Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 15: Hadron Structure and Spectroscopy I

HK 15.4: Talk

Tuesday, March 11, 2025, 15:00–15:15, HS 3 Physik

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

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 on reaction identification and progress towards the determination of the γ p → η^′ p beam asymmetry will be presented.

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

Keywords: BGOOD; Photoproduction