ThePEG::Helicity::VVVVVertex Class Reference

This is the implementation of the four vector vertex. More...

#include <VVVVVertex.h>

Inheritance diagram for ThePEG::Helicity::VVVVVertex:

List of all members.

Public Member Functions

virtual void setCoupling (Energy2 q2, tcPDPtr part1, tcPDPtr part2, tcPDPtr part3, tcPDPtr part4)=0

Calculate the couplings.

Complex evaluate (Energy2 q2, int iopt, const VectorWaveFunction &vec1, const VectorWaveFunction &vec2, const VectorWaveFunction &vec3, const VectorWaveFunction &vec4)

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

Static Public Member Functions

static void Init ()

Standard Init function used to initialize the interfaces.

Protected Member Functions

void setOrder (int id1, int id2, int id3, int id4)

Set the order of the particles.

void setType (int itype)

Set the type of the vertex.

void setIntermediate (tcPDPtr part1, tcPDPtr part2, Complex c1, Complex c2)

Set the intermediate particles if including s/u/t channel terms.

Private Member Functions

VVVVVertex & operator= (const VVVVVertex &)

Private and non-existent assignment operator.

Private Attributes

int _itype

Type of vertex 1=QCD 2=EW.

int _iorder [4]

Order of the particles.

tcPDPtr _inter [2]

Intermediate particles.

Complex _coup [2]

Couplings of the intermediate particles.

Static Private Attributes

static
AbstractNoPIOClassDescription
< VVVVVertex > initVVVVVertex

Describe an abstract base class with persistent data.

Detailed Description

This is the implementation of the four vector vertex.

It is based on the AbstractVVVVVertex class for the storage of particles which are allowed to interact at the vertex. Classes implementation a specific vertex should inherit from this one and implement the virtual setCoupling member.

The form of the vertex is

$ic^2\left[ 2\epsilon_1\cdot\epsilon_2\epsilon_3\cdot\epsilon_4- \epsilon_1\cdot\epsilon_3\epsilon_2\cdot\epsilon_4- \epsilon_1\cdot\epsilon_4\epsilon_2\cdot\epsilon_3 \right]$

optional the additional diagrams from the three point vertices can be included.

See also:: AbstractVVVVVertex

Definition at line 39 of file VVVVVertex.h.

Member Function Documentation

Complex ThePEG::Helicity::VVVVVertex::evaluate	(	Energy2	q2,
		int	iopt,
		const VectorWaveFunction &	vec1,
		const VectorWaveFunction &	vec2,
		const VectorWaveFunction &	vec3,
		const VectorWaveFunction &	vec4
	)			`[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.
	iopt	Evaluation option, 0 just evaluate the four point vertex, 1 include all the three point diagrams as well.
	vec1	The wavefunction for the first vector.
	vec2	The wavefunction for the second vector.
	vec3	The wavefunction for the third vector.
	vec4	The wavefunction for the fourth vector.

Implements ThePEG::Helicity::AbstractVVVVVertex.

virtual void ThePEG::Helicity::VVVVVertex::setCoupling	(	Energy2	q2,
		tcPDPtr	part1,
		tcPDPtr	part2,
		tcPDPtr	part3,
		tcPDPtr	part4
	)			`[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.
	part4	The ParticleData pointer for the fourth particle.

void ThePEG::Helicity::VVVVVertex::setOrder	(	int	id1,
		int	id2,
		int	id3,
		int	id4
	)			`[inline, protected]`

Set the order of the particles.

Parameters:

	id1	The PDG code of the first particle.
	id2	The PDG code of the second particle.
	id3	The PDG code of the third particle.
	id4	The PDG code of the fourth particle.

Definition at line 91 of file VVVVVertex.h.

References _iorder.

void ThePEG::Helicity::VVVVVertex::setType ( int itype ) [inline, protected]

Set the type of the vertex.

Parameters:

itype

The type of vertex (QCD=1 or electroweak=2).

Definition at line 102 of file VVVVVertex.h.

References _itype.

void ThePEG::Helicity::VVVVVertex::setIntermediate	(	tcPDPtr	part1,
		tcPDPtr	part2,
		Complex	c1,
		Complex	c2
	)			`[inline, protected]`

Set the intermediate particles if including s/u/t channel terms.

Parameters:

	part1	The ParticleData pointer for the first particle.
	part2	The ParticleData pointer for the second particle.
	c1	The coupling for the first particle.
	c2	The coupling for the second particle.

Definition at line 113 of file VVVVVertex.h.

References _coup, and _inter.

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

VVVVVertex.h


Public Member Functions
virtual void	setCoupling (Energy2 q2, tcPDPtr part1, tcPDPtr part2, tcPDPtr part3, tcPDPtr part4)=0
	Calculate the couplings.

Complex	evaluate (Energy2 q2, int iopt, const VectorWaveFunction &vec1, const VectorWaveFunction &vec2, const VectorWaveFunction &vec3, const VectorWaveFunction &vec4)
	Members to calculate the helicity amplitude expressions for vertices and off-shell particles.
Static Public Member Functions
static void	Init ()
	Standard Init function used to initialize the interfaces.
Protected Member Functions
void	setOrder (int id1, int id2, int id3, int id4)
	Set the order of the particles.
void	setType (int itype)
	Set the type of the vertex.
void	setIntermediate (tcPDPtr part1, tcPDPtr part2, Complex c1, Complex c2)
	Set the intermediate particles if including s/u/t channel terms.
Private Member Functions
VVVVVertex &	operator= (const VVVVVertex &)
	Private and non-existent assignment operator.
Private Attributes
int	_itype
	Type of vertex 1=QCD 2=EW.
int	_iorder [4]
	Order of the particles.
tcPDPtr	_inter [2]
	Intermediate particles.
Complex	_coup [2]
	Couplings of the intermediate particles.
Static Private Attributes
static AbstractNoPIOClassDescription < VVVVVertex >	initVVVVVertex
	Describe an abstract base class with persistent data.