Abstract
The quest to understand the physics of any system cannot be said to be complete as long as one cannot predict and fully understand its resonance spectrum. Despite this, due to the experimental challenge of the required double polarization measurements and the difficulty in achieving unambiguous, model-independent extraction and interpretation of the nucleon resonance spectrum of many broad and overlapping resonances, understanding of the structure and dynamics of the nucleon has suffered. The recent improvement in statistical quality and kinematic range of the data made available by such full-solid-angle systems as the CB and TAPS constellation at MAMI, coupled with the high flux polarized photon beam provided by the Glasgow Photon Tagger, and the excellent properties of the Mainz Frozen Spin Target, when paired with new developments in Partial Wave Analysis (PWA) methodology make this a very exciting and fruitful time in nucleon resonance studies. Here the recent influx of data and PWA developments are summarized, and the requirements for a complete, unambiguous PWA solution over the first and second resonance region are briefly reviewed.
Highlights
The nucleon resonance spectrum could be argued to be one of the most fundamental properties of the nucleon
The recent improvement in statistical quality and kinematic range of the data made available by such full-solid-angle systems as the Crystal Ball (CB) and TAPS constellation at MAMI, coupled with the high flux polarized photon beam provided by the Glasgow Photon Tagger, and the excellent properties of the Mainz Frozen Spin Target, when paired with new developments in Partial Wave Analysis (PWA) methodology make this a very exciting and fruitful time in nucleon resonance studies
We describe the progress of these measurements and the state-of-the-art partial wave analyses, and look at the future outlook for baryon resonance studies in Mainz and in the wider field
Summary
The nucleon resonance spectrum could be argued to be one of the most fundamental properties of the nucleon. The data we have measured are insufficient in number and not accurate enough to fully constrain Partial Wave Analyses, so there remain multiple solutions to the decomposition of the spectrum. EPJ Web of Conferences and double meson photoproduction They are working in close collaboration with the theory group in Mainz to further develop partial wave analysis techniques and make targeted measurements, designed to address several issues in existing data set and analyses. We describe the progress of these measurements and the state-of-the-art partial wave analyses, and look at the future outlook for baryon resonance studies in Mainz and in the wider field
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