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[PWGHF] Fix B mass determination in B->JPsi(->µµ)X data creator #15059

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Merged
vkucera merged 2 commits into from
Feb 20, 2026
+9 −8
Merged

[PWGHF] Fix B mass determination in B->JPsi(->µµ)X data creator #15059

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f91985f
Fix B mass determination
fchinu Feb 19, 2026
f97b373
Fix histogram filling
fchinu Feb 19, 2026
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17 changes: 9 additions & 8 deletions PWGHF/D2H/TableProducer/dataCreatorJpsiHadReduced.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -803,8 +803,7 @@ struct HfDataCreatorJpsiHadReduced {

// ---------------------------------
// reconstruct J/Psi candidate secondary vertex
o2::track::TrackParCov const trackParCovJpsi{}; // FIXME: unused
std::array<float, 3> const pVecJpsi{}; // FIXME: unused
std::array<float, 3> pVecJpsi{};
registry.fill(HIST("hFitCandidatesJpsi"), SVFitting::BeforeFit);
try {
if (df2.process(trackPosParCov, trackNegParCov) == 0) {
Expand Down Expand Up @@ -858,12 +857,6 @@ struct HfDataCreatorJpsiHadReduced {

if constexpr (DecChannel == DecayChannel::BplusToJpsiK) {
registry.fill(HIST("hPtKaon"), trackParCovBach.getPt());
// compute invariant mass square and apply selection
invMass2JpsiHad = RecoDecay::m2(std::array{pVecJpsi, pVecBach}, std::array{MassJPsi, MassKPlus});
if ((invMass2JpsiHad < invMass2JpsiHadMin) || (invMass2JpsiHad > invMass2JpsiHadMax)) {
continue;
}
registry.fill(HIST("hMassJpsiKaon"), std::sqrt(invMass2JpsiHad));

registry.fill(HIST("hFitCandidatesBPlus"), SVFitting::BeforeFit);
try {
Expand All @@ -885,12 +878,19 @@ struct HfDataCreatorJpsiHadReduced {
df3.getTrack(1).getPxPyPzGlo(pVec1);
df3.getTrack(2).getPxPyPzGlo(pVec2);
pVecBPlus = RecoDecay::pVec(pVec0, pVec1, pVec2);
pVecJpsi = RecoDecay::pVec(pVec0, pVec1);
trackParCovBPlus = df3.createParentTrackParCov();
trackParCovBPlus.setAbsCharge(0); // to be sure

if (!isBSelected(pVecBPlus, secondaryVertexBPlus, collision)) {
continue;
}
// compute invariant mass square and apply selection
invMass2JpsiHad = RecoDecay::m2(std::array{pVecJpsi, pVecBach}, std::array{MassJPsi, MassKPlus});
if ((invMass2JpsiHad < invMass2JpsiHadMin) || (invMass2JpsiHad > invMass2JpsiHadMax)) {
continue;
}
registry.fill(HIST("hMassJpsiKaon"), std::sqrt(invMass2JpsiHad));

// fill Kaon tracks table
// if information on track already stored, go to next track
Expand Down Expand Up @@ -973,6 +973,7 @@ struct HfDataCreatorJpsiHadReduced {
df4.getTrack(2).getPxPyPzGlo(pVec2);
df4.getTrack(3).getPxPyPzGlo(pVec3);
pVecBS = RecoDecay::pVec(pVec0, pVec1, pVec2, pVec3);
pVecJpsi = RecoDecay::pVec(pVec0, pVec1);
pVecPhi = RecoDecay::pVec(pVec2, pVec3);
trackParCovBS = df4.createParentTrackParCov();
trackParCovBS.setAbsCharge(0); // to be sure
Expand Down
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