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Herwig++  2.7.0
Herwig::MENeutralCurrentDIS Class Reference

The MENeutralCurrentDIS class provides the matrix elements for neutral current DIS. More...

#include <MENeutralCurrentDIS.h>

Inheritance diagram for Herwig::MENeutralCurrentDIS:

List of all members.

Public Member Functions

 MENeutralCurrentDIS ()
 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 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 helicityME (vector< SpinorWaveFunction > &f1, vector< SpinorWaveFunction > &f2, vector< SpinorBarWaveFunction > &a1, vector< SpinorBarWaveFunction > &a2, bool lorder, bool qorder, bool me) const
 Matrix element for $\ell q\to \gamma/Z \to \ell q$.
unsigned int gammaZOption () const
 Option for treatment of $\gamma/Z$ terms.
virtual double A (tcPDPtr lin, tcPDPtr lout, tcPDPtr qin, tcPDPtr qout, Energy2 scale) const
 Calculate the coefficient A for the correlations in the hard radiation.
Standard Interfaced functions.
virtual void doinit ()
 Initialize this object after the setup phase before saving an EventGenerator to disk.
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

MENeutralCurrentDISoperator= (const MENeutralCurrentDIS &)
 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 flavour of the incoming quarks.
unsigned int _gammaZ
 Whether to include both $Z^0$ and $\gamma$ or only one.
double _sinW
 Electroweak parameters.
double _cosW
 $\cos\theta_W$
Energy2 _mz2
 The square of the Z mass.

Static Private Attributes

static ClassDescription
< MENeutralCurrentDIS
initMENeutralCurrentDIS
 The static object used to initialize the description of this class.

Detailed Description

The MENeutralCurrentDIS class provides the matrix elements for neutral current DIS.

For consistency both the incoming and outgoing quarks are assumed to be massless.

See also:
The interfaces defined for MENeutralCurrentDIS.

Definition at line 27 of file MENeutralCurrentDIS.h.


Member Function Documentation

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

Make a simple clone of this object.

Returns:
a pointer to the new object.

Implements ThePEG::InterfacedBase.

Definition at line 168 of file MENeutralCurrentDIS.h.

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.

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::MENeutralCurrentDIS::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::DISBase.

virtual IBPtr Herwig::MENeutralCurrentDIS::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.

Definition at line 174 of file MENeutralCurrentDIS.h.

double Herwig::MENeutralCurrentDIS::helicityME ( vector< SpinorWaveFunction > &  f1,
vector< SpinorWaveFunction > &  f2,
vector< SpinorBarWaveFunction > &  a1,
vector< SpinorBarWaveFunction > &  a2,
bool  lorder,
bool  qorder,
bool  me 
) const [protected]

Matrix element for $\ell q\to \gamma/Z \to \ell q$.

Parameters:
f1Fermion on lepton line
a1Anti-fermion on lepton line
f2Fermion on quark line
a2Anti-fermion on quark line
lorderThe order of particles on the lepton line
qorderThe order of particles on the quark line
meWhether or not to calculate the matrix element for spin correlations
static void Herwig::MENeutralCurrentDIS::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::DISBase.

virtual double Herwig::MENeutralCurrentDIS::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.

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

The assignment operator is private and must never be called.

In fact, it should not even be implemented.

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::DISBase.

Function used to write out object persistently.

Parameters:
osthe persistent output stream written to.

Reimplemented from Herwig::DISBase.


Member Data Documentation

Switches to control the particles in the hard process.

Minimumflavour of the incoming quarks

Definition at line 230 of file MENeutralCurrentDIS.h.

Electroweak parameters.

$\sin\theta_W$

Definition at line 255 of file MENeutralCurrentDIS.h.

Pointer to the vertices for the helicity calculations.

Pointer to the Z vertex

Definition at line 200 of file MENeutralCurrentDIS.h.

Pointers to the intermediate resonances.

Pointer to the Z ParticleData object

Definition at line 215 of file MENeutralCurrentDIS.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 183 of file MENeutralCurrentDIS.h.


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