Does confinement imply CP invariance of the strong interactions?

Abstract

The strong coupling constant $1/g^2$ and the vacuum angle $θ$ of the SU(3) Yang-Mills theory are investigated in the infrared limit under the renormalization group flow. It is shown that the theory has an infrared attractive fixed point at $1/g^2 = θ= \,0$, which leads to linear confinement and naturally solves the strong CP problem. In particular, any initial value of $θ\neq 0$ is found to be driven to $θ= 0$ at macroscopic distances, where quarks and gluons freeze into hadrons by the confinement mechanism.