Aspects of near-threshold neutral pion photoproduction off protons

被引：0
|
作者：
V. Bernard
N. Kaiser
U.-G. Meißner
机构：
[1] Université Louis Pasteur,
[2] Laboratoire de Physique Théorique 3-5,undefined
[3] rue de l'Université,undefined
[4] F-67084 Strasbourg,undefined
[5] France,undefined
[6] Technische Universität München,undefined
[7] Physik Department T39 James-Franck-Straße,undefined
[8] D-85747 Garching,undefined
[9] Germany,undefined
[10] Forschungszentrum Jülich,undefined
[11] Institut für Kernphysik (Theorie),undefined
[12] D-52425 Jülich,undefined
[13] Germany,undefined
来源：
The European Physical Journal A - Hadrons and Nuclei | 2001年 / 11卷
关键词：
PACS. 12.20.Ds Specific calculations – 12.39.Fe Chiral Lagrangians – 25.20.Lj Photoproduction reactions;
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摘要：
We investigate near-threshold neutral pion photoproduction off protons to fourth order in heavy-baryon chiral perturbation theory in the light of the new data from MAMI. We show that the unitarity cusp at the secondary π+n threshold is in agreement with expectations from the final-state theorem. We also analyze the fourth-order corrections to the P-wave low-energy theorems and show that potentially large Δ isobar contributions are cancelled by sizeable pion loop effects. This solidifies the parameter-free third-order predictions, which are in good agreement with the data.
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页码：209 / 216
页数：7
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