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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 $R_{K}(\\eta'/\\eta)= 1.30 \\pm 0.16$. 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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 $R_{K}(\\eta'/\\eta)= 1.30 \\pm 0.16$. 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