Köln 2025 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 56: Hadron Structure and Spectroscopy VII
HK 56.1: Group Report
Thursday, March 13, 2025, 17:30–18:00, HS 3 Physik
Evidence of pentaquark-like states in strangeness photoproduction at the BGOOD experiment — •Antonio Joao Clara Figueiredo for the BGOOD collaboration — Physikalisches Institut, Universität Bonn
Exotic multi-quark states have been confirmed in the heavy quark sectors and equivalent structures may be evidenced in the light, uds sector as well.
The BGOOD experiment at the ELSA facility is ideal for the study of strangeness photoproduction in the region of low momentum exchange to the hyperon. 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 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 threshold. Additionally, the differential cross section for K+Σ0 photoproduction at forward angles shows a peak-like structure at the K+Σ(1385) threshold, potentially indicating the formation of a bound molecular state. This is further supported by a peak in K+Σ(1385) exactly at threshold, which is consistent with model calculations of on-shell production of the constituents of molecular states.
Supported by DFG projects 388979758/405882627 and the European Union’s Horizon 2020 programme, grant 824093.
Keywords: BGOOD; Photoproduction; Strangeness; Pentaquark