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Herwig
7.2.1
MatrixElement
Matchbox
Matching
ShowerApproximation.h
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// -*- C++ -*-
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//
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// ShowerApproximation.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_ShowerApproximation_H
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#define Herwig_ShowerApproximation_H
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//
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// This is the declaration of the ShowerApproximation class.
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//
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#include "ThePEG/Handlers/HandlerBase.h"
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#include "ThePEG/Handlers/StandardXComb.h"
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#include "Herwig/MatrixElement/Matchbox/Dipoles/SubtractionDipole.fh"
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#include "Herwig/MatrixElement/Matchbox/Utility/ColourBasis.h"
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#include "Herwig/MatrixElement/Matchbox/Phasespace/TildeKinematics.fh"
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#include "Herwig/MatrixElement/Matchbox/Phasespace/InvertedTildeKinematics.fh"
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#include "HardScaleProfile.h"
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namespace
Herwig
{
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using namespace
ThePEG
;
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class
ShowerApproximation
:
public
HandlerBase
{
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public
:
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ShowerApproximation
();
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virtual
~
ShowerApproximation
();
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public
:
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virtual
bool
needsSplittingGenerator
()
const
{
return
false
; }
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virtual
bool
hasHEvents
()
const
{
return
true
; }
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70
virtual
bool
needsTildeXCombs
()
const
{
return
false
; }
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virtual
bool
needsTruncatedShower
()
const
{
return
false
; }
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virtual
Ptr<TildeKinematics>::tptr showerTildeKinematics()
const
;
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virtual
Ptr<InvertedTildeKinematics>::tptr showerInvertedTildeKinematics()
const
;
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public
:
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void
setBornXComb
(tStdXCombPtr xc) { theBornXComb = xc; }
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tStdXCombPtr
bornXComb
()
const
{
return
theBornXComb; }
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107
tcStdXCombPtr
bornCXComb
()
const
{
return
theBornXComb; }
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void
setRealXComb
(tStdXCombPtr xc) { theRealXComb = xc; }
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tStdXCombPtr
realXComb
()
const
{
return
theRealXComb; }
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tcStdXCombPtr
realCXComb
()
const
{
return
theRealXComb; }
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void
setTildeXCombs
(
const
vector<StdXCombPtr>& xc) { theTildeXCombs = xc; }
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const
vector<StdXCombPtr>&
tildeXCombs
()
const
{
return
theTildeXCombs; }
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void
setDipole(Ptr<SubtractionDipole>::tptr);
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Ptr<SubtractionDipole>::tptr dipole()
const
;
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virtual
bool
hasSpinCorrelations
()
const
{
return
false
; }
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public
:
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bool
belowCutoff
()
const
{
return
theBelowCutoff; }
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void
wasBelowCutoff
() { theBelowCutoff =
true
; }
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void
resetBelowCutoff
() { theBelowCutoff =
false
; }
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Energy
ffPtCut
()
const
{
return
theFFPtCut; }
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Energy
fiPtCut
()
const
{
return
theFIPtCut; }
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Energy
iiPtCut
()
const
{
return
theIIPtCut; }
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Energy
safeCut
()
const
{
return
theSafeCut;}
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Energy
ffScreeningScale
()
const
{
return
theFFScreeningScale; }
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Energy
fiScreeningScale
()
const
{
return
theFIScreeningScale; }
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Energy
iiScreeningScale
()
const
{
return
theIIScreeningScale; }
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virtual
Energy2 showerEmissionScale()
const
;
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Energy2
showerRenormalizationScale
()
const
{
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return
sqr
(renormalizationScaleFactor())*showerEmissionScale();
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}
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Energy2
showerFactorizationScale
()
const
{
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return
sqr
(factorizationScaleFactor())*showerEmissionScale();
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}
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Energy2 bornRenormalizationScale()
const
;
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Energy2 bornFactorizationScale()
const
;
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Energy2 realRenormalizationScale()
const
;
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Energy2 realFactorizationScale()
const
;
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enum
ScaleChoices
{
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bornScale = 0,
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realScale = 1,
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showerScale = 2
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};
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int
realEmissionScaleInSubtraction
()
const
{
return
theRealEmissionScaleInSubtraction; }
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int
bornScaleInSubtraction
()
const
{
return
theBornScaleInSubtraction; }
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int
emissionScaleInSubtraction
()
const
{
return
theEmissionScaleInSubtraction; }
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int
realEmissionScaleInSplitting
()
const
{
return
theRealEmissionScaleInSplitting; }
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int
bornScaleInSplitting
()
const
{
return
theBornScaleInSplitting; }
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int
emissionScaleInSplitting
()
const
{
return
theEmissionScaleInSplitting; }
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double
scaleWeight(
int
rScale,
int
bScale,
int
eScale)
const
;
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double
subtractionScaleWeight
()
const
{
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return
scaleWeight(realEmissionScaleInSubtraction(),
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bornScaleInSubtraction(),
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emissionScaleInSubtraction());
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}
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double
splittingScaleWeight
()
const
{
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return
scaleWeight(realEmissionScaleInSplitting(),
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bornScaleInSplitting(),
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emissionScaleInSplitting());
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}
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public
:
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bool
restrictPhasespace
()
const
{
return
theRestrictPhasespace; }
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void
restrictPhasespace
(
bool
yes) { theRestrictPhasespace = yes; }
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Ptr<HardScaleProfile>::tptr
profileScales
()
const
{
return
theHardScaleProfile; }
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void
profileScales
(Ptr<HardScaleProfile>::ptr prof) { theHardScaleProfile = prof; }
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bool
hardScaleIsMuF
()
const
{
return
maxPtIsMuF; }
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void
hardScaleIsMuF
(
bool
yes) { maxPtIsMuF = yes; }
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double
hardScaleFactor
()
const
{
return
theHardScaleFactor; }
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void
hardScaleFactor
(
double
f) { theHardScaleFactor = f; }
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double
factorizationScaleFactor
()
const
{
return
theFactorizationScaleFactor; }
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double
renormalizationScaleFactor
()
const
{
return
theRenormalizationScaleFactor; }
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void
factorizationScaleFactor
(
double
f) { theFactorizationScaleFactor = f; }
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379
void
renormalizationScaleFactor
(
double
f) { theRenormalizationScaleFactor = f; }
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virtual
void
checkCutoff();
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virtual
void
getShowerVariables();
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virtual
CrossSection dSigHatDR()
const
= 0;
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virtual
double
me2()
const
= 0;
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double
bornPDFWeight(Energy2 muF)
const
;
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double
realPDFWeight(Energy2 muF)
const
;
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protected
:
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virtual
bool
isInShowerPhasespace()
const
;
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virtual
bool
isAboveCutoff()
const
;
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virtual
Energy hardScale()
const
;
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void
useOpenZ
(
bool
yes) { theOpenZ = yes; }
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bool
openZ
()
const
{
return
theOpenZ; }
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public
:
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virtual
double
channelWeight(
int
emitter,
int
emission,
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int
spectator,
int
bemitter)
const
;
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virtual
double
channelWeight()
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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virtual
void
doinit();
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// If needed, insert declarations of virtual function defined in the
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// InterfacedBase class here (using ThePEG-interfaced-decl in Emacs).
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public
:
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Ptr<ColourBasis>::tptr
largeNBasis
()
const
{
return
theLargeNBasis; }
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protected
:
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519
Ptr<ColourBasis>::ptr
theLargeNBasis
;
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void
setLargeNBasis();
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double
theExtrapolationX
;
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531
private
:
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536
tStdXCombPtr
theBornXComb
;
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tStdXCombPtr
theRealXComb
;
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vector<StdXCombPtr>
theTildeXCombs
;
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Ptr<SubtractionDipole>::tptr
theDipole
;
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bool
theBelowCutoff
;
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562
Energy
theFFPtCut
;
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568
Energy
theFFScreeningScale
;
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573
Energy
theFIPtCut
;
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579
Energy
theFIScreeningScale
;
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584
Energy
theIIPtCut
;
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Energy
theIIScreeningScale
;
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595
Energy
theSafeCut
;
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bool
theRestrictPhasespace
;
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double
theHardScaleFactor
;
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611
double
theRenormalizationScaleFactor
;
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616
double
theFactorizationScaleFactor
;
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622
int
theRealEmissionScaleInSubtraction
;
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628
int
theBornScaleInSubtraction
;
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634
int
theEmissionScaleInSubtraction
;
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640
int
theRealEmissionScaleInSplitting
;
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646
int
theBornScaleInSplitting
;
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652
int
theEmissionScaleInSplitting
;
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657
Energy
theRenormalizationScaleFreeze
;
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662
Energy
theFactorizationScaleFreeze
;
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bool
maxPtIsMuF
;
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Ptr<HardScaleProfile>::ptr
theHardScaleProfile
;
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bool
theOpenZ
;
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private
:
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ShowerApproximation
& operator=(
const
ShowerApproximation
&) =
delete
;
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};
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}
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#endif
/* Herwig_ShowerApproximation_H */
ThePEG::PersistentIStream
Herwig::ShowerApproximation::maxPtIsMuF
bool maxPtIsMuF
True if maximum pt should be deduced from the factorization scale.
Definition:
ShowerApproximation.h:667
Herwig::ShowerApproximation::theExtrapolationX
double theExtrapolationX
The x value from which on we extrapolate PDFs for numerically stable ratios.
Definition:
ShowerApproximation.h:529
Herwig::ShowerApproximation::hardScaleFactor
double hardScaleFactor() const
Return the scale factor for the hard scale.
Definition:
ShowerApproximation.h:354
Herwig::ShowerApproximation::profileScales
void profileScales(Ptr< HardScaleProfile >::ptr prof)
Set profile scales.
Definition:
ShowerApproximation.h:339
Herwig::ShowerApproximation::bornCXComb
tcStdXCombPtr bornCXComb() const
Return the XComb object describing the Born process.
Definition:
ShowerApproximation.h:107
Herwig::ShowerApproximation::subtractionScaleWeight
double subtractionScaleWeight() const
Return the scale weight for the matching subtraction.
Definition:
ShowerApproximation.h:302
Herwig::ShowerApproximation::realXComb
tStdXCombPtr realXComb() const
Return the XComb object describing the real emission process.
Definition:
ShowerApproximation.h:117
Herwig::ShowerApproximation::bornScaleInSubtraction
int bornScaleInSubtraction() const
Return the scale choice in the born cross section to be used in the matching subtraction.
Definition:
ShowerApproximation.h:268
Herwig::ShowerApproximation::theTildeXCombs
vector< StdXCombPtr > theTildeXCombs
The tilde xcomb objects associated to the real xcomb.
Definition:
ShowerApproximation.h:546
Herwig::ShowerApproximation::hardScaleIsMuF
bool hardScaleIsMuF() const
Return true if maximum pt should be deduced from the factorization scale.
Definition:
ShowerApproximation.h:344
Herwig::ShowerApproximation::theRealEmissionScaleInSubtraction
int theRealEmissionScaleInSubtraction
The scale choice in the real emission cross section to be used in the matching subtraction.
Definition:
ShowerApproximation.h:622
Herwig::ShowerApproximation::theBornXComb
tStdXCombPtr theBornXComb
The XComb object describing the Born process.
Definition:
ShowerApproximation.h:536
Herwig::ShowerApproximation::theDipole
Ptr< SubtractionDipole >::tptr theDipole
The dipole in charge for the emission.
Definition:
ShowerApproximation.h:551
Herwig::ShowerApproximation::theFFPtCut
Energy theFFPtCut
The pt cut to be applied for final-final dipoles.
Definition:
ShowerApproximation.h:562
Herwig::ShowerApproximation
ShowerApproximation describes the shower emission to be used in NLO matching.
Definition:
ShowerApproximation.h:35
ThePEG::PersistentOStream
Herwig::ShowerApproximation::realEmissionScaleInSubtraction
int realEmissionScaleInSubtraction() const
Return the scale choice in the real emission cross section to be used in the matching subtraction...
Definition:
ShowerApproximation.h:262
Herwig::ShowerApproximation::setTildeXCombs
void setTildeXCombs(const vector< StdXCombPtr > &xc)
Set the tilde xcomb objects associated to the real xcomb.
Definition:
ShowerApproximation.h:127
Herwig::ShowerApproximation::showerRenormalizationScale
Energy2 showerRenormalizationScale() const
Return the shower renormalization scale.
Definition:
ShowerApproximation.h:211
Herwig::ShowerApproximation::needsTildeXCombs
virtual bool needsTildeXCombs() const
Return true, if this shower approximation will require tilde XCombs for the real phase space point ge...
Definition:
ShowerApproximation.h:70
Herwig::ShowerApproximation::hasSpinCorrelations
virtual bool hasSpinCorrelations() const
Return true, if this matching is capable of spin correlations.
Definition:
ShowerApproximation.h:147
Herwig::ShowerApproximation::theFIPtCut
Energy theFIPtCut
The pt cut to be applied for final-initial dipoles.
Definition:
ShowerApproximation.h:573
sqr
constexpr auto sqr(const T &x) -> decltype(x *x)
Herwig::ShowerApproximation::resetBelowCutoff
void resetBelowCutoff()
Reset the below cutoff flag.
Definition:
ShowerApproximation.h:166
Herwig::ShowerApproximation::factorizationScaleFactor
void factorizationScaleFactor(double f)
Set the factorization scale factor.
Definition:
ShowerApproximation.h:374
Herwig::ShowerApproximation::theBornScaleInSubtraction
int theBornScaleInSubtraction
The scale choice in the born cross section to be used in the matching subtraction.
Definition:
ShowerApproximation.h:628
Herwig::ShowerApproximation::realCXComb
tcStdXCombPtr realCXComb() const
Return the XComb object describing the real emission process.
Definition:
ShowerApproximation.h:122
ThePEG
Herwig::ShowerApproximation::belowCutoff
bool belowCutoff() const
Return true if one of the recently encountered configutations was below the infrared cutoff...
Definition:
ShowerApproximation.h:155
Herwig::ShowerApproximation::renormalizationScaleFactor
void renormalizationScaleFactor(double f)
Set the renormalization scale factor.
Definition:
ShowerApproximation.h:379
Herwig::ShowerApproximation::factorizationScaleFactor
double factorizationScaleFactor() const
Get the factorization scale factor.
Definition:
ShowerApproximation.h:364
Herwig::ShowerApproximation::splittingScaleWeight
double splittingScaleWeight() const
Return the scale weight for the splitting.
Definition:
ShowerApproximation.h:311
Herwig::ShowerApproximation::useOpenZ
void useOpenZ(bool yes)
Use the maximum available phase space for the momentum fraction.
Definition:
ShowerApproximation.h:441
Herwig::ShowerApproximation::tildeXCombs
const vector< StdXCombPtr > & tildeXCombs() const
Return the tilde xcomb objects associated to the real xcomb.
Definition:
ShowerApproximation.h:132
Herwig::ShowerApproximation::safeCut
Energy safeCut() const
Return the pt cut to be applied for initial-initial dipoles.
Definition:
ShowerApproximation.h:186
Herwig::ShowerApproximation::theLargeNBasis
Ptr< ColourBasis >::ptr theLargeNBasis
A large-N colour basis to be used when reproducing the shower kernels.
Definition:
ShowerApproximation.h:519
Herwig::ShowerApproximation::theBornScaleInSplitting
int theBornScaleInSplitting
The scale choice in the born cross section to be used in the splitting.
Definition:
ShowerApproximation.h:646
Herwig::ShowerApproximation::emissionScaleInSplitting
int emissionScaleInSplitting() const
Return the scale choice in the emission contribution to be used in the splitting. ...
Definition:
ShowerApproximation.h:292
Herwig::ShowerApproximation::hasHEvents
virtual bool hasHEvents() const
Return true, if this shower approximation will require H events.
Definition:
ShowerApproximation.h:64
Herwig::ShowerApproximation::realEmissionScaleInSplitting
int realEmissionScaleInSplitting() const
Return the scale choice in the real emission cross section to be used in the splitting.
Definition:
ShowerApproximation.h:280
Herwig::ShowerApproximation::theRenormalizationScaleFactor
double theRenormalizationScaleFactor
The scale factor for the renormalization scale.
Definition:
ShowerApproximation.h:611
Herwig::ShowerApproximation::theFactorizationScaleFactor
double theFactorizationScaleFactor
The scale factor for the factorization scale.
Definition:
ShowerApproximation.h:616
Herwig::ShowerApproximation::ffScreeningScale
Energy ffScreeningScale() const
Return the screening scale to be applied for final-final dipoles.
Definition:
ShowerApproximation.h:191
Herwig::ShowerApproximation::setRealXComb
void setRealXComb(tStdXCombPtr xc)
Set the XComb object describing the real emission process.
Definition:
ShowerApproximation.h:112
Herwig::ShowerApproximation::theIIScreeningScale
Energy theIIScreeningScale
An optional screening scale for initial-initial dipoles; see DipoleSplittingKernel.
Definition:
ShowerApproximation.h:590
Herwig::ShowerApproximation::wasBelowCutoff
void wasBelowCutoff()
Indicate that one of the recently encountered configutations was below the infrared cutoff...
Definition:
ShowerApproximation.h:161
Herwig::ShowerApproximation::restrictPhasespace
bool restrictPhasespace() const
Return true, if the phase space restrictions of the dipole shower should be applied.
Definition:
ShowerApproximation.h:323
Herwig::ShowerApproximation::theHardScaleFactor
double theHardScaleFactor
The scale factor for the hard scale.
Definition:
ShowerApproximation.h:606
Herwig::ShowerApproximation::fiPtCut
Energy fiPtCut() const
Return the pt cut to be applied for final-initial dipoles.
Definition:
ShowerApproximation.h:176
Herwig::ShowerApproximation::bornXComb
tStdXCombPtr bornXComb() const
Return the XComb object describing the Born process.
Definition:
ShowerApproximation.h:102
Herwig::ShowerApproximation::setBornXComb
void setBornXComb(tStdXCombPtr xc)
Set the XComb object describing the Born process.
Definition:
ShowerApproximation.h:97
Herwig::ShowerApproximation::theRestrictPhasespace
bool theRestrictPhasespace
True, if the phase space restrictions of the dipole shower should be applied.
Definition:
ShowerApproximation.h:601
Herwig::ShowerApproximation::iiScreeningScale
Energy iiScreeningScale() const
Return the screening scale to be applied for initial-initial dipoles.
Definition:
ShowerApproximation.h:201
Herwig::ShowerApproximation::theBelowCutoff
bool theBelowCutoff
True if one of the recently encountered configutations was below the infrared cutoff.
Definition:
ShowerApproximation.h:557
Herwig::ShowerApproximation::restrictPhasespace
void restrictPhasespace(bool yes)
Indicate that the phase space restrictions of the dipole shower should be applied.
Definition:
ShowerApproximation.h:329
ThePEG::HandlerBase
Herwig::ShowerApproximation::largeNBasis
Ptr< ColourBasis >::tptr largeNBasis() const
A large-N colour basis to be used when reproducing the shower kernels.
Definition:
ShowerApproximation.h:511
Herwig::ShowerApproximation::hardScaleFactor
void hardScaleFactor(double f)
Set the scale factor for the hard scale.
Definition:
ShowerApproximation.h:359
Herwig::ShowerApproximation::iiPtCut
Energy iiPtCut() const
Return the pt cut to be applied for initial-initial dipoles.
Definition:
ShowerApproximation.h:181
Herwig::ShowerApproximation::hardScaleIsMuF
void hardScaleIsMuF(bool yes)
Indicate that maximum pt should be deduced from the factorization scale.
Definition:
ShowerApproximation.h:349
Herwig::ShowerApproximation::theSafeCut
Energy theSafeCut
The cut to be applied as an enhanced shower cutoff.
Definition:
ShowerApproximation.h:595
Herwig::ShowerApproximation::theOpenZ
bool theOpenZ
Use the maximum available phase space for the momentum fraction.
Definition:
ShowerApproximation.h:677
Herwig::ShowerApproximation::profileScales
Ptr< HardScaleProfile >::tptr profileScales() const
Return profile scales.
Definition:
ShowerApproximation.h:334
Herwig::ShowerApproximation::theRenormalizationScaleFreeze
Energy theRenormalizationScaleFreeze
A freezing value for the renormalization scale.
Definition:
ShowerApproximation.h:657
Herwig::ShowerApproximation::theFFScreeningScale
Energy theFFScreeningScale
An optional screening scale for final-final dipoles; see DipoleSplittingKernel.
Definition:
ShowerApproximation.h:568
Herwig
-*- C++ -*-
Definition:
BasicConsistency.h:17
Herwig::ShowerApproximation::showerFactorizationScale
Energy2 showerFactorizationScale() const
Return the shower factorization scale.
Definition:
ShowerApproximation.h:218
Herwig::ShowerApproximation::bornScaleInSplitting
int bornScaleInSplitting() const
Return the scale choice in the born cross section to be used in the splitting.
Definition:
ShowerApproximation.h:286
Herwig::ShowerApproximation::ffPtCut
Energy ffPtCut() const
Return the pt cut to be applied for final-final dipoles.
Definition:
ShowerApproximation.h:171
Herwig::ShowerApproximation::theEmissionScaleInSubtraction
int theEmissionScaleInSubtraction
The scale choice in the emission contribution to be used in the matching subtraction.
Definition:
ShowerApproximation.h:634
Herwig::ShowerApproximation::theIIPtCut
Energy theIIPtCut
The pt cut to be applied for initial-initial dipoles.
Definition:
ShowerApproximation.h:584
Herwig::ShowerApproximation::theHardScaleProfile
Ptr< HardScaleProfile >::ptr theHardScaleProfile
The profile scales.
Definition:
ShowerApproximation.h:672
Herwig::ShowerApproximation::theFIScreeningScale
Energy theFIScreeningScale
An optional screening scale for final-initial dipoles; see DipoleSplittingKernel. ...
Definition:
ShowerApproximation.h:579
Herwig::ShowerApproximation::renormalizationScaleFactor
double renormalizationScaleFactor() const
Get the renormalization scale factor.
Definition:
ShowerApproximation.h:369
Herwig::ShowerApproximation::theRealEmissionScaleInSplitting
int theRealEmissionScaleInSplitting
The scale choice in the real emission cross section to be used in the splitting.
Definition:
ShowerApproximation.h:640
Herwig::ShowerApproximation::theRealXComb
tStdXCombPtr theRealXComb
The XComb object describing the real emission process.
Definition:
ShowerApproximation.h:541
Herwig::ShowerApproximation::emissionScaleInSubtraction
int emissionScaleInSubtraction() const
Return the scale choice in the emission contribution to be used in the matching subtraction.
Definition:
ShowerApproximation.h:274
Herwig::ShowerApproximation::theEmissionScaleInSplitting
int theEmissionScaleInSplitting
The scale choice in the emission contribution to be used in the splitting.
Definition:
ShowerApproximation.h:652
Herwig::ShowerApproximation::theFactorizationScaleFreeze
Energy theFactorizationScaleFreeze
A freezing value for the factorization scale.
Definition:
ShowerApproximation.h:662
Herwig::ShowerApproximation::needsSplittingGenerator
virtual bool needsSplittingGenerator() const
Return true, if this shower approximation will require a splitting generator.
Definition:
ShowerApproximation.h:58
Herwig::ShowerApproximation::fiScreeningScale
Energy fiScreeningScale() const
Return the screening scale to be applied for final-initial dipoles.
Definition:
ShowerApproximation.h:196
Herwig::ShowerApproximation::ScaleChoices
ScaleChoices
Enumerate possible scale choices.
Definition:
ShowerApproximation.h:245
Herwig::ShowerApproximation::needsTruncatedShower
virtual bool needsTruncatedShower() const
Return true, if this shower approximation will require a truncated parton shower. ...
Definition:
ShowerApproximation.h:76
Herwig::ShowerApproximation::openZ
bool openZ() const
Return true if the maximum available phase space should be used for the momentum fraction.
Definition:
ShowerApproximation.h:447
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