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T: Fachverband Teilchenphysik

T 16: Flavourphysik (Theorie) II

T 16.2: Vortrag

Donnerstag, 18. März 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.