Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 22: Hadronenstruktur und -spektroskopie
HK 22.4: Vortrag
Mittwoch, 21. März 2012, 15:00–15:15, RW 1
SU(3) breaking corrections to the D, D*, B and B* decay constants — •Michael Altenbuchinger1, Lisheng Geng2,1, and Wolfram Weise1 — 1Physik Department, Technische Universität München, D-85747 Garching — 2School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
We report on a first next-to-next-to-leading order calculation of the decay constants of the D (D*) and B (B*) mesons using a covariant formulation of chiral perturbation theory. It is shown that, using the state-of-the-art lattice QCD results on fDs /fD as input, one can predict quantitatively the ratios of fDs*/fD*, fBs/fB, and fBs*/fB* taking into account heavy-quark spin-flavor symmetry breaking effects on the relevant low-energy constants. The predicted relations between these ratios, fDs*/fD*<fDs /fD and fBs/fB>fDs /fD, and their light-quark mass dependence should be testable in future lattice QCD simulations, providing a stringent test of our understanding of heavy quark spin-flavor symmetry, chiral symmetry and their breaking patterns.
Work supported in part by BMBF, the A.v. Humboldt foundation, GSI and the DFG Excellence Cluster "Origin and Structure of the Universe".