Erlangen 2026 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 38: Hadron Structure and Spectroscopy VIII

HK 38.2: Talk

Thursday, March 19, 2026, 16:45–17:00, PHIL A 401

η′ beam asymmetry at threshold using the BGOOD experiment — •Leoni Lutter for the BGOOD collaboration — Physikalisches Institut

The unexpected nodal structure of the beam asymmetry reported by the GRAAL collaboration in η′ photoproduction very close to threshold could be explained by a previously unobserved very narrow resonance. BGOOD is one of the few experiments worldwide which is able to verify this result. The experiment is composed of a central calorimeter for neutral meson decays and a forward spectrometer for charged particle identification. Close to threshold the γ p → η′ p reaction can be reconstructed over all centre-of-mass angles from proton identification at forward angles. A linearly polarised photon beam produced via coherent bremsstrahlung off a diamond radiator makes it possible to measure the η′ beam asymmetry. Preliminary results of the γ p → η′ p beam asymmetry will be presented.

Keywords: BGOOD; Photoproduction