The paper derives a manifestly gauge-invariant decomposition of the two-photon-exchange hadronic tensor in the zero-recoil limit, enabling gauge-invariant closure and density-only approximations.
]µν+Sµν term begins atO(1/M) and depends only on⟨Sµν⟩
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Manifest Gauge Invariance for Structure Dependent Radiative Corrections to Processes Involving Atoms and Nuclei
The paper derives a manifestly gauge-invariant decomposition of the two-photon-exchange hadronic tensor in the zero-recoil limit, enabling gauge-invariant closure and density-only approximations.