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[PWGCF] FemtoUniverse: KK invariant mass #18417

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zchochul wants to merge 2 commits into from
+38 −28
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[PWGCF] FemtoUniverse: KK invariant mass #18417

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7c322ed
KK inv mass
Oct 22, 2026
f7c09dc
Add Math/Vector4D.h include to femtoUniversePairTaskTrackPhi.cxx
zchochul Oct 22, 2026
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66 changes: 38 additions & 28 deletions PWGCF/FemtoUniverse/Tasks/femtoUniversePairTaskTrackPhi.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,7 @@
#include "PWGCF/FemtoUniverse/Core/FemtoUniverseParticleHisto.h"
#include "PWGCF/FemtoUniverse/Core/FemtoUniverseTrackSelection.h"
#include "PWGCF/FemtoUniverse/DataModel/FemtoDerived.h"
#include "Math/Vector4D.h"

#include <CommonConstants/MathConstants.h>
#include <CommonConstants/PhysicsConstants.h>
Expand Down Expand Up @@ -383,6 +384,7 @@ struct FemtoUniversePairTaskTrackPhi {

registryPhiMinvBackground.add("InvariantMassKpKp", "; invariant mass K+K+; Counts", kTH1F, {{6000, 0.9, 4.0}});
registryPhiMinvBackground.add("InvariantMassKmKm", "; invariant mass K-K-; Counts", kTH1F, {{6000, 0.9, 4.0}});
registryPhiMinvBackground.add("InvariantMassKpKm", "; invariant mass K+K-; Counts", kTH1F, {{6000, 0.9, 4.0}});

qaRegistry.add("Hadron_pos/nSigmaTPCPr", "; #it{p} (GeV/#it{c}); n#sigma_{TPCPr}", kTH2F, {{100, 0, 10}, {200, -4.975, 5.025}});
qaRegistry.add("Hadron_pos/nSigmaTOFPr", "; #it{p} (GeV/#it{c}); n#sigma_{TOFPr}", kTH2F, {{100, 0, 10}, {200, -4.975, 5.025}});
Expand All @@ -405,12 +407,12 @@ struct FemtoUniversePairTaskTrackPhi {
registryMCtruth.add("MCtruthKp", "MC truth K+;#it{p}_{T} (GeV/c); #eta", {HistType::kTH2F, {{500, 0, 5}, {400, -1.0, 1.0}}});
registryMCtruth.add("MCtruthKpPt", "MC truth kaons positive;#it{p}_{T} (GeV/c)", {HistType::kTH1F, {{500, 0, 5}}});
// K-
registryMCtruth.add("MCtruthKm", "MC truth protons;#it{p}_{T} (GeV/c); #eta", {HistType::kTH2F, {{500, 0, 5}, {400, -1.0, 1.0}}});
registryMCtruth.add("MCtruthKm", "MC truth kaons negative;#it{p}_{T} (GeV/c); #eta", {HistType::kTH2F, {{500, 0, 5}, {400, -1.0, 1.0}}});
registryMCtruth.add("MCtruthKmPt", "MC truth kaons negative;#it{p}_{T} (GeV/c)", {HistType::kTH1F, {{500, 0, 5}}});
// p
registryMCtruth.add("MCtruthPpos", "MC truth protons;#it{p}_{T} (GeV/c); #eta", {HistType::kTH2F, {{500, 0, 5}, {400, -1.0, 1.0}}});
registryMCtruth.add("MCtruthPposPt", "MC truth protons;#it{p}_{T} (GeV/c)", {HistType::kTH1F, {{500, 0, 5}}});
// pbar
// p-
registryMCtruth.add("MCtruthPneg", "MC truth antiprotons;#it{p}_{T} (GeV/c); #eta", {HistType::kTH2F, {{500, 0, 5}, {400, -1.0, 1.0}}});
registryMCtruth.add("MCtruthPnegPt", "MC truth antiproton;#it{p}_{T} (GeV/c)", {HistType::kTH1F, {{500, 0, 5}}});
// phi
Expand All @@ -423,7 +425,7 @@ struct FemtoUniversePairTaskTrackPhi {
// p
registryMCreco.add("MCrecoPpos", "MC reco proton;#it{p}_{T} (GeV/c); #eta", {HistType::kTH2F, {{500, 0, 5}, {400, -1.0, 1.0}}});
registryMCreco.add("MCrecoPposPt", "MC reco proton; #it{p_T} (GeV/#it{c}); Counts", kTH1F, {{500, 0, 5}});
// pbar
// p-
registryMCreco.add("MCrecoPneg", "MC reco antiproton;#it{p}_{T} (GeV/c); #eta", {HistType::kTH2F, {{500, 0, 5}, {400, -1.0, 1.0}}});
registryMCreco.add("MCrecoPnegPt", "MC reco antiproton; #it{p_T} (GeV/#it{c}); Counts", kTH1F, {{500, 0, 5}});
// phi
Expand Down Expand Up @@ -549,31 +551,39 @@ struct FemtoUniversePairTaskTrackPhi {
sameEventCont.setPair<isMC>(track, phicandidate, multCol, confUse3D, mWeight);
}

// // Used for better fitting of invariant mass background.

// TLorentzVector part1Vec;
// TLorentzVector part2Vec;

// float mMassOne = o2::constants::physics::MassKPlus;
// float mMassTwo = o2::constants::physics::MassKMinus;

// for (auto const& [kaon1, kaon2] : combinations(CombinationsStrictlyUpperIndexPolicy(groupPartsKaons, groupPartsKaons))) {
// if ((kaon1.mAntiLambda() == 1) && (kaon2.mAntiLambda() == 1)) {
// part1Vec.SetPtEtaPhiM(kaon1.pt(), kaon1.eta(), kaon1.phi(), mMassOne);
// part2Vec.SetPtEtaPhiM(kaon2.pt(), kaon2.eta(), kaon2.phi(), mMassOne);
// TLorentzVector sumVec(part1Vec);
// sumVec += part2Vec;
// registryPhiMinvBackground.fill(HIST("InvariantMassKpKp"), sumVec.M());
// }
// if ((kaon1.mAntiLambda() == -1) && (kaon2.mAntiLambda() == -1)) {
// part1Vec.SetPtEtaPhiM(kaon1.pt(), kaon1.eta(), kaon1.phi(), mMassTwo);
// part2Vec.SetPtEtaPhiM(kaon2.pt(), kaon2.eta(), kaon2.phi(), mMassTwo);

// TLorentzVector sumVec(part1Vec);
// sumVec += part2Vec;
// registryPhiMinvBackground.fill(HIST("InvariantMassKmKm"), sumVec.M());
// }
// }
// Used for better fitting of invariant mass background.

TLorentzVector part1Vec;
TLorentzVector part2Vec;

float mMassOne = o2::constants::physics::MassKPlus;
float mMassTwo = o2::constants::physics::MassKMinus;

for (auto const& [kaon1, kaon2] : combinations(CombinationsStrictlyUpperIndexPolicy(partsKaons, partsKaons))) {
if ((kaon1.mAntiLambda() == 1) && (kaon2.mAntiLambda() == 1)) {
part1Vec.SetPtEtaPhiM(kaon1.pt(), kaon1.eta(), kaon1.phi(), mMassOne);
part2Vec.SetPtEtaPhiM(kaon2.pt(), kaon2.eta(), kaon2.phi(), mMassOne);
TLorentzVector sumVec(part1Vec);
sumVec += part2Vec;
registryPhiMinvBackground.fill(HIST("InvariantMassKpKp"), sumVec.M());
}
if ((kaon1.mAntiLambda() == -1) && (kaon2.mAntiLambda() == -1)) {
part1Vec.SetPtEtaPhiM(kaon1.pt(), kaon1.eta(), kaon1.phi(), mMassTwo);
part2Vec.SetPtEtaPhiM(kaon2.pt(), kaon2.eta(), kaon2.phi(), mMassTwo);

TLorentzVector sumVec(part1Vec);
sumVec += part2Vec;
registryPhiMinvBackground.fill(HIST("InvariantMassKmKm"), sumVec.M());
}
if ((kaon1.mAntiLambda() == 1) && (kaon2.mAntiLambda() == -1)) {
part1Vec.SetPtEtaPhiM(kaon1.pt(), kaon1.eta(), kaon1.phi(), mMassOne);
part2Vec.SetPtEtaPhiM(kaon2.pt(), kaon2.eta(), kaon2.phi(), mMassTwo);

TLorentzVector sumVec(part1Vec);
sumVec += part2Vec;
registryPhiMinvBackground.fill(HIST("InvariantMassKpKm"), sumVec.M());
}
}
}

template <bool isMC, typename PartitionType, typename PartType, typename MCParticles = std::nullptr_t>
Expand Down
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