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[PWGHF] Fixed generated invariant mass calculation #13185

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Merged
fgrosa merged 2 commits into from
Oct 1, 2025
Merged

[PWGHF] Fixed generated invariant mass calculation #13185

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54e8364
Fixed generated invariant mass calculation
Luca610 Sep 30, 2025
da31f19
Casting to float
Luca610 Oct 1, 2025
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3 changes: 2 additions & 1 deletion PWGHF/D2H/TableProducer/candidateCreatorCharmResoReduced.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -389,10 +389,11 @@ struct HfCandidateCreatorCharmResoReduced {
if (TESTBIT(candV0Tr.v0Type(), V0Type::Lambda)) {
invMassV0Tr = candV0Tr.invMassLambda();
signReso = candD.sign();
isWrongSign = candD.sign() < 0 ? 1 : 0;
} else if (TESTBIT(candV0Tr.v0Type(), V0Type::AntiLambda)) {
invMassV0Tr = candV0Tr.invMassAntiLambda();
signReso = candD.sign();
isWrongSign = 1;
isWrongSign = candD.sign() > 0 ? 1 : 0;
}
if (useDeltaMass) {
invMassReso = RecoDecay::m(std::array{pVectorCharmProngs[0], pVectorCharmProngs[1], pVectorCharmProngs[2], pVecV0Tr}, std::array{MassPiPlus, MassKPlus, MassPiPlus, MassLambda}) - invMassD;
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25 changes: 18 additions & 7 deletions PWGHF/D2H/TableProducer/dataCreatorCharmResoReduced.cxx
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Expand Up @@ -620,6 +620,17 @@ struct HfDataCreatorCharmResoReduced {
return flagV0; // Placeholder, should return the actual flag based on matching logic
}

template <typename PParticles>
float computeInvMassGen(PParticles const& particlesMc, int indexRec)
{
auto particleReso = particlesMc.iteratorAt(indexRec);
auto dau1 = particlesMc.iteratorAt(particleReso.daughtersIds().front());
auto dau2 = particlesMc.iteratorAt(particleReso.daughtersIds().back());
std::array<std::array<float, 3>, 2> pArr = {{{dau1.px(), dau1.py(), dau1.pz()}, {dau2.px(), dau2.py(), dau2.pz()}}};
Comment on lines +627 to +629
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@fgrosa fgrosa Sep 30, 2025

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you can consider to loop on daughters, to generalise in case of more than 2 daughters

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@Luca610 Luca610 Oct 1, 2025

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RecoDecay::m takes fixed length arrays as input, that's way I ended up implementing it only for 2 prongs

std::array<float, 2> mArr = {static_cast<float>(pdg->Mass(dau1.pdgCode())), static_cast<float>(pdg->Mass(dau2.pdgCode()))};
return static_cast<float>(RecoDecay::m(pArr, mArr));
}

/// Function for filling MC reco information of DV0 candidates in the tables
/// \tparam dType is the D meson type (Dstar, Dplus or D0)
/// \param particlesMc is the table with MC particles
Expand Down Expand Up @@ -690,7 +701,7 @@ struct HfDataCreatorCharmResoReduced {
if (indexRec > -1) {
auto particleReso = particlesMc.iteratorAt(indexRec);
ptGen = particleReso.pt();
invMassGen = RecoDecay::m(particleReso.p(), particleReso.e());
invMassGen = computeInvMassGen(particlesMc, indexRec);
}
rowHfDstarV0McRecReduced(indexHfCandCharm, indexCandV0Bach,
flagReso, flagCharmBach,
Expand Down Expand Up @@ -743,7 +754,7 @@ struct HfDataCreatorCharmResoReduced {
if (indexRec > -1) {
auto particleReso = particlesMc.iteratorAt(indexRec);
ptGen = particleReso.pt();
invMassGen = RecoDecay::m(particleReso.p(), particleReso.e());
invMassGen = computeInvMassGen(particlesMc, indexRec);
}
rowHf3PrV0McRecReduced(indexHfCandCharm, indexCandV0Bach,
flagReso, flagCharmBach,
Expand Down Expand Up @@ -784,7 +795,7 @@ struct HfDataCreatorCharmResoReduced {
if (indexRec > -1) {
auto particleReso = particlesMc.iteratorAt(indexRec);
ptGen = particleReso.pt();
invMassGen = RecoDecay::m(particleReso.p(), particleReso.e());
invMassGen = computeInvMassGen(particlesMc, indexRec);
}
rowHf2PrV0McRecReduced(indexHfCandCharm, indexCandV0Bach,
flagReso, flagCharmBach,
Expand Down Expand Up @@ -874,7 +885,7 @@ struct HfDataCreatorCharmResoReduced {
if (indexRec > -1) {
auto particleReso = particlesMc.iteratorAt(indexRec);
ptGen = particleReso.pt();
invMassGen = RecoDecay::m(particleReso.p(), particleReso.e());
invMassGen = computeInvMassGen(particlesMc, indexRec);
}
rowHfDstarTrkMcRecReduced(indexHfCandCharm, indexCandTrBach,
flagReso, flagCharmBach,
Expand Down Expand Up @@ -914,7 +925,7 @@ struct HfDataCreatorCharmResoReduced {
if (indexRec > -1) {
auto particleReso = particlesMc.iteratorAt(indexRec);
ptGen = particleReso.pt();
invMassGen = RecoDecay::m(particleReso.p(), particleReso.e());
invMassGen = computeInvMassGen(particlesMc, indexRec);
}
rowHf3PrTrkMcRecReduced(indexHfCandCharm, indexCandTrBach,
flagReso, flagCharmBach,
Expand Down Expand Up @@ -961,7 +972,7 @@ struct HfDataCreatorCharmResoReduced {
if (indexRec > -1) {
auto particleReso = particlesMc.iteratorAt(indexRec);
ptGen = particleReso.pt();
invMassGen = RecoDecay::m(particleReso.p(), particleReso.e());
invMassGen = computeInvMassGen(particlesMc, indexRec);
}
rowHf2PrTrkMcRecReduced(indexHfCandCharm, indexCandTrBach,
flagReso, flagCharmBach,
Expand Down Expand Up @@ -1679,7 +1690,7 @@ struct HfDataCreatorCharmResoReduced {
origin = RecoDecay::getCharmHadronOrigin(mcParticlesPerMcColl, particle, false, &idxBhadMothers);
registry.fill(HIST("hMCGenOrigin"), origin);
auto ptParticle = particle.pt();
auto invMassGen = RecoDecay::m(particle.p(), particle.e());
auto invMassGen = computeInvMassGen(mcParticles, particle.globalIndex());
auto yParticle = RecoDecay::y(particle.pVector(), invMassGen);
auto etaParticle = particle.eta();

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