Pion photoproduction off the proton in a gauge-invariant chiral unitary framework

被引：49

作者：

Mai, Maxim ^{[1
,2
]}

Bruns, Peter C. ^{[3
]}

Meissner, Ulf-G. ^{[1
,2
,4
,5
]}

机构：

[1] Univ Bonn, Helmholtz Inst Strahlen & Kernphys Theorie, D-53115 Bonn, Germany

[2] Univ Bonn, Bethe Ctr Theoret Phys, D-53115 Bonn, Germany

[3] Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany

[4] Forschungszentrum Julich, Inst Kernphys, Inst Adv Simulat, D-52425 Julich, Germany

[5] Forschungszentrum Julich, Julich Ctr Hadron Phys, D-52425 Julich, Germany

来源：

PHYSICAL REVIEW D | 2012年 / 86卷 / 09期

关键词：

NUCLEON INTERACTIONS; BETHE-SALPETER; MESON; DYNAMICS; SCATTERING; ELECTROPRODUCTION; N-ASTERISK(1535); RESONANCES; AMPLITUDE; MODEL;

D O I：

10.1103/PhysRevD.86.094033

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate pion photoproduction off the proton in a manifestly gauge-invariant chiral unitary extension of chiral perturbation theory. In a first step, we consider meson-baryon scattering taking into account all next-to-leading order contact interactions. The resulting low-energy constants are determined by a fit to s-wave pion-nucleon scattering and the low-energy data for the reaction pi(-) p -> eta n To assess the theoretical uncertainty, we perform two different fit strategies. Having determined the low-energy constants, we then analyze the data on the s-wave multipole amplitudes E0+ of pion and eta photoproduction. These are parameter-free predictions, as the two new low-energy constants are determined by the neutron and proton magnetic moments.

引用

页数：22

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