ThePEG::WeizsackerWilliamsPDF Class Reference

Here is the documentation of the WeizsackerWilliamsPDF class. More...

#include <WeizsackerWilliamsPDF.h>

Inheritance diagram for ThePEG::WeizsackerWilliamsPDF:

ThePEG::PDFBase ThePEG::HandlerBase ThePEG::HandlerBaseT< T > ThePEG::Interfaced ThePEG::InterfacedBase ThePEG::Base ThePEG::Named ThePEG::Pointer::ReferenceCounted

List of all members.

Public Member Functions

 WeizsackerWilliamsPDF ()
 Default constructor.
Virtual functions to be overridden by sub-classes.
virtual bool canHandleParticle (tcPDPtr particle) const
 Return true if this PDF can handle the extraction of partons from the given particle.
virtual cPDVector partons (tcPDPtr particle) const
 Return the partons which this PDF may extract from the given particle.
virtual double xfl (tcPDPtr particle, tcPDPtr parton, Energy2 partonScale, double l, Energy2 particleScale=ZERO) const
 The density.
virtual double xfvl (tcPDPtr particle, tcPDPtr parton, Energy2 partonScale, double l, Energy2 particleScale=ZERO) const
 The valence density.
virtual double flattenScale (tcPDPtr particle, tcPDPtr parton, const PDFCuts &cut, double l, double z, double &jacobian) const
 Generate scale (as a fraction of the maximum scale).
virtual double flattenL (tcPDPtr particle, tcPDPtr parton, const PDFCuts &cut, double z, double &jacobian) const
 Generate a momentum fraction.
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 ()
 The standard Init function used to initialize the interfaces.

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.

Private Member Functions

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

Private Attributes

Energy2 _q2min
 Minimum $Q^2$ for the photon.
Energy2 _q2max
 Maximum $Q^2$ for the photon.

Static Private Attributes

static ClassDescription
< WeizsackerWilliamsPDF > 		initWeizsackerWilliamsPDF
 The static object used to initialize the description of this class.

Detailed Description

Here is the documentation of the WeizsackerWilliamsPDF class.

See also:
The interfaces defined for WeizsackerWilliamsPDF.

Definition at line 20 of file WeizsackerWilliamsPDF.h.

Member Function Documentation

virtual double ThePEG::WeizsackerWilliamsPDF::xfl ( tcPDPtr  particle,
tcPDPtr  parton,
Energy2  partonScale,
double  l,
Energy2  particleScale = ZERO 
) const [virtual]

The density.

Return the pdf for the given parton inside the given particle for the virtuality partonScale and logarithmic momentum fraction l $(l=\log(1/x)$. The particle is assumed to have a virtuality particleScale.

Reimplemented from ThePEG::PDFBase.

virtual double ThePEG::WeizsackerWilliamsPDF::xfvl ( tcPDPtr  particle,
tcPDPtr  parton,
Energy2  partonScale,
double  l,
Energy2  particleScale = ZERO 
) const [virtual]

The valence density.

Return the pdf for the given cvalence parton inside the given particle for the virtuality partonScale and logarithmic momentum fraction l $(l=\log(1/x)$. The particle is assumed to have a virtuality particleScale. If not overidden by a sub class this will return zero.

Reimplemented from ThePEG::PDFBase.

virtual double ThePEG::WeizsackerWilliamsPDF::flattenScale ( tcPDPtr  particle,
tcPDPtr  parton,
const PDFCuts &  cut,
double  l,
double  z,
double &  jacobian 
) const [virtual]

Generate scale (as a fraction of the maximum scale).

If the PDF contains strange peaks which can be difficult to handle, this function may be overwritten to return an appropriate scale $Q^2/Q^2_{\max}$ for a z uniformly distributed in ]0,1[. Also the jacobobian of the $Q^2/Q^2_{\max}\rightarrow z$ variable transformation must multiply the jacobian argument. The default version will simply use the function $Q^2/Q^2_{\max} = (Q^2_{\max}/Q^2_{\min})^(z-1)$ or, if $Q^2_{\min}$ is zero, $Q^2/Q^2_{\max} = z$ (where the limits are set by cut).

Reimplemented from ThePEG::PDFBase.

virtual double ThePEG::WeizsackerWilliamsPDF::flattenL ( tcPDPtr  particle,
tcPDPtr  parton,
const PDFCuts &  cut,
double  z,
double &  jacobian 
) const [virtual]

Generate a momentum fraction.

If the PDF contains strange peaks which can be difficult to handle, this function may be overwritten to return an appropriate $l=\log(1/x)$ for a z uniformly distributed in ]0,1[. Also the jacobobian of the $l\rightarrow z$ variable transformation must in the function multiply the jacobian argument. The default version will simply use the function $l(z) = l_{\min} + z*(l_{\max}-l_{\min})$ (where the limits are set by cut).

Reimplemented from ThePEG::PDFBase.

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

Function used to write out object persistently.

Parameters:
os the persistent output stream written to.

Reimplemented from ThePEG::PDFBase.

void ThePEG::WeizsackerWilliamsPDF::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::PDFBase.

static void ThePEG::WeizsackerWilliamsPDF::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.

Reimplemented from ThePEG::PDFBase.

virtual IBPtr ThePEG::WeizsackerWilliamsPDF::clone (  )  const [inline, protected, virtual]

Make a simple clone of this object.

Returns:
a pointer to the new object.

Implements ThePEG::InterfacedBase.

Definition at line 127 of file WeizsackerWilliamsPDF.h.

References ThePEG::Pointer::new_ptr().

virtual IBPtr ThePEG::WeizsackerWilliamsPDF::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.

Definition at line 133 of file WeizsackerWilliamsPDF.h.

References ThePEG::Pointer::new_ptr().

WeizsackerWilliamsPDF& ThePEG::WeizsackerWilliamsPDF::operator= ( const WeizsackerWilliamsPDF &   )  [private]

The assignment operator is private and must never be called.

In fact, it should not even be implemented.

Member Data Documentation

ClassDescription<WeizsackerWilliamsPDF> ThePEG::WeizsackerWilliamsPDF::initWeizsackerWilliamsPDF [static, private]

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

Indicates that this is an concrete class without persistent data.

Definition at line 142 of file WeizsackerWilliamsPDF.h.

The documentation for this class was generated from the following file:
Generated on Thu Apr 29 12:43:15 2010 for ThePEG by  doxygen 1.5.5