On the Cancellation of Nuclear Effects in the Valence Region

2026/04/30 by S. A. Kulagin, R. Petti
Physics and Astronomy · #nucl-th #hep-ex #hep-ph #nucl-ex

paper · pdf

17 pages, 7 figures, 2 tables

arxiv created 2026/08/03 · arxiv updated 2026/08/05

Abstract

Deep-inelastic e/μ scattering data on targets ranging from deuterium to lead indicate that nuclear modifications to the structure functions of bound nucleons are minimal in the kinematic region where valence quark distributions peak. A global analysis of measurements of the isoscalar cross-section ratios σ^A/σ^²H in the range 0.25 ≤ x ≤ 0.35 reveals a remarkable cancellation of nuclear effects across all nuclei, yielding a mean value of 0.9988 ± 0.0023. We discuss these results and explore potential interpretations within a microscopic model for the nuclear modifications of the structure functions.

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