2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48633Using the next-to-leading order QCD-corrected effective Hamiltonian, charmless exclusive nonleptonic decays of the $B_s$ meson into $η$ or $η'$ are calculated within the generalized factorization approach. Nonfactorizable contributions are included with two different treatments. Some subtleties involved are discussed.7 pages, talk presented at the Fourth International Workshop on Particle Physics Phenomenology, Sun-Yat Sen University, Kaohsiung, Taiwan, June 18-21, 1998High Energy Physics - Phenomenologytext