Gabriele Cosmo
544 lines
22 KiB
C++
544 lines
22 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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//
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#include "G4Reggeons.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4Pow.hh"
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#include "G4Exp.hh"
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#include "G4Log.hh"
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G4Reggeons::G4Reggeons(const G4ParticleDefinition * particle)
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{
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// Kaidalov&Piskunova Orig
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Alpha_pomeron = 1.12; //0.9808;
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Alphaprime_pomeron = 0.22/GeV/GeV; //0.25/GeV/GeV;
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S0_pomeron = 1.0*GeV*GeV; //2.7*GeV*GeV;
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Alpha_pomeronHard = 1.47;
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Gamma_pomeronHard = 0.0/GeV/GeV;
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G4int PDGcode = particle->GetPDGEncoding();
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G4int absPDGcode = std::abs(PDGcode);
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//-------------------------------------------------------
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// Kaidalov&Piskunova Orig
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G4double C_pomeron_NN = 1.5;
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G4double C_pomeron_N = std::sqrt(C_pomeron_NN);
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G4double Gamma_pomeron_NN = 2.14/GeV/GeV; //(2.6+3.96)
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G4double Gamma_pomeron_N = std::sqrt(Gamma_pomeron_NN);
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G4double Gamma_pomeron_Pr(0.), Gamma_pomeron_Tr(0.);
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G4double Rsquare_pomeron_NN = 3.30/GeV/GeV; //3.56
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G4double Rsquare_pomeron_N = Rsquare_pomeron_NN/2.;
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G4double Rsquare_pomeron_Pr(0.), Rsquare_pomeron_Tr(0.);
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//-------------------------------------------------------
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// Copied from G4HadronNucleonXsc::HyperonNucleonXscNS(...)
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G4double coeff = 1.0;
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static const G4double lBarCof1S = 0.88;
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static const G4double lBarCof2S = 0.76;
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static const G4double lBarCof3S = 0.64;
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static const G4double lBarCof1C = 0.784378;
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static const G4double lBarCofSC = 0.664378;
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static const G4double lBarCof2SC = 0.544378;
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static const G4double lBarCof1B = 0.740659;
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static const G4double lBarCofSB = 0.620659;
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static const G4double lBarCof2SB = 0.500659;
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// End of Copied from G4HadronNucleonXsc::HyperonNucleonXscNS(...)
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// Copied from G4HadronNucleonXsc::SCBMesonNucleonXscNS(...)
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static const G4double llMesCof1C = 0.676568;
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static const G4double llMesCof1B = 0.610989;
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static const G4double llMesCof2C = 0.353135;
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static const G4double llMesCof2B = 0.221978;
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static const G4double llMesCofSC = 0.496568;
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static const G4double llMesCofSB = 0.430989;
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static const G4double llMesCofCB = 0.287557;
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static const G4double llMesCofEtaP = 0.88;
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static const G4double llMesCofEta = 0.76;
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// End of Copied from G4HadronNucleonXsc::SCBMesonNucleonXscNS(...)
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if ( absPDGcode > 1000 ) { // Projectile is baryon or anti_baryon --------
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Cpr_pomeron = C_pomeron_N; // Shower enhancement coefficient for projectile
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Ctr_pomeron = C_pomeron_N; // Shower enhancement coefficient for target
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C_pomeron = Cpr_pomeron*Ctr_pomeron;
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Gamma_pomeron_Pr = Gamma_pomeron_N; // vertex constant for projectile
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Gamma_pomeron_Tr = Gamma_pomeron_N; // vertex constant for target
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Gamma_pomeron = Gamma_pomeron_Pr * Gamma_pomeron_Tr;
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Rsquare_pomeron_Pr = Rsquare_pomeron_N; // R^2 of pomeron-projectile interaction
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Rsquare_pomeron_Tr = Rsquare_pomeron_N; // R^2 of pomeron-target interaction
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Rsquare_pomeron = Rsquare_pomeron_Pr + Rsquare_pomeron_Tr;
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Freggeon_Alpha = 0.7; // Intersept of f-trajectory
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Freggeon_Alphaprime = 0.8/GeV/GeV; // Slope of f-trajectory
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Freggeon_Gamma = sqr(2.871)/GeV/GeV; // Vertex constant of f-meson - nucleon interactions
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Freggeon_Rsquare = 2*0.916/GeV/GeV; // R^2 of f-meson - nucleon interactions
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Freggeon_C = 1.0; // Shower enhancement coefficient
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FParity = +1; // Parity of the trajectory
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Wreggeon_Alpha = 0.4; // Intersept of omega-trajectory (w)
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Wreggeon_Alphaprime = 0.9/GeV/GeV; // Slope of w-trajectory
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Wreggeon_Gamma = sqr(2.241)/GeV/GeV; // Vertex constant of w-meson - nucleon interactions
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Wreggeon_Rsquare = 2*0.945/GeV/GeV *0.5; // R^2 of w-meson - nucleon interactions
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Wreggeon_C = 1.0; // Shower enhancement coefficient
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if (PDGcode > 0) WParity = -1; // Parity +1 for Pbar P, and -1 for PP interactions
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if (PDGcode < 0) WParity = +1;
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// Copied from G4HadronNucleonXsc::HyperonNucleonXscNS(...)
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if ( PDGcode == 3122 || PDGcode == 3222 || // Lambda or Sigma+ or
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PDGcode == 3112 || PDGcode == 3212 || // Sigma- or Sigma0 or
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PDGcode ==-3122 || PDGcode ==-3222 || // anti_Lambda or anti_Sigma+ or
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PDGcode ==-3112 || PDGcode ==-3212 ) { // anti_Sigma- or anti_Sigma0
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coeff = lBarCof1S;
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}
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if ( PDGcode == 3312 || PDGcode == 3322 || // Xi- or Xi0 or
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PDGcode ==-3312 || PDGcode ==-3322 ) { // anti_Xi- or anti_Xi0
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coeff = lBarCof2S;
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}
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if ( PDGcode == 3334 || PDGcode ==-3334 ) { // Omega- or anti_Omega-
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coeff = lBarCof3S;
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}
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if ( PDGcode == 4122 || PDGcode ==-4122 || // Lambda_c+ or anti_Lambda_c+ or
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PDGcode == 4222 || PDGcode ==-4222 || // Sigma_c++ or anti_Sigma_c++ or
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PDGcode == 4212 || PDGcode ==-4212 || // Sigma_c+ or anti_Sigma_c+ or
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PDGcode == 4112 || PDGcode ==-4112 ) { // Sigma_c0 or anti_Sigma_c0
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coeff = lBarCof1C;
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}
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if ( PDGcode == 4332 || PDGcode ==-4332 ) { // Omega_c0 or anti_Omega_c0
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coeff = lBarCof2SC;
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}
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if ( PDGcode == 4232 || PDGcode == 4132 || // Xi_c+ or Xi_c0 or
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PDGcode ==-4232 || PDGcode ==-4132 ) { // anti_Xi_c+ or anti_Xi_c0
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coeff = lBarCofSC;
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}
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if ( PDGcode == 5122 || PDGcode ==-5122 || // Lambda_b0 or anti_Lambda_b0 or
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PDGcode == 5222 || PDGcode ==-5222 || // Sigma_b+ or anti_Sigma_b+ or
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PDGcode == 5112 || PDGcode ==-5112 || // Sigma_b- or anti_Sigma_b- or
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PDGcode == 5212 || PDGcode ==-5212 ) { // Sigma_b0 or anti_Sigma_b0
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coeff = lBarCof1B;
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}
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if ( PDGcode == 5332 || PDGcode ==-5332 ) { // Omega_b- or anti_Omega_b-
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coeff = lBarCof2SB;
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}
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if ( PDGcode == 5132 || PDGcode == 5232 || // Xi_b- or Xi_b0 or
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PDGcode ==-5132 || PDGcode ==-5232 ) { // anti_Xi_b- or anti_Xi_b0
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coeff = lBarCofSB;
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}
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// End of Copied from G4HadronNucleonXsc::HyperonNucleonXscNS(...)
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Gamma_pomeron_Pr *= coeff;
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} else if ( absPDGcode == 211 || PDGcode == 111 || absPDGcode >= 400 ) { // Projectile is a nonstrange meson
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Cpr_pomeron = 1.352;
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Ctr_pomeron = C_pomeron_N;
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C_pomeron = Cpr_pomeron*Ctr_pomeron;
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// KP
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Gamma_pomeron_Pr = 0.89/GeV; // 0.85 -> 0.89 // Uzhi
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Gamma_pomeron_Tr = Gamma_pomeron_N;
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Gamma_pomeron = Gamma_pomeron_Pr * Gamma_pomeron_Tr;
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Rsquare_pomeron_Pr = 0.5/GeV/GeV;
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Rsquare_pomeron_Tr = Rsquare_pomeron_N;
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Rsquare_pomeron = Rsquare_pomeron_Pr + Rsquare_pomeron_Tr;
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Freggeon_Alpha = 0.7;
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Freggeon_Alphaprime = 0.8/GeV/GeV;
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Freggeon_Gamma = 3.524/GeV/GeV;
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Freggeon_Rsquare = 1.0/GeV/GeV;
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Freggeon_C = 1.0;
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FParity = +1;
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Wreggeon_Alpha = 0.5;
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Wreggeon_Gamma = 0.56/GeV/GeV; // 1.12 -> 0.56 Uzhi
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Wreggeon_Rsquare = 9.19/GeV/GeV;
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Wreggeon_Alphaprime = 0.9/GeV/GeV;
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Wreggeon_C = 1.0;
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if (PDGcode > 0) WParity = -1;
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if (PDGcode < 0) WParity = +1;
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// Copied from G4HadronNucleonXsc::SCBMesonNucleonXscNS(...)
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if ( PDGcode == 511 || PDGcode ==-511 || // B0 or anti_B0 or
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PDGcode == 521 || PDGcode ==-521 ) { // B+ or B-
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coeff = llMesCof1B;
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}
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if ( PDGcode == 421 || PDGcode ==-421 || // D0 or anti_D0 or
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PDGcode == 411 || PDGcode ==-411 ) { // D+ or D-
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coeff = llMesCof1C;
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}
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if ( PDGcode == 531 || PDGcode ==-531 ) { // Bs0 or anti_Bs0 or
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coeff = llMesCofSB;
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}
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if ( PDGcode == 541 || PDGcode ==-541 ) { // Bc+ or Bc-
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coeff = llMesCofCB;
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}
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if ( PDGcode == 431 || PDGcode ==-431 ) { // D_s+ or D_s-
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coeff = llMesCofSC;
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}
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if ( PDGcode == 441 || PDGcode == 443 ) { // Eta_c or J/psi
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coeff = llMesCof2C;
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}
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if ( PDGcode == 553 ) { // Upsilon
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coeff = llMesCof2B;
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}
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if ( PDGcode == 221 ) { // Eta
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coeff = llMesCofEta;
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}
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if ( PDGcode == 331 ) { // Eta'
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coeff = llMesCofEtaP;
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}
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// End of Copied from G4HadronNucleonXsc::SCBMesonNucleonXscNS(...)
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Gamma_pomeron_Pr *= coeff;
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} else if ( absPDGcode == 321 || absPDGcode == 311 ||
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PDGcode == 130 || PDGcode == 310 ) { // Projectile is a Kaon
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Cpr_pomeron = 1.522;
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Ctr_pomeron = C_pomeron_N;
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C_pomeron = Cpr_pomeron*Ctr_pomeron;
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Gamma_pomeron_Pr = 0.90/GeV;
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Gamma_pomeron_Tr = Gamma_pomeron_N;
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Gamma_pomeron = Gamma_pomeron_Pr * Gamma_pomeron_Tr;
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Rsquare_pomeron_Pr = 0.31/GeV/GeV;
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Rsquare_pomeron_Tr = Rsquare_pomeron_N;
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Rsquare_pomeron = Rsquare_pomeron_Pr + Rsquare_pomeron_Tr;
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Freggeon_Alpha = 0.7;
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Freggeon_Alphaprime = 0.8/GeV/GeV;
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Freggeon_Gamma = 1.32/GeV/GeV;
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Freggeon_Rsquare = 0.5/GeV/GeV;
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Freggeon_C = 1.0;
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FParity = +1;
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Wreggeon_Alpha = 0.4;
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Wreggeon_Alphaprime = 0.9 /GeV/GeV;
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Wreggeon_Gamma = 1.68/GeV/GeV;
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Wreggeon_Rsquare = 9.19/GeV/GeV;
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Wreggeon_C = 1.0;
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if (PDGcode > 0) WParity = -1;
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if (PDGcode < 0) WParity = +1;
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} else if ( absPDGcode == 22 ) { // Projectile is Gamma
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Cpr_pomeron = 1.437;
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Ctr_pomeron = C_pomeron_N;
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C_pomeron = Cpr_pomeron*Ctr_pomeron;
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Gamma_pomeron_Pr = 0.0035/GeV; // 1.415
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Gamma_pomeron_Tr = Gamma_pomeron_N;
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Gamma_pomeron = Gamma_pomeron_Pr * Gamma_pomeron_Tr;
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Rsquare_pomeron_Pr = 0.51/GeV/GeV;
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Rsquare_pomeron_Tr = Rsquare_pomeron_N;
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Rsquare_pomeron = Rsquare_pomeron_Pr + Rsquare_pomeron_Tr;
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Freggeon_Alpha = 0.7;
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Freggeon_Alphaprime = 0.8/GeV/GeV;
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Freggeon_Gamma = 0.011/GeV/GeV;
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Freggeon_Rsquare = 0.5/GeV/GeV;
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Freggeon_C = 1.0;
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FParity = +1;
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Wreggeon_Alpha = 0.;
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Wreggeon_Alphaprime = 0.9/GeV/GeV;
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Wreggeon_Gamma = 0.01/GeV/GeV;
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Wreggeon_Rsquare = 1.0/GeV/GeV;
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Wreggeon_C = 1.0;
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WParity = +1;
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} else { // Projectile is undefined, Nucleon assumed
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Cpr_pomeron = C_pomeron_N;
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Ctr_pomeron = C_pomeron_N;
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C_pomeron = Cpr_pomeron*Ctr_pomeron;
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Gamma_pomeron_Pr = Gamma_pomeron_N;
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Gamma_pomeron_Tr = Gamma_pomeron_N;
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Gamma_pomeron = Gamma_pomeron_Pr * Gamma_pomeron_Tr;
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Rsquare_pomeron_Pr = Rsquare_pomeron_N;
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Rsquare_pomeron_Tr = Rsquare_pomeron_N;
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Rsquare_pomeron = Rsquare_pomeron_Pr + Rsquare_pomeron_Tr;
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Freggeon_Alpha = 0.723;
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Freggeon_Gamma = 8.801/GeV/GeV;
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Freggeon_Rsquare = 0.396/GeV/GeV;
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Freggeon_Alphaprime = 1.324/GeV/GeV;
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Freggeon_C = 1.0;
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FParity = +1;
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Wreggeon_Alpha = 0.353;
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Wreggeon_Gamma = 8.516/GeV/GeV;
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Wreggeon_Rsquare = 24.40/GeV/GeV;
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Wreggeon_Alphaprime = 1.5/GeV/GeV;
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Wreggeon_C = 1.0;
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WParity = -1;
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}
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chiPin=0.;
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Xtotal =0.; XtotalP=0.; XtotalR=0.;
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Xelastic=0.; Xpr_Diff=0.; Xtr_Diff=0.; XDDiff=0.;
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Xinel =0.; Xnd=0.; XndP=0.; XndR=0.;
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/*
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G4cout<<G4endl<<"Reggeon's parameters for Particle "<<particle->GetParticleName()<<" "<<PDGcode<<G4endl<<G4endl;
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G4cout<<"Alpha_pomeron "<<Alpha_pomeron;
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G4cout<<" Alphaprime_pomeron "<<Alphaprime_pomeron*GeV*GeV;
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G4cout<<" S0_pomeron "<<S0_pomeron/GeV/GeV<<G4endl;
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G4cout<<"Gamma_pomeron "<<Gamma_pomeron*GeV*GeV;
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G4cout<<" Rsquare_pomeron "<<Rsquare_pomeron*GeV*GeV;
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G4cout<<" C_pomeron "<<C_pomeron<<G4endl<<G4endl;
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G4int Uzhi; G4cin>>Uzhi;
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*/
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}
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G4double G4Reggeons::Get_Cprojectile() {return Cpr_pomeron;}
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G4double G4Reggeons::Get_Ctarget() {return Ctr_pomeron;}
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G4Reggeons::~G4Reggeons() {}
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void G4Reggeons::SetS(G4double S) {Sint = S;}
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void G4Reggeons::CalculateXs()
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{
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Xtotal =0.; XtotalP=0.; XtotalR=0.;
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Xelastic=0.; Xpr_Diff=0.; Xtr_Diff=0.; XDDiff=0.; G4double XDiff=0.;
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Xinel =0.; Xnd=0.; XndP=0.; XndR=0.;
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G4double AmplitudeP(0.), AmplitudeR(0.);
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G4double B_max = 10.*fermi;
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G4double dB = B_max/10000.;
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G4double B =-dB/2.;
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G4double chiP(0.), chiR(0.), chiRin(0.); // chiPin Pomeron inelastic phase is a data member
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chiPin=0.;
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for(G4int i=0; i<10000;i++)
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{
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B += dB;
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chiP = Chi_pomeron(1.,B); chiR = Chi_reggeon(1.,B);
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chiPin = Chi_pomeron(2.,B); chiRin = Chi_reggeon(2.,B);
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AmplitudeP = (1.0/C_pomeron)*(1.0 - G4Exp(-chiP))*G4Exp(-chiR);
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AmplitudeR = (1.0 - G4Exp(-chiR));
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Xtotal += 2 * (AmplitudeP + AmplitudeR) * B * dB;
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XtotalP += 2 * (AmplitudeP + 0. ) * B * dB;
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XtotalR += 2 * (0. + AmplitudeR) * B * dB;
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Xelastic += sqr(AmplitudeP + AmplitudeR) * B * dB;
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Xpr_Diff += (Cpr_pomeron - 1.0) * sqr(AmplitudeP) * B * dB;
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Xtr_Diff += (Ctr_pomeron - 1.0) * sqr(AmplitudeP) * B * dB;
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XDiff += (Cpr_pomeron - 1.0) * (Ctr_pomeron - 1.0) * sqr(AmplitudeP) * B * dB;
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// ----------------------------------
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AmplitudeP = (1.0/C_pomeron)*(1.0 - G4Exp(-chiPin))*G4Exp(-chiRin);
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AmplitudeR = (1.0 - G4Exp(-chiRin));
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Xnd += (AmplitudeP + AmplitudeR) * B * dB;
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XndP += (AmplitudeP + 0. ) * B * dB;
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XndR += (0. + AmplitudeR) * B * dB;
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}
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Xtotal *=twopi; XtotalP *=twopi; XtotalR *=twopi;
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Xelastic *=twopi; Xpr_Diff *=twopi; Xtr_Diff *=twopi; XDiff *=twopi;
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Xinel = Xtotal - Xelastic;
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(void)Xinel; // To avoid compiler warning "variable not used"
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|
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Xnd *=twopi; XndP *=twopi; XndR *=twopi;
|
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XDDiff = XDiff-Xpr_Diff-Xtr_Diff;
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|
|
|
/*
|
|
G4cout<<"Total totalP totalR "<<Xtotal/millibarn <<" "<<XtotalP/millibarn <<" "<<XtotalR/millibarn<<" mb"<<G4endl;
|
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G4cout<<"Elastic "<<Xelastic/millibarn <<G4endl;
|
|
G4cout<<"PrDiff TrDiff W_Diff "<<Xpr_Diff/millibarn<<" "<<Xtr_Diff/millibarn<<" "<<XDiff/millibarn<<G4endl;
|
|
G4cout<<"Inelastic "<<Xinel/millibarn <<G4endl;
|
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G4cout<<"NonDiff Pom & Reg "<<Xnd/millibarn <<" "<<XndP/millibarn <<" "<<XndR/millibarn <<G4endl;
|
|
*/
|
|
}
|
|
|
|
|
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G4double G4Reggeons::Chi_pomeron(G4double Mult, G4double B)
|
|
{
|
|
G4double R2 = Rsquare_pomeron + Alphaprime_pomeron * G4Log(Sint/S0_pomeron);
|
|
G4double Eikonal = Mult * C_pomeron * Gamma_pomeron/R2 *
|
|
G4Pow::GetInstance()->powA(Sint/S0_pomeron, Alpha_pomeron -1.) *
|
|
G4Exp(-sqr(B)/4.0/R2/hbarc_squared);
|
|
return Eikonal;
|
|
}
|
|
|
|
|
|
G4double G4Reggeons::Chi_reggeon(G4double Mult, G4double B)
|
|
{
|
|
G4double R2F = Freggeon_Rsquare + Freggeon_Alphaprime * G4Log(Sint/S0_pomeron);
|
|
G4double R2W = Wreggeon_Rsquare + Wreggeon_Alphaprime * G4Log(Sint/S0_pomeron);
|
|
|
|
G4double Eikonal = Mult * FParity * Freggeon_C * Freggeon_Gamma/R2F *
|
|
G4Pow::GetInstance()->powA(Sint/S0_pomeron, Freggeon_Alpha -1.) *
|
|
G4Exp(-sqr(B)/4.0/R2F/hbarc_squared);
|
|
|
|
Eikonal+= Mult * WParity * Wreggeon_C * Wreggeon_Gamma/R2W *
|
|
G4Pow::GetInstance()->powA(Sint/S0_pomeron, Wreggeon_Alpha -1.) *
|
|
G4Exp(-sqr(B)/4.0/R2W/hbarc_squared);
|
|
return Eikonal;
|
|
}
|
|
|
|
|
|
G4double G4Reggeons::GetTotalX() { return Xtotal; }
|
|
G4double G4Reggeons::GetTotalXp() { return XtotalP; }
|
|
G4double G4Reggeons::GetTotalXr() { return XtotalR; }
|
|
|
|
G4double G4Reggeons::GetElasticX(){ return Xelastic; }
|
|
G4double G4Reggeons::GetPrDiffX() { return Xpr_Diff; }
|
|
G4double G4Reggeons::GetTrDiffX() { return Xtr_Diff; }
|
|
G4double G4Reggeons::GetDDiffX() { return XDDiff; }
|
|
|
|
G4double G4Reggeons::GetInelX() { return Xinel; }
|
|
|
|
G4double G4Reggeons::GetND_X() { return Xnd; }
|
|
G4double G4Reggeons::GetNDp_X() { return XndP; }
|
|
G4double G4Reggeons::GetNDr_X() { return XndR; }
|
|
|
|
|
|
//----------------------------------------------------------------------------------------------
|
|
void G4Reggeons::GetProbabilities(G4double B, G4int Mode,
|
|
G4double & Pint,
|
|
G4double & Pprd, G4double & Ptrd, G4double & Pdd,
|
|
G4double & Pnd, G4double & Pnvr)
|
|
{
|
|
// Puprose of the method is a calculation of inelastic interaction probability (Pint),
|
|
// probability of projectile diffraction (Pprd),
|
|
// probability of target diffraction (Ptrd),
|
|
// probability of double diffraction (Pdd ),
|
|
// probability of non-diffractive inter. (Pnd ),
|
|
// probability of quark-exc. inter. (Pnvr),
|
|
// number of cutted pomerons (NcutPomerons).
|
|
// The input parameters are B - impact parameter, and Mode = All/WITHOUT_R/NON_DIFF
|
|
//
|
|
if ( B > 2.* fermi ) { Pint=0.; Pprd=0.; Ptrd=0.; Pdd=0.; Pnd=0.; Pnvr=0.; return;}
|
|
// At large B for hN collisions it is better to return zero inter. probability
|
|
|
|
G4double chiP = Chi_pomeron(1.,B); G4double chiR = Chi_reggeon(1.,B);
|
|
chiPin = Chi_pomeron(2.,B); G4double chiRin = Chi_reggeon(2.,B);
|
|
//chiPin is data member of the class
|
|
|
|
G4double Exp_ChiR = G4Exp(-chiR);
|
|
|
|
G4double AmplitudeP = (1.0/C_pomeron)*(1.0 - G4Exp(-chiP))*Exp_ChiR;
|
|
G4double AmplitudeR = (1.0 - Exp_ChiR);
|
|
|
|
G4double AmplitudeP2, Apr_Diff, Atr_Diff, ADiff;
|
|
|
|
// Aelastic = sqr(AmplitudeP + AmplitudeR);
|
|
AmplitudeP2 = sqr(AmplitudeP);
|
|
Apr_Diff = (Cpr_pomeron - 1.0) * AmplitudeP2;
|
|
Atr_Diff = (Ctr_pomeron - 1.0) * AmplitudeP2;
|
|
ADiff = (Cpr_pomeron - 1.0) * (Ctr_pomeron - 1.0) * AmplitudeP2;
|
|
|
|
// ----------------------------------
|
|
Exp_ChiR = G4Exp(-chiRin);
|
|
AmplitudeP = (1.0/C_pomeron)*(1.0 - G4Exp(-chiPin))*Exp_ChiR;
|
|
AmplitudeR = (1.0 - Exp_ChiR);
|
|
|
|
G4double And, AndP, AndR;
|
|
|
|
And = (AmplitudeP + AmplitudeR);
|
|
AndP = (AmplitudeP + 0. );
|
|
AndR = (0. + AmplitudeR);
|
|
|
|
// ----------------------------------
|
|
if ( Mode == ALL)
|
|
{
|
|
Pint = Apr_Diff + Atr_Diff + ADiff + And;
|
|
Pprd = Apr_Diff/Pint; // Probability of projectile diffraction
|
|
Ptrd = Atr_Diff/Pint; // Probability of target diffraction
|
|
Pdd = ADiff /Pint; // Probability of double diffraction
|
|
Pnd = AndP /Pint; // Probability of non-diffractive inelastic interaction
|
|
Pnvr = AndR /Pint; // Probability of non-vacuum reggeon (nvr) inelastic interaction
|
|
}
|
|
else if ( Mode == WITHOUT_R)
|
|
{
|
|
Pint = Apr_Diff + Atr_Diff + ADiff + AndP;
|
|
Pprd = Apr_Diff/Pint;
|
|
Ptrd = Atr_Diff/Pint;
|
|
Pdd = ADiff /Pint;
|
|
Pnd = AndP /Pint;
|
|
Pnvr = 0.;
|
|
}
|
|
else
|
|
{ // Mode == NON_DIFF (of projectile)
|
|
Pint = Atr_Diff + AndP;
|
|
Pprd = 0.;
|
|
Ptrd = Atr_Diff/Pint;
|
|
Pdd = 0.;
|
|
Pnd = AndP /Pint;
|
|
Pnvr = 0.;
|
|
}
|
|
return;
|
|
}
|
|
|
|
|
|
G4int G4Reggeons::ncPomerons() // Non-complete Poisson distribution
|
|
{
|
|
if ( chiPin < 0.001 ) return 0; // At small average multiplicity of cutted pomerons
|
|
// it is better to return 0 to avoid problems with
|
|
// calculation exactness.
|
|
G4double ksi = G4UniformRand() * (1.0-G4Exp(-chiPin)) * G4Exp(chiPin);
|
|
G4double Term = chiPin;
|
|
G4double Sum = Term;
|
|
G4int nCuts = 1;
|
|
|
|
while ( Sum < ksi) {
|
|
nCuts++;
|
|
Term *= chiPin/(G4double) nCuts;
|
|
Sum += Term;
|
|
}
|
|
|
|
return nCuts;
|
|
}
|
|
|