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diff --git a/MatrixElement/Matchbox/Dipoles/FFMggxDipole.cc b/MatrixElement/Matchbox/Dipoles/FFMggxDipole.cc
--- a/MatrixElement/Matchbox/Dipoles/FFMggxDipole.cc
+++ b/MatrixElement/Matchbox/Dipoles/FFMggxDipole.cc
@@ -1,125 +1,118 @@
// -*- C++ -*-
//
// FFMggxDipole.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 FFMggxDipole class.
//
#include "FFMggxDipole.h"
#include "ThePEG/Interface/ClassDocumentation.h"
#include "ThePEG/Utilities/DescribeClass.h"
#include "ThePEG/MatrixElement/Tree2toNDiagram.h"
#include "ThePEG/StandardModel/StandardModelBase.h"
#include "ThePEG/Persistency/PersistentOStream.h"
#include "ThePEG/Persistency/PersistentIStream.h"
#include "Herwig++/MatrixElement/Matchbox/Base/DipoleRepository.h"
#include "Herwig++/MatrixElement/Matchbox/Utility/SpinCorrelationTensor.h"
#include "Herwig++/MatrixElement/Matchbox/Phasespace/FFMassiveTildeKinematics.h"
#include "Herwig++/MatrixElement/Matchbox/Phasespace/FFMassiveInvertedTildeKinematics.h"
-// TODO: remove
-// only for checking for NaN or inf
-#include <gsl/gsl_math.h>
-
using namespace Herwig;
FFMggxDipole::FFMggxDipole()
: SubtractionDipole() {}
FFMggxDipole::~FFMggxDipole() {}
IBPtr FFMggxDipole::clone() const {
return new_ptr(*this);
}
IBPtr FFMggxDipole::fullclone() const {
return new_ptr(*this);
}
bool FFMggxDipole::canHandle(const cPDVector& partons,
int emitter, int emission, int spectator) const {
return
emitter > 1 && spectator > 1 &&
partons[emission]->id() == ParticleID::g &&
partons[emitter]->id() == ParticleID::g &&
partons[spectator]->mass() != ZERO;
}
double FFMggxDipole::me2() const {
if ( jacobian() == 0.0 )
return 0.0;
double y = subtractionParameters()[0];
double z = subtractionParameters()[1];
// masses, g->gg all masses zero except spectator
double muj2 = sqr( realEmissionME()->lastXComb().mePartonData()[realSpectator()]->mass() / lastDipoleScale() );
// massive extra terms
double vijk = sqrt( sqr(2.*muj2+(1.-muj2)*(1.-y))-4.*muj2 ) / ((1.-muj2)*(1.-y));
Energy2 prop =
2.*((realEmissionME()->lastXComb().meMomenta()[realEmitter()])*
(realEmissionME()->lastXComb().meMomenta()[realEmission()]));
double diag = 1./(1-z*(1-y))+1./(1-(1.-z)*(1.-y))-2./vijk; // kappa=0
double zim = z-0.5*(1.-vijk), zjm = (1.-z)-0.5*(1.-vijk);
Lorentz5Momentum pc =
zim*realEmissionME()->lastXComb().meMomenta()[realEmitter()] -
zjm*realEmissionME()->lastXComb().meMomenta()[realEmission()];
SpinCorrelationTensor corr(-diag,pc,prop/2.*vijk);
double res = -underlyingBornME()->spinColourCorrelatedME2(make_pair(bornEmitter(),bornSpectator()),
corr);
// extra mass terms all = 0.
res *= 16.*Constants::pi*SM().Nc()*(realEmissionME()->lastXComb().lastSHat())*
(realEmissionME()->lastXComb().lastAlphaS())/prop;
res *=
realEmissionME()->finalStateSymmetry() /
underlyingBornME()->finalStateSymmetry();
lastME2(res);
logME2();
- if( gsl_isnan(res) ) cout << "FFMggxDipole::me2() nan" << endl;
- if( gsl_isinf(res)!=0 ) cout << "FFMggxDipole::me2() inf" << endl;
-
- return res > 0. ? res : 0.;
+ return res;
}
void FFMggxDipole::persistentOutput(PersistentOStream &) const {
}
void FFMggxDipole::persistentInput(PersistentIStream &, int) {
}
void FFMggxDipole::Init() {
static ClassDocumentation<FFMggxDipole> documentation
("FFMggxDipole");
DipoleRepository::registerDipole<FFMggxDipole,FFMassiveTildeKinematics,FFMassiveInvertedTildeKinematics>
("FFMggxDipole","FFMassiveTildeKinematics","FFMassiveInvertedTildeKinematics");
}
// *** 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).
DescribeClass<FFMggxDipole,SubtractionDipole>
describeHerwigFFMggxDipole("Herwig::FFMggxDipole", "HwMatchbox.so");
diff --git a/MatrixElement/Matchbox/Dipoles/FFMqgxDipole.cc b/MatrixElement/Matchbox/Dipoles/FFMqgxDipole.cc
--- a/MatrixElement/Matchbox/Dipoles/FFMqgxDipole.cc
+++ b/MatrixElement/Matchbox/Dipoles/FFMqgxDipole.cc
@@ -1,122 +1,115 @@
// -*- C++ -*-
//
// FFMqgxDipole.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 FFMqgxDipole class.
//
#include "FFMqgxDipole.h"
#include "ThePEG/Interface/ClassDocumentation.h"
#include "ThePEG/Utilities/DescribeClass.h"
#include "ThePEG/MatrixElement/Tree2toNDiagram.h"
#include "ThePEG/StandardModel/StandardModelBase.h"
#include "ThePEG/Persistency/PersistentOStream.h"
#include "ThePEG/Persistency/PersistentIStream.h"
#include "Herwig++/MatrixElement/Matchbox/Base/DipoleRepository.h"
#include "Herwig++/MatrixElement/Matchbox/Phasespace/FFMassiveTildeKinematics.h"
#include "Herwig++/MatrixElement/Matchbox/Phasespace/FFMassiveInvertedTildeKinematics.h"
-// TODO: remove
-// only for checking for NaN or inf
-#include <gsl/gsl_math.h>
-
using namespace Herwig;
FFMqgxDipole::FFMqgxDipole()
: SubtractionDipole() {}
FFMqgxDipole::~FFMqgxDipole() {}
IBPtr FFMqgxDipole::clone() const {
return new_ptr(*this);
}
IBPtr FFMqgxDipole::fullclone() const {
return new_ptr(*this);
}
bool FFMqgxDipole::canHandle(const cPDVector& partons,
int emitter, int emission, int spectator) const {
return
emitter > 1 && spectator > 1 &&
partons[emission]->id() == ParticleID::g &&
abs(partons[emitter]->id()) < 7 &&
partons[emitter]->mass() != ZERO;
}
double FFMqgxDipole::me2() const {
if ( jacobian() == 0.0 )
return 0.0;
double y = subtractionParameters()[0];
double z = subtractionParameters()[1];
// masses
double muQ2 = sqr( realEmissionME()->lastXComb().mePartonData()[realEmitter()]->mass() / lastDipoleScale() );
double muj2 = sqr( realEmissionME()->lastXComb().mePartonData()[realSpectator()]->mass() / lastDipoleScale() );
// massive extra terms
double vijk = sqrt( sqr(2.*muj2+(1.-muQ2-muj2)*(1.-y))-4.*muj2 ) / ((1.-muQ2-muj2)*(1.-y));
double vbar = sqrt( 1.+sqr(muQ2)+sqr(muj2)-2.*(muQ2+muj2+muQ2*muj2) ) / (1.-muQ2-muj2);
Energy2 prop =
2.*((realEmissionME()->lastXComb().meMomenta()[realEmitter()])*
(realEmissionME()->lastXComb().meMomenta()[realEmission()]));
double CF = (SM().Nc()*SM().Nc()-1.)/(2.*SM().Nc());
// extra mass terms cancel: mi2+m2-Mi2 = mQ2+0-mQ2
double res =
8.*Constants::pi*CF*(realEmissionME()->lastXComb().lastSHat())*
(realEmissionME()->lastXComb().lastAlphaS())/prop;
res *= ( 2./(1.-z*(1.-y)) - vbar/vijk * ( (1.+z) + muQ2*sqr(lastDipoleScale())*2./prop ) );
res *= -underlyingBornME()->colourCorrelatedME2(make_pair(bornEmitter(),bornSpectator()));
res *=
realEmissionME()->finalStateSymmetry() /
underlyingBornME()->finalStateSymmetry();
lastME2(res);
logME2();
- if( gsl_isnan(res) ) cout << "FFMqgxDipole::me2() nan" << endl;
- if( gsl_isinf(res)!=0 ) cout << "FFMqgxDipole::me2() inf" << endl;
-
- return res > 0. ? res : 0.;
+ return res;
}
void FFMqgxDipole::persistentOutput(PersistentOStream &) const {
}
void FFMqgxDipole::persistentInput(PersistentIStream &, int) {
}
void FFMqgxDipole::Init() {
static ClassDocumentation<FFMqgxDipole> documentation
("FFMqgxDipole");
DipoleRepository::registerDipole<FFMqgxDipole,FFMassiveTildeKinematics,FFMassiveInvertedTildeKinematics>
("FFMqgxDipole","FFMassiveTildeKinematics","FFMassiveInvertedTildeKinematics");
}
// *** 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).
DescribeClass<FFMqgxDipole,SubtractionDipole>
describeHerwigFFMqgxDipole("Herwig::FFMqgxDipole", "HwMatchbox.so");
diff --git a/MatrixElement/Matchbox/Dipoles/FFMqqxDipole.cc b/MatrixElement/Matchbox/Dipoles/FFMqqxDipole.cc
--- a/MatrixElement/Matchbox/Dipoles/FFMqqxDipole.cc
+++ b/MatrixElement/Matchbox/Dipoles/FFMqqxDipole.cc
@@ -1,128 +1,121 @@
// -*- C++ -*-
//
// FFMqqxDipole.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 FFMqqxDipole class.
//
#include "FFMqqxDipole.h"
#include "ThePEG/Interface/ClassDocumentation.h"
#include "ThePEG/Utilities/DescribeClass.h"
#include "ThePEG/MatrixElement/Tree2toNDiagram.h"
#include "ThePEG/StandardModel/StandardModelBase.h"
#include "ThePEG/Persistency/PersistentOStream.h"
#include "ThePEG/Persistency/PersistentIStream.h"
#include "Herwig++/MatrixElement/Matchbox/Base/DipoleRepository.h"
#include "Herwig++/MatrixElement/Matchbox/Utility/SpinCorrelationTensor.h"
#include "Herwig++/MatrixElement/Matchbox/Phasespace/FFMassiveTildeKinematics.h"
#include "Herwig++/MatrixElement/Matchbox/Phasespace/FFMassiveInvertedTildeKinematics.h"
-// TODO: remove
-// only for checking for NaN or inf
-#include <gsl/gsl_math.h>
-
using namespace Herwig;
FFMqqxDipole::FFMqqxDipole()
: SubtractionDipole() {}
FFMqqxDipole::~FFMqqxDipole() {}
IBPtr FFMqqxDipole::clone() const {
return new_ptr(*this);
}
IBPtr FFMqqxDipole::fullclone() const {
return new_ptr(*this);
}
bool FFMqqxDipole::canHandle(const cPDVector& partons,
int emitter, int emission, int spectator) const {
return
emitter > 1 && spectator > 1 &&
abs(partons[emission]->id()) < 6 &&
abs(partons[emitter]->id()) < 6 &&
partons[emission]->id() + partons[emitter]->id() == 0 &&
partons[emission]->mass() != ZERO &&
partons[emitter]->mass() != ZERO;
}
double FFMqqxDipole::me2() const {
if ( jacobian() == 0.0 )
return 0.0;
double y = subtractionParameters()[0];
double z = subtractionParameters()[1];
// masses
double muQ2 = sqr( realEmissionME()->lastXComb().mePartonData()[realEmission()]->mass() / lastDipoleScale() );
double muj2 = sqr( realEmissionME()->lastXComb().mePartonData()[realSpectator()]->mass() / lastDipoleScale() );
Energy2 mQ2 = sqr( realEmissionME()->lastXComb().mePartonData()[realEmission()]->mass() );
// massive extra terms
double vijk = sqrt( sqr(2.*muj2+(1.-2.*muQ2-muj2)*(1.-y))-4.*muj2 ) / ((1.-2.*muQ2-muj2)*(1.-y));
Energy2 prop =
2.*((realEmissionME()->lastXComb().meMomenta()[realEmitter()])*
(realEmissionME()->lastXComb().meMomenta()[realEmission()]));
double zim = z-0.5*(1.-vijk), zjm = (1.-z)-0.5*(1.-vijk);
Lorentz5Momentum pc =
zim*realEmissionME()->lastXComb().meMomenta()[realEmitter()] -
zjm*realEmissionME()->lastXComb().meMomenta()[realEmission()];
// kappa=0 -- otherwise: extra diagonal term (instead of just -1.)
SpinCorrelationTensor corr(-1.,pc,-(prop+2.*mQ2)/4.);
double res = -underlyingBornME()->spinColourCorrelatedME2(make_pair(bornEmitter(),bornSpectator()),
corr);
res *= 4.*Constants::pi*(realEmissionME()->lastXComb().lastSHat())*
(realEmissionME()->lastXComb().lastAlphaS())/ (prop+2.*mQ2);
res *=
realEmissionME()->finalStateSymmetry() /
underlyingBornME()->finalStateSymmetry();
lastME2(res);
logME2();
- if( gsl_isnan(res) ) cout << "FFMqqxDipole::me2() nan" << endl;
- if( gsl_isinf(res)!=0 ) cout << "FFMqqxDipole::me2() inf" << endl;
-
- return res > 0. ? res : 0.;
+ return res;
}
void FFMqqxDipole::persistentOutput(PersistentOStream &) const {
}
void FFMqqxDipole::persistentInput(PersistentIStream &, int) {
}
void FFMqqxDipole::Init() {
static ClassDocumentation<FFMqqxDipole> documentation
("FFMqqxDipole");
DipoleRepository::registerDipole<FFMqqxDipole,FFMassiveTildeKinematics,FFMassiveInvertedTildeKinematics>
("FFMqqxDipole","FFMassiveTildeKinematics","FFMassiveInvertedTildeKinematics");
}
// *** 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).
DescribeClass<FFMqqxDipole,SubtractionDipole>
describeHerwigFFMqqxDipole("Herwig::FFMqqxDipole", "HwMatchbox.so");
diff --git a/MatrixElement/Matchbox/InsertionOperators/DipoleMIOperator.cc b/MatrixElement/Matchbox/InsertionOperators/DipoleMIOperator.cc
--- a/MatrixElement/Matchbox/InsertionOperators/DipoleMIOperator.cc
+++ b/MatrixElement/Matchbox/InsertionOperators/DipoleMIOperator.cc
@@ -1,380 +1,347 @@
// -*- C++ -*-
//
// DipoleMIOperator.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 DipoleMIOperator class.
//
#include "DipoleMIOperator.h"
#include "ThePEG/Interface/ClassDocumentation.h"
#include "ThePEG/Interface/Switch.h"
#include "ThePEG/StandardModel/StandardModelBase.h"
#include "ThePEG/Repository/EventGenerator.h"
#include "ThePEG/Utilities/Throw.h"
#include "ThePEG/Utilities/DescribeClass.h"
#include "ThePEG/Persistency/PersistentOStream.h"
#include "ThePEG/Persistency/PersistentIStream.h"
#include "Herwig++/MatrixElement/Matchbox/Base/DipoleRepository.h"
#include <gsl/gsl_sf_dilog.h>
// TODO: remove
// only for checking for NaN or inf
#include <gsl/gsl_math.h>
using namespace Herwig;
using Constants::pi;
DipoleMIOperator::DipoleMIOperator()
: MatchboxInsertionOperator(),
CA(-1.0), CF(-1.0),
gammaQuark(-1.0), gammaGluon(-1.0),
KQuark(-1.0), KGluon(-1.0),
theUseDR(false) {}
DipoleMIOperator::~DipoleMIOperator() {}
IBPtr DipoleMIOperator::clone() const {
return new_ptr(*this);
}
IBPtr DipoleMIOperator::fullclone() const {
return new_ptr(*this);
}
void DipoleMIOperator::dumpInfo(const string& prefix) const {
generator()->log() << prefix << fullName()
<< " [" << this << "]\n";
generator()->log() << prefix << " | XComb " << lastXCombPtr()
<< " for ";
if ( lastXCombPtr() ) {
for ( cPDVector::const_iterator p = lastXComb().mePartonData().begin();
p != lastXComb().mePartonData().end(); ++p ) {
generator()->log() << (**p).PDGName() << " ";
}
}
generator()->log() << " | Born ME\n";
lastBorn()->dumpInfo(prefix+" | ");
}
void DipoleMIOperator::setBorn(Ptr<MatchboxMEBase>::tptr me) {
MatchboxInsertionOperator::setBorn(me);
CA = SM().Nc();
CF = (SM().Nc()*SM().Nc()-1.0)/(2.*SM().Nc());
gammaQuark = (3./2.)*CF;
gammaGluon = (11./6.)*CA - (1./3.)*lastBorn()->nLight();
KQuark = (7./2.-sqr(pi)/6.)*CF;
KGluon = (67./18.-sqr(pi)/6.)*CA-(5./9.)*lastBorn()->nLight();
if ( isDR() ) {
gammaQuark -= CF/2.;
gammaGluon -= CA/6.;
}
}
bool DipoleMIOperator::apply(const cPDVector& pd) const {
bool oneMassive = false;
bool first = false;
bool second = false;
int i=0;
for ( cPDVector::const_iterator p = pd.begin();
p != pd.end(); ++p, ++i ) {
if ( abs((**p).id()) < 7&& (**p).mass() != ZERO )
oneMassive = true;
if ( !first ) {
if ( apply(*p, i<2 ? true : false) )
first = true;
} else {
if ( apply(*p, i<2 ? true : false) )
second = true;
}
}
return first && second && oneMassive;
}
bool DipoleMIOperator::apply(tcPDPtr pd, bool incoming) const {
return
// pd->mass() == ZERO &&
// (abs(pd->id()) < 6 || pd->id() == ParticleID::g);
( abs(pd->id()) < 6 && !incoming && pd->mass() != ZERO ) ||
( abs(pd->id()) < 6 && incoming && pd->mass() == ZERO ) ||
pd->id() == ParticleID::g;
}
double DipoleMIOperator::me2() const {
double res = 0.;
int idj = 0; int idk = 0;
for ( cPDVector::const_iterator j = mePartonData().begin();
j != mePartonData().end(); ++j, ++idj ) {
if ( !apply(*j) )
continue;
idk = 0;
for ( cPDVector::const_iterator k = mePartonData().begin();
k != mePartonData().end(); ++k, ++idk ) {
if ( !apply(*k) )
continue;
if ( j == k || lastBorn()->noDipole(idj,idk) )
continue;
// new
Energy2 sjk = 2.*meMomenta()[idj]*meMomenta()[idk];
double kappa=0.;
// renormalization scale (should cancel with something)
Energy2 mu2 = lastBorn()->renormalizationScale();
- // ASSUMING INCOMING PARTICLES HAVE ARE AT 0 AND 1 IN mePartonData, OUTGOING >= 2
+ // outgoing partons start at id 2
// this is the I operator in the case of no initial-state hadrons (6.16)
if( idj>=2 && idk>=2 )
res +=
( ((**j).id() == ParticleID::g ? CA : CF) * (Vj(**j,**k,sjk,kappa)-sqr(pi)/3.) +
((**j).id() == ParticleID::g ? GammaGluon() : GammaQuark(**j)) +
((**j).id() == ParticleID::g ? gammaGluon : gammaQuark) * (1.+log(mu2/sjk)) +
((**j).id() == ParticleID::g ? KGluon : KQuark) ) *
lastBorn()->colourCorrelatedME2(make_pair(idj,idk));
// additional terms in the case of one initial-state hadron (6.51)
if( idj>=2 && idk<2 ) {
res +=
( ((**j).id() == ParticleID::g ? CA : CF) * (Vj(**j,**k,sjk,kappa)-sqr(pi)/3.) +
((**j).id() == ParticleID::g ? GammaGluon() : GammaQuark(**j)) +
((**j).id() == ParticleID::g ? gammaGluon : gammaQuark) * (1.+log(mu2/sjk)) +
((**j).id() == ParticleID::g ? KGluon : KQuark) ) *
lastBorn()->colourCorrelatedME2(make_pair(idj,idk));
res +=
( ((**k).id() == ParticleID::g ? CA : CF) * (Vj(**k,**j,sjk,2./3.,true)-sqr(pi)/3.) +
// MAKE SURE lastScale() RETURNS (pi+pj)^2, NOT 2.*pi*pj !!!!
((**k).id() == ParticleID::g ? gammaGluon : gammaQuark) * ( log(lastScale()/mu2) + log(mu2/sjk) + 1. ) +
((**k).id() == ParticleID::g ? KGluon : KQuark) ) *
lastBorn()->colourCorrelatedME2(make_pair(idk,idj));
}
// additional terms in the case of two initial-state hadrons (6.66)
if( idj<2 && idk<2 )
res +=
( ((**j).id() == ParticleID::g ? CA : CF) * ( 0.5*sqr(log(lastScale()/sjk)) - sqr(pi)/3. ) +
((**j).id() == ParticleID::g ? gammaGluon : gammaQuark) * ( log(lastScale()/sjk) + 1. ) +
((**j).id() == ParticleID::g ? KGluon : KQuark) ) *
lastBorn()->colourCorrelatedME2(make_pair(idj,idk));
}
}
res *= ( - lastBorn()->lastAlphaS() / (2.*pi) );
if( gsl_isnan(res) ) cout << "DipoleMIOperator::me2 nan" << endl;
if( gsl_isinf(res) ) cout << "DipoleMIOperator::me2 inf" << endl;
- // MAKE SURE lastScale() RETURNS (pi+pj)^2, NOT 2.*pi*pj !!!!
- // check against e+ e- --> q qbar
-
-// Energy2 mj2 = sqr(mePartonData()[appliedParton]->mass());
-// Energy2 sjk = 2.*meMomenta()[2]*meMomenta()[3];
-// Energy2 Qjk2 = sjk + 2.*mj2;
-//
-// double v = sqrt(1.-4.*mj2/Qjk2);
-// double VS = (1.+v*v)/(2.*v)*log(2./(1.+v*v))*log((1.-v)/(1.+v)) -
-// (1.+v*v)/(4.*v)*sqr(log((1.-v)/(1.+v))) - (1.+v*v)/(2.*v)*sqr(pi)/6. +
-// (1.+v*v)/(2.*v)*log(2./(1.+v*v))*log((1.-v)/(1.+v));
-// double VNS = 3./2.*log((1.+v*v)/2.) +
-// (1.+v*v)/(2.*v) * ( 2.*log((1.-v)/(1.+v))*log(2.*(1.+v*v)/sqr(1.+v)) +
-// 2.*gsl_sf_dilog(sqr((1.-v)/(1.+v))) - 2.*gsl_sf_dilog(2.*v/(1.+v)) - sqr(pi)/6. ) +
-// log(1.-1./2.*sqrt(1.-v*v)) - 2.*log(1.-sqrt(1.-v*v)) -
-// (1.-v*v)/(1.+v*v)*log(sqrt(1.-v*v)/(2.-sqrt(1.-v*v))) -
-// sqrt(1.-v*v)/(2.-sqrt(1.-v*v)) + 2.*(1.-v*v-sqrt(1.-v*v))/(1.+v*v) + sqr(pi)/2.;
-//
-//
-// double target = 2.*lastBorn()->lastAlphaS() / (2.*pi) * CF *
-// ( VS + VNS + 1./2.*log((1.-v*v)/4.) - 2. + 3./2.*log(2./(1+v*v)) -
-// sqr(pi)/3. + (gammaQuark+KQuark)/CF );
-//
-// target *= lastBorn()->me2();
-//
-// cout << "+++++++++++++++++++++++++++++MI diff resc " << (res-target)/(res+target) << endl;
-// cout << "res " << res << " target " << target << " @id " << mePartonData()[appliedParton]->id() << endl;
-// cout << "VS+VNS part " << 2.*lastBorn()->lastAlphaS() / (2.*pi) * CF * ( VS + VNS ) <<
-// " while VS+VNS " << VS+VNS << endl;
-
return res;
}
double DipoleMIOperator::GammaQuark(const ParticleData& j) const {
// renormalization scale (should cancel with something)
Energy2 mu2 = lastBorn()->renormalizationScale();
// massless quark: only finite remainder
- // MAKE SURE lastScale() RETURNS (pi+pj)^2, NOT 2.*pi*pj !!!!
if( j.mass() == ZERO ) return gammaQuark * log(lastScale()/mu2);
// massive quark
return CF * ( log(lastScale()/mu2) + 0.5*log(sqr(j.mass())/mu2) - 2. );
}
double DipoleMIOperator::GammaGluon() const {
// main contribution cancels with VjNS, only finite 1/eps remainder
return gammaGluon * log( lastScale() / lastBorn()->renormalizationScale() );
}
double DipoleMIOperator::Vj(const ParticleData& j, const ParticleData& k,
Energy2 sjk, double kappa, bool mFSetEmpty) const {
double res = 0.;
Energy2 mj2 = sqr(j.mass()), mk2 = sqr(k.mass());
-// Energy2 sjk = 2.*meMomenta()[idj]*meMomenta()[idk];
Energy2 Qjk2 = sjk + mj2 + mk2;
Energy Qjk = sqrt(Qjk2);
Energy mj = j.mass(), mk = k.mass();
double vjk = rootOfKallen(Qjk2,mj2,mk2) / sjk;
double rho = sqrt( abs(1.-vjk)/(1.+vjk) ); // abs() because for small mass 1.-vjk can get O(-1.e-16)
double rhoj = sqrt( ( 1. - vjk + 2.*mj2/Qjk2 / (1.-mj2/Qjk2-mk2/Qjk2) ) /
( 1. + vjk + 2.*mj2/Qjk2 / (1.-mj2/Qjk2-mk2/Qjk2) ) );
double rhok = sqrt( ( 1. - vjk + 2.*mk2/Qjk2 / (1.-mj2/Qjk2-mk2/Qjk2) ) /
( 1. + vjk + 2.*mk2/Qjk2 / (1.-mj2/Qjk2-mk2/Qjk2) ) );
ParticleData l = ( mj2 == ZERO ? k : j );
// S part (6.20)
// both masses zero
if( mj2 == ZERO && mk2 == ZERO )
// only finite 1/eps^2 remainder
res += 1./2.*sqr(log(Qjk2/sjk));
// one mass zero
else if( mj2 == ZERO || mk2 == ZERO ) {
Energy2 m2 = sqr(l.mass());
res += -1./4.*sqr(log(m2/sjk)) - sqr(pi)/12. -
1./2.*log(m2/sjk)*log(sjk/Qjk2) - 1./2.*log(m2/Qjk2)*log(sjk/Qjk2);
// finite 1/eps^2 remainder
res += 1./4.*sqr(log(Qjk2/sjk));
// finite 1/eps remainder
res += 1./2.*log(m2/sjk)*log(Qjk2/sjk);
}
// no mass zero
else if( mj2 != ZERO && mk2 != ZERO ) {
res += 1./vjk * ( -1./4.*sqr(log(rhoj*rhoj)) - 1./4.*sqr(log(rhok*rhok)) -
sqr(pi)/6. + ( rho==0. ? 0. : log(rho)*log(Qjk2/sjk) ) );
// finite 1/eps remainder
res += 1./vjk * ( rho==0. ? 0. : log(rho)*log(Qjk2/sjk) );
}
else cout << "problem occurred in DipoleMIOperator::Vj -- S part" << endl;
// double resS = res;
if(gsl_isnan(res)) cout << "Vj S nan" << " j " << j.id() << " k " << k.id() << endl;
// NS part (6.21)-(6.26)
// V_q (j is quark)
// j is massive quark
if( mj2 != ZERO ) {
assert( abs(j.id()) < 7);
res += gammaQuark/CF * log(sjk/Qjk2); // iff j and/or k is massive quark (6.21),(6.22)
// k is massive quark (6.21)
if( mk2 != ZERO ) {
assert( abs(k.id()) < 7);
res += 1./vjk * ( ( rho==0. ? 0. : log(rho*rho)*log(1.+rho*rho) ) + 2.*gsl_sf_dilog(rho*rho) -
gsl_sf_dilog(1.-rhoj*rhoj) - gsl_sf_dilog(1.-rhok*rhok) - sqr(pi)/6. ) +
log((Qjk-mk)/Qjk) - 2.*log((sqr(Qjk-mk)-mj2)/Qjk2) - 2.*mj2/sjk*log(mj/(Qjk-mk)) -
mk/(Qjk-mk) + 2.*mk*(2.*mk-Qjk)/sjk + sqr(pi)/2.;
}
// k is massless parton (6.22)
else {
res += sqr(pi)/6. - gsl_sf_dilog(sjk/Qjk2) -
2.*log(sjk/Qjk2) - mj2/sjk*log(mj2/Qjk2);
}
}
// V_q / V_g (j is massless parton)
else {
// k is massless parton
if( mk == ZERO ) {
// only contribution if j is gluon
if( j.id() == ParticleID::g ) {
// sum over all quark flavours
if( !mFSetEmpty )
- for( int f=1; f< 7; ++f ) {
+ // TODO: make fmax depend on matrix element
+ for( int f=1; f< 6; ++f ) {
Energy2 mF2 = sqr( getParticleData(f)->mass() );
// only heavy quarks
if( mF2 == ZERO ) continue;
// sum only over quarks which meet special condition
if( sjk <= 4.*sqrt(mF2)*(sqrt(mF2)+mk) )
continue;
double rho1 = sqrt( 1. - 4.*mF2 / sqr(Qjk-mk) );
-// double rho2 = sqrt( 1. - 4.*mF2 / (Qjk2-mk2) );
res += 2./3./CA * ( log((1.+rho1)/2.) - rho1/3.*(3.+sqr(rho1)) - 0.5*log(mF2/Qjk2) );
}
}
}
// k is massive quark
else {
assert( abs(k.id()) < 7);
// part common to j massless quark or gluon
-// if( mk > ZERO )
res += sqr(pi)/6. - gsl_sf_dilog(sjk/Qjk2);
// j is massless (incoming) quark
if( abs(j.id()) < 7)
res += gammaQuark/CF * ( log(sjk/Qjk2) - 2.*log((Qjk-mk)/Qjk) - 2.*mk/(Qjk+mk) );
// j is gluon
else if( j.id() == ParticleID::g ) {
// part independent of other heavy quark flavours
- // if( mk > ZERO )
res += gammaGluon/CA * ( log(sjk/Qjk2) - 2.*log((Qjk-mk)/Qjk) - 2.*mk/(Qjk+mk) ) +
(kappa-2./3.) * mk2/sjk * (1./CA*lastBorn()->nLight()-1.) * log(2.*mk/(Qjk+mk));
// part containing other heavy quark flavours
if( !mFSetEmpty )
- for( int f=1; f< 7; ++f ) {
+ // TODO: make fmax dependent on matrix element
+ for( int f=1; f< 6; ++f ) {
Energy2 mF2 = sqr( getParticleData(f)->mass() );
// only heavy quarks
if( mF2 == ZERO ) continue;
// sum only over quarks which meet special condition
if( sjk <= 4.*sqrt(mF2)*(sqrt(mF2)+mk) )
continue;
double rho1 = sqrt( 1. - 4.*mF2 / sqr(Qjk-mk) );
double rho2 = sqrt( 1. - 4.*mF2 / (Qjk2-mk2) );
res += 2./3./CA * ( log((Qjk-mk)/Qjk) + mk*rho1*rho1*rho1/(Qjk+mk) + log((1.+rho1)/2.) -
rho1/3.*(3.+sqr(rho1)) - 1./2.*log(mF2/Qjk2) ) +
1./CA * ( rho2*rho2*rho2*log((rho2-rho1)/(rho2+rho1)) - log((1.-rho1)/(1.+rho1)) -
8.*rho1*mF2/sjk );
}
}
}
}
return res;
}
void DipoleMIOperator::persistentOutput(PersistentOStream & os) const {
os << CA << CF << gammaQuark << gammaGluon << KQuark << KGluon << theUseDR;
}
void DipoleMIOperator::persistentInput(PersistentIStream & is, int) {
is >> CA >> CF >> gammaQuark >> gammaGluon >> KQuark >> KGluon >> theUseDR;
}
// *** 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).
DescribeClass<DipoleMIOperator,MatchboxInsertionOperator>
describeHerwigDipoleMIOperator("Herwig::DipoleMIOperator", "HwMatchbox.so");
void DipoleMIOperator::Init() {
static ClassDocumentation<DipoleMIOperator> documentation
("DipoleMIOperator");
DipoleRepository::registerInsertionOperator<DipoleMIOperator>("MassiveIOperator");
}

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