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[PWGDQ] add decay length related variables for MCtruth pairs #15634

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573ccd4
add decay length related variables for MCtruth pairs
ffionda Apr 2, 2026
74a1725
Please consider the following formatting changes
alibuild Apr 2, 2026
f40711a
Merge pull request #1 from alibuild/alibot-cleanup-15634
ffionda Apr 2, 2026
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33 changes: 33 additions & 0 deletions PWGDQ/Core/VarManager.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1330,6 +1330,8 @@
static void FillTrackCollision(T const& track, C const& collision, float* values = nullptr);
template <int candidateType, uint32_t fillMap, typename T1, typename T2, typename C>
static void FillTrackCollisionMC(T1 const& track, T2 const& MotherTrack, C const& collision, float* values = nullptr);
template <int candidateType, typename T1>
static void FillTrackCollisionMC(T1 const& track, const std::array<double, 3>& collPos, float massHyp = -1., float* values = nullptr);
template <uint32_t fillMap, typename T, typename C, typename M, typename P>
static void FillTrackCollisionMatCorr(T const& track, C const& collision, M const& materialCorr, P const& propagator, float* values = nullptr);
template <typename U, typename T>
Expand Down Expand Up @@ -1791,9 +1793,9 @@
}
if constexpr ((fillMap & MuonCov) > 0 || (fillMap & ReducedMuonCov) > 0) {
o2::dataformats::GlobalFwdTrack propmuon = PropagateMuon(muontrack, collision);
double px = propmuon.getP() * sin(M_PI / 2 - atan(mfttrack.tgl())) * cos(mfttrack.phi());

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double py = propmuon.getP() * sin(M_PI / 2 - atan(mfttrack.tgl())) * sin(mfttrack.phi());

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double pz = propmuon.getP() * cos(M_PI / 2 - atan(mfttrack.tgl()));

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double pt = std::sqrt(std::pow(px, 2) + std::pow(py, 2));
auto mftprop = o2::aod::fwdtrackutils::getTrackParCovFwdShift(mfttrack, fgzShiftFwd);
values[kX] = mftprop.getX();
Expand Down Expand Up @@ -3301,6 +3303,37 @@
values[kMCVertexingTauxyzProjected] = values[kMCVertexingLxyzProjected] * m / (MotherTrack.p());
}

template <int candidateType, typename T1>
void VarManager::FillTrackCollisionMC(T1 const& track, const std::array<double, 3>& collPos, float massHyp, float* values)
{

if (!values) {
values = fgValues;
}

float m = o2::constants::physics::MassJPsi;
if (massHyp)
m = massHyp;

// displaced vertex is computed with decay product (track) and vertex collPos
values[kMCVertexingLxy] = (collPos[0] - track.vx()) * (collPos[0] - track.vx()) +
(collPos[1] - track.vy()) * (collPos[1] - track.vy());
values[kMCVertexingLz] = (collPos[2] - track.vz()) * (collPos[2] - track.vz());
values[kMCVertexingLxyz] = values[kMCVertexingLxy] + values[kMCVertexingLz];
values[kMCVertexingLxy] = std::sqrt(values[kMCVertexingLxy]);
values[kMCVertexingLz] = std::sqrt(values[kMCVertexingLz]);
values[kMCVertexingLxyz] = std::sqrt(values[kMCVertexingLxyz]);
values[kMCVertexingTauz] = (collPos[2] - track.vz()) * m / (TMath::Abs(track.pz()) * o2::constants::physics::LightSpeedCm2NS);
values[kMCVertexingTauxy] = values[kMCVertexingLxy] * m / (track.pt() * o2::constants::physics::LightSpeedCm2NS);

values[kMCVertexingLzProjected] = ((track.vz() - collPos[2]) * track.pz()) / TMath::Abs(track.pz());
values[kMCVertexingLxyProjected] = (((track.vx() - collPos[0]) * track.px()) + ((track.vy() - collPos[1]) * track.py())) / TMath::Abs(track.pt());
values[kMCVertexingLxyzProjected] = (((track.vx() - collPos[0]) * track.px()) + ((track.vy() - collPos[1]) * track.py()) + ((track.vz() - collPos[2]) * track.pz())) / track.p();
values[kMCVertexingTauxyProjected] = values[kMCVertexingLxyProjected] * m / (track.pt());
values[kMCVertexingTauzProjected] = values[kMCVertexingLzProjected] * m / TMath::Abs(track.pz());
values[kMCVertexingTauxyzProjected] = values[kMCVertexingLxyzProjected] * m / (track.p());
}

template <int pairType, typename T, typename T1>
void VarManager::FillEnergyCorrelatorsMC(T const& track, T1 const& t1, float* values, float Translow, float Transhigh)
{
Expand Down Expand Up @@ -4545,13 +4578,13 @@
values[kVertexingLxyErr] = (KFPV.GetCovariance(0) + KFGeoTwoProng.GetCovariance(0)) * dxPair2PV * dxPair2PV + (KFPV.GetCovariance(2) + KFGeoTwoProng.GetCovariance(2)) * dyPair2PV * dyPair2PV + 2 * ((KFPV.GetCovariance(1) + KFGeoTwoProng.GetCovariance(1)) * dxPair2PV * dyPair2PV);
values[kVertexingLzErr] = (KFPV.GetCovariance(5) + KFGeoTwoProng.GetCovariance(5)) * dzPair2PV * dzPair2PV;
values[kVertexingLxyzErr] = (KFPV.GetCovariance(0) + KFGeoTwoProng.GetCovariance(0)) * dxPair2PV * dxPair2PV + (KFPV.GetCovariance(2) + KFGeoTwoProng.GetCovariance(2)) * dyPair2PV * dyPair2PV + (KFPV.GetCovariance(5) + KFGeoTwoProng.GetCovariance(5)) * dzPair2PV * dzPair2PV + 2 * ((KFPV.GetCovariance(1) + KFGeoTwoProng.GetCovariance(1)) * dxPair2PV * dyPair2PV + (KFPV.GetCovariance(3) + KFGeoTwoProng.GetCovariance(3)) * dxPair2PV * dzPair2PV + (KFPV.GetCovariance(4) + KFGeoTwoProng.GetCovariance(4)) * dyPair2PV * dzPair2PV);
if (fabs(values[kVertexingLxy]) < 1.e-8f)

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values[kVertexingLxy] = 1.e-8f;
values[kVertexingLxyErr] = values[kVertexingLxyErr] < 0. ? 1.e8f : std::sqrt(values[kVertexingLxyErr]) / values[kVertexingLxy];
if (fabs(values[kVertexingLz]) < 1.e-8f)

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values[kVertexingLz] = 1.e-8f;
values[kVertexingLzErr] = values[kVertexingLzErr] < 0. ? 1.e8f : std::sqrt(values[kVertexingLzErr]) / values[kVertexingLz];
if (fabs(values[kVertexingLxyz]) < 1.e-8f)

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values[kVertexingLxyz] = 1.e-8f;
values[kVertexingLxyzErr] = values[kVertexingLxyzErr] < 0. ? 1.e8f : std::sqrt(values[kVertexingLxyzErr]) / values[kVertexingLxyz];
values[kVertexingTauxy] = KFGeoTwoProng.GetPseudoProperDecayTime(KFPV, KFGeoTwoProng.GetMass()) / (o2::constants::physics::LightSpeedCm2NS);
Expand Down Expand Up @@ -4955,13 +4988,13 @@
values[kVertexingLxyErr] = (KFPV.GetCovariance(0) + KFGeoThreeProng.GetCovariance(0)) * dxTriplet2PV * dxTriplet2PV + (KFPV.GetCovariance(2) + KFGeoThreeProng.GetCovariance(2)) * dyTriplet2PV * dyTriplet2PV + 2 * ((KFPV.GetCovariance(1) + KFGeoThreeProng.GetCovariance(1)) * dxTriplet2PV * dyTriplet2PV);
values[kVertexingLzErr] = (KFPV.GetCovariance(5) + KFGeoThreeProng.GetCovariance(5)) * dzTriplet2PV * dzTriplet2PV;
values[kVertexingLxyzErr] = (KFPV.GetCovariance(0) + KFGeoThreeProng.GetCovariance(0)) * dxTriplet2PV * dxTriplet2PV + (KFPV.GetCovariance(2) + KFGeoThreeProng.GetCovariance(2)) * dyTriplet2PV * dyTriplet2PV + (KFPV.GetCovariance(5) + KFGeoThreeProng.GetCovariance(5)) * dzTriplet2PV * dzTriplet2PV + 2 * ((KFPV.GetCovariance(1) + KFGeoThreeProng.GetCovariance(1)) * dxTriplet2PV * dyTriplet2PV + (KFPV.GetCovariance(3) + KFGeoThreeProng.GetCovariance(3)) * dxTriplet2PV * dzTriplet2PV + (KFPV.GetCovariance(4) + KFGeoThreeProng.GetCovariance(4)) * dyTriplet2PV * dzTriplet2PV);
if (fabs(values[kVertexingLxy]) < 1.e-8f)

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values[kVertexingLxy] = 1.e-8f;
values[kVertexingLxyErr] = values[kVertexingLxyErr] < 0. ? 1.e8f : std::sqrt(values[kVertexingLxyErr]) / values[kVertexingLxy];
if (fabs(values[kVertexingLz]) < 1.e-8f)

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values[kVertexingLz] = 1.e-8f;
values[kVertexingLzErr] = values[kVertexingLzErr] < 0. ? 1.e8f : std::sqrt(values[kVertexingLzErr]) / values[kVertexingLz];
if (fabs(values[kVertexingLxyz]) < 1.e-8f)

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values[kVertexingLxyz] = 1.e-8f;
values[kVertexingLxyzErr] = values[kVertexingLxyzErr] < 0. ? 1.e8f : std::sqrt(values[kVertexingLxyzErr]) / values[kVertexingLxyz];

Expand Down Expand Up @@ -5212,7 +5245,7 @@
values[kVertexingLxyErr] = (KFPV.GetCovariance(0) + KFGeoThreeProng.GetCovariance(0)) * dxTriplet3PV * dxTriplet3PV + (KFPV.GetCovariance(2) + KFGeoThreeProng.GetCovariance(2)) * dyTriplet3PV * dyTriplet3PV + 2 * ((KFPV.GetCovariance(1) + KFGeoThreeProng.GetCovariance(1)) * dxTriplet3PV * dyTriplet3PV);
values[kVertexingLzErr] = (KFPV.GetCovariance(5) + KFGeoThreeProng.GetCovariance(5)) * dzTriplet3PV * dzTriplet3PV;
values[kVertexingLxyzErr] = (KFPV.GetCovariance(0) + KFGeoThreeProng.GetCovariance(0)) * dxTriplet3PV * dxTriplet3PV + (KFPV.GetCovariance(2) + KFGeoThreeProng.GetCovariance(2)) * dyTriplet3PV * dyTriplet3PV + (KFPV.GetCovariance(5) + KFGeoThreeProng.GetCovariance(5)) * dzTriplet3PV * dzTriplet3PV + 2 * ((KFPV.GetCovariance(1) + KFGeoThreeProng.GetCovariance(1)) * dxTriplet3PV * dyTriplet3PV + (KFPV.GetCovariance(3) + KFGeoThreeProng.GetCovariance(3)) * dxTriplet3PV * dzTriplet3PV + (KFPV.GetCovariance(4) + KFGeoThreeProng.GetCovariance(4)) * dyTriplet3PV * dzTriplet3PV);
if (fabs(values[kVertexingLxy]) < 1.e-8f)

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values[kVertexingLxy] = 1.e-8f;
values[kVertexingLxyErr] = values[kVertexingLxyErr] < 0. ? 1.e8f : std::sqrt(values[kVertexingLxyErr]) / values[kVertexingLxy];
if (fabs(values[kVertexingLz]) < 1.e-8f)
Expand Down
14 changes: 14 additions & 0 deletions PWGDQ/Tasks/dqEfficiency_withAssoc.cxx
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Expand Up @@ -39,6 +39,7 @@
#include <Framework/BinningPolicy.h>
#include <Framework/Configurable.h>
#include <Framework/InitContext.h>
#include <Framework/O2DatabasePDGPlugin.h>
#include <Framework/runDataProcessing.h>

#include <THashList.h>
Expand Down Expand Up @@ -1397,6 +1398,9 @@ struct AnalysisSameEventPairing {

Service<o2::ccdb::BasicCCDBManager> fCCDB;

// PDG database
Service<o2::framework::O2DatabasePDG> pdgDB;

// Filter filterEventSelected = aod::dqanalysisflags::isEventSelected & uint32_t(1);
Filter eventFilter = aod::dqanalysisflags::isEventSelected > static_cast<uint32_t>(0);

Expand Down Expand Up @@ -2275,6 +2279,16 @@ struct AnalysisSameEventPairing {
// cout << " Signal matched!" << endl;
mcDecision |= (static_cast<uint32_t>(1) << isig);
VarManager::FillPairMC<TPairType>(t1_raw, t2_raw);
// check if t1_raw and t2_raw have same mother to compute decay length related variables
if (t1_raw.has_mothers() && t2_raw.has_mothers()) {
auto motherMCParticle_t1 = t1_raw.template mothers_first_as<ReducedMCTracks>();
auto motherMCParticle_t2 = t2_raw.template mothers_first_as<ReducedMCTracks>();
if (motherMCParticle_t1 == motherMCParticle_t2) {
auto mcEvent = mcEvents.rawIteratorAt(motherMCParticle_t1.reducedMCeventId());
std::array<double, 3> collVtxPos = {mcEvent.mcPosX(), mcEvent.mcPosY(), mcEvent.mcPosZ()};
VarManager::FillTrackCollisionMC<TPairType>(motherMCParticle_t1, collVtxPos, pdgDB->Mass(motherMCParticle_t1.pdgCode()));
}
}
// cout << " Filled VarManager for the pair." << endl;
fHistMan->FillHistClass(Form("MCTruthGenPairSel_%s", sig->GetName()), VarManager::fgValues);
fHistMan->FillHistClass(Form("MCTruthGenPseudoPolPairSel_%s", sig->GetName()), VarManager::fgValues);
Expand Down
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