Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1992-12-04
Phys.Lett.B300:367-372,1993
Physics
High Energy Physics
High Energy Physics - Phenomenology
BA-92-79, 14 pages, in LaTeX, no figures
Scientific paper
10.1016/0370-2693(93)91347-P
We show how in a class of models Peccei--Quinn symmetry can be realized as an automatic consequence of a gauged $U(1)$ family symmetry. These models provide a solution to the strong CP problem either via a massless $u$--quark or via the DFSZ invisible axion. The local family symmetry protects against potentially large corrections to $\overline{\theta} $ induced by quantum gravitational effects. In a supersymmetric extension, the `$\mu$--problem' is shown to have a natural solution in the context of gravitationally induced operators. We also present a plausible mechanism which can explain the inter--generational mass hierarchy in such a context.
Babu K. S.
Barr Sandra M.
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