ThePEG::SimpleFlavour Class Reference

SimpleFlavour is a simple class to generate hadrons given the quark flavours. More...

#include <SimpleFlavour.h>

Inheritance diagram for ThePEG::SimpleFlavour:

List of all members.

Public Types
typedef map< long, VSelector < pair< long, long > > >	ProbabilityMap
	A map of Selectors.
Public Member Functions
Standard constructors and destructors.
	SimpleFlavour ()
	Default constructor.
virtual	~SimpleFlavour ()
	Destructor.
Virtual functions mandated by the FlavourGenerator base class.
virtual tcPDPair	generateHadron (tcPDPtr quark) const
	Generate a hadron from a quark.
virtual tcPDPtr	getHadron (long iq1, long iq2) const
	Get hadron from flavours.
virtual tcPDPtr	getBaryon (long q1, long q2, long q3) const
	Return a baryon with the flavour content given by the (anti)quarks in the argument.
virtual long	selectQuark () const
	Generate a random quark flavour.
virtual long	selectFlavour () const
	Generate a random (di)quark flavour.
Access the parameters controlling the generation.
double	sSup () const
	Return the suppression factor of strange quarks w.r.t.
double	diSup () const
	Return the suppression factor for di-quarks w.r.t.
double	di1Sup () const
	Return the suppression of spin-1 di-quarks w.r.t.
double	diSSup () const
	Return the suppression of strange di-quarks w.r.t.
double	etaSup () const
	Return the extra suppression of eta's.
double	etaPSup () const
	Return the extra suppression of ets-prime's.
double	baryon10Sup () const
	Return the extra suppression for baryons of the spin 3/2 decuplet.
double	pSpin1 () const
	Return the probability that light (u/d) mesons has spin 1;.
double	pSpinS1 () const
	Return the probability that strange mesons has spin 1;.
double	pSpinC1 () const
	Return the probability that charmed and heavier mesons has spin 1;.
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 interfaces.
Protected Member Functions
virtual void	setProbabilities (long iq) const
	Calculate the probabilities for generateHadron for the given flavour.
virtual double	vectorMesonProbability (long iq1, long iq2) const
	Return the probability that the given quark flavours end up in a vector meson rather than in a pseudo scalar meson.
virtual double	baryonDecupletProbability (long iq1, long iq2) const
	Return the probability that the given quark and diquark flavours end up in a spin 3/2 decuplet baryon rather than in a spin 1/2 octet baryon.
virtual tcPDPtr	pseudoScalarMeson (long iq, long iqbar) const
	Return a pseudo scalar meson formed by the two quark flavours.
virtual tcPDPtr	vectorMeson (long iq, long iqbar) const
	Return a vector meson formed by the two quark flavours.
virtual tcPDPtr	baryonOctet (long iq, long idq) const
	Return a spin 1/2 octet baryon formed by the given quark and diquark flavours.
virtual tcPDPtr	baryonDecuplet (long iq, long idq) const
	Return a spin 3/2 decuplet baryon formed by the given quark and diquark flavours.
virtual long	pseudoScalarId (long iqh, long iql) const
	Return the PDG code of a pseudo scalar meson formed by the two quark flavours for iqh >= iql > 0.
virtual long	vectorId (long iqh, long iql) const
	Return the PDG code of a vector meson formed by the two quark flavours for iqh >= iql > 0.
virtual long	baryonOctetId (long iqa, long iqb, long iqc, long iq, bool dqs1) const
	Return the PDG code for a spin 1/2 octet baryon formed by the given quark flavours (iqa >= iqb >= iqc > 0).
virtual long	baryonDecupletId (long iqa, long iqb, long iqc) const
	Return the PDG code for a spin 3/2 decuplet baryon formed by the given quark flavours (iqa >= iqb >= iqc > 0).
virtual vector< pair< long, double > >	pseudoScalarIds (long iqh, long iql) const
	Return the PDG code of pseudo scalar mesons formed by the two quark flavours (for iqh >= iql > 0), together with suitable weights.
virtual vector< pair< long, double > >	vectorIds (long iqh, long iql) const
	Return the PDG codes of vector mesons formed by the two quark flavours (for iqh >= iql > 0), together with suitable weights.
virtual vector< pair< long, double > >	baryonOctetIds (long iqa, long iqb, long iqc, long iq, bool dqs1) const
	Return the PDG codes for spin 1/2 octet baryons formed by the given quark flavours (iqa >= iqb >= iqc > 0) together with suitable weights.
virtual vector< pair< long, double > >	baryonDecupletIds (long iqa, long iqb, long iqc) const
	Return the PDG codes for spin 3/2 decuplet baryons formed by the given quark flavours (iqa >= iqb >= iqc > 0) together with suitable weights.
void	clear ()
	Clear all cashed weights.
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	doinit ()
	Initialize this object after the setup phase before saving an EventGenerator to disk.
virtual void	doinitrun ()
	Initialize this object.
Static Protected Member Functions
static double	weightSU6QDiQSpin (long iq, long idq, int spin)
	Return the SU(6) weight for the given quark and di-quark flavours to end up with in a baryon with the given spin (2S+1).
Private Member Functions
SimpleFlavour &	operator= (const SimpleFlavour &)
	Private and non-existent assignment operator.
Private Attributes
double	theSSup
	Suppression factor of strange quarks w.r.t.
double	theDiSup
	Suppression factor for di-quarks w.r.t.
double	theDi1Sup
	Suppression of spin-1 di-quarks w.r.t.
double	theDiSSup
	Suppression of strange di-quarks w.r.t.
double	theEtaSup
	Extra suppression of eta's.
double	theEtaPSup
	Extra suppression of ets-prime's.
double	theBaryon10Sup
	Extra suppression for baryons of the spin 3/2 decuplet.
double	thePSpin1
	Probability that light (u/d) mesons has spin 1.
double	thePSpinS1
	Probability that strange mesons has spin 1.
double	thePSpinC1
	Probability that charmed and heavier mesons has spin 1.
VSelector< long >	theFlavourSelector
	A selector used to weight the creation of (di)quark-anti(di)quark pairs.
ProbabilityMap	theProbabilities
	A map of selectors to cash probabilities for generateHadron.
Static Private Attributes
static ClassDescription < SimpleFlavour >	initSimpleFlavour
	Describe a concrete class with persistent data.

---

Detailed Description

SimpleFlavour is a simple class to generate hadrons given the quark flavours.

It implements a simplified version of the model of the old fortran version of Pythia.

See also:

The interfaces defined for SimpleFlavour.

Definition at line 28 of file SimpleFlavour.h.

---

Member Typedef Documentation

typedef map<long, VSelector< pair<long,long> > > ThePEG::SimpleFlavour::ProbabilityMap

A map of Selectors.

Definition at line 33 of file SimpleFlavour.h.

---

Member Function Documentation

virtual tcPDPair ThePEG::SimpleFlavour::generateHadron

(

tcPDPtr

quark

)

const [virtual]

Generate a hadron from a quark.

Given a quark(antiquark, diquark or antidiquark), choose a quark-antiquark (or antidiquark-diquark) pair. Return (first) a hadron formed by the original quark and the antiquark together with (second) the generated quark. Returns null pointers if the generation failed.

Parameters:

quark

a quark, antiquark, diquark or antidiquark.

Returns:

a pair of ParticleData pointers. The first is the hadron produced and the second is the anti-partner of the (anti-)(di-)quark generated to form the hadron.

Implements ThePEG::FlavourGenerator.

virtual tcPDPtr ThePEG::SimpleFlavour::getHadron	(	long	iq1,
		long	iq2
	)			const [virtual]

Get hadron from flavours.

Return a hadron with the flavour content given by the (anti-)(di-)quarks in the argument. The arguments are given as PDG codes.

Parameters:

	iq1	the PDG code of the first flavour.
	iq2	the PDG code of the second flavour.

Returns:

the corresponding hadron type or null if none could be generated.

Reimplemented from ThePEG::FlavourGenerator.

virtual tcPDPtr ThePEG::SimpleFlavour::getBaryon	(	long	q1,
		long	q2,
		long	q3
	)			const [virtual]

Return a baryon with the flavour content given by the (anti)quarks in the argument.

The arguments are given as particle data pointers.

Parameters:

	q1	the PDG code of the first flavour.
	q2	the PDG code of the second flavour.
	q3	the PDG code of the third flavour.

Returns:

the corresponding baryon type or null if none could be generated.

Reimplemented from ThePEG::FlavourGenerator.

double ThePEG::SimpleFlavour::sSup

(

)

const [inline]

Return the suppression factor of strange quarks w.r.t.

u and d.

Definition at line 110 of file SimpleFlavour.h.

References theSSup.

double ThePEG::SimpleFlavour::diSup

(

)

const [inline]

Return the suppression factor for di-quarks w.r.t.

quarks

Definition at line 115 of file SimpleFlavour.h.

References theDiSup.

double ThePEG::SimpleFlavour::di1Sup

(

)

const [inline]

Return the suppression of spin-1 di-quarks w.r.t.

spin-0 ones;

Definition at line 120 of file SimpleFlavour.h.

References theDi1Sup.

double ThePEG::SimpleFlavour::diSSup

(

)

const [inline]

Return the suppression of strange di-quarks w.r.t.

u and d ones in addition to the standard strangness suppression of quarks.

Definition at line 126 of file SimpleFlavour.h.

References theDiSSup.

virtual long ThePEG::SimpleFlavour::baryonOctetId	(	long	iqa,
		long	iqb,
		long	iqc,
		long	iq,
		bool	dqs1
	)			const [protected, virtual]

Return the PDG code for a spin 1/2 octet baryon formed by the given quark flavours (iqa >= iqb >= iqc > 0).

iq is one of the flavours and the other two are assumed to be in a diquark (in a spin-1 state if dqs1).

virtual vector< pair<long,double> > ThePEG::SimpleFlavour::baryonOctetIds	(	long	iqa,
		long	iqb,
		long	iqc,
		long	iq,
		bool	dqs1
	)			const [protected, virtual]

Return the PDG codes for spin 1/2 octet baryons formed by the given quark flavours (iqa >= iqb >= iqc > 0) together with suitable weights.

iq is one of the flavours and the other two are assumed to be in a diquark (in a spin-1 state if dqs1).

void ThePEG::SimpleFlavour::persistentOutput

(

PersistentOStream &

os

)

const

Function used to write out object persistently.

Parameters:

os

the persistent output stream written to.

Reimplemented from ThePEG::FlavourGenerator.

void ThePEG::SimpleFlavour::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::FlavourGenerator.

virtual IBPtr ThePEG::SimpleFlavour::clone

(

)

const [protected, virtual]

Make a simple clone of this object.

Returns:

a pointer to the new object.

Implements ThePEG::InterfacedBase.

virtual IBPtr ThePEG::SimpleFlavour::fullclone

(

)

const [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 ThePEG::SimpleFlavour::doinit

(

)

[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 ThePEG::SimpleFlavour::doinitrun

(

)

[protected, virtual]

Initialize this object.

Called in the run phase just before a run begins.

Reimplemented from ThePEG::InterfacedBase.

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Member Data Documentation

double ThePEG::SimpleFlavour::theSSup [private]

Suppression factor of strange quarks w.r.t.

u and d.

Definition at line 338 of file SimpleFlavour.h.

Referenced by sSup().

double ThePEG::SimpleFlavour::theDiSup [private]

Suppression factor for di-quarks w.r.t.

quarks.

Definition at line 343 of file SimpleFlavour.h.

Referenced by diSup().

double ThePEG::SimpleFlavour::theDi1Sup [private]

Suppression of spin-1 di-quarks w.r.t.

spin-0 ones.

Definition at line 348 of file SimpleFlavour.h.

Referenced by di1Sup().

double ThePEG::SimpleFlavour::theDiSSup [private]

Suppression of strange di-quarks w.r.t.

u and d ones in addition to the standard strangness suppression of quarks.

Definition at line 354 of file SimpleFlavour.h.

Referenced by diSSup().

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

• SimpleFlavour.h