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Herwig
7.2.1
MatrixElement
Powheg
MEqq2gZ2ffPowheg.h
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// -*- C++ -*-
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//
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// MEqq2gZ2ffPowheg.h is a part of Herwig - A multi-purpose Monte Carlo event generator
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// Copyright (C) 2002-2019 The Herwig Collaboration
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//
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// Herwig is licenced under version 3 of the GPL, see COPYING for details.
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// Please respect the MCnet academic guidelines, see GUIDELINES for details.
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//
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#ifndef HERWIG_MEqq2gZ2ffPowheg_H
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#define HERWIG_MEqq2gZ2ffPowheg_H
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//
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// This is the declaration of the MEqq2gZ2ffPowheg class.
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//
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#include "Herwig/MatrixElement/Hadron/MEqq2gZ2ff.h"
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#include "ThePEG/PDF/BeamParticleData.h"
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namespace
Herwig
{
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using namespace
ThePEG
;
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class
MEqq2gZ2ffPowheg
:
public
MEqq2gZ2ff
{
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public
:
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MEqq2gZ2ffPowheg
();
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virtual
Energy2 scale()
const
;
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virtual
int
nDim()
const
;
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virtual
bool
generateKinematics(
const
double
* r);
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virtual
CrossSection dSigHatDR()
const
;
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public
:
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void
persistentOutput(
PersistentOStream
& os)
const
;
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void
persistentInput(
PersistentIStream
& is,
int
version);
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static
void
Init();
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protected
:
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double
NLOweight()
const
;
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double
x(
double
xt,
double
v
)
const
;
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double
x_a(
double
x,
double
v)
const
;
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double
x_b(
double
x,
double
v)
const
;
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double
xbar(
double
v)
const
;
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double
Ltilde_qg(
double
x,
double
v)
const
;
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double
Ltilde_gq(
double
x,
double
v)
const
;
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double
Ltilde_qq(
double
x,
double
v)
const
;
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double
Vtilde_qq()
const
;
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double
Ccalbar_qg(
double
x)
const
;
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double
Fcal_qg(
double
x,
double
v)
const
;
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double
Fcal_gq(
double
x,
double
v)
const
;
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double
Fcal_qq(
double
x,
double
v)
const
;
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double
Ftilde_qg(
double
xt,
double
v)
const
;
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double
Ftilde_gq(
double
xt,
double
v)
const
;
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double
Ftilde_qq(
double
xt,
double
v)
const
;
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double
Ctilde_qg(
double
x,
double
v)
const
;
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double
Ctilde_gq(
double
x,
double
v)
const
;
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double
Ctilde_qq(
double
x,
double
v)
const
;
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protected
:
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virtual
IBPtr
clone
()
const
{
return
new_ptr(*
this
); }
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virtual
IBPtr
fullclone
()
const
{
return
new_ptr(*
this
); }
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protected
:
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virtual
void
doinit();
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private
:
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MEqq2gZ2ffPowheg
& operator=(
const
MEqq2gZ2ffPowheg
&) =
delete
;
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private
:
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mutable
double
_xb_a
;
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mutable
double
_xb_b
;
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mutable
tcPDPtr
_parton_a
;
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mutable
tcPDPtr
_parton_b
;
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mutable
Ptr<BeamParticleData>::transient_const_pointer
_hadron_A
;
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mutable
Ptr<BeamParticleData>::transient_const_pointer
_hadron_B
;
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tcPDPtr
_gluon
;
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const
double
TR_
;
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const
double
CF_
;
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mutable
double
_alphaS2Pi
;
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mutable
Energy2
_mll2
;
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mutable
Energy2
_mu2
;
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unsigned
int
_contrib
;
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unsigned
int
_nlo_alphaS_opt
;
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double
_fixed_alphaS
;
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double
_a
;
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double
_p
;
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double
_eps
;
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unsigned
int
_scaleopt
;
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Energy
_fixedScale
;
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double
_scaleFact
;
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double
_xt
;
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double
_v
;
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mutable
double
_oldq
;
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mutable
double
_oldqbar
;
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};
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}
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#endif
/* HERWIG_MEqq2gZ2ffPowheg_H */
ThePEG::PersistentIStream
Herwig::MEqq2gZ2ffPowheg::_fixed_alphaS
double _fixed_alphaS
The value of alphaS to use for the nlo weight if _nloalphaSopt=1.
Definition:
MEqq2gZ2ffPowheg.h:305
Herwig::MEqq2gZ2ffPowheg::_contrib
unsigned int _contrib
Parameters for the NLO weight.
Definition:
MEqq2gZ2ffPowheg.h:295
Herwig::MEqq2gZ2ffPowheg::_hadron_A
Ptr< BeamParticleData >::transient_const_pointer _hadron_A
The BeamParticleData object for the first hadron.
Definition:
MEqq2gZ2ffPowheg.h:251
Herwig::MEqq2gZ2ffPowheg::_a
double _a
The magnitude of the correction term to reduce the negative contribution.
Definition:
MEqq2gZ2ffPowheg.h:310
Herwig::MEqq2gZ2ffPowheg::_scaleFact
double _scaleFact
Prefactor if variable scale used.
Definition:
MEqq2gZ2ffPowheg.h:340
Herwig::MEqq2gZ2ffPowheg::_scaleopt
unsigned int _scaleopt
Choice of the scale.
Definition:
MEqq2gZ2ffPowheg.h:330
Herwig::MEqq2gZ2ffPowheg::clone
virtual IBPtr clone() const
Make a simple clone of this object.
Definition:
MEqq2gZ2ffPowheg.h:197
Herwig::MEqq2gZ2ffPowheg::fullclone
virtual IBPtr fullclone() const
Make a clone of this object, possibly modifying the cloned object to make it sane.
Definition:
MEqq2gZ2ffPowheg.h:203
Herwig::MEqq2gZ2ffPowheg::_hadron_B
Ptr< BeamParticleData >::transient_const_pointer _hadron_B
The BeamParticleData object for the second hadron.
Definition:
MEqq2gZ2ffPowheg.h:256
Herwig::MEqq2gZ2ffPowheg::_xb_a
double _xb_a
The momentum fraction of the first parton in the Born process.
Definition:
MEqq2gZ2ffPowheg.h:231
ThePEG::PersistentOStream
ThePEG::IBPtr
ThePEG::Ptr< InterfacedBase >::pointer IBPtr
Herwig::MEqq2gZ2ffPowheg
The MEqq2gZ2ffPowheg class implements the products of Standard Model fermion antifermion pairs via th...
Definition:
MEqq2gZ2ffPowheg.h:29
ThePEG
Herwig::MEqq2gZ2ffPowheg::_v
double _v
The angular variable.
Definition:
MEqq2gZ2ffPowheg.h:355
Herwig::MEqq2gZ2ffPowheg::_mu2
Energy2 _mu2
The renormalization/factorization scale.
Definition:
MEqq2gZ2ffPowheg.h:286
Herwig::MEqq2gZ2ffPowheg::_fixedScale
Energy _fixedScale
Fixed scale if used.
Definition:
MEqq2gZ2ffPowheg.h:335
Herwig::MEqq2gZ2ffPowheg::_oldq
double _oldq
Values of the PDF's before radiation.
Definition:
MEqq2gZ2ffPowheg.h:365
Herwig::MEqq2gZ2ff
The MEqq2gZ2ff class implements the products of Standard Model fermion antifermion pairs via the res...
Definition:
MEqq2gZ2ff.h:34
ThePEG::tcPDPtr
ThePEG::Ptr< ParticleData >::transient_const_pointer tcPDPtr
Herwig::MEqq2gZ2ffPowheg::_mll2
Energy2 _mll2
The mass squared of the lepton pair.
Definition:
MEqq2gZ2ffPowheg.h:281
Herwig::MEqq2gZ2ffPowheg::_gluon
tcPDPtr _gluon
the ParticleData object for the gluon
Definition:
MEqq2gZ2ffPowheg.h:261
SpinorType::v
Herwig::MEqq2gZ2ffPowheg::_alphaS2Pi
double _alphaS2Pi
The value of used for the calculation.
Definition:
MEqq2gZ2ffPowheg.h:276
Herwig
-*- C++ -*-
Definition:
BasicConsistency.h:17
Herwig::MEqq2gZ2ffPowheg::_parton_a
tcPDPtr _parton_a
The ParticleData object for the first parton in the Born process.
Definition:
MEqq2gZ2ffPowheg.h:241
Herwig::MEqq2gZ2ffPowheg::TR_
const double TR_
The colour factor.
Definition:
MEqq2gZ2ffPowheg.h:266
Herwig::MEqq2gZ2ffPowheg::CF_
const double CF_
The colour factor.
Definition:
MEqq2gZ2ffPowheg.h:271
Herwig::MEqq2gZ2ffPowheg::_nlo_alphaS_opt
unsigned int _nlo_alphaS_opt
Whether to use a fixed or a running QCD coupling for the NLO weight.
Definition:
MEqq2gZ2ffPowheg.h:300
Herwig::MEqq2gZ2ffPowheg::_eps
double _eps
Cut-off for the correction function.
Definition:
MEqq2gZ2ffPowheg.h:320
Herwig::MEqq2gZ2ffPowheg::_oldqbar
double _oldqbar
For the antiquark.
Definition:
MEqq2gZ2ffPowheg.h:370
Herwig::MEqq2gZ2ffPowheg::_xb_b
double _xb_b
The momentum fraction of the second parton in the Born process.
Definition:
MEqq2gZ2ffPowheg.h:236
Herwig::MEqq2gZ2ffPowheg::_p
double _p
The power of the correction term to reduce the negative contribution.
Definition:
MEqq2gZ2ffPowheg.h:315
Herwig::MEqq2gZ2ffPowheg::_xt
double _xt
Radiation variables.
Definition:
MEqq2gZ2ffPowheg.h:350
Herwig::MEqq2gZ2ffPowheg::_parton_b
tcPDPtr _parton_b
The ParticleData object for the second parton in the Born process.
Definition:
MEqq2gZ2ffPowheg.h:246
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