Chiral Dynamics in Photopion Physics: Theory, Experiment, and Future Studies at the HIγS Facility
| العنوان: | Chiral Dynamics in Photopion Physics: Theory, Experiment, and Future Studies at the HIγS Facility |
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| المؤلفون: | Ying Wu, H. R. Weller, Mohammad Ahmed, S. Stave, Aron M. Bernstein |
| المصدر: | Annual Review of Nuclear and Particle Science. 59:115-144 |
| بيانات النشر: | Annual Reviews, 2009. |
| سنة النشر: | 2009 |
| مصطلحات موضوعية: | Quantum chromodynamics, Physics, Quark, Nuclear and High Energy Physics, Particle physics, Chiral perturbation theory, Nuclear Theory, Field (physics), High Energy Physics::Lattice, High Energy Physics - Experiment, Pion, Isospin, Sensitivity (control systems), Nucleon, Nuclear Experiment |
| الوصف: | A review of photo-pion experiments on the nucleon in the near threshold region is presented. Comparisons of the results are made with the predictions of the low energy theorems of QCD calculated using chiral perturbation theory (ChPT) which is based on the spontaneous breaking of chiral symmetry as well as its explicit breaking due to the finite quark masses. As a result of the vanishing of the threshold amplitudes in the chiral limit, the experiments are difficult since the cross sections are small. Nevertheless the field has been brought to a mature stage of accuracy and sensitivity. The accomplishments and limitations of past experiments are discussed. Future planned experiments at Mainz and HI$\gamma$S using polarization observables are discussed as a more rigorous test of theoretical calculations. Emphasis is given to the technical developments that are required for the HI$\gamma$S facility. It is shown that future experiments will provide more accurate tests of ChPT and will be sensitive to isospin breaking dynamics due to the mass difference of the up and down quarks. Comment: 61 pages, 10 figures, 2 tables |
| تدمد: | 1545-4134 0163-8998 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9e62cf7912d90ce60cafc34396ce5976Test https://doi.org/10.1146/annurev.nucl.010909.083220Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....9e62cf7912d90ce60cafc34396ce5976 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15454134 01638998 |
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