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Fix seg fault caused by stale particle indices after coalescence from HF decays #2416

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Fix seg fault caused by stale particle indices after coalescence from HF decays #2416

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a603c0c
Fix seg fault caused by stale particle indices after coalescence from…
alcaliva Jul 23, 2026
359c8f9
Prevent invalid particle index access after decay coalescence
alcaliva Jul 27, 2026
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15 changes: 15 additions & 0 deletions MC/config/common/external/generator/CoalescencePythia8.h
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Original file line number Diff line number Diff line change
Expand Up @@ -152,26 +152,41 @@ bool CoalescencePythia8(Pythia8::Event& event, std::vector<unsigned int> inputPd
for (int iN{0}; iN < neutrons[iC].size(); ++iN) {
if (nuclearMask & (1 << kDeuteron)) {
coalHappened |= doCoal(event, iC, pdgList[kDeuteron], massList[kDeuteron], trivialCoal, coalescenceRadius, nuclFromDecay, protons[iC][iP], neutrons[iC][iN]);
if (nuclFromDecay && coalHappened) {
return true;
}
}
if (nuclearMask & (1 << kTriton)) {
for (int iN2{iN + 1}; iN2 < neutrons[iC].size(); ++iN2) {
coalHappened |= doCoal(event, iC, pdgList[kTriton], massList[kTriton], trivialCoal, coalescenceRadius, nuclFromDecay, protons[iC][iP], neutrons[iC][iN], neutrons[iC][iN2]);
if (nuclFromDecay && coalHappened) {
return true;
}
}
}
if (nuclearMask & (1 << kHe3)) {
for (int iP2{iP + 1}; iP2 < protons[iC].size(); ++iP2) {
coalHappened |= doCoal(event, iC, pdgList[kHe3], massList[kHe3], trivialCoal, coalescenceRadius, nuclFromDecay, protons[iC][iP], protons[iC][iP2], neutrons[iC][iN]);
if (nuclFromDecay && coalHappened) {
return true;
}
}
}
if (nuclearMask & (1 << kHyperTriton)) {
for (int iL{0}; iL < lambdas[iC].size(); ++iL) {
coalHappened |= doCoal(event, iC, pdgList[kHyperTriton], massList[kHyperTriton], trivialCoal, coalescenceRadius, nuclFromDecay, protons[iC][iP], neutrons[iC][iN], lambdas[iC][iL]);
if (nuclFromDecay && coalHappened) {
return true;
}
}
}
if (nuclearMask & (1 << kHe4)) {
for (int iP2{iP + 1}; iP2 < protons[iC].size(); ++iP2) {
for (int iN2{iN + 1}; iN2 < neutrons[iC].size(); ++iN2) {
coalHappened |= doCoal(event, iC, pdgList[kHe4], massList[kHe4], trivialCoal, coalescenceRadius, nuclFromDecay, protons[iC][iP], protons[iC][iP2], neutrons[iC][iN], neutrons[iC][iN2]);
if (nuclFromDecay && coalHappened) {
return true;
}
}
}
}
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