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Herwig 7.3.0
Herwig::MEPP2ZJet Class Reference

The MEPP2ZJet class implements the matrix element for the production of a Z boson + a jet including the decay of the Z including \(Z/\gamma\) interference. More...

#include <MEPP2ZJet.h>

Inheritance diagram for Herwig::MEPP2ZJet:

Public Member Functions

 MEPP2ZJet ()
 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 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 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.
 
- Public Member Functions inherited from Herwig::HwMEBase
 HwMEBase ()
 Default constructor.
 
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 POWHEGType hasPOWHEGCorrection ()
 Has a POWHEG style correction.
 
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 (PPtr parent, PPtr progenitor, const bool &fs, const Energy &highestpT, const vector< tcPDPtr > &ids, const double &z, const Energy &scale, const Energy &pT)
 Apply the soft matrix element correction.
 
virtual RealEmissionProcessPtr generateHardest (RealEmissionProcessPtr, ShowerInteraction)
 Apply the POWHEG style correction.
 
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.
 
- Public Member Functions inherited from ThePEG::MEBase
virtual unsigned int orderInAlphaS () const=0
 
virtual unsigned int orderInAlphaEW () const=0
 
virtual double me2 () const=0
 
virtual Energy2 scale () const=0
 
virtual double alphaS () const
 
virtual double alphaEM () const
 
void setKinematics (tPPair in, const PVector &out)
 
virtual void setKinematics ()
 
virtual void constructVertex (tSubProPtr sub)
 
virtual void constructVertex (tSubProPtr sub, const ColourLines *cl)
 
virtual int nDim () const
 
virtual bool generateKinematics (const double *r)=0
 
virtual bool wantCMS () const
 
virtual bool headCuts () const
 
virtual bool ignoreCuts () const
 
virtual bool apply () const
 
virtual CrossSection dSigHatDR () const=0
 
virtual map< string, double > generateOptionalWeights ()
 
virtual bool haveX1X2 () const
 
virtual bool havePDFWeight1 () const
 
virtual bool havePDFWeight2 () const
 
virtual bool keepRandomNumbers () const
 
virtual void generateSubCollision (SubProcess &)
 
virtual void clearKinematics ()
 
virtual void getDiagrams () const=0
 
virtual bool noMirror () const
 
const DiagramVectordiagrams () const
 
virtual Selector< const ColourLines * > colourGeometries (tcDiagPtr diag) const=0
 
virtual const ColourLinesselectColourGeometry (tcDiagPtr diag) const
 
virtual Selector< DiagramIndexdiagrams (const DiagramVector &) 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
 
virtual unsigned int orderInAlphaS () const=0
 
virtual unsigned int orderInAlphaEW () const=0
 
virtual double me2 () const=0
 
virtual Energy2 scale () const=0
 
virtual double alphaS () const
 
virtual double alphaEM () const
 
void setKinematics (tPPair in, const PVector &out)
 
virtual void setKinematics ()
 
virtual void constructVertex (tSubProPtr sub)
 
virtual void constructVertex (tSubProPtr sub, const ColourLines *cl)
 
virtual int nDim () const
 
virtual bool generateKinematics (const double *r)=0
 
virtual bool wantCMS () const
 
virtual bool headCuts () const
 
virtual bool ignoreCuts () const
 
virtual bool apply () const
 
virtual CrossSection dSigHatDR () const=0
 
virtual map< string, double > generateOptionalWeights ()
 
virtual bool haveX1X2 () const
 
virtual bool havePDFWeight1 () const
 
virtual bool havePDFWeight2 () const
 
virtual bool keepRandomNumbers () const
 
virtual void generateSubCollision (SubProcess &)
 
virtual void clearKinematics ()
 
virtual void getDiagrams () const=0
 
virtual bool noMirror () const
 
const DiagramVectordiagrams () const
 
virtual Selector< const ColourLines * > colourGeometries (tcDiagPtr diag) const=0
 
virtual const ColourLinesselectColourGeometry (tcDiagPtr diag) const
 
virtual Selector< DiagramIndexdiagrams (const DiagramVector &) 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 ThePEG::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 StandardModelBaseSM () 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
 
- Public Member Functions inherited from ThePEG::InterfacedBase
string fullName () const
 
string name () const
 
string path () const
 
string comment () const
 
void setup (istream &is)
 
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
 
virtual IBPtr fullclone () const
 
void persistentOutput (PersistentOStream &os) const
 
void persistentInput (PersistentIStream &is, int version)
 
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
 
virtual IBPtr fullclone () const
 
- Public Member Functions inherited from ThePEG::Base
void debug () const
 
virtual void debugme () const
 
- Public Member Functions inherited from ThePEG::Pointer::ReferenceCounted
CounterType referenceCount () const
 
- Public Member Functions inherited from ThePEG::Named
 Named (const string &newName=string())
 
 Named (const Named &)=default
 
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 XC & lastXComb () const
 
const XC & lastXComb () const
 
tXCPtr lastXCombPtr () const
 
tXCPtr lastXCombPtr () const
 
const XC & lastHeadXComb () const
 
const XC & lastHeadXComb () 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
 
double lastAlphaS () const
 
double lastAlphaEM () const
 
const vector< Lorentz5Momentum > & meMomenta () const
 
double lastME2 () const
 
double lastPreweight () const
 
double jacobian () const
 
CrossSection lastMECrossSection () const
 
double lastMEPDFWeight () const
 
double lastMECouplings () const
 
tSubProPtr subProcess () const
 
const cPDVectormePartonData () const
 

Protected Member Functions

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.
 
- Protected Member Functions inherited from Herwig::HwMEBase
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 massOption (vector< unsigned int > iopt)
 Set the treatment of the outgoing masses.
 
void rescalingOption (unsigned int iopt)
 Rescaled momenta for the helicity ME.
 
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.
 
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).
 
- Protected Member Functions inherited from ThePEG::MEBase
virtual void doinit ()
 
virtual void doinitrun ()
 
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
 
- 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
virtual void readSetup (istream &is)
 
virtual void doupdate ()
 
virtual void doinit ()
 
virtual void doinitrun ()
 
virtual void dofinish ()
 
virtual IVector getReferences ()
 
virtual void rebind (const TranslationMap &)
 
virtual IBPtr clone () const=0
 
 InterfacedBase (string newName)
 
 InterfacedBase (const InterfacedBase &i)
 
virtual void readSetup (istream &is)
 
virtual void doupdate ()
 
virtual void doinit ()
 
virtual void doinitrun ()
 
virtual void dofinish ()
 
virtual IVector getReferences ()
 
virtual void rebind (const TranslationMap &)
 
- Protected Member Functions inherited from ThePEG::Pointer::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 Attributes

Pointers to the \f$Z^0\f$ and \f$\gamma\f$ ParticleData objects
tcPDPtr _z0
 Pointer to the Z ParticleData object.
 
tcPDPtr _gamma
 Pointer to the photon ParticleData object.
 
Switches to control the particles in the hard process
unsigned int _process
 Subprocesses to include.
 
int _maxflavour
 Allowed flavours for the incoming quarks.
 
int _zdec
 Control over which Z decay modes to include.
 
unsigned int _gammaZ
 Which terms to include.
 
unsigned int _widthopt
 Option for the treatment of the W off-shell effects.
 
double _pprob
 Probability of selecting \(1/s^2\) for the jacobian transformation of the boson mass.
 
ProductionMatrixElement _me
 Matrix element for spin correlations.
 
Energy2 _scale
 Storage of the scale to avoid the need to recalculate.
 
Energy2 _mz2
 Storage of the off-shell Z mass to avoid the need to recalculate.
 

Standard Interfaced functions.

AbstractFFVVertexPtr _theFFZVertex
 Vertices for the helicity amplitude calculation.
 
AbstractFFVVertexPtr _theFFPVertex
 Pointer to the photon vertex.
 
AbstractFFVVertexPtr _theQQGVertex
 Pointer to the \(qqg\) vertex.
 
virtual void doinit ()
 Initialize this object after the setup phase before saving an EventGenerator to disk.
 
MEPP2ZJetoperator= (const MEPP2ZJet &)=delete
 The assignment operator is private and must never be called.
 

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 void Init ()
 The standard Init function used to initialize the interfaces.
 
InvEnergy2 qqbarME (vector< SpinorWaveFunction > &fin, vector< SpinorBarWaveFunction > &ain, vector< VectorWaveFunction > &gout, vector< SpinorBarWaveFunction > &lm, vector< SpinorWaveFunction > &lp, bool me=false) const
 Matrix elements for the different subprocesses.
 
InvEnergy2 qgME (vector< SpinorWaveFunction > &fin, vector< VectorWaveFunction > &gin, vector< SpinorBarWaveFunction > &fout, vector< SpinorBarWaveFunction > &lm, vector< SpinorWaveFunction > &lp, bool me=false) const
 Matrix element for \(qg\to Z/\gamma q\).
 
InvEnergy2 qbargME (vector< SpinorBarWaveFunction > &fin, vector< VectorWaveFunction > &gin, vector< SpinorWaveFunction > &fout, vector< SpinorBarWaveFunction > &lm, vector< SpinorWaveFunction > &lp, bool me=false) const
 Matrix element for \(\bar{q}g\to Z/\gamma\bar{q}\).
 

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< XC >::pointer XCPtr
 
typedef ThePEG::Ptr< XC >::const_pointer cXCPtr
 
typedef ThePEG::Ptr< XC >::transient_pointer tXCPtr
 
typedef ThePEG::Ptr< XC >::transient_const_pointer tcXCPtr
 
- Static Public Member Functions inherited from Herwig::HwMEBase
static void Init ()
 The standard Init function used to initialize the interfaces.
 
- 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 ()
 
- 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 MEPP2ZJet class implements the matrix element for the production of a Z boson + a jet including the decay of the Z including \(Z/\gamma\) interference.

See also
The interfaces defined for MEPP2ZJet.

Definition at line 28 of file MEPP2ZJet.h.

Member Function Documentation

◆ clone()

virtual IBPtr Herwig::MEPP2ZJet::clone ( ) const
inlineprotectedvirtual

Make a simple clone of this object.

Returns
a pointer to the new object.

Implements ThePEG::InterfacedBase.

Definition at line 203 of file MEPP2ZJet.h.

◆ colourGeometries()

virtual Selector< const ColourLines * > Herwig::MEPP2ZJet::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.

◆ constructVertex()

virtual void Herwig::MEPP2ZJet::constructVertex ( tSubProPtr  )
virtual

Construct the vertex of spin correlations.

Reimplemented from ThePEG::MEBase.

◆ diagrams()

virtual Selector< DiagramIndex > Herwig::MEPP2ZJet::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::MEPP2ZJet::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.

◆ dSigHatDR()

virtual CrossSection Herwig::MEPP2ZJet::dSigHatDR ( ) const
virtual

Return the matrix element squared differential in the variables given by the last call to generateKinematics().

Reimplemented from Herwig::HwMEBase.

◆ fullclone()

virtual IBPtr Herwig::MEPP2ZJet::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 209 of file MEPP2ZJet.h.

◆ generateKinematics()

virtual bool Herwig::MEPP2ZJet::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.

◆ getDiagrams()

virtual void Herwig::MEPP2ZJet::getDiagrams ( ) const
virtual

Add all possible diagrams with the add() function.

Implements ThePEG::MEBase.

◆ Init()

static void Herwig::MEPP2ZJet::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.

◆ me2()

virtual double Herwig::MEPP2ZJet::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.

◆ nDim()

virtual int Herwig::MEPP2ZJet::nDim ( ) const
virtual

The number of internal degrees of freedom used in the matrix element.

Reimplemented from Herwig::HwMEBase.

◆ operator=()

MEPP2ZJet & Herwig::MEPP2ZJet::operator= ( const MEPP2ZJet )
privatedelete

The assignment operator is private and must never be called.

In fact, it should not even be implemented.

◆ orderInAlphaEW()

virtual unsigned int Herwig::MEPP2ZJet::orderInAlphaEW ( ) const
virtual

Return the order in \(\alpha_{EW}\) in which this matrix element is given.

Implements ThePEG::MEBase.

◆ orderInAlphaS()

virtual unsigned int Herwig::MEPP2ZJet::orderInAlphaS ( ) const
virtual

Return the order in \(\alpha_S\) in which this matrix element is given.

Implements ThePEG::MEBase.

◆ persistentInput()

void Herwig::MEPP2ZJet::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::MEPP2ZJet::persistentOutput ( PersistentOStream os) const

Function used to write out object persistently.

Parameters
osthe persistent output stream written to.

◆ qbargME()

InvEnergy2 Herwig::MEPP2ZJet::qbargME ( vector< SpinorBarWaveFunction > &  fin,
vector< VectorWaveFunction > &  gin,
vector< SpinorWaveFunction > &  fout,
vector< SpinorBarWaveFunction > &  lm,
vector< SpinorWaveFunction > &  lp,
bool  me = false 
) const
protected

Matrix element for \(\bar{q}g\to Z/\gamma\bar{q}\).

Parameters
finSpinors for incoming antiquark
ginPolarization vectors for the incoming gluon
foutSpinors for outgoing antiquark
lmSpinors for outgoing lepton
lpSpinors for outgoing antilepton
meWhether or not to calculate the matrix element for spin correlations

◆ qgME()

InvEnergy2 Herwig::MEPP2ZJet::qgME ( vector< SpinorWaveFunction > &  fin,
vector< VectorWaveFunction > &  gin,
vector< SpinorBarWaveFunction > &  fout,
vector< SpinorBarWaveFunction > &  lm,
vector< SpinorWaveFunction > &  lp,
bool  me = false 
) const
protected

Matrix element for \(qg\to Z/\gamma q\).

Parameters
finSpinors for incoming quark
ginPolarization vectors for the incoming gluon
foutSpinors for outgoing quark
lmSpinors for outgoing lepton
lpSpinors for outgoing antilepton
meWhether or not to calculate the matrix element for spin correlations

◆ qqbarME()

InvEnergy2 Herwig::MEPP2ZJet::qqbarME ( vector< SpinorWaveFunction > &  fin,
vector< SpinorBarWaveFunction > &  ain,
vector< VectorWaveFunction > &  gout,
vector< SpinorBarWaveFunction > &  lm,
vector< SpinorWaveFunction > &  lp,
bool  me = false 
) const
protected

Matrix elements for the different subprocesses.

Matrix element for \(q\bar{q}\to Z/\gamma g\).

Parameters
finSpinors for incoming quark
ainSpinors for incoming antiquark
goutPolarization vectors for the outgoing gluon
lmSpinors for outgoing lepton
lpSpinors for outgoing antilepton
meWhether or not to calculate the matrix element for spin correlations

◆ scale()

virtual Energy2 Herwig::MEPP2ZJet::scale ( ) const
virtual

Return the scale associated with the last set phase space point.

Implements ThePEG::MEBase.

Member Data Documentation

◆ _gamma

tcPDPtr Herwig::MEPP2ZJet::_gamma
private

Pointer to the photon ParticleData object.

Definition at line 266 of file MEPP2ZJet.h.

◆ _gammaZ

unsigned int Herwig::MEPP2ZJet::_gammaZ
private

Which terms to include.

Definition at line 291 of file MEPP2ZJet.h.

◆ _maxflavour

int Herwig::MEPP2ZJet::_maxflavour
private

Allowed flavours for the incoming quarks.

Definition at line 281 of file MEPP2ZJet.h.

◆ _me

ProductionMatrixElement Herwig::MEPP2ZJet::_me
mutableprivate

Matrix element for spin correlations.

Definition at line 308 of file MEPP2ZJet.h.

◆ _mz2

Energy2 Herwig::MEPP2ZJet::_mz2
private

Storage of the off-shell Z mass to avoid the need to recalculate.

Definition at line 318 of file MEPP2ZJet.h.

◆ _pprob

double Herwig::MEPP2ZJet::_pprob
private

Probability of selecting \(1/s^2\) for the jacobian transformation of the boson mass.

Definition at line 303 of file MEPP2ZJet.h.

◆ _process

unsigned int Herwig::MEPP2ZJet::_process
private

Subprocesses to include.

Definition at line 276 of file MEPP2ZJet.h.

◆ _scale

Energy2 Herwig::MEPP2ZJet::_scale
private

Storage of the scale to avoid the need to recalculate.

Definition at line 313 of file MEPP2ZJet.h.

◆ _theFFPVertex

AbstractFFVVertexPtr Herwig::MEPP2ZJet::_theFFPVertex
private

Pointer to the photon vertex.

Definition at line 246 of file MEPP2ZJet.h.

◆ _theFFZVertex

AbstractFFVVertexPtr Herwig::MEPP2ZJet::_theFFZVertex
private

Vertices for the helicity amplitude calculation.

Pointer to the Z vertex

Definition at line 241 of file MEPP2ZJet.h.

◆ _theQQGVertex

AbstractFFVVertexPtr Herwig::MEPP2ZJet::_theQQGVertex
private

Pointer to the \(qqg\) vertex.

Definition at line 251 of file MEPP2ZJet.h.

◆ _widthopt

unsigned int Herwig::MEPP2ZJet::_widthopt
private

Option for the treatment of the W off-shell effects.

Definition at line 296 of file MEPP2ZJet.h.

◆ _z0

tcPDPtr Herwig::MEPP2ZJet::_z0
private

Pointer to the Z ParticleData object.

Definition at line 261 of file MEPP2ZJet.h.

◆ _zdec

int Herwig::MEPP2ZJet::_zdec
private

Control over which Z decay modes to include.

Definition at line 286 of file MEPP2ZJet.h.


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