STUDY OF THE OZI SELECTION RULE IN HADRONIC PROCESSES

In the experiments with LEPTON-F and SPHINX spectrometers the pion-ind uced charged exchange reactions pi(-) + p --> phi + n and pi(-) + p -- > omega + n at Ppi- = 32.5 GeV, as well as proton-induced diffractive reactions p + N --> [p phi] + N and p + N --> [p omega] + N at E-p = 7 0 GeV were studied. The comparison of the cross-sections for phi and o mega-production in these reactions is used for testing the OZI selecti on rule in hadronic processes. It has been demonstrated that in pion r eactions the ratio of the yields of phi and omega-mesons R(phi/omega) = (3 +/- 1).10(-3) is in a good agreement with naive quark model predi ction based on the mixing in vector meson nonet and on the OZI rule (R (phi/omega)(OZI) = tg(2) Delta theta(V) similar or equal to 4.10(-3)). At the same time in proton reactions the effective ratio of phi and o mega yields is similar to (4 divided by 7).10(-2), i.e. a strong viola tion of the OZI rule is observed in proton-nucleon interactions. This violation can be in favor of possible existence of some exotic <s(s)ov er bar> component in the quark structure of protons.