Twisted Split Fermions, Flavor and the Strong CP problem

The framework of split fermions [Arkani-Hamed and Schmaltz] explain the flavor hierarchies in the standard model without invoking symmetries by generating small overlaps between wavefunctions in an extra dimension. However, in previous models an enhanced symmetry was assumed for simplicity. In this talk I present the consequence of relaxing this assumption, which yields `twisted split fermions'. I show that the added twist does not damage the appealing features of split fermions. Furthermore, the twist introduces a new source of CP violation which may be used to explain the smallness of the strong CP phase in a model of spontaneous CP breaking. The framework of twisted split fermions can thus solve the Flavor and Strong CP problems in conjunction.
hep group