“…For spectroscopy, exotics, heavy ions and charm production we refer the reader to the individual contributions [15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30] and we concentrate here on meson decays and mixing. Leptonic decays, like D + s → µ + + ν µ , posses the simplest hadronic structure, which is parameterised by a decay constant f D s :…”