ThePEG::Helicity::VSSVertex Class Reference

The VSSVertex class is the implementation of the vector-scalar-scalar vertex. More...

#include <VSSVertex.h>

Inheritance diagram for ThePEG::Helicity::VSSVertex:

List of all members.

Public Member Functions
virtual void	setCoupling (Energy2 q2, tcPDPtr part1, tcPDPtr part2, tcPDPtr part3)=0
	Calculate the couplings.
Complex	evaluate (Energy2 q2, const VectorWaveFunction &vec1, const ScalarWaveFunction &sca2, const ScalarWaveFunction &sca3)
	Members to calculate the helicity amplitude expressions for vertices and off-shell particles.
VectorWaveFunction	evaluate (Energy2 q2, int iopt, tcPDPtr out, const ScalarWaveFunction &sca2, const ScalarWaveFunction &sca3, Energy mass=-GeV, Energy width=-GeV)
	Evaluate the off-shell vector coming from the vertex.
ScalarWaveFunction	evaluate (Energy2 q2, int iopt, tcPDPtr out, const VectorWaveFunction &vec1, const ScalarWaveFunction &sca2, Energy mass=-GeV, Energy width=-GeV)
	Evaluate the off-shell scalar coming from the vertex.
Static Public Member Functions
static void	Init ()
	Standard Init function used to initialize the interfaces.
Private Member Functions
VSSVertex &	operator= (const VSSVertex &)
	Private and non-existent assignment operator.
Static Private Attributes
static AbstractNoPIOClassDescription < VSSVertex >	initVSSVertex
	Describe an abstract class with persistent data.

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Detailed Description

The VSSVertex class is the implementation of the vector-scalar-scalar vertex.

It inherits from the AbstractVSSVertex class for storage of the particles and implements the helicity calculations.

All such vertices should inherit from this class and implement the virtual setCoupling member

The form of the vertex is

See also:

AbstractVSSVertex

Definition at line 36 of file VSSVertex.h.

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Member Function Documentation

Complex ThePEG::Helicity::VSSVertex::evaluate	(	Energy2	q2,
		const VectorWaveFunction &	vec1,
		const ScalarWaveFunction &	sca2,
		const ScalarWaveFunction &	sca3
	)			[virtual]

Members to calculate the helicity amplitude expressions for vertices and off-shell particles.

Evaluate the vertex.

Parameters:

	q2	The scale for the coupling at the vertex.
	vec1	The wavefunction for the vector.
	sca2	The wavefunction for the first scalar.
	sca3	The wavefunction for the second scalar.

Implements ThePEG::Helicity::AbstractVSSVertex.

VectorWaveFunction ThePEG::Helicity::VSSVertex::evaluate	(	Energy2	q2,
		int	iopt,
		tcPDPtr	out,
		const ScalarWaveFunction &	sca2,
		const ScalarWaveFunction &	sca3,
		Energy	mass = -GeV,
		Energy	width = -GeV
	)			[virtual]

Evaluate the off-shell vector coming from the vertex.

Parameters:

	q2	The scale for the coupling at the vertex.
	iopt	Option of the shape of the Breit-Wigner for the off-shell vector.
	out	The ParticleData pointer for the off-shell vector.
	sca2	The wavefunction for the first scalar.
	sca3	The wavefunction for the second scalar.
	mass	The mass of the off-shell particle if not taken from the ParticleData object
	width	The width of the off-shell particle if not taken from the ParticleData object

Implements ThePEG::Helicity::AbstractVSSVertex.

ScalarWaveFunction ThePEG::Helicity::VSSVertex::evaluate	(	Energy2	q2,
		int	iopt,
		tcPDPtr	out,
		const VectorWaveFunction &	vec1,
		const ScalarWaveFunction &	sca2,
		Energy	mass = -GeV,
		Energy	width = -GeV
	)			[virtual]

Evaluate the off-shell scalar coming from the vertex.

Parameters:

	q2	The scale for the coupling at the vertex.
	iopt	Option of the shape of the Breit-Wigner for the off-shell scalar.
	out	The ParticleData pointer for the off-shell scalar.
	vec1	The wavefunction for the vector.
	sca2	The wavefunction for the scalar.
	mass	The mass of the off-shell particle if not taken from the ParticleData object
	width	The width of the off-shell particle if not taken from the ParticleData object

Implements ThePEG::Helicity::AbstractVSSVertex.

virtual void ThePEG::Helicity::VSSVertex::setCoupling	(	Energy2	q2,
		tcPDPtr	part1,
		tcPDPtr	part2,
		tcPDPtr	part3
	)			[pure virtual]

Calculate the couplings.

This method is virtual and must be implemented in classes inheriting from this.

Parameters:

	q2	The scale for the coupling at the vertex.
	part1	The ParticleData pointer for the first particle.
	part2	The ParticleData pointer for the second particle.
	part3	The ParticleData pointer for the third particle.

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

• VSSVertex.h