Probing Supersymmetric Grand Unification through flavor physics

Flavor Changing Neutral Current (FCNC) and CP violating processes are a powerful tool to probe the Standard Model (SM) and, hence, to constrain or obtain indirect hints of New Physics (NP) beyond it. Within Supersymmetric Grand Unified theories it is generally possible to link processes occurring in the leptonic and hadronic sectors; thus, their correlated analysis provides a very interesting low energy test for a Grand Unified theory at high energies. Similarly to the FCNC decays, we also show that the Lepton Flavor Universality tests in low-energy systems (K-l2 and pi(l2)) offer a unique opportunity in shedding light on physics beyond the Standard Model; the smallness of NP effects is more than compensated, in terms of NP sensitivity, by the excellent experimental resolution and the good theoretical control.