ThePEG::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::HelicityVertex:

Public Types
typedef vector< tcSpinPtr >	SpinVector
	A vector of SpinInfo objects. More...
Public Types inherited from ThePEG::Pointer::ReferenceCounted
typedef unsigned int	CounterType
	The integer type used for counting.

Public Member Functions
virtual void	rebind (const EventTranslationMap &trans)
	Rebind to cloned objects. More...
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. More...
void	addOutgoing (tcSpinPtr spin, int &loc)
	Add the spin of an outgoing particle. More...
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.
Public Member Functions inherited from ThePEG::EventInfoBase
virtual EIPtr	clone () const
	Standard clone method.
Public Member Functions inherited from ThePEG::Base
virtual	~Base ()
	The virtual destructor.
void	debug () const
	Print out debugging information for this object on std::cerr. More...
virtual void	debugme () const
	Print out debugging information for this object on std::cerr. More...
Public Member Functions inherited from ThePEG::Pointer::ReferenceCounted
CounterType	referenceCount () const
	Return the reference count.

Static Public Member Functions
static void	Init ()
	Standard Init function.
Static Public Member Functions inherited from ThePEG::EventInfoBase
static void	Init ()
	Standard Init function. More...
Static Public Member Functions inherited from ThePEG::Base
static void	Init ()
	The standard Init function used to initialize the interfaces. More...

Private Member Functions
HelicityVertex &	operator= (const HelicityVertex &)=delete
	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.

Additional Inherited Members
Public Attributes inherited from ThePEG::Pointer::ReferenceCounted
const unsigned long	uniqueId
	The unique ID. More...
Protected Member Functions inherited from ThePEG::Pointer::ReferenceCounted
	ReferenceCounted ()
	Default constructor.
	ReferenceCounted (const ReferenceCounted &)
	Copy-constructor.
ReferenceCounted &	operator= (const ReferenceCounted &)
	Assignment.

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 41 of file HelicityVertex.h.

Member Typedef Documentation

SpinVector

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

A vector of SpinInfo objects.

Definition at line 53 of file HelicityVertex.h.

Member Function Documentation

addIncoming()

void ThePEG::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 89 of file HelicityVertex.h.

References _incoming.

addOutgoing()

void ThePEG::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.

rebind()

virtual void ThePEG::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.

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

• HelicityVertex.h