The PartonExtractor is a base class defining the interface to objects responsible for extracting partons from particles. More...

#include <PartonExtractor.h>

Inheritance diagram for ThePEG::PartonExtractor:

[legend]

Public Types
typedef map< cPPtr, PBIPtr >	PartonBinInstanceMap
	A map of PartonBinInstance objects indexed by the extracted parton.

Public Types inherited from ThePEG::InterfacedBase
enum	InitState { initializing = -1 , uninitialized = 0 , initialized = 1 , runready = 2 }
	Enumeration reflecting the state of an InterfacedBase object. More...

Public Types inherited from ThePEG::Pointer::ReferenceCounted
typedef unsigned int	CounterType
	The integer type used for counting.

Public Types inherited from ThePEG::LastXCombInfo< XC >
typedef ThePEG::Ptr< XC >::pointer	XCPtr
	Alias for a reference counted pointer to XC .

typedef ThePEG::Ptr< XC >::const_pointer	cXCPtr
	Alias for a reference counted pointer to a const XC .

typedef ThePEG::Ptr< XC >::transient_pointer	tXCPtr
	Alias for a transient pointer to XC .

typedef ThePEG::Ptr< XC >::transient_const_pointer	tcXCPtr
	Alias for a transient pointer to a const XC .

Public Member Functions
Standard constructors and destructors.
	PartonExtractor ()
	Default constructor.

virtual	~PartonExtractor ()
	Destructor.

Virtual functions which may be overridden in sub-classes.
virtual bool	canHandle (const cPDPair &)
	Return true if this parton extractor can handle the given types of incoming particles.

virtual PartonPairVec	getPartons (Energy maxEnergy, const cPDPair &, const Cuts &) const
	Return a vector of possible pairs of parton bins which can be produced within a given maximum total particle-particle invariant mass squared, maxEnergy sBin.

virtual Energy2	newScale ()
	May be overriden by sub-classes which have their own oppinion about what scale to use in a hard subprocess.

virtual void	colourConnect (tPPtr particle, tPPtr parton, const tPVector &remnants) const
	Connect the remnants with the colour lines of the extracted parton.

virtual PBIPair	newRemnants (tPPair oldp, tPPair newp, tStepPtr step)
	If remnants has already been created for the given parton, remove them from the given step and generate new remnants corresponding to the parton newp and add them to the step.

virtual pair< int, int >	nDims (const PBPair &pbins)
	Determine the number of random numbers needed to calculate \(\hat{s}\) and the product of all densitiy functions.

virtual void	prepare (const PBIPair &pbins)
	Prepare the given parton bin instances for generating a new event.

virtual void	updatePartonBinInstances (const PBIPair &pbins)
	Update information on the given parton bin instances.

virtual bool	generateL (const PBIPair &pbins, const double r1, const double r2)
	Generate \(l=\log(1/x)\) for all parton extractions.

virtual void	generateL (PartonBinInstance &pb, const double *r)
	Used by generateL() for each of the final parton bins.

virtual Energy2	generateSHat (Energy2 s, const PBIPair &pbins, const double r1, const double r2, bool mepartons=false)
	Generate the rest of the degrees of freedom to calculate \(\hat{s}\) and the product of all densitiy functions.

virtual double	fullFn (const PBIPair &pbins, Energy2 scale, pair< bool, bool > noLastPDF=make_pair(false, false))
	Return the product of all density functions.

virtual void	construct (const PBIPair &pbins, tStepPtr step) const
	Construct remnants and add them to the step.

virtual void	constructRemnants (const PBIPair &pbins, tSubProPtr sub, tStepPtr step) const
	Construct remnants for partons created outside of this extractor.

virtual LorentzRotation	boostRemnants (PBIPair &bins, LorentzMomentum k1, LorentzMomentum k2, bool side1, bool side2) const
	Get boost for hard subsystem and boost remnants.

Access information about the current paron extraction.
tPBIPtr	partonBinInstance (tcPPtr) const
	Return the corresponding parton bin instance for a given extracted parton.

void	select (tXCombPtr newXComb)
	Set the XComb object describing the current hard sub-process.

int	maxTries () const
	The maximum number of attempts allowed when trying to generate remnants.

tcPDFPtr	getPDF (tcPDPtr particle) const
	Return the PDFBase object to be used for the incoming particle type.

Public Member Functions inherited from ThePEG::HandlerBaseT< UseRandom >
virtual	~HandlerBaseT ()
	Destructor.

double	rnd () const
	Return a simple flat random number in the range ]0,1[.

double	rnd (double xu) const
	Return a simple flat random number in the range ]0,xu[.

double	rnd (double xl, double xu) const
	Return a simple flat random number in the range ]xl,xu[.

bool	rndbool () const
	Return true with 50% probability.

bool	rndbool (double p) const
	Return a true with probability p.

bool	rndbool (double p1, double p2) const
	Return a true with probability p1/(p1+p2).

int	rndsign (double p1, double p2, double p3) const
	Return -1, 0, or 1 with relative probabilities p1, p2, p3.

int	rnd2 (double p0, double p1) const
	Return an integer \(i\) with probability p \(i\)/(p0+p1).

int	rnd3 (double p0, double p1, double p2) const
	Return an integer \(i\) with probability p \(i\)/(p0+p1+p2).

int	rnd4 (double p0, double p1, double p2, double p3) const
	Return an integer/ \(i\) with probability p \(i\)(p0+p1+p2+p3).

long	irnd (long xu=2) const
	Return a simple flat random integrer number in the range [0,xu[.

long	irnd (long xl, long xu) const
	Return a simple flat random integrer number in the range [xl,xu[.

const StandardModelBase &	SM () const
	Return a reference to the object containing the standard model parameters for this run.

tSMPtr	standardModel () const
	Return a pointer to the object containing the standard model parameters for this run.

Public Member Functions inherited from ThePEG::Interfaced
virtual	~Interfaced ()
	Empty virtual destructor.

virtual bool	defaultInit ()
	Functions which are to be used during the actual event generation, after the setup is complete.

PPtr	getParticle (PID) const
	Create a new Particle instance given a id number.

PDPtr	getParticleData (PID) const
	Return a pointer to the ParticleData object corresponding to the given id number.

bool	used () const
	Returns true if this object has actally been used.

void	useMe () const
	Should be called to indicate that this object has actually been used.

tEGPtr	generator () const
	Return a pointer to the EventGenerator controlling the run.

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.

Public Member Functions inherited from ThePEG::InterfacedBase
virtual	~InterfacedBase ()
	The virtual (empty) destructor;.

string	fullName () const
	Returns the full name of this object including its path, e.g.

string	name () const
	Returns the name of this object, without the path.

string	path () const
	Returns the path to this object including the trailing '/'.

string	comment () const
	Returns a comment assigned to this object.

void	setup (istream &is)
	Read setup info from a standard istream is.

void	update ()
	Calls the doupdate() function with recursion prevention.

void	init ()
	Calls the doinit() function with recursion prevention.

virtual bool	preInitialize () const
	Return true if this object needs to be initialized before all other objects (except those for which this function also returns true).

void	initrun ()
	Calls the doinitrun() function with recursion prevention.

void	finish ()
	Calls the dofinish() function with recursion prevention.

void	touch ()
	This function should be called every time something in this object has changed in a way that a sanity check with update() is needed.

void	reset ()
	Set the state of this object to uninitialized.

void	clear ()
	Calls reset() and unTouch().

InitState	state () const
	Return the state of initialization of this object.

bool	locked () const
	Return true if the BaseRepository is not allowed to change the state of this object.

bool	touched () const
	Return true if the state of this object has been changed since the last call to update().

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.

virtual void	debugme () const
	Print out debugging information for this object on std::cerr.

Public Member Functions inherited from ThePEG::Base
virtual	~Base ()
	The virtual destructor.

void	debug () const
	Print out debugging information for this object on std::cerr.

virtual void	debugme () const
	Print out debugging information for this object on std::cerr.

Public Member Functions inherited from ThePEG::Pointer::ReferenceCounted
CounterType	referenceCount () const
	Return the reference count.

Public Member Functions inherited from ThePEG::Named
	Named (const string &newName=string())
	Constructor with name.

	Named (const Named &)=default
	Explicit default copy-constructor (too avoid compiler warnings)

const string &	name () const
	Return name.

bool	operator== (const Named &other) const
	Test for equality.

bool	operator< (const Named &other) const
	Lexicographical comparison.

Public Member Functions inherited from ThePEG::LastXCombInfo< XC >
const XC &	lastXComb () const
	Return a reference to the last selected XComb.

tXCPtr	lastXCombPtr () const
	Return a pointer to the last selected XComb.

const XC &	lastHeadXComb () const
	If the last selected XComb object belongs to a group of XComb's return a reference to the head XComb object for this group.

tXCPtr	lastHeadXCombPtr () const
	If the last selected XComb object belongs to a group of XComb's return a pointer to the head XComb object for this group.

const EventHandler &	lastEventHandler () const
	Return a reference to the currently used EventHandler.

tPExtrPtr	lastExtractor () const
	A pointer to the currently used parton extractor.

template<typename PDFT >
PDFT	pdf (tcPPtr parton) const
	Return the parton density used to extract the given parton.

const Cuts &	lastCuts () const
	A reference to the currently used kinematical cuts.

tCutsPtr	lastCutsPtr () const
	A pointer to the currently used kinematical cuts.

const PPair &	lastParticles () const
	Return the pair of incoming parton instances.

Energy2	lastS () const
	The last generated total energy squared of the incoming particles.

const PPair &	lastPartons () const
	Return the pair of incoming parton instances.

Energy2	lastSHat () const
	The last used interval in total parton-parton energy squared.

double	lastTau () const
	Return lastSHat()/lastS().

double	lastY () const
	The generated rapidity of the hard scattering sub-system.

double	lastP1 () const
	Log of one over the momentum fraction of the first incoming particle w.r.t.

double	lastP2 () const
	Log of one over the momentum fraction of the second incoming particle w.r.t.

double	lastL1 () const
	Log of one over the first incoming parton momentum fraction w.r.t.

double	lastL2 () const
	Log of one over the second incoming parton momentum fraction w.r.t.

double	lastX1 () const
	The first incoming parton momentum fraction w.r.t.

double	lastX2 () const
	The second incoming parton momentum fraction w.r.t.

double	lastE1 () const
	Return 1-lastX1() to highest possible precision for x \(\rightarrow\) 1.

double	lastE2 () const
	Return 1-lastX2() to highest possible precision for x \(\rightarrow\) 1.

double	lastFL1L2 () const
	The product of the parton density functions at the last generated phase-space point.

Energy2	lastScale () const
	The chosen scale of the hard scattering.

double	lastAlphaS () const
	Get the \(\alpha_S\) used in the hard scattering.

double	lastAlphaEM () const
	Get the \(\alpha_{EM}\) used in the hard scattering.

const vector< Lorentz5Momentum > &	meMomenta () const
	Return the momenta of the incoming and outgoing partons to be used by the matrix element object, in the order specified by the TreeDiagram objects given by the matrix element.

double	lastME2 () const
	Return the matrix element squared as calculated for the last phase space point.

double	lastPreweight () const
	Return the last preweight factor.

double	jacobian () const
	Get the last jacobian obtained when generating the kinematics for the call to dSigHatDR.

CrossSection	lastMECrossSection () const
	Return the partonic cross section as calculated for the last phase space point.

double	lastMEPDFWeight () const
	Return the PDF weight as calculated for the last phase space point, if the matrix element does supply PDF weights.

double	lastMECouplings () const
	Return the coupling weight as calculated for the last phase space point.

tSubProPtr	subProcess () const
	Return the SubProcess object corresponding to the last generated sub-process.

const cPDVector &	mePartonData () const
	Return the incoming and outgoing parton types to be used by the matrix element object, in the order specified by the TreeDiagram objects given by the matrix element.

Protected Member Functions
Functions used by the main virtual functions. Some of
these may be overridden in sub-classes.
virtual bool	generate (PartonBinInstance &pb, const double *r, Energy2 shat, const Lorentz5Momentum &first, bool haveMEPartons=false)
	Used by generateSHat() for each of the final parton bins.

virtual double	fullFn (const PartonBinInstance &pb, bool noLastPDF=false)
	Used by the public fullFn() for each of the final parton bins.

virtual void	construct (PartonBinInstance &pb, tStepPtr step, bool boost=true) const
	Used by the public construct() for each of the final parton bins.

PBIPtr	newRemnants (tPBIPtr oldpb, tPPtr newp, const LorentzMomentum &k)
	Used by the public newRemnants() for each of the parton bins.

void	addNewRemnants (tPBIPtr oldpb, tPBIPtr newpb, tStepPtr step)
	Used by the public newRemnants() for each of the parton bins.

virtual void	transformRemnants (LorentzMomentum &Ph, LorentzMomentum &Pr, const LorentzMomentum &k, const LorentzMomentum &P) const
	Transform remnant momentum.

virtual void	constructRemnants (PartonBinInstance &pb, LorentzMomentum &Ph, const LorentzMomentum &k) const
	Construct remnants recursively for the parton represented by pb.

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
	Register the given object in the Repository with the given name in a subdirectory with the same name as this object.

template<typename PtrT >
bool	setDefaultReference (PtrT &ptr, string classname, string objectname)
	If the pointer, ptr, to an object is not set, create an object of class classname and register it with the Repository with the given objectname in a sib-directory with the same name as this object.

	Interfaced ()
	Protected default constructor.

	Interfaced (const string &newName)
	Protected constructor taking a name as argument.

	Interfaced (const Interfaced &i)
	Protected copy-constructor.

void	setGenerator (tEGPtr generator)
	Protected function to reset the generator pointer, required for automatic decayer generation in Herwig++ BSM models.

Protected Member Functions inherited from ThePEG::InterfacedBase
virtual void	readSetup (istream &is)
	Read setup info from a standard istream is.

virtual void	doupdate ()
	Check sanity of the object during the setup phase.

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

virtual void	doinitrun ()
	Initialize this object.

virtual IVector	getReferences ()
	Return a vector of all pointers to Interfaced objects used in this object.

virtual void	rebind (const TranslationMap &)
	Rebind pointer to other Interfaced objects.

	InterfacedBase ()
	Protected default constructor.

	InterfacedBase (string newName)
	Protected constructor with the name given as argument.

	InterfacedBase (const InterfacedBase &i)
	Protected copy-constructor.

Protected Member Functions inherited from ThePEG::Pointer::ReferenceCounted
	ReferenceCounted ()
	Default constructor.

	ReferenceCounted (const ReferenceCounted &)
	Copy-constructor.

ReferenceCounted &	operator= (const ReferenceCounted &)
	Assignment.

Protected Member Functions inherited from ThePEG::Named
const Named &	operator= (const Named &other)
	Assignment.

const string &	name (const string &newName)
	Set new name.

Friends
class	XComb
	XComb is a friend.

Standard Interfaced functions.
vector< PDFPtr >	theSpecialDensities
	A list of special PDFBase objects to be used.

PDFPtr	theFirstPDF
	PDFBase object to override first PDF.

PDFPtr	theSecondPDF
	PDFBase object to override second PDF.

PDFPtr	theNoPDF
	The NoPDF object.

int	theMaxTries
	The maximum number of tries allowed when trying to produce remnants.

bool	flatSHatY
	True if this extractor should override the \(l\)-generation in the PDFs and generate a flat distribution in \(\log(\hat{s})\) and y.

static ClassDescription< PartonExtractor >	initPartonExtractor
	Describe a concrete class with persistent data.

virtual void	dofinish ()
	Finalize this object.

PartonBinInstanceMap &	partonBinInstances () const
	The PartonBinInstance's used mapped to the respective partons.

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

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.

virtual void	addPartons (tPBPtr incoming, const PDFCuts &cuts, tcPDFPtr pdf, PartonVector &pbins) const
	Add parton bins to pbins for the given incoming particle and the specified cuts.

tcPDFPtr	noPDF () const
	The NoPDF object.

template<typename Iterator >
void	findConnect (tColinePtr line, tPPtr parton, bool anti, Iterator first, Iterator last) const
	Connect the first (anti) coloured particle in the given range (not equal to parton) and connect it to the colour line.

static void	Init ()
	Standard Init function used to initialize the interface.

Additional Inherited Members
Static Public Member Functions inherited from ThePEG::HandlerBase
static void	Init ()
	Standard Init function used to initialize the interface.

Static Public Member Functions inherited from ThePEG::Interfaced
static void	Init ()
	Standard Init function.

Static Public Member Functions inherited from ThePEG::InterfacedBase
static void	Init ()
	Standard Init function.

Static Public Member Functions inherited from ThePEG::Base
static void	Init ()
	The standard Init function used to initialize the interfaces.

Public Attributes inherited from ThePEG::Pointer::ReferenceCounted
const unsigned long	uniqueId
	The unique ID.

Static Protected Member Functions inherited from ThePEG::Interfaced
static void	registerRepository (IBPtr)
	Register an Interfaced object with the Repository.

static void	registerRepository (IBPtr, string newName)
	Register an Interfaced object with the Repository, giving it a name.

Protected Attributes inherited from ThePEG::LastXCombInfo< XC >
XCPtr	theLastXComb
	The pointer to the last selected XComb.

Detailed Description

The PartonExtractor is a base class defining the interface to objects responsible for extracting partons from particles.

It is used by a SubProcessHandler which combines one PartonExtractor with a number of MEBase objects which are the used in an XComb in a StandardEventHandler to generate hard sub-processes.

PartonExtractor inherits from the general HandlerBase class and from the LastXCombInfo class to have easy acces to information about the currently chosen hard sub-process.

See also: The interfaces defined for PartonExtractor.; SubProcessHandler; MEBase; EventHandler; StandardEventHandler; XComb; HandlerBase

Definition at line 44 of file PartonExtractor.h.

Member Typedef Documentation

◆ PartonBinInstanceMap

typedef map<cPPtr,PBIPtr> ThePEG::PartonExtractor::PartonBinInstanceMap

A map of PartonBinInstance objects indexed by the extracted parton.

Definition at line 52 of file PartonExtractor.h.

Member Function Documentation

◆ boostRemnants()

virtual LorentzRotation ThePEG::PartonExtractor::boostRemnants	(	PBIPair &	bins,
		LorentzMomentum	k1,
		LorentzMomentum	k2,
		bool	side1,
		bool	side2
	)		const

virtual

Get boost for hard subsystem and boost remnants.

To be called after re-constructing remnants and obtaining new momenta of the partons entering the hard subsystem, but ignoring detailed energy and momentum conservation. Perform boosts of the remnants to conserve energy and momentum and return the boost needed for the hard subsystem. bins contains the current state of the incoming partons, including the momenta obtained after the remnant generation. k1 and k2 contains the momenta of the incoming partons before the remnant generation. If either side has no new remnants, side1 and/or side2 should be false.

◆ canHandle()

virtual bool ThePEG::PartonExtractor::canHandle ( const cPDPair & )

inlinevirtual

Return true if this parton extractor can handle the given types of incoming particles.

Definition at line 77 of file PartonExtractor.h.

◆ clone()

virtual IBPtr ThePEG::PartonExtractor::clone ( ) const

protectedvirtual

Make a simple clone of this object.

Returns: a pointer to the new object.

Implements ThePEG::InterfacedBase.

◆ construct()

virtual void ThePEG::PartonExtractor::construct	(	PartonBinInstance &	pb,
		tStepPtr	step,
		bool	boost = `true`
	)		const

protectedvirtual

Used by the public construct() for each of the final parton bins.

If boost is false, no boost is necessary to give the remnants proper momenta.

◆ constructRemnants() [1/2]

virtual void ThePEG::PartonExtractor::constructRemnants	(	const PBIPair &	pbins,
		tSubProPtr	sub,
		tStepPtr	step
	)		const

virtual

Construct remnants for partons created outside of this extractor.

Information about the incoming partons should be set in pbins and the hard subprocess should be present in sub. Generated remnants will be added to the step.

Exceptions

Veto	if remnant generation failed for whatever reason.

◆ constructRemnants() [2/2]

virtual void ThePEG::PartonExtractor::constructRemnants	(	PartonBinInstance &	pb,
		LorentzMomentum &	Ph,
		const LorentzMomentum &	k
	)		const

protectedvirtual

Construct remnants recursively for the parton represented by pb.

Used by constructRemnants(const PBIPair &, tSubProPtr, tStepPtr). Shift the momentum, Ph, of the hard subsystem to conserve energy and momentum if necessary. The momentum, k, of the parton coming into the hard subsystem from the other side is given for information. Note that Direction<0> must be set to determine if the parent particle is to be assumed to go in the positive or negative direction.

Exceptions

Veto	if remnant generation failed for whatever reason.

◆ dofinish()

virtual void ThePEG::PartonExtractor::dofinish ( )

protectedvirtual

Finalize this object.

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

Reimplemented from ThePEG::InterfacedBase.

◆ findConnect()

template<typename Iterator >

void ThePEG::PartonExtractor::findConnect	(	tColinePtr	line,
		tPPtr	parton,
		bool	anti,
		Iterator	first,
		Iterator	last
	)		const

inlineprotected

Connect the first (anti) coloured particle in the given range (not equal to parton) and connect it to the colour line.

Definition at line 340 of file PartonExtractor.h.

◆ fullclone()

virtual IBPtr ThePEG::PartonExtractor::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.

◆ fullFn()

virtual double ThePEG::PartonExtractor::fullFn	(	const PBIPair &	pbins,
		Energy2	scale,
		pair< bool, bool >	noLastPDF = `make_pair(false, false)`
	)

virtual

Return the product of all density functions.

If noLastPDF.first (.second) is true, then the PDF value multiplied by the momentum fraction for the last extracted parton from the first (second) incoming particle will be excluded.

◆ generate()

virtual bool ThePEG::PartonExtractor::generate	(	PartonBinInstance &	pb,
		const double *	r,
		Energy2	shat,
		const Lorentz5Momentum &	first,
		bool	haveMEPartons = `false`
	)

protectedvirtual

Used by generateSHat() for each of the final parton bins.

Direction<0> is set to positive(negative) for the first(second) final bin, pb. Should ask the remnant handler to generate what is needed to construct the extracted parton momentum. r is a pointer to an array of random numbers to be used and shat is the approximate invariant mass squared of the hard system produced by the extracted parton and the primary parton from the other side. first is the momentum of the original incoming particle.

Returns: false if no remnants could be generated.

◆ generateL()

virtual void ThePEG::PartonExtractor::generateL	(	PartonBinInstance &	pb,
		const double *	r
	)

virtual

Used by generateL() for each of the final parton bins.

Direction<0> is set to positive(negative) for the first(second) final bin.

◆ getPDF()

tcPDFPtr ThePEG::PartonExtractor::getPDF ( tcPDPtr particle ) const

Return the PDFBase object to be used for the incoming particle type.

If one of theSpecialDensities matches the particle type it is returned, otherwise if particle is a BeamParticleData use the PDFBase object specified there. If also this fails, return a NoPDF object.

◆ maxTries()

int ThePEG::PartonExtractor::maxTries ( ) const

inline

The maximum number of attempts allowed when trying to generate remnants.

Definition at line 208 of file PartonExtractor.h.

References theMaxTries.

◆ newRemnants() [1/2]

PBIPtr ThePEG::PartonExtractor::newRemnants	(	tPBIPtr	oldpb,
		tPPtr	newp,
		const LorentzMomentum &	k
	)

protected

Used by the public newRemnants() for each of the parton bins.

Exceptions

Veto	if remnant generation failed for whatever reason.

◆ newRemnants() [2/2]

virtual PBIPair ThePEG::PartonExtractor::newRemnants	(	tPPair	oldp,
		tPPair	newp,
		tStepPtr	step
	)

virtual

If remnants has already been created for the given parton, remove them from the given step and generate new remnants corresponding to the parton newp and add them to the step.

The new parton bins are returned.

Exceptions

Veto	if remnant generation failed for whatever reason.

◆ newScale()

virtual Energy2 ThePEG::PartonExtractor::newScale ( )

virtual

May be overriden by sub-classes which have their own oppinion about what scale to use in a hard subprocess.

The default version simply returns the previously selected scale.

◆ noPDF()

tcPDFPtr ThePEG::PartonExtractor::noPDF ( ) const

inlineprotected

The NoPDF object.

Definition at line 333 of file PartonExtractor.h.

References theNoPDF.

◆ partonBinInstances()

PartonBinInstanceMap & ThePEG::PartonExtractor::partonBinInstances ( ) const

inlineprivate

The PartonBinInstance's used mapped to the respective partons.

Definition at line 384 of file PartonExtractor.h.

References ThePEG::LastXCombInfo< XC >::lastXCombPtr().

◆ persistentInput()

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

Function used to write out object persistently.

Parameters

os	the persistent output stream written to.

◆ transformRemnants()

virtual void ThePEG::PartonExtractor::transformRemnants	(	LorentzMomentum &	Ph,
		LorentzMomentum &	Pr,
		const LorentzMomentum &	k,
		const LorentzMomentum &	P
	)		const

protectedvirtual

Transform remnant momentum.

Assuming remnants have been generated with momentum Pr without considering energy-momentum conservation, shift the momentum, possibly compensating with the momentum of the hard subsystem, Ph. For information the momentum of the parton entering the hard subsystem from the other side, k, and the momentum of the remnants parent particle , P is given. Note that Direction<0> must be set to determine if the parent particle is to be assumed to go in the positive or negative direction.

Friends And Related Function Documentation

◆ XComb

friend class XComb

friend

XComb is a friend.

Definition at line 47 of file PartonExtractor.h.

Member Data Documentation

◆ flatSHatY

bool ThePEG::PartonExtractor::flatSHatY

private

True if this extractor should override the \(l\)-generation in the PDFs and generate a flat distribution in \(\log(\hat{s})\) and y.

Definition at line 420 of file PartonExtractor.h.

◆ initPartonExtractor

ClassDescription<PartonExtractor> ThePEG::PartonExtractor::initPartonExtractor

staticprivate

Describe a concrete class with persistent data.

Definition at line 427 of file PartonExtractor.h.

◆ theFirstPDF

PDFPtr ThePEG::PartonExtractor::theFirstPDF

private

PDFBase object to override first PDF.

Definition at line 397 of file PartonExtractor.h.

◆ theMaxTries

int ThePEG::PartonExtractor::theMaxTries

private

The maximum number of tries allowed when trying to produce remnants.

Definition at line 413 of file PartonExtractor.h.

Referenced by maxTries().

◆ theNoPDF

PDFPtr ThePEG::PartonExtractor::theNoPDF

private

The NoPDF object.

Definition at line 407 of file PartonExtractor.h.

Referenced by noPDF().

◆ theSecondPDF

PDFPtr ThePEG::PartonExtractor::theSecondPDF

private

PDFBase object to override second PDF.

Definition at line 402 of file PartonExtractor.h.

◆ theSpecialDensities

vector<PDFPtr> ThePEG::PartonExtractor::theSpecialDensities

private

A list of special PDFBase objects to be used.

Definition at line 392 of file PartonExtractor.h.

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

PartonExtractor.h

Public Types

Public Member Functions

Protected Member Functions

Friends

Standard Interfaced functions.

Functions used by the persistent I/O system.

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ PartonBinInstanceMap

Member Function Documentation

◆ boostRemnants()

◆ canHandle()

◆ clone()

◆ construct()

◆ constructRemnants() [1/2]

◆ constructRemnants() [2/2]

◆ dofinish()

◆ findConnect()

◆ fullclone()

◆ fullFn()

◆ generate()

◆ generateL()

◆ getPDF()

◆ maxTries()

◆ newRemnants() [1/2]

◆ newRemnants() [2/2]

◆ newScale()

◆ noPDF()

◆ partonBinInstances()

◆ persistentInput()

◆ persistentOutput()

◆ transformRemnants()

Friends And Related Function Documentation

◆ XComb

Member Data Documentation

◆ flatSHatY

◆ initPartonExtractor

◆ theFirstPDF

◆ theMaxTries

◆ theNoPDF

◆ theSecondPDF

◆ theSpecialDensities