A distinct isotopic π-η interference effect in φ photoproduction at √s~2--5 GeV region is identified by examining the Pomeron- and meson-exchange amplitudes. This isotopic interference effect is a consequence of the SU(3) symmetry and the isotopic structure of the γNN coupling in the direct φ-radiation amplitude. It can be tested experimentally by measuring differences in the polarization observables between the γ→pφp and γ→nφn reactions.
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Titov et al. (1999) studied this question.
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