München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 47: Hadron Structure and Spectroscopy VII

HK 47.4: Talk

Thursday, March 21, 2019, 15:00–15:15, HS 13

Truncated partial wave analysis (TPWA) of the reactions γ p → π⁰ p and γ p → η p — •Philipp Krönert¹, Yannick Wunderlich¹, Farah Afzal¹, Annika Thiel², and Reinhard Beck¹ for the CBELSA/TAPS collaboration — ¹Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn — ²School of Physics & Astronomy, University of Glasgow

According to the current scientific knowledge, quarks are the fundamental components of the nucleon. Their interaction is described theoretically by quantum chromodynamics. The study of the excitation spectrum of the nucleon can validate and improve the understanding of the underlying theory.
A possible mechanism for the excitation of nucleon resonances is the photoproduction of mesons. The reaction of pseudoscalar meson photoproduction γ N → ϕ N in particular allows for the extraction of 16 polarization observables.
An introduction to a model-independent analysis scheme will be given in the talk, namely the technique of truncated partial wave analysis. This permits the study of different contributions from partial waves to the full reaction amplitude via so-called moment analysis. Furthermore, attempts can be made to extract partial waves, up to one overall phase, from polarisation data at single energies.

Preliminary results for the photoproduction reactions γ p → π⁰ p and γ p → η p will be shown.