Karlsruhe 2011 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 19: Beyond the Standard Model (Theorie) IV
T 19.7: Vortrag
Freitag, 1. April 2011, 15:30–15:45, 30.23: 6-1
Two-Loop Matching of Gauge Couplings in Grand Unified Theories — •Waldemar Martens, Luminita Mihaila, and Matthias Steinhauser — Karlsruhe Institut of Technology (KIT)
As experimental accuracy on the gauge couplings is increasing, also higher order corrections in the gauge coupling unification analysis become more and more important. We calculate the two-loop matching corrections for the gauge couplings at the Grand Unification scale in a general framework that aims at making as few assumptions on the underlying Grand Unified Theory (GUT) as possible. In this talk we present an intermediate result that is general enough to be applied to the Georgi-Glashow SU(5) as a "toy model". The numerical effects in this theory are found to be larger than the current experimental uncertainty on αs(MZ). The technical issues that have been solved for this calculation are useful preparative work for the extension of the result to supersymmetric GUTs.