Charmed and light pseudoscalar meson decay constants from four-flavor lattice QCD with physical light quarks

A. Bazavov, C. Bernard, C. M. Bouchard +20

We compute the leptonic decay constants $f_{D^{+}}$, $f_{D_s}$, and $f_{K^{+}}$, and the quark-mass ratios $m_c/m_s$ and $m_s/m_l$ in unquenched lattice QCD using the experimentally de…