Study of the OZI selection rule in hadronic processes

In the experiments with LEPTON-F and SPHINX spectrometers the pion-induced charged exchange reactions ?m + p M J + n and ?m + p M P + n at P?m = 32.5 GeV, as well as proton-induced diffractive reactions p + N M [p J] + N and p + N M [p P] + N at Ep = 70 GeV were studied. The comparison of the cross-sections for J and P-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 J and P-mesons R(J/P) = (3 - 1) · 10х is in a good agreement with naive quark model prediction based on the mixing in vector meson nonet and on the OZI rule (R(J/P)OZI = tg2( /V ­ 4 · 10х). At the same time in proton reactions the effective ratio of J and P yields is ~ (4 1 7) · 10ф, 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¥s component in the quark structure of protons.