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[PWGDQ] Track rotation ep preserving #17982

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ayatsujiringo wants to merge 7 commits into from
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[PWGDQ] Track rotation ep preserving #17982

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ec8659b
Add phi-map correction for track rotation
Jul 27, 2026
4b3f0df
edit phi distribution
Jul 27, 2026
c7d5ef1
Add EP-preserving track rotation
Aug 26, 2026
73d4a77
Add EP-preserving track rotation
Aug 26, 2026
e85c101
Add EP-preserving track rotation
Aug 26, 2026
4896ea8
Merge branch 'master' into track-rotation-ep-preserving
ayatsujiringo Aug 26, 2026
99c6855
add MEPM rotated legs
Sep 20, 2026
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67 changes: 64 additions & 3 deletions PWGDQ/Core/VarManager.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1460,7 +1460,9 @@ class VarManager : public TObject
template <int pairType, uint32_t fillMap, typename T1, typename T2>
static void FillPair(T1 const& t1, T2 const& t2, float* values = nullptr);
template <int pairType, uint32_t fillMap, typename T1, typename T2>
static void FillPairRotation(T1 const& t1, T2 const& t2, float* values = nullptr);
static void FillPairRotation(T1 const& t1, T2 const& t2, int rotation, float* values = nullptr);
template <typename T>
static void FillPairRotation_ME(T const& t1, T const& t2, int rotation, float* values = nullptr);
template <int pairType, uint32_t fillMap, typename C, typename T1, typename T2>
static void FillPairCollision(C const& collision, T1 const& t1, T2 const& t2, float* values = nullptr);
template <int pairType, uint32_t fillMap, typename C, typename T1, typename T2, typename M, typename P>
Expand Down Expand Up @@ -4004,7 +4006,7 @@ void VarManager::FillPair(T1 const& t1, T2 const& t2, float* values)

// change_start: rotation pair
template <int pairType, uint32_t fillMap, typename T1, typename T2>
void VarManager::FillPairRotation(T1 const& t1, T2 const& t2, float* values)
void VarManager::FillPairRotation(T1 const& t1, T2 const& t2, int rotation, float* values)
{
if (!values) {
values = fgValues;
Expand Down Expand Up @@ -4034,7 +4036,21 @@ void VarManager::FillPairRotation(T1 const& t1, T2 const& t2, float* values)
m2 = o2::constants::physics::MassMuon;
}

double rotationphi2 = SampleRotationPhi(t2.pt(), t2.eta(), t2.sign());
double rotationphi2 = t2.phi();

if (rotation == 1) {
rotationphi2 = t2.phi() + o2::constants::math::PI;
} else if (rotation == 2) {
rotationphi2 = 2 * values[kPsi2A] - t2.phi();
} else if (rotation == 3) {
rotationphi2 = 2 * values[kPsi2A] - t2.phi() + o2::constants::math::PI;
}

if (rotationphi2 >= o2::constants::math::TwoPI) {
rotationphi2 -= o2::constants::math::TwoPI;
} else if (rotationphi2 < 0) {
rotationphi2 += o2::constants::math::TwoPI;
}

values[kCharge] = t1.sign() + t2.sign();
values[kCharge1] = t1.sign();
Expand Down Expand Up @@ -4497,6 +4513,51 @@ void VarManager::FillPairME(T1 const& t1, T2 const& t2, float* values)
}
}

template <typename T>
void VarManager::FillPairRotation_ME(T const& t1, T const& t2, int rotation, float* values)
{
if (!values) {
values = fgValues;
}

float m1 = o2::constants::physics::MassElectron;
double rotationphi2 = t2.phi;

if (rotation == 1) {
rotationphi2 = t2.phi + o2::constants::math::PI;
} else if (rotation == 2) {
rotationphi2 = 2 * values[kPsi2A] - t2.phi;
} else if (rotation == 3) {
rotationphi2 = 2 * values[kPsi2A] - t2.phi + o2::constants::math::PI;
}

if (rotationphi2 >= o2::constants::math::TwoPI) {
rotationphi2 -= o2::constants::math::TwoPI;
} else if (rotationphi2 < 0) {
rotationphi2 += o2::constants::math::TwoPI;
}

ROOT::Math::PtEtaPhiMVector v1(t1.pt, t1.eta, t1.phi, m1);
ROOT::Math::PtEtaPhiMVector v2(t2.pt, t2.eta, rotationphi2, m1);
ROOT::Math::PtEtaPhiMVector v12 = v1 + v2;
values[kMass] = v12.M();
values[kPt] = v12.Pt();
values[kEta] = v12.Eta();
// values[kPhi] = v12.Phi();
values[kPhi] = RecoDecay::constrainAngle(v12.Phi());
values[kRap] = -v12.Rapidity();
double Ptot1 = TMath::Sqrt(v1.Px() * v1.Px() + v1.Py() * v1.Py() + v1.Pz() * v1.Pz());
double Ptot2 = TMath::Sqrt(v2.Px() * v2.Px() + v2.Py() * v2.Py() + v2.Pz() * v2.Pz());
values[kDeltaPtotTracks] = Ptot1 - Ptot2;

values[kPt1] = t1.pt;
values[kEta1] = t1.eta;
values[kPhi1] = t1.phi;
values[kPt2] = t2.pt;
values[kEta2] = t2.eta;
values[kPhi2] = rotationphi2;
}

template <typename T>
void VarManager::FillPairMEAcrossTFs(T const& t1, T const& t2, float* values)
{
Expand Down
50 changes: 45 additions & 5 deletions PWGDQ/Tasks/tableReader_withAssoc.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -1380,7 +1380,7 @@ struct AnalysisSameEventPairing {

// option for TR pair fill
Configurable<bool> fConfigTRPairs{"cfgFillTRPairs", false, "If true, fill Track rotation pairs"};
Configurable<int> fConfigNRotations{"cfgNRotations", 20, "Number of rotations for track rotation method"};
Configurable<int> fConfigNRotations{"cfgNRotations", 3, "Number of rotations for event plane preserving track rotation method, only 1 or 3 are supported"};

struct : ConfigurableGroup {
Configurable<std::string> url{"ccdb-url", "http://alice-ccdb.cern.ch", "url of the ccdb repository"};
Expand Down Expand Up @@ -1610,13 +1610,14 @@ struct AnalysisSameEventPairing {
if (fConfigTRPairs) {
names.push_back(Form("PairsBarrelTRPM_%s", objArray->At(icut)->GetName()));
names.push_back(Form("PairsBarrelTRPM_ambiguousextra_%s", objArray->At(icut)->GetName()));
histNames += Form("%s;%s;", names[6].Data(), names[7].Data());
names.push_back(Form("PairsBarrelTR_MEPM_%s", objArray->At(icut)->GetName()));
histNames += Form("%s;%s;%s;", names[6].Data(), names[7].Data(), names[8].Data());
}
if (fEnableBarrelMixingHistos) {
names.push_back(Form("PairsBarrelMEPM_%s", objArray->At(icut)->GetName()));
names.push_back(Form("PairsBarrelMEPP_%s", objArray->At(icut)->GetName()));
names.push_back(Form("PairsBarrelMEMM_%s", objArray->At(icut)->GetName()));
histNames += Form("%s;%s;%s;", names[(fConfigTRPairs ? 8 : 6)].Data(), names[(fConfigTRPairs ? 9 : 7)].Data(), names[(fConfigTRPairs ? 10 : 8)].Data());
histNames += Form("%s;%s;%s;", names[(fConfigTRPairs ? 9 : 6)].Data(), names[(fConfigTRPairs ? 10 : 7)].Data(), names[(fConfigTRPairs ? 11 : 8)].Data());
}
fTrackHistNames[icut] = names;

Expand Down Expand Up @@ -2449,14 +2450,26 @@ struct AnalysisSameEventPairing {
}
}
if (sign1 * sign2 < 0) {
for (int i = 0; i < fConfigNRotations.value; i++) {
VarManager::FillPairRotation<TPairType, TTrackFillMap>(t1, t2);
if (fConfigNRotations.value == 1) {
VarManager::FillPairRotation<TPairType, TTrackFillMap>(t1, t2, fConfigNRotations.value);
if constexpr (TPairType == VarManager::kDecayToEE) {
fHistMan->FillHistClass(Form("PairsBarrelTRPM_%s", fTrackCuts[icut].Data()), dqtablereader_helpers::varValues());
if (isAmbiExtra) {
fHistMan->FillHistClass(Form("PairsBarrelTRPM_ambiguousextra_%s", fTrackCuts[icut].Data()), dqtablereader_helpers::varValues());
}
}
} else if (fConfigNRotations.value == 3) {
for (int irot = 1; irot <= fConfigNRotations.value; irot++) {
VarManager::FillPairRotation<TPairType, TTrackFillMap>(t1, t2, irot);
if constexpr (TPairType == VarManager::kDecayToEE) {
fHistMan->FillHistClass(Form("PairsBarrelTRPM_%s", fTrackCuts[icut].Data()), dqtablereader_helpers::varValues());
if (isAmbiExtra) {
fHistMan->FillHistClass(Form("PairsBarrelTRPM_ambiguousextra_%s", fTrackCuts[icut].Data()), dqtablereader_helpers::varValues());
}
}
}
} else {
LOGF(fatal, "Unsupported number of rotations: %d, only 1 and 3 are supported", fConfigNRotations.value);
}
}
}
Expand Down Expand Up @@ -2507,6 +2520,20 @@ struct AnalysisSameEventPairing {
fHistMan->FillHistClass(Form("PairsBarrelMEPM_%s", fTrackCuts[icut].Data()), dqtablereader_helpers::varValues());
}
}
if (fConfigTRPairs) {
// mixing event track should be rotated, so second parameter
if (fConfigNRotations.value != 1 && fConfigNRotations.value != 3) {
LOGF(fatal, "Unsupported number of rotations: %d, only 1 and 3 are supported", fConfigNRotations.value);
}
for (int irot = 1; irot <= fConfigNRotations.value; ++irot) {
VarManager::FillPairRotation_ME(t2, t1, irot);
for (int icut = 0; icut < ncuts; icut++) {
if (mixedTwoTrackFilter & (static_cast<uint32_t>(1) << icut)) {
fHistMan->FillHistClass(Form("PairsBarrelTR_MEPM_%s", fTrackCuts[icut].Data()), dqtablereader_helpers::varValues());
}
}
}
}
}
// run ++ pairing
for (auto const& t2 : poolEvent.tracks1) {
Expand Down Expand Up @@ -2537,6 +2564,19 @@ struct AnalysisSameEventPairing {
fHistMan->FillHistClass(Form("PairsBarrelMEPM_%s", fTrackCuts[icut].Data()), dqtablereader_helpers::varValues());
}
}
if (fConfigTRPairs) {
if (fConfigNRotations.value != 1 && fConfigNRotations.value != 3) {
LOGF(fatal, "Unsupported number of rotations: %d, only 1 and 3 are supported", fConfigNRotations.value);
}
for (int irot = 1; irot <= fConfigNRotations.value; ++irot) {
VarManager::FillPairRotation_ME(t2, t1, irot);
for (int icut = 0; icut < ncuts; icut++) {
if (mixedTwoTrackFilter & (static_cast<uint32_t>(1) << icut)) {
fHistMan->FillHistClass(Form("PairsBarrelTR_MEPM_%s", fTrackCuts[icut].Data()), dqtablereader_helpers::varValues());
}
}
}
}
}
// run -- pairing
for (auto const& t2 : poolEvent.tracks2) {
Expand Down
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