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Power-suppressed corrections arising from end-point integration regions tothe space-like vertex function of the massive eta'-meson virtual gluontransition eta' - g*g* are computed. Calculations are performed within thestandard hard-scattering approach (HSA) and the running coupling methodsupplemented by the infrared renormalon calculus. Contributions to the vertexfunction from the quark and gluon contents of the eta' -meson are taken intoaccount and the Borel resummed expressions for F_{eta' g*g*}(Q2,\omega ,\eta),as well as for F_{eta' g g*}}(Q^{2},\omega =\pm 1,\eta) and F_{eta'g*g*}(Q^{2},\omega =0,\eta) are obtained. It is demonstrated that thepower-suppressed corrections \sim (\Lambda ^{2}/Q^{2})^{n}, in the exploredrange of the total gluon virtuality 1 <Q2 < 25 GeV2, considerably enhance thevertex function relative to the results found in the framework of the standardHSA with a fixed coupling. Modifications generated by the eta ' -meson masseffects are discussed.

Soft end-point and mass corrections to the eta' g*g* vertex function

Soft end-point and mass corrections to the eta' gg vertex function