2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/186814A few $B_{d,s}$ and $Λ_b$ decays induced by $b \to s$ transition are studied in the Standard Model and in the framework of the Appelquist, Cheng and Dobrescu (ACD) model, which is a New Physics scenario where a single universal extra dimension is considered. In particular, we investigate the sensitivity of the observables to the radius $R$ of the compactified extra dimension.LaTex, 7 pages, 4 eps figures. Contribution to the International Workshop QCD@Work 2007, June 16-20, Martina Franca - ItalyHigh Energy Physics - Phenomenologytext