#include <acts/blob/sPHENIX/Fatras/include/ActsFatras/Physics/ElectroMagnetic/PhotonConversion.hpp>

Public Types
using	Scalar = ActsFatras::Particle::Scalar

Public Member Functions
template<typename generator_t >
std::pair< Scalar, Scalar >	generatePathLimits (generator_t &generator, const Particle &particle) const

template<typename generator_t >
bool	run (generator_t &generator, Particle &particle, std::vector< Particle > &generated) const

Public Attributes
Scalar	childEnergyScaleFactor = 2.
	Scaling factor of children energy.

Scalar	conversionProbScaleFactor = 0.98
	Scaling factor for photon conversion probability.

Private Member Functions
std::array< Particle, 2 >	generateChildren (const Particle &photon, Scalar childEnergy, const Particle::Vector3 &childDirection) const

template<typename generator_t >
Scalar	generateFirstChildEnergyFraction (generator_t &generator, Scalar gammaMom) const

template<typename generator_t >
Particle::Vector3	generateChildDirection (generator_t &generator, const Particle &particle) const

Scalar	screenFunction1 (Scalar delta) const

Scalar	screenFunction2 (Scalar delta) const

Static Private Attributes
static const Scalar	kElectronMass

Detailed Description

This class handles the photon conversion. It evaluates the distance after which the interaction will occur and the final state due the interaction itself.

Definition at line 34 of file PhotonConversion.hpp.

View newest version in sPHENIX GitHub at line 34 of file PhotonConversion.hpp

Member Typedef Documentation

using ActsFatras::PhotonConversion::Scalar = ActsFatras::Particle::Scalar

Definition at line 36 of file PhotonConversion.hpp.

View newest version in sPHENIX GitHub at line 36 of file PhotonConversion.hpp

Member Function Documentation

template<typename generator_t >

Particle::Vector3 ActsFatras::PhotonConversion::generateChildDirection	(	generator_t &	generator,
		const Particle &	particle
	)		const

private

Generate the direction of the child particles.

Template Parameters

generator_t Type of the random number generator

Parameters

[in,out]	generator	The random number generator
[in]	particle	The photon

Returns: The direction vector of the child particle

This method is based upon the Athena class PhotonConversionTool

Definition at line 226 of file PhotonConversion.hpp.

View newest version in sPHENIX GitHub at line 226 of file PhotonConversion.hpp

References ActsFatras::Particle::direction(), ActsFatras::Particle::energy(), kElectronMass, Acts::makeCurvilinearUnitU(), ActsTests::PropagationDatasets::theta, and physmon_ckf_tracking::u.

Referenced by run().

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std::array< Particle, 2 > ActsFatras::PhotonConversion::generateChildren	(	const Particle &	photon,
		Scalar	childEnergy,
		const Particle::Vector3 &	childDirection
	)		const

private

This method constructs and returns the child particles.

Parameters

[in]	photon	The interacting photon
[in]	childEnergy	The energy of one child particle
[in]	childDirection	The direction of the child particle

Returns: Array containing the produced leptons

Definition at line 258 of file PhotonConversion.hpp.

View newest version in sPHENIX GitHub at line 258 of file PhotonConversion.hpp

References Acts::eElectron, Acts::eMom0, Acts::ePositron, ActsFatras::Particle::fourMomentum(), ActsFatras::Particle::fourPosition(), kElectronMass, ActsFatras::Barcode::makeDescendant(), ActsFatras::Particle::particleId(), ActsFatras::Particle::referenceSurface(), ActsFatras::Particle::setAbsoluteMomentum(), ActsFatras::Particle::setProcess(), and ActsFatras::Particle::setReferenceSurface().

Referenced by run().

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template<typename generator_t >

Particle::Scalar ActsFatras::PhotonConversion::generateFirstChildEnergyFraction	(	generator_t &	generator,
		Scalar	gammaMom
	)		const

private

Generate the energy fraction of the first child particle.

Template Parameters

generator_t Type of the random number generator

Parameters

[in,out]	generator	The random number generator
[in]	gammaMom	The momentum of the photon

Returns: The energy of the child particle

This method is based upon the Geant4 class G4PairProductionRelModel

Note: This method is from the Geant4 class G4Element

Definition at line 168 of file PhotonConversion.hpp.

View newest version in sPHENIX GitHub at line 168 of file PhotonConversion.hpp

References childEnergyScaleFactor, physmon_vertexing::delta, eps, kElectronMass, screenFunction1(), and screenFunction2().

Referenced by run().

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template<typename generator_t >

std::pair< Particle::Scalar, Particle::Scalar > ActsFatras::PhotonConversion::generatePathLimits	(	generator_t &	generator,
		const Particle &	particle
	)		const