G4PionDecayMakeSpin Class Reference

#include <G4PionDecayMakeSpin.hh>

Inheritance diagram for G4PionDecayMakeSpin:

Public Member Functions
	G4PionDecayMakeSpin (const G4String &processName="Decay")
virtual	~G4PionDecayMakeSpin ()
virtual void	ProcessDescription (std::ostream &outFile) const override
Public Member Functions inherited from G4Decay
	G4Decay (const G4String &processName="Decay")
virtual	~G4Decay ()
virtual G4VParticleChange *	PostStepDoIt (const G4Track &aTrack, const G4Step &aStep) override
virtual G4VParticleChange *	AtRestDoIt (const G4Track &aTrack, const G4Step &aStep) override
virtual void	BuildPhysicsTable (const G4ParticleDefinition &) override
virtual G4bool	IsApplicable (const G4ParticleDefinition &) override
virtual G4double	AtRestGetPhysicalInteractionLength (const G4Track &track, G4ForceCondition *condition) override
virtual G4double	PostStepGetPhysicalInteractionLength (const G4Track &track, G4double previousStepSize, G4ForceCondition *condition) override
virtual void	StartTracking (G4Track *) override
virtual void	EndTracking () override
void	SetExtDecayer (G4VExtDecayer *)
const G4VExtDecayer *	GetExtDecayer () const
G4double	GetRemainderLifeTime () const
Public Member Functions inherited from G4VRestDiscreteProcess
	G4VRestDiscreteProcess (const G4String &, G4ProcessType aType=fNotDefined)
	G4VRestDiscreteProcess (G4VRestDiscreteProcess &)
virtual	~G4VRestDiscreteProcess ()
G4VRestDiscreteProcess &	operator= (const G4VRestDiscreteProcess &)=delete
virtual G4double	AlongStepGetPhysicalInteractionLength (const G4Track &, G4double, G4double, G4double &, G4GPILSelection *)
virtual G4VParticleChange *	AlongStepDoIt (const G4Track &, const G4Step &)
Public Member Functions inherited from G4VProcess
	G4VProcess (const G4String &aName="NoName", G4ProcessType aType=fNotDefined)
	G4VProcess (const G4VProcess &right)
virtual	~G4VProcess ()
G4VProcess &	operator= (const G4VProcess &)=delete
G4bool	operator== (const G4VProcess &right) const
G4bool	operator!= (const G4VProcess &right) const
G4double	GetCurrentInteractionLength () const
void	SetPILfactor (G4double value)
G4double	GetPILfactor () const
G4double	AlongStepGPIL (const G4Track &track, G4double previousStepSize, G4double currentMinimumStep, G4double &proposedSafety, G4GPILSelection *selection)
G4double	AtRestGPIL (const G4Track &track, G4ForceCondition *condition)
G4double	PostStepGPIL (const G4Track &track, G4double previousStepSize, G4ForceCondition *condition)
virtual void	PreparePhysicsTable (const G4ParticleDefinition &)
virtual G4bool	StorePhysicsTable (const G4ParticleDefinition *, const G4String &, G4bool)
virtual G4bool	RetrievePhysicsTable (const G4ParticleDefinition *, const G4String &, G4bool)
const G4String &	GetPhysicsTableFileName (const G4ParticleDefinition *, const G4String &directory, const G4String &tableName, G4bool ascii=false)
const G4String &	GetProcessName () const
G4ProcessType	GetProcessType () const
void	SetProcessType (G4ProcessType)
G4int	GetProcessSubType () const
void	SetProcessSubType (G4int)
virtual const G4VProcess *	GetCreatorProcess () const
virtual void	SetProcessManager (const G4ProcessManager *)
virtual const G4ProcessManager *	GetProcessManager ()
virtual void	ResetNumberOfInteractionLengthLeft ()
G4double	GetNumberOfInteractionLengthLeft () const
G4double	GetTotalNumberOfInteractionLengthTraversed () const
G4bool	isAtRestDoItIsEnabled () const
G4bool	isAlongStepDoItIsEnabled () const
G4bool	isPostStepDoItIsEnabled () const
virtual void	DumpInfo () const
void	SetVerboseLevel (G4int value)
G4int	GetVerboseLevel () const
virtual void	SetMasterProcess (G4VProcess *masterP)
const G4VProcess *	GetMasterProcess () const
virtual void	BuildWorkerPhysicsTable (const G4ParticleDefinition &part)
virtual void	PrepareWorkerPhysicsTable (const G4ParticleDefinition &)

Protected Member Functions
virtual void	DaughterPolarization (const G4Track &aTrack, G4DecayProducts *products) override
Protected Member Functions inherited from G4Decay
virtual G4VParticleChange *	DecayIt (const G4Track &aTrack, const G4Step &aStep)
virtual G4double	GetMeanFreePath (const G4Track &aTrack, G4double previousStepSize, G4ForceCondition *condition) override
virtual G4double	GetMeanLifeTime (const G4Track &aTrack, G4ForceCondition *condition) override
Protected Member Functions inherited from G4VProcess
void	SubtractNumberOfInteractionLengthLeft (G4double prevStepSize)
void	ClearNumberOfInteractionLengthLeft ()

Additional Inherited Members
Static Public Member Functions inherited from G4VProcess
static const G4String &	GetProcessTypeName (G4ProcessType)
Protected Attributes inherited from G4Decay
G4int	verboseLevel
const G4double	HighestValue
G4double	fRemainderLifeTime
G4ParticleChangeForDecay	fParticleChangeForDecay
G4VExtDecayer *	pExtDecayer
Protected Attributes inherited from G4VProcess
const G4ProcessManager *	aProcessManager = nullptr
G4VParticleChange *	pParticleChange = nullptr
G4ParticleChange	aParticleChange
G4double	theNumberOfInteractionLengthLeft = -1.0
G4double	currentInteractionLength = -1.0
G4double	theInitialNumberOfInteractionLength = -1.0
G4String	theProcessName
G4String	thePhysicsTableFileName
G4ProcessType	theProcessType = fNotDefined
G4int	theProcessSubType = -1
G4double	thePILfactor = 1.0
G4int	verboseLevel = 0
G4bool	enableAtRestDoIt = true
G4bool	enableAlongStepDoIt = true
G4bool	enablePostStepDoIt = true

Detailed Description

Definition at line 39 of file G4PionDecayMakeSpin.hh.

Constructor & Destructor Documentation

G4PionDecayMakeSpin()

G4PionDecayMakeSpin::G4PionDecayMakeSpin

(

const G4String &

processName = "Decay"

)

Definition at line 38 of file G4PionDecayMakeSpin.cc.

                               : G4Decay(processName) 
{
  // set Process Sub Type
  SetProcessSubType(static_cast<int>(DECAY_PionMakeSpin));
 
}

~G4PionDecayMakeSpin()

G4PionDecayMakeSpin::~G4PionDecayMakeSpin ( )

virtual

Definition at line 46 of file G4PionDecayMakeSpin.cc.

{ }

Member Function Documentation

DaughterPolarization()

void G4PionDecayMakeSpin::DaughterPolarization ( const G4Track & aTrack, G4DecayProducts * products )

overrideprotectedvirtual

Reimplemented from G4Decay.

Definition at line 48 of file G4PionDecayMakeSpin.cc.

{
  //  This routine deals only with particles that can decay into a muon
  //                 pi+, pi-, K+, K- and K0_long
 
  // get particle
 
  const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
  const G4ParticleDefinition* aParticleDef = aParticle->GetDefinition();
 
  G4ParticleDefinition* aMuonPlus =
            G4ParticleTable::GetParticleTable()->FindParticle("mu+");
  G4ParticleDefinition* aMuonMinus =
            G4ParticleTable::GetParticleTable()->FindParticle("mu-");
  G4ParticleDefinition* aPionPlus = 
            G4ParticleTable::GetParticleTable()->FindParticle("pi+");
  G4ParticleDefinition* aPionMinus =
            G4ParticleTable::GetParticleTable()->FindParticle("pi-");
  G4ParticleDefinition* aKaonPlus =
            G4ParticleTable::GetParticleTable()->FindParticle("kaon+");
  G4ParticleDefinition* aKaonMinus =
            G4ParticleTable::GetParticleTable()->FindParticle("kaon-");
  G4ParticleDefinition* aKaon0Long =
            G4ParticleTable::GetParticleTable()->FindParticle("kaon0L");
  G4ParticleDefinition* aNeutrinoMu =
            G4ParticleTable::GetParticleTable()->FindParticle("nu_mu");
  G4ParticleDefinition* aAntiNeutrinoMu =
            G4ParticleTable::GetParticleTable()->FindParticle("anti_nu_mu");
 
  if( aParticleDef == aPionPlus   ||
      aParticleDef == aPionMinus  || 
      aParticleDef == aKaonPlus   ||
      aParticleDef == aKaonMinus  ||
      aParticleDef == aKaon0Long ) {
  } else {
      return;
  }
 
  G4DynamicParticle* aMuon = nullptr;
 
  G4double emu(0), eneutrino(0);
  G4ThreeVector p_muon, p_neutrino;
 
  G4int numberOfSecondaries = products->entries();
 
  if (numberOfSecondaries > 0) {
    for (G4int index=0; index < numberOfSecondaries; index++){
      G4DynamicParticle* aSecondary = (*products)[index];
      const G4ParticleDefinition* aSecondaryDef = aSecondary->GetDefinition();
      
      if (aSecondaryDef == aMuonPlus ||
      aSecondaryDef == aMuonMinus ) {
    //          Muon+ or Muon-
    aMuon = aSecondary;
    emu    = aSecondary->GetTotalEnergy();
    p_muon = aSecondary->GetMomentum();
      } else if (aSecondaryDef == aNeutrinoMu ||
         aSecondaryDef == aAntiNeutrinoMu ) {
    //          Muon-Neutrino / Muon-Anti-Neutrino
    eneutrino  = aSecondary->GetTotalEnergy();
    p_neutrino = aSecondary->GetMomentum();
      }
    }
  }
 
  //  This routine deals only with decays with a 
  //  muon and mu-(anti)neutrinos in the final state
  if (aMuon == nullptr) return;
  if (eneutrino==0||emu==0) return;
 
  G4ThreeVector spin(0,0,0);
 
  const G4DynamicParticle* theParentParticle = products->GetParentParticle();
 
  G4double amass = theParentParticle->GetMass();
  G4double emmu = aMuonPlus->GetPDGMass();
 
  if (numberOfSecondaries == 2 ) {
     G4double scale = - (eneutrino - ( p_muon * p_neutrino )/(emu+emmu));
 
     p_muon = scale * p_muon;
     p_neutrino = emmu * p_neutrino;
     spin = p_muon + p_neutrino;
 
     scale = 2./(amass*amass-emmu*emmu);
     spin = scale * spin;
 
     if (aParticle->GetCharge() < 0.0) spin = -spin;
 
  } else {
       spin = G4RandomDirection();
 
  }
 
  spin = spin.unit();
 
  aMuon->SetPolarization(spin.x(),spin.y(),spin.z());
 
  return; 
}

ProcessDescription()

void G4PionDecayMakeSpin::ProcessDescription ( std::ostream & outFile ) const

overridevirtual

Reimplemented from G4Decay.

Definition at line 150 of file G4PionDecayMakeSpin.cc.

{
  outFile << GetProcessName() 
      << ": Decay of mesons that can decay into a muon \n"
      << " i.e. pi+, pi-, K+, K- and K0_long \n"
      << " kinematics of daughters are dertermined by DecayChannels \n"
      << " polarization of daughter particles are take into account. \n";
}

---

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

• G4PionDecayMakeSpin.hh
• G4PionDecayMakeSpin.cc