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25 // 22 //
26 #include "globals.hh" 23 #include "globals.hh"
27 #include "G4ios.hh" 24 #include "G4ios.hh"
28 #include "G4PhysicalConstants.hh" <<
29 #include "G4XAnnihilationChannel.hh" 25 #include "G4XAnnihilationChannel.hh"
30 #include "G4KineticTrack.hh" 26 #include "G4KineticTrack.hh"
31 #include "G4ParticleDefinition.hh" 27 #include "G4ParticleDefinition.hh"
32 #include "G4ResonanceWidth.hh" 28 #include "G4ResonanceWidth.hh"
33 #include "G4ResonancePartialWidth.hh" 29 #include "G4ResonancePartialWidth.hh"
34 #include "G4PhysicsVector.hh" 30 #include "G4PhysicsVector.hh"
35 #include "G4PartialWidthTable.hh" 31 #include "G4PartialWidthTable.hh"
36 32
37 G4XAnnihilationChannel::G4XAnnihilationChannel 33 G4XAnnihilationChannel::G4XAnnihilationChannel(): resonance(0)
38 { << 34 { }
39 // As a first approximation the model is ass <<
40 // the entire energy range <<
41 lowLimit = 0.; <<
42 highLimit = DBL_MAX; <<
43 widthTable = 0; <<
44 partWidthTable = 0; <<
45 } <<
46 35
47 G4XAnnihilationChannel::G4XAnnihilationChannel 36 G4XAnnihilationChannel::G4XAnnihilationChannel(const G4ParticleDefinition* resDefinition,
48 const G4ResonanceWidth& resWi 37 const G4ResonanceWidth& resWidths,
49 const G4ResonancePartialWidth 38 const G4ResonancePartialWidth& resPartWidths,
50 const G4String& partWidthLabe 39 const G4String& partWidthLabel)
51 : resonance(resDefinition) 40 : resonance(resDefinition)
52 { 41 {
53 // Get the tabulated mass-dependent widths f 42 // Get the tabulated mass-dependent widths for the resonance
54 G4String resName = resonance->GetParticleNam 43 G4String resName = resonance->GetParticleName();
55 // cout << "HPW "<<resName<<endl; 44 // cout << "HPW "<<resName<<endl;
56 G4String shortName = theNames.ShortName(resN 45 G4String shortName = theNames.ShortName(resName);
57 // cout << "HPW "<<shortName<<endl; 46 // cout << "HPW "<<shortName<<endl;
58 // cout << "HPW "<<partWidthLabel<<endl; 47 // cout << "HPW "<<partWidthLabel<<endl;
59 48
60 widthTable = resWidths.MassDependentWidth(sh 49 widthTable = resWidths.MassDependentWidth(shortName);
61 partWidthTable = resPartWidths.MassDependent 50 partWidthTable = resPartWidths.MassDependentWidth(partWidthLabel);
62 51
63 // As a first approximation the model is ass 52 // As a first approximation the model is assumed to be valid over
64 // the entire energy range 53 // the entire energy range
65 lowLimit = 0.; 54 lowLimit = 0.;
66 highLimit = DBL_MAX; 55 highLimit = DBL_MAX;
67 } 56 }
68 57
69 58
70 G4XAnnihilationChannel::~G4XAnnihilationChanne 59 G4XAnnihilationChannel::~G4XAnnihilationChannel()
71 { 60 {
72 if (widthTable) delete widthTable; << 61 delete widthTable;
73 widthTable = 0; 62 widthTable = 0;
74 if (partWidthTable) delete partWidthTable; << 63 delete partWidthTable;
75 partWidthTable = 0; 64 partWidthTable = 0;
76 } 65 }
77 66
78 67
79 G4bool G4XAnnihilationChannel::operator==(cons 68 G4bool G4XAnnihilationChannel::operator==(const G4XAnnihilationChannel &right) const
80 { 69 {
81 return (this == (G4XAnnihilationChannel *) & 70 return (this == (G4XAnnihilationChannel *) &right);
82 } 71 }
83 72
84 73
85 G4bool G4XAnnihilationChannel::operator!=(cons 74 G4bool G4XAnnihilationChannel::operator!=(const G4XAnnihilationChannel &right) const
86 { 75 {
87 return (this != (G4XAnnihilationChannel *) & 76 return (this != (G4XAnnihilationChannel *) &right);
88 } 77 }
89 78
90 79
91 G4double G4XAnnihilationChannel::CrossSection( 80 G4double G4XAnnihilationChannel::CrossSection(const G4KineticTrack& trk1,
92 const G4KineticTrack& trk2) co 81 const G4KineticTrack& trk2) const
93 { 82 {
94 G4double sigma = 0.; 83 G4double sigma = 0.;
95 G4double eCM = (trk1.Get4Momentum() + trk2.G 84 G4double eCM = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag();
96 85
97 const G4ParticleDefinition* def1 = trk1.GetD << 86 G4ParticleDefinition* def1 = trk1.GetDefinition();
98 const G4ParticleDefinition* def2 = trk2.GetD << 87 G4ParticleDefinition* def2 = trk2.GetDefinition();
99 88
100 G4int J1 = def1->GetPDGiSpin(); 89 G4int J1 = def1->GetPDGiSpin();
101 G4int J2 = def2->GetPDGiSpin(); 90 G4int J2 = def2->GetPDGiSpin();
102 G4double m_1 = def1->GetPDGMass(); << 91 G4double m1 = def1->GetPDGMass();
103 G4double m_2 = def2->GetPDGMass(); << 92 G4double m2 = def2->GetPDGMass();
104 93
105 G4int JRes = resonance->GetPDGiSpin(); 94 G4int JRes = resonance->GetPDGiSpin();
106 G4double mRes = resonance->GetPDGMass(); 95 G4double mRes = resonance->GetPDGMass();
107 96
108 G4double branch = Branch(trk1,trk2); 97 G4double branch = Branch(trk1,trk2);
109 G4double width = VariableWidth(trk1,trk2); 98 G4double width = VariableWidth(trk1,trk2);
110 G4double cleb = NormalizedClebsch(trk1,trk2) 99 G4double cleb = NormalizedClebsch(trk1,trk2);
111 100
112 G4double S = eCM * eCM; << 101 G4double s = eCM * eCM;
113 if (S == 0.) throw G4HadronicException(__FIL << 102 if (s == 0.) throw G4HadronicException(__FILE__, __LINE__, "G4XAnnihilationChannel::CrossSection - eCM = 0");
114 103
115 G4double pCM = std::sqrt((S-(m_1+m_2)*(m_1+m << 104 G4double pCM = std::sqrt((s-(m1+m2)*(m1+m2))*(s-(m1-m2)*(m1-m2))/(4.*s));
116 105
117 sigma = ( (JRes + 1.) / ( (J1 + 1) * (J2 + 1 106 sigma = ( (JRes + 1.) / ( (J1 + 1) * (J2 + 1) )
118 * pi / (pCM * pCM) * branch * width * wi 107 * pi / (pCM * pCM) * branch * width * width /
119 ( (eCM - mRes) * (eCM - mRes) + width * 108 ( (eCM - mRes) * (eCM - mRes) + width * width / 4.0) * cleb * hbarc_squared);
120 109
121 // G4cout << "SS " << branch<<" "<<sigma<<" 110 // G4cout << "SS " << branch<<" "<<sigma<<" "
122 // << J1 <<" " 111 // << J1 <<" "
123 // <<J2<<" " 112 // <<J2<<" "
124 // <<m1<<" " 113 // <<m1<<" "
125 // <<m2<<" " 114 // <<m2<<" "
126 // <<JRes<<" " 115 // <<JRes<<" "
127 // <<mRes<<" " 116 // <<mRes<<" "
128 // <<wRes<<" " 117 // <<wRes<<" "
129 // <<width<<" " 118 // <<width<<" "
130 // <<cleb<<" " 119 // <<cleb<<" "
131 // <<G4endl; 120 // <<G4endl;
132 return sigma; 121 return sigma;
133 } 122 }
134 123
135 124
136 G4String G4XAnnihilationChannel::Name() const 125 G4String G4XAnnihilationChannel::Name() const
137 { 126 {
138 G4String name("XAnnihilationChannelCrossSect 127 G4String name("XAnnihilationChannelCrossSection");
139 return name; 128 return name;
140 } 129 }
141 130
142 131
143 132
144 G4bool G4XAnnihilationChannel::IsValid(G4doubl 133 G4bool G4XAnnihilationChannel::IsValid(G4double e) const
145 { 134 {
146 G4bool answer = InLimits(e,lowLimit,highLimi 135 G4bool answer = InLimits(e,lowLimit,highLimit);
147 136
148 return answer; 137 return answer;
149 } 138 }
150 139
151 140
152 G4double G4XAnnihilationChannel::Branch(const << 141 const G4double G4XAnnihilationChannel::Branch(const G4KineticTrack& trk1,
153 const << 142 const G4KineticTrack& trk2) const
154 { 143 {
155 G4double w=VariableWidth(trk1,trk2); 144 G4double w=VariableWidth(trk1,trk2);
156 if(w==0) return 0; 145 if(w==0) return 0;
157 return VariablePartialWidth(trk1,trk2) / Var 146 return VariablePartialWidth(trk1,trk2) / VariableWidth(trk1,trk2);
158 } 147 }
159 148
160 G4double G4XAnnihilationChannel::VariableWidth << 149 const G4double G4XAnnihilationChannel::VariableWidth(const G4KineticTrack& trk1,
161 << 150 const G4KineticTrack& trk2) const
162 { 151 {
163 // actual production width of resonance, dep 152 // actual production width of resonance, depending on available energy.
164 153
165 G4double width = resonance->GetPDGWidth(); 154 G4double width = resonance->GetPDGWidth();
166 G4bool dummy = false; 155 G4bool dummy = false;
167 G4double sqrtS = (trk1.Get4Momentum() + trk2 156 G4double sqrtS = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag();
168 if (widthTable != 0) 157 if (widthTable != 0)
169 { 158 {
170 width = widthTable->GetValue(sqrtS,dummy 159 width = widthTable->GetValue(sqrtS,dummy);
171 } 160 }
172 return width; 161 return width;
173 } 162 }
174 163
175 164
176 G4double G4XAnnihilationChannel::VariableParti << 165 const G4double G4XAnnihilationChannel::VariablePartialWidth(const G4KineticTrack& trk1,
177 << 166 const G4KineticTrack& trk2) const
178 { 167 {
179 // Calculate mass dependent partial width of 168 // Calculate mass dependent partial width of resonance,
180 // based on UrQMD tabulations 169 // based on UrQMD tabulations
181 170
182 G4double width(0); 171 G4double width(0);
183 172
184 if (partWidthTable != 0) 173 if (partWidthTable != 0)
185 { 174 {
186 G4double sqrtS = 0; 175 G4double sqrtS = 0;
187 G4bool dummy = false; 176 G4bool dummy = false;
188 sqrtS = (trk1.Get4Momentum() + trk2.Get4Mo 177 sqrtS = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag();
189 width = partWidthTable->GetValue(sqrtS,dum 178 width = partWidthTable->GetValue(sqrtS,dummy);
190 } 179 }
191 else 180 else
192 { 181 {
193 width = resonance->GetPDGWidth(); 182 width = resonance->GetPDGWidth();
194 } 183 }
195 return width; 184 return width;
196 } 185 }
197 186
198 187
199 G4double G4XAnnihilationChannel::NormalizedCle << 188 const G4double G4XAnnihilationChannel::NormalizedClebsch(const G4KineticTrack& trk1,
200 << 189 const G4KineticTrack& trk2) const
201 { 190 {
202 G4double cleb = 0.; 191 G4double cleb = 0.;
203 const G4ParticleDefinition* def1 = trk1.GetD << 192 G4ParticleDefinition* def1 = trk1.GetDefinition();
204 const G4ParticleDefinition* def2 = trk2.GetD << 193 G4ParticleDefinition* def2 = trk2.GetDefinition();
205 194
206 G4int iso31 = def1->GetPDGiIsospin3(); 195 G4int iso31 = def1->GetPDGiIsospin3();
207 G4int iso32 = def2->GetPDGiIsospin3(); 196 G4int iso32 = def2->GetPDGiIsospin3();
208 G4int iso3 = iso31 + iso32; 197 G4int iso3 = iso31 + iso32;
209 G4int iso1 = def1->GetPDGiIsospin(); 198 G4int iso1 = def1->GetPDGiIsospin();
210 G4int iso2 = def2->GetPDGiIsospin(); 199 G4int iso2 = def2->GetPDGiIsospin();
211 200
212 G4int isoRes = resonance->GetPDGiIsospin(); 201 G4int isoRes = resonance->GetPDGiIsospin();
213 202
214 if (isoRes < iso3) return 0.; 203 if (isoRes < iso3) return 0.;
215 if ((iso1*iso2) == 0) return 1.; 204 if ((iso1*iso2) == 0) return 1.;
216 205
217 cleb = clebsch.NormalizedClebschGordan(isoRe 206 cleb = clebsch.NormalizedClebschGordan(isoRes,iso3,iso1,iso2,iso31,iso32);
218 207
219 // Special case: particle-antiparticle, char 208 // Special case: particle-antiparticle, charge-conjugated states have the same weight
220 G4String type1 = def1->GetParticleType(); 209 G4String type1 = def1->GetParticleType();
221 G4String type2 = def2->GetParticleType(); 210 G4String type2 = def2->GetParticleType();
222 G4int anti = def1->GetPDGEncoding() * def2-> 211 G4int anti = def1->GetPDGEncoding() * def2->GetPDGEncoding();
223 G4int strangeness = resonance->GetQuarkConte 212 G4int strangeness = resonance->GetQuarkContent(3) + resonance->GetAntiQuarkContent(3);
224 if ( ((type1 == "baryon" && type2 == "baryon 213 if ( ((type1 == "baryon" && type2 == "baryon") ||(type1 == "meson" && type2 == "meson")) &&
225 anti < 0 && strangeness == 0) 214 anti < 0 && strangeness == 0)
226 { 215 {
227 if (def1->GetPDGEncoding() != -(def2->Ge 216 if (def1->GetPDGEncoding() != -(def2->GetPDGEncoding())) cleb = 0.5 * cleb;
228 } 217 }
229 218
230 return cleb; 219 return cleb;
231 } 220 }
232 221
233 222
234 223
235 224
236 225
237 226