Target normal single-spin asymmetry in inclusive electron-nucleon scattering with two-photon exchange: Analysis using 1/N expansion
Target normal single-spin asymmetry in inclusive electron-nucleon scattering with two-photon exchange: Analysis using 1/N expansion
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DOI：
10.1016/j.physletb.2022.137580
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发表时间：
2022-07
影响因子：
4.4
通讯作者：
J. Goity;Christof Weiss;C. Willemyns
中科院分区：
文献类型：
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作者：
J. Goity;Christof Weiss;C. Willemyns
本文计算了共振区电子-核子包容散射中由双光子交换引起的目标单自旋不对称性。我们的分析使用了低能QCD的1/Nc展开，并使用压缩的SU（4）自旋-味道对称性将N和Δ中间态和末态结合起来。在1/N c的首阶精度下获得的正常自旋不对称性的大小为10− 2，在ep和en散射中的符号不同。它可以在实验室能量为0.5-1.5 GeV的电子散射中测量，并提供了双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∼ 10− 2 and different sign in ep and en scattering. It can be measured in electron scattering at lab energies∼ 0.5–1.5 GeV and provides a clean probe of two-photon exchange dynamics.