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[PWGLF] Add twist correction to zdc qvector #18596

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Merged
skundu692 merged 1 commit into from
Nov 4, 2026
Merged

[PWGLF] Add twist correction to zdc qvector #18596

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78 changes: 75 additions & 3 deletions PWGLF/TableProducer/Common/zdc2stagecalibration.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,8 @@ struct zdc2stagecalibration {
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<bool> useQTwist{"useQTwist", false, "apply same-side Qx-Qy twist correction after width equalization"};
Configurable<std::string> confQTwistPath{"confQTwistPath", "", "CCDB path to the run-wise Q-twist map"};
Configurable<int> cfgSpatialCalibBins{
"cfgSpatialCalibBins", 30,
"number of bins per cross coordinate for spatial calibration"};
Expand All @@ -103,6 +105,7 @@ struct zdc2stagecalibration {
TH3D* spatialprofile = nullptr;
TH3D* qRecenteringProfile = nullptr;
TH2D* qWidthProfile = nullptr;
TH2D* qTwistProfile = nullptr;

static constexpr int kQRecenteringNFeatures = 21;
static constexpr int kQRecenteringNMatrixMoments = kQRecenteringNFeatures * (kQRecenteringNFeatures + 1) / 2;
Expand Down Expand Up @@ -137,6 +140,9 @@ struct zdc2stagecalibration {
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");
}
if (useQTwist.value && (!useQWidthEqualization.value || confQTwistPath.value.empty())) {
LOGF(fatal, "Twist correction requires width equalization and confQTwistPath");
}
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 @@ -158,6 +164,7 @@ struct zdc2stagecalibration {
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"};
AxisSpec qTwistMomentAxis = {10, 0.0, 10.0, "Q moments (A: 0-4, C: 5-9)"};
AxisSpec qCorrelationComponentAxis = {4, 0.0, 4.0, "A-C correlation component"};
AxisSpec qValueAxis = {200, -4.0, 4.0, "Q"};

Expand Down Expand Up @@ -261,6 +268,10 @@ struct zdc2stagecalibration {
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("QTwistQA/pMomentsBeforeVsCentrality", "Q moments before twist;centrality (%);moment;<value>", kTProfile2D, {centralityAxis, qTwistMomentAxis});
histos.add("QTwistQA/pMomentsAfterVsCentrality", "Q moments after twist;centrality (%);moment;<value>", kTProfile2D, {centralityAxis, qTwistMomentAxis});
histos.add("PhiQA/hPhiAfterTwistVsCentralityZNA", "ZNA #phi after twist;centrality (%);#phi", kTH2F, {centralityAxis, phiAxis});
histos.add("PhiQA/hPhiAfterTwistVsCentralityZNC", "ZNC #phi after twist;centrality (%);#phi", kTH2F, {centralityAxis, phiAxis});
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});
Expand Down Expand Up @@ -321,6 +332,7 @@ struct zdc2stagecalibration {
spatialprofile = nullptr;
qRecenteringProfile = nullptr;
qWidthProfile = nullptr;
qTwistProfile = nullptr;
if (calibrationStage.value == 2 && useGainCallib.value && !confGainPath.value.empty()) {
gainprofile = ccdb->getForTimeStamp<TH2D>(confGainPath.value, timestamp);
if (!gainprofile) {
Expand Down Expand Up @@ -362,6 +374,18 @@ struct zdc2stagecalibration {
}
}
}
if (calibrationStage.value == 2 && useQTwist.value) {
qTwistProfile = ccdb->getForTimeStamp<TH2D>(confQTwistPath.value, timestamp);
if (!qTwistProfile || qTwistProfile->GetNbinsX() != 80 || qTwistProfile->GetNbinsY() != 6) {
LOGF(fatal, "Missing/invalid ZDC twist map for run %d", runNumber);
}
constexpr std::array<const char*, 6> labels = {"MxxA", "MxyA", "MyyA", "MxxC", "MxyC", "MyyC"};
for (int i = 0; i < 6; ++i) {
if (std::string(qTwistProfile->GetYaxis()->GetBinLabel(i + 1)) != labels[i]) {
LOGF(fatal, "Incorrect ZDC twist map component ordering for run %d", runNumber);
}
}
}
}

float getTimeFromSOR(uint64_t globalBC) const
Expand Down Expand Up @@ -1083,11 +1107,59 @@ struct zdc2stagecalibration {
}
}

const double phiWidthA = std::atan2(qValues[1], qValues[0]);
const double phiWidthC = std::atan2(qValues[3], qValues[2]);
if (useQWidthEqualization.value) {
histos.fill(HIST("PhiQA/hPhiAfterWidthEqVsCentralityZNA"), centrality, phiWidthA);
histos.fill(HIST("PhiQA/hPhiAfterWidthEqVsCentralityZNC"), centrality, phiWidthC);
}
const auto makeTwistMoments = [](const std::array<double, 4>& q) {
return std::array<double, 10>{q[0], q[1], q[0] * q[0], q[1] * q[1], q[0] * q[1],
q[2], q[3], q[2] * q[2], q[3] * q[3], q[2] * q[3]};
};
const auto momentsBeforeTwist = makeTwistMoments(qValues);
if (useQWidthEqualization.value) {
for (int i = 0; i < 10; ++i) {
histos.fill(HIST("QTwistQA/pMomentsBeforeVsCentrality"), centrality, i + 0.5, momentsBeforeTwist[i]);
}
}
if (useQTwist.value) {
const int centBin = qTwistProfile->GetXaxis()->FindFixBin(centrality);
if (centBin < 1 || centBin > qTwistProfile->GetNbinsX()) {
fillTable(false, -999.f, -999.f, -999.f, -999.f);
return;
}
for (int side = 0; side < 2; ++side) {
const int offset = 3 * side;
const double mxx = qTwistProfile->GetBinContent(centBin, offset + 1);
const double mxy = qTwistProfile->GetBinContent(centBin, offset + 2);
const double myy = qTwistProfile->GetBinContent(centBin, offset + 3);
if (!std::isfinite(mxx) || !std::isfinite(mxy) || !std::isfinite(myy) || mxx <= 0.0 || myy <= 0.0 || mxx * myy <= mxy * mxy) {
fillTable(false, -999.f, -999.f, -999.f, -999.f);
return;
}
const int ix = 2 * side;
const double qx = qValues[ix];
const double qy = qValues[ix + 1];
qValues[ix] = mxx * qx + mxy * qy;
qValues[ix + 1] = mxy * qx + myy * qy;
}
for (int i = 0; i < 4; ++i) {
if (!std::isfinite(qValues[i]) || !std::isfinite(static_cast<float>(qValues[i]))) {
fillTable(false, -999.f, -999.f, -999.f, -999.f);
return;
}
}
const auto momentsAfterTwist = makeTwistMoments(qValues);
for (int i = 0; i < 10; ++i) {
histos.fill(HIST("QTwistQA/pMomentsAfterVsCentrality"), centrality, i + 0.5, momentsAfterTwist[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);
if (useQTwist.value) {
histos.fill(HIST("PhiQA/hPhiAfterTwistVsCentralityZNA"), centrality, phiFinalA);
histos.fill(HIST("PhiQA/hPhiAfterTwistVsCentralityZNC"), centrality, phiFinalC);
}
// ZDC resolution after all enabled corrections
const double qMagA = std::hypot(qValues[0], qValues[1]);
Expand Down
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