{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"ab253d51b3997bdfe2cfe07cd52ffc946766c102553d5786a930be942cd3f194","created":"2026-10-03T07:18:05Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","80a55df00727257e5ffd06c3456611878d5e3450a708b81f8986a5377faadb26"],"salt":"478ce605ecbba92e64a199d3f11ce6cdbc55ef4fefa87f7e0a88059808ffa0ad","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"hep.baryogenesis.low-scale-leptogenesis","kind":"well-posed","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"80a55df00727257e5ffd06c3456611878d5e3450a708b81f8986a5377faadb26","relation":"special_case"}],"plain":"In one scenario, heavy partners of neutrinos with masses near a few proton masses created the asymmetry. Such particles could be made at accelerators and seen decaying.","posed_since":"1998","precise":"Determine whether heavy neutral leptons N with $M_N \\sim 0.1\\ \\text{to}\\ 100\\ \\mathrm{GeV}$ and active-sterile mixing $U^2$ in the range where resonant or oscillation-based (ARS) leptogenesis gives $\\eta_B \\sim 6e-10$ exist. An answer is a discovery with measured $M_N$, $U_e^2$, $U_{\\mu}^2$, $U_{\\tau}^2$ consistent with that region, or its exclusion.","problem_ref":null,"references":"","settled_by":"Beam-dump and collider searches (SHiP, displaced-vertex searches at LHC, FCC-ee at the Z pole) covering the leptogenesis region.","status_note":"SHiP was approved at CERN in 2024 for operation in the 2030s.","title":"Do GeV-scale heavy neutral leptons realize low-scale 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