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T: Fachverband Teilchenphysik

T 14: Flavourphysik (Theorie) I

T 14.8: Talk

Thursday, March 31, 2011, 18:30–18:45, 30.23: 3-1

B-meson distribution amplitudes — •Michael Knödlseder and Nils Offen — Universität Regensburg, Deutschland

We have calculated 2--to--2 renormalisation kernels of heavy-light light-ray operators in coordinate space using light-cone gauge. Special attention will be turned to meson-vacuum matrix elements of these operators, the B- or D-meson light-cone distribution amplitudes (LCDA). At one loop level light-cone gauge reduces all renormalisation kernels to two-particle kernels. The three particle kernels can be constructed by simply adding the previously calculated two-particle kernels. Calculations are performed in heavy quark effective theory (HQET). Our results can be compared with the light-light case where the renormalisation kernels exhibit conformal symmetry. We will discuss which symmetries of the full conformal group survive after applying the heavy quark limit of QCD and the renormalisation procedure.