Pythia7::LundPtGenerator Class Reference

LundPtGenerator is the transverse momentum generator used in the Lund string fragmentation scheme. More...

#include <LundPtGenerator.h>

Inheritance diagram for Pythia7::LundPtGenerator:

List of all members.

Public Member Functions

Standard constructors and destructors.

LundPtGenerator ()

Default constructor.

LundPtGenerator (const LundPtGenerator &)

Copy-constructor.

virtual ~LundPtGenerator ()

Destructor.

Virtual functions required by the PtGenerator class.

virtual TransverseMomentum generate () const

Generate ( $k_x, k_y$ ) components of the transverse momentum.

Access to parameters.

Energy Sigma () const

Get the gaussian width.

double NGaussFraction () const

Get the non-Gaussian fraction of the Gaussian transverse momentum distribution to be enhanced by the factor nGaussFactor().

double NGaussFactor () const

Get the non-Gaussian tails enhancement factor.

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.

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.

Standard Interfaced functions.

virtual void doupdate () throw (UpdateException)

Check sanity of the object during the setup phase.

virtual void doinit () throw (InitException)

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

virtual void dofinish ()

Finalize this object.

Private Member Functions

LundPtGenerator & operator= (const LundPtGenerator &)

Private and non-existent assignment operator.

Private Attributes

Energy sigma

The gaussian width.

double nGaussfraction

The non-Gaussian fraction of the Gaussian transverse momentum distribution to be enhanced by the factor nGaussFactor().

double nGaussfactor

The non-Gaussian tails enhancement factor.

Static Private Attributes

static ClassDescription
< LundPtGenerator > initLundPtGenerator

Describe a concrete class with persistent data.

Detailed Description

LundPtGenerator is the transverse momentum generator used in the Lund string fragmentation scheme.

It generates the $(p_x,p_y)$ components of the transverse momentum of a quark (diquark) in a $q-\bar{q}$ (or a $(qq)-(\overline{qq})$ ) pair created in the string colour field, according to the flavour independent Gaussian distribution in $p_x$ and $p_y$ including the possibility of non-Gaussian tails.

LundPtGenerator inherits the from the PtGenerator class and overrides the generate() function.

Note that the 4-vector version of the transverse momentum is obtained given the transverse vectors of the StringRegion where the pair is produced.

See also:: The interfaces defined for LundPtGenerator.

Definition at line 34 of file LundPtGenerator.h.

Member Function Documentation

virtual TransverseMomentum Pythia7::LundPtGenerator::generate ( ) const [virtual]

Generate ( $k_x, k_y$ ) components of the transverse momentum.

They will be distributed as $\exp(-k_\perp^2/\sigma^2)k_\perp dk_\perp$ with $k_\perp^2=k_x^2+k_y^2$ and $\sigma=$ Sigma().

Implements ThePEG::PtGenerator.

void Pythia7::LundPtGenerator::persistentOutput ( PersistentOStream & os ) const

Function used to write out object persistently.

Parameters:

os

the persistent output stream written to.

Reimplemented from ThePEG::Interfaced.

void Pythia7::LundPtGenerator::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.

virtual IBPtr Pythia7::LundPtGenerator::clone ( ) const [inline, protected, virtual]

Make a simple clone of this object.

Returns:: a pointer to the new object.

Implements ThePEG::InterfacedBase.

virtual IBPtr Pythia7::LundPtGenerator::fullclone ( ) const [inline, protected, virtual]

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.

virtual void Pythia7::LundPtGenerator::doinit ( ) throw (InitException) [inline, protected, virtual]

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.

virtual void Pythia7::LundPtGenerator::dofinish ( ) [inline, protected, virtual]

Finalize this object.

Called in the run phase just after a run has ended. Used eg. to write out statistics.

Reimplemented from ThePEG::InterfacedBase.

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

LundPtGenerator.h


Public Member Functions
Standard constructors and destructors.
	LundPtGenerator ()
	Default constructor.
	LundPtGenerator (const LundPtGenerator &)
	Copy-constructor.
virtual	~LundPtGenerator ()
	Destructor.
Virtual functions required by the PtGenerator class.
virtual TransverseMomentum	generate () const
	Generate () components of the transverse momentum.
Access to parameters.
Energy	Sigma () const
	Get the gaussian width.
double	NGaussFraction () const
	Get the non-Gaussian fraction of the Gaussian transverse momentum distribution to be enhanced by the factor nGaussFactor().
double	NGaussFactor () const
	Get the non-Gaussian tails enhancement factor.
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.
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.
Standard Interfaced functions.
virtual void	doupdate () throw (UpdateException)
	Check sanity of the object during the setup phase.
virtual void	doinit () throw (InitException)
	Initialize this object after the setup phase before saving an EventGenerator to disk.
virtual void	dofinish ()
	Finalize this object.
Private Member Functions
LundPtGenerator &	operator= (const LundPtGenerator &)
	Private and non-existent assignment operator.
Private Attributes
Energy	sigma
	The gaussian width.
double	nGaussfraction
	The non-Gaussian fraction of the Gaussian transverse momentum distribution to be enhanced by the factor nGaussFactor().
double	nGaussfactor
	The non-Gaussian tails enhancement factor.
Static Private Attributes
static ClassDescription < LundPtGenerator >	initLundPtGenerator
	Describe a concrete class with persistent data.