{"paper":{"title":"Determination of the Michel Parameters rho, xi, and delta in tau-Lepton Decays with tau --> rho nu Tags","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"ARGUS Collaboration","submitted_at":"1997-11-27T11:44:08Z","abstract_excerpt":"Using the ARGUS detector at the $e^+ e^-$ storage ring DORIS II, we have measured the Michel parameters $\\rho$, $\\xi$, and $\\xi\\delta$ for $\\tau^{\\pm}\\to l^{\\pm} \\nu\\bar\\nu$ decays in $\\tau$-pair events produced at center of mass energies in the region of the $\\Upsilon$ resonances. Using $\\tau^\\mp \\to \\rho^\\mp \\nu$ as spin analyzing tags, we find $\\rho_{e}=0.68\\pm 0.04 \\pm 0.08$, $\\xi_{e}= 1.12 \\pm 0.20 \\pm 0.09$, $\\xi\\delta_{e}= 0.57 \\pm 0.14 \\pm 0.07$, $\\rho_{\\mu}= 0.69 \\pm 0.06 \\pm 0.08$, $\\xi_{\\mu}= 1.25 \\pm 0.27 \\pm 0.14$ and $\\xi\\delta_{\\mu}= 0.72 \\pm 0.18 \\pm 0.10$. In addition, we repo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ex/9711022","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"}