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Herwig  7.1.4

The MEee2gZ2qq class implements the matrix element for $e^+e^-\to Z/\gamma \to q\bar{q}$ including spin correlations. More...

#include <MEee2gZ2qq.h>

Inheritance diagram for Herwig::MEee2gZ2qq:

Public Member Functions

 MEee2gZ2qq ()
 The default constructor.
 
virtual POWHEGType hasPOWHEGCorrection ()
 Members for hard corrections to the emission of QCD radiation. More...
 
virtual bool hasMECorrection ()
 Has an old fashioned ME correction.
 
virtual void initializeMECorrection (RealEmissionProcessPtr, double &, double &)
 Initialize the ME correction.
 
virtual RealEmissionProcessPtr applyHardMatrixElementCorrection (RealEmissionProcessPtr)
 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. More...
 
virtual RealEmissionProcessPtr generateHardest (RealEmissionProcessPtr, ShowerInteraction)
 Apply the POWHEG style correction.
 
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. More...
 
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. More...
 
virtual Selector< const ColourLines * > colourGeometries (tcDiagPtr diag) const
 Return a Selector with possible colour geometries for the selected diagram weighted by their relative probabilities. More...
 
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. More...
 
void persistentInput (PersistentIStream &is, int version)
 Function used to read in object persistently. More...
 
- Public Member Functions inherited from Herwig::HwMEBase
 HwMEBase ()
 Default constructor.
 
virtual int nDim () const
 The number of internal degreed 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[. More...
 
virtual CrossSection dSigHatDR () const
 Return the matrix element for the kinematical configuation previously provided by the last call to setKinematics(). More...
 
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.
 
void persistentOutput (PersistentOStream &os) const
 Function used to write out object persistently. More...
 
void persistentInput (PersistentIStream &is, int version)
 Function used to read in object persistently. More...
 
- Public Member Functions inherited from ThePEG::MEBase
virtual double alphaS () const
 
virtual double alphaEM () const
 
void setKinematics (tPPair in, const PVector &out)
 
virtual void constructVertex (tSubProPtr sub, const ColourLines *cl)
 
virtual bool wantCMS () const
 
virtual bool headCuts () const
 
virtual bool ignoreCuts () const
 
virtual bool apply () const
 
virtual bool haveX1X2 () const
 
virtual bool havePDFWeight1 () const
 
virtual bool havePDFWeight2 () const
 
virtual bool keepRandomNumbers () const
 
virtual void generateSubCollision (SubProcess &)
 
virtual void clearKinematics ()
 
virtual bool noMirror () const
 
const DiagramVectordiagrams () const
 
virtual const ColourLinesselectColourGeometry (tcDiagPtr diag) const
 
virtual DiagramIndex diagram (const DiagramVector &) const
 
bool reweighted () const
 
double reWeight () const
 
double preWeight () const
 
void addReweighter (tReweightPtr rw)
 
void addPreweighter (tReweightPtr rw)
 
Ptr< Amplitude >::pointer amplitude () const
 
void amplitude (Ptr< Amplitude >::pointer amp)
 
Energy2 sHat () const
 
double preweight () const
 
virtual void flushCaches ()
 
virtual StdXCombPtr makeXComb (Energy newMaxEnergy, const cPDPair &inc, tEHPtr newEventHandler, tSubHdlPtr newSubProcessHandler, tPExtrPtr newExtractor, tCascHdlPtr newCKKW, const PBPair &newPartonBins, tCutsPtr newCuts, const DiagramVector &newDiagrams, bool mir, const PartonPairVec &allPBins, tStdXCombPtr newHead=tStdXCombPtr(), tMEPtr newME=tMEPtr())
 
virtual StdXCombPtr makeXComb (tStdXCombPtr newHead, const PBPair &newPartonBins, const DiagramVector &newDiagrams, tMEPtr newME=tMEPtr())
 
virtual void fillProjectors ()
 
virtual void setXComb (tStdXCombPtr)
 
const DVectormeInfo () const
 
void meInfo (const DVector &info) const
 
virtual int maxMultCKKW () const
 
virtual int minMultCKKW () const
 
virtual void maxMultCKKW (int mult)
 
virtual void minMultCKKW (int mult)
 
virtual void setVetoScales (tSubProPtr) const
 
void persistentOutput (PersistentOStream &os) const
 
void persistentInput (PersistentIStream &is, int version)
 
virtual double alphaS () const
 
virtual double alphaEM () const
 
void setKinematics (tPPair in, const PVector &out)
 
virtual void constructVertex (tSubProPtr sub, const ColourLines *cl)
 
virtual bool wantCMS () const
 
virtual bool headCuts () const
 
virtual bool ignoreCuts () const
 
virtual bool apply () const
 
virtual bool haveX1X2 () const
 
virtual bool havePDFWeight1 () const
 
virtual bool havePDFWeight2 () const
 
virtual bool keepRandomNumbers () const
 
virtual void generateSubCollision (SubProcess &)
 
virtual void clearKinematics ()
 
virtual bool noMirror () const
 
const DiagramVectordiagrams () const
 
virtual const ColourLinesselectColourGeometry (tcDiagPtr diag) const
 
virtual DiagramIndex diagram (const DiagramVector &) const
 
bool reweighted () const
 
double reWeight () const
 
double preWeight () const
 
void addReweighter (tReweightPtr rw)
 
void addPreweighter (tReweightPtr rw)
 
Ptr< Amplitude >::pointer amplitude () const
 
void amplitude (Ptr< Amplitude >::pointer amp)
 
Energy2 sHat () const
 
double preweight () const
 
virtual void flushCaches ()
 
virtual StdXCombPtr makeXComb (Energy newMaxEnergy, const cPDPair &inc, tEHPtr newEventHandler, tSubHdlPtr newSubProcessHandler, tPExtrPtr newExtractor, tCascHdlPtr newCKKW, const PBPair &newPartonBins, tCutsPtr newCuts, const DiagramVector &newDiagrams, bool mir, const PartonPairVec &allPBins, tStdXCombPtr newHead=tStdXCombPtr(), tMEPtr newME=tMEPtr())
 
virtual StdXCombPtr makeXComb (tStdXCombPtr newHead, const PBPair &newPartonBins, const DiagramVector &newDiagrams, tMEPtr newME=tMEPtr())
 
virtual void fillProjectors ()
 
virtual void setXComb (tStdXCombPtr)
 
const DVectormeInfo () const
 
void meInfo (const DVector &info) const
 
virtual int maxMultCKKW () const
 
virtual int minMultCKKW () const
 
virtual void maxMultCKKW (int mult)
 
virtual void minMultCKKW (int mult)
 
virtual void setVetoScales (tSubProPtr) const
 
void persistentOutput (PersistentOStream &os) const
 
void persistentInput (PersistentIStream &is, int version)
 
- Public Member Functions inherited from HandlerBaseT< UseRandom >
double rnd () const
 
double rnd (double xu) const
 
double rnd (double xl, double xu) const
 
bool rndbool () const
 
bool rndbool (double p) const
 
bool rndbool (double p1, double p2) const
 
int rndsign (double p1, double p2, double p3) const
 
int rnd2 (double p0, double p1) const
 
int rnd3 (double p0, double p1, double p2) const
 
int rnd4 (double p0, double p1, double p2, double p3) const
 
long irnd (long xu=2) const
 
long irnd (long xl, long xu) const
 
const StandardModelBase & SM () const
 
tSMPtr standardModel () const
 
- Public Member Functions inherited from ThePEG::Interfaced
virtual bool defaultInit ()
 
PPtr getParticle (PID) const
 
PDPtr getParticleData (PID) const
 
bool used () const
 
void useMe () const
 
tEGPtr generator () const
 
void persistentOutput (PersistentOStream &os) const
 
void persistentInput (PersistentIStream &is, int version)
 
PPtr getParticle (PID) const
 
PDPtr getParticleData (PID) const
 
bool used () const
 
void useMe () const
 
tEGPtr generator () const
 
void persistentOutput (PersistentOStream &os) const
 
void persistentInput (PersistentIStream &is, int version)
 
- Public Member Functions inherited from ThePEG::InterfacedBase
string fullName () const
 
string name () const
 
string path () const
 
string comment () const
 
void setup (istream &is)
 
virtual void debugme () const
 
void update ()
 
void init ()
 
virtual bool preInitialize () const
 
void initrun ()
 
void finish ()
 
void touch ()
 
void reset ()
 
void clear ()
 
InitState state () const
 
bool locked () const
 
bool touched () const
 
void persistentOutput (PersistentOStream &os) const
 
void persistentInput (PersistentIStream &is, int version)
 
void update ()
 
void init ()
 
virtual bool preInitialize () const
 
void initrun ()
 
void finish ()
 
void touch ()
 
void reset ()
 
void clear ()
 
InitState state () const
 
bool locked () const
 
bool touched () const
 
void persistentOutput (PersistentOStream &os) const
 
void persistentInput (PersistentIStream &is, int version)
 
- Public Member Functions inherited from ThePEG::Base
void debug () const
 
- Public Member Functions inherited from ThePEG::Pointer::ReferenceCounted
CounterType referenceCount () const
 
- Public Member Functions inherited from ThePEG::Named
 Named (const string &newName=string())
 
const string & name () const
 
bool operator== (const Named &other) const
 
bool operator< (const Named &other) const
 
- Public Member Functions inherited from ThePEG::LastXCombInfo< StandardXComb >
const StandardXComblastXComb () const
 
const StandardXComblastXComb () const
 
tXCPtr lastXCombPtr () const
 
tXCPtr lastXCombPtr () const
 
const StandardXComblastHeadXComb () const
 
const StandardXComblastHeadXComb () const
 
tXCPtr lastHeadXCombPtr () const
 
tXCPtr lastHeadXCombPtr () const
 
const EventHandlerlastEventHandler () const
 
const EventHandlerlastEventHandler () const
 
tPExtrPtr lastExtractor () const
 
tPExtrPtr lastExtractor () const
 
PDFT pdf (tcPPtr parton) const
 
PDFT pdf (tcPPtr parton) const
 
const CutslastCuts () const
 
const CutslastCuts () const
 
tCutsPtr lastCutsPtr () const
 
tCutsPtr lastCutsPtr () const
 
const PPairlastParticles () const
 
const PPairlastParticles () const
 
Energy2 lastS () const
 
Energy2 lastS () const
 
const PPairlastPartons () const
 
const PPairlastPartons () const
 
Energy2 lastSHat () const
 
Energy2 lastSHat () const
 
double lastTau () const
 
double lastTau () const
 
double lastY () const
 
double lastY () const
 
double lastP1 () const
 
double lastP1 () const
 
double lastP2 () const
 
double lastP2 () const
 
double lastL1 () const
 
double lastL1 () const
 
double lastL2 () const
 
double lastL2 () const
 
double lastX1 () const
 
double lastX1 () const
 
double lastX2 () const
 
double lastX2 () const
 
double lastE1 () const
 
double lastE1 () const
 
double lastE2 () const
 
double lastE2 () const
 
double lastFL1L2 () const
 
double lastFL1L2 () const
 
Energy2 lastScale () const
 
Energy2 lastScale () const
 
double lastAlphaS () const
 
double lastAlphaS () const
 
double lastAlphaEM () const
 
double lastAlphaEM () const
 
const vector< Lorentz5Momentum > & meMomenta () const
 
const vector< Lorentz5Momentum > & meMomenta () const
 
double lastME2 () const
 
double lastME2 () const
 
double lastPreweight () const
 
double lastPreweight () const
 
double jacobian () const
 
double jacobian () const
 
CrossSection lastMECrossSection () const
 
CrossSection lastMECrossSection () const
 
double lastMEPDFWeight () const
 
double lastMEPDFWeight () const
 
double lastMECouplings () const
 
double lastMECouplings () const
 
tSubProPtr subProcess () const
 
tSubProPtr subProcess () const
 
const cPDVectormePartonData () const
 
const cPDVectormePartonData () const
 

Static Public Member Functions

static void Init ()
 The standard Init function used to initialize the interfaces. More...
 
- Static Public Member Functions inherited from Herwig::HwMEBase
static void Init ()
 The standard Init function used to initialize the interfaces. More...
 
- Static Public Member Functions inherited from ThePEG::MEBase
static void Init ()
 
- Static Public Member Functions inherited from ThePEG::HandlerBase
static void Init ()
 
- Static Public Member Functions inherited from ThePEG::Interfaced
static void Init ()
 
- Static Public Member Functions inherited from ThePEG::InterfacedBase
static void Init ()
 
- Static Public Member Functions inherited from ThePEG::Base
static void Init ()
 

Protected Member Functions

double loME (const vector< cPDPtr > &partons, const vector< Lorentz5Momentum > &momenta, bool first) const
 Calculate the matrix element for $e^+e^-\to q \bar{q}$. More...
 
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. More...
 
double meRatio (vector< cPDPtr > partons, vector< Lorentz5Momentum > momenta, unsigned int iemitter, ShowerInteraction inter, bool subtract=false) const
 The ratio of the matrix element for one additional jet over the leading order result. More...
 
InvEnergy2 realME (const vector< cPDPtr > &partons, const vector< Lorentz5Momentum > &momenta, ShowerInteraction inter) const
 Calculate the matrix element for $e^-e^-\to q \bar q g$. More...
 
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. More...
 
virtual IBPtr fullclone () const
 Make a clone of this object, possibly modifying the cloned object to make it sane. More...
 
Standard Interfaced functions.
virtual void doinit ()
 Initialize this object after the setup phase before saving an EventGenerator to disk. More...
 
virtual void rebind (const TranslationMap &trans)
 Rebind pointer to other Interfaced objects. More...
 
virtual IVector getReferences ()
 Return a vector of all pointers to Interfaced objects used in this object. More...
 
- Protected Member Functions inherited from Herwig::HwMEBase
void massOption (vector< unsigned int > iopt)
 Set the treatment of the outgoing masses. More...
 
bool generateMasses (vector< Energy > &masses, double &mjac, const double *r)
 Generate the masses of the particles.
 
virtual double getCosTheta (double cthmin, double cthmax, const double r)
 Used internally by generateKinematics, after calculating the limits on cos(theta).
 
Energy2 tHat () const
 Return the $\hat{t}$ of the last set phase space point.
 
Energy2 uHat () const
 Return the $\hat{u}$ of the last set phase space point.
 
double phi () const
 Return the azimuth angle of the last set phase space point.
 
void tHat (Energy2 e2)
 Set the $\hat{t}$ of the last set phase space point.
 
void uHat (Energy2 e2)
 Set the $\hat{u}$ of the last set phase space point.
 
void phi (double phi)
 Set the azimuth angle of the last set phase space point.
 
void rescalingOption (unsigned int iopt)
 Rescaled momenta for the helicity ME. More...
 
bool rescaleMomenta (const vector< Lorentz5Momentum > &, const cPDVector &)
 rescale the momenta for the computation of the helicity matrix element
 
const vector< Lorentz5Momentum > & rescaledMomenta () const
 Access to the rescaled momenta.
 
- Protected Member Functions inherited from ThePEG::MEBase
void add (DiagPtr dp) const
 
vector< Lorentz5Momentum > & meMomenta ()
 
void lastME2 (double v) const
 
void lastPreweight (double w) const
 
void lastMECrossSection (CrossSection v) const
 
void lastMEPDFWeight (double v) const
 
void lastMECouplings (double v) const
 
void jacobian (double j)
 
void use (tcMEPtr other)
 
void useDiagrams (tcMEPtr other) const
 
virtual void doinitrun ()
 
virtual void doinitrun ()
 
- Protected Member Functions inherited from ThePEG::Interfaced
void reporeg (IBPtr object, string name) const
 
bool setDefaultReference (PtrT &ptr, string classname, string objectname)
 
 Interfaced (const string &newName)
 
 Interfaced (const Interfaced &i)
 
void setGenerator (tEGPtr generator)
 
- Protected Member Functions inherited from ThePEG::InterfacedBase
 InterfacedBase (string newName)
 
 InterfacedBase (const InterfacedBase &i)
 
virtual void readSetup (istream &is)
 
virtual void doupdate ()
 
virtual void dofinish ()
 
virtual void readSetup (istream &is)
 
virtual void doupdate ()
 
virtual void dofinish ()
 
- Protected Member Functions inherited from ThePEG::Pointer::ReferenceCounted
 ReferenceCounted (const ReferenceCounted &)
 
ReferenceCountedoperator= (const ReferenceCounted &)
 
 ReferenceCounted (const ReferenceCounted &)
 
ReferenceCountedoperator= (const ReferenceCounted &)
 
- Protected Member Functions inherited from ThePEG::Named
const Namedoperator= (const Named &other)
 
const string & name (const string &newName)
 

Private Member Functions

pair< Energy, ShowerInteractiongenerateHard (RealEmissionProcessPtr, vector< Lorentz5Momentum > &emission, unsigned int &iemit, unsigned int &ispect, bool applyVeto, ShowerInteraction)
 Generate the momenta for a hard configuration.
 
RealEmissionProcessPtr calculateRealEmission (RealEmissionProcessPtr born, bool veto, ShowerInteraction inter)
 Calculate the reall emission.
 
double getKfromX (double, double)
 Calculate $\tilde{\kappa}$.
 
MEee2gZ2qqoperator= (const MEee2gZ2qq &)
 The assignment operator is private and must never be called. More...
 
double MEV (double, double)
 Vector and axial vector parts of the matrix element. More...
 
double PS (double x1, double x2)
 The matrix element, given $x_1$, $x_2$. More...
 

Private Attributes

bool spinCorrelations_
 Switch on/off the helivity vertex construction.
 
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 alphaQCD_
 Pointer to the strong coupling.
 
ShowerAlphaPtr alphaQED_
 Pointer to the EM coupling.
 
int minflav_
 Parameters controlling the leading-order process. More...
 
int maxflav_
 The maximum PDG of the quarks to be produced.
 
unsigned int massopt_
 Option for the treatment of the top quark mass.
 
AbstractFFVVertexPtr FFZVertex_
 Pointers to the vertices. More...
 
AbstractFFVVertexPtr FFPVertex_
 Pointer to the fermion-antifermion photon vertex.
 
AbstractFFVVertexPtr FFGVertex_
 Pointer to the fermion-antifermion photon vertex.
 
PDPtr Z0_
 Pointer to the ParticleData objects. More...
 
PDPtr gamma_
 Pointer to the particle data object for the photon.
 
PDPtr gluon_
 Pointer to the particle data object for the gluon.
 
Energy pTminQED_
 Variables for the POWHEG style corrections. More...
 
Energy pTminQCD_
 The cut off on pt for QCD, assuming massless quarks.
 
double preFactor_
 Overestimate for the prefactor.
 
vector< cPDPtrpartons_
 ParticleData objects for the partons.
 
vector< Lorentz5Momentum > loMomenta_
 Momenta of the leading-order partons.
 

Static Private Attributes

static const double EPS_
 Cut-off parameter.
 

Additional Inherited Members

- Public Types inherited from Herwig::HwMEBase
enum  POWHEGType { No, ISR, FSR, Both }
 Virtual members to be overridden by inheriting classes which implement hard corrections. More...
 
- Public Types inherited from ThePEG::MEBase
typedef vector< DiagPtr > DiagramVector
 
typedef DiagramVector::size_type DiagramIndex
 
typedef vector< ReweightPtrReweightVector
 
- Public Types inherited from ThePEG::InterfacedBase
enum  InitState
 
- Public Types inherited from ThePEG::Pointer::ReferenceCounted
typedef unsigned int CounterType
 
- Public Types inherited from ThePEG::LastXCombInfo< StandardXComb >
typedef ThePEG::Ptr< StandardXComb >::pointer XCPtr
 
typedef ThePEG::Ptr< StandardXComb >::const_pointer cXCPtr
 
typedef ThePEG::Ptr< StandardXComb >::transient_pointer tXCPtr
 
typedef ThePEG::Ptr< StandardXComb >::transient_const_pointer tcXCPtr
 
- Public Attributes inherited from ThePEG::InterfacedBase
 initializing
 
 uninitialized
 
 initialized
 
 runready
 
- Public Attributes inherited from ThePEG::Pointer::ReferenceCounted
const unsigned long uniqueId
 
- Static Protected Member Functions inherited from ThePEG::Interfaced
static void registerRepository (IBPtr)
 
static void registerRepository (IBPtr, string newName)
 
- Protected Attributes inherited from ThePEG::LastXCombInfo< StandardXComb >
XCPtr theLastXComb
 

Detailed Description

The MEee2gZ2qq class implements the matrix element for $e^+e^-\to Z/\gamma \to q\bar{q}$ 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.

See also
The interfaces defined for MEee2gZ2qq.

Definition at line 38 of file MEee2gZ2qq.h.

Member Function Documentation

◆ clone()

virtual IBPtr Herwig::MEee2gZ2qq::clone ( ) const
inlineprotectedvirtual

Make a simple clone of this object.

Returns
a pointer to the new object.

Implements ThePEG::InterfacedBase.

Definition at line 188 of file MEee2gZ2qq.h.

◆ colourGeometries()

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.

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

Implements ThePEG::MEBase.

◆ diagrams()

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.

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

Reimplemented from ThePEG::MEBase.

◆ doinit()

virtual void Herwig::MEee2gZ2qq::doinit ( )
protectedvirtual

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

Exceptions
InitExceptionif object could not be initialized properly.

Reimplemented from ThePEG::MEBase.

◆ fullclone()

virtual IBPtr Herwig::MEee2gZ2qq::fullclone ( ) const
inlineprotectedvirtual

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 194 of file MEee2gZ2qq.h.

References ThePEG::MEee2gZ2qq::doinit(), ThePEG::InterfacedBase::getReferences(), and ThePEG::InterfacedBase::rebind().

◆ getReferences()

virtual IVector Herwig::MEee2gZ2qq::getReferences ( )
protectedvirtual

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

Returns
a vector of pointers.

Reimplemented from ThePEG::InterfacedBase.

◆ hasPOWHEGCorrection()

virtual POWHEGType Herwig::MEee2gZ2qq::hasPOWHEGCorrection ( )
inlinevirtual

Members for hard corrections to the emission of QCD radiation.

Has a POWHEG style correction

Reimplemented from Herwig::HwMEBase.

Definition at line 58 of file MEee2gZ2qq.h.

◆ HelicityME()

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.

Parameters
finSpinors for incoming fermion
ainSpinors for incoming antifermion
foutSpinors for outgoing fermion
aoutSpinors for outgong antifermion
meSpin summed Matrix element
contThe continuum piece of the matrix element
BWThe Z piece of the matrix element

◆ Init()

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.

◆ loME()

double Herwig::MEee2gZ2qq::loME ( const vector< cPDPtr > &  partons,
const vector< Lorentz5Momentum > &  momenta,
bool  first 
) const
protected

Calculate the matrix element for $e^+e^-\to q \bar{q}$.

Parameters
partonsThe incoming and outgoing particles
momentaThe momenta of the incoming and outgoing particles
firstWhether or not to calculate the spin correlations

◆ me2()

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.

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

Implements ThePEG::MEBase.

◆ meRatio()

double Herwig::MEee2gZ2qq::meRatio ( vector< cPDPtr partons,
vector< Lorentz5Momentum >  momenta,
unsigned int  iemitter,
ShowerInteraction  inter,
bool  subtract = false 
) const
protected

The ratio of the matrix element for one additional jet over the leading order result.

In practice

\[\frac{\hat{s}|\overline{\mathcal{M}}|^2_2|D_{\rm emit}|}{4\pi C_F\alpha_S|\overline{\mathcal{M}}|^2_3\left(|D_{\rm emit}|+|D_{\rm spect}|\right)}\]

is returned where $\|\overline{\mathcal{M}}|^2$ is the spin and colour summed/averaged matrix element.

Parameters
partonsThe incoming and outgoing particles
momentaThe momenta of the incoming and outgoing particles
iemitterWhether the quark or antiquark is regardede as the emitter
interThe type of interaction
subtractWhether or not to subtract the relevant dipole term

◆ MEV()

double Herwig::MEee2gZ2qq::MEV ( double  ,
double   
)
private

Vector and axial vector parts of the matrix element.

Vector part of the matrix element

◆ operator=()

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.

◆ persistentInput()

void Herwig::MEee2gZ2qq::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.

◆ persistentOutput()

void Herwig::MEee2gZ2qq::persistentOutput ( PersistentOStream os) const

Function used to write out object persistently.

Parameters
osthe persistent output stream written to.

◆ PS()

double Herwig::MEee2gZ2qq::PS ( double  x1,
double  x2 
)
private

The matrix element, given $x_1$, $x_2$.

Parameters
x1$x_1$
x2$x_2$

◆ realME()

InvEnergy2 Herwig::MEee2gZ2qq::realME ( const vector< cPDPtr > &  partons,
const vector< Lorentz5Momentum > &  momenta,
ShowerInteraction  inter 
) const
protected

Calculate the matrix element for $e^-e^-\to q \bar q g$.

Parameters
partonsThe incoming and outgoing particles
momentaThe momenta of the incoming and outgoing particles
interThe type of interaction

◆ rebind()

virtual void Herwig::MEee2gZ2qq::rebind ( const TranslationMap trans)
protectedvirtual

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.

◆ softMatrixElementVeto()

virtual bool Herwig::MEee2gZ2qq::softMatrixElementVeto ( ShowerProgenitorPtr  initial,
ShowerParticlePtr  parent,
Branching  br 
)
virtual

Apply the soft matrix element correction.

Parameters
initialThe particle from the hard process which started the shower
parentThe initial particle in the current branching
brThe branching struct
Returns
If true the emission should be vetoed

Reimplemented from Herwig::HwMEBase.

Member Data Documentation

◆ FFZVertex_

AbstractFFVVertexPtr Herwig::MEee2gZ2qq::FFZVertex_
private

Pointers to the vertices.

Pointer to the fermion-antifermion Z vertex

Definition at line 389 of file MEee2gZ2qq.h.

◆ minflav_

int Herwig::MEee2gZ2qq::minflav_
private

Parameters controlling the leading-order process.

The minimum PDG of the quarks to be produced

Definition at line 369 of file MEee2gZ2qq.h.

◆ pTminQED_

Energy Herwig::MEee2gZ2qq::pTminQED_
private

Variables for the POWHEG style corrections.

The cut off on pt for QED, assuming massless quarks.

Definition at line 481 of file MEee2gZ2qq.h.

◆ Z0_

PDPtr Herwig::MEee2gZ2qq::Z0_
private

Pointer to the ParticleData objects.

Pointer to the particle data object for the Z

Definition at line 414 of file MEee2gZ2qq.h.


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