Seminar: Tetraquarks -- Do they matter? (Frank Nerling)

The recently discovered XYZ states in the charmonium region are discussed to be exotic states. The subject of hadron spectroscopy and QCD bound states is introduced. A selection of relevant results obtained by the BESIII experiment are presented. Moreover, unique possibilities of the future PANDA experiment to contribute to solve the XYZ puzzle are discussed. Finally, interdisciplinary connections to astrophysics are pointed out.