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[PWGLF] Replaced the loop over all MC particles with a loop over pre-filtered strange hadrons #12862

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Merged
alcaliva merged 2 commits into from
Sep 4, 2025
Merged

[PWGLF] Replaced the loop over all MC particles with a loop over pre-filtered strange hadrons #12862

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[PWGLF] Replaced the loop over all MC particles with a loop over pre-…
alcaliva Sep 4, 2025
61b7eb2
fixed whitespace
alcaliva Sep 4, 2025
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68 changes: 39 additions & 29 deletions PWGLF/Tasks/Strangeness/strangenessInJets.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -1002,6 +1002,10 @@ struct StrangenessInJets {
// MC particles per collision
auto mcParticlesPerColl = mcParticles.sliceBy(perMCCollision, collision.globalIndex());

// Store strange hadron pdg code and momentum
std::vector<int> pdg;
std::vector<TVector3> strHadronMomentum;

// Loop over all MC particles and select physical primaries within acceptance
std::vector<fastjet::PseudoJet> fjParticles;
for (const auto& particle : mcParticlesPerColl) {
Expand All @@ -1016,6 +1020,13 @@ struct StrangenessInJets {
fastjet::PseudoJet fourMomentum(particle.px(), particle.py(), particle.pz(), energy);
fourMomentum.set_user_index(particle.pdgCode());
fjParticles.emplace_back(fourMomentum);

// Store properties of strange hadrons
int pdgAbs = std::abs(particle.pdgCode());
if (pdgAbs == kK0Short || pdgAbs == kLambda0 || pdgAbs == kXiMinus || pdgAbs == kOmegaMinus) {
pdg.emplace_back(particle.pdgCode());
strHadronMomentum.emplace_back(particle.px(), particle.py(), particle.pz());
}
}

// Skip events with no particles
Expand Down Expand Up @@ -1055,48 +1066,47 @@ struct StrangenessInJets {
getPerpendicularAxis(jetAxis, ueAxis1, +1);
getPerpendicularAxis(jetAxis, ueAxis2, -1);

// Loop over MC particles
for (const auto& particle : mcParticlesPerColl) {
if (!particle.isPhysicalPrimary())
continue;
double minPtParticle = 0.1;
if (particle.eta() < etaMin || particle.eta() > etaMax || particle.pt() < minPtParticle)
continue;
// Loop over strange hadrons
int index = -1;
for (const auto& hadron : strHadronMomentum) {

// Particle index
index++;

// Compute distance of particles from jet and UE axes
double deltaEtaJet = particle.eta() - jetAxis.Eta();
double deltaPhiJet = getDeltaPhi(particle.phi(), jetAxis.Phi());
double deltaEtaJet = hadron.Eta() - jetAxis.Eta();
double deltaPhiJet = getDeltaPhi(hadron.Phi(), jetAxis.Phi());
double deltaRJet = std::sqrt(deltaEtaJet * deltaEtaJet + deltaPhiJet * deltaPhiJet);
double deltaEtaUe1 = particle.eta() - ueAxis1.Eta();
double deltaPhiUe1 = getDeltaPhi(particle.phi(), ueAxis1.Phi());
double deltaEtaUe1 = hadron.Eta() - ueAxis1.Eta();
double deltaPhiUe1 = getDeltaPhi(hadron.Phi(), ueAxis1.Phi());
double deltaRUe1 = std::sqrt(deltaEtaUe1 * deltaEtaUe1 + deltaPhiUe1 * deltaPhiUe1);
double deltaEtaUe2 = particle.eta() - ueAxis2.Eta();
double deltaPhiUe2 = getDeltaPhi(particle.phi(), ueAxis2.Phi());
double deltaEtaUe2 = hadron.Eta() - ueAxis2.Eta();
double deltaPhiUe2 = getDeltaPhi(hadron.Phi(), ueAxis2.Phi());
double deltaRUe2 = std::sqrt(deltaEtaUe2 * deltaEtaUe2 + deltaPhiUe2 * deltaPhiUe2);

// Select particles inside jet
if (deltaRJet < coneRadius) {
switch (particle.pdgCode()) {
switch (pdg[index]) {
case kK0Short:
registryMC.fill(HIST("K0s_generated_jet"), genMultiplicity, particle.pt());
registryMC.fill(HIST("K0s_generated_jet"), genMultiplicity, hadron.Pt());
break;
case kLambda0:
registryMC.fill(HIST("Lambda_generated_jet"), genMultiplicity, particle.pt());
registryMC.fill(HIST("Lambda_generated_jet"), genMultiplicity, hadron.Pt());
break;
case kLambda0Bar:
registryMC.fill(HIST("AntiLambda_generated_jet"), genMultiplicity, particle.pt());
registryMC.fill(HIST("AntiLambda_generated_jet"), genMultiplicity, hadron.Pt());
break;
case kXiMinus:
registryMC.fill(HIST("XiNeg_generated_jet"), genMultiplicity, particle.pt());
registryMC.fill(HIST("XiNeg_generated_jet"), genMultiplicity, hadron.Pt());
break;
case kXiPlusBar:
registryMC.fill(HIST("XiPos_generated_jet"), genMultiplicity, particle.pt());
registryMC.fill(HIST("XiPos_generated_jet"), genMultiplicity, hadron.Pt());
break;
case kOmegaMinus:
registryMC.fill(HIST("OmegaNeg_generated_jet"), genMultiplicity, particle.pt());
registryMC.fill(HIST("OmegaNeg_generated_jet"), genMultiplicity, hadron.Pt());
break;
case kOmegaPlusBar:
registryMC.fill(HIST("OmegaPos_generated_jet"), genMultiplicity, particle.pt());
registryMC.fill(HIST("OmegaPos_generated_jet"), genMultiplicity, hadron.Pt());
break;
default:
break;
Expand All @@ -1105,27 +1115,27 @@ struct StrangenessInJets {

// Select particles inside UE cones
if (deltaRUe1 < coneRadius || deltaRUe2 < coneRadius) {
switch (particle.pdgCode()) {
switch (pdg[index]) {
case kK0Short:
registryMC.fill(HIST("K0s_generated_ue"), genMultiplicity, particle.pt());
registryMC.fill(HIST("K0s_generated_ue"), genMultiplicity, hadron.Pt());
break;
case kLambda0:
registryMC.fill(HIST("Lambda_generated_ue"), genMultiplicity, particle.pt());
registryMC.fill(HIST("Lambda_generated_ue"), genMultiplicity, hadron.Pt());
break;
case kLambda0Bar:
registryMC.fill(HIST("AntiLambda_generated_ue"), genMultiplicity, particle.pt());
registryMC.fill(HIST("AntiLambda_generated_ue"), genMultiplicity, hadron.Pt());
break;
case kXiMinus:
registryMC.fill(HIST("XiNeg_generated_ue"), genMultiplicity, particle.pt());
registryMC.fill(HIST("XiNeg_generated_ue"), genMultiplicity, hadron.Pt());
break;
case kXiPlusBar:
registryMC.fill(HIST("XiPos_generated_ue"), genMultiplicity, particle.pt());
registryMC.fill(HIST("XiPos_generated_ue"), genMultiplicity, hadron.Pt());
break;
case kOmegaMinus:
registryMC.fill(HIST("OmegaNeg_generated_ue"), genMultiplicity, particle.pt());
registryMC.fill(HIST("OmegaNeg_generated_ue"), genMultiplicity, hadron.Pt());
break;
case kOmegaPlusBar:
registryMC.fill(HIST("OmegaPos_generated_ue"), genMultiplicity, particle.pt());
registryMC.fill(HIST("OmegaPos_generated_ue"), genMultiplicity, hadron.Pt());
break;
default:
break;
Expand Down
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