Köln 2025 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 15: Hadron Structure and Spectroscopy I

HK 15.2: Vortrag

Dienstag, 11. März 2025, 14:30–14:45, HS 3 Physik

Determination of polarization observables in the reaction γp → pω — •Lisa Richter for the CBELSA/TAPS collaboration — Universität Bonn

Nucleons are bound states composed of quarks and gluons. They interact via the strong interaction, which is described by quantum chromodynamics (QCD). The non-pertubative regime of the QCD is not well understood.

One way of deepening the understanding of this regime is the study of baryon excitation spectrum. The spectrum can be obtained in photoproduction experiments, where single and double polarization observables can be measured using a polarized photon beam and target.

The CBELSA/TAPS experiment in Bonn utilizes a linearly or circularly polarized photon beam impinging on a longitudinally or transversally polarized target. As a result, it is possible to get information on single and double polarization observables for different final states.

The main detector system consists of the Crystal Barrel (CB) and the MiniTAPS calorimeter. With this system, it is possible to cover a solid angle of almost 4π with high efficiency for the detection of photons. For the identification of charged particles, an inner detector is located inside of the Crystal Barrel detector.

The reaction γp → pω allows the investigation of a non-pionic final state, which could help to get a better understanding of baryon resonances.

This talk gives an insight into possible background reactions and presents my first results of observables for ω photoproduction.

Keywords: CBELSA/TAPS; polarizations observables; omega photoproduction