Gießen 2024 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 35: Hadron Structure and Spectroscopy V
HK 35.1: Group Report
Tuesday, March 12, 2024, 17:30–18:00, HBR 62: EG 19
The study of unconventional baryon structure in the light quark sector with the BGOOD experiment — •Thomas Jude for the BGOOD collaboration — Physikalisches Institut, Universität Bonn
The existence of exotic multi-quark states beyond the conventional valence three quark and quark-antiquark systems has been unambiguously confirmed in the heavy quark sectors and equivalent structures may be evidenced in the light, uds sector. The BGOOD photoproduction experiment at ELSA is ideal to study spatially extended, molecular-like structure which may manifest in reaction mechanisms. BGOOD is comprised of a central calorimeter for neutral meson momentum reconstruction and complemented by a magnetic spectrometer in forward directions for charged particle identification.
Our published results in the strangeness sector may suggest a dominant role of meson-baryon dynamics which has an equivalence to the PC states in the charmed sector. This includes structure in K0Σ0 and K+(Λ(1405)→ π0Σ0) photoproduction at the K*Y thresholds.
In the non-strange baryon-baryon sector, coherent meson photoproduction off the deuteron enables access to proposed dibaryon states, including the recently discovered d*(2380). Our measured differential cross sections at forward angles challenge conventional descriptions of coherent photoproduction, which should be suppressed due to the large momentum transferred to the deuteron.
Supported by DFG projects 388979758/405882627 and the European Union’s Horizon 2020 programme, grant 824093.
Keywords: BGOOD; Photoproduction; ELSA