Abstract
ISR data on the ratios η/π 0, η′/π 0 and ω/π 0 at medium to high transverse momentum are examined in the context of prompt meson production through the higher twist mechanism in addition to the standard process of parton scattering and fragmentation. The η′/π 0 ratio in particular, can only be well understood by a sizeable prompt contribution in good agreement with the large η′ cross section expected from higher twist calculations. Furthermore, by neglecting any glue component in the η′, a pseudoscalar mixing angle of ≈ −15° is preferred, slightly lower than some recent measurements.
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