Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 53: Hadron Structure and Spectroscopy X
HK 53.1: Gruppenbericht
Mittwoch, 30. März 2022, 16:00–16:30, HK-H9
The BGOOD Experiment at ELSA - Exotic Structures in the uds Sector? — •Johannes Groß for the BGOOD collaboration — Physikalisches Institut Bonn
The discoveries of the X-, Y-, Z-states in the hidden charm meson sector by Belle and the Pc baryon states by LHCb shed a new light on our understanding of hadronic structure formation: Multi-quark states beside the conventional qq and qqq states now have unambiguously been realised. Such states could manifest themselves as single color-bound objects or, contrary, as molecular-like meson-meson or meson-baryon formations. Intriguingly, similar effects to those in the charm sector may be evidenced in the light uds sector. In order to study this, access to extreme forward angles and low transverse momentum kinematics is mandatory. To realise this, the BGOOD experiment at ELSA combines a central calorimeter for neutral meson identification with a forward spectrometer for charged particle identification. First results of the BGOOD experiment that support the possibility of such exotic structures are presented, e.g. cross section measurements of γ p → K+ Λ (1405), γ p → K+ Σ0 and γ n → K0 Σ0 that show pronounced structures in the proximity of production thresholds.
Supported by DFG projects 388979758/405882627 and the European Union’s Horizon 2020 programme, grant 824093.