Phys. Rev. D 70, 051901(R) (2004) [5 pages]New class of solutions to the strong CP problem with a small two-loop θ
We present a new class of models which produce zero θQCD angle at the tree and one-loop level due to Hermiticity of sub-blocks in the extended quark mass matrices. The structure can be maintained typically by nonAbelian generation symmetry. Two examples are given for this class of solutions. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.70.051901
DOI:
10.1103/PhysRevD.70.051901
PACS:
11.30.Er, 11.30.Hv, 12.60.Fr, 14.80.Cp
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