Observation of large missing-momentum (𝑒,𝑒′⁒𝑝) cross-section scaling and the onset of correlated-pair dominance in nuclei

DOI

10.1103/PhysRevC.107.L061301

Abstract

We report the measurement of xB scaling in (e, eβ€² p) cross-section ratios off nuclei relative to deuterium at large missing momentum of 350 pmiss 600 MeV/c. The observed scaling extends over a kinematic range of 0.7 xB 1.8, which is significantly wider than 1.4 xB 1.8 previously observed for inclusive (e, eβ€² ) cross-section ratios. The xB -integrated cross-section ratios become constant (i.e., scale) beginning at pmiss β‰ˆ kF , the nuclear Fermi momentum. Comparing with theoretical calculations we find good agreement with generalized contact formalism calculations for high missing momentum (>375 MeV/c), suggesting the observed scaling results from interacting with nucleons in short-range correlated (SRC) pairs. For low missing momenta, mean- field calculations show good agreement with the data for pmiss < kF , and suggest a potential non-negligible contribution to the measured cross-section ratios from scattering off single, uncorrelated, nucleons up to pmiss β‰ˆ 350 MeV/c. Therefore, SRCs become dominant in nuclei at pmiss β‰ˆ 350 MeV/c, well above the nuclear Fermi SurfaceofkF β‰ˆ250MeV/c.

Document Type

Article

Publication Date

5-26-2023

Publisher Statement

Β©2023 American Physical Society

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