Sufficiently Small $\barθ$ in $SU(3)^3 \times S_3$ Unification Model

Details Sufficiently Small $\barθ$ in $SU(3)^3 \times S_3$ Unification Model Sufficiently Small $\barθ$ in $SU(3)^3 \times S_3$ Unification Model

2002-04-05

arxiv.org/abs/hep-ph/0204074v2

Mod.Phys.Lett. A17 (2002) 1513-1524

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages LaTeX including 10 figures. Typo corrected

Scientific paper

10.1142/S0217732302007831

Since CP violation in weak decays is successfully described by the KM mechanism, the strong CP problem cannot easily be accommodated. This leads us to reconsider the issue. If the axion and massless up quark are abandoned, we must extend the standard model. Extension to $SU(3)^3 \times S_3$ unification leads to the following situation: {\it if} CP is a high-energy symmetry and the appropriate symmetry-breaking hierarchy of scales is in place, then the $\bar{\theta}$ parameter of the QCD sub-theory is guaranteed to be sufficiently small. We find $\bar{\theta} < 10^{-11}$ while the empirical limit from the neutron electric dipole moment requires only that $\bar{\theta} < 1.3 \times 10^{-10}$.

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