Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 66: Invited Talks V

HK 66.1: Hauptvortrag

Freitag, 3. April 2020, 14:30–15:00, H-HS X

Baryon Spectroscopy with the CBELSA/TAPS experiment at ELSA — •Annika Thiel for the CBELSA/TAPS collaboration — Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn

The dynamics of the quarks and gluons inside the nucleon are a long-standing question in hadron physics. To shed more light on this topic, the excitation spectrum of the nucleons needs to be measured and compared to theoretical models like constituent quark models or lattice QCD calculations. Until now, most of the predicted resonances - especially at high masses - have not been found by experiments, which are the well-known "missing resonances". The missing resonances problem is a recent research project by several different experiments. One of them is the CBELSA/TAPS experiment, which is located at the ELSA accelerator in Bonn. This experiment features a detector system with nearly full 4π angular coverage and a high detection efficiency for photons, which makes it the ideal tool for the measurement of final states comprising neutral mesons. One of its features is the use of linearly or circularly polarized photon beams impinging on a longitudinally or transversely polarized butanol target. This allows for the measurement of single or double polarization observables, which are of major importance in the identification of weak resonance contributions.

In this talk, an overview of the recent status in baryon spectroscopy at the CBELSA/TAPS experiment will be given, which includes the measurement of different polarization observables and a review of their impact on the excitation spectra of the nucleons. Supported by the DFG (SFB/TR16).