Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 22: Hadron Structure and Spectroscopy V

HK 22.2: Talk

Wednesday, April 1, 2020, 14:30–14:45, J-HS A

η′ beam asymmetry at threshold using the BGO-OD experiment — •Stefan Alef for the BGO-OD collaboration — Physikalisches Institut Universität Bonn

The unexpected nodal structure of the beam asymmetry recently reported by the GRAAL collaboration in η′ photoproduction very close to threshold could be explained by a previously unobserved very narrow resonance. Therefore, the measurement is important to be independently confirmed.
This possibility is offered by the BGO-OD experiment. It is well suited for the detection of forward going charged particles which in the threshold region of interest allows the identification of the reaction γ p → η′ p solely based on the proton going in forward direction. This yields unprecedented statistics if in the missing mass analysis of the η′ meson the background can be sufficiently well controlled. A linearly polarized photon beam produced via coherent bremsstrahlung off a diamond radiator makes it possible to measure the η′ beam asymmetry.
In this talk I will present preliminary results on the determination of the η′ beam asymmetry close to threshold.
Supported by DFG (PN 50165297).