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Herwig  7.1.5
Herwig::O2AlphaS Class Reference

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:

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 $\alpha_S$. More...
 
virtual vector< Energy2 > flavourThresholds () const
 Return the flavour thresholds used. More...
 
virtual vector< Energy > LambdaQCDs () const
 Return the $\Lambda_{QCD}$ used for different numbers of active flavours.
 
Functions used by the persistent I/O system.
void persistentOutput (PersistentOStream &os) const
 Function used to write out object persistently. More...
 
void persistentInput (PersistentIStream &is, int version)
 Function used to read in object persistently. More...
 
- Public Member Functions inherited from ThePEG::AlphaSBase
const vector< Energy > & quarkMasses () const
 
unsigned int Nf (Energy2 scale) const
 
Energy LambdaQCD (unsigned int nflav) const
 
Energy LambdaQCD (Energy2 scale) const
 
void persistentOutput (PersistentOStream &os) const
 
void persistentInput (PersistentIStream &is, int version)
 
unsigned int Nf (Energy2 scale) const
 
Energy LambdaQCD (unsigned int nflav) const
 
Energy LambdaQCD (Energy2 scale) const
 
void persistentOutput (PersistentOStream &os) const
 
void persistentInput (PersistentIStream &is, int version)
 
- Public Member Functions inherited from ThePEG::RunningCoupling
double value (Energy2 scale) const
 
virtual double overestimateValue (Energy2 scale) const
 
virtual double ratioToOverestimate (Energy2) const
 
double scaleFactor () const
 
virtual unsigned int nloops () const
 
void persistentOutput (PersistentOStream &os) const
 
void persistentInput (PersistentIStream &is, int version)
 
virtual unsigned int nloops () const
 
void persistentOutput (PersistentOStream &os) const
 
void persistentInput (PersistentIStream &is, int version)
 
- 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
 
void persistentOutput (PersistentOStream &os) const
 
void persistentInput (PersistentIStream &is, int version)
 
- Public Member Functions inherited from ThePEG::InterfacedBase
string fullName () const
 
string name () const
 
string path () const
 
string comment () const
 
void setup (istream &is)
 
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
 
void persistentOutput (PersistentOStream &os) const
 
void persistentInput (PersistentIStream &is, int version)
 
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
 
void persistentOutput (PersistentOStream &os) const
 
void persistentInput (PersistentIStream &is, int version)
 
- Public Member Functions inherited from ThePEG::Base
void debug () const
 
- Public Member Functions inherited from ThePEG::Pointer::ReferenceCounted
CounterType referenceCount () const
 
- Public Member Functions inherited from ThePEG::Named
 Named (const string &newName=string())
 
const string & name () const
 
bool operator== (const Named &other) const
 
bool operator< (const Named &other) const
 

Static Public Member Functions

static void Init ()
 The standard Init function used to initialize the interfaces. More...
 
- 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 ()
 

Protected Member Functions

Clone Methods.
virtual IBPtr clone () const
 Make a simple clone of this object. More...
 
virtual IBPtr fullclone () const
 Make a clone of this object, possibly modifying the cloned object to make it sane. More...
 
Standard Interfaced functions.
virtual void doinit ()
 Initialize this object after the setup phase before saving an EventGenerator to disk. More...
 
- 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
 InterfacedBase (string newName)
 
 InterfacedBase (const InterfacedBase &i)
 
virtual void readSetup (istream &is)
 
virtual void doupdate ()
 
virtual void doinitrun ()
 
virtual void dofinish ()
 
virtual IVector getReferences ()
 
virtual void rebind (const TranslationMap &)
 
virtual void readSetup (istream &is)
 
virtual void doupdate ()
 
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 &)
 
ReferenceCountedoperator= (const ReferenceCounted &)
 
 ReferenceCounted (const ReferenceCounted &)
 
ReferenceCountedoperator= (const ReferenceCounted &)
 
- Protected Member Functions inherited from ThePEG::Named
const Namedoperator= (const Named &other)
 
const string & name (const string &newName)
 

Private Member Functions

O2AlphaSoperator= (const O2AlphaS &)=delete
 The assignment operator is private and must never be called. More...
 

Private Attributes

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.
 

Static Private Attributes

static ClassDescription< O2AlphaSinitO2AlphaS
 The static object used to initialize the description of this class. More...
 

Additional Inherited Members

- Public Types inherited from ThePEG::InterfacedBase
enum  InitState
 
- Public Types inherited from ThePEG::Pointer::ReferenceCounted
typedef unsigned int CounterType
 
- 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.

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
InitExceptionif 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.

◆ 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
isthe persistent input stream read from.
versionthe version number of the object when written.

◆ persistentOutput()

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

Function used to write out object persistently.

Parameters
osthe 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

◆ initO2AlphaS

ClassDescription<O2AlphaS> Herwig::O2AlphaS::initO2AlphaS
staticprivate

The static object used to initialize the description of this class.

Indicates that this is a concrete class with persistent data.

Definition at line 128 of file O2AlphaS.h.


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