void Lund_Interface::FillOutgoingParticlesInBlob(Blob *blob)
{
Flavour flav;
Vec4D momentum;
Particle * particle;
int n_q(0), n_g(0); Particle_Vector partons;
for (int j=hepevt.jdahep[0][0]-1;j<hepevt.jdahep[0][1];j++) {
int idhep = hepevt.idhep[j];
flav=IdhepToSherpa(idhep);
momentum=Vec4D(hepevt.phep[j][3],hepevt.phep[j][0],
hepevt.phep[j][1],hepevt.phep[j][2]);
// don't fill blob position vector here, because decay is in CMS until boosting back
particle = new Particle(-1,flav,momentum);
particle->SetNumber(0);
particle->SetStatus(part_status::active);
particle->SetInfo('D');
particle->SetFinalMass(hepevt.phep[j][4]);
blob->AddToOutParticles(particle);
if(abs(idhep)>0 && abs(idhep)<7) {
n_q++;
partons.push_back(particle);
}
else if(abs(idhep)==21) {
n_g++;
partons.push_back(particle);
}
}
size_t n=partons.size();
if(n>0) blob->SetStatus(blob_status::needs_showers);
if(n_q==2 && n_g==0 && n==2) {
if(partons[0]->Flav().IsAnti()) {
partons[0]->SetFlow(2,-1);
partons[1]->SetFlow(1,partons[0]->GetFlow(2));
}
else {
partons[0]->SetFlow(1,-1);
partons[1]->SetFlow(2,partons[0]->GetFlow(1));
}
}
else if(n_q==0 && n_g==2 && n==2) {
partons[0]->SetFlow(2,-1);
partons[0]->SetFlow(1,-1);
partons[1]->SetFlow(2,partons[0]->GetFlow(1));
partons[1]->SetFlow(1,partons[0]->GetFlow(2));
}
else if(n_q==0 && n_g==3 && n==3) {
partons[0]->SetFlow(2,-1);
partons[0]->SetFlow(1,-1);
partons[1]->SetFlow(2,partons[0]->GetFlow(1));
partons[1]->SetFlow(1,-1);
partons[2]->SetFlow(2,partons[1]->GetFlow(1));
partons[2]->SetFlow(1,partons[0]->GetFlow(2));
}
else if(n>0) {
msg_Error()<<METHOD<<" wasn't able to set the color flow for"<<endl<<*blob<<endl;
}
}
void Lund_Interface::FillFragmentationBlob(Blob *blob)
{
Particle *particle;
Flavour flav;
Vec4D momentum, position;
for (int i=0;i<hepevt.nhep;++i) {
if ((hepevt.isthep[i]!=2)&&(hepevt.isthep[i]!=1)&&(hepevt.isthep[i]!=149)) continue;
if (hepevt.idhep[i]==93) flav=Flavour(kf_cluster);
else flav=IdhepToSherpa(hepevt.idhep[i]);
if (flav==Flavour(kf_string) ||
flav==Flavour(kf_cluster)) {
for (int j=hepevt.jdahep[i][0]-1;j<hepevt.jdahep[i][1];j++) {
flav=IdhepToSherpa(hepevt.idhep[j]);
momentum=Vec4D(hepevt.phep[j][3],hepevt.phep[j][0],
hepevt.phep[j][1],hepevt.phep[j][2]);
position=Vec4D(hepevt.vhep[j][3],hepevt.vhep[j][0],
hepevt.vhep[j][1],hepevt.vhep[j][2]);
particle = new Particle(-1,flav,momentum);
particle->SetNumber(0);
particle->SetStatus(part_status::active);
particle->SetInfo('P');
particle->SetFinalMass(hepevt.phep[j][4]);
blob->SetPosition(position);
blob->AddToOutParticles(particle);
}
}
}
blob->SetStatus(blob_status::needs_hadrondecays);
}
size_t Colour_Generator::
SelectColourReplacement(Particle * part1,Particle * part2) {
bool dir(ran->Get()>=0.5),found(false);
size_t beam,index,col,col1,idcol;
for (size_t i=0;i<2;i++) {
beam = dir?i:1-i;
for (index = 1;index<3;index++) {
col = (beam==1?part2:part1)->GetFlow(index);
for (set<int>::iterator cit=m_col[beam][2-index].begin();
cit!=m_col[beam][2-index].end();cit++) {
if (col==(*cit)) {
col1 = (beam==1?part1:part2)->GetFlow(3-index);
if (col1!=0) {
found = false;
for (int i=0;i<m_hadrons[1-beam]->GetParticles().size();i++){
if (m_hadrons[1-beam]->GetParticles()[i]->GetFlow(index)==col &&
m_hadrons[1-beam]->GetParticles()[i]->GetFlow(3-index)!=col1){
found = true;
idcol = m_hadrons[1-beam]->GetParticles()[i]->GetFlow(3-index);
break;
}
}
break;
}
}
}
if (found) break;
}
if (found) break;
}
if (!found) return 0;
p_compensator = new Blob(p_ladder->Position()*rpa->hBar()*rpa->c());
p_compensator->SetId();
p_compensator->SetType(btp::Soft_Collision);
p_compensator->SetTypeSpec("ColourCompensation");
p_compensator->SetStatus(blob_status::inactive);
p_compensator->AddToInParticles((beam==1?part2:part1));
(beam==1?part2:part1)->SetStatus(part_status::decayed);
Particle * gluon = new Particle(-1,Flavour(kf_gluon),Vec4D(0.,0.,0.,0.),'R');
gluon->SetNumber();
gluon->SetFlow(index,col1);
gluon->SetFlow(3-index,col);
if (col1==0 || col1==0)
msg_Error()<<"Error with colours here (4).\n";
gluon->SetStatus(part_status::decayed);
p_compensator->AddToInParticles(gluon);
p_blob->AddToOutParticles(gluon);
Particle * part= new Particle(*((beam==1?part2:part1)));
part->SetNumber();
part->SetFlow(index,col1);
if ((part->Flav().IsGluon() && col1==0) ||
(part->Flav().IsQuark() && part->Flav().IsAnti() &&
index==2 && col1==0) ||
(part->Flav().IsQuark() && !part->Flav().IsAnti() &&
index==1 && col1==0))
msg_Error()<<"Error with colours here (5).\n";
(beam==1?p_ladder->GetIn2():p_ladder->GetIn1())->m_flow.SetCode(index,col1);
(beam==1?p_ladder->GetIn2():p_ladder->GetIn1())->p_part = part;
for (int i=0;i<p_blob->NInP();i++) {
part = p_blob->InParticle(i);
if (part->GetFlow(index)==col && part->GetFlow(3-index)==idcol &&
part->Beam()==(1-beam)){
part->SetFlow(index,col1);
break;
}
if ((part->Flav().IsGluon() && col1==0) ||
(part->Flav().IsQuark() && part->Flav().IsAnti() &&
index==2 && col1==0) ||
(part->Flav().IsQuark() && !part->Flav().IsAnti() &&
index==1 && col1==0))
msg_Error()<<"Error with colours here (6).\n";
}
m_col[beam][2-index].erase(col);
m_col[beam][2-index].insert(col1);
return (beam==1?3-index:index);
}
