Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 18: Hadron Structure and Spectroscopy II

HK 18.3: Talk

Tuesday, March 11, 2025, 16:30–16:45, HS 3 Physik

Determination of Polarization Observables in the π⁰ η-Photoproduction off the Neutron — •Leoniedas Reschke for the CBELSA/TAPS collaboration — Helmholtz-Institut für Strahlen- und Kernphysik, Nussallee 14-16, 53115 Bonn

The extraction of double-meson polarization observables from neutron reactions provides a valuable opportunity to refine theoretical models and to compare production processes off neutrons with those off protons. Measurements of polarization observables off neutrons offer access to resonances which couple stronger to the neutron, making them essential for a comprehensive understanding of nucleon resonances. Final states involving two mesons are particularly sensitive to cascading decays via intermediate states, providing unique insights into baryon dynamics. However, data on neutron, and, especially, double meson-neutron reactions are scarce. At the CBELSA/TAPS experiment in Bonn, photoproduction experiments are conducted using a polarized photon beam and various targets, including a polarized deuterized butanol target. This setup enables photoproduction experiments off the neutron. Since only deuteron-bound neutrons can be polarized, but reactions from all target neutrons are measured, advanced analysis techniques are necessary to exclude contamination from the neutrons bound in oxygen and carbon while also accounting for the Fermi motion of the bound neutrons in the deuteron. In this talk, I will present preliminary results for polarization observables in γ n → n π⁰ η. Supported by the DFG (Project-Nr.: 505387544).

Keywords: photoproduction; neutron; eta; pi; CBELSA/TAPS