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Two-photon Exchange Corrections to Single Spin Asymmetry of Neutron and He
In a simple hadronic model, the two-photon exchange contributions to the
single spin asymmetries for the nucleon and the 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
He are relatively large. Besides the strong angular dependence, the
two-photon contributions to the single spin asymmetry for the He are very
sensitive to the momentum transfer.Comment: 11 pages, 8 figure
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