| Geant4 Cross Reference |
1 //
2 // ********************************************************************
3 // * License and Disclaimer *
4 // * *
5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. *
10 // * *
11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitation of liability. *
17 // * *
18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Software license. *
24 // ********************************************************************
25 //
26 //
27 // PDG fits, 1998 Review of Particle Properties, European Phys. J. 3(1998), 1
28 // -------------------------------------------------------------------
29
30 #include "globals.hh"
31 #include "G4ios.hh"
32 #include "G4Pow.hh"
33 #include "G4SystemOfUnits.hh"
34 #include "G4XPDGTotal.hh"
35 #include "G4KineticTrack.hh"
36 #include "G4ParticleDefinition.hh"
37 #include "G4DataVector.hh"
38 #include "G4AntiProton.hh"
39 #include "G4AntiNeutron.hh"
40 #include "G4Proton.hh"
41 #include "G4Neutron.hh"
42 #include "G4PionPlus.hh"
43 #include "G4PionMinus.hh"
44 #include "G4Gamma.hh"
45 #include "G4KaonMinus.hh"
46 #include "G4KaonPlus.hh"
47
48 const G4double G4XPDGTotal::_lowLimit = 3. * GeV; // 2.99999 * GeV;
49 const G4double G4XPDGTotal::_highLimit = DBL_MAX;
50
51 // Parameters of the PDG total cross-section fit (Rev. Particle Properties, 1998)
52 // Columns are: lower and higher fit range, X, Y1, Y2
53 const G4int G4XPDGTotal::nFit = 5;
54 // p p
55 const G4double G4XPDGTotal::ppPDGFit[5] = { 3., 40000., 18.256, 60.19, 33.43 };
56 // n p
57 const G4double G4XPDGTotal::npPDGFit[5] = { 3., 40., 18.256, 61.14, 29.80 };
58 // pi p
59 const G4double G4XPDGTotal::pipPDGFit[5] = { 3., 40., 11.568, 27.55, 5.62 };
60 // K p
61 const G4double G4XPDGTotal::KpPDGFit[5] = { 3., 40., 10.376, 15.57, 13.19 };
62 // K n
63 const G4double G4XPDGTotal::KnPDGFit[5] = { 3., 40., 10.376, 14.29, 7.38 };
64 // gamma p
65 const G4double G4XPDGTotal::gammapPDGFit[5] = { 3., 300., 0.0577, 0.1171, 0. };
66 //gamma gamma
67 const G4double G4XPDGTotal::gammagammaPDGFit[5] = { 3., 300., 0.000156, 0.00032, 0. };
68
69
70 G4XPDGTotal::G4XPDGTotal()
71 {
72 std::pair<const G4ParticleDefinition *,const G4ParticleDefinition *> pp(G4Proton::ProtonDefinition(),
73 G4Proton::ProtonDefinition());
74 std::pair<const G4ParticleDefinition *,const G4ParticleDefinition *> pn(G4Proton::ProtonDefinition(),
75 G4Neutron::NeutronDefinition());
76 std::pair<const G4ParticleDefinition *,const G4ParticleDefinition *> piPlusp(G4PionPlus::PionPlusDefinition(),
77 G4Proton::ProtonDefinition());
78 std::pair<const G4ParticleDefinition *,const G4ParticleDefinition *> piMinusp(G4PionMinus::PionMinusDefinition(),
79 G4Proton::ProtonDefinition());
80 std::pair<const G4ParticleDefinition *,const G4ParticleDefinition *> KPlusp(G4KaonPlus::KaonPlusDefinition(),
81 G4Proton::ProtonDefinition());
82 std::pair<const G4ParticleDefinition *,const G4ParticleDefinition *> KPlusn(G4KaonPlus::KaonPlusDefinition(),
83 G4Neutron::NeutronDefinition());
84 std::pair<const G4ParticleDefinition *,const G4ParticleDefinition *> KMinusp(G4KaonMinus::KaonMinusDefinition(),
85 G4Proton::ProtonDefinition());
86 std::pair<const G4ParticleDefinition *,const G4ParticleDefinition *> KMinusn(G4KaonMinus::KaonMinusDefinition(),
87 G4Neutron::NeutronDefinition());
88 std::pair<const G4ParticleDefinition *,const G4ParticleDefinition *> gp(G4Gamma::GammaDefinition(),
89 G4Proton::ProtonDefinition());
90 std::pair<const G4ParticleDefinition *,const G4ParticleDefinition *> gg(G4Gamma::GammaDefinition(),
91 G4Gamma::GammaDefinition());
92 std::pair<const G4ParticleDefinition *,const G4ParticleDefinition *> nn(G4Neutron::NeutronDefinition(),
93 G4Neutron::NeutronDefinition());
94
95 std::vector<G4double> nnData;
96 std::vector<G4double> ppData;
97 std::vector<G4double> pnData;
98 std::vector<G4double> pipData;
99 std::vector<G4double> KpData;
100 std::vector<G4double> KnData;
101 std::vector<G4double> gpData;
102 std::vector<G4double> ggData;
103
104 G4int i;
105 for (i=0; i<2; i++)
106 {
107 nnData.push_back(ppPDGFit[i] * GeV);
108 ppData.push_back(ppPDGFit[i] * GeV);
109 pnData.push_back(npPDGFit[i] * GeV);
110 pipData.push_back(pipPDGFit[i] * GeV);
111 KpData.push_back(KpPDGFit[i] * GeV);
112 KnData.push_back(KnPDGFit[i] * GeV);
113 gpData.push_back(gammapPDGFit[i] * GeV);
114 ggData.push_back(gammagammaPDGFit[i] * GeV);
115 }
116 for (i=2; i<nFit; i++)
117 {
118 nnData.push_back(ppPDGFit[i]);
119 ppData.push_back(ppPDGFit[i]);
120 pnData.push_back(npPDGFit[i]);
121 pipData.push_back(pipPDGFit[i]);
122 KpData.push_back(KpPDGFit[i]);
123 KnData.push_back(KnPDGFit[i]);
124 gpData.push_back(gammapPDGFit[i]);
125 ggData.push_back(gammagammaPDGFit[i]);
126 }
127
128 xMap[pp] = std::move(ppData);
129 xMap[pn] = std::move(pnData);
130 xMap[piPlusp] = pipData;
131 xMap[piMinusp] = std::move(pipData);
132 xMap[KPlusp] = KpData;
133 xMap[KPlusn] = KnData;
134 xMap[KMinusp] = std::move(KpData);
135 xMap[KMinusn] = std::move(KnData);
136 xMap[gp] = std::move(gpData);
137 xMap[gg] = std::move(ggData);
138 xMap[nn] = std::move(nnData);
139 }
140
141
142 G4XPDGTotal::~G4XPDGTotal()
143 { }
144
145
146 G4bool G4XPDGTotal::operator==(const G4XPDGTotal &right) const
147 {
148 return (this == (G4XPDGTotal *) &right);
149 }
150
151
152 G4bool G4XPDGTotal::operator!=(const G4XPDGTotal &right) const
153 {
154 return (this != (G4XPDGTotal *) &right);
155 }
156
157
158 G4double G4XPDGTotal::CrossSection(const G4KineticTrack& trk1,
159 const G4KineticTrack& trk2) const
160 {
161 G4double sigma = 0.;
162
163 G4double sqrtS = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag();
164
165 const G4ParticleDefinition* def1 = trk1.GetDefinition();
166 const G4ParticleDefinition* def2 = trk2.GetDefinition();
167
168 G4double enc1 = def1->GetPDGEncoding();
169 G4double enc2 = def2->GetPDGEncoding();
170 G4double coeff = -1.;
171 if ( (enc1 < 0 && enc2 >0) || (enc2 < 0 && enc1 >0) ) coeff = 1.;
172
173 // Order the pair: first is the lower mass particle, second is the higher mass one
174 std::pair<const G4ParticleDefinition *,const G4ParticleDefinition *> trkPair(def1,def2);
175
176 if (def1->GetPDGMass() > def2->GetPDGMass())
177 trkPair = std::pair<const G4ParticleDefinition *,const G4ParticleDefinition *>(def2,def1);
178
179 std::vector<G4double> data;
180
181 if (xMap.find(trkPair) != xMap.end())
182 {
183
184 PairDoubleMap::const_iterator iter;
185 for (iter = xMap.begin(); iter != xMap.end(); ++iter)
186 {
187 std::pair<const G4ParticleDefinition *,const G4ParticleDefinition *> thePair = (*iter).first;
188 if (thePair == trkPair)
189 {
190 data = (*iter).second;
191
192 G4double eMinFit = data[0];
193 G4double eMaxFit = data[1];
194 G4double xFit = data[2];
195 G4double y1Fit = data[3];
196 G4double y2Fit = data[4];
197
198 // Total Cross-section fit, 1998 Review of Particle Properties, European Phys. J. 3(1998), 1
199
200 // Parameters from the PDG fit
201 static const G4double epsilon = 0.095;
202 static const G4double eta1 = -0.34;
203 static const G4double eta2 = -0.55;
204
205 if (sqrtS < eMinFit || sqrtS > eMaxFit)
206 {
207 G4cout << "WARNING! G4XPDGTotal::PDGTotal extrapolating cross section at "
208 << sqrtS / GeV
209 << " GeV outside the PDG fit range "
210 << eMinFit / GeV << " - " << eMaxFit / GeV << " GeV " << G4endl;
211 }
212
213 G4double S = (sqrtS * sqrtS) / (GeV*GeV);
214
215 sigma = ( (xFit * G4Pow::GetInstance()->powA(S,epsilon)) +
216 (y1Fit * G4Pow::GetInstance()->powA(S,eta1)) +
217 (coeff * y2Fit * G4Pow::GetInstance()->powA(S,eta2)) ) * millibarn;
218
219 if (sigma < 0.)
220 {
221 G4String name1 = def1->GetParticleName();
222 G4String name2 = def2->GetParticleName();
223 G4cout << "WARNING! G4XPDGTotal::PDGTotal "
224 << name1 << "-" << name2
225 << " total cross section: Ecm "
226 << sqrtS / GeV << " GeV, negative cross section "
227 << sigma / millibarn << " mb set to 0" << G4endl;
228 sigma = 0.;
229 }
230 }
231 }
232 }
233 return sigma;
234 }
235
236
237 G4String G4XPDGTotal::Name() const
238 {
239 G4String name = "PDGTotal ";
240 return name;
241 }
242
243
244 G4bool G4XPDGTotal::IsValid(G4double e) const
245 {
246 G4bool answer = InLimits(e,_lowLimit,_highLimit);
247
248 return answer;
249 }
250
251
252 G4double G4XPDGTotal::PDGTotal(G4double ,G4double ) const
253 {
254 return 0.;
255 }
256
257
258
259
260
261
262
263
264
265
266
267