{"paper":{"title":"Search for the Lepton Flavor Violation Processes $J/\\psi \\to$ $\\mu\\tau$ and $e\\tau$","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"BES Collaboration","submitted_at":"2004-06-07T09:50:20Z","abstract_excerpt":"The lepton flavor violation processes $J/\\psi \\to \\mu\\tau$ and $e\\tau$ are searched for using a sample of 5.8$\\times 10^7$ $J/\\psi$ events collected with the BESII detector. Zero and one candidate events, consistent with the estimated background, are observed in $J/\\psi \\to \\mu\\tau, \\tau\\to e\\bar\\nu_e\\nu_{\\tau}$ and $J/\\psi\\to e\\tau, \\tau\\to\\mu\\bar\\nu_{\\mu}\\nu_{\\tau}$ decays, respectively. Upper limits on the branching ratios are determined to be $Br(J/\\psi\\to\\mu\\tau)<2.0 \\times 10^{-6}$ and $Br(J/\\psi \\to e\\tau) < 8.3 \\times10^{-6}$ at the 90% confidence level (C.L.)."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ex/0406018","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"}