Two-photon Exchange Corrections to Single Spin Asymmetry of Neutron and ${}^3$He

Abstract

In a simple hadronic model, the two-photon exchange contributions to the single spin asymmetries for the nucleon and the ${}^3$He are estimated. The results show that the elastic contributions of two-photon exchange to the the single spin asymmetries for the nucleon are rather small while those for the ${}^3$He are relatively large. Besides the strong angular dependence, the two-photon contributions to the single spin asymmetry for the ${}^3$He are very sensitive to the momentum transfer.

Comments: 11 pages, 8 figures