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Refine particle acceptance criteria for truth seeds #2940

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Refine particle acceptance criteria for truth seeds #2940

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Refine particle acceptance criteria for truth seeds
ShujieL Sep 3, 2026
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[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Sep 3, 2026
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8 changes: 5 additions & 3 deletions src/algorithms/tracking/TrackParamTruthInit.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -39,9 +39,11 @@ void TrackParamTruthInit::process(const Input& input, const Output& output) cons
// Loop over input particles
for (const auto& mcparticle : *mcparticles) {

// accept generator-stable particles (HepMC3/DDSim gun) or Geant4-produced
// secondaries; reject generator intermediates (partons, resonances, beams)
if (!(mcparticle.getGeneratorStatus() == 1 || mcparticle.getSimulatorStatus() != 0)) {
// Accept all generated particles that been transported in simulation.
// Both primary / decayed signal or beam background particles can produce truth seeds.
// SimulatorStatus will stay 0 for intermediate partons, resonances, or any particles
// that are not transported in simulation hence have no chance to leave hits.
if (mcparticle.getSimulatorStatus() == 0) {
trace("ignoring particle with generatorStatus = {}, simulatorStatus = {}",
mcparticle.getGeneratorStatus(), mcparticle.getSimulatorStatus());
continue;
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