Target normal single-spin asymmetry in inclusive electron-nucleon scattering in the 1/Nc expansion
Abstract
The target normal single-spin asymmetry in inclusive electron-nucleon scattering is studied in the low-energy regime that includes the resonance. The particular interest in the asymmetry resides in that it is driven by two-photon exchange effects. It probes the spin-dependent absorptive part of the two-photon exchange amplitude, which is free of infrared and collinear singularities and represents the most pristine expression of two-photon exchange dynamics. The study presented here uses the 1/Nc expansion of QCD, which combines the and through the emergent SU(4) spin-flavor symmetry in the baryon sector and allows for a systematic construction of the transition EM currents. The analysis includes the first subleading corrections in the 1/Nc expansion and presents results for elastic and inelastic final states. The asymmetry is found to be in the range . The resonance plays an important role as an intermediate state in the elastic asymmetry and as a final state in the inclusive asymmetry.
Keywords
Cite
@article{arxiv.2303.12681,
title = {Target normal single-spin asymmetry in inclusive electron-nucleon scattering in the 1/Nc expansion},
author = {Jose L. Goity and Christian Weiss and Cintia Willemyns},
journal= {arXiv preprint arXiv:2303.12681},
year = {2023}
}