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IHEP 97 - 20
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| Golovkin S.V. et al. | ||
| Study of the OZI Selection Rule in Hadronic Processes. | ||
| Protvino, 1997.- p.19, figs. 14, refs.:44. | ||
In the experiments with LEPTON-F and SÐHINX spectrometers the pion-induced charged exchange reactions $\pi^- + p \rightarrow \phi + n$ and $\pi^- + p \rightarrow \omega+n$ at $P_{\pi^-}$=32.5 GeV, as well as proton-induced diffractive reactions $p+N \rightarrow [p \phi]+N$ and $p+N \rightarrow [p \omega]+N$ at $E_p$=70 GeV were studied. The comparison of the cross-sections for $\phi$ and $\omega$-production in these reactions is used for testing the OZI selection rule in hadronic processes. It has been demonstrated that in pion reactions the ratio of the yields of $\phi$ and $\omega$-mesons $R(\phi/\omega)=(3\pm1)\cdot10^{-3}$ is in a good agreement with naive quark model prediction based on the mixing in vector meson nonet and on the OZI rule $(R(\phi/\omega)_{OZI}= tg^2\Delta \theta_V \simeq 4 \cdot 10^{-3}$). At the same time in proton reactions the effective ratio of $\phi$ and $\omega$ yields is $\sim (4\div7)\cdot 10^{-2}$, i.e. a strong violation of the OZI rule is observed in proton-nucleon interactions. This violation can be in favor of possible existence of some exotic $s \bar s$ component in the quark structure of protons.
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