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[PWGCF] Added support for 2D acceptance corrections to improve sparse pair co… #17560

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Added support for 2D acceptance corrections to improve sparse pair co…
EmilGorm Aug 21, 2026
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EmilGorm Aug 22, 2026
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78 changes: 53 additions & 25 deletions PWGCF/TwoParticleCorrelations/Tasks/twoParticleCorrelationsMpi.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,7 @@
#include <TDirectory.h>
#include <TFile.h>
#include <TFormula.h>
#include <TH2.h>
#include <TH3.h>
#include <THn.h>
#include <TList.h>
Expand Down Expand Up @@ -238,6 +239,8 @@ struct TwoParticleCorrelationsMpi {

std::vector<YieldTemplate> yieldTemplates;
std::vector<std::unique_ptr<TH3D>> pairAcceptanceMaps;
std::vector<std::unique_ptr<TH2D>> pairAcceptanceEtaVertexMaps;
int pairAcceptanceSchemaVersion = 0;
const TList* loadedCcdbYieldTemplateObject = nullptr;
bool eventSeedEstimatorEnabled = false;

Expand Down Expand Up @@ -726,31 +729,46 @@ struct TwoParticleCorrelationsMpi {
const auto* schemaVersion = dynamic_cast<const TNamed*>(findObject("pairAcceptanceSchemaVersion"));
const auto* normalization = dynamic_cast<const TNamed*>(findObject("pairAcceptanceNormalization"));
const auto* axes = dynamic_cast<const TNamed*>(findObject("pairAcceptanceAxes"));
if (schemaVersion == nullptr || TString(schemaVersion->GetTitle()) != "2" || normalization == nullptr || axes == nullptr) {
LOGF(fatal, "Unsupported or missing multiplicity-only pair-acceptance metadata in %s", source.c_str());
const TString schema = schemaVersion != nullptr ? schemaVersion->GetTitle() : "";
if (schemaVersion == nullptr || (schema != "2" && schema != "3") || normalization == nullptr || axes == nullptr) {
LOGF(fatal, "Unsupported or missing pair-acceptance metadata in %s", source.c_str());
return;
}

const int nMultiplicityBins = AxisSpec(axisMultiplicity).getNbins();
pairAcceptanceMaps.clear();
pairAcceptanceMaps.resize(nMultiplicityBins);
pairAcceptanceEtaVertexMaps.clear();
pairAcceptanceSchemaVersion = schema.Atoi();
int multiplicityDependentOnly = 2;
if (pairAcceptanceSchemaVersion == multiplicityDependentOnly) {
pairAcceptanceMaps.resize(nMultiplicityBins);
} else {
pairAcceptanceEtaVertexMaps.resize(nMultiplicityBins);
}
for (int multBin = 0; multBin < nMultiplicityBins; ++multBin) {
auto* inputMap = dynamic_cast<TH3D*>(findObject(Form("pairAcceptance_mult_%d", multBin)));
if (inputMap == nullptr) {
LOGF(fatal, "Missing pairAcceptance_mult_%d in %s", multBin, source.c_str());
pairAcceptanceMaps.clear();
return;
}
auto* clone = dynamic_cast<TH3D*>(inputMap->Clone(Form("loadedPairAcceptance_mult_%d", multBin)));
if (clone == nullptr) {
LOGF(fatal, "Could not clone pairAcceptance_mult_%d from %s as TH3D", multBin, source.c_str());
pairAcceptanceMaps.clear();
return;
if (pairAcceptanceSchemaVersion == multiplicityDependentOnly) {
auto* inputMap = dynamic_cast<TH3D*>(findObject(Form("pairAcceptance_mult_%d", multBin)));
auto* clone = inputMap != nullptr ? dynamic_cast<TH3D*>(inputMap->Clone(Form("loadedPairAcceptance_mult_%d", multBin))) : nullptr;
if (clone == nullptr) {
LOGF(fatal, "Missing or invalid pairAcceptance_mult_%d in %s", multBin, source.c_str());
pairAcceptanceMaps.clear();
return;
}
clone->SetDirectory(nullptr);
pairAcceptanceMaps[multBin].reset(clone);
} else {
auto* inputMap = dynamic_cast<TH2D*>(findObject(Form("pairAcceptanceEtaVertex_mult_%d", multBin)));
auto* clone = inputMap != nullptr ? dynamic_cast<TH2D*>(inputMap->Clone(Form("loadedPairAcceptanceEtaVertex_mult_%d", multBin))) : nullptr;
if (clone == nullptr) {
LOGF(fatal, "Missing or invalid pairAcceptanceEtaVertex_mult_%d in %s", multBin, source.c_str());
pairAcceptanceEtaVertexMaps.clear();
return;
}
clone->SetDirectory(nullptr);
pairAcceptanceEtaVertexMaps[multBin].reset(clone);
}
clone->SetDirectory(nullptr);
pairAcceptanceMaps[multBin].reset(clone);
}
LOGF(info, "Loaded %zu multiplicity-only pair-acceptance maps from %s", pairAcceptanceMaps.size(), source.c_str());
LOGF(info, "Loaded %d schema-%d pair-acceptance maps from %s", nMultiplicityBins, pairAcceptanceSchemaVersion, source.c_str());
}

void loadLocalYieldTemplates()
Expand Down Expand Up @@ -871,23 +889,33 @@ struct TwoParticleCorrelationsMpi {
}
}

const TH3D* findPairAcceptanceMap(double multiplicity) const
int findPairAcceptanceMultiplicityBin(double multiplicity) const
{
const auto& edges = AxisSpec(axisMultiplicity).binEdges;
const auto upper = std::upper_bound(edges.begin(), edges.end(), multiplicity);
const int multBin = static_cast<int>(std::distance(edges.begin(), upper)) - 1;
if (multBin < 0 || multBin >= static_cast<int>(pairAcceptanceMaps.size())) {
return nullptr;
}
return pairAcceptanceMaps[multBin].get();
return static_cast<int>(std::distance(edges.begin(), upper)) - 1;
}

double getPairAcceptance(double multiplicity, double deltaPhi, double deltaEta, double posZ) const
{
const auto* map = findPairAcceptanceMap(multiplicity);
if (!map) {
const int multBin = findPairAcceptanceMultiplicityBin(multiplicity);
int etaVertexMultiplicityDependentOnly = 3;
if (pairAcceptanceSchemaVersion == etaVertexMultiplicityDependentOnly) {
if (multBin < 0 || multBin >= static_cast<int>(pairAcceptanceEtaVertexMaps.size()) || pairAcceptanceEtaVertexMaps[multBin] == nullptr) {
return 0.0;
}
const auto* map = pairAcceptanceEtaVertexMaps[multBin].get();
const int etaBin = map->GetXaxis()->FindFixBin(deltaEta);
const int vertexBin = map->GetYaxis()->FindFixBin(posZ);
if (etaBin < 1 || etaBin > map->GetNbinsX() || vertexBin < 1 || vertexBin > map->GetNbinsY()) {
return 0.0;
}
return map->GetBinContent(etaBin, vertexBin);
}
if (multBin < 0 || multBin >= static_cast<int>(pairAcceptanceMaps.size()) || pairAcceptanceMaps[multBin] == nullptr) {
return 0.0;
}
const auto* map = pairAcceptanceMaps[multBin].get();
const int phiBin = map->GetXaxis()->FindFixBin(deltaPhi);
const int etaBin = map->GetYaxis()->FindFixBin(deltaEta);
const int vertexBin = map->GetZaxis()->FindFixBin(posZ);
Expand Down
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