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T: Fachverband Teilchenphysik

T 18: Flavourphysik (Theorie) 1

T 18.3: Vortrag

Donnerstag, 1. März 2012, 17:15–17:30, VG 3.102

Decay constants of heavy-light vector mesons from QCD sum rules — Alexander Khodjamirian, Alexei A. Pivovarov, Patrick Gelhausen, and •Denis Rosenthal — Universität Siegen, Deutschland

We revisit the QCD sum rules for the B^* and D^* decay constants obtained from two-point correlation functions of heavy-light currents. We recalculated the operator product expansion in MS-scheme with O(α_s) accuracy for the perturbative part and quark condensates contribution. Furthermore, known corrections of O(α_s²) are also incorporated. The results are compared with the decay constants of B and D-mesons to quantify the heavy-quark symmetry violation. These results can also be used to extract the B^*Bπ and D^*Dπ strong couplings from QCD light cone sum rules.