{"paper":{"title":"$\\tau^- \\to \\omega \\pi^- \\nu_\\tau$ decay in R$\\chi$T with tensor sources","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"The forward-backward asymmetry in τ to ωπν decay arises only from tensor new physics and provides its clean probe.","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Feng-Zhi Chen, Xin-Qiang Li, Yuan-He Zou","submitted_at":"2026-05-14T00:34:59Z","abstract_excerpt":"We present a study of the $\\tau^- \\to \\omega\\pi^-\\nu_\\tau$ decay in the framework of low-energy effective field theory. By analyzing the $J^{PG}$ quantum numbers of the quark currents and the $\\omega\\pi$ final state, we find that only the Standard Model (SM) vector interaction and the non-standard tensor interaction can contribute to this decay. We construct the resonance chiral theory Lagrangian with external tensor sources and calculate both the vector and tensor form factors, with resonance couplings determined through QCD short-distance constraints, spectral function fitting, and chiral pe"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"the forward-backward asymmetry, which can only arise from a non-zero tensor interaction, provides a sensitive probe of this NP effect","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That resonance couplings fixed by QCD short-distance constraints, spectral function fitting, and chiral perturbation theory matching remain reliable when tensor new physics is added and do not introduce uncontrolled uncertainties in the asymmetry prediction.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"The forward-backward asymmetry in τ⁻ → ω π⁻ ν_τ decay provides a sensitive probe for non-standard tensor interactions in resonance chiral theory.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"The forward-backward asymmetry in τ to ωπν decay arises only from tensor new physics and provides its clean probe.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"bdf0bde06ad4f9e124eff41a7b222ad5fb54cb0a39aac0e97f1a809e8139d7bb"},"source":{"id":"2605.14223","kind":"arxiv","version":1},"verdict":{"id":"01321468-8e64-40dd-9882-0cad601f10bc","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-15T02:40:06.267336Z","strongest_claim":"the forward-backward asymmetry, which can only arise from a non-zero tensor interaction, provides a sensitive probe of this NP effect","one_line_summary":"The forward-backward asymmetry in τ⁻ → ω π⁻ ν_τ decay provides a sensitive probe for non-standard tensor interactions in resonance chiral theory.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That resonance couplings fixed by QCD short-distance constraints, spectral function fitting, and chiral perturbation theory matching remain reliable when tensor new physics is added and do not introduce uncontrolled uncertainties in the asymmetry prediction.","pith_extraction_headline":"The forward-backward asymmetry in τ to ωπν decay arises only from tensor new physics and provides its clean probe."},"references":{"count":37,"sample":[{"doi":"10.1103/physrev.112.1375","year":1958,"title":"S. Weinberg,Phys. Rev.112, 1375 (1958), doi:10.1103/PhysRev.112.1375","work_id":"545ec8c7-60ec-460d-beda-60f6febca7db","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.1016/0370-2693(78","year":1978,"title":"C. Leroy and J. Pestieau,Phys. Lett. B72, 398 (1978), doi:10.1016/0370-2693(78) 90148-X","work_id":"3513ab4f-5a67-42db-82d2-9909f38235f9","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":1987,"title":"E. L. Berger and H. J. Lipkin,Phys. Rev. Lett.59, 1394 (1987), doi:10.1103/ PhysRevLett.59.1394","work_id":"04c253e0-0f36-4682-951b-83c58f8126f3","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.1103/physrevd.110.030001","year":2024,"title":"Review of particle physics","work_id":"6e4dcae4-4b24-43e5-bee3-2fc9806bc8b5","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.1016/j.nuclphysbps.2009.03.021","year":2009,"title":"Search for Second-Class Currents in tau- -> omega.pi-.nu_tau","work_id":"d494f142-4ca5-407c-9fe6-86d0d3d34e4f","ref_index":5,"cited_arxiv_id":"0904.3080","is_internal_anchor":true}],"resolved_work":37,"snapshot_sha256":"b07cd5538bd0aaf2321e781bb56670dcd9d733e442b053ee89f757f64d8dfc99","internal_anchors":14},"formal_canon":{"evidence_count":2,"snapshot_sha256":"ebdbf07d15a1e4de147d32942ce4911d6ffde2e5ab69059affc74b093f51e413"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}