The O2AlphaS class is the implementation of the two-loop \(\alpha_S\) in the same way as in FORTRAN HERWIG. More...

#include <O2AlphaS.h>

Inheritance diagram for Herwig::O2AlphaS:

[legend]

Public Member Functions
	O2AlphaS ()
	The default constructor.

Virtual functions to override those in the base class
virtual double	value (Energy2 scale, const StandardModelBase &sm) const
	The \(\alpha_S\).

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.

Public Member Functions inherited from ThePEG::AlphaSBase
virtual vector< Energy2 >	flavourThresholds () const=0

virtual vector< Energy >	LambdaQCDs () const=0

unsigned int	Nf (Energy2 scale) const

Energy	LambdaQCD (unsigned int nflav) const

Energy	LambdaQCD (Energy2 scale) const

const vector< Energy > &	quarkMasses () const

virtual vector< Energy2 >	flavourThresholds () const=0

virtual vector< Energy >	LambdaQCDs () const=0

unsigned int	Nf (Energy2 scale) const

Energy	LambdaQCD (unsigned int nflav) const

Energy	LambdaQCD (Energy2 scale) const

const vector< Energy > &	quarkMasses () const

void	persistentOutput (PersistentOStream &os) const

void	persistentInput (PersistentIStream &is, int version)

Public Member Functions inherited from ThePEG::RunningCoupling
virtual double	value (Energy2 scale, const StandardModelBase &sm) const=0

virtual unsigned int	nloops () const

double	value (Energy2 scale) const

virtual double	overestimateValue (Energy2 scale) const

virtual double	ratioToOverestimate (Energy2) const

double	scaleFactor () const

void	persistentOutput (PersistentOStream &os) const

void	persistentInput (PersistentIStream &is, int version)

virtual double	value (Energy2 scale, const StandardModelBase &sm) const=0

virtual unsigned int	nloops () const

double	value (Energy2 scale) const

virtual double	overestimateValue (Energy2 scale) const

virtual double	ratioToOverestimate (Energy2) const

double	scaleFactor () const

Public Member Functions inherited from ThePEG::Interfaced
virtual bool	defaultInit ()

PPtr	getParticle (PID) const

PDPtr	getParticleData (PID) const

bool	used () const

void	useMe () const

tEGPtr	generator () const

void	persistentOutput (PersistentOStream &os) const

void	persistentInput (PersistentIStream &is, int version)

PPtr	getParticle (PID) const

PDPtr	getParticleData (PID) const

bool	used () const

void	useMe () const

tEGPtr	generator () const

Public Member Functions inherited from ThePEG::InterfacedBase
string	fullName () const

string	name () const

string	path () const

string	comment () const

void	setup (istream &is)

void	update ()

void	init ()

virtual bool	preInitialize () const

void	initrun ()

void	finish ()

void	touch ()

void	reset ()

void	clear ()

InitState	state () const

bool	locked () const

bool	touched () const

virtual IBPtr	fullclone () const

void	persistentOutput (PersistentOStream &os) const

void	persistentInput (PersistentIStream &is, int version)

virtual void	debugme () const

void	update ()

void	init ()

virtual bool	preInitialize () const

void	initrun ()

void	finish ()

void	touch ()

void	reset ()

void	clear ()

InitState	state () const

bool	locked () const

bool	touched () const

virtual IBPtr	fullclone () const

Public Member Functions inherited from ThePEG::Base
void	debug () const

virtual void	debugme () const

Public Member Functions inherited from ThePEG::Pointer::ReferenceCounted
CounterType	referenceCount () const

Public Member Functions inherited from ThePEG::Named
	Named (const string &newName=string())

	Named (const Named &)=default

const string &	name () const

bool	operator== (const Named &other) const

bool	operator< (const Named &other) const

Protected Member Functions
Clone Methods.
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.

virtual void	doinit ()

Protected Member Functions inherited from ThePEG::Interfaced
void	reporeg (IBPtr object, string name) const

bool	setDefaultReference (PtrT &ptr, string classname, string objectname)

	Interfaced (const string &newName)

	Interfaced (const Interfaced &i)

void	setGenerator (tEGPtr generator)

Protected Member Functions inherited from ThePEG::InterfacedBase
virtual void	readSetup (istream &is)

virtual void	doupdate ()

virtual void	doinit ()

virtual void	doinitrun ()

virtual void	dofinish ()

virtual IVector	getReferences ()

virtual void	rebind (const TranslationMap &)

virtual IBPtr	clone () const=0

	InterfacedBase (string newName)

	InterfacedBase (const InterfacedBase &i)

virtual void	readSetup (istream &is)

virtual void	doupdate ()

virtual void	doinit ()

virtual void	doinitrun ()

virtual void	dofinish ()

virtual IVector	getReferences ()

virtual void	rebind (const TranslationMap &)

Protected Member Functions inherited from ThePEG::Pointer::ReferenceCounted
	ReferenceCounted (const ReferenceCounted &)

ReferenceCounted &	operator= (const ReferenceCounted &)

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

const string &	name (const string &newName)

Standard Interfaced functions.
Energy	_lambdaQCD
	The value of \(\Lambda_{\rm QCD}\) 5-flavours in the \(\bar{\rm MS}\) scheme.

vector< double >	_bcoeff
	The values of the leading-order \(\beta\)-function coefficients.

vector< double >	_ccoeff
	The values of the next-to-leading-order \(\beta\)-function coefficients.

vector< Energy >	_lambdas
	The values of \(\Lambda_{\rm QCD}\) for the diffferent number of flavours.

vector< Energy >	_threshold
	The flavour thresholds.

vector< double >	_match
	The constants for matching.

unsigned int	_copt
	Option for the coupling.

virtual void	doinit ()
	Initialize this object after the setup phase before saving an EventGenerator to disk.

O2AlphaS &	operator= (const O2AlphaS &)=delete
	The assignment operator is private and must never be called.

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 ()
	The standard Init function used to initialize the interfaces.

Additional Inherited Members
Public Types inherited from ThePEG::InterfacedBase
enum	InitState

Public Types inherited from ThePEG::Pointer::ReferenceCounted
typedef unsigned int	CounterType

Static Public Member Functions inherited from ThePEG::AlphaSBase
static void	Init ()

Static Public Member Functions inherited from ThePEG::RunningCoupling
static void	Init ()

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

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

Static Public Member Functions inherited from ThePEG::Base
static void	Init ()

Public Attributes inherited from ThePEG::InterfacedBase
	initializing

	uninitialized

	initialized

	runready

Public Attributes inherited from ThePEG::Pointer::ReferenceCounted
const unsigned long	uniqueId

Static Protected Member Functions inherited from ThePEG::Interfaced
static void	registerRepository (IBPtr)

static void	registerRepository (IBPtr, string newName)

Detailed Description

The O2AlphaS class is the implementation of the two-loop \(\alpha_S\) in the same way as in FORTRAN HERWIG.

The input value of \(\Lambda_{\rm QCD}\) is in the \(\bar{MS}\) scheme and can either be converted to a Monte Carlo scheme, as in the FORTRAN program, or left in the \(\bar{MS}\) scheme to evaluate the running coupling

See also: The interfaces defined for O2AlphaS.

Definition at line 33 of file O2AlphaS.h.

Constructor & Destructor Documentation

◆ O2AlphaS()

Herwig::O2AlphaS::O2AlphaS ( )

inline

The default constructor.

Definition at line 40 of file O2AlphaS.h.

Member Function Documentation

◆ clone()

virtual IBPtr Herwig::O2AlphaS::clone ( ) const

inlineprotectedvirtual

Make a simple clone of this object.

Returns: a pointer to the new object.

Implements ThePEG::InterfacedBase.

Definition at line 99 of file O2AlphaS.h.

◆ doinit()

virtual void Herwig::O2AlphaS::doinit ( )

protectedvirtual

Initialize this object after the setup phase before saving an EventGenerator to disk.

Exceptions

InitException if object could not be initialized properly.

Reimplemented from ThePEG::AlphaSBase.

◆ flavourThresholds()

virtual vector< Energy2 > Herwig::O2AlphaS::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 Herwig::O2AlphaS::fullclone ( ) const

inlineprotectedvirtual

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.

Definition at line 105 of file O2AlphaS.h.

◆ Init()

static void Herwig::O2AlphaS::Init ( )

static

The standard Init function used to initialize the interfaces.

Called exactly once for each class by the class description system before the main function starts or when this class is dynamically loaded.

◆ LambdaQCDs()

virtual vector< Energy > Herwig::O2AlphaS::LambdaQCDs ( ) const

virtual

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

Implements ThePEG::AlphaSBase.

◆ operator=()

O2AlphaS & Herwig::O2AlphaS::operator= ( const O2AlphaS & )

privatedelete

The assignment operator is private and must never be called.

In fact, it should not even be implemented.

◆ persistentInput()

void Herwig::O2AlphaS::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 Herwig::O2AlphaS::persistentOutput ( PersistentOStream & os ) const

Function used to write out object persistently.

Parameters

os	the persistent output stream written to.

◆ value()

virtual double Herwig::O2AlphaS::value	(	Energy2	scale,
		const StandardModelBase &	sm
	)		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

◆ _bcoeff

vector<double> Herwig::O2AlphaS::_bcoeff

private

The values of the leading-order \(\beta\)-function coefficients.

Definition at line 141 of file O2AlphaS.h.

◆ _ccoeff

vector<double> Herwig::O2AlphaS::_ccoeff

private

The values of the next-to-leading-order \(\beta\)-function coefficients.

Definition at line 146 of file O2AlphaS.h.

◆ _copt

unsigned int Herwig::O2AlphaS::_copt

private

Option for the coupling.

Definition at line 165 of file O2AlphaS.h.

◆ _lambdaQCD

Energy Herwig::O2AlphaS::_lambdaQCD

private

The value of \(\Lambda_{\rm QCD}\) 5-flavours in the \(\bar{\rm MS}\) scheme.

Definition at line 136 of file O2AlphaS.h.

◆ _lambdas

vector<Energy> Herwig::O2AlphaS::_lambdas

private

The values of \(\Lambda_{\rm QCD}\) for the diffferent number of flavours.

Definition at line 151 of file O2AlphaS.h.

◆ _match

vector<double> Herwig::O2AlphaS::_match

private

The constants for matching.

Definition at line 161 of file O2AlphaS.h.

◆ _threshold

vector<Energy> Herwig::O2AlphaS::_threshold

private

The flavour thresholds.

Definition at line 156 of file O2AlphaS.h.

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

O2AlphaS.h

Public Member Functions

Protected Member Functions

Standard Interfaced functions.

Functions used by the persistent I/O system.

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ O2AlphaS()

Member Function Documentation

◆ clone()

◆ doinit()

◆ flavourThresholds()

◆ fullclone()

◆ Init()

◆ LambdaQCDs()

◆ operator=()

◆ persistentInput()

◆ persistentOutput()

◆ value()

Member Data Documentation

◆ _bcoeff

◆ _ccoeff

◆ _copt

◆ _lambdaQCD

◆ _lambdas

◆ _match

◆ _threshold