Grand Unified Flavour Physics

We probe the unification of down quarks and leptons in a supersymmetric SO(10) GUT The large atmospheric neutrino mixing aisle induces b(R) - S(R) transitions, which can account for the sizeable CP phase phi(s) measured in B(s) - (B) over bar (s) mixing Corrections to down-quark-lepton unification from higher-dimensional Yukawa terms translate neutrino mixing also into s(R) - d(R) and b(R) - d(R) currents We find the flavour structure of Yukawa corrections to be strongly constrained by epsilon(K)