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Store calo SimParticle ancestor chain in SimInfo::ancestorSimIds #366

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Store calo SimParticle ancestor chain in SimInfo::ancestorSimIds #366

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2604754
Store calo SimParticle ancestor chain in SimInfo::ancestorSimIds
zwl0331 May 4, 2026
a26ee41
Populate ancestorSimIds in fillSimInfo for uniform interface
zwl0331 May 7, 2026
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1 change: 1 addition & 0 deletions inc/SimInfo.hh
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Expand Up @@ -29,6 +29,7 @@ namespace mu2e
XYZVectorF endpos = XYZVectorF(); // end position of the SimParticle [mm, in detector coords]
MCRelationship prirel = MCRelationship(); // relationship to the event primary particles
MCRelationship trkrel = MCRelationship(); // relationship to the particle that created hits in the track
std::vector<int> ancestorSimIds; // full parent chain: [parentId, grandparentId, ..., rootId]
void reset() { *this = SimInfo(); }
};
}
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9 changes: 9 additions & 0 deletions src/InfoMCStructHelper.cc
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Expand Up @@ -289,6 +289,15 @@ namespace mu2e {
siminfo.pos = XYZVectorF(det->toDetector(sp.startPosition()));
siminfo.endpos = XYZVectorF(det->toDetector(sp.endPosition()));
siminfo.endmom = XYZVectorF(sp.endMomentum());
// Walk the Geant4 parent chain and store every ancestor's SimParticle id
// (immediate parent first, root last). Populated here so every SimInfo
// collection (trkmcsim, calomcsim, primary list) exposes the same
// ancestorSimIds branch consistently.
auto p = sp.parent();
while (p.isNonnull()) {
siminfo.ancestorSimIds.push_back(p->id().asInt());
p = p->parent();
}
}

void InfoMCStructHelper::fillVDInfo(const KalSeed& kseed, const KalSeedMC& kseedmc, std::vector<std::vector<MCStepInfo>>& all_vdinfos) {
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