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Fix seed initialisation of c-deuteron gun and status codes #2389

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Merged
wuctlby merged 1 commit into from
Jun 26, 2026
+13 −4
Merged

Fix seed initialisation of c-deuteron gun and status codes #2389

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17 changes: 13 additions & 4 deletions MC/config/PWGHF/external/generator/generator_pythia8_embed_charmnuclei.C
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,7 @@ class GeneratorPythia8HFEmbedCharmNuclei : public o2::eventgen::GeneratorPythia8
public:

/// constructor
GeneratorPythia8HFEmbedCharmNuclei(int pdgCode = 2010010020, float lifetime = 1.f, int nCharmNucleiPerEvent = 10, float yMin = -1.f, float yMax = 1.f, float ptMax = 25.f, bool trivialCoal = false, float coalMomentum = 0.2, float fracFromB = 0.f)
GeneratorPythia8HFEmbedCharmNuclei(int pdgCode = 2010010020, float lifetime = 1.f, int nCharmNucleiPerEvent = 10, float yMin = -1.f, float yMax = 1.f, float ptMax = 25.f, bool trivialCoal = false, float coalMomentum = 0.2, float fracFromB = 0.f, unsigned int seed = 0u)
{
nNumberOfCharmNucleiPerEvent = nCharmNucleiPerEvent;
mRapidityMinCharmNuclei = yMin;
Expand All @@ -33,6 +33,7 @@ class GeneratorPythia8HFEmbedCharmNuclei : public o2::eventgen::GeneratorPythia8
mFractionFromBeauty = fracFromB;
mPdgCharmNucleus = pdgCode;
mSign = 1;
mUsedSeed = seed;
if (std::abs(mPdgCharmNucleus) == 2010010020) {
mMassCharmNucleus = 3.226f;
} else {
Expand Down Expand Up @@ -63,6 +64,9 @@ class GeneratorPythia8HFEmbedCharmNuclei : public o2::eventgen::GeneratorPythia8
LOG(fatal) << "Failed to init \'GeneratorPythia8\': problems with configuration file " << cfg;
}

mPythiaGun.readString("Random:setSeed = on");
mPythiaGun.readString("Random:seed = " + std::to_string(seed));

if (!mPythiaGun.init()) {
LOG(fatal) << "Failed to init \'GeneratorPythia8\': init returned with error";
}
Expand Down Expand Up @@ -170,7 +174,8 @@ class GeneratorPythia8HFEmbedCharmNuclei : public o2::eventgen::GeneratorPythia8
mPythiaGun.moreDecays();
std::array<int, 2> dausToCoal = {-1, -1};
std::vector<int> pdgShortLivedResos = {313, 2224, 102134};
std::map<int, int> statusResoDecay = {{313, 95}, {2224, 96}, {102134, 97}}; // do not use 94, it is used by default for no resonances
std::map<int, int> statusResoDecay = {{313, -85}, {2224, -86}, {102134, -87}}; // do not use 94, it is used by default for no resonances
std::map<int, int> statusResoDecayFromB = {{313, -95}, {2224, -96}, {102134, -97}}; // do not use 94, it is used by default for no resonances
int whichReso{0};
int idxCharmNucleus{-1};
for (int iPart{0}; iPart<mPythiaGun.event.size(); ++iPart) {
Expand Down Expand Up @@ -245,7 +250,11 @@ class GeneratorPythia8HFEmbedCharmNuclei : public o2::eventgen::GeneratorPythia8
// we try the coalescence here, if successful we copy particles in the pythia event and we move to the next charm nucleus
isCoalSuccess = CoalescencePythia8(mPythiaGun.event, std::vector<unsigned int>{1000010020}, mTrivialCoal, mCoalMomentum, dausToCoal[0], dausToCoal[1], 10.);
if (whichReso > 0) {
mPythiaGun.event[idxCharmNucleus].status(statusResoDecay[whichReso]);
if (isFromB) {
mPythiaGun.event[idxCharmNucleus].status(statusResoDecayFromB[whichReso]);
} else {
mPythiaGun.event[idxCharmNucleus].status(statusResoDecay[whichReso]);
}
}
if (isCoalSuccess) {
restoreEnergyConservation(mPythiaGun.event, idxCharmNucleus);
Expand Down Expand Up @@ -332,8 +341,8 @@ private:
///___________________________________________________________
FairGenerator *GenerateHFEmbedCDeuteron(float lifetime = 1.f, int nCharmNucleiPerEvent = 10, float yMin = -1.f, float yMax = 1.f, float ptMax = 25.f, bool trivialCoal = false, float coalMomentum = 0.2f, float fracFromB = 0.25f)
{
auto myGen = new GeneratorPythia8HFEmbedCharmNuclei(2010010020, lifetime, nCharmNucleiPerEvent, yMin, yMax, ptMax, trivialCoal, coalMomentum, fracFromB);
auto seed = (gRandom->TRandom::GetSeed() % 900000000);
auto myGen = new GeneratorPythia8HFEmbedCharmNuclei(2010010020, lifetime, nCharmNucleiPerEvent, yMin, yMax, ptMax, trivialCoal, coalMomentum, fracFromB, seed);
myGen->readString("Random:setSeed on");
myGen->readString("Random:seed " + std::to_string(seed));
return myGen;
Expand Down
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