EPJ A Highlight - Photocouplings at the Pole from Pion Photoproduction

Тelected fit results for the beam asymmetry Σ (left) and the double polarization E (right)

While the strong force is well understood at high energies in terms of perturbative QCD, the precise mechanism responsible for the confinement of quarks and gluons in color-neutral hadrons at low energies remains a mystery to date. The intermediate energy region is characterized by rich and complex spectra of excited baryons and mesons. Its phenomenology provides a key to our understanding of the fundamental properties of matter.

This theoretical interest has triggered large-scale experimental programs. Extracting the spectrum of baryon resonances from experimental data is a theoretical challenge, since the resonances are unstable and exhibit different decay patterns into different final states. Moreover, many resonances are broad and overlap in energy. Accordingly, a global multi-channel partial-wave analysis is required.

To this purpose, a theoretical model of meson-baryon interactions has been developed and resonance parameters were determined in the analysis of the reactions πN→πN, πN→ηN, πN→KΛ and πN→KΣ.

The present paper extends this analysis to single pion-photoproduction data - including over 20,000 measurements of cross sections and single- and double-polarization observables - from which the electromagnetic resonance properties are then extracted.

Photocouplings at the pole from pion photoproduction, D. Rönchen et al. (2014), European Physical Journal A 50: 101, DOI 10.1140/epja/i2014-14101-3

This was our first experience of publishing with EPJ Web of Conferences. We contacted the publisher in the middle of September, just one month prior to the Conference, but everything went through smoothly. We have had published MNPS Proceedings with different publishers in the past, and would like to tell that the EPJ Web of Conferences team was probably the best, very quick, helpful and interactive. Typically, we were getting responses from EPJ Web of Conferences team within less than an hour and have had help at every production stage.
We are very thankful to Solange Guenot, Web of Conferences Publishing Editor, and Isabelle Houlbert, Web of Conferences Production Editor, for their support. These ladies are top-level professionals, who made a great contribution to the success of this issue. We are fully satisfied with the publication of the Conference Proceedings and are looking forward to further cooperation. The publication was very fast, easy and of high quality. My colleagues and I strongly recommend EPJ Web of Conferences to anyone, who is interested in quick high-quality publication of conference proceedings.

On behalf of the Organizing and Program Committees and Editorial Team of MNPS-2019, Dr. Alexey B. Nadykto, Moscow State Technological University “STANKIN”, Moscow, Russia. EPJ Web of Conferences vol. 224 (2019)

ISSN: 2100-014X (Electronic Edition)

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