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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9 | // * include a list of copyright holders. * |
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10 | // * * |
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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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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: G4QHadron.cc,v 1.54 2009/02/23 09:49:24 mkossov Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-03-beta-cand-01 $ |
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29 | // |
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30 | // ---------------- G4QHadron ---------------- |
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31 | // by Mikhail Kossov, Sept 1999. |
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32 | // class for Quasmon initiated Hadrons generated by CHIPS Model |
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33 | // ------------------------------------------------------------------- |
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34 | // Short description: In CHIPS all particles are G4QHadrons, while they |
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35 | // can be leptons, gammas or nuclei. The G4QPDGCode makes the difference. |
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36 | // In addition the 4-momentum is a basic value, so the mass can be |
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37 | // different from the GS mass (e.g. for the virtual gamma). |
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38 | // ------------------------------------------------------------------- |
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39 | // |
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40 | //#define debug |
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41 | //#define pdebug |
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42 | //#define sdebug |
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43 | //#define ppdebug |
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44 | |
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45 | #include "G4QHadron.hh" |
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46 | #include <cmath> |
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47 | using namespace std; |
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48 | |
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49 | G4double G4QHadron::alpha = -0.5; // changing rapidity distribution for all |
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50 | G4double G4QHadron::beta = 2.5; // changing rapidity distribution for projectile region |
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51 | G4double G4QHadron::theMinPz = 70.*MeV; // Can be from 14 to 140 MeV |
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52 | G4double G4QHadron::StrangeSuppress = 0.48; // ? M.K. |
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53 | G4double G4QHadron::sigmaPt = 1.7*GeV; // Can be 0 |
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54 | G4double G4QHadron::widthOfPtSquare = 0.01*GeV*GeV; // ? M.K. |
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55 | G4double G4QHadron::minTransverseMass = 1.*keV; // ? M.K. |
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56 | |
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57 | G4QHadron::G4QHadron() : theQPDG(0),theMomentum(0.,0.,0.,0.),valQ(0,0,0,0,0,0),nFragm(0), |
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58 | thePosition(0.,0.,0.),theCollisionCount(0),isSplit(false),Direction(true), |
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59 | Color(),AntiColor(),bindE(0.),formTime(0.) {} |
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60 | |
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61 | G4QHadron::G4QHadron(G4LorentzVector p) : theQPDG(0),theMomentum(p),valQ(0,0,0,0,0,0), |
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62 | nFragm(0),thePosition(0.,0.,0.),theCollisionCount(0),isSplit(false),Direction(true), |
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63 | Color(),AntiColor(),bindE(0.),formTime(0.) {} |
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64 | |
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65 | // For Chipolino or Quasmon doesn't make any sense |
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66 | G4QHadron::G4QHadron(G4int PDGCode, G4LorentzVector p) : theQPDG(PDGCode),theMomentum(p), |
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67 | nFragm(0),thePosition(0.,0.,0.),theCollisionCount(0),isSplit(false),Direction(true), |
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68 | Color(),AntiColor(),bindE(0.),formTime(0.) |
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69 | { |
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70 | #ifdef debug |
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71 | G4cout<<"G4QHadron must be created with PDG="<<PDGCode<<", 4M="<<p<<G4endl; |
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72 | #endif |
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73 | if(GetQCode()>-1) |
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74 | { |
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75 | if(theMomentum.e()==0.) theMomentum.setE(theQPDG.GetMass()); |
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76 | valQ=theQPDG.GetQuarkContent(); |
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77 | } |
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78 | else if(PDGCode>80000000) DefineQC(PDGCode); |
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79 | else G4cerr<<"***G4QHadron:(P) PDG="<<PDGCode<<", use other constructor"<<G4endl; |
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80 | #ifdef debug |
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81 | G4cout<<"G4QHadron is created with QCode="<<GetQCode()<<", QC="<<valQ<<G4endl; |
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82 | #endif |
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83 | } |
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84 | |
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85 | // For Chipolino or Quasmon doesn't make any sense |
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86 | G4QHadron::G4QHadron(G4QPDGCode QPDG, G4LorentzVector p) : theQPDG(QPDG),theMomentum(p), |
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87 | nFragm(0),thePosition(0.,0.,0.),theCollisionCount(0),isSplit(false),Direction(true), |
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88 | Color(),AntiColor(),bindE(0.),formTime(0.) |
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89 | { |
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90 | if(theQPDG.GetQCode()>-1) |
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91 | { |
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92 | if(theMomentum.e()==0.) theMomentum.setE(theQPDG.GetMass()); |
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93 | valQ=theQPDG.GetQuarkContent(); |
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94 | } |
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95 | else |
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96 | { |
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97 | G4int cPDG=theQPDG.GetPDGCode(); |
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98 | if(cPDG>80000000) DefineQC(cPDG); |
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99 | else G4cerr<<"***G4QHadr:(QP) PDG="<<cPDG<<" use other constructor"<<G4endl; |
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100 | } |
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101 | } |
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102 | |
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103 | // Make sense Chipolino or Quasmon |
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104 | G4QHadron::G4QHadron(G4QContent QC, G4LorentzVector p): theQPDG(0),theMomentum(p),valQ(QC), |
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105 | nFragm(0),thePosition(0.,0.,0.),theCollisionCount(0),isSplit(false),Direction(true), |
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106 | Color(),AntiColor(),bindE(0.),formTime(0.) |
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107 | { |
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108 | G4int curPDG=valQ.GetSPDGCode(); |
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109 | if(curPDG==10&&valQ.GetBaryonNumber()>0) curPDG=valQ.GetZNSPDGCode(); |
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110 | if(curPDG&&curPDG!=10) theQPDG.SetPDGCode(curPDG); |
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111 | else theQPDG.InitByQCont(QC); |
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112 | } |
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113 | |
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114 | G4QHadron::G4QHadron(G4int PDGCode, G4double aMass, G4QContent QC) : |
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115 | theQPDG(PDGCode),theMomentum(0.,0.,0., aMass),valQ(QC),nFragm(0),thePosition(0.,0.,0.), |
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116 | theCollisionCount(0),isSplit(false),Direction(true),Color(),AntiColor(),bindE(0.), |
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117 | formTime(0.) |
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118 | {} |
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119 | |
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120 | G4QHadron::G4QHadron(G4QPDGCode QPDG, G4double aMass, G4QContent QC) : |
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121 | theQPDG(QPDG),theMomentum(0.,0.,0., aMass),valQ(QC),nFragm(0),thePosition(0.,0.,0.), |
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122 | theCollisionCount(0),isSplit(false),Direction(true),Color(),AntiColor(),bindE(0.), |
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123 | formTime(0.) |
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124 | {} |
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125 | |
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126 | G4QHadron::G4QHadron(G4int PDGCode, G4LorentzVector p, G4QContent QC) : |
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127 | theQPDG(PDGCode),theMomentum(p),valQ(QC),nFragm(0),thePosition(0.,0.,0.), |
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128 | theCollisionCount(0),isSplit(false),Direction(true),Color(),AntiColor(),bindE(0.), |
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129 | formTime(0.) |
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130 | {} |
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131 | |
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132 | G4QHadron::G4QHadron(G4QPDGCode QPDG, G4LorentzVector p, G4QContent QC) : |
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133 | theQPDG(QPDG),theMomentum(p),valQ(QC),nFragm(0),thePosition(0.,0.,0.), |
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134 | theCollisionCount(0),isSplit(false),Direction(true),Color(),AntiColor(),bindE(0.), |
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135 | formTime(0.) |
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136 | {} |
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137 | |
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138 | G4QHadron::G4QHadron(G4QParticle* pPart, G4double maxM) : |
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139 | theQPDG(pPart->GetQPDG()),theMomentum(0.,0.,0.,0.),nFragm(0),thePosition(0.,0.,0.), |
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140 | theCollisionCount(0),isSplit(false),Direction(true),Color(),AntiColor(),bindE(0.), |
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141 | formTime(0.) |
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142 | { |
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143 | #ifdef debug |
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144 | G4cout<<"G4QHadron is created & randomized with maxM="<<maxM<<G4endl; |
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145 | #endif |
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146 | G4int PDGCode = theQPDG.GetPDGCode(); |
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147 | if(PDGCode<2)G4cerr<<"***G4QHadron:(M) PDGC="<<PDGCode<<" use other constructor"<<G4endl; |
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148 | valQ=theQPDG.GetQuarkContent(); |
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149 | theMomentum.setE(RandomizeMass(pPart, maxM)); |
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150 | } |
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151 | |
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152 | G4QHadron::G4QHadron(const G4QHadron& right) |
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153 | { |
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154 | theMomentum = right.theMomentum; |
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155 | theQPDG = right.theQPDG; |
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156 | valQ = right.valQ; |
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157 | nFragm = right.nFragm; |
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158 | thePosition = right.thePosition; |
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159 | theCollisionCount = 0; |
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160 | isSplit = false; |
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161 | Direction = right.Direction; |
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162 | bindE = right.bindE; |
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163 | formTime = right.formTime; |
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164 | } |
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165 | |
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166 | G4QHadron::G4QHadron(const G4QHadron* right) |
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167 | { |
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168 | theMomentum = right->theMomentum; |
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169 | theQPDG = right->theQPDG; |
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170 | valQ = right->valQ; |
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171 | nFragm = right->nFragm; |
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172 | thePosition = right->thePosition; |
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173 | theCollisionCount = 0; |
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174 | isSplit = false; |
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175 | Direction = right->Direction; |
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176 | bindE = right->bindE; |
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177 | formTime = right->formTime; |
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178 | } |
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179 | |
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180 | G4QHadron::G4QHadron(const G4QHadron* right, G4int C, G4ThreeVector P, G4LorentzVector M) |
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181 | { |
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182 | theMomentum = M; |
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183 | theQPDG = right->theQPDG; |
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184 | valQ = right->valQ; |
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185 | nFragm = right->nFragm; |
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186 | thePosition = P; |
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187 | theCollisionCount = C; |
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188 | isSplit = false; |
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189 | Direction = right->Direction; |
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190 | bindE = right->bindE; |
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191 | formTime = right->formTime; |
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192 | } |
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193 | |
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194 | const G4QHadron& G4QHadron::operator=(const G4QHadron &right) |
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195 | { |
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196 | if(this != &right) // Beware of self assignment |
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197 | { |
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198 | theMomentum = right.theMomentum; |
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199 | theQPDG = right.theQPDG; |
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200 | valQ = right.valQ; |
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201 | nFragm = right.nFragm; |
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202 | thePosition = right.thePosition; |
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203 | theCollisionCount = 0; |
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204 | isSplit = false; |
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205 | Direction = right.Direction; |
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206 | bindE = right.bindE; |
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207 | } |
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208 | return *this; |
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209 | } |
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210 | |
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211 | G4QHadron::~G4QHadron() |
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212 | { |
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213 | std::list<G4QParton*>::iterator ipos = Color.begin(); |
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214 | std::list<G4QParton*>::iterator epos = Color.end(); |
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215 | for( ; ipos != epos; ipos++) {delete [] *ipos;} |
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216 | Color.clear(); |
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217 | |
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218 | ipos = AntiColor.begin(); |
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219 | epos = AntiColor.end(); |
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220 | for( ; ipos != epos; ipos++) {delete [] *ipos;} |
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221 | AntiColor.clear(); |
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222 | } |
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223 | |
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224 | // Define quark content of the particle with a particular PDG Code |
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225 | void G4QHadron::DefineQC(G4int PDGCode) |
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226 | { |
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227 | //G4cout<<"G4QHadron::DefineQC is called with PDGCode="<<PDGCode<<G4endl; |
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228 | G4int szn=PDGCode-90000000; |
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229 | G4int ds=0; |
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230 | G4int dz=0; |
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231 | G4int dn=0; |
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232 | if(szn<-100000) |
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233 | { |
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234 | G4int ns=(-szn)/1000000+1; |
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235 | szn+=ns*1000000; |
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236 | ds+=ns; |
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237 | } |
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238 | else if(szn<-100) |
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239 | { |
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240 | G4int nz=(-szn)/1000+1; |
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241 | szn+=nz*1000; |
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242 | dz+=nz; |
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243 | } |
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244 | else if(szn<0) |
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245 | { |
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246 | G4int nn=-szn; |
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247 | szn=0; |
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248 | dn+=nn; |
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249 | } |
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250 | G4int sz =szn/1000; |
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251 | G4int n =szn%1000; |
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252 | if(n>700) |
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253 | { |
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254 | n-=1000; |
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255 | dz--; |
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256 | } |
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257 | G4int z =sz%1000-dz; |
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258 | if(z>700) |
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259 | { |
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260 | z-=1000; |
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261 | ds--; |
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262 | } |
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263 | G4int Sq =sz/1000-ds; |
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264 | G4int zns=z+n+Sq; |
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265 | G4int Dq=n+zns; |
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266 | G4int Uq=z+zns; |
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267 | if (Dq<0&&Uq<0&&Sq<0)valQ=G4QContent(0 ,0 ,0 ,-Dq,-Uq,-Sq); |
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268 | else if (Uq<0&&Sq<0) valQ=G4QContent(Dq,0 ,0 ,0 ,-Uq,-Sq); |
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269 | else if (Dq<0&&Sq<0) valQ=G4QContent(0 ,Uq,0 ,-Dq,0 ,-Sq); |
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270 | else if (Dq<0&&Uq<0) valQ=G4QContent(0 ,0 ,Sq,-Dq,-Uq,0 ); |
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271 | else if (Uq<0) valQ=G4QContent(Dq,0 ,Sq,0 ,-Uq,0 ); |
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272 | else if (Sq<0) valQ=G4QContent(Dq,Uq,0 ,0 ,0 ,-Sq); |
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273 | else if (Dq<0) valQ=G4QContent(0 ,Uq,Sq,-Dq,0 ,0 ); |
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274 | else valQ=G4QContent(Dq,Uq,Sq,0 ,0 ,0 ); |
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275 | } |
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276 | |
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277 | // Redefine a Hadron with a new PDGCode |
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278 | void G4QHadron::SetQPDG(const G4QPDGCode& newQPDG) |
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279 | { |
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280 | theQPDG = newQPDG; |
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281 | G4int PDG= newQPDG.GetPDGCode(); |
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282 | G4int Q = newQPDG.GetQCode(); |
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283 | #ifdef debug |
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284 | G4cout<<"G4QHadron::SetQPDG is called with PDGCode="<<PDG<<", QCode="<<Q<<G4endl; |
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285 | #endif |
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286 | if (Q>-1) valQ=theQPDG.GetQuarkContent(); |
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287 | else if(PDG>80000000) DefineQC(PDG); |
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288 | else |
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289 | { |
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290 | G4cerr<<"***G4QHadron::SetQPDG: QPDG="<<newQPDG<<G4endl; |
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291 | throw G4QException("***G4QHadron::SetQPDG: Impossible QPDG Probably a Chipolino"); |
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292 | } |
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293 | } |
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294 | |
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295 | // Decay of Hadron In2Particles f&s, f is in respect to the direction of HadronMomentumDir |
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296 | G4bool G4QHadron::RelDecayIn2(G4LorentzVector& f4Mom, G4LorentzVector& s4Mom, |
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297 | G4LorentzVector& dir, G4double maxCost, G4double minCost) |
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298 | {// =================================================================== |
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299 | G4double fM2 = f4Mom.m2(); |
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300 | G4double fM = sqrt(fM2); // Mass of the 1st Hadron |
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301 | G4double sM2 = s4Mom.m2(); |
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302 | G4double sM = sqrt(sM2); // Mass of the 2nd Hadron |
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303 | G4double iM2 = theMomentum.m2(); |
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304 | G4double iM = sqrt(iM2); // Mass of the decaying hadron |
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305 | G4double vP = theMomentum.rho(); // Momentum of the decaying hadron |
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306 | G4double dE = theMomentum.e(); // Energy of the decaying hadron |
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307 | if(dE<vP) |
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308 | { |
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309 | G4cerr<<"***G4QHad::RelDecIn2: Tachionic 4-mom="<<theMomentum<<", E-p="<<dE-vP<<G4endl; |
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310 | G4double accuracy=.000001*vP; |
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311 | G4double emodif=std::fabs(dE-vP); |
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312 | //if(emodif<accuracy) |
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313 | //{ |
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314 | G4cerr<<"G4QHadron::RelDecIn2: *Boost* E-p shift is corrected to "<<emodif<<G4endl; |
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315 | theMomentum.setE(vP+emodif+.01*accuracy); |
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316 | //} |
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317 | } |
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318 | G4ThreeVector ltb = theMomentum.boostVector();// Boost vector for backward Lorentz Trans. |
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319 | G4ThreeVector ltf = -ltb; // Boost vector for forward Lorentz Trans. |
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320 | G4LorentzVector cdir = dir; // A copy to make a transformation to CMS |
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321 | #ifdef ppdebug |
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322 | if(cdir.e()+.001<cdir.rho()) G4cerr<<"*G4QH::RDIn2:*Boost* cd4M="<<cdir<<",e-p=" |
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323 | <<cdir.e()-cdir.rho()<<G4endl; |
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324 | #endif |
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325 | cdir.boost(ltf); // Direction transpormed to CMS of the Momentum |
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326 | G4ThreeVector vdir = cdir.vect(); // 3-Vector of the direction-particle |
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327 | #ifdef ppdebug |
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328 | G4cout<<"G4QHad::RelDI2:dir="<<dir<<",ltf="<<ltf<<",cdir="<<cdir<<",vdir="<<vdir<<G4endl; |
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329 | #endif |
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330 | G4ThreeVector vx(0.,0.,1.); // Ort in the direction of the reference particle |
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331 | G4ThreeVector vy(0.,1.,0.); // First ort orthogonal to the direction |
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332 | G4ThreeVector vz(1.,0.,0.); // Second ort orthoganal to the direction |
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333 | if(vdir.mag2() > 0.) // the refference particle isn't at rest in CMS |
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334 | { |
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335 | vx = vdir.unit(); // Ort in the direction of the reference particle |
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336 | #ifdef ppdebug |
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337 | G4cout<<"G4QH::RelDecIn2:Vx="<<vx<<",M="<<theMomentum<<",d="<<dir<<",c="<<cdir<<G4endl; |
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338 | #endif |
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339 | G4ThreeVector vv= vx.orthogonal(); // Not normed orthogonal vector (!) |
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340 | vy = vv.unit(); // First ort orthogonal to the direction |
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341 | vz = vx.cross(vy); // Second ort orthoganal to the direction |
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342 | } |
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343 | #ifdef ppdebug |
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344 | G4cout<<"G4QHad::RelDecIn2:iM="<<iM<<"=>fM="<<fM<<"+sM="<<sM<<",ob="<<vx<<vy<<vz<<G4endl; |
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345 | #endif |
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346 | if(maxCost> 1.) maxCost= 1.; |
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347 | if(minCost<-1.) minCost=-1.; |
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348 | if(maxCost<-1.) maxCost=-1.; |
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349 | if(minCost> 1.) minCost= 1.; |
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350 | if(minCost> maxCost) minCost=maxCost; |
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351 | if(fabs(iM-fM-sM)<.00000001) |
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352 | { |
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353 | G4double fR=fM/iM; |
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354 | G4double sR=sM/iM; |
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355 | f4Mom=fR*theMomentum; |
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356 | s4Mom=sR*theMomentum; |
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357 | return true; |
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358 | } |
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359 | else if (iM+.001<fM+sM || iM==0.) |
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360 | {//@@ Later on make a quark content check for the decay |
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361 | G4cerr<<"***G4QH::RelDecIn2: fM="<<fM<<"+sM="<<sM<<">iM="<<iM<<",d="<<iM-fM-sM<<G4endl; |
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362 | return false; |
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363 | } |
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364 | G4double d2 = iM2-fM2-sM2; |
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365 | G4double p2 = (d2*d2/4.-fM2*sM2)/iM2; // Decay momentum(^2) in CMS of Quasmon |
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366 | if(p2<0.) |
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367 | { |
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368 | #ifdef ppdebug |
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369 | G4cout<<"**G4QH:RDIn2:p2="<<p2<<"<0,d2^2="<<d2*d2/4.<<"<4*fM2*sM2="<<4*fM2*sM2<<G4endl; |
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370 | #endif |
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371 | p2=0.; |
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372 | } |
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373 | G4double p = sqrt(p2); |
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374 | G4double ct = maxCost; |
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375 | if(maxCost>minCost) |
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376 | { |
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377 | G4double dcost=maxCost-minCost; |
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378 | ct = minCost+dcost*G4UniformRand(); |
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379 | } |
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380 | G4double phi= twopi*G4UniformRand(); // @@ Change 360.*deg to M_TWOPI (?) |
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381 | G4double ps=0.; |
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382 | if(fabs(ct)<1.) ps = p * sqrt(1.-ct*ct); |
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383 | else |
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384 | { |
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385 | #ifdef ppdebug |
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386 | G4cout<<"**G4QH::RDIn2:ct="<<ct<<",mac="<<maxCost<<",mic="<<minCost<<G4endl; |
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387 | //throw G4QException("***G4QHadron::RDIn2: bad cos(theta)"); |
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388 | #endif |
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389 | if(ct>1.) ct=1.; |
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390 | if(ct<-1.) ct=-1.; |
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391 | } |
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392 | G4ThreeVector pVect=(ps*sin(phi))*vz+(ps*cos(phi))*vy+p*ct*vx; |
---|
393 | #ifdef ppdebug |
---|
394 | G4cout<<"G4QH::RelDIn2:ct="<<ct<<",p="<<p<<",ps="<<ps<<",ph="<<phi<<",v="<<pVect<<G4endl; |
---|
395 | #endif |
---|
396 | |
---|
397 | f4Mom.setVect(pVect); |
---|
398 | f4Mom.setE(sqrt(fM2+p2)); |
---|
399 | s4Mom.setVect((-1)*pVect); |
---|
400 | s4Mom.setE(sqrt(sM2+p2)); |
---|
401 | |
---|
402 | #ifdef ppdebug |
---|
403 | G4cout<<"G4QHadr::RelDecIn2:p2="<<p2<<",v="<<ltb<<",f4M="<<f4Mom<<" + s4M="<<s4Mom<<" = " |
---|
404 | <<f4Mom+s4Mom<<", M="<<iM<<G4endl; |
---|
405 | #endif |
---|
406 | if(f4Mom.e()+.001<f4Mom.rho())G4cerr<<"*G4QH::RDIn2:*Boost* f4M="<<f4Mom<<",e-p=" |
---|
407 | <<f4Mom.e()-f4Mom.rho()<<G4endl; |
---|
408 | f4Mom.boost(ltb); // Lor.Trans. of 1st hadron back to LS |
---|
409 | if(s4Mom.e()+.001<s4Mom.rho())G4cerr<<"*G4QH::RDIn2:*Boost* s4M="<<s4Mom<<",e-p=" |
---|
410 | <<s4Mom.e()-s4Mom.rho()<<G4endl; |
---|
411 | s4Mom.boost(ltb); // Lor.Trans. of 2nd hadron back to LS |
---|
412 | #ifdef ppdebug |
---|
413 | G4cout<<"G4QHadron::RelDecayIn2:Output, f4Mom="<<f4Mom<<" + s4Mom="<<s4Mom<<" = " |
---|
414 | <<f4Mom+s4Mom<<", d4M="<<theMomentum-f4Mom-s4Mom<<G4endl; |
---|
415 | #endif |
---|
416 | return true; |
---|
417 | } // End of "RelDecayIn2" |
---|
418 | |
---|
419 | // Decay of Hadron In2Particles f&s, f w/r/to dN/dO [cp>0: ~cost^cp, cp<0: ~(1-cost)^(-cp)] |
---|
420 | G4bool G4QHadron::CopDecayIn2(G4LorentzVector& f4Mom, G4LorentzVector& s4Mom, |
---|
421 | G4LorentzVector& dir, G4double cosp) |
---|
422 | {// =================================================================== |
---|
423 | G4double fM2 = f4Mom.m2(); |
---|
424 | G4double fM = sqrt(fM2); // Mass of the 1st Hadron |
---|
425 | G4double sM2 = s4Mom.m2(); |
---|
426 | G4double sM = sqrt(sM2); // Mass of the 2nd Hadron |
---|
427 | G4double iM2 = theMomentum.m2(); |
---|
428 | G4double iM = sqrt(iM2); // Mass of the decaying hadron |
---|
429 | G4double vP = theMomentum.rho(); // Momentum of the decaying hadron |
---|
430 | G4double dE = theMomentum.e(); // Energy of the decaying hadron |
---|
431 | G4bool neg=false; // Negative (backward) distribution of t |
---|
432 | if(cosp<0) |
---|
433 | { |
---|
434 | cosp=-cosp; |
---|
435 | neg=true; |
---|
436 | } |
---|
437 | if(dE<vP) |
---|
438 | { |
---|
439 | G4cerr<<"***G4QHad::CopDecIn2: Tachionic 4-mom="<<theMomentum<<", E-p="<<dE-vP<<G4endl; |
---|
440 | G4double accuracy=.000001*vP; |
---|
441 | G4double emodif=std::fabs(dE-vP); |
---|
442 | //if(emodif<accuracy) |
---|
443 | //{ |
---|
444 | G4cerr<<"G4QHadron::CopDecIn2: *Boost* E-p shift is corrected to "<<emodif<<G4endl; |
---|
445 | theMomentum.setE(vP+emodif+.01*accuracy); |
---|
446 | //} |
---|
447 | } |
---|
448 | G4ThreeVector ltb = theMomentum.boostVector();// Boost vector for backward Lorentz Trans. |
---|
449 | G4ThreeVector ltf = -ltb; // Boost vector for forward Lorentz Trans. |
---|
450 | G4LorentzVector cdir = dir; // A copy to make a transformation to CMS |
---|
451 | #ifdef ppdebug |
---|
452 | if(cdir.e()+.001<cdir.rho()) G4cerr<<"*G4QH::RDIn2:*Boost* cd4M="<<cdir<<",e-p=" |
---|
453 | <<cdir.e()-cdir.rho()<<G4endl; |
---|
454 | #endif |
---|
455 | cdir.boost(ltf); // Direction transpormed to CMS of the Momentum |
---|
456 | G4ThreeVector vdir = cdir.vect(); // 3-Vector of the direction-particle |
---|
457 | #ifdef ppdebug |
---|
458 | G4cout<<"G4QHad::CopDI2:dir="<<dir<<",ltf="<<ltf<<",cdir="<<cdir<<",vdir="<<vdir<<G4endl; |
---|
459 | #endif |
---|
460 | G4ThreeVector vx(0.,0.,1.); // Ort in the direction of the reference particle |
---|
461 | G4ThreeVector vy(0.,1.,0.); // First ort orthogonal to the direction |
---|
462 | G4ThreeVector vz(1.,0.,0.); // Second ort orthoganal to the direction |
---|
463 | if(vdir.mag2() > 0.) // the refference particle isn't at rest in CMS |
---|
464 | { |
---|
465 | vx = vdir.unit(); // Ort in the direction of the reference particle |
---|
466 | #ifdef ppdebug |
---|
467 | G4cout<<"G4QH::CopDecIn2:Vx="<<vx<<",M="<<theMomentum<<",d="<<dir<<",c="<<cdir<<G4endl; |
---|
468 | #endif |
---|
469 | G4ThreeVector vv= vx.orthogonal(); // Not normed orthogonal vector (!) |
---|
470 | vy = vv.unit(); // First ort orthogonal to the direction |
---|
471 | vz = vx.cross(vy); // Second ort orthoganal to the direction |
---|
472 | } |
---|
473 | #ifdef ppdebug |
---|
474 | G4cout<<"G4QHad::CopDecIn2:iM="<<iM<<"=>fM="<<fM<<"+sM="<<sM<<",ob="<<vx<<vy<<vz<<G4endl; |
---|
475 | #endif |
---|
476 | if(fabs(iM-fM-sM)<.00000001) |
---|
477 | { |
---|
478 | G4double fR=fM/iM; |
---|
479 | G4double sR=sM/iM; |
---|
480 | f4Mom=fR*theMomentum; |
---|
481 | s4Mom=sR*theMomentum; |
---|
482 | return true; |
---|
483 | } |
---|
484 | else if (iM+.001<fM+sM || iM==0.) |
---|
485 | {//@@ Later on make a quark content check for the decay |
---|
486 | G4cerr<<"***G4QH::CopDecIn2: fM="<<fM<<"+sM="<<sM<<">iM="<<iM<<",d="<<iM-fM-sM<<G4endl; |
---|
487 | return false; |
---|
488 | } |
---|
489 | G4double d2 = iM2-fM2-sM2; |
---|
490 | G4double p2 = (d2*d2/4.-fM2*sM2)/iM2; // Decay momentum(^2) in CMS of Quasmon |
---|
491 | if(p2<0.) |
---|
492 | { |
---|
493 | #ifdef ppdebug |
---|
494 | G4cout<<"*G4QH:CopDI2:p2="<<p2<<"<0,d4/4="<<d2*d2/4.<<"<4*fM2*sM2="<<4*fM2*sM2<<G4endl; |
---|
495 | #endif |
---|
496 | p2=0.; |
---|
497 | } |
---|
498 | G4double p = sqrt(p2); |
---|
499 | G4double ct = 0; |
---|
500 | G4double rn = pow(G4UniformRand(),cosp+1.); |
---|
501 | if(neg) ct = rn+rn-1.; // More backward than forward |
---|
502 | else ct = 1.-rn-rn; // More forward than backward |
---|
503 | // |
---|
504 | G4double phi= twopi*G4UniformRand(); // @@ Change 360.*deg to M_TWOPI (?) |
---|
505 | G4double ps=0.; |
---|
506 | if(fabs(ct)<1.) ps = p * sqrt(1.-ct*ct); |
---|
507 | else |
---|
508 | { |
---|
509 | #ifdef ppdebug |
---|
510 | G4cout<<"**G4QH::CopDecayIn2:ct="<<ct<<",mac="<<maxCost<<",mic="<<minCost<<G4endl; |
---|
511 | //throw G4QException("***G4QHadron::RDIn2: bad cos(theta)"); |
---|
512 | #endif |
---|
513 | if(ct>1.) ct=1.; |
---|
514 | if(ct<-1.) ct=-1.; |
---|
515 | } |
---|
516 | G4ThreeVector pVect=(ps*sin(phi))*vz+(ps*cos(phi))*vy+p*ct*vx; |
---|
517 | #ifdef ppdebug |
---|
518 | G4cout<<"G4QH::CopDIn2:ct="<<ct<<",p="<<p<<",ps="<<ps<<",ph="<<phi<<",v="<<pVect<<G4endl; |
---|
519 | #endif |
---|
520 | |
---|
521 | f4Mom.setVect(pVect); |
---|
522 | f4Mom.setE(sqrt(fM2+p2)); |
---|
523 | s4Mom.setVect((-1)*pVect); |
---|
524 | s4Mom.setE(sqrt(sM2+p2)); |
---|
525 | |
---|
526 | #ifdef ppdebug |
---|
527 | G4cout<<"G4QHadr::CopDecIn2:p2="<<p2<<",v="<<ltb<<",f4M="<<f4Mom<<" + s4M="<<s4Mom<<" = " |
---|
528 | <<f4Mom+s4Mom<<", M="<<iM<<G4endl; |
---|
529 | #endif |
---|
530 | if(f4Mom.e()+.001<f4Mom.rho())G4cerr<<"*G4QH::RDIn2:*Boost* f4M="<<f4Mom<<",e-p=" |
---|
531 | <<f4Mom.e()-f4Mom.rho()<<G4endl; |
---|
532 | f4Mom.boost(ltb); // Lor.Trans. of 1st hadron back to LS |
---|
533 | if(s4Mom.e()+.001<s4Mom.rho())G4cerr<<"*G4QH::RDIn2:*Boost* s4M="<<s4Mom<<",e-p=" |
---|
534 | <<s4Mom.e()-s4Mom.rho()<<G4endl; |
---|
535 | s4Mom.boost(ltb); // Lor.Trans. of 2nd hadron back to LS |
---|
536 | #ifdef ppdebug |
---|
537 | G4cout<<"G4QHadron::CopDecayIn2:Output, f4Mom="<<f4Mom<<" + s4Mom="<<s4Mom<<" = " |
---|
538 | <<f4Mom+s4Mom<<", d4M="<<theMomentum-f4Mom-s4Mom<<G4endl; |
---|
539 | #endif |
---|
540 | return true; |
---|
541 | } // End of "CopDecayIn2" |
---|
542 | |
---|
543 | // Decay of the Hadron in 2 particles (f + s) |
---|
544 | G4bool G4QHadron::DecayIn2(G4LorentzVector& f4Mom, G4LorentzVector& s4Mom) |
---|
545 | {// =================================================================== |
---|
546 | G4double fM2 = f4Mom.m2(); |
---|
547 | if(fM2<0.) fM2=0.; |
---|
548 | G4double fM = sqrt(fM2); // Mass of the 1st Hadron |
---|
549 | G4double sM2 = s4Mom.m2(); |
---|
550 | if(sM2<0.) sM2=0.; |
---|
551 | G4double sM = sqrt(sM2); // Mass of the 2nd Hadron |
---|
552 | G4double iM2 = theMomentum.m2(); |
---|
553 | if(iM2<0.) iM2=0.; |
---|
554 | G4double iM = sqrt(iM2); // Mass of the decaying hadron |
---|
555 | #ifdef debug |
---|
556 | G4cout<<"G4QHadron::DecIn2: iM="<<iM<<" => fM="<<fM<<" + sM="<<sM<<" = "<<fM+sM<<G4endl; |
---|
557 | #endif |
---|
558 | //@@ Later on make a quark content check for the decay |
---|
559 | if (fabs(iM-fM-sM)<.0000001) |
---|
560 | { |
---|
561 | G4double fR=fM/iM; |
---|
562 | G4double sR=sM/iM; |
---|
563 | f4Mom=fR*theMomentum; |
---|
564 | s4Mom=sR*theMomentum; |
---|
565 | return true; |
---|
566 | } |
---|
567 | else if (iM+.001<fM+sM || iM==0.) |
---|
568 | { |
---|
569 | #ifdef pdebug |
---|
570 | G4cerr<<"***G4QHadron::DecayIn2*** fM="<<fM<<" + sM="<<sM<<"="<<fM+sM<<" > iM="<<iM |
---|
571 | <<", d="<<iM-fM-sM<<G4endl; |
---|
572 | #endif |
---|
573 | return false; |
---|
574 | } |
---|
575 | |
---|
576 | G4double d2 = iM2-fM2-sM2; |
---|
577 | G4double p2 = (d2*d2/4.-fM2*sM2)/iM2; // Decay momentum(^2) in CMS of Quasmon |
---|
578 | if (p2<0.) |
---|
579 | { |
---|
580 | #ifdef debug |
---|
581 | G4cerr<<"***G4QH::DI2:p2="<<p2<<"<0,d2^2="<<d2*d2/4.<<"<4*fM2*sM2="<<4*fM2*sM2<<G4endl; |
---|
582 | #endif |
---|
583 | p2=0.; |
---|
584 | } |
---|
585 | G4double p = sqrt(p2); |
---|
586 | G4double ct = 1.-2*G4UniformRand(); |
---|
587 | #ifdef debug |
---|
588 | G4cout<<"G4QHadron::DecayIn2: ct="<<ct<<", p="<<p<<G4endl; |
---|
589 | #endif |
---|
590 | G4double phi= twopi*G4UniformRand(); // @@ Change 360.*deg to M_TWOPI (?) |
---|
591 | G4double ps = p * sqrt(1.-ct*ct); |
---|
592 | G4ThreeVector pVect(ps*sin(phi),ps*cos(phi),p*ct); |
---|
593 | |
---|
594 | f4Mom.setVect(pVect); |
---|
595 | f4Mom.setE(sqrt(fM2+p2)); |
---|
596 | s4Mom.setVect((-1)*pVect); |
---|
597 | s4Mom.setE(sqrt(sM2+p2)); |
---|
598 | |
---|
599 | if(theMomentum.e()<theMomentum.rho()) |
---|
600 | { |
---|
601 | G4cerr<<"*G4QH::DecIn2:*Boost* 4M="<<theMomentum<<",e-p=" |
---|
602 | <<theMomentum.e()-theMomentum.rho()<<G4endl; |
---|
603 | //throw G4QException("G4QHadron::DecayIn2: Decay of particle with zero mass") |
---|
604 | theMomentum.setE(1.0000001*theMomentum.rho()); |
---|
605 | } |
---|
606 | G4double vP = theMomentum.rho(); // Momentum of the decaying hadron |
---|
607 | G4double dE = theMomentum.e(); // Energy of the decaying hadron |
---|
608 | if(dE<vP) |
---|
609 | { |
---|
610 | G4cerr<<"***G4QHad::RelDecIn2: Tachionic 4-mom="<<theMomentum<<", E-p="<<dE-vP<<G4endl; |
---|
611 | G4double accuracy=.000001*vP; |
---|
612 | G4double emodif=std::fabs(dE-vP); |
---|
613 | if(emodif<accuracy) |
---|
614 | { |
---|
615 | G4cerr<<"G4QHadron::DecayIn2: *Boost* E-p shift is corrected to "<<emodif<<G4endl; |
---|
616 | theMomentum.setE(vP+emodif+.01*accuracy); |
---|
617 | } |
---|
618 | } |
---|
619 | G4ThreeVector ltb = theMomentum.boostVector(); // Boost vector for backward Lor.Trans. |
---|
620 | #ifdef pdebug |
---|
621 | G4cout<<"G4QHadron::DecIn2:LorTrans v="<<ltb<<",f4Mom="<<f4Mom<<",s4Mom="<<s4Mom<<G4endl; |
---|
622 | #endif |
---|
623 | if(f4Mom.e()+.001<f4Mom.rho())G4cerr<<"*G4QH::DecIn2:*Boost* f4M="<<f4Mom<<G4endl; |
---|
624 | f4Mom.boost(ltb); // Lor.Trans. of 1st hadron back to LS |
---|
625 | if(s4Mom.e()+.001<s4Mom.rho())G4cerr<<"*G4QH::DecIn2:*Boost* s4M="<<s4Mom<<G4endl; |
---|
626 | s4Mom.boost(ltb); // Lor.Trans. of 2nd hadron back to LS |
---|
627 | #ifdef pdebug |
---|
628 | G4cout<<"G4QHadron::DecayIn2: ROOT OUTPUT f4Mom="<<f4Mom<<", s4Mom="<<s4Mom<<G4endl; |
---|
629 | #endif |
---|
630 | return true; |
---|
631 | } // End of "DecayIn2" |
---|
632 | |
---|
633 | // Correction for the Hadron + fr decay in case of the new corM mass of the Hadron |
---|
634 | G4bool G4QHadron::CorMDecayIn2(G4double corM, G4LorentzVector& fr4Mom) |
---|
635 | {// =============================================================== |
---|
636 | G4double fM = fr4Mom.m(); // Mass of the Fragment |
---|
637 | G4LorentzVector comp=theMomentum+fr4Mom; // 4Mom of the decaying compound system |
---|
638 | G4double iM = comp.m(); // mass of the decaying compound system |
---|
639 | #ifdef pdebug |
---|
640 | G4cout<<"G4QH::CMDIn2: iM="<<iM<<comp<<"=>fM="<<fM<<"+corM="<<corM<<"="<<fM+corM<<G4endl; |
---|
641 | #endif |
---|
642 | G4double dE=iM-fM-corM; |
---|
643 | //@@ Later on make a quark content check for the decay |
---|
644 | if (fabs(dE)<.001) |
---|
645 | { |
---|
646 | G4double fR=fM/iM; |
---|
647 | G4double cR=corM/iM; |
---|
648 | fr4Mom=fR*comp; |
---|
649 | theMomentum=cR*comp; |
---|
650 | return true; |
---|
651 | } |
---|
652 | else if (dE<-.001 || iM==0.) |
---|
653 | { |
---|
654 | G4cerr<<"***G4QH::CorMDIn2***fM="<<fM<<" + cM="<<corM<<" > iM="<<iM<<",d="<<dE<<G4endl; |
---|
655 | return false; |
---|
656 | } |
---|
657 | G4double corM2= corM*corM; |
---|
658 | G4double fM2 = fM*fM; |
---|
659 | G4double iM2 = iM*iM; |
---|
660 | G4double d2 = iM2-fM2-corM2; |
---|
661 | G4double p2 = (d2*d2/4.-fM2*corM2)/iM2; // Decay momentum(^2) in CMS of Quasmon |
---|
662 | if (p2<0.) |
---|
663 | { |
---|
664 | #ifdef pdebug |
---|
665 | G4cerr<<"**G4QH::CMDI2:p2="<<p2<<"<0,d="<<d2*d2/4.<<"<4*fM2*hM2="<<4*fM2*corM2<<G4endl; |
---|
666 | #endif |
---|
667 | p2=0.; |
---|
668 | } |
---|
669 | G4double p = sqrt(p2); |
---|
670 | if(comp.e()<comp.rho())G4cerr<<"*G4QH::CorMDecayIn2:*Boost* comp4M="<<comp<<",e-p=" |
---|
671 | <<comp.e()-comp.rho()<<G4endl; |
---|
672 | G4ThreeVector ltb = comp.boostVector(); // Boost vector for backward Lor.Trans. |
---|
673 | G4ThreeVector ltf = -ltb; // Boost vector for forward Lorentz Trans. |
---|
674 | G4LorentzVector cm4Mom=fr4Mom; // Copy of fragment 4Mom to transform to CMS |
---|
675 | if(cm4Mom.e()<cm4Mom.rho()) |
---|
676 | { |
---|
677 | G4cerr<<"*G4QH::CorMDecIn2:*Boost* c4M="<<cm4Mom<<G4endl; |
---|
678 | cm4Mom.setE(1.0000001*cm4Mom.rho()); |
---|
679 | } |
---|
680 | cm4Mom.boost(ltf); // Now it is in CMS (Forward Lor.Trans.) |
---|
681 | G4double pfx= cm4Mom.px(); |
---|
682 | G4double pfy= cm4Mom.py(); |
---|
683 | G4double pfz= cm4Mom.pz(); |
---|
684 | G4double pt2= pfx*pfx+pfy*pfy; |
---|
685 | G4double tx=0.; |
---|
686 | G4double ty=0.; |
---|
687 | if(pt2<=0.) |
---|
688 | { |
---|
689 | G4double phi= 360.*deg*G4UniformRand(); // @@ Change 360.*deg to M_TWOPI (?) |
---|
690 | tx=sin(phi); |
---|
691 | ty=cos(phi); |
---|
692 | } |
---|
693 | else |
---|
694 | { |
---|
695 | G4double pt=sqrt(pt2); |
---|
696 | tx=pfx/pt; |
---|
697 | ty=pfy/pt; |
---|
698 | } |
---|
699 | G4double pc2=pt2+pfz*pfz; |
---|
700 | G4double ct=0.; |
---|
701 | if(pc2<=0.) |
---|
702 | { |
---|
703 | G4double rnd= G4UniformRand(); |
---|
704 | ct=1.-rnd-rnd; |
---|
705 | } |
---|
706 | else |
---|
707 | { |
---|
708 | G4double pc=sqrt(pc2); |
---|
709 | ct=pfz/pc; |
---|
710 | } |
---|
711 | #ifdef debug |
---|
712 | G4cout<<"G4QHadron::CorMDecayIn2: ct="<<ct<<", p="<<p<<G4endl; |
---|
713 | #endif |
---|
714 | G4double ps = p * sqrt(1.-ct*ct); |
---|
715 | G4ThreeVector pVect(ps*tx,ps*ty,p*ct); |
---|
716 | fr4Mom.setVect(pVect); |
---|
717 | fr4Mom.setE(sqrt(fM2+p2)); |
---|
718 | theMomentum.setVect((-1)*pVect); |
---|
719 | theMomentum.setE(sqrt(corM2+p2)); |
---|
720 | #ifdef pdebug |
---|
721 | G4LorentzVector dif2=comp-fr4Mom-theMomentum; |
---|
722 | G4cout<<"G4QH::CorMDIn2:c="<<comp<<"-f="<<fr4Mom<<"-4M="<<theMomentum<<"="<<dif2<<G4endl; |
---|
723 | #endif |
---|
724 | if(fr4Mom.e()+.001<fr4Mom.rho())G4cerr<<"*G4QH::CorMDecIn2:*Boost*fr4M="<<fr4Mom<<G4endl; |
---|
725 | fr4Mom.boost(ltb); // Lor.Trans. of the Fragment back to LS |
---|
726 | if(theMomentum.e()<theMomentum.rho()) |
---|
727 | { |
---|
728 | G4cerr<<"*G4QH::CMDI2:4="<<theMomentum<<G4endl; |
---|
729 | theMomentum.setE(1.0000001*theMomentum.rho()); |
---|
730 | } |
---|
731 | theMomentum.boost(ltb); // Lor.Trans. of the Hadron back to LS |
---|
732 | #ifdef pdebug |
---|
733 | G4LorentzVector dif3=comp-fr4Mom-theMomentum; |
---|
734 | G4cout<<"G4QH::CorMDecIn2:OUTPUT:f4M="<<fr4Mom<<",h4M="<<theMomentum<<"d="<<dif3<<G4endl; |
---|
735 | #endif |
---|
736 | return true; |
---|
737 | } // End of "CorMDecayIn2" |
---|
738 | |
---|
739 | |
---|
740 | // Fragment fr4Mom louse energy corE and transfer it to This Hadron |
---|
741 | G4bool G4QHadron::CorEDecayIn2(G4double corE, G4LorentzVector& fr4Mom) |
---|
742 | {// =============================================================== |
---|
743 | G4double fE = fr4Mom.m(); // Energy of the Fragment |
---|
744 | #ifdef pdebug |
---|
745 | G4cout<<"G4QH::CorEDecIn2:fE="<<fE<<fr4Mom<<">corE="<<corE<<",h4M="<<theMomentum<<G4endl; |
---|
746 | #endif |
---|
747 | if (fE+.001<=corE) |
---|
748 | { |
---|
749 | #ifdef pdebug |
---|
750 | G4cerr<<"***G4QHadron::CorEDecIn2*** fE="<<fE<<"<corE="<<corE<<", d="<<corE-fE<<G4endl; |
---|
751 | #endif |
---|
752 | return false; |
---|
753 | } |
---|
754 | G4double fM2=fr4Mom.m2(); // Squared Mass of the Fragment |
---|
755 | if(fM2<0.) fM2=0.; |
---|
756 | G4double iPx=fr4Mom.px(); // Initial Px of the Fragment |
---|
757 | G4double iPy=fr4Mom.py(); // Initial Py of the Fragment |
---|
758 | G4double iPz=fr4Mom.pz(); // Initial Pz of the Fragment |
---|
759 | G4double fP2=iPx*iPx+iPy*iPy+iPz*iPz; // Initial Squared 3-momentum of the Fragment |
---|
760 | G4double finE = fE - corE; // Final energy of the fragment |
---|
761 | G4double rP = sqrt((finE*finE-fM2)/fP2); // Reduction factor for the momentum |
---|
762 | G4double fPx=iPx*rP; |
---|
763 | G4double fPy=iPy*rP; |
---|
764 | G4double fPz=iPz*rP; |
---|
765 | fr4Mom= G4LorentzVector(fPx,fPy,fPz,finE); |
---|
766 | G4double Px=theMomentum.px()+iPx-fPx; |
---|
767 | G4double Py=theMomentum.py()+iPy-fPy; |
---|
768 | G4double Pz=theMomentum.pz()+iPz-fPz; |
---|
769 | G4double mE=theMomentum.e(); |
---|
770 | ///////////G4double mM2=theMomentum.m2(); |
---|
771 | theMomentum= G4LorentzVector(Px,Py,Pz,mE+corE); |
---|
772 | #ifdef pdebug |
---|
773 | G4double difF=fr4Mom.m2()-fM2; |
---|
774 | G4cout<<"G4QH::CorEDecIn2: dF="<<difF<<",out:"<<theMomentum<<fr4Mom<<G4endl; |
---|
775 | #endif |
---|
776 | return true; |
---|
777 | } // End of "CorEDecayIn2" |
---|
778 | |
---|
779 | // Decay of the hadron in 3 particles i=>r+s+t |
---|
780 | G4bool G4QHadron::DecayIn3 |
---|
781 | (G4LorentzVector& f4Mom, G4LorentzVector& s4Mom, G4LorentzVector& t4Mom) |
---|
782 | {// ==================================================================================== |
---|
783 | #ifdef debug |
---|
784 | G4cout<<"G4QH::DIn3:"<<theMomentum<<"=>pf="<<f4Mom<<"+ps="<<s4Mom<<"+pt="<<t4Mom<<G4endl; |
---|
785 | #endif |
---|
786 | G4double iM = theMomentum.m(); // Mass of the decaying hadron |
---|
787 | G4double fM = f4Mom.m(); // Mass of the 1st hadron |
---|
788 | G4double sM = s4Mom.m(); // Mass of the 2nd hadron |
---|
789 | G4double tM = t4Mom.m(); // Mass of the 3rd hadron |
---|
790 | G4double eps = 0.001; // Accuracy of the split condition |
---|
791 | if (fabs(iM-fM-sM-tM)<=eps) |
---|
792 | { |
---|
793 | G4double fR=fM/iM; |
---|
794 | G4double sR=sM/iM; |
---|
795 | G4double tR=tM/iM; |
---|
796 | f4Mom=fR*theMomentum; |
---|
797 | s4Mom=sR*theMomentum; |
---|
798 | t4Mom=tR*theMomentum; |
---|
799 | return true; |
---|
800 | } |
---|
801 | if (iM+eps<fM+sM+tM) |
---|
802 | { |
---|
803 | G4cout<<"***G4QHadron::DecayIn3:fM="<<fM<<" + sM="<<sM<<" + tM="<<tM<<" > iM="<<iM |
---|
804 | <<",d="<<iM-fM-sM-tM<<G4endl; |
---|
805 | return false; |
---|
806 | } |
---|
807 | G4double fM2 = fM*fM; |
---|
808 | G4double sM2 = sM*sM; |
---|
809 | G4double tM2 = tM*tM; |
---|
810 | G4double iM2 = iM*iM; |
---|
811 | G4double m13sBase=(iM-sM)*(iM-sM)-(fM+tM)*(fM+tM); |
---|
812 | G4double m12sMin =(fM+sM)*(fM+sM); |
---|
813 | G4double m12sBase=(iM-tM)*(iM-tM)-m12sMin; |
---|
814 | G4double rR = 0.; |
---|
815 | G4double rnd= 1.; |
---|
816 | #ifdef debug |
---|
817 | G4int tr = 0; //@@ Comment if "cout" below is skiped @@ |
---|
818 | #endif |
---|
819 | G4double m12s = 0.; // Fake definition before the Loop |
---|
820 | while (rnd > rR) |
---|
821 | { |
---|
822 | m12s = m12sMin + m12sBase*G4UniformRand(); |
---|
823 | G4double e1=m12s+fM2-sM2; |
---|
824 | G4double e2=iM2-m12s-tM2; |
---|
825 | G4double four12=4*m12s; |
---|
826 | G4double m13sRange=0.; |
---|
827 | G4double dif=(e1*e1-four12*fM2)*(e2*e2-four12*tM2); |
---|
828 | if(dif<0.) |
---|
829 | { |
---|
830 | #ifdef debug |
---|
831 | if(dif<-.01) G4cerr<<"*G4QHadron::DecayIn3:iM="<<iM<<",tM="<<tM<<",sM="<<sM<<",fM=" |
---|
832 | <<fM<<",m12(s+f)="<<sqrt(m12s)<<", d="<<iM-fM-sM-tM<<G4endl; |
---|
833 | #endif |
---|
834 | } |
---|
835 | else m13sRange=sqrt(dif)/m12s; |
---|
836 | rR = m13sRange/m13sBase; |
---|
837 | rnd= G4UniformRand(); |
---|
838 | #ifdef debug |
---|
839 | G4cout<<"G4QHadron::DecayIn3: try to decay #"<<++tr<<", rR="<<rR<<",rnd="<<rnd<<G4endl; |
---|
840 | #endif |
---|
841 | } |
---|
842 | G4double m12 = sqrt(m12s); // Mass of the H1+H2 system |
---|
843 | G4LorentzVector dh4Mom(0.,0.,0.,m12); |
---|
844 | |
---|
845 | if(!DecayIn2(t4Mom,dh4Mom)) |
---|
846 | { |
---|
847 | G4cerr<<"***G4QHadron::DecayIn3: Exception1"<<G4endl; |
---|
848 | //throw G4QException("G4QHadron::DecayIn3(): DecayIn2 did not succeed"); |
---|
849 | return false; |
---|
850 | } |
---|
851 | #ifdef debug |
---|
852 | G4cout<<"G4QHadron::DecayIn3: Now the last decay of m12="<<dh4Mom.m()<<G4endl; |
---|
853 | #endif |
---|
854 | if(!G4QHadron(dh4Mom).DecayIn2(f4Mom,s4Mom)) |
---|
855 | { |
---|
856 | G4cerr<<"***G4QHadron::DecayIn3: Error in DecayIn2 -> Exception2"<<G4endl; |
---|
857 | //throw G4QException("G4QHadron::DecayIn3(): DecayIn2 did not succeed"); |
---|
858 | return false; |
---|
859 | } |
---|
860 | return true; |
---|
861 | } // End of DecayIn3 |
---|
862 | |
---|
863 | // Relative Decay of the hadron in 3 particles i=>f+s+t (t is with respect to minC<ct<maxC) |
---|
864 | G4bool G4QHadron::RelDecayIn3(G4LorentzVector& f4Mom, G4LorentzVector& s4Mom, |
---|
865 | G4LorentzVector& t4Mom, G4LorentzVector& dir, |
---|
866 | G4double maxCost, G4double minCost) |
---|
867 | {// ==================================================================================== |
---|
868 | #ifdef debug |
---|
869 | G4cout<<"G4QH::RelDIn3:"<<theMomentum<<"=>f="<<f4Mom<<"+s="<<s4Mom<<"+t="<<t4Mom<<G4endl; |
---|
870 | #endif |
---|
871 | G4double iM = theMomentum.m(); // Mass of the decaying hadron |
---|
872 | G4double fM = f4Mom.m(); // Mass of the 1st hadron |
---|
873 | G4double sM = s4Mom.m(); // Mass of the 2nd hadron |
---|
874 | G4double tM = t4Mom.m(); // Mass of the 3rd hadron |
---|
875 | G4double eps = 0.001; // Accuracy of the split condition |
---|
876 | if (fabs(iM-fM-sM-tM)<=eps) |
---|
877 | { |
---|
878 | G4double fR=fM/iM; |
---|
879 | G4double sR=sM/iM; |
---|
880 | G4double tR=tM/iM; |
---|
881 | f4Mom=fR*theMomentum; |
---|
882 | s4Mom=sR*theMomentum; |
---|
883 | t4Mom=tR*theMomentum; |
---|
884 | return true; |
---|
885 | } |
---|
886 | if (iM+eps<fM+sM+tM) |
---|
887 | { |
---|
888 | G4cout<<"***G4QHadron::RelDecayIn3:fM="<<fM<<" + sM="<<sM<<" + tM="<<tM<<" > iM="<<iM |
---|
889 | <<",d="<<iM-fM-sM-tM<<G4endl; |
---|
890 | return false; |
---|
891 | } |
---|
892 | G4double fM2 = fM*fM; |
---|
893 | G4double sM2 = sM*sM; |
---|
894 | G4double tM2 = tM*tM; |
---|
895 | G4double iM2 = iM*iM; |
---|
896 | G4double m13sBase=(iM-sM)*(iM-sM)-(fM+tM)*(fM+tM); |
---|
897 | G4double m12sMin =(fM+sM)*(fM+sM); |
---|
898 | G4double m12sBase=(iM-tM)*(iM-tM)-m12sMin; |
---|
899 | G4double rR = 0.; |
---|
900 | G4double rnd= 1.; |
---|
901 | #ifdef debug |
---|
902 | G4int tr = 0; //@@ Comment if "cout" below is skiped @@ |
---|
903 | #endif |
---|
904 | G4double m12s = 0.; // Fake definition before the Loop |
---|
905 | while (rnd > rR) |
---|
906 | { |
---|
907 | m12s = m12sMin + m12sBase*G4UniformRand(); |
---|
908 | G4double e1=m12s+fM2-sM2; |
---|
909 | G4double e2=iM2-m12s-tM2; |
---|
910 | G4double four12=4*m12s; |
---|
911 | G4double m13sRange=0.; |
---|
912 | G4double dif=(e1*e1-four12*fM2)*(e2*e2-four12*tM2); |
---|
913 | if(dif<0.) |
---|
914 | { |
---|
915 | #ifdef debug |
---|
916 | if(dif<-.01) G4cerr<<"G4QHadron::RelDecayIn3:iM="<<iM<<",tM="<<tM<<",sM="<<sM<<",fM=" |
---|
917 | <<fM<<",m12(s+f)="<<sqrt(m12s)<<", d="<<iM-fM-sM-tM<<G4endl; |
---|
918 | #endif |
---|
919 | } |
---|
920 | else m13sRange=sqrt(dif)/m12s; |
---|
921 | rR = m13sRange/m13sBase; |
---|
922 | rnd= G4UniformRand(); |
---|
923 | #ifdef debug |
---|
924 | G4cout<<"G4QHadron::RelDecayIn3: try decay #"<<++tr<<", rR="<<rR<<",rnd="<<rnd<<G4endl; |
---|
925 | #endif |
---|
926 | } |
---|
927 | G4double m12 = sqrt(m12s); // Mass of the H1+H2 system |
---|
928 | G4LorentzVector dh4Mom(0.,0.,0.,m12); |
---|
929 | |
---|
930 | if(!RelDecayIn2(t4Mom,dh4Mom,dir,maxCost,minCost)) |
---|
931 | { |
---|
932 | G4cerr<<"***G4QHadron::RelDecayIn3: Exception1"<<G4endl; |
---|
933 | //throw G4QException("G4QHadron::DecayIn3(): DecayIn2 did not succeed"); |
---|
934 | return false; |
---|
935 | } |
---|
936 | #ifdef debug |
---|
937 | G4cout<<"G4QHadron::RelDecayIn3: Now the last decay of m12="<<dh4Mom.m()<<G4endl; |
---|
938 | #endif |
---|
939 | if(!G4QHadron(dh4Mom).DecayIn2(f4Mom,s4Mom)) |
---|
940 | { |
---|
941 | G4cerr<<"***G4QHadron::RelDecayIn3: Error in DecayIn2 -> Exception2"<<G4endl; |
---|
942 | //throw G4QException("G4QHadron::DecayIn3(): DecayIn2 did not succeed"); |
---|
943 | return false; |
---|
944 | } |
---|
945 | return true; |
---|
946 | } // End of RelDecayIn3 |
---|
947 | |
---|
948 | // Relative Decay of hadron in 3: i=>f+s+t. dN/dO [cp>0:~cost^cp, cp<0:~(1-cost)^(-cp)] |
---|
949 | G4bool G4QHadron::CopDecayIn3(G4LorentzVector& f4Mom, G4LorentzVector& s4Mom, |
---|
950 | G4LorentzVector& t4Mom, G4LorentzVector& dir, G4double cosp) |
---|
951 | {// ==================================================================================== |
---|
952 | #ifdef debug |
---|
953 | G4cout<<"G4QH::CopDIn3:"<<theMomentum<<"=>f="<<f4Mom<<"+s="<<s4Mom<<"+t="<<t4Mom<<G4endl; |
---|
954 | #endif |
---|
955 | G4double iM = theMomentum.m(); // Mass of the decaying hadron |
---|
956 | G4double fM = f4Mom.m(); // Mass of the 1st hadron |
---|
957 | G4double sM = s4Mom.m(); // Mass of the 2nd hadron |
---|
958 | G4double tM = t4Mom.m(); // Mass of the 3rd hadron |
---|
959 | G4double eps = 0.001; // Accuracy of the split condition |
---|
960 | if (fabs(iM-fM-sM-tM)<=eps) |
---|
961 | { |
---|
962 | G4double fR=fM/iM; |
---|
963 | G4double sR=sM/iM; |
---|
964 | G4double tR=tM/iM; |
---|
965 | f4Mom=fR*theMomentum; |
---|
966 | s4Mom=sR*theMomentum; |
---|
967 | t4Mom=tR*theMomentum; |
---|
968 | return true; |
---|
969 | } |
---|
970 | if (iM+eps<fM+sM+tM) |
---|
971 | { |
---|
972 | G4cout<<"***G4QHadron::CopDecayIn3:fM="<<fM<<" + sM="<<sM<<" + tM="<<tM<<" > iM="<<iM |
---|
973 | <<",d="<<iM-fM-sM-tM<<G4endl; |
---|
974 | return false; |
---|
975 | } |
---|
976 | G4double fM2 = fM*fM; |
---|
977 | G4double sM2 = sM*sM; |
---|
978 | G4double tM2 = tM*tM; |
---|
979 | G4double iM2 = iM*iM; |
---|
980 | G4double m13sBase=(iM-sM)*(iM-sM)-(fM+tM)*(fM+tM); |
---|
981 | G4double m12sMin =(fM+sM)*(fM+sM); |
---|
982 | G4double m12sBase=(iM-tM)*(iM-tM)-m12sMin; |
---|
983 | G4double rR = 0.; |
---|
984 | G4double rnd= 1.; |
---|
985 | #ifdef debug |
---|
986 | G4int tr = 0; //@@ Comment if "cout" below is skiped @@ |
---|
987 | #endif |
---|
988 | G4double m12s = 0.; // Fake definition before the Loop |
---|
989 | while (rnd > rR) |
---|
990 | { |
---|
991 | m12s = m12sMin + m12sBase*G4UniformRand(); |
---|
992 | G4double e1=m12s+fM2-sM2; |
---|
993 | G4double e2=iM2-m12s-tM2; |
---|
994 | G4double four12=4*m12s; |
---|
995 | G4double m13sRange=0.; |
---|
996 | G4double dif=(e1*e1-four12*fM2)*(e2*e2-four12*tM2); |
---|
997 | if(dif<0.) |
---|
998 | { |
---|
999 | #ifdef debug |
---|
1000 | if(dif<-.01) G4cerr<<"G4QHadron::CopDecayIn3:iM="<<iM<<",tM="<<tM<<",sM="<<sM<<",fM=" |
---|
1001 | <<fM<<",m12(s+f)="<<sqrt(m12s)<<", d="<<iM-fM-sM-tM<<G4endl; |
---|
1002 | #endif |
---|
1003 | } |
---|
1004 | else m13sRange=sqrt(dif)/m12s; |
---|
1005 | rR = m13sRange/m13sBase; |
---|
1006 | rnd= G4UniformRand(); |
---|
1007 | #ifdef debug |
---|
1008 | G4cout<<"G4QHadron::CopDecayIn3: try decay #"<<++tr<<", rR="<<rR<<",rnd="<<rnd<<G4endl; |
---|
1009 | #endif |
---|
1010 | } |
---|
1011 | G4double m12 = sqrt(m12s); // Mass of the H1+H2 system |
---|
1012 | G4LorentzVector dh4Mom(0.,0.,0.,m12); |
---|
1013 | |
---|
1014 | if(!CopDecayIn2(t4Mom,dh4Mom,dir,cosp)) |
---|
1015 | { |
---|
1016 | G4cerr<<"***G4QHadron::CopDecayIn3: Exception1"<<G4endl; |
---|
1017 | //throw G4QException("G4QHadron::DecayIn3(): DecayIn2 did not succeed"); |
---|
1018 | return false; |
---|
1019 | } |
---|
1020 | #ifdef debug |
---|
1021 | G4cout<<"G4QHadron::DecayIn3: Now the last decay of m12="<<dh4Mom.m()<<G4endl; |
---|
1022 | #endif |
---|
1023 | if(!G4QHadron(dh4Mom).DecayIn2(f4Mom,s4Mom)) |
---|
1024 | { |
---|
1025 | G4cerr<<"***G4QHadron::CopDecayIn3: Error in DecayIn2 -> Exception2"<<G4endl; |
---|
1026 | //throw G4QException("G4QHadron::DecayIn3(): DecayIn2 did not succeed"); |
---|
1027 | return false; |
---|
1028 | } |
---|
1029 | return true; |
---|
1030 | } // End of CopDecayIn3 |
---|
1031 | |
---|
1032 | // Randomize particle mass taking into account the width |
---|
1033 | G4double G4QHadron::RandomizeMass(G4QParticle* pPart, G4double maxM) |
---|
1034 | // =========================================================== |
---|
1035 | { |
---|
1036 | G4double meanM = theQPDG.GetMass(); |
---|
1037 | G4double width = theQPDG.GetWidth()/2.; |
---|
1038 | #ifdef debug |
---|
1039 | G4cout<<"G4QHadron::RandomizeMass: meanM="<<meanM<<", halfWidth="<<width<<G4endl; |
---|
1040 | #endif |
---|
1041 | if(maxM<meanM-3*width) |
---|
1042 | { |
---|
1043 | #ifdef debug |
---|
1044 | G4cout<<"***G4QH::RandM:m=0 maxM="<<maxM<<"<meanM="<<meanM<<"-3*halfW="<<width<<G4endl; |
---|
1045 | #endif |
---|
1046 | return 0.; |
---|
1047 | } |
---|
1048 | ///////////////G4double theMass = 0.; |
---|
1049 | if(width==0.) |
---|
1050 | { |
---|
1051 | #ifdef debug |
---|
1052 | if(meanM>maxM) G4cerr<<"***G4QHadron::RandM:Stable m="<<meanM<<">maxM="<<maxM<<G4endl; |
---|
1053 | #endif |
---|
1054 | return meanM; |
---|
1055 | //return 0.; |
---|
1056 | } |
---|
1057 | else if(width<0.) |
---|
1058 | { |
---|
1059 | G4cerr<<"***G4QHadron::RandM: width="<<width<<"<0,PDGC="<<theQPDG.GetPDGCode()<<G4endl; |
---|
1060 | throw G4QException("G4QHadron::RandomizeMass: with the width of the Hadron < 0."); |
---|
1061 | } |
---|
1062 | G4double minM = pPart->MinMassOfFragm(); |
---|
1063 | if(minM>maxM) |
---|
1064 | { |
---|
1065 | #ifdef debug |
---|
1066 | G4cout<<"***G4QHadron::RandomizeMass:for PDG="<<theQPDG.GetPDGCode()<<" minM="<<minM |
---|
1067 | <<" > maxM="<<maxM<<G4endl; |
---|
1068 | #endif |
---|
1069 | return 0.; |
---|
1070 | } |
---|
1071 | //Now calculate the Breit-Wigner distribution with two cuts |
---|
1072 | G4double v1=atan((minM-meanM)/width); |
---|
1073 | G4double v2=atan((maxM-meanM)/width); |
---|
1074 | G4double dv=v2-v1; |
---|
1075 | #ifdef debug |
---|
1076 | G4cout<<"G4QHadr::RandM:Mi="<<minM<<",i="<<v1<<",Ma="<<maxM<<",a="<<v2<<","<<dv<<G4endl; |
---|
1077 | #endif |
---|
1078 | return meanM+width*tan(v1+dv*G4UniformRand()); |
---|
1079 | } |
---|
1080 | |
---|
1081 | // Split hadron in partons |
---|
1082 | void G4QHadron::SplitUp() |
---|
1083 | { |
---|
1084 | if (IsSplit()) return; |
---|
1085 | Splitting(); |
---|
1086 | if (Color.empty()) return; |
---|
1087 | if (GetSoftCollisionCount() == 0) |
---|
1088 | { |
---|
1089 | // Diffractive splitting: take the particle definition and get the partons |
---|
1090 | G4QParton* Left = 0; |
---|
1091 | G4QParton* Right = 0; |
---|
1092 | GetValenceQuarkFlavors(Left, Right); |
---|
1093 | Left->SetPosition(GetPosition()); |
---|
1094 | Right->SetPosition(GetPosition()); |
---|
1095 | |
---|
1096 | G4LorentzVector HadronMom = Get4Momentum(); |
---|
1097 | //G4cout<<"DSU 1 - "<<HadronMom<<G4endl; |
---|
1098 | |
---|
1099 | // momenta of string ends |
---|
1100 | G4double pt2 = HadronMom.perp2(); |
---|
1101 | G4double transverseMass2 = HadronMom.plus()*HadronMom.minus(); |
---|
1102 | G4double maxAvailMomentum2 = sqr(std::sqrt(transverseMass2) - std::sqrt(pt2)); |
---|
1103 | G4ThreeVector pt(minTransverseMass, minTransverseMass, 0); |
---|
1104 | if(maxAvailMomentum2/widthOfPtSquare>0.01) |
---|
1105 | pt=GaussianPt(widthOfPtSquare, maxAvailMomentum2); |
---|
1106 | //G4cout<<"DSU 1.1 - "<<maxAvailMomentum2<<", pt="<<pt<<G4endl; |
---|
1107 | |
---|
1108 | G4LorentzVector LeftMom(pt, 0.); |
---|
1109 | G4LorentzVector RightMom; |
---|
1110 | RightMom.setPx(HadronMom.px() - pt.x()); |
---|
1111 | RightMom.setPy(HadronMom.py() - pt.y()); |
---|
1112 | //G4cout<<"DSU 2: Right4M="<<RightMom<<", Left4M= "<<LeftMom<<G4endl; |
---|
1113 | |
---|
1114 | G4double Local1 = HadronMom.minus() + |
---|
1115 | (RightMom.perp2() - LeftMom.perp2()) / HadronMom.plus(); |
---|
1116 | G4double Local2 = std::sqrt(std::max(0., Local1*Local1 - |
---|
1117 | 4*RightMom.perp2()*HadronMom.minus() / HadronMom.plus())); |
---|
1118 | //G4cout<<"DSU 3: L1="<< Local1 <<", L2="<<Local2<<G4endl; |
---|
1119 | |
---|
1120 | if (Direction) Local2 = -Local2; |
---|
1121 | G4double RightMinus = 0.5*(Local1 + Local2); |
---|
1122 | G4double LeftMinus = HadronMom.minus() - RightMinus; |
---|
1123 | //G4cout<<"DSU 4: Rm="<<RightMinus<<", Lm="<<LeftMinus<<" "<<HadronMom.minus()<<G4endl; |
---|
1124 | |
---|
1125 | G4double LeftPlus = LeftMom.perp2()/LeftMinus; |
---|
1126 | G4double RightPlus = HadronMom.plus() - LeftPlus; |
---|
1127 | //G4cout<<"DSU 5: Rp="<<RightPlus<<", Lp="<<LeftPlus<<G4endl; |
---|
1128 | LeftMom.setPz(0.5*(LeftPlus - LeftMinus)); |
---|
1129 | LeftMom.setE (0.5*(LeftPlus + LeftMinus)); |
---|
1130 | RightMom.setPz(0.5*(RightPlus - RightMinus)); |
---|
1131 | RightMom.setE (0.5*(RightPlus + RightMinus)); |
---|
1132 | //G4cout<<"DSU 6: Left4M="<<LeftMom<<", Right4M="<<RightMom<<G4endl; |
---|
1133 | Left->Set4Momentum(LeftMom); |
---|
1134 | Right->Set4Momentum(RightMom); |
---|
1135 | Color.push_back(Left); |
---|
1136 | AntiColor.push_back(Right); |
---|
1137 | } |
---|
1138 | else |
---|
1139 | { |
---|
1140 | // Soft hadronization splitting: sample transversal momenta for sea and valence quarks |
---|
1141 | G4double phi, pts; |
---|
1142 | G4double SumPy = 0.; |
---|
1143 | G4double SumPx = 0.; |
---|
1144 | G4ThreeVector Pos = GetPosition(); |
---|
1145 | G4int nSeaPair = GetSoftCollisionCount()-1; |
---|
1146 | |
---|
1147 | // here the condition,to ensure viability of splitting, also in cases |
---|
1148 | // where difractive excitation occured together with soft scattering. |
---|
1149 | //G4double LightConeMomentum=(Direction)? Get4Momentum().plus():Get4Momentum().minus(); |
---|
1150 | //G4double Xmin = theMinPz/LightConeMomentum; |
---|
1151 | G4double Xmin = theMinPz/( Get4Momentum().e() - GetMass() ); |
---|
1152 | while(Xmin>=1-(2*nSeaPair+1)*Xmin) Xmin*=0.95; |
---|
1153 | |
---|
1154 | G4int aSeaPair; |
---|
1155 | for (aSeaPair = 0; aSeaPair < nSeaPair; aSeaPair++) |
---|
1156 | { |
---|
1157 | // choose quark flavour, d:u:s = 1:1:(1/StrangeSuppress-2) |
---|
1158 | G4int aPDGCode = 1 + (G4int)(G4UniformRand()/StrangeSuppress); |
---|
1159 | |
---|
1160 | // BuildSeaQuark() determines quark spin, isospin and colour |
---|
1161 | // via parton-constructor G4QParton(aPDGCode) |
---|
1162 | G4QParton* aParton = BuildSeaQuark(false, aPDGCode); |
---|
1163 | |
---|
1164 | // G4cout << "G4QGSMSplitableHadron::SoftSplitUp()" << G4endl; |
---|
1165 | |
---|
1166 | // G4cout << "Parton 1: " |
---|
1167 | // << " PDGcode: " << aPDGCode |
---|
1168 | // << " - Name: " << aParton->GetDefinition()->GetParticleName() |
---|
1169 | // << " - Type: " << aParton->GetDefinition()->GetParticleType() |
---|
1170 | // << " - Spin-3: " << aParton->GetSpinZ() |
---|
1171 | // << " - Colour: " << aParton->GetColour() << G4endl; |
---|
1172 | |
---|
1173 | // save colour a spin-3 for anti-quark |
---|
1174 | G4int firstPartonColour = aParton->GetColour(); |
---|
1175 | G4double firstPartonSpinZ = aParton->GetSpinZ(); |
---|
1176 | |
---|
1177 | SumPx += aParton->Get4Momentum().px(); |
---|
1178 | SumPy += aParton->Get4Momentum().py(); |
---|
1179 | Color.push_back(aParton); |
---|
1180 | |
---|
1181 | // create anti-quark |
---|
1182 | aParton = BuildSeaQuark(true, aPDGCode); |
---|
1183 | aParton->SetSpinZ(-firstPartonSpinZ); |
---|
1184 | aParton->SetColour(-firstPartonColour); |
---|
1185 | |
---|
1186 | // G4cout << "Parton 2: " |
---|
1187 | // << " PDGcode: " << -aPDGCode |
---|
1188 | // << " - Name: " << aParton->GetDefinition()->GetParticleName() |
---|
1189 | // << " - Type: " << aParton->GetDefinition()->GetParticleType() |
---|
1190 | // << " - Spin-3: " << aParton->GetSpinZ() |
---|
1191 | // << " - Colour: " << aParton->GetColour() << G4endl; |
---|
1192 | // G4cerr << "------------" << G4endl; |
---|
1193 | |
---|
1194 | SumPx += aParton->Get4Momentum().px(); |
---|
1195 | SumPy += aParton->Get4Momentum().py(); |
---|
1196 | AntiColor.push_back(aParton); |
---|
1197 | } |
---|
1198 | // Valence quark |
---|
1199 | G4QParton* pColorParton = 0; |
---|
1200 | G4QParton* pAntiColorParton = 0; |
---|
1201 | GetValenceQuarkFlavors(pColorParton, pAntiColorParton); |
---|
1202 | G4int ColorEncoding = pColorParton->GetPDGCode(); |
---|
1203 | G4int AntiColorEncoding = pAntiColorParton->GetPDGCode(); |
---|
1204 | |
---|
1205 | pts = sigmaPt*std::sqrt(-std::log(G4UniformRand())); |
---|
1206 | phi = twopi*G4UniformRand(); |
---|
1207 | G4double Px = pts*std::cos(phi); |
---|
1208 | G4double Py = pts*std::sin(phi); |
---|
1209 | SumPx += Px; |
---|
1210 | SumPy += Py; |
---|
1211 | |
---|
1212 | if (ColorEncoding < 0) // use particle definition |
---|
1213 | { |
---|
1214 | G4LorentzVector ColorMom(-SumPx, -SumPy, 0, 0); |
---|
1215 | pColorParton->Set4Momentum(ColorMom); |
---|
1216 | G4LorentzVector AntiColorMom(Px, Py, 0, 0); |
---|
1217 | pAntiColorParton->Set4Momentum(AntiColorMom); |
---|
1218 | } |
---|
1219 | else |
---|
1220 | { |
---|
1221 | G4LorentzVector ColorMom(Px, Py, 0, 0); |
---|
1222 | pColorParton->Set4Momentum(ColorMom); |
---|
1223 | G4LorentzVector AntiColorMom(-SumPx, -SumPy, 0, 0); |
---|
1224 | pAntiColorParton->Set4Momentum(AntiColorMom); |
---|
1225 | } |
---|
1226 | Color.push_back(pColorParton); |
---|
1227 | AntiColor.push_back(pAntiColorParton); |
---|
1228 | |
---|
1229 | // Sample X |
---|
1230 | G4int nAttempt = 0; |
---|
1231 | G4double SumX = 0; |
---|
1232 | G4double aBeta = beta; |
---|
1233 | G4double ColorX, AntiColorX; |
---|
1234 | G4double HPWtest = 0; |
---|
1235 | G4int aPDG=std::abs(GetPDGCode()); |
---|
1236 | if (aPDG ==211 || aPDG == 22 || aPDG == 111) aBeta = 1.; |
---|
1237 | else if (aPDG == 321) aBeta = 0.; |
---|
1238 | else G4cout<<"-Warning-G4QHadron::SplitUp: wrong PDG="<<GetPDGCode()<<G4endl; |
---|
1239 | do |
---|
1240 | { |
---|
1241 | SumX = 0; |
---|
1242 | nAttempt++; |
---|
1243 | G4int NumberOfUnsampledSeaQuarks = 2*nSeaPair; |
---|
1244 | G4double beta1 = beta; |
---|
1245 | if (std::abs(ColorEncoding) <= 1000 && std::abs(AntiColorEncoding) <= 1000) beta1 = 1.; //... in a meson |
---|
1246 | ColorX = SampleX(Xmin, NumberOfUnsampledSeaQuarks, 2*nSeaPair, aBeta); |
---|
1247 | HPWtest = ColorX; |
---|
1248 | //while (ColorX < Xmin || ColorX > 1. || 1. - ColorX <= Xmin) |
---|
1249 | //{ |
---|
1250 | //} |
---|
1251 | Color.back()->SetX(SumX = ColorX); // this is the valenz quark. |
---|
1252 | |
---|
1253 | std::list<G4QParton*>::iterator icolor = Color.begin(); |
---|
1254 | std::list<G4QParton*>::iterator ecolor = Color.end(); |
---|
1255 | std::list<G4QParton*>::iterator ianticolor = AntiColor.begin(); |
---|
1256 | std::list<G4QParton*>::iterator eanticolor = AntiColor.end(); |
---|
1257 | for ( ; icolor != ecolor && ianticolor != eanticolor; ++icolor, ++ianticolor) |
---|
1258 | { |
---|
1259 | NumberOfUnsampledSeaQuarks--; |
---|
1260 | ColorX = SampleX(Xmin, NumberOfUnsampledSeaQuarks, 2*nSeaPair, aBeta); |
---|
1261 | (*icolor)->SetX(ColorX); |
---|
1262 | SumX += ColorX; |
---|
1263 | NumberOfUnsampledSeaQuarks--; |
---|
1264 | AntiColorX = SampleX(Xmin, NumberOfUnsampledSeaQuarks, 2*nSeaPair, aBeta); |
---|
1265 | (*ianticolor)->SetX(AntiColorX); // the 'sea' partons |
---|
1266 | SumX += AntiColorX; |
---|
1267 | if (1. - SumX <= Xmin) break; |
---|
1268 | } |
---|
1269 | } while (1. - SumX <= Xmin); |
---|
1270 | AntiColor.back()->SetX(1.0 - SumX); // the di-quark takes the rest, then go to momentum |
---|
1271 | // and here is the bug ;-) @@@@@@@@@@@@@ |
---|
1272 | if(getenv("debug_QGSMSplitableHadron")) |
---|
1273 | G4cout<<"particle energy at split = "<<Get4Momentum().t()<<G4endl; |
---|
1274 | G4double lightCone = ((!Direction) ? Get4Momentum().minus() : Get4Momentum().plus()); |
---|
1275 | // lightCone -= 0.5*Get4Momentum().m(); |
---|
1276 | // hpw testing @@@@@ lightCone = 2.*Get4Momentum().t(); |
---|
1277 | if(getenv("debug_QGSMSplitableHadron") )G4cout << "Light cone = "<<lightCone<<G4endl; |
---|
1278 | std::list<G4QParton*>::iterator icolor = Color.begin(); |
---|
1279 | std::list<G4QParton*>::iterator ecolor = Color.end(); |
---|
1280 | std::list<G4QParton*>::iterator ianticolor = AntiColor.begin(); |
---|
1281 | std::list<G4QParton*>::iterator eanticolor = AntiColor.end(); |
---|
1282 | for ( ; icolor != ecolor && ianticolor != eanticolor; ++icolor, ++ianticolor) |
---|
1283 | { |
---|
1284 | (*icolor)->DefineMomentumInZ(lightCone, Direction); |
---|
1285 | (*ianticolor)->DefineMomentumInZ(lightCone, Direction); |
---|
1286 | } |
---|
1287 | //G4cout <<G4endl<<"XSAMPLE "<<HPWtest<<G4endl; |
---|
1288 | return; |
---|
1289 | } |
---|
1290 | } // End of SplitUp |
---|
1291 | |
---|
1292 | // Boost hadron 4-momentum, using Boost Lorentz vector |
---|
1293 | void G4QHadron::Boost(const G4LorentzVector& boost4M) |
---|
1294 | { |
---|
1295 | // see CERNLIB short writeup U101 for the algorithm |
---|
1296 | G4double bm=boost4M.mag(); |
---|
1297 | G4double factor=(theMomentum.vect()*boost4M.vect()/(boost4M.e()+bm)-theMomentum.e())/bm; |
---|
1298 | theMomentum.setE(theMomentum.dot(boost4M)/bm); |
---|
1299 | theMomentum.setVect(factor*boost4M.vect() + theMomentum.vect()); |
---|
1300 | } // End of Boost |
---|
1301 | |
---|
1302 | // Build one (?M.K.) sea-quark |
---|
1303 | G4QParton* G4QHadron::BuildSeaQuark(G4bool isAntiQuark, G4int aPDGCode) |
---|
1304 | { |
---|
1305 | if (isAntiQuark) aPDGCode*=-1; |
---|
1306 | G4QParton* result = new G4QParton(aPDGCode); |
---|
1307 | result->SetPosition(GetPosition()); |
---|
1308 | G4ThreeVector aPtVector = GaussianPt(sigmaPt, DBL_MAX); |
---|
1309 | G4LorentzVector a4Momentum(aPtVector, 0); |
---|
1310 | result->Set4Momentum(a4Momentum); |
---|
1311 | return result; |
---|
1312 | } // End of BuildSeaQuark |
---|
1313 | |
---|
1314 | G4double G4QHadron::SampleX(G4double anXmin, G4int nSea, G4int totalSea, G4double aBeta) |
---|
1315 | { |
---|
1316 | G4double result; |
---|
1317 | G4double x1, x2; |
---|
1318 | G4double ymax = 0; |
---|
1319 | for(G4int ii=0; ii<100; ii++) // @@ 100 is hardwired ? M.K. |
---|
1320 | { |
---|
1321 | G4double y = std::pow(1./G4double(ii), alpha); |
---|
1322 | y*=std::pow(std::pow(1.-anXmin-totalSea*anXmin,alpha+1)-std::pow(anXmin,alpha+1),nSea); |
---|
1323 | y*=std::pow(1.-anXmin-totalSea*anXmin, aBeta+1) - std::pow(anXmin, aBeta+1); |
---|
1324 | if(y>ymax) ymax = y; |
---|
1325 | } |
---|
1326 | G4double y; |
---|
1327 | G4double xMax=1.-(totalSea+1.)*anXmin; |
---|
1328 | if(anXmin > xMax) |
---|
1329 | { |
---|
1330 | G4cerr<<"***G4QHadron::SampleX: anXmin="<<anXmin<<" > xMax="<<xMax<<", nSea="<<nSea |
---|
1331 | <<", totSea="<<totalSea<<G4endl; |
---|
1332 | G4Exception("G4QHadron::SampleX:","72",FatalException,"TooBigXValue"); |
---|
1333 | } |
---|
1334 | do |
---|
1335 | { |
---|
1336 | x1 = CLHEP::RandFlat::shoot(anXmin, xMax); |
---|
1337 | y = std::pow(x1, alpha); |
---|
1338 | y*=std::pow(std::pow(1.-x1-totalSea*anXmin,alpha+1) - std::pow(anXmin, alpha+1), nSea); |
---|
1339 | y*=std::pow(1.-x1-totalSea*anXmin, aBeta+1) - std::pow(anXmin, aBeta+1); |
---|
1340 | x2 = ymax*G4UniformRand(); |
---|
1341 | } while(x2>y); |
---|
1342 | result = x1; |
---|
1343 | return result; |
---|
1344 | } // End of SampleX |
---|
1345 | |
---|
1346 | |
---|
1347 | void G4QHadron::GetValenceQuarkFlavors(G4QParton* &Parton1, G4QParton* &Parton2) |
---|
1348 | { |
---|
1349 | // Note! convention aEnd = q or (qq)bar and bEnd = qbar or qq. |
---|
1350 | G4int aEnd=0; |
---|
1351 | G4int bEnd=0; |
---|
1352 | G4int HadronEncoding = GetPDGCode(); |
---|
1353 | if(!(GetBaryonNumber())) SplitMeson(HadronEncoding,&aEnd,&bEnd); |
---|
1354 | else SplitBaryon(HadronEncoding, &aEnd, &bEnd); |
---|
1355 | |
---|
1356 | Parton1 = new G4QParton(aEnd); |
---|
1357 | Parton1->SetPosition(GetPosition()); |
---|
1358 | |
---|
1359 | // G4cerr << "G4QGSMSplitableHadron::GetValenceQuarkFlavors()" << G4endl; |
---|
1360 | // G4cerr << "Parton 1: " |
---|
1361 | // << " PDGcode: " << aEnd |
---|
1362 | // << " - Name: " << Parton1->GetDefinition()->GetParticleName() |
---|
1363 | // << " - Type: " << Parton1->GetDefinition()->GetParticleType() |
---|
1364 | // << " - Spin-3: " << Parton1->GetSpinZ() |
---|
1365 | // << " - Colour: " << Parton1->GetColour() << G4endl; |
---|
1366 | |
---|
1367 | Parton2 = new G4QParton(bEnd); |
---|
1368 | Parton2->SetPosition(GetPosition()); |
---|
1369 | |
---|
1370 | // G4cerr << "Parton 2: " |
---|
1371 | // << " PDGcode: " << bEnd |
---|
1372 | // << " - Name: " << Parton2->GetDefinition()->GetParticleName() |
---|
1373 | // << " - Type: " << Parton2->GetDefinition()->GetParticleType() |
---|
1374 | // << " - Spin-3: " << Parton2->GetSpinZ() |
---|
1375 | // << " - Colour: " << Parton2->GetColour() << G4endl; |
---|
1376 | // G4cerr << "... now checking for color and spin conservation - yielding: " << G4endl; |
---|
1377 | |
---|
1378 | // colour of parton 1 choosen at random by G4QParton(aEnd) |
---|
1379 | // colour of parton 2 is the opposite: |
---|
1380 | |
---|
1381 | Parton2->SetColour(-(Parton1->GetColour())); |
---|
1382 | |
---|
1383 | // isospin-3 of both partons is handled by G4Parton(PDGCode) |
---|
1384 | |
---|
1385 | // spin-3 of parton 1 and 2 choosen at random by G4QParton(aEnd) |
---|
1386 | // spin-3 of parton 2 may be constrained by spin of original particle: |
---|
1387 | |
---|
1388 | if ( std::abs(Parton1->GetSpinZ() + Parton2->GetSpinZ()) > GetSpin()) |
---|
1389 | Parton2->SetSpinZ(-(Parton2->GetSpinZ())); |
---|
1390 | |
---|
1391 | // G4cerr << "Parton 2: " |
---|
1392 | // << " PDGcode: " << bEnd |
---|
1393 | // << " - Name: " << Parton2->GetDefinition()->GetParticleName() |
---|
1394 | // << " - Type: " << Parton2->GetDefinition()->GetParticleType() |
---|
1395 | // << " - Spin-3: " << Parton2->GetSpinZ() |
---|
1396 | // << " - Colour: " << Parton2->GetColour() << G4endl; |
---|
1397 | // G4cerr << "------------" << G4endl; |
---|
1398 | |
---|
1399 | } // End of GetValenceQuarkFlavors |
---|
1400 | |
---|
1401 | G4bool G4QHadron::SplitMeson(G4int PDGcode, G4int* aEnd, G4int* bEnd) |
---|
1402 | { |
---|
1403 | G4bool result = true; |
---|
1404 | G4int absPDGcode = std::abs(PDGcode); |
---|
1405 | if (absPDGcode >= 1000) return false; |
---|
1406 | if(absPDGcode == 22) |
---|
1407 | { |
---|
1408 | G4int it=1; |
---|
1409 | if(G4UniformRand()<.5) it++; |
---|
1410 | *aEnd = it; |
---|
1411 | *bEnd = -it; |
---|
1412 | } |
---|
1413 | else |
---|
1414 | { |
---|
1415 | G4int heavy = absPDGcode/100; |
---|
1416 | G4int light = (absPDGcode%100)/10; |
---|
1417 | G4int anti = 1 - 2*(std::max(heavy, light)%2); |
---|
1418 | if (PDGcode < 0 ) anti = -anti; |
---|
1419 | heavy *= anti; |
---|
1420 | light *= -anti; |
---|
1421 | if ( anti < 0) G4SwapObj(&heavy, &light); |
---|
1422 | *aEnd = heavy; |
---|
1423 | *bEnd = light; |
---|
1424 | } |
---|
1425 | return result; |
---|
1426 | } |
---|
1427 | |
---|
1428 | G4bool G4QHadron::SplitBaryon(G4int PDGcode, G4int* quark, G4int* diQuark) |
---|
1429 | { |
---|
1430 | static const G4double r2=.5; |
---|
1431 | static const G4double r3=1./3.; |
---|
1432 | static const G4double d3=2./3.; |
---|
1433 | static const G4double r4=1./4.; |
---|
1434 | static const G4double r6=1./6.; |
---|
1435 | static const G4double r12=1./12.; |
---|
1436 | // |
---|
1437 | std::pair<G4int,G4int> qdq[5]; |
---|
1438 | G4double prb[5]; |
---|
1439 | G4int nc=0; |
---|
1440 | G4int aPDGcode=std::abs(PDGcode); |
---|
1441 | if(aPDGcode==2212) // ==> Proton |
---|
1442 | { |
---|
1443 | nc=3; |
---|
1444 | qdq[0]=make_pair(2203, 1); prb[0]=r3; // uu_1, d |
---|
1445 | qdq[1]=make_pair(2103, 2); prb[1]=r6; // ud_1, u |
---|
1446 | qdq[2]=make_pair(2101, 2); prb[2]=r2; // ud_0, u |
---|
1447 | } |
---|
1448 | else if(aPDGcode==2112) // ==> Neutron |
---|
1449 | { |
---|
1450 | nc=3; |
---|
1451 | qdq[0]=make_pair(2103, 1); prb[0]=r6; // ud_1, d |
---|
1452 | qdq[1]=make_pair(2101, 1); prb[1]=r2; // ud_0, d |
---|
1453 | qdq[2]=make_pair(1103, 2); prb[2]=r3; // dd_1, u |
---|
1454 | } |
---|
1455 | else if(aPDGcode%10<3) // ==> Spin 1/2 Hyperons |
---|
1456 | { |
---|
1457 | if(aPDGcode==3122) |
---|
1458 | { |
---|
1459 | nc=5; |
---|
1460 | qdq[0]=make_pair(2103, 3); prb[0]=r3; // ud_1, s |
---|
1461 | qdq[1]=make_pair(3203, 1); prb[1]=r4; // su_1, d |
---|
1462 | qdq[2]=make_pair(3201, 1); prb[2]=r12; // su_0, d |
---|
1463 | qdq[3]=make_pair(3103, 2); prb[3]=r4; // sd_1, u |
---|
1464 | qdq[4]=make_pair(3101, 2); prb[4]=r12; // sd_0, u |
---|
1465 | } |
---|
1466 | else if(aPDGcode==3222) |
---|
1467 | { |
---|
1468 | nc=3; |
---|
1469 | qdq[0]=make_pair(2203, 3); prb[0]=r3; |
---|
1470 | qdq[1]=make_pair(3203, 2); prb[1]=r6; |
---|
1471 | qdq[2]=make_pair(3201, 2); prb[2]=r2; |
---|
1472 | } |
---|
1473 | else if(aPDGcode==3212) |
---|
1474 | { |
---|
1475 | nc=5; |
---|
1476 | qdq[0]=make_pair(2103, 3); prb[0]=r3; |
---|
1477 | qdq[1]=make_pair(3203, 1); prb[1]=r12; |
---|
1478 | qdq[2]=make_pair(3201, 1); prb[2]=r4; |
---|
1479 | qdq[3]=make_pair(3103, 2); prb[3]=r12; |
---|
1480 | qdq[4]=make_pair(3101, 2); prb[4]=r4; |
---|
1481 | } |
---|
1482 | else if(aPDGcode==3112) |
---|
1483 | { |
---|
1484 | nc=3; |
---|
1485 | qdq[0]=make_pair(1103, 3); prb[0]=r3; |
---|
1486 | qdq[1]=make_pair(3103, 1); prb[1]=r6; |
---|
1487 | qdq[2]=make_pair(3101, 1); prb[2]=r2; |
---|
1488 | } |
---|
1489 | else if(aPDGcode==3312) |
---|
1490 | { |
---|
1491 | nc=3; |
---|
1492 | qdq[0]=make_pair(3103, 3); prb[0]=r6; |
---|
1493 | qdq[1]=make_pair(3101, 3); prb[1]=r2; |
---|
1494 | qdq[2]=make_pair(3303, 1); prb[2]=r3; |
---|
1495 | } |
---|
1496 | else if(aPDGcode==3322) |
---|
1497 | { |
---|
1498 | nc=3; |
---|
1499 | qdq[0]=make_pair(3203, 3); prb[0]=r6; |
---|
1500 | qdq[1]=make_pair(3201, 3); prb[1]=r2; |
---|
1501 | qdq[2]=make_pair(3303, 2); prb[2]=r3; |
---|
1502 | } |
---|
1503 | else return false; |
---|
1504 | } |
---|
1505 | else // ==> Spin 3/2 Baryons (Spin>3/2 is ERROR) |
---|
1506 | { |
---|
1507 | if(aPDGcode==3334) |
---|
1508 | { |
---|
1509 | nc=1; |
---|
1510 | qdq[0]=make_pair(3303, 3); prb[0]=1.; |
---|
1511 | } |
---|
1512 | else if(aPDGcode==2224) |
---|
1513 | { |
---|
1514 | nc=1; |
---|
1515 | qdq[0]=make_pair(2203, 2); prb[0]=1.; |
---|
1516 | } |
---|
1517 | else if(aPDGcode==2214) |
---|
1518 | { |
---|
1519 | nc=2; |
---|
1520 | qdq[0]=make_pair(2203, 1); prb[0]=r3; |
---|
1521 | qdq[1]=make_pair(2103, 2); prb[1]=d3; |
---|
1522 | } |
---|
1523 | else if(aPDGcode==2114) |
---|
1524 | { |
---|
1525 | nc=2; |
---|
1526 | qdq[0]=make_pair(2103, 1); prb[0]=d3; |
---|
1527 | qdq[1]=make_pair(2103, 2); prb[1]=r3; |
---|
1528 | } |
---|
1529 | else if(aPDGcode==1114) |
---|
1530 | { |
---|
1531 | nc=1; |
---|
1532 | qdq[0]=make_pair(1103, 1); prb[0]=1.; |
---|
1533 | } |
---|
1534 | else if(aPDGcode==3224) |
---|
1535 | { |
---|
1536 | nc=2; |
---|
1537 | qdq[0]=make_pair(2203, 3); prb[0]=r3; |
---|
1538 | qdq[1]=make_pair(3203, 2); prb[1]=d3; |
---|
1539 | } |
---|
1540 | else if(aPDGcode==3214) |
---|
1541 | { |
---|
1542 | nc=3; |
---|
1543 | qdq[0]=make_pair(2103, 3); prb[0]=r3; |
---|
1544 | qdq[1]=make_pair(3203, 1); prb[1]=r3; |
---|
1545 | qdq[2]=make_pair(3103, 2); prb[2]=r3; |
---|
1546 | } |
---|
1547 | else if(aPDGcode==3114) |
---|
1548 | { |
---|
1549 | nc=2; |
---|
1550 | qdq[0]=make_pair(1103, 3); prb[0]=r3; |
---|
1551 | qdq[1]=make_pair(3103, 1); prb[1]=d3; |
---|
1552 | } |
---|
1553 | else if(aPDGcode==3324) |
---|
1554 | { |
---|
1555 | nc=2; |
---|
1556 | qdq[0]=make_pair(3203, 3); prb[0]=r3; |
---|
1557 | qdq[1]=make_pair(3303, 2); prb[1]=d3; |
---|
1558 | } |
---|
1559 | else if(aPDGcode==3314) |
---|
1560 | { |
---|
1561 | nc=2; |
---|
1562 | qdq[0]=make_pair(3103, 3); prb[0]=d3; |
---|
1563 | qdq[1]=make_pair(3303, 1); prb[1]=r3; |
---|
1564 | } |
---|
1565 | else return false; |
---|
1566 | } |
---|
1567 | G4double random = G4UniformRand(); |
---|
1568 | G4double sum = 0.; |
---|
1569 | for(G4int i=0; i<nc; i++) |
---|
1570 | { |
---|
1571 | sum += prb[i]; |
---|
1572 | if(sum>random) |
---|
1573 | { |
---|
1574 | if(PDGcode>0) |
---|
1575 | { |
---|
1576 | *diQuark= qdq[i].first; |
---|
1577 | *quark = qdq[i].second; |
---|
1578 | } |
---|
1579 | else |
---|
1580 | { |
---|
1581 | *diQuark= -qdq[i].first; |
---|
1582 | *quark = -qdq[i].second; |
---|
1583 | } |
---|
1584 | break; |
---|
1585 | } |
---|
1586 | } |
---|
1587 | return true; |
---|
1588 | } |
---|
1589 | |
---|
1590 | G4ThreeVector G4QHadron::GaussianPt(G4double widthSquare, G4double maxPtSquare) |
---|
1591 | { |
---|
1592 | G4double R=0.; |
---|
1593 | while ((R = -widthSquare*std::log(G4UniformRand())) > maxPtSquare){} |
---|
1594 | R = std::sqrt(R); |
---|
1595 | G4double phi = twopi*G4UniformRand(); |
---|
1596 | return G4ThreeVector(R*std::cos(phi), R*std::sin(phi), 0.); |
---|
1597 | } |
---|