ThePEG::Helicity::SpinorBarWaveFunction Class Reference

#include <SpinorBarWaveFunction.h>

Inheritance diagram for ThePEG::Helicity::SpinorBarWaveFunction:

List of all members.

Public Member Functions
void	transform (const LorentzRotation &r)
	Perform the Lorentz transformation of the wave function.
Standard constructors and destructors.
	SpinorBarWaveFunction (const Lorentz5Momentum &p, tcPDPtr part, complex< double > s1, complex< double > s2, complex< double > s3, complex< double > s4)
	Constructor, set the momentum and the components of the spinor.
	SpinorBarWaveFunction (const Lorentz5Momentum &p, tcPDPtr part, const LorentzSpinorBar< double > &wave, Direction dir=intermediate)
	Constructor, set the momentum and the wavefunction.
	SpinorBarWaveFunction (const tPPtr &p, const LorentzSpinorBar< SqrtEnergy > &wave, Direction dir=intermediate)
	SpinorBarWaveFunction (const Lorentz5Momentum &p, tcPDPtr part, unsigned int ihel, Direction dir)
	Constructor, set the momentum, helicity, direction.
	SpinorBarWaveFunction (const Lorentz5Momentum &p, tcPDPtr part, Direction dir)
	Constructor, set the momentum, direction, zero the wavefunction.
	SpinorBarWaveFunction ()
	Default constructor.
	SpinorBarWaveFunction (vector< SpinorBarWaveFunction > &wave, tPPtr part, Direction dir, bool time, bool=true)
	Special for spin correlations.
complex< double >	operator() (int i) const
	Access to the wavefunction and its components.
const LorentzSpinorBar< double > &	wave () const
	Return wavefunction as LorentzSpinorBar<double>.
LorentzSpinorBar< SqrtEnergy >	dimensionedWave () const
	Return wavefunction as LorentzSpinorBar<SqrtEnergy>.
complex< double >	s1 () const
	Get the first spin component component.
complex< double >	s2 () const
	Get the second spin component component.
complex< double >	s3 () const
	Get the third spin component component.
complex< double >	s4 () const
	Get the fourth spin component component.
void	conjugate ()
	Take the conjugate of the spinor .
SpinorWaveFunction	bar ()
	Return the barred spinor.
void	reset (unsigned int ihel)
	Reset functions.
Static Public Member Functions
static void	calculateWaveFunctions (vector< LorentzSpinorBar< SqrtEnergy > > &waves, tPPtr particle, Direction)
	Calculate the wavefunctions.
static void	calculateWaveFunctions (vector< SpinorBarWaveFunction > &waves, tPPtr particle, Direction)
	Calculate the wavefunctions.
static void	calculateWaveFunctions (vector< LorentzSpinorBar< SqrtEnergy > > &waves, RhoDMatrix &rho, tPPtr particle, Direction)
	Calculate the wavefunctions.
static void	calculateWaveFunctions (vector< SpinorBarWaveFunction > &waves, RhoDMatrix &rho, tPPtr particle, Direction)
	Calculate the wavefunctions.
static void	constructSpinInfo (const vector< LorentzSpinorBar< SqrtEnergy > > &waves, tPPtr part, Direction dir, bool time)
	Construct the SpinInfo object.
static void	constructSpinInfo (const vector< SpinorBarWaveFunction > &waves, tPPtr part, Direction dir, bool time)
	Construct the SpinInfo object.
Private Member Functions
void	calculateWaveFunction (unsigned int ihel)
	Calcuate the wavefunction.
LorentzSpinorBar< SqrtEnergy >	dimensionedWf () const
	Return wavefunction as LorentzSpinorBar<SqrtEnergy>.
Private Attributes
LorentzSpinorBar< double >	_wf
	Storage of the Lorentz SpinorBar wavefunction.

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Detailed Description

Author:

Peter Richardson

The SpinorBarWaveFunction class is designed to store the wavefunction of a barred spinor in a form suitable for use in helicity amplitude calculations of the matrix element using a similar philosophy to the FORTRAN HELAS code.

In addition to storing the spinor using the LorentzSpinorBar class it inherits from the WaveFunctionBase class to provide storage of the momentum and ParticleData for the fermion.

This class also contains the code which does the actually calculation of the barred spinor for an external particle.

When calculating the wavefunction the direction of the particle is used,

i.e.

• incoming calculates a spinor.
• outgoing calculates a spinor.

N.B. In our convention 0 is the helicity state and 1 is the helicity state

See also:

WaveFunctionBase

LorentzSpinorBar

HelicityDefinitions

Definition at line 57 of file SpinorBarWaveFunction.h.

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Constructor & Destructor Documentation

ThePEG::Helicity::SpinorBarWaveFunction::SpinorBarWaveFunction	(	const Lorentz5Momentum &	p,
		tcPDPtr	part,
		complex< double >	s1,
		complex< double >	s2,
		complex< double >	s3,
		complex< double >	s4
	)			[inline]

Constructor, set the momentum and the components of the spinor.

Parameters:

	p	The momentum.
	part	The ParticleData pointer.
	s1	The first component
	s2	The second component
	s3	The third component
	s4	The fourth component

Definition at line 72 of file SpinorBarWaveFunction.h.

References ThePEG::Helicity::WaveFunctionBase::iSpin().

ThePEG::Helicity::SpinorBarWaveFunction::SpinorBarWaveFunction	(	const Lorentz5Momentum &	p,
		tcPDPtr	part,
		const LorentzSpinorBar< double > &	wave,
		Direction	dir = intermediate
	)			[inline]

Constructor, set the momentum and the wavefunction.

Parameters:

	p	The momentum.
	part	The ParticleData pointer.
	wave	The wavefunction.
	dir	The direction of the particle

Definition at line 88 of file SpinorBarWaveFunction.h.

References ThePEG::Helicity::WaveFunctionBase::iSpin().

ThePEG::Helicity::SpinorBarWaveFunction::SpinorBarWaveFunction	(	const Lorentz5Momentum &	p,
		tcPDPtr	part,
		unsigned int	ihel,
		Direction	dir
	)			[inline]

Constructor, set the momentum, helicity, direction.

Parameters:

	p	The momentum.
	part	The ParticleData pointer.
	ihel	The helicity (0,1 as described above.)
	dir	The direction.

Definition at line 114 of file SpinorBarWaveFunction.h.

References calculateWaveFunction(), and ThePEG::Helicity::WaveFunctionBase::iSpin().

ThePEG::Helicity::SpinorBarWaveFunction::SpinorBarWaveFunction	(	const Lorentz5Momentum &	p,
		tcPDPtr	part,
		Direction	dir
	)			[inline]

Constructor, set the momentum, direction, zero the wavefunction.

Parameters:

	p	The momentum.
	part	The ParticleData pointer.
	dir	The direction.

Definition at line 129 of file SpinorBarWaveFunction.h.

References ThePEG::Helicity::WaveFunctionBase::iSpin().

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Member Function Documentation

complex<double> ThePEG::Helicity::SpinorBarWaveFunction::operator()

(

int

i

)

const [inline]

Access to the wavefunction and its components.

Subscript operator for the wavefunction.

Definition at line 160 of file SpinorBarWaveFunction.h.

References _wf.

void ThePEG::Helicity::SpinorBarWaveFunction::conjugate

(

)

Take the conjugate of the spinor .

This operation transforms u-spinors to v-spinors and vice-versa and is required when dealing with majorana particles.

void ThePEG::Helicity::SpinorBarWaveFunction::reset

(

unsigned int

ihel

)

[inline]

Reset functions.

Reset the helicity (calculates the new spinor).

Parameters:

ihel

The helicity (0,1 as described above.)

Definition at line 215 of file SpinorBarWaveFunction.h.

References calculateWaveFunction().

void ThePEG::Helicity::SpinorBarWaveFunction::calculateWaveFunction

(

unsigned int

ihel

)

[private]

Calcuate the wavefunction.

Parameters:

ihel

The helicity (0,1 as described above.)

Referenced by reset(), and SpinorBarWaveFunction().

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

• SpinorBarWaveFunction.h