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[PWGLF] Fixed mass shift histograms #16775

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Merged
prottayCMT merged 1 commit into from
Jun 23, 2026
+22 −13
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[PWGLF] Fixed mass shift histograms #16775

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35 changes: 22 additions & 13 deletions PWGLF/Tasks/Resonances/kstar892LightIon.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -359,13 +359,12 @@ struct Kstar892LightIon {
if (doprocessRec) {
hMC.add("Rec/hAllRecCollisions", "All reconstructed events", kTH1F, {centralityAxis});
hMC.add("Rec/h1KstarRecMass", "Invariant mass of kstar meson", kTH1F, {invmassAxis});
hMC.add("Rec/h2KstarRecpt1", "pT of kstar meson", kTH3F, {ptAxis, centralityAxis, invmassAxis});
hMC.add("Rec/h2KstarRecpt2", "pT of kstar meson", kTH3F, {ptAxis, centralityAxis, invmassAxis});
hMC.add("Rec/h3KstarRec", "pT of reconstructed kstar meson", kTH3F, {ptAxis, centralityAxis, invmassAxis});
hMC.add("Rec/h3KstarGen", "pT of generated kstar meson", kTH3F, {ptAxis, centralityAxis, invmassAxis});
hMC.add("Rec/h1RecCent", "centrality reconstructed", kTH1F, {centralityAxis});
hMC.add("Rec/h1KSRecsplit", "KS meson Rec split", kTH1F, {{100, 0.0f, 10.0f}});

hMC.add("Rec/hMassShiftGen", "#Delta M = m_{rec} - m_{gen}; #it{p}_{T}_{gen}; #it{p}_{T}_{rec}; #Delta M", kTH3F, {ptAxis, ptAxis, {1000, -0.5, 0.5}});
hMC.add("Rec/hMassShiftPDG", "#Delta M = m_{rec} - m_{PDG}; #it{p}_{T}_{gen}; #it{p}_{T}_{rec}; #Delta M", kTH3F, {ptAxis, ptAxis, {1000, -0.5, 0.5}});
hMC.add("Rec/hMassShift", "#Delta M = m_{rec} - m_{gen}; #it{p}_{T}_{gen}; #it{p}_{T}_{rec}; #Delta M", kTH3F, {ptAxis, ptAxis, {2000, -0.1, 0.1}});
}

// Signal Loss & Event Loss
Expand Down Expand Up @@ -907,8 +906,9 @@ struct Kstar892LightIon {

//*********Varibles declaration***************
float centrality{-1.0}, theta2;
ROOT::Math::PxPyPzMVector daughter1, daughter2, daughterRot, mother, motherRot;
double genMass, recMass, recpt;
ROOT::Math::PxPyPzMVector daughter1, daughter2, daughterRot, genDaughter1, genDaughter2, mother, motherRot, genMother;

double genMass, recMass, recPt, genPt;
bool isMix = false;

template <typename T1, typename T2>
Expand Down Expand Up @@ -1867,29 +1867,38 @@ struct Kstar892LightIon {
if (track1PDG == PDG_t::kPiPlus) {
daughter1 = ROOT::Math::PxPyPzMVector(track1.px(), track1.py(), track1.pz(), massPi);
daughter2 = ROOT::Math::PxPyPzMVector(track2.px(), track2.py(), track2.pz(), massKa);

genDaughter1 = ROOT::Math::PxPyPzMVector(mctrack1.px(), mctrack1.py(), mctrack1.pz(), massPi);
genDaughter2 = ROOT::Math::PxPyPzMVector(mctrack2.px(), mctrack2.py(), mctrack2.pz(), massKa);

} else if (track1PDG == PDG_t::kKPlus) {
daughter1 = ROOT::Math::PxPyPzMVector(track1.px(), track1.py(), track1.pz(), massKa);
daughter2 = ROOT::Math::PxPyPzMVector(track2.px(), track2.py(), track2.pz(), massPi);

genDaughter1 = ROOT::Math::PxPyPzMVector(mctrack1.px(), mctrack1.py(), mctrack1.pz(), massKa);
genDaughter2 = ROOT::Math::PxPyPzMVector(mctrack2.px(), mctrack2.py(), mctrack2.pz(), massPi);
}

mother = daughter1 + daughter2; // Kstar meson
mother = daughter1 + daughter2; // Rec Kstar meson
genMother = genDaughter1 + genDaughter2; // Gen Kstar from MC daughters

if (mother.Rapidity() < selectionConfig.motherRapidityMin || mother.Rapidity() > selectionConfig.motherRapidityMax) {
continue;
}

genMass = std::sqrt(mothertrack1.e() * mothertrack1.e() - mothertrack1.p() * mothertrack1.p());
recMass = mother.M();
recpt = mother.Pt();
recPt = mother.Pt();

genMass = genMother.M();
genPt = mothertrack1.pt();

hMC.fill(HIST("Rec/hMassShiftGen"), mothertrack1.pt(), recpt, recMass - genMass);
hMC.fill(HIST("Rec/hMassShiftPDG"), mothertrack1.pt(), recpt, recMass - 0.8955);
hMC.fill(HIST("Rec/hMassShift"), genPt, recPt, recMass - genMass);

hMC.fill(HIST("Rec/h2KstarRecpt2"), mothertrack1.pt(), centrality, genMass);
hMC.fill(HIST("Rec/h3KstarGen"), genPt, centrality, genMass);

hMC.fill(HIST("Rec/h1KstarRecMass"), recMass);

hMC.fill(HIST("Rec/h2KstarRecpt1"), recpt, centrality, recMass);
hMC.fill(HIST("Rec/h3KstarRec"), recPt, centrality, recMass);
}
}
}
Expand Down
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