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Strong QCD

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Strong interactions at low energies are one of the most challenging topics of contemporary physics. The underlying gauge theory -- Quantum Chromodynamics -- exhibits color confinement and spontaneous chiral symmetry breaking. The structure and dynamics of hadrons are investigated to unravel the physics behind these phenomena using effective field theories and lattice simulations. Chiral perturbation theory (CHPT) allows to systematically analyse the structures of the spontaneously and explicitly broken chiral symmetry of QCD, in particular the structure and dynamics of the Goldstone bosons and the ground state baryons. Extensions to describe meson and baryon resonances as well as established and newly discoverd exotic states are being developed. Furthermore, we investigate methods to deal with the sizeable chiral corrections in the strange quark sector. Chiral effective field theories are also developed in connection with lattice QCD providing extrapolations in the quark masses and finite volume corrections. In particular, methods are developed to extract excited state properties from lattice simulations. These methods are complemented by dispersion relations to study, e.g., the structure of the nucleon and pion-nucleon scattering. Our studies are directly related to the experimental programs performed and planned at ELSA (Bonn), COSY (Juelich), FAIR (Darmstadt), MAMI (Mainz), JLab (Newport News), DAFNE (Frascati), J-PARC (Tokai), BES (Bejing) and CERN (Genf).
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