{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"49ef89c8e1633f1ee130a481074e43b894b8347a73f99fcd0ed541d697097aa2","created":"2026-10-03T07:18:07Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"9327711fc8c621d6a91885ee5721aa93dd86f6cf8e7226ef722c78f816ab0227","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"nuc.hypernuclei.hypertriton-binding","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"The hypertriton, a $\\Lambda$ hyperon bound to a deuteron, is the lightest hypernucleus and the anchor of fits to hyperon-nucleon forces. Measurements of how strongly the $\\Lambda$ is held differ by a factor of about four.","posed_since":"","precise":"Determine $B_{\\Lambda}(3_{\\Lambda} H)=M(d)+M(\\Lambda)-M(3_{\\Lambda} H)$. Emulsion data give $0.13 \\pm 0.05\\ \\mathrm{MeV}$, STAR gives $0.41 \\pm 0.12\\ (\\mathrm{stat}) \\pm 0.11\\ (\\mathrm{syst})\\ \\mathrm{MeV}$ (Nature Physics 16, 409, 2020), and ALICE gives $0.102 \\pm 0.063\\ (\\mathrm{stat}) \\pm 0.067\\ (\\mathrm{syst})\\ \\mathrm{MeV}$ (PRL 131, 102302, 2023). Answer: $B_{\\Lambda}$ with uncertainty below $20\\ \\mathrm{keV}$ and the resulting constraint on the spin-singlet $\\Lambda N$ interaction and the $\\Lambda NN$ force.","problem_ref":null,"references":"","settled_by":"Decay-pion spectroscopy of $3_{\\Lambda} H$ with absolute mass calibration below 20 keV, cross-checked by high-statistics invariant-mass measurements at the LHC.","status_note":"The 2023 ALICE value, together with its measured lifetime of $253 \\pm 11\\,(\\mathrm{stat}) \\pm 6\\,(\\mathrm{syst})\\,\\mathrm{ps}$ close to the free $\\Lambda$ value, favors weak binding, about 1.7 standard deviations from STAR; STAR deuteron-$\\Lambda$ correlations (arXiv 2511.15493, 2025) opened an independent route.","title":"$\\Lambda$ separation energy of the hypertriton","topic_ref":"b93128f3a78b7cdd64b4bdf89e7fe762d0a049e1f70709bf3ef2e95bbc4cfc00"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"11116239289343e6ca59fc4efe854b8f739430936253dfefa64bcbf05510f9a7","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"1ebabc8edf2bc1cc8e12f1e9b5de374ba0ffe2ead585d5345c6ce58f433dd30b","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"vqFSG0CRfuNVTb3AqSPp9c-khKyaffiALcMZ2Q9WnNqQU_vuDH6vzBehoyv5pYIuifEqcg7qRznqoqP7eR4pDQ"},"schema":"pubphys.envelope/1"},"record_hash":"11116239289343e6ca59fc4efe854b8f739430936253dfefa64bcbf05510f9a7","leaf_index":1764}