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Existence of nuclear modifications on longitudinal-transverse structure function ratio
S. Kumano
https://arxiv.org/abs/2506.18305 https://

Existence of nuclear modifications on longitudinal-transverse structure function ratio
It has been assumed that nuclear modification does not exist in the longitudinal-transverse structure function ratio $R_N=F_L^N/(2xF_1^N)$ in lepton deep inelastic scattering. This assumption is widely used in obtaining structure functions of the ``nucleon" from nuclear data such as the deuteron ones. However, nuclear modifications do exist theoretically at least at medium- and large-$x$ regions because nucleons in a nucleus move in any direction, which is not necessary the longitudinal directi…