{"paper":{"title":"Observation of quantum entanglement in $\\Lambda \\bar{\\Lambda}$ pair production via electron-positron annihilation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Junle Pei, Tianjun Li, Xiaochuan Wang, Xiqing Hao","submitted_at":"2025-05-15T03:35:10Z","abstract_excerpt":"We report the observation of quantum entanglement in $\\Lambda\\bar{\\Lambda}$ pairs produced via electron-positron annihilation, specifically through the decay $J/\\psi \\to \\Lambda\\bar{\\Lambda}$. By analyzing the angular correlations of the subsequent weak decays $\\Lambda \\to p\\pi^-$ and $\\bar{\\Lambda} \\to \\bar{p}\\pi^+$, we derive normalized observables $\\mathcal{O}_i~(i=0,1,\\ldots,4)$ that distinguish entangled states from separable ones. Theoretical predictions for these observables are established, with violations of separable-state bounds serving as unambiguous signatures of entanglement. Exp"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.09931","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2505.09931/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}