Year: 1999
Type: article
Abstract: We discuss the anomalous U(1) gauge symmetry as a mechanism of generating the grand-unification (GU) scale. We conclude that unification to a simple group cannot be realized unless some parameters are ``tuned,'' and that models with product gauge groups are preferred. We consider the ``$R$-invariant natural unification'' model with gauge groups $\mathrm{SU}{(5)}_{\mathrm{GUT}}\ifmmode\times\else\texttimes\fi{}\mathrm{U}{(3)}_{H}.$ In this model the doublet-triplet splitting problem is solved and the unwanted GU theory (GUT) relation ${m}_{s}{=m}_{\ensuremath{\mu}}$ is avoided maintaining ${m}_{b}{=m}_{\ensuremath{\tau}}.$ Moreover, $R$ invariance suppresses the dangerous proton decays induced by dimension four and five operators.
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2060907116