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;

D O I：

暂无

中图分类号：

学科分类号：

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.

引用

页码：209 / 216

页数：7

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