herwig is hosted by Hepforge, IPPP Durham
Herwig  7.2.1
Herwig::MEPP2GammaGammaPowheg Class Reference

Here is the documentation of the MEPP2GammaGammaPowheg class. More...

#include <MEPP2GammaGammaPowheg.h>

Inheritance diagram for Herwig::MEPP2GammaGammaPowheg:

Public Member Functions

Standard constructors and destructors.
 MEPP2GammaGammaPowheg ()
 The default constructor.
 
Member functions for the generation of hard QCD radiation
virtual POWHEGType hasPOWHEGCorrection ()
 Has a POWHEG style correction.
 
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 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[ $. More...
 
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. 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...
 
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 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...
 
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. 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)
 
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 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 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)
 
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 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 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())
 
 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 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

virtual double NLOWeight () const
 Calculate of the full next-to-leading order weight.
 
double loGammaGammaME (const cPDVector &particles, const vector< Lorentz5Momentum > &momenta, bool first=false) const
 Leading-order matrix element for $q\bar q\to \gamma\gamma$.
 
double loGammaqME (const cPDVector &particles, const vector< Lorentz5Momentum > &momenta, bool first=false) const
 Leading-order matrix element for $qg\to \gamma q$.
 
double loGammaqbarME (const cPDVector &particles, const vector< Lorentz5Momentum > &momenta, bool first=false) const
 Leading-order matrix element for $g\bar q\to \gamma \bar q$.
 
double loGammagME (const cPDVector &particles, const vector< Lorentz5Momentum > &momenta, bool first=false) const
 Leading-order matrix element for $q\bar q\to \gamma g$.
 
InvEnergy2 realGammaGammagME (const cPDVector &particles, const vector< Lorentz5Momentum > &momenta, DipoleType dipole, RadiationType rad, bool first=false) const
 Real emission matrix element for $q\bar q\to \gamma \gamma g$.
 
InvEnergy2 realGammaGammaqME (const cPDVector &particles, const vector< Lorentz5Momentum > &momenta, DipoleType dipole, RadiationType rad, bool first=false) const
 Real emission matrix element for $qg\to \gamma \gamma q$.
 
InvEnergy2 realGammaGammaqbarME (const cPDVector &particles, const vector< Lorentz5Momentum > &momenta, DipoleType dipole, RadiationType rad, bool first=false) const
 Real emission matrix element for $g\bar q\to \gamma \gamma \bar q$.
 
double subtractedVirtual () const
 The dipole subtractedvirtual contribution.
 
double subtractedReal (pair< double, double > x, double z, double zJac, double oldqPDF, double newqPDF, double newgPDF, bool order) const
 Subtracted real contribution.
 
double realME (const cPDVector &particles, const vector< Lorentz5Momentum > &momenta) const
 The real matrix element divided by $2 g_S^2$, to be implemented in the inheriting classes. More...
 
RealEmissionProcessPtr hardQCDEmission (RealEmissionProcessPtr, ParticleVector, pair< double, double >)
 Generate hard QCD emission.
 
RealEmissionProcessPtr hardQEDEmission (RealEmissionProcessPtr, ParticleVector, pair< double, double >)
 Generate hard QED emission.
 
pair< double, double > supressionFunction (Energy pT, Energy scale) const
 The supression function.
 
double collinearQuark (double x, Energy2 mu2, double jac, double z, double oldPDF, double newPDF) const
 Calculate of the collinear counterterms. More...
 
double collinearGluon (Energy2 mu2, double jac, double z, double oldPDF, double newPDF) const
 Gluon collinear counter term.
 
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...
 
- 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 IVector getReferences ()
 
virtual void rebind (const TranslationMap &)
 
virtual void readSetup (istream &is)
 
virtual void doupdate ()
 
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 &)
 
 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 Types

enum  DipoleType {
  IIQCD1 =2, IIQCD2 =4, IFQED1 =5, FIQED1 =6,
  IFQED2 =7, FIQED2 =8
}
 
enum  RadiationType { Subtraction, Hard, Shower }
 

Private Member Functions

MEPP2GammaGammaPowhegoperator= (const MEPP2GammaGammaPowheg &)=delete
 The assignment operator is private and must never be called. More...
 

Private Attributes

unsigned int contrib_
 Whether to generate the positive, negative or leading order contribution.
 
double power_
 Power for sampling $x_p$.
 
tcPDPtr gluon_
 Pointer to the gluon ParticleData object.
 
unsigned int process_
 Processes.
 
unsigned int threeBodyProcess_
 Processes.
 
int maxflavour_
 Allowed flavours of the incoming quarks.
 
double CFfact_
 Factor for $C_F$ dependent pieces.
 
double TRfact_
 Factor for $T_R$ dependent pieces.
 
double alphaS_
 Strong coupling.
 
bool fixedAlphaS_
 Use a fixed value of $\alpha_S$.
 
double alphaEM_
 Electromagnetic coupling.
 
double loME_
 Leading-order matrix element.
 
ProductionMatrixElement me_
 The matrix element.
 
DipoleType dipole_
 the selected dipole
 
Energy minpT_
 The transverse momentum of the jet.
 
ShowerAlphaPtr alphaQCD_
 Pointer to the object calculating the strong coupling.
 
ShowerAlphaPtr alphaQED_
 Pointer to the object calculating the EM.
 
unsigned int scaleChoice_
 Scale choice.
 
double scalePreFactor_
 Scale factor.
 
AbstractFFVVertexPtr FFPvertex_
 Vertices. More...
 
AbstractFFVVertexPtr FFGvertex_
 FFGVertex.
 
double zTilde_
 Kinematic variables for the real radiation. More...
 
double vTilde_
 Second variable.
 
double phi_
 Azimuthal angle.
 
unsigned int supressionFunction_
 Supression Function. More...
 
unsigned int supressionScale_
 Choice for the scale in the supression function.
 
Energy lambda_
 Scalar for the supression function.
 
bool quarkplus_
 Hard emission stuff. More...
 
vector< tcBeamPtrbeams_
 Properties of the incoming particles. More...
 
vector< tcPDPtrpartons_
 Pointers to the ParticleDataObjects for the partons.
 
double preQCDqqbarq_
 Constants for the sampling. More...
 
double preQCDqqbarqbar_
 The prefactor, $c$ for the $q\bar{q}$ channel.
 
double preQCDqg_
 The prefactor, $c$ for the $qg$ channel.
 
double preQCDgqbar_
 The prefactor, $c$ for the $g\bar{q}$ channel.
 
double preQEDqqbarq_
 
double preQEDqqbarqbar_
 
double preQEDqgq_
 
double preQEDgqbarqbar_
 
vector< double > prefactor_
 The prefactors as a vector for easy use.
 

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

Here is the documentation of the MEPP2GammaGammaPowheg class.

See also
The interfaces defined for MEPP2GammaGammaPowheg.

Definition at line 23 of file MEPP2GammaGammaPowheg.h.

Member Function Documentation

◆ clone()

virtual IBPtr Herwig::MEPP2GammaGammaPowheg::clone ( ) const
protectedvirtual

Make a simple clone of this object.

Returns
a pointer to the new object.

Implements ThePEG::InterfacedBase.

◆ collinearQuark()

double Herwig::MEPP2GammaGammaPowheg::collinearQuark ( double  x,
Energy2  mu2,
double  jac,
double  z,
double  oldPDF,
double  newPDF 
) const
protected

Calculate of the collinear counterterms.

Quark collinear counter term

◆ colourGeometries()

virtual Selector<const ColourLines *> Herwig::MEPP2GammaGammaPowheg::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::MEPP2GammaGammaPowheg::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::MEPP2GammaGammaPowheg::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::MEPP2GammaGammaPowheg::fullclone ( ) const
protectedvirtual

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.

◆ generateKinematics()

virtual bool Herwig::MEPP2GammaGammaPowheg::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.

◆ Init()

static void Herwig::MEPP2GammaGammaPowheg::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::MEPP2GammaGammaPowheg::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.

◆ operator=()

MEPP2GammaGammaPowheg& Herwig::MEPP2GammaGammaPowheg::operator= ( const MEPP2GammaGammaPowheg )
privatedelete

The assignment operator is private and must never be called.

In fact, it should not even be implemented.

◆ persistentInput()

void Herwig::MEPP2GammaGammaPowheg::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::MEPP2GammaGammaPowheg::persistentOutput ( PersistentOStream os) const

Function used to write out object persistently.

Parameters
osthe persistent output stream written to.

◆ realME()

double Herwig::MEPP2GammaGammaPowheg::realME ( const cPDVector particles,
const vector< Lorentz5Momentum > &  momenta 
) const
protected

The real matrix element divided by $2 g_S^2$, to be implemented in the inheriting classes.

Parameters
particlesThe ParticleData objects of the particles
momentaThe momenta of the particles

Member Data Documentation

◆ beams_

vector<tcBeamPtr> Herwig::MEPP2GammaGammaPowheg::beams_
private

Properties of the incoming particles.

Pointers to the BeamParticleData objects

Definition at line 471 of file MEPP2GammaGammaPowheg.h.

◆ FFPvertex_

AbstractFFVVertexPtr Herwig::MEPP2GammaGammaPowheg::FFPvertex_
private

Vertices.

FFPVertex

Definition at line 335 of file MEPP2GammaGammaPowheg.h.

◆ preQCDqqbarq_

double Herwig::MEPP2GammaGammaPowheg::preQCDqqbarq_
private

Constants for the sampling.

The distribution is assumed to have the form $\frac{c}{{\rm GeV}}\times\left(\frac{{\rm GeV}}{p_T}\right)^n$ The prefactor, $c$ for the $q\bar{q}$ channel

Definition at line 487 of file MEPP2GammaGammaPowheg.h.

◆ quarkplus_

bool Herwig::MEPP2GammaGammaPowheg::quarkplus_
private

Hard emission stuff.

Whether the quark is in the + or - z direction

Definition at line 461 of file MEPP2GammaGammaPowheg.h.

◆ supressionFunction_

unsigned int Herwig::MEPP2GammaGammaPowheg::supressionFunction_
private

Supression Function.

Choice of the supression function

Definition at line 440 of file MEPP2GammaGammaPowheg.h.

◆ zTilde_

double Herwig::MEPP2GammaGammaPowheg::zTilde_
mutableprivate

Kinematic variables for the real radiation.

First variable

Definition at line 350 of file MEPP2GammaGammaPowheg.h.


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