[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // |
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[1340] | 27 | // $Id: G4LundStringFragmentation.cc,v 1.23 2010/09/22 12:36:37 vuzhinsk Exp $ |
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| 28 | // GEANT4 tag $Name: geant4-09-03-ref-09 $ 1.8 |
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[819] | 29 | // |
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| 30 | // ----------------------------------------------------------------------------- |
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| 31 | // GEANT 4 class implementation file |
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| 32 | // |
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| 33 | // History: first implementation, Maxim Komogorov, 10-Jul-1998 |
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| 34 | // ----------------------------------------------------------------------------- |
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| 35 | #include "G4LundStringFragmentation.hh" |
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| 36 | #include "G4FragmentingString.hh" |
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| 37 | #include "G4DiQuarks.hh" |
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| 38 | #include "G4Quarks.hh" |
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| 39 | |
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| 40 | #include "Randomize.hh" |
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| 41 | |
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| 42 | // Class G4LundStringFragmentation |
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[962] | 43 | //************************************************************************************* |
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[819] | 44 | |
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| 45 | G4LundStringFragmentation::G4LundStringFragmentation() |
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| 46 | { |
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[962] | 47 | // ------ For estimation of a minimal string mass --------------- |
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| 48 | Mass_of_light_quark =140.*MeV; |
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| 49 | Mass_of_heavy_quark =500.*MeV; |
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| 50 | Mass_of_string_junction=720.*MeV; |
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| 51 | // ------ An estimated minimal string mass ---------------------- |
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| 52 | MinimalStringMass = 0.; |
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| 53 | MinimalStringMass2 = 0.; |
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| 54 | // ------ Minimal invariant mass used at a string fragmentation - |
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[1340] | 55 | WminLUND = 0.45*GeV; //0.23*GeV; // Uzhi 0.7 -> 0.23 3.8.10 //0.8 1.5 |
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[962] | 56 | // ------ Smooth parameter used at a string fragmentation for --- |
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| 57 | // ------ smearinr sharp mass cut-off --------------------------- |
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| 58 | SmoothParam = 0.2; |
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[819] | 59 | |
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[1337] | 60 | // SetStringTensionParameter(0.25); |
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| 61 | SetStringTensionParameter(1.); |
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[1340] | 62 | |
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| 63 | SetDiquarkBreakProbability(0.05); // Vova Aug. 22 |
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| 64 | |
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| 65 | // For treating of small string decays |
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| 66 | for(G4int i=0; i<3; i++) |
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| 67 | { for(G4int j=0; j<3; j++) |
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| 68 | { for(G4int k=0; k<6; k++) |
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| 69 | { Meson[i][j][k]=0; MesonWeight[i][j][k]=0.; |
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| 70 | } |
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| 71 | } |
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[819] | 72 | } |
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[1340] | 73 | //-------------------------- |
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| 74 | Meson[0][0][0]=111; // dbar-d Pi0 |
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| 75 | MesonWeight[0][0][0]=pspin_meson*(1.-scalarMesonMix[0]); |
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[819] | 76 | |
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[1340] | 77 | Meson[0][0][1]=221; // dbar-d Eta |
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| 78 | MesonWeight[0][0][1]=pspin_meson*(scalarMesonMix[0]-scalarMesonMix[1]); |
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| 79 | |
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| 80 | Meson[0][0][2]=331; // dbar-d EtaPrime |
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| 81 | MesonWeight[0][0][2]=pspin_meson*(scalarMesonMix[1]); |
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| 82 | |
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| 83 | Meson[0][0][3]=113; // dbar-d Rho0 |
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| 84 | MesonWeight[0][0][3]=(1.-pspin_meson)*(1.-vectorMesonMix[0]); |
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| 85 | |
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| 86 | Meson[0][0][4]=223; // dbar-d Omega |
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| 87 | MesonWeight[0][0][4]=(1.-pspin_meson)*(vectorMesonMix[0]); |
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| 88 | //-------------------------- |
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| 89 | |
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| 90 | Meson[0][1][0]=211; // dbar-u Pi+ |
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| 91 | MesonWeight[0][1][0]=pspin_meson; |
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| 92 | |
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| 93 | Meson[0][1][1]=213; // dbar-u Rho+ |
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| 94 | MesonWeight[0][1][1]=(1.-pspin_meson); |
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| 95 | //-------------------------- |
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| 96 | |
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| 97 | Meson[0][2][0]=311; // dbar-s K0bar |
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| 98 | MesonWeight[0][2][0]=pspin_meson; |
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| 99 | |
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| 100 | Meson[0][2][1]=313; // dbar-s K*0bar |
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| 101 | MesonWeight[0][2][1]=(1.-pspin_meson); |
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| 102 | //-------------------------- |
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| 103 | //-------------------------- |
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| 104 | Meson[1][0][0]=211; // ubar-d Pi- |
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| 105 | MesonWeight[1][0][0]=pspin_meson; |
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| 106 | |
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| 107 | Meson[1][0][1]=213; // ubar-d Rho- |
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| 108 | MesonWeight[1][0][1]=(1.-pspin_meson); |
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| 109 | //-------------------------- |
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| 110 | |
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| 111 | Meson[1][1][0]=111; // ubar-u Pi0 |
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| 112 | MesonWeight[1][1][0]=pspin_meson*(1.-scalarMesonMix[0]); |
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| 113 | |
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| 114 | Meson[1][1][1]=221; // ubar-u Eta |
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| 115 | MesonWeight[1][1][1]=pspin_meson*(scalarMesonMix[0]-scalarMesonMix[1]); |
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| 116 | |
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| 117 | Meson[1][1][2]=331; // ubar-u EtaPrime |
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| 118 | MesonWeight[1][1][2]=pspin_meson*(scalarMesonMix[1]); |
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| 119 | |
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| 120 | Meson[1][1][3]=113; // ubar-u Rho0 |
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| 121 | MesonWeight[1][1][3]=(1.-pspin_meson)*(1.-vectorMesonMix[0]); |
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| 122 | |
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| 123 | Meson[1][1][4]=223; // ubar-u Omega |
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| 124 | MesonWeight[1][1][4]=(1.-pspin_meson)*(scalarMesonMix[0]); |
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| 125 | //-------------------------- |
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| 126 | |
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| 127 | Meson[1][2][0]=321; // ubar-s K- |
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| 128 | MesonWeight[1][2][0]=pspin_meson; |
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| 129 | |
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| 130 | Meson[1][2][1]=323; // ubar-s K*-bar - |
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| 131 | MesonWeight[1][2][1]=(1.-pspin_meson); |
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| 132 | //-------------------------- |
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| 133 | //-------------------------- |
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| 134 | |
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| 135 | Meson[2][0][0]=311; // sbar-d K0 |
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| 136 | MesonWeight[2][0][0]=pspin_meson; |
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| 137 | |
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| 138 | Meson[2][0][1]=313; // sbar-d K*0 |
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| 139 | MesonWeight[2][0][1]=(1.-pspin_meson); |
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| 140 | //-------------------------- |
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| 141 | |
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| 142 | Meson[2][1][0]=321; // sbar-u K+ |
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| 143 | MesonWeight[2][1][0]=pspin_meson; |
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| 144 | |
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| 145 | Meson[2][1][1]=323; // sbar-u K*+ |
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| 146 | MesonWeight[2][1][1]=(1.-pspin_meson); |
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| 147 | //-------------------------- |
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| 148 | |
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| 149 | Meson[2][2][0]=221; // sbar-s Eta |
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| 150 | MesonWeight[2][2][0]=pspin_meson*(1.-scalarMesonMix[5]); |
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| 151 | |
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| 152 | Meson[2][2][1]=331; // sbar-s EtaPrime |
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| 153 | MesonWeight[2][2][1]=pspin_meson*(1.-scalarMesonMix[5]); |
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| 154 | |
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| 155 | Meson[2][2][3]=333; // sbar-s EtaPrime |
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| 156 | MesonWeight[2][2][3]=(1.-pspin_meson)*(vectorMesonMix[5]); |
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| 157 | //-------------------------- |
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| 158 | |
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| 159 | for(G4int i=0; i<3; i++) |
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| 160 | { for(G4int j=0; j<3; j++) |
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| 161 | { for(G4int k=0; k<3; k++) |
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| 162 | { for(G4int l=0; l<4; l++) |
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| 163 | { Baryon[i][j][k][l]=0; BaryonWeight[i][j][k][l]=0.;} |
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| 164 | } |
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| 165 | } |
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| 166 | } |
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| 167 | |
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| 168 | //--------------------------------------- |
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| 169 | Baryon[0][0][0][0]=1114; // Delta- |
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| 170 | BaryonWeight[0][0][0][0]=1.; |
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| 171 | |
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| 172 | //--------------------------------------- |
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| 173 | Baryon[0][0][1][0]=2112; // neutron |
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| 174 | BaryonWeight[0][0][1][0]=pspin_barion; |
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| 175 | |
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| 176 | Baryon[0][0][1][1]=2114; // Delta0 |
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| 177 | BaryonWeight[0][0][1][1]=(1.-pspin_barion); |
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| 178 | |
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| 179 | //--------------------------------------- |
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| 180 | Baryon[0][0][2][0]=3112; // Sigma- |
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| 181 | BaryonWeight[0][0][2][0]=pspin_barion; |
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| 182 | |
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| 183 | Baryon[0][0][2][1]=3114; // Sigma*- |
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| 184 | BaryonWeight[0][0][2][1]=(1.-pspin_barion); |
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| 185 | |
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| 186 | //--------------------------------------- |
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| 187 | Baryon[0][1][0][0]=2112; // neutron |
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| 188 | BaryonWeight[0][1][0][0]=pspin_barion; |
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| 189 | |
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| 190 | Baryon[0][1][0][1]=2114; // Delta0 |
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| 191 | BaryonWeight[0][1][0][1]=(1.-pspin_barion); |
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| 192 | |
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| 193 | //--------------------------------------- |
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| 194 | Baryon[0][1][1][0]=2212; // proton |
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| 195 | BaryonWeight[0][1][1][0]=pspin_barion; |
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| 196 | |
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| 197 | Baryon[0][1][1][1]=2214; // Delta+ |
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| 198 | BaryonWeight[0][1][1][1]=(1.-pspin_barion); |
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| 199 | |
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| 200 | //--------------------------------------- |
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| 201 | Baryon[0][1][2][0]=3122; // Lambda |
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| 202 | BaryonWeight[0][1][2][0]=pspin_barion*0.5; |
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| 203 | |
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| 204 | Baryon[0][1][2][1]=3212; // Sigma0 |
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| 205 | BaryonWeight[0][1][2][2]=pspin_barion*0.5; |
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| 206 | |
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| 207 | Baryon[0][1][2][2]=3214; // Sigma*0 |
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| 208 | BaryonWeight[0][1][2][2]=(1.-pspin_barion); |
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| 209 | |
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| 210 | //--------------------------------------- |
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| 211 | Baryon[0][2][0][0]=3112; // Sigma- |
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| 212 | BaryonWeight[0][2][0][0]=pspin_barion; |
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| 213 | |
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| 214 | Baryon[0][2][0][1]=3114; // Sigma*- |
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| 215 | BaryonWeight[0][2][0][1]=(1.-pspin_barion); |
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| 216 | |
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| 217 | //--------------------------------------- |
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| 218 | Baryon[0][2][1][0]=3122; // Lambda |
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| 219 | BaryonWeight[0][2][1][0]=pspin_barion*0.5; |
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| 220 | |
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| 221 | Baryon[0][2][1][1]=3212; // Sigma0 |
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| 222 | BaryonWeight[0][2][1][1]=pspin_barion*0.5; |
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| 223 | |
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| 224 | Baryon[0][2][1][2]=3214; // Sigma*0 |
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| 225 | BaryonWeight[0][2][1][2]=(1.-pspin_barion); |
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| 226 | |
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| 227 | //--------------------------------------- |
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| 228 | Baryon[0][2][2][0]=3312; // Theta- |
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| 229 | BaryonWeight[0][2][2][0]=pspin_barion; |
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| 230 | |
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| 231 | Baryon[0][2][2][1]=3314; // Theta*- |
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| 232 | BaryonWeight[0][2][2][1]=(1.-pspin_barion); |
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| 233 | |
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| 234 | //--------------------------------------- |
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| 235 | //--------------------------------------- |
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| 236 | Baryon[1][0][0][0]=2112; // neutron |
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| 237 | BaryonWeight[1][0][0][0]=pspin_barion; |
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| 238 | |
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| 239 | Baryon[1][0][0][1]=2114; // Delta0 |
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| 240 | BaryonWeight[1][0][0][1]=(1.-pspin_barion); |
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| 241 | |
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| 242 | //--------------------------------------- |
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| 243 | Baryon[1][0][1][0]=2212; // proton |
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| 244 | BaryonWeight[1][0][1][0]=pspin_barion; |
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| 245 | |
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| 246 | Baryon[1][0][1][1]=2214; // Delta+ |
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| 247 | BaryonWeight[1][0][1][1]=(1.-pspin_barion); |
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| 248 | |
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| 249 | //--------------------------------------- |
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| 250 | Baryon[1][0][2][0]=3122; // Lambda |
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| 251 | BaryonWeight[1][0][2][0]=pspin_barion*0.5; |
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| 252 | |
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| 253 | Baryon[1][0][2][1]=3212; // Sigma0 |
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| 254 | BaryonWeight[1][0][2][1]=pspin_barion*0.5; |
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| 255 | |
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| 256 | Baryon[1][0][2][2]=3214; // Sigma*0 |
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| 257 | BaryonWeight[1][0][2][2]=(1.-pspin_barion); |
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| 258 | |
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| 259 | //--------------------------------------- |
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| 260 | Baryon[1][1][0][0]=2212; // proton |
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| 261 | BaryonWeight[1][1][0][0]=pspin_barion; |
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| 262 | |
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| 263 | Baryon[1][1][0][1]=2214; // Delta+ |
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| 264 | BaryonWeight[1][1][0][1]=(1.-pspin_barion); |
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| 265 | |
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| 266 | //--------------------------------------- |
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| 267 | Baryon[1][1][1][0]=2224; // Delta++ |
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| 268 | BaryonWeight[1][1][1][0]=1.; |
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| 269 | |
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| 270 | //--------------------------------------- |
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| 271 | Baryon[1][1][2][0]=3222; // Sigma+ |
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| 272 | BaryonWeight[1][1][2][0]=pspin_barion; |
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| 273 | |
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| 274 | Baryon[1][1][2][1]=3224; // Sigma*+ |
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| 275 | BaryonWeight[1][1][2][1]=(1.-pspin_barion); |
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| 276 | |
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| 277 | //--------------------------------------- |
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| 278 | Baryon[1][2][0][0]=3122; // Lambda |
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| 279 | BaryonWeight[1][2][0][0]=pspin_barion*0.5; |
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| 280 | |
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| 281 | Baryon[1][2][0][1]=3212; // Sigma0 |
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| 282 | BaryonWeight[1][2][0][1]=pspin_barion*0.5; |
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| 283 | |
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| 284 | Baryon[1][2][0][2]=3214; // Sigma*0 |
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| 285 | BaryonWeight[1][2][0][2]=(1.-pspin_barion); |
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| 286 | |
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| 287 | //--------------------------------------- |
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| 288 | Baryon[1][2][1][0]=3222; // Sigma+ |
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| 289 | BaryonWeight[1][2][1][0]=pspin_barion; |
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| 290 | |
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| 291 | Baryon[1][2][1][1]=3224; // Sigma*+ |
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| 292 | BaryonWeight[1][2][1][1]=(1.-pspin_barion); |
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| 293 | |
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| 294 | //--------------------------------------- |
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| 295 | Baryon[1][2][2][0]=3322; // Theta0 |
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| 296 | BaryonWeight[1][2][2][0]=pspin_barion; |
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| 297 | |
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| 298 | Baryon[1][2][2][1]=3324; // Theta*0 |
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| 299 | BaryonWeight[1][2][2][1]=(1.-pspin_barion); |
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| 300 | |
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| 301 | //--------------------------------------- |
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| 302 | //--------------------------------------- |
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| 303 | Baryon[2][0][0][0]=3112; // Sigma- |
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| 304 | BaryonWeight[2][0][0][0]=pspin_barion; |
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| 305 | |
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| 306 | Baryon[2][0][0][1]=3114; // Sigma*- |
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| 307 | BaryonWeight[2][0][0][1]=(1.-pspin_barion); |
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| 308 | |
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| 309 | //--------------------------------------- |
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| 310 | Baryon[2][0][1][0]=3122; // Lambda |
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| 311 | BaryonWeight[2][0][1][0]=pspin_barion*0.5; |
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| 312 | |
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| 313 | Baryon[2][0][1][1]=3212; // Sigma0 |
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| 314 | BaryonWeight[2][0][1][1]=pspin_barion*0.5; |
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| 315 | |
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| 316 | Baryon[2][0][1][2]=3214; // Sigma*0 |
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| 317 | BaryonWeight[2][0][1][2]=(1.-pspin_barion); |
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| 318 | |
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| 319 | //--------------------------------------- |
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| 320 | Baryon[2][0][2][0]=3312; // Sigma- |
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| 321 | BaryonWeight[2][0][2][0]=pspin_barion; |
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| 322 | |
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| 323 | Baryon[2][0][2][1]=3314; // Sigma*- |
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| 324 | BaryonWeight[2][0][2][1]=(1.-pspin_barion); |
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| 325 | |
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| 326 | //--------------------------------------- |
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| 327 | Baryon[2][1][0][0]=3122; // Lambda |
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| 328 | BaryonWeight[2][1][0][0]=pspin_barion*0.5; |
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| 329 | |
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| 330 | Baryon[2][1][0][1]=3212; // Sigma0 |
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| 331 | BaryonWeight[2][1][0][1]=pspin_barion*0.5; |
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| 332 | |
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| 333 | Baryon[2][1][0][2]=3214; // Sigma*0 |
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| 334 | BaryonWeight[2][1][0][2]=(1.-pspin_barion); |
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| 335 | |
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| 336 | //--------------------------------------- |
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| 337 | Baryon[2][1][1][0]=3222; // Sigma+ |
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| 338 | BaryonWeight[2][1][1][0]=pspin_barion; |
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| 339 | |
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| 340 | Baryon[2][1][1][1]=3224; // Sigma*+ |
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| 341 | BaryonWeight[2][1][1][1]=(1.-pspin_barion); |
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| 342 | |
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| 343 | //--------------------------------------- |
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| 344 | Baryon[2][1][2][0]=3322; // Theta0 |
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| 345 | BaryonWeight[2][1][2][0]=pspin_barion; |
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| 346 | |
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| 347 | Baryon[2][1][2][1]=3324; // Theta*0 |
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| 348 | BaryonWeight[2][1][2][2]=(1.-pspin_barion); |
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| 349 | |
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| 350 | //--------------------------------------- |
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| 351 | Baryon[2][2][0][0]=3312; // Theta- |
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| 352 | BaryonWeight[2][2][0][0]=pspin_barion; |
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| 353 | |
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| 354 | Baryon[2][2][0][1]=3314; // Theta*- |
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| 355 | BaryonWeight[2][2][0][1]=(1.-pspin_barion); |
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| 356 | |
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| 357 | //--------------------------------------- |
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| 358 | Baryon[2][2][1][0]=3322; // Theta0 |
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| 359 | BaryonWeight[2][2][1][0]=pspin_barion; |
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| 360 | |
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| 361 | Baryon[2][2][1][1]=3324; // Theta*0 |
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| 362 | BaryonWeight[2][2][1][1]=(1.-pspin_barion); |
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| 363 | |
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| 364 | //--------------------------------------- |
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| 365 | Baryon[2][2][2][0]=3334; // Omega |
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| 366 | BaryonWeight[2][2][2][0]=1.; |
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| 367 | |
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| 368 | //--------------------------------------- |
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| 369 | /* |
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| 370 | for(G4int i=0; i<3; i++) |
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| 371 | { for(G4int j=0; j<3; j++) |
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| 372 | { for(G4int k=0; k<3; k++) |
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| 373 | { for(G4int l=0; l<4; l++) |
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| 374 | { G4cout<<i<<" "<<j<<" "<<k<<" "<<l<<" "<<Baryon[i][j][k][l]<<G4endl;} |
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| 375 | } |
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| 376 | } |
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| 377 | } |
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| 378 | G4int Uzhi; |
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| 379 | G4cin>>Uzhi; |
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| 380 | */ |
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| 381 | //StrangeSuppress=0.38; |
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| 382 | Prob_QQbar[0]=StrangeSuppress; // Probability of ddbar production |
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| 383 | Prob_QQbar[1]=StrangeSuppress; // Probability of uubar production |
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| 384 | Prob_QQbar[2]=StrangeSuppress/(2.+StrangeSuppress);//(1.-2.*StrangeSuppress); // Probability of ssbar production |
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| 385 | } |
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| 386 | |
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[962] | 387 | // -------------------------------------------------------------- |
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[819] | 388 | G4LundStringFragmentation::G4LundStringFragmentation(const G4LundStringFragmentation &) : G4VLongitudinalStringDecay() |
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| 389 | { |
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| 390 | } |
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| 391 | |
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| 392 | G4LundStringFragmentation::~G4LundStringFragmentation() |
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| 393 | { |
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| 394 | } |
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| 395 | |
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[962] | 396 | //************************************************************************************* |
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[819] | 397 | |
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| 398 | const G4LundStringFragmentation & G4LundStringFragmentation::operator=(const G4LundStringFragmentation &) |
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| 399 | { |
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| 400 | throw G4HadronicException(__FILE__, __LINE__, "G4LundStringFragmentation::operator= meant to not be accessable"); |
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| 401 | return *this; |
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| 402 | } |
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| 403 | |
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| 404 | int G4LundStringFragmentation::operator==(const G4LundStringFragmentation &right) const |
---|
| 405 | { |
---|
| 406 | return !memcmp(this, &right, sizeof(G4LundStringFragmentation)); |
---|
| 407 | } |
---|
| 408 | |
---|
| 409 | int G4LundStringFragmentation::operator!=(const G4LundStringFragmentation &right) const |
---|
| 410 | { |
---|
| 411 | return memcmp(this, &right, sizeof(G4LundStringFragmentation)); |
---|
| 412 | } |
---|
| 413 | |
---|
[962] | 414 | //-------------------------------------------------------------------------------------- |
---|
[1337] | 415 | void G4LundStringFragmentation::SetMinimalStringMass(const G4FragmentingString * const string) |
---|
[962] | 416 | { |
---|
| 417 | G4double EstimatedMass=0.; |
---|
| 418 | G4int Number_of_quarks=0; |
---|
[819] | 419 | |
---|
[962] | 420 | G4int Qleft =std::abs(string->GetLeftParton()->GetPDGEncoding()); |
---|
| 421 | |
---|
| 422 | if( Qleft > 1000) |
---|
| 423 | { |
---|
| 424 | Number_of_quarks+=2; |
---|
| 425 | G4int q1=Qleft/1000; |
---|
| 426 | if( q1 < 3) {EstimatedMass +=Mass_of_light_quark;} |
---|
| 427 | if( q1 > 2) {EstimatedMass +=Mass_of_heavy_quark;} |
---|
| 428 | |
---|
| 429 | G4int q2=(Qleft/100)%10; |
---|
| 430 | if( q2 < 3) {EstimatedMass +=Mass_of_light_quark;} |
---|
| 431 | if( q2 > 2) {EstimatedMass +=Mass_of_heavy_quark;} |
---|
| 432 | EstimatedMass +=Mass_of_string_junction; |
---|
| 433 | } |
---|
| 434 | else |
---|
| 435 | { |
---|
| 436 | Number_of_quarks++; |
---|
| 437 | if( Qleft < 3) {EstimatedMass +=Mass_of_light_quark;} |
---|
| 438 | if( Qleft > 2) {EstimatedMass +=Mass_of_heavy_quark;} |
---|
| 439 | } |
---|
| 440 | |
---|
| 441 | G4int Qright=std::abs(string->GetRightParton()->GetPDGEncoding()); |
---|
| 442 | |
---|
| 443 | if( Qright > 1000) |
---|
| 444 | { |
---|
| 445 | Number_of_quarks+=2; |
---|
| 446 | G4int q1=Qright/1000; |
---|
| 447 | if( q1 < 3) {EstimatedMass +=Mass_of_light_quark;} |
---|
| 448 | if( q1 > 2) {EstimatedMass +=Mass_of_heavy_quark;} |
---|
| 449 | |
---|
| 450 | G4int q2=(Qright/100)%10; |
---|
| 451 | if( q2 < 3) {EstimatedMass +=Mass_of_light_quark;} |
---|
| 452 | if( q2 > 2) {EstimatedMass +=Mass_of_heavy_quark;} |
---|
| 453 | EstimatedMass +=Mass_of_string_junction; |
---|
| 454 | } |
---|
| 455 | else |
---|
| 456 | { |
---|
| 457 | Number_of_quarks++; |
---|
| 458 | if( Qright < 3) {EstimatedMass +=Mass_of_light_quark;} |
---|
| 459 | if( Qright > 2) {EstimatedMass +=Mass_of_heavy_quark;} |
---|
| 460 | } |
---|
| 461 | |
---|
| 462 | if(Number_of_quarks==2){EstimatedMass +=100.*MeV;} |
---|
| 463 | if(Number_of_quarks==3){EstimatedMass += 20.*MeV;} |
---|
| 464 | if(Number_of_quarks==4){EstimatedMass -=2.*Mass_of_string_junction; |
---|
| 465 | if(EstimatedMass <= 1600.*MeV){EstimatedMass-=200.*MeV;} |
---|
| 466 | else {EstimatedMass+=100.*MeV;} |
---|
| 467 | } |
---|
| 468 | MinimalStringMass=EstimatedMass; |
---|
| 469 | SetMinimalStringMass2(EstimatedMass); |
---|
| 470 | } |
---|
| 471 | |
---|
| 472 | //-------------------------------------------------------------------------------------- |
---|
| 473 | void G4LundStringFragmentation::SetMinimalStringMass2( |
---|
| 474 | const G4double aValue) |
---|
[819] | 475 | { |
---|
[962] | 476 | MinimalStringMass2=aValue * aValue; |
---|
| 477 | } |
---|
[819] | 478 | |
---|
[962] | 479 | //-------------------------------------------------------------------------------------- |
---|
| 480 | G4KineticTrackVector* G4LundStringFragmentation::FragmentString( |
---|
| 481 | const G4ExcitedString& theString) |
---|
| 482 | { |
---|
[819] | 483 | // Can no longer modify Parameters for Fragmentation. |
---|
| 484 | PastInitPhase=true; |
---|
[1340] | 485 | //SetVectorMesonProbability(1.); |
---|
| 486 | //SetSpinThreeHalfBarionProbability(1.); |
---|
[1337] | 487 | |
---|
[819] | 488 | // check if string has enough mass to fragment... |
---|
[962] | 489 | |
---|
| 490 | SetMassCut(160.*MeV); // For LightFragmentationTest it is required |
---|
| 491 | // that no one pi-meson can be produced |
---|
[1340] | 492 | // |
---|
| 493 | //G4cout<<G4endl<<"G4LundStringFragmentation::"<<G4endl; |
---|
| 494 | //G4cout<<"FragmentString Position"<<theString.GetPosition()/fermi<<" "<<theString.GetTimeOfCreation()/fermi<<G4endl; |
---|
| 495 | //G4cout<<"FragmentString Momentum"<<theString.Get4Momentum()<<theString.Get4Momentum().mag()<<G4endl; |
---|
| 496 | // |
---|
| 497 | G4FragmentingString aString(theString); |
---|
[1337] | 498 | SetMinimalStringMass(&aString); |
---|
| 499 | |
---|
[1340] | 500 | /* |
---|
| 501 | G4cout<<"St Frag "<<MinimalStringMass<<" "<<WminLUND<<" "<<(1.-SmoothParam)<<" "<< theString.Get4Momentum().mag()<<G4endl; |
---|
| 502 | G4cout<<(MinimalStringMass+WminLUND)*(1.-SmoothParam)<<" "<<theString.Get4Momentum().mag()<<G4endl; |
---|
| 503 | |
---|
[1337] | 504 | if((MinimalStringMass+WminLUND)*(1.-SmoothParam) > theString.Get4Momentum().mag()) |
---|
[1340] | 505 | {SetMassCut(1000.*MeV);} |
---|
| 506 | else {SetMassCut(160.*MeV);} |
---|
| 507 | */ |
---|
| 508 | // V.U. 20.06.10 in order to put in correspondence LightFragTest and MinStrMass |
---|
[1337] | 509 | |
---|
[1340] | 510 | G4KineticTrackVector * LeftVector(0); |
---|
| 511 | // G4KineticTrackVector * LeftVector=LightFragmentationTest(&theString); |
---|
| 512 | //G4cout<<"Min Str Mass "<<MinimalStringMass<<G4endl; |
---|
| 513 | if(!IsFragmentable(&aString)) // produce 1 hadron |
---|
| 514 | { |
---|
| 515 | //G4cout<<"Non fragmentable"<<G4endl; |
---|
| 516 | SetMassCut(1000.*MeV); |
---|
| 517 | LeftVector=LightFragmentationTest(&theString); |
---|
| 518 | SetMassCut(160.*MeV); |
---|
[1337] | 519 | |
---|
[1340] | 520 | |
---|
| 521 | //G4cout<<"Prod hadron "<<LeftVector->operator[](0)->GetDefinition()->GetParticleName()<<G4endl; |
---|
| 522 | /* |
---|
| 523 | if(LeftVector->size() == 1) |
---|
| 524 | { |
---|
| 525 | if(! (std::abs(LeftVector->operator[](0)->GetDefinition()->GetPDGMass()- |
---|
| 526 | theString.Get4Momentum().mag()) < 100*MeV)) |
---|
| 527 | { // produce a particle with arbitrary isospin |
---|
| 528 | G4cout<<" produce a particle with arbitrary isospin"<<G4endl; |
---|
| 529 | |
---|
| 530 | pDefPair hadrons((G4ParticleDefinition *)0,(G4ParticleDefinition *)0); |
---|
| 531 | Pcreate build=&G4HadronBuilder::Build; |
---|
| 532 | FragmentationMass(&aString,build,&hadrons); // 0->1 |
---|
| 533 | G4cout<<"Hadron PDG "<<hadrons.first->GetPDGEncoding()<<G4endl; |
---|
| 534 | if ( hadrons.second ==0 ) |
---|
| 535 | {// Substitute string by light hadron, Note that Energy is not conserved here! |
---|
| 536 | // Cleaning up the previously produced hadrons ------------------------------ |
---|
| 537 | std::for_each(LeftVector->begin() , LeftVector->end() , DeleteKineticTrack()); |
---|
| 538 | LeftVector->clear(); |
---|
| 539 | |
---|
| 540 | G4ThreeVector Mom3 = aString.Get4Momentum().vect(); |
---|
| 541 | G4LorentzVector Mom(Mom3,std::sqrt(Mom3.mag2() + sqr(hadrons.first->GetPDGMass()))); |
---|
| 542 | LeftVector->push_back(new G4KineticTrack(hadrons.first, 0, |
---|
| 543 | theString.GetPosition(), |
---|
| 544 | Mom)); |
---|
| 545 | } // end of if ( hadrons.second ==0 ) |
---|
| 546 | } // end of produce a particle with arbitrary isospin |
---|
| 547 | |
---|
| 548 | } // end of if(LeftVector->size() == 1) |
---|
| 549 | */ |
---|
| 550 | } // end of if(!IsFragmentable(&aString)) |
---|
| 551 | |
---|
[819] | 552 | if ( LeftVector != 0 ) { |
---|
[962] | 553 | // Uzhi insert 6.05.08 start |
---|
| 554 | if(LeftVector->size() == 1){ |
---|
| 555 | // One hadron is saved in the interaction |
---|
| 556 | LeftVector->operator[](0)->SetFormationTime(theString.GetTimeOfCreation()); |
---|
| 557 | LeftVector->operator[](0)->SetPosition(theString.GetPosition()); |
---|
| 558 | |
---|
| 559 | /* // To set large formation time open * |
---|
| 560 | LeftVector->operator[](0)->SetFormationTime(theString.GetTimeOfCreation()+100.*fermi); |
---|
| 561 | LeftVector->operator[](0)->SetPosition(theString.GetPosition()); |
---|
| 562 | G4ThreeVector aPosition(theString.GetPosition().x(), |
---|
| 563 | theString.GetPosition().y(), |
---|
| 564 | theString.GetPosition().z()+100.*fermi); |
---|
| 565 | LeftVector->operator[](0)->SetPosition(aPosition); |
---|
| 566 | */ |
---|
| 567 | } else { // 2 hadrons created from qq-qqbar are stored |
---|
[1337] | 568 | |
---|
[962] | 569 | LeftVector->operator[](0)->SetFormationTime(theString.GetTimeOfCreation()); |
---|
| 570 | LeftVector->operator[](0)->SetPosition(theString.GetPosition()); |
---|
| 571 | LeftVector->operator[](1)->SetFormationTime(theString.GetTimeOfCreation()); |
---|
| 572 | LeftVector->operator[](1)->SetPosition(theString.GetPosition()); |
---|
| 573 | } |
---|
| 574 | return LeftVector; |
---|
| 575 | } |
---|
| 576 | |
---|
| 577 | //--------------------- The string can fragment ------------------------------- |
---|
| 578 | //--------------- At least two particles can be produced ---------------------- |
---|
[1340] | 579 | //G4cout<<"Fragmentable"<<G4endl; |
---|
[962] | 580 | LeftVector =new G4KineticTrackVector; |
---|
[819] | 581 | G4KineticTrackVector * RightVector=new G4KineticTrackVector; |
---|
| 582 | |
---|
| 583 | G4ExcitedString *theStringInCMS=CPExcited(theString); |
---|
| 584 | G4LorentzRotation toCms=theStringInCMS->TransformToAlignedCms(); |
---|
| 585 | |
---|
| 586 | G4bool success=false, inner_sucess=true; |
---|
| 587 | G4int attempt=0; |
---|
| 588 | while ( !success && attempt++ < StringLoopInterrupt ) |
---|
[962] | 589 | { // If the string fragmentation do not be happend, repeat the fragmentation--- |
---|
[819] | 590 | G4FragmentingString *currentString=new G4FragmentingString(*theStringInCMS); |
---|
[1340] | 591 | //G4cout<<"Main loop start whilecounter "<<attempt<<G4endl; |
---|
[962] | 592 | // Cleaning up the previously produced hadrons ------------------------------ |
---|
| 593 | std::for_each(LeftVector->begin() , LeftVector->end() , DeleteKineticTrack()); |
---|
| 594 | LeftVector->clear(); |
---|
[819] | 595 | |
---|
| 596 | std::for_each(RightVector->begin(), RightVector->end(), DeleteKineticTrack()); |
---|
| 597 | RightVector->clear(); |
---|
| 598 | |
---|
[962] | 599 | // Main fragmentation loop until the string will not be able to fragment ---- |
---|
[819] | 600 | inner_sucess=true; // set false on failure.. |
---|
[1340] | 601 | |
---|
[819] | 602 | while (! StopFragmenting(currentString) ) |
---|
| 603 | { // Split current string into hadron + new string |
---|
[1340] | 604 | |
---|
[819] | 605 | G4FragmentingString *newString=0; // used as output from SplitUp... |
---|
| 606 | |
---|
| 607 | G4KineticTrack * Hadron=Splitup(currentString,newString); |
---|
[1340] | 608 | //G4cout<<"SplitUp------"<<Hadron<<G4endl; |
---|
[819] | 609 | |
---|
[962] | 610 | if ( Hadron != 0 ) // Store the hadron |
---|
[819] | 611 | { |
---|
[1340] | 612 | //G4cout<<"Hadron prod at fragm. "<<Hadron->GetDefinition()->GetParticleName()<<G4endl; |
---|
[819] | 613 | if ( currentString->GetDecayDirection() > 0 ) |
---|
| 614 | LeftVector->push_back(Hadron); |
---|
| 615 | else |
---|
| 616 | RightVector->push_back(Hadron); |
---|
| 617 | delete currentString; |
---|
| 618 | currentString=newString; |
---|
[962] | 619 | } |
---|
[819] | 620 | }; |
---|
[962] | 621 | // Split remaining string into 2 final Hadrons ------------------------ |
---|
[1340] | 622 | //G4cout<<"Split Last"<<G4endl; |
---|
[962] | 623 | if ( inner_sucess && |
---|
[819] | 624 | SplitLast(currentString,LeftVector, RightVector) ) |
---|
| 625 | { |
---|
| 626 | success=true; |
---|
| 627 | } |
---|
| 628 | delete currentString; |
---|
[962] | 629 | } // End of the loop in attemps to fragment the string |
---|
[819] | 630 | |
---|
| 631 | delete theStringInCMS; |
---|
| 632 | |
---|
| 633 | if ( ! success ) |
---|
| 634 | { |
---|
| 635 | std::for_each(LeftVector->begin(), LeftVector->end(), DeleteKineticTrack()); |
---|
| 636 | LeftVector->clear(); |
---|
| 637 | std::for_each(RightVector->begin(), RightVector->end(), DeleteKineticTrack()); |
---|
| 638 | delete RightVector; |
---|
| 639 | return LeftVector; |
---|
| 640 | } |
---|
| 641 | |
---|
| 642 | // Join Left- and RightVector into LeftVector in correct order. |
---|
| 643 | while(!RightVector->empty()) |
---|
| 644 | { |
---|
| 645 | LeftVector->push_back(RightVector->back()); |
---|
| 646 | RightVector->erase(RightVector->end()-1); |
---|
| 647 | } |
---|
| 648 | delete RightVector; |
---|
| 649 | |
---|
| 650 | CalculateHadronTimePosition(theString.Get4Momentum().mag(), LeftVector); |
---|
| 651 | |
---|
| 652 | G4LorentzRotation toObserverFrame(toCms.inverse()); |
---|
| 653 | |
---|
[962] | 654 | // LeftVector->operator[](0)->SetFormationTime(theString.GetTimeOfCreation()); |
---|
| 655 | // LeftVector->operator[](0)->SetPosition(theString.GetPosition()); |
---|
| 656 | |
---|
| 657 | G4double TimeOftheStringCreation=theString.GetTimeOfCreation(); |
---|
| 658 | G4ThreeVector PositionOftheStringCreation(theString.GetPosition()); |
---|
| 659 | |
---|
[1340] | 660 | //G4cout<<"# prod hadrons "<<LeftVector->size()<<G4endl; |
---|
[819] | 661 | for(size_t C1 = 0; C1 < LeftVector->size(); C1++) |
---|
| 662 | { |
---|
| 663 | G4KineticTrack* Hadron = LeftVector->operator[](C1); |
---|
| 664 | G4LorentzVector Momentum = Hadron->Get4Momentum(); |
---|
[1340] | 665 | //G4cout<<"Hadron "<<Hadron->GetDefinition()->GetParticleName()<<" "<<Momentum<<G4endl; |
---|
[819] | 666 | Momentum = toObserverFrame*Momentum; |
---|
| 667 | Hadron->Set4Momentum(Momentum); |
---|
[962] | 668 | |
---|
[819] | 669 | G4LorentzVector Coordinate(Hadron->GetPosition(), Hadron->GetFormationTime()); |
---|
| 670 | Momentum = toObserverFrame*Coordinate; |
---|
[1337] | 671 | Hadron->SetFormationTime(TimeOftheStringCreation+Momentum.e() |
---|
| 672 | -fermi/c_light); |
---|
[819] | 673 | G4ThreeVector aPosition(Momentum.vect()); |
---|
[962] | 674 | // Hadron->SetPosition(theString.GetPosition()+aPosition); |
---|
| 675 | Hadron->SetPosition(PositionOftheStringCreation+aPosition); |
---|
| 676 | }; |
---|
[819] | 677 | |
---|
| 678 | return LeftVector; |
---|
| 679 | |
---|
[962] | 680 | } |
---|
[819] | 681 | |
---|
[962] | 682 | //---------------------------------------------------------------------------------- |
---|
| 683 | G4bool G4LundStringFragmentation::IsFragmentable(const G4FragmentingString * const string) |
---|
| 684 | { |
---|
[1337] | 685 | SetMinimalStringMass(string); |
---|
[1340] | 686 | // return sqr(MinimalStringMass + WminLUND) < string->Get4Momentum().mag2(); |
---|
| 687 | return MinimalStringMass < string->Get4Momentum().mag(); // 21.07.2010 |
---|
[819] | 688 | } |
---|
| 689 | |
---|
[962] | 690 | //---------------------------------------------------------------------------------------- |
---|
| 691 | G4bool G4LundStringFragmentation::StopFragmenting(const G4FragmentingString * const string) |
---|
| 692 | { |
---|
| 693 | SetMinimalStringMass(string); |
---|
[819] | 694 | |
---|
[1340] | 695 | /* |
---|
| 696 | G4cout<<"StopFragm MinMass "<<MinimalStringMass<<" String Mass "<<string->Get4Momentum().mag()<<G4endl; |
---|
| 697 | G4cout<<"WminLUND "<<WminLUND<<" SmoothParam "<<SmoothParam<<" "<<string->Mass()<<G4endl; |
---|
| 698 | //G4cout<<std::exp(-(string->Mass()*string->Mass()-MinimalStringMass2)/WminLUND/WminLUND)<<G4endl; |
---|
| 699 | //G4int Uzhi; G4cin>>Uzhi; |
---|
| 700 | */ |
---|
| 701 | // |
---|
[962] | 702 | return (MinimalStringMass + WminLUND)* |
---|
| 703 | (1 + SmoothParam * (1.-2*G4UniformRand())) > |
---|
| 704 | string->Mass(); |
---|
[1340] | 705 | // |
---|
| 706 | // return G4UniformRand() < std::exp(-(string->Mass()*string->Mass()-MinimalStringMass2)/WminLUND/WminLUND); |
---|
[819] | 707 | } |
---|
| 708 | |
---|
[962] | 709 | //---------------------------------------------------------------------------------------- |
---|
[819] | 710 | G4bool G4LundStringFragmentation::SplitLast(G4FragmentingString * string, |
---|
| 711 | G4KineticTrackVector * LeftVector, |
---|
| 712 | G4KineticTrackVector * RightVector) |
---|
| 713 | { |
---|
| 714 | //... perform last cluster decay |
---|
[1340] | 715 | //G4cout<<"Split last-----------------------------------------"<<G4endl; |
---|
[962] | 716 | G4LorentzVector Str4Mom=string->Get4Momentum(); |
---|
[1337] | 717 | |
---|
[819] | 718 | G4ThreeVector ClusterVel =string->Get4Momentum().boostVector(); |
---|
| 719 | |
---|
[1340] | 720 | G4double StringMass = string->Mass(); |
---|
| 721 | G4double StringMassSqr= sqr(StringMass); |
---|
[819] | 722 | |
---|
[1340] | 723 | G4ParticleDefinition * LeftHadron(0), * RightHadron(0); |
---|
| 724 | G4double LeftHadronMass(0.), RightHadronMass(0.); |
---|
[962] | 725 | |
---|
[1340] | 726 | G4ParticleDefinition * FS_LeftHadron[25], * FS_RightHadron[25]; |
---|
| 727 | G4double FS_Weight[25]; |
---|
| 728 | G4int NumberOf_FS=0; |
---|
| 729 | |
---|
| 730 | for(G4int i=0; i<25; i++) {FS_Weight[i]=0.;} |
---|
| 731 | //*********************************************** |
---|
| 732 | //G4cout<<"StrMass "<<StringMass<<" q "<<string->GetLeftParton()->GetParticleName()<<" "<<string->GetRightParton()->GetParticleName()<<" StringMassSqr "<<StringMassSqr<<G4endl; |
---|
| 733 | |
---|
| 734 | |
---|
| 735 | string->SetLeftPartonStable(); // to query quark contents.. |
---|
| 736 | |
---|
| 737 | if (string->FourQuarkString() ) |
---|
[819] | 738 | { |
---|
[1340] | 739 | // The string is qq-qqbar type. Diquarks are on the string ends |
---|
| 740 | G4int cClusterInterrupt = 0; |
---|
| 741 | do |
---|
| 742 | { |
---|
| 743 | //G4cout<<"cClusterInterrupt "<<cClusterInterrupt<<G4endl; |
---|
[819] | 744 | if (cClusterInterrupt++ >= ClusterLoopInterrupt) |
---|
| 745 | { |
---|
| 746 | return false; |
---|
| 747 | } |
---|
| 748 | |
---|
[1340] | 749 | G4int LeftQuark1= string->GetLeftParton()->GetPDGEncoding()/1000; |
---|
| 750 | G4int LeftQuark2=(string->GetLeftParton()->GetPDGEncoding()/100)%10; |
---|
| 751 | |
---|
| 752 | G4int RightQuark1= string->GetRightParton()->GetPDGEncoding()/1000; |
---|
| 753 | G4int RightQuark2=(string->GetRightParton()->GetPDGEncoding()/100)%10; |
---|
| 754 | |
---|
| 755 | if(G4UniformRand()<0.5) |
---|
[962] | 756 | { |
---|
[1340] | 757 | LeftHadron =hadronizer->Build(FindParticle( LeftQuark1), |
---|
| 758 | FindParticle(RightQuark1)); |
---|
| 759 | RightHadron=hadronizer->Build(FindParticle( LeftQuark2), |
---|
| 760 | FindParticle(RightQuark2)); |
---|
| 761 | } else |
---|
| 762 | { |
---|
| 763 | LeftHadron =hadronizer->Build(FindParticle( LeftQuark1), |
---|
| 764 | FindParticle(RightQuark2)); |
---|
| 765 | RightHadron=hadronizer->Build(FindParticle( LeftQuark2), |
---|
| 766 | FindParticle(RightQuark1)); |
---|
| 767 | } |
---|
| 768 | |
---|
| 769 | //... repeat procedure, if mass of cluster is too low to produce hadrons |
---|
| 770 | //... ClusterMassCut = 0.15*GeV model parameter |
---|
| 771 | } |
---|
| 772 | while ((StringMass <= LeftHadron->GetPDGMass() + RightHadron->GetPDGMass())); |
---|
[819] | 773 | |
---|
[1340] | 774 | } // End of if (string->FourQuarkString() ) |
---|
[819] | 775 | |
---|
[1340] | 776 | //*********************************************** |
---|
[819] | 777 | |
---|
[1340] | 778 | if (!string->FourQuarkString()) |
---|
| 779 | { |
---|
| 780 | if (string->DecayIsQuark() && string->StableIsQuark() ) |
---|
| 781 | {//... there are quarks on cluster ends |
---|
| 782 | //G4cout<<"Q Q string"<<G4endl; |
---|
| 783 | G4ParticleDefinition * Quark; |
---|
| 784 | G4ParticleDefinition * Anti_Quark; |
---|
[819] | 785 | |
---|
[1340] | 786 | if(string->GetLeftParton()->GetPDGEncoding()>0) |
---|
| 787 | { |
---|
| 788 | Quark =string->GetLeftParton(); |
---|
| 789 | Anti_Quark=string->GetRightParton(); |
---|
[962] | 790 | } else |
---|
[1340] | 791 | { |
---|
| 792 | Quark =string->GetRightParton(); |
---|
| 793 | Anti_Quark=string->GetLeftParton(); |
---|
| 794 | } |
---|
| 795 | |
---|
| 796 | G4int IDquark =Quark->GetPDGEncoding(); |
---|
| 797 | G4int AbsIDquark =std::abs(IDquark); |
---|
| 798 | G4int IDanti_quark =Anti_Quark->GetPDGEncoding(); |
---|
| 799 | G4int AbsIDanti_quark=std::abs(IDanti_quark); |
---|
| 800 | |
---|
| 801 | NumberOf_FS=0; |
---|
| 802 | for(G4int ProdQ=1; ProdQ < 4; ProdQ++) |
---|
[962] | 803 | { |
---|
[1340] | 804 | G4int SignQ=-1; |
---|
| 805 | if(IDquark == 2) SignQ= 1; |
---|
| 806 | if((IDquark == 1) && (ProdQ == 3)) SignQ= 1; // K0 |
---|
| 807 | if((IDquark == 3) && (ProdQ == 1)) SignQ=-1; // K0bar |
---|
| 808 | if(IDquark == ProdQ) SignQ= 1; |
---|
[819] | 809 | |
---|
[1340] | 810 | G4int SignAQ= 1; |
---|
| 811 | if(IDanti_quark == -2) SignAQ=-1; |
---|
| 812 | if((IDanti_quark ==-1) && (ProdQ == 3)) SignAQ=-1; // K0bar |
---|
| 813 | if((IDanti_quark ==-3) && (ProdQ == 1)) SignAQ= 1; // K0 |
---|
| 814 | if(AbsIDanti_quark == ProdQ) SignAQ= 1; |
---|
[819] | 815 | |
---|
[1340] | 816 | G4int StateQ=0; |
---|
| 817 | do // while(Meson[AbsIDquark-1][ProdQ-1][StateQ]<>0); |
---|
| 818 | { |
---|
| 819 | LeftHadron=G4ParticleTable::GetParticleTable()->FindParticle(SignQ* |
---|
| 820 | Meson[AbsIDquark-1][ProdQ-1][StateQ]); |
---|
| 821 | LeftHadronMass=LeftHadron->GetPDGMass(); |
---|
| 822 | StateQ++; |
---|
| 823 | |
---|
| 824 | G4int StateAQ=0; |
---|
| 825 | do // while(Meson[AbsIDanti_quark-1][ProdQ-1][StateAQ]<>0); |
---|
| 826 | { |
---|
| 827 | RightHadron=G4ParticleTable::GetParticleTable()->FindParticle(SignAQ* |
---|
| 828 | Meson[AbsIDanti_quark-1][ProdQ-1][StateAQ]); |
---|
| 829 | RightHadronMass=RightHadron->GetPDGMass(); |
---|
| 830 | StateAQ++; |
---|
| 831 | |
---|
| 832 | if(StringMass >= LeftHadronMass + RightHadronMass) |
---|
[962] | 833 | { |
---|
[1340] | 834 | G4double FS_Psqr=lambda(StringMassSqr,sqr(LeftHadronMass), |
---|
| 835 | sqr(RightHadronMass)); |
---|
| 836 | FS_Weight[NumberOf_FS]=std::sqrt(FS_Psqr)* |
---|
| 837 | MesonWeight[AbsIDquark-1][ProdQ-1][StateQ]* |
---|
| 838 | MesonWeight[AbsIDanti_quark-1][ProdQ-1][StateAQ]* |
---|
| 839 | Prob_QQbar[ProdQ-1]; |
---|
| 840 | |
---|
| 841 | FS_LeftHadron[NumberOf_FS] = LeftHadron; |
---|
| 842 | FS_RightHadron[NumberOf_FS]= RightHadron; |
---|
| 843 | NumberOf_FS++; |
---|
| 844 | if(NumberOf_FS > 24) |
---|
| 845 | {G4int Uzhi; G4cout<<"QQbar string #_FS "<<NumberOf_FS<<G4endl; G4cin>>Uzhi;} |
---|
| 846 | } // End of if(StringMass >= LeftHadronMass + RightHadronMass) |
---|
| 847 | } while(Meson[AbsIDanti_quark-1][ProdQ-1][StateAQ]!=0); |
---|
| 848 | } while(Meson[AbsIDquark-1][ProdQ-1][StateQ]!=0); |
---|
| 849 | } // End of for(G4int ProdQ=1; ProdQ < 4; ProdQ++) |
---|
| 850 | // |
---|
| 851 | } else //--------------------------------------------- |
---|
| 852 | { //... there is a Diquark on one of the cluster ends |
---|
| 853 | //G4cout<<"DiQ Q string"<<G4endl; |
---|
| 854 | G4ParticleDefinition * Di_Quark; |
---|
| 855 | G4ParticleDefinition * Quark; |
---|
| 856 | |
---|
| 857 | if(string->GetLeftParton()->GetParticleSubType()== "quark") |
---|
| 858 | { |
---|
| 859 | Quark =string->GetLeftParton(); |
---|
| 860 | Di_Quark=string->GetRightParton(); |
---|
| 861 | } else |
---|
| 862 | { |
---|
| 863 | Quark =string->GetRightParton(); |
---|
| 864 | Di_Quark=string->GetLeftParton(); |
---|
| 865 | } |
---|
| 866 | |
---|
| 867 | G4int IDquark =Quark->GetPDGEncoding(); |
---|
| 868 | G4int AbsIDquark =std::abs(IDquark); |
---|
| 869 | G4int IDdi_quark =Di_Quark->GetPDGEncoding(); |
---|
| 870 | G4int AbsIDdi_quark=std::abs(IDdi_quark); |
---|
| 871 | G4int Di_q1=AbsIDdi_quark/1000; |
---|
| 872 | G4int Di_q2=(AbsIDdi_quark-Di_q1*1000)/100; |
---|
| 873 | //G4cout<<"IDs "<<IDdi_quark<<" "<<IDquark<<G4endl; |
---|
| 874 | |
---|
| 875 | G4int SignDiQ= 1; |
---|
| 876 | if(IDdi_quark < 0) SignDiQ=-1; |
---|
| 877 | |
---|
| 878 | NumberOf_FS=0; |
---|
| 879 | for(G4int ProdQ=1; ProdQ < 4; ProdQ++) |
---|
| 880 | { |
---|
| 881 | G4int SignQ; |
---|
| 882 | if(IDquark > 0) |
---|
| 883 | { SignQ=-1; |
---|
| 884 | if(IDquark == 2) SignQ= 1; |
---|
| 885 | if((IDquark == 1) && (ProdQ == 3)) SignQ= 1; // K0 |
---|
| 886 | if((IDquark == 3) && (ProdQ == 1)) SignQ=-1; // K0bar |
---|
| 887 | } else |
---|
| 888 | { |
---|
| 889 | SignQ= 1; |
---|
| 890 | if(IDquark == -2) SignQ=-1; |
---|
| 891 | if((IDquark ==-1) && (ProdQ == 3)) SignQ=-1; // K0bar |
---|
| 892 | if((IDquark ==-3) && (ProdQ == 1)) SignQ= 1; // K0 |
---|
| 893 | } |
---|
| 894 | |
---|
| 895 | if(AbsIDquark == ProdQ) SignQ= 1; |
---|
| 896 | |
---|
| 897 | //G4cout<<G4endl; |
---|
| 898 | //G4cout<<"-------------------------------------------"<<G4endl; |
---|
| 899 | //G4cout<<"Insert QQbar "<<ProdQ<<" Sign "<<SignQ<<G4endl; |
---|
| 900 | |
---|
| 901 | G4int StateQ=0; |
---|
| 902 | do // while(Meson[AbsIDquark-1][ProdQ-1][StateQ]<>0); |
---|
| 903 | { |
---|
| 904 | //G4cout<<G4endl<<"AbsIDquark ProdQ StateQ "<<MesonWeight[AbsIDquark-1][ProdQ-1][StateQ]<<" "<<AbsIDquark<<" "<<ProdQ<<" "<<StateQ<<G4endl; |
---|
| 905 | //G4cout<<G4endl<<"AbsIDquark ProdQ StateQ "<<SignQ*Meson[AbsIDquark-1][ProdQ-1][StateQ]<<" "<<AbsIDquark<<" "<<ProdQ<<" "<<StateQ<<G4endl; |
---|
| 906 | LeftHadron=G4ParticleTable::GetParticleTable()->FindParticle(SignQ* |
---|
| 907 | Meson[AbsIDquark-1][ProdQ-1][StateQ]); |
---|
| 908 | LeftHadronMass=LeftHadron->GetPDGMass(); |
---|
| 909 | |
---|
| 910 | //G4cout<<"Meson "<<LeftHadron->GetParticleName()<<G4endl; |
---|
| 911 | |
---|
| 912 | G4int StateDiQ=0; |
---|
| 913 | do // while(Baryon[Di_q1-1][Di_q2-1][ProdQ-1][StateDiQ]<>0); |
---|
| 914 | { |
---|
| 915 | //G4cout<<G4endl<<"Di_q1 Di_q2 ProdQ StateDiQ "<<BaryonWeight[Di_q1-1][Di_q2-1][ProdQ-1][StateDiQ]<<" "<<Di_q1-1<<" "<<Di_q2-1<<" "<<ProdQ-1<<" "<<StateDiQ<<G4endl; |
---|
| 916 | RightHadron=G4ParticleTable::GetParticleTable()->FindParticle(SignDiQ* |
---|
| 917 | Baryon[Di_q1-1][Di_q2-1][ProdQ-1][StateDiQ]); |
---|
| 918 | RightHadronMass=RightHadron->GetPDGMass(); |
---|
| 919 | |
---|
| 920 | //G4cout<<"Baryon "<<RightHadron->GetParticleName()<<G4endl; |
---|
| 921 | |
---|
| 922 | //G4cout<<"StringMass LeftHadronMass RightHadronMass "<<StringMass<<" "<<LeftHadronMass<<" "<< RightHadronMass<<G4endl; |
---|
| 923 | |
---|
| 924 | if(StringMass >= LeftHadronMass + RightHadronMass) |
---|
[962] | 925 | { |
---|
[1340] | 926 | G4double FS_Psqr=lambda(StringMassSqr,sqr(LeftHadronMass), |
---|
| 927 | sqr(RightHadronMass)); |
---|
| 928 | FS_Weight[NumberOf_FS]=std::sqrt(FS_Psqr)* |
---|
| 929 | MesonWeight[AbsIDquark-1][ProdQ-1][StateQ]* |
---|
| 930 | BaryonWeight[Di_q1-1][Di_q2-1][ProdQ-1][StateDiQ]* |
---|
| 931 | Prob_QQbar[ProdQ-1]; |
---|
[1337] | 932 | |
---|
[1340] | 933 | FS_LeftHadron[NumberOf_FS] = LeftHadron; |
---|
| 934 | FS_RightHadron[NumberOf_FS]= RightHadron; |
---|
[962] | 935 | |
---|
[1340] | 936 | //G4cout<<"State "<<NumberOf_FS<<" "<<std::sqrt(FS_Psqr/4./StringMassSqr)<<" "<<std::sqrt(FS_Psqr)<<" "<<FS_Weight[NumberOf_FS]<<G4endl; |
---|
| 937 | //G4cout<<"++++++++++++++++++++++++++++++++"<<G4endl; |
---|
| 938 | NumberOf_FS++; |
---|
[819] | 939 | |
---|
[1340] | 940 | if(NumberOf_FS > 24) |
---|
| 941 | {G4int Uzhi; G4cout<<"QQbar string #_FS "<<NumberOf_FS<<G4endl; G4cin>>Uzhi;} |
---|
| 942 | } // End of if(StringMass >= LeftHadronMass + RightHadronMass) |
---|
| 943 | |
---|
| 944 | StateDiQ++; |
---|
| 945 | //G4cout<<Baryon[Di_q1-1][Di_q2-1][ProdQ-1][StateDiQ]<<" "<<Di_q1-1<<" "<<Di_q2-1<<" "<<ProdQ-1<<" "<<StateDiQ<<G4endl; |
---|
| 946 | } while(Baryon[Di_q1-1][Di_q2-1][ProdQ-1][StateDiQ]!=0); |
---|
| 947 | |
---|
| 948 | StateQ++; |
---|
| 949 | } while(Meson[AbsIDquark-1][ProdQ-1][StateQ]!=0); |
---|
| 950 | } // End of for(G4int ProdQ=1; ProdQ < 4; ProdQ++) |
---|
| 951 | } |
---|
| 952 | //==================================== |
---|
| 953 | |
---|
| 954 | if(NumberOf_FS == 0) return false; |
---|
| 955 | //G4cout<<"NumberOf_FS "<<NumberOf_FS<<G4endl; |
---|
| 956 | G4double SumWeights=0.; |
---|
| 957 | for(G4int i=0; i<NumberOf_FS; i++) {SumWeights+=FS_Weight[i];} |
---|
| 958 | |
---|
| 959 | G4double ksi=G4UniformRand(); |
---|
| 960 | G4double Sum=0.; |
---|
| 961 | G4int SampledState(0); |
---|
| 962 | |
---|
| 963 | for(G4int i=0; i<NumberOf_FS; i++) |
---|
| 964 | { |
---|
| 965 | Sum+=(FS_Weight[i]/SumWeights); |
---|
| 966 | SampledState=i; |
---|
| 967 | if(Sum >= ksi) break; |
---|
| 968 | } |
---|
| 969 | |
---|
| 970 | LeftHadron =FS_LeftHadron[SampledState]; |
---|
| 971 | RightHadron=FS_RightHadron[SampledState]; |
---|
| 972 | |
---|
| 973 | //G4cout<<"Selected "<<SampledState<<" "<<LeftHadron->GetParticleName()<<" "<<RightHadron->GetParticleName()<<G4endl; |
---|
| 974 | |
---|
| 975 | } // End of if(!string->FourQuarkString()) |
---|
| 976 | |
---|
[819] | 977 | G4LorentzVector LeftMom, RightMom; |
---|
| 978 | G4ThreeVector Pos; |
---|
| 979 | |
---|
[962] | 980 | Sample4Momentum(&LeftMom, LeftHadron->GetPDGMass(), |
---|
| 981 | &RightMom, RightHadron->GetPDGMass(), |
---|
[1340] | 982 | StringMass); |
---|
[819] | 983 | |
---|
| 984 | LeftMom.boost(ClusterVel); |
---|
| 985 | RightMom.boost(ClusterVel); |
---|
| 986 | |
---|
| 987 | LeftVector->push_back(new G4KineticTrack(LeftHadron, 0, Pos, LeftMom)); |
---|
| 988 | RightVector->push_back(new G4KineticTrack(RightHadron, 0, Pos, RightMom)); |
---|
| 989 | |
---|
| 990 | return true; |
---|
| 991 | |
---|
| 992 | } |
---|
| 993 | |
---|
| 994 | //---------------------------------------------------------------------------------------------------------- |
---|
| 995 | |
---|
[962] | 996 | void G4LundStringFragmentation::Sample4Momentum(G4LorentzVector* Mom, G4double Mass, G4LorentzVector* AntiMom, G4double AntiMass, G4double InitialMass) |
---|
| 997 | { |
---|
| 998 | // ------ Sampling of momenta of 2 last produced hadrons -------------------- |
---|
| 999 | G4ThreeVector Pt; |
---|
| 1000 | G4double MassMt2, AntiMassMt2; |
---|
| 1001 | G4double AvailablePz, AvailablePz2; |
---|
[1340] | 1002 | |
---|
| 1003 | //G4cout<<"Masses "<<InitialMass<<" "<<Mass<<" "<<AntiMass<<G4endl; |
---|
| 1004 | // |
---|
| 1005 | |
---|
| 1006 | if((Mass > 930. || AntiMass > 930.)) //If there is a baryon |
---|
[962] | 1007 | { |
---|
[1340] | 1008 | // ----------------- Isotropic decay ------------------------------------ |
---|
[962] | 1009 | G4double r_val = sqr(InitialMass*InitialMass - Mass*Mass - AntiMass*AntiMass) - |
---|
| 1010 | sqr(2.*Mass*AntiMass); |
---|
| 1011 | G4double Pabs = (r_val > 0.)? std::sqrt(r_val)/(2.*InitialMass) : 0; |
---|
[1340] | 1012 | //G4cout<<"P for isotr decay "<<Pabs<<G4endl; |
---|
[819] | 1013 | |
---|
[962] | 1014 | //... sample unit vector |
---|
[1340] | 1015 | G4double pz =1. - 2.*G4UniformRand(); |
---|
[962] | 1016 | G4double st = std::sqrt(1. - pz * pz)*Pabs; |
---|
| 1017 | G4double phi = 2.*pi*G4UniformRand(); |
---|
| 1018 | G4double px = st*std::cos(phi); |
---|
| 1019 | G4double py = st*std::sin(phi); |
---|
| 1020 | pz *= Pabs; |
---|
| 1021 | |
---|
| 1022 | Mom->setPx(px); Mom->setPy(py); Mom->setPz(pz); |
---|
| 1023 | Mom->setE(std::sqrt(Pabs*Pabs + Mass*Mass)); |
---|
[819] | 1024 | |
---|
[962] | 1025 | AntiMom->setPx(-px); AntiMom->setPy(-py); AntiMom->setPz(-pz); |
---|
| 1026 | AntiMom->setE (std::sqrt(Pabs*Pabs + AntiMass*AntiMass)); |
---|
[1340] | 1027 | //G4int Uzhi; G4cin>>Uzhi; |
---|
[962] | 1028 | } |
---|
| 1029 | else |
---|
[1340] | 1030 | // |
---|
[962] | 1031 | { |
---|
| 1032 | do |
---|
[1055] | 1033 | { |
---|
| 1034 | // GF 22-May-09, limit sampled pt to allowed range |
---|
| 1035 | |
---|
| 1036 | G4double termD = InitialMass*InitialMass -Mass*Mass - AntiMass*AntiMass; |
---|
| 1037 | G4double termab = 4*sqr(Mass*AntiMass); |
---|
| 1038 | G4double termN = 2*termD + 4*Mass*Mass + 4*AntiMass*AntiMass; |
---|
| 1039 | G4double pt2max=(termD*termD - termab )/ termN ; |
---|
[1340] | 1040 | //G4cout<<"Anis "<<pt2max<<" "<<(termD*termD-termab)/(4.*InitialMass*InitialMass)<<G4endl; |
---|
[1337] | 1041 | |
---|
[1196] | 1042 | Pt=SampleQuarkPt(std::sqrt(pt2max)); Pt.setZ(0); G4double Pt2=Pt.mag2(); |
---|
[1340] | 1043 | //G4cout<<"Sampl pt2 "<<Pt2<<G4endl; |
---|
[962] | 1044 | MassMt2 = Mass * Mass + Pt2; |
---|
| 1045 | AntiMassMt2= AntiMass * AntiMass + Pt2; |
---|
[819] | 1046 | |
---|
[962] | 1047 | AvailablePz2= sqr(InitialMass*InitialMass - MassMt2 - AntiMassMt2) - |
---|
| 1048 | 4.*MassMt2*AntiMassMt2; |
---|
| 1049 | } |
---|
[1055] | 1050 | while(AvailablePz2 < 0.); // GF will occur only for numerical precision problem with limit in sampled pt |
---|
[962] | 1051 | |
---|
| 1052 | AvailablePz2 /=(4.*InitialMass*InitialMass); |
---|
| 1053 | AvailablePz = std::sqrt(AvailablePz2); |
---|
[819] | 1054 | |
---|
[962] | 1055 | G4double Px=Pt.getX(); |
---|
| 1056 | G4double Py=Pt.getY(); |
---|
[819] | 1057 | |
---|
[962] | 1058 | Mom->setPx(Px); Mom->setPy(Py); Mom->setPz(AvailablePz); |
---|
| 1059 | Mom->setE(std::sqrt(MassMt2+AvailablePz2)); |
---|
| 1060 | |
---|
| 1061 | AntiMom->setPx(-Px); AntiMom->setPy(-Py); AntiMom->setPz(-AvailablePz); |
---|
| 1062 | AntiMom->setE (std::sqrt(AntiMassMt2+AvailablePz2)); |
---|
| 1063 | } |
---|
| 1064 | } |
---|
[819] | 1065 | |
---|
[962] | 1066 | //----------------------------------------------------------------------------- |
---|
[819] | 1067 | |
---|
[962] | 1068 | G4LorentzVector * G4LundStringFragmentation::SplitEandP(G4ParticleDefinition * pHadron, |
---|
| 1069 | G4FragmentingString * string, G4FragmentingString * newString) |
---|
| 1070 | { |
---|
[1340] | 1071 | //G4cout<<"Start SplitEandP "<<G4endl; |
---|
[962] | 1072 | G4LorentzVector String4Momentum=string->Get4Momentum(); |
---|
| 1073 | G4double StringMT2=string->Get4Momentum().mt2(); |
---|
[819] | 1074 | |
---|
[962] | 1075 | G4double HadronMass = pHadron->GetPDGMass(); |
---|
[819] | 1076 | |
---|
[1340] | 1077 | SetMinimalStringMass(newString); |
---|
| 1078 | //G4cout<<"HadM MinimalStringMassLeft StringM "<<HadronMass<<" "<<MinimalStringMass<<" "<<String4Momentum.mag()<<G4endl; |
---|
| 1079 | |
---|
| 1080 | if(HadronMass + MinimalStringMass > String4Momentum.mag()) {return 0;}// have to start all over! |
---|
[962] | 1081 | String4Momentum.setPz(0.); |
---|
| 1082 | G4ThreeVector StringPt=String4Momentum.vect(); |
---|
[819] | 1083 | |
---|
[962] | 1084 | // calculate and assign hadron transverse momentum component HadronPx and HadronPy |
---|
| 1085 | G4ThreeVector thePt; |
---|
| 1086 | thePt=SampleQuarkPt(); |
---|
[819] | 1087 | |
---|
[962] | 1088 | G4ThreeVector HadronPt = thePt +string->DecayPt(); |
---|
| 1089 | HadronPt.setZ(0); |
---|
[819] | 1090 | |
---|
[962] | 1091 | G4ThreeVector RemSysPt = StringPt - HadronPt; |
---|
[819] | 1092 | |
---|
[962] | 1093 | //... sample z to define hadron longitudinal momentum and energy |
---|
| 1094 | //... but first check the available phase space |
---|
[819] | 1095 | |
---|
[962] | 1096 | G4double HadronMassT2 = sqr(HadronMass) + HadronPt.mag2(); |
---|
| 1097 | G4double ResidualMassT2=sqr(MinimalStringMass) + RemSysPt.mag2(); |
---|
[819] | 1098 | |
---|
[962] | 1099 | G4double Pz2 = (sqr(StringMT2 - HadronMassT2 - ResidualMassT2) - |
---|
| 1100 | 4*HadronMassT2 * ResidualMassT2)/4./StringMT2; |
---|
[1340] | 1101 | //G4cout<<"Pz2 "<<Pz2<<G4endl; |
---|
[962] | 1102 | if(Pz2 < 0 ) {return 0;} // have to start all over! |
---|
[819] | 1103 | |
---|
[962] | 1104 | //... then compute allowed z region z_min <= z <= z_max |
---|
| 1105 | |
---|
| 1106 | G4double Pz = std::sqrt(Pz2); |
---|
| 1107 | G4double zMin = (std::sqrt(HadronMassT2+Pz2) - Pz)/std::sqrt(StringMT2); |
---|
| 1108 | G4double zMax = (std::sqrt(HadronMassT2+Pz2) + Pz)/std::sqrt(StringMT2); |
---|
[819] | 1109 | |
---|
[1340] | 1110 | //G4cout<<"if (zMin >= zMax) return 0 "<<zMin<<" "<<zMax<<G4endl; |
---|
[962] | 1111 | if (zMin >= zMax) return 0; // have to start all over! |
---|
| 1112 | |
---|
| 1113 | G4double z = GetLightConeZ(zMin, zMax, |
---|
| 1114 | string->GetDecayParton()->GetPDGEncoding(), pHadron, |
---|
| 1115 | HadronPt.x(), HadronPt.y()); |
---|
[1340] | 1116 | //G4cout<<"z "<<z<<G4endl; |
---|
[962] | 1117 | //... now compute hadron longitudinal momentum and energy |
---|
| 1118 | // longitudinal hadron momentum component HadronPz |
---|
[819] | 1119 | |
---|
[962] | 1120 | HadronPt.setZ(0.5* string->GetDecayDirection() * |
---|
| 1121 | (z * string->LightConeDecay() - |
---|
| 1122 | HadronMassT2/(z * string->LightConeDecay()))); |
---|
[819] | 1123 | |
---|
[962] | 1124 | G4double HadronE = 0.5* (z * string->LightConeDecay() + |
---|
| 1125 | HadronMassT2/(z * string->LightConeDecay())); |
---|
[819] | 1126 | |
---|
[962] | 1127 | G4LorentzVector * a4Momentum= new G4LorentzVector(HadronPt,HadronE); |
---|
[1340] | 1128 | //G4cout<<"Out SplitEandP "<<G4endl; |
---|
[962] | 1129 | return a4Momentum; |
---|
[819] | 1130 | } |
---|
| 1131 | |
---|
[962] | 1132 | //----------------------------------------------------------------------------------------- |
---|
| 1133 | G4double G4LundStringFragmentation::GetLightConeZ(G4double zmin, G4double zmax, |
---|
| 1134 | G4int PDGEncodingOfDecayParton, |
---|
| 1135 | G4ParticleDefinition* pHadron, |
---|
| 1136 | G4double Px, G4double Py) |
---|
[819] | 1137 | { |
---|
[962] | 1138 | G4double alund; |
---|
[819] | 1139 | |
---|
[962] | 1140 | // If blund get restored, you MUST adapt the calculation of zOfMaxyf. |
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| 1141 | // const G4double blund = 1; |
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| 1142 | |
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| 1143 | G4double z, yf; |
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| 1144 | G4double Mass = pHadron->GetPDGMass(); |
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| 1145 | // G4int HadronEncoding=pHadron->GetPDGEncoding(); |
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| 1146 | |
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| 1147 | G4double Mt2 = Px*Px + Py*Py + Mass*Mass; |
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| 1148 | |
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| 1149 | if(std::abs(PDGEncodingOfDecayParton) < 1000) |
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| 1150 | { |
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| 1151 | // ---------------- Quark fragmentation ---------------------- |
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| 1152 | alund=0.35/GeV/GeV; // Instead of 0.7 because kinks are not considered |
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| 1153 | G4double zOfMaxyf=alund*Mt2/(alund*Mt2 + 1.); |
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| 1154 | G4double maxYf=(1-zOfMaxyf)/zOfMaxyf * std::exp(-alund*Mt2/zOfMaxyf); |
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| 1155 | |
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| 1156 | do |
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| 1157 | { |
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| 1158 | z = zmin + G4UniformRand()*(zmax-zmin); |
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| 1159 | // yf = std::pow(1. - z, blund)/z*std::exp(-alund*Mt2/z); |
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| 1160 | yf = (1-z)/z * std::exp(-alund*Mt2/z); |
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| 1161 | } |
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| 1162 | while (G4UniformRand()*maxYf > yf); |
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| 1163 | } |
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| 1164 | else |
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| 1165 | { |
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| 1166 | // ---------------- Di-quark fragmentation ---------------------- |
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| 1167 | alund=0.7/GeV/GeV; // 0.7 2.0 |
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| 1168 | G4double zOfMaxyf=alund*Mt2/(alund*Mt2 + 1.); |
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| 1169 | G4double maxYf=(1-zOfMaxyf)/zOfMaxyf * std::exp(-alund*Mt2/zOfMaxyf); |
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| 1170 | do |
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| 1171 | { |
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| 1172 | z = zmin + G4UniformRand()*(zmax-zmin); |
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| 1173 | // yf = std::pow(1. - z, blund)/z*std::exp(-alund*Mt2/z); |
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| 1174 | yf = (1-z)/z * std::exp(-alund*Mt2/z); |
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| 1175 | } |
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| 1176 | while (G4UniformRand()*maxYf > yf); |
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| 1177 | }; |
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| 1178 | |
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| 1179 | return z; |
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| 1180 | } |
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[1340] | 1181 | |
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| 1182 | //------------------------------------------------------------------------ |
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| 1183 | G4double G4LundStringFragmentation::lambda(G4double s, G4double m1_Sqr, G4double m2_Sqr) |
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| 1184 | { |
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| 1185 | G4double lam = sqr(s - m1_Sqr - m2_Sqr) - 4.*m1_Sqr*m2_Sqr; |
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| 1186 | return lam; |
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| 1187 | } |
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| 1188 | |
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