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HK: Fachverband Physik der Hadronen und Kerne

HK 12: Invited Talks II

HK 12.1: Invited Talk

Tuesday, March 21, 2023, 11:00–11:30, HSZ/0002

Baryon spectroscopy at ELSA and MAMI — •Farah Afzal for the CBELSA/TAPS collaboration — HISKP, Uni Bonn

To improve our knowledge of the exact dynamics between the constituents of baryons and to better understand quantum chromodynamics (QCD) in the non-perturbative regime, the baryon excitation spectrum is investigated.

Experimentally, it can be probed with a real photon beam by studying photoproduction reactions. Partial wave analyses are performed to extract the baryon resonance parameters from the experimental data. For an unambiguous solution it is not enough to only measure the unpolarized cross section, but several single and carefully chosen double polarization observables are essential as well.

Worldwide, various experimental facilities have dedicated programs to measure these polarization observables in different photoproduction reactions using polarized photon beams and polarized targets. Two of the leading experimental facilities are located in Germany, the CBELSA/TAPS experiment at the accelerator facility ELSA in Bonn and the Crystal Ball experiment at the accelerator facility MAMI in Mainz. Both experiments are excellent at measuring neutral mesons in the final states, using electromagnetic calorimeters covering almost the full angular range, while exploring complementary beam energy regions. This talk will give an overview about recent results in non-strange baryon spectroscopy at ELSA and MAMI.