Speaker
Description
We study a sequestered realization of spontaneous CP violation in an extension of the DFSZ axion framework.
CP is imposed at the Lagrangian level, so that all couplings and mass parameters are real.
The only physical source of CP violation arises from a PQ-invariant relative alignment of the singlet vacuum expectation values.
Since this CP-odd vacuum parameter is orthogonal to the axion direction, it does not spoil the PQ solution
to the strong CP problem. Vector-like quarks generate effective quark Yukawa textures in which
the CKM phase originates from mass-matrix misalignment, while the electroweak scalar sector
remains CP conserving in the sequestered limit. In the lepton sector, a minimal seesaw realization
with two heavy Majorana neutrinos yields a characteristic column-phase structure in the Dirac
mass matrix, so that both low-energy leptonic CP violation and the leptogenesis CP invariant
are controlled by the same vacuum origin of CP violation. We present a representative CKM fit
and illustrate the correlated implications for the PMNS Dirac phase and the baryon asymmetry,
demonstrating the viability of a single CP-violating origin linking CKM, PMNS, and leptogenesis
within an axion framework.