SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 23: Invited Talks III

HK 23.3: Hauptvortrag

Mittwoch, 22. März 2023, 12:00–12:30, HSZ/0002

The world of light and strange mesons: from spectroscopy puzzles to low energy QCD phenomena — •Stephan Paul for the COMPASS collaboration — Technical University of Munich, Physics Department, Garching, Germany — Max-Planck-Institute for Physics, Munich, Germany

After 20 years of data taking, the COMPASS experiment looks back on important contributions in the fields of nucleon spin-structure, light-hadron spectroscopy, and measurements related to very-low-energy QCD. Here, we report new insights into the mesonic excitation spectrum based on the world's largest data set, which provides access to all iso-vector mesons in a self-consistent manner using novel analysis techniques. In addition to excitations with high angular momentum, we have unraveled exotic mesons and discovered new mesonic structures even at low masses whose interpretation is still unclear. At very low energies, QCD can be described by effective interactions in the framework of chiral perturbation theory. We have challenged numerous precision calculations with high accuracy even in multidimensional analyses. COMPASS has proven to be a versatile precision instrument allowing for studies of QCD with high energy beams complementary to low energy facilities.