Köln 2025 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 18: Hadron Structure and Spectroscopy II

HK 18.2: Vortrag

Dienstag, 11. März 2025, 16:15–16:30, HS 3 Physik

Determination of polarization observables in the reaction γn→nπ⁰ π⁰. — •Nadia Reinartz for the CBELSA/TAPS collaboration — Helmholtz-Institut für Strahlen- und Kernphysik, Nussallee 14-16, 53115 Bonn

Investigating the baryon excitation spectrum is essential for understanding the internal dynamics of baryons and quantum chromodynamics (QCD) in the non-perturbative regime. Extracting the baryon resonances and their properties from the data is difficult due to the short lifetime of these exited states which leads to broad and strongly overlapping resonances. Using a polarized beam, a polarized target or using the polarization of the recoiling nucleon allows the measurement of single or double polarization observables, that are needed for an unambiguous partial wave analysis solution.

The CBELSA/TAPS experiment uses polarized photons of up to 3.2 GeV energy and a polarized target to determine single or double polarization observables for various final states. The Crystal Barrel calorimeter in combination with the MiniTAPS calorimeter in forward direction and the ability to detect charged particles, allows measurements in a close to 4π coverage. In the last years, the CBELSA/TAPS experiment in Bonn was upgraded in order to significantly boost the efficiency to trigger on final states with only neutral particles.

In this talk a comparison between results of free and quasi-free protons in the reaction γp→pπ⁰π⁰ are discussed, followed by preliminary results for the reaction γn→nπ⁰π⁰.

Supported by the DFG (505387544)