1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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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 | // |
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27 | // $Id: G4DiffractiveExcitation.cc,v 1.7 2008/12/18 13:01:58 gunter Exp $ |
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28 | // ------------------------------------------------------------ |
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29 | // GEANT 4 class implemetation file |
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30 | // |
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31 | // ---------------- G4DiffractiveExcitation -------------- |
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32 | // by Gunter Folger, October 1998. |
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33 | // diffractive Excitation used by strings models |
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34 | // Take a projectile and a target |
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35 | // excite the projectile and target |
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36 | // Essential changed by V. Uzhinsky in November - December 2006 |
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37 | // in order to put it in a correspondence with original FRITIOF |
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38 | // model. Variant of FRITIOF with nucleon de-excitation is implemented. |
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39 | // Other changes by V.Uzhinsky in May 2007 were introduced to fit |
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40 | // meson-nucleon interactions. Additional changes by V. Uzhinsky |
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41 | // were introduced in December 2006. They treat diffraction dissociation |
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42 | // processes more exactly. |
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43 | // --------------------------------------------------------------------- |
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44 | |
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45 | |
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46 | #include "globals.hh" |
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47 | #include "Randomize.hh" |
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48 | |
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49 | #include "G4DiffractiveExcitation.hh" |
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50 | #include "G4LorentzRotation.hh" |
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51 | #include "G4ThreeVector.hh" |
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52 | #include "G4ParticleDefinition.hh" |
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53 | #include "G4VSplitableHadron.hh" |
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54 | #include "G4ExcitedString.hh" |
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55 | #include "G4FTFParameters.hh" // Uzhi 19.04.08 |
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56 | //#include "G4ios.hh" |
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57 | //#include "UZHI_diffraction.hh" |
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58 | |
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59 | G4DiffractiveExcitation::G4DiffractiveExcitation() |
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60 | { |
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61 | } |
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62 | |
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63 | // --------------------------------------------------------------------- |
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64 | G4bool G4DiffractiveExcitation:: |
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65 | ExciteParticipants(G4VSplitableHadron *projectile, |
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66 | G4VSplitableHadron *target, |
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67 | G4FTFParameters *theParameters) const |
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68 | { |
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69 | G4bool PutOnMassShell=0; |
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70 | |
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71 | // -------------------- Projectile parameters ----------------------- |
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72 | |
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73 | G4LorentzVector Pprojectile=projectile->Get4Momentum(); |
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74 | // G4double M0projectile=projectile->GetDefinition()->GetPDGMass(); // With de-excitation |
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75 | G4double M0projectile = Pprojectile.mag(); // Without de-excitation |
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76 | /* |
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77 | G4cout<<"ExciteParticipants-------------------"<<G4endl; |
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78 | G4cout<<"Mom "<<Pprojectile<<" mass "<<M0projectile<<G4endl; |
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79 | */ |
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80 | if(M0projectile < projectile->GetDefinition()->GetPDGMass()) |
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81 | { |
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82 | PutOnMassShell=1; |
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83 | M0projectile=projectile->GetDefinition()->GetPDGMass(); |
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84 | } |
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85 | |
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86 | G4double M0projectile2 = M0projectile * M0projectile; |
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87 | |
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88 | G4int PDGcode=projectile->GetDefinition()->GetPDGEncoding(); |
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89 | G4int absPDGcode=std::abs(PDGcode); |
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90 | |
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91 | G4double ProjectileDiffStateMinMass=theParameters->GetProjMinDiffMass(); |
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92 | G4double ProjectileNonDiffStateMinMass=theParameters->GetProjMinNonDiffMass(); |
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93 | G4double ProbProjectileDiffraction=theParameters->GetProbabilityOfProjDiff(); |
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94 | /* |
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95 | G4cout<<ProjectileDiffStateMinMass<<" "<<ProjectileNonDiffStateMinMass<<" "<<ProbProjectileDiffraction<<G4endl; |
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96 | */ |
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97 | // -------------------- Target paraExciteParticipantsmeters ------------------------- |
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98 | G4LorentzVector Ptarget=target->Get4Momentum(); |
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99 | G4double M0target = Ptarget.mag(); |
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100 | |
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101 | //G4cout<<"Mom "<<Ptarget<<" mass "<<M0target<<G4endl; |
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102 | |
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103 | if(M0target < target->GetDefinition()->GetPDGMass()) |
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104 | { |
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105 | PutOnMassShell=1; |
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106 | M0target=target->GetDefinition()->GetPDGMass(); |
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107 | } |
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108 | |
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109 | G4double M0target2 = M0target * M0target; //Ptarget.mag2(); |
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110 | // for AA-inter. |
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111 | G4double TargetDiffStateMinMass=theParameters->GetTarMinDiffMass(); |
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112 | G4double TargetNonDiffStateMinMass=theParameters->GetTarMinNonDiffMass(); |
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113 | G4double ProbTargetDiffraction=theParameters->GetProbabilityOfTarDiff(); |
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114 | /* |
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115 | G4cout<<TargetDiffStateMinMass<<" "<<TargetNonDiffStateMinMass<<" "<<ProbTargetDiffraction<<G4endl; |
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116 | */ |
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117 | G4double AveragePt2=theParameters->GetAveragePt2(); |
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118 | |
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119 | // Kinematical properties of the interactions -------------- |
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120 | G4LorentzVector Psum; // 4-momentum in CMS |
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121 | Psum=Pprojectile+Ptarget; |
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122 | G4double S=Psum.mag2(); |
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123 | |
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124 | //G4cout<<" sqrt(s) "<<std::sqrt(S)<<G4endl; |
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125 | |
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126 | // ------------------------------------------------------------------ |
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127 | |
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128 | //ProbProjectileDiffraction=1.; |
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129 | //ProbTargetDiffraction =1.; |
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130 | G4double ProbOfDiffraction=ProbProjectileDiffraction + |
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131 | ProbTargetDiffraction; |
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132 | |
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133 | if(ProbOfDiffraction!=0.) |
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134 | { |
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135 | ProbProjectileDiffraction/=ProbOfDiffraction; |
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136 | } |
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137 | else |
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138 | { |
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139 | ProbProjectileDiffraction=0.; |
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140 | } |
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141 | // ProbTargetDiffraction /=ProbOfDiffraction; |
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142 | |
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143 | //G4cout<<"ProbOfDiffraction "<<ProbOfDiffraction<<"ProbProjectileDiffraction "<<ProbProjectileDiffraction<<G4endl; // Vova |
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144 | |
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145 | G4double ProjectileDiffStateMinMass2 = ProjectileDiffStateMinMass * |
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146 | ProjectileDiffStateMinMass; |
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147 | G4double ProjectileNonDiffStateMinMass2 = ProjectileNonDiffStateMinMass * |
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148 | ProjectileNonDiffStateMinMass; |
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149 | |
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150 | G4double TargetDiffStateMinMass2 = TargetDiffStateMinMass * |
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151 | TargetDiffStateMinMass; |
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152 | G4double TargetNonDiffStateMinMass2 = TargetNonDiffStateMinMass * |
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153 | TargetNonDiffStateMinMass; |
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154 | |
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155 | // Transform momenta to cms and then rotate parallel to z axis; |
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156 | |
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157 | // G4LorentzVector Psum; |
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158 | // Psum=Pprojectile+Ptarget; |
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159 | |
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160 | G4LorentzRotation toCms(-1*Psum.boostVector()); |
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161 | |
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162 | G4LorentzVector Ptmp=toCms*Pprojectile; |
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163 | if ( Ptmp.pz() <= 0. ) |
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164 | { |
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165 | // "String" moving backwards in CMS, abort collision !! |
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166 | //G4cout << " abort Collision!! " << G4endl; |
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167 | return false; |
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168 | } |
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169 | |
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170 | toCms.rotateZ(-1*Ptmp.phi()); |
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171 | toCms.rotateY(-1*Ptmp.theta()); |
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172 | |
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173 | G4LorentzRotation toLab(toCms.inverse()); |
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174 | |
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175 | Pprojectile.transform(toCms); |
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176 | Ptarget.transform(toCms); |
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177 | |
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178 | G4double Pt2; |
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179 | G4double ProjMassT2, ProjMassT; |
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180 | G4double TargMassT2, TargMassT; |
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181 | G4double PZcms2, PZcms; |
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182 | G4double PMinusMin, PMinusMax; |
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183 | // G4double PPlusMin , PPlusMax; |
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184 | G4double TPlusMin , TPlusMax; |
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185 | G4double PMinusNew, PPlusNew, TPlusNew, TMinusNew; |
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186 | |
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187 | // G4double S=Psum.mag2(); |
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188 | G4double SqrtS=std::sqrt(S); |
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189 | |
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190 | if(absPDGcode > 1000 && SqrtS < 2200*MeV) |
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191 | {return false;} // The model cannot work for |
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192 | // p+p-interactions |
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193 | // at Plab < 1.3 GeV/c. |
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194 | |
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195 | if(( absPDGcode == 211 || PDGcode == 111) && SqrtS < 1600*MeV) |
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196 | {return false;} // The model cannot work for |
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197 | // Pi+p-interactions |
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198 | // at Plab < 1. GeV/c. |
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199 | |
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200 | if(( absPDGcode == 321 || PDGcode == -311) && SqrtS < 1600*MeV) |
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201 | {return false;} // The model cannot work for |
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202 | // K+p-interactions |
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203 | // at Plab < ??? GeV/c. ??? |
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204 | |
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205 | PZcms2=(S*S+M0projectile2*M0projectile2+M0target2*M0target2- |
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206 | 2*S*M0projectile2 - 2*S*M0target2 - 2*M0projectile2*M0target2) |
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207 | /4./S; |
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208 | |
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209 | if(PZcms2 < 0) |
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210 | {return false;} // It can be in an interaction with off-shell nuclear nucleon |
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211 | |
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212 | PZcms = std::sqrt(PZcms2); |
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213 | |
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214 | if(PutOnMassShell) |
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215 | { |
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216 | if(Pprojectile.z() > 0.) |
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217 | { |
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218 | Pprojectile.setPz( PZcms); |
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219 | Ptarget.setPz( -PZcms); |
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220 | } |
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221 | else |
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222 | { |
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223 | Pprojectile.setPz(-PZcms); |
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224 | Ptarget.setPz( PZcms); |
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225 | }; |
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226 | |
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227 | Pprojectile.setE(std::sqrt(M0projectile2 + |
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228 | Pprojectile.x()*Pprojectile.x()+ |
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229 | Pprojectile.y()*Pprojectile.y()+ |
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230 | PZcms2)); |
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231 | Ptarget.setE(std::sqrt(M0target2 + |
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232 | Ptarget.x()*Ptarget.x()+ |
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233 | Ptarget.y()*Ptarget.y()+ |
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234 | PZcms2)); |
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235 | } |
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236 | |
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237 | G4double maxPtSquare; // = PZcms2; |
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238 | /* |
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239 | G4cout << "Pprojectile aft boost : " << Pprojectile <<" "<<Pprojectile.mag()<< G4endl; |
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240 | G4cout << "Ptarget aft boost : " << Ptarget <<" "<<Ptarget.mag()<< G4endl; |
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241 | G4cout << "cms aft boost : " << (Pprojectile+ Ptarget) << G4endl; |
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242 | G4cout << " Projectile Xplus / Xminus : " << |
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243 | Pprojectile.plus() << " / " << Pprojectile.minus() << G4endl; |
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244 | G4cout << " Target Xplus / Xminus : " << Ptarget.plus() << " / " << Ptarget.minus() << G4endl; |
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245 | G4cout<<"maxPtSquare "<<maxPtSquare<<G4endl; |
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246 | */ |
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247 | G4LorentzVector Qmomentum; |
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248 | G4double Qminus, Qplus; |
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249 | |
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250 | G4int whilecount=0; |
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251 | // Choose a process |
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252 | |
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253 | if(G4UniformRand() < ProbOfDiffraction) |
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254 | { |
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255 | if(G4UniformRand() < ProbProjectileDiffraction) |
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256 | { //-------- projectile diffraction --------------- |
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257 | //G4cout<<" Projectile diffraction"<<G4endl; |
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258 | //Uzhi_projectilediffraction++; |
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259 | do { |
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260 | // Generate pt |
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261 | // if (whilecount++ >= 500 && (whilecount%100)==0) |
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262 | // G4cout << "G4DiffractiveExcitation::ExciteParticipants possibly looping" |
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263 | // << ", loop count/ maxPtSquare : " |
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264 | // << whilecount << " / " << maxPtSquare << G4endl; |
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265 | if (whilecount > 1000 ) |
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266 | { |
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267 | Qmomentum=G4LorentzVector(0.,0.,0.,0.); |
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268 | return false; // Ignore this interaction |
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269 | }; |
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270 | // --------------- Check that the interaction is possible ----------- |
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271 | ProjMassT2=ProjectileDiffStateMinMass2; |
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272 | ProjMassT =ProjectileDiffStateMinMass; |
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273 | |
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274 | TargMassT2=M0target2; |
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275 | TargMassT =M0target; |
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276 | |
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277 | PZcms2=(S*S + ProjMassT2*ProjMassT2 + TargMassT2*TargMassT2- |
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278 | 2.*S*ProjMassT2-2.*S*TargMassT2-2.*ProjMassT2*TargMassT2) |
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279 | /4./S; |
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280 | //G4cout<<" Pt2 Mpt Mtt Pz2 "<<Pt2<<" "<<ProjMassT<<" "<<TargMassT<<" "<<PZcms2<<G4endl; |
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281 | |
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282 | if(PZcms2 < 0 ) |
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283 | { |
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284 | /* |
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285 | G4cout<<"whilecount "<<whilecount<<" "<<Pt2<<" "<<ProjMassT<<" "<<TargMassT<<" "<<PZcms2<<G4endl; |
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286 | G4int Uzhi; G4cin>>Uzhi; |
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287 | */ |
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288 | return false; |
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289 | }; |
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290 | maxPtSquare=PZcms2; |
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291 | |
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292 | Qmomentum=G4LorentzVector(GaussianPt(AveragePt2,maxPtSquare),0); |
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293 | Pt2=G4ThreeVector(Qmomentum.vect()).mag2(); |
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294 | |
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295 | ProjMassT2=ProjectileDiffStateMinMass2+Pt2; |
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296 | ProjMassT =std::sqrt(ProjMassT2); |
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297 | |
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298 | TargMassT2=M0target2+Pt2; |
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299 | TargMassT =std::sqrt(TargMassT2); |
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300 | |
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301 | PZcms2=(S*S + ProjMassT2*ProjMassT2 + TargMassT2*TargMassT2- |
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302 | 2.*S*ProjMassT2-2.*S*TargMassT2-2.*ProjMassT2*TargMassT2) |
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303 | /4./S; |
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304 | //G4cout<<" Pt2 Mpt Mtt Pz2 "<<Pt2<<" "<<ProjMassT<<" "<<TargMassT<<" "<<PZcms2<<G4endl; |
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305 | |
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306 | // if(PZcms2 < 0 ) {PZcms2=0;}; |
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307 | if(PZcms2 < 0 ) continue; |
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308 | PZcms =std::sqrt(PZcms2); |
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309 | |
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310 | PMinusMin=std::sqrt(ProjMassT2+PZcms2)-PZcms; |
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311 | PMinusMax=SqrtS-TargMassT; |
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312 | //G4cout<<" SqrtS P+mim max "<<SqrtS<<" "<<PMinusMin<<" "<<PMinusMax<<G4endl; |
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313 | |
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314 | PMinusNew=ChooseP(PMinusMin, PMinusMax); |
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315 | // PMinusNew=1./sqrt(1./PMinusMin-G4UniformRand()*(1./PMinusMin-1./PMinusMax)); |
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316 | |
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317 | TMinusNew=SqrtS-PMinusNew; |
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318 | Qminus=Ptarget.minus()-TMinusNew; |
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319 | TPlusNew=TargMassT2/TMinusNew; |
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320 | Qplus=Ptarget.plus()-TPlusNew; |
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321 | |
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322 | Qmomentum.setPz( (Qplus-Qminus)/2 ); |
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323 | Qmomentum.setE( (Qplus+Qminus)/2 ); |
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324 | } while ( |
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325 | ((Pprojectile+Qmomentum).mag2() < ProjectileDiffStateMinMass2) || //No without excitation |
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326 | ((Ptarget -Qmomentum).mag2() < M0target2 )); |
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327 | } |
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328 | else |
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329 | { // -------------- Target diffraction ---------------- |
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330 | //G4cout<<" Target difraction"<<G4endl; |
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331 | //Uzhi_targetdiffraction++; |
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332 | do { |
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333 | // Generate pt |
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334 | // if (whilecount++ >= 500 && (whilecount%100)==0) |
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335 | // G4cout << "G4DiffractiveExcitation::ExciteParticipants possibly looping" |
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336 | // << ", loop count/ maxPtSquare : " |
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337 | // << whilecount << " / " << maxPtSquare << G4endl; |
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338 | if (whilecount > 1000 ) |
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339 | { |
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340 | Qmomentum=G4LorentzVector(0.,0.,0.,0.); |
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341 | return false; // Ignore this interaction |
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342 | }; |
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343 | // --------------- Check that the interaction is possible ----------- |
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344 | ProjMassT2=M0projectile2; |
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345 | ProjMassT =M0projectile; |
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346 | |
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347 | TargMassT2=TargetDiffStateMinMass2; |
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348 | TargMassT =TargetDiffStateMinMass; |
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349 | |
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350 | PZcms2=(S*S + ProjMassT2*ProjMassT2 + TargMassT2*TargMassT2- |
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351 | 2.*S*ProjMassT2-2.*S*TargMassT2-2.*ProjMassT2*TargMassT2) |
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352 | /4./S; |
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353 | //G4cout<<" Pt2 Mpt Mtt Pz2 "<<Pt2<<" "<<ProjMassT<<" "<<TargMassT<<" "<<PZcms2<<G4endl; |
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354 | |
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355 | if(PZcms2 < 0 ) |
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356 | { |
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357 | /* |
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358 | G4cout<<"whilecount "<<whilecount<<" "<<Pt2<<" "<<ProjMassT<<" "<<TargMassT<<" "<<PZcms2<<G4endl; |
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359 | G4int Uzhi; G4cin>>Uzhi; |
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360 | */ |
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361 | return false; |
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362 | }; |
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363 | maxPtSquare=PZcms2; |
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364 | |
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365 | Qmomentum=G4LorentzVector(GaussianPt(AveragePt2,maxPtSquare),0); |
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366 | Pt2=G4ThreeVector(Qmomentum.vect()).mag2(); |
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367 | |
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368 | ProjMassT2=M0projectile2+Pt2; |
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369 | ProjMassT =std::sqrt(ProjMassT2); |
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370 | |
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371 | TargMassT2=TargetDiffStateMinMass2+Pt2; |
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372 | TargMassT =std::sqrt(TargMassT2); |
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373 | |
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374 | PZcms2=(S*S + ProjMassT2*ProjMassT2 + TargMassT2*TargMassT2- |
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375 | 2.*S*ProjMassT2-2.*S*TargMassT2-2.*ProjMassT2*TargMassT2) |
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376 | /4./S; |
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377 | /* |
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378 | if(PZcms2 < 0 ) |
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379 | { |
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380 | G4cout<<"whilecount "<<whilecount<<" "<<Pt2<<" "<<ProjMassT<<" "<<TargMassT<<" "<<PZcms2<<G4endl; |
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381 | G4int Uzhi; G4cin>>Uzhi; |
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382 | return false; |
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383 | }; |
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384 | */ |
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385 | if(PZcms2 < 0 ) continue; |
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386 | PZcms =std::sqrt(PZcms2); |
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387 | |
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388 | TPlusMin=std::sqrt(TargMassT2+PZcms2)-PZcms; |
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389 | TPlusMax=SqrtS-ProjMassT; |
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390 | |
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391 | //G4cout<<" Tmin max "<<TPlusMin<<" "<<TPlusMax<<G4endl; |
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392 | |
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393 | TPlusNew=ChooseP(TPlusMin, TPlusMax); |
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394 | |
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395 | //TPlusNew=TPlusMax; |
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396 | //G4cout<<"T+new "<<TPlusNew<<G4endl; |
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397 | |
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398 | PPlusNew=SqrtS-TPlusNew; |
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399 | Qplus=PPlusNew-Pprojectile.plus(); |
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400 | PMinusNew=ProjMassT2/PPlusNew; |
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401 | Qminus=PMinusNew-Pprojectile.minus(); |
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402 | |
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403 | Qmomentum.setPz( (Qplus-Qminus)/2 ); |
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404 | Qmomentum.setE( (Qplus+Qminus)/2 ); |
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405 | |
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406 | } while ( |
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407 | ((Pprojectile+Qmomentum).mag2() < M0projectile2 ) || //No without excitation |
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408 | ((Ptarget -Qmomentum).mag2() < TargetDiffStateMinMass2)); |
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409 | } |
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410 | } |
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411 | else //----------- Non-diffraction process ------------ |
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412 | { |
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413 | //G4cout<<" Non-difraction"<<G4endl; |
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414 | do { |
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415 | // Generate pt |
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416 | // if (whilecount++ >= 500 && (whilecount%100)==0) |
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417 | // G4cout << "G4DiffractiveExcitation::ExciteParticipants possibly looping" |
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418 | // << ", loop count/ maxPtSquare : " |
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419 | // << whilecount << " / " << maxPtSquare << G4endl; |
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420 | if (whilecount > 1000 ) |
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421 | { |
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422 | Qmomentum=G4LorentzVector(0.,0.,0.,0.); |
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423 | return false; // Ignore this interaction |
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424 | }; |
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425 | // --------------- Check that the interaction is possible ----------- |
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426 | ProjMassT2=ProjectileNonDiffStateMinMass2; |
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427 | ProjMassT =ProjectileNonDiffStateMinMass; |
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428 | |
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429 | TargMassT2=TargetNonDiffStateMinMass2; |
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430 | TargMassT =TargetNonDiffStateMinMass; |
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431 | |
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432 | PZcms2=(S*S + ProjMassT2*ProjMassT2 + TargMassT2*TargMassT2- |
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433 | 2.*S*ProjMassT2-2.*S*TargMassT2-2.*ProjMassT2*TargMassT2) |
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434 | /4./S; |
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435 | //G4cout<<" Pt2 Mpt Mtt Pz2 "<<Pt2<<" "<<ProjMassT<<" "<<TargMassT<<" "<<PZcms2<<G4endl; |
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436 | |
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437 | if(PZcms2 < 0 ) |
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438 | { |
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439 | /* |
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440 | G4cout<<"whilecount "<<whilecount<<" "<<Pt2<<" "<<ProjMassT<<" "<<TargMassT<<" "<<PZcms2<<G4endl; |
---|
441 | G4int Uzhi; G4cin>>Uzhi; |
---|
442 | */ |
---|
443 | return false; |
---|
444 | }; |
---|
445 | maxPtSquare=PZcms2; |
---|
446 | Qmomentum=G4LorentzVector(GaussianPt(AveragePt2,maxPtSquare),0); |
---|
447 | Pt2=G4ThreeVector(Qmomentum.vect()).mag2(); |
---|
448 | |
---|
449 | ProjMassT2=ProjectileNonDiffStateMinMass2+Pt2; |
---|
450 | ProjMassT =std::sqrt(ProjMassT2); |
---|
451 | |
---|
452 | TargMassT2=TargetNonDiffStateMinMass2+Pt2; |
---|
453 | TargMassT =std::sqrt(TargMassT2); |
---|
454 | |
---|
455 | PZcms2=(S*S + ProjMassT2*ProjMassT2 + TargMassT2*TargMassT2- |
---|
456 | 2.*S*ProjMassT2-2.*S*TargMassT2-2.*ProjMassT2*TargMassT2) |
---|
457 | /4./S; |
---|
458 | /* |
---|
459 | G4cout<<"ProjectileNonDiffStateMinMass2 "<<ProjectileNonDiffStateMinMass2<<G4endl; |
---|
460 | G4cout<<"TargetNonDiffStateMinMass2 "<<TargetNonDiffStateMinMass2<<G4endl; |
---|
461 | G4cout<<"Mt "<<ProjMassT<<" "<<TargMassT<<" "<<Pt2<<" "<<PZcms2<<G4endl<<G4endl; |
---|
462 | */ |
---|
463 | // if(PZcms2 < 0 ) {PZcms2=0;}; |
---|
464 | if(PZcms2 < 0 ) continue; |
---|
465 | PZcms =std::sqrt(PZcms2); |
---|
466 | |
---|
467 | PMinusMin=std::sqrt(ProjMassT2+PZcms2)-PZcms; |
---|
468 | PMinusMax=SqrtS-TargMassT; |
---|
469 | |
---|
470 | PMinusNew=ChooseP(PMinusMin, PMinusMax); |
---|
471 | // PMinusNew=1./sqrt(1./PMinusMin-G4UniformRand()*(1./PMinusMin-1./PMinusMax)); |
---|
472 | |
---|
473 | //G4cout<<"Proj "<<PMinusMin<<" "<<PMinusMax<<" "<<PMinusNew<<G4endl; |
---|
474 | |
---|
475 | //PMinusNew=PMinusMax; //+++++++++++++++++++++++++++++++++++ Vova |
---|
476 | |
---|
477 | Qminus=PMinusNew-Pprojectile.minus(); |
---|
478 | |
---|
479 | TPlusMin=std::sqrt(TargMassT2+PZcms2)-PZcms; |
---|
480 | // TPlusMax=SqrtS-PMinusNew; // Vova |
---|
481 | TPlusMax=SqrtS-ProjMassT; // Vova |
---|
482 | |
---|
483 | TPlusNew=ChooseP(TPlusMin, TPlusMax); |
---|
484 | |
---|
485 | //G4cout<<"Targ "<<TPlusMin<<" "<<TPlusMax<<" "<<TPlusNew<<G4endl; |
---|
486 | //G4cout<<PMinusNew<<" "<<TPlusNew<<G4endl; |
---|
487 | |
---|
488 | Qplus=-(TPlusNew-Ptarget.plus()); |
---|
489 | |
---|
490 | Qmomentum.setPz( (Qplus-Qminus)/2 ); |
---|
491 | Qmomentum.setE( (Qplus+Qminus)/2 ); |
---|
492 | /* |
---|
493 | G4cout << "Qplus / Qminus " << Qplus << " / " << Qminus<<G4endl; |
---|
494 | G4cout << "pt2" << pt2 << G4endl; |
---|
495 | G4cout << "Qmomentum " << Qmomentum << G4endl; |
---|
496 | G4cout << " Masses (P/T) : " << (Pprojectile+Qmomentum).mag() << |
---|
497 | " / " << (Ptarget-Qmomentum).mag() << G4endl; // mag() |
---|
498 | G4cout<<"Mprojectile "<<std::sqrt(M0projectile2)<<G4endl; |
---|
499 | G4cout<<"Mtarget "<<std::sqrt(M0target2 )<<G4endl; |
---|
500 | G4cout<<"ProjectileDiffStateMinMass "<<std::sqrt(ProjectileDiffStateMinMass2)<<G4endl; |
---|
501 | G4cout<<"TargetDiffStateMinMass "<<std::sqrt(TargetDiffStateMinMass2)<<G4endl; |
---|
502 | */ |
---|
503 | } while ( |
---|
504 | ((Pprojectile+Qmomentum).mag2() < ProjectileNonDiffStateMinMass2) || //No double Diffraction |
---|
505 | ((Ptarget -Qmomentum).mag2() < TargetNonDiffStateMinMass2 )); |
---|
506 | } |
---|
507 | |
---|
508 | //G4int Uzhiinp; G4cin>>Uzhiinp; // Vova |
---|
509 | |
---|
510 | Pprojectile += Qmomentum; |
---|
511 | Ptarget -= Qmomentum; |
---|
512 | /* |
---|
513 | G4cout << "Pprojectile with Q : " << Pprojectile << G4endl; |
---|
514 | G4cout << "Ptarget with Q : " << Ptarget << G4endl; |
---|
515 | G4cout << "Target mass " << Ptarget.mag() << G4endl; |
---|
516 | G4cout << "Projectile mass " << Pprojectile.mag() << G4endl; |
---|
517 | // |
---|
518 | //G4cout << "Projectile back: " << toLab * Pprojectile << G4endl; |
---|
519 | //G4cout << "Target back: " << toLab * Ptarget << G4endl; |
---|
520 | */ |
---|
521 | //-------------- Flip if projectale moves in backward direction ------------ |
---|
522 | //G4bool Flip=Pprojectile.pz()< 0.; |
---|
523 | |
---|
524 | |
---|
525 | // Transform back and update SplitableHadron Participant. |
---|
526 | Pprojectile.transform(toLab); |
---|
527 | Ptarget.transform(toLab); |
---|
528 | |
---|
529 | //G4cout << "Pprojectile with Q M: " << Pprojectile<<" "<< Pprojectile.mag() << G4endl; |
---|
530 | //G4cout << "Ptarget with Q M: " << Ptarget <<" "<< Ptarget.mag() << G4endl; |
---|
531 | //G4cout << "Target mass " << Ptarget.mag() << G4endl; |
---|
532 | //G4cout << "Projectile mass " << Pprojectile.mag() << G4endl; |
---|
533 | |
---|
534 | /* |
---|
535 | if(!Flip){ |
---|
536 | projectile->Set4Momentum(Pprojectile); |
---|
537 | target->Set4Momentum(Ptarget); |
---|
538 | } |
---|
539 | else { |
---|
540 | G4ParticleDefinition * t_Definition=projectile->GetDefinition(); |
---|
541 | projectile->SetDefinition(target->GetDefinition()); |
---|
542 | projectile->Set4Momentum(Ptarget); |
---|
543 | target->SetDefinition(t_Definition); |
---|
544 | target->Set4Momentum(Pprojectile); |
---|
545 | } |
---|
546 | */ |
---|
547 | // |
---|
548 | /* |
---|
549 | if(G4UniformRand() < 1.) { |
---|
550 | G4ParticleDefinition * t_Definition=projectile->GetDefinition(); |
---|
551 | projectile->SetDefinition(target->GetDefinition()); |
---|
552 | target->SetDefinition(t_Definition); |
---|
553 | } |
---|
554 | */ // For flip, for HARP |
---|
555 | |
---|
556 | G4double ZcoordinateOfCurrentInteraction = target->GetPosition().z(); |
---|
557 | // It is assumed that nucleon z-coordinates are ordered on increasing ----------- |
---|
558 | |
---|
559 | G4double betta_z=projectile->Get4Momentum().pz()/projectile->Get4Momentum().e(); |
---|
560 | |
---|
561 | G4double ZcoordinateOfPreviousCollision=projectile->GetPosition().z(); |
---|
562 | if(projectile->GetSoftCollisionCount()==0) { |
---|
563 | projectile->SetTimeOfCreation(0.); |
---|
564 | target->SetTimeOfCreation(0.); |
---|
565 | ZcoordinateOfPreviousCollision=ZcoordinateOfCurrentInteraction; |
---|
566 | } |
---|
567 | |
---|
568 | G4ThreeVector thePosition(projectile->GetPosition().x(), |
---|
569 | projectile->GetPosition().y(), |
---|
570 | ZcoordinateOfCurrentInteraction); |
---|
571 | projectile->SetPosition(thePosition); |
---|
572 | |
---|
573 | G4double TimeOfPreviousCollision=projectile->GetTimeOfCreation(); |
---|
574 | G4double TimeOfCurrentCollision=TimeOfPreviousCollision+ |
---|
575 | (ZcoordinateOfCurrentInteraction-ZcoordinateOfPreviousCollision)/betta_z; |
---|
576 | |
---|
577 | projectile->SetTimeOfCreation(TimeOfCurrentCollision); |
---|
578 | target->SetTimeOfCreation(TimeOfCurrentCollision); |
---|
579 | |
---|
580 | projectile->Set4Momentum(Pprojectile); |
---|
581 | target->Set4Momentum(Ptarget); |
---|
582 | |
---|
583 | projectile->IncrementCollisionCount(1); |
---|
584 | target->IncrementCollisionCount(1); |
---|
585 | |
---|
586 | // |
---|
587 | //G4cout<<"Out of Excitation --------------------"<<G4endl; |
---|
588 | //G4int Uzhiinp; G4cin>>Uzhiinp; // Vova |
---|
589 | |
---|
590 | return true; |
---|
591 | } |
---|
592 | |
---|
593 | // --------------------------------------------------------------------- |
---|
594 | G4ExcitedString * G4DiffractiveExcitation:: |
---|
595 | String(G4VSplitableHadron * hadron, G4bool isProjectile) const |
---|
596 | { |
---|
597 | |
---|
598 | //G4cout<<"G4DiffractiveExcitation::String isProj"<<isProjectile<<G4endl; |
---|
599 | |
---|
600 | hadron->SplitUp(); |
---|
601 | G4Parton *start= hadron->GetNextParton(); |
---|
602 | if ( start==NULL) |
---|
603 | { G4cout << " G4FTFModel::String() Error:No start parton found"<< G4endl; |
---|
604 | return NULL; |
---|
605 | } |
---|
606 | G4Parton *end = hadron->GetNextParton(); |
---|
607 | if ( end==NULL) |
---|
608 | { G4cout << " G4FTFModel::String() Error:No end parton found"<< G4endl; |
---|
609 | return NULL; |
---|
610 | } |
---|
611 | |
---|
612 | G4ExcitedString * string; |
---|
613 | if ( isProjectile ) |
---|
614 | { |
---|
615 | string= new G4ExcitedString(end,start, +1); |
---|
616 | } else { |
---|
617 | string= new G4ExcitedString(start,end, -1); |
---|
618 | } |
---|
619 | // Uzhi |
---|
620 | //G4cout<<"G4ExcitedString * G4DiffractiveExcitation::String"<<G4endl; |
---|
621 | //G4cout<<hadron->GetTimeOfCreation()<<" "<<hadron->GetPosition()/fermi<<G4endl; |
---|
622 | |
---|
623 | string->SetTimeOfCreation(hadron->GetTimeOfCreation()); |
---|
624 | string->SetPosition(hadron->GetPosition()); |
---|
625 | |
---|
626 | // momenta of string ends |
---|
627 | // |
---|
628 | G4double Momentum=hadron->Get4Momentum().vect().mag(); |
---|
629 | G4double Plus=hadron->Get4Momentum().e() + Momentum; |
---|
630 | G4double Minus=hadron->Get4Momentum().e() - Momentum; |
---|
631 | |
---|
632 | G4ThreeVector tmp; |
---|
633 | if(Momentum > 0.) |
---|
634 | { |
---|
635 | tmp.set(hadron->Get4Momentum().px(), |
---|
636 | hadron->Get4Momentum().py(), |
---|
637 | hadron->Get4Momentum().pz()); |
---|
638 | tmp/=Momentum; |
---|
639 | } |
---|
640 | else |
---|
641 | { |
---|
642 | tmp.set(0.,0.,1.); |
---|
643 | }; |
---|
644 | |
---|
645 | G4LorentzVector Pstart(tmp,0.); |
---|
646 | G4LorentzVector Pend(tmp,0.); |
---|
647 | |
---|
648 | if(isProjectile) |
---|
649 | { |
---|
650 | Pstart*=(-1.)*Minus/2.; |
---|
651 | Pend *=(+1.)*Plus /2.; |
---|
652 | } |
---|
653 | else |
---|
654 | { |
---|
655 | Pstart*=(+1.)*Plus/2.; |
---|
656 | Pend *=(-1.)*Minus/2.; |
---|
657 | }; |
---|
658 | |
---|
659 | Momentum=-Pstart.mag(); |
---|
660 | Pstart.setT(Momentum); // It is assumed that quark has m=0. |
---|
661 | |
---|
662 | Momentum=-Pend.mag(); |
---|
663 | Pend.setT(Momentum); // It is assumed that di-quark has m=0. |
---|
664 | // |
---|
665 | /* Uzhi |
---|
666 | G4double ptSquared= hadron->Get4Momentum().perp2(); |
---|
667 | G4double transverseMassSquared= hadron->Get4Momentum().plus() |
---|
668 | * hadron->Get4Momentum().minus(); |
---|
669 | |
---|
670 | |
---|
671 | G4double maxAvailMomentumSquared= |
---|
672 | sqr( std::sqrt(transverseMassSquared) - std::sqrt(ptSquared) ); |
---|
673 | |
---|
674 | G4double widthOfPtSquare = 0.25*GeV*GeV; // Uzhi 11.07 <Pt^2>=0.25 ?????????????????? |
---|
675 | G4ThreeVector pt=GaussianPt(widthOfPtSquare,maxAvailMomentumSquared); |
---|
676 | |
---|
677 | G4LorentzVector Pstart(G4LorentzVector(pt,0.)); |
---|
678 | G4LorentzVector Pend; |
---|
679 | Pend.setPx(hadron->Get4Momentum().px() - pt.x()); |
---|
680 | Pend.setPy(hadron->Get4Momentum().py() - pt.y()); |
---|
681 | |
---|
682 | G4double tm1=hadron->Get4Momentum().minus() + |
---|
683 | ( Pend.perp2()-Pstart.perp2() ) / hadron->Get4Momentum().plus(); |
---|
684 | |
---|
685 | G4double tm2= std::sqrt( std::max(0., sqr(tm1) - |
---|
686 | 4. * Pend.perp2() * hadron->Get4Momentum().minus() |
---|
687 | / hadron->Get4Momentum().plus() )); |
---|
688 | |
---|
689 | G4int Sign= isProjectile ? -1 : 1; |
---|
690 | |
---|
691 | G4double endMinus = 0.5 * (tm1 + Sign*tm2); |
---|
692 | G4double startMinus= hadron->Get4Momentum().minus() - endMinus; |
---|
693 | |
---|
694 | G4double startPlus= Pstart.perp2() / startMinus; |
---|
695 | G4double endPlus = hadron->Get4Momentum().plus() - startPlus; |
---|
696 | |
---|
697 | Pstart.setPz(0.5*(startPlus - startMinus)); |
---|
698 | Pstart.setE(0.5*(startPlus + startMinus)); |
---|
699 | |
---|
700 | Pend.setPz(0.5*(endPlus - endMinus)); |
---|
701 | Pend.setE(0.5*(endPlus + endMinus)); |
---|
702 | */ // Uzhi |
---|
703 | start->Set4Momentum(Pstart); |
---|
704 | end->Set4Momentum(Pend); |
---|
705 | /* |
---|
706 | G4cout<<"G4DiffractiveExcitation::String hadro"<<hadron->Get4Momentum()<<" "<<hadron->Get4Momentum().mag2()<<G4endl; |
---|
707 | |
---|
708 | G4cout<<"G4DiffractiveExcitation::String start"<<start->Get4Momentum()<<" "<<start->GetPDGcode()<<G4endl; |
---|
709 | |
---|
710 | G4cout<<"G4DiffractiveExcitation::String end "<< end->Get4Momentum()<<" "<< end->GetPDGcode()<<G4endl; |
---|
711 | G4int Uzhi; G4cin>>Uzhi; |
---|
712 | */ |
---|
713 | #ifdef G4_FTFDEBUG |
---|
714 | G4cout << " generated string flavors " |
---|
715 | << start->GetPDGcode() << " / " |
---|
716 | << end->GetPDGcode() << G4endl; |
---|
717 | G4cout << " generated string momenta: quark " |
---|
718 | << start->Get4Momentum() << "mass : " |
---|
719 | <<start->Get4Momentum().mag() << G4endl; |
---|
720 | G4cout << " generated string momenta: Diquark " |
---|
721 | << end ->Get4Momentum() |
---|
722 | << "mass : " <<end->Get4Momentum().mag()<< G4endl; |
---|
723 | G4cout << " sum of ends " << Pstart+Pend << G4endl; |
---|
724 | G4cout << " Original " << hadron->Get4Momentum() << G4endl; |
---|
725 | #endif |
---|
726 | |
---|
727 | return string; |
---|
728 | } |
---|
729 | |
---|
730 | |
---|
731 | // --------- private methods ---------------------- |
---|
732 | |
---|
733 | // --------------------------------------------------------------------- |
---|
734 | G4double G4DiffractiveExcitation::ChooseP(G4double Pmin, G4double Pmax) const // Uzhi |
---|
735 | { |
---|
736 | // choose an x between Xmin and Xmax with P(x) ~ 1/x |
---|
737 | // to be improved... |
---|
738 | |
---|
739 | G4double range=Pmax-Pmin; // Uzhi |
---|
740 | |
---|
741 | if ( Pmin <= 0. || range <=0. ) |
---|
742 | { |
---|
743 | G4cout << " Pmin, range : " << Pmin << " , " << range << G4endl; |
---|
744 | throw G4HadronicException(__FILE__, __LINE__, "G4DiffractiveExcitation::ChooseP : Invalid arguments "); |
---|
745 | } |
---|
746 | |
---|
747 | G4double P; |
---|
748 | /* // Uzhi |
---|
749 | do { |
---|
750 | x=Xmin + G4UniformRand() * range; |
---|
751 | } while ( Xmin/x < G4UniformRand() ); |
---|
752 | */ // Uzhi |
---|
753 | |
---|
754 | P=Pmin * std::pow(Pmax/Pmin,G4UniformRand()); // Uzhi |
---|
755 | |
---|
756 | //debug-hpw cout << "DiffractiveX "<<x<<G4endl; |
---|
757 | return P; |
---|
758 | } |
---|
759 | |
---|
760 | // --------------------------------------------------------------------- |
---|
761 | G4ThreeVector G4DiffractiveExcitation::GaussianPt(G4double AveragePt2, |
---|
762 | G4double maxPtSquare) const // Uzhi |
---|
763 | { // @@ this method is used in FTFModel as well. Should go somewhere common! |
---|
764 | |
---|
765 | G4double Pt2; |
---|
766 | /* // Uzhi |
---|
767 | do { |
---|
768 | pt2=widthSquare * std::log( G4UniformRand() ); |
---|
769 | } while ( pt2 > maxPtSquare); |
---|
770 | */ // Uzhi |
---|
771 | |
---|
772 | Pt2 = -AveragePt2 * std::log(1. + G4UniformRand() * |
---|
773 | (std::exp(-maxPtSquare/AveragePt2)-1.));// Uzhi |
---|
774 | |
---|
775 | G4double Pt=std::sqrt(Pt2); |
---|
776 | |
---|
777 | G4double phi=G4UniformRand() * twopi; |
---|
778 | |
---|
779 | return G4ThreeVector (Pt*std::cos(phi), Pt*std::sin(phi), 0.); |
---|
780 | } |
---|
781 | |
---|
782 | // --------------------------------------------------------------------- |
---|
783 | G4DiffractiveExcitation::G4DiffractiveExcitation(const G4DiffractiveExcitation &) |
---|
784 | { |
---|
785 | throw G4HadronicException(__FILE__, __LINE__, "G4DiffractiveExcitation copy contructor not meant to be called"); |
---|
786 | } |
---|
787 | |
---|
788 | |
---|
789 | G4DiffractiveExcitation::~G4DiffractiveExcitation() |
---|
790 | { |
---|
791 | } |
---|
792 | |
---|
793 | |
---|
794 | const G4DiffractiveExcitation & G4DiffractiveExcitation::operator=(const G4DiffractiveExcitation &) |
---|
795 | { |
---|
796 | throw G4HadronicException(__FILE__, __LINE__, "G4DiffractiveExcitation = operator meant to be called"); |
---|
797 | return *this; |
---|
798 | } |
---|
799 | |
---|
800 | |
---|
801 | int G4DiffractiveExcitation::operator==(const G4DiffractiveExcitation &) const |
---|
802 | { |
---|
803 | throw G4HadronicException(__FILE__, __LINE__, "G4DiffractiveExcitation == operator meant to be called"); |
---|
804 | return false; |
---|
805 | } |
---|
806 | |
---|
807 | int G4DiffractiveExcitation::operator!=(const G4DiffractiveExcitation &) const |
---|
808 | { |
---|
809 | throw G4HadronicException(__FILE__, __LINE__, "G4DiffractiveExcitation != operator meant to be called"); |
---|
810 | return true; |
---|
811 | } |
---|