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[PWGLF] add competing mass cut for omega's #12339

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Merged
romainschotter merged 2 commits into from
Jul 31, 2025
Merged

[PWGLF] add competing mass cut for omega's #12339

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c3af53b
add competing mass cut for omega's
rspijkers Jul 30, 2025
1d8c43c
fix '>' sign and move to std::abs()
rspijkers Jul 30, 2025
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57 changes: 32 additions & 25 deletions PWGLF/Tasks/Strangeness/cascadecorrelations.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -86,6 +86,7 @@

struct CascadeSelector {
Service<o2::ccdb::BasicCCDBManager> ccdb;
Service<o2::framework::O2DatabasePDG> pdgDB;

Produces<aod::CascadeFlags> cascflags;

Expand All @@ -99,6 +100,8 @@
Configurable<int> INEL{"INEL", 0, "Number of charged tracks within |eta| < 1 has to be greater than value"};
Configurable<double> maxVertexZ{"maxVertexZ", 10., "Maximum value of z coordinate of PV"};
Configurable<float> etaCascades{"etaCascades", 0.8, "min/max of eta for cascades"};
Configurable<bool> doCompetingMassCut{"doCompetingMassCut", true, "Switch to apply a competing mass cut for the Omega's"};
Configurable<float> competingMassWindow{"competingMassWindow", 0.01, "Mass window for the competing mass cut"};

// Tracklevel
Configurable<float> tpcNsigmaBachelor{"tpcNsigmaBachelor", 3, "TPC NSigma bachelor"};
Expand Down Expand Up @@ -302,7 +305,7 @@
if (!gen.isPhysicalPrimary())
return;
int genpdg = gen.pdgCode();
if ((flag < 3 && TMath::Abs(genpdg) == 3312) || (flag > 1 && TMath::Abs(genpdg) == 3334)) {

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// if casc is consistent with Xi and has matched gen Xi OR cand is consistent with Omega and has matched gen omega
// have to do this in case we reco true Xi with only Omega hypothesis (or vice versa) (very unlikely)
registry.fill(HIST("truerec/hV0Radius"), rec.v0radius());
Expand Down Expand Up @@ -413,18 +416,18 @@
casc.v0cosPA(pvx, pvy, pvz) < v0setting_cospa ||
casc.casccosPA(pvx, pvy, pvz) < cascadesetting_cospa ||
casc.dcav0topv(pvx, pvy, pvz) < cascadesetting_mindcav0topv ||
TMath::Abs(casc.mLambda() - 1.115683) > cascadesetting_v0masswindow)

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return 0; // It failed at least one topo selection

registry.fill(HIST("hSelectionStatus"), 4); // passes topo
// registry.fill(HIST("hMassXi3"), casc.mXi(), casc.pt());

if (TMath::Abs(posTrack.eta()) > etaTracks || TMath::Abs(negTrack.eta()) > etaTracks || TMath::Abs(bachTrack.eta()) > etaTracks)

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return 0;

registry.fill(HIST("hSelectionStatus"), 5); // passes track eta

if (TMath::Abs(casc.eta()) > etaCascades)

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return 0;

registry.fill(HIST("hSelectionStatus"), 6); // passes candidate eta
Expand All @@ -435,56 +438,60 @@
// Lambda check
if (casc.sign() < 0) {
// Proton check:
if (TMath::Abs(posTrack.tpcNSigmaPr()) > tpcNsigmaProton)

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return 0;
// Pion check:
if (TMath::Abs(negTrack.tpcNSigmaPi()) > tpcNsigmaPion)

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return 0;
} else {
// Proton check:
if (TMath::Abs(negTrack.tpcNSigmaPr()) > tpcNsigmaProton)

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return 0;
// Pion check:
if (TMath::Abs(posTrack.tpcNSigmaPi()) > tpcNsigmaPion)

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return 0;
}
registry.fill(HIST("hSelectionStatus"), 7); // passes V0 daughters PID
// registry.fill(HIST("hMassXi4"), casc.mXi(), casc.pt());

// Bachelor check
if (TMath::Abs(bachTrack.tpcNSigmaPi()) < tpcNsigmaBachelor) {
if (TMath::Abs(bachTrack.tpcNSigmaKa()) < tpcNsigmaBachelor) {
// consistent with both!
// setting selection flag based on bachelor PID (and competing mass cut for omega's)
int flag = 0;
if (TMath::Abs(bachTrack.tpcNSigmaPi()) < tpcNsigmaBachelor)

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flag = 1;
if (TMath::Abs(bachTrack.tpcNSigmaKa()) < tpcNsigmaBachelor && (!doCompetingMassCut || TMath::Abs(pdgDB->Mass(3312) - casc.mXi()) < competingMassWindow))

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flag = 3 - flag; // 3 if only consistent with omega, 2 if consistent with both

switch (flag) {
case 1: // only Xi
registry.fill(HIST("hSelectionStatus"), 8); // passes bach PID
if (casc.sign() < 0) {
registry.fill(HIST("hMassXiMinus"), casc.mXi(), casc.pt(), casc.yXi());
} else {
registry.fill(HIST("hMassXiPlus"), casc.mXi(), casc.pt(), casc.yXi());
}
break;
case 2: // Xi or Omega
registry.fill(HIST("hSelectionStatus"), 8); // passes bach PID
// registry.fill(HIST("hMassXi5"), casc.mXi(), casc.pt());
if (casc.sign() < 0) {
registry.fill(HIST("hMassXiMinus"), casc.mXi(), casc.pt(), casc.yXi());
registry.fill(HIST("hMassOmegaMinus"), casc.mOmega(), casc.pt(), casc.yOmega());
} else {
registry.fill(HIST("hMassXiPlus"), casc.mXi(), casc.pt(), casc.yXi());
registry.fill(HIST("hMassOmegaPlus"), casc.mOmega(), casc.pt(), casc.yOmega());
}
return 2;
}
registry.fill(HIST("hSelectionStatus"), 8); // passes bach PID
// registry.fill(HIST("hMassXi5"), casc.mXi(), casc.pt());
if (casc.sign() < 0) {
registry.fill(HIST("hMassXiMinus"), casc.mXi(), casc.pt(), casc.yXi());
} else {
registry.fill(HIST("hMassXiPlus"), casc.mXi(), casc.pt(), casc.yXi());
}
return 1;
} else if (TMath::Abs(bachTrack.tpcNSigmaKa()) < tpcNsigmaBachelor) {
registry.fill(HIST("hSelectionStatus"), 8); // passes bach PID
if (casc.sign() < 0) {
registry.fill(HIST("hMassOmegaMinus"), casc.mOmega(), casc.pt(), casc.yOmega());
} else {
registry.fill(HIST("hMassOmegaPlus"), casc.mOmega(), casc.pt(), casc.yOmega());
}
return 3;
break;
case 3: // only Omega
registry.fill(HIST("hSelectionStatus"), 8); // passes bach PID
if (casc.sign() < 0) {
registry.fill(HIST("hMassOmegaMinus"), casc.mOmega(), casc.pt(), casc.yOmega());
} else {
registry.fill(HIST("hMassOmegaPlus"), casc.mOmega(), casc.pt(), casc.yOmega());
}
break;
}
// if we reach here, the bachelor was neither pion nor kaon
return 0;

return flag;

} // processCandidate

void processGenMC(aod::McCollision const&, soa::SmallGroups<soa::Join<aod::McCollisionLabels, MyCollisions>> const& collisions, aod::McParticles const& mcParticles)
Expand Down
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