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[PWGEM] Add option to save Dalitz and two-gamma events #18363

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Merged
jokonig merged 1 commit into from
Oct 20, 2026
Merged

[PWGEM] Add option to save Dalitz and two-gamma events #18363

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11 changes: 9 additions & 2 deletions PWGEM/PhotonMeson/TableProducer/skimmerDalitzEvents.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,7 @@ struct skimmerDalitzEvents {

Configurable<unsigned int> minNElecCand{"minNElecCand", 2, "minimum number of electrons/positron candidates in one event"};
Configurable<unsigned int> minNGammaCand{"minNGammaCand", 1, "minimum number of V0 photon candidates in one event"};
Configurable<bool> accPCMGGAndDalitz{"accPCMGGAndDalitz", false, "set to true if you want to create DD for both PCM-PCM and PCM-Dalitz"};

// ---------- for data ----------
template <bool isMC, o2::soa::is_table TElectrons, o2::soa::is_table TV0Photons, o2::soa::is_table TV0Legs>
Expand All @@ -71,18 +72,24 @@ struct skimmerDalitzEvents {
auto tracks = emPrimaryElecTmp.sliceBy(perCollisionEl, collision.globalIndex());

// check that there are at least minNElecCand in the collision
if (tracks.size() < minNElecCand) {
if (!accPCMGGAndDalitz && tracks.size() < minNElecCand) {
continue;
}

// get photons for current collision
auto photonskf = v0photonskfTmp.sliceBy(perCol_pcm, collision.globalIndex());

// check that there are at least minNGammaCand in the collision
if (photonskf.size() < minNGammaCand) {
if (!accPCMGGAndDalitz && photonskf.size() < minNGammaCand) {
continue;
}

if (accPCMGGAndDalitz) {
if (!(photonskf.size() >= 2 || (tracks.size() >= 2 && photonskf.size() >= 1))) { // o2-linter: disable=magic-number (settings to obtain either two photons in the event or one photon with one dielectron)
continue;
}
}

// Write electron tracks
for (const auto& track : tracks) {
emprimaryelectrons(track.collisionId(), track.trackId(), track.sign(),
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