A New Class of Solutions to the Strong CP Problem with a Small Two-Loop theta
classification
✦ hep-ph
keywords
classsolutionsthetaangleexamplesextendedgenerationgiven
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We present a new class of models which produce zero theta (QCD} 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 non-abelian generation symmetry. Two examples are given for this class of solutions.
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