Determination of the light quark masses
Prof. Dr. Gilberto Colangelo (Institut für Theoretische Physik, Universität Bern)

Quark masses are fundamental parameters of the standard model.
Those of the heavy quarks determine to a large extent the masses of the hadrons in which they appear as constituents, and are, in a loose sense, almost directly measurable. Those of the light quarks, on the other hand, give rise to much more subtle effects and are more difficult to extract from experimental observables. I will review different ways to get information on the light quark masses from the phenomenology and discuss in some more detail the role of η → 3π decays. I will also present an overview of the lattice determinations of these parameters.