Herwig++
2.7.0
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The MEee2gZ2qq class implements the matrix element for including spin correlations.
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#include <MEee2gZ2qq.h>
Public Member Functions | |
MEee2gZ2qq () | |
The default constructor. | |
virtual POWHEGType | hasPOWHEGCorrection () |
Members for hard corrections to the emission of QCD radiation. | |
virtual bool | hasMECorrection () |
Has an old fashioned ME correction. | |
virtual void | initializeMECorrection (ShowerTreePtr, double &, double &) |
Initialize the ME correction. | |
virtual void | applyHardMatrixElementCorrection (ShowerTreePtr) |
Apply the hard matrix element correction to a given hard process or decay. | |
virtual bool | softMatrixElementVeto (ShowerProgenitorPtr initial, ShowerParticlePtr parent, Branching br) |
Apply the soft matrix element correction. | |
virtual HardTreePtr | generateHardest (ShowerTreePtr) |
Apply the POWHEG style correction. | |
Virtual functions required by the MEBase class. | |
virtual unsigned int | orderInAlphaS () const |
Return the order in ![]() | |
virtual unsigned int | orderInAlphaEW () const |
Return the order in ![]() | |
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< DiagramIndex > | diagrams (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 | loME (const vector< cPDPtr > &partons, const vector< Lorentz5Momentum > &momenta, bool first) const |
Calculate the matrix element for ![]() | |
ProductionMatrixElement | HelicityME (vector< SpinorWaveFunction > &fin, vector< SpinorBarWaveFunction > &ain, vector< SpinorBarWaveFunction > &fout, vector< SpinorWaveFunction > &aout, double &me, double &cont, double &BW) const |
Member to calculate the matrix element. | |
double | meRatio (vector< cPDPtr > partons, vector< Lorentz5Momentum > momenta, unsigned int iemitter, bool subtract=false) const |
The ratio of the matrix element for one additional jet over the leading order result. | |
InvEnergy2 | realME (const vector< cPDPtr > &partons, const vector< Lorentz5Momentum > &momenta) const |
Calculate the matrix element for ![]() | |
AbstractFFVVertexPtr | FFZVertex () const |
Pointer to the fermion-antifermion Z vertex. | |
AbstractFFVVertexPtr | FFPVertex () const |
Pointer to the fermion-antifermion photon vertex. | |
PDPtr | Z0 () const |
Pointer to the particle data object for the Z. | |
PDPtr | gamma () const |
Pointer to the particle data object for the photon. | |
PDPtr | gluon () const |
Pointer to the particle data object for the gluon. | |
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. | |
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. | |
Private Member Functions | |
vector< Lorentz5Momentum > | applyHard (const ParticleVector &p) |
Apply the hard matrix element. | |
double | getHard (double &, double &) |
Get the weight for hard emission. | |
void | setRho (double) |
Set the ![]() | |
void | setKtildeSymm () |
Set the ![]() | |
void | setKtilde2 () |
Set second ![]() | |
void | getXXbar (double kt, double z, double &x, double &xbar) |
Calculate ![]() ![]() | |
double | u (double) |
???? | |
MEee2gZ2qq & | operator= (const MEee2gZ2qq &) |
The assignment operator is private and must never be called. | |
double | getZfromX (double, double) |
Translate the variables from ![]() ![]() | |
double | getKfromX (double, double) |
Calculate ![]() | |
double | qWeight (double x, double xbar) |
Soft weight. | |
double | qbarWeight (double x, double xbar) |
Soft antiquark weight calculated from ![]() | |
double | qWeightX (Energy qtilde, double z) |
Soft quark weight calculated from ![]() | |
double | qbarWeightX (Energy qtilde, double z) |
Soft antiquark weight calculated from ![]() | |
double | MEV (double, double) |
Vector and axial vector parts of the matrix element. | |
double | MEA (double, double) |
Axial vector part of the matrix element. | |
double | PS (double x1, double x2) |
The matrix element, given ![]() ![]() | |
Private Attributes | |
AbstractFFVVertexPtr | FFZVertex_ |
Pointer to the fermion-antifermion Z vertex. | |
AbstractFFVVertexPtr | FFPVertex_ |
Pointer to the fermion-antifermion photon vertex. | |
AbstractFFVVertexPtr | FFGVertex_ |
Pointer to the fermion-antifermion photon vertex. | |
PDPtr | Z0_ |
Pointer to the particle data object for the Z. | |
PDPtr | gamma_ |
Pointer to the particle data object for the photon. | |
PDPtr | gluon_ |
Pointer to the particle data object for the gluon. | |
int | minflav_ |
The minimum PDG of the quarks to be produced. | |
int | maxflav_ |
The maximum PDG of the quarks to be produced. | |
unsigned int | massopt_ |
Option for the treatment of the top quark mass. | |
Energy | d_Q_ |
CM energy. | |
Energy | d_m_ |
Quark mass. | |
double | d_rho_ |
The rho parameter. | |
double | d_v_ |
The v parameter. | |
double | d_kt1_ |
The initial kappa-tilde values for radiation from the quark. | |
double | d_kt2_ |
The initial kappa-tilde values for radiation from the antiquark. | |
ShowerAlphaPtr | alpha_ |
Pointer to the coupling. | |
Energy | pTmin_ |
Variables for the POWHEG style corrections. | |
double | preFactor_ |
Overestimate for the prefactor. | |
vector< cPDPtr > | partons_ |
ParticleData objects for the partons. | |
vector< Lorentz5Momentum > | loMomenta_ |
Momenta of the leading-order partons. | |
Static Private Attributes | |
static ClassDescription < MEee2gZ2qq > | initMEee2gZ2qq |
The static object used to initialize the description of this class. | |
static const double | EPS_ |
Cut-off parameter. |
The MEee2gZ2qq class implements the matrix element for including spin correlations.
The class includes greater control over the type of quark produced than is available in the corresponding matrix element from ThePEG, in addition to spin correlations.
Definition at line 38 of file MEee2gZ2qq.h.
virtual IBPtr Herwig::MEee2gZ2qq::clone | ( | ) | const [inline, protected, virtual] |
Make a simple clone of this object.
Implements ThePEG::InterfacedBase.
Definition at line 186 of file MEee2gZ2qq.h.
virtual Selector<const ColourLines *> Herwig::MEee2gZ2qq::colourGeometries | ( | tcDiagPtr | diag | ) | const [virtual] |
Return a Selector with possible colour geometries for the selected diagram weighted by their relative probabilities.
diag | the diagram chosen. |
Implements ThePEG::MEBase.
virtual Selector<DiagramIndex> Herwig::MEee2gZ2qq::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.
dv | the diagrams to be weighted. |
Reimplemented from ThePEG::MEBase.
virtual void Herwig::MEee2gZ2qq::doinit | ( | ) | [protected, virtual] |
Initialize this object after the setup phase before saving an EventGenerator to disk.
InitException | if object could not be initialized properly. |
Reimplemented from ThePEG::InterfacedBase.
virtual IBPtr Herwig::MEee2gZ2qq::fullclone | ( | ) | const [inline, protected, virtual] |
Make a clone of this object, possibly modifying the cloned object to make it sane.
Reimplemented from ThePEG::InterfacedBase.
Definition at line 192 of file MEee2gZ2qq.h.
virtual IVector Herwig::MEee2gZ2qq::getReferences | ( | ) | [protected, virtual] |
Return a vector of all pointers to Interfaced objects used in this object.
Reimplemented from ThePEG::InterfacedBase.
void Herwig::MEee2gZ2qq::getXXbar | ( | double | kt, |
double | z, | ||
double & | x, | ||
double & | xbar | ||
) | [private] |
Calculate from
.
kt | ![]() |
z | ![]() |
x | ![]() |
xbar | ![]() |
double Herwig::MEee2gZ2qq::getZfromX | ( | double | , |
double | |||
) | [private] |
Translate the variables from to
.
Calculate .
virtual POWHEGType Herwig::MEee2gZ2qq::hasPOWHEGCorrection | ( | ) | [inline, virtual] |
Members for hard corrections to the emission of QCD radiation.
Has a POWHEG style correction
Reimplemented from Herwig::HwMEBase.
Definition at line 56 of file MEee2gZ2qq.h.
ProductionMatrixElement Herwig::MEee2gZ2qq::HelicityME | ( | vector< SpinorWaveFunction > & | fin, |
vector< SpinorBarWaveFunction > & | ain, | ||
vector< SpinorBarWaveFunction > & | fout, | ||
vector< SpinorWaveFunction > & | aout, | ||
double & | me, | ||
double & | cont, | ||
double & | BW | ||
) | const [protected] |
Member to calculate the matrix element.
fin | Spinors for incoming fermion |
ain | Spinors for incoming antifermion |
fout | Spinors for outgoing fermion |
aout | Spinors for outgong antifermion |
me | Spin summed Matrix element |
cont | The continuum piece of the matrix element |
BW | The Z piece of the matrix element |
static void Herwig::MEee2gZ2qq::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.
double Herwig::MEee2gZ2qq::loME | ( | const vector< cPDPtr > & | partons, |
const vector< Lorentz5Momentum > & | momenta, | ||
bool | first | ||
) | const [protected] |
Calculate the matrix element for .
partons | The incoming and outgoing particles |
momenta | The momenta of the incoming and outgoing particles |
first | Whether or not to calculate the spin correlations |
virtual double Herwig::MEee2gZ2qq::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.
Implements ThePEG::MEBase.
double Herwig::MEee2gZ2qq::meRatio | ( | vector< cPDPtr > | partons, |
vector< Lorentz5Momentum > | momenta, | ||
unsigned int | iemitter, | ||
bool | subtract = false |
||
) | const [protected] |
The ratio of the matrix element for one additional jet over the leading order result.
In practice
is returned where is the spin and colour summed/averaged matrix element.
partons | The incoming and outgoing particles |
momenta | The momenta of the incoming and outgoing particles |
iemitter | Whether the quark or antiquark is regardede as the emitter |
subtract | Whether or not to subtract the relevant dipole term |
double Herwig::MEee2gZ2qq::MEV | ( | double | , |
double | |||
) | [private] |
Vector and axial vector parts of the matrix element.
Vector part of the matrix element
MEee2gZ2qq& Herwig::MEee2gZ2qq::operator= | ( | const MEee2gZ2qq & | ) | [private] |
The assignment operator is private and must never be called.
In fact, it should not even be implemented.
void Herwig::MEee2gZ2qq::persistentInput | ( | PersistentIStream & | is, |
int | version | ||
) |
Function used to read in object persistently.
is | the persistent input stream read from. |
version | the version number of the object when written. |
Reimplemented from Herwig::HwMEBase.
void Herwig::MEee2gZ2qq::persistentOutput | ( | PersistentOStream & | os | ) | const |
Function used to write out object persistently.
os | the persistent output stream written to. |
Reimplemented from Herwig::HwMEBase.
double Herwig::MEee2gZ2qq::PS | ( | double | x1, |
double | x2 | ||
) | [private] |
The matrix element, given ,
.
x1 | ![]() |
x2 | ![]() |
double Herwig::MEee2gZ2qq::qbarWeight | ( | double | x, |
double | xbar | ||
) | [private] |
Soft antiquark weight calculated from .
x | ![]() |
xbar | ![]() |
double Herwig::MEee2gZ2qq::qbarWeightX | ( | Energy | qtilde, |
double | z | ||
) | [private] |
Soft antiquark weight calculated from .
qtilde | ![]() |
z | ![]() |
double Herwig::MEee2gZ2qq::qWeight | ( | double | x, |
double | xbar | ||
) | [private] |
Soft weight.
Soft quark weight calculated from
x | ![]() |
xbar | ![]() |
double Herwig::MEee2gZ2qq::qWeightX | ( | Energy | qtilde, |
double | z | ||
) | [private] |
Soft quark weight calculated from .
qtilde | ![]() |
z | ![]() |
InvEnergy2 Herwig::MEee2gZ2qq::realME | ( | const vector< cPDPtr > & | partons, |
const vector< Lorentz5Momentum > & | momenta | ||
) | const [protected] |
Calculate the matrix element for .
partons | The incoming and outgoing particles |
momenta | The momenta of the incoming and outgoing particles |
virtual void Herwig::MEee2gZ2qq::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.
trans | a TranslationMap relating the original objects to their respective clones. |
RebindException | if no cloned object was found for a given pointer. |
Reimplemented from ThePEG::InterfacedBase.
virtual bool Herwig::MEee2gZ2qq::softMatrixElementVeto | ( | ShowerProgenitorPtr | initial, |
ShowerParticlePtr | parent, | ||
Branching | br | ||
) | [virtual] |
Apply the soft matrix element correction.
initial | The particle from the hard process which started the shower |
parent | The initial particle in the current branching |
br | The branching struct |
Reimplemented from Herwig::HwMEBase.
ClassDescription<MEee2gZ2qq> Herwig::MEee2gZ2qq::initMEee2gZ2qq [static, private] |
The static object used to initialize the description of this class.
Indicates that this is a concrete class with persistent data.
Definition at line 424 of file MEee2gZ2qq.h.
Energy Herwig::MEee2gZ2qq::pTmin_ [private] |
Variables for the POWHEG style corrections.
The cut off on pt, assuming massless quarks.
Definition at line 528 of file MEee2gZ2qq.h.