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 QCD — Sara Collins², •Kevin Eckert¹, Jochen Heitger¹, Stefan Hofmann², and Wolfgang Söldner² — ¹Institut 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 N_f=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 (2m_l + m_s) = const. and the m_s = const. line in parameter space.