Köln 2025 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HK: Fachverband Physik der Hadronen und Kerne

HK 24: Invited Talks I

HK 24.2: Hauptvortrag

Mittwoch, 12. März 2025, 11:30–12:00, Kurt-Alder HS Chemie

How well do we know the vector quarkonia? — •Nils Hüsken — Johannes Gutenberg-Universität Mainz

Quarkonia, mesons made from a heavy quark and an anti-quark, are considered to be the strong interaction analogues to the hydrogen atom. As such, the spectrum of the cc charmonium and bb bottomonium hadrons can be calculated using familiar methods from quantum mechanics. Experimentally, below the threshold for the decay into pairs of charm- (bottom-)flavoured hadrons the observed states match these calculations very well. Above that threshold, however, experiments have found a large number of new, exotic hadrons that do not match our expectations for regular quarkonium hadrons - the XYZ states. In e⁺e⁻ annihilation experiments, vector mesons with the same spin and parity as the photon are produced copiously, and indeed exotic vector-states like the Y(4230) and Υ(10753) have been reported in both the charmonium and bottomonium regions. Their interpretation is a matter of hot debate and largely depends on our knowledge of the highly excited regular vector quarkonium states. In this talk, I will summarize the experimental situation of the vector quarkonia, highlight the open questions relating to exotic hadrons, and present the ongoing effort to shed light on both the regular and exotic vector quarkonia above the open-flavour thresholds.

Keywords: Hadron spectroscopy; Charmonium; Bottomonium; Exotic hadrons; e+e- annihilation