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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/management/src/G4PomeronCrossSection.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: G4PomeronCrossSection.cc 100828 2016-11-02 15:25:59Z gcosmo $
//
#include "G4PomeronCrossSection.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4Pow.hh"
#include "G4Exp.hh"
#include "G4Log.hh"
G4PomeronCrossSection::G4PomeronCrossSection() :
pomeron_Alpha(0), pomeron_Alpha_Hard(0), pomeron_Alphaprime(0),
pomeron_C(0), pomeron_Gamma(0), pomeron_Gamma_Hard(0),
pomeron_Rsquare(0), pomeron_S(0)
{}
G4PomeronCrossSection::~G4PomeronCrossSection()
{;}
//**********************************************************************************************
G4PomeronCrossSection::G4PomeronCrossSection(const G4ParticleDefinition * particle)
{
G4int Encoding = std::abs(particle->GetPDGEncoding());
if (std::abs(particle->GetBaryonNumber())!=0)
InitForNucleon();
else if (Encoding/100== 3 || Encoding/10 == 3)
InitForKaon();
else
InitForPion();
}
//**********************************************************************************************
G4PomeronCrossSection::G4PomeronCrossSection(const G4Proton * )
{
InitForNucleon();
}
G4PomeronCrossSection::G4PomeronCrossSection(const G4Neutron * )
{
InitForNucleon();
}
G4PomeronCrossSection::G4PomeronCrossSection(const G4PionPlus * )
{
InitForPion();
}
G4PomeronCrossSection::G4PomeronCrossSection(const G4PionMinus * )
{
InitForPion();
}
G4PomeronCrossSection::G4PomeronCrossSection(const G4PionZero * )
{
InitForPion();
}
G4PomeronCrossSection::G4PomeronCrossSection(const G4KaonPlus * )
{
InitForKaon();
}
G4PomeronCrossSection::G4PomeronCrossSection(const G4KaonMinus * )
{
InitForKaon();
}
G4PomeronCrossSection::G4PomeronCrossSection(const G4KaonZero * )
{
InitForKaon();
}
G4PomeronCrossSection::G4PomeronCrossSection(const G4KaonZeroLong * )
{
InitForKaon();
}
G4PomeronCrossSection::G4PomeronCrossSection(const G4KaonZeroShort * )
{
InitForKaon();
}
G4PomeronCrossSection::G4PomeronCrossSection(const G4Gamma * )
{
InitForGamma();
}
G4double G4PomeronCrossSection::GetTotalCrossSection(const G4double S)
{
G4double FZ2= Expand(Z(S)/2);
return SigP(S) * FZ2;
}
G4double G4PomeronCrossSection::GetElasticCrossSection(const G4double S)
{
return SigP(S)/pomeron_C *(Expand(Z(S)/2) - Expand(Z(S)));
}
G4double G4PomeronCrossSection::GetDiffractiveCrossSection(const G4double S)
{
return ( pomeron_C -1) * GetElasticCrossSection(S);
}
G4double G4PomeronCrossSection::GetInelasticCrossSection(const G4double S)
{
return GetTotalCrossSection(S) - GetElasticCrossSection(S);
}
//-------------------------Probabilities ----------------------------
G4double G4PomeronCrossSection::GetTotalProbability(const G4double S,
const G4double impactsquare)
{
return 2/pomeron_C*(1-G4Exp(-1*Eikonal(S,impactsquare)));
}
G4double G4PomeronCrossSection::GetDiffractiveProbability(const G4double S,
const G4double impactsquare)
{
return (pomeron_C-1)/pomeron_C *
(GetTotalProbability(S,impactsquare) - GetNondiffractiveProbability(S,impactsquare));
}
G4double G4PomeronCrossSection::GetNondiffractiveProbability(const G4double S,
const G4double impactsquare)
{
return (1-G4Exp(-2*Eikonal(S,impactsquare)))/pomeron_C;
}
G4double G4PomeronCrossSection::GetElasticProbability(const G4double S,
const G4double impactsquare)
{
return (GetTotalProbability(S,impactsquare) - GetInelasticProbability(S,impactsquare));
}
G4double G4PomeronCrossSection::GetInelasticProbability(const G4double S,
const G4double impactsquare)
{
return GetNondiffractiveProbability(S,impactsquare) + GetDiffractiveProbability(S,impactsquare);
}
G4double G4PomeronCrossSection::GetCutPomeronProbability(const G4double S,
const G4double impactsquare, const G4int nPomerons)
{
G4double factorial=G4Pow::GetInstance()->factorial(nPomerons);
return G4Exp(-2*Eikonal(S,impactsquare))/pomeron_C*
G4Pow::GetInstance()->powN(2*Eikonal(S,impactsquare),nPomerons)/factorial;
}
// ---------------Temporary --- GF
void G4PomeronCrossSection::Setgamma(const G4double agam)
{
pomeron_Gamma=agam/GeV/GeV;
}
//----------------- private/Implementation methods
void G4PomeronCrossSection::InitForNucleon()
{
//pomeron_S= 3.0*GeV*GeV;
pomeron_S= 2.7*GeV*GeV;
//pomeron_Gamma= 2.16/GeV/GeV;
//pomeron_Gamma= 3.96/GeV/GeV;
pomeron_Gamma= (2.6+3.96)/GeV/GeV;
pomeron_C= 1.4;
pomeron_Rsquare= 3.56/GeV/GeV;
//pomeron_Alpha= 1.0808;
pomeron_Alpha= 0.9808;
pomeron_Alphaprime= 0.25/GeV/GeV;
pomeron_Gamma_Hard= 0.0002/GeV/GeV; // Note! if pomeron_Gamma_Hard != 0 to fit total pp-crosscection
// pomeron_Gamma_Soft shold be 2.35/GeV/GeV
pomeron_Alpha_Hard= 1.47;
}
void G4PomeronCrossSection::InitForPion()
{
pomeron_S= 1.5*GeV*GeV;
//pomeron_Gamma= 1.46/GeV/GeV;
pomeron_Gamma= 2.17/GeV/GeV;
pomeron_C= 1.6;
pomeron_Rsquare= 2.36/GeV/GeV;
pomeron_Alpha= 1.0808;
pomeron_Alphaprime= 0.25/GeV/GeV;
pomeron_Gamma_Hard= 0.0002/GeV/GeV;
pomeron_Alpha_Hard= 1.47;
}
void G4PomeronCrossSection::InitForKaon()
{
pomeron_S= 2.3*GeV*GeV;
//pomeron_Gamma= 1.31/GeV/GeV;
pomeron_Gamma= 1.92/GeV/GeV;
pomeron_C= 1.8;
pomeron_Rsquare= 1.96/GeV/GeV;
pomeron_Alpha= 1.0808;
pomeron_Alphaprime= 0.25/GeV/GeV;
pomeron_Gamma_Hard= 0.0002/GeV/GeV;
pomeron_Alpha_Hard= 1.47;
}
void G4PomeronCrossSection::InitForGamma()
{
pomeron_S= 1.7*GeV*GeV;
//pomeron_Gamma= 1.42/GeV/GeV;
pomeron_Gamma= 2.07/GeV/GeV;
pomeron_C= 1.7;
pomeron_Rsquare= 2.16/GeV/GeV;
pomeron_Alpha= 1.0808;
pomeron_Alphaprime= 0.25/GeV/GeV;
pomeron_Gamma_Hard= 0.0002/GeV/GeV;
pomeron_Alpha_Hard= 1.47;
}
G4double G4PomeronCrossSection::Expand(G4double z)
{
G4double sum=1.;
G4double current=1.;
for (G4int j=2; j<21; j++ ) {
current *= -z *(j-1)/sqr(j);
sum+=current;
}
return sum;
}
G4double G4PomeronCrossSection::Power(const G4double S)
{
return pomeron_Gamma * G4Pow::GetInstance()->powA(S/pomeron_S, pomeron_Alpha -1);
}
G4double G4PomeronCrossSection::Z(const G4double S)
{
return 2*pomeron_C * Power(S) / Lambda(S);
}
G4double G4PomeronCrossSection::Lambda(const G4double S)
{
return pomeron_Rsquare+pomeron_Alphaprime*G4Log(S/pomeron_S);
}
G4double G4PomeronCrossSection::SigP(const G4double S)
{
return 8 * pi * hbarc_squared * Power(S);
}
G4double G4PomeronCrossSection::Eikonal(const G4double S, const G4double impactsquare)
{
return Z(S)/2 * G4Exp(-impactsquare/(4*Lambda(S)*hbarc_squared));
}
//*************************************************************************************************
G4double G4PomeronCrossSection::PowerSoft(const G4double S)
{
return pomeron_Gamma * G4Pow::GetInstance()->powA(S/pomeron_S, pomeron_Alpha -1);
}
G4double G4PomeronCrossSection::PowerHard(const G4double S)
{
return pomeron_Gamma_Hard*G4Pow::GetInstance()->powA(S/pomeron_S, pomeron_Alpha_Hard -1);
}
G4double G4PomeronCrossSection::LambdaSoft(const G4double S)
{
return pomeron_Rsquare+pomeron_Alphaprime*G4Log(S/pomeron_S);
}
G4double G4PomeronCrossSection::LambdaHard(const G4double /*S*/)
{
return pomeron_Rsquare; //+pomeron_Alphaprime*G4Log(s/pomeron_S);
}
G4double G4PomeronCrossSection::Zsoft(const G4double S)
{
return 2*pomeron_C*PowerHard(S) / LambdaSoft(S);
}
G4double G4PomeronCrossSection::Zhard(const G4double S)
{
return 2*pomeron_C*PowerHard(S)/LambdaHard(S);
}
G4double G4PomeronCrossSection::SoftEikonal(G4double S, G4double impactsquare)
{
return Zsoft(S)/2*G4Exp(-impactsquare/LambdaSoft(S)/hbarc_squared/4);
}
G4double G4PomeronCrossSection::HardEikonal(G4double S, G4double impactsquare)
{
return Zhard(S)/2*G4Exp(-impactsquare/LambdaHard(S)/hbarc_squared/4);
}
//*************************************************************************************************