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[PWGLF] Corrections for systematic uncertainties #16212

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Merged
abmodak merged 3 commits into from
May 12, 2026
+35 −64
Merged

[PWGLF] Corrections for systematic uncertainties #16212

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b1eff01
Corrections for systematic uncertainties
lucasjsilva May 11, 2026
3d3c880
Corrections for systematic uncertainties
lucasjsilva May 12, 2026
6c64926
Fix strange decay counter
lucasjsilva May 12, 2026
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99 changes: 35 additions & 64 deletions PWGLF/Tasks/GlobalEventProperties/studyPnch.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,8 @@
/// \author Abhi Modak (abhi.modak@cern.ch), Lucas José (lucas.jose.franco.da.silva@cern.ch)
/// \since September 10, 2025

#include "PWGLF/DataModel/LFStrangenessTables.h"

#include "Common/CCDB/EventSelectionParams.h"
#include "Common/DataModel/EventSelection.h"
#include "Common/DataModel/McCollisionExtra.h"
Expand All @@ -35,7 +37,6 @@
#include <Framework/runDataProcessing.h>

#include <TH1.h>
#include <TPDGCode.h>

#include <cmath>
#include <cstdint>
Expand Down Expand Up @@ -75,7 +76,7 @@ AxisSpec axisEta{40, -2, 2, "#eta", "EtaAxis"};
AxisSpec axisPhi{629, 0, o2::constants::math::TwoPI, "#phi"};
AxisSpec axisCollSel{5, 0.5, 5.5, "#Event", "CollSelAxis"};
auto static constexpr kMinCharge = 3.f;
auto static constexpr kMinPtCut = 0.1f;
auto static constexpr pTminCut = 0.1f;

struct StudyPnch {

Expand Down Expand Up @@ -110,8 +111,8 @@ struct StudyPnch {
Configurable<bool> isApplyPhiSelection{"isApplyPhiSelection", false, "Select tracks in specific phi range"};
Configurable<float> minPhi{"minPhi", 0.f, "Minimum phi value for track selection"};
Configurable<float> maxPhi{"maxPhi", 6.283185f, "Maximum phi value for track selection"};
Configurable<bool> ispTincrease{"ispTincrease", false, "Varies low pT particles by a conservative amount of +100%"};
Configurable<bool> ispTdecrease{"ispTdecrease", false, "Varies low pT particles by a conservative amount of -50%"};
Configurable<bool> isPtincrease{"isPtincrease", false, "Varies low pT particles by a conservative amount of +100%"};
Configurable<bool> isPtdecrease{"isPtdecrease", false, "Varies low pT particles by a conservative amount of -50%"};
Configurable<bool> isApplyStrangenessSysUncert{"isApplyStrangenessSysUncert", false, "Enable the evaluation of systematics due to strange particle contribution"};

void init(InitContext const&)
Expand All @@ -122,7 +123,6 @@ struct StudyPnch {
AxisSpec axisFt0aMult = {ft0aMultHistBin, "ft0a", "FT0AMultAxis"};
AxisSpec axisFt0cMult = {ft0cMultHistBin, "ft0c", "FT0CMultAxis"};
AxisSpec axisPt = {ptHistBin, "pT", "pTAxis"};
AxisSpec axisCountNumberTracks = {countNumberTracks, "Count", "CountAxis"};
AxisSpec dcaAxis = {binsDCA, "DCA vs PV"};

histos.add("EventHist", "EventHist", kTH1D, {axisEvent}, false);
Expand All @@ -138,13 +138,6 @@ struct StudyPnch {
x->SetBinLabel(6, "INEL > 0");
x->SetBinLabel(7, "|vz| < 10");

histos.add("SelCollsHist", "SelCollsHist", kTH1D, {axisCollSel}, false);
auto hstat_colls = histos.get<TH1>(HIST("SelCollsHist"));
auto* xColls = hstat_colls->GetXaxis();
xColls->SetBinLabel(1, "All collisions");
xColls->SetBinLabel(2, "Best Collision Selection");
xColls->SetBinLabel(3, "Has MC Collision Selection");

if (doprocessData || doprocessCorrelation || doprocessMonteCarlo) {
histos.add("PhiVsEtaHist", "PhiVsEtaHist", kTH2F, {axisPhi, axisEta}, false);
histos.add("EtaHist", "EtaHist", kTH1D, {axisEta}, false);
Expand All @@ -169,17 +162,12 @@ struct StudyPnch {
histos.add("hMultiplicityMCrec", "hMultiplicityMCrec", kTH1F, {axisMult}, true);
histos.add("hMultiplicityMCgen", "hMultiplicityMCgen", kTH1F, {axisMult}, true);
histos.add("hResponseMatrix", "hResponseMatrix", kTH2F, {axisMult, axisMult}, true);
histos.add("hCountNTracks", "hCountNTracks", kTH1F, {axisCountNumberTracks}, true);
}
if (ispTincrease || ispTdecrease) {
histos.add("hMultiplicityMCgenPtCut", "hMultiplicityMCgenPtCut", kTH1F, {axisMult}, true);
histos.add("hResponseMatrixPtCut", "hResponseMatrixPtCut", kTH2F, {axisMult, axisMult}, true);
}
if (isApplyStrangenessSysUncert) {
histos.add("hMultiplicityMCStangeDecay", "hMultiplicityMCStangeDecay", kTH1F, {axisMult}, true);
histos.add("hMultiplicityMCSubtractionSDecay", "hMultiplicityMCSubtractionSDecay", kTH1F, {axisMult}, true);
histos.add("hResponseMatrixStrangeDecay", "hResponseMatrixStrangeDecay", kTH2F, {axisMult, axisMult}, true);
histos.add("hResponseMatrixSubtractionSDecay", "hResponseMatrixSubtractionSDecay", kTH2F, {axisMult, axisMult}, true);
histos.add("hMultiplicityMCSubStrDecay", "hMultiplicityMCSubStrDecay", kTH1F, {axisMult}, true);
histos.add("hResponseMatrixSubStrDecay", "hResponseMatrixSubStrDecay", kTH2F, {axisMult, axisMult}, true);
}
if (doprocessEvtLossSigLossMC) {
histos.add("MCEventHist", "MCEventHist", kTH1F, {axisEvent}, false);
Expand Down Expand Up @@ -339,7 +327,8 @@ struct StudyPnch {
template <typename countTrk, typename McColType>
int countStrangeTracksMcCol(countTrk const& tracks, McColType const& McCol)
{
auto nTrk_strange = 0;
auto nTrkStrange = 0;
auto nTrk = 0;
std::vector<int> mcRecIDs;
for (const auto& track : tracks) {
if (!isTrackSelected(track)) {
Expand All @@ -357,41 +346,34 @@ struct StudyPnch {
if (particle.has_mothers()) {
auto mcMother = particle.template mothers_as<aod::McParticles>().front();
if (mcMother.pdgCode() == PDG_t::kK0Short || std::abs(mcMother.pdgCode()) == PDG_t::kLambda0) {
nTrk_strange++;
nTrkStrange++;
}
}
nTrk++;
}
}
return nTrk_strange;
return nTrk - nTrkStrange;
}

template <typename countTrk, typename McColType>
int countTracksPtCut(countTrk const& tracks, McColType const& McCol)
float countTracksPtCut(countTrk const& tracks, McColType const& McCol)
{
auto nTrk_lowpT = 0;
auto nTrk_highpT = 0;
auto nTrk = 0;
float nTrk = 0.0;
for (const auto& track : tracks) {
if (!isGenTrackSelected(track)) {
continue;
}
if (track.mcCollisionId() != McCol.mcCollisionId()) {
continue;
}
// Evaluate low pT extrapolation
if (track.pt() < kMinPtCut) {
// nTrk_lowpT++;
if (ispTincrease) {
nTrk_lowpT += 2 - 10 * track.pt();
}
if (ispTdecrease) {
nTrk_lowpT += 0.5 + 5 * track.pt();
}
if (track.pt() > pTminCut)
continue;
if (isPtincrease) {
nTrk += 2 - 10 * track.pt();
} else {
nTrk_highpT++;
nTrk += 0.5 + 5 * track.pt();
}
}
nTrk = nTrk_lowpT + nTrk_highpT;
return nTrk;
}

Expand Down Expand Up @@ -426,48 +408,37 @@ struct StudyPnch {
histos.fill(HIST("NPVtracks_vs_GlobalMult"), cols.multNTracksPV(), mult);
}

void processMonteCarlo(soa::Join<aod::McCollisions, aod::McCollsExtra>::iterator const& mcCollision, ColMCRecTable const& RecCols, TrackMCTrueTable const& GenParticles, FilTrackMCRecTable const& RecTracks)
void processMonteCarlo(soa::Join<aod::McCollisions, aod::McCollsExtra, aod::MultMCExtras>::iterator const& mcCollision, ColMCRecTable const& RecCols, TrackMCTrueTable const& GenParticles, FilTrackMCRecTable const& RecTracks)
{
if (isApplyInelgt0 && !mcCollision.isInelGt0()) {
return;
}

for (const auto& RecCol : RecCols) {
if (!isEventSelected(RecCol)) {
continue;
}
histos.fill(HIST("SelCollsHist"), 1);
// Evaluation of reconstructed collisions with more than 1 contributor
if (RecCol.globalIndex() != mcCollision.bestCollisionIndex()) {
continue;
}
histos.fill(HIST("SelCollsHist"), 2);
if (!RecCol.has_mcCollision()) {
continue;
}
histos.fill(HIST("SelCollsHist"), 3);
auto recTracksPart = RecTracks.sliceBy(perCollision, RecCol.globalIndex());
auto multrec = countNTracksMcCol(recTracksPart, RecCol);
if (multrec > 0) {
histos.fill(HIST("hMultiplicityMCrec"), multrec);
}
auto multgen = countGenTracks(GenParticles, RecCol);
if (multgen > 0 && multrec > 0) {
histos.fill(HIST("hMultiplicityMCgen"), multgen);
histos.fill(HIST("hResponseMatrix"), multrec, multgen);
}
if (ispTincrease || ispTdecrease) {
auto nTrkPtCut = countTracksPtCut(GenParticles, RecCol);
if (nTrkPtCut > 0) {
histos.fill(HIST("hMultiplicityMCgenPtCut"), nTrkPtCut);
histos.fill(HIST("hResponseMatrixPtCut"), multrec, nTrkPtCut);
}
}
histos.fill(HIST("hMultiplicityMCrec"), multrec);
float multgen = countGenTracks(GenParticles, RecCol);
histos.fill(HIST("hMultiplicityMCgen"), multgen);
histos.fill(HIST("hResponseMatrix"), multrec, multgen);
float nTrkPtCut = countTracksPtCut(GenParticles, RecCol);
nTrkPtCut = multgen + nTrkPtCut;
histos.fill(HIST("hMultiplicityMCgenPtCut"), nTrkPtCut);
histos.fill(HIST("hResponseMatrixPtCut"), multrec, nTrkPtCut);
if (isApplyStrangenessSysUncert) {
auto nTrk_strange = countStrangeTracksMcCol(recTracksPart, RecCol);
auto nSubtract_strange = multrec - nTrk_strange;
if (multrec > 0) {
histos.fill(HIST("hMultiplicityMCStangeDecay"), nTrk_strange);
histos.fill(HIST("hMultiplicityMCSubtractionSDecay"), nSubtract_strange);
histos.fill(HIST("hResponseMatrixStrangeDecay"), nTrk_strange, multgen);
histos.fill(HIST("hResponseMatrixSubtractionSDecay"), nSubtract_strange, multgen);
}
auto nSubtractStrange = countStrangeTracksMcCol(recTracksPart, RecCol);
histos.fill(HIST("hMultiplicityMCSubStrDecay"), nSubtractStrange);
histos.fill(HIST("hResponseMatrixSubStrDecay"), nSubtractStrange, multgen);
}
}
}
Expand Down
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