{"paper":{"title":"P-odd observables at the $\\Upsilon$ peak","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"2), (2) IFIC, Centre mixte U. de Valencia-CSIC), F.J. Botella (1, J. Bernabeu (1), O. Vives ((1) Dep. Fisica Teorica, U. de Valencia","submitted_at":"1997-11-24T19:03:41Z","abstract_excerpt":"We study the $\\gamma$-Z interference in the process $e^+ e^-\\to \\Upsilon \\to \\tau^+ \\tau^-$ as a means to measure the neutral current coupling of the b-quark. The helicity amplitudes are calculated from resonant and background diagrams and the spin density matrix of the final state is discussed. The spin analyzer of the $\\tau$'s is illustrated with the decays $\\pi \\nu$ and $\\rho \\nu \\to (\\pi \\pi) \\nu$. With $10^8 \\Upsilon$ a sensitivity to $g_V^b$ of a few per cent could be reachable."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9711445","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":""},"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"}