Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1996-10-28
Nucl.Phys.Proc.Suppl. 56A (1997) 303-310
Physics
High Energy Physics
High Energy Physics - Theory
14 pages, 8 PostScript figures, Invited contribution at LEAP-96, August 1996, Dinkelsbuehl, Germany, to be published in Nucl.
Scientific paper
10.1016/S0920-5632(97)00292-2
Two-step mechanisms in the $N\bar{N}$ annihilation and their role in the OZI rule violating reactions are discussed. In particular the two meson rescattering mechanism for $\pi\phi$ channel including all off-shell effects is typically two orders of magnitude bigger than the OZI tree level expectation and explains the observed ratio $\phi \pi/\omega \pi$ in the annihilation at rest. The rates for the final states including photons, $\gamma\omega$ and $\gamma\phi$, can be explained in the vector dominance model. The observed rate for $p\bar{p}\to\gamma\omega$ is suppressed due to destructive interference between the intermediate $\rho$ and $\omega$ states while the interference in $p\bar{p}\to\gamma\phi$ is required to be constructive leading to a large ratio $\gamma\phi/\gamma\omega$.
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