G4MuonDecayChannel Class Reference

#include <G4MuonDecayChannel.hh>

Inheritance diagram for G4MuonDecayChannel:

Public Member Functions
	G4MuonDecayChannel (const G4String &theParentName, G4double theBR)
virtual	~G4MuonDecayChannel ()
virtual G4DecayProducts *	DecayIt (G4double)
Protected Member Functions
	G4MuonDecayChannel (const G4MuonDecayChannel &)
G4MuonDecayChannel &	operator= (const G4MuonDecayChannel &)
	G4MuonDecayChannel ()

---

Detailed Description

Definition at line 43 of file G4MuonDecayChannel.hh.

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Constructor & Destructor Documentation

G4MuonDecayChannel::G4MuonDecayChannel	(	const G4String &	theParentName,
		G4double	theBR
	)

Definition at line 59 of file G4MuonDecayChannel.cc.

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

                   :G4VDecayChannel("Muon Decay",1)
{
  // set names for daughter particles
  if (theParentName == "mu+") {
    SetBR(theBR);
    SetParent("mu+");
    SetNumberOfDaughters(3);
    SetDaughter(0, "e+");
    SetDaughter(1, "nu_e");
    SetDaughter(2, "anti_nu_mu");
  } else if (theParentName == "mu-") {
    SetBR(theBR);
    SetParent("mu-");
    SetNumberOfDaughters(3);
    SetDaughter(0, "e-");
    SetDaughter(1, "anti_nu_e");
    SetDaughter(2, "nu_mu");
  } else {
#ifdef G4VERBOSE
    if (GetVerboseLevel()>0) {
      G4cout << "G4MuonDecayChannel:: constructor :";
      G4cout << " parent particle is not muon but ";
      G4cout << theParentName << G4endl;
    }
#endif
  }
}

G4MuonDecayChannel::~G4MuonDecayChannel

(

)

[virtual]

Definition at line 94 of file G4MuonDecayChannel.cc.

{
}

G4MuonDecayChannel::G4MuonDecayChannel

(

const G4MuonDecayChannel &

)

[protected]

Definition at line 89 of file G4MuonDecayChannel.cc.

                                                                     :
  G4VDecayChannel(right)
{
}

G4MuonDecayChannel::G4MuonDecayChannel

(

)

[protected]

Definition at line 54 of file G4MuonDecayChannel.cc.

                   :G4VDecayChannel()
{
}

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Member Function Documentation

G4DecayProducts * G4MuonDecayChannel::DecayIt

(

G4double

)

[virtual]

Implements G4VDecayChannel.

Reimplemented in G4MuonDecayChannelWithSpin.

Definition at line 125 of file G4MuonDecayChannel.cc.

References G4VDecayChannel::daughters, G4DecayProducts::DumpInfo(), G4VDecayChannel::FillDaughters(), G4VDecayChannel::FillParent(), G4cout, G4endl, G4UniformRand, G4InuclParticleNames::gam, G4ParticleDefinition::GetPDGMass(), G4VDecayChannel::GetVerboseLevel(), G4VDecayChannel::parent, and G4DecayProducts::PushProducts().

{
  // this version neglects muon polarization,and electron mass  
  //              assumes the pure V-A coupling
  //              the Neutrinos are correctly V-A. 
#ifdef G4VERBOSE
  if (GetVerboseLevel()>1) G4cout << "G4MuonDecayChannel::DecayIt ";
#endif

  if (parent == 0) FillParent();  
  if (daughters == 0) FillDaughters();
 
  // parent mass
  G4double parentmass = parent->GetPDGMass();

  //daughters'mass
  G4double daughtermass[3]; 
  G4double sumofdaughtermass = 0.0;
  for (G4int index=0; index<3; index++){
    daughtermass[index] = daughters[index]->GetPDGMass();
    sumofdaughtermass += daughtermass[index];
  }

   //create parent G4DynamicParticle at rest
  G4ThreeVector dummy;
  G4DynamicParticle * parentparticle = new G4DynamicParticle( parent, dummy, 0.0);
  //create G4Decayproducts
  G4DecayProducts *products = new G4DecayProducts(*parentparticle);
  delete parentparticle;

  // calculate daughter momentum
  G4double daughtermomentum[3];
    // calcurate electron energy
  G4double xmax = (1.0+daughtermass[0]*daughtermass[0]/parentmass/parentmass);
  G4double x;
  
  G4double Ee,Ene;
  
  G4double gam;
   G4double EMax=parentmass/2-daughtermass[0];
   
  
   //Generating Random Energy
do {
  Ee=G4UniformRand();
    do{
      x=xmax*G4UniformRand();
      gam=G4UniformRand();
    }while (gam >x*(1.-x));
    Ene=x;
  } while ( Ene < (1.-Ee));
 G4double Enm=(2.-Ee-Ene);


 //initialisation of rotation parameters

  G4double costheta,sintheta,rphi,rtheta,rpsi;
  costheta= 1.-2./Ee-2./Ene+2./Ene/Ee;
  sintheta=std::sqrt(1.-costheta*costheta);
  

  rphi=twopi*G4UniformRand()*rad;
  rtheta=(std::acos(2.*G4UniformRand()-1.));
  rpsi=twopi*G4UniformRand()*rad;

  G4RotationMatrix rot;
  rot.set(rphi,rtheta,rpsi);

  //electron 0
  daughtermomentum[0]=std::sqrt(Ee*Ee*EMax*EMax+2.0*Ee*EMax * daughtermass[0]);
  G4ThreeVector direction0(0.0,0.0,1.0);

  direction0 *= rot;

  G4DynamicParticle * daughterparticle = new G4DynamicParticle ( daughters[0],   direction0 * daughtermomentum[0]);

  products->PushProducts(daughterparticle);
  
  //electronic neutrino  1

  daughtermomentum[1]=std::sqrt(Ene*Ene*EMax*EMax+2.0*Ene*EMax * daughtermass[1]);
  G4ThreeVector direction1(sintheta,0.0,costheta);

  direction1 *= rot;

  G4DynamicParticle * daughterparticle1 = new G4DynamicParticle ( daughters[1],  direction1 * daughtermomentum[1]);
  products->PushProducts(daughterparticle1);

  //muonnic neutrino 2
  
     daughtermomentum[2]=std::sqrt(Enm*Enm*EMax*EMax +2.0*Enm*EMax*daughtermass[2]);
  G4ThreeVector direction2(-Ene/Enm*sintheta,0,-Ee/Enm-Ene/Enm*costheta);

  direction2 *= rot;

  G4DynamicParticle * daughterparticle2 = new G4DynamicParticle ( daughters[2],
         direction2 * daughtermomentum[2]);
  products->PushProducts(daughterparticle2);




 // output message
#ifdef G4VERBOSE
  if (GetVerboseLevel()>1) {
    G4cout << "G4MuonDecayChannel::DecayIt ";
    G4cout << "  create decay products in rest frame " <<G4endl;
    products->DumpInfo();
  }
#endif
  return products;
}

G4MuonDecayChannel & G4MuonDecayChannel::operator=

(

const G4MuonDecayChannel &

)

[protected]

Definition at line 98 of file G4MuonDecayChannel.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]);
      }
    }
  }
  return *this;
}

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

• G4MuonDecayChannel.hh
• G4MuonDecayChannel.cc

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