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[PWGDQ] correct MFT propagation to vertex in QA tasks #17663

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Merged
mcoquet642 merged 1 commit into from
Aug 31, 2026
Merged

[PWGDQ] correct MFT propagation to vertex in QA tasks #17663

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14 changes: 10 additions & 4 deletions PWGDQ/Tasks/muonGlobalAlignment.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -1465,11 +1465,17 @@ struct muonGlobalAlignment { // o2-linter: disable=name/workflow-file,name/struc
std::sqrt(mftTrackPar.getSigma2X()),
std::sqrt(mftTrackPar.getSigma2Y()));

auto fwdTrackProp = fwdtrackutils::refitGlobalMuonCov(MCHtoFwd(mchTrackAtMFT), mftTrackPar);
auto fwdTrackRefit = fwdtrackutils::refitGlobalMuonCov(MCHtoFwd(mchTrackAtMFT), mftTrackPar);

auto geoMan = o2::base::GeometryManager::meanMaterialBudget(fwdTrackProp.getX(), fwdTrackProp.getY(), fwdTrackProp.getZ(), collision.posX(), collision.posY(), collision.posZ());
auto x2x0 = static_cast<float>(geoMan.meanX2X0);
fwdTrackProp.propagateToVtxhelixWithMCS(collision.posZ(), {collision.posX(), collision.posY()}, {collision.covXX(), collision.covYY()}, mBzAtMftCenter, x2x0);
// apply vertex shift correction
fwdTrackRefit.setZ(fwdTrackRefit.getZ() + cfgVertexZshift.value);

auto fwdTrackProp = fwdtrackutils::propagateTrackParCovFwd(fwdTrackRefit,
0,
collision,
fwdtrackutils::propagationPoint::kToVertex,
cfgRefPlaneZMFT,
mBzAtMftCenter);

return fwdTrackProp;
}
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40 changes: 15 additions & 25 deletions PWGDQ/Tasks/qaMatching.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -1661,31 +1661,18 @@ struct QaMatching {
std::sqrt(collision.covYY()));
}

o2::dataformats::GlobalFwdTrack propagateToVertexMft(o2::dataformats::GlobalFwdTrack muon,
const float vx, const float vy, const float vz,
const float covVx, const float covVy)
{
o2::dataformats::GlobalFwdTrack propmuon;
auto geoMan = o2::base::GeometryManager::meanMaterialBudget(muon.getX(), muon.getY(), muon.getZ(), vx, vy, vz);
auto x2x0 = static_cast<float>(geoMan.meanX2X0);
muon.propagateToVtxhelixWithMCS(vz, {vx, vy}, {covVx, covVy}, mBzAtMftCenter, x2x0);
propmuon.setParameters(muon.getParameters());
propmuon.setZ(muon.getZ());
propmuon.setCovariances(muon.getCovariances());

return propmuon;
}

template <class TMFT, class C>
o2::dataformats::GlobalFwdTrack propagateToVertexMft(const TMFT& muon,
const C& collision)
{
return propagateToVertexMft(fwdToTrackPar(muon),
collision.posX(),
collision.posY(),
collision.posZ(),
std::sqrt(collision.covXX()),
std::sqrt(collision.covYY()));
auto fwdTrackProp = fwdtrackutils::propagateTrackParCovFwd(fwdToTrackPar(muon),
0,
collision,
fwdtrackutils::propagationPoint::kToVertex,
0,
mBzAtMftCenter);

return fwdTrackProp;
}

template <typename TMCH, typename TMFT, class C>
Expand All @@ -1701,11 +1688,14 @@ struct QaMatching {
mftTrack.z(),
0, 0);

auto fwdTrackProp = fwdtrackutils::refitGlobalMuonCov(mExtrap.MCHtoFwd(mchTrackAtMFT), fwdToTrackPar(mftTrack));
auto fwdTrackRefit = fwdtrackutils::refitGlobalMuonCov(mExtrap.MCHtoFwd(mchTrackAtMFT), fwdToTrackPar(mftTrack));

auto geoMan = o2::base::GeometryManager::meanMaterialBudget(fwdTrackProp.getX(), fwdTrackProp.getY(), fwdTrackProp.getZ(), collision.posX(), collision.posY(), collision.posZ());
auto x2x0 = static_cast<float>(geoMan.meanX2X0);
fwdTrackProp.propagateToVtxhelixWithMCS(collision.posZ(), {collision.posX(), collision.posY()}, {collision.covXX(), collision.covYY()}, mBzAtMftCenter, x2x0);
auto fwdTrackProp = fwdtrackutils::propagateTrackParCovFwd(fwdTrackRefit,
0,
collision,
fwdtrackutils::propagationPoint::kToVertex,
0,
mBzAtMftCenter);

return fwdTrackProp;
}
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