{"paper":{"title":"Search for $\\psi(4S)\\to\\eta J/\\psi$ in $B^\\pm \\ra \\eta J/\\psi K^\\pm$ and $e^+ e^- \\to \\eta J/\\psi$ processes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"Gao Xu-yang, Shen Cheng-Ping, Wang Xiao-Long","submitted_at":"2015-06-16T13:18:48Z","abstract_excerpt":"We search for the $\\psi(4S)$ state in $B^\\pm \\ra \\eta J/\\psi K^\\pm$ and $e^+e^- \\ra \\eta J/\\psi$ based on the Belle measurements with the assumed mass $M=(4230\\pm8)$ MeV/$c^2$ and width $\\Gamma=(38\\pm12)$ MeV. No significant signal is observed in the $\\eta J/\\psi$ mass spectra. The 90\\% confidence level upper limit on the product branching fraction $\\BR(B^\\pm \\ra \\psi(4S)K^\\pm)\\BR(\\psi(4S) \\ra \\eta J/\\psi)<6.8\\times 10^{-6}$ is obtained in $B^\\pm \\ra \\eta J/\\psi K^\\pm$ decays. By assuming the partial width of $\\psi(4S) \\to e^+e^-$ being 0.63 keV, the branching fraction limit $\\BR(\\psi(4S) \\ra "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1506.04960","kind":"arxiv","version":2},"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"}