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[16.1.X] Adjust TICL v4 track linking to work with (extended) pixel tracks #50967

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Merged
cmsbuild merged 1 commit into from
May 20, 2026
Merged

[16.1.X] Adjust TICL v4 track linking to work with (extended) pixel tracks #50967

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12 changes: 11 additions & 1 deletion RecoHGCal/TICL/plugins/LinkingAlgoByDirectionGeometric.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -303,7 +303,17 @@ void LinkingAlgoByDirectionGeometric::linkTracksters(const edm::Handle<std::vect
continue;

int iSide = int(tk.eta() > 0);
const auto &fts = trajectoryStateTransform::outerFreeState((tk), bFieldProd);
FreeTrajectoryState fts;

// Check whether the outer state is actually valid
if (tk.outerOk()) {
// Use outer state if available
fts = trajectoryStateTransform::outerFreeState(tk, bFieldProd);
} else {
// Fallback: use PCA (reference point)
fts = trajectoryStateTransform::initialFreeState(tk, bFieldProd);
}

// to the HGCal front
const auto &tsos = prop.propagate(fts, firstDisk_[iSide]->surface());
if (tsos.isValid()) {
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