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Please consider the following formatting changes to #16306 #1

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03f7c8a
include of check for gamma gamma contamination in Dalitz decays
May 19, 2026
e1f84c4
Fix formatting
May 20, 2026
f46a0c2
Please consider the following formatting changes
alibuild May 20, 2026
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28 changes: 28 additions & 0 deletions PWGEM/PhotonMeson/Core/Pi0EtaToGammaGammaMC.h
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Original file line number Diff line number Diff line change
Expand Up @@ -92,6 +92,7 @@ struct Pi0EtaToGammaGammaMC {
o2::framework::Configurable<float> cfgAlphaMeson{"cfgAlphaMeson", 0.65, "photon energy asymmetry distribution parameter for specific value cut"};
o2::framework::Configurable<float> cfgAlphaMesonA{"cfgAlphaMesonA", 0.65, "photon energy asymmetry distribution parameter A for pT dependent cut (A * tanh(B*pT))"};
o2::framework::Configurable<float> cfgAlphaMesonB{"cfgAlphaMesonB", 1.2, "photon energy asymmetry distribution parameter B for pT dependent cut (A * tanh(B*pT))"};
o2::framework::Configurable<bool> cfgGGContaCheck{"cfgGGContaCheck", false, "check gamma gamma contamination of dalitz"};

EMPhotonEventCut fEMEventCut;
struct : o2::framework::ConfigurableGroup {
Expand Down Expand Up @@ -252,6 +253,12 @@ struct Pi0EtaToGammaGammaMC {
f1fd_k0s_to_pi0 = new TF1("f1fd_k0s_to_pi0", TString(fd_k0s_to_pi0), 0.f, 100.f);

fRegistry.add("Event/hNrecPerMCCollision", "Nrec per mc collision;N_{rec} collisions per MC collision", o2::framework::HistType::kTH1F, {{21, -0.5f, 20.5f}}, false);
if (cfgGGContaCheck) {
fRegistry.add("Event/hNGGContamEta", "Number of Eta from etaToGammaGamma; p_{T, #eta} (GeV/#it{c}); N", o2::framework::HistType::kTH1F, {{40, -0.5f, 20.5f}}, false);
fRegistry.add("Event/hNGGContamPion", "Number of Pion from etaToGammaGamma; p_{T, #pi} (GeV/#it{c}); N", o2::framework::HistType::kTH1F, {{40, -0.5f, 20.5f}}, false);
}
fRegistry.add("Event/hNDalitzEtaPt", "Number of DalitzEta; p_{T, #eta} (GeV/#it{c}); N", o2::framework::HistType::kTH1F, {{40, -0.5f, 20.5f}}, false);
fRegistry.add("Event/hNDalitzPionPt", "Number of DalitzPion; p_{T, #pi} (GeV/#it{c}) ; N", o2::framework::HistType::kTH1F, {{40, -0.5f, 20.5f}}, false);

mRunNumber = 0;
d_bz = 0;
Expand Down Expand Up @@ -792,6 +799,25 @@ struct Pi0EtaToGammaGammaMC {

auto pos2mc = mcparticles.iteratorAt(pos2.emmcparticleId());
auto ele2mc = mcparticles.iteratorAt(ele2.emmcparticleId());
if (cfgGGContaCheck) {
photonid2 = o2::aod::pwgem::dilepton::utils::mcutil::FindCommonMotherFrom2Prongs(pos2mc, ele2mc, -11, 11, 22, mcparticles); // check possible contamination
if (photonid2 > 0) {
auto photon2 = mcparticles.iteratorAt(photonid2);
int photon2pdg = photon2.pdgCode();
int photon2mothid = photon2.mothersIds()[0];
auto photon2moth = mcparticles.iteratorAt(photon2mothid);
if (photon2pdg == 22 && (o2::aod::pwgem::photonmeson::utils::mcutil::isGammaGammaDecay(photon2moth, mcparticles))) {
int mothID = o2::aod::pwgem::dilepton::utils::mcutil::getMotherPDGCode(photon2, mcparticles);
if (mothID == 221) {
fRegistry.fill(HIST("Event/hNGGContamEta"), photon2moth.pt());
}
if (mothID == 111) {
fRegistry.fill(HIST("Event/hNGGContamPion"), photon2moth.pt());
}
}
}
}

pi0id = o2::aod::pwgem::dilepton::utils::mcutil::FindCommonMotherFrom3Prongs(g1mc, pos2mc, ele2mc, 22, -11, 11, 111, mcparticles);
etaid = o2::aod::pwgem::dilepton::utils::mcutil::FindCommonMotherFrom3Prongs(g1mc, pos2mc, ele2mc, 22, -11, 11, 221, mcparticles);
if (pi0id < 0 && etaid < 0) {
Expand All @@ -805,12 +831,14 @@ struct Pi0EtaToGammaGammaMC {
}
if (pi0id > 0) {
auto pi0mc = mcparticles.iteratorAt(pi0id);
fRegistry.fill(HIST("Event/hNDalitzPionPt"), pi0mc.pt());
if (cfgRequireTrueAssociation && (pi0mc.emmceventId() != collision.emmceventId())) {
continue;
}
o2::aod::pwgem::photonmeson::utils::nmhistogram::fillTruePairInfo(&fRegistry, veeg, pi0mc, mcparticles, mccollisions, f1fd_k0s_to_pi0, weight);
} else if (etaid > 0) {
auto etamc = mcparticles.iteratorAt(etaid);
fRegistry.fill(HIST("Event/hNDalitzEtaPt"), etamc.pt());
if (cfgRequireTrueAssociation && (etamc.emmceventId() != collision.emmceventId())) {
continue;
}
Expand Down