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Study of the OZI selection rule in hadronic processes |
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| Authors: | S. V. Golovkin A. P. Kozhevnikov V. P. Kubarovsky A. I. Kulyavtsev V. F. Kurshetsov L. G. Landsberg V. V. Molchanov V. A. Mukhin I. N. Nikitin V. I. Solyanik D. V. Vavilov V. A. Victorov M. Ya. Balatz G. V. Dzubenko G. S. Lomkatsi V. T. Smolyankin |
| Affiliation: | 1. Institute for High Energy Physics, Protvino 2. Institute of Theoretical and Experimental Physics, Moscow |
| Abstract: | In the experiments with LEPTON-F and SPHINX spectrometers the pion-induced charged exchange reactions π- + p → ? + n and π- + p → ω + n at Pπ-=32.5 GeV, as well as proton-induced diffractive reactions p + N → [p?] + N and p + N → [pω] + N at E p =70 GeV were studied. The comparison of the cross-sections for ? and ω-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 ? and ω-mesons R(?/ω) = (3 ± 1) · 10?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(?/ω)ozi = tg 2Δθ V ? 4 · 10?3). At the same time in proton reactions the effective ratio of ? and ω yields is ～ (4 ÷ 7) · 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 ss? component in the quark structure of protons. |
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