source: trunk/source/processes/electromagnetic/highenergy/src/G4eeCrossSections.cc@ 1006

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25//
26// $Id: G4eeCrossSections.cc,v 1.7 2008/07/10 18:06:39 vnivanch Exp $
27// GEANT4 tag $Name: geant4-09-02-ref-02 $
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// 10.07.2008 Updated for PDG Jour. Physics, G33, 1 (2006)
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 "G4Eta.hh"
55#include "G4KaonPlus.hh"
56#include "G4KaonMinus.hh"
57#include "G4KaonZeroLong.hh"
58#include "G4PhysicsLinearVector.hh"
59
60#include <iostream>
61#include <fstream>
62
63//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
64
65using namespace std;
66
67G4eeCrossSections::G4eeCrossSections()
68{
69 Initialise();
70}
71
72//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
73
74G4eeCrossSections::~G4eeCrossSections()
75{}
76
77//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
78
79void G4eeCrossSections::Initialise()
80{
81 MsPi = G4PionPlus::PionPlus()->GetPDGMass();
82 MsPi0= G4PionZero::PionZero()->GetPDGMass();
83 MsEta= G4Eta::Eta()->GetPDGMass();
84 MsEtap=957.78*MeV;
85 MsKs = G4KaonZeroLong::KaonZeroLong()->GetPDGMass();
86 MsKc = G4KaonPlus::KaonPlus()->GetPDGMass();
87 MsRho= 775.5*MeV;
88 MsOm = 782.62*MeV;
89 MsF0 = 980.0*MeV;
90 MsA0 = 984.7*MeV;
91 MsPhi= 1019.46*MeV;
92 MsK892 = 891.66*MeV;
93 MsK0892 = 896.0*MeV;
94 GRho = 149.4*MeV;
95 GOm = 8.49*MeV;
96 GPhi = 4.26*MeV;
97 GK892 = 50.8*MeV;
98 GK0892 = 50.3*MeV;
99 PhRho = 0.0;
100 PhOm = 0.0;
101 PhPhi = 155.0*degree;
102 PhRhoPi = 186.0*degree;
103
104 BrRhoPiG = 4.5e-4;
105 BrRhoPi0G= 6.8e-4;
106 BrRhoEtaG= 2.95e-4;
107 BrRhoEe = 4.7e-5;
108 BrOm3Pi = 0.891;
109 BrOmPi0G= 0.089;
110 BrOmEtaG= 4.9e-4;
111 BrOm2Pi = 0.017;
112 PhOm2Pi = 90.0;
113 BrOmEe = 7.18e-5;
114 BrPhi2Kc = 0.492;
115 BrPhiKsKl= 0.34;
116 BrPhi3Pi = 0.153;
117 BrPhiPi0G= 1.25e-3;
118 BrPhiEtaG= 1.301e-2;
119 BrPhi2Pi = 7.3e-5;
120 PhPhi2Pi = -20.0*degree;
121 BrPhiEe = 2.97e-4;
122
123 MsRho3 = MsRho*MsRho*MsRho;
124 MsOm3 = MsOm*MsOm*MsOm;
125 MsPhi3 = MsPhi*MsPhi*MsPhi;
126
127 MeVnb = 3.8938e+11*nanobarn;
128 Alpha = fine_structure_const;
129
130 AOmRho = 3.0;
131 ARhoPRho = 0.72;
132 cterm=0.;
133 mssig = 600.*MeV;
134 gsig = 500.*MeV;
135 brsigpipi = 1.;
136
137 msrho1450 = 1459.*MeV;
138 msrho1700 = 1688.8*MeV;
139 grho1450 = 171.*MeV;
140 grho1700 = 161.*MeV;
141 arhoompi0 = 1.;
142 arho1450ompi0 = 1.;
143 arho1700ompi0 = 1.;
144 phrhoompi0 = 0.;
145 phrho1450ompi0 = pi;
146 phrho1700ompi0 = 0.;
147 aomrhopi0 = 1.;
148 phomrhopi0 = 0.;
149 arhopi0pi0g = 0.;
150 aompi0pi0g = 0.;
151 phrhopi0pi0g = 0.;
152 phompi0pi0g = 0.;
153 brrho1450ompi0 = 0.02;
154 brrho1450pipi = 0.50;
155 brrho1700ompi0 = 1.0;
156 brrho1700pipi = 0.02;
157 aphirhopi0 = 1.;
158 phphirhopi0 = pi;
159 arhosigg = 0.;
160 phrhosigg = 0.;
161 aomsigg = 0.;
162 phomsigg = 0.;
163
164 G4String w0, w1, w2;
165 ph3p = 0;
166
167 /*
168 G4double emin, emax;
169 G4int nbins;
170 const G4String fname = "wrhopi.wid";
171 ifstream fi(fname.c_str());
172 fi >> w0 >> nbins >> w1 >> emin >> w2 >> emax;
173 emin *= MeV;
174 emax *= MeV;
175 ph3p = new G4PhysicsLinearVector(emin,emax,nbins);
176 G4int nlines = nbins/5;
177 G4double s0, s1, s2, s3, s4;
178 for(G4int i=0; i<nlines; i++) {
179 fi >> s0 >> s1 >> s2 >> s3 >> s4;
180 ph3p->PutValue(5*i, s0);
181 ph3p->PutValue(5*i + 1, s1);
182 ph3p->PutValue(5*i + 2, s2);
183 ph3p->PutValue(5*i + 3, s3);
184 ph3p->PutValue(5*i + 4, s4);
185 }
186 fi.close();
187 */
188}
189
190//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
191
192G4double G4eeCrossSections::CrossSection2pi(G4double e)
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::CrossSection3pi(G4double e)
216{
217 complex<G4double> xf(cos(PhPhi2Pi),sin(PhPhi));
218
219 G4double s = e*e;
220 complex<G4double> dom = DpOm(e);
221 complex<G4double> dphi = DpPhi(e);
222
223 complex<G4double> amp =
224 sqrt(Width3p(s,MsOm,GOm,BrOm3Pi)*MsOm3*BrOmEe*GOm)/dom
225 + sqrt(Width3p(s,MsPhi,GPhi,BrPhi3Pi)*MsPhi3*BrPhiEe*GPhi)*xf/dphi;
226
227 G4double cross = 12.0*pi*MeVnb*norm(amp)/(e*s);
228
229 return cross;
230}
231
232//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
233
234G4double G4eeCrossSections::CrossSectionPi0G(G4double e)
235{
236 complex<G4double> xf(cos(PhPhi),sin(PhPhi));
237
238 G4double s = e*e;
239 complex<G4double> drho = DpRho(e);
240 complex<G4double> dom = DpOm(e);
241 complex<G4double> dphi = DpPhi(e);
242
243 complex<G4double> amp =
244 sqrt(WidthPg(s,MsRho,GRho,BrRhoPi0G,MsPi0)*MsRho3*BrRhoEe*GRho)/drho
245 + sqrt(WidthPg(s,MsOm,GOm,BrOmPi0G,MsPi0)*MsOm3*BrOmEe*GOm)/dom
246 + sqrt(WidthPg(s,MsPhi,GPhi,BrPhiPi0G,MsPi0)*MsPhi3*BrPhiEe*GPhi)*xf/dphi;
247
248 G4double cross = 12.0*pi*MeVnb*norm(amp)/(e*s);
249
250 return cross;
251}
252
253//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
254
255G4double G4eeCrossSections::CrossSectionEtaG(G4double e)
256{
257 complex<G4double> xf(cos(PhPhi),sin(PhPhi));
258
259 G4double s = e*e;
260 complex<G4double> drho = DpRho(e);
261 complex<G4double> dom = DpOm(e);
262 complex<G4double> dphi = DpPhi(e);
263
264 complex<G4double> amp =
265 sqrt(WidthPg(s,MsRho,GRho,BrRhoEtaG,MsEta)*MsRho3*BrRhoEe*GRho)/drho
266 + sqrt(WidthPg(s,MsOm,GOm,BrOmEtaG,MsEta)*MsOm3*BrOmEe*GOm)/dom
267 + sqrt(WidthPg(s,MsPhi,GPhi,BrPhiEtaG,MsEta)*MsPhi3*BrPhiEe*GPhi)*xf/dphi;
268
269 G4double cross = 12.0*pi*MeVnb*norm(amp)/(e*s);
270
271 return cross;
272}
273
274//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
275
276G4double G4eeCrossSections::CrossSection2Kcharged(G4double e)
277{
278 G4double s = e*e;
279 complex<G4double> dphi = DpPhi(e);
280
281 complex<G4double> amp =
282 sqrt(Width2p(s,MsPhi,GPhi,BrPhi2Kc,MsKc)*MsPhi3*BrPhiEe*GPhi)/dphi;
283
284 G4double cross = 12.0*pi*MeVnb*norm(amp)/(e*s);
285
286 return cross;
287}
288
289//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
290
291G4double G4eeCrossSections::CrossSection2Kneutral(G4double e)
292{
293 G4double s = e*e;
294 complex<G4double> dphi = DpPhi(e);
295
296 complex<G4double> amp =
297 sqrt(Width2p(s,MsPhi,GPhi,BrPhiKsKl,MsKs)*MsPhi3*BrPhiEe*GPhi)/dphi;
298
299 G4double cross = 12.0*pi*MeVnb*norm(amp)/(e*s);
300
301 return cross;
302}
303
304//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
305
306G4double G4eeCrossSections::Width2p(G4double s, G4double mres,
307 G4double g, G4double br, G4double m)
308{
309 G4double m2 = 4.0*m*m;
310 G4double s0 = mres*mres;
311 G4double f = (s - m2)/(s0 - m2);
312 if(f < 0.0) f = 0.0;
313 return g*br*sqrt(f)*f*s0/s;
314}
315
316//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
317
318G4double G4eeCrossSections::Width3p(G4double s, G4double mres,
319 G4double g, G4double br)
320{
321 G4double w = PhaseSpace3p(sqrt(s));
322 G4double w0= PhaseSpace3p(mres);
323 G4double x = g*br*w/w0;
324 return x;
325}
326
327//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
328
329G4double G4eeCrossSections::PhaseSpace3p(G4double e)
330{
331 // E.A.Kuraev, Z.K.Silagadze.
332 // Once more about the omega->3 pi contact term.
333 // Yadernaya Phisica, 1995, V58, N9, p.1678-1694.
334
335 // G4bool b;
336 // G4double x = ph3p->GetValue(e, b);
337 G4double x = 1.0;
338 G4double emev = e/MeV;
339 G4double y = 414.12/emev;
340 x *= pow(e/MsOm, 5.0) * pow(emev*0.1, 3.0)*(1.0 - y*y);
341 return x;
342}
343
344//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
345
346G4double G4eeCrossSections::WidthPg(G4double s, G4double mres,
347 G4double g, G4double br, G4double m)
348{
349 G4double m2 = m*m;
350 G4double s0 = mres*mres;
351 G4double f = (s - m2)*mres/((s0 - m2)*sqrt(s));
352 if(f < 0.0) f = 0.0;
353 return g*br*f*f*f;
354}
355
356//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
357
358G4double G4eeCrossSections::WidthRho(G4double e)
359{
360 G4double w = Width2p(e*e, MsRho, GRho, 1.0, MsPi);
361 return w;
362}
363
364//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
365
366G4double G4eeCrossSections::WidthOm(G4double e)
367{
368 G4double s = e*e;
369 G4double w = (Width3p(s, MsOm, GOm, BrOm3Pi) +
370 WidthPg(s, MsOm, GOm, BrOmPi0G, MsPi0) +
371 WidthPg(s, MsOm, GOm, BrOmEtaG, MsEta) +
372 Width2p(s, MsOm, GOm, BrOm2Pi, MsPi)) /
373 (BrOm3Pi+BrOmPi0G+BrOmEtaG+BrOm2Pi);
374 return w;
375}
376
377//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
378
379G4double G4eeCrossSections::WidthPhi(G4double e)
380{
381 G4double s = e*e;
382 G4double w = (Width3p(s, MsPhi, GPhi, BrPhi3Pi) +
383 WidthPg(s, MsPhi, GPhi, BrPhiPi0G, MsPi0) +
384 WidthPg(s, MsPhi, GPhi, BrPhiEtaG, MsEta) +
385 Width2p(s, MsPhi, GPhi, BrPhi2Kc, MsKc) +
386 Width2p(s, MsPhi, GPhi, BrPhiKsKl, MsKs)) /
387 (BrPhi3Pi+BrPhiPi0G+BrPhiEtaG+BrPhi2Kc+BrPhiKsKl);
388 return w;
389}
390
391//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
392
393complex<G4double> G4eeCrossSections::DpRho(G4double e)
394{
395 complex<G4double> d(MsRho*MsRho - e*e, -e*WidthRho(e));
396 return d;
397}
398
399//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
400
401complex<G4double> G4eeCrossSections::DpOm(G4double e)
402{
403 complex<G4double> d(MsOm*MsOm - e*e, -e*WidthOm(e));
404 return d;
405}
406
407//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
408
409complex<G4double> G4eeCrossSections::DpPhi(G4double e)
410{
411 complex<G4double> d(MsPhi*MsPhi - e*e, -e*WidthPhi(e));
412 return d;
413}
414
415//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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