Leptonic Ds decays in two-flavor lattice QCD

We report on a two-flavor lattice QCD study of the Ds and Ds* leptonic decays parametrized by the decay constants fDs and fDs*. As the phenomenology in the Ds sector seems very promising in the next years with the experiments LHCb and Belle II, it is worth putting a big effort in lattice computations regarding its nonperturbative QCD contributions. Before examining more challenging processes such as hadron-hadron transitions, a natural first step is to address some basic aspects in the context of leptonic decays, where systematic uncertainties from excited state contaminations and cut-off effects in the computation of charmed meson decay matrix elements can be investigated in a more straightforward setting.