{"paper":{"title":"The $\\eta - \\eta'$ Mixing Angle Revisited","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"A. Bramon, M. D. Scadron, R. Escribano","submitted_at":"1997-11-04T15:08:19Z","abstract_excerpt":"The value of the $\\eta - \\eta'$ mixing angle $\\theta_P$ is phenomenologically deduced from a rather exhaustive and up-to-date analysis of data including strong decays of tensor and higher-spin mesons, electromagnetic decays of vector and pseudoscalar mesons, $J/\\psi$ decays into a vector and a pseudoscalar meson, and other transitions. A value of $\\theta_P$ between $-17^\\circ$ and $-13^\\circ$ is consistent with all the present experimental evidence and the average $\\theta_P=-15.5^\\circ\\pm 1.3^\\circ$ seems to be favoured."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9711229","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"}