Flavor changing interactions mediated by scalars at the weak scale
  The quark and lepton mass matrices possess approximate flavor symmetries. Several results follow if the interactions of new scalars possess these approximate symmetries. Present experimental bounds allow these exotic scalars to have a weak scale mass. The Glashow-Weinberg criterion is rendered unnecessary. Finally, rare leptonic B meson decays provide powerful probes of these scalars, especially if they are leptoquarks. 
Aram Antaramian, Lawrence J. Hall, Andrija Ra\v{s}in