{"paper":{"title":"Measurement of the $\\eta$ -$\\eta'$ mixing angle in $\\pi^{-}$ and $K^{-}$ beams with GAMS-$4\\pi$ Setup","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ph"],"primary_cat":"hep-ex","authors_text":"A.A. Lednev, G.V. Khaustov, S.V. Donskov, V.A. Polyakov, V.D. Samoylenko, V.N. Kolosov, Yu.V. Mikhailov","submitted_at":"2013-01-29T17:03:39Z","abstract_excerpt":"The results of mixing angle measurement for $\\eta'$, $\\eta$ mesons generated in charge exchange reactions with $\\pi^{-}$ and $K^{-}$ beams are preseneted. When the $\\eta'$, $\\eta$ mesons are described in nonstrange(NS)--strange(S) quark basis the $\\pi^{-}$ and $K^{-}$ beams allow to study $|\\eta_{q}>$ and $|\\eta_{s}>$ parts of the meson wave function. The cross section ratio at $t'=0$ (GeV/c)$^{2}$ in the $\\pi^{-}$ beam is $R_{\\pi}(\\eta'/\\eta)= 0.56 \\pm 0.04$, results in mixing angle $\\phi_{P} = (36.8 \\pm 1.)^{o} $. For $K^{-}$ beam the ratio is $R_{K}(\\eta'/\\eta)= 1.30 \\pm 0.16$. It was found"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1301.6987","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"}