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Herwig++  2.7.0
Herwig::MEqq2gZ2ff Class Reference

The MEqq2gZ2ff class implements the products of Standard Model fermion antifermion pairs via the $Z^0$ resonance including photon interference terms. More...

#include <MEqq2gZ2ff.h>

Inheritance diagram for Herwig::MEqq2gZ2ff:

List of all members.

Public Member Functions

 MEqq2gZ2ff ()
 The default constructor.
Virtual functions required by the MEBase class.
virtual unsigned int orderInAlphaS () const
 Return the order in $\alpha_S$ in which this matrix element is given.
virtual unsigned int orderInAlphaEW () const
 Return the order in $\alpha_{EW}$ in which this matrix element is given.
virtual double me2 () const
 The matrix element for the kinematical configuration previously provided by the last call to setKinematics(), suitably scaled by sHat() to give a dimension-less number.
virtual Energy2 scale () const
 Return the scale associated with the last set phase space point.
virtual void getDiagrams () const
 Add all possible diagrams with the add() function.
virtual Selector< DiagramIndexdiagrams (const DiagramVector &dv) const
 Get diagram selector.
virtual Selector< const
ColourLines * > 
colourGeometries (tcDiagPtr diag) const
 Return a Selector with possible colour geometries for the selected diagram weighted by their relative probabilities.
virtual void constructVertex (tSubProPtr)
 Construct the vertex of spin correlations.
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 ()
 The standard Init function used to initialize the interfaces.

Protected Member Functions

double qqbarME (vector< SpinorWaveFunction > &fin, vector< SpinorBarWaveFunction > &ain, vector< SpinorBarWaveFunction > &fout, vector< SpinorWaveFunction > &aout, bool me) const
 Matrix element for $q\bar{q}\to \gamma/Z \to f\bar{f}$.
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.

Private Member Functions

MEqq2gZ2ffoperator= (const MEqq2gZ2ff &)
 The assignment operator is private and must never be called.

Private Attributes

ProductionMatrixElement _me
 Matrix element for spin correlations.
AbstractFFVVertexPtr _theFFZVertex
 Pointer to the vertices for the helicity calculations.
AbstractFFVVertexPtr _theFFPVertex
 Pointer to the photon vertex.
tcPDPtr _z0
 Pointers to the intermediate resonances.
tcPDPtr _gamma
 Pointer to the photon ParticleData object.
int _minflavour
 Switches to control the particles in the hard process.
int _maxflavour
 Maximum allowed flavour for the incoming quarks.
unsigned int _gammaZ
 Whether to include both $Z^0$ and $\gamma$ or only one.
int _process
 Which processes to include.

Static Private Attributes

static ClassDescription
< MEqq2gZ2ff
initMEqq2gZ2ff
 The static object used to initialize the description of this class.

Detailed Description

The MEqq2gZ2ff class implements the products of Standard Model fermion antifermion pairs via the $Z^0$ resonance including photon interference terms.

See also:
The interfaces defined for MEqq2gZ2ff.

Definition at line 34 of file MEqq2gZ2ff.h.


Member Function Documentation

virtual IBPtr Herwig::MEqq2gZ2ff::clone ( ) const [inline, protected, virtual]

Make a simple clone of this object.

Returns:
a pointer to the new object.

Implements ThePEG::InterfacedBase.

Reimplemented in Herwig::MEqq2gZ2ffPowheg.

Definition at line 153 of file MEqq2gZ2ff.h.

virtual Selector<const ColourLines *> Herwig::MEqq2gZ2ff::colourGeometries ( tcDiagPtr  diag) const [virtual]

Return a Selector with possible colour geometries for the selected diagram weighted by their relative probabilities.

Parameters:
diagthe diagram chosen.
Returns:
the possible colour geometries weighted by their relative probabilities.

Implements ThePEG::MEBase.

virtual Selector<DiagramIndex> Herwig::MEqq2gZ2ff::diagrams ( const DiagramVector dv) const [virtual]

Get diagram selector.

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.

Parameters:
dvthe diagrams to be weighted.
Returns:
a Selector relating the given diagrams to their weights.

Reimplemented from ThePEG::MEBase.

virtual void Herwig::MEqq2gZ2ff::doinit ( ) [protected, virtual]

Initialize this object after the setup phase before saving an EventGenerator to disk.

Exceptions:
InitExceptionif object could not be initialized properly.

Reimplemented from Herwig::DrellYanBase.

Reimplemented in Herwig::MEqq2gZ2ffPowheg.

virtual IBPtr Herwig::MEqq2gZ2ff::fullclone ( ) const [inline, 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 Herwig::MEqq2gZ2ffPowheg.

Definition at line 159 of file MEqq2gZ2ff.h.

static void Herwig::MEqq2gZ2ff::Init ( ) [static]

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.

Reimplemented from Herwig::DrellYanBase.

Reimplemented in Herwig::MEqq2gZ2ffPowheg.

virtual double Herwig::MEqq2gZ2ff::me2 ( ) const [virtual]

The matrix element for the kinematical configuration previously provided by the last call to setKinematics(), suitably scaled by sHat() to give a dimension-less number.

Returns:
the matrix element scaled with sHat() to give a dimensionless number.

Implements ThePEG::MEBase.

MEqq2gZ2ff& Herwig::MEqq2gZ2ff::operator= ( const MEqq2gZ2ff ) [private]

The assignment operator is private and must never be called.

In fact, it should not even be implemented.

void Herwig::MEqq2gZ2ff::persistentInput ( PersistentIStream is,
int  version 
)

Function used to read in object persistently.

Parameters:
isthe persistent input stream read from.
versionthe version number of the object when written.

Reimplemented from Herwig::DrellYanBase.

Reimplemented in Herwig::MEqq2gZ2ffPowheg.

Function used to write out object persistently.

Parameters:
osthe persistent output stream written to.

Reimplemented from Herwig::DrellYanBase.

Reimplemented in Herwig::MEqq2gZ2ffPowheg.

double Herwig::MEqq2gZ2ff::qqbarME ( vector< SpinorWaveFunction > &  fin,
vector< SpinorBarWaveFunction > &  ain,
vector< SpinorBarWaveFunction > &  fout,
vector< SpinorWaveFunction > &  aout,
bool  me 
) const [protected]

Matrix element for $q\bar{q}\to \gamma/Z \to f\bar{f}$.

Parameters:
finSpinors for incoming quark
ainSpinors for incoming antiquark
foutSpinors for incoming quark
aoutSpinors for incoming antiquark
meWhether or not to calculate the matrix element for spin correlations

Member Data Documentation

Switches to control the particles in the hard process.

Minimum allowed flavour for the incoming quarks

Definition at line 227 of file MEqq2gZ2ff.h.

Pointer to the vertices for the helicity calculations.

Pointer to the Z vertex

Definition at line 197 of file MEqq2gZ2ff.h.

Pointers to the intermediate resonances.

Pointer to the Z ParticleData object

Definition at line 212 of file MEqq2gZ2ff.h.

The static object used to initialize the description of this class.

Indicates that this is a concrete class with persistent data.

Definition at line 180 of file MEqq2gZ2ff.h.


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