax = std::max(tmin, emax);
>> 92 G4int nbins = (G4int)((tmax - tmin)/(1.*MeV));
>> 93 G4PhysicsVector* v = new G4PhysicsLinearVector(emin,emax,nbins);
>> 94 v->SetSpline(true);
>> 95 return v;
101 } 96 }
102 97
103 //....oooOO0OOooo........oooOO0OOooo........oo 98 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
104 99
105 void G4eeTo3PiModel::SampleSecondaries(std::ve 100 void G4eeTo3PiModel::SampleSecondaries(std::vector<G4DynamicParticle*>* newp,
106 G4double e, const G4ThreeVector& directi 101 G4double e, const G4ThreeVector& direction)
107 { 102 {
>> 103 if(e < ThresholdEnergy()) return;
108 104
109 G4double x0 = massPi0/e; 105 G4double x0 = massPi0/e;
110 G4double x1 = massPi/e; 106 G4double x1 = massPi/e;
111 107
112 G4LorentzVector w0(0.,0.,0.,0.), w1(0.,0.,0. << 108 G4LorentzVector w0, w1, w2;
113 G4ThreeVector dir0, dir1; << 109 G4ThreeVector dir0, dir1, mom, mom1, mom2;
114 G4double e0, p0, e2, p, gg, m01, m02, m12; << 110 G4double e0, p0, e2, p, g, m01, m02, m12;
115 111
116 // max pi0 energy 112 // max pi0 energy
117 G4double edel = 0.5*e*(1.0 + x0*x0 - 4.0*x1 113 G4double edel = 0.5*e*(1.0 + x0*x0 - 4.0*x1*x1) - massPi0;
118 114
119 const G4int nmax = 200; <<
120 G4int nn = 0; <<
121 do { 115 do {
122 ++nn; <<
123 // pi0 sample 116 // pi0 sample
124 e0 = edel*G4UniformRand() + massPi0; 117 e0 = edel*G4UniformRand() + massPi0;
125 p0 = sqrt(e0*e0 - massPi0*massPi0); << 118 p0 = sqrt(e0 - massPi0*massPi0);
126 dir0 = G4RandomDirection(); 119 dir0 = G4RandomDirection();
127 w0 = G4LorentzVector(p0*dir0.x(),p0*dir0.y 120 w0 = G4LorentzVector(p0*dir0.x(),p0*dir0.y(),p0*dir0.z(),e0);
128 121
129 // pi+pi- pair 122 // pi+pi- pair
130 w1 = G4LorentzVector(-p0*dir0.x(),-p0*dir0 123 w1 = G4LorentzVector(-p0*dir0.x(),-p0*dir0.y(),-p0*dir0.z(),e-e0);
131 G4ThreeVector bst = w1.boostVector(); 124 G4ThreeVector bst = w1.boostVector();
132 e2 = 0.25*w1.m2(); 125 e2 = 0.25*w1.m2();
133 126
134 // pi+ 127 // pi+
135 p = sqrt(e2 - massPi*massPi); 128 p = sqrt(e2 - massPi*massPi);
136 dir1 = G4RandomDirection(); 129 dir1 = G4RandomDirection();
137 w2 = G4LorentzVector(p*dir1.x(),p*dir1.y() 130 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); 131 w2.boost(bst);
>> 132 mom2 = w2.vect();
143 133
144 G4double px2 = w2.x(); << 134 // pi-
145 G4double py2 = w2.y(); << 135 w1 -= w2;
146 G4double pz2 = w2.z(); << 136 mom1 = w2.vect();
147 <<
148 G4double px1 = w1.x(); <<
149 G4double py1 = w1.y(); <<
150 G4double pz1 = w1.z(); <<
151 137
152 m01 = w0*w1; 138 m01 = w0*w1;
153 m02 = w0*w2; 139 m02 = w0*w2;
154 m12 = w1*w2; 140 m12 = w1*w2;
155 141
156 G4double px = py1*pz2 - py2*pz1; << 142 mom = mom1*mom2;
157 G4double py = pz1*px2 - pz2*px1; << 143 g = mom.mag2()*norm( 1.0/cross->DpRho(m01) + 1.0/cross->DpRho(m02)
158 G4double pz = px1*py2 - px2*py1; << 144 + 1.0/cross->DpRho(m12) );
159 << 145 if(g > gmax) {
160 gg = (px*px + py*py + pz*pz)* <<
161 norm( 1.0/cross->DpRho(m01) + 1.0/cross <<
162 + 1.0/cross->DpRho(m12) ); <<
163 <<
164 if(gg > gmax) { <<
165 G4cout << "G4eeTo3PiModel::SampleSeconda 146 G4cout << "G4eeTo3PiModel::SampleSecondaries WARNING matrix element g= "
166 << gg << " > " << gmax << " (majoranta) << 147 << g << " > " << gmax << " (majoranta)" << G4endl;
167 gmax = gg; <<
168 } 148 }
169 // Loop checking, 07-Aug-2015, Vladimir Iv << 149 if(g > gcash) gcash = g;
170 } while( gmax*G4UniformRand() > gg || nn < n << 150
>> 151 } while( gmax*G4UniformRand() > g );
171 152
172 w0.rotateUz(direction); 153 w0.rotateUz(direction);
173 w1.rotateUz(direction); 154 w1.rotateUz(direction);
174 w2.rotateUz(direction); 155 w2.rotateUz(direction);
175 156
176 // create G4DynamicParticle objects 157 // create G4DynamicParticle objects
177 G4DynamicParticle* dp0 = 158 G4DynamicParticle* dp0 =
178 new G4DynamicParticle(G4PionZero::PionZer 159 new G4DynamicParticle(G4PionZero::PionZero(), w0);
179 G4DynamicParticle* dp1 = 160 G4DynamicParticle* dp1 =
180 new G4DynamicParticle(G4PionPlus::PionPlu 161 new G4DynamicParticle(G4PionPlus::PionPlus(), w1);
181 G4DynamicParticle* dp2 = 162 G4DynamicParticle* dp2 =
182 new G4DynamicParticle(G4PionMinus::PionMi 163 new G4DynamicParticle(G4PionMinus::PionMinus(), w2);
183 newp->push_back(dp0); 164 newp->push_back(dp0);
184 newp->push_back(dp1); 165 newp->push_back(dp1);
185 newp->push_back(dp2); 166 newp->push_back(dp2);
186 } 167 }
187 168
188 //....oooOO0OOooo........oooOO0OOooo........oo 169 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
189 170
190 171