{"paper":{"title":"QCD axial anomaly enhances the $\\eta \\eta^\\prime$ decay of the hybrid candidate $\\eta_1(1855)$","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["hep-ex","hep-lat","nucl-ex","nucl-th"],"primary_cat":"hep-ph","authors_text":"Hua-Xing Chen, Niu Su, Shi-Lin Zhu","submitted_at":"2022-02-10T09:19:24Z","abstract_excerpt":"We study the hybrid mesons with the exotic quantum number $I^GJ^{PC} = 0^+1^{-+}$ and investigate their decays into the $\\eta \\eta^\\prime$, $a_1(1260) \\pi$, $f_1(1285) \\eta$, $f_1(1420) \\eta$, $K^*(892) \\bar K$, $K_1(1270) \\bar K$, and $K_1(1400) \\bar K$ channels. We find that the QCD axial anomaly enhances the decay width of the $\\eta \\eta^\\prime$ channel although this mode is strongly suppressed by the small $P$-wave phase space. Our results support the interpretation of the $\\eta_1(1855)$ recently observed by BESIII as the $\\bar s s g$ hybrid meson of $I^GJ^{PC}=0^+1^{-+}$. The QCD axial an"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2202.04918","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2202.04918/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}