标题： 具有形式因子的K介子光致产生：规范不变方法 显示英文标题

标题： Kaon photoproduction with form factors in a gauge-invariant approach

摘要： Haberzettl 给出的通用规范不变光致产生形式被应用于核子的 kaon 光致产生，其中使用了描述复合核子的形式因子。 我们证明，与大塚的规范不变性方案相比，此形式允许电荷流贡献乘以一个形式因子，即它们不需要像裸电流那样处理。 数值结果显示，与大塚的方法相比，Haberzettl 的规范程序显著改善了$\chi^2$值。 此外，还给出了对波恩 SAPHIR 新数据的$p(\gamma,K^+)\Lambda$预测。 显示英文摘要

摘要： The general gauge-invariant photoproduction formalism given by Haberzettl is applied to kaon photoproduction off the nucleon at the tree level, with form factors describing composite nucleons. We demonstrate that, in contrast to Ohta's gauge-invariance prescription, this formalism allows electric current contributions to be multiplied by a form factor, i.e., they do not need to be treated like bare currents. Numerical results show that Haberzettl's gauge procedure, when compared to Ohta's, leads to much improved $\chi^2$ values. Moreover, predictions for the new Bonn SAPHIR data for $p(\gamma,K^+)\Lambda$ are given.