München 2009 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 14: Flavorphysik (Theorie) 1
T 14.1: Vortrag
Dienstag, 10. März 2009, 16:45–17:00, M001
Calculation of heavy meson decay form factors using QCD light cone sum rules — •Christoph Klein1, Sven Faller1, Alexander Khodjamirian1, Thomas Mannel1, and Nils Offen2 — 1Theoretische Physik 1, Fachbereich Physik, Universität Siegen, D-57068 Siegen — 2Laboratoire de Physique Theorique CNRS/Univ. Paris-Sud 11, F-91405 Orsay, France
For the determination of CKM-matrix elements from exclusive semileptonic heavy meson decays it is important to know the corresponding form factors, which describe the hadronic dynamics. Since the form factors need some theoretical input, it is crucial to have a few independent calculations to extract the CKM-parameters from experimental data. One of these is the method of QCD sum rules, which will be applied here.
In this talk we present our results from the use of different versions of the method of light cone sum rules (LCSR) for the determination of the B→ D(*)- as well as the D→ π and D→ K-form factors. For B→ D(*) we use the new version of LCSR with B-meson-distribution amplitudes, which is applicable in the kinematical region of high recoil of the produced meson. The results are compared with recent experimental data and their expansion in the heavy quark mass is discussed. Concerning D→ π,K we employ and update the conventional LCSR with π/K-distribution amplitudes. With the calculated form factors we determine the ratio |Vcd|/|Vcs| from new experimental data.