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arXiv · 2607.28612

Extraction of $\sigma_{TT}$ for Proton, Neutron, Deuteron and $^3$He from Quasi-real Photon Scattering

YiLei Li·B. Callahan·M. M. Dalton·A. Deur·O. Larson·A. Rask·D. W. Upton·X. Zheng
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Abstract

We report on an extraction of the polarized photoproduction cross-section for the proton, deuteron, neutron and $^3$He, obtained by extrapolating electron scattering data to the real photon point. The data are from the Jefferson Lab E97-110 ($^3$He) and CLAS EG4 (proton and deuteron) experiments. Information on the neutron is extracted from the deuteron or $^3$He data using the weak binding approximation. Comparing with data obtained with real photons, we find that while the proton results agree, our results on the deuteron and the neutron exhibit a larger strength in the $\Delta(1232)$ region, and are more consistent with isospin symmetry when compared with the proton results.

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YiLei Li, B. Callahan, M. M. Dalton, A. Deur, O. Larson, A. Rask, D. W. Upton, X. Zheng. 2026-07-30. Extraction of $\sigma_{TT}$ for Proton, Neutron, Deuteron and $^3$He from Quasi-real Photon Scattering. https://arxiv.org/abs/2607.28612

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