ThePEG::Helicity::HelicityVertex Class Reference

The HelicityVertex class is designed to store the helicity amplitude expression for the matrix element for use by the spin correlation algorithm. More...

#include <HelicityVertex.h>

Inheritance diagram for ThePEG::Helicity::HelicityVertex:

List of all members.

Public Types
typedef vector< tcSpinPtr >	SpinVector
	A vector of SpinInfo objects.
Public Member Functions
virtual void	rebind (const EventTranslationMap &trans)
	Rebind to cloned objects.
Access the incoming and outgoing particles.
const SpinVector &	incoming () const
	Access the spin of the incoming particles.
const SpinVector &	outgoing () const
	Access the spin of the outgoing particles.
void	addIncoming (tcSpinPtr spin, int &loc)
	Add the spin of an incoming particle.
void	addOutgoing (tcSpinPtr spin, int &loc)
	Add the spin of an outgoing particle.
void	resetIncoming (tcSpinPtr spin, int loc)
	Reset the spin of the incoming particle at position loc.
void	resetOutgoing (tcSpinPtr spin, int loc)
	Reset the spin of the outgoing particle at position loc.
Mthods to calculate rho and D matrices.
virtual RhoDMatrix	getRhoMatrix (int loc, bool recursive) const =0
	Get the rho matrix for the outgoing particle at position loc.
virtual RhoDMatrix	getDMatrix (int loc) const =0
	Get the D matrix for the incoming particle at position loc.
Static Public Member Functions
static void	Init ()
	Standard Init function.
Private Member Functions
HelicityVertex &	operator= (const HelicityVertex &)
	Private and non-existent assignment operator.
Private Attributes
SpinVector	_incoming
	Pointers to the incoming particle spins at the vertex.
SpinVector	_outgoing
	Pointers to the outgoing particle spins at the vertex.
Static Private Attributes
static AbstractNoPIOClassDescription < HelicityVertex >	initHelicityVertex
	Describe an abstract base class without persistent data.
Friends
ostream &	operator<< (ostream &os, const HelicityVertex &vert)
	Output the spin density matrix for debugging purposes.

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Detailed Description

The HelicityVertex class is designed to store the helicity amplitude expression for the matrix element for use by the spin correlation algorithm.

It implements the storage of the pointers to the incoming and outgoing particles at the vertex and virtual methods for calculating the rho and D matrices. The concrete implementations of the vertices for specific processes, eg production or decay, inherit from this and implement the storage of the matrix element together with the set and get methods.

These methods are then called by the SpinInfo class to perform the calculations.

See also:

SpinInfo

Author:

Peter Richardson

Definition at line 46 of file HelicityVertex.h.

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Member Typedef Documentation

typedef vector<tcSpinPtr> ThePEG::Helicity::HelicityVertex::SpinVector

A vector of SpinInfo objects.

Definition at line 58 of file HelicityVertex.h.

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Member Function Documentation

virtual void ThePEG::Helicity::HelicityVertex::rebind

(

const EventTranslationMap &

trans

)

[virtual]

Rebind to cloned objects.

If a HelicityVertex is cloned together with a whole Event and this has pointers to other event record objects, these should be rebound to their clones in this function.

Reimplemented from ThePEG::EventInfoBase.

void ThePEG::Helicity::HelicityVertex::addIncoming	(	tcSpinPtr	spin,
		int &	loc
	)			[inline]

Add the spin of an incoming particle.

Parameters:

	spin	the spin of the particle.
	loc	is set to the position in the list of incoming spins.

Definition at line 94 of file HelicityVertex.h.

References _incoming.

void ThePEG::Helicity::HelicityVertex::addOutgoing	(	tcSpinPtr	spin,
		int &	loc
	)			[inline]

Add the spin of an outgoing particle.

Parameters:

	spin	the spin of the particle.
	loc	is set to the position in the list of outgoing spins.

Definition at line 104 of file HelicityVertex.h.

References _outgoing.

virtual RhoDMatrix ThePEG::Helicity::HelicityVertex::getRhoMatrix	(	int	loc,
		bool	recursive
	)			const [pure virtual]

Get the rho matrix for the outgoing particle at position loc.

Parameters:

recursive

Recursively calculate up the tree

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

• HelicityVertex.h