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Herwig++  2.7.0
Herwig::METRP2to2 Class Reference

The METRP2to2 class implements the matrix elements for Transplanckian $2\to2$ scattering process. More...

#include <METRP2to2.h>

Inheritance diagram for Herwig::METRP2to2:

List of all members.

Public Member Functions

 METRP2to2 ()
 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 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 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.
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

void setup_interpolator ()
 Setup the interpolator.
Standard Interfaced functions.
virtual void doinit ()
 Initialize this object after the setup phase before saving an EventGenerator to disk.
virtual void rebind (const TranslationMap &trans)
 Rebind pointer to other Interfaced objects.
virtual IVector getReferences ()
 Return a vector of all pointers to Interfaced objects used in this object.
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.
Helper functions for me2.
InvEnergy bccalc (Energy2 s) const
 The function which calculates b_c according to hep-ph/0112161, eq.
double A_ny (Energy2 s, Energy2 t) const
 A_ny calculates part of the matrix element squared (divided by 16 * pi^2) according to hep-ph/0112161.
double fpoint (double x) const
 fpoint initializes the matrix of pre-calculated points for the functions F_n(y) (hep-ph/0112161, eq.
double fnyasympt (double y) const
 The asymptotic form of the F_n(y) functions, used for y>20, according to hep-ph/0112161, eq.

Private Member Functions

METRP2to2operator= (const METRP2to2 &)
 The assignment operator is private and must never be called.

Private Attributes

Interpolator< double, double >::Ptr _interpol
 Interpolator.
unsigned int _maxflavour
 Maximum number of quark flavours to include.
unsigned int _ndim
 Number of Extra dimensions (>=2)
Energy _planckmass
 The Extra-dimensional Planck mass.
unsigned int _process
 Processes to include.

Detailed Description

The METRP2to2 class implements the matrix elements for Transplanckian $2\to2$ scattering process.

Definition at line 28 of file METRP2to2.h.


Member Function Documentation

double Herwig::METRP2to2::A_ny ( Energy2  s,
Energy2  t 
) const [protected]

A_ny calculates part of the matrix element squared (divided by 16 * pi^2) according to hep-ph/0112161.

eq.(19)

InvEnergy Herwig::METRP2to2::bccalc ( Energy2  s) const [protected]

The function which calculates b_c according to hep-ph/0112161, eq.

(18)

virtual IBPtr Herwig::METRP2to2::clone ( ) const [protected, virtual]

Make a simple clone of this object.

Returns:
a pointer to the new object.

Implements ThePEG::InterfacedBase.

virtual Selector<const ColourLines *> Herwig::METRP2to2::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::METRP2to2::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::METRP2to2::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 ThePEG::InterfacedBase.

double Herwig::METRP2to2::fnyasympt ( double  y) const [protected]

The asymptotic form of the F_n(y) functions, used for y>20, according to hep-ph/0112161, eq.

(25)

double Herwig::METRP2to2::fpoint ( double  x) const [protected]

fpoint initializes the matrix of pre-calculated points for the functions F_n(y) (hep-ph/0112161, eq.

(20)

virtual IBPtr Herwig::METRP2to2::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 IVector Herwig::METRP2to2::getReferences ( ) [protected, virtual]

Return a vector of all pointers to Interfaced objects used in this object.

Returns:
a vector of pointers.

Reimplemented from ThePEG::InterfacedBase.

static void Herwig::METRP2to2::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::HwMEBase.

virtual double Herwig::METRP2to2::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.

METRP2to2& Herwig::METRP2to2::operator= ( const METRP2to2 ) [private]

The assignment operator is private and must never be called.

In fact, it should not even be implemented.

void Herwig::METRP2to2::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::HwMEBase.

Function used to write out object persistently.

Parameters:
osthe persistent output stream written to.

Reimplemented from Herwig::HwMEBase.

virtual void Herwig::METRP2to2::rebind ( const TranslationMap trans) [protected, virtual]

Rebind pointer to other Interfaced objects.

Called in the setup phase after all objects used in an EventGenerator has been cloned so that the pointers will refer to the cloned objects afterwards.

Parameters:
transa TranslationMap relating the original objects to their respective clones.
Exceptions:
RebindExceptionif no cloned object was found for a given pointer.

Reimplemented from ThePEG::InterfacedBase.


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