ThePEG::QuarksToHadronsDecayer Class Reference

The QuarksToHadronsDecayer class inherits from Decayer and is able to decay particles to $n_q$ (2 or 4) quarks which then are decayed to hadrons according to phase space. More...

#include <QuarksToHadronsDecayer.h>

Inheritance diagram for ThePEG::QuarksToHadronsDecayer:

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

List of all members.

Public Member Functions

virtual int getN (Energy m0, Energy summq, int Nq) const
 Get the number of hadrons to be produced, given the mass of the decaying particle, m0, and the number, Nq and summed masses of the quarks, summq.
virtual PVector getHadrons (int Nh, tcPDVector quarks) const
 Produce Nh hadrons from the specified quarks.
virtual void distribute (const Particle &parent, PVector &children) const
 Distribute the produced children in phase space.
virtual double reweight (const Particle &parent, const PVector &children) const
 Called by distribute() to reweight the default flat phase spece.
int fixedN () const
 Return the fixed number of hadrons to be produced.
int minN () const
 Return the minimum number of hadrons to be produced.
double c1 () const
 Return the parameter $c_1$ used for the multiplicity distriution.
Energy c2 () const
 Return the parameter $c_2$ used for the multiplicity distriution.
double c3 () const
 Return the parameter $c_3$ used for the multiplicity distriution.
tcFlavGenPtr flavourGenerator () const
 Return a pointer to the flavour generator to be used.
Standard constructors and destructors.
 QuarksToHadronsDecayer ()
 Default constructor.
virtual ~QuarksToHadronsDecayer ()
 Destructor.
Virtual functions required by the Decayer class.
virtual bool accept (const DecayMode &dm) const
 Check if this decayer can perfom the decay specified by the given decay mode.
virtual ParticleVector decay (const DecayMode &dm, const Particle &p) const
 Perform a decay for a given DecayMode and a given Particle instance.
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

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

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

Private Attributes

int theFixedN
 The fixed number of hadrons to be produced.
int theMinN
 The minimum hadrons to be produced.
double theC1
 The parameter $c_1$ of the multiplicity distribution.
Energy theC2
 The parameter $c_2$ of the multiplicity distribution.
double theC3
 The parameter $c_3$ of the multiplicity distribution.
FlavGenPtr theFlavourGenerator
 The object in charge of generating hadrons spieces from given quark flavours.

Static Private Attributes

static ClassDescription
< QuarksToHadronsDecayer > 		initQuarksToHadronsDecayer
 Describe a concrete class with persistent data.

Detailed Description

The QuarksToHadronsDecayer class inherits from Decayer and is able to decay particles to $n_q$ (2 or 4) quarks which then are decayed to hadrons according to phase space.

The number of final hadrons can either be given by a fixed number or as a Gaussian multiplicity distribution centered around $c+n_q/4+c_3$ and a width $\sqrt{c}$, where $c = c_1 \log((m - \sum m)/c_2)$, $m$ is the mass of the decaying particle, $\sum m$ the sum of the quark masses and $c_i$ real parameters.

See also:
The interfaces defined for QuarksToHadronsDecayer.

ParticleData

Definition at line 35 of file QuarksToHadronsDecayer.h.

Member Function Documentation

virtual bool ThePEG::QuarksToHadronsDecayer::accept ( const DecayMode &  dm  )  const [virtual]

Check if this decayer can perfom the decay specified by the given decay mode.

Parameters:
dm the DecayMode describing the decay.
Returns:
true if this decayer can handle the given mode, otherwise false.

Implements ThePEG::Decayer.

Reimplemented in ThePEG::WeakToHadronsDecayer.

virtual ParticleVector ThePEG::QuarksToHadronsDecayer::decay ( const DecayMode &  dm,
const Particle &  p 
) const [virtual]

Perform a decay for a given DecayMode and a given Particle instance.

Parameters:
dm the DecayMode describing the decay.
p the Particle instance to be decayed.
Returns:
a ParticleVector containing the decay products.

Implements ThePEG::Decayer.

virtual PVector ThePEG::QuarksToHadronsDecayer::getHadrons ( int  Nh,
tcPDVector  quarks 
) const [virtual]

Produce Nh hadrons from the specified quarks.

The last quark is considered to be a spectator quark.

Reimplemented in ThePEG::WeakToHadronsDecayer.

virtual void ThePEG::QuarksToHadronsDecayer::distribute ( const Particle &  parent,
PVector &  children 
) const [virtual]

Distribute the produced children in phase space.

This default version uses a flat phase space which can be reweighted by overriding the reweight() function.

virtual double ThePEG::QuarksToHadronsDecayer::reweight ( const Particle &  parent,
const PVector &  children 
) const [virtual]

Called by distribute() to reweight the default flat phase spece.

Can be overridden by sub-classes and should return a number between 0 and 1. This version returns 1.

Reimplemented in ThePEG::WeakToHadronsDecayer.

int ThePEG::QuarksToHadronsDecayer::fixedN (  )  const [inline]

Return the fixed number of hadrons to be produced.

If less than 2, the number is instead given by a gaussian multiplicity distribution.

Definition at line 110 of file QuarksToHadronsDecayer.h.

References theFixedN.

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

Function used to write out object persistently.

Parameters:
os the persistent output stream written to.

Reimplemented from ThePEG::Decayer.

Reimplemented in ThePEG::WeakToHadronsDecayer.

void ThePEG::QuarksToHadronsDecayer::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::Decayer.

Reimplemented in ThePEG::WeakToHadronsDecayer.

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

Make a simple clone of this object.

Returns:
a pointer to the new object.

Implements ThePEG::InterfacedBase.

Reimplemented in ThePEG::WeakToHadronsDecayer.

virtual IBPtr ThePEG::QuarksToHadronsDecayer::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.

Reimplemented in ThePEG::WeakToHadronsDecayer.

Member Data Documentation

int ThePEG::QuarksToHadronsDecayer::theFixedN [private]

The fixed number of hadrons to be produced.

If less than 2, the number is instead given by a gaussian multiplicity distribution.

Definition at line 190 of file QuarksToHadronsDecayer.h.

Referenced by fixedN().

The documentation for this class was generated from the following file:
Generated on Thu Apr 29 12:43:18 2010 for ThePEG by  doxygen 1.5.5