Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 11: Hadron Structure and Spectroscopy II

HK 11.2: Talk

Tuesday, March 28, 2017, 11:15–11:30, F 5

Hyperon Photoproduction with the BGO-OD Experiment* — •Georg Scheluchin for the BGO-OD collaboration — Physikalisches Institut, Nussallee 12, D-53115 Bonn

One aim of the BGO-OD experiment is the investigation of non-strange and strange hyperon photoproduction. The setup combines a large aperture forward magnetic spectrometer and a central BGO crystal calorimeter covering the polar angles up to 12^∘ and 25^∘ to 155^∘, respectively. The acceptance gap in between is covered by a segmented plastic scintillator.

Since the discovery of the Λ(1405), it remains poorly described by conventional constituent quark models, and it is a candidate for having an "exotic" meson-baryon or "penta-quark" structure, similar to states recently reported in the hidden charm sector.

The Λ(1405) can be produced in the reaction γ p → K⁺ Λ(1405). One decay mode is into Σ⁰π⁰, which is prohibited for the mass-overlapping Σ(1385). A similar reaction to reconstruct is γ p → K⁺ Σ⁰, which yields one less pion in the final state. BGO-OD is ideally suited to measure both reactions and preliminary results will be presented.

*Supported by DFG (SFB/TR-16).