ThePEG::Helicity::VVVVertex Class Reference

The VVVVertex class is the base class for triple vector vertices using the perturbative form. More...

#include <VVVVertex.h>

Inheritance diagram for ThePEG::Helicity::VVVVertex:

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 VectorWaveFunction &vec2, const VectorWaveFunction &vec3)

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

VectorWaveFunction evaluate (Energy2 q2, int iopt, tcPDPtr out, const VectorWaveFunction &vec2, const VectorWaveFunction &vec3, Energy mass=-GeV, Energy width=-GeV)

Evaluate the off-shell vector coming from the vertex.

Static Public Member Functions

static void Init ()

Standard Init function used to initialize the interfaces.

Private Member Functions

VVVVertex & operator= (const VVVVertex &)

Private and non-existent assignment operator.

Static Private Attributes

static
AbstractNoPIOClassDescription
< VVVVertex > initVVVVertex

Describe an abstract base class with no persistent data.

Detailed Description

The VVVVertex class is the base class for triple vector vertices using the perturbative form.

It inherits from the AbstractVVVVertex class for the storage of the particles allowed at the vertex.

Classes which implement a specific vertex should inherit from this and implement the virtual setCoupling member.

The form of the vertex is

$ig\left[ (p_1-p_2)^\gamma g^{\alpha\beta } +(p_2-p_3)^\alpha g^{\beta \gamma} +(p_3-p_1)^\beta g^{\alpha\gamma} \right]\epsilon_{1\alpha}\epsilon_{2\beta}\epsilon_{3\gamma}$

See also:: AbstractVVVVertex

Definition at line 39 of file VVVVertex.h.

Member Function Documentation

Complex ThePEG::Helicity::VVVVertex::evaluate	(	Energy2	q2,
		const VectorWaveFunction &	vec1,
		const VectorWaveFunction &	vec2,
		const VectorWaveFunction &	vec3
	)			`[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 first vector.
	vec2	The wavefunction for the second vector.
	vec3	The wavefunction for the third vector.

Implements ThePEG::Helicity::AbstractVVVVertex.

VectorWaveFunction ThePEG::Helicity::VVVVertex::evaluate	(	Energy2	q2,
		int	iopt,
		tcPDPtr	out,
		const VectorWaveFunction &	vec2,
		const VectorWaveFunction &	vec3,
		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.
	vec2	The wavefunction for the second vector.
	vec3	The wavefunction for the third vector.
	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::AbstractVVVVertex.

virtual void ThePEG::Helicity::VVVVertex::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.

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

VVVVertex.h


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 VectorWaveFunction &vec2, const VectorWaveFunction &vec3)
	Members to calculate the helicity amplitude expressions for vertices and off-shell particles.
VectorWaveFunction	evaluate (Energy2 q2, int iopt, tcPDPtr out, const VectorWaveFunction &vec2, const VectorWaveFunction &vec3, Energy mass=-GeV, Energy width=-GeV)
	Evaluate the off-shell vector coming from the vertex.
Static Public Member Functions
static void	Init ()
	Standard Init function used to initialize the interfaces.
Private Member Functions
VVVVertex &	operator= (const VVVVertex &)
	Private and non-existent assignment operator.
Static Private Attributes
static AbstractNoPIOClassDescription < VVVVertex >	initVVVVertex
	Describe an abstract base class with no persistent data.