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[PWGDQ] Add impact parameter variable (d_0) to pair vertexing #18589

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

[PWGDQ] Add impact parameter variable (d_0) to pair vertexing #18589

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3 changes: 3 additions & 0 deletions PWGDQ/Core/VarManager.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -1365,6 +1365,8 @@ void VarManager::SetDefaultVarNames()
fgVariableUnits[kMCVertexingTauxyzProjected] = "ns";
fgVariableNames[kCosPointingAngle] = "cos(#theta_{pointing})";
fgVariableUnits[kCosPointingAngle] = "";
fgVariableNames[kVertexingImpactParameter] = "d_{0}";
fgVariableUnits[kVertexingImpactParameter] = "cm";
fgVariableNames[kMCCosPointingAngle] = "MC cos(#theta_{pointing})";
fgVariableUnits[kMCCosPointingAngle] = "";
fgVariableNames[kD0DcaDaughters] = "DCA of D0 daughters";
Expand Down Expand Up @@ -2687,6 +2689,7 @@ void VarManager::SetDefaultVarNames()
fgVarNamesMap["kQuadDCAsigXYZ"] = kQuadDCAsigXYZ;
fgVarNamesMap["kSignQuadDCAsigXY"] = kSignQuadDCAsigXY;
fgVarNamesMap["kCosPointingAngle"] = kCosPointingAngle;
fgVarNamesMap["kVertexingImpactParameter"] = kVertexingImpactParameter;
fgVarNamesMap["kMCCosPointingAngle"] = kMCCosPointingAngle;
fgVarNamesMap["kD0ImpParProduct"] = kD0ImpParProduct;
fgVarNamesMap["kD0DcaDaughters"] = kD0DcaDaughters;
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3 changes: 3 additions & 0 deletions PWGDQ/Core/VarManager.h
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Original file line number Diff line number Diff line change
Expand Up @@ -892,6 +892,7 @@ class VarManager : public TObject
kQuadDCAsigXYZ,
kSignQuadDCAsigXY,
kCosPointingAngle,
kVertexingImpactParameter,
kD0ImpParProduct,
kD0DcaDaughters,
kImpParXYJpsi,
Expand Down Expand Up @@ -5318,6 +5319,7 @@ void VarManager::FillPairVertexing(C const& collision, T const& t1, T const& t2,

values[kCosPointingAngle] = (dx * v12.Px() + dy * v12.Py() + dz * v12.Pz()) /
(v12.P() * values[VarManager::kVertexingLxyz]);
values[kVertexingImpactParameter] = values[VarManager::kVertexingLxyz] * std::sqrt(1 - values[VarManager::kCosPointingAngle] * values[VarManager::kCosPointingAngle]);
// Decay length defined as in Run 2
values[kVertexingLzProjected] = (dz * v12.Pz()) / TMath::Sqrt(v12.Pz() * v12.Pz());
values[kVertexingLxyProjected] = (dx * v12.Px()) + (dy * v12.Py());
Expand Down Expand Up @@ -5398,6 +5400,7 @@ void VarManager::FillPairVertexing(C const& collision, T const& t1, T const& t2,
std::sqrt(dyPair2PV * dyPair2PV) * v12.Py() +
std::sqrt(dzPair2PV * dzPair2PV) * v12.Pz()) /
(v12.P() * values[VarManager::kVertexingLxyz]);
values[kVertexingImpactParameter] = values[VarManager::kVertexingLxyz] * std::sqrt(1 - values[VarManager::kCosPointingAngle] * values[VarManager::kCosPointingAngle]);
}
// As defined in Run 2 (projected onto momentum)
if (fgUsedVars[kVertexingLxyProjected] || fgUsedVars[kVertexingLxyzProjected] || fgUsedVars[kVertexingLzProjected]) {
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