Pion photoproduction in a dynamical coupled-channels model
Pion photoproduction in a dynamical coupled-channels model
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DOI：
10.1103/physrevc.85.054003
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发表时间：
2011-10
影响因子：
3.1
通讯作者：
F. Huang;M. Döring;H. Haberzettl;J. Haidenbauer;C. Hanhart;S. Krewald;Ulf-G. Meissner;K. Nakayama-K.
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文献类型：
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作者：
F. Huang;M. Döring;H. Haberzettl;J. Haidenbauer;C. Hanhart;S. Krewald;Ulf-G. Meissner;K. Nakayama-K.
基于Haberzettl，Huang和Nakayama的公式[Phys.Rev.C83，065502（2011）]，在动态耦合通道方法中研究了带电和中性π介子光生反应。强子末态相互作用由Juelich pi-N模型提供，该模型包括由稳定强子组成的通道pi-N和eta-N以及有效的pi-pi-N通道pi-Delta、sigma-N和rho-N。这个强子模型在描述质心能量高达1.9 GeV的π-N到π-N散射方面已经相当成功。通过构造，全π介子光生电流满足广义沃德-高桥恒等式，因此是规范不变的。计算了γ p到pi+ n、γ p到pi 0 p、γ n到pi- p和γ n到pi 0 n反应的微分截面和光子自旋不对称性，在质心能量为1.65 GeV时，与实验数据符合得很好.
The charged and neutral pion photoproduction reactions are investigated in a dynamical coupled-channels approach based on the formulation of Haberzettl, Huang, and Nakayama [Phys. Rev. C 83, 065502 (2011)]. The hadronic final-state interaction is provided by the Juelich pi-N model, which includes the channels pi-N and eta-N comprising stable hadrons as well as the effective pi-pi-N channels pi-Delta, sigma-N, and rho-N. This hadronic model has been quite successful in describing pi-N to pi-N scattering for center-of-mass energies up to 1.9 GeV. By construction, the full pion photoproduction current satisfies the generalized Ward-Takahashi identity and thus is gauge invariant as a matter of course. The calculated differential cross sections and photon spin asymmetries up to 1.65 GeV center-of-mass energy for the reactions gamma p to pi+ n, gamma p to pi0 p, gamma n to pi- p and gamma n to pi0 n are in good agreement with the experimental data.