Abstract: Exotic hadrons are among the most important discoveries in particle physics made over the past twenty years. These states made by more than three valence quarks are predicted by the quark models since its infancy, but have escaped a clear experimental identification until very recent times. The Belle experiment discovered the first exotic hadron with heavy quarks in 2004, and since then tens more have been observed, unveiling a vast family of poorly understood hadrons comprising at least four of five valence quarks with unexpected properties. Understanding the inner structure of these state or, in other words, how quarks arrange and interact with each other in these multi-bodies states, is a foundamental step towards a better understanding of Quantum-Chromo-Dyamics in its non-perturbative regime and of strongly coupled theories in general. However, none of the effective model proposed so far has provided complete and unequivocal predictions, and the problem remains open.
In this seminar I will outline the status of the heavy exotic sector, focusing on the open questions and and their implications, outlining which measurements can be performed by the existing experiments to progress the field further and discriminate between different models.
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https://uni-bonn.zoom-x.de/j/66253567797?pwd=R2MrNmNCQnl4K1hSejd6VnBEYXJ2QT09
Meeting ID: 662 5356 7797
Passcode: 599591
Maike Hansen, Saime Gürbüz