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[PWGUD] preslice particles #15776

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Merged
amatyja merged 7 commits into from
Apr 15, 2026
+11 −2
Merged

[PWGUD] preslice particles #15776

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d616170
add event consistency flag
miedema-11 Apr 2, 2026
913605e
add event consistency flag
miedema-11 Apr 2, 2026
7290de7
MC analysis for flow
miedema-11 Apr 2, 2026
9c3c820
use get track size
miedema-11 Apr 8, 2026
1f5dbfc
Merge branch 'master' of github.com:miedema-11/O2Physics
miedema-11 Apr 8, 2026
1a85369
preslice particles
miedema-11 Apr 15, 2026
98b1c0b
Merge branch 'master' into master
miedema-11 Apr 15, 2026
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13 changes: 11 additions & 2 deletions PWGUD/Tasks/flowMcUpc.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -109,6 +109,8 @@ struct FlowMcUpc {
return true;
}

PresliceUnsorted<aod::UDMcParticles> partPerMcCollision = aod::udmcparticle::udMcCollisionId;

void processMCTrue(aod::UDMcCollisions::iterator const& mcCollision, McParts const& mcParts, aod::BCs const& bcs)
{
if (bcs.size() == 0) {
Expand All @@ -122,7 +124,9 @@ struct FlowMcUpc {
// event within range
histos.fill(HIST("hImpactParameter"), imp);

for (auto const& mcParticle : mcParts) {
auto const& tempParts = mcParts.sliceBy(partPerMcCollision, static_cast<int64_t>(mcCollision.globalIndex()));

for (auto const& mcParticle : tempParts) {
auto momentum = std::array<double, 3>{mcParticle.px(), mcParticle.py(), mcParticle.pz()};
int pdgCode = std::abs(mcParticle.pdgCode());

Expand All @@ -147,6 +151,9 @@ struct FlowMcUpc {
using MCRecoTracks = soa::Join<aod::UDTracks, aod::UDTracksPID, aod::UDTracksExtra, aod::UDTracksFlags, aod::UDTracksDCA, aod::UDMcTrackLabels>;
using MCRecoCollisions = soa::Join<aod::UDCollisions, aod::SGCollisions, aod::UDCollisionSelExtras, aod::UDCollisionsSels, aod::UDZdcsReduced, aod::UDMcCollsLabels>;

// PresliceUnsorted<MCRecoTracks> trackPerMcParticle = aod::udmctracklabel::udMcParticleId;
Preslice<MCRecoTracks> trackPerCollision = aod::udtrack::udCollisionId; // sorted preslice used because the pair track-collision is already sorted in processDataSG function

void processReco(MCRecoCollisions::iterator const& collision, MCRecoTracks const& tracks)
{
histos.fill(HIST("RecoProcessEventCounter"), 0.5);
Expand All @@ -162,7 +169,9 @@ struct FlowMcUpc {

float vtxz = collision.posZ();

for (const auto& track : tracks) {
auto const& tempTracks = tracks.sliceBy(trackPerCollision, static_cast<int64_t>(collision.globalIndex()));

for (const auto& track : tempTracks) {
// focus on bulk: e, mu, pi, k, p
auto momentum = std::array<double, 3>{track.px(), track.py(), track.pz()};
double pt = RecoDecay::pt(momentum);
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