ThePEG::Helicity::FFTVertex Class Reference

The FFTVertex class is the implementation of the fermion-fermion-tensor vertex. More...

#include <FFTVertex.h>

Inheritance diagram for ThePEG::Helicity::FFTVertex:

ThePEG::Helicity::AbstractFFTVertex ThePEG::Helicity::VertexBase ThePEG::Interfaced ThePEG::InterfacedBase ThePEG::Base ThePEG::Named ThePEG::Pointer::ReferenceCounted

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 TensorWaveFunction &ten3)
 Members to calculate the helicity amplitude expressions for vertices and off-shell particles.
TensorWaveFunction evaluate (Energy2 q2, int iopt, tcPDPtr out, const SpinorWaveFunction &sp1, const SpinorBarWaveFunction &sbar2, Energy mass=-GeV, Energy width=-GeV)
 Evaluate the off-shell tensor coming from the vertex.
SpinorWaveFunction evaluate (Energy2 q2, int iopt, tcPDPtr out, const SpinorWaveFunction &sp1, const TensorWaveFunction &ten3, 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 TensorWaveFunction &ten3, Energy mass=-GeV, Energy width=-GeV)
 Evaluate the off-shell barred spinor coming from the vertex.

Static Public Member Functions

static void Init ()
 Standard Init function used to initialize the interfaces.

Private Member Functions

FFTVertex & operator= (const FFTVertex &)
 Private and non-existent assignment operator.

Static Private Attributes

static
AbstractNoPIOClassDescription
< FFTVertex > 		initFFTVertex
 Describe an abstract class with persistent data.

Detailed Description

The FFTVertex class is the implementation of the fermion-fermion-tensor vertex.

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

All implementations of this vertex should inherit from it and implement the virtual setCoupling member.

The vertex has the form

\[-\frac{i\kappa}8\bar{f_2}\left[ \gamma_\mu(k_1-k_2)_\nu+\gamma_\nu(k_1-k_2)_\mu -2g_{\mu\nu}(k\!\!\!\!\!\not\,\,\,_1-k\!\!\!\!\!\not\,\,\,_2)+4g_{\mu\nu}m_{f} \right]f_1\epsilon^{\mu\nu}_3\]

See also:
AbstractFFTVertex

Definition at line 40 of file FFTVertex.h.

Member Function Documentation

Complex ThePEG::Helicity::FFTVertex::evaluate ( Energy2  q2,
const SpinorWaveFunction &  sp1,
const SpinorBarWaveFunction &  sbar2,
const TensorWaveFunction &  ten3 
) [virtual]

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

Evalulate the vertex.

Parameters:
q2 The scale $q^2$ for the coupling at the vertex.
sp1 The wavefunction for the ferimon.
sbar2 The wavefunction for the antifermion.
ten3 The wavefunction for the tensor.

Implements ThePEG::Helicity::AbstractFFTVertex.

TensorWaveFunction ThePEG::Helicity::FFTVertex::evaluate ( Energy2  q2,
int  iopt,
tcPDPtr  out,
const SpinorWaveFunction &  sp1,
const SpinorBarWaveFunction &  sbar2,
Energy  mass = -GeV,
Energy  width = -GeV 
) [virtual]

Evaluate the off-shell tensor coming from the vertex.

Parameters:
q2 The scale $q^2$ for the coupling at the vertex.
iopt Option of the shape of the Breit-Wigner for the off-shell tensor.
out The ParticleData pointer for the off-shell tensor.
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::AbstractFFTVertex.

SpinorWaveFunction ThePEG::Helicity::FFTVertex::evaluate ( Energy2  q2,
int  iopt,
tcPDPtr  out,
const SpinorWaveFunction &  sp1,
const TensorWaveFunction &  ten3,
Energy  mass = -GeV,
Energy  width = -GeV 
) [virtual]

Evaluate the off-shell spinor coming from the vertex.

Parameters:
q2 The scale $q^2$ 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.
ten3 The wavefunction for the tensor.
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::AbstractFFTVertex.

SpinorBarWaveFunction ThePEG::Helicity::FFTVertex::evaluate ( Energy2  q2,
int  iopt,
tcPDPtr  out,
const SpinorBarWaveFunction &  sbar2,
const TensorWaveFunction &  ten3,
Energy  mass = -GeV,
Energy  width = -GeV 
) [virtual]

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

Parameters:
q2 The scale $q^2$ 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.
ten3 The wavefunction for the tensor.
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::AbstractFFTVertex.

virtual void ThePEG::Helicity::FFTVertex::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 $q^2$ 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:
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