2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/40615Next-to-leading order QCD corrections to the width difference Delta Gamma in the B_s-meson system are presented. I further discuss how Delta Gamma can be used to detect new physics.10 pages, talk at RADCOR 2000, Carmel, USAHigh Energy Physics - Phenomenologytext