Bonn 2010 – scientific programme
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T: Fachverband Teilchenphysik
T 16: Flavourphysik (Theorie) II
T 16.2: Talk
Thursday, March 18, 2010, 17:00–17:15, HG XIII
Quark and Lepton Yukawa coupling ratios in GUTs — Stefan Antusch1, Stephen F. King2, Michal Malinsky3, and •Martin Spinrath1 — 1Max-Planck-Institut für Physik (Werner-Heisenberg-Institut) Föhringer Ring 6, D-80805 München, Germany — 2School of Physics and Astronomy, University of Southampton, SO17 1BJ Southampton, United Kingdom — 3Department of Theoretical Physics, School of Engineering Sciences, Royal Institute of Technology (KTH) -- AlbaNova University Center, Roslagstullsbacken 21, 106 91 Stockholm, Sweden
The down-type quark and charged lepton Yukawa couplings in supersymmetric models depend strongly on the SUSY spectrum for large tan beta due to 1-loop threshold effects. Therefore also the GUT scale Yukawa coupling ratios depend on the SUSY parameters. The observed fermion masses together with common SUSY breaking scenarios and phenomenological constraints give possible ranges for these ratios which can be compared with predictions from SUSY GUTs. We discuss the viable predictions and their possible realisations in GUT model building.