{"paper":{"title":"On the gluon content of the eta and eta' mesons","license":"","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"Barcelona), IFAE, J. Nadal (IFAE, R. Escribano (UAB","submitted_at":"2007-03-17T22:56:24Z","abstract_excerpt":"A phenomenological analysis of radiative $V\\to P\\gamma$ and $P\\to V\\gamma$ decays is performed with the purpose of determining the gluonic content of the $\\eta$ and $\\eta^\\prime$ wave functions. Our results show that within our model there is no evidence for a gluonium contribution in the $\\eta$, $Z_\\eta^2=0.00\\pm 0.12$, or the $\\eta^\\prime$, $Z_{\\eta^\\prime}^2=0.04\\pm 0.09$. In terms of a mixing angle description this corresponds to $\\phi_P=(41.4\\pm 1.3)^\\circ$ and $|\\phi_{\\eta^\\prime G}|=(12\\pm 13)^\\circ$. In addition, the $\\eta$-$\\eta^\\prime$ mixing angle is found to be $\\phi_P=(41.5\\pm 1.2"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0703187","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"}