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VOLUME 65 (1997) | ISSUE 8 | PAGE 590
Grand unification and heavy axion
We argue that sufficiently complex grand unified theories involving extra strong intractions that confine at very short distances, may lead to a heavy axion solution of the CP problem of QCD. This axion may have a mass within accessible energy range, and its low energy interactions emerge through mixing with axial Higgs boson(s). Another signature of this scenario is softly broken Peccei Quinn symmetry in the electroweak Higgs sector. We present a toy GUT exhibiting these features. PACS: 12.10.-g, 14.80.Mz