Karlsruhe 2011 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 10: QCD (Theorie) I
T 10.6: Vortrag
Mittwoch, 30. März 2011, 18:00–18:15, 30.23: 10-1
Non-diagonal current correlators with two different masses up to three-loop order — •Jens Hoff, Johann Kühn, and Matthias Steinhauser — Institut für Theoretische Teilchenphysik, Karlsruher Institut für Technologie
Current correlators provide an important tool to relate theoretical calculations and experimental measurements. In this talk non-diagonal correlators of scalar, pseudoscalar, vector and axialvector currents are considered coupling to fermions with two different masses m1 and m2. We evaluate moments up to three-loop order considering the hierarchies m1 ≫ m2 and m1 ≈ m2. It is shown that the combination of the two expansions leads to an excellent approximation of the exact result.