Hadron Spectroscopy with Strangeness

Studies of exotic baryon structure via strangeness photoproduction at BGOOD

4 Apr 2024, 14:00

30m

Main building, Room 253 (University of Glasgow)

Session 6

Speaker

Dr Thomas Jude (The University of Bonn)

Description

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. Such states could manifest as single colour bound objects, or evolve from meson-baryon and meson-meson interactions, creating molecular like systems and re-scattering effects near production thresholds. Equivalent structures may be evidenced in the light, uds sector. This is investigated with the BGOOD photoproduction experiment at ELSA. BGOOD accesses low momentum (low $t$) exchange kinematics, which is ideal to study spatially extended, molecular-like baryon structure which may manifest in reaction mechanisms.

Our published results in the strangeness sector suggest a dominant role of meson-baryon dynamics which has an equivalence to the $P_C$ states in the charmed sector. Highlights include structure in $K^0{\mathrm{\Sigma }}^0$ and $K^{+}(\mathrm{\Lambda }(1405)\to {\pi }^0{\mathrm{\Sigma }}^0)$ photoproduction at $K^{\ast }Y$ thresholds and new data for forward $K^{+}{\mathrm{\Sigma }}^0(1385)$ photoproduction.

Supported by DFG projects 388979758/405882627 and the European Union’s Horizon 2020 programme, grant 824093.

Presentation materials

GlasgowWorkshop24_Jude.pdf