Leptonic decay constants for D-mesons from 3-flavour CLS ensembles

TL;DR

This paper reports on the progress of calculating leptonic decay constants for D-mesons using large-volume lattice QCD ensembles with improved Wilson quarks, covering various lattice spacings and pion masses.

Contribution

It presents new lattice QCD results for D-meson decay constants using 2+1 flavor ensembles with improved actions and multiple extrapolation strategies.

Findings

Decay constants are being accurately determined across multiple lattice spacings.

Extrapolation methods to physical masses are systematically applied.

Results contribute to precise determination of charm quark physics.

Abstract

We report on the status of an ongoing effort by the RQCD and ALPHA Collaborations, aimed at determining 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. To extrapolate to the physical masses, we follow both the 2m_l+m_s=const. and the m_s=const. lines in parameter space.