Skip to content

[PWGEM] Adding histograms for accepted pi0 and eta into gamma gamma decay cha… #15465

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
mhemmer-cern merged 2 commits into from
Mar 23, 2026
Merged

[PWGEM] Adding histograms for accepted pi0 and eta into gamma gamma decay cha… #15465

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
f1345fe
Adding histograms for accepted pi0 and eta into gamma gamma decay cha…
amaringarcia Mar 20, 2026
57b99fc
Adding histograms for accepted pi0 and eta into gamma gamma decay cha…
amaringarcia Mar 23, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
32 changes: 32 additions & 0 deletions PWGEM/PhotonMeson/TableProducer/associateMCinfoPhoton.cxx
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -65,6 +65,7 @@ struct AssociateMCInfoPhoton {
Configurable<float> margin_z_gen{"margin_z_gen", 15.f, "margin for Z of true photon conversion point to store generated information"};
Configurable<float> max_rxy_gen{"max_rxy_gen", 100, "max rxy to store generated information"};
Configurable<bool> requireGammaGammaDecay{"requireGammaGammaDecay", false, "require gamma gamma decay for generated pi0 and eta meson"};
Configurable<float> cfg_max_eta_photon{"cfg_max_eta_gamma", 0.8, "max eta for photons at PV"};

HistogramRegistry registry{"EMMCEvent"};

Expand Down Expand Up @@ -98,6 +99,7 @@ struct AssociateMCInfoPhoton {

for (uint i = 0; i < NParticleNames; i++) {
registry.add<TH2>(Form("Generated/h2PtY_%s", ParticleNames[i].data()), Form("Generated %s", ParticleNames[i].data()), kTH2F, {axisPt, axisRapidity}, true);
registry.add<TH2>(Form("Generated/h2PtY_Accepted_%s", ParticleNames[i].data()), Form("Generated %s", ParticleNames[i].data()), kTH2F, {axisPt, axisRapidity}, true);
}

// reserve space for generated vectors if that process enabled
Expand Down Expand Up @@ -170,6 +172,15 @@ struct AssociateMCInfoPhoton {
for (const auto& mcParticle : groupedMcParticles) { // store necessary information for denominator of efficiency
if ((mcParticle.isPhysicalPrimary() || mcParticle.producedByGenerator()) && std::fabs(mcParticle.y()) < 0.9f && mcParticle.pt() < 20.f) {
auto binNumber = hBinFinder->FindBin(mcParticle.pt(), std::fabs(mcParticle.y())); // caution: pack

bool isMesonAccepted = false;
if (mcParticle.has_daughters()) {
auto lDaughters = mcParticle.daughters_as<aod::McParticles>();

if (areTwoPhotonDaughtersAccepted(lDaughters, cfg_max_eta_photon)) {
isMesonAccepted = true;
}
}
switch (std::abs(mcParticle.pdgCode())) {
case PDG_t::kGamma:
registry.fill(HIST("Generated/h2PtY_Gamma"), mcParticle.pt(), std::fabs(mcParticle.y()));
Expand All @@ -180,12 +191,18 @@ struct AssociateMCInfoPhoton {
continue;
registry.fill(HIST("Generated/h2PtY_Pi0"), mcParticle.pt(), std::fabs(mcParticle.y()));
genPi0[binNumber]++;
if (isMesonAccepted) {
registry.fill(HIST("Generated/h2PtY_Accepted_Pi0"), mcParticle.pt(), std::fabs(mcParticle.y()));
}
break;
case Pdg::kEta:
if (requireGammaGammaDecay && !isGammaGammaDecay(mcParticle, mcParticles))
continue;
registry.fill(HIST("Generated/h2PtY_Eta"), mcParticle.pt(), std::fabs(mcParticle.y()));
genEta[binNumber]++;
if (isMesonAccepted) {
registry.fill(HIST("Generated/h2PtY_Accepted_Eta"), mcParticle.pt(), std::fabs(mcParticle.y()));
}
break;
default:
break;
Expand Down Expand Up @@ -492,6 +509,21 @@ struct AssociateMCInfoPhoton {
fCounters[1] = 0;
} // end of skimmingMC

template <typename Daughters>
inline bool areTwoPhotonDaughtersAccepted(const Daughters& lDaughters, float maxEta)
{
if (lDaughters.size() != 2) {
return false;
}

auto it0 = lDaughters.begin();
auto it1 = it0;
++it1;

return (std::fabs(it0.eta()) < maxEta &&
std::fabs(it1.eta()) < maxEta);
}

void processMC_PCM(MyCollisionsMC const& collisions, aod::BCs const& bcs, aod::McCollisions const& mccollisions, aod::McParticles const& mcParticles, TracksMC const& o2tracks, aod::V0PhotonsKF const& v0photons, aod::V0Legs const& v0legs)
{
skimmingMC<kPCM>(collisions, bcs, mccollisions, mcParticles, o2tracks, nullptr, v0photons, v0legs, nullptr, nullptr, nullptr);
Expand Down
Loading