Kamil Sedlak
1e050e6976
- a copyright information added to all relevant *.cc and *.hh files - the file "COPYING" added to the main directory of the musrSim
125 lines
4.4 KiB
C++
125 lines
4.4 KiB
C++
// ********************************************************************
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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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// GEANT 4 class header file
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//
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// History:
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// 17 August 2004 P.Gumplinger and T.MacPhail
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// samples Michel spectrum including 1st order
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// radiative corrections
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// Reference: Florian Scheck "Muon Physics", in Physics Reports
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// (Review Section of Physics Letters) 44, No. 4 (1978)
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// 187-248. North-Holland Publishing Company, Amsterdam
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// at page 210 cc.
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//
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// W.E. Fisher and F. Scheck, Nucl. Phys. B83 (1974) 25.
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//
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// ------------------------------------------------------------
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#ifndef MuDecayChannelWithSpin_hh
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#define MuDecayChannelWithSpin_hh 1
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#include "globals.hh"
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#include "G4ThreeVector.hh"
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#include "MuDecayChannel.hh"
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class MuDecayChannelWithSpin : public MuDecayChannel
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{
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// Class Decription
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// This class describes muon decay kinemtics.
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// This version assumes V-A coupling with 1st order radiative correctons,
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// the standard model Michel parameter values, but
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// gives incorrect energy spectrum for neutrinos
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public: // With Description
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//Constructors
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MuDecayChannelWithSpin(const G4String& theParentName,
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G4double theBR);
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// Destructor
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virtual ~MuDecayChannelWithSpin();
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public: // With Description
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virtual G4DecayProducts *DecayIt(G4double);
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void SetPolarization(G4ThreeVector);
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const G4ThreeVector& GetPolarization() const;
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private:
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G4ThreeVector parent_polarization;
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// Radiative Correction Factors
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G4double F_c(G4double x, G4double x0);
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G4double F_theta(G4double x, G4double x0);
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G4double R_c(G4double x);
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G4double EMMU;
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G4double EMASS;
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};
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inline void MuDecayChannelWithSpin::SetPolarization(G4ThreeVector polar)
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{
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parent_polarization = polar;
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}
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inline const G4ThreeVector& MuDecayChannelWithSpin::GetPolarization() const
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{
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return parent_polarization;
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}
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inline G4double MuDecayChannelWithSpin::F_c(G4double x, G4double x0)
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{
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G4double omega = std::log(EMMU/EMASS);
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G4double f_c;
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f_c = (5.+17.*x-34.*x*x)*(omega+std::log(x))-22.*x+34.*x*x;
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f_c = (1.-x)/(3.*x*x)*f_c;
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f_c = (6.-4.*x)*R_c(x)+(6.-6.*x)*std::log(x) + f_c;
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f_c = (fine_structure_const/twopi) * (x*x-x0*x0) * f_c;
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return f_c;
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}
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inline G4double MuDecayChannelWithSpin::F_theta(G4double x, G4double x0)
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{
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G4double omega = std::log(EMMU/EMASS);
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G4double f_theta;
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f_theta = (1.+x+34*x*x)*(omega+std::log(x))+3.-7.*x-32.*x*x;
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f_theta = f_theta + ((4.*(1.-x)*(1.-x))/x)*std::log(1.-x);
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f_theta = (1.-x)/(3.*x*x) * f_theta;
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f_theta = (2.-4.*x)*R_c(x)+(2.-6.*x)*std::log(x)-f_theta;
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f_theta = (fine_structure_const/twopi) * (x*x-x0*x0) * f_theta;
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return f_theta;
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}
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#endif
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