New measurements of the EMC effect in very light nuclei
J. Seely, A. Daniel, D. Gaskell, J. Arrington, N. Fomin, P. Solvignon,, R. Asaturyan, F. Benmokhtar, W. Boeglin, B. Boillat, P. Bosted, A. Bruell, M., H. S. Bukhari, M. E. Christy, B. Clasie, S. Connell, M. Dalton, D. Day, J., Dunne, D. Dutta, L. El Fassi, R. Ent, H. Fenker
TL;DR
This paper presents new precise measurements of the EMC effect in very light nuclei, revealing that the nuclear dependence of quark distributions may depend on local nuclear environment rather than simple A or density dependence.
Contribution
First measurement of the EMC effect in 3He at large x and improved data for 4He, challenging previous models based on A or density dependence.
Findings
Data do not support A-dependent fits
Results suggest local nuclear environment influences quark distributions
Provides new insights into nuclear structure at quark level
Abstract
New Jefferson Lab data are presented on the nuclear dependence of the inclusive cross section from 2H, 3He, 4He, 9Be and 12C for 0.3<x<0.9, Q^2 approximately 3-6 GeV^2. These data represent the first measurement of the EMC effect for 3He at large x and a significant improvement for 4He. The data do not support previous A-dependent or density-dependent fits to the EMC effect and suggest that the nuclear dependence of the quark distributions may depend on the local nuclear environment.
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