2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/163904With U-spin symmetry, b->s and b->d penguin decays could be a subtle probe of CP violating new physics contributions. We show that, for B->PP (P stands for a pseudoscalar meson), the U-spin relation is expected to be violated for only one decay pair by assuming that new physics affects only b->s transition processes. We also very shortly discuss the polarizations of two types of U-spin pairs for B->VV (V stands for a vector meson).4 pages, Prepared for the proceedings of the Flavor Physics and CP Violation Conference, Taipei, 2008High Energy Physics - Phenomenologytext