{"paper":{"title":"Measurement of the mass of the $\\tau$-lepton and an upper limit on the mass difference between $\\tau^+$ and $\\tau^-$","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"Belle Collaboration","submitted_at":"2005-11-15T07:33:05Z","abstract_excerpt":"The mass of the $\\tau$-lepton has been measured in the decay modes $\\tau \\to 3\\pi \\nu_\\tau$ and $\\tau \\to 3\\pi \\pi^0\\nu_\\tau$ using a pseudomass technique. The preliminary result is $1776.71\\pm 0.25 {(stat)} \\pm 0.62 {(syst)}$ MeV. The preliminary value of an upper limit on the relative mass difference between positive and negative $\\tau$ leptons is $|(M_{\\tau^+}-M_{\\tau^-})|/M_{\\mathrm{average}}$ is $5.0 \\times 10^{-4}$ at 90% CL."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ex/0511038","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"}