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MEQq2Qq.cc
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MEQq2Qq.cc
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// -*- C++ -*-
//
// This is the implementation of the non-inlined, non-templated member
// functions of the MEQq2Qq class.
//
#include "MEQq2Qq.h"
#include "ThePEG/Interface/ClassDocumentation.h"
#include "ThePEG/PDT/EnumParticles.h"
#ifdef ThePEG_TEMPLATES_IN_CC_FILE
// #include "MEQq2Qq.tcc"
#endif
using namespace ThePEG;
MEQq2Qq::~MEQq2Qq() {}
void MEQq2Qq::getDiagrams() const {
tcPDPtr g = getParticleData(ParticleID::g);
for ( int i = 1; i <= maxFlavour(); ++i ) {
tcPDPtr q = getParticleData(i);
tcPDPtr qb = q->CC();
for ( int j = 1; j <= maxFlavour(); ++j ) {
if ( i == j ) continue;
tcPDPtr qp = getParticleData(j);
tcPDPtr qbp = qp->CC();
add(new_ptr((Tree2toNDiagram(3), q, g, qp, 1, q, 2, qp, -1)));
add(new_ptr((Tree2toNDiagram(3), qb, g, qp, 1, qb, 2, qp, -2)));
add(new_ptr((Tree2toNDiagram(3), q, g, qbp, 1, q, 2, qbp, -3)));
add(new_ptr((Tree2toNDiagram(3), qb, g, qbp, 1, qb, 2, qbp, -4)));
}
}
}
double MEQq2Qq::me2() const {
return comfac()*colA()*KfacA()*2.0/9.0;
}
Selector<const ColourLines *>
MEQq2Qq::colourGeometries(tcDiagPtr diag) const {
static ColourLines ctUT("1 -2 5, 3 2 4");
static ColourLines ctST("3 2 -1, -4 -2 5");
static ColourLines ctTS("1 -2 -3, -5 2 4");
static ColourLines ctTU("-4 -2 -3, -5 2 -1");
Selector<const ColourLines *> sel;
if ( diag->id() == -1 )
sel.insert(1.0, &ctUT);
else if ( diag->id() == -2 )
sel.insert(1.0, &ctST);
else if ( diag->id() == -3 )
sel.insert(1.0, &ctTS);
else if ( diag->id() == -4 )
sel.insert(1.0, &ctTU);
return sel;
}
Selector<MEQq2Qq::DiagramIndex>
MEQq2Qq::diagrams(const DiagramVector & diags) const {
Selector<DiagramIndex> sel;
for ( DiagramIndex i = 0; i < diags.size(); ++i )
if ( diags[i]->id() == -1 || diags[i]->id() == -2 ||
diags[i]->id() == -3 || diags[i]->id() == -4 ) sel.insert(1.0, i);
return sel;
}
NoPIOClassDescription<MEQq2Qq> MEQq2Qq::initMEQq2Qq;
// Definition of the static class description member.
void MEQq2Qq::Init() {
static ClassDocumentation<MEQq2Qq> documentation
("The ThePEG::MEQq2Qq class describes the standard QCD "
"\\f$qq' \\rightarrow qq'\\f$ matrix element.");
}

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