Erlangen 2026 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 11: Hadron Structure and Spectroscopy III
HK 11.4: Talk
Tuesday, March 17, 2026, 17:30–17:45, PHIL C 301
K+Σ(1385)− photoproduction at the BGOOD experiment — •Martin Ludwig for the BGOOD collaboration — Physikalisches Institut, Universität Bonn
In the past twenty years, many exotic multi-quark states have been discovered in the heavy-quark sector. Although their exact binding mechanism is still under discussion, their proximity to certain thresholds suggests they may be molecular-like states. If so, one may expect similar states to appear in the light (uds) sector as well.
One way to search for such states is via photoproduction off the proton or neutron. The BGOOD experiment at the ELSA facility is ideally suited for these studies, as it combines a central calorimeter with a forward spectrometer that enables charged-particle reconstruction at extreme forward angles. These forward angles correspond to low momentum transfer to the recoil baryon, which may be a favourable condition for the formation of loosely bound molecular states.
Previous studies of strangeness-photoproduction channels at BGOOD have provided hints that exotic hadrons similar to the Pc pentaquarks may actually exist in the light-quark sector. In this context, another interesting channel to investigate is γ n → K+Σ(1385)−. Preliminary results for its differential cross section for beam energies ranging from threshold up to 2050 MeV will be presented.
Keywords: Strangeness photoproduction; BGOOD