1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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12 | // * institutes,nor the agencies providing financial support for this * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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16 | // * for the full disclaimer and the limitation of liability. * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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22 | // * use in resulting scientific publications, and indicate your * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // $Id: G4eeCrossSections.cc,v 1.7 2008/07/10 18:06:39 vnivanch Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-03-cand-01 $ |
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28 | // |
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29 | // ------------------------------------------------------------------- |
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30 | // |
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31 | // GEANT4 Class header file |
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32 | // |
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33 | // |
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34 | // File name: G4eeCrossSections |
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35 | // |
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36 | // Author: Vladimir Ivanchenko |
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37 | // |
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38 | // Creation date: 25.10.2003 |
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39 | // |
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40 | // Modifications: |
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41 | // 10.07.2008 Updated for PDG Jour. Physics, G33, 1 (2006) |
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42 | // |
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43 | // ------------------------------------------------------------------- |
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44 | // |
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45 | |
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46 | |
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47 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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48 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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49 | |
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50 | #include "G4eeCrossSections.hh" |
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51 | #include "G4PionPlus.hh" |
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52 | #include "G4PionMinus.hh" |
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53 | #include "G4PionZero.hh" |
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54 | #include "G4Eta.hh" |
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55 | #include "G4KaonPlus.hh" |
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56 | #include "G4KaonMinus.hh" |
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57 | #include "G4KaonZeroLong.hh" |
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58 | #include "G4PhysicsLinearVector.hh" |
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59 | |
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60 | #include <iostream> |
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61 | #include <fstream> |
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62 | |
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63 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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64 | |
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65 | using namespace std; |
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66 | |
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67 | G4eeCrossSections::G4eeCrossSections() |
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68 | { |
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69 | Initialise(); |
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70 | } |
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71 | |
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72 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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73 | |
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74 | G4eeCrossSections::~G4eeCrossSections() |
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75 | {} |
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76 | |
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77 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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78 | |
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79 | void G4eeCrossSections::Initialise() |
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80 | { |
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81 | MsPi = G4PionPlus::PionPlus()->GetPDGMass(); |
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82 | MsPi0= G4PionZero::PionZero()->GetPDGMass(); |
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83 | MsEta= G4Eta::Eta()->GetPDGMass(); |
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84 | MsEtap=957.78*MeV; |
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85 | MsKs = G4KaonZeroLong::KaonZeroLong()->GetPDGMass(); |
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86 | MsKc = G4KaonPlus::KaonPlus()->GetPDGMass(); |
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87 | MsRho= 775.5*MeV; |
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88 | MsOm = 782.62*MeV; |
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89 | MsF0 = 980.0*MeV; |
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90 | MsA0 = 984.7*MeV; |
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91 | MsPhi= 1019.46*MeV; |
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92 | MsK892 = 891.66*MeV; |
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93 | MsK0892 = 896.0*MeV; |
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94 | GRho = 149.4*MeV; |
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95 | GOm = 8.49*MeV; |
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96 | GPhi = 4.26*MeV; |
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97 | GK892 = 50.8*MeV; |
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98 | GK0892 = 50.3*MeV; |
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99 | PhRho = 0.0; |
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100 | PhOm = 0.0; |
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101 | PhPhi = 155.0*degree; |
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102 | PhRhoPi = 186.0*degree; |
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103 | |
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104 | BrRhoPiG = 4.5e-4; |
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105 | BrRhoPi0G= 6.8e-4; |
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106 | BrRhoEtaG= 2.95e-4; |
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107 | BrRhoEe = 4.7e-5; |
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108 | BrOm3Pi = 0.891; |
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109 | BrOmPi0G= 0.089; |
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110 | BrOmEtaG= 4.9e-4; |
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111 | BrOm2Pi = 0.017; |
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112 | PhOm2Pi = 90.0; |
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113 | BrOmEe = 7.18e-5; |
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114 | BrPhi2Kc = 0.492; |
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115 | BrPhiKsKl= 0.34; |
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116 | BrPhi3Pi = 0.153; |
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117 | BrPhiPi0G= 1.25e-3; |
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118 | BrPhiEtaG= 1.301e-2; |
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119 | BrPhi2Pi = 7.3e-5; |
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120 | PhPhi2Pi = -20.0*degree; |
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121 | BrPhiEe = 2.97e-4; |
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122 | |
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123 | MsRho3 = MsRho*MsRho*MsRho; |
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124 | MsOm3 = MsOm*MsOm*MsOm; |
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125 | MsPhi3 = MsPhi*MsPhi*MsPhi; |
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126 | |
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127 | MeVnb = 3.8938e+11*nanobarn; |
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128 | Alpha = fine_structure_const; |
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129 | |
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130 | AOmRho = 3.0; |
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131 | ARhoPRho = 0.72; |
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132 | cterm=0.; |
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133 | mssig = 600.*MeV; |
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134 | gsig = 500.*MeV; |
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135 | brsigpipi = 1.; |
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136 | |
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137 | msrho1450 = 1459.*MeV; |
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138 | msrho1700 = 1688.8*MeV; |
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139 | grho1450 = 171.*MeV; |
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140 | grho1700 = 161.*MeV; |
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141 | arhoompi0 = 1.; |
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142 | arho1450ompi0 = 1.; |
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143 | arho1700ompi0 = 1.; |
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144 | phrhoompi0 = 0.; |
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145 | phrho1450ompi0 = pi; |
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146 | phrho1700ompi0 = 0.; |
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147 | aomrhopi0 = 1.; |
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148 | phomrhopi0 = 0.; |
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149 | arhopi0pi0g = 0.; |
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150 | aompi0pi0g = 0.; |
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151 | phrhopi0pi0g = 0.; |
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152 | phompi0pi0g = 0.; |
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153 | brrho1450ompi0 = 0.02; |
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154 | brrho1450pipi = 0.50; |
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155 | brrho1700ompi0 = 1.0; |
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156 | brrho1700pipi = 0.02; |
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157 | aphirhopi0 = 1.; |
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158 | phphirhopi0 = pi; |
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159 | arhosigg = 0.; |
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160 | phrhosigg = 0.; |
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161 | aomsigg = 0.; |
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162 | phomsigg = 0.; |
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163 | |
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164 | G4String w0, w1, w2; |
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165 | ph3p = 0; |
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166 | |
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167 | /* |
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168 | G4double emin, emax; |
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169 | G4int nbins; |
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170 | const G4String fname = "wrhopi.wid"; |
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171 | ifstream fi(fname.c_str()); |
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172 | fi >> w0 >> nbins >> w1 >> emin >> w2 >> emax; |
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173 | emin *= MeV; |
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174 | emax *= MeV; |
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175 | ph3p = new G4PhysicsLinearVector(emin,emax,nbins); |
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176 | G4int nlines = nbins/5; |
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177 | G4double s0, s1, s2, s3, s4; |
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178 | for(G4int i=0; i<nlines; i++) { |
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179 | fi >> s0 >> s1 >> s2 >> s3 >> s4; |
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180 | ph3p->PutValue(5*i, s0); |
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181 | ph3p->PutValue(5*i + 1, s1); |
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182 | ph3p->PutValue(5*i + 2, s2); |
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183 | ph3p->PutValue(5*i + 3, s3); |
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184 | ph3p->PutValue(5*i + 4, s4); |
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185 | } |
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186 | fi.close(); |
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187 | */ |
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188 | } |
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189 | |
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190 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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191 | |
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192 | G4double G4eeCrossSections::CrossSection2pi(G4double e) |
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193 | { |
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194 | complex<G4double> xr(cos(PhRho),sin(PhRho)); |
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195 | complex<G4double> xo(cos(PhOm2Pi),sin(PhOm2Pi)); |
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196 | complex<G4double> xf(cos(PhPhi2Pi),sin(PhPhi2Pi)); |
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197 | |
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198 | G4double s = e*e; |
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199 | complex<G4double> drho = DpRho(e); |
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200 | complex<G4double> dom = DpOm(e); |
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201 | complex<G4double> dphi = DpPhi(e); |
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202 | |
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203 | complex<G4double> amp = |
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204 | sqrt(Width2p(s,MsRho,GRho,1.0,MsPi)*MsRho3*BrRhoEe*GRho)*xr/drho |
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205 | + sqrt(Width2p(s,MsOm,GOm,BrOm2Pi,MsPi)*MsOm3*BrOmEe*GOm)*xo/dom |
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206 | + sqrt(Width2p(s,MsPhi,GPhi,BrPhi2Pi,MsPi)*MsPhi3*BrPhiEe*GPhi)*xf/dphi; |
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207 | |
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208 | G4double cross = 12.0*pi*MeVnb*norm(amp)/(e*s); |
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209 | |
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210 | return cross; |
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211 | } |
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212 | |
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213 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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214 | |
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215 | G4double G4eeCrossSections::CrossSection3pi(G4double e) |
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216 | { |
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217 | complex<G4double> xf(cos(PhPhi2Pi),sin(PhPhi)); |
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218 | |
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219 | G4double s = e*e; |
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220 | complex<G4double> dom = DpOm(e); |
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221 | complex<G4double> dphi = DpPhi(e); |
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222 | |
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223 | complex<G4double> amp = |
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224 | sqrt(Width3p(s,MsOm,GOm,BrOm3Pi)*MsOm3*BrOmEe*GOm)/dom |
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225 | + sqrt(Width3p(s,MsPhi,GPhi,BrPhi3Pi)*MsPhi3*BrPhiEe*GPhi)*xf/dphi; |
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226 | |
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227 | G4double cross = 12.0*pi*MeVnb*norm(amp)/(e*s); |
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228 | |
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229 | return cross; |
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230 | } |
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231 | |
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232 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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233 | |
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234 | G4double G4eeCrossSections::CrossSectionPi0G(G4double e) |
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235 | { |
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236 | complex<G4double> xf(cos(PhPhi),sin(PhPhi)); |
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237 | |
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238 | G4double s = e*e; |
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239 | complex<G4double> drho = DpRho(e); |
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240 | complex<G4double> dom = DpOm(e); |
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241 | complex<G4double> dphi = DpPhi(e); |
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242 | |
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243 | complex<G4double> amp = |
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244 | sqrt(WidthPg(s,MsRho,GRho,BrRhoPi0G,MsPi0)*MsRho3*BrRhoEe*GRho)/drho |
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245 | + sqrt(WidthPg(s,MsOm,GOm,BrOmPi0G,MsPi0)*MsOm3*BrOmEe*GOm)/dom |
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246 | + sqrt(WidthPg(s,MsPhi,GPhi,BrPhiPi0G,MsPi0)*MsPhi3*BrPhiEe*GPhi)*xf/dphi; |
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247 | |
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248 | G4double cross = 12.0*pi*MeVnb*norm(amp)/(e*s); |
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249 | |
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250 | return cross; |
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251 | } |
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252 | |
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253 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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254 | |
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255 | G4double G4eeCrossSections::CrossSectionEtaG(G4double e) |
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256 | { |
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257 | complex<G4double> xf(cos(PhPhi),sin(PhPhi)); |
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258 | |
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259 | G4double s = e*e; |
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260 | complex<G4double> drho = DpRho(e); |
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261 | complex<G4double> dom = DpOm(e); |
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262 | complex<G4double> dphi = DpPhi(e); |
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263 | |
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264 | complex<G4double> amp = |
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265 | sqrt(WidthPg(s,MsRho,GRho,BrRhoEtaG,MsEta)*MsRho3*BrRhoEe*GRho)/drho |
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266 | + sqrt(WidthPg(s,MsOm,GOm,BrOmEtaG,MsEta)*MsOm3*BrOmEe*GOm)/dom |
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267 | + sqrt(WidthPg(s,MsPhi,GPhi,BrPhiEtaG,MsEta)*MsPhi3*BrPhiEe*GPhi)*xf/dphi; |
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268 | |
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269 | G4double cross = 12.0*pi*MeVnb*norm(amp)/(e*s); |
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270 | |
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271 | return cross; |
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272 | } |
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273 | |
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274 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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275 | |
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276 | G4double G4eeCrossSections::CrossSection2Kcharged(G4double e) |
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277 | { |
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278 | G4double s = e*e; |
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279 | complex<G4double> dphi = DpPhi(e); |
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280 | |
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281 | complex<G4double> amp = |
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282 | sqrt(Width2p(s,MsPhi,GPhi,BrPhi2Kc,MsKc)*MsPhi3*BrPhiEe*GPhi)/dphi; |
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283 | |
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284 | G4double cross = 12.0*pi*MeVnb*norm(amp)/(e*s); |
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285 | |
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286 | return cross; |
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287 | } |
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288 | |
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289 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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290 | |
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291 | G4double G4eeCrossSections::CrossSection2Kneutral(G4double e) |
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292 | { |
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293 | G4double s = e*e; |
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294 | complex<G4double> dphi = DpPhi(e); |
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295 | |
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296 | complex<G4double> amp = |
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297 | sqrt(Width2p(s,MsPhi,GPhi,BrPhiKsKl,MsKs)*MsPhi3*BrPhiEe*GPhi)/dphi; |
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298 | |
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299 | G4double cross = 12.0*pi*MeVnb*norm(amp)/(e*s); |
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300 | |
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301 | return cross; |
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302 | } |
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303 | |
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304 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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305 | |
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306 | G4double G4eeCrossSections::Width2p(G4double s, G4double mres, |
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307 | G4double g, G4double br, G4double m) |
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308 | { |
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309 | G4double m2 = 4.0*m*m; |
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310 | G4double s0 = mres*mres; |
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311 | G4double f = (s - m2)/(s0 - m2); |
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312 | if(f < 0.0) f = 0.0; |
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313 | return g*br*sqrt(f)*f*s0/s; |
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314 | } |
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315 | |
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316 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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317 | |
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318 | G4double G4eeCrossSections::Width3p(G4double s, G4double mres, |
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319 | G4double g, G4double br) |
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320 | { |
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321 | G4double w = PhaseSpace3p(sqrt(s)); |
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322 | G4double w0= PhaseSpace3p(mres); |
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323 | G4double x = g*br*w/w0; |
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324 | return x; |
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325 | } |
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326 | |
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327 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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328 | |
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329 | G4double G4eeCrossSections::PhaseSpace3p(G4double e) |
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330 | { |
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331 | // E.A.Kuraev, Z.K.Silagadze. |
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332 | // Once more about the omega->3 pi contact term. |
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333 | // Yadernaya Phisica, 1995, V58, N9, p.1678-1694. |
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334 | |
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335 | // G4bool b; |
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336 | // G4double x = ph3p->GetValue(e, b); |
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337 | G4double x = 1.0; |
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338 | G4double emev = e/MeV; |
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339 | G4double y = 414.12/emev; |
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340 | x *= pow(e/MsOm, 5.0) * pow(emev*0.1, 3.0)*(1.0 - y*y); |
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341 | return x; |
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342 | } |
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343 | |
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344 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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345 | |
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346 | G4double G4eeCrossSections::WidthPg(G4double s, G4double mres, |
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347 | G4double g, G4double br, G4double m) |
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348 | { |
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349 | G4double m2 = m*m; |
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350 | G4double s0 = mres*mres; |
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351 | G4double f = (s - m2)*mres/((s0 - m2)*sqrt(s)); |
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352 | if(f < 0.0) f = 0.0; |
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353 | return g*br*f*f*f; |
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354 | } |
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355 | |
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356 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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357 | |
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358 | G4double G4eeCrossSections::WidthRho(G4double e) |
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359 | { |
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360 | G4double w = Width2p(e*e, MsRho, GRho, 1.0, MsPi); |
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361 | return w; |
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362 | } |
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363 | |
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364 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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365 | |
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366 | G4double G4eeCrossSections::WidthOm(G4double e) |
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367 | { |
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368 | G4double s = e*e; |
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369 | G4double w = (Width3p(s, MsOm, GOm, BrOm3Pi) + |
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370 | WidthPg(s, MsOm, GOm, BrOmPi0G, MsPi0) + |
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371 | WidthPg(s, MsOm, GOm, BrOmEtaG, MsEta) + |
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372 | Width2p(s, MsOm, GOm, BrOm2Pi, MsPi)) / |
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373 | (BrOm3Pi+BrOmPi0G+BrOmEtaG+BrOm2Pi); |
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374 | return w; |
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375 | } |
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376 | |
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377 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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378 | |
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379 | G4double G4eeCrossSections::WidthPhi(G4double e) |
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380 | { |
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381 | G4double s = e*e; |
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382 | G4double w = (Width3p(s, MsPhi, GPhi, BrPhi3Pi) + |
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383 | WidthPg(s, MsPhi, GPhi, BrPhiPi0G, MsPi0) + |
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384 | WidthPg(s, MsPhi, GPhi, BrPhiEtaG, MsEta) + |
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385 | Width2p(s, MsPhi, GPhi, BrPhi2Kc, MsKc) + |
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386 | Width2p(s, MsPhi, GPhi, BrPhiKsKl, MsKs)) / |
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387 | (BrPhi3Pi+BrPhiPi0G+BrPhiEtaG+BrPhi2Kc+BrPhiKsKl); |
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388 | return w; |
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389 | } |
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390 | |
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391 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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392 | |
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393 | complex<G4double> G4eeCrossSections::DpRho(G4double e) |
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394 | { |
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395 | complex<G4double> d(MsRho*MsRho - e*e, -e*WidthRho(e)); |
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396 | return d; |
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397 | } |
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398 | |
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399 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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400 | |
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401 | complex<G4double> G4eeCrossSections::DpOm(G4double e) |
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402 | { |
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403 | complex<G4double> d(MsOm*MsOm - e*e, -e*WidthOm(e)); |
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404 | return d; |
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405 | } |
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406 | |
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407 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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408 | |
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409 | complex<G4double> G4eeCrossSections::DpPhi(G4double e) |
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410 | { |
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411 | complex<G4double> d(MsPhi*MsPhi - e*e, -e*WidthPhi(e)); |
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412 | return d; |
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413 | } |
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414 | |
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415 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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