München 2009 – scientific programme

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T: Fachverband Teilchenphysik

T 16: Flavorphysik (Theorie) 3

T 16.5: Talk

Thursday, March 12, 2009, 17:45–18:00, M001

Alternative Quark and Lepton Yukawa coupling relations at the GUT scale — Stefan Antusch and •Martin Spinrath — Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Föhringer Ring 6, D-80805 München, Germany

In supersymmetric models the coupling of the bottom quarks to the Higgs fields can be changed significantly compared to the SM. These changes are due to SUSY threshold corrections, which are enhanced by tanβ and affect the Yukawa couplings. This type of corrections does not only affect the bottom quarks, but all down type quarks and the charged leptons as well. So the question arises, how strongly these threshold corrections change the Yukawa couplings at the GUT scale. We especially discuss here the effect on certain ratios of GUT scale Yukawa couplings and show that they can open up new possibilities in GUT model building beyond third family unification and Georgi Jarlskog relations.