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[PWGUD] add zdc time cut #17259

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[PWGUD] add zdc time cut #17259

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f0e4c8d
add POI
miedema-11 Jul 27, 2026
a2d31fa
add zdc time cut
miedema-11 Jul 30, 2026
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64 changes: 63 additions & 1 deletion PWGUD/Tasks/flowCorrelationsUpc.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -92,6 +92,8 @@ struct FlowCorrelationsUpc {
O2_DEFINE_CONFIGURABLE(cfgRctFlagEnabled, bool, false, "use run condition table flag")
O2_DEFINE_CONFIGURABLE(cfgRctFlagIndex, int, 1, "1: isCBTOk; 2:isCBTZdcOk; 3: isCBTHadronOk; 4:isCBTHadronZdcOk ")
O2_DEFINE_CONFIGURABLE(cfgIRMaxCut, double, 50, "maximum interaction rate for UPC events")
O2_DEFINE_CONFIGURABLE(cfgZdcTime, bool, false, "choose zdc time cut")
O2_DEFINE_CONFIGURABLE(cfgZdcTimeCut, float, 2.0, "zdc time cut")

ConfigurableAxis axisVertex{"axisVertex", {10, -10, 10}, "vertex axis for histograms"};
ConfigurableAxis axisEta{"axisEta", {40, -1., 1.}, "eta axis for histograms"};
Expand Down Expand Up @@ -161,13 +163,16 @@ struct FlowCorrelationsUpc {

registry.add("Trig_hist", "", {HistType::kTHnSparseF, {{axisSample, axisVertex, axisIndependent, axisPtTrigger}}});

registry.add("eventcont", "bin", {HistType::kTH1F, {{10, 0, 10, "bin"}}}); // histogram to see how many events are in the same and mixed event
registry.add("eventcont", "bin", {HistType::kTH1F, {{10, 0, 10, "bin"}}}); // histogram to see how many events are in the same and mixed event
registry.get<TH1>(HIST("eventcont"))->GetXaxis()->SetBinLabel(4, "same");
registry.get<TH1>(HIST("eventcont"))->GetXaxis()->SetBinLabel(5, "mix pair");
registry.add("deltaPhi_deltaEta_same", "deltaphi-deltaeta", {HistType::kTH2D, {axisDeltaPhi, axisDeltaEta}}); // histogram to check the delta eta and delta phi distribution
registry.add("deltaPhi_deltaEta_mixed", "deltaphi-deltaeta", {HistType::kTH2D, {axisDeltaPhi, axisDeltaEta}}); // histogram to check the delta eta and delta phi distribution
registry.add("Nch_raw_vs_independent", "Raw vs Independent", {HistType::kTH2D, {axisMultiplicity, axisIndependent}});
registry.add("interactionRate", "kHz", {HistType::kTH1F, {{50, 0, 50, "kHz"}}});
registry.add("ZDCEnergy", "ZNA; ZNC; Count", {HistType::kTH2D, {{100, 0, 100}, {100, 0, 100}}});
registry.add("ZDCTime", "ZNA; ZNC; Count", {HistType::kTH2D, {{100, -10, 10}, {100, -10, 10}}});
registry.add("neutronClass", "ZNA; ZNC; Count", {HistType::kTH2D, {{2, 0, 2}, {2, 0, 2}}});

if (cfgUseNchRoughMCCorrected) {
fnchRoughMCFunc = new TF1("fnchRoughMCFunc", cfgNchRoughMCFunction->c_str(), 0, 100);
Expand Down Expand Up @@ -226,6 +231,59 @@ struct FlowCorrelationsUpc {
}
}

template <typename C>
// zdc time cut
bool zdcTimeCut(const C& collision)
{
if (!cfgZdcTime) {
return true;
}
int neutronClass = -1;
float energyCommonZNA = collision.energyCommonZNA(), energyCommonZNC = collision.energyCommonZNC();
float timeZNA = collision.timeZNA(), timeZNC = collision.timeZNC();
if (std::isinf(energyCommonZNA))
energyCommonZNA = -999;
if (std::isinf(energyCommonZNC))
energyCommonZNC = -999;
if (std::isinf(timeZNA))
timeZNA = -999;
if (std::isinf(timeZNC))
timeZNC = -999;
registry.fill(HIST("ZDCEnergy"), energyCommonZNC, energyCommonZNA);
registry.fill(HIST("ZDCTime"), timeZNC, timeZNA);
if (std::abs(timeZNA) > cfgZdcTimeCut && std::abs(timeZNC) > cfgZdcTimeCut) {
neutronClass = 0;
registry.fill(HIST("neutronClass"), 0, 0);
}
if (std::abs(timeZNA) <= cfgZdcTimeCut && std::abs(timeZNC) > cfgZdcTimeCut) {
neutronClass = 1;
registry.fill(HIST("neutronClass"), 0, 1);
}
if (std::abs(timeZNA) > cfgZdcTimeCut && std::abs(timeZNC) <= cfgZdcTimeCut) {
neutronClass = 2;
registry.fill(HIST("neutronClass"), 1, 0);
}
if (std::abs(timeZNA) <= cfgZdcTimeCut && std::abs(timeZNC) <= cfgZdcTimeCut) {
neutronClass = 3;
registry.fill(HIST("neutronClass"), 1, 1);
}
if (cfgZdcTime) {
// reject 0n0n and XnXn
if (neutronClass == 0 || neutronClass == 3) { // o2-linter: disable=magic-number (ZDC time cut)
return false;
}
// if A or C gap is requested, keep corresponding neutron class
if (cfgGapSide == 0 || cfgGapSide == 1) {
if ((cfgGapSide == 0 && neutronClass == 1) || (cfgGapSide == 1 && neutronClass == 2)) { // o2-linter: disable=magic-number (ZDC time cut)
// accepted
} else {
return false;
}
}
}
return true;
}

template <typename C>
bool eventSelected(const C& collision)
{
Expand Down Expand Up @@ -257,6 +315,10 @@ struct FlowCorrelationsUpc {
return false;
}

if (!zdcTimeCut(collision)) {
return false;
}

return true;
}

Expand Down
28 changes: 28 additions & 0 deletions PWGUD/Tasks/flowCumulantsUpc.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -341,10 +341,24 @@ struct FlowCumulantsUpc {
fGFW->AddRegion("refP", 0.4, maxEta, 1, 1);
fGFW->AddRegion("refM", -0.4, 0.4, 1, 1);
fGFW->AddRegion("poiN", minEta, -0.4, 1 + fPtAxis->GetNbins(), 2);
fGFW->AddRegion("poiN00", minEta, 0., 1 + fPtAxis->GetNbins(), 2);
fGFW->AddRegion("poiN02", minEta, -0.1, 1 + fPtAxis->GetNbins(), 2);
fGFW->AddRegion("poiN04", minEta, -0.2, 1 + fPtAxis->GetNbins(), 2);
fGFW->AddRegion("poiN06", minEta, -0.3, 1 + fPtAxis->GetNbins(), 2);
fGFW->AddRegion("poiN08", minEta, -0.4, 1 + fPtAxis->GetNbins(), 2);
fGFW->AddRegion("poiN10", minEta, -0.5, 1 + fPtAxis->GetNbins(), 2);
fGFW->AddRegion("poiN12", minEta, -0.6, 1 + fPtAxis->GetNbins(), 2);
fGFW->AddRegion("poiN14", minEta, -0.7, 1 + fPtAxis->GetNbins(), 2);
fGFW->AddRegion("poifull", minEta, maxEta, 1 + fPtAxis->GetNbins(), 2);
fGFW->AddRegion("olN", minEta, -0.4, 1 + fPtAxis->GetNbins(), 4);
fGFW->AddRegion("olN00", minEta, 0., 1 + fPtAxis->GetNbins(), 4);
fGFW->AddRegion("olN02", minEta, -0.1, 1 + fPtAxis->GetNbins(), 4);
fGFW->AddRegion("olN04", minEta, -0.2, 1 + fPtAxis->GetNbins(), 4);
fGFW->AddRegion("olN06", minEta, -0.3, 1 + fPtAxis->GetNbins(), 4);
fGFW->AddRegion("olN08", minEta, -0.4, 1 + fPtAxis->GetNbins(), 4);
fGFW->AddRegion("olN10", minEta, -0.5, 1 + fPtAxis->GetNbins(), 4);
fGFW->AddRegion("olN12", minEta, -0.6, 1 + fPtAxis->GetNbins(), 4);
fGFW->AddRegion("olN14", minEta, -0.7, 1 + fPtAxis->GetNbins(), 4);
fGFW->AddRegion("olfull", minEta, maxEta, 1 + fPtAxis->GetNbins(), 4);

// eta region for MC, can be different from data to study the effect of acceptance
Expand All @@ -369,10 +383,24 @@ struct FlowCumulantsUpc {
fGFWMC->AddRegion("refP", 0.4, maxEta, 1, 1);
fGFWMC->AddRegion("refM", -0.4, 0.4, 1, 1);
fGFWMC->AddRegion("poiN", minEta, -0.4, 1 + fPtAxis->GetNbins(), 2);
fGFWMC->AddRegion("poiN00", minEta, 0., 1 + fPtAxis->GetNbins(), 2);
fGFWMC->AddRegion("poiN02", minEta, -0.1, 1 + fPtAxis->GetNbins(), 2);
fGFWMC->AddRegion("poiN04", minEta, -0.2, 1 + fPtAxis->GetNbins(), 2);
fGFWMC->AddRegion("poiN06", minEta, -0.3, 1 + fPtAxis->GetNbins(), 2);
fGFWMC->AddRegion("poiN08", minEta, -0.4, 1 + fPtAxis->GetNbins(), 2);
fGFWMC->AddRegion("poiN10", minEta, -0.5, 1 + fPtAxis->GetNbins(), 2);
fGFWMC->AddRegion("poiN12", minEta, -0.6, 1 + fPtAxis->GetNbins(), 2);
fGFWMC->AddRegion("poiN14", minEta, -0.7, 1 + fPtAxis->GetNbins(), 2);
fGFWMC->AddRegion("poifull", minEta, maxEta, 1 + fPtAxis->GetNbins(), 2);
fGFWMC->AddRegion("olN", minEta, -0.4, 1 + fPtAxis->GetNbins(), 4);
fGFWMC->AddRegion("olN00", minEta, 0., 1 + fPtAxis->GetNbins(), 4);
fGFWMC->AddRegion("olN02", minEta, -0.1, 1 + fPtAxis->GetNbins(), 4);
fGFWMC->AddRegion("olN04", minEta, -0.2, 1 + fPtAxis->GetNbins(), 4);
fGFWMC->AddRegion("olN06", minEta, -0.3, 1 + fPtAxis->GetNbins(), 4);
fGFWMC->AddRegion("olN08", minEta, -0.4, 1 + fPtAxis->GetNbins(), 4);
fGFWMC->AddRegion("olN10", minEta, -0.5, 1 + fPtAxis->GetNbins(), 4);
fGFWMC->AddRegion("olN12", minEta, -0.6, 1 + fPtAxis->GetNbins(), 4);
fGFWMC->AddRegion("olN14", minEta, -0.7, 1 + fPtAxis->GetNbins(), 4);
fGFWMC->AddRegion("olfull", minEta, maxEta, 1 + fPtAxis->GetNbins(), 4);

corrconfigs.push_back(fGFW->GetCorrelatorConfig("full {2 -2}", "ChFull22", kFALSE));
Expand Down
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