C. Landberg et al., TEST OF THE OZI RULE IN HADROPRODUCTION OF PHI-PHI AND PHI-K-(K), Physical review. D. Particles and fields, 53(5), 1996, pp. 2839-2842
The cross sections for phi phi and phi K+K- production were measured w
ith 8 GeV/c pion and kaon beams to examine the OZI suppression of the
reaction pi(-)p --> phi phi n. The measured cross section ratios indic
ate that this reaction is not suppressed for phi phi invariant masses
up to 2.5 GeV/c(2).