Wide-angle photoproduction of the η'-meson and its gluon content
Abstract
We investigate wide-angle photoproduction of the η' meson within the handbag approach to twist-3 accuracy. It turns out that, due to the gluon content of the η', this process is dominated by twist-2 in contrast with pion and η photoproduction. Using the presently available information on the twist-2 and twist-3 distribution amplitudes and on the η - η' mixing, we provide prediction for the η' cross section and helicity correlations. It is argued that η' photoproduction is well suited to improve our knowledge of the two-gluon distribution amplitude.
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