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IHEP 2012 - 22 (In Russian) | |
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S.V.Donskov,
V.N.Kolosov,
A.A.Lednev,
Yu.V.Mikhaylov,
V.A.Polyakov,
V.D.Samoylenko,
G.V.Khaustov
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Measurement of the mixing angle in pseudoscalar meson sector in $\pi^{-}$ and $K^{-}$ beams
with GAMS-$4\pi$ Setup at the beam momentum 32 GeV/c
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| Protvino, 2012. – p. 8, figs. 4, tables 1, refs.: 11. | ||
The results for mixing angle measurement and $\eta'$, $\eta$ mesons production in $\pi^{-}$ 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 $|\eta_{q}\rangle$ and $|\eta_{s}\rangle$ 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 that gluonium content in $\eta'$ is $\sin^{2}\psi_{G}= 0.15 \pm 0.06$. The experiment was carried out with GAMS-4$\pi$ Setup.
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