This class splits the gluons from the end of the shower. More...

#include <PartonSplitter.h>

Inheritance diagram for Herwig::PartonSplitter:

[legend]

Public Member Functions
	PartonSplitter ()
	Default constructor.

void	split (PVector &tagged)
	This method does the nonperturbative splitting of: time-like gluons.

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.

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.
double	_splitPwtUquark
	Different variables for the weight for splitting into various light quark species.

double	_splitPwtDquark

double	_splitPwtSquark

Selector< PDPtr, double >	_quarkSelector
	The selector to pick the type of quark.

Length	_gluonDistance
	c tau for gluon decays

int	_splitGluon
	Flag used to determine between normal gluon splitting and alternative gluon splitting.

vector< int >	_colSingletSize
	Vector that stores the index in the event record of the anti-triplet of the colour-singlets, or of a colourless particle.

vector< Energy2 >	_colSingletm2
	Vector that stores the masses of the colour-singlets or of a colourless particle.

int	_enhanceSProb
	Option to choose which functional form to use for strangeness production.

Energy	_m0
	Characteristic mass scale for strangeness enhancement.

int	_massMeasure
	Flag that switches between mass measures used in strangeness enhancement: cluster mass, or the lambda measure - ( m_{clu}^2 - (m_q + m_{qbar})^2 )

const double	_maxScale = 20.
	Constant variable that stops the scale in strangeness enhancement from becoming too large.

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

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

void	splitTimeLikeGluon (tcPPtr gluon, PPtr &quark, PPtr &anti)
	Non-perturbatively split a time-like gluon, if something goes wrong null pointers are returned.

void	massSplitTimeLikeGluon (tcPPtr gluon, PPtr &quark, PPtr &anti, size_t i)
	Non-perturbatively split a time-like gluon using a mass-based strangeness enhancement, if something goes wrong null pointers are returned.

void	colourSorted (PVector &tagged)
	Colour-sort the event into grouped colour-singlets.

double	enhanceStrange (size_t i)
	Method to calculate the probability for producing strange quarks.

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::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

This class splits the gluons from the end of the shower.

Author: Philip Stephens; Alberto Ribon

This class does all of the nonperturbative parton splittings needed immediately after the end of the showering (both initial and final), as very first step of the cluster hadronization.

the quarks are attributed with different weights for the splitting by default only the splitting in u and d quarks is allowed the option "set /Herwig/Hadronization/PartonSplitter:Split 1" allows for additional splitting into s quarks based on some weight in order for that to work the mass of the strange quark has to be changed from the default value s.t. m_g > 2m_s

See also
The interfaces defined for PartonSplitter.

Definition at line 44 of file PartonSplitter.h.

Constructor & Destructor Documentation

◆ PartonSplitter()

Herwig::PartonSplitter::PartonSplitter ( )

inline

Default constructor.

Definition at line 51 of file PartonSplitter.h.

Member Function Documentation

◆ clone()

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

protectedvirtual

Make a simple clone of this object.

Returns: a pointer to the new object.

Implements ThePEG::InterfacedBase.

◆ colourSorted()

void Herwig::PartonSplitter::colourSorted ( PVector & tagged )

private

Colour-sort the event into grouped colour-singlets.

Convention: triplet - gluons - antitriplet, repeat for all other colour-singlets or colourless particles.

◆ doinit()

virtual void Herwig::PartonSplitter::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::InterfacedBase.

◆ fullclone()

virtual IBPtr Herwig::PartonSplitter::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.

◆ Init()

static void Herwig::PartonSplitter::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.

◆ massSplitTimeLikeGluon()

void Herwig::PartonSplitter::massSplitTimeLikeGluon	(	tcPPtr	gluon,
		PPtr &	quark,
		PPtr &	anti,
		size_t	i
	)

private

Non-perturbatively split a time-like gluon using a mass-based strangeness enhancement, if something goes wrong null pointers are returned.

Parameters

gluon	The gluon to be split
quark	The quark produced in the splitting
anti	The antiquark produced in the splitting
gluon's	index in the colour-sorted Particle vector

◆ persistentInput()

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

Function used to write out object persistently.

Parameters

os	the persistent output stream written to.

◆ split()

void Herwig::PartonSplitter::split ( PVector & tagged )

This method does the nonperturbative splitting of: time-like gluons.

At the end of the shower the gluons should be on a "physical" mass shell and should therefore be time-like.

Parameters

tagged The tagged particles to be split

Returns: The particles which were not split and the products of splitting.

◆ splitTimeLikeGluon()

void Herwig::PartonSplitter::splitTimeLikeGluon	(	tcPPtr	gluon,
		PPtr &	quark,
		PPtr &	anti
	)

private

Non-perturbatively split a time-like gluon, if something goes wrong null pointers are returned.

Parameters

gluon	The gluon to be split
quark	The quark produced in the splitting
anti	The antiquark produced in the splitting

Member Data Documentation

◆ _colSingletm2

vector<Energy2> Herwig::PartonSplitter::_colSingletm2

private

Vector that stores the masses of the colour-singlets or of a colourless particle.

Definition at line 203 of file PartonSplitter.h.

◆ _colSingletSize

vector<int> Herwig::PartonSplitter::_colSingletSize

private

Vector that stores the index in the event record of the anti-triplet of the colour-singlets, or of a colourless particle.

Definition at line 197 of file PartonSplitter.h.

◆ _enhanceSProb

int Herwig::PartonSplitter::_enhanceSProb

private

Option to choose which functional form to use for strangeness production.

Definition at line 209 of file PartonSplitter.h.

◆ _gluonDistance

Length Herwig::PartonSplitter::_gluonDistance

private

c tau for gluon decays

Definition at line 186 of file PartonSplitter.h.

◆ _m0

Energy Herwig::PartonSplitter::_m0

private

Characteristic mass scale for strangeness enhancement.

Definition at line 214 of file PartonSplitter.h.

◆ _massMeasure

int Herwig::PartonSplitter::_massMeasure

private

Flag that switches between mass measures used in strangeness enhancement: cluster mass, or the lambda measure - ( m_{clu}^2 - (m_q + m_{qbar})^2 )

Definition at line 220 of file PartonSplitter.h.

◆ _maxScale

const double Herwig::PartonSplitter::_maxScale = 20.

private

Constant variable that stops the scale in strangeness enhancement from becoming too large.

Definition at line 226 of file PartonSplitter.h.

◆ _quarkSelector

Selector<PDPtr,double> Herwig::PartonSplitter::_quarkSelector

private

The selector to pick the type of quark.

Definition at line 181 of file PartonSplitter.h.

◆ _splitGluon

int Herwig::PartonSplitter::_splitGluon

private

Flag used to determine between normal gluon splitting and alternative gluon splitting.

Definition at line 191 of file PartonSplitter.h.

◆ _splitPwtDquark

double Herwig::PartonSplitter::_splitPwtDquark

private

Definition at line 175 of file PartonSplitter.h.

◆ _splitPwtSquark

double Herwig::PartonSplitter::_splitPwtSquark

private

Definition at line 176 of file PartonSplitter.h.

◆ _splitPwtUquark

double Herwig::PartonSplitter::_splitPwtUquark

private

Different variables for the weight for splitting into various light quark species.

Definition at line 174 of file PartonSplitter.h.

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

PartonSplitter.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

◆ PartonSplitter()

Member Function Documentation

◆ clone()

◆ colourSorted()

◆ doinit()

◆ fullclone()

◆ Init()

◆ massSplitTimeLikeGluon()

◆ persistentInput()

◆ persistentOutput()

◆ split()

◆ splitTimeLikeGluon()

Member Data Documentation

◆ _colSingletm2

◆ _colSingletSize

◆ _enhanceSProb

◆ _gluonDistance

◆ _m0

◆ _massMeasure

◆ _maxScale

◆ _quarkSelector

◆ _splitGluon

◆ _splitPwtDquark

◆ _splitPwtSquark

◆ _splitPwtUquark