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HK: Fachverband Physik der Hadronen und Kerne

HK 12: Invited Talks I

HK 12.1: Hauptvortrag

Dienstag, 12. März 2024, 11:00–11:30, HBR 14: HS 1

How to understand the hadron spectrum — •Meike Küßner — Ruhr-Universität Bochum

The spectroscopic observation of hadrons played a key role in the development of the quark model and the strong interaction. QCD predicts a zoo of "exotic" hadrons with more complex internal structures than the quark-antiquark mesons and three-quark baryons of the original quark model. Nowadays, there are experimentally observed states that are often assigned to the light meson or charmonium sector, indicating an exotic nature. Such exotic particles include glueballs, hybrids, and tetraquarks. Not only do these states pose a theoretical challenge, but experimentally it is often difficult to distinguish and characterize exotic and non-exotic matter. Here it helps to compare different production mechanisms and decay patterns. This provides additional constraints and allows a coupled channel partial wave analyses. Therefore, gluon-poor two-photon fusion events and gluon-rich hadronic reactions are used to disentangle the highly populated light meson spectrum. Sophisticated dynamical models and analysis tools need to be applied, respecting unitarity and analyticity. The talk will discuss recent experimental results and techniques and analyses methods in order to identify and characterize exotic and non-exotic QCD states.

Keywords: Hadron Spectroscopy; Partial Wave Analysis; QCD Exotics