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[PWGLF] Refactor weight assignment: use first ancestor to avoid branching logic #13309

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Merged
alcaliva merged 2 commits into from
Oct 9, 2025
Merged

[PWGLF] Refactor weight assignment: use first ancestor to avoid branching logic #13309

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[PWGLF] Refactor weight assignment: use first ancestor to avoid branc…
alcaliva Oct 9, 2025
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fixed whitespace
alcaliva Oct 9, 2025
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111 changes: 66 additions & 45 deletions PWGLF/Tasks/Nuspex/antinucleiInJets.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -500,6 +500,22 @@ struct AntinucleiInJets {
LOGP(info, "Successfully loaded reweighting histograms from CCDB path");
}

// Get first ancestor
aod::McParticle getFirstAncestor(aod::McParticle const& particle, aod::McParticles const& mcParticles)
{
auto current = particle;

while (current.has_mothers()) {
auto motherId = current.mothersIds()[0];
if (motherId < 0 || motherId >= mcParticles.size()) {
break;
}
current = mcParticles.iteratorAt(motherId);
}

return current;
}

// Compute two unit vectors perpendicular to p
void getPerpendicularAxis(const TVector3& p, TVector3& u, double sign)
{
Expand Down Expand Up @@ -1428,56 +1444,61 @@ struct AntinucleiInJets {
registryMC.fill(HIST("antip_prim_low"), track.pt(), wPrimLow);
}

// Secondary antiprotons from week decays
// Secondary antiprotons from material
if (!particle.isPhysicalPrimary() && !particle.has_mothers()) {

// Fill histograms
registryMC.fill(HIST("antip_sec_pythia"), track.pt());
registryMC.fill(HIST("antip_sec_std"), track.pt());
registryMC.fill(HIST("antip_sec_up"), track.pt());
registryMC.fill(HIST("antip_sec_low"), track.pt());
}

// Secondary antiprotons from weak decays
if (!particle.isPhysicalPrimary() && particle.has_mothers()) {

// Initialize weights
// Get first ancestor
auto ancestor = getFirstAncestor(particle, mcParticles);
double wSecStd(1.0), wSecUp(1.0), wSecLow(1.0);
auto mother = mcParticles.iteratorAt(particle.mothersIds()[0]);

// Antiprotons from sigma
if (std::abs(mother.pdgCode()) == PDG_t::kSigmaBarMinus) {
if (mother.pt() < primaryAntiSigma->GetXaxis()->GetXmax()) {
int ipt = primaryAntiSigma->FindBin(mother.pt());
wSecStd = primaryAntiSigma->GetBinContent(ipt);
wSecUp = wSecStd + primaryAntiSigma->GetBinError(ipt);
wSecLow = wSecStd - primaryAntiSigma->GetBinError(ipt);
}

// Antiprotons from antiSigma
if (ancestor.pdgCode() == PDG_t::kSigmaBarMinus && ancestor.pt() < primaryAntiSigma->GetXaxis()->GetXmax()) {
int ipt = primaryAntiSigma->FindBin(ancestor.pt());
wSecStd = primaryAntiSigma->GetBinContent(ipt);
wSecUp = wSecStd + primaryAntiSigma->GetBinError(ipt);
wSecLow = wSecStd - primaryAntiSigma->GetBinError(ipt);
}

// Antiprotons from antiLambda0
if (ancestor.pdgCode() == PDG_t::kLambda0Bar && ancestor.pt() < primaryAntiLambda->GetXaxis()->GetXmax()) {
int ipt = primaryAntiLambda->FindBin(ancestor.pt());
wSecStd = primaryAntiLambda->GetBinContent(ipt);
wSecUp = wSecStd + primaryAntiLambda->GetBinError(ipt);
wSecLow = wSecStd - primaryAntiLambda->GetBinError(ipt);
}

// Antiprotons from antiXi
if (ancestor.pdgCode() == PDG_t::kXiPlusBar && ancestor.pt() < primaryAntiXi->GetXaxis()->GetXmax()) {
int ipt = primaryAntiXi->FindBin(ancestor.pt());
wSecStd = primaryAntiXi->GetBinContent(ipt);
wSecUp = wSecStd + primaryAntiXi->GetBinError(ipt);
wSecLow = wSecStd - primaryAntiXi->GetBinError(ipt);
}

// Antiprotons from antiXi0
if (ancestor.pdgCode() == -o2::constants::physics::Pdg::kXi0 && ancestor.pt() < primaryAntiXi->GetXaxis()->GetXmax()) {
int ipt = primaryAntiXi->FindBin(ancestor.pt());
wSecStd = primaryAntiXi->GetBinContent(ipt);
wSecUp = wSecStd + primaryAntiXi->GetBinError(ipt);
wSecLow = wSecStd - primaryAntiXi->GetBinError(ipt);
}

// Antiprotons from primary Lambda0
if (std::abs(mother.pdgCode()) == kLambda0Bar) {
if (mother.isPhysicalPrimary()) {
if (mother.pt() < primaryAntiLambda->GetXaxis()->GetXmax()) {
int ipt = primaryAntiLambda->FindBin(mother.pt());
wSecStd = primaryAntiLambda->GetBinContent(ipt);
wSecUp = wSecStd + primaryAntiLambda->GetBinError(ipt);
wSecLow = wSecStd - primaryAntiLambda->GetBinError(ipt);
}
}

// Antiprotons from secondary Lambda0 (Xi -> Lambda0)
if (!mother.isPhysicalPrimary()) {
auto grandmother = mcParticles.iteratorAt(mother.mothersIds()[0]);
if (std::abs(grandmother.pdgCode()) == kXiMinus) {
if (grandmother.pt() < primaryAntiXi->GetXaxis()->GetXmax()) {
int ipt = primaryAntiXi->FindBin(grandmother.pt());
wSecStd = primaryAntiXi->GetBinContent(ipt);
wSecUp = wSecStd + primaryAntiXi->GetBinError(ipt);
wSecLow = wSecStd - primaryAntiXi->GetBinError(ipt);
}
}

// Antiprotons from secondary Lambda0 (Omega -> Lambda0)
if (std::abs(grandmother.pdgCode()) == kOmegaMinus) {
if (grandmother.pt() < primaryAntiOmega->GetXaxis()->GetXmax()) {
int ipt = primaryAntiOmega->FindBin(grandmother.pt());
wSecStd = primaryAntiOmega->GetBinContent(ipt);
wSecUp = wSecStd + primaryAntiOmega->GetBinError(ipt);
wSecLow = wSecStd - primaryAntiOmega->GetBinError(ipt);
}
}
}
// Antiprotons from antiOmega
if (ancestor.pdgCode() == PDG_t::kOmegaPlusBar && ancestor.pt() < primaryAntiOmega->GetXaxis()->GetXmax()) {
int ipt = primaryAntiOmega->FindBin(ancestor.pt());
wSecStd = primaryAntiOmega->GetBinContent(ipt);
wSecUp = wSecStd + primaryAntiOmega->GetBinError(ipt);
wSecLow = wSecStd - primaryAntiOmega->GetBinError(ipt);
}

// Fill histograms
Expand Down
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