{"paper":{"title":"Probing Quantum Entanglement in $\\tau^+\\tau^-$ Pairs via the $\\pi\\pi$ Channel at STCF","license":"http://creativecommons.org/licenses/by/4.0/","headline":"A Monte Carlo study at the proposed STCF reconstructs concurrence of 0.279 in entangled tau pairs via the pi pi channel.","cross_cats":["hep-ph","quant-ph"],"primary_cat":"hep-ex","authors_text":"Chentao Bao, Dayong Wang, Hai Chen, Mingyi Liu, Xiaokang Li","submitted_at":"2026-05-02T04:10:09Z","abstract_excerpt":"Quantum entanglement and Bell-inequality violation in $\\tau^+\\tau^-$ pairs provide a sensitive probe of quantum correlations in high-energy interactions. We present a feasibility study of $e^+e^- \\to \\tau^+\\tau^-$ at the proposed Super Tau-Charm Facility based on full Monte Carlo simulation at $\\sqrt{s} = 7$ GeV, focusing on the $\\pi\\pi$ channel ($\\tau^\\pm \\to \\pi^\\pm\\nu$), which offers the maximal spin-analyzing power $|\\kappa| = 1$ and the simplest final-state topology for validating the quantum-tomography framework. We establish a consistency chain from the tree-level QED prediction through"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"We establish a consistency chain from the tree-level QED prediction through truth-level and detector-level reconstruction, yielding a reconstructed concurrence of 0.279 ± 0.007 with the good-solution approach.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The Monte Carlo simulation and the good-solution reconstruction method accurately capture detector effects and spin correlations without introducing bias or post-hoc adjustments that would invalidate the reported concurrence value.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Monte Carlo simulation at the proposed STCF reconstructs a concurrence of 0.279 ± 0.007 for tau+ tau- pairs in the pi pi channel, showing feasibility for quantum entanglement studies.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"A Monte Carlo study at the proposed STCF reconstructs concurrence of 0.279 in entangled tau pairs via the pi pi channel.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"14b27e117cb71b2291151cf828896f119bb29f35a252b4319c4652c1735973af"},"source":{"id":"2605.01233","kind":"arxiv","version":2},"verdict":{"id":"824f79b9-78dc-4571-a591-3d4730048df7","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-10T15:10:05.717553Z","strongest_claim":"We establish a consistency chain from the tree-level QED prediction through truth-level and detector-level reconstruction, yielding a reconstructed concurrence of 0.279 ± 0.007 with the good-solution approach.","one_line_summary":"Monte Carlo simulation at the proposed STCF reconstructs a concurrence of 0.279 ± 0.007 for tau+ tau- pairs in the pi pi channel, showing feasibility for quantum entanglement studies.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The Monte Carlo simulation and the good-solution reconstruction method accurately capture detector effects and spin correlations without introducing bias or post-hoc adjustments that would invalidate the reported concurrence value.","pith_extraction_headline":"A Monte Carlo study at the proposed STCF reconstructs concurrence of 0.279 in entangled tau pairs via the pi pi channel."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.01233/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"ai_meta_artifact","ran_at":"2026-05-20T18:36:30.066822Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_compliance","ran_at":"2026-05-19T17:28:55.793545Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"b7ddcadaa1d3c5ca9fd91be92b00ae5463fead24100baad4ca0e57ffdff8f216"},"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"}