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Kamil Sedlak 2009-05-18

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This is the first version of the muSR simulation code (musrSim)
based on the merged codes of Kamil Sedlak and Toni Shiroka.
It should be a running version of the simulation code, however 
it has not been very well tested, therefore it will probably
need some further development.
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sedlak
2009-05-18 09:59:52 +00:00
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// Geant4 simulation for MuSR
// AUTHOR: Toni SHIROKA, Paul Scherrer Institut, PSI
// DATE : 2008-05
//
//
// ********************************************************************
// * 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. *
// ********************************************************************
//
// ------------------------------------------------------------
// GEANT 4 class header file
//
// History:
// 17 August 2004 P.Gumplinger and T.MacPhail
// samples Michel spectrum including 1st order
// radiative corrections
// Reference: Florian Scheck "Muon Physics", in Physics Reports
// (Review Section of Physics Letters) 44, No. 4 (1978)
// 187-248. North-Holland Publishing Company, Amsterdam
// at page 210 cc.
//
// W.E. Fisher and F. Scheck, Nucl. Phys. B83 (1974) 25.
//
// ------------------------------------------------------------
#ifndef MuDecayChannelWithSpin_hh
#define MuDecayChannelWithSpin_hh 1
#include "globals.hh"
#include "G4ThreeVector.hh"
#include "MuDecayChannel.hh"
class MuDecayChannelWithSpin : public MuDecayChannel
{
// Class Decription
// This class describes muon decay kinemtics.
// This version assumes V-A coupling with 1st order radiative correctons,
// the standard model Michel parameter values, but
// gives incorrect energy spectrum for neutrinos
public: // With Description
//Constructors
MuDecayChannelWithSpin(const G4String& theParentName,
G4double theBR);
// Destructor
virtual ~MuDecayChannelWithSpin();
public: // With Description
virtual G4DecayProducts *DecayIt(G4double);
void SetPolarization(G4ThreeVector);
const G4ThreeVector& GetPolarization() const;
private:
G4ThreeVector parent_polarization;
// Radiative Correction Factors
G4double F_c(G4double x, G4double x0);
G4double F_theta(G4double x, G4double x0);
G4double R_c(G4double x);
G4double EMMU;
G4double EMASS;
};
inline void MuDecayChannelWithSpin::SetPolarization(G4ThreeVector polar)
{
parent_polarization = polar;
}
inline const G4ThreeVector& MuDecayChannelWithSpin::GetPolarization() const
{
return parent_polarization;
}
inline G4double MuDecayChannelWithSpin::F_c(G4double x, G4double x0)
{
G4double omega = std::log(EMMU/EMASS);
G4double f_c;
f_c = (5.+17.*x-34.*x*x)*(omega+std::log(x))-22.*x+34.*x*x;
f_c = (1.-x)/(3.*x*x)*f_c;
f_c = (6.-4.*x)*R_c(x)+(6.-6.*x)*std::log(x) + f_c;
f_c = (fine_structure_const/twopi) * (x*x-x0*x0) * f_c;
return f_c;
}
inline G4double MuDecayChannelWithSpin::F_theta(G4double x, G4double x0)
{
G4double omega = std::log(EMMU/EMASS);
G4double f_theta;
f_theta = (1.+x+34*x*x)*(omega+std::log(x))+3.-7.*x-32.*x*x;
f_theta = f_theta + ((4.*(1.-x)*(1.-x))/x)*std::log(1.-x);
f_theta = (1.-x)/(3.*x*x) * f_theta;
f_theta = (2.-4.*x)*R_c(x)+(2.-6.*x)*std::log(x)-f_theta;
f_theta = (fine_structure_const/twopi) * (x*x-x0*x0) * f_theta;
return f_theta;
}
#endif