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GUT predictions for quark-lepton Yukawa coupling ratios with messenger masses from non-singlets

Stefan Antusch^1,2,*, Stephen F. King^3,†, and Martin Spinrath^4,5,‡

¹Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
²Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Föhringer Ring 6, D-80805 München, Germany
³School of Physics and Astronomy, University of Southampton, SO17 1BJ Southampton, United Kingdom
⁴SISSA/ISAS and INFN, Via Bonomea 265, I-34136 Trieste, Italy
⁵Institut für Theoretische Teilchenphysik, Karlsruhe Institute of Technology, Engesserstraße 7, D-76131 Karlsruhe, Germany

^*stefan.antusch@unibas.ch
^†king@soton.ac.uk
^‡martin.spinrath@kit.edu

Phys. Rev. D 89, 055027 – Published 27 March, 2014

DOI: https://doi.org/10.1103/PhysRevD.89.055027

Abstract

We propose new predictions from grand unified theories (GUTs) [applicable to both supersymmetric (SUSY) and non-SUSY models] for the ratios of quark and lepton Yukawa couplings. These new predictions arise from splitting the masses of the messenger fields for the GUT-scale Yukawa operators by Clebsch-Gordan factors from GUT symmetry breaking. This has the effect that these factors enter inversely in the predicted quark-lepton Yukawa coupling ratios, leading to new possible GUT predictions. We systematically construct the new predictions that can be realized in this way in SU(5) GUTs and Pati-Salam unified theories and discuss model building applications.

Article Text

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