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// -*- C++ -*-
//
// SatPDF.h is a part of Herwig++ - A multi-purpose Monte Carlo event generator
// Copyright (C) 2002-2008 The Herwig Collaboration
//
// Herwig++ is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef HERWIG_SatPDF_H
#define HERWIG_SatPDF_H
//
// This is the declaration of the SatPDF class.
//
#include "ThePEG/PDF/PDFBase.h"
namespace Herwig {
using namespace ThePEG;
/**
* Here is the documentation of the SatPDF class. It defines
* a modified pdf which uses an existing pdf object to add
* modifications like removing the valence part of it, which
* is needed in the backward evolution of secondary scatters.
*
* \author Manuel B\"ahr
*
* @see \ref SatPDFInterfaces "The interfaces"
* defined for SatPDF.
*/
class SatPDF: public PDFBase {
public:
/** @name Standard constructors and destructors. */
//@{
/**
* The default constructor.
*/
inline SatPDF() : thePDF(PDFPtr()), theX0(1E-4), theExp(0.0) {}
/**
* The copy constructor.
*/
inline SatPDF(const SatPDF & x) :
PDFBase(x), thePDF(x.thePDF), theX0(x.theX0), theExp(x.theExp) {}
/**
* The destructor.
*/
virtual ~SatPDF();
//@}
public:
/** @name Virtual functions to be overridden by sub-classes. */
//@{
/**
* Return true if this PDF can handle the extraction of partons from
* the given \a particle.
*/
virtual bool canHandleParticle(tcPDPtr particle) const;
/**
* Return the partons which this PDF may extract from the given
* \a particle.
*/
virtual cPDVector partons(tcPDPtr particle) const;
/**
* The density. Return the pdf for the given \a parton inside the
* given \a particle for the virtuality \a partonScale and momentum
* fraction \a x. The \a particle is assumed to have a virtuality \a
* particleScale.
*/
virtual double xfx(tcPDPtr particle, tcPDPtr parton, Energy2 partonScale,
double x, double eps=0.0, Energy2 particleScale = ZERO) const;
/**
* The valence density. Return the pdf for the given cvalence \a
* parton inside the given \a particle for the virtuality \a
* partonScale and momentum fraction \a x. The \a particle is
* assumed to have a virtuality \a particleScale. If not overidden
* by a sub class this implementation will assume that the
* difference between a quark and anti-quark distribution is due do
* valense quarks, but return zero for anything else.
*/
virtual double xfvx(tcPDPtr particle, tcPDPtr parton, Energy2 partonScale,
double x, double eps=0.0, Energy2 particleScale = ZERO) const;
//@}
public:
/** @name Functions used by the persistent I/O system. */
//@{
/**
* Function used to write out object persistently.
* @param os the persistent output stream written to.
*/
void persistentOutput(PersistentOStream & os) const;
/**
* Function used to read in object persistently.
* @param is the persistent input stream read from.
* @param version the version number of the object when written.
*/
void persistentInput(PersistentIStream & is, int version);
//@}
/**
* 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.
*/
static void Init();
protected:
/** @name Clone Methods. */
//@{
/**
* Make a simple clone of this object.
* @return a pointer to the new object.
*/
inline virtual IBPtr clone() const { return new_ptr(*this); }
/** Make a clone of this object, possibly modifying the cloned object
* to make it sane.
* @return a pointer to the new object.
*/
inline virtual IBPtr fullclone() const { return new_ptr(*this); }
//@}
// If needed, insert declarations of virtual function defined in the
// InterfacedBase class here (using ThePEG-interfaced-decl in Emacs).
private:
/**
* The static object used to initialize the description of this class.
* Indicates that this is a concrete class with persistent data.
*/
static ClassDescription<SatPDF> initSatPDF;
/**
* The assignment operator is private and must never be called.
* In fact, it should not even be implemented.
*/
SatPDF & operator=(const SatPDF &);
/**
* pointer to the underlying ThePEG::PDFBase object, we are modifying.
*/
PDFPtr thePDF;
/**
* x from where the extrapolation f(x) = f(theX0) * (x/theX0)**theExp
* is used for the pdf's.
*/
double theX0;
/**
* the exponent of the pdf extrapolation for small x (x < theX0).
*/
double theExp;
};
}
#include "ThePEG/Utilities/ClassTraits.h"
namespace ThePEG {
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the
* base classes of SatPDF. */
template <>
struct BaseClassTrait<Herwig::SatPDF,1> {
/** Typedef of the first base class of SatPDF. */
typedef PDFBase NthBase;
};
/** This template specialization informs ThePEG about the name of
* the SatPDF class and the shared object where it is defined. */
template <>
struct ClassTraits<Herwig::SatPDF>
: public ClassTraitsBase<Herwig::SatPDF> {
/** Return a platform-independent class name */
static string className() { return "Herwig::SatPDF"; }
/**
* The name of a file containing the dynamic library where the class
* SatPDF is implemented. It may also include several, space-separated,
* libraries if the class SatPDF depends on other classes (base classes
* excepted). In this case the listed libraries will be dynamically
* linked in the order they are specified.
*/
static string library() { return "HwSatPDF.so"; }
};
/** @endcond */
}
#ifndef HERWIG_TEMPLATES_IN_CC_FILE
// #include "SatPDF.tcc"
#endif
#endif /* HERWIG_SatPDF_H */

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