Quark-squark alignment reexamined

We reexamine the possibility that the solution to the supersymmetric flavor problem is related to small mixing angles in gaugino couplings induced by approximate horizontal Abelian symmetries. We prove that, for a large class of models, there is a single viable structure for the down quark mass matrix with four holomorphic zeros. Consequently, we are able to obtain both lower and upper bounds on the supersymmetric mixing angles and predict the contributions to various flavor changing neutral current processes. We find that the most likely signals for alignment are Deltam(D) close to the present bound, significant CP violation in D-0-(D-o) over bar mixing, and shifts of the order of a few percent in various CP asymmetries in B-0 and B-s decays. In contrast, the modifications to radiative B decays, to epsilon(')/epsilon and to K-->pinu(nu) over bar decays are small. We further investigate a new class of alignment models, where supersymmetric contributions to flavor changing processes are suppressed by both alignment and RGE-induced degeneracy.