#include <G4MuonRadiativeDecayChannelWithSpin.hh>

Inheritance diagram for G4MuonRadiativeDecayChannelWithSpin:

Collaboration diagram for G4MuonRadiativeDecayChannelWithSpin:

Public Member Functions
	G4MuonRadiativeDecayChannelWithSpin (const G4String &theParentName, G4double theBR)

virtual	~G4MuonRadiativeDecayChannelWithSpin ()

virtual G4DecayProducts *	DecayIt (G4double)

Public Member Functions inherited from G4VDecayChannel
	G4VDecayChannel (const G4String &aName, G4int Verbose=1)

	G4VDecayChannel (const G4String &aName, const G4String &theParentName, G4double theBR, G4int theNumberOfDaughters, const G4String &theDaughterName1, const G4String &theDaughterName2="", const G4String &theDaughterName3="", const G4String &theDaughterName4="")

virtual	~G4VDecayChannel ()

G4int	operator== (const G4VDecayChannel &right) const

G4int	operator!= (const G4VDecayChannel &right) const

G4int	operator< (const G4VDecayChannel &right) const

const G4String &	GetKinematicsName () const

G4double	GetBR () const

G4int	GetNumberOfDaughters () const

G4ParticleDefinition *	GetParent ()

G4ParticleDefinition *	GetDaughter (G4int anIndex)

G4int	GetAngularMomentum ()

const G4String &	GetParentName () const

const G4String &	GetDaughterName (G4int anIndex) const

G4double	GetParentMass () const

G4double	GetDaughterMass (G4int anIndex) const

void	SetParent (const G4ParticleDefinition *particle_type)

void	SetParent (const G4String &particle_name)

void	SetBR (G4double value)

void	SetNumberOfDaughters (G4int value)

void	SetDaughter (G4int anIndex, const G4ParticleDefinition *particle_type)

void	SetDaughter (G4int anIndex, const G4String &particle_name)

void	SetVerboseLevel (G4int value)

G4int	GetVerboseLevel () const

void	DumpInfo ()

G4double	GetRangeMass () const

void	SetRangeMass (G4double val)

virtual G4bool	IsOKWithParentMass (G4double parentMass)

void	SetPolarization (const G4ThreeVector &)

const G4ThreeVector &	GetPolarization () const

Protected Member Functions
	G4MuonRadiativeDecayChannelWithSpin (const G4MuonRadiativeDecayChannelWithSpin &)

G4MuonRadiativeDecayChannelWithSpin &	operator= (const G4MuonRadiativeDecayChannelWithSpin &)

Protected Member Functions inherited from G4VDecayChannel
void	ClearDaughtersName ()

void	CheckAndFillDaughters ()

void	CheckAndFillParent ()

	G4VDecayChannel ()

	G4VDecayChannel (const G4VDecayChannel &)

G4VDecayChannel &	operator= (const G4VDecayChannel &)

G4double	DynamicalMass (G4double massPDG, G4double width, G4double maxDev=+1.) const

Additional Inherited Members
Protected Attributes inherited from G4VDecayChannel
G4String	kinematics_name

G4double	rbranch

G4int	numberOfDaughters

G4String *	parent_name

G4String **	daughters_name

G4double	rangeMass

G4ThreeVector	parent_polarization

G4ParticleTable *	particletable

G4int	verboseLevel

G4ParticleDefinition *	G4MT_parent

G4ParticleDefinition **	G4MT_daughters

G4double	G4MT_parent_mass

G4double *	G4MT_daughters_mass

G4double *	G4MT_daughters_width

G4Mutex	daughtersMutex

G4Mutex	parentMutex

Static Protected Attributes inherited from G4VDecayChannel
static const G4String	noName = " "

Detailed Description

Definition at line 61 of file G4MuonRadiativeDecayChannelWithSpin.hh.

Constructor & Destructor Documentation

G4MuonRadiativeDecayChannelWithSpin::G4MuonRadiativeDecayChannelWithSpin	(	const G4String &	theParentName,
		G4double	theBR
	)

Definition at line 59 of file G4MuonRadiativeDecayChannelWithSpin.cc.

          : G4VDecayChannel("Radiative Muon Decay",1)
 {
   // set names for daughter particles
   if (theParentName == "mu+") {
     SetBR(theBR);
     SetParent("mu+");
     SetNumberOfDaughters(4);
     SetDaughter(0, "e+");
     SetDaughter(1, "gamma");
     SetDaughter(2, "nu_e");
     SetDaughter(3, "anti_nu_mu");
   } else if (theParentName == "mu-") {
     SetBR(theBR);
     SetParent("mu-");
     SetNumberOfDaughters(4);
     SetDaughter(0, "e-");
     SetDaughter(1, "gamma");
     SetDaughter(2, "anti_nu_e");
     SetDaughter(3, "nu_mu");
   } else {
 #ifdef G4VERBOSE
     if (GetVerboseLevel()>0) {
       G4cout << "G4RadiativeMuonDecayChannel:: constructor :";
       G4cout << " parent particle is not muon but ";
       G4cout << theParentName << G4endl;
     }
 #endif
   }
 }

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G4MuonRadiativeDecayChannelWithSpin::~G4MuonRadiativeDecayChannelWithSpin ( )

virtual

Definition at line 91 of file G4MuonRadiativeDecayChannelWithSpin.cc.

92 {

93 }

G4MuonRadiativeDecayChannelWithSpin::G4MuonRadiativeDecayChannelWithSpin ( const G4MuonRadiativeDecayChannelWithSpin & right )

protected

Definition at line 95 of file G4MuonRadiativeDecayChannelWithSpin.cc.

                                                                                                                         :
   G4VDecayChannel(right)
 {
 }

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Member Function Documentation

G4DecayProducts * G4MuonRadiativeDecayChannelWithSpin::DecayIt ( G4double )

virtual

if(i<10000000)goto leap1:

Implements G4VDecayChannel.

Definition at line 129 of file G4MuonRadiativeDecayChannelWithSpin.cc.

 {
 
 #ifdef G4VERBOSE
   if (GetVerboseLevel()>1) 
                  G4cout << "G4MuonRadiativeDecayChannelWithSpin::DecayIt ";
 #endif
 
   CheckAndFillParent();
   CheckAndFillDaughters();
 
   // parent mass
   G4double parentmass = G4MT_parent->GetPDGMass();
 
   G4double EMMU = parentmass;
 
   //daughters'mass
   G4double daughtermass[4]; 
   G4double sumofdaughtermass = 0.0;
   for (G4int index=0; index<4; index++){
     daughtermass[index] = G4MT_daughters[index]->GetPDGMass();
     sumofdaughtermass += daughtermass[index];
   }
 
   G4double EMASS = daughtermass[0];
 
   //create parent G4DynamicParticle at rest
   G4ThreeVector dummy;
   G4DynamicParticle * parentparticle = 
                                new G4DynamicParticle( G4MT_parent, dummy, 0.0);
   //create G4Decayproducts
   G4DecayProducts *products = new G4DecayProducts(*parentparticle);
   delete parentparticle;
 
   G4int i = 0;
 
   G4double eps = EMASS/EMMU;
 
   G4double som0, x, y, xx, yy, zz;
   G4double cthetaE, cthetaG, cthetaGE, phiE, phiG;
   const size_t MAX_LOOP=10000;
 
   for (size_t loop_counter1=0; loop_counter1 <MAX_LOOP; ++loop_counter1){
 
 //     leap1:
 
      i++;
 
 //     leap2:
 
      for (size_t loop_counter2=0; loop_counter2 <MAX_LOOP; ++loop_counter2){
 //
 //--------------------------------------------------------------------------
 //      Build two vectors of random length and random direction, for the
 //      positron and the photon.
 //      x/y is the length of the vector, xx, yy and zz the components,
 //      phi is the azimutal angle, theta the polar angle.
 //--------------------------------------------------------------------------
 //
 //      For the positron
 //
         x = G4UniformRand();
 
         rn3dim(xx,yy,zz,x);
 
         if(std::fabs((xx*xx)+(yy*yy)+(zz*zz)-(x*x))>0.001){
           G4cout << "Norm of x not correct" << G4endl;
         }
 
         phiE = atan4(xx,yy);
         cthetaE = zz/x;
         G4double sthetaE = std::sqrt((xx*xx)+(yy*yy))/x;
 //
 //      What you get:
 //
 //      x       = positron energy
 //      phiE    = azimutal angle of positron momentum
 //      cthetaE = cosine of polar angle of positron momentum
 //      sthetaE = sine of polar angle of positron momentum
 //
 //
 //-----------------------------------------------------------------------
 //
 //      For the photon
 //
         y = G4UniformRand();
 
         rn3dim(xx,yy,zz,y);
 
         if(std::fabs((xx*xx)+(yy*yy)+(zz*zz)-(y*y))>0.001){
           G4cout << " Norm of y not correct " << G4endl;
         }
 
         phiG = atan4(xx,yy);
         cthetaG = zz/y;
         G4double sthetaG = std::sqrt((xx*xx)+(yy*yy))/y;
 //
 //      What you get:
 //
 //      y       = photon energy
 //      phiG    = azimutal angle of photon momentum
 //      cthetaG = cosine of polar angle of photon momentum
 //      sthetaG = sine of polar angle of photon momentum
 //
 //
 //-----------------------------------------------------------------------
 //
 //      Maybe certain restrictions on the kinematical variables:
 //
 //
 //-----------------------------------------------------------------------
 //
 //      Calculate the angle between positron and photon (cosine)
 //
         cthetaGE = cthetaE*cthetaG+sthetaE*sthetaG*std::cos(phiE-phiG);
 //
 //
 //-----------------------------------------------------------------------
 //
         G4double term0 = eps*eps;
         G4double term1 = x*((1.0-eps)*(1.0-eps))+2.0*eps;
         G4double beta  = std::sqrt( x*((1.0-eps)*(1.0-eps))*
                                    (x*((1.0-eps)*(1.0-eps))+4.0*eps))/term1;
         G4double delta = 1.0-beta*cthetaGE;
 
         G4double term3 = y*(1.0-(eps*eps));
         G4double term6 = term1*delta*term3;
 
         G4double Qsqr = (1.0-term1-term3+term0+0.5*term6)/((1.0-eps)*(1.0-eps));
 //
 //-----------------------------------------------------------------------
 //
 //      Check the kinematics.
 //
     if  ( Qsqr>=0.0 && Qsqr<=1.0 ) break;
      }
 //
 //
 //   Do the calculation for -1 muon polarization (i.e. mu+)
 //
      G4double Pmu = -1.0;
      if (GetParentName() == "mu-")Pmu = +1.0;
 //
 //   and for Fronsdal
 //
 //-----------------------------------------------------------------------
 //
      som0 = fron(Pmu,x,y,cthetaE,cthetaG,cthetaGE);
 //
 //
 //-----------------------------------------------------------------------
 //
 //
 //----------------------------------------------------------------------
 //
 //   Sample the decay rate
 //
 
      if (G4UniformRand()*177.0 <= som0) break;
   }
 
 //
 //-----------------------------------------------------------------------
 //
   G4double E = EMMU/2.*(x*((1.-eps)*(1.-eps))+2.*eps);
   G4double G = EMMU/2.*y*(1.-eps*eps);
 //
 //-----------------------------------------------------------------------
 //
 
   if(E < EMASS) E = EMASS;
 
   // calculate daughter momentum
   G4double daughtermomentum[4];
 
   daughtermomentum[0] = std::sqrt(E*E - EMASS*EMASS);
 
   G4double sthetaE = std::sqrt(1.-cthetaE*cthetaE);
   G4double cphiE = std::cos(phiE);
   G4double sphiE = std::sin(phiE);
 
   //Coordinates of the decay positron with respect to the muon spin
 
   G4double px = sthetaE*cphiE;
   G4double py = sthetaE*sphiE;
   G4double pz = cthetaE;
 
   G4ThreeVector direction0(px,py,pz);
 
   direction0.rotateUz(parent_polarization);
 
   G4DynamicParticle * daughterparticle0 
     = new G4DynamicParticle( G4MT_daughters[0], daughtermomentum[0]*direction0);
 
   products->PushProducts(daughterparticle0);
 
   daughtermomentum[1] = G;
 
   G4double sthetaG = std::sqrt(1.-cthetaG*cthetaG);
   G4double cphiG = std::cos(phiG);
   G4double sphiG = std::sin(phiG);
 
   //Coordinates of the decay gamma with respect to the muon spin
 
   px = sthetaG*cphiG;
   py = sthetaG*sphiG;
   pz = cthetaG;
 
   G4ThreeVector direction1(px,py,pz);
 
   direction1.rotateUz(parent_polarization);
 
   G4DynamicParticle * daughterparticle1
     = new G4DynamicParticle( G4MT_daughters[1], daughtermomentum[1]*direction1);
 
   products->PushProducts(daughterparticle1);
 
   // daughter 3 ,4 (neutrinos)
   // create neutrinos in the C.M frame of two neutrinos
 
   G4double energy2 = parentmass*(1.0 - (x+y)/2.0);
 
   G4double vmass2 = energy2*energy2 -
                     (daughtermomentum[0]*direction0+daughtermomentum[1]*direction1)*
                     (daughtermomentum[0]*direction0+daughtermomentum[1]*direction1);
   G4double vmass = std::sqrt(vmass2);
 
   G4double beta = (daughtermomentum[0]+daughtermomentum[1])/energy2;
   beta = -1.0 * std::min(beta,0.99);
 
   G4double costhetan = 2.*G4UniformRand()-1.0;
   G4double sinthetan = std::sqrt((1.0-costhetan)*(1.0+costhetan));
   G4double phin  = twopi*G4UniformRand()*rad;
   G4double sinphin = std::sin(phin);
   G4double cosphin = std::cos(phin);
 
   G4ThreeVector direction2(sinthetan*cosphin,sinthetan*sinphin,costhetan);
 
   G4DynamicParticle * daughterparticle2
     = new G4DynamicParticle( G4MT_daughters[2], direction2*(vmass/2.));
   G4DynamicParticle * daughterparticle3
     = new G4DynamicParticle( G4MT_daughters[3], direction2*(-1.0*vmass/2.));
 
   // boost to the muon rest frame
 
   G4ThreeVector direction34(direction0.x()+direction1.x(),
                             direction0.y()+direction1.y(),
                             direction0.z()+direction1.z());
   direction34 = direction34.unit();
 
   G4LorentzVector p4 = daughterparticle2->Get4Momentum();
   p4.boost(direction34.x()*beta,direction34.y()*beta,direction34.z()*beta);
   daughterparticle2->Set4Momentum(p4);
 
   p4 = daughterparticle3->Get4Momentum();
   p4.boost(direction34.x()*beta,direction34.y()*beta,direction34.z()*beta);
   daughterparticle3->Set4Momentum(p4);
 
   products->PushProducts(daughterparticle2);
   products->PushProducts(daughterparticle3);
 
   daughtermomentum[2] = daughterparticle2->GetTotalMomentum();
   daughtermomentum[3] = daughterparticle3->GetTotalMomentum();
 
 // output message
 #ifdef G4VERBOSE
   if (GetVerboseLevel()>1) {
     G4cout << "G4MuonRadiativeDecayChannelWithSpin::DecayIt ";
     G4cout << "  create decay products in rest frame " <<G4endl;
     products->DumpInfo();
   }
 #endif
   return products;
 }

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G4MuonRadiativeDecayChannelWithSpin & G4MuonRadiativeDecayChannelWithSpin::operator= ( const G4MuonRadiativeDecayChannelWithSpin & right )

protected

Definition at line 100 of file G4MuonRadiativeDecayChannelWithSpin.cc.

 {
   if (this != &right) { 
     kinematics_name = right.kinematics_name;
     verboseLevel = right.verboseLevel;
     rbranch = right.rbranch;
 
     // copy parent name
     parent_name = new G4String(*right.parent_name);
 
     // clear daughters_name array
     ClearDaughtersName();
 
     // recreate array
     numberOfDaughters = right.numberOfDaughters;
     if ( numberOfDaughters >0 ) {
       if (daughters_name !=0) ClearDaughtersName();
       daughters_name = new G4String*[numberOfDaughters];
       //copy daughters name
       for (G4int index=0; index < numberOfDaughters; index++) {
           daughters_name[index] = new G4String(*right.daughters_name[index]);
       }
     }
     parent_polarization = right.parent_polarization;
   }
   return *this;
 }

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The documentation for this class was generated from the following files:

geant4.10.03.p01/source/particles/management/include/G4MuonRadiativeDecayChannelWithSpin.hh
geant4.10.03.p01/source/particles/management/src/G4MuonRadiativeDecayChannelWithSpin.cc

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation