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GtoGGSplitFun.cc
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GtoGGSplitFun.cc
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// -*- C++ -*-
//
// This is the implementation of the non-inlined, non-templated member
// functions of the GtoGGSplitFun class.
//
#include "GtoGGSplitFun.h"
#include "Pythia7/Interface/ClassDocumentation.h"
#include "Pythia7/Repository/UseRandom.h"
using namespace Herwig;
GtoGGSplitFun::~GtoGGSplitFun() {}
AbstractClassDescription<GtoGGSplitFun> GtoGGSplitFun::initGtoGGSplitFun;
// Definition of the static class description member.
void GtoGGSplitFun::Init() {
static ClassDocumentation<GtoGGSplitFun> documentation
("This abstract class defines the exact LO splitting function G->GG.");
}
Complex GtoGGSplitFun::fullFun( const double z, const Energy2 qtilde2, const double phi ) {
double val = 0.0;
//***LOOKHERE*** WRITE THE CODE FOR THE LEADING ORDER G->GG
return val;
}
Complex GtoGGSplitFun::integratedFun( const double z, const Energy2 qtilde2 ) {
double val = 3.*sqr(1.-z*(1.-z))/(z*(1.-z));
// Here we write the LO splitting function P(z) for g -> gg
// splittings that is well-known from the text books
// (this is historically important! the first physics - two years
// after the birth of the project - in the Herwig++ shower! Alberto
// & Stefan, 25/04/2002).
return val;
}
Complex GtoGGSplitFun::fullFunWithHelicities( const double z, const Energy2 qtilde2, const double phi, const int h0, const int h1, const int h2 ) {
double val = 0.0;
//***LOOKHERE*** WRITE THE CODE FOR THE LEADING ORDER G->GG
return val;
}
Complex GtoGGSplitFun::integratedFunWithHelicities( const double z, const Energy2 qtilde2, const int h0, const int h1, const int h2 ) {
double val = 0.0;
//***LOOKHERE*** WRITE THE CODE FOR THE LEADING ORDER G->GG
return val;
}
Complex GtoGGSplitFun::overestimateIntegratedFun( const double z ) {
return 3.*(1/z + 1/(1.-z));
}
Complex GtoGGSplitFun::integOverIntegratedFun(const double z) {
return 3.*log(z/(1.-z));
}
Complex GtoGGSplitFun::invIntegOverIntegratedFun(const double r) {
return exp(r/3.)/(1.+exp(r/3.));
}
void GtoGGSplitFun::colourConnection( const ShoColinePair & parentShoColinePair,
ShoColinePair & firstProductShoColinePair,
ShoColinePair & secondProductShoColinePair ) {
// Return immediately if the input is inconsistent.
if ( ! parentShoColinePair.first || ! parentShoColinePair.second ) return;
// Randomly decide which of the two gluon products take the
// colour line passing for the colour of the parent gluon
// (the other will take the one passing for the anticolour of
// the parent gluon).
if ( UseRandom::rndbool() ) {
firstProductShoColinePair.first = parentShoColinePair.first;
secondProductShoColinePair.second = parentShoColinePair.second;
firstProductShoColinePair.second = secondProductShoColinePair.first
= new_ptr( ShowerColourLine() );
} else {
firstProductShoColinePair.second = parentShoColinePair.first;
secondProductShoColinePair.first = parentShoColinePair.second;
firstProductShoColinePair.first = secondProductShoColinePair.second
= new_ptr( ShowerColourLine() );
}
}

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