String scale unification in an SU(6)xSU(2) GUT
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Rizos, J.
Tamvakis, K.
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peer reviewed
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Physics Letters B
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We construct and analyze an SU(6) X SU(2) GUT. The model is k=1 string embedable in the sense that we employ only chiral representations allowed at the k = 1 level of the associated Kac-Moody Algebra. Both cases SU(6) X SU(2), and SU(6) X SU(2), are realized. The model is characterized by the SU(6) X SU(2) --> SU(4) X SU(2) X SU(2) breaking scale M-x, and the SU(4) X SU(2) X SU(2) --> SU(3)(C) X SU(2)(L) X U(1)(Y) breaking scale M-R. The spectrum bellow M-R includes an extra pair of charge-1/3 colour-triplets of mass M-I less than or equal to M-R that does not couple to matter fields and, possibly, an extra pair of isodoublets. Above M-X the SU(6) and SU(2) gauge couplings always unify at a scale which can be taken to be the string unification scale M-s similar to 5 X 10(17) GeV. The model has Yukawa coupling unification since quarks and leptons obtain their masses from a single Yukawa coupling. Neutrinos obtain acceptably small masses through a see-saw mechanism. Coloured triplets that couple to matter fields are naturally split from the coexisting isodoublets without the need of any numerical fine tuning. (C) 1997 Elsevier Science B.V.
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gauge-coupling unification, grand unified theories, standard-like model, 4-dimensional superstrings, gravitational couplings, threshold corrections, anomaly cancellation, moduli corrections, symmetry-breaking, loop corrections
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<Go to ISI>://000071063500007
http://ac.els-cdn.com/S0370269397011817/1-s2.0-S0370269397011817-main.pdf?_tid=141b15451f73af3430da9f463d17deec&acdnat=1334232221_f5b6613dd0c4425e5297ab0a2085c78c
http://ac.els-cdn.com/S0370269397011817/1-s2.0-S0370269397011817-main.pdf?_tid=141b15451f73af3430da9f463d17deec&acdnat=1334232221_f5b6613dd0c4425e5297ab0a2085c78c
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en
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Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών