ThePEG::RunningCoupling Class Reference

RunningCoupling an abstract base class unifying the treatment of running couplings in ThePEG. More...

#include <RunningCoupling.h>

Inheritance diagram for ThePEG::RunningCoupling:

List of all members.

Public Member Functions
	RunningCoupling ()
	The default constructor.
double	value (Energy2 scale) const
	Return the value of the coupling at a given scale using the StandardModelBase object used by the EventGenerator.
virtual double	overestimateValue (Energy2 scale) const
	Return an overestimate to the running coupling at the given scale.
virtual double	ratioToOverestimate (Energy2) const
	Return the ratio of the exact to the overestimated value of the running coupling.
double	scaleFactor () const
	Return the scale factor, which may be used to globally rescale the argument of the running coupling.
Methods to be implemented by a derived class
virtual double	value (Energy2 scale, const StandardModelBase &sm) const =0
	Return the value of the coupling at a given scale using the given standard model object, sm.
virtual unsigned int	nloops () const
	Return the number of loops contributing to the running this coupling.
Functions used by the persistent I/O system.
void	persistentOutput (PersistentOStream &os) const
	Function used to write out object persistently.
void	persistentInput (PersistentIStream &is, int version)
	Function used to read in object persistently.
Static Public Member Functions
static void	Init ()
	Standard Init function used to initialize the interface.
Private Member Functions
RunningCoupling &	operator= (const RunningCoupling &)
	Private and non-existent assignment operator.
Private Attributes
double	theScaleFactor
	The scale factor used to rescale the argument of the running coupling.
Static Private Attributes
static AbstractClassDescription < RunningCoupling >	initRunningCoupling
	Describe an abstract class without persistent data.

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Detailed Description

RunningCoupling an abstract base class unifying the treatment of running couplings in ThePEG.

See also:

The interfaces defined for RunningCoupling.

StandardModelBase

Definition at line 27 of file RunningCoupling.h.

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Member Function Documentation

virtual unsigned int ThePEG::RunningCoupling::nloops

(

)

const [inline, virtual]

Return the number of loops contributing to the running this coupling.

The default returns zero to ensure backward compatibility.

Reimplemented in ThePEG::O1AlphaS, and ThePEG::SimpleAlphaEM.

Definition at line 50 of file RunningCoupling.h.

virtual double ThePEG::RunningCoupling::overestimateValue

(

Energy2

scale

)

const [inline, virtual]

Return an overestimate to the running coupling at the given scale.

This is defined to aid veto algorithms and by default returns the coupling itself, using the EventGenerators's StandardModelBase object.

Definition at line 68 of file RunningCoupling.h.

References value().

virtual double ThePEG::RunningCoupling::ratioToOverestimate

(

Energy2

)

const [inline, virtual]

Return the ratio of the exact to the overestimated value of the running coupling.

The default implementation returns one in accordance with the default implementation of overestimateValue

Definition at line 78 of file RunningCoupling.h.

void ThePEG::RunningCoupling::persistentOutput

(

PersistentOStream &

os

)

const

Function used to write out object persistently.

Parameters:

os

the persistent output stream written to.

Reimplemented from ThePEG::Interfaced.

Reimplemented in ThePEG::AlphaSBase, and ThePEG::O1AlphaS.

void ThePEG::RunningCoupling::persistentInput	(	PersistentIStream &	is,
		int	version
	)

Function used to read in object persistently.

Parameters:

	is	the persistent input stream read from.
	version	the version number of the object when written.

Reimplemented from ThePEG::Interfaced.

Reimplemented in ThePEG::AlphaSBase, and ThePEG::O1AlphaS.

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

• RunningCoupling.h