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arXiv · hep-ph/9511431

Quantum Restoration of the U(1)_Y Symmetry in Dynamically Broken SUSY-GUT's

T. Hotta·K. -I. Izawa·T. Yanagida
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Abstract

We propose a supersymmetric hypercolor SU(3)_H gauge theory interacting strongly at the grand unification scale, in which the hyperquark condensation breaks SU(5)_GUT down to SU(3)_C x SU(2)_L without unbroken U(1)_Y at the classical level. However, we show that the broken U(1)_Y symmetry is restored by quantum mechanical effects and hence there remains the standard-model gauge symmetry at the electroweak scale. The dynamics of the strong interactions also produces naturally a pair of massless Higgs doublets. In addition to these Higgs doublets, we have a pair of massless singlets which contributes to the renormalization-group equations of gauge coupling constants and hence affects the GUT unification. We discuss a simple solution to this problem.

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T. Hotta, K. -I. Izawa, T. Yanagida. 1995-11-28. Quantum Restoration of the U(1)_Y Symmetry in Dynamically Broken SUSY-GUT's. https://doi.org/10.1016/s0370-2693(97)00797-1

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