论文标题
带有两光子交换的包含电子核子散射中的正常单旋不对称：使用$ 1/n_c $扩展分析
Target normal single-spin asymmetry in inclusive electron-nucleon scattering with two-photon exchange: Analysis using $1/N_c$ expansion
论文作者
论文摘要
我们计算谐振区域中包含电子核子散射中的两光子交换引起的目标正常单旋不对称。我们的分析使用低能QCD的$ 1/n_c $扩展，并结合了$ n $和$δ$中级和最终状态，并使用合同的$ su（4）$ spin-flavory对称性。 $ 1/n_c $以$ 1/n_c $以$ \ sim 10^{ - 2} $和$ ep $ $ ep $和$ en $散射中的不同符号的量级$ \ sim 10^{ - 2}获得的正常旋转不对称性。它可以在实验室能量的电子散射中进行测量$ \ sim $ 0.5-1.5 GEV，并提供了两光子交换动力学的干净探针。
We calculate the target normal single-spin asymmetry caused by two-photon exchange in inclusive electron-nucleon scattering in the resonance region. Our analysis uses the $1/N_c$ expansion of low-energy QCD and combines $N$ and $Δ$ intermediate and final states using the contracted $SU(4)$ spin-flavor symmetry. The normal spin asymmetry obtained in leading-order accuracy in $1/N_c$ has magnitude $\sim 10^{-2}$ and different sign in $ep$ and $en$ scattering. It can be measured in electron scattering at lab energies $\sim$ 0.5-1.5 GeV and provides a clean probe of two-photon exchange dynamics.
