Gauge Coupling Unification in GUT with Anomalous U(1) Symmetry

Abstract

We show that in the framework of grand unified theory (GUT) with anomalous $U(1{)}_A$ gauge symmetry, the success of the gauge coupling unification in the minimal SU(5) GUT is naturally explained, even if the mass spectrum of superheavy fields does not respect SU(5) symmetry. Because the unification scale for most realizations of the theory becomes smaller than the usual GUT scale, it suggests that the present level of experiments is close to that sufficient to observe proton decay via dimension 6 operators, $p\to e+\pi$.

4 pages, RevTeX, to appear in Phys.Rev.Lett

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• Leptogenesis in $E_6\times U(1{)}_A$ SUSY GUT model
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• Spontaneous CP violation in E6 SUSY GUT with SU(2) flavor and anomalous U(1) symmetries
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• Spontaneous SUSY breaking in natural SO(10) grand unified theory
• Spontaneous SUSY breaking without R-symmetry in supergravity
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