{"paper":{"title":"Neutrino mass constraints on $\\mu$-decay and $\\pi^0\\to \\nu \\bar{\\nu}$","license":"","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"Andriy Kurylov, Gary Pr\\'ezeau","submitted_at":"2004-09-15T20:16:25Z","abstract_excerpt":"In this letter, we show that upper-limits on neutrino mass translate into upper-limits on the class of neutrino-matter interactions that can generate loop corrections to the neutrino mass matrix. We apply our results to $\\mu$- and $\\pi$-decays and derive model-independent limits on six of the ten parameters used to parametrize contributions to $\\mu$-decay that do not belong to the standard model.\n These upper-limits provide improved constraints on the five Michel parameters,\n $\\rho,\\xi^\\prime,\\xi^{\\prime\\prime},\\alpha,\\alpha^\\prime$, that exceed PDG constraints by at least one order of magnitu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0409193","kind":"arxiv","version":3},"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"}