2022/08/26 by Gerald A. Miller, Miller, Gerald A. · 1 voice
Physics and Astronomy · #FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #Nuclear physics research studies #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-ex #nucl-th
paper · pdf · doi:10.48550/arxiv.2208.12873
16 pages, 7 figures, prepared as a chapter of the book "75 Years of Pion" edited by Igor Strakovsky, Alexey Petrov, and Nicolai Popov. arXiv admin note: text overlap with arXiv:2205.01108, arXiv:0907.4569, arXiv:2111.09849 by other authors. Those authors are cited. This version has several improvements
openalex publication_date 2022/08/26 · arxiv created 2022/09/06 · arxiv updated 2022/09/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A historical review of pion-nucleon interactions at low energy is presented, with aims toward an introductory, pedagogic approach focusing on issues germane to current research. These topics include the use of chiral effective field theory, the sigma term, qualitative understanding of low-energy phase shifts, the physics of the Δ resonance, and isospin violation. A theme is that low-energy pion-nucleon scattering is directly related to QCD via effective field theory. Another theme is that modern needs regarding the pion-nucleon sigma term and the study of isospin violation requires a better low-energy data set.