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[PWGLF] Apply width correction in ZDC Q vector estimation #18566

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skundu692 merged 1 commit into from
Nov 3, 2026
Merged

[PWGLF] Apply width correction in ZDC Q vector estimation #18566

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96 changes: 77 additions & 19 deletions PWGLF/TableProducer/Common/zdc2stagecalibration.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -82,7 +82,8 @@ struct zdc2stagecalibration {
Configurable<std::string> confQRecenteringPath{"confQRecenteringPath", "", "CCDB path to the current run-wise Q-vector recentering coefficients"};
Configurable<std::string> confQRecenteringMultidimPath{"confQRecenteringMultidimPath", "", "CCDB path to the multidimensional cubic Q-vector recentering coefficients"};
Configurable<std::string> confQRecenteringStructured71Path{"confQRecenteringStructured71Path", "", "CCDB path to the 71-feature structured Q-vector recentering coefficients"};

Configurable<bool> useQWidthEqualization{"useQWidthEqualization", false, "equalize Qx/Qy widths after Structured71 recentering"};
Configurable<std::string> confQWidthPath{"confQWidthPath", "", "CCDB path to post-recentering Q-width map"};
Configurable<int> cfgSpatialCalibBins{
"cfgSpatialCalibBins", 30,
"number of bins per cross coordinate for spatial calibration"};
Expand All @@ -101,6 +102,7 @@ struct zdc2stagecalibration {
TH2D* gainprofile = nullptr;
TH3D* spatialprofile = nullptr;
TH3D* qRecenteringProfile = nullptr;
TH2D* qWidthProfile = nullptr;

static constexpr int kQRecenteringNFeatures = 21;
static constexpr int kQRecenteringNMatrixMoments = kQRecenteringNFeatures * (kQRecenteringNFeatures + 1) / 2;
Expand Down Expand Up @@ -132,7 +134,9 @@ struct zdc2stagecalibration {
if (qRecenteringMethod.value != 0 && qRecenteringMethod.value != 1 && qRecenteringMethod.value != 4) {
LOGF(fatal, "Unsupported qRecenteringMethod=%d. Use 0 for the current regression, 1 for the multidimensional cubic regression or 4 for the structured71 regression.", qRecenteringMethod.value);
}

if (useQWidthEqualization.value && (calibrationStage.value != 2 || !useQRecentering.value || qRecenteringMethod.value != 4 || confQWidthPath.value.empty())) {
LOGF(fatal, "Width equalization requires stage=2, useQRecentering=true, method=4 and confQWidthPath");
}
const int nTimeBins = static_cast<int>(std::ceil(cfgMaxRunHours.value * 60.f / cfgTimeSliceMinutes.value));
AxisSpec timeAxis = {nTimeBins, 0.0, cfgMaxRunHours.value, "time from SOR (h)"};
AxisSpec towerAxis = {4, 0.0, 4.0, "tower"};
Expand All @@ -150,6 +154,7 @@ struct zdc2stagecalibration {
AxisSpec qRecenteringStructuredFlatnessMomentAxis = {kQRecenteringStructuredFlatnessNMoments, 0.0, static_cast<double>(kQRecenteringStructuredFlatnessNMoments), "structured flatness sufficient-statistic index"};
AxisSpec centralityAxis = {80, 0.0, 80.0, "centrality (%)"};
AxisSpec resolutionCentralityAxis = {50, 0.0, 50.0, "centrality (%)"};
AxisSpec resolutionVzAxis = {20, -10.0, 10.0, "v_{z} (cm)"};
AxisSpec vertexXYAxis = {100, -0.1, 0.1, "vertex x/y (cm)"};
AxisSpec vertexZAxis = {100, -10.0, 10.0, "vertex z (cm)"};
AxisSpec qComponentAxis = {4, 0.0, 4.0, "Q component"};
Expand Down Expand Up @@ -254,6 +259,10 @@ struct zdc2stagecalibration {
histos.add("QRecenteringQA/pQAfterVsVy", "Q after recentering vs v_{y};v_{y} (cm);Q component;<Q>", kTProfile2D, {vertexXYAxis, qComponentAxis});
histos.add("QRecenteringQA/pQAfterVsVz", "Q after recentering vs v_{z};v_{z} (cm);Q component;<Q>", kTProfile2D, {vertexZAxis, qComponentAxis});
histos.add("ResolutionQA/pCosPsiAPsiCVsCentrality", "ZDC A-C spectator-plane correlation;centrality (%);<#cos(#Psi_{A}-#Psi_{C})>", kTProfile, {resolutionCentralityAxis});
histos.add("ResolutionQA/pCosPsiAPsiCVsCentralityVz", "ZDC A-C correlation;centrality (%);v_{z} (cm); <#cos(#Psi_{A}-#Psi_{C})>", kTProfile2D, {resolutionCentralityAxis, resolutionVzAxis});
histos.add("QWidthQA/pQAfterWidthEqVsCentrality", "Q after width equalization;centrality (%);Q component;<Q>", kTProfile2D, {centralityAxis, qComponentAxis});
histos.add("PhiQA/hPhiAfterWidthEqVsCentralityZNA", "ZNA #phi after width equalization;centrality (%);#phi", kTH2F, {centralityAxis, phiAxis});
histos.add("PhiQA/hPhiAfterWidthEqVsCentralityZNC", "ZNC #phi after width equalization;centrality (%);#phi", kTH2F, {centralityAxis, phiAxis});
histos.add("QRecentering2DQA/pQxAAfterVsCentralityTime", "QxA after recentering;centrality (%);time from SOR (h);<Q_{x}^{A}>", kTProfile2D, {centralityAxis, timeAxis});
histos.add("QRecentering2DQA/pQyAAfterVsCentralityTime", "QyA after recentering;centrality (%);time from SOR (h);<Q_{y}^{A}>", kTProfile2D, {centralityAxis, timeAxis});
histos.add("QRecentering2DQA/pQxCAfterVsCentralityTime", "QxC after recentering;centrality (%);time from SOR (h);<Q_{x}^{C}>", kTProfile2D, {centralityAxis, timeAxis});
Expand Down Expand Up @@ -311,6 +320,7 @@ struct zdc2stagecalibration {
gainprofile = nullptr;
spatialprofile = nullptr;
qRecenteringProfile = nullptr;
qWidthProfile = nullptr;
if (calibrationStage.value == 2 && useGainCallib.value && !confGainPath.value.empty()) {
gainprofile = ccdb->getForTimeStamp<TH2D>(confGainPath.value, timestamp);
if (!gainprofile) {
Expand Down Expand Up @@ -340,6 +350,18 @@ struct zdc2stagecalibration {
}
}
}
if (calibrationStage.value == 2 && useQWidthEqualization.value) {
qWidthProfile = ccdb->getForTimeStamp<TH2D>(confQWidthPath.value, timestamp);
if (!qWidthProfile || qWidthProfile->GetNbinsX() != 80 || qWidthProfile->GetNbinsY() != 4) {
LOGF(fatal, "Missing/invalid Q-width map for run %d", runNumber);
}
constexpr std::array<const char*, 4> labels = {"QxA", "QyA", "QxC", "QyC"};
for (int i = 0; i < 4; ++i) {
if (std::string(qWidthProfile->GetYaxis()->GetBinLabel(i + 1)) != labels[i]) {
LOGF(fatal, "Incorrect Q-width map component ordering");
}
}
}
}

float getTimeFromSOR(uint64_t globalBC) const
Expand Down Expand Up @@ -468,7 +490,7 @@ struct zdc2stagecalibration {
};

if (!bc.has_zdc()) {
fillTable(false, 0.f, 0.f, 0.f, 0.f);
fillTable(false, -999.f, -999.f, -999.f, -999.f);
return;
}
histos.fill(HIST("hEvtSelInfo"), 1.5);
Expand All @@ -480,7 +502,7 @@ struct zdc2stagecalibration {
const float zncEnergycommon = zdc.energyCommonZNC();

if (!std::isfinite(znaEnergycommon) || !std::isfinite(zncEnergycommon) || znaEnergycommon <= 0.f || zncEnergycommon <= 0.f) {
fillTable(false, 0.f, 0.f, 0.f, 0.f);
fillTable(false, -999.f, -999.f, -999.f, -999.f);
return;
}
histos.fill(HIST("hEvtSelInfo"), 2.5);
Expand All @@ -492,25 +514,25 @@ struct zdc2stagecalibration {
}
}
if (!validTowers) {
fillTable(false, 0.f, 0.f, 0.f, 0.f);
fillTable(false, -999.f, -999.f, -999.f, -999.f);
return;
}
histos.fill(HIST("hEvtSelInfo"), 3.5);

if (rctCut.requireRCTFlagChecker && !rctChecker(collision)) {
fillTable(false, 0.f, 0.f, 0.f, 0.f);
fillTable(false, -999.f, -999.f, -999.f, -999.f);
return;
}
histos.fill(HIST("hEvtSelInfo"), 4.5);

if (!(collision.sel8() && collision.selection_bit(aod::evsel::kIsGoodZvtxFT0vsPV) && std::isfinite(centrality) && centrality > cfgCutCentralityMin && centrality < cfgCutCentralityMax && std::abs(vz) < cfgCutVertex && collision.has_foundFT0())) {
fillTable(false, 0.f, 0.f, 0.f, 0.f);
fillTable(false, -999.f, -999.f, -999.f, -999.f);
return;
}
histos.fill(HIST("hEvtSelInfo"), 5.5);

if (timeFromSOR < 0.f || timeFromSOR >= cfgMaxRunHours.value) {
fillTable(false, 0.f, 0.f, 0.f, 0.f);
fillTable(false, -999.f, -999.f, -999.f, -999.f);
return;
}

Expand Down Expand Up @@ -573,7 +595,7 @@ struct zdc2stagecalibration {
zncCorr[i] = getGain(timeFromSOR, i + 4, gainOK) * zncEnergy[i];
}
if (!gainOK) {
fillTable(false, 0.f, 0.f, 0.f, 0.f);
fillTable(false, -999.f, -999.f, -999.f, -999.f);
return;
}
histos.fill(HIST("hEvtSelInfo"), 6.5);
Expand Down Expand Up @@ -655,7 +677,7 @@ struct zdc2stagecalibration {
}
}
if (!spatialOK) {
fillTable(false, 0.f, 0.f, 0.f, 0.f);
fillTable(false, -999.f, -999.f, -999.f, -999.f);
return;
}

Expand Down Expand Up @@ -746,7 +768,7 @@ struct zdc2stagecalibration {
}

if (sumA <= 1.e-4 || sumC <= 1.e-4) {
fillTable(false, 0.f, 0.f, 0.f, 0.f);
fillTable(false, -999.f, -999.f, -999.f, -999.f);
return;
}

Expand All @@ -766,7 +788,7 @@ struct zdc2stagecalibration {
qyZDCC = cZNC * qyZDCC / sumC;

if (!std::isfinite(qxZDCA) || !std::isfinite(qyZDCA) || !std::isfinite(qxZDCC) || !std::isfinite(qyZDCC)) {
fillTable(false, 0.f, 0.f, 0.f, 0.f);
fillTable(false, -999.f, -999.f, -999.f, -999.f);
return;
}

Expand Down Expand Up @@ -989,7 +1011,7 @@ struct zdc2stagecalibration {
}
}
if (!qRecenteringOK) {
fillTable(false, 0.f, 0.f, 0.f, 0.f);
fillTable(false, -999.f, -999.f, -999.f, -999.f);
return;
}

Expand Down Expand Up @@ -1029,17 +1051,53 @@ struct zdc2stagecalibration {

const double phiRecenteringA = std::atan2(qValues[1], qValues[0]);
const double phiRecenteringC = std::atan2(qValues[3], qValues[2]);
// ZDC resolution
const double qMagA = std::hypot(qValues[0], qValues[1]);
const double qMagC = std::hypot(qValues[2], qValues[3]);
if (centrality >= 0.f && centrality < 50.f && qMagA > 0. && qMagC > 0.) {
histos.fill(HIST("ResolutionQA/pCosPsiAPsiCVsCentrality"), centrality, std::cos(phiRecenteringA - phiRecenteringC));
}
histos.fill(HIST("PhiQA/hPhiAfterRecenteringZNA"), phiRecenteringA);
histos.fill(HIST("PhiQA/hPhiAfterRecenteringZNC"), phiRecenteringC);
histos.fill(HIST("PhiQA/hPhiAfterRecenteringVsCentralityZNA"), centrality, phiRecenteringA);
histos.fill(HIST("PhiQA/hPhiAfterRecenteringVsCentralityZNC"), centrality, phiRecenteringC);

if (useQWidthEqualization.value) {
const int centBin = qWidthProfile->GetXaxis()->FindFixBin(centrality);
if (centBin < 1 || centBin > qWidthProfile->GetNbinsX()) {
LOGF(fatal, "Invalid ZDC Q-width centrality bin for run %d: centrality=%.6f", runNumber, static_cast<double>(centrality));
fillTable(false, -999.f, -999.f, -999.f, -999.f);
return;
}
std::array<double, 4> sigma{};
for (int i = 0; i < 4; ++i) {
sigma[i] = qWidthProfile->GetBinContent(centBin, i + 1);
if (!std::isfinite(sigma[i]) || sigma[i] <= 0.0) {
LOGF(fatal, "Invalid ZDC Q-width sigma for run %d: centrality=%.6f, component=%d, sigma=%.6g", runNumber, static_cast<double>(centrality), i, sigma[i]);
fillTable(false, -999.f, -999.f, -999.f, -999.f);
return;
}
}
const double factorA = std::sqrt(sigma[1] / sigma[0]);
const double factorC = std::sqrt(sigma[3] / sigma[2]);
qValues[0] *= factorA;
qValues[1] /= factorA;
qValues[2] *= factorC;
qValues[3] /= factorC;
for (int i = 0; i < 4; ++i) {
histos.fill(HIST("QWidthQA/pQAfterWidthEqVsCentrality"), centrality, i + 0.5, qValues[i]);
}
}

const double phiFinalA = std::atan2(qValues[1], qValues[0]);
const double phiFinalC = std::atan2(qValues[3], qValues[2]);
if (useQWidthEqualization.value) {
histos.fill(HIST("PhiQA/hPhiAfterWidthEqVsCentralityZNA"), centrality, phiFinalA);
histos.fill(HIST("PhiQA/hPhiAfterWidthEqVsCentralityZNC"), centrality, phiFinalC);
}
// ZDC resolution after all enabled corrections
const double qMagA = std::hypot(qValues[0], qValues[1]);
const double qMagC = std::hypot(qValues[2], qValues[3]);
if (centrality >= 0.f && centrality < 50.f && qMagA > 0. && qMagC > 0.) {
const double correlation = std::cos(phiFinalA - phiFinalC);
histos.fill(HIST("ResolutionQA/pCosPsiAPsiCVsCentrality"), centrality, correlation);
histos.fill(HIST("ResolutionQA/pCosPsiAPsiCVsCentralityVz"), centrality, vz, correlation);
}

histos.fill(HIST("hEvtSelInfo"), 7.5);
fillTable(true, static_cast<float>(qValues[0]), static_cast<float>(qValues[2]), static_cast<float>(qValues[1]), static_cast<float>(qValues[3]));
histos.fill(HIST("hEvtSelInfo"), 8.5);
Expand Down
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