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QtoGQSplitFn.cc
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QtoGQSplitFn.cc
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// -*- C++ -*-
//
// This is the implementation of the non-inlined, non-templated member
// functions of the QtoGQSplitFn class.
//
#include "QtoGQSplitFn.h"
using namespace Herwig;
ClassDescription<QtoGQSplitFn> QtoGQSplitFn::initQtoGQSplitFn;
QtoGQSplitFn::~QtoGQSplitFn() {}
double QtoGQSplitFn::P(const double z, const Energy2 qtilde2,
const IdList &ids) {
Energy m = CurrentGenerator::current().getParticleData(ids[0])->mass();
Energy2 m2 = sqr(m);
// Lets switch everything from z->1-z
//double val = 4./3.*(1. + sqr(z) - 2.*m2/(qtilde2*z))/(1.-z);
double val = 4./3.*(2.*(1.-z)+sqr(z) - 2.*m2/(qtilde2*(1.-z)))/z;
return val;
}
double QtoGQSplitFn::overestimateP(const double z, const IdList &) {
return 8./3./z;
}
double QtoGQSplitFn::integOverP(const double z) { return 8./3.*log(z); }
double QtoGQSplitFn::invIntegOverP(const double r) {
return exp(3.*r/8.);
}
void QtoGQSplitFn::colourConnection(const ShoColinePair &parent,
ShoColinePair &first,
ShoColinePair &second) {
// Return immediately if the input is inconsistent.
if ((!parent.first && !parent.second) || (parent.first && parent.second))
return;
// Initialize
first = second = ShoColinePair();
// The first branching product is considered to be the quark
// and the second the gluon. The colour line of the parent
// is one of the two colour lines of the gluon, whereas the
// other one of the latter is a new colour line which is
// also share by the first product (the quark).
if(parent.first) { // the parent is a quark
second.first = parent.first;
first.first = second.second = new_ptr(ColourLine());
} else if(parent.second) { // the parent is an antiquark
second.second = parent.second;
first.second = second.first = new_ptr(ColourLine());
}
}

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