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

CLAS Collaboration

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We report the measurement of xB scaling in (e,e′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,e′) cross-section ratios. The xB-integrated cross-section ratios become constant (i.e., scale) beginning at pmiss≈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≈350 MeV/c. Therefore, SRCs become dominant in nuclei at pmiss≈350 MeV/c, well above the nuclear Fermi Surface of kF≈250 MeV/c.

Original languageEnglish
Article numberL061301
Number of pages7
JournalPhysical Review C
Issue number6
Publication statusPublished - 6 Jun 2023

Bibliographical note

Funding Information:
We acknowledge the efforts of the staff of the Accelerator and Physics Divisions at Jefferson Laboratory that made this experiment possible. The analysis presented here was carried out as part of the Jefferson Lab Hall B data-mining project supported by the U.S. Department of Energy (DOE). The research was also supported by the National Science Foundation, the Israel Science Foundation, the Pazi Foundation, the Chilean Comisión Nacional de Investigación Científica y Tecnológica, the French Centre National de la Recherche Scientifique and Commissariat a l'Energie Atomique, the FrenchAmerican Cultural Exchange, the Italian Istituto Nazionale di Fisica Nucleare, the National Research Foundation of Korea, and the UK Science and Technology Facilities Council. Jefferson Science Associates operates the Thomas Jefferson National Accelerator Facility for the DOE, Office of Science, Office of Nuclear Physics under Contract No. DE-AC05-06OR23177.

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