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Consider charge conjugation in decay products in PythiaFilterMultiAncestor #33491

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merged 2 commits into from Apr 27, 2021
Merged

Consider charge conjugation in decay products in PythiaFilterMultiAncestor #33491

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8d2fab7
contemplate charge conjugation in decay products too
rmanzoni Apr 21, 2021
3f2f8ce
code checks
rmanzoni Apr 21, 2021
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15 changes: 14 additions & 1 deletion GeneratorInterface/GenFilters/plugins/PythiaFilterMultiAncestor.cc
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Expand Up @@ -181,6 +181,7 @@ bool PythiaFilterMultiAncestor::filter(edm::StreamID, edm::Event& iEvent, const
// use a counter, if there's enough daughters that match the pdg and kinematic
// criteria accept the event
uint good_dau = 0;
uint good_dau_cc = 0;
for (HepMC::GenVertex::particle_iterator dau = (*p)->end_vertex()->particles_begin(HepMC::children);
dau != (*p)->end_vertex()->particles_end(HepMC::children);
++dau) {
Expand All @@ -198,9 +199,21 @@ bool PythiaFilterMultiAncestor::filter(edm::StreamID, edm::Event& iEvent, const
continue;
++good_dau;
}
// check charge conjugation
if (-(*dau)->pdg_id() == daughterIDs[i]) { // notice minus sign
if ((*dau)->momentum().perp() < daughterMinPts[i])
continue;
if ((*dau)->momentum().perp() > daughterMaxPts[i])
continue;
if ((*dau)->momentum().eta() < daughterMinEtas[i])
continue;
if ((*dau)->momentum().eta() > daughterMaxEtas[i])
continue;
++good_dau_cc;
}
}
}
if (good_dau < daughterIDs.size())
if (good_dau < daughterIDs.size() && good_dau_cc < daughterIDs.size())
accepted = false;
}
}
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