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arXiv · 2608.31044

Electromagnetic responses induced by one- and two-body nuclear currents in inclusive electron-nucleus scattering

Kajetan Niewczas·Ashish Kumar Jha·Raúl González-Jiménez·Natalie Jachowicz·Alexis Nikolakopoulos·Jan Ryckebusch
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Abstract

The longitudinal and transverse nuclear response functions encode information about the electromagnetic behavior of the nuclear target probed in inclusive electron-nucleus scattering. We present a microscopic calculation based on an independent-particle model, where a non-relativistic nuclear mean-field potential governs both the initial and final hadronic states of the interaction. We add dynamically generated short-range nucleon-nucleon correlations (SRCs), as well as meson-exchange currents (MECs) derived from one-pion exchange and intermediate $\Delta$-resonance excitation. We evaluate the contributions from one- and two-nucleon knock-out reactions to nuclear responses in inclusive electron scattering from $^{12}\mathrm{C}$ in the quasielastic and dip regions. We demonstrate that for quasielastic kinematics, SRCs quench both nuclear responses, while the MECs enhance the transverse signal, substantially improving the predicted transverse-to-longitudinal ratio. In the dip region between the quasielastic and the $\Delta$-resonance peaks, we find that the observed excess of transverse strength originates mainly from explicit two-nucleon knock-out following a $\Delta$-resonance excitation.

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Kajetan Niewczas, Ashish Kumar Jha, Raúl González-Jiménez, Natalie Jachowicz, Alexis Nikolakopoulos, Jan Ryckebusch. 2026-08-31. Electromagnetic responses induced by one- and two-body nuclear currents in inclusive electron-nucleus scattering. https://arxiv.org/abs/2608.31044

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