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Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 19: Flavourphysik (Theorie)

T 19.8: Talk

Monday, March 27, 2017, 18:30–18:45, VSH 06

Pseudo-scalar D-meson decay constants from three- flavour lattice QCDSara Collins2, •Kevin Eckert1, Jochen Heitger1, Stefan Hofmann2, and Wolfgang Söldner21Institut für Theoretische Physik, Universität Münster — 2Institut für Theoretische Physik, Universität Regensburg

We report on the status of an ongoing effort by the RQCD and ALPHA Collaborations, aimed at determining masses and leptonic decay constants of charmed mesons. Our analysis is based on large-volume ensembles generated within the CLS effort, employing Nf=2+1 non-perturbatively O(a) improved Wilson quarks, tree-level Symanzik-improved gauge action and open boundary conditions. The ensembles cover lattice spacings from a ≈ 0.09 fm to a ≈ 0.05 fm, with pion masses varied from 420 to 200 MeV. Furthermore we report on our implementation of distance preconditioning for the calculation of heavy quark propagators and resulting accuracy improvements for the extraction of charmed meson masses and decay constants. To extrapolate to the physical masses, we follow both the (2ml + ms) = const. and the ms = const. line in parameter space.

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