ThePEG::Helicity::FFSVertex Class Reference

The FFSVertex class is the implementation of the interact of a scalar boson and a fermion-antifermion pair. More...

#include <FFSVertex.h>

Inheritance diagram for ThePEG::Helicity::FFSVertex:

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 SpinorWaveFunction &sp1, const SpinorBarWaveFunction &sbar2, const ScalarWaveFunction &sca3)

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

SpinorWaveFunction evaluate (Energy2 q2, int iopt, tcPDPtr out, const SpinorWaveFunction &sp1, const ScalarWaveFunction &sca3, Energy mass=-GeV, Energy width=-GeV)

Evaluate the off-shell spinor coming from the vertex.

SpinorBarWaveFunction evaluate (Energy2 q2, int iopt, tcPDPtr out, const SpinorBarWaveFunction &sbar2, const ScalarWaveFunction &sca3, Energy mass=-GeV, Energy width=-GeV)

Evaluate the off-shell barred spinor coming from the vertex.

ScalarWaveFunction evaluate (Energy2 q2, int iopt, tcPDPtr out, const SpinorWaveFunction &sp1, const SpinorBarWaveFunction &sbar2, Energy mass=-GeV, Energy width=-GeV)

Evaluate the off-shell scalar coming from the vertex.

Complex left ()

Get the couplings.

Complex right ()

Get the right coupling.

Static Public Member Functions

static void Init ()

Standard Init function used to initialize the interfaces.

Protected Member Functions

void left (Complex in)

Set the couplings.

void right (Complex in)

Set the right coupling.

Private Member Functions

FFSVertex & operator= (const FFSVertex &)

Private and non-existent assignment operator.

Private Attributes

Complex _left

Storage of the left coupling.

Complex _right

Storage of the right coupling.

Static Private Attributes

static
AbstractNoPIOClassDescription
< FFSVertex > initFFSVertex

Describe an abstract base class with persistent data.

Detailed Description

The FFSVertex class is the implementation of the interact of a scalar boson and a fermion-antifermion pair.

It inherits from the AbstractFFSVertex class for storage of the particles interacting at the vertex and implements the helicity calculations.

Implementations of specific interactions should inherit from this and implement the virtual setCoupling member.

The form of the vertex is

$ic\bar{f_2}a^\lambda P_\lambda f_1\phi_3$

where $a^\pm$ are the right and left couplings and $P_\pm=(1\pm\gamma_5)$ are the chirality projection operators.

See also:: AbstractFFSVertex

Definition at line 41 of file FFSVertex.h.

Member Function Documentation

Complex ThePEG::Helicity::FFSVertex::evaluate	(	Energy2	q2,
		const SpinorWaveFunction &	sp1,
		const SpinorBarWaveFunction &	sbar2,
		const ScalarWaveFunction &	sca3
	)			`[virtual]`

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

Evalulate the vertex.

Parameters:

	q2	The scale for the coupling at the vertex.
	sp1	The wavefunction for the ferimon.
	sbar2	The wavefunction for the antifermion.
	sca3	The wavefunction for the scalar.

Implements ThePEG::Helicity::AbstractFFSVertex.

SpinorWaveFunction ThePEG::Helicity::FFSVertex::evaluate	(	Energy2	q2,
		int	iopt,
		tcPDPtr	out,
		const SpinorWaveFunction &	sp1,
		const ScalarWaveFunction &	sca3,
		Energy	mass = `-GeV`,
		Energy	width = `-GeV`
	)			`[virtual]`

Evaluate the off-shell spinor 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 spinor.
	out	The ParticleData pointer for the off-shell spinor.
	sp1	The wavefunction for the ferimon.
	sca3	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::AbstractFFSVertex.

SpinorBarWaveFunction ThePEG::Helicity::FFSVertex::evaluate	(	Energy2	q2,
		int	iopt,
		tcPDPtr	out,
		const SpinorBarWaveFunction &	sbar2,
		const ScalarWaveFunction &	sca3,
		Energy	mass = `-GeV`,
		Energy	width = `-GeV`
	)			`[virtual]`

Evaluate the off-shell barred spinor 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 barred spinor.
	out	The ParticleData pointer for the off-shell barred spinor.
	sbar2	The wavefunction for the antifermion.
	sca3	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::AbstractFFSVertex.

ScalarWaveFunction ThePEG::Helicity::FFSVertex::evaluate	(	Energy2	q2,
		int	iopt,
		tcPDPtr	out,
		const SpinorWaveFunction &	sp1,
		const SpinorBarWaveFunction &	sbar2,
		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.
	sp1	The wavefunction for the ferimon.
	sbar2	The wavefunction for the antifermion.
	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::AbstractFFSVertex.

virtual void ThePEG::Helicity::FFSVertex::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.
	ioff	An integer referring to which particle in the list is offshell if applicable.

Complex ThePEG::Helicity::FFSVertex::left ( ) [inline]

Get the couplings.

Get the left coupling.

Definition at line 140 of file FFSVertex.h.

References _left.

void ThePEG::Helicity::FFSVertex::left ( Complex in ) [inline, protected]

Set the couplings.

Set the left coupling.

Definition at line 157 of file FFSVertex.h.

References _left.

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

FFSVertex.h


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

Complex	evaluate (Energy2 q2, const SpinorWaveFunction &sp1, const SpinorBarWaveFunction &sbar2, const ScalarWaveFunction &sca3)
	Members to calculate the helicity amplitude expressions for vertices and off-shell particles.
SpinorWaveFunction	evaluate (Energy2 q2, int iopt, tcPDPtr out, const SpinorWaveFunction &sp1, const ScalarWaveFunction &sca3, Energy mass=-GeV, Energy width=-GeV)
	Evaluate the off-shell spinor coming from the vertex.
SpinorBarWaveFunction	evaluate (Energy2 q2, int iopt, tcPDPtr out, const SpinorBarWaveFunction &sbar2, const ScalarWaveFunction &sca3, Energy mass=-GeV, Energy width=-GeV)
	Evaluate the off-shell barred spinor coming from the vertex.
ScalarWaveFunction	evaluate (Energy2 q2, int iopt, tcPDPtr out, const SpinorWaveFunction &sp1, const SpinorBarWaveFunction &sbar2, Energy mass=-GeV, Energy width=-GeV)
	Evaluate the off-shell scalar coming from the vertex.

Complex	left ()
	Get the couplings.
Complex	right ()
	Get the right coupling.
Static Public Member Functions
static void	Init ()
	Standard Init function used to initialize the interfaces.
Protected Member Functions

void	left (Complex in)
	Set the couplings.
void	right (Complex in)
	Set the right coupling.
Private Member Functions
FFSVertex &	operator= (const FFSVertex &)
	Private and non-existent assignment operator.
Private Attributes
Complex	_left
	Storage of the left coupling.
Complex	_right
	Storage of the right coupling.
Static Private Attributes
static AbstractNoPIOClassDescription < FFSVertex >	initFFSVertex
	Describe an abstract base class with persistent data.