SMuK 2021 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 16: Invited Talks - III
HK 16.2: Invited Talk
Wednesday, September 1, 2021, 14:30–15:00, H1
The BGOOD experiment at ELSA - exotic structures in the light quark sector? — •Thomas Jude for the BGOOD collaboration — Physikalisches Institut, Universität Bonn
The recent discoveries of the pentaquark, PC, states and XYZ mesons in the charmed quark sector initiated a new epoch in hadron physics. The existence of exotic multi-quark states beyond the conventional three and two quark systems has obviously been realised. Intriguingly, similar states may be evidenced in the light, uds sector in meson photoproduction. Access to a low momentum exchange and forward meson production region is crucial. The BGOOD photoproduction experiment is uniquely designed to explore this kinematic region; it is comprised of a central calorimeter complemented by a magnetic spectrometer in forward directions.
Our results indicate a peak-like structure in the γ n → K0Σ0 cross section consistent with a meson-baryon interaction model which predicted the charmed PC states. The same K*Σ molecular nature of this proposed N*(2030) is also supported in our measurement of γ p → K+Λ(1405) (→ π0Σ0). Additionally, a sharp drop in the γ p → K+Σ0 cross section at very forward angles is observed.
In the non-strange sector, coherent meson photoproduction off the deuteron enables access to proposed dibaryon states. Preliminary data supports recent experimental claims of isoscalar and isovector dibaryons.
Supported by DFG projects 388979758/405882627 and the European Union*s Horizon 2020 programme, grant 824093.