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[PWGLF] Implement competing mass rejection #13976

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Merged
romainschotter merged 3 commits into from
Nov 26, 2025
Merged

[PWGLF] Implement competing mass rejection #13976

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5a153fe
Implement competing mass rejection
romainschotter Nov 25, 2025
abd61c7
Please consider the following formatting changes to #13976 (#13977)
alibuild Nov 25, 2025
553d37f
Update hSelectionV0s with competing mass rejection cuts (for QA)
romainschotter Nov 25, 2025
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21 changes: 21 additions & 0 deletions PWGLF/Tasks/Strangeness/derivedlambdakzeroanalysis.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -55,7 +55,7 @@
#include <Math/Vector4D.h>
#include <TFile.h>
#include <TH2D.h>
#include <TLorentzVector.h>

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[root/lorentz-vector] 

Do not use the TLorentzVector legacy class. Use std::array with RecoDecay methods or the ROOT::Math::LorentzVector template instead.
#include <TPDGCode.h>
#include <TProfile.h>

Expand Down Expand Up @@ -192,6 +192,9 @@
Configurable<float> v0radiusMax{"v0radiusMax", 1E5, "maximum V0 radius (cm)"};
Configurable<LabeledArray<float>> lifetimecut{"lifetimecut", {DefaultLifetimeCuts[0], 2, {"lifetimecutLambda", "lifetimecutK0S"}}, "lifetimecut"};

// invariant mass selection
Configurable<float> compMassRejection{"compMassRejection", -1, "Competing mass rejection (GeV/#it{c}^{2})"};

// Additional selection on the AP plot (exclusive for K0Short)
// original equation: lArmPt*5>TMath::Abs(lArmAlpha)
Configurable<float> armPodCut{"armPodCut", 5.0f, "pT * (cut) > |alpha|, AP cut. Negative: no cut"};
Expand Down Expand Up @@ -374,6 +377,8 @@
selDCAV0Dau,
selK0ShortRapidity,
selLambdaRapidity,
selK0ShortMassRejection,
selLambdaMassRejection,
selTPCPIDPositivePion,
selTPCPIDNegativePion,
selTPCPIDPositiveProton,
Expand Down Expand Up @@ -515,21 +520,21 @@
BITSET(maskTrackProperties, selPosGoodTPCTrack);
BITSET(maskTrackProperties, selPosGoodITSTrack);
// TPC signal is available: ask for positive track PID
if (v0Selections.tpcPidNsigmaCut < 1e+5) { // safeguard for no cut

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
BITSET(maskK0ShortSpecific, selTPCPIDPositivePion);
BITSET(maskLambdaSpecific, selTPCPIDPositiveProton);
BITSET(maskAntiLambdaSpecific, selTPCPIDPositivePion);
}
// TOF PID
if (v0Selections.tofPidNsigmaCutK0Pi < 1e+5) { // safeguard for no cut

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
BITSET(maskK0ShortSpecific, selTOFNSigmaPositivePionK0Short);
BITSET(maskK0ShortSpecific, selTOFDeltaTPositivePionK0Short);
}
if (v0Selections.tofPidNsigmaCutLaPr < 1e+5) { // safeguard for no cut

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
BITSET(maskLambdaSpecific, selTOFNSigmaPositiveProtonLambda);
BITSET(maskLambdaSpecific, selTOFDeltaTPositiveProtonLambda);
}
if (v0Selections.tofPidNsigmaCutLaPi < 1e+5) { // safeguard for no cut

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
BITSET(maskAntiLambdaSpecific, selTOFNSigmaPositivePionLambda);
BITSET(maskAntiLambdaSpecific, selTOFDeltaTPositivePionLambda);
}
Expand All @@ -541,21 +546,21 @@
BITSET(maskTrackProperties, selNegGoodTPCTrack);
BITSET(maskTrackProperties, selNegGoodITSTrack);
// TPC signal is available: ask for negative track PID
if (v0Selections.tpcPidNsigmaCut < 1e+5) { // safeguard for no cut

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
BITSET(maskK0ShortSpecific, selTPCPIDNegativePion);
BITSET(maskLambdaSpecific, selTPCPIDNegativePion);
BITSET(maskAntiLambdaSpecific, selTPCPIDNegativeProton);
}
// TOF PID
if (v0Selections.tofPidNsigmaCutK0Pi < 1e+5) { // safeguard for no cut

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
BITSET(maskK0ShortSpecific, selTOFNSigmaNegativePionK0Short);
BITSET(maskK0ShortSpecific, selTOFDeltaTNegativePionK0Short);
}
if (v0Selections.tofPidNsigmaCutLaPi < 1e+5) { // safeguard for no cut

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
BITSET(maskLambdaSpecific, selTOFNSigmaNegativePionLambda);
BITSET(maskLambdaSpecific, selTOFDeltaTNegativePionLambda);
}
if (v0Selections.tofPidNsigmaCutLaPr < 1e+5) { // safeguard for no cut

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
BITSET(maskAntiLambdaSpecific, selTOFNSigmaNegativeProtonLambda);
BITSET(maskAntiLambdaSpecific, selTOFDeltaTNegativeProtonLambda);
}
Expand All @@ -571,6 +576,12 @@
BITSET(maskAntiLambdaSpecific, selNegNotTPCOnly);
}

if (v0Selections.compMassRejection > -1) {
BITSET(maskK0ShortSpecific, selLambdaMassRejection);
BITSET(maskLambdaSpecific, selK0ShortMassRejection);
BITSET(maskAntiLambdaSpecific, selK0ShortMassRejection);
}

// Primary particle selection, central to analysis
maskSelectionK0Short = maskTopological | maskTrackProperties | maskK0ShortSpecific;
maskSelectionLambda = maskTopological | maskTrackProperties | maskLambdaSpecific;
Expand Down Expand Up @@ -706,7 +717,7 @@
// for QA and test purposes
auto hRawCentrality = histos.add<TH1>("hRawCentrality", "hRawCentrality", kTH1D, {axisConfigurations.axisRawCentrality});

for (int ii = 1; ii < 101; ii++) {

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
float value = 100.5f - static_cast<float>(ii);
hRawCentrality->SetBinContent(ii, value);
}
Expand All @@ -721,6 +732,8 @@
hSelectionV0s->GetXaxis()->SetBinLabel(selDCAV0Dau + 2, "DCA V0 dau.");
hSelectionV0s->GetXaxis()->SetBinLabel(selK0ShortRapidity + 2, "K^{0}_{S} rapidity");
hSelectionV0s->GetXaxis()->SetBinLabel(selLambdaRapidity + 2, "#Lambda rapidity");
hSelectionV0s->GetXaxis()->SetBinLabel(selK0ShortMassRejection + 2, "K^{0}_{S} mass rej.");
hSelectionV0s->GetXaxis()->SetBinLabel(selLambdaMassRejection + 2, "#Lambda mass rej.");
hSelectionV0s->GetXaxis()->SetBinLabel(selTPCPIDPositivePion + 2, "TPC PID #pi^{+}");
hSelectionV0s->GetXaxis()->SetBinLabel(selTPCPIDNegativePion + 2, "TPC PID #pi^{-}");
hSelectionV0s->GetXaxis()->SetBinLabel(selTPCPIDPositiveProton + 2, "TPC PID p");
Expand Down Expand Up @@ -1231,6 +1244,14 @@
if (std::abs(rapidityK0Short) < v0Selections.rapidityCut)
BITSET(bitMap, selK0ShortRapidity);

//
// competing mass rejection
//
if (std::fabs(v0.mK0Short() - o2::constants::physics::MassK0Short) > v0Selections.compMassRejection)
BITSET(bitMap, selK0ShortMassRejection);
if (std::fabs(v0.mLambda() - o2::constants::physics::MassLambda0) > v0Selections.compMassRejection)
BITSET(bitMap, selLambdaMassRejection);

auto posTrackExtra = v0.template posTrackExtra_as<DauTracks>();
auto negTrackExtra = v0.template negTrackExtra_as<DauTracks>();

Expand Down
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