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This commit is contained in:
Gabriele Cosmo
2018-06-29 10:58:11 +02:00
parent fe81a77428
commit 6aa23be517
1581 changed files with 124288 additions and 83758 deletions
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source/processes/hadronic/models/parton_string/qgsm/src/G4Reggeons.cc
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//
// ********************************************************************
// * License and Disclaimer *
// * *
// * The Geant4 software is copyright of the Copyright Holders of *
// * the Geant4 Collaboration. It is provided under the terms and *
// * conditions of the Geant4 Software License, included in the file *
// * LICENSE and available at http://cern.ch/geant4/license . These *
// * include a list of copyright holders. *
// * *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work make any representation or warranty, express or implied, *
// * regarding this software system or assume any liability for its *
// * use. Please see the license in the file LICENSE and URL above *
// * for the full disclaimer and the limitation of liability. *
// * *
// * This code implementation is the result of the scientific and *
// * technical work of the GEANT4 collaboration. *
// * By using, copying, modifying or distributing the software (or *
// * any work based on the software) you agree to acknowledge its *
// * use in resulting scientific publications, and indicate your *
// * acceptance of all terms of the Geant4 Software license. *
// ********************************************************************
//
//
// $Id: G4Reggeons.cc 99348 2016-09-19 08:39:04Z vuzhinsk $
//
#include "G4Reggeons.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4Pow.hh"
#include "G4Exp.hh"
#include "G4Log.hh"
G4Reggeons::G4Reggeons(const G4ParticleDefinition * particle)
{
// KP Orig
Alpha_pomeron = 1.12; //0.9808;
Alphaprime_pomeron = 0.22/GeV/GeV; //0.25/GeV/GeV;
S0_pomeron = 1.0*GeV*GeV; //2.7*GeV*GeV;
Alpha_pomeronHard = 1.47;
Gamma_pomeronHard = 0.0/GeV/GeV;
G4int PDGcode = particle->GetPDGEncoding();
G4int absPDGcode = std::abs(PDGcode);
//-------------------------------------------------------
// KP Orig
G4double C_pomeron_NN = 1.5;
G4double C_pomeron_N = std::sqrt(C_pomeron_NN);
G4double Gamma_pomeron_NN = 2.14/GeV/GeV; //(2.6+3.96)
G4double Gamma_pomeron_N = std::sqrt(Gamma_pomeron_NN);
G4double Gamma_pomeron_Pr(0.), Gamma_pomeron_Tr(0.);
G4double Rsquare_pomeron_NN = 3.30/GeV/GeV; //3.56
G4double Rsquare_pomeron_N = Rsquare_pomeron_NN/2.;
G4double Rsquare_pomeron_Pr(0.), Rsquare_pomeron_Tr(0.);
//-------------------------------------------------------
if( absPDGcode > 1000 ) { // Projectile is baryon or anti_baryon --------
Cpr_pomeron = C_pomeron_N; // Shower enhancement coefficient for projectile
Ctr_pomeron = C_pomeron_N; // Shower enhancement coefficient for target
C_pomeron = Cpr_pomeron*Ctr_pomeron;
Gamma_pomeron_Pr = Gamma_pomeron_N; // vertex constant for projectile
Gamma_pomeron_Tr = Gamma_pomeron_N; // vertex constant for target
Gamma_pomeron = Gamma_pomeron_Pr * Gamma_pomeron_Tr;
Rsquare_pomeron_Pr = Rsquare_pomeron_N; // R^2 of pomeron-projectile interaction
Rsquare_pomeron_Tr = Rsquare_pomeron_N; // R^2 of pomeron-target interaction
Rsquare_pomeron = Rsquare_pomeron_Pr + Rsquare_pomeron_Tr;
Freggeon_Alpha = 0.7; // Intersept of f-trajectory
Freggeon_Alphaprime = 0.8/GeV/GeV; // Slope of f-trajectory
Freggeon_Gamma = sqr(2.871)/GeV/GeV; // Vertex constant of f-meson - nucleon interactions
Freggeon_Rsquare = 2*0.916/GeV/GeV; // R^2 of f-meson - nucleon interactions
Freggeon_C = 1.0; // Shower enhancement coefficient
FParity = +1; // Parity of the trajectory
Wreggeon_Alpha = 0.4; // Intersept of omega-trajectory (w)
Wreggeon_Alphaprime = 0.9/GeV/GeV; // Slope of w-trajectory
Wreggeon_Gamma = sqr(2.241)/GeV/GeV; // Vertex constant of w-meson - nucleon interactions
Wreggeon_Rsquare = 2*0.945/GeV/GeV *0.5; // R^2 of w-meson - nucleon interactions
Wreggeon_C = 1.0; // Shower enhancement coefficient
if(PDGcode > 0) WParity = -1; // Parity +1 for Pbar P, and -1 for PP interactions
if(PDGcode < 0) WParity = +1;
}
else if ( absPDGcode == 211 || PDGcode == 111 ) { // Projectile is Pion
Cpr_pomeron = 1.352;
Ctr_pomeron = C_pomeron_N;
C_pomeron = Cpr_pomeron*Ctr_pomeron;
// KP
Gamma_pomeron_Pr = 0.89/GeV; // 0.85 -> 0.89 // Uzhi
Gamma_pomeron_Tr = Gamma_pomeron_N;
Gamma_pomeron = Gamma_pomeron_Pr * Gamma_pomeron_Tr;
Rsquare_pomeron_Pr = 0.5/GeV/GeV;
Rsquare_pomeron_Tr = Rsquare_pomeron_N;
Rsquare_pomeron = Rsquare_pomeron_Pr + Rsquare_pomeron_Tr;
Freggeon_Alpha = 0.7;
Freggeon_Gamma = 3.524/GeV/GeV;
Freggeon_Rsquare = 1.0/GeV/GeV;
Freggeon_Alphaprime = 0.8/GeV/GeV;
Freggeon_C = 1.0;
FParity = +1;
Wreggeon_Alpha = 0.5;
Wreggeon_Gamma = 0.56/GeV/GeV; // 1.12 -> 0.56 Uzhi
Wreggeon_Rsquare = 9.19/GeV/GeV;
Wreggeon_Alphaprime = 0.9/GeV/GeV;
Wreggeon_C = 1.0;
if(PDGcode > 0) WParity = -1;
if(PDGcode < 0) WParity = +1;
}
else if ( absPDGcode == 321 || absPDGcode == 311 ||
PDGcode == 130 || PDGcode == 310 ) { // Projectile is Kaon
Cpr_pomeron = 1.522;
Ctr_pomeron = C_pomeron_N;
C_pomeron = Cpr_pomeron*Ctr_pomeron;
Gamma_pomeron_Pr = 1.312/GeV;
Gamma_pomeron_Tr = Gamma_pomeron_N;
Gamma_pomeron = Gamma_pomeron_Pr * Gamma_pomeron_Tr;
Rsquare_pomeron_Pr = 0.31/GeV/GeV;
Rsquare_pomeron_Tr = Rsquare_pomeron_N;
Rsquare_pomeron = Rsquare_pomeron_Pr + Rsquare_pomeron_Tr;
Freggeon_Alpha = 0.0;
Freggeon_Gamma = 0.0/GeV/GeV;
Freggeon_Rsquare = 1.0/GeV/GeV;
Freggeon_Alphaprime = 0.0/GeV/GeV;
Freggeon_C = 1.0;
FParity = +1;
Wreggeon_Alpha = 0.0;
Wreggeon_Gamma = 0.0/GeV/GeV;
Wreggeon_Rsquare = 1.0/GeV/GeV;
Wreggeon_Alphaprime = 0.0/GeV/GeV;
Wreggeon_C = 1.0;
WParity = -1;
}
else if ( absPDGcode == 22 ) { // Projectile is Gamma
Cpr_pomeron = 1.437;
Ctr_pomeron = C_pomeron_N;
C_pomeron = Cpr_pomeron*Ctr_pomeron;
Gamma_pomeron_Pr = 1.415/GeV/GeV;
Gamma_pomeron_Tr = Gamma_pomeron_N;
Gamma_pomeron = Gamma_pomeron_Pr * Gamma_pomeron_Tr;
Rsquare_pomeron_Pr = 0.51/GeV/GeV;
Rsquare_pomeron_Tr = Rsquare_pomeron_N;
Rsquare_pomeron = Rsquare_pomeron_Pr + Rsquare_pomeron_Tr;
Freggeon_Alpha = 0.0;
Freggeon_Gamma = 0.0/GeV/GeV;
Freggeon_Rsquare = 1.0/GeV/GeV;
Freggeon_Alphaprime = 0.0/GeV/GeV;
Freggeon_C = 1.0;
FParity = +1;
Wreggeon_Alpha = 0.0;
Wreggeon_Gamma = 0.0/GeV/GeV;
Wreggeon_Rsquare = 1.0/GeV/GeV;
Wreggeon_Alphaprime = 0.0/GeV/GeV;
Wreggeon_C = 1.0;
WParity = -1;
}
else { // Projectile is undefined, Nucleon assumed
Cpr_pomeron = C_pomeron_N;
Ctr_pomeron = C_pomeron_N;
C_pomeron = Cpr_pomeron*Ctr_pomeron;
Gamma_pomeron_Pr = Gamma_pomeron_N;
Gamma_pomeron_Tr = Gamma_pomeron_N;
Gamma_pomeron = Gamma_pomeron_Pr * Gamma_pomeron_Tr;
Rsquare_pomeron_Pr = Rsquare_pomeron_N;
Rsquare_pomeron_Tr = Rsquare_pomeron_N;
Rsquare_pomeron = Rsquare_pomeron_Pr + Rsquare_pomeron_Tr;
Freggeon_Alpha = 0.723;
Freggeon_Gamma = 8.801/GeV/GeV;
Freggeon_Rsquare = 0.396/GeV/GeV;
Freggeon_Alphaprime = 1.324/GeV/GeV;
Freggeon_C = 1.0;
FParity = +1;
Wreggeon_Alpha = 0.353;
Wreggeon_Gamma = 8.516/GeV/GeV;
Wreggeon_Rsquare = 24.40/GeV/GeV;
Wreggeon_Alphaprime = 1.5/GeV/GeV;
Wreggeon_C = 1.0;
WParity = -1;
}
/*
G4cout<<G4endl<<"Reggeon's parameters for Particle "<<particle->GetParticleName()<<" "<<PDGcode<<G4endl<<G4endl;
G4cout<<"Alpha_pomeron "<<Alpha_pomeron;
G4cout<<" Alphaprime_pomeron "<<Alphaprime_pomeron*GeV*GeV;
G4cout<<" S0_pomeron "<<S0_pomeron/GeV/GeV<<G4endl;
G4cout<<"Gamma_pomeron "<<Gamma_pomeron*GeV*GeV;
G4cout<<" Rsquare_pomeron "<<Rsquare_pomeron*GeV*GeV;
G4cout<<" C_pomeron "<<C_pomeron<<G4endl<<G4endl;
*/
}
G4double G4Reggeons::Get_Cprojectile() {return Cpr_pomeron;}
G4double G4Reggeons::Get_Ctarget() {return Ctr_pomeron;}
G4Reggeons::~G4Reggeons() {}
void G4Reggeons::SetS(G4double S) {Sint = S;}
void G4Reggeons::CalculateXs()
{
Xtotal =0.; XtotalP=0.; XtotalR=0.;
Xelastic=0.; Xpr_Diff=0.; Xtr_Diff=0.; XDDiff=0.; G4double XDiff=0.;
Xinel =0.; Xnd=0.; XndP=0.; XndR=0.;
G4double AmplitudeP(0.), AmplitudeR(0.);
G4double B_max = 10.*fermi;
G4double dB = B_max/10000.;
G4double B =-dB/2.;
G4double chiP(0.), chiR(0.), chiRin(0.); // chiPin Pomeron inelastic phase is a data member
chiPin=0.;
for(G4int i=0; i<10000;i++)
{
B += dB;
chiP = Chi_pomeron(1.,B); chiR = Chi_reggeon(1.,B);
chiPin = Chi_pomeron(2.,B); chiRin = Chi_reggeon(2.,B);
AmplitudeP = (1.0/C_pomeron)*(1.0 - G4Exp(-chiP))*G4Exp(-chiR);
AmplitudeR = (1.0 - G4Exp(-chiR));
Xtotal += 2 * (AmplitudeP + AmplitudeR) * B * dB;
XtotalP += 2 * (AmplitudeP + 0. ) * B * dB;
XtotalR += 2 * (0. + AmplitudeR) * B * dB;
Xelastic += sqr(AmplitudeP + AmplitudeR) * B * dB;
Xpr_Diff += (Cpr_pomeron - 1.0) * sqr(AmplitudeP) * B * dB;
Xtr_Diff += (Ctr_pomeron - 1.0) * sqr(AmplitudeP) * B * dB;
XDiff += (Cpr_pomeron - 1.0) * (Ctr_pomeron - 1.0) * sqr(AmplitudeP) * B * dB;
// ----------------------------------
AmplitudeP = (1.0/C_pomeron)*(1.0 - G4Exp(-chiPin))*G4Exp(-chiRin);
AmplitudeR = (1.0 - G4Exp(-chiRin));
Xnd += (AmplitudeP + AmplitudeR) * B * dB;
XndP += (AmplitudeP + 0. ) * B * dB;
XndR += (0. + AmplitudeR) * B * dB;
}
Xtotal *=twopi; XtotalP *=twopi; XtotalR *=twopi;
Xelastic *=twopi; Xpr_Diff *=twopi; Xtr_Diff *=twopi; XDiff *=twopi;
Xinel = Xtotal - Xelastic;
(void)Xinel; // To avoid compiler warning "variable not used"
Xnd *=twopi; XndP *=twopi; XndR *=twopi;
XDDiff = XDiff-Xpr_Diff-Xtr_Diff;
/*
G4cout<<"Total totalP totalR "<<Xtotal/millibarn <<" "<<XtotalP/millibarn <<" "<<XtotalR/millibarn<<" mb"<<G4endl;
G4cout<<"Elastic "<<Xelastic/millibarn <<G4endl;
G4cout<<"PrDiff TrDiff W_Diff "<<Xpr_Diff/millibarn<<" "<<Xtr_Diff/millibarn<<" "<<XDiff/millibarn<<G4endl;
G4cout<<"Inelastic "<<Xinel/millibarn <<G4endl;
G4cout<<"NonDiff Pom & Reg "<<Xnd/millibarn <<" "<<XndP/millibarn <<" "<<XndR/millibarn <<G4endl;
*/
}
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-complite 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;
}