2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49040The complete calculation of the lowest order short-distance contributions to the $B_{s}\toγγ$ decay in the SM are presented. The amplitude and branching ratio are calculated.7 pages, latexHigh Energy Physics - PhenomenologyThe lowest-order short-distance contribution to the $B_{s}\toγγ$ decaytext