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Allow multiple nuclei per event #1896

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Merged
njacazio merged 1 commit into from
Feb 4, 2025
Merged

Allow multiple nuclei per event #1896

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19 changes: 9 additions & 10 deletions MC/config/PWGLF/pythia8/generator_pythia8_coalescence.C
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Original file line number Diff line number Diff line change
Expand Up @@ -104,6 +104,10 @@ protected:
const double coalescenceRadius{0.5 * 1.122462 * mCoalMomentum}; /// 1.122462 [2^(1/6)] from PRL 126, 101101 (2021), only for 3 body coalescence

auto coalescence = [&](int iC, int pdgCode, float mass, int iD1, int iD2, int iD3) {
if (event[iD1].status() < 0 || event[iD2].status() < 0 || event[iD3].status() < 0)
{
return false;
}
auto p1 = event[iD1].p();
auto p2 = event[iD2].p();
auto p3 = event[iD3].p();
Expand Down Expand Up @@ -131,32 +135,27 @@ protected:
return false;
};

bool coalHappened = false;
for (int iC{0}; iC < 2; ++iC)
{
for (int iP{0}; iP < protons[iC].size(); ++iP) {
for (int iN{0}; iN < neutrons[iC].size(); ++iN) {
/// H3L loop
for (int iL{0}; iL < lambdas[iC].size(); ++iL) {
if (coalescence(iC, 1010010030, 2.991134, protons[iC][iP], neutrons[iC][iN], lambdas[iC][iL])) {
return true;
}
coalHappened |= coalescence(iC, 1010010030, 2.991134, protons[iC][iP], neutrons[iC][iN], lambdas[iC][iL]);
}
/// H3 loop
for (int iN2{iN + 1}; iN2 < neutrons[iC].size(); ++iN2) {
if (coalescence(iC, 1000010030, 2.80892113298, protons[iC][iP], neutrons[iC][iN], neutrons[iC][iN2])) {
return true;
}
coalHappened |= coalescence(iC, 1000010030, 2.80892113298, protons[iC][iP], neutrons[iC][iN], neutrons[iC][iN2]);
}
/// He3 loop
for (int iP2{iP + 1}; iP2 < protons[iC].size(); ++iP2) {
if (coalescence(iC, 1000020030, 2.808391, protons[iC][iP], protons[iC][iP2], neutrons[iC][iN])) {
return true;
}
coalHappened |= coalescence(iC, 1000020030, 2.808391, protons[iC][iP], protons[iC][iP2], neutrons[iC][iN]);
}
}
}
}
return false;
return coalHappened;
}

private:
Expand Down