ThePEG::Helicity::TensorSpinInfo Class Reference

The TensorSpinInfo class is the implementation of the spin information for tensor particles. More...

#include <TensorSpinInfo.h>

Inheritance diagram for ThePEG::Helicity::TensorSpinInfo:

List of all members.

Public Member Functions
virtual void	transform (const LorentzMomentum &, const LorentzRotation &)
	Perform a lorentz rotation of the spin information.
virtual EIPtr	clone () const
	Standard clone method.
Standard constructors and destructors.
	TensorSpinInfo ()
	Default constructor.
	TensorSpinInfo (const Lorentz5Momentum &p, bool time)
	Standard Constructor.
Access the basis states.
void	setBasisState (unsigned int hel, LorentzTensor< double > in) const
	Set the basis state, this is production state.
void	setDecayState (unsigned int hel, LorentzTensor< double > in) const
	Set the basis state for the decay.
const LorentzTensor< double > &	getProductionBasisState (unsigned int hel) const
	Get the basis state for the production for the given helicity, hel (0,1,2,3,4 as described above.
const LorentzTensor< double > &	getDecayBasisState (unsigned int hel) const
	Get the basis state for the decay for the given helicity, hel (0,1,2,3,4 as described above.
Static Public Member Functions
static void	Init ()
	Standard Init function.
Private Member Functions
TensorSpinInfo &	operator= (const TensorSpinInfo &)
	Private and non-existent assignment operator.
Private Attributes
vector< LorentzTensor< double > >	_productionstates
	Basis states in the frame in which the particle was produced.
vector< LorentzTensor< double > >	_decaystates
	Basis states in the frame in which the particle decays.
vector< LorentzTensor< double > >	_currentstates
	Basis states in the current frame of the particle.
bool	_decaycalc
	True if the decay state has been set.
Static Private Attributes
static NoPIOClassDescription < TensorSpinInfo >	initTensorSpinInfo
	Describe a concrete class without persistent data.

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Detailed Description

The TensorSpinInfo class is the implementation of the spin information for tensor particles.

It inherits from the SpinInfo class and implements the storage of the basis tensors.

These basis states should be set by either matrix elements or decayers which are capable of generating spin correlation information.

The basis states in the rest frame of the particles can then be accessed by decayers to produce the correct correlation.

N.B. in our convention 0 is the helicity state, 1 is the helicity state, 2 is the helicity state, 3 is the helicity state and 4 is the helicity state.

Author:

Peter Richardson

Definition at line 42 of file TensorSpinInfo.h.

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Constructor & Destructor Documentation

ThePEG::Helicity::TensorSpinInfo::TensorSpinInfo	(	const Lorentz5Momentum &	p,
		bool	time
	)			[inline]

Standard Constructor.

Parameters:

	p	the production momentum.
	time	true if the particle is time-like.

Definition at line 60 of file TensorSpinInfo.h.

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Member Function Documentation

void ThePEG::Helicity::TensorSpinInfo::setBasisState	(	unsigned int	hel,
		LorentzTensor< double >	in
	)			const [inline]

Set the basis state, this is production state.

Parameters:

	hel	the helicity (0,1,2,3,4 as described above.)
	in	the LorentzTensor for the given helicity.

Definition at line 75 of file TensorSpinInfo.h.

References _currentstates, and _productionstates.

void ThePEG::Helicity::TensorSpinInfo::setDecayState	(	unsigned int	hel,
		LorentzTensor< double >	in
	)			const [inline]

Set the basis state for the decay.

Parameters:

	hel	the helicity (0,1,2,3,4 as described above.)
	in	the LorentzTensor for the given helicity.

Definition at line 86 of file TensorSpinInfo.h.

References _decaycalc, and _decaystates.

const LorentzTensor<double>& ThePEG::Helicity::TensorSpinInfo::getProductionBasisState

(

unsigned int

hel

)

const [inline]

Get the basis state for the production for the given helicity, hel (0,1,2,3,4 as described above.

)

Definition at line 96 of file TensorSpinInfo.h.

References _productionstates.

const LorentzTensor<double>& ThePEG::Helicity::TensorSpinInfo::getDecayBasisState

(

unsigned int

hel

)

const [inline]

Get the basis state for the decay for the given helicity, hel (0,1,2,3,4 as described above.

)

Definition at line 105 of file TensorSpinInfo.h.

References _currentstates, _decaycalc, and _decaystates.

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

• TensorSpinInfo.h