source: trunk/source/processes/electromagnetic/highenergy/src/G4eeCrossSections.cc@ 830

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25//
26// $Id: G4eeCrossSections.cc,v 1.6 2006/06/29 19:32:42 gunter Exp $
27// GEANT4 tag $Name: $
28//
29// -------------------------------------------------------------------
30//
31// GEANT4 Class header file
32//
33//
34// File name: G4eeCrossSections
35//
36// Author: Vladimir Ivanchenko
37//
38// Creation date: 25.10.2003
39//
40// Modifications:
41//
42//
43// -------------------------------------------------------------------
44//
45
46
47//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
48//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
49
50#include "G4eeCrossSections.hh"
51#include "G4PionPlus.hh"
52#include "G4PionMinus.hh"
53#include "G4PionZero.hh"
54#include "G4KaonPlus.hh"
55#include "G4KaonMinus.hh"
56#include "G4KaonZeroLong.hh"
57#include "G4PhysicsLinearVector.hh"
58
59#include <iostream>
60#include <fstream>
61
62//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
63
64using namespace std;
65
66G4eeCrossSections::G4eeCrossSections()
67{
68 Initialise();
69}
70
71//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
72
73G4eeCrossSections::~G4eeCrossSections()
74{}
75
76//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
77
78void G4eeCrossSections::Initialise()
79{
80 MsPi = G4PionPlus::PionPlus()->GetPDGMass();
81 MsPi0= G4PionZero::PionZero()->GetPDGMass();
82 MsEta= 547.30*MeV;
83 MsEtap=957.78*MeV;
84 MsKs = G4KaonZeroLong::KaonZeroLong()->GetPDGMass();
85 MsKc=G4KaonPlus::KaonPlus()->GetPDGMass();
86 MsRho= 770.0*MeV;
87 MsOm = 781.94*MeV;
88 MsF0 = 980.0*MeV;
89 MsA0 = 983.4*MeV;
90 MsPhi= 1019.413*MeV;
91 MsK892 = 891.66*MeV;
92 MsK0892 = 896.10*MeV;
93 GRho = 150.7*MeV;
94 GOm = 8.41*MeV;
95 GPhi = 4.43*MeV;
96 GK892 = 50.8*MeV;
97 GK0892 = 50.5*MeV;
98 PhRho = 0.0;
99 PhOm = 0.0;
100 PhPhi = 155.0*degree;
101 PhRhoPi = 186.0*degree;
102
103 BrRhoPiG = 4.5e-4;
104 BrRhoPi0G= 6.8e-4;
105 BrRhoEtaG= 2.4e-4;
106 BrRhoEe = 4.49e-5;
107 BrOm3Pi = 0.888;
108 BrOmPi0G= 0.085;
109 BrOmEtaG= 6.5e-4;
110 BrOm2Pi = 0.0221;
111 PhOm2Pi = 90.0;
112 BrOmEe = 7.07e-5;
113 BrPhi2Kc = 0.491;
114 BrPhiKsKl= 0.341;
115 BrPhi3Pi = 0.155;
116 BrPhiPi0G= 1.31e-3;
117 BrPhiEtaG= 1.26e-2;
118 BrPhi2Pi = 8.e-5;
119 PhPhi2Pi = -20.0*degree;
120 BrPhiEe = 2.99e-4;
121
122 MsRho3 = MsRho*MsRho*MsRho;
123 MsOm3 = MsOm*MsOm*MsOm;
124 MsPhi3 = MsPhi*MsPhi*MsPhi;
125
126 MeVnb = 3.8938e+11*nanobarn;
127 Alpha = 1.0/137.036;
128
129 AOmRho = 3.0;
130 ARhoPRho = 0.72;
131 cterm=0.;
132 mssig = 600.*MeV;
133 gsig = 500.*MeV;
134 brsigpipi = 1.;
135
136 msrho1450 = 1465.*MeV;
137 msrho1700 = 1700.*MeV;
138 grho1450 = 310.*MeV;
139 grho1700 = 240.*MeV;
140 arhoompi0 = 1.;
141 arho1450ompi0 = 1.;
142 arho1700ompi0 = 1.;
143 phrhoompi0 = 0.;
144 phrho1450ompi0 = pi;
145 phrho1700ompi0 = 0.;
146 aomrhopi0 = 1.;
147 phomrhopi0 = 0.;
148 arhopi0pi0g = 0.;
149 aompi0pi0g = 0.;
150 phrhopi0pi0g = 0.;
151 phompi0pi0g = 0.;
152 brrho1450ompi0 = 0.02;
153 brrho1450pipi = 0.50;
154 brrho1700ompi0 = 1.0;
155 brrho1700pipi = 0.02;
156 aphirhopi0 = 1.;
157 phphirhopi0 = pi;
158 arhosigg = 0.;
159 phrhosigg = 0.;
160 aomsigg = 0.;
161 phomsigg = 0.;
162
163 G4String w0, w1, w2;
164 ph3p = 0;
165
166 /*
167 G4double emin, emax;
168 G4int nbins;
169 const G4String fname = "wrhopi.wid";
170 ifstream fi(fname.c_str());
171 fi >> w0 >> nbins >> w1 >> emin >> w2 >> emax;
172 emin *= MeV;
173 emax *= MeV;
174 ph3p = new G4PhysicsLinearVector(emin,emax,nbins);
175 G4int nlines = nbins/5;
176 G4double s0, s1, s2, s3, s4;
177 for(G4int i=0; i<nlines; i++) {
178 fi >> s0 >> s1 >> s2 >> s3 >> s4;
179 ph3p->PutValue(5*i, s0);
180 ph3p->PutValue(5*i + 1, s1);
181 ph3p->PutValue(5*i + 2, s2);
182 ph3p->PutValue(5*i + 3, s3);
183 ph3p->PutValue(5*i + 4, s4);
184 }
185 fi.close();
186 */
187}
188
189//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
190
191G4double G4eeCrossSections::CrossSection2pi(G4double e)
192{
193
194 complex<G4double> xr(cos(PhRho),sin(PhRho));
195 complex<G4double> xo(cos(PhOm2Pi),sin(PhOm2Pi));
196 complex<G4double> xf(cos(PhPhi2Pi),sin(PhPhi2Pi));
197
198 G4double s = e*e;
199 complex<G4double> drho = DpRho(e);
200 complex<G4double> dom = DpOm(e);
201 complex<G4double> dphi = DpPhi(e);
202
203 complex<G4double> amp =
204 sqrt(Width2p(s,MsRho,GRho,1.0,MsPi)*MsRho3*BrRhoEe*GRho)*xr/drho
205 + sqrt(Width2p(s,MsOm,GOm,BrOm2Pi,MsPi)*MsOm3*BrOmEe*GOm)*xo/dom
206 + sqrt(Width2p(s,MsPhi,GPhi,BrPhi2Pi,MsPi)*MsPhi3*BrPhiEe*GPhi)*xf/dphi;
207
208 G4double cross = 12.0*pi*MeVnb*norm(amp)/(e*s);
209
210 return cross;
211}
212
213//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
214
215G4double G4eeCrossSections::Width2p(G4double s, G4double mres,
216 G4double g, G4double br, G4double m)
217{
218 G4double m2 = 4.0*m*m;
219 G4double s0 = mres*mres;
220 G4double f = (s - m2)/(s0 - m2);
221 if(f < 0.0) f = 0.0;
222 return g*br*sqrt(f)*f*s0/s;
223}
224
225//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
226
227G4double G4eeCrossSections::Width3p(G4double s, G4double mres,
228 G4double g, G4double br)
229{
230 G4double w = PhaseSpace3p(sqrt(s));
231 G4double w0= PhaseSpace3p(mres);
232 G4double x = g*br*w/w0;
233 return x;
234}
235
236//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
237
238G4double G4eeCrossSections::PhaseSpace3p(G4double e)
239{
240
241 // G4bool b;
242 // G4double x = ph3p->GetValue(e, b);
243 G4double x = 1.0;
244 G4double emev = e/MeV;
245 G4double y = 414.12/emev;
246 x *= pow(e/MsOm, 5.0) * pow(emev*0.1, 3.0)*(1.0 - y*y);
247 return x;
248}
249
250//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
251
252G4double G4eeCrossSections::WidthPg(G4double s, G4double mres,
253 G4double g, G4double br, G4double m)
254{
255 G4double m2 = m*m;
256 G4double s0 = mres*mres;
257 G4double f = (s - m2)*mres/((s0 - m2)*sqrt(s));
258 if(f < 0.0) f = 0.0;
259 return g*br*f*f*f;
260}
261
262//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
263
264G4double G4eeCrossSections::WidthRho(G4double e)
265{
266 G4double w = Width2p(e*e, MsRho, GRho, 1.0, MsPi);
267 return w;
268}
269
270//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
271
272G4double G4eeCrossSections::WidthOm(G4double e)
273{
274 G4double s = e*e;
275 G4double w = (Width3p(s, MsOm, GOm, BrOm3Pi) +
276 WidthPg(s, MsOm, GOm, BrOmPi0G, MsPi0) +
277 WidthPg(s, MsOm, GOm, BrOmEtaG, MsEta) +
278 Width2p(s, MsOm, GOm, BrOm2Pi, MsPi)) /
279 (BrOm3Pi+BrOmPi0G+BrOmEtaG+BrOm2Pi);
280 return w;
281}
282
283//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
284
285G4double G4eeCrossSections::WidthPhi(G4double e)
286{
287 G4double s = e*e;
288 G4double w = (Width3p(s, MsPhi, GPhi, BrPhi3Pi) +
289 WidthPg(s, MsPhi, GPhi, BrPhiPi0G, MsPi0) +
290 WidthPg(s, MsPhi, GPhi, BrPhiEtaG, MsEta) +
291 Width2p(s, MsPhi, GPhi, BrPhi2Kc, MsKc) +
292 Width2p(s, MsPhi, GPhi, BrPhiKsKl, MsKs)) /
293 (BrPhi3Pi+BrPhiPi0G+BrPhiEtaG+BrPhi2Kc+BrPhiKsKl);
294 return w;
295}
296
297//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
298
299complex<G4double> G4eeCrossSections::DpRho(G4double e)
300{
301 complex<G4double> d(MsRho*MsRho - e*e, -e*WidthRho(e));
302 return d;
303}
304
305//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
306
307complex<G4double> G4eeCrossSections::DpOm(G4double e)
308{
309 complex<G4double> d(MsOm*MsOm - e*e, -e*WidthOm(e));
310 return d;
311}
312
313//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
314
315complex<G4double> G4eeCrossSections::DpPhi(G4double e)
316{
317 complex<G4double> d(MsPhi*MsPhi - e*e, -e*WidthPhi(e));
318 return d;
319}
320
321//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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