322 lines
9.0 KiB
C++
322 lines
9.0 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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// $Id: G4eeCrossSections.cc,v 1.6 2006/06/29 19:32:42 gunter Exp $
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// GEANT4 tag $Name: geant4-08-02 $
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//
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// -------------------------------------------------------------------
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//
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// GEANT4 Class header file
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//
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//
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// File name: G4eeCrossSections
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//
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// Author: Vladimir Ivanchenko
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//
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// Creation date: 25.10.2003
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//
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// Modifications:
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//
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//
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// -------------------------------------------------------------------
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//
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#include "G4eeCrossSections.hh"
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#include "G4PionPlus.hh"
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#include "G4PionMinus.hh"
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#include "G4PionZero.hh"
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#include "G4KaonPlus.hh"
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#include "G4KaonMinus.hh"
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#include "G4KaonZeroLong.hh"
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#include "G4PhysicsLinearVector.hh"
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#include <iostream>
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#include <fstream>
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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using namespace std;
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G4eeCrossSections::G4eeCrossSections()
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{
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Initialise();
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4eeCrossSections::~G4eeCrossSections()
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{}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4eeCrossSections::Initialise()
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{
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MsPi = G4PionPlus::PionPlus()->GetPDGMass();
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MsPi0= G4PionZero::PionZero()->GetPDGMass();
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MsEta= 547.30*MeV;
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MsEtap=957.78*MeV;
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MsKs = G4KaonZeroLong::KaonZeroLong()->GetPDGMass();
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MsKc=G4KaonPlus::KaonPlus()->GetPDGMass();
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MsRho= 770.0*MeV;
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MsOm = 781.94*MeV;
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MsF0 = 980.0*MeV;
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MsA0 = 983.4*MeV;
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MsPhi= 1019.413*MeV;
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MsK892 = 891.66*MeV;
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MsK0892 = 896.10*MeV;
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GRho = 150.7*MeV;
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GOm = 8.41*MeV;
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GPhi = 4.43*MeV;
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GK892 = 50.8*MeV;
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GK0892 = 50.5*MeV;
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PhRho = 0.0;
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PhOm = 0.0;
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PhPhi = 155.0*degree;
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PhRhoPi = 186.0*degree;
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BrRhoPiG = 4.5e-4;
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BrRhoPi0G= 6.8e-4;
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BrRhoEtaG= 2.4e-4;
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BrRhoEe = 4.49e-5;
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BrOm3Pi = 0.888;
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BrOmPi0G= 0.085;
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BrOmEtaG= 6.5e-4;
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BrOm2Pi = 0.0221;
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PhOm2Pi = 90.0;
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BrOmEe = 7.07e-5;
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BrPhi2Kc = 0.491;
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BrPhiKsKl= 0.341;
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BrPhi3Pi = 0.155;
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BrPhiPi0G= 1.31e-3;
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BrPhiEtaG= 1.26e-2;
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BrPhi2Pi = 8.e-5;
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PhPhi2Pi = -20.0*degree;
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BrPhiEe = 2.99e-4;
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MsRho3 = MsRho*MsRho*MsRho;
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MsOm3 = MsOm*MsOm*MsOm;
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MsPhi3 = MsPhi*MsPhi*MsPhi;
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MeVnb = 3.8938e+11*nanobarn;
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Alpha = 1.0/137.036;
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AOmRho = 3.0;
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ARhoPRho = 0.72;
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cterm=0.;
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mssig = 600.*MeV;
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gsig = 500.*MeV;
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brsigpipi = 1.;
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msrho1450 = 1465.*MeV;
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msrho1700 = 1700.*MeV;
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grho1450 = 310.*MeV;
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grho1700 = 240.*MeV;
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arhoompi0 = 1.;
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arho1450ompi0 = 1.;
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arho1700ompi0 = 1.;
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phrhoompi0 = 0.;
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phrho1450ompi0 = pi;
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phrho1700ompi0 = 0.;
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aomrhopi0 = 1.;
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phomrhopi0 = 0.;
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arhopi0pi0g = 0.;
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aompi0pi0g = 0.;
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phrhopi0pi0g = 0.;
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phompi0pi0g = 0.;
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brrho1450ompi0 = 0.02;
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brrho1450pipi = 0.50;
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brrho1700ompi0 = 1.0;
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brrho1700pipi = 0.02;
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aphirhopi0 = 1.;
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phphirhopi0 = pi;
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arhosigg = 0.;
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phrhosigg = 0.;
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aomsigg = 0.;
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phomsigg = 0.;
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G4String w0, w1, w2;
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ph3p = 0;
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/*
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G4double emin, emax;
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G4int nbins;
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const G4String fname = "wrhopi.wid";
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ifstream fi(fname.c_str());
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fi >> w0 >> nbins >> w1 >> emin >> w2 >> emax;
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emin *= MeV;
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emax *= MeV;
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ph3p = new G4PhysicsLinearVector(emin,emax,nbins);
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G4int nlines = nbins/5;
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G4double s0, s1, s2, s3, s4;
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for(G4int i=0; i<nlines; i++) {
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fi >> s0 >> s1 >> s2 >> s3 >> s4;
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ph3p->PutValue(5*i, s0);
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ph3p->PutValue(5*i + 1, s1);
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ph3p->PutValue(5*i + 2, s2);
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ph3p->PutValue(5*i + 3, s3);
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ph3p->PutValue(5*i + 4, s4);
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}
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fi.close();
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*/
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4eeCrossSections::CrossSection2pi(G4double e)
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{
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complex<G4double> xr(cos(PhRho),sin(PhRho));
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complex<G4double> xo(cos(PhOm2Pi),sin(PhOm2Pi));
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complex<G4double> xf(cos(PhPhi2Pi),sin(PhPhi2Pi));
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G4double s = e*e;
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complex<G4double> drho = DpRho(e);
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complex<G4double> dom = DpOm(e);
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complex<G4double> dphi = DpPhi(e);
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complex<G4double> amp =
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sqrt(Width2p(s,MsRho,GRho,1.0,MsPi)*MsRho3*BrRhoEe*GRho)*xr/drho
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+ sqrt(Width2p(s,MsOm,GOm,BrOm2Pi,MsPi)*MsOm3*BrOmEe*GOm)*xo/dom
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+ sqrt(Width2p(s,MsPhi,GPhi,BrPhi2Pi,MsPi)*MsPhi3*BrPhiEe*GPhi)*xf/dphi;
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G4double cross = 12.0*pi*MeVnb*norm(amp)/(e*s);
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return cross;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4eeCrossSections::Width2p(G4double s, G4double mres,
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G4double g, G4double br, G4double m)
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{
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G4double m2 = 4.0*m*m;
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G4double s0 = mres*mres;
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G4double f = (s - m2)/(s0 - m2);
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if(f < 0.0) f = 0.0;
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return g*br*sqrt(f)*f*s0/s;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4eeCrossSections::Width3p(G4double s, G4double mres,
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G4double g, G4double br)
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{
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G4double w = PhaseSpace3p(sqrt(s));
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G4double w0= PhaseSpace3p(mres);
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G4double x = g*br*w/w0;
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return x;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4eeCrossSections::PhaseSpace3p(G4double e)
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{
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// G4bool b;
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// G4double x = ph3p->GetValue(e, b);
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G4double x = 1.0;
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G4double emev = e/MeV;
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G4double y = 414.12/emev;
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x *= pow(e/MsOm, 5.0) * pow(emev*0.1, 3.0)*(1.0 - y*y);
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return x;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4eeCrossSections::WidthPg(G4double s, G4double mres,
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G4double g, G4double br, G4double m)
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{
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G4double m2 = m*m;
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G4double s0 = mres*mres;
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G4double f = (s - m2)*mres/((s0 - m2)*sqrt(s));
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if(f < 0.0) f = 0.0;
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return g*br*f*f*f;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4eeCrossSections::WidthRho(G4double e)
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{
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G4double w = Width2p(e*e, MsRho, GRho, 1.0, MsPi);
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return w;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4eeCrossSections::WidthOm(G4double e)
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{
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G4double s = e*e;
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G4double w = (Width3p(s, MsOm, GOm, BrOm3Pi) +
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WidthPg(s, MsOm, GOm, BrOmPi0G, MsPi0) +
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WidthPg(s, MsOm, GOm, BrOmEtaG, MsEta) +
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Width2p(s, MsOm, GOm, BrOm2Pi, MsPi)) /
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(BrOm3Pi+BrOmPi0G+BrOmEtaG+BrOm2Pi);
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return w;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4eeCrossSections::WidthPhi(G4double e)
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{
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G4double s = e*e;
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G4double w = (Width3p(s, MsPhi, GPhi, BrPhi3Pi) +
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WidthPg(s, MsPhi, GPhi, BrPhiPi0G, MsPi0) +
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WidthPg(s, MsPhi, GPhi, BrPhiEtaG, MsEta) +
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Width2p(s, MsPhi, GPhi, BrPhi2Kc, MsKc) +
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Width2p(s, MsPhi, GPhi, BrPhiKsKl, MsKs)) /
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(BrPhi3Pi+BrPhiPi0G+BrPhiEtaG+BrPhi2Kc+BrPhiKsKl);
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return w;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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complex<G4double> G4eeCrossSections::DpRho(G4double e)
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{
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complex<G4double> d(MsRho*MsRho - e*e, -e*WidthRho(e));
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return d;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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complex<G4double> G4eeCrossSections::DpOm(G4double e)
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{
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complex<G4double> d(MsOm*MsOm - e*e, -e*WidthOm(e));
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return d;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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complex<G4double> G4eeCrossSections::DpPhi(G4double e)
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{
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complex<G4double> d(MsPhi*MsPhi - e*e, -e*WidthPhi(e));
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return d;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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