论文标题
阈值暂停触发电源和光生源在协变性手性扰动理论中的核子
Threshold pion electro- and photoproduction off nucleons in covariant chiral perturbation theory
论文作者
论文摘要
在扩展的质量壳方案中，在o（$ p^3 $）的协方差手性扰动理论中研究了接近阈值的核和光生成，并在明显纳入$δ（1232）$ resonance中。相关的低能常数是通过将可用的实验数据与理论模型拟合的。将$δ$共振作为显式自由度的包含大大改善了与数据的协议和模型的收敛性。
Pion electro- and photoproduction off the nucleon close to threshold is studied in covariant baryon chiral perturbation theory at O($p^3$) in the extended-on-mass-shell scheme, with the explicit inclusion of the $Δ(1232)$ resonance. The relevant low energy constants are fixed by fitting the available experimental data with the theoretical model. The inclusion of the $Δ$ resonance as an explicit degree of freedom substantially improves the agreement with data and the convergence of the model.
