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From quarks and gluons to mesons - the Bethe-Salpeter equation in QCD The hadrons which make up ordinary matter (protons and neutrons) can be described as bound states of quarks and gluons, the fundamental fields of Quantum Chromodynamics (QCD). Protons and neutrons are baryons, consisting mainly of 3 quarks. This talk focuses on another particular type of hadrons, the mesons, which are bound states of mainly quarks and anti-quarks. Properties of such states can be studied using a relativistic bound state equation, the Bethe-Salpeter equation (BSE). As quarks are important ingredients for the bound state calculation, some of their properties, like dynamical mass generation and chiral symmetry breaking will be discussed. Furthermore, I will present some results on meson mass spectra and decays. |