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Herwig 7.3.0
Herwig::MEPP2VVPowheg Class Reference

Here is the documentation of the MEPP2VVPowheg class. More...

#include <MEPP2VVPowheg.h>

Inheritance diagram for Herwig::MEPP2VVPowheg:

Public Member Functions

 MEPP2VVPowheg ()
 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 inter)
 Apply the POWHEG style correction.
 
virtual bool generateKinematics (const double *r)
 Generate internal degrees of freedom given nDim() uniform random numbers in the interval \( ]0,1[ \).
 
virtual int nDim () const
 The number of internal degrees of freedom used in the matrix element.
 
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.
 
bool sanityCheck () const
 This member check the collinear limits of the real emission matrix elements are equal to the appropriate combinations of Born ME's multiplied by the splitting functions.
 
Complex CKM (int ix, int iy) const
 Return the CKM matrix elements.
 
- Public Member Functions inherited from Herwig::MEPP2VV
 MEPP2VV ()
 The default constructor.
 
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 int process () const
 Return the process being run (WW/ZZ/WZ).
 
virtual void getDiagrams () const
 Add all possible diagrams with the add() function.
 
virtual Selector< DiagramIndexdiagrams (const DiagramVector &dv) const
 Get diagram selector.
 
virtual Selector< const ColourLines * > colourGeometries (tcDiagPtr diag) const
 Return a Selector with possible colour geometries for the selected diagram weighted by their relative probabilities.
 
virtual double getCosTheta (double cthmin, double cthmax, const double r)
 Used internally by generateKinematics, after calculating the limits on cos(theta).
 
virtual void constructVertex (tSubProPtr)
 Construct the vertex of spin correlations.
 
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 Herwig::HwMEBase
 HwMEBase ()
 Default constructor.
 
virtual CrossSection dSigHatDR () const
 Return the matrix element for the kinematical configuation previously provided by the last call to setKinematics().
 
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 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.
 
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
 

Standard Interfaced functions.

double M_V_regular_
 Member variable to store the regular part of the virtual correction matrix element(s).
 
Energy2 t_u_M_R_qqb_
 Member variable to store the matrix element q + qb -> n + g times tk*uk.
 
Energy2 t_u_M_R_qg_
 Member variable to store the matrix element q + g -> n + q times tk*uk.
 
Energy2 t_u_M_R_gqb_
 Member variable to store the matrix element g + qb -> n + q times tk*uk.
 
Energy2 t_u_M_R_qqb_hel_amp_
 Member variable to store the matrix element q + qb -> n + g times (tk*uk)^2 - using helicity amplitudes.
 
Energy2 t_u_M_R_qg_hel_amp_
 Member variable to store the matrix element q + g -> n + q times (tk*uk)^2 - using helicity amplitudes.
 
Energy2 t_u_M_R_gqb_hel_amp_
 Member variable to store the matrix element g + qb -> n + qb times (tk*uk)^2 - using helicity amplitudes.
 
double M_Born_
 Member variable to store the Born matrix element as given in Equation 3.1 - 3.3 in NPB 383 (1992) *** modulo a factor 1/(2s) ***, which is a flux factor that those authors absorb in the matrix element.
 
void getKinematics (double xt, double y, double theta2)
 Function to set the born variables.
 
double NLOweight () const
 Calculate the correction weight with which leading-order configurations are re-weighted.
 
double Lhat_ab (tcPDPtr a, tcPDPtr b, realVVKinematics Kinematics) const
 Calculate the ratio of the NLO luminosity to the LO luminosity function for the \(q\bar{q}\) initiated channel.
 
double Vtilde_universal (realVVKinematics S) const
 Calculate the universal soft-virtual contribution to the NLO weight.
 
double Ctilde_Ltilde_qq_on_x (tcPDPtr a, tcPDPtr b, realVVKinematics C) const
 Function for calculation of the \(q\bar{q}\) initiated real contribution.
 
double Ctilde_Ltilde_gq_on_x (tcPDPtr a, tcPDPtr b, realVVKinematics C) const
 Function for calculation of the \(gq\) initiated real contribution.
 
double Rtilde_Ltilde_qqb_on_x (tcPDPtr a, tcPDPtr b) const
 Function for calculation of the \(q\bar{q}\) initiated real contribution.
 
double Rtilde_Ltilde_qg_on_x (tcPDPtr a, tcPDPtr b) const
 Function for calculation of the \(qg\) initiated real contribution.
 
double Rtilde_Ltilde_gqb_on_x (tcPDPtr a, tcPDPtr b) const
 Function for calculation of the \(gqb\) initiated real contribution.
 
double M_V_regular (realVVKinematics S) const
 The regular part of the virtual correction matrix element(s).
 
Energy2 t_u_M_R_qqb (realVVKinematics R) const
 The matrix element q + qb -> n + g times tk*uk.
 
Energy2 t_u_M_R_qg (realVVKinematics R) const
 The matrix element q + g -> n + q times tk*uk.
 
Energy2 t_u_M_R_gqb (realVVKinematics R) const
 The matrix element g + qb -> n + q times tk*uk.
 
Energy2 t_u_M_R_qqb_hel_amp (realVVKinematics R) const
 The matrix element q + qb -> n + g times (tk*uk)^2 - using helicity amplitudes.
 
Energy2 t_u_M_R_qg_hel_amp (realVVKinematics R) const
 The matrix element q + g -> n + q times (tk*uk)^2 - using helicity amplitudes.
 
Energy2 t_u_M_R_gqb_hel_amp (realVVKinematics R) const
 The matrix element g + qb -> n + qb times (tk*uk)^2 - using helicity amplitudes.
 
double lo_me () const
 The leading order matrix element - using helicity amplitudes.
 
double M_Born_WZ (bornVVKinematics B) const
 The Born matrix element as given in Equation 3.1 - 3.3 in NPB 383 (1992) *** modulo a factor 1/(2s) ***, which is a flux factor that those authors absorb in the matrix element.
 
double M_Born_ZZ (bornVVKinematics B) const
 The Born matrix element as given in Equation 2.18 - 2.19 in NPB 357 (1991) *** modulo a factor 1/(2s) ***, which is a flux factor that those authors absorb in the matrix element.
 
double M_V_regular_ZZ (realVVKinematics S) const
 M_V_regular_ZZ is the regular part of the one-loop ZZ matrix element exactly as defined in Eqs.
 
Energy2 t_u_M_R_qqb_ZZ (realVVKinematics R) const
 t_u_M_R_qqb_ZZ is the q + qb -> n + g times tk*uk real emission matrix element as defined in Eq.
 
double M_Born_WW (bornVVKinematics B) const
 The Born matrix element as given in Equation 3.2 - 3.8 in NPB 410 (1993) *** modulo a factor 1/(2s) ***, which is a flux factor that those authors absorb in the matrix element.
 
double M_V_regular_WW (realVVKinematics S) const
 M_V_regular_WW is the regular part of the one-loop WW matrix element exactly as defined in Eqs.
 
Energy2 t_u_M_R_qqb_WW (realVVKinematics R) const
 t_u_M_R_qqb_WW is the q + qb -> n + g times tk*uk real emission matrix element as defined in Eq.
 
Energy2 mu_F2 () const
 Return the factorion scale squared.
 
Energy2 mu_UV2 () const
 Return the renormalisation scale squared.
 
virtual void doinit ()
 Initialize this object after the setup phase before saving an EventGenerator to disk.
 

Clone Methods.

double tiny
 Parameters for the NLO weight.
 
tcBeamPtr hadron_A_
 The BeamParticleData object for the plus and minus direction hadrons.
 
tcBeamPtr hadron_B_
 
bornVVKinematics B_
 Born / virtual 2->2 kinematics.
 
realVVKinematics S_
 Soft limit of the 2->3 real emission kinematics.
 
realVVKinematics SCp_
 Soft-collinear limit of the 2->3 kinematics (emission in +z direction).
 
realVVKinematics SCm_
 The collinear limit of the 2->3 kinematics (emission in -z direction).
 
realVVKinematics Cp_
 The collinear limit of the 2->3 kinematics (emission in +z direction).
 
realVVKinematics Cm_
 The collinear limit of the 2->3 kinematics (emission in -z direction).
 
realVVKinematics H_
 The resolved 2->3 real emission kinematics:
 
tcPDPtr ab_
 The ParticleData object for the plus and minus lo partons.
 
tcPDPtr bb_
 
tcPDPtr quark_
 The ParticleData object for the quark and antiquark (which can be in a different order to ab_ and bb_).
 
tcPDPtr antiquark_
 
double lo_lumi_
 Values of the PDF's before radiation.
 
double lo_me2_
 The value of the leading order qqbar->VV matrix element.
 
double CF_
 The CF_ colour factor.
 
double TR_
 The TR_ colour factor.
 
double NC_
 The number of colours.
 
double gW_
 The weak coupling and the sin (squared) of the Weinberg angle.
 
double sin2ThetaW_
 
double guL_
 The up and down, left handed, quark-boson couplings.
 
double gdL_
 
double guR_
 The up and down, right handed, quark-boson couplings (for WW & ZZ)
 
double gdR_
 
double eZ_
 The TGC coupling.
 
double eZ2_
 The TGC coupling squared.
 
double Fij2_
 The CKM factor (Fij^2)
 
unsigned int contrib_
 Whether to generate the positive, negative or leading order contribution.
 
unsigned int channels_
 Whether to generate all channels contributions or just qqb or just qg+gqb contributions.
 
unsigned int nlo_alphaS_opt_
 Whether to use a fixed or a running QCD coupling for the NLO weight.
 
double fixed_alphaS_
 The value of alphaS to use for the nlo weight if nlo_alphaS_opt_=1.
 
unsigned int removebr_
 Flag to remove or multiply in MCFM branching fractions for testing.
 
unsigned int scaleopt_
 Selects a dynamic (sHat) or fixed factorization scale.
 
Energy mu_F_
 The factorization scale.
 
Energy mu_UV_
 The renormalization scale.
 
Energy2 k1r_perp2_lab_
 The pT of V1 in a radiative event in the lab frame (for scale setting only)
 
Energy2 k2r_perp2_lab_
 The pT of V2 in a radiative event in the lab frame (for scale setting only)
 
vector< vector< Complex > > ckm_
 The ckm matrix elements (unsquared, to allow interference)
 
bool helicityConservation_
 Option to impose helicity conservation on the real NLO ME's (greatly improves evaluation time).
 
ProductionMatrixElement qqb_hel_amps_
 The q + qb -> v1 + v2 + g helicity amplitudes

 
ProductionMatrixElement qg_hel_amps_
 The q + g -> v1 + v2 + q helicity amplitudes

 
ProductionMatrixElement gqb_hel_amps_
 The g + qb -> v1 + v2 + qb helicity amplitudes

 
AbstractFFVVertexPtr FFPvertex_
 The vertices.
 
AbstractFFVVertexPtr FFWvertex_
 The W fermion-antifermion vertex.
 
AbstractFFVVertexPtr FFZvertex_
 The Z fermion-antifermionvertex.
 
AbstractVVVVertexPtr WWWvertex_
 The triple electroweak gauge boson vertex.
 
AbstractFFVVertexPtr FFGvertex_
 The quark-antiquark gluon vertex.
 
double alphaS_
 The value of \(\alpha_S\) used for the calculation.
 
bool realMESpinCorrelations_
 If this boolean is true the n+1 body helicity amplitudes will be used to calculate a hard vertex based on those kinematics for spin correlations in the decays.
 
double lo_me_
 The colour & spin averaged n-body (leading order) matrix element squared.
 
realVVKinematics R_
 The resolved 2->3 real emission kinematics.
 
unsigned int channel_
 This specifies the emitting configuration: 1: q + qbar -> V1 + V2 + g 2: q + g -> V1 + V2 + q 3: g + qbar -> V1 + V2 + qbar.
 
int fermionNumberOfMother_
 Identifies the space-like mother of the branching as quark (+1) or antiquark (-1):
 
ShowerAlphaPtr showerAlphaS_
 Pointer to the object calculating the strong coupling.
 
double power_
 Constants for the sampling.
 
double preqqbar_
 The prefactor, \(c\) for the \(q\bar{q}\) channel.
 
double preqg_
 The prefactor, \(c\) for the \(qg\) channel.
 
double pregqbar_
 The prefactor, \(c\) for the \(g\bar{q}\) channel.
 
double b0_
 The QCD beta function divided by 4pi, (11-2/3*nf)/4/pi, with nf = 5.
 
Energy LambdaQCD_
 The fundamental QCD scale in the one-loop alpha_{S} used for the crude (not the very crude) overestimate of the Sudakov exponent.
 
vector< double > prefactor_
 The prefactors as a vector for easy use.
 
PPtr qProgenitor_
 Properties of the incoming particles.
 
PPtr qbProgenitor_
 
PPtr showerQuark_
 Pointers to the Shower particle objects for the partons.
 
PPtr showerAntiquark_
 
tcBeamPtr qHadron_
 Pointers to the BeamParticleData objects.
 
tcBeamPtr qbHadron_
 
PPtr gluon_
 Properties of the boson and jets.
 
PPtr V1_
 
PPtr V2_
 
vector< PPtrchildren_
 
bool flipped_
 Flag indicating if the q & qbar are flipped or not i.e.
 
double Yk_
 the rapidity of the jet
 
Energy pT_
 The transverse momentum of the jet.
 
Energy min_pT_
 The transverse momentum of the jet.
 
Energy2 QCDScale_
 Scale for alpha_S: pT^2 of the diboson system.
 
Energy2 PDFScale_
 Scale for real emission PDF:
 
Energy2 EWScale_
 Scale of electroweak vertices: mVV^2 the invariant mass of the diboson system.
 
Complex productionMatrix_ [3][3][3][3]
 A matrix to hold the home-grown production matrix element.
 
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.
 
double getResult (int emis_type, realVVKinematics R, Energy pT)
 Returns the matrix element for a given type of process, rapidity of the jet \(y_j\) and transverse momentum \(p_T\).
 
bool getEvent (vector< Lorentz5Momentum > &pnew, unsigned int &emissiontype)
 generates the hardest emission (yj,p)
 
void setTheScales (Energy pT)
 sets the QCD, EW and PDF scales
 
Energy2 t_u_M_R_qqb_hel_amp (realVVKinematics R, bool getMatrix) const
 The matrix element q + qb -> n + g times tk*uk.
 
Energy2 t_u_M_R_qg_hel_amp (realVVKinematics R, bool getMatrix) const
 The matrix element q + g -> n + q times tk*uk.
 
Energy2 t_u_M_R_gqb_hel_amp (realVVKinematics R, bool getMatrix) const
 The matrix element g + qb -> n + q times tk*uk.
 
double lo_me (bool getMatrix) 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.
 
void recalculateVertex ()
 Recalculate hard vertex to include spin correlations for radiative events.
 
bool isotropicDecayer ()
 Member which selects a two body decay mode for each vector boson and distributes decay products isotropically.
 
Energy2 triangleFn (Energy2, Energy2, Energy2)
 The triangle function lambda(x,y,z)=sqrt(x^2+y^2+z^2-2*x*y-2*y*z-2*x*z)
 
MEPP2VVPowhegoperator= (const MEPP2VVPowheg &)=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.
 

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::MEPP2VV
static void Init ()
 The standard Init function used to initialize the interfaces.
 
- 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
 
- Protected Member Functions inherited from Herwig::MEPP2VV
double WWME (vector< SpinorWaveFunction > &f1, vector< SpinorBarWaveFunction > &a1, vector< VectorWaveFunction > &v1, vector< VectorWaveFunction > &v2, bool me) const
 Matrix element for \(f\bar{f}\to W^+W^-\).
 
double WZME (vector< SpinorWaveFunction > &f1, vector< SpinorBarWaveFunction > &a1, vector< VectorWaveFunction > &v1, vector< VectorWaveFunction > &v2, bool me) const
 Matrix element for \(f\bar{f}\to W^\pm Z^0\).
 
double ZZME (vector< SpinorWaveFunction > &f1, vector< SpinorBarWaveFunction > &a1, vector< VectorWaveFunction > &v1, vector< VectorWaveFunction > &v2, bool me) const
 Matrix element for \(f\bar{f}\to Z^0Z^0\).
 
- 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.
 
- 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)
 
- 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 MEPP2VVPowheg class.

See also
The interfaces defined for MEPP2VVPowheg.

Definition at line 25 of file MEPP2VVPowheg.h.

Member Function Documentation

◆ CKM()

Complex Herwig::MEPP2VVPowheg::CKM ( int  ix,
int  iy 
) const
inline

Return the CKM matrix elements.

Definition at line 91 of file MEPP2VVPowheg.h.

References ckm_.

◆ clone()

virtual IBPtr Herwig::MEPP2VVPowheg::clone ( ) const
inlineprotectedvirtual

Make a simple clone of this object.

Returns
a pointer to the new object.

Reimplemented from Herwig::MEPP2VV.

Definition at line 349 of file MEPP2VVPowheg.h.

◆ doinit()

virtual void Herwig::MEPP2VVPowheg::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 Herwig::MEPP2VV.

◆ fullclone()

virtual IBPtr Herwig::MEPP2VVPowheg::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 Herwig::MEPP2VV.

Definition at line 355 of file MEPP2VVPowheg.h.

◆ generateHardest()

virtual RealEmissionProcessPtr Herwig::MEPP2VVPowheg::generateHardest ( RealEmissionProcessPtr  ,
ShowerInteraction  inter 
)
virtual

Apply the POWHEG style correction.

Reimplemented from Herwig::HwMEBase.

◆ generateKinematics()

virtual bool Herwig::MEPP2VVPowheg::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.

◆ getEvent()

bool Herwig::MEPP2VVPowheg::getEvent ( vector< Lorentz5Momentum > &  pnew,
unsigned int &  emissiontype 
)
protected

generates the hardest emission (yj,p)

Parameters
pnewThe momenta of the new particles
emissiontypeThe type of emission, as for getResult
Returns
Whether not an emission was generated

◆ getResult()

double Herwig::MEPP2VVPowheg::getResult ( int  emis_type,
realVVKinematics  R,
Energy  pT 
)
protected

Returns the matrix element for a given type of process, rapidity of the jet \(y_j\) and transverse momentum \(p_T\).

Parameters
emis_typethe type of emission, (0 is \(q\bar{q}\to Vg\), 1 is \(qg\to Vq\) and 2 is \(g\bar{q}\to V\bar{q}\))
pTThe transverse momentum of the jet
RThe object containing the kinematics

◆ hasPOWHEGCorrection()

virtual POWHEGType Herwig::MEPP2VVPowheg::hasPOWHEGCorrection ( )
inlinevirtual

Has a POWHEG style correction.

Reimplemented from Herwig::HwMEBase.

Definition at line 39 of file MEPP2VVPowheg.h.

◆ Init()

static void Herwig::MEPP2VVPowheg::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.

◆ lo_me()

double Herwig::MEPP2VVPowheg::lo_me ( bool  getMatrix) const
protected

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.

◆ M_V_regular()

double Herwig::MEPP2VVPowheg::M_V_regular ( realVVKinematics  S) const

The regular part of the virtual correction matrix element(s).

For WZ production this is given by Equation B.2 in NPB 383 (1992) 3-44 *** modulo a factor 1/(2s) ***, which is a flux factor that those authors absorb in the matrix element.

◆ M_V_regular_WW()

double Herwig::MEPP2VVPowheg::M_V_regular_WW ( realVVKinematics  S) const

M_V_regular_WW is the regular part of the one-loop WW matrix element exactly as defined in Eqs.

C.1 - C.7 of of NPB 410(1993)280-324 *** modulo a factor 1/(2s) ***, which is a flux factor that those authors absorb in the matrix element.

◆ M_V_regular_ZZ()

double Herwig::MEPP2VVPowheg::M_V_regular_ZZ ( realVVKinematics  S) const

M_V_regular_ZZ is the regular part of the one-loop ZZ matrix element exactly as defined in Eqs.

B.1 & B.2 of NPB 357(1991)409-438 *** modulo a factor 1/(2s) ***, which is a flux factor that those authors absorb in the matrix element.

◆ me2()

virtual double Herwig::MEPP2VVPowheg::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.

Reimplemented from Herwig::MEPP2VV.

◆ nDim()

virtual int Herwig::MEPP2VVPowheg::nDim ( ) const
virtual

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

Reimplemented from Herwig::HwMEBase.

◆ operator=()

MEPP2VVPowheg & Herwig::MEPP2VVPowheg::operator= ( const MEPP2VVPowheg )
privatedelete

The assignment operator is private and must never be called.

In fact, it should not even be implemented.

◆ persistentInput()

void Herwig::MEPP2VVPowheg::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::MEPP2VVPowheg::persistentOutput ( PersistentOStream os) const

Function used to write out object persistently.

Parameters
osthe persistent output stream written to.

◆ scale()

virtual Energy2 Herwig::MEPP2VVPowheg::scale ( ) const
virtual

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

Reimplemented from Herwig::MEPP2VV.

◆ setTheScales()

void Herwig::MEPP2VVPowheg::setTheScales ( Energy  pT)
protected

sets the QCD, EW and PDF scales

Parameters
pTThe pT of the current step in the veto algorithm

◆ t_u_M_R_qqb_WW()

Energy2 Herwig::MEPP2VVPowheg::t_u_M_R_qqb_WW ( realVVKinematics  R) const

t_u_M_R_qqb_WW is the q + qb -> n + g times tk*uk real emission matrix element as defined in Eq.

D.1-D.5 of NPB 410(1993)280-324 *** modulo a factor 1/(2s) ***, which is a flux factor that those authors absorb in the matrix element.

◆ t_u_M_R_qqb_ZZ()

Energy2 Herwig::MEPP2VVPowheg::t_u_M_R_qqb_ZZ ( realVVKinematics  R) const

t_u_M_R_qqb_ZZ is the q + qb -> n + g times tk*uk real emission matrix element as defined in Eq.

C.1 of NPB 357(1991)409-438 *** modulo a factor 1/(2s) ***, which is a flux factor that those authors absorb in the matrix element.

Member Data Documentation

◆ ab_

tcPDPtr Herwig::MEPP2VVPowheg::ab_
private

The ParticleData object for the plus and minus lo partons.

Definition at line 423 of file MEPP2VVPowheg.h.

◆ alphaS_

double Herwig::MEPP2VVPowheg::alphaS_
mutableprivate

The value of \(\alpha_S\) used for the calculation.

Definition at line 599 of file MEPP2VVPowheg.h.

◆ antiquark_

tcPDPtr Herwig::MEPP2VVPowheg::antiquark_
private

Definition at line 429 of file MEPP2VVPowheg.h.

◆ b0_

double Herwig::MEPP2VVPowheg::b0_
private

The QCD beta function divided by 4pi, (11-2/3*nf)/4/pi, with nf = 5.

Definition at line 734 of file MEPP2VVPowheg.h.

◆ B_

bornVVKinematics Herwig::MEPP2VVPowheg::B_
private

Born / virtual 2->2 kinematics.

Definition at line 388 of file MEPP2VVPowheg.h.

◆ bb_

tcPDPtr Herwig::MEPP2VVPowheg::bb_
private

Definition at line 423 of file MEPP2VVPowheg.h.

◆ CF_

double Herwig::MEPP2VVPowheg::CF_
private

The CF_ colour factor.

Definition at line 444 of file MEPP2VVPowheg.h.

◆ channel_

unsigned int Herwig::MEPP2VVPowheg::channel_
private

This specifies the emitting configuration: 1: q + qbar -> V1 + V2 + g 2: q + g -> V1 + V2 + q 3: g + qbar -> V1 + V2 + qbar.

Definition at line 693 of file MEPP2VVPowheg.h.

◆ channels_

unsigned int Herwig::MEPP2VVPowheg::channels_
private

Whether to generate all channels contributions or just qqb or just qg+gqb contributions.

Definition at line 498 of file MEPP2VVPowheg.h.

◆ children_

vector<PPtr> Herwig::MEPP2VVPowheg::children_
private

Definition at line 783 of file MEPP2VVPowheg.h.

◆ ckm_

vector< vector<Complex> > Herwig::MEPP2VVPowheg::ckm_
private

The ckm matrix elements (unsquared, to allow interference)

Definition at line 543 of file MEPP2VVPowheg.h.

Referenced by CKM().

◆ Cm_

realVVKinematics Herwig::MEPP2VVPowheg::Cm_
private

The collinear limit of the 2->3 kinematics (emission in -z direction).

Definition at line 413 of file MEPP2VVPowheg.h.

◆ contrib_

unsigned int Herwig::MEPP2VVPowheg::contrib_
private

Whether to generate the positive, negative or leading order contribution.

Definition at line 492 of file MEPP2VVPowheg.h.

◆ Cp_

realVVKinematics Herwig::MEPP2VVPowheg::Cp_
private

The collinear limit of the 2->3 kinematics (emission in +z direction).

Definition at line 408 of file MEPP2VVPowheg.h.

◆ EWScale_

Energy2 Herwig::MEPP2VVPowheg::EWScale_
private

Scale of electroweak vertices: mVV^2 the invariant mass of the diboson system.

Definition at line 821 of file MEPP2VVPowheg.h.

◆ eZ2_

double Herwig::MEPP2VVPowheg::eZ2_
mutableprivate

The TGC coupling squared.

This is useful for debugging purposes when one wants to turn of t-channel * TGC interference contributions but leave the pure TGC contributions intact. It is also needed in order to transform WZ matrix elements into WW ones.

Definition at line 482 of file MEPP2VVPowheg.h.

◆ eZ_

double Herwig::MEPP2VVPowheg::eZ_
mutableprivate

The TGC coupling.

Definition at line 474 of file MEPP2VVPowheg.h.

◆ fermionNumberOfMother_

int Herwig::MEPP2VVPowheg::fermionNumberOfMother_
private

Identifies the space-like mother of the branching as quark (+1) or antiquark (-1):

Definition at line 699 of file MEPP2VVPowheg.h.

◆ FFGvertex_

AbstractFFVVertexPtr Herwig::MEPP2VVPowheg::FFGvertex_
private

The quark-antiquark gluon vertex.

Definition at line 593 of file MEPP2VVPowheg.h.

◆ FFPvertex_

AbstractFFVVertexPtr Herwig::MEPP2VVPowheg::FFPvertex_
private

The vertices.

The photon fermion-antifermion vertex

Definition at line 573 of file MEPP2VVPowheg.h.

◆ FFWvertex_

AbstractFFVVertexPtr Herwig::MEPP2VVPowheg::FFWvertex_
private

The W fermion-antifermion vertex.

Definition at line 578 of file MEPP2VVPowheg.h.

◆ FFZvertex_

AbstractFFVVertexPtr Herwig::MEPP2VVPowheg::FFZvertex_
private

The Z fermion-antifermionvertex.

Definition at line 583 of file MEPP2VVPowheg.h.

◆ Fij2_

double Herwig::MEPP2VVPowheg::Fij2_
mutableprivate

The CKM factor (Fij^2)

Definition at line 487 of file MEPP2VVPowheg.h.

◆ fixed_alphaS_

double Herwig::MEPP2VVPowheg::fixed_alphaS_
private

The value of alphaS to use for the nlo weight if nlo_alphaS_opt_=1.

Definition at line 508 of file MEPP2VVPowheg.h.

◆ flipped_

bool Herwig::MEPP2VVPowheg::flipped_
private

Flag indicating if the q & qbar are flipped or not i.e.

this is true if q enters from the -z direction in the lab frame.

Definition at line 789 of file MEPP2VVPowheg.h.

◆ gdL_

double Herwig::MEPP2VVPowheg::gdL_
private

Definition at line 464 of file MEPP2VVPowheg.h.

◆ gdR_

double Herwig::MEPP2VVPowheg::gdR_
private

Definition at line 469 of file MEPP2VVPowheg.h.

◆ gluon_

PPtr Herwig::MEPP2VVPowheg::gluon_
private

Properties of the boson and jets.

Pointers to the Shower particle objects for the partons

Definition at line 780 of file MEPP2VVPowheg.h.

◆ gqb_hel_amps_

ProductionMatrixElement Herwig::MEPP2VVPowheg::gqb_hel_amps_
mutableprivate

The g + qb -> v1 + v2 + qb helicity amplitudes

Definition at line 563 of file MEPP2VVPowheg.h.

◆ guL_

double Herwig::MEPP2VVPowheg::guL_
mutableprivate

The up and down, left handed, quark-boson couplings.

Definition at line 464 of file MEPP2VVPowheg.h.

◆ guR_

double Herwig::MEPP2VVPowheg::guR_
mutableprivate

The up and down, right handed, quark-boson couplings (for WW & ZZ)

Definition at line 469 of file MEPP2VVPowheg.h.

◆ gW_

double Herwig::MEPP2VVPowheg::gW_
mutableprivate

The weak coupling and the sin (squared) of the Weinberg angle.

Definition at line 459 of file MEPP2VVPowheg.h.

◆ H_

realVVKinematics Herwig::MEPP2VVPowheg::H_
private

The resolved 2->3 real emission kinematics:

Definition at line 418 of file MEPP2VVPowheg.h.

◆ hadron_A_

tcBeamPtr Herwig::MEPP2VVPowheg::hadron_A_
private

The BeamParticleData object for the plus and minus direction hadrons.

Definition at line 382 of file MEPP2VVPowheg.h.

◆ hadron_B_

tcBeamPtr Herwig::MEPP2VVPowheg::hadron_B_
private

Definition at line 383 of file MEPP2VVPowheg.h.

◆ helicityConservation_

bool Herwig::MEPP2VVPowheg::helicityConservation_
private

Option to impose helicity conservation on the real NLO ME's (greatly improves evaluation time).

Definition at line 548 of file MEPP2VVPowheg.h.

◆ k1r_perp2_lab_

Energy2 Herwig::MEPP2VVPowheg::k1r_perp2_lab_
private

The pT of V1 in a radiative event in the lab frame (for scale setting only)

Definition at line 533 of file MEPP2VVPowheg.h.

◆ k2r_perp2_lab_

Energy2 Herwig::MEPP2VVPowheg::k2r_perp2_lab_
private

The pT of V2 in a radiative event in the lab frame (for scale setting only)

Definition at line 538 of file MEPP2VVPowheg.h.

◆ LambdaQCD_

Energy Herwig::MEPP2VVPowheg::LambdaQCD_
private

The fundamental QCD scale in the one-loop alpha_{S} used for the crude (not the very crude) overestimate of the Sudakov exponent.

The default value is set so such that alphaS(MZ), neglecting all flavour threshold effects i.e. MZ*exp(-1/2/b0_/alphaS(MZ)).

Definition at line 742 of file MEPP2VVPowheg.h.

◆ lo_lumi_

double Herwig::MEPP2VVPowheg::lo_lumi_
private

Values of the PDF's before radiation.

Definition at line 434 of file MEPP2VVPowheg.h.

◆ lo_me2_

double Herwig::MEPP2VVPowheg::lo_me2_
mutableprivate

The value of the leading order qqbar->VV matrix element.

Definition at line 439 of file MEPP2VVPowheg.h.

◆ lo_me_

double Herwig::MEPP2VVPowheg::lo_me_
private

The colour & spin averaged n-body (leading order) matrix element squared.

Definition at line 680 of file MEPP2VVPowheg.h.

◆ M_Born_

double Herwig::MEPP2VVPowheg::M_Born_
mutable

Member variable to store the Born matrix element as given in Equation 3.1 - 3.3 in NPB 383 (1992) *** modulo a factor 1/(2s) ***, which is a flux factor that those authors absorb in the matrix element.

Definition at line 283 of file MEPP2VVPowheg.h.

◆ M_V_regular_

double Herwig::MEPP2VVPowheg::M_V_regular_
mutable

Member variable to store the regular part of the virtual correction matrix element(s).

For WZ production this is given by Equation B.2 in NPB 383 (1992) 3-44 *** modulo a factor 1/(2s) ***, which is a flux factor that those authors absorb in the matrix element.

Definition at line 200 of file MEPP2VVPowheg.h.

◆ min_pT_

Energy Herwig::MEPP2VVPowheg::min_pT_
private

The transverse momentum of the jet.

Definition at line 805 of file MEPP2VVPowheg.h.

◆ mu_F_

Energy Herwig::MEPP2VVPowheg::mu_F_
private

The factorization scale.

Definition at line 523 of file MEPP2VVPowheg.h.

◆ mu_UV_

Energy Herwig::MEPP2VVPowheg::mu_UV_
private

The renormalization scale.

Definition at line 528 of file MEPP2VVPowheg.h.

◆ NC_

double Herwig::MEPP2VVPowheg::NC_
private

The number of colours.

Definition at line 454 of file MEPP2VVPowheg.h.

◆ nlo_alphaS_opt_

unsigned int Herwig::MEPP2VVPowheg::nlo_alphaS_opt_
private

Whether to use a fixed or a running QCD coupling for the NLO weight.

Definition at line 503 of file MEPP2VVPowheg.h.

◆ PDFScale_

Energy2 Herwig::MEPP2VVPowheg::PDFScale_
private

Scale for real emission PDF:

Definition at line 816 of file MEPP2VVPowheg.h.

◆ power_

double Herwig::MEPP2VVPowheg::power_
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 power, \(n\), for the sampling

Definition at line 714 of file MEPP2VVPowheg.h.

◆ prefactor_

vector<double> Herwig::MEPP2VVPowheg::prefactor_
private

The prefactors as a vector for easy use.

Definition at line 747 of file MEPP2VVPowheg.h.

◆ pregqbar_

double Herwig::MEPP2VVPowheg::pregqbar_
private

The prefactor, \(c\) for the \(g\bar{q}\) channel.

Definition at line 729 of file MEPP2VVPowheg.h.

◆ preqg_

double Herwig::MEPP2VVPowheg::preqg_
private

The prefactor, \(c\) for the \(qg\) channel.

Definition at line 724 of file MEPP2VVPowheg.h.

◆ preqqbar_

double Herwig::MEPP2VVPowheg::preqqbar_
private

The prefactor, \(c\) for the \(q\bar{q}\) channel.

Definition at line 719 of file MEPP2VVPowheg.h.

◆ productionMatrix_

Complex Herwig::MEPP2VVPowheg::productionMatrix_[3][3][3][3]
mutableprivate

A matrix to hold the home-grown production matrix element.

Definition at line 826 of file MEPP2VVPowheg.h.

◆ pT_

Energy Herwig::MEPP2VVPowheg::pT_
private

The transverse momentum of the jet.

Definition at line 799 of file MEPP2VVPowheg.h.

◆ qbHadron_

tcBeamPtr Herwig::MEPP2VVPowheg::qbHadron_
private

Definition at line 770 of file MEPP2VVPowheg.h.

◆ qbProgenitor_

PPtr Herwig::MEPP2VVPowheg::qbProgenitor_
private

Definition at line 758 of file MEPP2VVPowheg.h.

◆ QCDScale_

Energy2 Herwig::MEPP2VVPowheg::QCDScale_
private

Scale for alpha_S: pT^2 of the diboson system.

Definition at line 811 of file MEPP2VVPowheg.h.

◆ qg_hel_amps_

ProductionMatrixElement Herwig::MEPP2VVPowheg::qg_hel_amps_
mutableprivate

The q + g -> v1 + v2 + q helicity amplitudes

Definition at line 558 of file MEPP2VVPowheg.h.

◆ qHadron_

tcBeamPtr Herwig::MEPP2VVPowheg::qHadron_
private

Pointers to the BeamParticleData objects.

Definition at line 769 of file MEPP2VVPowheg.h.

◆ qProgenitor_

PPtr Herwig::MEPP2VVPowheg::qProgenitor_
private

Properties of the incoming particles.

Pointers to the ShowerProgenitor objects for the partons

Definition at line 757 of file MEPP2VVPowheg.h.

◆ qqb_hel_amps_

ProductionMatrixElement Herwig::MEPP2VVPowheg::qqb_hel_amps_
mutableprivate

The q + qb -> v1 + v2 + g helicity amplitudes

Definition at line 553 of file MEPP2VVPowheg.h.

◆ quark_

tcPDPtr Herwig::MEPP2VVPowheg::quark_
private

The ParticleData object for the quark and antiquark (which can be in a different order to ab_ and bb_).

Definition at line 429 of file MEPP2VVPowheg.h.

◆ R_

realVVKinematics Herwig::MEPP2VVPowheg::R_
private

The resolved 2->3 real emission kinematics.

Definition at line 685 of file MEPP2VVPowheg.h.

◆ realMESpinCorrelations_

bool Herwig::MEPP2VVPowheg::realMESpinCorrelations_
private

If this boolean is true the n+1 body helicity amplitudes will be used to calculate a hard vertex based on those kinematics for spin correlations in the decays.

Definition at line 675 of file MEPP2VVPowheg.h.

◆ removebr_

unsigned int Herwig::MEPP2VVPowheg::removebr_
private

Flag to remove or multiply in MCFM branching fractions for testing.

Definition at line 513 of file MEPP2VVPowheg.h.

◆ S_

realVVKinematics Herwig::MEPP2VVPowheg::S_
private

Soft limit of the 2->3 real emission kinematics.

Definition at line 393 of file MEPP2VVPowheg.h.

◆ scaleopt_

unsigned int Herwig::MEPP2VVPowheg::scaleopt_
private

Selects a dynamic (sHat) or fixed factorization scale.

Definition at line 518 of file MEPP2VVPowheg.h.

◆ SCm_

realVVKinematics Herwig::MEPP2VVPowheg::SCm_
private

The collinear limit of the 2->3 kinematics (emission in -z direction).

Definition at line 403 of file MEPP2VVPowheg.h.

◆ SCp_

realVVKinematics Herwig::MEPP2VVPowheg::SCp_
private

Soft-collinear limit of the 2->3 kinematics (emission in +z direction).

Definition at line 398 of file MEPP2VVPowheg.h.

◆ showerAlphaS_

ShowerAlphaPtr Herwig::MEPP2VVPowheg::showerAlphaS_
private

Pointer to the object calculating the strong coupling.

Definition at line 704 of file MEPP2VVPowheg.h.

◆ showerAntiquark_

PPtr Herwig::MEPP2VVPowheg::showerAntiquark_
private

Definition at line 764 of file MEPP2VVPowheg.h.

◆ showerQuark_

PPtr Herwig::MEPP2VVPowheg::showerQuark_
private

Pointers to the Shower particle objects for the partons.

Definition at line 763 of file MEPP2VVPowheg.h.

◆ sin2ThetaW_

double Herwig::MEPP2VVPowheg::sin2ThetaW_
private

Definition at line 459 of file MEPP2VVPowheg.h.

◆ t_u_M_R_gqb_

Energy2 Herwig::MEPP2VVPowheg::t_u_M_R_gqb_
mutable

Member variable to store the matrix element g + qb -> n + q times tk*uk.

Definition at line 230 of file MEPP2VVPowheg.h.

◆ t_u_M_R_gqb_hel_amp_

Energy2 Herwig::MEPP2VVPowheg::t_u_M_R_gqb_hel_amp_
mutable

Member variable to store the matrix element g + qb -> n + qb times (tk*uk)^2 - using helicity amplitudes.

Definition at line 263 of file MEPP2VVPowheg.h.

◆ t_u_M_R_qg_

Energy2 Herwig::MEPP2VVPowheg::t_u_M_R_qg_
mutable

Member variable to store the matrix element q + g -> n + q times tk*uk.

Definition at line 220 of file MEPP2VVPowheg.h.

◆ t_u_M_R_qg_hel_amp_

Energy2 Herwig::MEPP2VVPowheg::t_u_M_R_qg_hel_amp_
mutable

Member variable to store the matrix element q + g -> n + q times (tk*uk)^2 - using helicity amplitudes.

Definition at line 252 of file MEPP2VVPowheg.h.

◆ t_u_M_R_qqb_

Energy2 Herwig::MEPP2VVPowheg::t_u_M_R_qqb_
mutable

Member variable to store the matrix element q + qb -> n + g times tk*uk.

Definition at line 210 of file MEPP2VVPowheg.h.

◆ t_u_M_R_qqb_hel_amp_

Energy2 Herwig::MEPP2VVPowheg::t_u_M_R_qqb_hel_amp_
mutable

Member variable to store the matrix element q + qb -> n + g times (tk*uk)^2 - using helicity amplitudes.

Definition at line 241 of file MEPP2VVPowheg.h.

◆ tiny

double Herwig::MEPP2VVPowheg::tiny
private

Parameters for the NLO weight.

Parameter to determine when to use limiting value of real emission matrix elements, to avoid rounding error issues.

Definition at line 377 of file MEPP2VVPowheg.h.

◆ TR_

double Herwig::MEPP2VVPowheg::TR_
private

The TR_ colour factor.

Definition at line 449 of file MEPP2VVPowheg.h.

◆ V1_

PPtr Herwig::MEPP2VVPowheg::V1_
private

Definition at line 781 of file MEPP2VVPowheg.h.

◆ V2_

PPtr Herwig::MEPP2VVPowheg::V2_
private

Definition at line 782 of file MEPP2VVPowheg.h.

◆ WWWvertex_

AbstractVVVVertexPtr Herwig::MEPP2VVPowheg::WWWvertex_
private

The triple electroweak gauge boson vertex.

Definition at line 588 of file MEPP2VVPowheg.h.

◆ Yk_

double Herwig::MEPP2VVPowheg::Yk_
private

the rapidity of the jet

Definition at line 794 of file MEPP2VVPowheg.h.


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