#include <G4MuonRadiativeDecayChannelWithSpin.hh>

Inheritance diagram for G4MuonRadiativeDecayChannelWithSpin:

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

virtual	~G4MuonRadiativeDecayChannelWithSpin ()

virtual G4DecayProducts *	DecayIt (G4double)

void	SetPolarization (G4ThreeVector)

const G4ThreeVector &	GetPolarization () const

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 ()

Protected Member Functions
	G4MuonRadiativeDecayChannelWithSpin (const G4MuonRadiativeDecayChannelWithSpin &)

G4MuonRadiativeDecayChannelWithSpin &	operator= (const G4MuonRadiativeDecayChannelWithSpin &)

Protected Member Functions inherited from G4VDecayChannel
void	ClearDaughtersName ()

void	FillDaughters ()

void	FillParent ()

	G4VDecayChannel ()

	G4VDecayChannel (const G4VDecayChannel &)

G4VDecayChannel &	operator= (const G4VDecayChannel &)

Additional Inherited Members
Protected Attributes inherited from G4VDecayChannel
G4String	kinematics_name

G4double	rbranch

G4int	numberOfDaughters

G4String *	parent_name

G4String **	daughters_name

G4ParticleTable *	particletable

G4int	verboseLevel

G4ParticleDefinition *	G4MT_parent

G4ParticleDefinition **	G4MT_daughters

G4double	G4MT_parent_mass

G4double *	G4MT_daughters_mass

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 60 of file G4MuonRadiativeDecayChannelWithSpin.cc.

References G4cout, G4endl, G4VDecayChannel::GetVerboseLevel(), G4VDecayChannel::SetBR(), G4VDecayChannel::SetDaughter(), G4VDecayChannel::SetNumberOfDaughters(), and G4VDecayChannel::SetParent().

Referenced by G4MuonRadiativeDecayChannelWithSpin().

          : G4VDecayChannel("Radiative Muon Decay",1),
            parent_polarization()
 {
   // 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
   }
 }

G4MuonRadiativeDecayChannelWithSpin::~G4MuonRadiativeDecayChannelWithSpin ( )

virtual

Definition at line 93 of file G4MuonRadiativeDecayChannelWithSpin.cc.

94 {

95 }

G4MuonRadiativeDecayChannelWithSpin::G4MuonRadiativeDecayChannelWithSpin ( const G4MuonRadiativeDecayChannelWithSpin & right )

protected

Definition at line 97 of file G4MuonRadiativeDecayChannelWithSpin.cc.

References G4MuonRadiativeDecayChannelWithSpin().

                                                                                                                         :
   G4VDecayChannel(right)
 {
   parent_polarization = right.parent_polarization;
 }

Member Function Documentation

G4DecayProducts * G4MuonRadiativeDecayChannelWithSpin::DecayIt ( G4double )

virtual

if(i<10000000)goto leap1:

Implements G4VDecayChannel.

Definition at line 132 of file G4MuonRadiativeDecayChannelWithSpin.cc.

References CLHEP::HepLorentzVector::boost(), G4DecayProducts::DumpInfo(), G4VDecayChannel::FillDaughters(), G4VDecayChannel::FillParent(), G4cout, G4endl, G4VDecayChannel::G4MT_daughters, G4VDecayChannel::G4MT_parent, G4UniformRand, G4DynamicParticle::Get4Momentum(), G4VDecayChannel::GetParentName(), G4ParticleDefinition::GetPDGMass(), G4DynamicParticle::GetTotalMomentum(), G4VDecayChannel::GetVerboseLevel(), G4INCL::Math::min(), G4DecayProducts::PushProducts(), python.hepunit::rad, CLHEP::Hep3Vector::rotateUz(), G4DynamicParticle::Set4Momentum(), python.hepunit::twopi, CLHEP::Hep3Vector::unit(), and test::x.

 {
 
 #ifdef G4VERBOSE
   if (GetVerboseLevel()>1) 
                  G4cout << "G4MuonRadiativeDecayChannelWithSpin::DecayIt ";
 #endif
 
   if (G4MT_parent == 0) FillParent();  
   if (G4MT_daughters == 0) FillDaughters();
 
   // 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, Qsqr, x, y, xx, yy, zz;
   G4double cthetaE, cthetaG, cthetaGE, phiE, phiG;
 
   do {
 
 //     leap1:
 
      i++;
 
 //     leap2:
 
      do {
 //
 //--------------------------------------------------------------------------
 //      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
 //
 ////      G4cout << " x, xx, yy, zz " << x  << " " << xx << " " 
 ////                                  << yy << " " << zz << G4endl;
 ////      G4cout << " phiE, cthetaE, sthetaE " << phiE    << " "
 ////                                           << cthetaE << " " 
 ////                                           << sthetaE << " " << G4endl;
 //
 //-----------------------------------------------------------------------
 //
 //      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
 //
 ////      G4cout << " y, xx, yy, zz " << y  << " " << xx << " "
 ////                                  << yy << " " << zz << G4endl;
 ////      G4cout << " phiG, cthetaG, sthetaG " << phiG    << " "
 ////                                           << cthetaG << " "
 ////                                           << sthetaG << " " << G4endl;
 //
 //-----------------------------------------------------------------------
 //
 //      Maybe certain restrictions on the kinematical variables:
 //
 ////      if (cthetaE    > 0.01)goto leap2;
 ////      if (cthetaG    > 0.01)goto leap2;
 ////      if (std::fabs(x-0.5) > 0.5 )goto leap2;
 ////      if (std::fabs(y-0.5) > 0.5 )goto leap2;
 //
 //-----------------------------------------------------------------------
 //
 //      Calculate the angle between positron and photon (cosine)
 //
         cthetaGE = cthetaE*cthetaG+sthetaE*sthetaG*std::cos(phiE-phiG);
 //
 ////      G4cout << x << " " << cthetaE << " " << sthetaE << " "
 ////             << y << " " << cthetaG << " " << sthetaG << " "
 ////             << cthetaGE
 //
 //-----------------------------------------------------------------------
 //
         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;
 
         Qsqr  = (1.0-term1-term3+term0+0.5*term6)/((1.0-eps)*(1.0-eps));
 //
 //-----------------------------------------------------------------------
 //
 //      Check the kinematics.
 //
      } while ( Qsqr<0.0 || Qsqr>1.0 );
 //
 ////   G4cout << x << " " << y << " " <<  beta << " " << Qsqr << G4endl;
 //
 //   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);
 //
 ////     if(som0<0.0){
 ////       G4cout << " som0 < 0 in Fronsdal " << som0 
 ////              << " at event " << i << G4endl;
 ////       G4cout << Pmu << " " << x << " " << y << " " 
 ////              << cthetaE << " " << cthetaG << " "
 ////              << cthetaGE << " " << som0 << G4endl;
 ////     }
 //
 //-----------------------------------------------------------------------
 //
 ////     G4cout << x << " " << y << " " << som0 << G4endl;
 //
 //----------------------------------------------------------------------
 //
 //   Sample the decay rate
 //
 
   } while (G4UniformRand()*177.0 > som0);
 
 ///   if(i<10000000)goto leap1:
 //
 //-----------------------------------------------------------------------
 //
   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 vmass   = std::sqrt((energy2-
                                 (daughtermomentum[0]+daughtermomentum[1]))*
                                (energy2+
                                 (daughtermomentum[0]+daughtermomentum[1])));
   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;
 }

const G4ThreeVector & G4MuonRadiativeDecayChannelWithSpin::GetPolarization ( ) const

inline

Definition at line 114 of file G4MuonRadiativeDecayChannelWithSpin.hh.

 {
   return parent_polarization;
 }

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

protected

Definition at line 103 of file G4MuonRadiativeDecayChannelWithSpin.cc.

References G4VDecayChannel::ClearDaughtersName(), G4VDecayChannel::daughters_name, G4VDecayChannel::kinematics_name, G4VDecayChannel::numberOfDaughters, G4VDecayChannel::parent_name, G4VDecayChannel::rbranch, and G4VDecayChannel::verboseLevel.

 {
   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;
 }

void G4MuonRadiativeDecayChannelWithSpin::SetPolarization ( G4ThreeVector polar )

inline

Definition at line 108 of file G4MuonRadiativeDecayChannelWithSpin.hh.

 {
   parent_polarization = polar;
 }

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

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation