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Herwig++  2.7.0
Herwig::MEfftoVH Class Reference

The MEfftoVH class is the base class for $f\bar{f}\to VH$ processes. More...

#include <MEfftoVH.h>

Inheritance diagram for Herwig::MEfftoVH:

List of all members.

Public Member Functions

 MEfftoVH ()
 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 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.
virtual int nDim () const
 The number of internal degrees of freedom used in the matrix element.
virtual bool generateKinematics (const double *r)
 Generate internal degrees of freedom given nDim() uniform random numbers in the interval $ ]0,1[ $.
virtual CrossSection dSigHatDR () const
 Return the matrix element squared differential in the variables given by the last call to generateKinematics().
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 helicityME (vector< SpinorWaveFunction > &fin, vector< SpinorBarWaveFunction > &ain, vector< SpinorBarWaveFunction > &fout, vector< SpinorWaveFunction > &aout, bool me) const
 Matrix element for $f\bar{f}\to V h^0\to f'\bar{f'} h^0$.
void setWWHVertex (AbstractVVSVertexPtr in)
 Set the pointer to the vector-vector-Higgs vertex.
void lineShape (unsigned int in)
 Set the line shape treatment.
unsigned int maxFlavour () const
 Maximum flavour of the incoming partons.
PDPtr WPlus () const
 Access to the vector ParticleData objects.
PDPtr WMinus () const
 Access to the $W^-$ data.
PDPtr Z0 () const
 Access to the $Z^0$ data.
PDPtr higgs () const
 Access to the higgs data.
void higgs (PDPtr in)
 Set the higgs data.
Standard Interfaced functions.
virtual void doinit ()
 Initialize this object after the setup phase before saving an EventGenerator to disk.

Private Member Functions

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

Private Attributes

unsigned int _shapeopt
 Defines the Higgs resonance shape.
unsigned int _maxflavour
 The allowed flavours of the incoming quarks.
Energy _mh
 On-shell mass for the higgs.
Energy _wh
 On-shell width for the higgs.
GenericMassGeneratorPtr _hmass
 The mass generator for the Higgs.
ProductionMatrixElement _me
 Matrix element for spin correlations.
PDPtr _wplus
 The intermediate vector bosons.
PDPtr _wminus
 $W^-$
PDPtr _z0
 $Z^0$
PDPtr _higgs
 The higgs bosom.
AbstractFFVVertexPtr _vertexFFW
 The vertices for the calculation of the matrix element.
AbstractFFVVertexPtr _vertexFFZ
 Vertex for fermion-fermion-Z.
AbstractVVSVertexPtr _vertexWWH
 Vertex for vector-vector-Higgs.

Static Private Attributes

static
AbstractClassDescription
< MEfftoVH
initMEfftoVH
 The static object used to initialize the description of this class.

Detailed Description

The MEfftoVH class is the base class for $f\bar{f}\to VH$ processes.

This base class handles the phase-space integration while the inheriting classes implement the matrix element

See also:
The interfaces defined for MEfftoVH.

Definition at line 25 of file MEfftoVH.h.


Member Function Documentation

virtual Selector<const ColourLines *> Herwig::MEfftoVH::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::MEfftoVH::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::MEfftoVH::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::MEPP2WHPowheg, Herwig::MEPP2ZHPowheg, Herwig::MEPP2WH, Herwig::MEPP2ZH, and Herwig::MEee2ZH.

virtual bool Herwig::MEfftoVH::generateKinematics ( const double *  r) [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.

Parameters:
ra pointer to the first of nDim() consecutive random numbers.
Returns:
true if the generation succeeded, otherwise false.

Reimplemented from Herwig::HwMEBase.

Reimplemented in Herwig::MEPP2WHPowheg, and Herwig::MEPP2ZHPowheg.

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

Matrix element for $f\bar{f}\to V h^0\to f'\bar{f'} h^0$.

Parameters:
finSpinors for incoming fermion
ainSpinors for incoming antifermion
foutSpinors for incoming fermion
aoutSpinors for incoming antifermion
meWhether or not to calculate the matrix element for spin correlations
static void Herwig::MEfftoVH::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::MEPP2WHPowheg, Herwig::MEPP2ZHPowheg, Herwig::GeneralfftoVH, Herwig::MEPP2WH, Herwig::MEPP2ZH, and Herwig::MEee2ZH.

virtual double Herwig::MEfftoVH::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.

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

The assignment operator is private and must never be called.

In fact, it should not even be implemented.

void Herwig::MEfftoVH::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::MEPP2WHPowheg, Herwig::MEPP2ZHPowheg, Herwig::GeneralfftoVH, Herwig::MEPP2WH, and Herwig::MEPP2ZH.

Function used to write out object persistently.

Parameters:
osthe persistent output stream written to.

Reimplemented from Herwig::DrellYanBase.

Reimplemented in Herwig::MEPP2WHPowheg, Herwig::MEPP2ZHPowheg, Herwig::GeneralfftoVH, Herwig::MEPP2WH, and Herwig::MEPP2ZH.

virtual void Herwig::MEfftoVH::setKinematics ( ) [virtual]

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 from Herwig::DrellYanBase.

PDPtr Herwig::MEfftoVH::WPlus ( ) const [inline, protected]

Access to the vector ParticleData objects.

Access to the $W^+$ data

Definition at line 169 of file MEfftoVH.h.


Member Data Documentation

The vertices for the calculation of the matrix element.

Vertex for fermion-fermion-W

Definition at line 279 of file MEfftoVH.h.

The intermediate vector bosons.

$W^+$

Definition at line 254 of file MEfftoVH.h.

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

Indicates that this is an abstract class with persistent data.

Definition at line 227 of file MEfftoVH.h.


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