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[PWGLF] Remove jet area cut and use uniform area for UE estimate #16285

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Merged
alcaliva merged 2 commits into from
May 19, 2026
+18 −59
Merged

[PWGLF] Remove jet area cut and use uniform area for UE estimate #16285

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e33c8d8
[PWGLF] Remove jet area cut and use uniform area for UE estimate
alcaliva May 18, 2026
2b17472
restarting the CI
alcaliva May 19, 2026
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77 changes: 18 additions & 59 deletions PWGLF/Tasks/Nuspex/antinucleiInJets.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -132,7 +132,7 @@ struct JetMatching {

struct AntinucleiInJets {

// Random engine
// Random engine (Mersenne Twister)
std::mt19937 rng;
std::uniform_int_distribution<int> generateRandomNr{0, 1};

Expand Down Expand Up @@ -171,8 +171,7 @@ struct AntinucleiInJets {
Configurable<double> ptLeadingMin{"ptLeadingMin", 5.0, "pt Leading Min"};
Configurable<double> rJet{"rJet", 0.4, "Jet resolution parameter R"};
Configurable<double> zVtx{"zVtx", 10.0, "Maximum zVertex"};
Configurable<bool> applyAreaCut{"applyAreaCut", true, "apply area cut"};
Configurable<double> maxNormalizedJetArea{"maxNormalizedJetArea", 1.0, "area cut"};
Configurable<bool> applyAreaCut{"applyAreaCut", false, "apply area cut A > f * pi R^2"};
Configurable<double> deltaEtaEdge{"deltaEtaEdge", 0.05, "eta gap from the edge"};
Configurable<int> nSyst{"nSyst", 50, "number of systematic variations"};
Configurable<int> nSubsamples{"nSubsamples", 50, "number of subsamples"};
Expand Down Expand Up @@ -1296,26 +1295,22 @@ struct AntinucleiInJets {
continue;

// Apply area cut if required
double normalizedJetArea = jet.area() / (PI * rJet * rJet);
if (applyAreaCut && (!isppRefAnalysis) && normalizedJetArea > maxNormalizedJetArea)
continue;
if (isppRefAnalysis && (jet.area() < cfgAreaFrac * PI * rJet * rJet))
if (applyAreaCut && (jet.area() < cfgAreaFrac * PI * rJet * rJet))
continue;
isAtLeastOneJetSelected = true;

// Fill histograms with jet effective area / piR^2 for normalization
registryData.fill(HIST("jetEffectiveAreaOverPiR2"), jet.area() / (PI * rJet * rJet));
registryData.fill(HIST("jetArea"), jet.area());

// Perpendicular cones
double coneRadius = std::sqrt(jet.area() / PI);
TVector3 jetAxis(jet.px(), jet.py(), jet.pz());
TVector3 ueAxis1(0, 0, 0), ueAxis2(0, 0, 0);
getPerpendicularDirections(jetAxis, ueAxis1, ueAxis2);
if (ueAxis1.Mag() == 0 || ueAxis2.Mag() == 0) {
continue;
}

// Fill histogram with jet effective area / piR^2
registryData.fill(HIST("jetEffectiveAreaOverPiR2"), jet.area() / (PI * rJet * rJet));
registryData.fill(HIST("jetArea"), jet.area());

// Get jet constituents
std::vector<fastjet::PseudoJet> jetConstituents = jet.constituents();

Expand Down Expand Up @@ -1427,14 +1422,8 @@ struct AntinucleiInJets {
double deltaPhiUe2 = getDeltaPhi(track.phi(), ueAxis2.Phi());
double deltaRUe2 = std::sqrt(deltaEtaUe2 * deltaEtaUe2 + deltaPhiUe2 * deltaPhiUe2);

// Determine the maximum allowed distance from UE axes for particle selection
double maxConeRadius = coneRadius;
if (applyAreaCut) {
maxConeRadius = std::sqrt(maxNormalizedJetArea) * rJet;
}

// Reject tracks that lie outside the maxConeRadius from both UE axes
if (deltaRUe1 > maxConeRadius && deltaRUe2 > maxConeRadius)
if (deltaRUe1 > rJet && deltaRUe2 > rJet)
continue;

// Define variables
Expand Down Expand Up @@ -1590,8 +1579,7 @@ struct AntinucleiInJets {
continue;

// Apply area cut if required
double normalizedJetArea = jet.area() / (PI * rJet * rJet);
if (applyAreaCut && normalizedJetArea > maxNormalizedJetArea)
if (applyAreaCut && (jet.area() < cfgAreaFrac * PI * rJet * rJet))
continue;
isAtLeastOneJetSelected = true;
}
Expand Down Expand Up @@ -1672,7 +1660,6 @@ struct AntinucleiInJets {
// Jet properties and perpendicular cone
std::vector<fastjet::PseudoJet> jetConstituents = jet.constituents();
TVector3 jetAxis(jet.px(), jet.py(), jet.pz());
double coneRadius = std::sqrt(jet.area() / PI);
TVector3 ueAxis1(0, 0, 0), ueAxis2(0, 0, 0);
getPerpendicularDirections(jetAxis, ueAxis1, ueAxis2);
if (ueAxis1.Mag() == 0 || ueAxis2.Mag() == 0) {
Expand Down Expand Up @@ -1704,7 +1691,7 @@ struct AntinucleiInJets {
double deltaEtaUe2 = track.eta() - ueAxis2.Eta();
double deltaPhiUe2 = getDeltaPhi(track.phi(), ueAxis2.Phi());
double deltaRUe2 = std::sqrt(deltaEtaUe2 * deltaEtaUe2 + deltaPhiUe2 * deltaPhiUe2);
if (deltaRUe1 > coneRadius && deltaRUe2 > coneRadius)
if (deltaRUe1 > rJet && deltaRUe2 > rJet)
continue;

ptPerp = ptPerp + track.pt();
Expand Down Expand Up @@ -2136,10 +2123,7 @@ struct AntinucleiInJets {
continue;

// Apply area cut if required
double normalizedJetArea = jet.area() / (PI * rJet * rJet);
if (applyAreaCut && (!isppRefAnalysis) && normalizedJetArea > maxNormalizedJetArea)
continue;
if (isppRefAnalysis && (jet.area() < cfgAreaFrac * PI * rJet * rJet))
if (applyAreaCut && (jet.area() < cfgAreaFrac * PI * rJet * rJet))
continue;
isAtLeastOneJetSelected = true;

Expand Down Expand Up @@ -2181,7 +2165,6 @@ struct AntinucleiInJets {

// Set up two perpendicular cone axes for underlying event estimation
TVector3 jetAxis(jet.px(), jet.py(), jet.pz());
double coneRadius = std::sqrt(jet.area() / PI);
TVector3 ueAxis1(0, 0, 0), ueAxis2(0, 0, 0);
getPerpendicularDirections(jetAxis, ueAxis1, ueAxis2);
if (ueAxis1.Mag() == 0 || ueAxis2.Mag() == 0) {
Expand All @@ -2199,14 +2182,8 @@ struct AntinucleiInJets {
double deltaPhiUe2 = getDeltaPhi(protonVec.Phi(), ueAxis2.Phi());
double deltaRUe2 = std::sqrt(deltaEtaUe2 * deltaEtaUe2 + deltaPhiUe2 * deltaPhiUe2);

// Determine the maximum allowed distance from UE axes for particle selection
double maxConeRadius = coneRadius;
if (applyAreaCut) {
maxConeRadius = std::sqrt(maxNormalizedJetArea) * rJet;
}

// Reject tracks that lie outside the maxConeRadius from both UE axes
if (deltaRUe1 > maxConeRadius && deltaRUe2 > maxConeRadius)
if (deltaRUe1 > rJet && deltaRUe2 > rJet)
continue;

// Fill normalization histogram
Expand Down Expand Up @@ -2393,18 +2370,14 @@ struct AntinucleiInJets {
continue;

// Apply area cut if required
double normalizedJetArea = jet.area() / (PI * rJet * rJet);
if (applyAreaCut && (!isppRefAnalysis) && normalizedJetArea > maxNormalizedJetArea)
continue;
if (isppRefAnalysis && (jet.area() < cfgAreaFrac * PI * rJet * rJet))
if (applyAreaCut && (jet.area() < cfgAreaFrac * PI * rJet * rJet))
continue;
isAtLeastOneJetSelected = true;

// Reconstructed jets
registryMC.fill(HIST("recJets"), 0.5);

// Set up two perpendicular cone axes for underlying event estimation
double coneRadius = std::sqrt(jet.area() / PI);
TVector3 jetAxis(jet.px(), jet.py(), jet.pz());
TVector3 ueAxis1(0, 0, 0), ueAxis2(0, 0, 0);
getPerpendicularDirections(jetAxis, ueAxis1, ueAxis2);
Expand Down Expand Up @@ -2550,14 +2523,8 @@ struct AntinucleiInJets {
double deltaPhiUe2 = getDeltaPhi(track.phi(), ueAxis2.Phi());
double deltaRUe2 = std::sqrt(deltaEtaUe2 * deltaEtaUe2 + deltaPhiUe2 * deltaPhiUe2);

// Determine the maximum allowed distance from UE axes for particle selection
double maxConeRadius = coneRadius;
if (applyAreaCut) {
maxConeRadius = std::sqrt(maxNormalizedJetArea) * rJet;
}

// Reject tracks that lie outside the maxConeRadius from both UE axes
if (deltaRUe1 > maxConeRadius && deltaRUe2 > maxConeRadius)
if (deltaRUe1 > rJet && deltaRUe2 > rJet)
continue;

// Particle identification using the ITS cluster size
Expand Down Expand Up @@ -3753,8 +3720,7 @@ struct AntinucleiInJets {
continue;

// Apply area cut if required
double normalizedJetArea = jet.area() / (PI * rJet * rJet);
if (applyAreaCut && normalizedJetArea > maxNormalizedJetArea)
if (applyAreaCut && (jet.area() < cfgAreaFrac * PI * rJet * rJet))
continue;
isAtLeastOneJetSelected = true;

Expand All @@ -3769,7 +3735,6 @@ struct AntinucleiInJets {

// Set up two perpendicular cone axes for underlying event estimation
TVector3 jetAxis(jet.px(), jet.py(), jet.pz());
double coneRadius = std::sqrt(jet.area() / PI);
TVector3 ueAxis1(0, 0, 0), ueAxis2(0, 0, 0);
getPerpendicularDirections(jetAxis, ueAxis1, ueAxis2);
if (ueAxis1.Mag() == 0 || ueAxis2.Mag() == 0) {
Expand All @@ -3791,14 +3756,8 @@ struct AntinucleiInJets {
double deltaPhiUe2 = getDeltaPhi(chParticle.phi(), ueAxis2.Phi());
double deltaRUe2 = std::sqrt(deltaEtaUe2 * deltaEtaUe2 + deltaPhiUe2 * deltaPhiUe2);

// Determine the maximum allowed distance from UE axes for particle selection
double maxConeRadius = coneRadius;
if (applyAreaCut) {
maxConeRadius = std::sqrt(maxNormalizedJetArea) * rJet;
}

// Reject tracks that lie outside the maxConeRadius from both UE axes
if (deltaRUe1 > maxConeRadius && deltaRUe2 > maxConeRadius)
if (deltaRUe1 > rJet && deltaRUe2 > rJet)
continue;

// Fill histograms for UE
Expand Down Expand Up @@ -4121,7 +4080,7 @@ struct AntinucleiInJets {
continue;

// Apply area cut if required
if (applyAreaCut && (jetRec.area() / (PI * rJet * rJet)) > maxNormalizedJetArea)
if (applyAreaCut && (jetRec.area() < cfgAreaFrac * PI * rJet * rJet))
continue;

// Clear jet-pair container
Expand All @@ -4134,7 +4093,7 @@ struct AntinucleiInJets {
continue;

// Apply area cut if required
if (applyAreaCut && (jetGen.area() / (PI * rJet * rJet)) > maxNormalizedJetArea)
if (applyAreaCut && (jetGen.area() < cfgAreaFrac * PI * rJet * rJet))
continue;

double deltaEta = jetGen.eta() - jetRec.eta();
Expand Down
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