The MEBase class is the base class of all objects representing hard matrix elements in ThePEG. More...

#include <MEBase.h>

Inheritance diagram for ThePEG::MEBase:

[legend]

Public Types
typedef vector< DiagPtr >	DiagramVector
	A vector of pointers to DiagramBase objects. More...

typedef DiagramVector::size_type	DiagramIndex
	The size_type used in the DiagramVector. More...

typedef vector< ReweightPtr >	ReweightVector
	A vector of pointers to ReweightBase objects. More...

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< StandardXComb >
typedef ThePEG::Ptr< StandardXComb >::pointer	XCPtr
	Alias for a reference counted pointer to XC . More...

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

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

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

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

virtual	~MEBase ()
	Destructor.

Virtual functions to be overridden by sub-classes..
virtual unsigned int	orderInAlphaS () const =0
	Return the order in $\alpha_S$ in which this matrix element is given.

virtual unsigned int	orderInAlphaEW () const =0
	Return the order in $\alpha_{EM}$ in which this matrix element is given. More...

virtual double	me2 () const =0
	Return the matrix element for the kinematical configuation previously provided by the last call to setKinematics(), suitably scaled by sHat() to give a dimension-less number.

virtual Energy2	scale () const =0
	Return the scale associated with the phase space point provided by the last call to setKinematics().

virtual double	alphaS () const
	Return the value of $\alpha_S$ associated with the phase space point provided by the last call to setKinematics(). More...

virtual double	alphaEM () const
	Return the value of $\alpha_EM$ associated with the phase space point provided by the last call to setKinematics(). More...

void	setKinematics (tPPair in, const PVector &out)
	Set the typed and momenta of the incoming and outgoing partons to be used in subsequent calls to me() and colourGeometries().

virtual void	setKinematics ()
	Set the typed and momenta of the incoming and outgoing partons to be used in subsequent calls to me() and colourGeometries() according to the associated XComb object. More...

virtual void	constructVertex (tSubProPtr sub)
	construct the spin information for the interaction

virtual void	constructVertex (tSubProPtr sub, const ColourLines *cl)
	construct the spin information for the interaction

virtual int	nDim () const
	The number of internal degreed of freedom used in the matrix element. More...

virtual bool	generateKinematics (const double *r)=0
	Generate internal degrees of freedom given nDim() uniform random numbers in the interval ]0,1[. More...

virtual bool	wantCMS () const
	Return true, if this matrix element expects the incoming partons in their center-of-mass system.

virtual bool	headCuts () const
	If this is a dependent matrix element in a ME group, return true, if cuts should be inherited from the head matrix element, i.e. More...

virtual bool	ignoreCuts () const
	If this is a dependent matrix element in a ME group, return true, if cuts should be ignored.

virtual bool	apply () const
	If this is a dependent matrix element in a ME group, return true, if it applies to the process set in lastXComb()

virtual CrossSection	dSigHatDR () const =0
	Return the matrix element squared differential in the variables given by the last call to generateKinematics().

virtual map< string, double >	generateOptionalWeights ()
	If variations are available for the subprocess handled, generate and return a map of optional weights to be included for the event.

virtual bool	haveX1X2 () const
	Return true, if this matrix element will generate momenta for the incoming partons itself. More...

virtual bool	havePDFWeight1 () const
	Return true, if this matrix element provides the PDF weight for the first incoming parton itself.

virtual bool	havePDFWeight2 () const
	Return true, if this matrix element provides the PDF weight for the second incoming parton itself.

virtual bool	keepRandomNumbers () const
	Return true, if the XComb steering this matrix element should keep track of the random numbers used to generate the last phase space point.

virtual void	generateSubCollision (SubProcess &)
	Comlete a SubProcess object using the internal degrees of freedom generated in the last generateKinematics() (and possible other degrees of freedom which was intergated over in dSigHatDR(). More...

virtual void	clearKinematics ()
	Clear the information previously provided by a call to setKinematics(...).

virtual void	getDiagrams () const =0
	Add all possible diagrams with the add() function.

virtual bool	noMirror () const
	Return true, if this matrix element does not want to make use of mirroring processes; in this case all possible partonic subprocesses with a fixed assignment of incoming particles need to be provided through the diagrams added with the add(...) method.

const DiagramVector &	diagrams () const
	Return all possible diagrams.

virtual Selector< const ColourLines * >	colourGeometries (tcDiagPtr diag) const =0
	Return a Selector with possible colour geometries for the selected diagram weighted by their relative probabilities.

virtual const ColourLines &	selectColourGeometry (tcDiagPtr diag) const
	Select a ColpurLines geometry. More...

virtual Selector< DiagramIndex >	diagrams (const DiagramVector &) const
	With the information previously supplied with the setKinematics(...) method, a derived class may optionally override this method to weight the given diagrams with their (although certainly not physical) relative probabilities.

virtual DiagramIndex	diagram (const DiagramVector &) const
	Select a diagram. More...

bool	reweighted () const
	Return true if this matrix element has associated (p)reWeight objects assigned.

double	reWeight () const
	With the information previously supplied with the setKinematics(...) methods, return the combined effects of the reweighters.

double	preWeight () const
	With the information previously supplied with the setKinematics(...) methods, return the comined effects of the peweighters.

void	addReweighter (tReweightPtr rw)
	Add objects to the list of reweighters.

void	addPreweighter (tReweightPtr rw)
	Add objects to the list of preweighters.

Ptr< Amplitude >::pointer	amplitude () const
	Return the amplitude associated with this matrix element. More...

void	amplitude (Ptr< Amplitude >::pointer amp)
	Set the amplitude associated with this matrix element.

Acces information about the last generated phase space point.
Energy2	sHat () const
	Return the last set invariant mass squared.

double	preweight () const
	Return the factor with which this matrix element was last pre-weighted.

virtual void	flushCaches ()
	Inform this matrix element that a new phase space point is about to be generated, so all caches should be flushed.

virtual StdXCombPtr	makeXComb (Energy newMaxEnergy, const cPDPair &inc, tEHPtr newEventHandler, tSubHdlPtr newSubProcessHandler, tPExtrPtr newExtractor, tCascHdlPtr newCKKW, const PBPair &newPartonBins, tCutsPtr newCuts, const DiagramVector &newDiagrams, bool mir, const PartonPairVec &allPBins, tStdXCombPtr newHead=tStdXCombPtr(), tMEPtr newME=tMEPtr())
	For the given event generation setup return a xcomb object appropriate to this matrix element.

virtual StdXCombPtr	makeXComb (tStdXCombPtr newHead, const PBPair &newPartonBins, const DiagramVector &newDiagrams, tMEPtr newME=tMEPtr())
	For the given event generation setup return a dependent xcomb object appropriate to this matrix element.

virtual void	fillProjectors ()
	Fill the projectors object of xcombs to choose subprocesses different than the one currently integrated.

virtual void	setXComb (tStdXCombPtr)
	Set the XComb object to be used in the next call to generateKinematics() and dSigHatDR().

const DVector &	meInfo () const
	Retrieve information obtained in the calculation of the cross section to be used later when selecting diagrams and colour flow.

void	meInfo (const DVector &info) const
	Save information obtained in the calculation of the cross section to be used later when selecting diagrams and colour flow.

virtual int	maxMultCKKW () const
	If this matrix element is to be used together with others for CKKW reweighting and veto, this should give the multiplicity of outgoing particles in the highest multiplicity matrix element in the group.

virtual int	minMultCKKW () const
	If this matrix element is to be used together with others for CKKW reweighting and veto, this should give the multiplicity of outgoing particles in the lowest multiplicity matrix element in the group.

virtual void	maxMultCKKW (int mult)
	If this matrix element is to be used together with others for CKKW reweighting and veto, this will set the multiplicity of outgoing particles in the highest multiplicity matrix element in the group.

virtual void	minMultCKKW (int mult)
	If this matrix element is to be used together with others for CKKW reweighting and veto, this will set the multiplicity of outgoing particles in the lowest multiplicity matrix element in the group.

virtual void	setVetoScales (tSubProPtr) const
	Set veto scales on the particles at the given SubProcess which has been generated using this matrix element.

Functions used by the persistent I/O system.
void	persistentOutput (PersistentOStream &os) const
	Function used to write out object persistently. More...

void	persistentInput (PersistentIStream &is, int version)
	Function used to read in object persistently. More...

Public Member Functions inherited from ThePEG::HandlerBaseT< UseRandom >
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 with probability p /(p0+p1).

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

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

virtual	~HandlerBaseT ()
	Destructor.

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. More...

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. More...

void	persistentOutput (PersistentOStream &os) const
	Function used to write out object persistently. More...

void	persistentInput (PersistentIStream &is, int version)
	Function used to read in object persistently. More...

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. More...

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

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

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

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

virtual IBPtr	fullclone () const
	Return a full clone of this object possibly doing things to the clone to make it sane.

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

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). More...

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. More...

void	persistentInput (PersistentIStream &is, int version)
	Function used to read in object persistently. More...

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. More...

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< StandardXComb >
const StandardXComb &	lastXComb () const
	Return a reference to the last selected XComb.

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

const StandardXComb &	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.

PDFT	pdf (tcPPtr parton) const
	Return the parton density used to extract the given parton. More...

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. More...

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

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

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

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

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

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. More...

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

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. More...

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. More...

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

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.

Static Public Member Functions
static void	Init ()
	Standard Init function used to initialize the interfaces.

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. More...

Protected Member Functions
void	add (DiagPtr dp) const
	To be used by sub classes in the getDiagrams() method to add included diagrams.

vector< Lorentz5Momentum > &	meMomenta ()
	Access the momenta set by the last call to generateKinematics().

void	lastME2 (double v) const
	Set the matrix element squared as calculated for the last phase space point. More...

void	lastPreweight (double w) const
	Set the last preweight factor.

void	lastMECrossSection (CrossSection v) const
	Set the partonic cross section as calculated for the last phase space point. More...

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

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

void	jacobian (double j)
	Set the last jacobian obtained when generating the kinematics for the call to dSigHatDR.

void	use (tcMEPtr other)
	Initialize all member variables from another MEBase object. More...

void	useDiagrams (tcMEPtr other) const
	Initialize the diagrams from another MEBase object.

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

virtual void	doinitrun ()
	Initialize this object. More...

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. More...

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 IBPtr	clone () const =0
	Return a simple clone of this object. More...

	InterfacedBase ()
	Protected default constructor.

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

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

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

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

virtual void	dofinish ()
	Finalize this object. More...

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

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

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.

Private Member Functions
MEBase &	operator= (const MEBase &)=delete
	Private and non-existent assignment operator.

Private Attributes
DiagramVector	theDiagrams
	The diagrams included for this matrix element.

ReweightVector	reweights
	The reweight objects modifying this matrix element.

ReweightVector	preweights
	The preweight objects modifying this matrix element.

Ptr< Amplitude >::pointer	theAmplitude
	The amplitude associated with this matrix element.

int	theMaxMultCKKW
	If this matrix element is to be used together with others for CKKW reweighting and veto, this should give the multiplicity of outgoing particles in the highest multiplicity matrix element in the group.

int	theMinMultCKKW
	If this matrix element is to be used together with others for CKKW reweighting and veto, this should give the multiplicity of outgoing particles in the lowest multiplicity matrix element in the group.

Static Private Attributes
static AbstractClassDescription< MEBase >	initMEBase
	Describe an abstract base class with persistent data.

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

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< StandardXComb >
XCPtr	theLastXComb
	The pointer to the last selected XComb.

Detailed Description

The MEBase class is the base class of all objects representing hard matrix elements in ThePEG.

There are three methods which must be overridden by a concrete subclass:

includedDiagrams(tcPDPair) should return a vector of DiagramBase objects describing the diagrams used for this matrix element for the given pair of incoming parton types. These DiagramBases are used to identify the incoming and outgoing partons which can be handled by the process generation scheme, and is also used to cnstruct a corresponding SubProcess object.

scale() should return the scale associated with the phase space point set with the last call to setKinematics(...) or generateKinematics(...).

me() should return the the matrix element squared using the the type and momentum of the incoming and outgoing partons, previously set by the setKinematics(...) or generateKinematics(...) member functions, accessible through the methods meMomenta() and mePartonData() inherited from LastXCombInfo, and/or from information stored by sub classes. The returned value should be dimensionless suitable scaled by the total invariant mass squared (accessible through the sHat() member function). Any user of this method must make sure that the setKinematics(...) member function has been appropriately called before.

colourGeometries() should return a Selector with the possible ColourLines objects weighted by their relative probabilities given the information set by the last call to setKinematics(...) or generateKinematics(...).

There are other virtula functions which may be overridden as listed below.

See also: The interfaces defined for MEBase.; DiagramBase; ColourLines

Definition at line 72 of file MEBase.h.

Member Typedef Documentation

◆ DiagramIndex

typedef DiagramVector::size_type ThePEG::MEBase::DiagramIndex

The size_type used in the DiagramVector.

Definition at line 79 of file MEBase.h.

◆ DiagramVector

typedef vector<DiagPtr> ThePEG::MEBase::DiagramVector

A vector of pointers to DiagramBase objects.

Definition at line 77 of file MEBase.h.

◆ ReweightVector

typedef vector<ReweightPtr> ThePEG::MEBase::ReweightVector

A vector of pointers to ReweightBase objects.

Definition at line 81 of file MEBase.h.

Member Function Documentation

◆ alphaEM()

virtual double ThePEG::MEBase::alphaEM ( ) const

virtual

Return the value of $\alpha_EM$ associated with the phase space point provided by the last call to setKinematics().

This versions returns SM().alphaEM(scale()).

Reimplemented in ThePEG::MEGroup.

◆ alphaS()

virtual double ThePEG::MEBase::alphaS ( ) const

virtual

Return the value of $\alpha_S$ associated with the phase space point provided by the last call to setKinematics().

This versions returns SM().alphaS(scale()).

Reimplemented in ThePEG::MEGroup.

◆ amplitude()

Ptr<Amplitude>::pointer ThePEG::MEBase::amplitude ( ) const

inline

Return the amplitude associated with this matrix element.

This function is allowed to return the null pointer if the amplitude is not available.

Definition at line 360 of file MEBase.h.

References theAmplitude.

◆ diagram()

virtual DiagramIndex ThePEG::MEBase::diagram ( const DiagramVector & ) const

virtual

Select a diagram.

Default version uses diagrams(const DiagramVector &) to select a diagram according to the weights. This is the only method used that should be outside of MEBase.

Reimplemented in ThePEG::MEGroup.

Referenced by diagrams().

◆ doinit()

virtual void ThePEG::MEBase::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.

Reimplemented in ThePEG::MEGroup, ThePEG::MENCDIS, and ThePEG::MEee2gZ2qq.

Referenced by add().

◆ doinitrun()

virtual void ThePEG::MEBase::doinitrun ( )

protectedvirtual

Initialize this object.

Called in the run phase just before a run begins.

Reimplemented from ThePEG::InterfacedBase.

Reimplemented in ThePEG::MEGroup.

Referenced by add().

◆ generateKinematics()

virtual bool ThePEG::MEBase::generateKinematics ( const double * r )

pure virtual

Generate internal degrees of freedom given nDim() uniform random numbers in the interval ]0,1[.

To help the phase space generator, the 'dSigHatDR' should be a smooth function of these numbers, although this is not strictly necessary. The return value should be true of the generation succeeded. If so the generated momenta should be stored in the meMomenta() vector.

Implemented in ThePEG::MEGroup, and ThePEG::ME2to2Base.

Referenced by setKinematics().

◆ generateSubCollision()

virtual void ThePEG::MEBase::generateSubCollision ( SubProcess & )

virtual

Comlete a SubProcess object using the internal degrees of freedom generated in the last generateKinematics() (and possible other degrees of freedom which was intergated over in dSigHatDR().

This default version does nothing. Will be made purely virtual in the future.

Reimplemented in ThePEG::MEGroup.

Referenced by keepRandomNumbers().

◆ haveX1X2()

virtual bool ThePEG::MEBase::haveX1X2 ( ) const

inlinevirtual

Return true, if this matrix element will generate momenta for the incoming partons itself.

The matrix element is required to store the incoming parton momenta in meMomenta()[0,1]. No mapping in tau and y is performed by the PartonExtractor object, if a derived class returns true here. The phase space jacobian is to include a factor 1/(x1 x2).

Reimplemented in ThePEG::MEGroup.

Definition at line 231 of file MEBase.h.

◆ headCuts()

virtual bool ThePEG::MEBase::headCuts ( ) const

inlinevirtual

If this is a dependent matrix element in a ME group, return true, if cuts should be inherited from the head matrix element, i.e.

no cut is being applied to the dependent matrix element if the head configuration has passed the cuts.

Definition at line 194 of file MEBase.h.

◆ lastME2()

void ThePEG::MEBase::lastME2 ( double v ) const

protected

Set the matrix element squared as calculated for the last phase space point.

This may optionally be used by a matrix element for caching.

◆ lastMECrossSection()

void ThePEG::MEBase::lastMECrossSection ( CrossSection v ) const

protected

Set the partonic cross section as calculated for the last phase space point.

This may optionally be used by a matrix element for caching.

◆ lastMEPDFWeight()

void ThePEG::MEBase::lastMEPDFWeight ( double v ) const

protected

Set the PDF weight as calculated for the last phase space point, if the matrix element does supply PDF weights.

This may optionally be used by a matrix element for caching.

◆ nDim()

virtual int ThePEG::MEBase::nDim ( ) const

virtual

The number of internal degreed of freedom used in the matrix element.

This default version returns 0;

Reimplemented in ThePEG::MEGroup, and ThePEG::ME2to2Base.

Referenced by setKinematics().

◆ orderInAlphaEW()

virtual unsigned int ThePEG::MEBase::orderInAlphaEW ( ) const

pure virtual

Return the order in $\alpha_{EM}$ in which this matrix element is given.

Returns 0.

Implemented in ThePEG::MENCDIS, ThePEG::MEGroup, ThePEG::ME2to2QCD, and ThePEG::MEee2gZ2qq.

◆ persistentInput()

void ThePEG::MEBase::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.

Referenced by setVetoScales().

◆ persistentOutput()

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

Function used to write out object persistently.

Parameters

os	the persistent output stream written to.

Referenced by setVetoScales().

◆ selectColourGeometry()

virtual const ColourLines& ThePEG::MEBase::selectColourGeometry ( tcDiagPtr diag ) const

virtual

Select a ColpurLines geometry.

The default version returns a colour geometry selected among the ones returned from colourGeometries(tcDiagPtr).

Reimplemented in ThePEG::MEGroup.

Referenced by diagrams().

◆ setKinematics()

virtual void ThePEG::MEBase::setKinematics ( )

inlinevirtual

Set the typed and momenta of the incoming and outgoing partons to be used in subsequent calls to me() and colourGeometries() according to the associated XComb object.

If the function is overridden in a sub class the new function must call the base class one first.

Reimplemented in ThePEG::MEGroup, and ThePEG::ME2to2Base.

Definition at line 154 of file MEBase.h.

References constructVertex(), generateKinematics(), and nDim().

Referenced by ThePEG::MEGroup::setKinematics().

◆ use()

void ThePEG::MEBase::use ( tcMEPtr other )

protected

Initialize all member variables from another MEBase object.

remove?

Referenced by add().

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

MEBase.h

Public Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Private Member Functions

Private Attributes

Static Private Attributes

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ DiagramIndex

◆ DiagramVector

◆ ReweightVector

Member Function Documentation

◆ alphaEM()

◆ alphaS()

◆ amplitude()

◆ diagram()

◆ doinit()

◆ doinitrun()

◆ generateKinematics()

◆ generateSubCollision()

◆ haveX1X2()

◆ headCuts()

◆ lastME2()

◆ lastMECrossSection()

◆ lastMEPDFWeight()

◆ nDim()

◆ orderInAlphaEW()

◆ persistentInput()

◆ persistentOutput()

◆ selectColourGeometry()

◆ setKinematics()

◆ use()