Speaker
Description
The strong CP problem is one of the most important problem in the standard model. One plausible approach is spontaneous CP violation, where CP is an exact symmetry but is spontaneously broken to introduce the observed Cabibbo-Kobayashi-Maskawa (CKM) phase without producing large strong CP phase. In this talk, we present a composite model of spontaneous CP violation in supersymmetric QCD. The scalar components of the meson chiral superfields obtain complex vacuum expectation values to break CP symmetry. Then, wavefunction renormalization for the quark kinetic terms induces the CKM phase, while the strong CP phase is protected by nonrenormalization of the superpotential (This mechanism is based on the mechanism invented by G. Hiller and M. Schmaltz). In our model, the right-handed down-type quark multiplets appear as composite states, whose large couplings to CP breaking fields naturally generate the observed CKM phase.
