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diff --git a/MatrixElement/Matchbox/Matching/ShowerApproximation.cc b/MatrixElement/Matchbox/Matching/ShowerApproximation.cc
--- a/MatrixElement/Matchbox/Matching/ShowerApproximation.cc
+++ b/MatrixElement/Matchbox/Matching/ShowerApproximation.cc
@@ -1,679 +1,679 @@
// -*- C++ -*-
//
// ShowerApproximation.cc is a part of Herwig++ - A multi-purpose Monte Carlo event generator
// Copyright (C) 2002-2012 The Herwig Collaboration
//
// Herwig++ is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
//
// This is the implementation of the non-inlined, non-templated member
// functions of the ShowerApproximation class.
//
#include "ShowerApproximation.h"
#include "ThePEG/Interface/ClassDocumentation.h"
#include "ThePEG/Interface/Switch.h"
#include "ThePEG/Interface/Reference.h"
#include "ThePEG/Interface/Parameter.h"
#include "ThePEG/EventRecord/Particle.h"
#include "ThePEG/Repository/UseRandom.h"
#include "ThePEG/Repository/EventGenerator.h"
#include "ThePEG/Utilities/DescribeClass.h"
#include "ThePEG/Persistency/PersistentOStream.h"
#include "ThePEG/Persistency/PersistentIStream.h"
#include "Herwig++/MatrixElement/Matchbox/Dipoles/SubtractionDipole.h"
#include "Herwig++/MatrixElement/Matchbox/Phasespace/InvertedTildeKinematics.h"
using namespace Herwig;
ShowerApproximation::ShowerApproximation()
: HandlerBase(),
theBelowCutoff(false),
theFFPtCut(1.0*GeV), theFFScreeningScale(ZERO),
theFIPtCut(1.0*GeV), theFIScreeningScale(ZERO),
theIIPtCut(1.0*GeV), theIIScreeningScale(ZERO),
theRestrictPhasespace(true), theHardScaleFactor(1.0),
theRenormalizationScaleFactor(1.0), theFactorizationScaleFactor(1.0),
theExtrapolationX(1.0),
theRealEmissionScaleInSubtraction(showerScale),
theBornScaleInSubtraction(showerScale),
theEmissionScaleInSubtraction(showerScale),
theRealEmissionScaleInSplitting(showerScale),
theBornScaleInSplitting(showerScale),
theEmissionScaleInSplitting(showerScale),
theRenormalizationScaleFreeze(1.*GeV),
theFactorizationScaleFreeze(1.*GeV),
theProfileScales(true),
theProfileRho(0.3), maxPtIsMuF(false) {}
ShowerApproximation::~ShowerApproximation() {}
void ShowerApproximation::setLargeNBasis() {
+ assert(dipole()->realEmissionME()->matchboxAmplitude());
+ if ( !dipole()->realEmissionME()->matchboxAmplitude()->treeAmplitudes() )
+ return;
if ( !theLargeNBasis ) {
- if ( !dipole()->realEmissionME()->matchboxAmplitude() )
- throw Exception() << "expecting an amplitude object"
- << Exception::abortnow;
if ( !dipole()->realEmissionME()->matchboxAmplitude()->colourBasis() )
throw Exception() << "expecting a colour basis object"
<< Exception::abortnow;
theLargeNBasis =
dipole()->realEmissionME()->matchboxAmplitude()->colourBasis()->cloneMe();
theLargeNBasis->clear();
theLargeNBasis->doLargeN();
}
}
void ShowerApproximation::setDipole(Ptr<SubtractionDipole>::tcptr dip) {
theDipole = dip;
setLargeNBasis();
}
Ptr<SubtractionDipole>::tcptr ShowerApproximation::dipole() const { return theDipole; }
bool ShowerApproximation::isAboveCutoff() const {
if ( dipole()->bornEmitter() > 1 &&
dipole()->bornSpectator() > 1 ) {
return dipole()->lastPt() >= ffPtCut();
} else if ( ( dipole()->bornEmitter() > 1 &&
dipole()->bornSpectator() < 2 ) ||
( dipole()->bornEmitter() < 2 &&
dipole()->bornSpectator() > 1 ) ) {
return dipole()->lastPt() >= fiPtCut();
} else {
assert(dipole()->bornEmitter() < 2 &&
dipole()->bornSpectator() < 2);
return dipole()->lastPt() >= iiPtCut();
}
return true;
}
Energy ShowerApproximation::hardScale() const {
if ( !maxPtIsMuF ) {
if ( !bornCXComb()->mePartonData()[0]->coloured() &&
!bornCXComb()->mePartonData()[1]->coloured() ) {
Energy maxPt = (bornCXComb()->meMomenta()[0] + bornCXComb()->meMomenta()[1]).m();
maxPt *= hardScaleFactor();
return maxPt;
}
Energy maxPt = generator()->maximumCMEnergy();
vector<Lorentz5Momentum>::const_iterator p =
bornCXComb()->meMomenta().begin() + 2;
cPDVector::const_iterator pp =
bornCXComb()->mePartonData().begin() + 2;
for ( ; p != bornCXComb()->meMomenta().end(); ++p, ++pp )
if ( (**pp).coloured() )
maxPt = min(maxPt,p->mt());
if ( maxPt == generator()->maximumCMEnergy() )
maxPt = (bornCXComb()->meMomenta()[0] + bornCXComb()->meMomenta()[1]).m();
maxPt *= hardScaleFactor();
return maxPt;
} else {
return hardScaleFactor()*sqrt(bornCXComb()->lastCentralScale());
}
}
double ShowerApproximation::hardScaleProfile(Energy hard, Energy soft) const {
double x = soft/hard;
if ( theProfileScales ) {
if ( x > 1. ) {
return 0.;
} else if ( x <= 1. && x > 1. - theProfileRho ) {
return sqr(1.-x)/(2.*sqr(theProfileRho));
} else if ( x <= 1. - theProfileRho &&
x > 1. - 2.*theProfileRho ) {
return 1. - sqr(1.-2.*theProfileRho-x)/(2.*sqr(theProfileRho));
} else {
return 1.;
}
}
if ( x <= 1. )
return 1.;
return 0.;
}
bool ShowerApproximation::isInShowerPhasespace() const {
if ( !isAboveCutoff() )
return false;
if ( !restrictPhasespace() )
return true;
InvertedTildeKinematics& kinematics =
const_cast<InvertedTildeKinematics&>(*dipole()->invertedTildeKinematics());
tcStdXCombPtr tmpreal = kinematics.realXComb();
tcStdXCombPtr tmpborn = kinematics.bornXComb();
Ptr<SubtractionDipole>::tptr tmpdip = kinematics.dipole();
Energy hard = hardScale();
Energy pt = dipole()->lastPt();
double z = dipole()->lastZ();
pair<double,double> zbounds(0.,1.);
kinematics.dipole(const_ptr_cast<Ptr<SubtractionDipole>::tptr>(theDipole));
kinematics.prepare(realCXComb(),bornCXComb());
if ( pt > hard ) {
kinematics.dipole(tmpdip);
kinematics.prepare(tmpreal,tmpborn);
return false;
}
try {
zbounds = kinematics.zBounds(pt,hard);
} catch(...) {
kinematics.dipole(tmpdip);
kinematics.prepare(tmpreal,tmpborn);
throw;
}
kinematics.dipole(tmpdip);
kinematics.prepare(tmpreal,tmpborn);
return z > zbounds.first && z < zbounds.second;
}
Energy2 ShowerApproximation::showerEmissionScale() const {
Energy2 mur = sqr(dipole()->lastPt());
if ( dipole()->bornEmitter() > 1 &&
dipole()->bornSpectator() > 1 ) {
return mur + sqr(ffScreeningScale());
} else if ( ( dipole()->bornEmitter() > 1 &&
dipole()->bornSpectator() < 2 ) ||
( dipole()->bornEmitter() < 2 &&
dipole()->bornSpectator() > 1 ) ) {
return mur + sqr(fiScreeningScale());
} else {
assert(dipole()->bornEmitter() < 2 &&
dipole()->bornSpectator() < 2);
return mur + sqr(iiScreeningScale());
}
return mur;
}
Energy2 ShowerApproximation::bornRenormalizationScale() const {
return
sqr(dipole()->underlyingBornME()->renormalizationScaleFactor()) *
dipole()->underlyingBornME()->renormalizationScale();
}
Energy2 ShowerApproximation::bornFactorizationScale() const {
return
sqr(dipole()->underlyingBornME()->factorizationScaleFactor()) *
dipole()->underlyingBornME()->factorizationScale();
}
Energy2 ShowerApproximation::realRenormalizationScale() const {
return
sqr(dipole()->realEmissionME()->renormalizationScaleFactor()) *
dipole()->realEmissionME()->renormalizationScale();
}
Energy2 ShowerApproximation::realFactorizationScale() const {
return
sqr(dipole()->realEmissionME()->factorizationScaleFactor()) *
dipole()->realEmissionME()->factorizationScale();
}
double ShowerApproximation::bornPDFWeight(Energy2 muf) const {
if ( !bornCXComb()->mePartonData()[0]->coloured() &&
!bornCXComb()->mePartonData()[1]->coloured() )
return 1.;
if ( muf < sqr(theFactorizationScaleFreeze) )
muf = sqr(theFactorizationScaleFreeze);
double pdfweight = 1.;
if ( bornCXComb()->mePartonData()[0]->coloured() &&
dipole()->underlyingBornME()->havePDFWeight1() )
pdfweight *= dipole()->underlyingBornME()->pdf1(muf,theExtrapolationX);
if ( bornCXComb()->mePartonData()[1]->coloured() &&
dipole()->underlyingBornME()->havePDFWeight2() )
pdfweight *= dipole()->underlyingBornME()->pdf2(muf,theExtrapolationX);
return pdfweight;
}
double ShowerApproximation::realPDFWeight(Energy2 muf) const {
if ( !realCXComb()->mePartonData()[0]->coloured() &&
!realCXComb()->mePartonData()[1]->coloured() )
return 1.;
if ( muf < sqr(theFactorizationScaleFreeze) )
muf = sqr(theFactorizationScaleFreeze);
double pdfweight = 1.;
if ( realCXComb()->mePartonData()[0]->coloured() &&
dipole()->realEmissionME()->havePDFWeight1() )
pdfweight *= dipole()->realEmissionME()->pdf1(muf,theExtrapolationX);
if ( realCXComb()->mePartonData()[1]->coloured() &&
dipole()->realEmissionME()->havePDFWeight2() )
pdfweight *= dipole()->realEmissionME()->pdf2(muf,theExtrapolationX);
return pdfweight;
}
double ShowerApproximation::scaleWeight(int rScale, int bScale, int eScale) const {
double emissionAlpha = 1.;
Energy2 emissionScale = ZERO;
Energy2 showerscale = ZERO;
if ( eScale == showerScale || bScale == showerScale || eScale == showerScale ) {
showerscale = showerRenormalizationScale();
if ( showerscale < sqr(theRenormalizationScaleFreeze) )
showerscale = sqr(theFactorizationScaleFreeze);
}
if ( eScale == showerScale ) {
emissionAlpha = SM().alphaS(showerscale);
emissionScale = showerFactorizationScale();
} else if ( eScale == realScale ) {
emissionAlpha = dipole()->realEmissionME()->lastXComb().lastAlphaS();
emissionScale = dipole()->realEmissionME()->lastScale();
} else if ( eScale == bornScale ) {
emissionAlpha = dipole()->underlyingBornME()->lastXComb().lastAlphaS();
emissionScale = dipole()->underlyingBornME()->lastScale();
}
double emissionPDF = realPDFWeight(emissionScale);
double couplingFactor = 1.;
if ( bScale != rScale ) {
double bornAlpha = 1.;
if ( bScale == showerScale ) {
bornAlpha = SM().alphaS(showerscale);
} else if ( bScale == realScale ) {
bornAlpha = dipole()->realEmissionME()->lastXComb().lastAlphaS();
} else if ( bScale == bornScale ) {
bornAlpha = dipole()->underlyingBornME()->lastXComb().lastAlphaS();
}
double realAlpha = 1.;
if ( rScale == showerScale ) {
realAlpha = SM().alphaS(showerscale);
} else if ( rScale == realScale ) {
realAlpha = dipole()->realEmissionME()->lastXComb().lastAlphaS();
} else if ( rScale == bornScale ) {
realAlpha = dipole()->underlyingBornME()->lastXComb().lastAlphaS();
}
couplingFactor *=
pow(realAlpha/bornAlpha,(double)(dipole()->underlyingBornME()->orderInAlphaS()));
}
Energy2 hardScale = ZERO;
if ( bScale == showerScale ) {
hardScale = showerFactorizationScale();
} else if ( bScale == realScale ) {
hardScale = dipole()->realEmissionME()->lastScale();
} else if ( bScale == bornScale ) {
hardScale = dipole()->underlyingBornME()->lastScale();
}
double bornPDF = bornPDFWeight(hardScale);
if ( bornPDF < 1e-8 )
bornPDF = 0.0;
if ( emissionPDF < 1e-8 )
emissionPDF = 0.0;
if ( emissionPDF == 0.0 || bornPDF == 0.0 )
return 0.0;
return
emissionAlpha * emissionPDF *
couplingFactor / bornPDF;
}
double ShowerApproximation::channelWeight(int emitter, int emission,
int spectator, int bemitter) const {
double cfac = 1.;
double Nc = generator()->standardModel()->Nc();
if (realCXComb()->mePartonData()[emitter]->iColour() == PDT::Colour8){
if (realCXComb()->mePartonData()[emission]->iColour() == PDT::Colour8)
cfac = Nc;
else if ( realCXComb()->mePartonData()[emission]->iColour() == PDT::Colour3 ||
realCXComb()->mePartonData()[emission]->iColour() == PDT::Colour3bar)
cfac = 0.5;
else assert(false);
}
else if ((realCXComb()->mePartonData()[emitter] ->iColour() == PDT::Colour3 ||
realCXComb()->mePartonData()[emitter] ->iColour() == PDT::Colour3bar))
cfac = (sqr(Nc)-1.)/(2.*Nc);
else assert(false);
// do the most simple thing for the time being; needs fixing later
if ( realCXComb()->mePartonData()[emission]->id() == ParticleID::g ) {
Energy2 pipk =
realCXComb()->meMomenta()[emitter] * realCXComb()->meMomenta()[spectator];
Energy2 pipj =
realCXComb()->meMomenta()[emitter] * realCXComb()->meMomenta()[emission];
Energy2 pjpk =
realCXComb()->meMomenta()[emission] * realCXComb()->meMomenta()[spectator];
return cfac *GeV2 * pipk / ( pipj * ( pipj + pjpk ) );
}
return
cfac * GeV2 / (realCXComb()->meMomenta()[emitter] * realCXComb()->meMomenta()[emission]);
}
double ShowerApproximation::channelWeight() const {
double currentChannel = channelWeight(dipole()->realEmitter(),
dipole()->realEmission(),
dipole()->realSpectator(),
dipole()->bornEmitter());
if ( currentChannel == 0. )
return 0.;
double sum = 0.;
for ( vector<Ptr<SubtractionDipole>::ptr>::const_iterator dip =
dipole()->partnerDipoles().begin();
dip != dipole()->partnerDipoles().end(); ++dip )
sum += channelWeight((**dip).realEmitter(),
(**dip).realEmission(),
(**dip).realSpectator(),
(**dip).bornEmitter());
assert(sum > 0.0);
return currentChannel / sum;
}
// If needed, insert default implementations of virtual function defined
// in the InterfacedBase class here (using ThePEG-interfaced-impl in Emacs).
void ShowerApproximation::persistentOutput(PersistentOStream & os) const {
os << theLargeNBasis
<< theBornXComb << theRealXComb << theTildeXCombs << theDipole << theBelowCutoff
<< ounit(theFFPtCut,GeV) << ounit(theFFScreeningScale,GeV)
<< ounit(theFIPtCut,GeV) << ounit(theFIScreeningScale,GeV)
<< ounit(theIIPtCut,GeV) << ounit(theIIScreeningScale,GeV)
<< theRestrictPhasespace << theHardScaleFactor
<< theRenormalizationScaleFactor << theFactorizationScaleFactor
<< theExtrapolationX
<< theRealEmissionScaleInSubtraction << theBornScaleInSubtraction
<< theEmissionScaleInSubtraction << theRealEmissionScaleInSplitting
<< theBornScaleInSplitting << theEmissionScaleInSplitting
<< ounit(theRenormalizationScaleFreeze,GeV)
<< ounit(theFactorizationScaleFreeze,GeV)
<< theProfileScales << theProfileRho << maxPtIsMuF;
}
void ShowerApproximation::persistentInput(PersistentIStream & is, int) {
is >> theLargeNBasis
>> theBornXComb >> theRealXComb >> theTildeXCombs >> theDipole >> theBelowCutoff
>> iunit(theFFPtCut,GeV) >> iunit(theFFScreeningScale,GeV)
>> iunit(theFIPtCut,GeV) >> iunit(theFIScreeningScale,GeV)
>> iunit(theIIPtCut,GeV) >> iunit(theIIScreeningScale,GeV)
>> theRestrictPhasespace >> theHardScaleFactor
>> theRenormalizationScaleFactor >> theFactorizationScaleFactor
>> theExtrapolationX
>> theRealEmissionScaleInSubtraction >> theBornScaleInSubtraction
>> theEmissionScaleInSubtraction >> theRealEmissionScaleInSplitting
>> theBornScaleInSplitting >> theEmissionScaleInSplitting
>> iunit(theRenormalizationScaleFreeze,GeV)
>> iunit(theFactorizationScaleFreeze,GeV)
>> theProfileScales >> theProfileRho >> maxPtIsMuF;
}
// *** Attention *** The following static variable is needed for the type
// description system in ThePEG. Please check that the template arguments
// are correct (the class and its base class), and that the constructor
// arguments are correct (the class name and the name of the dynamically
// loadable library where the class implementation can be found).
DescribeAbstractClass<ShowerApproximation,HandlerBase>
describeHerwigShowerApproximation("Herwig::ShowerApproximation", "Herwig.so");
void ShowerApproximation::Init() {
static ClassDocumentation<ShowerApproximation> documentation
("ShowerApproximation describes the shower emission to be used "
"in NLO matching.");
static Parameter<ShowerApproximation,Energy> interfaceFFPtCut
("FFPtCut",
"Set the pt infrared cutoff",
&ShowerApproximation::theFFPtCut, GeV, 1.0*GeV, 0.0*GeV, 0*GeV,
false, false, Interface::lowerlim);
static Parameter<ShowerApproximation,Energy> interfaceFIPtCut
("FIPtCut",
"Set the pt infrared cutoff",
&ShowerApproximation::theFIPtCut, GeV, 1.0*GeV, 0.0*GeV, 0*GeV,
false, false, Interface::lowerlim);
static Parameter<ShowerApproximation,Energy> interfaceIIPtCut
("IIPtCut",
"Set the pt infrared cutoff",
&ShowerApproximation::theIIPtCut, GeV, 1.0*GeV, 0.0*GeV, 0*GeV,
false, false, Interface::lowerlim);
static Parameter<ShowerApproximation,Energy> interfaceFFScreeningScale
("FFScreeningScale",
"Set the screening scale",
&ShowerApproximation::theFFScreeningScale, GeV, 0.0*GeV, 0.0*GeV, 0*GeV,
false, false, Interface::lowerlim);
static Parameter<ShowerApproximation,Energy> interfaceFIScreeningScale
("FIScreeningScale",
"Set the screening scale",
&ShowerApproximation::theFIScreeningScale, GeV, 0.0*GeV, 0.0*GeV, 0*GeV,
false, false, Interface::lowerlim);
static Parameter<ShowerApproximation,Energy> interfaceIIScreeningScale
("IIScreeningScale",
"Set the screening scale",
&ShowerApproximation::theIIScreeningScale, GeV, 0.0*GeV, 0.0*GeV, 0*GeV,
false, false, Interface::lowerlim);
static Switch<ShowerApproximation,bool> interfaceRestrictPhasespace
("RestrictPhasespace",
"Switch on or off phasespace restrictions",
&ShowerApproximation::theRestrictPhasespace, true, false, false);
static SwitchOption interfaceRestrictPhasespaceOn
(interfaceRestrictPhasespace,
"On",
"Perform phasespace restrictions",
true);
static SwitchOption interfaceRestrictPhasespaceOff
(interfaceRestrictPhasespace,
"Off",
"Do not perform phasespace restrictions",
false);
static Parameter<ShowerApproximation,double> interfaceHardScaleFactor
("HardScaleFactor",
"The hard scale factor.",
&ShowerApproximation::theHardScaleFactor, 1.0, 0.0, 0,
false, false, Interface::lowerlim);
static Parameter<ShowerApproximation,double> interfaceRenormalizationScaleFactor
("RenormalizationScaleFactor",
"The hard scale factor.",
&ShowerApproximation::theRenormalizationScaleFactor, 1.0, 0.0, 0,
false, false, Interface::lowerlim);
static Parameter<ShowerApproximation,double> interfaceFactorizationScaleFactor
("FactorizationScaleFactor",
"The hard scale factor.",
&ShowerApproximation::theFactorizationScaleFactor, 1.0, 0.0, 0,
false, false, Interface::lowerlim);
static Parameter<ShowerApproximation,double> interfaceExtrapolationX
("ExtrapolationX",
"The x from which on extrapolation should be performed.",
&ShowerApproximation::theExtrapolationX, 1.0, 0.0, 1.0,
false, false, Interface::limited);
static Switch<ShowerApproximation,int> interfaceRealEmissionScaleInSubtraction
("RealEmissionScaleInSubtraction",
"Set the scale choice for the real emission cross section in the matching subtraction.",
&ShowerApproximation::theRealEmissionScaleInSubtraction, showerScale, false, false);
static SwitchOption interfaceRealEmissionScaleInSubtractionRealScale
(interfaceRealEmissionScaleInSubtraction,
"RealScale",
"Use the real emission scale.",
realScale);
static SwitchOption interfaceRealEmissionScaleInSubtractionBornScale
(interfaceRealEmissionScaleInSubtraction,
"BornScale",
"Use the Born scale.",
bornScale);
static SwitchOption interfaceRealEmissionScaleInSubtractionShowerScale
(interfaceRealEmissionScaleInSubtraction,
"ShowerScale",
"Use the shower scale",
showerScale);
static Switch<ShowerApproximation,int> interfaceBornScaleInSubtraction
("BornScaleInSubtraction",
"Set the scale choice for the Born cross section in the matching subtraction.",
&ShowerApproximation::theBornScaleInSubtraction, showerScale, false, false);
static SwitchOption interfaceBornScaleInSubtractionRealScale
(interfaceBornScaleInSubtraction,
"RealScale",
"Use the real emission scale.",
realScale);
static SwitchOption interfaceBornScaleInSubtractionBornScale
(interfaceBornScaleInSubtraction,
"BornScale",
"Use the Born scale.",
bornScale);
static SwitchOption interfaceBornScaleInSubtractionShowerScale
(interfaceBornScaleInSubtraction,
"ShowerScale",
"Use the shower scale",
showerScale);
static Switch<ShowerApproximation,int> interfaceEmissionScaleInSubtraction
("EmissionScaleInSubtraction",
"Set the scale choice for the emission in the matching subtraction.",
&ShowerApproximation::theEmissionScaleInSubtraction, showerScale, false, false);
static SwitchOption interfaceEmissionScaleInSubtractionRealScale
(interfaceEmissionScaleInSubtraction,
"RealScale",
"Use the real emission scale.",
realScale);
static SwitchOption interfaceEmissionScaleInSubtractionEmissionScale
(interfaceEmissionScaleInSubtraction,
"BornScale",
"Use the Born scale.",
bornScale);
static SwitchOption interfaceEmissionScaleInSubtractionShowerScale
(interfaceEmissionScaleInSubtraction,
"ShowerScale",
"Use the shower scale",
showerScale);
static Switch<ShowerApproximation,int> interfaceRealEmissionScaleInSplitting
("RealEmissionScaleInSplitting",
"Set the scale choice for the real emission cross section in the splitting.",
&ShowerApproximation::theRealEmissionScaleInSplitting, showerScale, false, false);
static SwitchOption interfaceRealEmissionScaleInSplittingRealScale
(interfaceRealEmissionScaleInSplitting,
"RealScale",
"Use the real emission scale.",
realScale);
static SwitchOption interfaceRealEmissionScaleInSplittingBornScale
(interfaceRealEmissionScaleInSplitting,
"BornScale",
"Use the Born scale.",
bornScale);
static SwitchOption interfaceRealEmissionScaleInSplittingShowerScale
(interfaceRealEmissionScaleInSplitting,
"ShowerScale",
"Use the shower scale",
showerScale);
static Switch<ShowerApproximation,int> interfaceBornScaleInSplitting
("BornScaleInSplitting",
"Set the scale choice for the Born cross section in the splitting.",
&ShowerApproximation::theBornScaleInSplitting, showerScale, false, false);
static SwitchOption interfaceBornScaleInSplittingRealScale
(interfaceBornScaleInSplitting,
"RealScale",
"Use the real emission scale.",
realScale);
static SwitchOption interfaceBornScaleInSplittingBornScale
(interfaceBornScaleInSplitting,
"BornScale",
"Use the Born scale.",
bornScale);
static SwitchOption interfaceBornScaleInSplittingShowerScale
(interfaceBornScaleInSplitting,
"ShowerScale",
"Use the shower scale",
showerScale);
static Switch<ShowerApproximation,int> interfaceEmissionScaleInSplitting
("EmissionScaleInSplitting",
"Set the scale choice for the emission in the splitting.",
&ShowerApproximation::theEmissionScaleInSplitting, showerScale, false, false);
static SwitchOption interfaceEmissionScaleInSplittingRealScale
(interfaceEmissionScaleInSplitting,
"RealScale",
"Use the real emission scale.",
realScale);
static SwitchOption interfaceEmissionScaleInSplittingEmissionScale
(interfaceEmissionScaleInSplitting,
"BornScale",
"Use the Born scale.",
bornScale);
static SwitchOption interfaceEmissionScaleInSplittingShowerScale
(interfaceEmissionScaleInSplitting,
"ShowerScale",
"Use the shower scale",
showerScale);
static Parameter<ShowerApproximation,Energy> interfaceRenormalizationScaleFreeze
("RenormalizationScaleFreeze",
"The freezing scale for the renormalization scale.",
&ShowerApproximation::theRenormalizationScaleFreeze, GeV, 1.0*GeV, 0.0*GeV, 0*GeV,
false, false, Interface::lowerlim);
static Parameter<ShowerApproximation,Energy> interfaceFactorizationScaleFreeze
("FactorizationScaleFreeze",
"The freezing scale for the factorization scale.",
&ShowerApproximation::theFactorizationScaleFreeze, GeV, 1.0*GeV, 0.0*GeV, 0*GeV,
false, false, Interface::lowerlim);
static Switch<ShowerApproximation,bool> interfaceProfileScales
("ProfileScales",
"Switch on or off use of profile scales.",
&ShowerApproximation::theProfileScales, true, false, false);
static SwitchOption interfaceProfileScalesYes
(interfaceProfileScales,
"Yes",
"Use profile scales.",
true);
static SwitchOption interfaceProfileScalesNo
(interfaceProfileScales,
"No",
"Use a hard cutoff.",
false);
static Parameter<ShowerApproximation,double> interfaceProfileRho
("ProfileRho",
"The rho parameter of the profile scales.",
&ShowerApproximation::theProfileRho, 0.3, 0.0, 1.0,
false, false, Interface::limited);
static Reference<ShowerApproximation,ColourBasis> interfaceLargeNBasis
("LargeNBasis",
"Set the large-N colour basis implementation.",
&ShowerApproximation::theLargeNBasis, false, false, true, true, false);
static Switch<ShowerApproximation,bool> interfaceMaxPtIsMuF
("MaxPtIsMuF",
"",
&ShowerApproximation::maxPtIsMuF, false, false, false);
static SwitchOption interfaceMaxPtIsMuFYes
(interfaceMaxPtIsMuF,
"Yes",
"",
true);
static SwitchOption interfaceMaxPtIsMuFNo
(interfaceMaxPtIsMuF,
"No",
"",
false);
}

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