出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The modern theory of strong interactions is Quantum Chromodynamics (QCD), the quantum field theory of quarks and gluons based on the non-Abelian gauge group SU(3). It is part of the Standard Model of particle physics. QCD is well tested at high energies, where the strong coupling constant s is small and perturbation theory applies. In the low energy regime, however, QCD becomes a strongly coupled theory, many aspects of which are not understood. Some of the thriving questions are: How can we bring order into the rich and complex phenomena of low-energy QCD ? Are there effective degrees of freedom in terms of which we can understand the resonances and bound states of QCD efficiently and systematically ? Does QCD generate exotic structures so far undiscovered ? In order to answer these questions, dedicated experiments that test QCD in the non-perturbative regime and improve our limited understanding of these aspects of QCD are crucial. These measurements include the spectroscopy of QCD bound states, the search of new forms of hadronic matter, the study of nucleon structure and many more. In this talk I present an overview of the experimental status of hadron physics, pointing out the open questions and how they will be addressed by future experimental facilities.
