论文标题
大$ n_c $在无效的磁场理论中的磁性和轴向两核电电流分析
Large-$N_c$ analysis of magnetic and axial two-nucleon currents in pionless effective field theory
论文作者
论文摘要
我们在合并的大$ N_C $中分析了磁性和轴向两核接触项，并分析了无效的现场理论扩展。这些术语在正确描述辐射中子捕获的低能横截面和Deuteron磁矩时起着重要作用。我们表明，大型$ N_C $扩展暗示了与现象学拟合中发现的两个领先磁性项之间的层次结构。我们还评论不同拉格朗日基地的自然问题。
We analyze magnetic and axial two-nucleon contact terms in a combined large-$N_c$ and pionless effective field theory expansion. These terms play important roles in correctly describing, e.g., the low-energy cross section of radiative neutron capture and the deuteron magnetic moment. We show that the large-$N_c$ expansion hints towards a hierarchy between the two leading-order magnetic terms that matches that found in phenomenological fits. We also comment on the issue of naturalness in different Lagrangian bases.
