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// -*- C++ -*-
//
// PDFBase.cc is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 1999-2011 Leif Lonnblad
//
// ThePEG 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 PDFBase class.
//
#include "PDFBase.h"
#include "ThePEG/PDF/RemnantHandler.h"
#include "ThePEG/Persistency/PersistentOStream.h"
#include "ThePEG/Persistency/PersistentIStream.h"
#include "ThePEG/PDT/ParticleData.h"
#include "ThePEG/Interface/Reference.h"
#include "ThePEG/Interface/Switch.h"
#include "ThePEG/Utilities/Debug.h"
#include "ThePEG/Repository/Repository.h"
#include "ThePEG/Utilities/EnumIO.h"
#include "ThePEG/Interface/ClassDocumentation.h"
#include "ThePEG/PDT/StandardMatchers.h"
using namespace ThePEG;
PDFBase::PDFBase()
: rangeException(rangeZero) {}
PDFBase::PDFBase(const PDFBase & x)
: HandlerBase(x), theRemnantHandler(x.theRemnantHandler),
rangeException(x.rangeException) {}
PDFBase::~PDFBase() {}
bool PDFBase::canHandle(tcPDPtr particle) const {
return canHandleParticle(particle) && remnantHandler() &&
remnantHandler()->canHandle(particle, partons(particle));
}
bool PDFBase::hasPoleIn1(tcPDPtr, tcPDPtr) const {
return false;
}
double PDFBase::
xfx(tcPDPtr particle, tcPDPtr parton, Energy2 partonScale, double x,
double eps, Energy2 particleScale) const {
using Math::log1m;
return xfl(particle, parton, partonScale,
(x < 0.5 || eps <= 0.0)? -log(x): -log1m(eps), particleScale);
}
double PDFBase::
xfl(tcPDPtr particle, tcPDPtr parton, Energy2 partonScale, double l,
Energy2 particleScale) const {
using Math::exp1m;
return xfx(particle, parton, partonScale, exp(-l), exp1m(-l), particleScale);
}
double PDFBase::
xfvx(tcPDPtr particle, tcPDPtr parton, Energy2 partonScale, double x,
double eps, Energy2 particleScale) const {
if ( !QuarkMatcher::Check(*parton) ) return 0.0;
return max(0.0, xfx(particle, parton, partonScale, x, eps, particleScale) -
xfx(particle, parton->CC(), partonScale, x, eps, particleScale));
}
double PDFBase::
xfvl(tcPDPtr particle, tcPDPtr parton, Energy2 partonScale, double l,
Energy2 particleScale) const {
if ( !QuarkMatcher::Check(*parton) ) return 0.0;
return max(0.0, xfl(particle, parton, partonScale, l, particleScale) -
xfl(particle, parton->CC(), partonScale, l, particleScale));
}
double PDFBase::
xfsx(tcPDPtr particle, tcPDPtr parton, Energy2 partonScale, double x,
double eps, Energy2 particleScale) const {
return max(0., xfx(particle,parton,partonScale,x,eps,particleScale)-
xfvx(particle,parton,partonScale,x,eps,particleScale));
}
double PDFBase::
xfsl(tcPDPtr particle, tcPDPtr parton, Energy2 partonScale, double l,
Energy2 particleScale) const {
return max(0., xfl(particle,parton,partonScale,l,particleScale)-
xfvl(particle,parton,partonScale,l,particleScale));
}
double PDFBase::flattenL(tcPDPtr, tcPDPtr, const PDFCuts & c,
double z, double & jacobian) const {
jacobian *= c.lMax() - c.lMin();
return c.lMin() + z*(c.lMax() - c.lMin());
}
double PDFBase::
flattenScale(tcPDPtr, tcPDPtr, const PDFCuts & c,
double l, double z, double & jacobian) const {
if ( c.scaleMin() > ZERO ) {
double r = c.scaleMaxL(l)/c.scaleMin();
double ret = pow(r, z - 1.0);
jacobian *= log(r)*ret;
return ret;
} else {
return z;
}
}
void PDFBase::doinit() {
HandlerBase::doinit();
}
void PDFBase::persistentOutput(PersistentOStream & os) const {
os << theRemnantHandler << oenum(rangeException);
}
void PDFBase::persistentInput(PersistentIStream & is, int) {
is >> theRemnantHandler >> ienum(rangeException);
}
AbstractClassDescription<PDFBase> PDFBase::initPDFBase;
void PDFBase::Init() {
static ClassDocumentation<PDFBase> documentation
("There is no documentation for the ThePEG::PDFBase class");
static Reference<PDFBase,RemnantHandler> interfaceRemnantHandler
("RemnantHandler",
"A remnant handler capable of generating remnants for the partons "
"which can be extracted with this PDF.",
&PDFBase::theRemnantHandler, false, false, true, false);
static Switch<PDFBase,RangeException> interfaceRangeException
("RangeException",
"How to handle cases when momentum fractions or scales are "
"outside of limits. Note that this switch may be ignored in sub-classes.",
&PDFBase::rangeException, rangeZero, true, false);
static SwitchOption interfaceRangeExceptionFreeze
(interfaceRangeException,
"Freeze", "Values are frozen outside the given ranges.", rangeFreeze);
static SwitchOption interfaceRangeExceptionZero
(interfaceRangeException,
"Zero", "Values are zero outside the given ranges.", rangeZero);
static SwitchOption interfaceRangeExceptionThrow
(interfaceRangeException,
"Throw", "An exception is thrown outside the given ranges.", rangeThrow);
}
RemnantHandlerCantHandle::RemnantHandlerCantHandle(string pdf, string rh) {
theMessage << "Cannot assign '" << rh << "' as remnant handler for the "
<< "parton density object '" << pdf
<< "' because the remnant handler does not feel up to the job.";
severity(warning);
}
PDFWrongParticle::PDFWrongParticle(string p, string pdf, string mess) {
theMessage << "Cannot assign particle '" << p << "' to be handled by the "
<< "parton density object '" << pdf << "'. " << mess;
severity(warning);
}
PDFRange::PDFRange(string pdf, string var, double val, double lim) {
theMessage << "In parton density function '" << pdf << "': the value of "
<< var << ", " << val << ", was out of range (" << lim
<< ").";
severity(eventerror);
}
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