O1AlphaS inherits from AlphaSBase and implements the leading order running QCD coupling. More...

#include <O1AlphaS.h>

Inheritance diagram for ThePEG::O1AlphaS:

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Public Member Functions
Standard constructors and destructors.
	O1AlphaS ()
	Default constructor.

Virtual functions mandated by the sub-class.
virtual double	value (Energy2 scale, const StandardModelBase &) const
	The \(\alpha_S\).

virtual unsigned int	nloops () const
	Return the number of loops contributing to the running this coupling.

virtual vector< Energy2 >	flavourThresholds () const
	Return the flavour thresholds used.

virtual vector< Energy >	LambdaQCDs () const
	Return the \(\Lambda_{QCD}\) used for different numbers of active flavours.

int	getMaxFlav () const
	Return the maximum number of active flavours.

Public Member Functions inherited from ThePEG::AlphaSBase
unsigned int	Nf (Energy2 scale) const
	Return the number of avtive quark flavours.

Energy	LambdaQCD (unsigned int nflav) const
	Return the \(\Lambda_{QCD}\) used for nflav active flavours.

Energy	LambdaQCD (Energy2 scale) const
	Return the \(\Lambda_{QCD}\) used for corresponding given scale.

const vector< Energy > &	quarkMasses () const
	Return the quark masses to be used; if not empty these masses should be considered instead of the ones set in the particle data objects.

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.

Public Member Functions inherited from ThePEG::RunningCoupling
	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.

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.

Public Member Functions inherited from ThePEG::Interfaced
virtual	~Interfaced ()
	Empty virtual destructor.

virtual bool	defaultInit ()
	Functions which are to be used during the actual event generation, after the setup is complete.

PPtr	getParticle (PID) const
	Create a new Particle instance given a id number.

PDPtr	getParticleData (PID) const
	Return a pointer to the ParticleData object corresponding to the given id number.

bool	used () const
	Returns true if this object has actally been used.

void	useMe () const
	Should be called to indicate that this object has actually been used.

tEGPtr	generator () const
	Return a pointer to the EventGenerator controlling the run.

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.

Public Member Functions inherited from ThePEG::InterfacedBase
virtual	~InterfacedBase ()
	The virtual (empty) destructor;.

string	fullName () const
	Returns the full name of this object including its path, e.g.

string	name () const
	Returns the name of this object, without the path.

string	path () const
	Returns the path to this object including the trailing '/'.

string	comment () const
	Returns a comment assigned to this object.

void	setup (istream &is)
	Read setup info from a standard istream is.

void	update ()
	Calls the doupdate() function with recursion prevention.

void	init ()
	Calls the doinit() function with recursion prevention.

virtual bool	preInitialize () const
	Return true if this object needs to be initialized before all other objects (except those for which this function also returns true).

void	initrun ()
	Calls the doinitrun() function with recursion prevention.

void	finish ()
	Calls the dofinish() function with recursion prevention.

void	touch ()
	This function should be called every time something in this object has changed in a way that a sanity check with update() is needed.

void	reset ()
	Set the state of this object to uninitialized.

void	clear ()
	Calls reset() and unTouch().

InitState	state () const
	Return the state of initialization of this object.

bool	locked () const
	Return true if the BaseRepository is not allowed to change the state of this object.

bool	touched () const
	Return true if the state of this object has been changed since the last call to update().

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.

virtual void	debugme () const
	Print out debugging information for this object on std::cerr.

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.

virtual void	debugme () const
	Print out debugging information for this object on std::cerr.

Public Member Functions inherited from ThePEG::Pointer::ReferenceCounted
CounterType	referenceCount () const
	Return the reference count.

Public Member Functions inherited from ThePEG::Named
	Named (const string &newName=string())
	Constructor with name.

	Named (const Named &)=default
	Explicit default copy-constructor (too avoid compiler warnings)

const string &	name () const
	Return name.

bool	operator== (const Named &other) const
	Test for equality.

bool	operator< (const Named &other) const
	Lexicographical comparison.

Clone Methods.
Energy	theLambdaQCD
	The \(\Lambda_{QCD}\) for the number of flavours specified by theLambdaFlavour.

int	theLambdaFlavour
	The number of flavours for which theLambdaQCD is given.

int	theMaxFlav
	The maximum number of active flavours.

Energy	Q0
	The scale below which \(\alpha_S\) is frozen.

static ClassDescription< O1AlphaS >	initO1AlphaS
	Describe a concrete class with persistent data.

virtual IBPtr	clone () const
	Make a simple clone of this object.

virtual IBPtr	fullclone () const
	Make a clone of this object, possibly modifying the cloned object to make it sane.

O1AlphaS &	operator= (const O1AlphaS &)=delete
	Private and non-existent assignment operator.

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 void	Init ()
	Standard Init function used to initialize the interface.

Additional Inherited Members
Public Types inherited from ThePEG::InterfacedBase
enum	InitState { initializing = -1 , uninitialized = 0 , initialized = 1 , runready = 2 }
	Enumeration reflecting the state of an InterfacedBase object. More...

Public Types inherited from ThePEG::Pointer::ReferenceCounted
typedef unsigned int	CounterType
	The integer type used for counting.

Static Public Member Functions inherited from ThePEG::AlphaSBase
static void	Init ()
	Standard Init function used to initialize the interface.

Static Public Member Functions inherited from ThePEG::RunningCoupling
static void	Init ()
	Standard Init function used to initialize the interface.

Static Public Member Functions inherited from ThePEG::Interfaced
static void	Init ()
	Standard Init function.

Static Public Member Functions inherited from ThePEG::InterfacedBase
static void	Init ()
	Standard Init function.

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

Public Attributes inherited from ThePEG::Pointer::ReferenceCounted
const unsigned long	uniqueId
	The unique ID.

Protected Member Functions inherited from ThePEG::AlphaSBase
virtual void	doinit ()
	Initialize this object after the setup phase before saving an EventGenerator to disk.

Protected Member Functions inherited from ThePEG::Interfaced
void	reporeg (IBPtr object, string name) const
	Register the given object in the Repository with the given name in a subdirectory with the same name as this object.

template<typename PtrT >
bool	setDefaultReference (PtrT &ptr, string classname, string objectname)
	If the pointer, ptr, to an object is not set, create an object of class classname and register it with the Repository with the given objectname in a sib-directory with the same name as this object.

	Interfaced ()
	Protected default constructor.

	Interfaced (const string &newName)
	Protected constructor taking a name as argument.

	Interfaced (const Interfaced &i)
	Protected copy-constructor.

void	setGenerator (tEGPtr generator)
	Protected function to reset the generator pointer, required for automatic decayer generation in Herwig++ BSM models.

Protected Member Functions inherited from ThePEG::InterfacedBase
virtual void	readSetup (istream &is)
	Read setup info from a standard istream is.

virtual void	doupdate ()
	Check sanity of the object during the setup phase.

virtual void	doinitrun ()
	Initialize this object.

virtual void	dofinish ()
	Finalize this object.

virtual IVector	getReferences ()
	Return a vector of all pointers to Interfaced objects used in this object.

virtual void	rebind (const TranslationMap &)
	Rebind pointer to other Interfaced objects.

	InterfacedBase ()
	Protected default constructor.

	InterfacedBase (string newName)
	Protected constructor with the name given as argument.

	InterfacedBase (const InterfacedBase &i)
	Protected copy-constructor.

Protected Member Functions inherited from ThePEG::Pointer::ReferenceCounted
	ReferenceCounted ()
	Default constructor.

	ReferenceCounted (const ReferenceCounted &)
	Copy-constructor.

ReferenceCounted &	operator= (const ReferenceCounted &)
	Assignment.

Protected Member Functions inherited from ThePEG::Named
const Named &	operator= (const Named &other)
	Assignment.

const string &	name (const string &newName)
	Set new name.

Static Protected Member Functions inherited from ThePEG::Interfaced
static void	registerRepository (IBPtr)
	Register an Interfaced object with the Repository.

static void	registerRepository (IBPtr, string newName)
	Register an Interfaced object with the Repository, giving it a name.

Detailed Description

O1AlphaS inherits from AlphaSBase and implements the leading order running QCD coupling.

The value is determined by a \(\Lambda_{QCD}\) parameter at a given number of flavours. Optionally the coupling can be frozen under some minimum scale to avoid divergencies or negative couplings.

See also: The interfaces defined for O1AlphaS.

Definition at line 27 of file O1AlphaS.h.

Constructor & Destructor Documentation

◆ O1AlphaS()

ThePEG::O1AlphaS::O1AlphaS ( )

inline

Default constructor.

Definition at line 36 of file O1AlphaS.h.

Member Function Documentation

◆ clone()

virtual IBPtr ThePEG::O1AlphaS::clone ( ) const

protectedvirtual

Make a simple clone of this object.

Returns: a pointer to the new object.

Implements ThePEG::InterfacedBase.

◆ flavourThresholds()

virtual vector< Energy2 > ThePEG::O1AlphaS::flavourThresholds ( ) const

virtual

Return the flavour thresholds used.

The returned vector contains (in position i) the scales when the active number of flavours changes from i to i+1.

Implements ThePEG::AlphaSBase.

◆ fullclone()

virtual IBPtr ThePEG::O1AlphaS::fullclone ( ) const

protectedvirtual

Make a clone of this object, possibly modifying the cloned object to make it sane.

Returns: a pointer to the new object.

Reimplemented from ThePEG::InterfacedBase.

◆ getMaxFlav()

int ThePEG::O1AlphaS::getMaxFlav ( ) const

inline

Return the maximum number of active flavours.

Definition at line 74 of file O1AlphaS.h.

References theMaxFlav.

◆ LambdaQCDs()

virtual vector< Energy > ThePEG::O1AlphaS::LambdaQCDs ( ) const

virtual

Return the \(\Lambda_{QCD}\) used for different numbers of active flavours.

Implements ThePEG::AlphaSBase.

◆ nloops()

virtual unsigned int ThePEG::O1AlphaS::nloops ( ) const

inlinevirtual

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

Reimplemented from ThePEG::RunningCoupling.

Definition at line 55 of file O1AlphaS.h.

◆ persistentInput()

void ThePEG::O1AlphaS::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.

◆ persistentOutput()

void ThePEG::O1AlphaS::persistentOutput ( PersistentOStream & os ) const

Function used to write out object persistently.

Parameters

os	the persistent output stream written to.

◆ value()

virtual double ThePEG::O1AlphaS::value	(	Energy2	scale,
		const StandardModelBase &
	)		const

virtual

The \(\alpha_S\).

Return the QCD coupling for a given scale using the given standard model object sm.

Implements ThePEG::RunningCoupling.

Member Data Documentation

◆ initO1AlphaS

ClassDescription<O1AlphaS> ThePEG::O1AlphaS::initO1AlphaS

staticprivate

Describe a concrete class with persistent data.

Definition at line 147 of file O1AlphaS.h.

◆ Q0

Energy ThePEG::O1AlphaS::Q0

private

The scale below which \(\alpha_S\) is frozen.

Definition at line 140 of file O1AlphaS.h.

◆ theLambdaFlavour

int ThePEG::O1AlphaS::theLambdaFlavour

private

The number of flavours for which theLambdaQCD is given.

Definition at line 130 of file O1AlphaS.h.

◆ theLambdaQCD

Energy ThePEG::O1AlphaS::theLambdaQCD

private

The \(\Lambda_{QCD}\) for the number of flavours specified by theLambdaFlavour.

Other \(\Lambda_{QCD}\) values for other numbers of active flavours are calculated from flavourThresholds() using a continuity requirement.

Definition at line 125 of file O1AlphaS.h.

◆ theMaxFlav

int ThePEG::O1AlphaS::theMaxFlav

private

The maximum number of active flavours.

Definition at line 135 of file O1AlphaS.h.

Referenced by getMaxFlav().

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

O1AlphaS.h

Public Member Functions

Clone Methods.

Functions used by the persistent I/O system.

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ O1AlphaS()

Member Function Documentation

◆ clone()

◆ flavourThresholds()

◆ fullclone()

◆ getMaxFlav()

◆ LambdaQCDs()

◆ nloops()

◆ persistentInput()

◆ persistentOutput()

◆ value()

Member Data Documentation

◆ initO1AlphaS

◆ Q0

◆ theLambdaFlavour

◆ theLambdaQCD

◆ theMaxFlav