2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41150The effective $η^\prime g^* g^*$ vertex is studied in the standard (Brodsky-Lepage) and modified hard scattering approaches for arbitrary gluon virtualities in the time-like and space-like regions. The contribution of the gluons in the $η^\prime$-meson is taken into account, and the wave-function is constrained using data on the electromagnetic transition form factor of the $η^\prime$ meson. Our results have implications for the inclusive decay $B \to η^\prime X$ and exclusive decays, such as $B \to η^\prime (K, K^*)$, and in hadronic production processes $N + N (\bar N) \to η^\prime X$.19 pages, 6 figures (requires amssymb, epsf); Invited Talk; Conference of the Nuclear Physics Department of the Russian Academy of Sciences: Fundamental Interactions of Elementary Particles, Moscow, November 27 -- December 1, 2000High Energy Physics - Phenomenologytext